Arrayed optical fiber gas sensor protection device for pipe gallery

Abstract

The utility model relates to pipe gallery gas detection technical field especially is arrayed optical fiber gas sensor protection device for pipe gallery, device includes first optical cable locking subassembly, optical fiber device chamber subassembly, gas sensing chamber subassembly and second optical cable locking subassembly, wherein, first optical cable locking subassembly is connected with optical fiber device chamber subassembly respectively, and optical fiber device chamber subassembly is fixedly installed with optical fiber device, gas sensing chamber subassembly is fixedly installed with optical fiber gas sensing device, second optical cable locking subassembly is connected and fixed with gas sensing chamber subassembly respectively, a kind of multi-joint type optical fiber gas sensor structure of the utility model has multiple optical device installation chamber, and the flexible installation and effective protection of optical fiber gas sensor each device are easy.

Description

Technical Field

[0001] This utility model relates to the field of gas detection technology for utility tunnels, and in particular to a protective device for array-type fiber optic gas sensors used in utility tunnels. Background Technology

[0002] Urban utility tunnels are an important part of urban construction. They contain important transmission lines such as heating pipes, gas pipes, telecommunications pipelines, water supply pipelines, and power pipelines. Because urban utility tunnels are located underground and are relatively enclosed with poor ventilation, they are prone to the accumulation of flammable, explosive, and toxic gases, thus creating safety hazards. Therefore, gas monitoring in urban utility tunnels is of great significance to ensure their safe operation.

[0003] In recent years, array-type fiber optic gas sensing technology has been proposed, combining laser spectroscopy and distributed fiber optic sensing technologies. It can be used for monitoring multiple locations and multiple gas components in pipe racks. However, the internal space of pipe racks is small, with numerous pipelines and a complex structure. In order to achieve stable detection and monitoring, an array-type fiber optic gas sensor protection structure that is reliable, stable, easy to install and deploy, and meets the operational requirements of the complex environment of pipe racks is needed. Utility Model Content

[0004] To address the issue that array-type fiber optic gas sensor structures are unsuitable for urban utility tunnel applications, this invention provides a protection device for array-type fiber optic gas sensors used in utility tunnels. This structure features multiple optical component mounting chambers, facilitating flexible installation and effective protection of each component of the fiber optic gas sensor; it also includes a fiber optic cable mounting and locking structure for reliable connection of the fiber optic gas sensor; and a movable joint structure allows for flexible deployment of the array-type fiber optic gas sensor, meeting the complex layout requirements of utility tunnel environments.

[0005] In a first aspect, the present invention provides an array-type fiber optic gas sensor protection device for pipe racks, which adopts the following technical solution:

[0006] An array-type fiber optic gas sensor protection device for pipe racks includes: a first optical cable locking assembly, an optical fiber device chamber assembly, a gas sensing chamber assembly, and a second optical cable locking assembly. The first optical cable locking assembly connects the optical cable to the optical fiber device chamber assembly, and the optical fiber device chamber assembly is fixedly equipped with an optical fiber device. The gas sensing chamber assembly is fixedly equipped with an optical fiber gas sensor. The second optical cable locking assembly connects to and secures the optical cable to the gas sensing chamber assembly.

[0007] Furthermore, the first optical cable locking assembly includes a locking nut, a locking sleeve, a sealing ring, and a joint head structure, wherein one end of the joint head structure has a thread that matches the locking nut, and the optical cable passes through the sealing ring and the locking sleeve is locked by the thread between the joint head structure and the locking nut to fix the optical cable.

[0008] Furthermore, the optical fiber device chamber assembly consists of two semi-cylindrical covers, including an upper cover and a lower cover, which are fixed together by screws to form a cylindrical closed and tight structure. The first end of the cylindrical closed and tight structure is a joint socket structure, and the second end is a joint head structure. The first end is connected to the joint socket of the gas sensing chamber assembly, and the second end is connected to the joint head of the first optical cable locking assembly.

[0009] Furthermore, the upper and lower covers of the optical fiber device chamber assembly have optical device fixing and mounting grooves for fixing and protecting the optical fiber device and the optical fiber splice.

[0010] Furthermore, the gas sensing chamber assembly consists of two semi-cylindrical covers, including an upper cover and a lower cover, which are fixed together by screws to form a cylindrical closed and airtight structure.

[0011] Furthermore, the first end of the cylindrical closed and tight structure is a joint socket structure, and the second end is a joint head structure. The first end is connected to the joint head of the optical fiber device chamber assembly, and the second end is connected to the joint socket of the second optical cable locking assembly.

[0012] Furthermore, the upper cover of the gas sensing chamber assembly has a mounting groove for fixing optical devices; the lower cover of the gas sensing chamber assembly has a mounting groove for fixing a gas chamber.

