Negative pressure type sampling device
By designing a negative pressure sampling device, the principles of negative pressure extraction and positive pressure cleaning are adopted, and the problems of air pollution and operation hazards during the sampling process are solved, achieving a safe, accurate and environmentally friendly sampling effect.
Patent Information
- Application Number
- CN202421677843.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-15
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-15
AI Technical Summary
In the prior art, air pollution and operation hazards are easily caused during the sampling process, and the sampling solution is easily oxidized, resulting in inaccurate detection results.
A negative pressure sampling device is designed, adopting the principles of negative pressure extraction and positive pressure cleaning. The vacuum pump and controller realize functions such as one-click sampling, one-click flushing, and one-click emergency stop to ensure the safety, accuracy and environmental protection of the sampling process.
A safe, accurate and environmentally friendly sampling process is achieved, which avoids air pollution and operational hazards, and ensures the accuracy of the sampling solution.
Smart Images
Figure CN222913225U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of sampling, in particular to a negative pressure sampling device. Background Art
[0002] At present, in the biomedical, chemical and pharmaceutical industries, there is a common scenario of sampling by pure manual operation. Operators wear protective clothing in the laboratory or outside, relying on simple tools such as test tubes and sampling instruments to perform unquantified sampling. At this time, the sampled liquid is easy to evaporate into the air, causing air pollution; at the same time, it poses a certain risk to the operator. In addition, the oxygen in the air is also easy to oxidize the sampled liquid, resulting in inaccurate test results of the sampled solution. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a negative pressure sampling device, which can realize functions such as one-key sampling, one-key flushing, and one-key emergency stop, and can realize safe, accurate, and environmentally friendly sampling of toxic and polluting solvents / solutions.
[0004] The utility model negative pressure sampling device comprises a first tank body, a second tank body, a vacuum pump and a controller, a first pipeline is connected between the first tank body and the second tank body, a first solenoid valve and a second solenoid valve are sequentially connected to the first pipeline along the direction from the first tank body to the second tank body, a second pipeline is connected between the second tank body and the inlet of the vacuum pump, a first adsorber, a third solenoid valve and a first electric regulating valve are sequentially connected to the second pipeline along the direction from the second tank body to the vacuum pump, a first exhaust pipeline, a first pressure transmitter and a first pressure gauge are connected to the second pipeline between the first adsorber and the third solenoid valve, a fourth solenoid valve and a first pressure safety valve are sequentially connected to the first exhaust pipeline along the direction from upstream to downstream, one end of the third pipeline is connected to the first tank body, the other end of the third pipeline is connected to an inert gas purge gas source, and the third pipeline is sequentially connected to There are a second adsorber, a one-way valve, a second electric regulating valve, a fifth solenoid valve and a sixth solenoid valve. The third pipeline between the second adsorber and the one-way valve is connected with a second exhaust pipeline, a second pressure transmitter and a second pressure gauge. The second exhaust pipeline is sequentially connected with a seventh solenoid valve, a second pressure safety valve and a third adsorber in the direction from upstream to downstream. A fourth pipeline is connected between the third pipeline and the first pipeline. One end of the fourth pipeline is connected to the third pipeline between the fifth solenoid valve and the sixth solenoid valve, and the other end of the fourth pipeline is connected to the first pipeline between the first solenoid valve and the second solenoid valve. The fourth pipeline is connected with an eighth solenoid valve. The vacuum pump, the first pressure transmitter, the second pressure transmitter, the first electric regulating valve, the second electric regulating valve, the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve, the sixth solenoid valve, the seventh solenoid valve and the eighth solenoid valve are all electrically connected to the controller.
[0005] The utility model discloses a negative pressure sampling device, wherein the outlet of the vacuum pump is connected with a third exhaust pipeline, and the third exhaust pipeline is connected with a fourth adsorber.
[0006] The utility model discloses a negative pressure sampling device, wherein the first pipeline is also connected with a first stop valve and a second stop valve, the first stop valve is located on the first pipeline between the first tank body and the first solenoid valve, and the second stop valve is located on the first pipeline between the second solenoid valve and the second tank body.
