Sealed feed device for detecting acidity of sulfur hexafluoride gas

Abstract

The invention discloses a sealed feed device for detecting the acidity of a sulfur hexafluoride gas. The device comprises a solution bottle body, wherein a liquid storage space is formed inside the solution bottle body; the solution bottle body is further provided with a multifunctional piston structure which comprises a piston, a connecting rod, a transverse rod and a handle; a liquid inlet branch pipe, a liquid outlet branch pipe and a main pipe are arranged in the piston structure; a liquid inlet check valve is arranged on the liquid inlet branch pipe, and is used for sealing the liquid inlet branch pipe; a liquid outlet check valve is arranged on the liquid outlet branch pipe, and is used for sealing the liquid outlet branch pipe; the lower surface of the transverse rod is connected with one end of an extension spring; and the transverse rod is used for driving the piston to generate permanent pressure to the solution under the piston. The sealed feed device has the advantages of simply switching between an air mixed mode and a non-air mixed mode and ensuring that the concentration of a sodium hydroxide solution stored in the device is not affected by the external environment.

Description

technical field [0001] The invention belongs to the technical field of gas acidity detection devices, in particular to a sealed sampling device for detection of sulfur hexafluoride gas acidity. Background technique [0002] The concentration of sodium hydroxide solution used for acidity detection of sulfur hexafluoride gas is a fixed concentration standard solution. When the instrument is running, a certain amount of solution will be drawn from the sodium hydroxide solution bottle to participate in the titration detection of the acidity of sulfur hexafluoride gas. The value directly affects the accuracy of the detection results. [0003] In the past, the sodium hydroxide solution bottle used to detect the acidity of sulfur hexafluoride gas was a conventional glass reagent bottle. When pumping liquid, only a tube was inserted into the bottle. There was neither a filter device nor a closed environment to extract the solution. It is easy to cause the following consequences: ...

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Problems solved by technology

[0004] 1. The particulate impurities in the solution in the bottle are drawn into the instrument with the suction pipe to block the valve;

[0005] 2. Acid gases such as carbon dioxide and sulfur dioxide in the air are easy to react with the sodium hydroxide solution when the liquid is pumped open, resulting in a lower concentration of the solution, thus affecting the test results

[0006] However, in the test, sometimes it is desired to compare the difference between the reaction of sodium hydroxide solution mixed with air and without air. For the test of this demand, two sets of devices are generally required. However, if two sets of devices are used, due to The sodium hydroxide solution will be distributed into the two devices. After a certain period of time, there is no way to ensure that the concentration of the sodium hydroxide solution in the two devices is the same, which makes this comparison test inaccurate.

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