A dual-mouth gas sampling bag

Abstract

This utility model relates to the field of gas sampling technology and discloses a dual-port gas sampling bag, including a tear-resistant layer, a barrier layer fixedly connected to the inner wall of the tear-resistant layer, a food-grade protective layer fixedly connected to the inner wall of the barrier layer, a foldable support frame fixedly connected to the inner wall of the food-grade protective layer, a first air tube connected to the top front side of the outer wall of the tear-resistant layer, an air inlet pipe threadedly connected to the inner wall of the first air tube, and a second air tube connected to the bottom front side of the outer wall of the tear-resistant layer. A switch valve is rotatably connected to the inner wall of the second air tube. In this utility model, the tear-resistant layer, barrier layer, food-grade protective layer, and foldable support frame cooperate to provide protection, maintain shape, and prevent contamination. The dual-port design and the switch valve ensure that the second air tube is closed during sampling, preventing outside air from entering and solving the problem of outside air entering and data distortion caused by opening the bag of a single-opening sampling bag.

Description

Technical Field

[0001] This utility model relates to the field of gas sampling technology, and in particular to a dual-port gas sampling bag. Background Technology

[0002] Gas sampling technology has wide applications in environmental monitoring and industrial safety, especially in gas stoves and flammable and explosive environments, where accurate detection of gas content is crucial for safety. Currently, gas sampling is mainly carried out through sampling bags or sampling bottles. Sampling bags are widely used due to their portability and low cost. However, traditional sampling bags have the problem of gas contamination during the sampling process, resulting in inaccurate detection data and affecting subsequent analysis and decision-making. With the increasing requirements for environmental protection and safety, higher demands are being placed on the accuracy and reliability of gas sampling technology.

[0003] A search revealed Chinese patent publication number CN215811929U, which discloses a gas sampling bag, including a bag body and a nozzle and guide components disposed on the bag body. The bag body includes a flexible first wall and a second wall, with the edges of the first wall and the second wall connected to form a seal. A cavity is formed between the first wall and the second wall. Fixing components are disposed on two opposite sides of the seal. The nozzle is disposed on the first wall. The guide components include two identical guides, each rotatably connected to a corresponding fixing component. Each guide includes a main rod and a connecting rod. A notch is disposed at the middle position along the axial direction of the main rod. When the two guides rotate to above the nozzle on the first wall and the main rods of the two guides abut against each other, the notches on the two guides surround each other to form a positioning hole. By setting guide components on the gas sampling bag, the distance of the injection needle entering the gas sampling bag is limited to avoid excessive insertion and puncturing the gas sampling bag. However, in actual use, when the bag is opened, outside air will mix in, causing the sampling data to be distorted. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a dual-opening gas sampling bag, which aims to improve the problem that when a single-opening sampling bag is opened, outside air will mix in, resulting in distorted sampling data.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a dual-port gas sampling bag, comprising a tear-resistant layer, a barrier layer fixedly connected to the inner wall of the tear-resistant layer, a food-grade protective layer fixedly connected to the inner wall of the barrier layer, a foldable support frame fixedly connected to the inner wall of the food-grade protective layer, a first air tube connected to the top front side of the outer wall of the tear-resistant layer, an air inlet pipe threadedly connected to the inner wall of the first air tube, a second air tube connected to the bottom front side of the outer wall of the tear-resistant layer, a switch valve rotatably connected to the inner wall of the second air tube, a pressure gauge fixedly connected to the bottom front side of the outer wall of the tear-resistant layer, and a filter mechanism provided on the inner wall of the air inlet pipe for filtering impurities.

[0006] The above technical solution employs the following: A tear-resistant layer is located on the outermost layer, relying on its high strength to resist external physical impacts and protect the interior. Its inner wall is connected to a barrier layer, which uses its own material to prevent external gas penetration. This barrier layer is fixed to a food-grade protective layer, ensuring no contamination of the collected gas. The inner wall of the food-grade protective layer is connected to a foldable support frame, allowing the sampling bag to be folded and maintain its shape. A first air tube at the top front of the tear-resistant layer's outer wall connects to an inlet pipe; the two are threaded together to prevent gas leakage. The inlet pipe is responsible for delivering gas into the sampling bag. A second air tube is located at the bottom front of the tear-resistant layer's outer wall, with a rotatable valve connected to its inner wall. During sampling, the valve is closed to prevent outside air from entering; when gas needs to be discharged or transferred, the valve is opened. A pressure gauge is also fixed at the bottom front of the tear-resistant layer's outer wall, monitoring the gas pressure inside the sampling bag in real time. This allows users to understand the gas pressure inside the bag, determine whether the sampling is sufficient or if there is any leakage, and provide crucial reference for the sampling operation.

