Gas sampler for laboratory

Abstract

The utility model provides a laboratory gas sampler which comprises a piston cylinder, a gas inlet joint is fixedly arranged at the left end of the piston cylinder, a one-way valve is arranged on the gas inlet joint, a piston assembly is connected in the piston cylinder in a sliding mode, and a gas hole is formed in the side face of the left end of the piston cylinder in a penetrating mode. A storage assembly is fixedly installed on the outer side of the left end of the piston cylinder, the piston cylinder communicates with the storage assembly through an air hole, the storage assembly is filled with adsorption cotton, and a sealing assembly is arranged on the surface of the storage assembly and used for sealing the air hole. The device has the advantages that sampled gas can be conveniently and directly conveyed into a detection instrument, and moisture is removed when the gas is discharged.

Description

Technical Field

[0001] The utility model relates to the field of gas sampling, in particular to a gas sampler for laboratory use. Background Technique

[0002] In daily experiments in the laboratory, it is necessary to detect the gases generated during the reaction process, as well as gas raw materials, etc. It is necessary to collect samples through a gas sampler and then transport the sampled gas into a detection device for detection.

[0003] A Chinese patent with an application date of May 6, 2021 and a publication number of CN214952442U discloses a gas sampling device for laboratory detection, including a device body. A plurality of air outlet pipes are symmetrically communicated with the left and right side end faces of the device body. An air inlet pipe is fixedly communicated with the front end face of the device body. A sampling bag is sleeved on the outer surface of the air outlet pipe. A plurality of first sliding grooves are symmetrically arranged on the left and right side end faces of the device body. The first sliding grooves are located at one end of the air outlet pipe. A plurality of first grooves and a plurality of second grooves are arranged inside the left and right side end faces of the device body. The first grooves and the second grooves are respectively communicated with the inner wall of the air outlet pipe. The first sliding grooves are communicated with the second grooves. A screw rod is movably connected in the first sliding grooves. A clamping assembly is arranged on the outer surface of the air outlet pipe. The sampling device of the utility model can perform multiple gas samplings, save the time for replacing the sampling bag, and thus improve the work efficiency.

[0004] In this technical solution, by setting a plurality of sampling bags, the gases sampled multiple times can be stored separately. After sampling is completed, the gas can be connected to a detection instrument through the sampling bag for detection. The sampled gas cannot be directly transported to the detection instrument, and the operation is relatively troublesome. In addition, when the moisture content in the sample gas is relatively large during the collection of the sample gas, it will affect the subsequent detection results of the gas. Generally, the existing gas sampling devices cannot remove the moisture in the sample gas, and an additional drying and filtering device is required to process the sample gas. Therefore, further improvement can be made. Summary of the Invention

[0005] In order to solve the problems existing in the background technique, the utility model proposes a gas sampler for laboratory use.

[0006] A gas sampler for laboratory use includes a piston cylinder. An air inlet joint is fixedly installed at the left end of the piston cylinder. A one-way valve is arranged on the air inlet joint. A piston assembly is slidably connected inside the piston cylinder. An air hole is penetrated through the left side surface of the piston cylinder. A storage assembly is fixedly installed outside the left end of the piston cylinder. The piston cylinder is communicated with the storage assembly through the air hole. An adsorption cotton is filled inside the storage assembly. A sealing assembly is arranged on the surface of the storage assembly. The sealing assembly is used to seal the air hole.

[0007] Based on the above, the piston assembly includes a piston plate slidably connected inside the piston cylinder. A piston rod is fixedly installed at the center of the right side of the piston plate. The piston rod penetrates and is slidably connected to the right end of the piston cylinder. A first magnet is fixedly installed on the right side of the piston plate. An embedding groove is formed in the inner wall of the right end of the piston cylinder for accommodating the first magnet. A second magnet is fixedly installed on the inner wall of the embedding groove for adsorbing the first magnet.

[0008] Based on the above, the diameter of the air hole is smaller than the thickness of the piston plate.

[0009] Based on the above, the storage assembly includes a fixed cover fixedly installed at the left end of the piston cylinder. A sealing cover is sleeved on the right end of the fixed cover. The sealing cover is slidably connected to the outside of the piston cylinder. A rubber ring is fixedly installed on the outer wall of the right end of the fixed cover.

