Valve box oil leakage monitoring device

Abstract

The utility model relates to the technical field of oil leakage monitoring, and particularly provides a valve box oil leakage monitoring device. The oil leakage monitoring device for the valve box comprises an optical transmitting unit, an optical element, an optical receiving unit, a signal processing unit, a signal processing unit and a signal processing unit, wherein the optical element is used for transmitting light beams and is arranged in a to-be-detected area; the optical element is used for receiving the light beams transmitted by the optical transmitting unit and refracting the light beams; the signal processing unit is used for receiving the light beams refracted by the optical element; the light intensity comparison unit is used for comparing light intensity emitted by the optical emitting unit with light intensity received by the optical receiving unit. According to the valve box oil leakage monitoring device, the situation that an existing sensor is damaged due to oil corrosion is avoided, and the leakage situation can be detected when a small amount of oil in the valve box leaks.

Description

Technical Field

[0001] This utility model relates to the field of oil leakage monitoring technology, and in particular to a valve box oil leakage monitoring device. Background Technology

[0002] Valve boxes are critical components of industrial systems. They rely on oil for lubrication and sealing, but oil leaks can pollute the environment, damage equipment, and even cause fires. To address valve box oil leaks, based on the corrosive chemical properties of oil, corrosion-based oil leak sensors have been developed. These sensors work by corroding the sensor material upon contact with it, causing the material to shrink or deform. This corrosion then compresses the conductive material surrounding the sensing wire, creating a short circuit and triggering an alarm. This allows for timely detection of valve box leaks, ensuring the safe and stable operation of industrial systems.

[0003] However, oil leak sensors based on corrosive substances may, on the one hand, be damaged during the detection process, affecting their lifespan. On the other hand, the detection speed is affected by the corrosiveness of the oil, and it may be impossible to detect even minor leaks. Utility Model Content

[0004] This invention addresses the aforementioned problems. It provides a valve box oil leakage monitoring device that not only avoids the damage to existing sensors due to oil corrosion, but also detects leaks even when only a small amount of oil leaks into the valve box.

[0005] According to one aspect of the present invention, a valve box oil leakage monitoring device is provided, comprising:

[0006] An optical emitting unit, used to emit a beam of light;

[0007] An optical element arranged in the area to be detected is used to receive the light beam emitted by the optical emitting unit and to refract the light beam;

[0008] An optical receiving unit is used to receive a light beam refracted by the optical element;

[0009] The signal processing unit connected to the optical receiving unit is used to compare the intensity of light emitted by the optical emitting unit with the intensity of light received by the optical receiving unit.

[0010] Compared with existing technologies, the valve box oil leakage monitoring device provided by this utility model includes an optical emitting unit, an optical receiving unit, and an optical element arranged in the area to be detected. The optical emitting unit emits a light beam into the optical element in the area to be detected, so that the light beam is refracted within the optical element and then output to the optical receiving unit. During this process, if a small amount of oil leakage occurs in the valve box, the leaked oil will adhere to the surface of the optical element arranged in the area to be detected. When the light beam emitted by the optical emitting unit reaches the optical element, during refraction, the oil molecules absorb energy consistent with their characteristic frequency, i.e., the energy in the light beam, causing the intensity of the light after refraction by the optical element to attenuate, resulting in a smaller intensity of light entering the optical receiving unit. At this time, the signal processing unit can determine whether there is an oil leakage in the area to be detected by comparing the intensity of the light beam received by the optical receiving unit with the intensity of the light beam emitted by the optical emitting unit. Even with a trace amount of oil leakage, as long as oil molecules adhere to the optical element, it will trigger the absorption of light energy, thus forming a detectable intensity difference, solving the problem that existing corrosion-based sensors are difficult to detect in the case of trace amounts of oil leakage.

[0011] Meanwhile, since the entire detection process is based on the principle of light energy absorption and refraction, the optical emitting unit, optical elements, and optical receiving unit will not undergo chemical reactions or physical damage with oil. This avoids the situation where existing sensors are damaged by oil corrosion, significantly extends the service life of the device, and reduces the cost of frequent sensor replacements.

