Automatic gas protection liquid taking flow path system for flammable liquid and liquid taking device

Abstract

The utility model relates to the field of liquid taking devices, in particular to an automatic gas protection liquid taking flow path system for flammable liquid and a liquid taking device, which comprises a gas source, the gas source is connected into an inlet of a pressure reducing valve through a gas pipe, an outlet of the pressure reducing valve is connected with a pressure sensor, and the pressure sensor is connected with an inlet of an electromagnetic valve I; an outlet of the electromagnetic valve I is connected with an inlet of the electromagnetic valve II, a normally-open end of the electromagnetic valve II is connected with the damping pipe I, a normally-closed end of the electromagnetic valve II is connected with the damping pipe II, two outlets of the damping pipe I and the damping pipe II are connected with two ends of the tee joint respectively, and the last end of the tee joint is connected with the air outlet pipe; the input end of the infusion pump is connected with the common end of the selector valve, the output end of the infusion pump is provided with a liquid outlet pipe, the selector valve is provided with a plurality of channels, and each channel is connected with a liquid storage tank; and the oxygen sensor extends into the liquid taking container. According to the utility model, the liquid taking range is large in span, and after high-flow gas purging, small-flow protective gas is continuously used for continuous protection in and after the liquid taking process, so that the continuous safety and reliability of the whole process are ensured.

Description

Technical Field

[0001] The utility model relates to the field of liquid collection devices, in particular to an automatic gas protection liquid collection flow path system and a liquid collection device for flammable liquids. Background Art

[0002] In laboratories, commonly used organic solvents are often toxic, hazardous, and flammable. To facilitate the quantitative removal of organic solvents within the commonly used chemical reaction volume range of 5-2000mL, bottle-top dispensers are currently the most common solution. By moving a piston assembly equipped with one-way valves on both the aspiration and discharge paths up and down, liquid reagents from a large container can be quantitatively drawn into the dispenser and then discharged to the dispenser's outlet. This process ensures that the desired liquid reagent is quantitatively injected into the target container.

[0003] In many organic chemistry experiments, especially catalytic experiments, the interior of the container is highly reactive due to factors such as the addition of catalysts. Directly injecting flammable liquids into the container can render the reagent ineffective when exposed to water vapor and oxygen, or cause fire and explosion of the solvent. Therefore, before adding catalysts or liquid reagents, experimenters typically use a protective gas such as argon or nitrogen to completely displace the air inside the container, ensuring an inert, water-free and oxygen-free state.

[0004] The bottle-mouth dispenser has the following defects when in use:

[0005] One issue is the limited range of applicable liquid dispensing. Because the dispensing volume is entirely controlled by piston stroke, the maximum and minimum ranges for a single dispensing volume typically differ by only an order of magnitude (for example, a common bottle-top dispenser with a 10-100mL range). This makes dispensing small or extremely large amounts of liquid reagents (e.g., 1mL and 5000mL) difficult to control or requires numerous manual aspiration and dispensing operations.

[0006] Secondly, the bottle-top dispenser can only be used for a single container and cannot organize multiple liquid reagents on one device, which is inconvenient to use as needed.

[0007] Third, and most importantly, it fails to provide a shielding gas purge for the liquid collection container. For applications requiring strict oxygen-free liquid collection (such as when containing catalysts like palladium-on-carbon or Raney nickel), the existing process requires users to replace the air in the collection container with nitrogen or argon using a separate gas source before moving the container to a device like a bottle-top dispenser for liquid collection. Because the process is divided into two steps, the movement and time interval between them could cause the shielding gas to escape, posing a safety risk. Utility Model Content

[0008] The utility model aims to solve the problems in the background technology of small liquid taking range and inconvenience in filling with protective gas, and proposes an automatic gas protection liquid taking device for flammable liquid.