[0010] Based on the above, an annular bin is inserted into the fixed cover. The inner diameter of the annular bin is equal to the outer diameter of the piston cylinder, and the outer diameter of the annular bin is equal to the inner diameter of the fixed cover. Two symmetric U-shaped parts are integrally formed at the left end of the annular bin. Communication grooves are formed through both sides of the U-shaped parts. The assembly of the annular bin and the U-shaped parts is used for accommodating absorbent cotton. Two positioning blocks are fixedly installed on the inner wall of the fixed cover for being inserted into the U-shaped parts. One of the U-shaped parts is communicated with the piston cylinder through an air hole. A through hole is formed through one of the positioning blocks and is communicated with the exhaust joint. The annular bin is communicated with the U-shaped parts through the communication grooves.

[0011] Based on the above, a threaded hole is formed in the other positioning block and penetrates to the outside of the fixed cover. The sealing assembly includes a threaded rod threadedly connected to the threaded hole. A sealing plug is fixedly installed at one end of the threaded rod located inside the fixed cover for sealing the air hole.

[0012] Based on the above, a blocking ring is fixedly installed in the middle of the outer wall of the piston cylinder for blocking the sealing cover.

[0013] The utility model has substantial features and progress compared with the prior art. Specifically, through the setting of the air hole, the piston cylinder is communicated with the storage assembly. After the sealing assembly seals the air hole, by pulling the piston rod, gas can be sucked into the interior of the piston cylinder. The sampled gas can pass through the air hole and enter the storage assembly. After the moisture is adsorbed by the absorbent cotton, the exhaust joint is connected to the detection instrument through a pipeline, so that the sampled gas can be directly transported to the detection instrument, having the advantages of facilitating the direct transportation of the sampled gas into the detection instrument and removing moisture when discharging gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a three-dimensional structural schematic diagram of the utility model.

[0015] Figure 2 It is a schematic top - sectional structure diagram of the present utility model.

[0016] Figure 3 It is a three - dimensional exploded structure diagram of the storage component and the adsorption cotton of the present utility model from the right - front side view.

[0017] Figure 4 It is a three - dimensional exploded structure diagram of the storage component and the adsorption cotton of the present utility model from the right - rear side view.

[0018] Figure 5 It is a three - dimensional sectional structure diagram of the fixing cover, the annular bin, the positioning block and the sealing component of the present utility model.

[0019] Explanation of reference numerals: 1, piston cylinder; 2, air inlet joint; 3, one - way valve; 4, piston assembly; 5, air hole; 6, storage component; 7, adsorption cotton; 8, exhaust joint; 9, sealing component; 10, blocking ring; 401, piston plate; 402, piston rod; 403, first magnetic block; 404, groove; 405, second magnetic block; 601, fixing cover; 602, sealing cover; 603, rubber ring; 604, annular bin; 605, U - shaped part; 606, communication groove; 607, positioning block; 608, through - hole; 609, threaded hole; 901, threaded rod; 902, sealing plug. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] As Figures 1-5 shown, a gas sampler for laboratory use includes a piston cylinder 1. An air inlet joint 2 is fixedly installed at the left end of the piston cylinder 1. A one - way valve 3 is arranged on the air inlet joint 2, and the one - way valve 3 is used to control that the gas inside the piston cylinder 1 cannot pass through the air inlet joint 2 and be discharged to the outside. A piston assembly 4 is slidably connected inside the piston cylinder 1. An air hole 5 is penetrated and opened on the left - end side surface of the piston cylinder 1. A storage component 6 is fixedly installed outside the left end of the piston cylinder 1. The piston cylinder 1 is communicated with the storage component 6 through the air hole 5. An adsorption cotton 7 is filled inside the storage component 6, and the adsorption cotton 7 can also be activated carbon. A sealing component 9 is arranged on the surface of the storage component 6, and the sealing component 9 is used to seal the air hole 5.

[0022] The air hole 5 is sealed by the sealing component 9. When the piston component 4 is pulled to the right, a negative pressure is generated inside the piston cylinder 1, so that the gas to be collected can pass through the intake joint 2 and enter the inside of the piston cylinder 1. During this process, the air hole 5 is sealed by the sealing component 9 to prevent the moisture adsorbed in the adsorption cotton 7 from passing through the air hole 5 and entering the inside of the piston cylinder 1. The exhaust joint 8 can be connected to the gas detection instrument through a pipeline. Then, when the sealing component 9 no longer seals the air hole 5 and the piston component 4 is pushed to the left, the gas sample inside the piston cylinder 1 can be injected into the storage component 6 through the air hole 5. When the gas sample passes through the adsorption cotton 7, the moisture in it is absorbed by the adsorption cotton 7. After that, the dried gas sample enters the gas detection instrument through the exhaust joint 8.

