A gas capture detection tube

Abstract

The present invention relates to a gas capture detection tube, which comprises: a permeable membrane inner tube, a reinforcing rib is arranged on the outer side of the permeable membrane inner tube, and the permeable membrane inner tube and the reinforcing rib are integrally formed; an outer sheath tube, the outer sheath tube is arranged on the outer side of the permeable membrane inner tube, a gap is left between the permeable membrane inner tube and the outer sheath tube, and a plurality of ventilation holes are evenly opened on the outer sheath tube. The present invention has a simple structure and good flexibility, and can realize the leaked gas capture process under the negative pressure, normal pressure and pressurized state of the inner tube.

Description

Technical Field

[0001] The invention relates to a detection tube for gas capture and relates to the technical field of gas leakage monitoring. Background Art

[0002] Safety accidents caused by leakage of gas pressure vessels or pressure pipelines have always been the core of enterprise safety protection. In order to prevent accidents, it is necessary to monitor the leakage status of gas pressure vessels or pressure pipelines. There are many types of gas leakage monitoring technologies, which can be divided into direct monitoring and indirect monitoring according to different monitoring signals. The direct monitoring method is a technology that directly captures the leaked gas through the use of a detection tube and analyzes the leaked gas. Compared with indirect monitoring technologies such as infrasonic method and optical fiber method, direct monitoring technology has a low false alarm rate because it can capture the leaked gas and identify the characteristics of the leaked gas, and can more accurately reflect the leakage status.

[0003] At present, there are not many technologies for direct monitoring of gas leaks, and research on the core of direct monitoring technology for gas leaks - detection tubes is even less reported. The prior art discloses a detection tube, which is composed of an inner support layer, a membrane layer, and an outer woven protective layer. This type of detection tube can achieve the purpose of gas capture, but the structure is complex, the preparation process is more, and the stainless steel mesh sheath cannot be used in a buried environment, and is not suitable for buried pipeline leakage monitoring. The prior art also discloses a detection tube, which includes four layers, from the outside to the inside, a perforated stainless steel inner tube, a non-woven material layer, a solvent-resistant film layer, and a surface coating. This type of tube has a complex structure and is made of a composite of four layers of materials. The manufacturing cost is high, and the stainless steel inner tube has a large rigidity. For long-distance pipeline leakage monitoring, a long tube length is required, which is difficult to transport. The perforated inner tube has an enhanced mixing effect on the captured leaked gas, which will weaken the leakage signal identification and is not suitable for long-distance pipeline leakage monitoring.

[0004] In summary, although the existing leak gas capture detection tube designs can also achieve the purpose of leak gas capture, the existing designs all have some inherent defects, so it is necessary to further improve the detection tube for pipeline leakage monitoring. Summary of the invention

[0005] In view of the above problems, an object of the present invention is to provide a gas capture detection tube which can directly identify the characteristics of leaked gas and has a low false alarm rate.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: a gas capture detection tube, the detection tube comprising:

[0007] A permeable membrane inner tube, wherein a reinforcing rib is arranged on the outer side of the permeable membrane inner tube, and the permeable membrane inner tube and the reinforcing rib are integrally formed;

[0008] An outer sheath tube is disposed on the outer surface of the permeable membrane inner tube, a gap is left between the permeable membrane inner tube and the outer sheath tube, and a plurality of ventilation holes are evenly opened on the outer sheath tube.

[0009] Furthermore, the outer wall of the permeable membrane inner tube is configured as a corrugated protrusion, and the inner wall of the permeable membrane inner tube is smooth.

[0010] Furthermore, the gap between the inner tube of the permeable membrane and the outer sheath tube is 1-5 mm.

[0011] Furthermore, the reinforcing rib adopts a spiral support skeleton, and the spiral support skeleton is made of stainless steel wire, copper wire or hard resin material, and the pitch is 0.1-1 times the inner diameter of the inner tube of the permeable membrane. If the spiral support skeleton is filamentary, the wire diameter is 1-7mm, and if the spiral support skeleton is strip-shaped, the width is 0.1-0.5 times the inner diameter of the inner tube of the permeable membrane, and the thickness is 1-7mm.

