JPH0454817Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a liquid supply device that prevents liquid dripping when the supply of liquid is stopped.

In devices that apply pressure fluid to press the liquid stored in a container and supply the liquid to a predetermined position from a thin tube connected to the container, it is necessary to stop the liquid by simply removing the pressing force caused by the pressure fluid. The liquid flows down inside the tube, causing drips, and especially when a small amount of liquid is supplied, the increase in liquid amount due to the drips becomes a problem. Therefore, various devices that do not cause dripping have been studied, but a device that has a simple structure and can reliably prevent dripping has not yet been put into practical use.

The present invention provides a device that can prevent dripping by simply adding a simple mechanism.

(Means for Solving the Problems) That is, the present invention provides an apparatus in which a thin tube for sending liquid is connected to a container for liquid storage, and a pressing force is applied to the liquid in the container to send the liquid from the thin tube. A liquid reservoir with a small diameter and a bottom is formed at the lower part of the liquid reservoir, and a pore communicating between the inside and outside is formed above the bottom, and an elastic cylinder is fitted into the liquid reservoir so as to cover the pore. The present invention provides a liquid supply device in which liquid feeding thin tubes are attached to the outer periphery of the elastic cylinder at a predetermined interval.

(Example) The configuration of the liquid supply device of the present invention will be explained based on the drawings.

Reference numeral 1 denotes a container for storing liquid, and a liquid storage part 1a having a small diameter and a bottom and a connecting part 1b to which a thin tube 2 is attached are formed at the lower part. A protrusion 1c is formed on the outer periphery of the clasp 1a to prevent the elastic cylinder 3 from slipping off when inserted, and a small hole 1d is bored above the bottom to communicate between the inside and outside. .
Furthermore, a screw 1e for connecting the thin tube 2 and a groove 1f for mounting an O-ring 5 are formed in the connecting portion 1b. The thin tube 2 has a mounting portion 2a having a screw 2e screwed onto the screw 1e of the connecting portion 1b of the container 1, a large diameter portion 2b for accommodating the elastic cylinder 3, and
It is formed with a small diameter portion 2c for sending out liquid. The material, thickness, etc. of the elastic cylinder 3 depend on the viscosity of the liquid,
It can be selected as appropriate depending on temperature, chemical resistance, etc. 5 is a lid plate having a short tube 5a, and is attached to the container 1 with a fastener 6. A pressure fluid supply pipe 8 is connected to the short pipe 5a via a valve 7.

When a liquid is supplied by the above-mentioned device, when a predetermined liquid is supplied to the container 1 and the valve 7 is opened, compressed air at a predetermined pressure is supplied into the container 1, and a pressing force acts on the liquid. Then, the liquid in the liquid reservoir 1a moves to the outer circumferential surface of the liquid reservoir 1a through the pores 1d, and spreads the elastic cylinder 3 to form a space between the outer circumferential surface of the liquid reservoir 1a and the elastic cylinder 3. Flows down into the small diameter part 2 of the thin tube 2
Sent from c. When a predetermined amount of liquid is supplied, the valve 7 is opened, and the supply of compressed air is stopped.
The elastic cylinder 3 immediately contracts and comes into close contact with the outer peripheral surface of the liquid reservoir 1a, the pore 1d is closed, and the delivery of liquid from the container 1 to the thin tube 2 is immediately stopped.

In the above-mentioned embodiment, the liquid reservoir was formed integrally with the container, but it could be molded as a single part like a thin tube.
It can also be configured to be attached to the bottom of the container.

(Effects of the invention) As described above, the present invention provides a device in which a thin tube for sending liquid is connected to a container for liquid storage, and a pressing force is applied to the liquid in the container to send the liquid from the thin tube. , a liquid reservoir having a small diameter and a bottom is formed, a pore communicating between inside and outside is formed above the bottom, an elastic cylinder is fitted into the liquid reservoir so as to cover the pore, and The following effects can be achieved by attaching liquid feeding thin tubes to the outer periphery of the elastic cylindrical body at predetermined intervals.

(1) At the same time as the supply of liquid due to the pressing force is stopped, the elastic cylinder comes into close contact with the outer peripheral surface of the liquid storage part,
Since the liquid delivery pores are closed, dripping can be prevented and accuracy can be improved in the case of supplying a small amount.

(2) It is possible to easily deal with all kinds of liquids by simply selecting and replacing the elastic cylinder according to the properties of the liquid.

(3) Since the liquid leakage prevention mechanism is formed only of the elastic cylinder, operations such as replacement and cleaning can be easily performed.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing one embodiment of the liquid supply device of the present invention. FIG. 2 is a schematic cross-sectional view showing a state when liquid flows out from the liquid storage section. 1... Container, 2... Thin tube, 3... Elastic cylinder, 4
...O-ring, 1a...liquid collecting part, 1b...connecting part, 1d...pore.

Claims (1)

[Scope of utility model registration request] In a device that connects a liquid feeding capillary to a liquid storage container and applies a pressing force to the liquid in the container to send the liquid from the capillary, a liquid storage portion having a small diameter and a bottom is formed at the lower part of the container. At the same time, a pore communicating between inside and outside is formed above the bottom, and an elastic cylinder is fitted into the liquid reservoir so as to cover the pore,
A liquid supply device characterized in that liquid feeding thin tubes are attached to the outer periphery of the elastic cylindrical body at a predetermined interval.