[0009] On the one hand, the utility model provides an automatic gas protection liquid extraction flow path system for flammable liquids, including a gas source, which is connected to the inlet of a pressure reducing valve through an air pipe, the outlet of the pressure reducing valve is connected to a pressure sensor, the pressure sensor is connected to the inlet of a solenoid valve I, the outlet of the solenoid valve I is connected to the inlet of a solenoid valve II, the normally open end of the solenoid valve II is connected to a damping tube I, the normally closed end of the solenoid valve II is connected to a damping tube II, the damping of the damping tube I is lower than that of the damping tube II, the two outlets of the damping tube I and the damping tube II are respectively connected to the two ends of a tee, and the last end of the tee is connected to the gas outlet pipe;

[0010] It also includes an infusion pump, a selection valve and an oxygen sensor. The input end of the infusion pump is connected to the common end of the selection valve. The output end of the infusion pump is provided with a liquid outlet pipe. The liquid outlet pipe and the air outlet pipe extend into the liquid collection container. The selection valve is provided with multiple channels connected to the common end, and each channel is connected to a liquid storage tank; the oxygen sensor is electrically connected to the main control board, and the oxygen sensor also extends into the liquid collection container and is higher than the output ports of the liquid outlet pipe and the air outlet pipe.

[0011] Preferably, four channels connected to the common end are provided on the selection valve.

[0012] Preferably, the outlet pressure of the pressure reducing valve is 0.3 MPa, the protective gas flow rate of the damping tube I is 3 L / min, and the protective gas flow rate of the damping tube II is 0.3 L / min.

[0013] On the other hand, the utility model proposes an automatic gas-protected liquid collection device for flammable liquids, including a push-pull bracket, a bracket arranged on the push-pull bracket, a lifting bottle mouth cover plate arranged on the bracket for sliding in the vertical direction, a lifting arm arranged on the lifting bottle mouth cover plate for sliding in the vertical direction, and a flexible drag chain connected to the lifting arm. The lifting arm is a hollow structure, and the lines of the liquid outlet pipe, the air outlet pipe and the oxygen sensor all pass through the lifting arm and the flexible drag chain, and a liquid outlet is formed at the bottom of the lifting arm.

[0014] Preferably, an upper limit slot is provided on the bracket, and the lifting bottle mouth cover plate slides in cooperation with the upper limit slot.

[0015] Preferably, a bottle mouth limiter is provided on the lifting bottle mouth cover plate, and the bottle mouth limiter limits the bottle mouth of the liquid taking container to ensure that the center of the liquid taking container and the liquid outlet coincide in vertical projection.

[0016] Preferably, the lifting arm vertically passes through the lifting bottle mouth cover plate, and a rotation limit pin for positioning the lifting arm is provided on the lifting bottle mouth cover plate.

[0017] Compared with the prior art, the utility model has the following beneficial technical effects: the liquid collection range has a large span. The infusion pump can provide multiple flow rates, so that the liquid collection volume can be continuously adjusted within the range of 1-5000mL. The selection valve provides an expandable number of reagent selection types. The device can provide protective gas filling for the liquid collection container, and the purge endpoint is confirmed by the oxygen content probe to ensure that the oxygen content in the container meets the safety standard. After the large-flow gas purge, a small-flow protective gas is continuously used for protection during and after the liquid collection process to ensure the continuous safety and reliability of the entire process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the automatic gas protection liquid extraction flow system for flammable liquids;

[0019] Figure 2 This is a schematic diagram of the structure of an automatic gas protection liquid collection device for flammable liquids;

[0020] Figure 3 for Figure 2 side view.

[0021] Figure numerals: 1. gas source; 2. pressure reducing valve; 3. pressure sensor; 4. solenoid valve I; 5. solenoid valve II; 6. damping tube I; 7. damping tube II; 8. tee; 9. oxygen sensor; 10. liquid collection container; 11. infusion pump; 12. selection valve; 13. liquid storage tank; 14. flexible drag chain; 15. lifting arm; 16. upper limit slot; 17. rotary limit pin; 18. lifting bottle mouth cover; 19. bottle mouth limit; 20. liquid outlet; 21. push-pull bracket. DETAILED DESCRIPTION

