CN202710526U

CN202710526U - Burette

Info

Publication number: CN202710526U
Application number: CN 201220378223
Authority: CN
Inventors: 任德财; 钱镭; 赵冬梅; 魏丽娜; 赵佳莉; 李楠
Original assignee: East University of Heilongjiang
Current assignee: East University of Heilongjiang
Priority date: 2012-07-31
Filing date: 2012-07-31
Publication date: 2013-01-30
Anticipated expiration: 2022-07-31

Abstract

The utility model relates to a burette. The problems that the existing burette is difficult to control when used for the titrimetric analysis of an endpoint and easily has an error when titrating across an endpoint reading. The burette comprises a burette body and a piston and further comprises a moving sleeve, wherein secondary rule marks of a vernier caliper are arranged on the outer part of the moving sleeve in the long direction, and the moving sleeve is sheathed outside the burette body; and two shallow grooves are formed on the two sides of a middle hole of the piston along the rotating direction of the piston. The burette is used for liquid titration.

Description

A kind of buret

Technical field

The utility model relates to a kind of buret.

Background technology

Buret is that analysis of compounds forms and the common instrument of content in the chemical experiment, and the problem aspect two can appear in common buret when carrying out analyzing and testing.

The one, carry out the titrimetry terminal point with it wayward, when titration during near terminal point, need to add the standard solution of trace, carry out half operation.Because it is unskilled that the student operates, it is excessive usually to drip.The main cause of this phenomenon is that the anglec of rotation of unlatching piston is wayward, and the anglec of rotation is too little, and liquid does not flow out; The anglec of rotation is too large, and the speed that liquid flows out is too fast, and discharge is large, overstep of end point.

The 2nd, when dripping the terminal point reading, read decimal generation error owing to estimating, it is not very accurate causing timing signal concentration, affects factor of experimental result yet.

The utility model content

The purpose of this utility model is wayward when carrying out the titrimetry terminal point in order to solve present buret, and when dripping the terminal point reading, the problem of error easily occurs, and the utility model provides a kind of buret.

A kind of buret, it comprises buret and piston, it also comprises mobile sleeve pipe, the attached chi scale of the outer setting vernier caliper on the length direction of described mobile sleeve pipe, the movable sleeving pipe box is in the outside of buret; The both sides of the middle hole of described piston, open two shallow trench along the sense of rotation of piston.

The utility model has the advantage of, when the titration end-point reading, the concave meniscus of " 0 " scale mark of the attached chi of mobile jacket exterior and titration liquid in pipe is tangent, reading behind the decimal before 1 is by the data reading on the buret, and the 2nd scale mark that is coincided by buret and attached chi read behind the radix point.And common buret is only to be accurate to behind the radix point 1, avoided estimating behind the radix point error of reading, rotary-piston, the area that middle hole in the control piston and shallow trench communicate with buret, control like this flow of buret, the concave meniscus of regulating " 0 " scale mark of attached chi of mobile jacket exterior and titration liquid in pipe is tangent, also can control the flow velocity of buret simultaneously.

Description of drawings

Fig. 1 is the structural representation of a kind of buret described in the utility model.

Fig. 2 is the structural representation of the piston of a kind of buret described in the utility model.

Embodiment

Embodiment one: present embodiment is described below in conjunction with Fig. 1 and Fig. 2, a kind of buret described in the utility model, it comprises buret 1 and piston 2, it also comprises mobile sleeve pipe 3, the attached chi scale of the outer setting vernier caliper on the length direction of described mobile sleeve pipe 3, mobile sleeve pipe 3 is enclosed within the outside of buret 1; The both sides of the middle hole of described piston, open two shallow trench 4 along the sense of rotation of piston.

Embodiment two: present embodiment is to the further specifying of embodiment one described a kind of buret, and at piston 2 the different tag lines that drip speed is set, and at the knob of piston 2 standard lines is set.

Knob at piston 2 arranges standard lines, on piston 2, also write down several grooves according to different speed, drip the fast shelves of speed and drip the slow shelves of speed to show, when inside and outside graticule rotates to overlapping interval scale friction speed shelves, can select according to the experiment demand, realize dripping easily control of speed.

Embodiment three: present embodiment is that it also comprises fixed knob 5 to the further specifying of embodiment one described a kind of buret, and is used for making between mobile sleeve pipe 3 and the buret 1 keeping relative static conditions.

Embodiment four: present embodiment is further specifying embodiment three described a kind of burets, on the fixed knob 5 with screw rod, described screw rod passes the sidewall of mobile sleeve pipe 3 and is connected with the sidewall thread of mobile sleeve pipe 3, and the end of described screw rod withstands on the lateral wall of buret 1.

Vernier caliper is that common use of main scale and attached chi accurately read measurement size.According to this principle, the utility model adds a mobile sleeve pipe as attached chi in the buret outside, and the length of the scale 0.9mL of the outside of the mobile sleeve pipe of buret is divided into 10 parts at attached chi, and is fixing by fixed knob 5, forms the precise reading device.When the titration end-point reading, the concave meniscus of " 0 " scale mark of attached chi and titration liquid in pipe is tangent, with the position of the fixing mobile sleeve pipe 3 of fixed knob at buret 1, reading behind the decimal before 1 is read by the scale on the buret, and the 2nd scale mark that is coincided by buret and attached chi read behind the radix point.For example: the reading among Fig. 1 is 45.76mL.The reading of 2 significant digits can be accurately read in such design.

Rotary-piston, the area that the middle hole in the control piston and shallow trench communicate with buret is controlled the flow of buret like this, and the concave meniscus of regulating " 0 " scale mark of attached chi of mobile sleeve pipe 3 outsides and titration liquid in pipe is tangent.

Claims

1. buret, it comprises buret (1) and piston (2), it is characterized in that, it also comprises mobile sleeve pipe (3), the attached chi scale of the outer setting vernier caliper on the length direction of described mobile sleeve pipe (3), mobile sleeve pipe (3) is enclosed within the outside of buret (1); The both sides of the middle hole of described piston, open two shallow trench (4) along the sense of rotation of piston.

2. a kind of buret according to claim 1 is characterized in that, at piston (2) the different tag lines that drip speed is set, and at the knob of piston (2) standard lines is set.

3. a kind of buret according to claim 1 is characterized in that, it also comprises fixed knob (5), is used for making between mobile sleeve pipe (3) and the buret (1) keeping relative static conditions.

4. a kind of buret according to claim 3, it is characterized in that, fixed knob (5) is upper, and described screw rod passes the sidewall of mobile sleeve pipe (3) and is connected with the sidewall thread of mobile sleeve pipe (3) with screw rod, and the end of described screw rod withstands on the lateral wall of buret (1).