CN108645962B

CN108645962B - Pressure-stabilizing type acid burette based on pressure transmission U-shaped pipe

Info

Publication number: CN108645962B
Application number: CN201810743388.2A
Authority: CN
Inventors: 林继; 于浩; 张维维
Original assignee: Hohai University HHU
Current assignee: Hohai University HHU
Priority date: 2018-07-09
Filing date: 2018-07-09
Publication date: 2021-02-12
Anticipated expiration: 2038-07-09
Also published as: CN108645962A

Abstract

The invention discloses a pressure-stabilizing acid burette based on a pressure-transmitting U-shaped pipe, which comprises a pressure-stabilizing mechanism, a titration mechanism and a supporting mechanism, wherein the pressure-stabilizing mechanism and the titration mechanism are fixedly connected with the supporting mechanism, the pressure-stabilizing mechanism is communicated with the titration mechanism, the pressure-stabilizing mechanism comprises a U-shaped pipe (2) and a pressurizing mechanism, the titration mechanism comprises a connecting pipe (12) and a burette (7), the U-shaped pipe (2) is communicated with the titration pipe (7) through the connecting pipe (12), pressurizing liquid is injected into the U-shaped pipe (2) to enable the left end of the U-shaped pipe (2) to be isolated from the right end of the U-shaped pipe (2), and the pressurizing mechanism is arranged at the right end of the U-shaped pipe (2) or on the connecting pipe (12). The invention combines the titration part and the pressure stabilizing part together to ensure that the pressure generated by the pressurized liquid tends to be constant, so that the titration speed also tends to be stable, the titration precision of the burette is improved, and the experiment precision is enhanced.

Description

Pressure-stabilizing type acid burette based on pressure transmission U-shaped pipe

Technical Field

The invention relates to a pressure-stabilizing acid burette based on a pressure-transmitting U-shaped pipe, belonging to the technical field of pressure-stabilizing acid burettes.

Background

In chemical experiments, acid burettes are often used to drop acidic or strongly oxidizing solutions at a specified rate, such as for acid-base neutralization titration experiments. With a common acid burette, as the test progresses, the solution in the burette decreases, the downward pressure of the solution in the burette at the burette nozzle becomes less, and the titration rate slows down. Particularly, in the end period of titration, the amount of solution in the burette is very small, and the downward pressure generated at the burette nozzle is nearly equal to the atmospheric pressure, so that liquid drops cannot drop, and the titration rate is not uniform in the whole test process. For some tests with higher requirements on reaction time, the accuracy influence is larger.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a pressure-stabilizing type acid burette based on a pressure-transmitting U-shaped pipe, which can stabilize the hydraulic pressure at a burette nozzle in the experimental process, has stable titration speed and greatly improves the titration precision.

In order to achieve the purpose, the invention provides a pressure-stabilizing acid burette based on a pressure-transmitting U-shaped pipe, which comprises a pressure-stabilizing mechanism, a titration mechanism and a supporting mechanism, wherein the pressure-stabilizing mechanism and the titration mechanism are fixedly connected with the supporting mechanism, the pressure-stabilizing mechanism is communicated with the titration mechanism, the pressure-stabilizing mechanism comprises a U-shaped pipe and a pressurizing mechanism, the titration mechanism comprises a connecting pipe and a burette, the U-shaped pipe is communicated with the titration pipe through the connecting pipe, pressurizing liquid is injected into the U-shaped pipe to enable the left end of the U-shaped pipe to be isolated from the right end of the U-shaped pipe, and the pressurizing mechanism is arranged at the right end of the U-shaped pipe or on the connecting pipe.

Preferably, the pressurising mechanism is a pressurised ball or a pump.

Preferably, the pressure stabilizing mechanism comprises a spherical bottle, the lower end of the spherical bottle is fixedly connected with the left end of the U-shaped pipe, the upper end of the spherical bottle is open, and the right end of the U-shaped pipe is fixedly connected with the left end of the connecting pipe in a sealing manner.

Preferably, the pressure stabilizing mechanism comprises a pneumatic valve, and the pneumatic valve is mounted on the right end of the connecting pipe.

Preferentially, titration mechanism is including titrating the valve, buret upper end intercommunication the connecting pipe middle-end, the buret titrate the installation of mouthpiece top the titration valve, pressurization mechanism installs the connecting pipe middle-end is last.

Preferably, the supporting mechanism comprises two iron stand tables and two iron clamps, two the iron clamps clamp the U-shaped pipe with the buret, two the iron clamps are one of fixed connection respectively the iron stand tables.

Preferably, the pressurizing liquid is a solvent corresponding to the titration solution in the burette.

Preferably, the pressure ball is a PVC hand-pinch pressure ball.

Preferably, the pneumatic valve is a disc handle valve VA type, and the titration valve is an A-grade white acid glass piston.