[0022] Example 1

[0023] like Figure 1 As shown, the utility model proposes an automatic gas protection liquid extraction flow path system for flammable liquids, including a gas source 1, which is connected to the inlet of a pressure reducing valve 2 through an air pipe, the outlet of the pressure reducing valve 2 is connected to a pressure sensor 3, the pressure sensor 3 is connected to the inlet of an electromagnetic valve I4, the outlet of the electromagnetic valve I4 is connected to the inlet of an electromagnetic valve II5, the normally open end of the electromagnetic valve II5 is connected to a damping tube I6, the normally closed end of the electromagnetic valve II5 is connected to a damping tube II7, the damping of the damping tube I6 is lower than that of the damping tube II7, the two outlets of the damping tube I6 and the damping tube II7 are respectively connected to the two ends of a tee 8, the last end of the tee 8 is connected to the air outlet pipe, the outlet pressure of the pressure reducing valve 2 is 0.3 MPa, the protective gas flow rate of the damping tube I6 is 3 L / min, and the protective gas flow rate of the damping tube II7 is 0.3 L / min;

[0024] It also includes an infusion pump 11, a selection valve 12 and an oxygen sensor 9. In this embodiment, the infusion pump 11 is a peristaltic pump, and other types of infusion pumps such as plunger pumps, gear pumps, and syringe pumps can also be used. The input end of the infusion pump 11 is connected to the common end of the selection valve 12, and a liquid outlet pipe is provided at the output end of the infusion pump 11. The liquid outlet pipe and the air outlet pipe extend into the liquid collection container. A plurality of channels connected to the common end are provided on the selection valve 12, and each channel is connected to a liquid storage tank 13. In this embodiment, four channels connected to the common end are provided on the selection valve 12, and valves with other numbers of channels and types can be equivalently replaced; the oxygen sensor 9 is electrically connected to the main control board, and the oxygen sensor 9 also extends into the liquid collection container and is higher than the output ports of the liquid outlet pipe and the air outlet pipe.

[0025] The following is a detailed description of each component: Infusion pump 11 delivers fluid according to the set infusion volume. It is connected via an infusion line. In typical use cases, it is a peristaltic pump, but other types of infusion pumps, such as plunger pumps, gear pumps, and syringe pumps, can also be substituted. The pump tubing of infusion pump 11, which comes into contact with the liquid, is made of BPT material, which is resistant to common organic solvents, or polytetrafluoroethylene-lined pump tubing. The infusion line is preferably made of polyurethane hose to prevent static electricity accumulation, but other common hoses, such as polytetrafluoroethylene or perfluoroethylene-propylene copolymer, can also be used. Pressure reducing valve 2 is a common laboratory gas pressure reducing valve used to adjust the pressure of the incoming 0.6-1 MPa shielding gas to the normal operating pressure of the equipment. Pressure sensor 3 is used to test the incoming gas pressure and generate an alarm if the shielding gas input pressure does not meet the equipment's operating requirements. Solenoid valve I4 acts as a shielding gas switch. The two-position, three-way solenoid valve II5 selects the gas path, routing the shielding gas from solenoid valve I4 through two different flow paths. Damping tubes I6 and II7 provide appropriate backpressure, with the damping of damping tube I6 being less than that of damping tube II7. This allows the shielding gas to flow through the opening of damping tube I6, allowing a higher flow rate of shielding gas, while the opening of damping tube II7 allows a lower flow rate of shielding gas. Tee 8 combines the shielding gas exiting damping tubes I6 and II7 and directs it to the liquid collection container 10. An oxygen sensor 9 extends into the tip of the liquid collection container 10 to measure the residual oxygen content within the container and facilitates the operation of the back-control system. The gas connection piping is conventional polytetrafluoroethylene or perfluoroethylene-propylene copolymer piping.