[0023] During use, the piston component 4 includes a piston plate 401 slidably connected inside the piston cylinder 1. The diameter of the air hole 5 is smaller than the thickness of the piston plate 401, and the inner wall of the left end of the piston cylinder 1 is tangent to the inner wall of the air hole 5. Thus, when the piston plate 401 slides from right to left, all the gas sample inside the piston cylinder 1 can be discharged from the air hole 5. When the gas sample inside the piston cylinder 1 is completely discharged, the piston plate 401 fits against the inner wall of the left end of the piston cylinder 1, and the circumferential surface of the piston plate 401 seals the inner opening of the air hole 5. At this time, when the sealing component 9 is inserted into the air hole 5 for sealing, the circumferential surface of the piston plate 401 can be used to limit the sealing component 9 and control the depth of the sealing component 9 inserted into the air hole 5. A piston rod 402 is fixedly installed at the center of the right side of the piston plate 401. The piston rod 402 passes through and is slidably connected to the right end of the piston cylinder 1. A first magnet 403 is fixedly installed on the right side of the piston plate 401. An embedding groove 404 is formed in the inner wall of the right end of the piston cylinder 1 for accommodating the first magnet 403. A second magnet 405 is fixedly installed on the inner wall of the embedding groove 404 for adsorbing the first magnet 403. When the piston rod 402 is pulled to the right to drive the piston plate 401 to slide to the inner wall of the right end of the piston cylinder 1, the first magnet 403 is inserted into the embedding groove 404 and the first magnet 403 fits against the surface of the second magnet 405. Through the mutual attraction of the first magnet 403 and the second magnet 405, the resistance to pushing the piston rod 402 to the left is increased. Thus, after the gas sampling is completed, the piston rod 402 can be stably held inside the right end of the piston cylinder 1.

[0024] Specifically, the storage component 6 includes a fixed cover 601 fixedly installed at the left end of the piston cylinder 1. A sealing cover 602 is sleeved on the right end of the fixed cover 601. The sealing cover 602 is slidably connected to the outside of the piston cylinder 1. A rubber ring 603 is fixedly installed on the outer wall of the right end of the fixed cover 601. The friction between the sealing cover 602 and the fixed cover 601 is increased through the rubber ring 603 to ensure the stable connection between the fixed cover 601 and the sealing cover 602. And the gap between the fixed cover 601 and the sealing cover 602 is sealed through the rubber ring 603. The adsorption cotton 7 is filled between the fixed cover 601 and the sealing cover 602. The gas inside the piston cylinder 1 passes through the air hole 5 and enters the inside of the fixed cover 601 and the sealing cover 602. When the gas passes through the adsorption cotton 7, the moisture inside it is absorbed by the adsorption cotton 7. A blocking ring 10 is fixedly installed in the middle of the outer wall of the piston cylinder 1. The blocking ring 10 is used to block the sealing cover 602. The adsorption cotton 7 can be taken out of the fixed cover 601 by pushing the sealing cover 602 to slide on the piston cylinder 1, and then a new adsorption cotton 7 is replaced and placed into the fixed cover 601, which is convenient for replacing the adsorption cotton 7. The sealing cover 602 is blocked by the blocking ring 10 to prevent the sealing cover 602 from detaching from the piston cylinder 1. When sampling different gases, different adsorption cottons 7 can be replaced to prevent the gas from the previous sampling from accumulating inside the adsorption cotton 7 and causing cross-contamination.

[0025] An annular chamber 604 is inserted into the fixed cover 601. The inner diameter of the annular chamber 604 is equal to the outer diameter of the piston cylinder 1, and the outer diameter of the annular chamber 604 is equal to the inner diameter of the fixed cover 601. Two symmetrical U-shaped parts 605 are integrally formed at the left end of the annular chamber 604. Communication grooves 606 are penetrated and opened on both sides of the U-shaped parts 605. The annular chamber 604 is communicated with the U-shaped parts 605 through the communication grooves 606. The assembly of the annular chamber 604 and the U-shaped parts 605 is used to accommodate the adsorption cotton 7. The gas inside the piston cylinder 1 passes through the air hole 5 and enters one of the U-shaped parts 605, and then enters the annular chamber 604 through the communication groove 606. When the gas passes through the adsorption cotton 7 inside the annular chamber 604, the moisture inside it is absorbed by the adsorption cotton 7. Then the gas passes through the communication groove 606 opened in the other U-shaped part 605 and is discharged from the exhaust joint 8.

