Gas quantifying device and device for detecting impurity gas in oxygen

Abstract

The utility model discloses a gas quantifying device and a device for detecting foreign gas in oxygen, the gas quantifying device comprises a gas source, a gas outlet pipe of the gas source is communicated with a gas inlet of a peristaltic pump, power is supplied to the peristaltic pump through an adjustable direct-current stabilized power supply, and a gas outlet pipe of the peristaltic pump is communicated with a volume quantifying device. According to the utility model, the adjustable DC stabilized power supply can adjust the current and voltage, and can digitally display the real-time voltage and current values, and for the same batch of detection tubes, only the first current and voltage value correction needs to be completed, and the next experiment can adopt the same current and voltage value to carry out the experiment.

Description

Technical Field

[0001] The utility model relates to a gas quantitative device, in particular to a gas quantitative device and a device for detecting impurity gases in oxygen. Background Art

[0002] Medical oxygen is used for the prevention and treatment of hypoxia. It is a basic substance for maintaining life and plays an extremely important role in clinical disease treatment. The content of impurity gases in medical oxygen must pass strict inspection and quality control before it can be used clinically. The impurity gas detection items in the quality standard of oxygen in the 2020 edition of the "Chinese Pharmacopoeia" are carbon monoxide, carbon dioxide, and other gaseous oxides. The three detection methods are all detected by washing with the control tube; for carbon monoxide detection, take two colorimetric tubes A and B, add 25mL of lukewarm ammonia silver nitrate test solution to each, and after 1000mL of oxygen is passed into tube A (at a rate of 4000mL per hour), it should be clear and colorless compared with tube B; for carbon dioxide detection, take two colorimetric tubes A and B. , add 100mL of 5% barium hydroxide solution, add 1.0mL of 0.04% sodium bicarbonate to tube B, and pass 1000mL of oxygen into tube A. The turbidity shown should not be deeper than that of tube B (0.01%). For the detection of other gaseous oxidizing substances, take 100mL of freshly prepared potassium iodide starch solution (take 0.5g of potassium iodide, add 100mL of starch indicator solution to dissolve it), place it in a colorimetric tube, add 1 drop of acetic acid, and pass 2000mL of this product (at a speed of 4000m / h). L), the solution should be colorless. The above standard has been abolished. On May 22, 2022, the revised national drug standard of the State Food and Drug Administration, batch number XGB2021-061, was implemented. The standard controls the limits of three impurity gases: carbon monoxide, carbon dioxide, and water. The limit of carbon monoxide is not more than 0.0005% (mL / mL). Two detection methods are used, and one can be selected. Method (1) Take this product and measure it with a carbon monoxide gas detection tube. Method (2) Take this product and measure it with an infrared analyzer. The limit of carbon dioxide is not more than 0.03% (mL / mL). Two detection methods are used, and one can be selected. Method (1) Take this product and measure it with a carbon dioxide detection tube. Method (2) Take this product and measure it with an infrared analyzer. The moisture control limit is not more than 0.0067% (ml / ml). Method (1) Take this product and measure it with a water vapor detection tube. Method (2) Take this product and pass it into an electrolytic hygrometer and measure it according to the law.

[0003] In my country, drug testing institutions, small oxygen production enterprises, and enterprises and units that use oxygen generally do not purchase infrared analyzers and electrolytic hygrometers because they are expensive, have high maintenance costs, and require high operating personnel. Instead, they use the detection tube method to directly read the scale according to the color change to detect the content of impurity gases, and then convert it according to the actual temperature according to the instructions. This method is convenient, simple, fast, and highly sensitive. The test time and the amount of gas introduced are clearly stated in the instructions of the detection tube. For example, the carbon monoxide detection tube needs to collect 100mL of gas introduced in 4 minutes, and the color changes from pink to yellow. The carbon dioxide detection tube needs to The amount of gas collected and introduced within 2 minutes is 100mL (1.5 minutes / 50mL), and the color changes from peach to yellow. The amount of gas collected and introduced within 1 minute is 100ml, and the color changes from yellow to cyan (20℃, above 0.6mg / L), and yellow to yellow-green (20℃, less than 0.6mg / L). Because the color-developing filler of the detection tube is compact, the manual quantitative sampling syringe cannot achieve uniform sampling speed during the manual sampling process, and different experimenters have different operating techniques. Especially in the moisture determination process, when the extraction speed is too fast, the color band is significantly extended, which seriously affects the accuracy of the test results.

