Sampling device

Abstract

The utility model relates to the technical field of sampling, in particular to a sampling device, which comprises a sampling negative pressure pipeline and is characterized by further comprising a sampling pipe, a connecting pipe, a sampling barrel and a vacuum sampling valve, and a sampling hole communicated with the inside and the outside is arranged on the outer side of the lower portion of the sampling negative pressure pipeline. The sampling device is reasonable and compact in structure, the upper end of the sampling barrel and the lower end of the connecting pipe are fixedly installed together in a sealed mode, the vacuum sampling valve is opened, the sampling hole is communicated with the sample outlet hole, the pressure in the sampling barrel and the pressure in the sampling negative-pressure pipeline can be consistent, normal sampling can be achieved, and a material well sampling pipe and the connecting pipe in the sampling negative-pressure pipeline flow into the sampling barrel; external air can be prevented from entering the sampling negative pressure pipeline during sampling to influence material reaction, the process stability can be ensured, the sampling test accuracy can be improved, and the sampling device is convenient to operate, high in sampling efficiency, capable of meeting the requirements of daily sampling operation, simple to operate and convenient to clean, and has a wide application prospect. And the convenience of equipment maintenance and the production stability can be obviously improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sampling, and is a sampling device. Background Art

[0002] In the industrial production process, sampling the esterification reactor is an important step in detecting the esterification rate. The carboxyl index in the esterification monomer has a direct impact on the subsequent polycondensation reaction. However, during normal production of the esterification reactor, the vacuum degree inside the esterification chamber 1 can reach 400mbar, and the vacuum degree of the esterification chamber 2 is 330mbar. There is no conveying equipment from the esterification chamber 1 to the esterification chamber 2, and the material is only discharged by vacuum difference and dead weight. Therefore, when the sampling valve between the esterification chamber 1 and the esterification chamber 2 is opened, the outside is at atmospheric pressure and the inside is at negative pressure. Not only can the material not flow out normally, but air will also be inhaled, destroying the vacuum degree required for the original reaction and affecting the reaction rate. In addition, oxygen entering the reactor will increase side reactions, affecting product quality and the stable operation of the production line. Summary of the Invention

[0003] The utility model provides a sampling device, which overcomes the above-mentioned deficiencies of the prior art and can effectively solve the problem that materials cannot flow out normally during sampling in the existing vacuum pipeline.

[0004] The technical solution of the present utility model is achieved through the following measures: a sampling device, including a sampling negative pressure pipeline, characterized in that it also includes a sampling tube, a connecting tube, a sampling barrel and a vacuum sampling valve, a sampling hole connected inside and outside is provided on the lower outer side of the sampling negative pressure pipeline, a sampling tube is fixedly installed on the outer side of the sampling negative pressure pipeline corresponding to the sampling hole position, a sampling outlet is provided on the lower outer side of the sampling tube that passes through from top to bottom, a connecting tube is fixedly installed on the outer side of the lower part of the sampling tube corresponding to the sampling outlet position, a sampling barrel is detachably fixedly installed on the lower end of the connecting tube, the sampling barrel is in the shape of a tube with a closed lower end and an open upper end, a vacuum sampling valve is provided on the left end of the sampling tube, and the vacuum sampling valve can connect the sampling hole and the sampling outlet or close the sampling hole.

[0005] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:

[0006] The above-mentioned vacuum sampling valve may include a valve stem, a seal, a valve cover and a sealing pressure cover. A mounting ring is fixedly installed on the outer side of the left end of the connecting pipe, a valve stem is provided on the inner side of the connecting pipe, a seal is provided between the outer side of the right part of the valve stem and the inner side of the left end of the connecting pipe, and a sealing pressure cover is provided on the left end of the seal, which is screwed to the inner side of the left end of the connecting pipe. The sealing pressure cover is sleeved on the outer side of the valve stem, a valve cover is fixedly installed on the left end of the mounting ring, and the valve cover is screwed to the outer side of the left part of the valve stem. A handle is fixedly installed on the left end of the valve stem corresponding to the left position of the valve cover. When the handle is rotated in a clockwise direction, the right end of the valve stem moves to the right to close the sampling hole, and when the handle is rotated in a counterclockwise direction, the right end of the valve stem moves to the left to connect the sampling hole and the sample outlet hole.

[0007] The lower inner wall of the sampling hole is tangent to the lower inner wall of the sampling negative pressure pipeline, and the right end of the valve stem is an arc surface that matches the inner wall of the sampling negative pressure pipeline.

