阅读说明：本技术 地下综合管廊光纤防入侵装置 (Underground utility tunnel optic fibre prevents invading device ) 是由 王书正 于 2020-07-15 设计创作，主要内容包括：本发明涉及地下综合管廊防护技术领域,具体为地下综合管廊光纤防入侵装置,包括膜片式差压计和固定在待检测区域一侧的安装头,安装头靠近待检测区域的一端固定套接有弹性棒,弹性棒沿待检测区域的长度方向布设并延伸至待检测区域的另一侧,弹性棒远离安装头的一端外部活动套接有连接弯管,弹性棒位于连接弯管内的端部铰接有连接头,且连接头另一端铰接有活塞,连接弯管的另一端设置有水箱并没入至水下,膜片式差压计包括密封的金属壳体,该金属壳体内设有压力膜片,该压力膜片上固定有光纤光栅,且膜片式差压计的压力膜片的两侧均与连接弯管连通。本发明可避免点式探测容易引起的漏报问题、同时具有结构简单和监测成本低的优点。(The invention relates to the technical field of underground comprehensive pipe gallery protection, in particular to an underground comprehensive pipe gallery optical fiber anti-intrusion device which comprises a diaphragm type differential pressure gauge and an installation head fixed on one side of a to-be-detected region, wherein one end, close to the to-be-detected region, of the installation head is fixedly sleeved with an elastic rod, the elastic rod is arranged along the length direction of the to-be-detected region and extends to the other side of the to-be-detected region, a connection bent pipe is movably sleeved outside one end, away from the installation head, of the elastic rod, the end, located in the connection bent pipe, of the elastic rod is hinged with a connector, the other end of the connector is hinged with a piston, the other end of the connection bent pipe is provided with a water tank and is submerged underwater, the diaphragm type differential pressure gauge comprises a sealed metal shell, a pressure. The invention can avoid the problem of missing report easily caused by point detection, and has the advantages of simple structure and low monitoring cost.)

1. Utility tunnel optic fibre prevents intrusion device, its characterized in that: the detection device comprises a diaphragm type differential pressure gauge (7) and an installing head (1) fixed on one side of a region to be detected, wherein one end, close to the region to be detected, of the installing head (1) is fixedly sleeved with an elastic rod (2), the elastic rod (2) is arranged along the length direction of the region to be detected and extends to the other side of the region to be detected, a connecting bent pipe (5) is movably sleeved outside one end, away from the installing head (1), of the elastic rod (2), the end portion, located in the connecting bent pipe (5), of the elastic rod (2) is hinged with a connector (3), one end, away from the elastic rod (2), of the connector (3) is hinged with a piston (4) matched with the inner peripheral wall of the connecting bent pipe (5), a water tank (6) is arranged at the other end of the connecting bent pipe (5), the end portion of the connecting bent pipe (5, a pressure diaphragm (8) is arranged in the metal shell, a fiber bragg grating (9) is fixed on the pressure diaphragm (8), and two sides of the pressure diaphragm (8) of the diaphragm type differential pressure gauge (7) are communicated with the connecting bent pipe (5);

when elastic rod (2) received the external pressure, elastic rod (2) took place deformation, and the tip of elastic rod (2) drives piston (4) and outwards stimulates, and the water in water tank (6) is inhaled in connecting return bend (5) and makes pressure diaphragm (8) the displacement appear, drives and installs fiber grating (9) on the diaphragm center and takes place deformation, realizes the detection to external invasion action through measuring the change of the characteristic wavelength that fiber grating (9) reflect.

2. The underground utility tunnel fiber optic intrusion prevention device of claim 1, wherein the fiber grating (9) is attached to the pressure diaphragm (8) by means of an adhesive.

3. The underground utility tunnel fiber optic intrusion prevention device of claim 1, wherein the pressure diaphragm (8) is a metal diaphragm.

4. The underground utility tunnel fiber optic intrusion prevention device of claim 1, wherein the water tank (6) is an open water tank (6).

Technical Field

The invention relates to the technical field of underground comprehensive pipe gallery protection, in particular to an optical fiber anti-intrusion device for an underground comprehensive pipe gallery.