[0004] Chinese patent publication number CN102616723B discloses a small-scale liquid silicon tetrachloride quantitative feeding system and control method. The system comprises a nitrogen cylinder, a gas flowmeter, a silicon tetrachloride storage tank, a silicon tetrachloride buffer tank, and a peristaltic pump, connected sequentially via pipes and valves. A corresponding control method is also provided, comprising the following steps: Step 1: purging the gas system; Step 2: feeding the buffer tank; and Step 3: feeding the silicon tetrachloride system. This solution, in which the nitrogen cylinder is connected to the gas flowmeter and peristaltic pump, is only suitable for feeding systems with high gas flow rates and not for systems with low gas flow rates. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a gas quantitative device for accurately controlling the volume of gas output per unit time in view of the deficiencies in the prior art.

[0006] The utility model also provides a device for detecting impurity gases in oxygen, which propels the detected gas at a uniform speed, reduces the influence of human factors on the experiment, and increases the accuracy of the experimental results.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is: a gas quantitative device, including a gas source, the gas outlet pipe of the gas source is connected to the gas inlet of a peristaltic pump, the peristaltic pump is powered by an adjustable DC regulated power supply, and the gas outlet pipe of the peristaltic pump is connected to the volume quantitative device;

[0008] The volume quantitative device comprises a first container filled with liquid and a second container filled with liquid and having a scale, wherein the second container is inverted in the liquid in the first container, and a liquid column is formed in the second container.

[0009] The utility model adjusts the current and voltage through an adjustable DC regulated power supply, and can digitally display the real-time voltage and current values. The volume of gas output per unit time by the gas source is controlled by controlling the adjustable DC regulated power supply to adjust the current and voltage.

[0010] In a preferred embodiment of the present invention, there are no bubbles at the top of the liquid column in the second container.

[0011] The gas enters the liquid column, and the volume of air in the liquid column is the volume of the gas source output.

[0012] In a preferred embodiment of the present invention, the second container is a measuring cylinder.

[0013] In a preferred embodiment of the present invention, the air outlet of the air outlet pipe is located in the water column of the second container.

[0014] In a preferred embodiment of the present invention, the gas source comprises a gas cylinder, and a pressure reducing valve is installed at the gas outlet of the gas cylinder, and the gas outlet end of the pressure reducing valve is connected to the gas inlet of the peristaltic pump. The pressure reducing valve further reduces the outlet pressure of the gas cylinder, so that the outlet pressure is automatically kept stable.

[0015] In a preferred embodiment of the present invention, the liquid is distilled water.

[0016] The utility model also discloses a device for detecting impurity gases in oxygen, comprising a gas source, an outlet pipe of the gas source being connected to an air inlet of a peristaltic pump, the peristaltic pump being connected to an adjustable DC regulated power supply, power being supplied to the peristaltic pump by the adjustable DC regulated power supply, and an outlet of the peristaltic pump being connected to one end of a detection tube.

[0017] The utility model adjusts the current and voltage through an adjustable DC regulated power supply and can digitally display the real-time voltage and current values. For the same batch of test tubes, only the current and voltage values need to be calibrated for the first time, and the same current and voltage values can be used for the next experiment.

[0018] In a preferred embodiment of the present invention, the gas source includes a gas cylinder, a pressure reducing valve is installed at the gas outlet of the gas cylinder, the gas outlet end of the pressure reducing valve is connected to the gas inlet of the peristaltic pump, and the gas cylinder is an oxygen gas cylinder.