[0008] The outside of the above-mentioned sampling negative pressure pipeline can be equipped with a sleeve, and the outside of the left part of the sleeve corresponding to the sampling tube position is provided with a mounting hole that passes through the left and right sides, and the outside of the right part of the sampling tube is installed in the mounting hole. The outside of the sleeve corresponding to the mounting hole position is fixedly installed with a protective pipe that is installed on the outside of the sampling tube, and the left end of the protective pipe is fixedly installed with the right end of the mounting ring platform. The outside of the lower part of the protective pipe corresponding to the connecting pipe position is provided with a communicating hole that communicates up and down, and the outer side of the upper part of the connecting pipe is fixedly installed with the inner wall of the communicating hole, and a heating pipe is fixedly connected between the rear part of the protective pipe and the rear part of the sleeve.

[0009] A collecting cover which is sleeved on the outer side of the lower part of the sampling tube can be fixedly installed on the outer side of the lower part of the protective tube corresponding to the position of the connecting hole. The collecting cover is in a cone shape with a small upper part and a large lower part. An upper connecting flange is fixedly installed on the lower end of the collecting cover. A discharge pipe is fixedly installed between the upper end of the upper connecting flange and the lower end of the sampling tube. A lower connecting flange which is detachably installed with the upper connecting flange is fixedly installed on the upper end of the sampling tube.

[0010] The discharge pipe may be in a tapered shape with a smaller top and a larger bottom.

[0011] A plurality of partitions may be fixedly installed at intervals along the circumferential direction on the outer side of the sampling tube, and a distance is provided between the side of each partition away from the outer wall of the sampling tube and the inner side of the sleeve.

[0012] The utility model has a reasonable and compact structure, and the upper end of the sampling cylinder and the lower end of the connecting pipe are sealed and fixed together. The vacuum sampling valve is opened, and the sampling hole and the sampling outlet are connected, which can achieve the consistency of pressure in the sampling cylinder and the sampling negative pressure pipeline. Normal sampling, the material well sampling tube and the connecting pipe in the sampling negative pressure pipeline flow into the sampling cylinder, and it can also avoid external air entering the sampling negative pressure pipeline during sampling, affecting the material reaction, which can ensure the stability of the process and increase the accuracy of sampling and testing. The sampling device is easy to operate and has high sampling efficiency, can meet the requirements of daily sampling operations, has the advantages of simple operation and easy cleaning, and can significantly improve the convenience of equipment maintenance and production stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attachment Figure 1 This is a schematic diagram of the main cross-sectional structure of the best embodiment of the utility model.

[0014] Attachment Figure 2 For attachment Figure 1 Schematic diagram of the cross-sectional zoom structure at AA in the middle.

[0015] Attachment Figure 3 For attachment Figure 2 Schematic diagram of the enlarged cross-section structure at DD in the middle.

[0016] Attachment Figure 4 For attachment Figure 1 Schematic diagram of the enlarged structure at point B in the middle.

[0017] Attachment Figure 5 For attachment Figure 1 Schematic diagram of the enlarged structure at point C in the middle.

[0018] The codes in the accompanying drawings are: 1 for the sampling negative pressure pipe, 2 for the sampling tube, 3 for the connecting pipe, 4 for the sampling cylinder, 5 for the valve stem, 6 for the seal, 7 for the valve cover, 8 for the sealing cover, 9 for the handle, 10 for the mounting ring, 11 for the sleeve, 12 for the protective tube, 13 for the collecting cover, 14 for the upper connecting flange, 15 for the lower connecting flange, 16 for the discharge pipe, 17 for the partition, and 18 for the heating pipe. DETAILED DESCRIPTION

[0019] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0020] In this utility model, for the convenience of description, the relative position relationship of each component is described based on the Figure 1 The positional relationships of front, back, top, bottom, left, and right are described in the layout of the manual. Figure 1 The layout direction is determined by the

[0021] The present invention will be further described below in conjunction with the embodiments and accompanying drawings:

[0022] Example 1: As shown in the attached Figure 1 、 2 As shown, the sampling device includes a sampling negative pressure pipeline 1, and also includes a sampling tube 2, a connecting tube 3, a sampling barrel 4 and a vacuum sampling valve. A sampling hole connected inside and outside is provided on the lower outer side of the sampling negative pressure pipeline 1. The sampling tube 2 is fixedly installed on the outer side of the sampling negative pressure pipeline 1 corresponding to the sampling hole position. A sampling outlet that passes through from top to bottom is provided on the lower outer side of the sampling tube 2. A connecting tube 3 is fixedly installed on the lower outer side of the sampling tube 2 corresponding to the sample outlet position. A sampling barrel 4 is detachably fixedly installed on the lower end of the connecting tube 3. The sampling barrel 4 is in the shape of a tube with a closed lower end and an open upper end. A vacuum sampling valve is provided on the left end of the sampling tube 2. The vacuum sampling valve can connect the sampling hole and the sample outlet hole or close the sampling hole.