[0026] Example 2

[0027] like Figure 2 and Figure 3As shown, the utility model proposes an automatic gas protection liquid collection device for flammable liquids, which utilizes the flow path system mentioned in Example 1, including a push-pull bracket 21, a bracket arranged on the push-pull bracket 21, a lifting bottle mouth cover plate 18 slidingly arranged on the bracket in the vertical direction, a lifting arm 15 slidingly arranged on the lifting bottle mouth cover plate 18 in the vertical direction, and a flexible drag chain 14 connected to the lifting arm 15. The lifting arm is a hollow structure, and the lines of the liquid outlet pipe, the air outlet pipe and the oxygen sensor 9 all pass through the lifting arm 15 and the flexible drag chain 14, and a liquid outlet 20 is formed at the bottom of the lifting arm.

[0028] Furthermore, an upper limit slot 16 is provided on the bracket, and the lifting bottle mouth cover plate 18 slides in cooperation with the upper limit slot 16 .

[0029] Furthermore, a bottle mouth limiter 19 is provided on the lifting bottle mouth cover plate 18 , and the bottle mouth limiter 19 limits the bottle mouth of the liquid taking container to ensure that the center of the liquid taking container and the liquid outlet coincide with each other in vertical projection.

[0030] Furthermore, the lifting arm 15 vertically passes through the lifting bottle mouth cover plate 18 , and the lifting bottle mouth cover plate 18 is provided with a rotation limit pin 17 for positioning the lifting arm 15 .

[0031] In summary, when the present invention is in use, the device presets an oxygen content safety threshold according to experimental safety requirements.

[0032] To fill the container with protective gas: Place the liquid collection container 10 on the push-pull bracket 21, with the bottle mouth and bottle mouth limiter 19 aligned. Move the lifting bottle mouth cover 18 downward until it covers the bottle mouth. Turn the rotary limit pin 17, and the inner sleeve of the arm, which carries the liquid outlet pipe, gas outlet pipe, and oxygen sensor 9, descends under its own weight to the bottom of the liquid collection container 10. Then, start the purge operation. Solenoid valve I4 opens, introducing high-pressure protective gas to solenoid valve II5. Solenoid valve II5 is normally open, and gas is blown out at a high flow rate through damping tube I6, rapidly purging the liquid collection container. When the oxygen sensor 9 readback value falls below the oxygen content safety threshold, the system determines that the protective gas filling is complete. The normally closed port of solenoid valve II5 opens, and gas is blown out at a low flow rate through damping tube II7, providing a slight positive pressure in the liquid collection container 10 to prevent external oxygen from re-entering the container. A prompt indicating that the step is complete is displayed.

[0033] Infusion type selection and quantitative liquid collection method under protective atmosphere: lift the inner sleeve of the arm equipped with the liquid outlet tube, air outlet tube and oxygen sensor, rotate to clamp the rotation limit pin, and lift the liquid outlet to a position close to the bottle mouth inside the bottle.

[0034] After entering the infusion channel and dosage on the control panel, infusion pump 11 starts, dispensing the liquid reagent according to the set channel and flow rate. During the infusion process and after quantitative liquid withdrawal is completed, solenoid valve I4 opens, introducing high-pressure protective gas to solenoid valve II5. The normally closed port of solenoid valve II5 opens, and the gas is blown out at a low flow rate through damping tube II7, providing a slight positive pressure in the liquid withdrawal container 10 to prevent external oxygen from entering the container and achieve safe gas protection throughout the entire process. After liquid withdrawal is completed, the device will indicate that the step is completed, and the user will remove the container and turn off the low-flow purge.

[0035] Safety Alarm Functions: Oxygen content alarm. When selecting infusion types and quantitatively withdrawing liquids under a protective atmosphere, if the readback value of oxygen sensor 9 exceeds the safety threshold, the system will issue a corresponding warning. Gas underpressure alarm. When the readback value of pressure sensor 3 falls below the minimum gas pressure setting, the system determines that the pressure input of the protective gas source is insufficient and the system will issue a corresponding warning.

