Anti-reflux device of gas sampling pipe

By designing a disassembly and assembly sealing structure and an anti-backflow structure, the problem of preventing internal air backflow and external air inflow in the gas sampling tube is solved, achieving high-efficiency sealing of the sampling tube and accuracy of the test results.

CN223910595UActive Publication Date: 2026-02-13GUANGZHOU CCIC YIDA EXPERIMENTAL EQUIPMENT CO LTD
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Patent Information

Application Number
CN202520125071.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-01-17
Publication Date
2026-02-13
Estimated Expiration
2035-01-17

AI Technical Summary

Technical Problem

Existing gas sampling tubes, while preventing internal air backflow, cannot prevent external air inflow, leading to inaccurate test results and affecting air outflow, resulting in poor sealing of the sampling tube.

Method used

It adopts a disassembly and assembly sealing structure and an anti-backflow structure, including components such as a mounting frame, air pump, air inlet pipe, air outlet pipe, fixed round rod, sliding cylinder and return spring. The internal sealing of the sampling tube is achieved through threaded connection and sealing ring groove to prevent gas backflow and leakage.

Benefits of technology

This improves the overall sealing of the sampling tube, preventing gas backflow and leakage, and ensuring the accuracy of test results and the effective use of the sampling tube.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The utility model provides an anti-reflux device of a gas sampling pipe, and relates to the technical field of anti-reflux devices. Comprising a pipe body, and a disassembly and assembly sealing structure is arranged in the pipe body; an anti-backflow structure is arranged on one side of the disassembly and assembly sealing structure; the dismounting and mounting sealing structure comprises a mounting round frame, the top of the outer surface of the mounting round frame is fixedly connected with the bottom of the pipe body, an air pump is fixedly mounted at the bottom of the inner wall of the mounting round frame, and the output end and the input end of the air pump communicate with an air inlet pipe and an air outlet pipe correspondingly. According to the sampling device, an external thread round frame can be matched, so that a connecting round rod and other structures can drive a plugging block to plug the inner wall of a connecting pipe, then the interior of a sampling pipe can be sealed after sampling is completed, and meanwhile, in the gas outlet process, gas can be prevented from reversely flowing from the connecting pipe and other parts and further leaking from a gas pump; and the overall sealing performance is improved.
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Description

TECHNICAL FIELD

[0001] The utility model relates to anti -reverse flow device technical field especially relates to a gas sampling pipe's anti -reverse flow device. BACKGROUND

[0002] The gas sampling pipe is mainly used in the environmental monitoring and management process, and is used for collecting and sampling the air in the environment of the specified area, and then transporting and storing the sampling pipe, and then cooperating with the specified equipment to monitor, in the sampling process, the gas reverse flow needs to be prevented, and the concentration of internal air sampling and the objectivity of the sample are avoided.

[0003] In actual work, the structure and function of the anti -reverse flow device of the prior art gas sampling pipe are relatively perfect, and the daily use demand can be basically met, but there will be the following problems:

[0004] In the actual sampling process, the anti -reverse flow device can prevent the internal air from flowing out, but cannot prevent the external air from flowing in, and when the external air flows in, the detection result is still inaccurate, and the anti -reverse flow device also affects the air flow of the sampling pipe, thereby affecting the detection process, which is very inconvenient.

[0005] Therefore, the utility model provides a gas sampling pipe's anti -reverse flow device. UTILITY MODEL CONTENT

[0006] The utility model aims at solving the shortcomings in the prior art, and provides a gas sampling pipe's anti -reverse flow device.

[0007] In order to realize the above object, the utility model adopts the following technical scheme: a gas sampling pipe's anti -reverse flow device, including pipe body, the inside of pipe body is provided with dismounting and sealing structure, one side of dismounting and sealing structure is provided with anti -reverse flow structure, the dismounting and sealing structure includes installation round frame, the outer surface top of installation round frame is fixedly connected with the bottom of pipe body, the inner wall bottom of installation round frame is fixedly installed with air pump, the output and input of air pump are communicated with air inlet pipe and air outlet pipe respectively, air inlet pipe is fixedly installed with the bottom inner wall of installation round frame, the anti -reverse flow structure includes fixed round rod, the top end of fixed round rod is slidably connected with sliding cylinder, the top of sliding cylinder is fixedly connected with the plugging cover.

[0008] As a preferred implementation, the bottom of the pipe body is fixedly connected with a connecting pipe, the connecting pipe is fixedly installed with the air outlet pipe, the inner wall of the open side of the pipe body is screwedly connected with a threaded hole, the inner wall of the threaded hole is screwedly connected with an external thread round frame, the outer surface of the external thread round frame is fixedly connected with a cover plate on one side, the outer surface of the cover plate is fixedly connected with a connecting round frame on one side, the outer surface of the connecting round frame is fixedly connected with a connecting round rod on one side, the outer surface of the connecting round rod is fixedly connected with a blocking block on one end, the connecting round rod and the blocking block are fixedly connected with an auxiliary round plate, the outer surface of the auxiliary round plate is fixedly connected with a first sealing ring block at the bottom, and the inner wall of the pipe body is provided with a first sealing ring groove at the bottom.

