CN200995141Y - Dropper - Google Patents

Abstract

A burette, comprising a tube body (1) and a tube head (2). The utility model is characterized in that the tube head (2) is a piston (21), the upper end of the piston (21) is provided with a pressing head (211), the lower end is provided with an anti-loosen retaining ring (212) which is embedded into the tube body (1), a spring (213) is sleeved on the outer edge of the piston (21) between the pressing head (211) and the anti-loosen retaining ring (212).

Description

A kind of dropper

Technical field

The utility model relates to a kind of chemical apparatuses, specifically a kind of liquid dropper.

Background technology

The glue head dropper of the frequent use in laboratory at present, the glue head part of dropper is to adopt rubber pocket to make, and uses for a long time, and rubber pocket can be subjected to the influence of environment such as acid and alkali corrosion and high temperature, aging phenomenon occurs, thereby influence the accurate drop of solution amount and the service life of reducing dropper.

The utility model content

The technical problems to be solved in the utility model is to provide a kind of above-mentioned deficiency that can avoid existing dropper, has the novel dropper than the long life; Its technical problem to be solved can be implemented by the following technical programs.

A kind of dropper comprises body and tube head, and described tube head is a piston, and the upper end of piston is provided with presses pressure head, and the lower end is provided with anti-the shake off snap ring of inlay card in body, presses pressure head and prevents that the piston outer rim of shaking off between snap ring is arranged with spring.

Adopt the dropper of this technical scheme, substituted the glue head of traditional dropper, thereby avoided the aging of glue head, improved the service life of dropper and the accuracy of quantitative titration with the piston type tube head.

Description of drawings

Below in conjunction with accompanying drawing the specific embodiment of the present utility model being done one describes in detail.

Fig. 1 is a structural representation of the present utility model.

Among the figure: 1, body 2, tube head

21, piston 211, press pressure head 212, snap ring 213, spring

The specific embodiment

Dropper as shown in the figure, comprise body 1 and based on the tube head 2 of piston 21, the upper end of piston 21 is provided with presses pressure head 211, and the lower end is provided with anti-the shake off snap ring 212 of inlay card in body 1, presses pressure head 211 and prevents that piston 21 outer rims of shaking off 212 of snap rings are arranged with spring 213.

During use, only need by lower piston 21 upper ends press pressure head 211, the spring 213 that is critical impels dropper to suck liquid by the effect that produces a restoring force, presses and presses pressure head 211, the amount of liquid that drop needs.

This dropper is improved to the piston type dropper with traditional rubber dropper, thereby has avoided the aging adverse effect that produces owing to rubber bladder, has also increased the service life of dropper simultaneously.

Claims (1)

1, a kind of dropper, comprise body (1) and tube head (2), it is characterized in that: described tube head (2) is a piston (21), the upper end of piston (21) is provided with presses pressure head (211), the lower end is provided with anti-the shake off snap ring (212) of inlay card in body (2), presses pressure head (211) and prevents that piston (21) outer rim of shaking off between snap ring (212) is arranged with spring (213).

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