High-pressure online sampler for carbon dioxide-based polycarbonate polyol

Abstract

The utility model provides a carbon dioxide based polycarbonate polyol high pressure on-line sampler which comprises a sampling pipeline, a cylinder body and a discharge pipe, the sampling pipeline is fixedly communicated with the cylinder body through a feed valve, the discharge pipe is fixedly communicated with the discharge pipe through a discharge valve, one side of the cylinder body is provided with a pressure relief mechanism, and the other side of the cylinder body is provided with a pressure relief valve. A clamping mechanism is arranged on the surface of the discharging pipe; the pressure relief mechanism comprises a conveying pipe fixedly communicated to one side of the barrel, a pressure relief replacement opening is fixedly formed in the surface of the conveying pipe, and a waste gas pipe and a nitrogen pipe are arranged on one side of the conveying pipe. According to the high-pressure online sampler for the carbon dioxide-based polycarbonate polyol, the pressure relief mechanism is arranged to replace gas, so that a sample is prevented from being polluted by air, clean sampling is ensured, safety accidents caused by direct contact between flammable and explosive chemicals and the air are prevented, and the sampling safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon dioxide-based polycarbonate polyols, in particular to a high-pressure online sampler for carbon dioxide-based polycarbonate polyols. Background Art

[0002] CO2-based polycarbonate polyols are polycarbonates made from carbon dioxide. During the production process, a series of process product tests are required, necessitating sampling to obtain the reaction liquid within the pipeline. The pipeline pressure during the CO2-based polycarbonate polyol reaction is above 4.8 MPa, and the reaction temperature is relatively mild, around 80°C. The sampled liquid primarily contains polyols, propylene oxide, propylene carbonate, and carbon dioxide, among other media. Propylene oxide is a flammable and explosive hazardous chemical under key regulatory supervision.

[0003] Currently, most samplers are suitable for normal pressure or low pressure conditions, but are not suitable for pressurized sampling of high-pressure pipelines. The high-pressure sampling process can cause splashing accidents and propylene oxide leakage, causing fire accidents, which is not conducive to user safety. Therefore, we propose a carbon dioxide-based polycarbonate polyol high-pressure online sampler to solve this problem. Utility Model Content

[0004] The purpose of the utility model is to provide a high-pressure online sampler for carbon dioxide-based polycarbonate polyol to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A high-pressure online sampler for carbon dioxide-based polycarbonate polyol comprises a sampling pipe, a barrel, and a discharge pipe. The sampling pipe is fixedly connected to the barrel via a feed valve, and the discharge pipe is fixedly connected to the discharge pipe via a discharge valve. A pressure relief mechanism is provided on one side of the barrel, and a clamping mechanism is provided on the surface of the discharge pipe.

[0007] The pressure relief mechanism includes a transmission pipe fixedly connected to one side of the cylinder, a pressure relief replacement port fixedly provided on the surface of the transmission pipe, an exhaust pipe and a nitrogen pipe provided on one side of the transmission pipe, and the exhaust pipe and the nitrogen pipe are fixedly connected to the transmission pipe through an exhaust gas discharge valve and a nitrogen valve respectively.

[0008] Preferably, the clamping mechanism includes a support block fixedly connected to the surface of the discharge pipe, the bottom of the support block is fixedly connected to two positioning blocks, one side of the positioning block is threadedly connected to a threaded rod, one side of the positioning block is provided with a threaded hole for use with the threaded rod, one end of the threaded rod is fixedly connected to a twisting block, the other end of the threaded rod is provided with a bearing, and is rotatably connected to a moving block through the bearing, a telescopic slot is provided at the bottom of the moving block, the inside of the telescopic slot is slidably connected to the telescopic block, the bottom of the telescopic block is fixedly connected to an arc-shaped clamping block, and an adjustment mechanism is provided on one side of the moving block.