[0023] When in use, the upper end of the sampling tube 4 and the lower end of the connecting tube 3 are sealed and fixed together, the vacuum sampling valve is opened, and the sampling hole and the sampling outlet hole are connected, so that the pressure in the sampling tube 4 can be consistent with that in the sampling negative pressure pipe 1. During normal sampling, the material well sampling tube 2 and the connecting tube 3 in the sampling negative pressure pipe 1 flow into the sampling tube 4. It can also avoid external air entering the sampling negative pressure pipe 1 during sampling, affecting the material reaction, ensuring the stability of the process, and increasing the accuracy of sampling and testing. The sampling device is easy to operate and has high sampling efficiency, which can meet the requirements of daily sampling operations. It has the advantages of simple operation and easy cleaning, and can significantly improve the convenience of equipment maintenance and production stability.

[0024] The above sampling device can be further optimized and / or improved according to actual needs:

[0025] Example 2: As an optimization of the above example, as shown in the attached Figure 1 、 2 As shown in Figures 4 and 5, the vacuum sampling valve includes a valve stem 5, a sealing member 6, a valve cover 7 and a sealing gland 8. A mounting ring 10 is fixedly installed on the outer side of the left end of the connecting pipe 3, a valve stem 5 is provided on the inner side of the connecting pipe 3, a sealing member 6 is provided between the outer side of the right part of the valve stem 5 and the inner side of the left end of the connecting pipe 3, a sealing gland 8 is provided on the left end of the sealing member 6 and is screwed to the inner side of the left end of the connecting pipe 3, the sealing gland 8 is sleeved on the outer side of the valve stem 5, a valve cover 7 is fixedly installed on the left end of the mounting ring 10, the valve cover 7 is screwed to the outer side of the left part of the valve stem 5, a handle 9 is fixedly installed on the left end of the valve stem 5 corresponding to the left position of the valve cover 7, when the handle 9 is rotated in a clockwise direction, the right end of the valve stem 5 moves to the right to close the sampling hole, and when the handle 9 is rotated in a counterclockwise direction, the right end of the valve stem 5 moves to the left to connect the sampling hole and the sample outlet hole.

[0026] During use, the vacuum sampling valve can also be an existing well-known technology. By switching the vacuum sampling valve, the sampling negative pressure pipe 1 and the sampling tube 4 are connected and closed, reducing the difficulty of sampling operation. It can also ensure the sealing performance between the sampling tube 4 and the sampling negative pressure pipe 1 during sampling, avoiding leakage during the sampling process, and avoiding leakage from affecting the material in the sampling negative pressure pipe 1. According to needs, the seal 6 is an existing well-known sealing filler.

[0027] Example 3: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the lower inner wall of the sampling hole is tangent to the lower inner wall of the sampling negative pressure pipeline 1, and the right end of the valve stem 5 is an arc surface that matches the inner wall of the sampling negative pressure pipeline 1.

[0028] During use, the lower inner wall of the sampling hole is tangent to the lower inner wall of the sampling negative pressure pipe 1, that is, the distance between the central axis of the sampling hole and the sampling negative pressure pipe 1 is the same as the difference between the radius of the inner wall of the sampling negative pressure pipe and the radius of the sampling hole. This facilitates the rapid outflow of the material from the sampling hole, reduces the resistance of the material flowing into the sampling hole, and increases the sampling speed. The right end of the valve stem 5 is an arc surface that matches the inner wall of the sampling negative pressure pipe 1. When the valve stem 5 moves to the right to close the sampling hole, the right end of the valve stem 5 is flush with the inner wall of the sampling negative pressure pipe 1. This can reduce the resistance of the valve stem 5 to the material flowing in the sampling negative pressure pipe 1 and reduce the impact of the vacuum sampling device on logistics.