[0013] Furthermore, the cover of the air chamber installation area is provided with ventilation holes, and a breathable, waterproof and dustproof film and a pressure cover are installed on the ventilation hole area.

[0014] Furthermore, the second optical cable locking assembly includes a locking nut, a locking sleeve, a sealing ring, and a joint socket structure, wherein one end of the joint socket structure has a thread that matches the locking nut, and the optical cable passes through the sealing ring and the locking sleeve is locked by the thread between the joint socket structure and the locking nut to fix the optical cable.

[0015] Furthermore, a sealant is applied between the articular head and the articular socket.

[0016] In summary, this utility model has the following beneficial technical effects:

[0017] This utility model discloses a multi-joint fiber optic gas sensor structure, which has multiple optical device mounting chambers, facilitating flexible installation and effective protection of each component of the fiber optic gas sensor; it has an optical cable mounting and locking structure, enabling reliable connection of the fiber optic gas sensor; and it has a movable joint structure, enabling flexible deployment of the column-type fiber optic gas sensor, which can meet the complex deployment requirements in pipe gallery scenarios. Attached Figure Description

[0018] Figure 1 This is a structural diagram of an array-type fiber optic gas sensor protection device for pipe racks according to an embodiment of this utility model.

[0019] Figure 2 Another structural diagram of an array-type fiber optic gas sensor protection device for pipe racks according to an embodiment of this utility model.

[0020] Figure 3 An exploded view of the structure of an array-type fiber optic gas sensor protection device for pipe racks according to an embodiment of this utility model.

[0021] Figure 4 This utility model provides a structural diagram of the optical fiber device chamber assembly according to an embodiment.

[0022] Figure 5 Structural diagram of the gas sensing chamber assembly according to an embodiment of this utility model.

[0023] Among them, 100 is the first optical cable locking assembly; 200 is the optical fiber device chamber assembly; 300 is the gas sensing chamber assembly; 400 is the second optical cable locking assembly; 101 is the locking nut; 102 is the locking sleeve; 103 is the sealing ring; 104 is the joint head structure; 201 is the upper cover of the optical fiber device chamber; 202 is the lower cover of the optical fiber device chamber; 301 is the upper cover of the gas sensing chamber; 302 is the lower cover of the gas sensing chamber; 303 is the breathable, waterproof and dustproof membrane; 304 is the pressure cap; 401 is the locking nut; 402 is the locking sleeve; 403 is the sealing ring; 404 is the joint head structure. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings.

[0025] Example 1

[0026] Reference Figure 1This embodiment of a pipe gallery array-type fiber optic gas sensor protection device includes: a first optical cable locking assembly 100, an optical fiber device chamber assembly 200, a gas sensing chamber assembly 300, and a second optical cable locking assembly 400. The first optical cable locking assembly 100 connects the optical cable to the optical fiber device chamber assembly 200, and the optical fiber device chamber assembly 200 is fixedly equipped with an optical fiber device. The gas sensing chamber assembly 300 is fixedly equipped with an optical fiber gas sensor. The second optical cable locking assembly 400 connects and fixes the optical cable to the gas sensing chamber assembly 300. The first optical cable locking assembly 100 includes a locking nut 401, a locking sleeve 402, and a joint head structure 104. One end of the joint head structure 104 has a thread that matches the locking nut 401. The optical cable passes through the locking sleeve 402, and the locking sleeve 402 is locked by the thread between the joint head structure 104 and the locking nut 401 to fix the optical cable. The fiber optic device chamber assembly 200 consists of two semi-cylindrical covers, including an upper cover 201 and a lower cover 202, which are fixed together by screws to form a cylindrical, closed, and airtight structure. The first end of the cylindrical closed and airtight structure is a joint socket structure 104, and the second end is a joint head structure 404. The first end connects to the joint socket of the gas sensing chamber assembly 300, and the second end connects to the joint head of the first optical cable locking assembly 100. The two covers of the fiber optic device chamber assembly 200 contain optical device mounting slots for fixing and protecting the fiber optic devices and fiber optic splices.

[0027] The gas sensing chamber assembly 300 consists of two semi-cylindrical covers, including an upper gas sensing chamber cover 301 and a lower gas sensing chamber cover 302, which are fixed with screws to form a cylindrical closed and tight structure. The first end of the cylindrical closed and tight structure is a joint socket structure 104, and the second end is a joint head structure 404. The first end connects to the joint head of the fiber optic device chamber assembly 200, and the second end connects to the joint socket of the second optical cable locking assembly 400. The upper cover of the gas sensing chamber assembly 300 has an optical device fixing and mounting groove; the lower cover of the gas sensing chamber assembly 300 has a gas chamber fixing and mounting groove; the lower cover in the gas chamber mounting area has ventilation holes, and a breathable, waterproof, and dustproof membrane 303 and a pressure cap 304 are installed above the ventilation hole area. The second optical cable locking assembly 400 includes a locking nut 401, a locking sleeve 402, and a joint socket structure 404. One end of the joint socket structure 404 has a thread that matches the locking nut 401. The optical cable passes through the locking sleeve 402, and the locking sleeve 402 is locked in place by the thread between the joint socket structure 404 and the locking nut 401, thus securing the optical cable. Sealing grease is applied between the joint head and the joint socket.