[0009] The technical effect of the further scheme is that the cover plate can be disassembled under the action of the threaded hole and the external thread round frame, the blocking block can assist in blocking the connecting pipe, the first sealing ring groove and the first sealing ring block can be sealed and fixed, the inside of the sampling pipe can be sealed and blocked, and the air in the sampling pipe can not leak.

[0010] As a preferred implementation, the inner wall of the cover plate is provided with a circular through hole, the bottom of the cover plate is provided with a second sealing ring groove, the outer surface of the blocking cover is fixedly connected with a second sealing ring block at the top, the inner wall of the connecting round frame is provided with a rectangular through hole, the outer surface of the fixed round rod is sleeved with a return spring, and the two ends of the return spring are fixedly connected with the sliding cylinder and the connecting round frame respectively.

[0011] The technical effect of the further scheme is that the cover plate can be assisted and sealed in cooperation with the fixed round rod and the sliding cylinder under the action of the second sealing ring groove and the second sealing ring block.

[0012] As a preferred implementation, the top of the cover plate is provided with a third sealing ring groove, the inner wall of the circular through hole is inserted with an air inlet pipe, the outer surface of the air inlet pipe is fixedly connected with an auxiliary ring plate, the outer surface of the auxiliary ring plate is fixedly connected with a third sealing ring block at the bottom, and the inner wall of the air inlet pipe is provided with an air inlet round hole below the auxiliary ring plate.

[0013] The technical effect of the further scheme is that the air inlet pipe can move downward in cooperation with the blocking cover, the third sealing ring block and the third sealing ring groove can be sealed, air can be guided out in cooperation with the external detection equipment under the action of the air inlet pipe, and air in the sampling pipe can not flow backward during the detection process.

[0014] Compared with the prior art, the utility model has the advantages and positive effects that,

[0015] By setting the dismounting and sealing structure, under the action of the plugging block, the outer threaded round frame can be matched, and then the connecting round rod structure can be driven to plugging block to plugging the inner wall of the connecting pipe, and then the inside of the sampling pipe can be sealed after sampling, and at the same time, the backflow of gas from the connecting pipe and other parts can be avoided during the gas outlet process, and then the leakage from the air pump can be avoided, and the overall sealing performance is improved. Under the action of the anti-backflow structure, the sliding cylinder can be driven to slide on the outer surface of the fixed round rod, and then the deformation of the return spring can be matched, and then the air hole can be matched with the plugging cover for gas outlet under the action of the air inlet tube, and at the same time, the backflow of internal gas from the connecting pipe during the gas outlet process can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A structure diagram of the anti-backflow device for the gas sampling pipe is provided.

[0017] Figure 2 A structure diagram of the anti-backflow device for the gas sampling pipe is provided.

[0018] Figure 3 A structure diagram of the anti-backflow device for the gas sampling pipe is provided.

[0019] Figure 4 A structure diagram of the anti-backflow device for the gas sampling pipe is provided.

[0020] Figure 5 A structure diagram of the anti-backflow device for the gas sampling pipe is provided.

[0021] Figure 6 A structure diagram of the anti-backflow device for the gas sampling pipe is provided. Figure 5 A structure diagram of the anti-backflow device for the gas sampling pipe is provided.

[0022] Legend:

[0023] 1, pipe body;

[0024] 2, dismounting and sealing structure; 21, mounting round frame; 22, air pump; 23, air inlet pipe; 24, air outlet pipe; 25, connecting pipe; 26, threaded hole; 27, outer threaded round frame; 28, cover plate; 29, connecting round frame; 210, connecting round rod; 211, auxiliary round plate; 212, first sealing ring block; 213, first sealing ring groove; 214, plugging block;