[0007] The utility model discloses a negative pressure sampling device, wherein the connection point between the first exhaust pipeline and the second pipeline is the first connection point, the first pressure transmitter is connected to the second pipeline through the fifth pipeline, the connection point between the fifth pipeline and the second pipeline is the second connection point, the first pressure gauge is connected to the second pipeline through the sixth pipeline, the connection point between the sixth pipeline and the second pipeline is the third connection point, and the first connection point, the second connection point and the third connection point are arranged in sequence on the second pipeline along the direction from the first adsorber to the third solenoid valve.
[0008] The utility model provides a negative pressure sampling device, wherein the second pipeline is also connected with a third stop valve, the third stop valve is located on the second pipeline between the first adsorber and the first connection point, the fifth pipeline is connected with a fourth stop valve, and the sixth pipeline is connected with a fifth stop valve.
[0009] The utility model discloses a negative pressure sampling device, wherein the connection point between the second exhaust pipeline and the third pipeline is the fourth connection point, the second pressure transmitter is connected to the third pipeline through the seventh pipeline, the connection point between the seventh pipeline and the third pipeline is the fifth connection point, the second pressure gauge is connected to the third pipeline through the eighth pipeline, the connection point between the eighth pipeline and the third pipeline is the sixth connection point, and the fourth connection point, the fifth connection point and the sixth connection point are arranged in sequence on the third pipeline along the direction from the second adsorber to the one-way valve.
[0010] The utility model provides a negative pressure sampling device, wherein the third pipeline is also connected with a sixth stop valve, the sixth stop valve is located on the third pipeline between the fourth connection point and the fifth connection point, the seventh pipeline is connected with a seventh stop valve, and the eighth pipeline is connected with an eighth stop valve.
[0011] The utility model discloses a negative pressure sampling device, wherein the first pipeline is connected with a first stress-relieving bellows, and the fourth pipeline is connected with a second stress-relieving bellows.
[0012] The difference between the negative pressure sampling device of the utility model and the prior art is that the negative pressure sampling device of the utility model adopts the principle of negative pressure extraction and positive pressure cleaning. The sampling stage uses negative pressure power to sample the sampled medium, and positive pressure is used in the cleaning and purging process. During sampling, the first tank body is used as a storage tank to hold the sampled medium (such as toxic and polluting solvents / solutions); the second tank body is used as a sampling tank to hold the sampled medium. Before sampling, the sampling device automatically controls the vacuum pump to pump the second tank body and the second pipeline into a negative pressure state (to meet the sampling volume requirements). After sampling, the sampling device will use positive pressure to purge, blowing part of the remaining medium in the pipeline into the second tank body (the volume of this part of the medium has been calculated into the sampling volume) and the other part of the remaining medium into the first tank body. During cleaning, the other first tank body is used as a cleaning tank to hold clean water; the other second tank body is used as a waste liquid tank to hold cleaning waste liquid. The sampling device relies on positive pressure to push the clean water in the cleaning tank into the first pipeline, clean the first pipeline, and ensure that there is no residue inside the first pipeline. After cleaning, the sampling device automatically turns on the gas purge to clean the remaining liquid (mainly water) in the first pipeline to ensure accurate sampling next time. All cleaning waste liquid will enter the waste liquid tank for sealing, which is convenient for the next operation. The utility model controls each electronic component through a controller, and can realize functions such as one-button sampling, one-button flushing, and one-button emergency stop, which can realize safe, accurate, and environmentally friendly sampling of toxic and polluting solvents / solutions.
