A negative pressure sampling device

Abstract

The application provides a negative pressure sampling device, comprising a sampling tank, a negative pressure structure, a sampling structure and a sample outlet structure; the negative pressure structure comprises a first pipeline, a negative pressure pump and a first valve body arranged on the first pipeline, one end of the first pipeline is communicated with an upper end opening of the sampling tank, and the other end is connected with the negative pressure pump; the sampling structure comprises a second pipeline, a hose, a third pipeline and a counterweight arranged on the third pipeline, one end of the second pipeline is communicated with a side end opening of the sampling tank, one end of the third pipeline is connected with a material to be sampled, and the hose is communicated with the second pipeline and the third pipeline; and the sample outlet structure comprises a fourth pipeline and a second valve body arranged on the fourth pipeline. The negative pressure sampling device can simplify the sampling difficulty in the production process and improve the sampling efficiency and safety.

Description

Technical Field

[0001] This application relates to the field of chemical production sampling technology, specifically to a negative pressure sampling device. Background Technology

[0002] In chemical production, sample analysis is a crucial means of quality control for chemical products. Therefore, timely sampling and analysis of products during production is of great significance. By sampling and analyzing in a timely manner, various parameters and changes in the production process can be monitored in real time, such as the quality of raw materials, the degree of reaction, and the purity of the product. It also allows for the timely detection of abnormalities in the production process, such as raw material contamination, equipment malfunction, and operational errors, thereby ensuring that the produced products meet established quality standards. For example, in the production of AC foaming agent, it is necessary to sample and analyze the AC foaming agent in the reactor before discharge to determine the degree of reaction and product quality.

[0003] In production sites, sampling and analysis are mostly conducted manually by using a sampling spoon to extract liquid from inside the reaction vessel. This sampling method requires a high level of experience and skill, making sampling difficult and unable to prevent leakage of volatile raw materials during sampling, thus posing a certain degree of danger. Utility Model Content

[0004] The purpose of this invention is to solve the problems of high sampling difficulty and low sampling efficiency in the production process in the background art, and to provide a negative pressure sampling device that can simplify the sampling difficulty in the production process, improve sampling efficiency and the safety of sampling operation.

[0005] To achieve the above objectives, the specific technical solution of the negative pressure sampling device of this application is as follows: A negative pressure sampling device includes a sampling container, a negative pressure structure, a sampling structure, and a sample dispensing structure. The sampling container has openings at its upper, side, and lower ends. The negative pressure structure includes a first pipe, a negative pressure pump, and a first valve body disposed on the first pipe. One end of the first pipe is connected to the upper opening of the sampling container, and the other end is connected to the negative pressure pump. The sampling structure includes a second pipe, a hose, a third pipe, and a counterweight disposed on the third pipe. One end of the second pipe is connected to the side opening of the sampling container, and one end of the third pipe is connected to the material to be sampled. The hose connects the second pipe and the third pipe. The sample dispensing structure includes a fourth pipe and a second valve body disposed on the fourth pipe.

[0006] As an improvement to the above-mentioned sampling tank in this application, in order to prevent the material to be sampled from overflowing into the negative pressure structure during sampling, the sampling tank includes a first sampling component and a second sampling component. The second sampling component is connected to the upper end of the first sampling component through a connecting flange. A float ball is provided inside the second sampling component, and the diameter of the float ball is larger than the diameter of the upper opening of the sampling tank.

[0007] As an improvement to the above-mentioned negative pressure sampling device in this application, one end of the fourth pipe is connected to the lower opening of the sampling tank, and the other end is connected to the flexible tube.

[0008] As an improvement to the negative pressure sampling device described above, the interfaces of the first pipe, the second pipe, the third pipe, the fourth pipe, and the hose are movably connected by quick connectors.

[0009] As an improvement to the above-mentioned negative pressure sampling device in this application, the negative pressure sampling device further includes a sampling meter, which includes, but is not limited to, at least one of a scale, a liquid level sensor, and a pressure gauge.

[0010] As an improvement to the above-mentioned negative pressure sampling device in this application, the negative pressure sampling device further includes a controller, which is connected to the negative pressure pump, the first valve body, the second valve body and the sampling meter.

[0011] The beneficial effects of this application are as follows: 1. This application features a negative pressure structure and employs a sampling method at a pressure lower than atmospheric pressure. Compared to ordinary sampling, sampling from a high-flow-rate pipeline can accelerate the response time, reduce the possibility of external factors interfering with the sample, limit the operator's contact with hazardous substances, and improve the efficiency and safety of the sampling process.