[0029] Example 4: As an optimization of the above embodiment, as shown in the attached Figure 1 、 2 As shown, a sleeve 11 is sleeved on the outside of the sampling negative pressure pipe 1, and a mounting hole that passes through left and right is provided on the outside of the left part of the sleeve 11 corresponding to the position of the sampling tube 2, and the outside of the right part of the sampling tube 2 is sleeved in the mounting hole. A protective tube 12 sleeved on the outside of the sampling tube 2 is fixedly installed on the outside of the sleeve 11 corresponding to the position of the mounting hole, and the left end of the protective tube 12 is fixedly installed with the right end of the mounting ring 10. A communicating hole that communicates up and down is provided on the outside of the lower part of the protective tube 12 corresponding to the position of the connecting tube 3, and the outer side of the upper part of the connecting tube 3 is fixedly installed with the inner wall of the communicating hole. A heating pipe 18 is fixedly connected between the rear part of the protective tube 12 and the rear part of the sleeve 11.

[0030] During use, through such a setting, high-temperature fluid is injected into the sleeve 11, which can heat the sampling negative pressure pipe 1, the sampling valve and the sampling tube 2. Injecting heat transfer oil of about 235 degrees into the sleeve 11 can prevent the esterification monomer with a melting point of 210 degrees from solidifying in the sampling negative pressure pipe 1, the sampling valve and the sampling tube 2, thereby facilitating the normal sampling of materials. According to needs, a protective layer is provided on the outside of the sleeve 11, which can not only avoid scalding accidents, but also have a heat insulation effect. A nameplate is fixedly installed on the upper side of the mounting ring 10.

[0031] Example 5: As an optimization of the above embodiment, as shown in the attached Figure 1 、 2 As shown, a collecting cover 13 is fixedly installed on the outer side of the lower part of the protective tube 12 corresponding to the position of the connecting hole, and is sleeved on the outer side of the lower part of the sampling tube 2. The collecting cover 13 is conical in shape with a small upper part and a large lower part. An upper connecting flange 14 is fixedly installed on the lower end of the collecting cover 13, and a discharge pipe 16 is fixedly installed between the upper end of the upper connecting flange 14 and the lower end of the sampling tube 2. A lower connecting flange 15 is fixedly installed on the upper end of the sampling cylinder 4, which is detachably mounted with the upper connecting flange 14.

[0032] According to the requirements, the upper connecting flange 14 and the lower connecting flange 15 are both DN50 and PN16 stainless steel flanges. A 1221 stainless steel and graphite composite reinforcement pad is set between the upper connecting flange 14 and the lower connecting flange 15. The upper connecting flange 14 and the lower connecting flange 15 are fixed together by a number of 8.8-grade high-strength bolts evenly spaced along the circumference. The material of the discharge pipe 16 and the sampling tube 4 are both 304 stainless steel.

[0033] During use, such a setting facilitates the disassembly and assembly between the sampling cylinder 4 and the sampling tube 2. When sampling, the sealing performance between the sampling cylinder 4 and the lower end of the sampling tube 2 can be guaranteed. This can not only ensure the vacuum degree in the sampling negative pressure pipe 1 and avoid affecting the vacuum degree in the sampling negative pressure pipe 1, but also facilitate the installation between the sampling cylinder 4 and the sampling tube 2 each time sampling is taken, thereby reducing the difficulty of sampling operation.

[0034] Example 6: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the feed tube 16 is tapered with a small top and a large bottom.

[0035] During use, such a setting facilitates the installation of the sampling cylinder 4, improves the connection strength between the upper connecting flange 14 and the lower connecting flange 15, ensures that the sampling cylinder 4 is sealed with the sampling tube 2 during sampling, avoids the vacuum degree of the sampling negative pressure pipeline 1, and allows the logistics to quickly flow into the sampling cylinder 4 through the opened vacuum sampling valve.

[0036] Example 7: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, a plurality of partitions 17 are fixedly installed at intervals along the circumferential direction on the outer side of the sampling tube 2 , and a distance is provided between the side of each partition 17 away from the outer wall of the sampling tube 2 and the inner side of the sleeve 11 .

[0037] During use, such a setting facilitates the welding and fixation between the sampling tube 2 and the partition 17, and also facilitates the installation and maintenance of the sleeve 11. A distance is provided between the side of each partition 17 away from the outer wall of the sampling tube 2 and the inner side of the sleeve 11. In this way, high-temperature fluid is passed into the sleeve 11 to heat the material in the sampling tube 2, thereby avoiding blockage when the temperature of the material in the sampling tube 2 drops, and ensuring normal sampling of the material.