[0013] The utility model will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a structural principle diagram of the negative pressure sampling device of the utility model. DETAILED DESCRIPTION
[0015] like Figure 1As shown, the negative pressure sampling device of the utility model comprises a first tank body 1, a second tank body 9, a vacuum pump 26 and a controller 55, a first pipeline 3 is connected between the first tank body 1 and the second tank body 9, a first solenoid valve 4 and a second solenoid valve 7 are sequentially connected to the first pipeline 3 along the direction from the first tank body 1 to the second tank body 9, a second pipeline 24 is connected between the second tank body 9 and the inlet of the vacuum pump 26, a first adsorber 10, a third solenoid valve 23 and a first electric regulating valve 25 are sequentially connected to the second pipeline 24 along the direction from the second tank body 9 to the vacuum pump 26, and the first adsorber The first exhaust pipeline 15, the first pressure transmitter 18 and the first pressure gauge 22 are connected to the second pipeline 24 between the first and second solenoid valves 10 and 23. The first exhaust pipeline 15 is connected to the fourth solenoid valve 13 and the first pressure safety valve 14 in sequence along the direction from upstream to downstream (i.e., the direction in which the gas in the first exhaust pipeline 15 flows). The first tank body 1 is connected to one end of the third pipeline 37. The other end of the third pipeline 37 is connected to the inert gas purge source 29. The third pipeline 37 is connected to the second adsorber 49 in sequence along the direction from the first tank body 1 to the inert gas purge source 29. , a one-way valve 38, a second electric regulating valve 36, a fifth solenoid valve 35 and a sixth solenoid valve 30; a second exhaust pipeline 53, a second pressure transmitter 46 and a second pressure gauge 42 are connected to the third pipeline 37 between the second adsorber 49 and the one-way valve 38; a seventh solenoid valve 50, a second pressure safety valve 51 and a third adsorber 52 are sequentially connected to the second exhaust pipeline 53 in a direction from upstream to downstream (i.e., the direction in which the gas in the second exhaust pipeline 53 flows); a fourth pipeline 34 is connected between the third pipeline 37 and the first pipeline 3; one end of the fourth pipeline 34 is connected to the fifth On the third pipeline 37 between the solenoid valve 35 and the sixth solenoid valve 30, the other end of the fourth pipeline 34 is connected to the first pipeline 3 between the first solenoid valve 4 and the second solenoid valve 7, and the eighth solenoid valve 33 is connected to the fourth pipeline 34, and the vacuum pump 26, the first pressure transmitter 18, the second pressure transmitter 46, the first electric regulating valve 25, the second electric regulating valve 36, the first solenoid valve 4, the second solenoid valve 7, the third solenoid valve 23, the fourth solenoid valve 13, the fifth solenoid valve 35, the sixth solenoid valve 30, the seventh solenoid valve 50 and the eighth solenoid valve 33 are all electrically connected to the controller 55.
[0016] In the negative pressure sampling device of the utility model, the outlet of the vacuum pump 26 is connected to a third exhaust pipeline 27 , and the third exhaust pipeline 27 is connected to a fourth adsorber 28 .
[0017] The first adsorber 10 , the second adsorber 49 , the third adsorber 52 and the fourth adsorber 28 belong to the prior art. When the gas flows through the adsorber, the adsorber can adsorb harmful substances in the gas.
[0018] In the negative pressure sampling device of the utility model, the first pipeline 3 is also connected with a first stop valve 2 and a second stop valve 8, the first stop valve 2 is located on the first pipeline 3 between the first tank body 1 and the first solenoid valve 4, and the second stop valve 8 is located on the first pipeline 3 between the second solenoid valve 7 and the second tank body 9.
[0019] The utility model discloses a negative pressure sampling device, wherein the connection point between the first exhaust pipeline 15 and the second pipeline 24 is the first connection point 12, the first pressure transmitter 18 is connected to the second pipeline 24 through the fifth pipeline 54, the connection point between the fifth pipeline 54 and the second pipeline 24 is the second connection point 16, the first pressure gauge 22 is connected to the second pipeline 24 through the sixth pipeline 20, the connection point between the sixth pipeline 20 and the second pipeline 24 is the third connection point 19, and the first connection point 12, the second connection point 16 and the third connection point 19 are arranged in sequence on the second pipeline 24 along the direction from the first adsorber 10 to the third solenoid valve 23.
[0020] The gas in the second pipeline 24 can enter the first exhaust pipeline 15 from the first connection point 12 for discharge. Therefore, the first connection point 12 is the upstream starting point of the gas flow direction in the first exhaust pipeline 15. The gas starts from the first connection point 12 and passes through the fourth solenoid valve 13 and the first pressure safety valve 14 in sequence before being discharged. Therefore, the fourth solenoid valve 13 and the first pressure safety valve 14 are arranged in sequence on the first exhaust pipeline 15 along the direction from upstream to downstream.
