Gas mixing dilution device

Abstract

Belonging to the field of experimental device, the invention in particular relates to a gas mixing dilution device. The device comprises injection units; and each injection unit comprises a syringe and a pushing mechanism, and further comprises a syringe cap, an injection port, an injection pipe, a snap ring and a connecting sleeve. The pushing mechanism comprises a push rod in the syringe; the front end of the push rod is provided with a piston; the outer wall of the snap ring is clamped with the syringe cap, and the inner wall of the snap ring is clamped with the push rod; one end of the connecting sleeve is connected with a one-way valve I, which is connected with a reversing valve; the syringe is in sealing connection with the one-way valve I; the one-way valve is in sealing connection with the reversing valve; the piston and the syringe cooperate mutually; and the piston is provided with at least one annular groove. The dilution device using the above structure does not need constant artificial gas taking and injection, and the whole process of gas dilution is in a closed state. Because a plurality of sealing structures are arranged in the above device, the gas hardly leaks, and the preparation process of a standard curve of gas can get more accurate results.

Description

technical field [0001] The invention belongs to the field of experimental devices, in particular to a gas mixing and dilution device. Background technique [0002] For the preparation of laboratory standard gas, there is no corresponding standard method and equipment at present. Most laboratories use the method of gradual dilution with ordinary syringes. This method is to continuously take gas, pull out, and inject through the syringe To achieve the purpose of step-by-step dilution, the whole process is completed by manual operation, and the air is taken from the upper-level syringe and injected into the lower-level syringe. The two syringes are disconnected without any connection. During the gas injection process, the gas in the injection cylinder is easy to leak, and there will be a large human error, and the ordinary injection cylinder itself also has a large airtightness problem. Many factors lead to the above-mentioned method and device configuration gas standard The ...

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Problems solved by technology

[0007] At present, the common syringe pistons are mostly made of polyethylene or polypropylene. Low-density polyethylene has good flexibility, but its hardness is poor and easy to deform; high-density polyethylene has excellent tensile strength, tensile modulus, and hardness. It is superior to low-density polyethylene, but its impact strength is worse than that of low-density polyethylene, and the piston must have good impact strength during the process of pushing the gas forward, and it will not deform under high impact strength; the disadvantages of polypropylene Yes: it becomes brittle at low temperature, not wear-resistant, and is easy to age, and the aged piston will inevitably affect the accuracy of gas reading in the experimental operation, thus affecting the results or the production of the gas standard curve

ABS resin is also a commonly used material in plastic products. It has high strength and good toughness. The disadvantage is that its surface is too smooth. If it is used to make a piston, the friction between the piston and the injection barrel will be reduced, resulting in part of the gas from the piston and Leakage between the syringes, thus affecting the accuracy of the experimental results

There are also some other plastic materials or because of their poor acid and alkali resistance, they are easy to react with acid and alkali gases, thereby being corroded; It will decrease over time, which will also affect the accuracy of the experimental results; therefore, it is necessary to improve the above-mentioned defects to create a piston with good stability, strong pressure resistance, not easy to aging, and good sealing, so that the piston and the syringe There is a sealed connection between them without deformation, so as to ensure the accuracy of the experimental results

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