[0038] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

[0039] The usage process of the best embodiment of the present utility model: When sampling, the sampling personnel first wear a splash-proof mask and scald-proof gloves, then clean the inside of the sampling tube 4 and the inner walls of the connecting pipe 3 and the discharge pipe 16, check whether the sealing gasket is intact, and install the sampling tube 4 after confirming that it is intact, tighten the upper connecting flange 14 and the lower connecting flange 15, after the sampling tube 4 is installed, open the vacuum sampling valve, wait for about 30 seconds, so that the material fills the entire sampling tube 4, close the vacuum sampling valve, remove the sampling tube 4, pour the esterification monomer into the sample delivery container, clean the sampling tube 4, and restore the installation.

Claims

1. A sampling device, comprising a sampling negative pressure pipeline, characterized in that it also includes a sampling tube, a connecting tube, a sampling cylinder and a vacuum sampling valve, a sampling hole connected inside and outside is provided on the outer side of the lower portion of the sampling negative pressure pipeline, a sampling tube is fixedly installed on the outer side of the sampling negative pressure pipeline corresponding to the position of the sampling hole, a sampling outlet is provided on the outer side of the lower portion of the sampling tube, which passes through from top to bottom, a connecting tube is fixedly installed on the outer side of the lower portion of the sampling tube corresponding to the position of the sampling outlet, a sampling cylinder is detachably fixedly installed on the lower end of the connecting tube, the sampling cylinder is in the shape of a tube with a closed lower end and an open upper end, a vacuum sampling valve is provided on the left end of the sampling tube, and the vacuum sampling valve can connect the sampling hole and the sampling outlet or close the sampling hole.

2. The sampling device according to claim 1, characterized in that The vacuum sampling valve includes a valve stem, a seal, a valve cover and a sealing cover. A mounting ring is fixedly installed on the outer side of the left end of the connecting pipe, a valve stem is provided on the inner side of the connecting pipe, a seal is provided between the outer side of the right part of the valve stem and the inner side of the left end of the connecting pipe, and a sealing cover is provided on the left end of the seal which is screwed to the inner side of the left end of the connecting pipe. The sealing cover is sleeved on the outer side of the valve stem, a valve cover is fixedly installed on the left end of the mounting ring, and the valve cover is screwed to the outer side of the left part of the valve stem. A handle is fixedly installed on the left end of the valve stem corresponding to the left position of the valve cover. When the handle is rotated in a clockwise direction, the right end of the valve stem moves to the right to close the sampling hole, and when the handle is rotated in a counterclockwise direction, the right end of the valve stem moves to the left to connect the sampling hole and the sample outlet hole.

3. The sampling device according to claim 2, characterized in that The lower inner wall of the sampling hole is tangent to the lower inner wall of the sampling negative pressure pipeline, and the right end of the valve stem is an arc surface that matches the inner wall of the sampling negative pressure pipeline.

4. The sampling device according to claim 2 or 3, characterized in that A sleeve is provided on the outside of the sampling negative pressure pipe. A mounting hole that passes through left and right is provided on the outside of the left part of the sleeve corresponding to the sampling tube position. The outside of the right part of the sampling tube is sleeved in the mounting hole. A protective pipe sleeved on the outside of the sampling tube is fixedly installed on the outside of the sleeve corresponding to the mounting hole position. The left end of the protective pipe is fixedly installed together with the right end of the mounting ring platform. A communicating hole that communicates up and down is provided on the outside of the lower part of the protective pipe corresponding to the connecting pipe position. The outer side of the upper part of the connecting pipe is fixedly installed together with the inner wall of the communicating hole. A heating pipe is fixedly connected between the rear part of the protective pipe and the rear part of the sleeve.

5. The sampling device according to claim 4, characterized in that A collecting cover is fixedly installed on the outer side of the lower part of the sampling tube at the position of the connecting hole, and the collecting cover is in a conical shape with a small upper part and a large lower part. An upper connecting flange is fixedly installed on the lower end of the collecting cover, and a discharge pipe is fixedly installed between the upper end of the upper connecting flange and the lower end of the sampling tube. A lower connecting flange is fixedly installed on the upper end of the sampling tube, and the lower connecting flange is detachably installed with the upper connecting flange.

6. The sampling device according to claim 5, characterized in that The discharge pipe is tapered with a small top and a large bottom.

7. The sampling device according to claim 4, characterized in that A plurality of partitions are fixedly installed at intervals along the circumferential direction on the outer side of the sampling tube, and a distance is provided between the side surface of each partition away from the outer wall of the sampling tube and the inner side of the sleeve.

8. The sampling device according to claim 5 or 6, characterized in that A plurality of partitions are fixedly installed at intervals along the circumferential direction on the outer side of the sampling tube, and a distance is provided between the side surface of each partition away from the outer wall of the sampling tube and the inner side of the sleeve.

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