[0012] 2. This application improves the structure of the sampling container by incorporating a float with a diameter larger than the upper opening inside. This prevents contamination of the negative pressure structure when the sample flow rate is too high, thereby further improving the safety of the sampling process.

[0013] 3. This application features quick-connect couplings at the interfaces of each pipe, employing advanced sealing technology to ensure the sealing performance of the pipe connections. Furthermore, the quick-connect couplings are easy to operate, significantly reducing the time required for installation and maintenance and improving work efficiency.

[0014] In addition to the technical problems solved by this utility model, the technical features constituting the technical solution, and the advantages brought about by the technical features of these technical solutions as described above, other technical problems that this utility model can solve, other technical features contained in the technical solution, and the advantages brought about by these technical features will be further explained in detail with reference to the accompanying drawings. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a negative pressure sampling device according to an embodiment of this application; Explanation of reference numerals in the attached figures: 10. Sampling container; 11. First sampling component; 12. Second sampling component; 13. Float; 14. Mesh plate; 20. Negative pressure structure; 21. First pipeline; 22. Negative pressure pump; 23. First valve body; 30. Sampling structure; 31. Second pipeline; 32. Hose; 33. Third pipeline; 34. Counterweight; 40. Sample dispensing structure; 41. Fourth pipeline; 42. Second valve body; 43. Quick connector. Detailed Implementation

[0016] The following will be combined with the appendix Figure 1 The embodiments of the technical solution of this application are described in detail below. The following embodiments are only used to more clearly illustrate the technical solution of this application, and are therefore merely examples and should not be used to limit the scope of protection of this application. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0017] To address the problems existing in the prior art, this application provides a schematic diagram of a negative pressure sampling device. The negative pressure sampling device includes: a sampling tank 10, a negative pressure structure 20, a sampling structure 30, and a sample outlet structure 40. The negative pressure structure 20 includes a first pipe 21, a negative pressure pump 22, and a first valve body 23 disposed on the first pipe 21. One end of the first pipe 21 is connected to the upper opening of the sampling tank 10, and the other end is connected to the negative pressure pump 22. The sampling structure 30 includes a second pipe 31, a flexible hose 32, a third pipe 33, and a counterweight 34 disposed on the third pipe 33. One end of the second pipe 31 is connected to the side opening of the sampling tank 10, one end of the third pipe 33 is connected to the material to be sampled, and the flexible hose 32 connects the second pipe 31 and the third pipe 33. The sample outlet structure 40 includes a fourth pipe 41 and a second valve body 42 disposed on the fourth pipe 41.

[0018] like Figure 1 As shown, in this embodiment, the sampling container 10 has a cylindrical design, and openings are provided at the top, side, and bottom of the sampling container 10. Therefore, the top and bottom of the sampling container 10 can be designed in a funnel shape to facilitate the entry and exit of fluid. The upper opening is used to connect to the negative pressure structure 20, the side opening is used to connect to the sampling structure 30, and the lower opening is used to connect to the sample outlet structure 40. The side opening can be at a certain angle to the horizontal plane. Optionally, the surface of the sampling container 10 can be provided with scale markings so that operators can observe the samples in a timely manner.

[0019] In this embodiment, the negative pressure structure 20 includes a first pipe 21, one end of which is connected to the upper opening of the sampling tank 10. The other end of the first pipe 21 is connected to a negative pressure pump 22, which draws air from the sampling tank 10 to create a negative pressure environment inside the tank. A first valve body 23 is installed on the first pipe 21 to control the flow of fluid within the pipe. By adjusting the opening and closing degree of the first valve body 23, the pressure level in the negative pressure sampling device can be effectively controlled, preventing damage to the device due to excessively high or low pressure.

[0020] Optionally, the above-mentioned negative pressure pump 22 can be selected as a manual negative pressure pump 22 or an electric negative pressure pump 22 according to the production environment.

