Improved structure of sampling steel cylinder

Abstract

The utility model discloses an improved type sampling steel bottle structure relates to gas airtight sampling technical field, aims at solving traditional sampling steel bottle operation is complicated, and the problem such as high risk of leakage, easy residual pollution. Its in conventional sampling steel bottle import and export valve jumper pipeline middle section is equipped with tee structure, tee branch installs special sampling needle valve and standardization sampling interface, and the interface can adapt to the detection aluminum foil bag or other subpackaging container commonly used in laboratory. Through the structure, can utilize sample's own pressure difference and form closed circulation, realize the bypass airtight circulation of jumper pipeline, ensure medium replacement, and can open sampling needle valve and complete airtight secondary sampling without repeatedly installing steel bottle, still can rely on airtight sampler's own purging and emptying process, and the residual medium in steel bottle and pipeline is swept out thoroughly, prevents pollution. The structure reduces the frequency of steel bottle plug -in, does not need to rely on external equipment, improves the operation safety and the convenience, reduces time and manpower cost, adapts to multiple scenes, enhances sampling reliability.

Description

Technical Field

[0001] This utility model relates to the field of gas closed sampling technology, and in particular to an improved sampling cylinder structure. Background Technology

[0002] Traditionally, gas sampling cylinders are connected to and installed via an interface corresponding to a sealed sampler for sampling. The cylinder is then removed and handed over to the quality inspection department for secondary sampling and repackaging before the samples are finally tested and analyzed.

[0003] This sampling process has the following limitations:

[0004] 1. The operation is complicated and the sampling conditions are limited: After the sample is taken from the gas cylinder, it is usually necessary to rely on external equipment for repackaging. For example, when testing aluminum foil bags, the gas cylinder and aluminum foil bags cannot be directly connected for repackaging. They must be connected by special diameter conversion joints and connecting hoses of specified dimensions. The reliance on external equipment is high and it is not easy to produce. The operation process is cumbersome and the airtightness is difficult to guarantee.

[0005] 2. Repeated sampling increases the risk of leakage: The sealing of the sampling cylinder and the sealed sampler interface mainly depends on the tight fit of the metal sealing surfaces of the two. However, from sampling to secondary sample dispensing, the cylinder needs to be frequently inserted and removed. During this process, the interface seal is very easy to wear and fail, which increases the risk of media leakage.

[0006] 3. Residual contamination: The residual gas in the sampling cylinder is difficult to completely remove during the secondary dispensing process, or it may require external equipment to replace and clean the cylinder. Either way, it may contaminate subsequent samples.

[0007] This utility model proposes an improvement solution to address the above-mentioned pain points. While ensuring sample quality, it optimizes the sampling process and method, saves the gas cylinder repackaging step, reduces the frequency of gas cylinder insertion and removal, greatly reduces the time and labor costs of sampling operations, and improves the overall operational safety and convenience. Utility Model Content

[0008] To address the shortcomings of existing technologies, this utility model provides an improved sampling cylinder structure, which solves the technical problems of traditional gas sampling cylinders, such as complicated operation during secondary sampling and dispensing, reliance on external equipment, high risk of leakage due to frequent insertion and removal, and easy contamination of subsequent samples by residual gas.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] An improved sampling cylinder structure includes a cylinder body, an inlet valve, an outlet valve, a jumper pipe, a three-way structure, a sampling needle valve, and a sampling interface;

[0011] The inlet valve and outlet valve are respectively installed at the inlet and outlet of the cylinder body;

[0012] The cross-pipe connects the inlet valve and the outlet valve;

[0013] The tee structure is located in the middle section of the cross-connection line;

[0014] The sampling needle valve and sampling interface are installed sequentially on the branch of the three-way structure.

[0015] Preferably, the sampling interface is a standardized interface, and the sampling interface is connected to an aluminum foil bag.

[0016] Preferably, the sampling needle valve controls the speed and on / off state of the sample being introduced from the cross-connection line through the sampling interface into the aluminum foil bag.

[0017] Preferably, the bypass pipeline works in conjunction with the inlet valve, outlet valve, and tee structure to form a bypass closed loop, which fully replaces the medium in the cylinder body and the inlet and outlet pipelines.

[0018] Preferably, the sampling needle valve and sampling interface are detachable.

[0019] Preferably, the material and size of the jumper pipe are compatible with the inlet and outlet pipes of the cylinder body.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] This utility model's improved sampling cylinder structure achieves closed secondary sampling by incorporating a three-way structure, a dedicated sampling needle valve, and a standardized sampling interface in the middle section of the inlet and outlet valve cross-pipeline. This eliminates the need for repeated cylinder installation or removal, reducing wear on the interface sealing surface, significantly lowering the risk of media leakage, and improving operational safety. The closed sampler's own purging and venting process thoroughly removes residual gas from the cylinder and pipeline, effectively preventing sample contamination and ensuring sample purity. The standardized sampling interface is directly compatible with commonly used laboratory aluminum foil bags and other dispensing containers, eliminating the need for external equipment and special adapters. This simplifies secondary sampling and dispensing steps, significantly improving operational convenience while reducing time and labor costs. The sampling needle valve and sampling interface are common accessories, economical, practical, and easy to manufacture, disassemble, and replace, improving equipment compatibility and economy. Suitable for various sampling scenarios, this design comprehensively enhances the efficiency and reliability of gas sampling operations. Attached Figure Description

[0022] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0023] Figure 1 This is a connection diagram of the present invention.