[0007] As a further description of the above technical solution: The filtering mechanism includes a sealing ring, which is fixedly connected to the middle of the inner wall of the air intake pipe. Slide tracks are provided on both the left and right sides of the inner wall. A filter screen is slidably connected to the inner wall of the air intake pipe. A hexagonal hole is provided in the middle of the outer wall of the filter screen. Slider blocks are fixedly connected to both the left and right sides of the outer wall of the filter screen. Two sliders are slidably connected to the corresponding slide tracks. A limit ring is provided in the middle of the inner wall of the air intake pipe. Both sliders are slidably connected to the limit ring.

[0008] The above technical solution involves symmetrical sliding tracks on the left and right sides of the inner wall of the intake pipe, and sliders on the left and right sides of the outer wall of the filter screen. The tracks and sliders are compatible, and the sliders can slide within the tracks. This facilitates the installation, removal, and adjustment of the filter screen within the intake pipe. With this sliding connection, users can easily insert the filter screen into the intake pipe and easily remove it when cleaning or replacing it. A limiting ring is opened in the middle of the inner wall of the intake pipe, and the limiting ring is slidably connected to the slider. The limiting ring restricts the axial movement range of the filter screen within the intake pipe.

[0009] As a further description of the above technical solution: A lifting tab is fixedly connected to the top of the tear-resistant layer, and multiple anti-slip strips are fixedly connected to the front and rear sides of the outer wall of the tear-resistant layer.

[0010] The above technical solution allows the pull tab to facilitate the collector's handling of the sampling bag, while the anti-slip strips on the outer wall of the tear-resistant layer increase the contact friction between the hand and the sampling bag, effectively preventing the sampling bag from slipping during handling.

[0011] As a further description of the above technical solution: A pre-drilled hole is provided at the top center of the outer wall of the lifting piece, and a hanging ring is slidably connected to the inner wall of the pre-drilled hole.

[0012] With the above technical solution, the pre-drilled hole and the hanging ring are slidably connected, so that the collector can either hook the lifting strip with his finger to pick up the sampling bag, or hang the sampling bag with the hanging ring, making the picking and placement operation more convenient.

[0013] As a further description of the above technical solution: An installation plate is fixedly connected to the right side of the outer wall of the tear-resistant layer, and a card slot is provided on the inner wall of the installation plate.

[0014] The above technical solution features an ingeniously designed card slot that allows for easy insertion of cards. By recording information such as sampling time, location, and gas type on the cards, the sampling bags can be quickly identified and efficiently managed.

[0015] As a further description of the above technical solution: The front end of the air intake pipe is rotatably connected to a cap, and a rubber stopper is fixedly connected to the rear side of the outer wall of the cap.

[0016] The above technical solution allows the rubber stopper connected to the cap to tightly seal the air inlet when no sampling is being performed, effectively preventing external impurities from entering and preventing gas leakage.

[0017] As a further description of the above technical solution: The bottom of the outer wall of the cap is fixedly connected to a protrusion, and the surface of the protrusion is provided with multiple anti-slip grooves.

[0018] Through the above technical solution: the protrusion is equipped with multiple anti-slip grooves, which makes it convenient for users to operate. When you pinch the protrusion with your fingers and rotate the cap, the anti-slip grooves increase the friction between your fingers and the protrusion, making rotation easier and more convenient.

[0019] As a further description of the above technical solution: A digital display screen is fixedly connected to the front side of the outer wall of the pressure gauge, and the surface of the digital display screen is treated with wear resistance.

[0020] Through the above technical solution, the digital display screen can present the gas pressure value inside the sampling bag in real time and intuitively. Its surface is treated with wear-resistant material, which can effectively resist the wear caused by scratches during daily use and ensure that the reading is always clearly visible.

