Polyester resin on-line sampling system

Abstract

The utility model relates to resin production equipment field especially, more particularly to a kind of polyester resin on-line sampling system;Including: dilution kettle, sampling pump and sample collector;The utility model passes through the sampling mode of closed circulation, reduces VOC unorganized emission and environmental protection risk, while can prevent outside impurity into system;Through the process that sampling pump extracts material and returns dilution kettle, cycle process is established, makes material high-speed flow, maintains material flow state stability, not only reduces material blockage, also improves sampling mode, while speeds up sampling efficiency;The utility model also uses telescopic sampling tube, can carry out sampling detection to the product of different positions of kettle top, middle and bottom, ensures that sampling is uniform, is helpful to improve product quality;Residual liquid in collection box is backflowed to dilution kettle by the bottom valve of collection box, reduces material loss, improves economic benefit.

Description

Technical Field

[0001] This utility model relates to the field of resin production equipment, and in particular to an online sampling system for polyester resin. Background Technology

[0002] The sampling system is a key piece of equipment used to obtain samples of the medium in pipelines or equipment. Polyester resin requires sampling after each stage of the reaction process, and currently, the main sampling method is through a manual sampling valve at the bottom of the vessel. However, the current manual sampling valve resin sampling process has the following problems: The existing sampling process is a traditional open sampling method, requiring the exhaust fan to be turned on and manual sampling to be performed through the bottom sampling valve. A waste liquid collection tank is placed at the sampling point to collect splashed material. This sampling process increases fugitive VOC emissions, causing environmental pollution. The waste liquid in the collection tank cannot be effectively recovered, resulting in material loss and increased manufacturing costs. Furthermore, the existing sampling valve uses intermittent sampling, leaving residual liquid inside the valve that cannot be completely drained, easily leading to accumulation and blockage. This results in low sampling efficiency and inaccurate liquid test data, affecting product quality testing. Additionally, the existing sampling valve can only sample from the bottom of the vessel, limiting the sampling range and making it impossible to assess the uniformity of product mixing in the upper and middle sections, making it difficult to guarantee quality test data. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing an online sampling system for polyester resin.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] An online sampling system for polyester resin is provided, comprising: a dilution vessel, a sampling pump, and a sample collector;

[0006] The sampling end of the sampling pump is connected to the outlet pipeline at the top of the dilution vessel, and the output end of the sampling pump is connected to the first inlet pipeline at the top of the dilution vessel; the sample collector is located between the output end of the sampling pump and the first inlet of the dilution vessel, and the output end of the sample collector is connected to the second inlet pipeline at the top of the dilution vessel.

[0007] Preferably, the sampling end of the sampling pump is connected to the sampling outlet end at the top of the dilution vessel via a retractable sampling tube.

[0008] More preferably, the bottom end of the retractable sampling tube extends into the interior of the dilution vessel.

[0009] Preferably, a first pneumatic switch valve and a Y-type filter are sequentially installed on the pipeline between the sample outlet of the dilution vessel and the sampling end of the sampling pump.

[0010] Preferably, the sampling pump is connected to a compressed air delivery system via a pipeline; a second pneumatic switch valve and a check valve are sequentially installed on the pipeline between the sampling pump and the compressed air delivery system.

[0011] Preferably, a first ball valve, a second ball valve, and a third ball valve are sequentially provided on the pipeline between the output end of the sampling pump and the first inlet end of the dilution vessel.

[0012] More preferably, the sample collector is located between the first ball valve and the second ball valve.

[0013] More preferably, a fourth ball valve is provided on the pipeline between the first ball valve and the feed end of the sample collector, and a third pneumatic switch valve is provided on the pipeline between the discharge end of the sample collector and the second sample inlet of the dilution vessel.

[0014] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0015] This invention reduces fugitive VOC emissions and environmental risks through a closed-loop sampling method, while preventing external impurities from entering the system. The process of extracting material through a sampling pump and returning it to the dilution vessel establishes a circulation process, ensuring high-speed material flow and maintaining stable material flow. This not only reduces material blockage but also improves the sampling method and accelerates sampling efficiency. Furthermore, this invention employs a retractable sampling tube, allowing for sampling and testing of products at different locations (top, middle, and bottom) of the vessel, ensuring uniform sampling and contributing to improved product quality. Residual liquid in the collection tank is returned to the dilution vessel through a bottom valve, reducing material loss and improving economic efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the basic structure of an online polyester resin sampling system in one embodiment of the present invention.