[0025] 3, anti-reflux structure; 31, round hole; 32, second sealing ring groove; 33, fixed round rod; 34, sliding cylinder; 35, reset spring; 36, blocking cover; 37, rectangular hole; 38, second sealing ring block; 39, third sealing ring groove; 310, air inlet tube; 311, auxiliary ring plate; 312, third sealing ring block; 313, air inlet round hole. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] As shown in the drawings, Figures 1-6 The present embodiment provides a technical solution: an anti-reflux device of a gas sampling tube, comprising a tube body 1, the inside of the tube body 1 is provided with a dismounting and sealing structure 2; one side of the dismounting and sealing structure 2 is provided with an anti-reflux structure 3; the dismounting and sealing structure 2 comprises a mounting round frame 21, the outer surface top of the mounting round frame 21 is fixedly connected with the bottom of the tube body 1, the inner wall bottom of the mounting round frame 21 is fixedly installed with a gas pump 22, the output end and the input end of the gas pump 22 are respectively communicated with an air inlet pipe 23 and an air outlet pipe 24, the air inlet pipe 23 is fixedly installed with the bottom inner wall of the mounting round frame 21; the anti-reflux structure 3 comprises a fixed round rod 33, the top end of the fixed round rod 33 is slidingly connected with a sliding cylinder 34, the top of the sliding cylinder 34 is fixedly connected with a blocking cover 36, by setting the dismounting and sealing structure 2, under the action of the blocking block 214, the external thread round frame 27 can be matched, and then the connecting round rod 210 and other structures can be driven to block the inner wall of the connecting pipe 25, and then the inside of the sampling tube can be sealed after sampling is completed, at the same time, in the process of air outlet, the anti-reflux structure 3 can drive the sliding cylinder 34 to slide on the outer surface of the fixed round rod 33, then the reset spring 35 can be deformed, and then under the action of the air inlet tube 310, the air inlet round hole 313 can be matched with the blocking cover 36 for air outlet, and at the same time, internal gas reflux from the connecting pipe 25 can be avoided during air outlet.

[0028] Further, as shown in the drawings, Figures 3-5As shown: the bottom of the pipe body 1 is fixedly connected with the connecting pipe 25, the connecting pipe 25 is fixedly installed with the gas outlet pipe 24, the inner wall of the opening side of the pipe body 1 is threadedly connected with the threaded hole 26, the inner wall of the threaded hole 26 is threadedly connected with the external thread round frame 27, the outer surface of the external thread round frame 27 is fixedly connected with the cover plate 28 on one side, the outer surface of the cover plate 28 is fixedly connected with the connecting round frame 29 on one side, the outer surface of the connecting round frame 29 is fixedly connected with the connecting round rod 210 on one side, the outer surface of the connecting round rod 210 is fixedly connected with the blocking block 214 on one end, the connecting round rod 210 is fixedly connected with the auxiliary round plate 211 at the connecting place of the blocking block 214, the outer surface of the auxiliary round plate 211 is fixedly connected with the first sealing ring block 212 at the bottom, the inner wall of the pipe body 1 is provided with the first sealing ring groove 213 at the bottom, the cover plate 28 can be disassembled under the action of the threaded hole 26 and the external thread round frame 27, so that the blocking block 214 can assist in blocking the connecting pipe 25, and meanwhile the first sealing ring groove 213 and the first sealing ring block 212 can be sealed and fixed, so that the inside of the sampling pipe can be sealed and blocked, and thus the air in the sampling pipe can be prevented from leaking.

[0029] In the above scheme, when the gas in the pipe body 1 is taken out, leakage is prone to occur, for example, Figure 6 As shown: the inner wall of the cover plate 28 is provided with a circular through hole 31 in the present scheme, the bottom of the cover plate 28 is provided with a second sealing ring groove 32, the outer surface of the blocking cover 36 is fixedly connected with a second sealing ring block 38 at the top, the inner wall of the connecting round frame 29 is provided with a rectangular through hole 37, the outer surface of the fixed round rod 33 is sleeved with a return spring 35, the two ends of the return spring 35 are fixedly connected with the sliding cylinder 34 and the connecting round frame 29 respectively, and the cover plate 28 can be assisted in sealing under the action of the second sealing ring groove 32 and the second sealing ring block 38 in cooperation with the fixed round rod 33 and the sliding cylinder 34.

[0030] In the above scheme, when the external device is inserted into the pipe body 1, gas leakage is prone to occur, for example, Figure 6 As shown, the top of the cover plate 28 is provided with a third sealing ring groove 39, the inner wall of the circular through hole 31 is inserted with a ventilation insertion pipe 310, the outer surface of the ventilation insertion pipe 310 is fixedly connected with an auxiliary ring plate 311, the outer surface of the auxiliary ring plate 311 is fixedly connected with a third sealing ring block 312 at the bottom, the inner wall of the ventilation insertion pipe 310 is provided with a ventilation round hole 313 below the auxiliary ring plate 311, and the ventilation insertion pipe 310 can move downward in cooperation with the blocking cover 36, and thus the third sealing ring block 312 and the third sealing ring groove 39 can be sealed, and at the same time, under the action of the ventilation insertion pipe 310, the external detection device can be cooperated to guide the air out, and at the same time, the air in the sampling pipe can be prevented from flowing back during the detection process.

