CN201613139U

CN201613139U - Dropping head structure of burette joint

Info

Publication number: CN201613139U
Application number: CN2009202881003U
Authority: CN
Inventors: 周桦; 马强; 王瑞杰; 宇万太
Original assignee: Institute of Applied Ecology of CAS
Current assignee: Institute of Applied Ecology of CAS
Priority date: 2009-12-16
Filing date: 2009-12-16
Publication date: 2010-10-27
Anticipated expiration: 2019-12-16

Abstract

The utility model relates to a dropping head of a burette joint, a head of a liquid-transferring gun is sheathed at a sharp nose of a burette, a through hole is arranged in the middle of the head of the liquid-transferring gun, a frustum-shaped structure is arranged at the top end, sections from the outer surface of the frustum to the table surface of the frustum at the top end are respectively arranged on two sides of the top end of the head of the liquid-transferring gun, intersection lines between the sections and the outer surface of the frustum are inferior arcs, the sections are inferior arc surfaces, and inferior arc chords which correspond to the inferior arcs on the inferior arc surfaces are positioned below the through hole. The dropping head structure can effectively improve the titration precision, reduce the experimental error and be especially suitable for micro-titration operation and semi-micro-titration operation.

Description

The emitter structure of buret joint

Technical field

The utility model relates to the water dropper of buret joint, and specifically the liquid-transfering gun at the two minor arc faces of titration tip mouth place's socket substitutes head.

Background technology

The design principle of buret is by the pressure differential of liquid drop to be discharged, and the direction by adjusting knob, and control drop flow velocity is to satisfy the purpose of titration.But along with oozing of drop, the pressure differential in the buret slowly reduces, so that influenced the volume of drop.Found through experiments, for the 10ml buret, during since 0 graduation mark titration, the volume that a dropping liquid drips is 0.045ml, and when liquid level was the 9ml graduation mark, the volume that a dropping liquid drips was 0.05ml, and only the dropping liquid error of dripping just is 10%.

The utility model content

For the droplet size that reduces to cause owing to hydraulic pressure changes, the author is with reference to No. 200720010338.0 patents, the liquid-transfering gun of the socket of buret is substituted head to be processed, design a joint that is applicable to constant and micro-semimicro buret, the drop that this joint oozes is less, and it is constant effectively to control droplet size, reduces titration error.

For achieving the above object, the technical solution adopted in the utility model is:

A kind of emitter structure of buret joint, liquid-transfering gun rifle head in the place's socket of titration tip mouth, liquid-transfering gun rifle head is that the centre has through hole, the top is the frustum structure, the both sides of described liquid-transfering gun rifle crown end are provided with by the tangent plane of frustum outer surface to top frustum table top, the intersection of described tangent plane and frustum outer surface is a minor arc, be that tangent plane is the minor arc face, the pairing minor arc string of minor arc is in the below of through hole on the minor arc face.

The sharp mouth place of described liquid-transfering gun rifle crown end is the wedge structure of two-sided minor arc; Described both sides minor arc is provided with in the face of claiming, the angle between two minor arc face tip portions is 60-120 °.

The utility model is at the alternative head of the liquid-transfering gun of the two minor arc faces of titration tip mouth place's socket.The utility model can effectively improve the titration accuracy, reduces experimental error, especially suitable trace and semimicro titration operation.

Description of drawings

Fig. 1 is existing liquid-transfering gun rifle header structure.

Fig. 2 is the emitter structure of buret joint of the present utility model.

The specific embodiment

Embodiment 1

A kind of emitter structure of buret joint, liquid-transfering gun rifle head in the place's socket of titration tip mouth, liquid-transfering gun rifle head is that the centre has through hole, the top is the frustum structure, the both sides of described liquid-transfering gun rifle crown end are provided with by the tangent plane of frustum outer surface to top frustum table top, the intersection of described tangent plane and frustum outer surface is a minor arc, be that tangent plane is the minor arc face, the pairing minor arc string of minor arc is in the below of through hole on the minor arc face; The sharp mouth place of liquid-transfering gun rifle crown end is the wedge structure of two-sided minor arc;

Described both sides minor arc is provided with in the face of claiming, the angle between two minor arc face tip portions is 60 °.

Control group: get common 10ml buret, during since 0 graduation mark titration, 10 dropping liquids that drip drip, and reading, liquid level are that 9ml 10 dropping liquids that drip equally drip, and reading repeats four times;

Experimental group: same 10ml buret, the improved pipette rifle of socket 50 μ l head (be pipette substitute head), during since 0 graduation mark titration, 10 dropping liquids that drip drip, and the number of degrees, liquid level are that 9ml 10 dropping liquids that drip equally drip, and reading, repeat four times.The results are shown in Table 1.Use improved buret water dropper, droplet size is constant, and the measurement result accuracy is higher.

The liquid volume that table 1. buret oozes

Claims

1. the emitter structure of buret joint, liquid-transfering gun rifle head in the place's socket of titration tip mouth, liquid-transfering gun rifle head is that the centre has through hole, the top is the frustum structure, it is characterized in that: the both sides of described liquid-transfering gun rifle crown end are provided with by the tangent plane of frustum outer surface to top frustum table top, the intersection of described tangent plane and frustum outer surface is a minor arc, be that tangent plane is the minor arc face, the pairing minor arc string of minor arc is in the below of through hole on the minor arc face.

2. according to the emitter structure of the described buret joint of claim 1, it is characterized in that: the sharp mouth place of described liquid-transfering gun rifle crown end is the wedge structure of two-sided minor arc.

3. according to the emitter structure of the described buret joint of claim 1, it is characterized in that: described both sides minor arc is provided with in the face of claiming, the angle between two minor arc face tip portions is 60-120 °.