[0009] Preferably, the adjustment mechanism includes an L-shaped frame fixedly connected to one side of the moving block, one side of the L-shaped frame is fixedly connected to a traction block, one side of the traction block is fixedly connected to a traction rod, one end of the traction rod passes through one side of the L-shaped frame and is fixedly connected to an extrusion block, one side of the extrusion block is fixedly connected to an adjustment rod, one end of the adjustment rod passes through the interior of the telescopic slot, and one side of the telescopic block is provided with an adjustment hole for use with the adjustment rod.

[0010] Preferably, a spring is sleeved on the surface of the traction rod, one end of the spring is fixedly connected to one side of the extrusion block, and the other end of the spring is fixedly connected to one side of the L-shaped frame.

[0011] Preferably, the number of the adjustment holes is several and they are evenly distributed on one side of the telescopic block.

[0012] Preferably, a protective pad is fixedly connected to one side of the arc-shaped clamping block, and the material of the protective pad is rubber.

[0013] Preferably, a sliding block is fixedly connected to the top of the moving block, and a sliding groove for use with the sliding block is provided at the bottom of the supporting block.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The utility model sets a pressure relief mechanism. Before sampling, the feed valve and the discharge valve are in a closed state. Open the nitrogen valve connected to the pressure relief displacement port to pressurize the nitrogen in the nitrogen pipe into the cylinder. Then close the nitrogen valve and open the exhaust gas discharge valve to discharge the gas from the exhaust pipe to release the pressure. Repeat this process three times. Then slowly open the feed valve to allow the fluid in the sampling pipe to enter the cylinder. Close the feed valve, place the sampling bottle at the bottom of the discharge pipe, slowly open the discharge valve to allow the liquid in the cylinder to flow into the sampling bottle, close the discharge valve, and the sampling process ends. Through gas replacement, air contamination of the sample is avoided, the sampling is clean, and the flammable and explosive chemicals are prevented from directly contacting the air to cause safety accidents, thereby improving the safety of sampling.

[0016] 2. The present invention provides a clamping mechanism, which enables the mouth of the sampling bottle to be docked with the discharge pipe. By rotating the twisting block, the threaded rod is driven to rotate inside the threaded hole. The threaded rod drives the bearing and the moving block to move along the trajectory of the sliding block and the sliding groove toward the side close to the sampling bottle. The moving block drives the telescopic block and the arc-shaped clamping block to move toward the side close to the sampling bottle until the protective pad on the arc-shaped clamping block is in close contact with the surface of the sampling bottle. Clamping the sampling bottle with two arc-shaped clamping blocks can effectively improve the stability of the sampling bottle and prevent the sampling bottle from tipping over, which would affect the safety of sampling.

[0017] 3. The present invention incorporates an adjustment mechanism that allows the traction block to be pulled, which in turn drives the traction rod, extrusion block, and adjustment rod to move, allowing the adjustment rod to leave the positioning hole and release the restriction on the telescopic block. The position of the telescopic block and the arc-shaped clamping block can then be adjusted along the trajectory of the telescopic slot. Once the desired position is reached, the traction block is released, and the spring force generated by the spring pushes the extrusion block and adjustment rod back into their original position, allowing the adjustment rod to enter the corresponding adjustment hole. This achieves the desired clamping position adjustment, enabling the arc-shaped clamping block to accurately clamp the sample bottle in the middle, improving clamping stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0019] Figure 2 A perspective view of the main structure of the utility model;

[0020] Figure 3 For this utility model Figure 2 A partial enlarged view of point A in the middle;

[0021] Figure 4 A three-dimensional diagram of the clamping mechanism of the present invention;

[0022] Figure 5 It is a three-dimensional diagram of the adjustment mechanism of the utility model.

