CN102866229A

CN102866229A - Separated type burette

Info

Publication number: CN102866229A
Application number: CN2012103515782A
Authority: CN
Inventors: 常征; 郝南明; 张铁; 李洪潮
Original assignee: WENSHAN UNIVERSITY
Current assignee: WENSHAN UNIVERSITY
Priority date: 2012-06-19
Filing date: 2012-09-21
Publication date: 2013-01-09
Anticipated expiration: 2032-09-21
Also published as: CN102866229B

Abstract

The invention relates to a separated type burette. The separated type burette consists of a burette pipe body (1) and a titrating head (2), wherein the titrating head (2) is connected to the terminal of the burette pipe body (1). According to the separated type burette, a glass piston control valve of a traditional acid burette and a rubber duct glass ball control valve of a traditional alkali burette are saved; the disadvantages that the traditional acid-base burette is easily damaged and blocked, figures of a user are pain severely because the alkali burette extrudes the glass ball for a long term and the like are conquered; and the separated type burette is simple in structure and convenient for cleaning and exchanging.

Description

The separate type buret

Technical field

The present invention relates to a kind of experimental apparatus, particularly a kind of buret.

Background technology

Make at present buret that experiment uses and be divided into two kinds of acid buret and base burets, because structure is different, two kinds of burets can not be used with, if fill alkaline solution with acid buret, time has been grown, and easily causes piston to be connected with body because of corrosion, so that by-pass valve control can not rotate; If fill acid solution with base buret, thereby then can cause the emulsion tube frequent that is corroded; In addition, in the situation that normal the use, leakage also often appears in acid buret, be coated with vaseline and stop up body, the careless landing of glass stopper is broken and is caused whole buret to scrap in washing process, and acid buret has obvious right-hand operated custom; Base buret in use can have an intense pain because long-time extruding glass bead produces finger.

Summary of the invention

The burette of the rubber catheter glass bead operation valve of the present invention by a kind of glass piston operation valve that saves traditional acid buret and base buret are provided, overcome that the classical acid alkali burette easily damages, easily stops up, base buret can be because of shortcomings such as long-time extruding glass bead produce finger to have an intense pain, and this invention is simple in structure is convenient to cleaning and replacing.

The present invention is achieved in that the separate type buret, is made of buret body, titrating head, and it is terminal that titrating head is connected to the buret body; Buret is provided with current-limiting apparatus; The titrating head end is provided with drainage needle; Current-limiting apparatus is: titrating head outer wall cover has the control cover, and titrating head is outside to have the screw thread that matches with control cover inwall, and the control cover is screwed on the titrating head by screw thread, and the opening of titrating head end can outwards open and inwardly close up; Current-limiting apparatus is: the terminal outer wall of titrating head inwall and buret body has the screw thread that matches, and titrating head is to be screwed in buret body end, the built-in cross plug of titrating head by screw thread; The cross plug is a cross bracket that is fixed in titrating head inside; Titrating head, control cover, cross plug are made by ethylene-tetrafluoroethylene copolymer or ethylene fluoride multipolymer or tetrafluoroethene.

The present invention easily cleans and changes, and is easy and simple to handle, not fragile, durable in use and with low cost.

Description of drawings:

Fig. 1: the basic structure schematic diagram of separate type buret;

Fig. 2: the structural representation of 1,2 titrating heads among the embodiment;

Fig. 3: 3,4 structure and connection diagram among the embodiment;

The structural representation of the cross plug among Fig. 4: the embodiment 3,4;

Among the figure, 1 is the buret body, and 2 is titrating head, and 3 is drainage needle, and 4 are the control cover, and 5 is screw thread, and 6 is the cross plug, and 7 is the titrating head inwall.

Specific embodiment:

1, separate type buret is made of buret body 1, titrating head 2, drainage needle 3, and titrating head 2 ends have drainage needle 3, and titrating head 2 is connected to buret body 1 end; The opening of the end of titrating head 2 can outwards open and close up, and titrating head 2 outer wall covers have control cover 4, and outside and control cover 4 inwalls of titrating head 2 have the screw thread that matches, and control cover 4 is screwed on the titrating head 2 by screw thread;

Principle is as follows: solution enters titrating head 2 from buret body 1, and then from titrating head 2, flow out, drainage needle 3 plays the effect of drainage solution, current-limiting apparatus: the opening of titrating head 2 ends can outwards open and close up, titrating head 2 outer wall covers have control cover 4 such as Fig. 2, titrating head 2 outsides and control cover 4 inwalls have the screw thread that matches, and the control cover is screwed on the titrating head by screw thread; When control cover 4 was tightened, the opening of the end of titrating head 2 drew in, and solution stops outflow by the speed of titrating head 2 outflows is slack-off until opening all closes up solution; When control cover 4 was unscrewed, the opening of titrating head 4 ends opened, and solution flow rate accelerates.

