CN202717232U - Oil tank oil leakage detection device - Google Patents

Abstract

The utility model relates to an oil tank oil leakage detection device, which comprises an optical sensing probe, a light source, a photoelectric detection device and an alarming device, wherein the optical sensing probe comprises a pentaprism, an incoming-end optical fiber, an outgoing-end optical fiber, a first collimator which is arranged on the incoming-end optical fiber and a second collimator which is arranged on the outgoing-end optical fiber. Due to the adoption of the oil tank oil leakage detection device, technical problems that the existing radar liquid level detection is active and subject to the electromagnetic interference, blind areas exist, complexity in installation exists, the price is high and the size is large can be solved; multi-point distributed-type liquid level detection can be realized, and oil waste, environment pollution and potential risks caused by too much oil mass can be prevented; and compared with a radar liquid level measurement device, the oil tank oil leakage detection device has advantages of passiveness, no electromagnetic interference, remote transmission and monitoring, high sensitivity, no blind area, simplicity in installation, low price, small size and the like.

Description

A kind of oil leakage detecting device for oil tank

Technical field

The utility model relates to a kind of oil leakage detecting device for oil tank.

Background technology

The Large Oil Storage tank arrangement, the valve input of usually oil at the bottom of by tank, because the volume of oil tank is larger, highly higher, therefore need to detect oil level in the oil tank, otherwise can cause oil to emerge in a large number, namely cause a large amount of wastes of oil product, again because the inflammable and explosive performance of oil causes environmental pollution and potential danger.

Mostly adopt at present the radar level gauging device in the large-scale oil storage tank, as shown in Figure 1, in the oil tank exit radar 9 is installed, this device has a lot of shortcomings: active, be subject to electromagnetic interference, have the blind area, install complicated, price is high, volume is large etc.

Summary of the invention

For solve existing radar level detect active, be subject to electromagnetic interference, have the blind area, complicated, high, the bulky technical matters of price be installed, the utility model provides a kind of passive oil leakage detecting device for oil tank.

Technical solution of the present utility model:

A kind of oil leakage detecting device for oil tank comprises optical sensing probe, light source, Electro-Optical Sensor Set and warning device,

Its special character is: described optical sensing probe comprises the pentaprism structure, be arranged on the first collimator on the pentaprism structure incident end optical fiber and be arranged on the second collimator on the pentaprism structure exit end optical fiber,

Described light source inputs to the pentaprism structure through first collimator, and described pentaprism structure exports Electro-Optical Sensor Set to through the second collimator, and described Electro-Optical Sensor Set is connected with warning device,

Described pentaprism structure comprises the sealing pentagon that the first reflection limit a, the second reflection limit b, the 3rd reflection limit c, the 4th reflection limit d and the 5th reflection limit e surround, and wherein the 5th reflection limit e is horizontal sides,

Angle between the first reflection limit a and the second reflection limit b is θ 2, angle between the second reflection limit b and the 3rd reflection limit c is θ 3, angle between the 3rd reflection limit c and the 4th reflection limit d is θ 4, angle between the first reflection limit a and the 5th reflection limit e is θ 1, angle between the 5th reflection limit e and the 4th reflection limit d is θ 5

θ 1 satisfies: α 1≤θ 1≤α 2

Total internal reflection occurs in air must satisfy angle of incidence:

$\mathrm{\&alpha;}1\&GreaterEqual;\arcsin \frac{n_0}{{\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="DEST\_PATH\_HDA00001969666900011.png,DEST\_PATH\_HDA00001969666900012.png"\; state="\{\{state\}\}">n</figure-callout>}}_2}$

In oil, do not satisfy the total reflection condition angle of incidence:

$\mathrm{\&alpha;}2\&le;\arcsin \frac{n_1}{{\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="DEST\_PATH\_HDA00001969666900011.png,DEST\_PATH\_HDA00001969666900012.png"\; state="\{\{state\}\}">n</figure-callout>}}_2}$

The ratio of refraction of air: n ₀

The ratio of refraction of oil: n ₁

The ratio of refraction of prism: n ₂

θ5＝θ1；

θ2＝2θ1；

θ3＝θ4＝θ2。

The utility model has advantages of:

1, the utility model adopts photoelectric system to measure, and the photoelectric system response time is short, and system sensitivity is high, and the combination of a plurality of probe can realize the measurement of multiple spot Distributed Liquid Level.