[0024] Legend: 1. Cylinder body; 2. Inlet valve; 3. Outlet valve; 4. Jumper pipe; 5. Tee structure; 6. Sampling needle valve; 7. Sampling interface; 8. Aluminum foil bag. Detailed Implementation

[0025] The improved sampling cylinder structure of this utility model adds a three-way structure, a sampling needle valve, and a standardized sampling interface to the conventional sampling cylinder, achieving closed secondary sampling, complete removal of residual gas, and adaptability to multiple scenarios. Its specific application process is as follows:

[0026] like Figure 1 As shown, the improved sampling cylinder mainly consists of a cylinder body 1, an inlet valve 2, an outlet valve 3, a jumper pipe 4, a three-way structure 5, a sampling needle valve 6, and a sampling interface 7. The inlet valve 2 and outlet valve 3 are installed at the inlet and outlet of the cylinder body 1, respectively. The jumper pipe 4 connects the inlet valve 2 and outlet valve 3 to form a circulation path. The three-way structure 5 is located in the middle section of the jumper pipe 4, and its branches are sequentially connected to the sampling needle valve 6 and the sampling interface 7. The sampling interface 7 can be directly adapted to commonly used laboratory aluminum foil bags 8, or, through a detachable design, can be replaced to adapt to interfaces suitable for other dispensing containers.

[0027] During operation, the connection between the cylinder body 1 and the external sampler is controlled by the inlet valve 2 and the outlet valve 3. The crossover line 4 and the tee structure 5 form a bypass circulation to ensure that the medium in the cylinder and pipeline is fully replaced before sampling. The sampling needle valve 6 is used to control the opening and closing and the speed at which the sample is introduced into the dispensing container from the crossover line 4 through the sampling interface 7 to achieve closed secondary sampling. After sampling, the purging and venting process of the external sampler can be used to back purge the cylinder body 1 and pipeline through the crossover line 4 to completely remove residual gas.

[0028] Usage steps:

[0029] Preparation before sampling: Check the sealing of each component connection to ensure that the inlet valve 2, outlet valve 3, and sampling needle valve 6 are initially closed; according to the dispensing requirements, confirm that the sampling interface 7 is compatible with the target container (such as aluminum foil bag 8 or other containers). If the interface needs to be replaced, simply disassemble the sampling interface 7 and install the compatible model.

[0030] Circulation replacement stage: Open the root valves at the inlet and outlet of the sealed sampler, then open the cylinder inlet valve 2 and outlet valve 3, and close the sampling needle valve 6; switch the external sampler switch to the "sampling" position, the sample medium enters the cylinder body 1 through the inlet valve 2, then flows into the crossover line 4 through the outlet valve 3, and finally flows back to the sampler, forming the main circulation; at the same time, the crossover line 4 forms a bypass circulation through the three-way structure 5, so that the medium in the cylinder body 1, inlet valve 2, outlet valve 3 and crossover line 4 is fully replaced (the replacement time is set according to the characteristics of the medium, generally 3-5 minutes), ensuring the purity of the sample.

[0031] Secondary closed sampling stage: After the replacement is completed, the dispensing container (such as aluminum foil bag 8) is sealed and connected to the sampling interface 7. The sampling needle valve 6 is slowly opened, and the sample introduction speed is controlled by adjusting the opening of the needle valve (to avoid the container from breaking due to excessive flow rate). After the dispensing container is filled with the medium, the sampling needle valve 6 is closed, the container is removed and the sampling is completed. During this process, the main body of the gas cylinder 1 remains connected to the external sampler, and there is no need to insert or remove the gas cylinder.

[0032] Purging and Residual Removal Stage: After sampling, close the inlet and outlet valves of the external sampler, and switch the sampler to the "Purge" and "Vent" positions in sequence. Inert gas (such as nitrogen) is introduced. The inert gas flows back into the main body of the cylinder 1 through the jumper line 4 and the tee structure 5 to purge and replace the residual medium in the cylinder and pipeline. After 2-3 minutes, close the purging and venting valves to ensure that no residual gas contaminates subsequent samples.

[0033] Maintenance and Storage: The sampling needle valve 6 and sampling interface 7 are detachable structures. Regularly check the sealing performance. If wear occurs or a new container needs to be adapted, simply replace them. The material and size of the jumper pipe 4 are compatible with the inlet and outlet pipes of the gas cylinder, and no additional adjustments are required. When storing, keep the inlet valve 2, outlet valve 3 and sampling needle valve 6 closed to ensure the gas cylinder is sealed.