The invention achieves the following beneficial effects:

the invention provides a pressure-stabilizing acid burette based on a pressure-transmitting U-shaped pipe. Compared with the traditional common acid burette, the burette of the invention combines the titration part and the pressure stabilizing part together, the hydraulic pressure at the burette nozzle is equal to the sum of the pressure generated by the dead weight of the pressurized liquid and the pressure generated by the dead weight of the titration liquid, and the pressure generated by the pressurized liquid is kept to be constant and invariable, so that the hydraulic pressure at the burette nozzle is still larger than the external atmospheric pressure at the end of titration, the titration liquid is ensured to drip smoothly, and the larger the pressure generated by the dead weight of the pressurized liquid is, the smaller the influence of the titration liquid on the hydraulic pressure at the burette nozzle is; the less the remaining titration liquid, the less the influence on the hydraulic pressure at the titration nozzle. Therefore, the hydraulic pressure at the titration nozzle tends to be stable in the test process, the titration speed also tends to be stable, the titration precision of the burette is improved, and the test precision is enhanced.

Drawings

FIG. 1 is a block diagram of the present invention in operation;

FIG. 2 is a schematic view of a U-shaped tube in an initial state of the invention.

Reference is made to the attached drawings, 1-balloon; 2-a U-shaped tube; 3-applying the upper liquid level of the liquid; 4-liquid level under the pressure liquid; 5-a pressurized ball; 6-pneumatic valve; 7-burette; 8-titration valve; 9-titration nozzle; 10-iron stand table; 11-iron clamp; 12-connecting the tube.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

The utility model provides a steady voltage formula acid buret based on biography pressure U type pipe, includes steady voltage mechanism, titration outfit for a journey and supporting mechanism, steady voltage mechanism and titration outfit for a journey fixed connection supporting mechanism, steady voltage mechanism intercommunication titration outfit for a journey, steady voltage mechanism includes U-shaped pipe 2 and loading system, titration outfit for a journey 12 and buret 7, U-shaped pipe 2 passes through even pipe 12 intercommunication buret 7, it makes to inject pressure liquid into U-shaped pipe 2 the 2 left ends of U-shaped pipe keep apart the right-hand member of U-shaped pipe 2, loading system installs the right-hand member of U-shaped pipe 2 or on the even pipe 12.

Further, the pressurizing mechanism is a pressurizing ball 5 or an inflator.

Further, steady voltage mechanism includes

spherical bottle

1, 1 lower extreme fixed connection of spherical bottle 2 left ends of U-shaped pipe, 1 upper end opening of spherical bottle, 2 right-hand members of U-shaped pipe sealed fixed connection the 12 left ends of connecting pipe.

Further, the pressure stabilizing mechanism comprises a pneumatic valve 6, and the pneumatic valve 6 is installed at the right end of the connecting pipe 12.

Further, titration mechanism includes titration valve 8, buret 7 upper end intercommunication 12 middle-ends in the connecting pipe, titration mouthpiece 9 top installation of buret 7 titration valve 8, pressurization mechanism installs on 12 middle-ends in the connecting pipe.

Further, supporting mechanism includes two iron stand platforms 10 and two iron clamps 11, two iron clamp 11 is cliied respectively the U-shaped pipe 2 with buret 7, two iron clamp 11 is one of fixed connection respectively iron stand platform 10.

Further, the pressurizing liquid is a solvent corresponding to the titration solution in the burette (7), for example, if the burette (7) is water, the pressurizing liquid is also water.

Further, the pressurizing ball 5 is a PVC hand-pinch pressurizing ball. The inflator is J02008 in model number.

Further, the pneumatic valve 6 is a disc handle valve (such as a disc handle valve VA type), and the titration valve 8 is an A-grade white acid glass piston.

The working principle of the invention is as follows:

after a series of chemical experiment pretreatment such as washing, checking air tightness, detecting leakage and the like, the following operations are carried out:

first, the pneumatic valve 6 is opened and the titration valve 8 is closed. Adding solution required by the test into the titration tube body 7 at the liquid injection port of the air pressure valve 6, slowly opening the titration valve 8 to enable the titration tube mouth 9 to be filled with the solution, closing the titration valve 8, and starting the titration tube body again when waiting for the test to start.

Then, the pressurizing liquid is injected into the U-shaped tube 2 through the upper end opening of the spherical bottle 1. The kind of the pressurizing liquid is determined according to the test requirements such as liquid density, volatility, and avoidance of mutual reaction of the pressurizing liquid vapor and the titration liquid vapor. The volume of pressurizing liquid is determined by the test operator based on the titration volume. Before pressurization, according to the principle of a communicating vessel, the left and right liquid levels of the pressurized liquid column are on the same horizontal line, as shown in fig. 2.