[0012] Furthermore, the permeable membrane inner tube is made of a rubbery polymer material, the inner diameter of the permeable membrane inner tube is 10-50 mm, and the thickness of the permeable membrane inner tube is 1-5 mm.

[0013] Furthermore, the wall thickness of the outer protective casing is 1-5 mm, the casing compressive strength is greater than 0.5 MPa, and the bending radius is not greater than 2 m.

[0014] Furthermore, the diameter of the through hole is between 1-10 mm, and the distance between adjacent holes is 2-6 times the diameter of the through hole.

[0015] Furthermore, the outer protective casing is made of hard resin, and rodent repellent is added during the production of the outer protective casing to prevent rodents from gnawing at the tube body.

[0016] The present invention adopts the above technical solution, and has the following characteristics:

[0017] 1. The detection tube for capturing leaked gas can capture leaked gas without the need for the driving force of the internal and external pressure difference of the gas, and can withstand the external pressure of the buried area, thus meeting the convenience of processing and construction;

[0018] 2. The detection tube of the present invention has only two layers, and the leaked gas can diffuse into the inner tube of the detection tube quickly. The inner wall of the inner tube is smooth, which has a small mixing effect on the captured leaked gas, making the leakage signal more obvious. The outer sheath tube can withstand a certain external pressure and meet the requirements of the buried environment. It is suitable for long-distance pipeline leakage monitoring. Therefore, the present invention can directly identify the characteristics of the leaked gas, with a low false alarm rate and good monitoring performance;

[0019] In summary, the present invention has a simple structure, good flexibility of the tube body, can be quickly installed and disassembled, can realize the leakage gas capture process under negative pressure, normal pressure and pressurized conditions in the inner tube, has a high leakage gas permeation flux, and has low resistance along the fluid in the tube. It is an indispensable and important component of the detection system based on the leakage gas capture principle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the assembly of the detection tube of the present invention;

[0021] Figure 2 It is a cross-sectional view of the inner tube of the permeable membrane with reinforcing ribs of the present invention;

[0022] The reference numerals in the figure are: 1. outer sheath tube, 2. permeable membrane inner tube, 3. through hole, 4. spiral support skeleton, 5. corrugated protrusion. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] like Figure 1 , Figure 2 As shown, the gas capture detection tube provided in this embodiment includes an outer sheath tube 1 and a permeable membrane inner tube 2. The outer sheath tube 1 is sheathed on the outer side of the permeable membrane inner tube 2, and a gap is left between the permeable membrane inner tube 2 and the outer sheath tube 1.

[0025] The outer sheath tube 1 can be made of hard resin, and a plurality of ventilation holes 3 are evenly formed on the outer sheath tube 1 .

[0026] The permeable membrane inner tube 2 can be made of rubber polymer material, and reinforcing ribs 4 are arranged on the outside of the permeable membrane inner tube 2. Specifically, the reinforcing ribs 4 can be a spiral support skeleton made of stainless steel wire, copper wire or hard resin material to resist external and internal pressures, wherein the permeable membrane layer inner tube 2 and the spiral support skeleton are integrally formed.

[0027] In a preferred embodiment, the gap between the outer sheath tube 1 and the permeable membrane inner tube 2 is 1-5 mm. The gap between the two can fully utilize the compressive stiffness of the outer sheath tube 1 itself to protect the permeable membrane inner tube 2. In addition, the gap also provides conditions for the leaked gas to quickly diffuse into the permeable membrane inner tube 2.

[0028] In a preferred embodiment, the outer wall of the permeable membrane inner tube 2 has corrugated protrusions 5, and the inner wall of the permeable membrane inner tube 2 is smooth. The inner diameter of the permeable membrane inner tube 2 can be 10-50 mm, and the thickness of the permeable membrane inner tube 2 can be 1-5 mm.

[0029] In a preferred embodiment, the pitch of the spiral support skeleton is 0.1-1 times the inner diameter of the permeable membrane inner tube 2. If the spiral support skeleton is filamentary, the wire diameter is 1-7 mm. If the spiral support skeleton is strip-shaped, the width is 0.1-0.5 times the inner diameter of the permeable membrane inner tube 2 and the thickness is 1-7 mm.