[0019] In a preferred embodiment of the present invention, the detection tube includes one of a carbon monoxide detection tube, a carbon dioxide detection tube and a water vapor detection tube.

[0020] In a preferred embodiment of the present invention, the other end of the detection tube is connected to a volume quantitative device, which includes a first container filled with liquid and a second container filled with liquid and with a scale. The second container is inverted in the liquid in the first container, and a liquid column is formed in the second container.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The utility model adjusts the current and voltage through an adjustable DC regulated power supply, and can digitally display the real-time voltage and current values. For the same batch of test tubes, only the current and voltage values need to be calibrated for the first time, and the same current and voltage values can be used for the next experiment.

[0023] 2. The peristaltic pump and DC voltage stabilizer are cheap and durable. The operation of the utility model is simple, and the experimental data obtained are accurate and stable.

[0024] 3. The peristaltic pump can accurately, uniformly, continuously and stably deliver gas into the detection tube, making the color of the color tube filler uniform, and the experimental results more accurate. Compared with using a manual quantitative syringe to extract gas, the influence of human factors on the results can be significantly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of Example 1 of the present utility model.

[0026] Figure 2 This is a structural diagram of Example 2 of the present utility model.

[0027] Figure 3 This is a structural diagram of Example 3 of the present utility model. DETAILED DESCRIPTION

[0028] Example 1

[0029] like Figure 1As shown, the gas quantitative device in one embodiment of the present invention includes a gas source, the outlet pipe of the gas source is connected to the air inlet of the peristaltic pump 3, the peristaltic pump 3 is connected to an adjustable DC regulated power supply 4, and the peristaltic pump 3 is powered by the adjustable DC regulated power supply 4. The outlet pipe 8 of the peristaltic pump 3 is connected to a volume quantitative device. The volume quantitative device includes a first container 5 filled with liquid and a second container 6 filled with liquid and with a scale. The second container 6 is inverted in the liquid in the first container 5, and a liquid column is formed in the second container 6. There are no bubbles at the top of the liquid column in the second container 6. The second container 6 is a measuring cylinder. The outlet of the outlet pipe 8 is located in the water column of the second container 6. The gas source includes a gas cylinder 1, and a pressure reducing valve 2 is installed at the outlet of the gas cylinder 1. The outlet end of the pressure reducing valve 2 is connected to the air inlet of the peristaltic pump 3.

[0030] The assembly steps of the gas metering device in one embodiment of the present invention include the following steps:

[0031] Step 1: Install the pressure reducing valve on the cylinder of oxygen to be tested, connect the outlet of the pressure reducing valve to the gas hose, turn on the cylinder switch, and rotate the low pressure gauge pressure regulating screw to make the oxygen flow out of the gas hose at an appropriate flow rate;

[0032] Step 2: Connect the power cord of the peristaltic pump to the adjustable DC regulated power supply interface, and adjust the current and voltage of the adjustable DC regulated power supply to the lowest level;

[0033] Step 3: Fill a 2000mL beaker with about 1000mL of water. Take a 200mL calibrated graduated cylinder, fill it with water, and turn it upside down in the beaker. A water column should form in the cylinder. Ensure there are no bubbles at the top of the water column.

[0034] Step 4: Connect the air inlet hose of the peristaltic pump to the hose at the outlet of the pressure reducing valve, connect the air outlet hose of the peristaltic pump to the inlet of the air outlet pipe, and place the air outlet of the air outlet pipe at the bottom of the measuring cylinder.

[0035] The operation steps of the gas quantitative device in one embodiment of the present invention include the following steps:

[0036] Step 5: Turn on the power of the DC voltage regulator, adjust the voltage / current, control the speed of the peristaltic pump, time it, observe the speed at which oxygen enters the measuring cylinder, and determine the speed at which oxygen is introduced.