[0021] This utility model has the following beneficial effects: 1. In this utility model, the tear-resistant layer, barrier layer, food-grade protective layer and foldable support frame work together to provide protection, maintain shape and prevent contamination, and ensure a stable sampling environment. The threaded connection between the air inlet pipe and the first air pipe ensures airtightness and facilitates replacement. The dual-port design and the cooperation of the switch valve close the second air pipe during sampling to prevent outside air from mixing in, thus solving the problem of outside air mixing in and data distortion caused by opening the single-opening sampling bag.

[0022] 2. In this utility model, the sealing ring prevents impurities from entering the sampling bag unfiltered and affecting the analysis. The sliding connection design of the slide and the slider makes the filter screen easy to install, disassemble and clean, reducing maintenance difficulty and cost. The hexagonal hole makes it easy to remove the filter screen with the help of the matching tools, further improving the convenience of operation. The limiting ring effectively restricts the axial displacement of the filter screen, so that it can remain stable in the optimal filtration position under gas impact, continuously and stably ensuring the gas filtration quality and improving the sampling accuracy. Attached Figure Description

[0023] Figure 1 This is a perspective view of a dual-port gas sampling bag proposed in this utility model; Figure 2 This is a partial structural schematic diagram of a dual-port gas sampling bag proposed in this utility model; Figure 3 This is a partial structural disassembly diagram of a dual-port gas sampling bag proposed in this utility model; Figure 4 This is a schematic diagram of the protrusions in a dual-port gas sampling bag proposed in this utility model; Figure 5 This is a schematic diagram of the filtration mechanism of a dual-port gas sampling bag proposed in this utility model; Figure 6 This is a cross-sectional view of the air inlet pipe of a dual-port gas sampling bag proposed in this utility model.

[0024] Legend: 1. Tear-resistant layer; 2. Filtering mechanism; 201. Sealing ring; 202. Slide rail; 203. Filter screen; 204. Hexagonal hole; 205. Slider; 206. Limiting ring; 3. Barrier layer; 4. Food-grade protective layer; 5. Foldable support frame; 6. First air pipe; 7. Air inlet pipe; 8. Second air pipe; 9. Switch valve; 10. Pressure gauge; 11. Lifting plate; 12. Anti-slip strip; 13. Reserved hole; 14. Hanging ring; 15. Mounting plate; 16. Card slot; 17. Cap; 18. Rubber stopper; 19. Protrusion; 20. Anti-slip groove; 21. Digital display screen. Detailed Implementation

[0025] 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.

[0026] Reference Figure 1 , Figure 2 and Figure 3 This utility model provides an embodiment of a dual-port gas sampling bag, including a tear-resistant layer 1 providing high-strength physical protection. A barrier layer 3 is fixedly connected to the inner wall of the tear-resistant layer 1, effectively blocking the penetration of external gas molecules. A food-grade protective layer 4 is fixedly connected to the inner wall of the barrier layer 3, further protecting the sampled gas and ensuring that the sampling bag does not contaminate the collected gas, thus guaranteeing the cleanliness of the sampled gas. A foldable support frame 5 is fixedly connected to the inner wall of the food-grade protective layer 4, ensuring that the sampling bag can be folded for easy storage and carrying, while maintaining its shape during sampling and storage to prevent factors such as compression from affecting the sampling effect. The top front side of the outer wall of the tear-resistant layer 1 is connected to a first air tube 6, which provides a channel for gas to enter the sampling bag. The inner wall of the first air tube 6 is threaded with an air inlet tube 7, which allows for the selection of a suitable air inlet tube 7 according to different sampling needs. The bottom front side of the outer wall of the tear-resistant layer 1 is connected to a second air tube 8, which is used to discharge or transfer the gas in the sampling bag when needed. The inner wall of the second air tube 8 is rotatably connected to a switch valve 9, which controls the gas flow of the second air tube 8 and keeps it closed during sampling to prevent outside air from entering through the port. The bottom front side of the outer wall of the tear-resistant layer 1 is fixedly connected to a pressure gauge 10, which displays the pressure of the gas in the sampling bag in real time. The inner wall of the air inlet tube 7 is provided with a filter mechanism 2, which is used to filter impurities. Specifically, the tear-resistant layer 1, as the outermost layer, resists external physical impacts with its high strength properties, protecting the internal structure. Its inner wall is tightly connected to the barrier layer 3, which blocks external gas penetration through its material properties. The barrier layer 3 is also fixed to the food-grade protective layer 4, which ensures that the collected gas is not contaminated. The inner wall of the food-grade protective layer 4 is connected to a foldable support frame 5, which maintains the shape of the bag while ensuring that the sampling bag can be folded. The first air pipe 6 at the top front of the outer wall of the tear-resistant layer 1 is used to connect to the air inlet pipe 7. The two are connected by threads to ensure a tight connection and prevent gas leakage. The air inlet pipe 7 delivers gas into the sampling bag. The second air pipe 8 at the bottom front of the outer wall of the tear-resistant layer 1 has a rotatable switch valve 9 connected to its inner wall. The switch valve 9 controls the gas flow. It is kept closed during sampling to prevent outside air from entering, and is opened when gas needs to be discharged or transferred. The pressure gauge 10 fixed at the bottom front of the outer wall of the tear-resistant layer 1 monitors the gas pressure inside the sampling bag in real time.