[0021] In this embodiment, the sampling structure 30 consists of a second pipe 31, a flexible hose 32, and a third pipe 33. One end of the second pipe 31 is connected to the side opening of the sampling vessel 10, and one end of the third pipe 33 is connected to the material to be sampled. The flexible hose 32 connects the second pipe 31 and the third pipe 33. The third pipe 33 extends into the reactor through the opening to sample the material that has completed the reaction in the reactor. The flexible hose 32 has a certain tension, so its length can be adjusted during sampling to sample materials at different heights / positions in the reactor. To maintain the stability of the flexible hose 32 during sampling, the connection between the flexible hose 32 and the third pipe 33 can be connected to a counterweight 34 installed on the third pipe 33 to prevent the accuracy of sampling from being affected by the swinging of the flexible hose 32 during sampling.

[0022] In this embodiment, the sample dispensing structure 40 includes a fourth pipe 41 and a second valve body 42 disposed on the fourth pipe 41. Specifically, the second valve body 42 is installed on the fourth pipe 41 and is used to control the sample to flow out of the sampling tank 10 for sample analysis after sampling is completed. It can also prevent the material to be sampled from being sucked into the dispensing structure during sampling.

[0023] In one implementation, one end of the fourth pipe 41 is connected to the lower opening of the sampling container 10, and the other end is connected to the flexible hose 32. Specifically, the connection between the fourth pipe 41 and the flexible hose 32 makes the installation of the negative pressure sampling device to the analysis device more convenient after sampling. For example, after the negative pressure sampling device completes the sampling operation, the operator can disconnect the connection between the flexible hose 32 and the third pipe 33, and directly connect the flexible hose 32 to the analysis device, thereby inputting the material sample in the sampling container 10 into the analysis device through the sample outlet structure 40 and the flexible hose 32, thereby improving the efficiency of sample transfer. Furthermore, the connection between the fourth pipe 41 and the flexible hose 32 can also promptly recover excess material samples.

[0024] Optionally, the second pipe 31 and the fourth pipe 41 can be connected to the hose 32 using a connector (e.g., a tee).

[0025] The implementation process of the negative pressure sampling device in this embodiment is as follows: Step 1: Establish a negative pressure environment. Open the first valve body 23 and start the negative pressure pump 22 to extract air from the sampling tank 10 through the first pipe 21, creating a negative pressure environment. This step ensures that the material to be sampled can be drawn into the sampling tank 10 without external interference during sampling.

[0026] Step 2: Connect the sampling source. Connect one end of the third pipe 33 to the material to be sampled in the reactor, ensuring a stable and airtight connection to prevent leakage during sampling. Check that the second valve body 42 is in the closed position.

[0027] Step 3: Operate the sampling structure 30. Connect the hose 32 to the counterweight 34. The material to be sampled is drawn into the sampling container 10 through the third pipe 33, the hose 32, and the second pipe 31.

[0028] Step 4: Sample Storage and Transfer. After sample collection, close the first valve 23 and store the sample in a sealed container 10. When analyzing the sample, disconnect the hose 32 from the third pipe 33, connect the hose 32 to the inlet of the sample analysis device, and open the second valve 42 to discharge the sample for subsequent analysis and testing.

[0029] The negative pressure sampling device of this embodiment includes a sampling tank 10, a negative pressure structure 20, a sampling structure 30, and a sample outlet structure 40. It adopts a sampling method with a pressure lower than atmospheric pressure. Compared with ordinary sampling, by sampling from a high-flow-rate pipeline, the response time can be accelerated, the possibility of external factors interfering with the sample can be reduced, the contact between the operator and harmful substances can be limited, and the efficiency and safety of the sampling process can be improved.

[0030] Based on the above embodiments, please continue to refer to Figure 1 In one embodiment, the sampling tank 10 includes a first sampling component 11 and a second sampling component 12. The second sampling component 12 is connected to the upper end of the first sampling component 11 via a connecting flange. A float ball 13 is provided on the mesh plate 14 of the second sampling component 12. The diameter of the float ball 13 is larger than the diameter of the upper opening of the sampling tank 10.

[0031] Specifically, the float 13 is designed to float within the sampling tank 10. Since the float 13 can automatically adjust its position according to the liquid level, when the sampling medium reaches a certain height, the float 13 rises and seals the upper opening of the sampling tank 10, stopping sampling promptly. The float 13 also provides some protection for the negative pressure sampling device. In the event of excessive power or malfunction of the negative pressure pump 22, if the sample flow rate in the pipeline is too high during sampling, the first valve body 23 located in the first pipeline 21 may not close in time. In this case, the float 13, under the suction force of the negative pressure pump 22, can quickly seal the upper opening of the sampling tank 10, preventing sample contamination of the first pipeline 21 and thus improving the safety of the sampling process.

