A precision constant burette for inspection and testing center

Abstract

The invention discloses a precision constant burette used in an inspection and detection center, comprising a burette, the burette includes a burette body and a drip tip screwed on the lower end of the burette body, the burette body and the drip tip movably arranged on the burette body A sealing ring is movably arranged at the connection of the burette, a threaded notch 1 is provided on the lower end of the burette body, and a threaded notch 2 is provided on the upper end of the drip head for use with the threaded notch 1. The sealing ring is arranged on the threaded notch 1 and the thread At the connection point of the second slot, the inside of the drip head is formed with a liquid guiding cavity and the end is provided with a liquid outlet, and the middle part of the drip head is processed and formed with a regulating tube. In the present invention, the burette is designed as a split two-section structure, the head can be replaced and used as required, and the split installation method is compared with the existing one-piece structure, which facilitates the disassembly of the head of the burette. Sub-cleaning processing, so as to ensure the accuracy of the burette inspection data.

Description

technical field [0001] The invention relates to the technical field of inspection and detection appliance accessories, in particular to a precision constant burette used in an inspection and detection center. Background technique [0002] Burette refers to the measuring device that holds the titrant solution during the titration operation. The burette is a slender glass tube with a uniform inner diameter and a scale. The lower end of the tube has a glass tip and has different volumes such as 25ml and 50ml. The burette is the main measuring device used in the titration analysis method. The marked volumes are not completely consistent, and calibration must be performed in the analysis work with high accuracy requirements. Due to the characteristics of thermal expansion and contraction of glass, the volume of the burette is different at different temperatures. During calibration, a common temperature value must be specified, and this specified temperature value is the standard...

AI Technical Summary

Problems solved by technology

[0003] However, the existing inspection burettes have the following problems during use: (1) the burette is an integrated glass container, and it is difficult to clean the small-diameter drip head by conventional cleaning with a soft brush. As a result of the one-piece design that affects the accuracy, the entire burette needs to be replaced if the position is damaged; (2) Although the method of controlling the dripping of the burette through the cock has good convenience, it is affected by the temperature. The situation of thermal expansion and contraction is likely to cause liquid leakage. The cock is installed horizontally. It is necessary to test the position of the cock with a test paper every time it is inspected. The operation is very cumbersome.

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