[0027] Reference Figure 1 , Figure 5 and Figure 6 The filter mechanism 2 includes a sealing ring 201, which is fixedly connected to the middle of the inner wall of the air intake pipe 7, tightly fitting the inner wall of the air intake pipe 7, effectively preventing gas from bypassing through the gap between the filter screen 203 and the air intake pipe 7. Slide tracks 202 are provided on the right side of the inner wall of the air intake pipe 7 to guide the installation and sliding of the filter screen 203. The filter screen 203 is slidably connected to the inner wall of the air intake pipe 7 to intercept impurities in the gas. A hexagonal hole 204 is provided in the middle of the outer wall of the filter screen 203 for easy... The filter screen 203 can be easily removed by using the matching tool through the hexagonal hole 204. The filter screen 203 has sliders 205 fixedly connected to the left and right sides of its outer wall, which cooperate with the slide rail 202. The two sliders 205 are slidably connected to the corresponding slide rail 202. A limit ring 206 is opened in the middle of the inner wall of the air intake pipe 7 to limit the axial position of the filter screen 203 in the air intake pipe 7. The two sliders 205 are slidably connected to the limit ring 206. Specifically, the symmetrically arranged slides 202 on the left and right sides of the inner wall of the intake pipe 7 are precisely matched with the sliders 205 fixedly connected to the left and right sides of the outer wall of the filter screen 203. The sliders 205 can slide smoothly within the slides 202. This matching method provides convenience for the installation, removal, and adjustment of the filter screen 203 within the intake pipe 7. Through this sliding connection, the user can easily insert the filter screen 203 into the intake pipe 7 and conveniently remove it when cleaning or replacing the filter screen 203 is required. The limiting ring 206 in the middle of the inner wall of the intake pipe 7 is slidably connected to the sliders 205. The presence of the limiting ring 206 restricts the axial movement range of the filter screen 203 within the intake pipe 7. When the filter screen 203 slides within the intake pipe 7, the slider 205 slides along the inner wall of the limiting ring 206, preventing the filter screen 203 from being excessively displaced due to the impact force generated by the gas flow, ensuring that the filter screen 203 is always in a suitable filtering position within the intake pipe 7 and stably performs its filtering function.