[0023] In the figure: 1. Sampling pipe; 2. Cylinder; 3. Discharge pipe; 4. Feed valve; 5. Discharge valve; 6. Transfer pipe; 7. Pressure relief replacement port; 8. Exhaust pipe; 9. Nitrogen valve; 10. Support block; 11. Positioning block; 12. Threaded rod; 13. Threaded hole; 14. Twisting block; 15. Bearing; 16. Moving block; 17. Telescopic slot; 18. Telescopic block; 19. Arc clamping block; 20. L-shaped frame; 21. Traction block; 22. Traction rod; 23. Extrusion block; 24. Adjustment rod; 25. Adjustment hole; 26. Spring; 27. Protective pad; 28. Sliding block; 29. ​​Sliding slot; 30. Nitrogen pipe; 31. Exhaust discharge valve. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] See also Figure 1 , the utility model provides a technical solution: Example 1

[0026] A high-pressure online sampler for carbon dioxide-based polycarbonate polyols, comprising a sampling pipe 1, a barrel 2, and a discharge pipe 3. The sampling pipe 1 is fixedly connected to the barrel 2 via a feed valve 4, and the discharge pipe 3 is fixedly connected to the discharge pipe 3 via a discharge valve 5. A pressure relief mechanism is provided on one side of the barrel 2, and a clamping mechanism is provided on the surface of the discharge pipe 3.

[0027] The pressure relief mechanism includes a transmission pipe 6 fixedly connected to one side of the cylinder 2, and a pressure relief replacement port 7 is fixedly provided on the surface of the transmission pipe 6. An exhaust pipe 8 and a nitrogen pipe 30 are provided on one side of the transmission pipe 6. The exhaust pipe 8 and the nitrogen pipe 30 are fixedly connected to the transmission pipe 6 through an exhaust gas discharge valve 31 and a nitrogen valve 9 respectively.

[0028] In this embodiment, considering that current samplers are mostly suitable for atmospheric or low-pressure conditions, they are not suitable for high-pressure pipeline pressure sampling. High-pressure sampling can cause splashing accidents and propylene oxide leakage, leading to fire accidents, which is detrimental to user safety. Therefore, a pressure relief mechanism is provided. Before sampling, the feed valve 4 and discharge valve 5 are closed. The nitrogen valve 9 connected to the pressure relief displacement port 7 is opened to allow nitrogen in the nitrogen pipe 30 to pressurize the cylinder 2. Then, after closing the nitrogen valve 9, the exhaust gas discharge valve 31 is opened to discharge the gas through the exhaust pipe 8, relieving the pressure. This process is repeated three times. The feed valve 4 is then slowly opened to allow the fluid in the sampling pipe 1 to enter the cylinder 2. The feed valve 4 is closed, and the sampling bottle is placed at the bottom of the discharge pipe 3. The discharge valve 5 is slowly opened to allow the liquid in the cylinder 2 to flow into the sampling bottle. The discharge valve 5 is then closed, and the sampling process is completed. This gas replacement prevents air contamination of the sample, ensures the sample is clean, and prevents flammable and explosive chemicals from directly contacting the air and causing safety accidents, thereby improving the safety of the sampling process.

[0029] The problem is solved by considering that the current samplers are mostly suitable for normal pressure or low pressure conditions, and are not suitable for pressurized sampling of high-pressure pipelines. The high-pressure sampling process may cause splashing accidents and propylene oxide leakage causing fire accidents, which is not conducive to user safety.

[0030] It should be noted that:

[0031] 1. The nozzle, cylinder 2 and valve are all made of stainless steel to avoid carbon steel contamination of the sample;

[0032] 2. Design pressure is 10MPa, which can meet working conditions above 4.8MPa. Example 2