[0034] Example 1: Laboratory sampling using aluminum foil bags:

[0035] This embodiment is for routine laboratory testing, using aluminum foil bags (8) as the dispensing containers. The specific steps are as follows:

[0036] Compatibility check: Confirm that sampling interface 7 is a standard interface for the aluminum foil bag 8, check the sealing performance of the aluminum foil bag 8, and ensure that there is no damage.

[0037] Circulation replacement: Open the root valve of the external sampler, the inlet valve 2 and the outlet valve 3 of the cylinder, and close the sampling needle valve 6; adjust the sampler switch to the "sampling" position, and the sample medium circulates through the cylinder body 1 and the cross-connection line 4. The cross-connection line 4 forms a bypass circulation through the three-way structure 5, and the replacement continues for 4 minutes to ensure the purity of the medium.

[0038] Sampling with aluminum foil bag: Connect the interface of aluminum foil bag 8 tightly to the sampling interface 7, slowly open the sampling needle valve 6, adjust the opening to allow the sample to flow into aluminum foil bag 8 at a stable flow rate, and close the sampling needle valve 6 after aluminum foil bag 8 is full, remove aluminum foil bag 8, seal and send for testing.

[0039] Purging process: Close the valve at the base of the sampler, switch the sampler switch to the "purge" and "vent" positions, purge the cylinder and pipeline with nitrogen gas for 3 minutes in the reverse direction, close all valves, and keep the cylinder connected to the sampler. It can be used directly for the next sampling.

[0040] Example 2: Sampling from plastic sampling bottles submitted by a third party:

[0041] This embodiment addresses the testing needs of third-party institutions, using plastic sampling bottles with standard threaded interfaces as the dispensing containers. The specific steps are as follows:

[0042] Interface replacement: Remove the original sampling interface 7 and install a special sampling interface 7 that is compatible with the threaded interface of the plastic sampling bottle, ensuring that the interface sealing gasket is intact.

[0043] Medium replacement: Open the sampler root valve, cylinder inlet valve 2 and outlet valve 3, and close the sampling needle valve 6; switch the sampler switch to the "sampling" position, and the sample medium circulates through the cylinder body 1 and the cross-connection line 4. The bypass circulation continues to replace for 3 minutes to remove residual gas in the pipeline.

[0044] Plastic bottle sampling: Connect the plastic sampling bottle to the sampling interface 7 via the thread and tighten it. Open the sampling needle valve 6 and control the flow rate to slowly fill the plastic bottle with the sample (avoid excessive pressure that could deform the bottle). Close the sampling needle valve 6, unscrew the plastic bottle and tighten the sealing cap.

[0045] Residual removal: Close the valve at the root of the sampler, start the purging and venting process, purge with nitrogen for 2 minutes in reverse, and close all valves; disassemble the special sampling interface 7, replace it with the standard interface, and store the gas cylinder for later use.

[0046] The above embodiments do not require repeated insertion and removal of the gas cylinder. They achieve closed sampling through independent bypass control, which is convenient to operate and highly safe, and can meet the sampling needs in different scenarios.

[0047] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An improved sampling cylinder structure, characterized in that: It includes the main body of the cylinder (1), the inlet valve (2), the outlet valve (3), the cross-connection line (4), the three-way structure (5), the sampling needle valve (6), and the sampling interface (7). The inlet valve (2) and outlet valve (3) are respectively installed at the inlet and outlet of the cylinder body (1); The cross-pipe (4) connects the inlet valve (2) and the outlet valve (3); The three-way structure (5) is set in the middle section of the cross-pipe (4); The sampling needle valve (6) and the sampling interface (7) are installed sequentially on the branch of the three-way structure (5).

2. The improved sampling cylinder structure as described in claim 1, characterized in that: The sampling interface (7) is a standardized interface, and the sampling interface (7) is connected to an aluminum foil bag (8).

3. The improved sampling cylinder structure as described in claim 1, characterized in that: The sampling needle valve (6) controls the speed and on / off state of the sample being introduced from the cross-connection line (4) through the sampling interface (7) into the aluminum foil bag (8).

4. The improved sampling cylinder structure as described in claim 1, characterized in that: The bypass pipeline (4) works in conjunction with the inlet valve (2), the outlet valve (3) and the three-way structure (5) to form a bypass closed loop, which fully replaces the medium in the main body of the cylinder (1) and the inlet and outlet pipelines.

5. The improved sampling cylinder structure as described in claim 1, characterized in that: The sampling needle valve (6) and sampling interface (7) are detachable.

6. The improved sampling cylinder structure as described in claim 1, characterized in that: The material and size of the cross-connection line (4) are compatible with the inlet and outlet pipelines of the cylinder body (1).

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