[0012] Based on this, the detection speed of the valve box oil leakage monitoring device in this embodiment is not affected by the corrosiveness of the oil. As long as the oil substance exists and absorbs light energy of a specific frequency, the change in light intensity will be captured by the optical receiving unit in real time. The signal processing unit can quickly complete the intensity comparison and make a response. Compared with the detection speed of the prior art which is limited by the corrosiveness of the oil, the response is faster, which provides support for industrial systems to discover potential oil leakage hazards earlier and take timely measures. Attached Figure Description

[0013] The above and other objects, features, and advantages of this utility model will become more apparent from the more detailed description of the embodiments thereof in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this utility model and form part of the specification. They are used together with the embodiments of this utility model to explain the utility model and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0014] Figure 1 This is a schematic diagram of the valve box oil leakage monitoring device provided in this embodiment of the utility model;

[0015] Figure label:

[0016] 100 - Optical transmitting unit, 200 - Optical element, 300 - Optical receiving unit, 400 - Signal processing unit, 500 - Housing. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model more apparent, exemplary embodiments according to this utility model will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this utility model, and not all embodiments of this utility model. It should be understood that this utility model is not limited to the exemplary embodiments described herein.

[0018] In industrial systems, valve boxes are critical components for controlling the flow and switching of fluid media. Their internal components typically require lubrication, sealing, or hydraulic transmission via oil. Oil leaks can trigger a series of serious problems. Leaking oil pollutes the surrounding environment, and in precision industrial settings, it can corrode the metal components of the valve box and related equipment, leading to accelerated wear, decreased sealing performance, and even valve box malfunction, affecting the stable operation of the entire system. Furthermore, the flammable nature of oil poses a fire hazard.

[0019] Currently, monitoring methods for valve box oil leaks have significant limitations. Traditional manual observation methods rely on periodic inspections, which are insufficient for real-time detection of minute leaks in their initial stages. Furthermore, the detection rate is high due to the experience and responsibility of the inspectors. To address valve box oil leaks, based on the corrosive chemical properties of oil, corrosion-based oil leak sensors are now available. The working principle of this sensor is as follows: when oil comes into contact with the sensor, the corrosion causes the sensor material to shrink or deform, which in turn squeezes the conductive material surrounding the sensing wire, causing a short circuit and triggering an alarm. This allows for timely detection of valve box leaks, ensuring the safe and stable operation of industrial systems.

[0020] However, oil leak sensors based on corrosive substances present several challenges. First, during detection, the sensor comes into direct contact with the corrosive oil, causing continuous damage to the sensor material. This damage manifests not only as shrinkage or deformation but can also lead to structural failure over time. Second, the detection speed is significantly affected by the corrosiveness of the oil. Different types of oil vary considerably in their corrosiveness. For less corrosive oils, it takes longer for the sensor material to undergo sufficient morphological changes to trigger an alarm, resulting in decreased detection efficiency. Furthermore, in cases of minute oil leaks, the amount of leaked oil is so small that the corrosive effect is insufficient to cause the sensor material to shrink or deform enough to trigger a short circuit. This prevents timely detection of the leak, potentially allowing a small leak to escalate into a serious incident and create a safety hazard.

[0021] To address the aforementioned problems, this utility model provides a valve box oil leakage monitoring device, which not only avoids the damage of existing sensors due to oil corrosion, but also detects leakage when a small amount of oil leaks into the valve box.

[0022] Figure 1 A schematic diagram of the valve box oil leakage monitoring device provided in an embodiment of this utility model is shown. Figure 1 As shown, the valve box oil leakage monitoring device of this utility model embodiment includes an optical emitting unit 100, an optical element 200 arranged in the area to be detected, an optical receiving unit 300, and a signal processing unit 400 connected to the optical receiving unit 300. The optical emitting unit 100 is used to emit a light beam, the optical element 200 is used to receive the light beam emitted by the optical emitting unit 100 and the refracted light beam, the optical receiving unit is used to receive the light beam refracted by the optical element 200, and the signal processing unit 400 is used to compare the intensity of the light emitted by the optical emitting unit 100 with the intensity of the light received by the optical receiving unit 300.

[0023] In actual operation, the optical emitting unit 100 continuously emits a stable intensity light beam, which is directionally transmitted to the optical element 200 arranged in the area to be detected. Under normal circumstances, i.e., when there is no oil leakage in the valve box, there is no oily substance adhering to the surface of the optical element 200. The light beam propagates at the optical element 200 according to the inherent refraction law, and the intensity of the light beam after refraction is almost undiminished. The intensity of the light beam received by the optical receiving unit is basically the same as the intensity of the light beam emitted by the optical emitting unit 100. After comparison, the signal processing unit 400 determines that there is no leakage.