[0037] Example 2

[0038] like Figure 2As shown, an impurity gas detection device in oxygen in one embodiment of the present invention includes a gas source, the gas outlet pipe of the gas source is connected to the gas inlet of a peristaltic pump 3, the peristaltic pump 3 is connected to an adjustable DC regulated power supply 4, and the peristaltic pump 3 is powered by the adjustable DC regulated power supply 4. The gas outlet of the peristaltic pump 3 is connected to one end of a detection tube 7. The gas source includes a gas cylinder 1, a pressure reducing valve 2 is installed at the gas outlet of the gas cylinder 1, and the gas outlet end of the pressure reducing valve 2 is connected to the gas inlet of the peristaltic pump 3. The gas cylinder 1 is an oxygen gas cylinder. The detection tube 7 includes one of a carbon monoxide detection tube, a carbon dioxide detection tube, and a water vapor detection tube. The other end of the detection tube 7 is connected to a volumetric quantitative device, which includes a first container 5 filled with liquid and a second container 6 filled with liquid and with a scale. The second container 6 is inverted in the liquid in the first container 5, and a liquid column is formed in the second container 6.

[0039] The assembly steps of the oxygen impurity gas detection device in one embodiment of the present invention include the following steps:

[0040] Step 1: Install the pressure reducing valve on the cylinder of oxygen to be tested, connect the outlet of the pressure reducing valve to the gas hose, turn on the cylinder switch, and rotate the low pressure gauge pressure regulating screw to make the oxygen flow out of the gas hose at an appropriate flow rate;

[0041] Step 2: Connect the power cord of the peristaltic pump to the adjustable DC regulated power supply interface, and adjust the current and voltage of the adjustable DC regulated power supply to the lowest level;

[0042] Step 3: Fill a 2000mL beaker with about 1000mL of water. Take a 200mL calibrated graduated cylinder, fill it with water, and turn it upside down in the beaker. A water column should form in the cylinder. Ensure there are no bubbles at the top of the water column.

[0043] Step 4: Connect the air inlet hose of the peristaltic pump to the hose at the outlet of the pressure reducing valve, connect the air outlet hose of the peristaltic pump to the gas inlet of the detection tube, connect the gas outlet of the detection tube to the hose, and pass the hose into the bottom of the measuring cylinder at the outlet.

[0044] The determination of the gas introduction rate of the detection tube in the device for detecting impurity gases in oxygen in one embodiment of the present invention comprises the following steps:

[0045] Step 5: Turn on the power supply of the DC voltage regulator, adjust the voltage / current, control the speed of the peristaltic pump, start timing, observe the speed at which oxygen enters the measuring cylinder, and determine the current and voltage values when 100 mL of gas is passed into the carbon monoxide detection tube for 4 minutes, 100 mL of gas is passed into the carbon dioxide detection tube for 2 minutes (1.5 minutes / 50 mL), and 100 mL of gas is passed into the water vapor detection tube for 1 minute.

[0046] Example 3

[0047] like Figure 3 As shown, an impurity gas detection device in oxygen in one embodiment of the present invention includes a gas source, the gas source outlet pipe being connected to the gas inlet of a peristaltic pump 3, the peristaltic pump 3 being connected to an adjustable DC regulated power supply 4, which supplies power to the peristaltic pump 3, and the gas outlet of the peristaltic pump 3 being connected to one end of a detection tube 7. The gas source includes a gas cylinder 1, the gas outlet of which is equipped with a pressure reducing valve 2, the gas outlet end of which is connected to the gas inlet of the peristaltic pump 3. The gas cylinder 1 is an oxygen cylinder. The detection tube 7 includes one of a carbon monoxide detection tube, a carbon dioxide detection tube, and a water vapor detection tube.