[0028] As a further implementation method,

[0029] The protective structure for an array-type fiber optic gas sensor in a pipe gallery according to this embodiment consists of a first optical cable locking assembly 100, an optical fiber device chamber assembly 200, a gas sensing chamber assembly 300, and a second optical cable locking assembly 400.

[0030] like Figure 2 As shown, the first optical cable locking assembly 100 is used to connect and fix the optical cable to the optical fiber device chamber assembly 200. The first optical cable locking assembly 100 consists of a locking nut 401, a locking sleeve 402, a joint head structure 104, wherein one end of the joint head structure 104 has a thread that matches the locking nut 401. The optical cable passes through the locking sleeve 402, and the locking sleeve 402 is locked by the thread between the joint head structure 104 and the locking nut 401 to fix the optical cable.

[0031] like Figure 3 As shown, the fiber optic device chamber assembly 200 is used to fix and protect the fiber optic device. The fiber optic device chamber assembly 200 consists of two semi-cylindrical covers, which are fixed with screws to form a cylindrical closed and tight structure. One end of the cylindrical closed and tight structure is a joint head structure 104, and the other end is a joint socket structure 404, which are used to connect with the joint socket of the gas sensing chamber assembly 300 and the joint head of the first optical cable locking assembly 100, respectively. The two covers of the fiber optic device chamber assembly 200 have optical device fixing and mounting grooves to facilitate the fixing and protection of the fiber optic device and the optical fiber splice.

[0032] like Figure 4 As shown, the gas sensing chamber assembly 300 is used to fix and protect the fiber optic gas sensor. The gas sensing chamber assembly 300 consists of two semi-cylindrical covers, which are fixed with screws to form a cylindrical closed and tight structure. One end of the cylindrical closed and tight structure is a joint head structure 104, and the other end is a joint socket structure 404, which are used to connect with the joint head of the fiber optic device chamber assembly 200 and the joint socket of the second optical cable locking assembly 400, respectively. The upper cover of the gas sensing chamber assembly 300 has a mounting groove for fixing optical devices to facilitate the fixing and protection of fiber optic devices and fiber optic splices. The lower cover of the gas sensing chamber assembly 300 has a gas chamber fixing groove to facilitate the fixing and protection of the fiber optic gas sensor gas chamber device. The lower cover in the gas chamber installation area is provided with vent holes. A breathable, waterproof and dustproof membrane 303 and a pressure cover 304 are installed on the vent hole area to allow ambient gas to enter the interior of the gas sensing chamber assembly 300 smoothly and to prevent dust and water from entering and contaminating the gas chamber sensor device.

[0033] The second optical cable locking assembly 400 is used to connect and fix the optical cable to the gas sensing chamber assembly 300. The second optical cable locking assembly 400 consists of a locking nut 401, a locking sleeve 402, a joint socket structure 404, wherein one end of the joint socket structure 404 has a thread that matches the locking nut 401. The optical cable passes through the locking sleeve 402, and the locking sleeve 402 is locked by the thread between the joint socket structure 404 and the locking nut 401 to fix the optical cable.

[0034] In a protective structure for an array-type fiber optic gas sensor in a pipe gallery, each matching joint head and joint socket is coated with sealing grease, which improves the flexibility of joint bending and prevents the entry of dust and other contaminants.

[0035] Working principle:

[0036] 1. Optical fiber signal input:

[0037] The input optical cable is secured and sealed by the first optical cable locking assembly (including a sealing ring and a locking nut) to prevent moisture / dust intrusion. The optical signal then enters the optical fiber device chamber assembly through this assembly.

[0038] Signal processing:

[0039] Optical devices (such as couplers and splitters) within the fiber optic device chamber assembly process the optical signal and then transmit it to the gas sensing chamber assembly via the joint head-joint structure (coated with sealant).

[0040] Gas detection:

[0041] The processed optical signal enters the gas sensing chamber and interacts with the gas to be measured (e.g., through the principle of laser spectral absorption), causing changes in the optical signal (intensity / spectral characteristics).

[0042] Signal output:

[0043] The detected optical signal is output to the analysis instrument via the second optical cable locking assembly, or returned to the analysis equipment along the original path.

[0044] 2. Core Protection Mechanism

[0045] (1) Chamber sealing protection

[0046] Dual-chamber isolation design:

[0047] Fiber optic device chamber: protects non-sensoring optical devices (such as fiber optic connectors) and isolates them from the external environment.