[0024] When a small amount of oil leaks from the valve box, the leaked oil penetrates into the detection area and adheres to the surface of the optical element 200, altering the refraction environment of the light beam at the optical element 200. During beam refraction, the molecules of the oil absorb light energy matching their characteristic frequency, weakening the energy of the beam after refraction by the optical element 200, and consequently reducing the intensity of the beam received by the optical receiving unit. Then, the signal processing unit 400 compares the intensity of the light emitted by the optical transmitting unit 100 with the intensity of the light received by the optical receiving unit in real time. Once a significant difference is detected and this difference reaches a preset threshold, an oil leak is quickly determined to have occurred.

[0025] This monitoring method, based on optical principles and the light absorption characteristics of oil substances, can not only respond promptly to minor oil leaks, but also ensures that each unit is not damaged by contact with oil substances, effectively overcoming the shortcomings of existing corrosive sensors.

[0026] In one possible implementation, the optical emitting unit 100 of this disclosure embodiment includes a laser or an LED light source.

[0027] When the laser is used as the optical emitting unit 100, it features good monochromaticity, strong directionality, and high light intensity. Its emitted beam has a single and concentrated frequency, accurately matching the characteristic absorption frequency of oily substances. When oil molecules absorb energy, the attenuation of the beam intensity is more significant, making it easier for the signal processing unit 400 to capture subtle differences, making it particularly suitable for high-precision detection of minute oil leaks. Simultaneously, the strong directionality of the laser reduces beam divergence during transmission, ensuring that more energy reaches the optical element 200 stably, reducing the impact of environmental interference on the detection results. When the LED light source is used as the optical emitting unit 100, it features low power consumption and long lifespan. As the optical emitting unit 100, the LED light source can continuously and stably emit a beam of a specific wavelength, and its manufacturing cost is relatively low, which is beneficial for the large-scale application and cost control of the device.

[0028] It is evident that both the laser and the LED light source can meet the requirements of the optical emission unit 100 for beam stability and specific frequency. Furthermore, neither of them will chemically react with oily substances, thus avoiding performance degradation caused by corrosion from the source and further consolidating the advantages of the device in terms of service life and detection reliability.

[0029] In one optional example, the optical element 200 of this disclosure embodiment includes at least one of an optical prism, an optical mirror, or a grating. The optical element 200 can be used individually or in combination, and can be flexibly selected according to the spatial structure of the area to be detected and the possible diffusion path of the oil leak, further improving the device's sensitivity to detecting minute oil leaks.

[0030] When the optical element 200 in this embodiment uses an optical prism, the optical prism may include a triangular prism, a pentaangular prism, a heptagonal prism, etc., and is preferably a triangular prism. In the valve box oil leakage monitoring scenario, the optical prism can stably receive the light beam emitted by the optical emitting unit 100 and achieve the refraction of the light beam through a specific prism surface.

[0031] For example, one plane of the aforementioned prism serves as both the incident and refracting surface of the light beam. The light beam undergoes two refractions within the prism before being transmitted to the optical receiving unit 300. For instance, a prism has three planes: a top surface and a bottom surface. These three planes can be defined as the first plane, the second plane, and the third plane. The first plane is located close to and parallel to the transmitting and receiving ends of the optical transmitting unit 100 and the optical receiving unit 300. Therefore, the first plane can serve as both the incident and refracting surface of the light beam, undertaking the functions of receiving and outputting the light beam.

[0032] In practical applications, the light beam emitted by the optical emitting unit 100 can be directed towards the first plane of the prism. Since the first plane is parallel to both the emitting and receiving ends, the light beam can be incident almost perpendicularly, minimizing reflection loss during incidence and ensuring the stability of the initial beam intensity. After reaching the first plane, the light beam enters the interior of the prism and propagates within it. It undergoes a first refraction via the second plane, a second refraction via the third plane, and finally returns to the first plane, exiting the prism and being transmitted to the receiving end of the optical receiving unit 300.

[0033] When a small amount of oil leaks and adheres to the prism, the oil film alters the medium environment at which the light beam exits. Simultaneously, during beam propagation, the absorption of light energy by the oil exacerbates changes in light intensity. Specifically, the first refraction occurs at the second plane. If oil diffused due to the leak is present near the beam's propagation path, the oil molecules will absorb energy consistent with their characteristic frequencies, transitioning from lower to higher energy levels, resulting in energy loss for the laser. The beam then undergoes a second refraction at the third plane. If oil remains in this area, it will absorb energy again. After these two energy absorptions, the laser energy is significantly attenuated, and ultimately, only a small portion of the energy is received by the optical receiving unit 300 when the beam exits from the first plane.