[0021] In the negative pressure sampling device of the utility model, the second pipeline 24 is also connected to a third stop valve 11, and the third stop valve 11 is located on the second pipeline 24 between the first adsorber 10 and the first connection point 12, the fifth pipeline 54 is connected to a fourth stop valve 17, and the sixth pipeline 20 is connected to a fifth stop valve 21.
[0022] The utility model discloses a negative pressure sampling device, wherein the connection point between the second exhaust pipeline 53 and the third pipeline 37 is the fourth connection point 48, the second pressure transmitter 46 is connected to the third pipeline 37 through the seventh pipeline 45, the connection point between the seventh pipeline 45 and the third pipeline 37 is the fifth connection point 43, the second pressure gauge 42 is connected to the third pipeline 37 through the eighth pipeline 41, the connection point between the eighth pipeline 41 and the third pipeline 37 is the sixth connection point 39, and the fourth connection point 48, the fifth connection point 43 and the sixth connection point 39 are arranged in sequence on the third pipeline 37 along the direction from the second adsorber 49 to the one-way valve 38.
[0023] The gas in the third pipeline 37 can enter the second exhaust pipeline 53 from the fourth connection point 48 for discharge. Therefore, the fourth connection point 48 is the upstream starting point of the gas flow direction in the second exhaust pipeline 53. The gas starts from the fourth connection point 48 and passes through the seventh solenoid valve 50, the second pressure safety valve 51 and the third adsorber 52 in sequence before being discharged. Therefore, the seventh solenoid valve 50, the second pressure safety valve 51 and the third adsorber 52 are arranged in sequence from upstream to downstream on the second exhaust pipeline 53.
[0024] The utility model negative pressure sampling device, wherein the third pipeline 37 is also connected to a sixth stop valve 47, the sixth stop valve 47 is located on the third pipeline 37 between the fourth connection point 48 and the fifth connection point 43, the seventh pipeline 45 is connected to a seventh stop valve 44, and the eighth pipeline 41 is connected to an eighth stop valve 40.
[0025] The utility model negative pressure sampling device, wherein the first pipeline 3 is connected to a first stress-relieving bellows 5, and the fourth pipeline 34 is connected to a second stress-relieving bellows 32. The stress-relieving bellows is a prior art, and its specific structure and working principle are not described in detail. The connection point between the fourth pipeline 34 and the third pipeline 37 is the seventh connection point 31, the connection point between the fourth pipeline 34 and the first pipeline 3 is the eighth connection point 6, the first stress-relieving bellows 5 is located between the eighth connection point 6 and the first solenoid valve 4, and the second stress-relieving bellows 32 is located between the seventh connection point 31 and the eighth solenoid valve 33.
[0026] The difference between the negative pressure sampling device of the utility model and the prior art is that the negative pressure sampling device of the utility model adopts the principle of negative pressure extraction and positive pressure cleaning. The sampling stage uses negative pressure power to sample the sampled medium, and the cleaning and purging process uses positive pressure. During sampling, the first tank body 1 is used as a storage tank to hold the sampled medium (such as toxic and polluting solvents / solutions); the second tank body 9 is used as a sampling tank to hold the sampled medium. Before sampling, the sampling device automatically controls the vacuum pump 26 to pump the second tank body 9 and the second pipeline 24 into a negative pressure state (to meet the sampling volume requirements). After sampling, the sampling device will use positive pressure to purge, blow part of the remaining medium in the pipeline into the second tank body 9 (the volume of this part of the medium has been calculated into the sampling volume) and blow other parts of the remaining medium into the first tank body 1. During cleaning, another first tank body 1 is used as a cleaning tank to hold clean water; another second tank body 9 is used as a waste liquid tank to hold cleaning waste liquid. The sampling device relies on positive pressure to push the clean water in the cleaning tank into the first pipeline 3, clean the first pipeline 3, and ensure that there is no residue inside the first pipeline 3. After cleaning, the sampling device automatically turns on the gas purge to clean the remaining liquid (mainly water) in the first pipeline 3 to ensure accurate sampling next time. All cleaning waste liquid will enter the waste liquid tank for sealing, which is convenient for the next step. The utility model controls each electronic component through the controller 55, and can realize functions such as one-key sampling, one-key flushing, and one-key emergency stop, and can realize safe, accurate, and environmentally friendly sampling of toxic and polluting solvents / solutions.
