Automatic calorimeter for caloric analysis of sample

Abstract

The invention discloses an automatic calorimeter for caloric analysis of a sample, comprising an outer barrel, an inner barrel and an oxygen bomb; the oxygen bomb is disposed in the inner barrel which is arranged in the outer barrel, a water supply stirring mechanism is arranged outside the outer barrel for supplying water to the inner barrel and stirring, the water supply stirring mechanism comprises a water supply chamber and a magnetic stirring assembly, one end of the water supply chamber is provided with a water inlet for communication with an external water supply apparatus, and the other end of the water supply chamber is provided with a water outlet for communicating with the inner barrel to supply water; the magnetic stirring assembly comprises stirring blades arranged in the inner barrel, a magnetic transmission part arranged in the water supply chamber and a magnetic drive part arranged outside the water supply chamber, the magnetic drive part cooperates with the magnetic transmission part to drive the magnetic transmission part to rotate, and the magnetic transmission part cooperates with the stirring blades to drive the stirring blades to move in sync for stirring. The calorimeter of the invention has the advantages of simple and compact structure, good stirring effect, high volume fixing precision and high test and analysis precision.

Description

technical field [0001] The invention mainly relates to the field of sample analysis instruments, in particular to an automatic calorimeter used for calorific value analysis of samples. Background technique [0002] For the laboratory analysis of material (such as ore, coal) samples, each country has mandatory standards, which must be followed. For example, taking the analysis of coal samples as an example, the principle of the sample analysis process is to conduct relevant analysis on the samples that meet the requirements without destroying the representativeness of the samples. The accuracy of the analysis, so that the test results can reflect the characteristics of the sample most truly. [0003] In the laboratory analysis of material (such as ore, coal) samples, it is often necessary to use a calorimeter to analyze the calorific value of the sample. Existing calorimeters often have the following technical problems: [0004] 1. The stirring effect of the existing calor...

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Problems solved by technology

[0004] 1. The stirring effect of the existing calorimeter is not good

Part of the inner barrel stirring device is placed on the top, and the inner barrel is stirred from the top, but this stirring method has strict requirements on the straightness of the shaft and affects the arrangement of the upper oxygen bomb; some calorimeters place the inner barrel stirring device on the bottom, but this The bottom needs to be rotated and sealed. The rotating seal is prone to water leakage. At the same time, due to the change of friction of the rotating sealing ring, the stirring effect is different, which affects the test accuracy; and the stirring blades at the bottom of some calorimeters are prone to deflection during high-speed stirring. Instability, which directly affects the uniform mixing requirements for the test water in the inner bucket, which makes the difference in the heat of the test water and also affects the test accuracy.

[0005] 2. The inner barrel of the existing calorimeter cannot be directly constant volume, or the volume constant is not accurate, which affects the test accuracy

The existing fixed-volume constant-vessel structure is relatively complex, and the instrument needs to design a large-volume constant-vessel, and the flow path is also relatively complicated. Before the experimental waterway enters the inner barrel, a special control system is required to control the entry into the constant-vessel.

[0006] 3. The water in the inner barrel of the existing calorimeter needs to be discharged after the test. The test water in the inner barrel of some calorimeters and the test water in the outer barrel are mixed and discharged, causing cross contamination; Seriously affect the accuracy and pollution of the next constant volume; there are residues in the inner bucket of water after the test, if the residues cannot be discharged in time, the residues will accumulate, which will affect the test results of later samples

[0007] 4. The oxygen bomb in the inner barrel of the existing calorimeter generally adopts the method of directly compressing the sealing ring while tightening the oxygen bomb cover. When the tightening force of the operator is inconsistent each time, it will cause the oxygen bomb cover to be screwed in. The height is inconsistent, which makes the overall volume of the oxygen bomb inconsistent, which in turn affects the constant volume of the inner barrel, and the inaccurate constant volume affects the test accuracy

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