Concentration device for water bath nitrogen blowing instrument

Abstract

The utility model relates to a concentration device for a water bath nitrogen blowing instrument, which comprises a concentration test tube and is characterized in that a test tube cover is arranged at the orifice of the concentration test tube, a nitrogen inlet and a gas outlet are arranged on the test tube cover, and a sealing rubber ring is arranged at the top of the nitrogen inlet. A through hole tightly attached to the nitrogen blowing needle is formed in the inner ring of the sealing rubber ring, the gas outlet is connected with a gas inlet of a gas one-way valve through a gas guide pipe, and a gas outlet of the gas one-way valve is connected with a waste gas treatment device through a gas guide pipe. The gas one-way valve is a pressure control valve. The nitrogen blowing device has the advantages that waste gas generated by nitrogen blowing can be isolated from an operator, the health of the operator is protected, and meanwhile, the device can also prevent external air and water from entering the concentration test tube to pollute a sample.

Description

Technical Field

[0001] The utility model relates to a concentration device for a water bath nitrogen blowing instrument. Background Art

[0002] A water bath nitrogen blowing instrument is a commonly used laboratory device. Its working principle is to heat a sample concentration test tube through a water bath, and at the same time use nitrogen to purge the surface of the sample in the sample concentration test tube, so as to accelerate the evaporation of the solvent and achieve the purpose of concentrating the sample. At present, the sample concentration test tube is designed with an open mouth. When nitrogen blowing is performed on the sample, the waste gas generated directly enters the air without treatment, affecting the health of the operator. At the same time, the water vapor generated by the water bath heating is easily condensed and drips into the sample concentration test tube to contaminate the sample, affecting the measurement result. It is urgent to improve the current water bath nitrogen blowing instrument. Summary of the Invention

[0003] The purpose of the utility model is to overcome the above problems existing in the prior art and provide a concentration device for a water bath nitrogen blowing instrument. The technical solution provided by the utility model is as follows: A concentration device for a water bath nitrogen blowing instrument includes a concentration test tube, and is characterized in that: a test tube cover is provided at the tube orifice of the concentration test tube, a nitrogen inlet and a gas outlet are opened on the test tube cover, a sealing rubber circle is provided at the top of the nitrogen inlet, a through hole in close fit with a nitrogen blowing needle is provided in the inner circle of the sealing rubber circle, the gas outlet is connected to an air inlet of a gas check valve through a gas conduit, and an air outlet of the gas check valve is connected to an exhaust gas treatment device through a second gas conduit. The gas check valve is a pressure control valve. The advantage of the utility model is that the waste gas generated by nitrogen blowing can be isolated from the operator to protect the health of the operator. At the same time, the device can also prevent external air and water from entering the inside of the concentration test tube to cause sample contamination. Brief Description of the Drawings

[0004] Figure 1 It is a structural schematic diagram of the utility model. Detailed Embodiment

[0005] The technical solution implemented by the utility model will be further described below with reference to the drawings and embodiments. The described embodiments are only a part of the embodiments of the utility model and cannot be used to limit the protection scope of the utility model.

[0006] A concentration device for a water bath nitrogen blowing instrument in the figure, including a concentration test tube 1, is characterized in that: a test tube cap 2 is arranged at the tube opening of the concentration test tube, and the test tube cap can be screwed to the tube opening of the concentration test tube by threads. A nitrogen inlet 3 and a gas outlet 4 are opened on the test tube cap. A sealing rubber circle 5 is arranged at the top of the nitrogen inlet. A through hole (not drawn in the figure) in which a nitrogen blowing needle is closely attached is arranged in the inner circle of the sealing rubber circle. The gas outlet is connected to the air inlet of a gas one-way valve 7 through a gas conduit 6. The gas one-way valve 7 can be automatically opened under a certain pressure to ensure that the gas can be discharged smoothly and automatically closed when there is no pressure to prevent the gas from flowing back. The air outlet of the gas one-way valve is connected to an exhaust gas treatment device 9 through a second gas conduit 8. The gas one-way valve is a pressure control valve.

[0007] The usage method of a concentration device for a water bath nitrogen blowing instrument of the utility model is as follows: add an appropriate amount of sample solution into the concentration test tube 1, cover and tighten the test tube cap 2, and then insert the nitrogen blowing needle of the water bath nitrogen blowing instrument into the inside of the concentration test tube 1 through the nitrogen inlet 3 to blow the surface of the sample solution. The sealing rubber circle 4 ensures the sealing performance of the nitrogen inlet 3, prevents nitrogen leakage, and at the same time prevents external air and water from entering and polluting the sample. Nitrogen flows inside the concentration test tube 1 and discharges the exhaust gas through the gas outlet 5. The exhaust gas passing through the gas one-way valve 7 only allows the exhaust gas to be discharged from the inside, prevents the gas from flowing back, and avoids cross-contamination. The exhaust gas is discharged into the air after being treated by the exhaust gas treatment device 9 to protect the health of the operator.

Claims

1. A concentrator for a water bath nitrogen blowing instrument, comprising a concentrator test tube, characterized in that: A test tube cover is provided at the tube mouth of the concentration test tube, and a nitrogen inlet and a gas outlet are opened on the test tube cover. A sealing rubber circle is provided on the top of the nitrogen inlet, and a through hole tightly fitted by the nitrogen blowing needle is provided on the inner circle of the sealing rubber circle. The gas outlet is connected to the gas inlet of a gas one-way valve by a gas conduit, and the gas outlet of the gas one-way valve is connected to the exhaust gas treatment device by a second gas conduit.

2. A water bath nitrogen blowing instrument concentrator according to claim 1, characterized in that: The gas check valve is a pressure control valve.

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