[0027] The utility model is suitable for sampling various toxic and polluting solvents / solutions and can be used indoors or outdoors. The utility model can adopt an integrated control sampling isolation box, integrate and install various components on the box, set a control panel on the box, the control panel displays the operating status information of the sampling device, and the staff can also control the operating status of the sampling device through the control panel. In addition, a power supply is also set on the box (the power supply can be a rechargeable battery), so that the power supply is connected to each electrical component (that is, the controller 55, the vacuum pump 26, the first pressure transmitter 18, the second pressure transmitter 46, the first electric regulating valve 25, the second electric regulating valve 36, the first electromagnetic valve 4, the second electromagnetic valve 7, the third electromagnetic valve 23, the fourth electromagnetic valve 13, the fifth electromagnetic valve 35, the sixth electromagnetic valve 30, the seventh electromagnetic valve 50 and the eighth electromagnetic valve 33 are all electrically connected to the power supply) to provide electrical energy for them. During the use of the utility model, except for the connection or disconnection of the tank body, which needs to be completed manually, the other sampling, flushing and other functions can be automatically operated.
[0028] The utility model has one-key sampling, one-key cleaning and one-key emergency stop functions, which are as follows: (1) One-key sampling: Before sampling, the first tank body 1 and the second tank body 9 are installed on the box body (the first tank body 1 is used as a storage tank to hold the solvent / solution to be sampled, and the second tank body 9 is used as a sampling tank to hold the obtained solvent / solution), which together constitute a sampling device. Then, the one-key sampling function key is pressed, and the sampling device will automatically evacuate, sample and purge, while maintaining the pressure in each tank body to ensure safety when disassembling the tank body and add protective gas to the tank body to prevent contamination by other media. (2) One-key cleaning: After sampling is completed, the first tank body 1 and the second tank body 9 used for sampling are removed from the box body, and then another set of first tank body 1 and second tank body 9 are installed on the box body (the first tank body 1 is used as a cleaning tank to hold clean water, and the second tank body 9 is used as a waste liquid tank to hold cleaning waste liquid), together forming a sampling device, press the one-key cleaning function key, the system will automatically flush and purge the first pipeline 3, while maintaining the pressure in each tank body to ensure safety when disassembling the tank body. (3) One-key emergency stop: In an emergency, press the emergency stop button, and the sampling device will turn off the power of other components while keeping the pressure safety valve open.
[0029] like Figure 1 As shown, the method of using the negative pressure sampling device of the utility model is as follows:
[0030] (1) Sampling
[0031] Before sampling, first accurately and firmly connect the first tank body 1 and the second tank body 9. The first tank body 1 is used as a storage tank to hold the solvent / solution to be sampled, and the second tank body 9 is used as a sampling tank to hold the obtained solvent / solution. Open all the manually controlled stop valves, including the first stop valve 2, the second stop valve 8, the third stop valve 11, the fourth stop valve 17, the fifth stop valve 21, the sixth stop valve 47, the seventh stop valve 44 and the eighth stop valve 40. Press the one-key sampling (purge) button, and the system automatically starts, that is, the power supply is connected to each electrical component to supply power.
