Precise constant burette for inspection and detection center

Abstract

The invention discloses a precise constant burette for an inspection and detection center. A burette is included. The burette comprises a burette body and a dropping liquid head arranged at a lower end of the burette body in a threaded mode. A sealing ring is movably arranged at a joint of the burette body and the dropping liquid head movably arranged on the burette body; and a first threaded notch is formed in the lower end of the burette body, a second threaded notch used in cooperation with the first threaded notch is arranged in an upper end of the dropping liquid head, the sealing ring isarranged at the joint of the first threaded notch and the second threaded notch, a liquid guide inner cavity is formed in the dropping liquid head, a liquid outlet is arranged in a tail end, and an adjusting pipe is machined and formed in the middle of the dropping liquid head. The burette is designed to be a split two-section structure, a head can be replaced for use according to needs; and compared with an existing integrated structure, the split installation mode facilitates splitting and cleaning treatment of the head of the burette, and accuracy of burette inspection data is guaranteed.

Description

technical field [0001] The invention relates to the technical field of inspection and detection equipment accessories, in particular to a precision constant burette for an inspection and detection center. Background technique [0002] A burette refers to a measuring vessel that holds a titrant solution in a titration operation. The burette is a slender glass tube with a uniform inner diameter and a scale. There is a glass tip at the lower end of the tube, with different volumes such as 25ml and 50ml. The burette is the main measuring device used in the titration analysis method. The marked volume is not exactly the same, and it must be calibrated in the analysis work that requires high accuracy. Due to the characteristics of thermal expansion and contraction of glass, the volume of the burette is different at different temperatures. When calibrating, a common temperature value must be specified, and this specified temperature value is the standard temperature. Internationa...

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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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