[0028] Reference Figure 1 , Figure 2 and Figure 4 The top of the tear-resistant layer 1 is fixedly connected to a lifting tab 11, providing a convenient gripping area for users to lift the entire sampling bag. Multiple anti-slip strips 12 are fixedly connected to the front and back sides of the outer wall of the tear-resistant layer 1 to increase the friction between the hand and the outer wall of the sampling bag and prevent slippage when holding the sampling bag. A reserved hole 13 is opened in the middle of the top of the outer wall of the lifting tab 11. A hanging ring 14 is slidably connected to the inner wall of the reserved hole 13. The reserved hole 13 provides an installation position for the hanging ring 14, so that the sampling bag can be suspended in a specific position through the hanging ring 14 to meet the storage needs of different scenarios. A mounting plate 15 is fixedly connected to the right side of the outer wall of the tear-resistant layer 1. The mounting plate 15 is used to support the card slot 16 and provide an installation base for the card slot 16, so that the card slot 16 can be stably set on the outer wall of the sampling bag. The inner wall of the mounting plate 15 has a card slot 16 for inserting a card to record sampling information. Specifically, the lifting tab 11 makes it easy for the collector to pick up the sampling bag, the anti-slip strip 12 increases the friction between the hand and the sampling bag to prevent it from slipping when picked up, the reserved hole 13 is slidably connected to the hanging ring 14, making it easy to hook the lifting tab 11 with your fingers or hang the sampling bag through the hanging ring 14, making it easy to pick up and place, and the card slot 16 can insert a card to mark the sampling information for easy identification and management.

[0029] Reference Figure 1 , Figure 3 and Figure 4A cap 17 is rotatably connected to the front end of the air inlet pipe 7. A rubber stopper 18 is fixedly connected to the rear side of the outer wall of the cap 17. When the cap 17 is not sampling, rotating the cap 17 will cause the rubber stopper 18 to block the air inlet pipe 7, preventing external impurities from entering and gas from leaking. A protrusion 19 is fixedly connected to the bottom of the outer wall of the cap 17. The surface of the protrusion 19 has multiple anti-slip grooves 20, which facilitates user operation. A digital display screen 21 is fixedly connected to the front side of the outer wall of the pressure gauge 10, which can display the gas pressure value in the sampling bag in real time and intuitively. The surface of the digital display screen 21 is treated with wear resistance to effectively prevent wear caused by scratches during daily use. Specifically, when the cap 17 is not sampling, rotating the cap 17 causes the rubber stopper 18 to block the air inlet pipe 7, preventing external impurities from entering and gas leakage. The multiple anti-slip grooves 20 on the protrusion 19 greatly facilitate user operation. When the user pinches the protrusion 19 and rotates the cap 17, the anti-slip grooves 20 increase the friction between the finger and the protrusion 19, making the rotation operation easier and more convenient. The digital display screen 21 can display the gas pressure value inside the sampling bag in real time and intuitively. The surface has been treated with wear-resistant material to effectively prevent wear caused by scratches during daily use.

