CN212204053U - Leakage sensor - Google Patents

Abstract

The utility model discloses a liquid leaks sensing element. The utility model discloses a leak the sensor and include: the optical fiber cable comprises a lower shell, an oil absorption resin, a silicon rubber film, an optical fiber and a limiting block, wherein the lower shell is made of rigid materials, the lower shell is provided with an upper opening cavity, the oil absorption resin is placed in the cavity of the lower shell, the silicon rubber film is placed on the oil absorption resin, the optical fiber and the limiting block are provided with two sections of optical gratings, two ends of the optical fiber respectively extend out of the lower shell, an oil collecting groove is formed in the lower face of the lower shell, and a through. The utility model has the advantages of as follows: the monitoring signal used on site is an optical signal, so that the system is intrinsically safe, completely meets the use requirements of flammable and explosive places, is easy to install and fix, is convenient to operate and has good maintainability; the sensor has small volume and relatively low cost; the sensitivity is high, and the influence of temperature on monitoring parameters can be eliminated; the false alarm rate can be greatly reduced, and the reliability is high.

Description

Leakage sensor

Technical Field

The present invention relates to a sensor, and more particularly to a sensor for detecting liquid leakage.

Background

In oil pipeline transportation, real-time monitoring of leakage is required, especially for some key easy leakage points, such as: the real-time fixed-point monitoring of the butt joint of the pipeline, the flange, the valve and the like is more important. The existing method mainly adopts an ultrasonic method and a sound wave method for monitoring, has inaccurate positioning, certain situations of missing report and false report, and has poor overall application effect.

Disclosure of Invention

The utility model provides a can overcome the not enough leakage sensing device that can real-time, fixed point monitoring of prior art.

The utility model discloses a leakage sensor, include: the optical fiber cable is characterized in that a lower shell provided with an upper opening cavity is made of a rigid material, oil-absorbing resin is placed in the cavity of the lower shell, a silicon rubber film is placed on the oil-absorbing resin, two sections of optical fibers and a limiting block are arranged on the lower shell, two ends of the optical fibers respectively extend out of the lower shell, an oil collecting tank is arranged below the lower shell, a through hole communicated with the oil collecting tank is formed in the lower bottom of the opening cavity, the upper surface of the silicon rubber film arranged on the upper surface of the oil-collecting resin is flush with the upper surface of the lower shell, the optical fibers are arranged on the upper surface of the lower shell, one section of the optical fibers passes through the upper surface of the silicon rubber film at the cavity, and the limiting block is located above the silicon rubber film at the cavity and is not contacted. The utility model discloses at the during operation, take place when leaking, the fluid of leakage is absorbed by oil absorption resin material promptly for its volume increases, and the bulging force increases, forces the diaphragm also to begin the bulging deformation, thereby arouses the reflection wavelength change of the grating above that, thereby realizes leaking the sensing.

Preferably, the utility model discloses a leakage sensor is provided with two sections gratings that have different interval grids on the optic fibre that uses on it respectively, and one of them section grating is used for monitoring the leakage condition through the silicon rubber film upper surface of cavity department, wherein through the silicon rubber film upper surface of cavity department, and the grating that is located the silicon rubber film scope outside is used for detecting the temperature parameter of pipeline. Because the utility model discloses the detectable is reported the temperature variation of monitoring department to can eliminate the influence of temperature to the leak detection numerical value variation, make the leak detection data more accurate, also strengthened leakage sensor's stability of performance.

Preferably, the utility model discloses a leak sensor, its lower casing outside is provided with fixed ear to installation and fixed in monitoring department.

More preferably, the leakage sensor of the present invention is provided with an upper cover outside the lower case, so that the optical fiber can be prevented from being contaminated or damaged, and water can be prevented from entering the lower case.

The utility model has the advantages as follows:

1) the monitoring signal used on site of the utility model is an optical signal, which is intrinsically safe and completely meets the use requirements of inflammable and explosive places;

2) the utility model is easy to install and fix, convenient to operate and good in maintainability;

3) the sensor of the utility model has small volume and relatively low cost;

4) the sensor of the utility model has high sensitivity, and can eliminate the influence of temperature on monitoring parameters;

5) the utility model discloses can greatly reduced misstatement rate, the reliability is high.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic bottom view of fig. 1.

Fig. 3 is a partially enlarged view of the position of the limiting block in fig. 1.

Fig. 4 is a schematic view of a position of the limiting block shown in fig. 3 in a partially used state.

Fig. 5 is a schematic view of the present invention.

