CN113125092A - Water leakage detection device and system - Google Patents
Water leakage detection device and system Download PDFInfo
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- 230000003287 optical effect Effects 0.000 claims abstract description 19
- 238000009792 diffusion process Methods 0.000 claims abstract description 17
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- 230000005540 biological transmission Effects 0.000 abstract description 9
- 238000009434 installation Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
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- 230000004888 barrier function Effects 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 description 7
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- 238000004891 communication Methods 0.000 description 2
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- 238000005188 flotation Methods 0.000 description 2
- 238000010187 selection method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
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Abstract
The invention relates to a water leakage detection device and system, and belongs to the technical field of high-voltage direct-current transmission equipment monitoring. Wherein the detection system includes: detecting the container; a laser channel device; an optical transmission device provided at the front end of the optical path; the light receiving device is arranged at the rear end of the light path; the controller is used for controlling the light sending device to send out light beams and judging whether water leaks or not by receiving signals of the light receiving device; the laser channel device is internally provided with a light diffusion device which is used for diffusing incident light to form a diffused light beam; a floater channel is arranged in a way of crossing the diffused light beam and is communicated with the detection container, and a floater is arranged in the floater channel. The invention diffuses the incident light emitted into the laser channel, so that the process requirement and the installation requirement of the laser channel device during manufacturing can be reduced on the basis of light spot expansion, and the light receiving device can receive light signals without barriers, thereby improving the reliability of water leakage detection.
Description
Technical Field
The invention relates to a water leakage detection device and system, and belongs to the technical field of high-voltage direct-current transmission equipment monitoring.
Background
Converter valves are the core equipment of a dc converter station and they generate a lot of heat during operation, and therefore need to be cooled.
At present, a water cooling mode is generally adopted for cooling the high-voltage direct-current transmission converter valve. The water cooling system is an important component of the operation of the converter valve, the requirement on the reliability of a water channel of the water cooling system is very high, the leakage of cooling water seriously harms the safe operation of the converter valve and influences the cooling capacity of the converter valve, and the leaked water can influence and even damage the electrical performance of lower-layer components, so that the water leakage condition of a converter valve tower needs to be monitored in real time on line.
Therefore, the converter valve water leakage detection device is arranged in the high-voltage direct-current converter valve system, and the high-voltage direct-current converter valve water leakage detection device has the main functions of monitoring the water leakage condition of a water channel in a converter valve water cooling system and sending an alarm signal to a protection monitoring system according to the severity of water leakage. Because the electromagnetic environment in the converter valve is relatively complex, the detection device generally adopts an optical signal with strong anti-interference capability and high transmission rate as a communication mode for water leakage detection. From the stability and reliability analysis of the converter valve water cooling system, stable sending and reliable receiving of laser signals of the water leakage detection device are necessary conditions for accurately detecting water leakage conditions of different degrees of the valve tower and effectively protecting the safe operation of the converter valve.
The detection device of the existing commonly used laser signal communication mode is a detection cylinder floating block type water leakage detection device, and the detection device of the type is characterized in that: set up laser emission interface and laser receiving interface at laser channel's both ends, under the not serious condition of leaking or leaking, the interior floating block position of flotation pontoon is lower, can not shelter from laser signal, and laser receiving interface can receive laser signal, and under the serious condition of leaking, the interior floating block position of flotation pontoon is on the high side, blocks laser signal, and then makes laser receiving interface can't receive laser signal to this judges the condition of leaking.
However, due to the characteristics of the laser signal, the detection device has extremely high requirements on the manufacturing process and installation of the laser channel, and once the process has slight error or external interference, the phenomenon of water leakage alarm due to non-water leakage occurs, so that the overall reliability is poor.
Disclosure of Invention
The application aims to provide a water leakage detection device and system, which are used for solving the problems of high process requirement and poor reliability of the existing detection mode.
In order to achieve the above object, the present invention provides a water leakage detection device, including:
the laser channel device is arranged in the detection container;
the optical transmitting device is arranged at the front end of the optical path of the laser channel device;
the light receiving device is arranged at the rear end of the light path of the laser channel device;
the controller is used for controlling the light sending device to send out light beams and judging whether water leaks or not by receiving signals of the light receiving device;
the laser channel device is internally provided with a light diffusion device which is used for diffusing incident light to form a diffused light beam; and a floater channel is arranged in a way of crossing the diffused light beam and is used for communicating the detection container, and a floater is arranged in the floater channel.