[0033] refer to Figure 2 、 Figure 3 and Figure 4 : On the basis of Example 1, this embodiment takes into account that when the liquid is discharged from the discharge pipe 3, if the sampling bottle is not restricted, the sampling bottle will fall over, which will also affect the safety of sampling. The clamping mechanism in this application includes a support block 10 fixedly connected to the surface of the discharge pipe 3, and the bottom of the support block 10 is fixedly connected to two positioning blocks 11, one side of the positioning block 11 is threadedly connected to a threaded rod 12, and one side of the positioning block 11 is provided with a threaded hole 13 used in conjunction with the threaded rod 12, one end of the threaded rod 12 is fixedly connected to a twisting block 14, and the other end of the threaded rod 12 is provided with a bearing 15, and is rotatably connected to a moving block 16 through the bearing 15, and a telescopic groove 17 is provided at the bottom of the moving block 16, and a telescopic block 18 is slidably connected inside the telescopic groove 17, and an arc-shaped clamping block 19 is fixedly connected to the bottom of the telescopic block 18, and an adjustment mechanism is provided on one side of the moving block 16.

[0034] In this embodiment, it is considered that when the liquid is discharged from the discharge pipe 3, if the sampling bottle is not restricted, the sampling bottle will fall over, which will also affect the safety of sampling. Therefore, by setting up a clamping mechanism, the mouth of the sampling bottle can be connected to the discharge pipe 3. By rotating the twisting block 14, the threaded rod 12 is driven to rotate inside the threaded hole 13. The threaded rod 12 will drive the bearing 15 and the moving block 16 to move along the trajectory of the sliding block 28 and the sliding groove 29 to the side close to the sampling bottle. The moving block 16 will drive the telescopic block 18 and the arc-shaped clamping block 19 to move to the side close to the sampling bottle until the protective pad 27 on the arc-shaped clamping block 19 is in close contact with the surface of the sampling bottle. Clamping the sampling bottle by two arc-shaped clamping blocks 19 can effectively improve the stability of the sampling bottle and prevent the sampling bottle from falling over, which affects the safety of sampling.

[0035] The invention solves the problem that when the liquid is discharged from the discharge pipe 3, if the sampling bottle is not restricted, the sampling bottle may fall over, which will also affect the safety of sampling.

[0036] A protective pad 27 is fixedly connected to one side of the arc-shaped clamping block 19 , and the material of the protective pad 27 is rubber.

[0037] In this embodiment, the protective pad 27 is provided to prevent the arc-shaped clamping block 19 from directly clamping the sampling bottle rigidly, thereby preventing the sampling bottle from being damaged.

[0038] Preferably, a sliding block 28 is fixedly connected to the top of the moving block 16 , and a sliding groove 29 for use with the sliding block 28 is formed at the bottom of the supporting block 10 .

[0039] In this embodiment, by providing the sliding block 28 and the sliding groove 29, when the threaded rod 12 rotates to transmit the moving block 16, the moving block 16 is restricted to move only along the track of the sliding block 28 and the sliding groove 29, thereby limiting the moving track. Example 3

[0040] refer to Figure 3 、 Figure 4 and Figure 5 : On the basis of Example 2, this embodiment takes into account the different heights of the sampling bottles. If the clamping position cannot be in the middle of the sampling bottle, it will affect the stability of the clamping. The adjustment mechanism in this application includes an L-shaped frame 20 fixedly connected to one side of the moving block 16, and one side of the L-shaped frame 20 is fixedly connected to a traction block 21, and one side of the traction block 21 is fixedly connected to a traction rod 22. One end of the traction rod 22 passes through one side of the L-shaped frame 20 and is fixedly connected to an extrusion block 23. One side of the extrusion block 23 is fixedly connected to an adjustment rod 24, and one end of the adjustment rod 24 passes through the interior of the telescopic slot 17. One side of the telescopic block 18 is provided with an adjustment hole 25 for use with the adjustment rod 24.