[0030] Working principle: The outermost tear-resistant layer 1 provides high-strength physical protection to prevent the sampling bag from being damaged by external forces during sampling and transportation. The barrier layer 3 effectively blocks the penetration of external gas molecules, preventing external gases from interfering with the sampling gas. The food-grade protective layer 4 provides further protection for the sampling gas and ensures that the sampling bag will not contaminate the collected gas. The foldable support frame 5 ensures that the sampling bag can be folded for easy storage and carrying, while also maintaining the shape of the sampling bag during sampling and storage, preventing factors such as compression from affecting the sampling effect. During sampling, the gas enters the sampling bag through the air inlet pipe 7, which is connected to the first air pipe 6 by threads. This connection method ensures a tight connection to prevent gas leakage and facilitates the disassembly and replacement of the air inlet pipe 7. The filter mechanism 2 installed on the inner wall of the air inlet pipe 7 filters the gas before it enters the sampling bag. To remove any impurities and ensure the purity of the collected gas samples, thus guaranteeing accurate subsequent analysis, the switch valve 9 on the second air tube 8 is closed when the gas enters the sampling bag to prevent outside air from entering through this opening. The gas is collected through the first air tube 6 and the air inlet tube 7, avoiding the problem of outside air mixing in when the bag is opened for collection, as is the case with single-opening sampling bags. After sampling, the air inlet tube 7 is closed. The pressure of the gas inside the sampling bag can be monitored by observing the pressure gauge 10 fixedly connected to the bottom front side of the tear-resistant layer 1 to determine whether the sampling is sufficient or whether there is a gas leak. If it is necessary to discharge or transfer the gas inside the sampling bag, the switch valve 9 can be opened and the operation can be carried out through the second air tube 8. The entire process does not require opening the large opening of a single-opening sampling bag, thus effectively solving the problem of outside air mixing causing the sampling data to be distorted, and ensuring the accuracy and reliability of the sampling data. Furthermore, the sealing ring 201 is fixed in the middle of the inner wall of the intake pipe 7. By tightly fitting the inner wall of the intake pipe 7, it effectively prevents gas from bypassing the gap between the filter screen 203 and the intake pipe 7, ensuring that all gas entering the intake pipe 7 must be filtered by the filter screen 203, thereby ensuring the filtration effect. The slides 202 opened on the left and right sides of the inner wall of the intake pipe 7 provide guidance for the installation and sliding of the filter screen 203. The hexagonal hole 204 opened in the middle of the outer wall of the filter screen 203 facilitates the removal of the filter screen 203 using the matching tools. The slider 205 is slidably connected to the corresponding slide 202. This structural design allows the filter screen 203 to slide smoothly in the intake pipe 7, which is convenient for installation, disassembly and cleaning. At the same time, the limiting ring 206 opened in the middle of the inner wall of the intake pipe 7 is slidably connected to the slider 205, which restricts the axial position of the filter screen 203 in the intake pipe 7, preventing it from being excessively displaced under the impact of gas flow, and ensuring that the filter screen 203 is always in a suitable filtration position.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dual port gas sampling bag comprising a tear resistant layer (1), characterized in that: The inner wall of the tear-resistant layer (1) is fixedly connected to a barrier layer (3), the inner wall of the barrier layer (3) is fixedly connected to a food-grade protective layer (4), the inner wall of the food-grade protective layer (4) is fixedly connected to a foldable support frame (5), the top front side of the outer wall of the tear-resistant layer (1) is connected to a first air pipe (6), the inner wall of the first air pipe (6) is threadedly connected to an air inlet pipe (7), the bottom front side of the outer wall of the tear-resistant layer (1) is connected to a second air pipe (8), the inner wall of the second air pipe (8) is rotatably connected to a switch valve (9), the bottom front side of the outer wall of the tear-resistant layer (1) is fixedly connected to a pressure gauge (10), and the inner wall of the air inlet pipe (7) is provided with a filter mechanism (2), which is used to filter impurities.

2. A dual port gas sampling bag according to claim 1, wherein: The filter mechanism (2) includes a sealing ring (201), which is fixedly connected to the middle of the inner wall of the air intake pipe (7). The right side of the inner wall of the air intake pipe (7) is provided with a slide rail (202). The inner wall of the air intake pipe (7) is slidably connected with a filter screen (203). The middle of the outer wall of the filter screen (203) is provided with a hexagonal hole (204). The left and right sides of the outer wall of the filter screen (203) are fixedly connected with sliders (205). The two sliders (205) are slidably connected to the corresponding slide rails (202). The middle of the inner wall of the air intake pipe (7) is provided with a limiting ring (206). The two sliders (205) are slidably connected to the limiting ring (206).

3. The dual port gas sampling bag of claim 1, wherein: The top of the tear-resistant layer (1) is fixedly connected to a lifting tab (11), and multiple anti-slip strips (12) are fixedly connected to the front and back sides of the outer wall of the tear-resistant layer (1).

4. A dual port gas sampling bag according to claim 3, wherein: A pre-drilled hole (13) is provided at the top center of the outer wall of the lifting piece (11), and a hanging ring (14) is slidably connected to the inner wall of the pre-drilled hole (13).

5. The dual port gas sampling bag of claim 1, wherein: An installation plate (15) is fixedly connected to the right side of the outer wall of the tear-resistant layer (1), and a card slot (16) is provided on the inner wall of the installation plate (15).

6. The dual port gas sampling bag of claim 1, wherein: The front end of the air intake pipe (7) is rotatably connected to a cap (17), and a rubber stopper (18) is fixedly connected to the rear side of the outer wall of the cap (17).

7. A dual port gas sampling bag according to claim 6, wherein: The bottom of the outer wall of the cap (17) is fixedly connected to a protrusion (19), and the surface of the protrusion (19) is provided with multiple anti-slip grooves (20).

8. The dual port gas sampling bag of claim 1, wherein: A digital display screen (21) is fixedly connected to the front side of the outer wall of the pressure gauge (10), and the surface of the digital display screen (21) is treated with wear resistance.

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