The beneficial effects are that: the light diffusion device is arranged in the laser channel device, so that incident light entering the laser channel is diffused, namely, light spots are expanded, on the basis of light spot expansion, the process requirement and the installation requirement of the laser channel device during manufacturing can be reduced, after the light spots are expanded, the light receiving device can receive light signals under the condition of no barrier, the condition of water leakage judgment error caused by other interference is avoided, and the reliability of water leakage detection is improved.
Further, in order to avoid excessive loss of the light beam during transmission, the light diffusion device is a collimating lens.
Further, in order to improve the detection accuracy, the light emitting device is a laser diode, the numerical aperture of the collimating lens is larger than that of the laser diode, and the calculation process of the focal length of the collimating lens is as follows:
wherein f is the focal length of the collimating lens; phi is the set diameter of the diffused beam; θ is the divergence angle of the laser diode.
Further, after the numerical aperture and the focal length of the collimating lens are determined, the actual diameter of the diffused beam is:
d＝2·f·NADiode；
wherein d is the actual diameter of the diffused beam; NADiodeIs the numerical aperture of the laser diode.
Further, in order to avoid excessive light loss caused by light diffusion, a light converging device is further arranged in the laser channel device, and the light converging device is arranged on the diffused light beam and is used for converging the diffused incident light.
Further, in order to avoid excessive loss of the light beam in the transmission process, the light diffusion device and the light convergence device are both collimating lenses and have the same parameters.
Further, in order to improve the detection accuracy, the light emitting device is a laser diode, the numerical aperture of the collimating lens is larger than that of the laser diode, and the calculation process of the focal length of the collimating lens is as follows:
wherein f is the focal length of the collimating lens; phi is the set diameter of the diffused beam; θ is the divergence angle of the laser diode.
Further, after the numerical aperture and the focal length of the collimating lens are determined, the actual diameter of the diffused beam is:
d＝2·f·NADiode；
wherein d is the actual diameter of the diffused beam; NADiodeIs the numerical aperture of the laser diode.
In addition, the present invention further provides a water leakage detection system, including:
a detection container for accumulating water;
the laser channel device is arranged in the detection container;
the optical transmitting device is arranged at the front end of the optical path of the laser channel device;
the light receiving device is arranged at the rear end of the light path of the laser channel device;
the controller is used for controlling the light sending device to send out light beams and judging whether water leaks or not by receiving signals of the light receiving device;
the laser channel device is internally provided with a light diffusion device which is used for diffusing incident light to form a diffused light beam; and a floater channel is arranged in a way of crossing the diffused light beam and is communicated with the detection container, and a floater is arranged in the floater channel.
The beneficial effects are that: the light diffusion device is arranged in the laser channel device, so that incident light entering the laser channel is diffused, namely, light spots are expanded, on the basis of light spot expansion, the process requirement and the installation requirement of the laser channel device during manufacturing can be reduced, after the light spots are expanded, the light receiving device can receive light signals under the condition of no barrier, the condition of water leakage judgment error caused by other interference is avoided, and the reliability of water leakage detection is improved.
Drawings
FIG. 1 is a schematic diagram of the water leak detection system of the present invention;
FIG. 2 is a schematic diagram of a beam transformation in a laser channeling device according to the present invention;
fig. 3 is a schematic diagram of the operation of the collimating lens of the present invention.
Detailed Description
Water leakage detection System embodiment:
the water leakage detection system provided by this embodiment, as shown in fig. 1, includes a water leakage detection device and a detection container, the detection container is a detection cylinder for accumulating water and collecting water leakage, and the water leakage detection device is used for detecting water leakage accumulated in the detection cylinder.
The water leakage detection device comprises a controller (namely a detection control unit), a light sending device, a light receiving device, a laser channel device (laser channel for short) and a floater channel, wherein the light sending device is connected with a control output end of the controller, is arranged at the front end of a light path of the laser channel device and is used for emitting a light beam into the laser channel device; the laser channel device is arranged in the detection container; the light receiving device is arranged at the rear end of the light path of the laser channel device and used for receiving the light beam output from the laser channel device; the controller is used for controlling the light sending device to send out light beams and judging whether water leaks or not by receiving signals of the light receiving device; the laser channel device is internally provided with a light diffusion device which is used for diffusing incident light to form a diffused light beam; the floater channel is arranged in a cross way with the diffused light beams, the floater channel is communicated with the detection container, and a floater is arranged in the floater channel.
In this embodiment, the float channel is perpendicular to the diffused light beam, and as another embodiment, the relative position between the float channel and the diffused light beam is not fixed, so long as the float is ensured to block the laser along a certain path when water is accumulated.