[0041] In this embodiment, the heights of the sampling bottles are different. If the clamping position cannot be in the middle of the sampling bottle, it will affect the stability of the clamping. Therefore, by providing an adjustment mechanism, the traction block 21 can be pulled, and the traction block 21 can drive the traction rod 22, the squeezing block 23 and the adjustment rod 24 to move, so that the adjustment rod 24 leaves the interior of the positioning hole, and the restriction on the telescopic block 18 is released. Thereafter, the positions of the telescopic block 18 and the arc-shaped clamping block 19 are adjusted along the trajectory of the telescopic slot 17. After reaching the appropriate position, the traction block 21 is released, and the elastic force generated by the spring 26 will push the squeezing block 23 and the adjustment rod 24 to reset, so that the adjustment rod 24 enters the corresponding adjustment hole 25. In this way, the clamping position is adjusted, so that the arc-shaped clamping block 19 can be accurately clamped in the middle of the sampling bottle, thereby improving the stability of the clamping.

[0042] The invention solves the problem that the clamping stability will be affected if the clamping position cannot be in the middle of the sampling bottle due to the different heights of the sampling bottles.

[0043] A spring 26 is sleeved on the surface of the traction rod 22 . One end of the spring 26 is fixedly connected to one side of the extrusion block 23 , and the other end of the spring 26 is fixedly connected to one side of the L-shaped frame 20 .

[0044] In this embodiment, by providing the spring 26 , when the traction block 21 is released, the elastic force generated by the spring 26 can drive the moving block 16 and the adjusting rod 24 to move, thereby achieving a reset effect.

[0045] Preferably, there are a plurality of adjustment holes 25 , which are evenly distributed on one side of the telescopic block 18 .

[0046] In this embodiment, by providing a plurality of adjustment holes 25 , the telescopic block 18 can be quickly fixed by allowing the adjustment rod 24 to enter the corresponding adjustment hole 25 after the position of the telescopic block 18 is adjusted.

[0047] Working principle: By pulling the traction block 21, the traction block 21 drives the traction rod 22, the extrusion block 23, and the adjustment rod 24 to move, so that the adjustment rod 24 leaves the positioning hole and releases the restriction on the telescopic block 18. Then, the position of the telescopic block 18 and the arc-shaped clamping block 19 is adjusted along the trajectory of the telescopic slot 17. After reaching the appropriate position, the traction block 21 is released, and the elastic force generated by the spring 26 pushes the extrusion block 23 and the adjustment rod 24 to reset, so that the adjustment rod 24 enters the corresponding adjustment hole 25. This achieves the effect of adjusting the clamping position, so that the arc-shaped clamping block 19 can be accurately clamped in the middle of the sampling bottle;

[0048] After docking the mouth of the sampling bottle with the discharge tube 3, the screw block 14 is rotated to drive the threaded rod 12 to rotate inside the threaded hole 13. The threaded rod 12 will drive the bearing 15 and the moving block 16 to move along the trajectory of the sliding block 28 and the sliding groove 29 toward the side close to the sampling bottle. The moving block 16 will drive the telescopic block 18 and the arc-shaped clamping block 19 to move toward the side close to the sampling bottle until the protective pad 27 on the arc-shaped clamping block 19 is in close contact with the surface of the sampling bottle. Clamping the sampling bottle with two arc-shaped clamping blocks 19 can effectively improve the stability of the sampling bottle and prevent the sampling bottle from tipping over, which affects the safety of sampling.

[0049] Before sampling, the feed valve 4 and the discharge valve 5 are in the closed state. Open the nitrogen valve 9 connected to the pressure relief replacement port 7 to allow the nitrogen in the nitrogen pipe 30 to pressurize the cylinder 2. Then close the nitrogen valve 9 and open the exhaust gas discharge valve 31 to discharge the gas from the exhaust gas pipe 8 to release the pressure. Repeat this process three times. Then slowly open the feed valve 4 to allow the fluid in the sampling pipe 1 to enter the cylinder 2. Close the feed valve 4 and slowly open the discharge valve 5 to allow the liquid in the cylinder 2 to flow into the sampling bottle. Close the discharge valve 5 and the sampling process is completed. Through gas replacement, air contamination of the sample is avoided, the sampling is clean, and the safety of sampling is improved by preventing flammable and explosive chemicals from directly contacting the air and causing safety accidents.