Next, the pneumatic valve 6 is closed, and a closed space is formed inside the apparatus.

The inside of the apparatus is pressurized by the pressurizing ball 5. The pressurizing ball 5 is characterized in that air is injected into the device when being pressed and air is sucked from the outside of the device when being released without lowering the air pressure in the device. The air in the device does not actively escape through the pressurized ball 5.

As the air pressure in the U-tube 2 increases, the two levels of the pressurized liquid begin to have a height difference, eventually reaching the effect of the upper level 3 and the lower level 4 in fig. 1. And according to the practical situation of the test, the scales of the U-shaped pipe are referred, so that the lower liquid level 4 of the pressurizing liquid is still not lower than the straight pipe part on the left side of the U-shaped pipe at the later stage of the titration, namely, the pressurizing liquid does not enter the circular arc section, and the air pressure in the U-shaped pipe 2 is ensured to be constantly equal to the pressure generated by the gravity of the pressurizing liquid.

After the height of the pressurizing liquid is adjusted, the titration valve 8 is slowly opened, and the titration speed is adjusted as required.

During the test, according to the Pascal law, the hydraulic pressure at the titration nozzle 9 is equal to the sum of the pressure generated by the self weight of the pressurizing liquid and the pressure generated by the self weight of the titration liquid. Although the hydraulic pressure at the titration nozzle 9 was slightly reduced by the reduction of the titration liquid throughout the test, the pressure generated by the pressurizing liquid was constant. Therefore, even at the end of titration, the hydraulic pressure at the titration nozzle 9 is still greater than the external atmospheric pressure, and the titration liquid is ensured to drop smoothly. And the larger the pressure intensity generated by the self weight of the pressurizing liquid is, the smaller the influence of the titration liquid on the hydraulic pressure at the titration nozzle 9 is; the less the remaining titration liquid, the less the influence on the hydraulic pressure at the titration nozzle 9. It can be approximated that the hydraulic pressure at the titration nozzle 9 tends to be stable during the test, and the titration speed also tends to be stable.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A pressure-stabilizing type acid burette based on a pressure-transmitting U-shaped pipe is characterized by comprising a pressure stabilizing mechanism, a titration mechanism and a supporting mechanism, wherein the pressure stabilizing mechanism and the titration mechanism are fixedly connected with the supporting mechanism, the pressure stabilizing mechanism is communicated with the titration mechanism, the pressure stabilizing mechanism comprises a U-shaped pipe (2) and a pressurizing mechanism, the titration mechanism comprises a connecting pipe (12) and a burette (7), the U-shaped pipe (2) is communicated with the titration pipe (7) through the connecting pipe (12), pressurizing liquid is injected into the U-shaped pipe (2) to enable the left end of the U-shaped pipe (2) to be isolated from the right end of the U-shaped pipe (2), and the pressurizing mechanism is installed at the right end of the U-shaped pipe (2) or on the connecting pipe (12);

the pressure stabilizing mechanism comprises a spherical bottle (1), the lower end of the spherical bottle (1) is fixedly connected with the left end of the U-shaped pipe (2), the upper end of the spherical bottle (1) is open, and the right end of the U-shaped pipe (2) is fixedly connected with the left end of the connecting pipe (12) in a sealing manner;

the pressure stabilizing mechanism comprises a pneumatic valve (6), and the pneumatic valve (6) is arranged at the right end of the connecting pipe (12);

the pressurizing mechanism is a pressurizing ball (5) or an inflator.

2. A pressure stabilizing type acid burette based on a pressure transmission U-shaped pipe according to claim 1, wherein the titration mechanism comprises a titration valve (8), the upper end of the burette (7) is communicated with the middle end of the connecting pipe (12), the titration valve (8) is arranged above a titration pipe nozzle (9) of the burette (7), and the pressurizing mechanism is arranged on the middle end of the connecting pipe (12).

3. A pressure-stabilizing acid burette based on a pressure-transmitting U-shaped tube according to claim 1, characterized in that the supporting mechanism comprises two iron stand platforms (10) and two iron clamps (11), the two iron clamps (11) respectively clamp the U-shaped tube (2) and the burette (7), and the two iron clamps (11) are respectively fixedly connected with one iron stand platform (10).

4. A pressure stabilised acid burette based on a pressure transmitting U-tube according to claim 1 wherein the pressure applying liquid is a solvent corresponding to the titrant solution in the burette (7).

5. A pressure stabilized acid burette based on a pressure transmitting U-tube according to claim 1, wherein the pressurizing ball (5) is a PVC hand-pinched pressurizing ball.

6. The pressure-stabilizing type acid burette based on the pressure-transmitting U-shaped pipe as claimed in claim 2, wherein the pneumatic valve (6) is a disc handle valve VA type, and the titration valve (8) is an A-grade white acid glass piston.