[0026] Two groups of positioning blocks 607 are fixedly installed on the inner wall of the fixed cover 601. The positioning blocks 607 are used to be inserted into the U-shaped part 605. During the process of inserting the annular bin 604 into the fixed cover 601, the annular bin 604 can be positioned by the cooperation of the positioning blocks 607 and the U-shaped part 605. After the positioning blocks 607 are inserted into the U-shaped part 605, half of the cavity is reserved in the U-shaped part 605. One of the U-shaped parts 605 is communicated with the piston cylinder 1 through the air hole 5. One of the positioning blocks 607 is provided with a through hole 608 penetrating therethrough. The through hole 608 is communicated with the exhaust joint 8. Thus, the gas inside the piston cylinder 1 enters one of the U-shaped parts 605 through the air hole 5, then enters the annular bin 604 through the communication groove 606. After the moisture is adsorbed by the adsorption cotton 7, the gas passes through the communication groove 606 on the other U-shaped part 605 and the through hole 608 opened on the positioning block 607, and finally is discharged through the exhaust joint 8.

[0027] In reality, the other positioning block 607 is provided with a threaded hole 609, and the threaded hole 609 penetrates to the outside of the fixed cover 601. The sealing assembly 9 includes a threaded rod 901 threadedly connected to the threaded hole 609. One end of the threaded rod 901 located inside the fixed cover 601 is fixedly installed with a sealing plug 902. The sealing plug 902 is used to seal the air hole 5. By rotating the threaded rod 901, the sealing plug 902 can be driven to rotate and insert into the air hole 5, or the sealing plug 902 can be driven to rotate and pull out from the air hole 5.

[0028] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A laboratory gas sampler, characterized in that: It includes a piston cylinder, an air inlet joint is fixedly installed on the left end of the piston cylinder, a one-way valve is arranged on the air inlet joint, a piston assembly is slidably connected inside the piston cylinder, an air hole is opened through the side surface of the left end of the piston cylinder, a storage assembly is fixedly installed on the outer side of the left end of the piston cylinder, the piston cylinder is connected with the storage assembly through the air hole, the storage assembly is filled with adsorbent cotton, a sealing assembly is arranged on the surface of the storage assembly, and the sealing assembly is used to seal the air hole.

2. The laboratory gas sampler according to claim 1, characterized in that: The piston assembly includes a piston plate slidably connected in the piston cylinder, a piston rod is fixedly installed at the center of the right side of the piston plate, the piston rod passes through and is slidably connected to the right end of the piston cylinder, a magnetic block 1 is fixedly installed on the right side of the piston plate, an embedding groove is opened on the inner wall of the right end of the piston cylinder, the embedding groove is used to accommodate magnetic block 1, and a magnetic block 2 is fixedly installed on the inner wall of the embedding groove, and the magnetic block 2 is used to adsorb magnetic block 1.

3. The laboratory gas sampler according to claim 2, characterized in that: The diameter of the air hole is smaller than the thickness of the piston plate.

4. The laboratory gas sampler according to claim 1, characterized in that: The storage assembly comprises a fixed cover fixedly mounted on the left end of the piston cylinder, a sealing cover is sleeved on the right end of the fixed cover, the sealing cover is slidably connected to the outside of the piston cylinder, and a rubber ring is fixedly mounted on the outer wall of the right end of the fixed cover.

5. The laboratory gas sampler according to claim 4, characterized in that: An annular bin is inserted inside the fixed cover, the inner diameter of the annular bin is equal to the outer diameter of the piston cylinder, the outer diameter of the annular bin is equal to the inner diameter of the fixed cover, the left end of the annular bin is integrally formed with two symmetrical groups of U-shaped parts, both sides of the U-shaped parts are penetrated with connecting grooves, the assembly of the annular bin and the U-shaped part is used to accommodate adsorption cotton, and two groups of positioning blocks are fixedly installed on the inner wall of the fixed cover, and the positioning blocks are used to be inserted in the U-shaped part; One of the U-shaped parts is connected to the piston cylinder through an air hole, one of the positioning blocks is penetrated by a through hole, the through hole is connected to the exhaust joint, and the annular chamber is connected to the U-shaped part through a connecting groove.

6. The laboratory gas sampler according to claim 5, characterized in that: Another positioning block is provided with a threaded hole, which extends to the outside of the fixed cover; the sealing assembly includes a threaded rod threadedly connected to the threaded hole, and a sealing plug is fixedly installed at one end of the threaded rod inside the fixed cover, and the sealing plug is used to seal the air hole.

7. The laboratory gas sampler according to claim 4, characterized in that: A blocking ring is fixedly installed at the middle part of the outer wall of the piston cylinder, and the blocking ring is used to block the sealing cover.

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