[0048] The assembly steps of the oxygen impurity gas detection device in one embodiment of the present invention include the following steps:

[0049] Step 1: Install the pressure reducing valve on the cylinder of oxygen to be tested, connect the outlet of the pressure reducing valve to the gas hose, turn on the cylinder switch, and rotate the low pressure gauge pressure regulating screw to make the oxygen flow out of the gas hose at an appropriate flow rate;

[0050] Step 2: Connect the power cord of the peristaltic pump to the adjustable DC regulated power supply interface, and adjust the current and voltage of the adjustable DC regulated power supply to the lowest level;

[0051] Step 3: Connect the air inlet hose of the peristaltic pump to the hose at the outlet of the pressure reducing valve, and connect the air outlet hose of the peristaltic pump to the gas inlet of the detection tube.

[0052] The detection of impurity gases in oxygen by the device for detecting impurity gases in oxygen in one embodiment of the present invention comprises the following steps:

[0053] Step 4: Turn on the power supply of the DC voltage regulator and adjust the current / voltage to the current and voltage determined in Example 2.

[0054] Step 5: Record the temperature and humidity in the laboratory. After the peristaltic pump has been emptied for a period of time, connect the peristaltic pump outlet hose to the gas inlet of the detection tube, and complete the detection of carbon monoxide, carbon dioxide, and water in turn. Read the results immediately after each test, and convert the measured gas content according to the laboratory temperature according to the instructions.

[0055] The oxygen produced by Company A was measured using the method of this application. The carbon monoxide result was less than 0.0001% (mL / mL), the carbon dioxide result was less than 0.01% (mL / mL), and the moisture detection tube reading was 0.4 mg / L. After calibration, the result was 0.34 mg / L, which was converted to 0.000034% (mL / mL).

Claims

1. A gas dosing device, comprising a gas source, wherein the gas outlet pipe of the gas source is connected to the gas inlet of a peristaltic pump (3), characterized in that: The peristaltic pump (3) is powered by an adjustable DC regulated power supply (4), and the air outlet pipe (8) of the peristaltic pump (3) is connected to the volume quantitative device; The volume dosing device comprises a first container (5) filled with liquid and a second container (6) filled with liquid and having a scale, wherein the second container (6) is inverted in the liquid in the first container (5), and a liquid column is formed in the second container (6).

2. The gas quantitative device according to claim 1, characterized in that: There are no bubbles at the top of the liquid column in the second container (6).

3. The gas quantitative device according to claim 1, characterized in that: The second container (6) is a measuring cylinder.

4. The gas quantitative device according to claim 1, characterized in that: The air outlet of the air outlet pipe (8) is located in the water column of the second container (6).

5. The gas quantitative device according to any one of claims 1 to 4, characterized in that: The gas source comprises a gas cylinder (1), a pressure reducing valve (2) is installed at the gas outlet of the gas cylinder (1), and the gas outlet end of the pressure reducing valve (2) is connected to the gas inlet of the peristaltic pump (3).

6. A device for detecting impurity gases in oxygen, comprising a gas source, wherein the gas outlet pipe of the gas source is connected to the gas inlet of a peristaltic pump (3), characterized in that: The peristaltic pump (3) is connected to an adjustable DC regulated power supply (4), and the peristaltic pump (3) is powered by the adjustable DC regulated power supply (4). The air outlet of the peristaltic pump (3) is connected to one end of the detection tube (7).

7. The device for detecting impurity gases in oxygen according to claim 6, characterized in that: The gas source comprises a gas cylinder (1), a pressure reducing valve (2) is installed at the gas outlet of the gas cylinder (1), the gas outlet end of the pressure reducing valve (2) is connected to the gas inlet of the peristaltic pump (3), and the gas cylinder (1) is an oxygen gas cylinder.

8. The device for detecting impurity gases in oxygen according to claim 6, characterized in that: The detection tube (7) comprises one of a carbon monoxide detection tube, a carbon dioxide detection tube and a water vapor detection tube.

9. The device for detecting impurity gases in oxygen according to claim 6, characterized in that: The other end of the detection tube (7) is connected to a volumetric quantitative device, which comprises a first container (5) filled with liquid and a second container (6) filled with liquid and having a scale, wherein the second container (6) is inverted in the liquid in the first container (5), and a liquid column is formed in the second container (6).

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