[0017] The reference numerals in the figure include:

[0018] 1. Dilution vessel; 2. Sampling pump; 3. Sample collector; 4. Telescopic sampling tube; 5. First pneumatic switch valve; 6. Y-type filter; 7. Second pneumatic switch valve; 8. Check valve; 9. First ball valve; 10. Second ball valve; 11. Third ball valve; 12. Fourth ball valve; 13. Third pneumatic switch valve. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0022] Example

[0023] This embodiment provides an online sampling system for polyester resin, including: a dilution vessel 1, a sampling pump 2, and a sample collector 3;

[0024] The sampling end of the sampling pump 2 is connected to the sampling outlet end at the top of the dilution vessel 1 via a retractable sampling tube 4, the bottom end of which extends into the interior of the dilution vessel 1. A first pneumatic switch valve 5 and a Y-type filter 6 are sequentially installed on the pipeline between the sampling outlet end of the dilution vessel 1 and the sampling end of the sampling pump 2. The output end of the sampling pump 2 is connected to the first inlet end pipeline at the top of the dilution vessel 1. A first ball valve 9, a second ball valve 10, and a third ball valve 11 are sequentially installed on the pipeline between the output end of the sampling pump 2 and the first inlet end of the dilution vessel 1. The sample collector 3 is located between the first ball valve 9 and the second ball valve 10. A fourth ball valve 12 is installed on the pipeline between the first ball valve 9 and the inlet end of the sample collector 3. A third pneumatic switch valve 13 is installed on the pipeline between the outlet end of the sample collector 3 and the second inlet end of the dilution vessel 1. The sampling pump 2 is connected to a compressed air delivery system via a pipeline; a second pneumatic switch valve 7 and a check valve 8 are sequentially installed on the pipeline between the sampling pump 2 and the compressed air delivery system.

[0025] The workflow is as follows:

[0026] During sampling, the first ball valve 9, the second ball valve 10, and the third ball valve 11 are normally open. The dilution vessel 1 is stirred, and the first pneumatic switch valve 5 and the second pneumatic switch valve 7 are opened. The second pneumatic switch valve 7 provides compressed air to the sampling pump 2. The retractable sampling tube 4 extracts the sample from the dilution vessel 1. The length of the retractable sampling tube 4 can be adjusted as needed to extract samples from various locations in the dilution vessel 1. After the retractable sampling tube 4 extracts the sample, the sample passes through the sampling pump 2 and flows back into the dilution vessel 1 from the first inlet end of the dilution vessel 1 to form a circulation system. After waiting for 3 minutes, the fourth ball valve 12 is opened, and the sample enters the sample collector 3, completing the sampling.

[0027] After sampling is completed, the second pneumatic switch valve 7 is closed, the sampling pump 2 stops working, the third pneumatic switch valve 13 is opened, so that the sample in the sample collector 3 flows into the dilution vessel 1 through the second inlet end of the dilution vessel 1, and finally the first pneumatic switch valve 5 and the third pneumatic switch valve 13 are closed.

[0028] In summary, this invention reduces fugitive VOC emissions and environmental risks through a closed-loop sampling method, while preventing external impurities from entering the system. The process of extracting material by the sampling pump and returning it to the dilution vessel establishes a circulation process, ensuring high-speed material flow and maintaining stable material flow. This not only reduces material blockage but also improves the sampling method and accelerates sampling efficiency. Furthermore, this invention employs a retractable sampling tube, allowing for sampling and testing of products at different locations (top, middle, and bottom) of the vessel, ensuring uniform sampling and contributing to improved product quality. Residual liquid in the collection tank is returned to the dilution vessel through a bottom valve, reducing material loss and improving economic efficiency.

[0029] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An online sampling system for polyester resin, characterized in that, include: A dilution vessel (1), a sampling pump (2), and a sample collector (3); The sampling end of the sampling pump (2) is connected to the sample outlet pipeline at the top of the dilution vessel (1), and the output end of the sampling pump (2) is connected to the first inlet pipeline at the top of the dilution vessel (1); the sample collector (3) is located between the output end of the sampling pump (2) and the first inlet of the dilution vessel (1), and the output end of the sample collector (3) is connected to the second inlet pipeline at the top of the dilution vessel (1).

2. The online polyester resin sampling system of claim 1, wherein The sampling end of the sampling pump (2) is connected to the sampling outlet end at the top of the dilution vessel (1) via a retractable sampling tube (4).

3. The online sampling system for polyester resin according to claim 2, characterized in that, The bottom end of the retractable sampling tube (4) extends into the interior of the dilution vessel (1).

4. The polyester resin on-line sampling system according to claim 1, wherein A first pneumatic switch valve (5) and a Y-type filter (6) are sequentially installed on the pipeline between the sample outlet of the dilution vessel (1) and the sampling outlet of the sampling pump (2).

5. The online sampling system for polyester resin according to claim 1, characterized in that, The sampling pump (2) is connected to a compressed air delivery system via a pipeline; a second pneumatic switch valve (7) and a check valve (8) are sequentially installed on the pipeline between the sampling pump (2) and the compressed air delivery system.

6. The online sampling system for polyester resin according to claim 1, characterized in that, A first ball valve (9), a second ball valve (10), and a third ball valve (11) are sequentially installed on the pipeline between the output end of the sampling pump (2) and the first inlet end of the dilution vessel (1).

7. The online sampling system for polyester resin according to claim 6, characterized in that, The sample collector (3) is located between the first ball valve (9) and the second ball valve (10).

8. The online sampling system for polyester resin according to claim 7, characterized in that, A fourth ball valve (12) is provided on the pipeline between the first ball valve (9) and the feed end of the sample collector (3), and a third pneumatic switch valve (13) is provided on the pipeline between the discharge end of the sample collector (3) and the second sample inlet of the dilution vessel (1).

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