When 2, using the utility model device sensing probe is placed the maximum oil storage position of oil tank, when giving the oil tank oil transportation, when oil level arrives when exceeding most oil level and putting and touch probe, system semaphore flicker and at once warning, prompting stops oil-filled and valve-off, prevents that effectively oil-filled amount from too much causing waste and environmental pollution and the potential danger of oil at once.

3, the utility model compare with the radar level gauging device have advantages of passive (safe) but, be not subjected to electromagnetic interference long-distance transmissions and monitoring, highly sensitive, do not have blind area, simple installation, price is low, volume is little etc.

Description of drawings

Fig. 1 is structure of the detecting device schematic diagram of the present utility model;

Fig. 2 is the structural representation of oil leakage detecting device for oil tank of the present utility model;

Fig. 3 is the structural representation of the utility model photoelectric probe;

Fig. 4 is the photoelectric probe schematic diagram of a kind of embodiment of the utility model;

Wherein Reference numeral is: 1-light source, 2-optical fiber, 3-first collimator, 4-pentaprism structure, 5-the second collimator, 7-photodetector, 8-warning device, 9-radar, 10-oil tank, 11-optical sensing probe.

The specific embodiment

As shown in Figure 1, a kind of oil leakage detecting device for oil tank, comprise optical sensing probe 4, light source 1, first collimator 3, the second collimator 5, Electro-Optical Sensor Set 7 and warning device 8, light source inputs to the optical sensing probe through first collimator, the optical sensing probe exports Electro-Optical Sensor Set to through the second collimator, Electro-Optical Sensor Set is connected with warning device

Sensing probe of the present invention adopts the pentaprism structure, as shown in Figure 3,

Because this probe will satisfy simultaneously and Fresnel reflection not occur and Fresnel reflection occurs in air in oil.If: because light all above-mentioned total reflection condition will occur at a, b, c, d face, can be calculated by above-mentioned total reflection principle and calculate according to this θ 2, θ 3, θ 4, θ 5.

The pentaprism structure comprises the first reflection limit a, the second reflection limit b, the 3rd reflection limit c, the sealing pentagon that the 4th reflection limit d and the 5th reflection limit e surround, wherein the 5th reflection limit e is horizontal sides, angle between the first reflection limit a and the second reflection limit b is θ 2, angle between the second reflection limit b and the 3rd reflection limit c is θ 3, angle between the 3rd reflection limit c and the 4th reflection limit d is θ 4, angle between the first reflection limit a and the 5th reflection limit e is θ 1, angle between the 5th reflection limit e and the 4th reflection limit d is θ 5

θ 1 satisfies: α 1≤θ 1≤α 2

Total internal reflection occurs in air must satisfy angle of incidence:

$\mathrm{\&alpha;}1\&GreaterEqual;\arcsin \frac{n_0}{{\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="DEST\_PATH\_HDA00001969666900011.png,DEST\_PATH\_HDA00001969666900012.png"\; state="\{\{state\}\}">n</figure-callout>}}_2}$

In oil, do not satisfy the total reflection condition angle of incidence:

$\mathrm{\&alpha;}2\&le;\arcsin \frac{n_1}{{\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="DEST\_PATH\_HDA00001969666900011.png,DEST\_PATH\_HDA00001969666900012.png"\; state="\{\{state\}\}">n</figure-callout>}}_2}$

The ratio of refraction of air: n ₀

The ratio of refraction of oil: n ₁

The ratio of refraction of prism: n ₂

θ5＝θ1；

θ2＝2θ1；

θ3＝θ4＝θ2。

Principle of work of the present invention:

As shown in Figure 2, utilize optical sensing probe surrounding medium ratio of refraction difference and produce the principle of Fresnel reflection; The light that light source sends is transferred to the collimation that first collimator 3 is realized light by optical fiber 2, and directly collimated light is impinged perpendicularly in the pentaprism, light in pentaprism through four total internal reflections, again by 5 outgoing of the second collimator, through after the optical fibre transmission, enter Electro-Optical Sensor Set, drive annunciator and signal lamp warning by photoelectric switching circuit, to realize the detection of liquid level.When probe places air, satisfy the Fresnel reflection condition, from the second collimator 5 light output is arranged, system is in readiness for action; Touch probe and work as pasta one, because the ratio of refraction of oil does not satisfy the Fresnel reflection condition greater than air, do not have light output in the second collimator 5, system semaphore glimmers immediately and sends alarm sound.This advantage of system is highly sensitive, and the photoelectric system response time is short, and the combination of a plurality of probe can realize the measurement of multiple spot Distributed Liquid Level.During use this device sensing probe is placed the maximum oil storage position of oil tank, when giving the oil tank oil transportation, when oil level arrives when exceeding most oil level and putting and touch probe, system semaphore flicker and at once warning, prompting stops oil-filled and valve-off, prevents that effectively oil-filled amount from too much causing waste and environmental pollution and the potential danger of oil at once.

Embodiment 1:

As shown in Figure 4, for example: if prism adopts K9 glass

The ratio of refraction of air: n ₀=1

The ratio of refraction of oil: n ₁=1.47

The ratio of refraction of prism: n ₂=1.56

Can be calculated:

α1≥39.8°

α2≤70.44°

1≤70.44 ° of 39.8 °≤θ of angle of incidence gets θ 1=67.5 °, can calculate according to this 4=135 ° of θ 2=θ 3=θ, 1=67.5 ° of θ 5=θ.

This device of comparing with the radar level gauging device has, passive (safe), but be not subjected to electromagnetic interference long-distance transmissions and monitoring, highly sensitive, do not have blind area, simple installation, price is low, volume is little.

Claims (3)

1. an oil leakage detecting device for oil tank comprises optical sensing probe, light source, Electro-Optical Sensor Set and warning device,

It is characterized in that: described optical sensing probe comprises pentaprism structure, incident end optical fiber, exit end optical fiber, be arranged on the first collimator on the incident end optical fiber and be arranged on the second collimator on the exit end optical fiber,

Described light source inputs to the pentaprism structure through first collimator, and described pentaprism structure exports Electro-Optical Sensor Set to through the second collimator, and described Electro-Optical Sensor Set is connected with warning device,

Described pentaprism structure comprises the sealing pentagon that the first reflection limit (a), the second reflection limit (b), the 3rd reflection limit (c), the 4th reflection limit (d) and the 5th reflection limit (e) surround, and wherein the 5th reflection limit (e) is horizontal sides,

Angle between the first reflection limit (a) and the second reflection limit (b) is θ 2, angle between the second reflection limit (b) and the 3rd reflection limit (c) is θ 3, angle between the 3rd reflection limit (c) and the 4th reflection limit (d) is θ 4, angle between the first reflection limit (a) and the 5th reflection limit (e) is θ 1, angle between the 5th reflection limit (e) and the 4th reflection limit (d) is θ 5

Satisfy following relation: α 1≤θ 1≤α 2; θ 5=θ 1; θ 3=θ 4=θ 2=2 θ 1;

Wherein: α 1 must satisfy angle of incidence for total internal reflection occurs in the air:

α 2 is not for satisfying the total reflection condition angle of incidence in oil:

The ratio of refraction of air: n ₀

The ratio of refraction of oil: n ₁

The ratio of refraction of prism: n ₂

2. oil leakage detecting device for oil tank according to claim 1 is characterized in that: described pentaprism structure adopts K9 glass,

Described pentaprism structure adopts K9 glass,

Then 39.8 °≤θ is 1≤70.44 °,

79.6°≤θ3=θ4=θ2≤140.88°，θ5=θ1。

3. oil leakage detecting device for oil tank according to claim 2 is characterized in that: described pentaprism structure adopts K9 glass, gets θ 1=67.5 °, can calculate according to this 4=135 ° of θ 2=θ 3=θ, 1=67.5 ° of θ 5=θ.

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