[0030] In a preferred embodiment, the wall thickness of the outer sheath tube 1 is 1-5 mm, the compressive strength of the outer sheath tube 1 is greater than 0.5 MPa, and the bending radius of the outer sheath tube 1 is no greater than 2 m.

[0031] In a preferred embodiment, the diameter of the through hole 3 is 1-10 mm, and the distance between adjacent through holes is 2-6 times the hole diameter.

[0032] In a preferred embodiment, rodent repellent is added to the outer sheath tube 1 to prevent rodents from gnawing and thus avoid damage to the detection tube.

[0033] The following describes in detail the use of the gas capture detection tube of the present invention through specific embodiments:

[0034] The gas capture detection tube of this embodiment is composed of an outer sheath tube 1 with holes and an inner tube 2 with a permeable membrane. The inner diameter of the permeable membrane inner tube 2 is 16 mm, the reinforcing ribs of the permeable membrane inner tube 2 are made of 0.5 mm stainless steel wire, the pitch of the reinforcing ribs is 0.1 times the inner diameter, and the membrane thickness of the permeable membrane inner tube is 2 mm. The outer sheath tube 1 has a diameter of 20 mm, a wall thickness of 2 mm, a pressure resistance of up to 0.5 MPa, and no obvious deformation occurs when the burial depth reaches 20 m. The outer sheath tube 1 has a bending radius of 2 m, a through hole 3 has a diameter of 3 mm, and a hole spacing of 1.8 cm between the through holes 3. The outer sheath tube 1 is made of a material containing a rodent repellent.

[0035] One or more gas capture detection tubes of this embodiment are placed in parallel to the top or side of the pipeline to be tested. When a leak occurs in the pipeline to be tested, under the action of the gas concentration difference, after a certain diffusion time, the leaked gas passes through the outer sheath tube 1 and enters the permeable membrane inner tube 2. The gas diffused into the tube can be transported to the detection station for analysis through external transmission equipment.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present application is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that after reading the present application, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the protection scope of the claims to be approved.

Claims

1. A gas capture detection tube, characterized in that: The test tube includes: A permeable membrane inner tube, wherein a reinforcing rib is arranged on the outer side of the permeable membrane inner tube, and the permeable membrane inner tube and the reinforcing rib are integrally formed; the reinforcing rib adopts a spiral support skeleton, and the spiral support skeleton is made of stainless steel wire, copper wire or hard resin material, and the pitch is 0.1-1 times the inner diameter of the permeable membrane inner tube. If the spiral support skeleton is filamentary, the wire diameter is 1-7mm, and if the spiral support skeleton is strip-shaped, the width is 0.1-0.5 times the inner diameter of the permeable membrane inner tube, and the thickness is 1-7mm; the outer wall of the permeable membrane inner tube is set as a corrugated protrusion, and the inner wall of the permeable membrane inner tube is smooth; An outer sheath tube, the outer sheath tube is arranged outside the permeable membrane inner tube, a gap is left between the permeable membrane inner tube and the outer sheath tube, and a plurality of ventilation holes are evenly opened on the outer sheath tube; the diameter of the through holes is between 1-10 mm, and the spacing between adjacent through holes is 2-6 times the aperture of the through holes; The outer protective sleeve is made of hard resin, and rat repellent is added during the production of the outer protective sleeve to prevent rodents from gnawing on the tube body.

2. The gas capture detection tube according to claim 1, characterized in that: The gap between the inner tube of the permeable membrane and the outer sheath tube is 1-5 mm.

3. The gas capture detection tube according to any one of claims 1 to 2, characterized in that: The permeable membrane inner tube is made of rubber polymer material, the inner diameter of the permeable membrane inner tube is 10-50 mm, and the thickness of the permeable membrane inner tube is 1-5 mm.

4. The gas capture detection tube according to any one of claims 1 to 2, characterized in that: The wall thickness of the outer protective casing is 1-5 mm, the casing compressive strength is greater than 0.5 MPa, and the bending radius is not greater than 2 m.

Images