In this embodiment, in order to avoid the erroneous judgment caused by the loss of the laser signal and the failure of receiving the optical signal, the laser channel device is further provided with an optical converging device, and the light converging device is arranged on the diffused light beam and is used for converging the diffused incident light, and in order to further reduce the light loss, the light diffusion device and the light convergence device are coupled and arranged, and are all collimating lenses, and the parameters of the two collimating lenses are the same, as shown in fig. 2, the light diffusing device converts the diverging light beam into parallel collimated light, the light converging device converges the parallel collimated light, as another embodiment, if the laser power is large or the situation that the optical transmission loss is too large does not occur, the light converging device can also be not arranged, and the specific implementation forms of the light diffusion device and the light convergence device are not limited as long as the corresponding functions are realized.
In this embodiment, in order to implement the water leakage alarm, an alarm device may be installed in the detection system, and the alarm device is connected to the controller.
The detection process of the detection system comprises the following steps: when no water exists in the detection cylinder or the water level is low, the floater position of the floater channel is low, so that the laser signal cannot be blocked, the laser signal is diffused into parallel collimated light (namely diffused light beams) of a large light spot after passing through the light diffusion collimating lens, and the parallel collimated light of the large light spot is transmitted to the coupled light converging lens to be converged and then is received by the light receiving device; when the water level in the detection cylinder is high, the float position of the float channel is high, the laser signal is blocked, the parallel collimated light of the large light spot is blocked, the light receiving device cannot receive the laser signal, and then water leakage alarm is carried out.
In order to realize more accurate detection, selection of the collimating lens and its importance, a specific selection method of the collimating lens is given below (the selection method of the collimating lens is the same in the case of only providing the light diffusing device, or providing the light diffusing device and the light converging device).
As shown in FIG. 1, the collimating lens is installed at both ends in the laser channel device, and as the collimating optical element, the aspheric lens does not introduce spherical aberration, and is commonly used for applications requiring a beam diameter of 1-5 mm.
Aspheric lens selection several parameters that need attention:
1) designing a wavelength: the wavelength at which the lens achieves the best effect.
2) Numerical Aperture (NA)Lens): the numerical aperture NA of the lensLensWith maximum angle of light that can be received
The relationship of (1) is:
3) clear Aperture (CA): depending on the design, light can pass through the largest diameter of the curved surface.
4) Effective focal length (EFL, hereinafter focal length) is the distance from the principal plane to the focal point.
5) Magnification: ratio of image size to physical size
6) Wavefront effective error (RMS, WFE) measurement of chromatic aberration (error) in a lens
7) Outer diameter: the diameter of the lens barrel.
8) Working Distance (WD): also called Back Focal Length (BFL) means the focal distance of the back of the lens
9) Center thickness: thickness of the lens in the axial direction.
The above parameters are many, and in the present invention, the focal length and the numerical aperture of the collimator lens (i.e., the parameters of the collimator lens) may be selected. If we use the optical transmission means as a laser diode, the divergence angles in the horizontal and vertical directions are typically 10 ° and 30 °, respectively, according to the specifications of the laser diode, and thus when the light beam propagates, an elliptical light beam will appear. In order to try to collect the light during collimation, a divergence angle of 30 ° is usually chosen in the calculation as shown in fig. 3; the set diameter of the diffused beam, i.e. the set diameter of the parallel collimated beam, is: phi is 3mm (the set diameter here is determined according to the diameter of the laser channel device, i.e. the diameter of the laser channel device is 3 mm).
First, at a set diameter of the diffused beam, the focal length of the collimating lens is selected to be:
wherein f is the focal length of the collimating lens; phi is the set diameter of the diffused beam; theta is the divergence angle of the laser diode, and then a proper lens is selected according to the focal length of the collimating lens.
Secondly, the numerical aperture of the collimating lens is larger than that of the laser diode, and when the numerical aperture of the laser diode is smaller than that of the collimating lens, the light beam emitted by the laser diode is shielded by the collimating lens.