Background

The utility tunnel, also known as a common ditch, is a municipal public tunnel which implements unified planning, design, construction and maintenance and is built underground in cities and used for centrally laying various municipal pipelines such as water supply, drainage, gas, electric power, communication and the like.

Because there are a large amount of cable optical cables and metallics in utility tunnel, consequently the people are stolen to cause utility tunnel safe operation accident to take place occasionally, and equipment facilities only lets illegal intruder obtain few interests after being stolen, but brings the potential safety hazard and direct economic loss to the inside safe operation of pipe rack and will immeasurable.

The optical fiber cable laid by communication has high value and high theft probability, so that an intrusion detection system or device is required to be designed to find illegal intrusion behaviors in time, and the existing detection system is provided with a monitoring system based on an interference structure, a fiber grating vibration technology and the like. Based on the optical fiber interference principle, the problems of slightly high false alarm rate and detection blind area exist because the detection frequency band is wide and the cost is high and the detection frequency band belongs to discontinuous distribution. Perimeter products based on fiber grating vibration technology connect fiber grating vibration sensor in series into vibration detection array, attach to the protective screen, can report to the police to the invasion action, but this type of current need lay a large amount of sensors, the structure is complicated, has the problem with high costs equally.

Disclosure of Invention

The invention aims to provide an underground comprehensive pipe gallery optical fiber anti-intrusion device which can avoid the problem of missing report easily caused by point detection and has the advantages of simple structure and low monitoring cost.

The above object of the present invention is achieved by the following technical solutions:

the utility model provides an underground pipe gallery optical fiber anti-intrusion device, which comprises a diaphragm type differential pressure gauge and an installation head fixed on one side of a region to be detected, one end of the mounting head, which is close to the area to be detected, is fixedly sleeved with elastic rods, the elastic rods are distributed along the length direction of the area to be detected and extend to the other side of the area to be detected, the outside of one end of the elastic rod, which is far away from the mounting head, is movably sleeved with a connecting bent pipe, the end part of the elastic rod, which is positioned in the connecting bent pipe, is hinged with a connector, and one end of the connector far away from the elastic rod is hinged with a piston matched with the inner peripheral wall of the connecting bent pipe, the other end of the connecting bent pipe is provided with a water tank, and the end of the connecting elbow is submerged under water, the diaphragm type differential pressure gauge comprises a sealed metal shell, a pressure diaphragm is arranged in the metal shell, a fiber grating is fixed on the pressure diaphragm, and two sides of the pressure diaphragm of the diaphragm type differential pressure gauge are communicated with the connecting bent pipe;

when the elastic rod receives external pressure, the elastic rod deforms, the end of the elastic rod drives the piston to pull outwards, water in the water tank is sucked into the connecting bent pipe, the pressure diaphragm is made to displace, the fiber bragg grating installed on the center of the diaphragm is driven to deform, and external intrusion behavior is detected by measuring the change of characteristic wavelength reflected by the fiber bragg grating.

In the underground comprehensive pipe gallery optical fiber anti-intrusion device, the optical fiber grating is attached to the pressure diaphragm in a bonding mode.

In the underground comprehensive pipe gallery optical fiber anti-intrusion device, the pressure diaphragm is a metal diaphragm.

In the underground comprehensive pipe gallery optical fiber anti-intrusion device, the water tank is an open water tank.

Compared with the prior art, the invention provides an underground comprehensive pipe gallery optical fiber anti-intrusion device, which has the beneficial effects that: according to the invention, the elastic rod deforms due to invasion and is converted into the displacement of the pressure diaphragm on the diaphragm type differential pressure gauge, so that the fiber bragg grating is driven to deform to achieve the purpose of monitoring, and the problem of missing report caused by improper sensitivity setting possibly introduced by point type detection can be avoided; meanwhile, the device has the advantages of simple structure and low monitoring cost.

Drawings

Fig. 1 is a schematic structural diagram of an optical fiber intrusion prevention device according to the present invention.

In the figure: 1. a mounting head; 2. an elastic rod; 3. a connector; 4. a piston; 5. connecting a bent pipe; 6. a water tank; 7. a diaphragm type differential pressure gauge; 8. a pressure diaphragm; 9. and (3) fiber gratings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.