[0036] In the present invention, the liquid collection range spans a large range. The infusion pump 11 can provide multiple flow rates, so that the liquid collection volume can be continuously adjusted within the range of 1-5000mL. The selection valve 12 provides an expandable number of reagent selection types. The device can provide protective gas filling for the liquid collection container 10, and the purging end point is confirmed by the oxygen content probe to ensure that the oxygen content in the container meets the safety standard. After the large-flow gas purging, a small-flow protective gas is continuously used for continuous protection during and after the liquid collection process to ensure the continuous safety and reliability of the entire process.

[0037] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. An automatic gas protection liquid extraction flow path system for flammable liquids, characterized in that: The invention comprises an air source (1), wherein the air source (1) is connected to the inlet of a pressure reducing valve (2) through an air pipe, the outlet of the pressure reducing valve (2) is connected to a pressure sensor (3), the pressure sensor (3) is connected to the inlet of an electromagnetic valve I (4), the outlet of the electromagnetic valve I (4) is connected to the inlet of an electromagnetic valve II (5), the normally open end of the electromagnetic valve II (5) is connected to a damping tube I (6), the normally closed end of the electromagnetic valve II (5) is connected to a damping tube II (7), the damping of the damping tube I (6) is lower than that of the damping tube II (7), the two outlets of the damping tube I (6) and the damping tube II (7) are respectively connected to the two ends of a tee (8), and the last end of the tee (8) is connected to an air outlet pipe; The invention also includes an infusion pump (11), a selection valve (12) and an oxygen sensor (9). The input end of the infusion pump (11) is connected to the common end of the selection valve (12). The output end of the infusion pump (11) is provided with a liquid outlet pipe, and the liquid outlet pipe and the air outlet pipe extend into the liquid collection container. The selection valve (12) is provided with a plurality of channels connected to the common end, and each channel is connected to a liquid storage tank (13). The oxygen sensor (9) is electrically connected to the main control board, and the oxygen sensor (9) also extends into the liquid collection container and is higher than the output ports of the liquid outlet pipe and the air outlet pipe.

2. The automatic gas protection liquid extraction flow path system for flammable liquids according to claim 1, characterized in that: The selection valve (12) is provided with four channels connected to the common end.

3. The automatic gas protection liquid extraction flow path system for flammable liquids according to claim 1, characterized in that: The outlet pressure of the pressure reducing valve (2) is 0.3 MPa, the protective gas flow rate of the damping tube I (6) is 3 L / min, and the protective gas flow rate of the damping tube II (7) is 0.3 L / min.

4. An automatic gas protection liquid collection device for flammable liquids, utilizing the automatic gas protection liquid collection flow path system for flammable liquids according to claim 1, characterized in that: The invention comprises a push-pull bracket (21), a bracket arranged on the push-pull bracket (21), a lifting bottle mouth cover plate (18) arranged on the bracket in a vertical direction, a lifting arm (15) arranged on the lifting bottle mouth cover plate (18) in a vertical direction, and a flexible drag chain (14) connected to the lifting arm (15). The lifting arm is a hollow structure, and the lines of the liquid outlet pipe, the gas outlet pipe and the oxygen sensor (9) all pass through the lifting arm (15) and the flexible drag chain (14). A liquid outlet (20) is formed at the bottom of the lifting arm.

5. The automatic gas protection liquid collection device for flammable liquids according to claim 4, characterized in that: An upper limit slot (16) is provided on the bracket, and the lifting bottle mouth cover plate (18) slides in cooperation with the upper limit slot (16).

6. The automatic gas protection liquid collection device for flammable liquids according to claim 4, characterized in that: A bottle mouth limiter (19) is provided on the lifting bottle mouth cover plate (18), and the bottle mouth limiter (19) limits the bottle mouth of the liquid taking container to ensure that the center of the liquid taking container and the liquid outlet coincide in vertical projection.

7. The automatic gas protection liquid collection device for flammable liquids according to claim 4, characterized in that: The lifting arm (15) vertically passes through the lifting bottle mouth cover plate (18), and a rotation limit pin (17) for positioning the lifting arm (15) is provided on the lifting bottle mouth cover plate (18).

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