[0032] The controller 55 turns on the vacuum pump 26 and opens the first electric regulating valve 25 and the third solenoid valve 23. The vacuum pump 26 draws negative pressure into the second tank body 9 through the second pipeline 24. The vacuum pump 26 discharges the drawn gas through the third exhaust pipeline 27 (the gas can be filtered by the fourth adsorber 28 on the third exhaust pipeline 27). The first pressure transmitter 18 and the first pressure gauge 22 can both measure the pressure of the second pipeline 24 and the second tank body 9. The first pressure transmitter 18 can transmit the measured pressure to the controller 55. The controller 55 then adjusts the pressure of the second pipeline 24 and the second tank body 9 through the first electric regulating valve 25. The staff can also directly read the pressure on the first pressure gauge 22. When the pressure reaches the preset pressure, the controller 55 closes the first electric regulating valve 25 and the third solenoid valve 23. Next, the controller 55 opens the first solenoid valve 4, the second solenoid valve 7, the second electric regulating valve 36, the fifth solenoid valve 35 and the sixth solenoid valve 30, and the inert gas purge gas source 29 delivers the inert gas to the first tank body 1 through the third pipeline 37. Then, under the pressure of the inert gas, the solvent / solution to be sampled in the first tank body 1 enters the second tank body 9 along the first pipeline 3. The one-way valve 38 can only allow the inert gas to flow from the second electric regulating valve 36 to the second adsorber 49 along the third pipeline 37. The second pressure transmitter 46 and the second pressure gauge 42 can both measure the pressure of the third pipeline 37 and the first tank body 1. The second pressure transmitter 46 can transmit the measured pressure to the controller 55, and the controller 55 then adjusts the pressure of the third pipeline 37 and the first tank body 1 through the second electric regulating valve 36. The staff can also directly read the pressure on the second pressure gauge 42.
[0033] After the sampling volume reaches the set value (20ml±5ml), the controller 55 closes the second electric regulating valve 36, the fifth solenoid valve 35 and the first solenoid valve 4, and then opens the eighth solenoid valve 33 and the fourth solenoid valve 13. The inert gas purge gas source 29 transports the inert gas to the first pipeline 3 through the fourth pipeline 34, and blows the solvent / solution in the first pipeline 3 between the eighth connection point 6 and the second tank body 9 into the second tank body 9 to complete the sampling.
[0034] To ensure that the internal pressure of the second tank body 9 remains within 3KPag, after sampling is completed, the controller 55 closes the second solenoid valve 7, and the excess gas will first flow through the first adsorber 10 on the second pipeline 24, and then flow through the first pressure safety valve 14 on the first exhaust pipeline 15 before being discharged into the atmosphere. The first pressure safety valve 14 is a prior art, which can set a pressure value. When the pipeline gas pressure is greater than the pressure value, the first pressure safety valve 14 automatically opens and exhausts. When the pipeline gas pressure is not greater than the pressure value, the first pressure safety valve 14 automatically closes. The first pressure transmitter 18 and the first pressure gauge 22 can measure the pressure of the second pipeline 24 and the second tank body 9 from the third solenoid valve 23 to the second tank body 9. When the pressure of the second tank body 9 reaches the requirement, the first pressure safety valve 14 automatically closes, and the controller 55 closes the fourth solenoid valve 13.
[0035] Afterwards, the controller 55 opens the first solenoid valve 4 and the seventh solenoid valve 50 at the same time, and the inert gas blows the remaining solvent / solution in the first pipeline 3 between the eighth connection point 6 and the first tank body 1 back into the first tank body 1. In order to ensure that the internal pressure of the first tank body 1 is maintained within 3KPag, the excess gas will first flow through the second adsorber 49 on the third pipeline 37, and then flow through the second pressure safety valve 51 and the third adsorber 52 on the second exhaust pipeline 53 before being discharged into the atmosphere. The structure and working principle of the second pressure safety valve 51 are exactly the same as those of the above-mentioned first pressure safety valve 14, and will not be repeated here. The second pressure transmitter 46 and the second pressure gauge 42 can measure the pressure of the third pipeline 37 between the one-way valve 38 and the first tank body 1 and the first tank body 1. After the pressure in the first tank body 1 reaches the requirement, the second pressure safety valve 51 is automatically closed, and the controller 55 closes the first solenoid valve 4, the eighth solenoid valve 33 and the seventh solenoid valve 50. At this time, the one-key sampling mode is fully completed, the first tank body 1 and the second tank body 9 can be removed, and another set of first tank body 1 and second tank body 9 can be installed on the box body. At this time, the new first tank body 1 is used as a cleaning tank (with built-in purified water) and the new second tank body 9 is used as a waste liquid tank.
