JPS598673B2 - Bellows type fluid pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a bellows-type fluid pump, and particularly to the telescopic drive of the bellows.

A conventional bellows-type fluid pump is generally constructed as shown in FIG.

In the figure, 1 is a hermetically sealed bellows container, and 2 is a drive device for expanding and contracting the bellows container 1, which is connected to the bellows container 1 by a connecting rod 3.

Reference numerals 4 and 5 denote an inlet and an outlet that communicate with the inside of the bellows container 1 via electromagnetic valves 6 and 7, and 8 a vacuum pump that evacuates the inside of the bellows container 1 via an electromagnetic valve 9.

Next, the operation of the conventional bellows-type fluid pump configured as described above will be explained.

First, the solenoid valve 7 is opened and the bellows container 1 is contracted by the drive device 2.

Next, the electromagnetic valve 7 is closed, the electromagnetic valve 9 is opened, and the gas in the bellows container 1 is exhausted by the vacuum pump 8, while the bellows container 1 is extended by the driving device 2.

After sufficiently exhausting the inside of the bellows container 1, the solenoid valve 9 is closed, the solenoid valve 6 is opened, gas is sucked in from the suction port 4 until it reaches atmospheric pressure, and the solenoid valve 6 is closed.

When the gas collected in the bellows container 1 is sent out from the discharge port 5, the electromagnetic valve 1 is opened and the bellows container 1 is contracted by the drive device 2.

By repeating this series of operations, the desired gas is transferred from the suction port 4 side to the discharge port 5 side, thereby achieving the function of a pump.

As described above, in the conventional bellows type vacuum pump, it is necessary to temporarily evacuate the inside of the bellows container 1 as described above in order to collect new gas into the bellows container 1 every time.

For this reason, in large-capacity products, drive control is difficult because a large tensile force acts on the drive device 2 when vacuum is applied, and the durability of the connection between the Perose container 1 and the drive device 2 is extremely problematic. It had drawbacks such as:

This invention has been made to solve the above-mentioned drawbacks of the conventional ones, and includes a bellows container having multiple compartments, which is enclosed in an outer container, and the pressure in at least one of the compartments and the inside of the outer container is changed. The object of the present invention is to provide a bellows-type fluid pump that is easy to control and has excellent durability by expanding and contracting a bellows container and causing fluid to be sucked and discharged in the remaining compartment due to this expansion and contraction.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

In FIG. 2, 11 is a bellows container composed of double bellows, and has first and second compartments 11a and 1lb.
has.

12 is an outer container that encloses the bellows container 11, and 13 is a flange formed at one end of the bellows container 11, which is fixed as a lid to one surface of the outer container 12 via an O-ring 14.

15.16 is connected to the first compartment 11 via a solenoid valve 17.18.
The inlet and outlet 19 communicate with the inside of the outer container 12 through a vacuum pump, which communicates directly with the second compartment 1lb, through a solenoid valve 20 with the first compartment 11a, and with a three-way solenoid valve that communicates with the inside of the outer container 12. They communicate with each other via 21.

22 is a stopper attached to the other end of the bellows container 11 to limit the amount of bellows extension.

Next, the operation of an embodiment of the present invention configured as described above will be explained.

First, the solenoid valves 17 and 18 are closed, the solenoid valve 20 is opened, and the three-way solenoid valve 21 is set to communicate between the vacuum pump 19 and the outer container 12, and then the vacuum pump 19 is operated to connect the Perose container 11 and the outer container. 12 is sufficiently evacuated and the degree of vacuum in each container 11 and 12 has increased, the solenoid valve 20 is closed and the solenoid valve 17 is opened to inject gas from the inlet 15 into the first compartment 11a of the bellows container 11. At this time, the bellows container 11 expands as the gas flows in, but the maximum amount of expansion of the bellows container 11 can be adjusted by the stopper 22.

When the pressure inside the first compartment 11a reaches almost atmospheric pressure, the solenoid valve 17 is closed and the three-way solenoid valve 21 is switched to return the inside of the outer container 12 to atmospheric pressure, and the bellows container 11 contracts. The sampled gas in the first compartment 11a is compressed, and by opening the solenoid valve 18, the sampled gas can be sent out from the discharge port 16 into the bellows container 11.

By repeating this series of operations, new gas can be transferred from the suction port 15 to the discharge port 16 each time.

Note that during this operation, the second compartment 1lb is in communication with the vacuum pump 19, so that it is always in a vacuum state while the vacuum pump 19 is operating.

As described above, in this embodiment, the second compartment 11b and the outer container 12 are evacuated to change the pressure and expand and contract the bellows container 11.As a means for changing the pressure, a hydraulic pump, compressor, or It goes without saying that the same effect can be achieved by using a high pressure gas cylinder or the like.

As described above, according to the present invention, a bellows container having multiple compartments is enclosed in an outer container, and the bellows container is expanded and contracted by changing the pressure inside at least one of the compartments and the outer container. By this expansion and contraction, fluid is sucked and discharged in the remaining compartment, thereby providing a bellows-type fluid pump that is easy to drive and has excellent durability.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the structure of an example of a conventional bellows-type fluid pump, and FIG. 2 is a schematic diagram showing the structure of an embodiment of the bellows-type fluid pump of the present invention. In the figure, 11 is a bellows container, 11a and 1lb are first and second compartments, 12 is an outer container, and 19 is a vacuum pump.

Claims (1)

[Scope of Claims] 1. A bellows container having multiple compartments, an outer container enclosing the bellows container, and a method for expanding and contracting the bellows container by changing the pressure inside at least one of the compartments and the outer container. 1. A bellows-type fluid pump, characterized in that the bellows-type fluid pump is equipped with a drive source for causing the expansion and contraction to suck and discharge a desired fluid from the remaining compartments. 2. The bellows type fluid pump according to claim 1, wherein the driving source is a vacuum pump. 3. The bellows type fluid pump according to claim 1, wherein the driving source is a hydraulic pump. 4. Claims 1 to 3, characterized in that the bellows end plate of the bellows container extends beyond the outer periphery of the bellows to form a flange, and is fixed to one surface of the outer container as a lid. A bellows-type fluid pump according to any of the above.