[0032] Based on the above embodiments, please continue to refer to Figure 1 In one embodiment, the interfaces of the first pipe 21, the second pipe 31, the third pipe 33, the fourth pipe 41, and the hose 32 are movably connected via quick connectors 43. Specifically, the first pipe 21 and the negative pressure pump 22, the second pipe 31 and the hose 32, the third pipe 33 and the hose 32, and the fourth pipe 41 and the hose 32 can all be movably connected via quick connectors 43. Quick connectors 43 have excellent sealing performance, effectively preventing gas or liquid leakage that may occur during sampling, reducing environmental pollution and risks to operators. Furthermore, the design of quick connectors 43 makes connecting the pipes faster and simpler, supporting rapid adjustment of the configuration of the negative pressure sampling device in changing production environments, enabling it to adapt to different working conditions and sampling needs. For example, after sampling, the discharge mechanism quickly disconnects from the feeding mechanism, thereby connecting to the sample analysis device for sample analysis.

[0033] Based on the above embodiments, in one embodiment, the negative pressure sampling device further includes a sampling meter, which includes, but is not limited to, at least one of a scale, a level sensor, and a pressure gauge. Specifically, the scale and level sensor can monitor and adjust the sample volume in real time during the sampling process to ensure that the sampling achieves the expected accuracy. The level sensor can issue a warning when the sampling tank 10 is insufficient, avoiding waste or potential safety risks caused by overflow. The pressure gauge can monitor pressure changes throughout the system, ensuring operation within a safe pressure range and preventing device damage or safety accidents caused by abnormal pressure.

[0034] Based on the above embodiments, in one embodiment, the negative pressure sampling device further includes a controller connected to the negative pressure pump 22, the first valve body 23, the second valve body 42, and the sampling meter. Optionally, the controller can be a programmable logic controller (PLC) or a distributed control system (DCS). During implementation, the controller can be used to receive and process data from the sampling meter, and to control the opening or closing of each valve and the negative pressure pump 22. Through these connections and controls, precise sampling process control can be achieved, simplifying the sampling process in production, improving sampling efficiency, and enabling real-time monitoring of the sampling process, thereby improving the safety of the sampling operation.

[0035] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] In the description of the embodiments of this application, the technical terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0037] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "set", "equipped with", "connected", and "installed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A negative pressure sampling device, characterized in that, include: Sampling container (10), negative pressure structure (20), sampling structure (30) and sample discharging structure (40); The negative pressure structure (20) includes a first pipe (21), a negative pressure pump (22), and a first valve body (23) disposed on the first pipe (21). One end of the first pipe (21) is connected to the upper opening of the sampling tank (10), and the other end is connected to the negative pressure pump (22). The sampling structure (30) includes a second pipe (31), a hose (32), a third pipe (33), and a counterweight (34) disposed on the third pipe (33). One end of the second pipe (31) is connected to the side opening of the sampling tank (10), one end of the third pipe (33) is connected to the material to be sampled, and the hose (32) connects the second pipe (31) and the third pipe (33). The sample output structure (40) includes a fourth pipe (41) and a second valve body (42) disposed on the fourth pipe (41).

2. The negative pressure sampling device as described in claim 1, characterized in that, The sampling tank (10) includes a first sampling component (11) and a second sampling component (12). The second sampling component (12) is connected to the upper end of the first sampling component (11) through a connecting flange. A float (13) is provided on the mesh plate (14) of the second sampling component (12). The diameter of the float (13) is larger than the diameter of the upper opening of the sampling tank (10).

3. The negative pressure sampling device as described in claim 1, characterized in that, The fourth pipe (41) is connected at one end to the lower opening of the sampling tank (10) and at the other end to the flexible tube (32).

4. The negative pressure sampling device as described in claim 3, characterized in that, The interfaces of the first pipe (21), the second pipe (31), the third pipe (33), the fourth pipe (41) and the hose (32) are movably connected by quick connectors (43).

5. The negative pressure sampling device as described in claim 1, characterized in that, The negative pressure sampling device also includes a sampling meter, which includes, but is not limited to, at least one of a scale, a liquid level sensor, and a pressure gauge.

6. The negative pressure sampling device as described in claim 5, characterized in that, The negative pressure sampling device also includes a controller, which is connected to the negative pressure pump (22), the first valve body (23), the second valve body (42) and the sampling meter.

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