2, separate type buret is made of buret body 1, titrating head 2, and titrating head 2 is connected to buret body 1 end; The opening of the end of titrating head 2 can outwards open and close up, and titrating head 2 outer wall covers have control cover 4, and outside and control cover 4 inwalls of titrating head 2 have the screw thread that matches, and control cover 4 is screwed on the titrating head 2 by screw thread;

Its principle is as follows: with the difference of embodiment 1 be that the present embodiment does not arrange drainage needle.

3, separate type buret, consisted of by buret body 1, titrating head 2, drainage needle 3, titrating head 2 ends have drainage needle 3, titrating head 2 is connected to buret body 1 end, titrating head 2 inwalls and buret body 1 terminal outer wall have the screw thread 5 that matches, titrating head 2 is to be screwed in buret body 1 end by screw thread, and a cross plug 6 is fixed such as Fig. 3 in titrating head 2 inside; Cross plug 6 is the cross brackets on the inwall 7 that is fixed in titrating head 2, its structure such as Fig. 4;

Its principle is as follows: solution enters titrating head 2 from buret body 1, and then from titrating head 2, flow out, the effect of drainage needle is with embodiment 1, current limliting principle: along with tightening of titrating head 2, the most advanced and sophisticated leakage fluid dram part of buret body 1 is slowly near the point of crossing, cruciform center of cross plug 6, whole moving process can realize that the flow velocity of solution constantly diminishes, and last buret body 1 most advanced and sophisticated leakage fluid dram is blocked by point of crossing, cruciform center; When titrating head was unscrewed, buret body 1 tip was slowly away from the cross plug, and whole moving process can realize that the flow velocity of solution constantly becomes large.

4, separate type buret, by buret body 1, titrating head 2, consist of, titrating head 2 is connected to buret body 1 end, titrating head 2 inwalls and buret body 1 terminal outer wall have the screw thread 5 that matches, titrating head 2 is to be screwed in buret body 1 end by screw thread, and a cross plug 6 is fixed such as Fig. 3 in titrating head 2 inside; Cross plug 6 is cross brackets that are fixed in titrating head 2 inwalls 7, its structure such as Fig. 4;

Its principle is as follows: with the difference of embodiment 3 be that the present embodiment does not arrange drainage needle.

5, titrating head 2, control cover 4, cross plug 6 are made by ethylene-tetrafluoroethylene copolymer or ethylene fluoride multipolymer or tetrafluoroethene.

Claims

1. the separate type buret is characterized in that, is made of buret body (1), titrating head (2), and titrating head (2) is connected to buret body (1) end.

2. separate type buret according to claim 1 is characterized in that, buret is provided with current-limiting apparatus.

3. separate type buret according to claim 2 is characterized in that, titrating head (2) end is provided with drainage needle (3).

4. according to claim 2 or 3 described separate type burets, it is characterized in that, described current-limiting apparatus is: titrating head (2) outer wall cover has control cover (4), titrating head (2) is outside to have the screw thread that matches with control cover (4) inwall, control cover (4) is screwed on the titrating head (2) by screw thread, and the terminal opening of titrating head (2) can outwards open and inwardly close up.

5. according to claim 2 or 3 described separate type burets, it is characterized in that, described current-limiting apparatus is: titrating head (2) inwall and the terminal outer wall of buret body (1) have the screw thread (5) that matches, titrating head (2) is to be screwed in buret body (1) end, the built-in cross plug of titrating head (2) (6) by screw thread.

6. separate type buret according to claim 5 is characterized in that, described cross plug (6) is one and is fixed in the inner cross bracket of titrating head (2).

7. according to claim 1,3,6 described separate type burets, it is characterized in that, described titrating head (2), control cover (4), cross plug (6) are made by ethylene-tetrafluoroethylene copolymer or ethylene fluoride multipolymer or tetrafluoroethene.