Numerical aperture NA of laser diodeDiodeAnd the divergence angle θ:
NADiode＝n·sin(θ/2)；
where n is the refractive index, and when the numerical aperture of the laser diode is defined in air, the refractive index n of air is 1, so the above formula is simplified and arranged as:
the numerical aperture of the collimating lens and the numerical aperture of the laser diode are judged as follows:
0.3＝NALens＞NADiode≈sin(15°)＝0.26；
the numerical aperture of the laser diode is selected when the control hardware is designed, and the numerical aperture of the laser diode used in the design of the invention is 0.26, so that the numerical aperture of the proper collimating lens is selected according to the numerical aperture of the laser diode. Regarding the numerical aperture of the collimator lens, there is a corresponding specification, and in the case where the numerical aperture of the laser diode is 0.26, the closest collimator lens larger than the numerical aperture of the laser diode has a numerical aperture of 0.3. The final collimator lens was confirmed to have a focal length of 5.6mm and a numerical aperture of 0.3
When a suitable collimating lens is selected, then the actual diameter d of the diffused beam is:
d＝2·f·NADiode；
the actual diameter of the diffused beam is not absolutely equivalent in the calculation formula, and may be approximately equal to the approximate calculation.
According to the parameters, a proper collimating lens can be selected and used on two sides inside the laser channel device for diffusing and converging the optical signals.
The water leakage detection of the invention is not only suitable for the water leakage detection of the converter valve, but also suitable for places needing the water leakage detection.
Water leakage detection device embodiment:
the water leakage detection device provided by the embodiment comprises:
the laser channel device is arranged in the detection container;
the optical transmitting device is arranged at the front end of the optical path of the laser channel device;
the light receiving device is arranged at the rear end of the light path of the laser channel device;
the controller is used for controlling the light sending device to send out light beams and judging whether water leaks or not by receiving signals of the light receiving device;
the laser channel device is internally provided with a light diffusion device which is used for diffusing incident light to form a diffused light beam; and a floater channel is arranged in a way of crossing the diffused light beam and is used for communicating the detection container, and a floater is arranged in the floater channel.
The specific structure and operation of the water leakage detection device are described in the embodiment of the water leakage detection system, and are not described herein.
Claims (9)
1. A water leakage detection device, comprising:
the laser channel device is arranged in the detection container;
the optical transmitting device is arranged at the front end of the optical path of the laser channel device;
the light receiving device is arranged at the rear end of the light path of the laser channel device;
the controller is used for controlling the light sending device to send out light beams and judging whether water leaks or not by receiving signals of the light receiving device;
the laser channel device is internally provided with a light diffusion device which is used for diffusing incident light to form a diffused light beam; and a floater channel is arranged in a way of crossing the diffused light beam and is used for communicating the detection container, and a floater is arranged in the floater channel.
2. The water leak detection device according to claim 1, wherein the light diffusion means is a collimating lens.
3. The water leakage detection device of claim 2, wherein the light emitting device is a laser diode, the numerical aperture of the collimating lens is larger than that of the laser diode, and the calculation process of the focal length of the collimating lens is as follows:
wherein f is the focal length of the collimating lens; phi is the set diameter of the diffused beam; θ is the divergence angle of the laser diode.
4. The water leak detection device of claim 3, wherein after the numerical aperture and the focal length of the collimating lens are determined, the actual diameter of the diffused light beam is:
d＝2·f·NADiode；
wherein d is the actual diameter of the diffused beam; NADiodeIs the numerical aperture of the laser diode.
5. The water leakage detection device of claim 1, wherein a light converging device is further disposed in the laser passage device, and the light converging device is disposed on the diffused light beam for converging the diffused incident light.
6. The water leakage detection device of claim 5, wherein the light diffusion device and the light convergence device are collimating lenses and have the same parameters.
7. The water leakage detection device of claim 6, wherein the light emitting device is a laser diode, the numerical aperture of the collimating lens is larger than that of the laser diode, and the calculation process of the focal length of the collimating lens is as follows:
wherein f is the focal length of the collimating lens; phi is the set diameter of the diffused beam; θ is the divergence angle of the laser diode.
8. The water leak detection device of claim 7, wherein after the numerical aperture and the focal length of the collimating lens are determined, the actual diameter of the diffused light beam is:
d＝2·f·NADiode；
wherein d is the actual diameter of the diffused beam; NADiodeIs the numerical aperture of the laser diode.
9. A water leak detection system, comprising:
a detection container for accumulating water;
the laser channel device is arranged in the detection container;
the optical transmitting device is arranged at the front end of the optical path of the laser channel device;
the light receiving device is arranged at the rear end of the light path of the laser channel device;
the controller is used for controlling the light sending device to send out light beams and judging whether water leaks or not by receiving signals of the light receiving device;
the laser channel device is internally provided with a light diffusion device which is used for diffusing incident light to form a diffused light beam; and a floater channel is arranged in a way of crossing the diffused light beam and is communicated with the detection container, and a floater is arranged in the floater channel.
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Cited By (1)
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