[0031] Working principle:

[0032] As Figures 1-6 shown:

[0033] In use: start the air pump 22, so that the air from the air inlet pipe 23 to the air outlet pipe 24, and then through the connecting pipe 25 to the inside of the pipe body 1, when the sampling is completed, at this time rotate the outer thread round frame 27, the outer thread round frame 27 with the threaded hole 26 in the inner wall of the pipe body 1 is only screw fixed half position, at this time continue to twist, so that the blocking block 214 card into the inside of the connecting pipe 25, at this time the first sealing ring block 212 can be carded into the inner wall of the first sealing ring groove 213;

[0034] When the gas needs to be taken out, at this time the airway cannula 310 is inserted into the inner wall of the circular hole 31, and then drives the blocking cover 36 and the sliding cylinder 34 to slide on the outer surface of the fixed circular rod 33, so that the reset spring 35 is deformed, and then the second sealing ring block 38 is separated from the second sealing ring groove 32, at this time the third sealing ring block 312 is fixed with the third sealing ring groove 39, and then the air is discharged through the rectangular hole 37 and the airway round hole 313.

[0035] The above is only the preferred embodiment of the present application, not the other forms of the present application for other forms of restrictions, any skilled in the art of the technical personnel may use the above disclosed technical content to change or modify the equivalent changes of equivalent embodiments applied to other fields, but any simple modification, equivalent change and modification of the above embodiments within the technical content of the present application, according to the technical essence of the present application, still belongs to the protection scope of the present application technical scheme.

Claims

1. A backflow prevention device for a gas sampling tube, comprising a tube body (1), characterized in that, an inside of the tube body (1) is provided with a detachable sealing structure (2); one side of the detachable sealing structure (2) is provided with a backflow prevention structure (3); the detachable sealing structure (2) comprises a mounting circular frame (21), an outer surface top of the mounting circular frame (21) is fixedly connected with a bottom of the tube body (1), an inner wall bottom of the mounting circular frame (21) is fixedly installed with a gas pump (22), an output end and an input end of the gas pump (22) are respectively communicated with an air inlet pipe (23) and an air outlet pipe (24), and the air inlet pipe (23) is fixedly installed with the bottom inner wall of the mounting circular frame (21); the backflow prevention structure (3) comprises a fixed circular rod (33), a top end of the fixed circular rod (33) is slidingly connected with a sliding circular cylinder (34), and a top of the sliding circular cylinder (34) is fixedly connected with a blocking cover (36).

2. The anti-backflow device for a gas sampling tube according to claim 1, characterized by: a bottom of the tube body (1) is fixedly connected with a connecting pipe (25), and the connecting pipe (25) is fixedly installed with the air outlet pipe (24).

3. The anti-backflow device for a gas sampling tube according to claim 1, characterized by: an opening side inner wall of one side of the tube body (1) is threadedly connected with a threaded hole (26), an inner wall of the threaded hole (26) is threadedly connected with an external thread circular frame (27), and an outer surface one side of the external thread circular frame (27) is fixedly connected with a cover plate (28).

4. A backflow prevention device for a gas sampling tube according to claim 3, wherein: an outer surface one side of the cover plate (28) is fixedly connected with a connecting circular frame (29), an outer surface one side of the connecting circular frame (29) is fixedly connected with a connecting circular rod (210), and an outer surface one end of the connecting circular rod (210) is fixedly connected with a blocking block (214).

5. A backflow prevention device for a gas sampling tube according to claim 4, wherein: a connecting place of the connecting circular rod (210) and the blocking block (214) is fixedly connected with an auxiliary circular plate (211), an outer surface bottom of the auxiliary circular plate (211) is fixedly connected with a first sealing ring block (212), and an inner wall bottom of the tube body (1) is provided with a first sealing ring groove (213).

6. The anti-backflow device for a gas sampling tube according to claim 3, characterized by: an inner wall of the cover plate (28) is provided with a circular through hole (31), a bottom of the cover plate (28) is provided with a second sealing ring groove (32), and an outer surface top of the blocking cover (36) is fixedly connected with a second sealing ring block (38).

7. The anti-backflow device for a gas sampling tube according to claim 4, characterized by: an inner wall of the connecting circular frame (29) is provided with a rectangular through hole (37), an outer surface of the fixed circular rod (33) is sleeved with a reset spring (35), and two ends of the reset spring (35) are fixedly connected with the sliding circular cylinder (34) and the connecting circular frame (29) respectively.

8. The anti-backflow device for a gas sampling tube according to claim 6, characterized by: a top of the cover plate (28) is provided with a third sealing ring groove (39), an inner wall of the circular through hole (31) is inserted with a ventilation cannula (310), an outer surface of the ventilation cannula (310) is fixedly connected with an auxiliary ring plate (311), an outer surface bottom of the auxiliary ring plate (311) is fixedly connected with a third sealing ring block (312), and an inner wall of the ventilation cannula (310) is provided with a ventilation circular hole (313) below the auxiliary ring plate (311).