In the figure: 1 optic fibre, 2-1 first section grating, 2-2 second section grating, 3 lower casings, 4 silicon rubber films, 5 stoppers, 6 oil absorption resin, 7-1 left fixed ear, 7-2 right fixed ear, 8 upper covers, 9 oil sumps, 10 through-holes, 11 pipeline heat preservation, 12 welding seams, 13 flanges, 14-01 one the utility model discloses a sensor, 14-02 another the utility model discloses a sensor, 14-03 third the utility model discloses a sensor.

Detailed Description

The present invention will be explained in detail with reference to the following embodiments.

The structure of a specific embodiment of the leakage sensor of the present invention is shown in fig. 1, which is composed of a lower housing 3 made of rigid material, an oil-absorbing resin 6, a silicon rubber film 4, a limit block gauge and an optical fiber 1. Wherein: an upper opening cavity is arranged on the lower shell 3, oleoresin 6 is absorbed in the upper opening cavity of the lower shell 3, a thin film 4 made of silicone rubber is arranged on the oil-absorbing resin 6, the upper surface of the thin film 4 made of silicone rubber is flush with the upper surface of the lower shell, the lower surface of the thin film 4 made of silicone rubber is closely contacted with the upper surface of the oil-absorbing resin, an oil collecting tank 9 used for containing leaked oil is arranged below the lower shell 3, and a through hole 6 which is communicated with each other is arranged between the oil collecting tank 9 and the lower bottom of the opening cavity on the lower shell and is used for enabling the leaked oil to be absorbed by the resin, see the attached figure 2. The upper surface of the lower shell 3 is provided with a section of optical fiber on which two gratings 2-1 and 2-2 with different intervals are arranged, the part provided with the grating 2-1 is positioned outside the silicon rubber film part, and the grating 2-2 is arranged above the silicon rubber film 4. A limiting block 5 is arranged above the silicon rubber film 4, and the limiting block 5, the silicon rubber film 4 and the optical fibers thereon are not in contact with each other in a non-working state (i.e. an initial state of the sensor), see fig. 3. In addition, the middle and lower casing 3 of the utility model is also provided with fixing lugs 7-1 and 7-1 for fixing installation, and the fixing lugs can also be directly made of strong magnetic materials, see attached figures 1 and 2. The utility model discloses a sensor can set up in departments such as butt joint, flange, the valve of pipeline when using, like figure 5, sets up in heat preservation department, butt weld and the flange department of pipeline respectively the utility model discloses a sensor.

The utility model discloses in use, when the oil leaks, the oil contacts the utility model discloses an oil absorption resin material in the sensor to being adsorbed by oil absorption resin material 6, making its volume increase, the expansion force increases, forces diaphragm 4 on it to warp, and causes grating 2-2 above that to produce and change, see figure 4, causes grating reflection wavelength to change, thereby passes on out the leakage signal. The utility model provides a grating 2-1 is used for detecting the signal variation volume that arouses by temperature variation to can eliminate the influence of temperature to leak testing numerical value variation, make the leak testing data more accurate, also strengthened leakage sensor's stability of performance.

In the utility model, the limiting block 5 has two functions, the first point limits the maximum variation value, all the produced leakage detectors are ensured to be basically consistent, and the second point prevents the grating from being damaged due to overlarge deformation; the service life, the product performance and the application reliability are improved.

Claims (4)

1. A leak sensor, characterized by comprising: the optical fiber cable comprises a lower shell, an oil absorption resin, a silicon rubber film, an optical fiber and a limiting block, wherein an upper opening cavity is formed in the lower shell, the oil absorption resin is placed in the cavity of the lower shell, the silicon rubber film is placed on the oil absorption resin, at least one section of optical grating is arranged on the optical fiber, two ends of the optical fiber respectively extend out of the lower shell, an oil collecting tank is arranged below the lower shell, a through hole communicated with the oil collecting tank is formed in the lower bottom of the opening cavity, the upper surface of the silicon rubber film, which is arranged on the upper surface of the oil absorption resin, is flush with the upper surface of the lower shell, the optical fiber is arranged on the upper surface of the lower shell, one section of optical grating on the optical fiber passes through the upper surface of the silicon rubber film, and the limiting block is located.

2. The leak sensor according to claim 1, wherein two gratings with different pitches are respectively disposed on the optical fiber, and one of the gratings passes through the upper surface of the silicone rubber membrane at the cavity.

3. The leak sensor according to claim 1 or 2, wherein the outer side of the lower casing is provided with fixing lugs.

4. The leak sensor of claim 3, wherein the lower housing is externally provided with an upper cover.

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