[0050] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-pressure online sampler for carbon dioxide-based polycarbonate polyols, characterized by: It comprises a sampling pipe (1), a cylinder (2) and a discharge pipe (3), wherein the sampling pipe (1) is fixedly connected to the cylinder (2) via a feed valve (4), and the discharge pipe (3) is fixedly connected to the discharge pipe (3) via a discharge valve (5). A pressure relief mechanism is provided on one side of the cylinder (2), and a clamping mechanism is provided on the surface of the discharge pipe (3); The pressure relief mechanism comprises a transmission pipe (6) fixedly connected to one side of the cylinder (2), a pressure relief replacement port (7) fixedly provided on the surface of the transmission pipe (6), an exhaust pipe (8) and a nitrogen pipe (30) provided on one side of the transmission pipe (6), and the exhaust pipe (8) and the nitrogen pipe (30) are fixedly connected to the transmission pipe (6) via an exhaust gas discharge valve (31) and a nitrogen valve (9), respectively.

2. A high-pressure online sampler for carbon dioxide-based polycarbonate polyol according to claim 1, characterized in that: The clamping mechanism comprises a support block (10) fixedly connected to the surface of the discharge pipe (3), the bottom of the support block (10) is fixedly connected to two positioning blocks (11), one side of the positioning block (11) is threadedly connected to a threaded rod (12), one side of the positioning block (11) is provided with a threaded hole (13) for use with the threaded rod (12), one end of the threaded rod (12) is fixedly connected to a twisting block (14), the other end of the threaded rod (12) is provided with a bearing (15), and is rotatably connected to a moving block (16) through the bearing (15), the bottom of the moving block (16) is provided with a telescopic groove (17), the inside of the telescopic groove (17) is slidably connected to a telescopic block (18), the bottom of the telescopic block (18) is fixedly connected to an arc-shaped clamping block (19), and one side of the moving block (16) is provided with an adjustment mechanism.

3. A high-pressure online sampler for carbon dioxide-based polycarbonate polyol according to claim 2, characterized in that: The adjustment mechanism comprises an L-shaped frame (20) fixedly connected to one side of the moving block (16), a traction block (21) fixedly connected to one side of the L-shaped frame (20), a traction rod (22) fixedly connected to one side of the traction block (21), one end of the traction rod (22) passing through one side of the L-shaped frame (20) and fixedly connected to an extrusion block (23), one side of the extrusion block (23) fixedly connected to an adjustment rod (24), one end of the adjustment rod (24) passing through the interior of the telescopic slot (17), and an adjustment hole (25) for use with the adjustment rod (24) is opened on one side of the telescopic block (18).

4. A high-pressure online sampler for carbon dioxide-based polycarbonate polyol according to claim 3, characterized in that: A spring (26) is sleeved on the surface of the traction rod (22), one end of the spring (26) is fixedly connected to one side of the extrusion block (23), and the other end of the spring (26) is fixedly connected to one side of the L-shaped frame (20).

5. The high-pressure online sampler for carbon dioxide-based polycarbonate polyol according to claim 3, characterized in that: The number of the adjustment holes (25) is several and evenly distributed on one side of the telescopic block (18).

6. The high-pressure online sampler for carbon dioxide-based polycarbonate polyol according to claim 2, characterized in that: A protective pad (27) is fixedly connected to one side of the arc-shaped clamping block (19), and the material of the protective pad (27) is rubber.

7. The high-pressure online sampler for carbon dioxide-based polycarbonate polyol according to claim 2, characterized in that: The top of the moving block (16) is fixedly connected to a sliding block (28), and the bottom of the supporting block (10) is provided with a sliding groove (29) for use with the sliding block (28).

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