[0036] (2) Flushing
[0037] After the first tank body 1 serving as a cleaning tank and the second tank body 9 serving as a waste liquid tank are installed, press a flushing button, the controller 55 will open the fifth solenoid valve 35, the second electric regulating valve 36, the first solenoid valve 4, the second solenoid valve 7 and the fourth solenoid valve 13, the inert gas purge gas source 29 delivers the inert gas to the first tank body 1 through the third pipeline 37, under the pressure of the inert gas, the clean water in the first tank body 1 enters the second tank body 9 through the first pipeline 3, in this process, the clean water cleans the residual solvent / solution in the first pipeline 3 and forms waste liquid, and the waste liquid enters the second tank body 9. When the water level in the first tank body 1 is lower than the end of the first pipeline 3 located in the first tank body 1, the gas will enter the first pipeline 3 from the first tank body 1, and then enter the second tank body 9 from the first pipeline 3, that is, the gas will purge the first pipeline 3 again. After about 1 minute, the controller 55 will close the sixth solenoid valve 30, the fifth solenoid valve 35, the second electric regulating valve 36, the first solenoid valve 4 and the second solenoid valve 7, and open the seventh solenoid valve 50. At this time, the sampling device can be exhausted and depressurized through the first pressure safety valve 14 and the second pressure safety valve 51. After the pressure of the sampling device drops to 3KPag, the controller 55 will close the fourth solenoid valve 13 and the seventh solenoid valve 50 to complete the cleaning. At this time, the first tank body 1 and the second tank body 9 can be disassembled.
[0038] (3) Emergency stop
[0039] During the operation, if an accident occurs or a serious hidden danger is found, the emergency stop button can be pressed to interrupt the operation. At this time, the controller 55 will close all other devices and electric control valves except the seventh solenoid valve 50 and the fourth solenoid valve 13. After the controller 55 determines that the pressure has dropped to a safe level, the controller 55 will close the seventh solenoid valve 50 and the fourth solenoid valve 13. At this time, the liquid circuit and gas circuit inside the sampling device are completely closed, and the pressure has also dropped to a safe level, so disassembly, maintenance and other work can be carried out.
[0040] The beneficial effects of the utility model are as follows: the sampling device can realize automatic sampling and cleaning. Except for the installation and disassembly of the tank body and the opening and closing of some manual valves, the rest of the operations are all automatic operations, and the sampling, cleaning, emergency stop and other functions are all one-key operations. After the sampling is completed, the cleaning step can clean up the residual solvent / solution in the first pipeline 3 to avoid the residual contaminated solvent / solution from further contaminating the sampling liquid during the next use, and at the same time avoid the situation of harming others or the environment. At the same time, the automatic purge after the cleaning is completed can also remove the water droplets in the pipeline, and the removed liquid is stored in the waste liquid tank for the next step of processing.
[0041] The outstanding advantages of this utility model are as follows:
[0042] (1) Negative pressure sampling is used during the sampling process to avoid the danger caused by positive pressure sampling in emergency situations;
[0043] (2) Fully automatic operation, one-button function realization, simplifying on-site operation;
[0044] (3) Accurate pressure detection and control to ensure safe on-site operations;
[0045] (4) It can be operated in a mobile manner and is equipped with a mobile power supply with a safety controller 55, so that it can be easily moved between different locations;
[0046] (5) All disassembly and assembly joints and interfaces are quick-install to facilitate on-site operation.
[0047] The controller in the utility model can adopt a DSP (Digital Signal Processor) digital signal processor, an FPGA (Field-Programmable Gate Array) field programmable gate array, an MCU (Microcontroller Unit) system board, a SoC (system on a chip) system board or a PLC (Programmable Logic Controller) minimum system including I / O.
[0048] It should be noted that the directions or positional relationships indicated by terms such as "center", "up", "down", "front", "back", "left", "right", and "middle" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.
[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0050] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.
