CN204613173U - A kind of device of titration operation of holding concurrently to level meter buret automatic liquid-feeding - Google Patents

Abstract

The utility model provides a device for automatically adding liquid to a liquid measuring tube and performing titration operation, which is mainly composed of a small oil-free silent air pump, a liquid holding bottle, a liquid pressing tube and a graduated measuring tube. Use the compressed air connecting pipe (3) to connect the small oil-free silent air pump (1) with the liquid holding bottle (2), and press the liquid used for measurement and analysis into the graduated metering tube (11) through the pressing tube (9). Close the air pump (1) when the liquid is filled up to the upper scale of the metering tube, and open the air pressure balance control valve (5) so that the liquid that is pressed into the tube (9) by the liquid flows back into the holding bottle (2). Open the drain cock (10) to discharge the required amount of liquid in the measuring bottle when performing the measurement operation. ) is connected, so that the liquid in the graduated metering tube (11) flows back into the holding bottle (2).

Description

A device for automatic liquid addition and titration operation to liquid metering tube

1. Technical field

The utility model relates to laboratory test and analysis equipment, in particular to a device for automatically adding colored or corrosive liquid to a metering tube and performing titration operations.

2. Background technology

When analyzing and determining the adsorption or decolorization performance index of solid samples or titrating the concentration of liquid samples, the volume of the measuring agent consumed must be accurately measured. For example, when measuring the methylene blue adsorption capacity of the adsorbent, it is necessary to accurately measure and add it to the sample to be tested. The volume of the methylene blue solution is usually measured with a burette marked with a volume scale. However, the methylene blue solution is a blue liquid, and the liquid may flow to the burette during the process of adding liquid to the burette. The measurement scale cannot be seen clearly from the outside; another example is when titrating the concentration of the liquid to be tested, the titrant may be a corrosive or toxic liquid, and the liquid may flow onto people’s fingers during the process of adding the titrant to the burette and cause harm. At present, the commonly used method of adding liquid is to press the required liquid into the graduated metering tube by manually pressing the double-connected ball made of rubber, which is very troublesome, and the rubber-made double-connected ball is easy to age and crack. Air leaks, unable to press the liquid for measurement into the scale metering tube, and an automatic liquid adding device is very much needed. According to this situation, the utility model has invented a device for automatically adding liquid to the liquid metering tube and performing titration operation .

3. Contents of utility model

The utility model provides a device for automatic liquid addition and titration operation to the liquid metering tube, which can automatically add liquid and discharge liquid to the metering tube for metering, and is mainly composed of a small oil-free silent air pump, a liquid holding bottle, a liquid pressing tube and a scale The metering tube is composed of a small oil-free silent air pump (1), a liquid holding bottle (2), a compressed air connection (3), a compressed air interface (4), and an air pressure balance control valve (5) as shown in Figure 1. ), frosted bottle mouth (6), frosted bottle mouth stopper (7), bottle return liquid inflow pipe (8), liquid pressing into pipe (9), draining cock (10) and scale measuring tube (11). The scale metering tube (11) is made into one with the frosted bottle mouth stopper (7) and is fixed on the frosted bottle mouth (6) by frosting cooperation. Connect the small oil-free silent air pump (1) with the liquid holding bottle (2) with the connecting pipe (3) for compressed air. Use compressed air to press the liquid used for determination and analysis into the graduated metering tube (11) through the press-in tube (9), when the liquid is filled to the upper scale of the metering tube, turn off the air pump (1), and open the air pressure balance control valve (5) To make the liquid pressed into the tube (9) flow back into the holding bottle (2). Open the drain cock (10) to discharge the required amount of liquid into the measuring bottle when performing the measurement operation. ) is connected, so that the liquid in the graduated metering tube (11) flows back into the holding bottle (2). The device for automatic liquid addition and titration operation to the liquid metering tube described in the utility model is all made of transparent glass except for the small oil-free silent air pump (1) and the compressed air connecting pipe (3).

4. Description of drawings

Accompanying drawing 1 is the vertical sectional view of the device of automatic liquid addition and titration operation to the liquid metering tube described in the utility model, (1) is a small-sized oil-free silent air pump; (2) is a liquid holding bottle; (3) is Compressed air connection; (4) is the compressed air interface; (5) is the air pressure balance control valve; (6) is the frosted bottle mouth; (7) is the frosted bottle mouth plug; (8) is the return bottle liquid inflow pipe; (9) ) is a liquid pressure pipe; (10) is a liquid discharge cock; (11) is a scale metering tube.

Accompanying drawing 2 is the longitudinal section structure diagram of drain cock (10) in Fig. 1, and (12) is to flow to the drain hole of analysis bottle; (13) is to return the liquid in the graduated metering tube to the holding bottle drain hole.

5. Specific implementation

In conjunction with Figure 1, the specific operation process of a device for automatically adding liquid to the liquid metering tube and titrating operation of the present invention is described: remove the frosted bottle mouth plug (7) from the frosted bottle mouth (6), and put the prepared Pour the solution for measurement into the holding bottle (2) for later use. When measuring, just turn on the small oil-free silent air pump (1), press the air into the holding bottle, close the air pressure balance control valve (5), and let the solution pass through gradually. The liquid press-in tube (9) flows into the graduated metering tube (11) until the liquid level slightly exceeds the full scale, then close the drain cock (10) and turn off the air pump (1), open the air pressure balance control valve (5) to make the press-in tube The liquid in (9) flows back into the holding bottle (2). Then drain the excess liquid through the discharge hole (12) of the discharge cock (10) until the liquid level reaches 0 scale and then carry out the measurement and measurement of the discharge, until the required amount of liquid is released or the end of the titration is reached, then the discharge cock is closed (10). By analogy, the operations of adding liquid and taking quantitative liquid can be performed repeatedly by repeating the above operations. When the analysis and determination work will be finished, as long as the remaining liquid in the scale measuring tube (11) flows into the holding bottle by the liquid discharge hole (13) of the liquid discharge cock (10).

Claims (1)

1. the device of a titration operation of holding concurrently to level meter buret automatic liquid-feeding, it is characterized in that: this device by small-sized without oily quiet air pump (1), liquid holding bottle (2), pressurized air adapter (3), compressed air interface (4), air pressure balance controls valve (5), frosted bottleneck (6), frosted bottle plug (7), return bottle liquid inflow pipe (8), liquid press-in pipe (9), tapping cock (10) and calibration gauge buret (11) formed, calibration gauge buret (11) and frosted bottle plug (7) are made one and are coordinated by frosted and be fixed on frosted bottleneck (6).