[0048] Gas sensing chamber: Specifically designed to house gas-sensitive sensors (such as gas chamber probes), allowing selective gas permeation through a breathable, waterproof, and dustproof membrane (such as PTFE).

[0049] Cylindrical sealing structure:

[0050] Each chamber is secured by upper and lower cylindrical covers with screws to form a sealed space. Sealing grease is applied to the joints to prevent contaminants from entering.

[0051] (2) Balance between breathability and waterproofness

[0052] Gas sensing chamber lower cover vent:

[0053] Allows gas from the pipe gallery to diffuse into the chamber.

[0054] Thin film capping structure:

[0055] Secure the breathable membrane with a pressure cap to ensure the membrane adheres tightly to the vent area, achieving:

[0056] Gas passage: The target gas (such as CH4, H2S) enters freely.

[0057] Blocking contaminants: Preventing liquid water and dust from entering the gas chamber, thus avoiding sensor contamination and failure.

[0058] (3) Flexible deployment and mechanical protection

[0059] Multi-joint structure:

[0060] The components are connected by articulated heads and sockets (which can rotate 360°) to adapt to the curved and narrow cable routing paths of the utility tunnel.

[0061] Mounting slot fixation:

[0062] The cavity is equipped with a mounting slot for optical devices / air chambers to prevent the devices from shifting or being damaged under vibration or impact.

[0063] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. An arrayed optical fiber gas sensor protection device for use in a pipe gallery, characterized by, include: The first optical cable locking assembly comprises an optical fiber device chamber assembly, a gas sensing chamber assembly, and a second optical cable locking assembly. The first optical cable locking assembly connects the optical cable and the optical fiber device chamber assembly, and the optical fiber device chamber assembly is fixedly equipped with an optical fiber device. The gas sensing chamber assembly is fixedly equipped with an optical fiber gas sensor. The second optical cable locking assembly connects and fixes the optical cable and the gas sensing chamber assembly.

2. The array-type fiber optic gas sensor protection device for pipe racks according to claim 1, characterized in that, The first optical cable locking assembly includes a locking nut, a locking sleeve, a sealing ring, and a joint head structure. One end of the joint head structure has a thread that matches the locking nut. After the optical cable passes through the sealing ring and the locking sleeve, it is fixed by locking the thread between the joint head structure and the locking nut.

3. The array-type fiber optic gas sensor protection device for pipe racks according to claim 2, characterized in that, The fiber optic device chamber assembly consists of two semi-cylindrical covers, including an upper cover and a lower cover. The two covers are fixed with screws to form a cylindrical closed and tight structure. The first end of the cylindrical closed and tight structure is a joint socket structure, and the second end is a joint head structure. The first end is connected to the joint socket of the gas sensing chamber assembly, and the second end is connected to the joint head of the first optical cable locking assembly.

4. The array-type fiber optic gas sensor protection device for pipe racks according to claim 3, characterized in that, The upper and lower covers of the optical fiber device chamber assembly have optical device fixing and mounting slots for fixing and protecting the optical fiber device and optical fiber splice.

5. The array-type fiber optic gas sensor protection device for pipe racks according to claim 4, characterized in that, The gas sensing chamber assembly consists of two semi-cylindrical covers, including an upper cover and a lower cover. The two covers are fixed together by screws to form a cylindrical closed and airtight structure.

6. The array-type fiber optic gas sensor protection device for pipe racks according to claim 5, characterized in that, The first end of the cylindrical closed and tight structure is connected to the joint head of the optical fiber device chamber assembly, and the second end is connected to the joint socket of the second optical cable locking assembly.

7. The array-type fiber optic gas sensor protection device for pipe racks according to claim 6, characterized in that, The upper cover of the gas sensing chamber assembly has a mounting groove for fixing optical devices; the lower cover of the gas sensing chamber assembly has a mounting groove for fixing the gas chamber.

8. The array-type fiber optic gas sensor protection device for pipe racks according to claim 7, characterized in that, The lower cover of the gas sensing chamber assembly has ventilation holes, and a breathable, waterproof, and dustproof membrane and a pressure cap are installed on the ventilation hole area.

9. A protective device for a pipe gallery using an array-type fiber optic gas sensor according to claim 8, characterized in that, The second optical cable locking assembly includes a locking nut, a locking sleeve, a sealing ring, and a joint socket structure. One end of the joint socket structure has a thread that matches the locking nut. The optical cable passes through the sealing ring, and the locking sleeve is locked by the thread between the joint socket structure and the locking nut to fix the optical cable.

10. A protective device for a pipe gallery using an array-type fiber optic gas sensor according to claim 9, characterized in that, The joint head and joint socket are both coated with sealant.

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