Claims
1. A negative pressure sampling device, characterized in that: The invention comprises a first tank body, a second tank body, a vacuum pump and a controller, wherein a first pipeline is connected between the first tank body and the second tank body, a first solenoid valve and a second solenoid valve are sequentially connected to the first pipeline along a direction from the first tank body to the second tank body, a second pipeline is connected between the second tank body and the inlet of the vacuum pump, a first adsorber, a third solenoid valve and a first electric regulating valve are sequentially connected to the second pipeline along a direction from the second tank body to the vacuum pump, a first exhaust pipeline, a first pressure transmitter and a first pressure gauge are connected to the second pipeline between the first adsorber and the third solenoid valve, a fourth solenoid valve and a first pressure safety valve are sequentially connected to the first exhaust pipeline along a direction from upstream to downstream, one end of the third pipeline is connected to the first tank body, the other end of the third pipeline is connected to an inert gas purge gas source, and the second adsorber, a third solenoid valve and a first electric regulating valve are sequentially connected to the third pipeline along a direction from the first tank body to the inert gas purge gas source. a one-way valve, a second electric regulating valve, a fifth solenoid valve and a sixth solenoid valve; a second exhaust pipeline, a second pressure transmitter and a second pressure gauge are connected to the third pipeline between the second adsorber and the one-way valve; a seventh solenoid valve, a second pressure safety valve and a third adsorber are sequentially connected to the second exhaust pipeline in a direction from upstream to downstream; a fourth pipeline is connected between the third pipeline and the first pipeline; one end of the fourth pipeline is connected to the third pipeline between the fifth solenoid valve and the sixth solenoid valve; the other end of the fourth pipeline is connected to the first pipeline between the first solenoid valve and the second solenoid valve; an eighth solenoid valve is connected to the fourth pipeline; the vacuum pump, the first pressure transmitter, the second pressure transmitter, the first electric regulating valve, the second electric regulating valve, the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve, the sixth solenoid valve, the seventh solenoid valve and the eighth solenoid valve are all electrically connected to the controller.
2. The negative pressure sampling device according to claim 1, characterized in that: The outlet of the vacuum pump is connected to a third exhaust pipeline, and the third exhaust pipeline is connected to a fourth adsorber.
3. The negative pressure sampling device according to claim 2, characterized in that: The first pipeline is also connected with a first stop valve and a second stop valve. The first stop valve is located on the first pipeline between the first tank body and the first solenoid valve, and the second stop valve is located on the first pipeline between the second solenoid valve and the second tank body.
4. The negative pressure sampling device according to claim 3, characterized in that: The connection point between the first exhaust pipeline and the second pipeline is the first connection point, the first pressure transmitter is connected to the second pipeline through the fifth pipeline, the connection point between the fifth pipeline and the second pipeline is the second connection point, the first pressure gauge is connected to the second pipeline through the sixth pipeline, the connection point between the sixth pipeline and the second pipeline is the third connection point, and the first connection point, the second connection point and the third connection point are arranged in sequence on the second pipeline along the direction from the first adsorber to the third solenoid valve.
5. The negative pressure sampling device according to claim 4, characterized in that: The second pipeline is also connected to a third stop valve, and the third stop valve is located on the second pipeline between the first adsorber and the first connection point. The fifth pipeline is connected to a fourth stop valve, and the sixth pipeline is connected to a fifth stop valve.
6. The negative pressure sampling device according to claim 5, characterized in that: The connection point between the second exhaust pipeline and the third pipeline is the fourth connection point, the second pressure transmitter is connected to the third pipeline through the seventh pipeline, the connection point between the seventh pipeline and the third pipeline is the fifth connection point, the second pressure gauge is connected to the third pipeline through the eighth pipeline, the connection point between the eighth pipeline and the third pipeline is the sixth connection point, and the fourth connection point, the fifth connection point and the sixth connection point are arranged in sequence on the third pipeline along the direction from the second adsorber to the one-way valve.
7. The negative pressure sampling device according to claim 6, characterized in that: The third pipeline is also connected with a sixth stop valve, and the sixth stop valve is located on the third pipeline between the fourth connection point and the fifth connection point. The seventh pipeline is connected with a seventh stop valve, and the eighth pipeline is connected with an eighth stop valve.
8. The negative pressure sampling device according to claim 7, characterized in that: The first pipeline is connected to a first stress-relieving bellows, and the fourth pipeline is connected to a second stress-relieving bellows.