[0034] Based on this, by comparing the intensity with the laser emitted by the optical emitting unit 100, the signal processing unit 400 can quickly determine whether a leak has occurred. The multi-plane refraction and energy absorption structure fully utilizes the spatial characteristics of the prism, creating a stable propagation path for the light beam inside the prism and reducing interference from the external environment. The intensity change of the light beam after being refracted twice by the second and third planes and accompanied by two energy absorptions is more significant. Even a very small amount of oil will amplify the energy difference through the two absorption processes, making it easier for the signal processing unit 400 to detect changes caused by minute oil leaks.

[0035] For example, the signal processing unit in this embodiment can be a microprocessor or a programmable logic controller (PLC). The specific choice can be made according to actual needs. For instance, using a microprocessor, after the optical receiving unit converts the received light signal into an electrical signal, it transmits the electrical signal to the microprocessor. The microprocessor internally stores standard electrical signal intensity data (corresponding to a preset light intensity threshold) under no-leakage conditions. Therefore, it compares the received electrical signal with the standard data in real time. When it detects that the electrical signal intensity is lower than the standard value (i.e., the light intensity is lower than the preset threshold), it immediately sends a trigger command to the alarm unit. Using a programmable logic controller, the PLC can receive the electrical signal from the optical receiving unit through the input module, process the signal, and perform logical judgment through its internal program. When it determines that the light intensity is lower than the preset threshold, it controls the alarm unit to act through the output module. Simultaneously, the PLC can also be linked with the industrial control system, outputting control signals to relevant actuators, such as closing the oil inlet valve of the valve box, to reduce losses caused by oil leakage while triggering the alarm. This further realizes the integration of monitoring and control.

[0036] In one example, the optical receiving unit 300 of this embodiment includes a photoelectric sensor or a spectrometer. When the optical receiving unit 300 is a photoelectric sensor, it can convert the received light signal into an electrical signal. It is extremely sensitive to changes in light intensity; even a weak light beam absorbed by oil can be captured and converted into a processable electrical signal, which is then transmitted to the signal processing unit 400 for intensity comparison. When the optical receiving unit 300 is a spectrometer, it can not only detect light intensity but also analyze the spectral composition of the light beam. Because oil has characteristic absorption of light energy at specific frequencies, the spectrometer can accurately determine whether energy absorption is caused by oil by analyzing the spectral changes of the received light beam, thereby more comprehensively confirming the oil leak.

[0037] For example, the valve box oil leakage monitoring device of this embodiment further includes an alarm unit connected to the signal processing unit 400. The alarm unit is used to trigger an alarm signal when the signal processing unit 400 detects that the light intensity is lower than a preset threshold. The alarm unit can send an electrical signal to the control system to promptly alert personnel that the valve box is leaking oil, so that repair measures can be taken quickly to prevent the leakage from worsening. The preset threshold is set based on the light intensity received by the optical receiving unit 300 in a leak-free state. The specific preset threshold is set according to actual needs and is not limited here. When the light intensity falls below the preset threshold due to energy absorption caused by the oil leakage, the signal processing unit 400 immediately sends a command to the alarm unit to trigger an alarm.

[0038] For example, the alarm unit can be selected from an audible alarm unit, a visual alarm unit, or a wireless alarm unit. It is understood that different types of alarm units can adapt to diverse industrial scenarios and further enhance the warning effect of oil leak detection.

[0039] For example, audible alarm units include buzzers and electronic horns. These units emit sound signals at specific frequencies to provide warnings, and the sound propagation is unaffected by visual obstructions. Therefore, even in noisy industrial environments, audible alarm units can quickly penetrate background noise with continuous or intermittent sharp sounds (such as high-frequency buzzing), alerting on-site personnel. Even if personnel are behind equipment or in blind spots, they can still perceive oil leaks through hearing, allowing for timely intervention.

[0040] For example, a light alarm unit includes high-brightness LEDs (such as red and yellow) that operate by remaining constantly lit, flashing, or alternating colors. Light alarm units rely on the visual stimulation of light signals to transmit warning information. Light signals are highly intuitive and provide precise location information. Therefore, workers can quickly pinpoint the approximate area of ​​the oil leak by observing the location of the flashing light. Especially in dimly lit industrial environments (such as underground workshops or nighttime operations), the visibility of light alarms is even higher, effectively compensating for the limitations of sound alarms in visual location.

[0041] For example, wireless alarm units, including those using Wi-Fi or Bluetooth, can remotely transmit alarm signals to monitoring centers, managers' mobile phones, or industrial control systems. This overcomes spatial limitations and is suitable for unattended areas and long-distance monitoring scenarios, such as distributed valve boxes in large factories and remote outdoor equipment. When an oil leak occurs, the wireless alarm unit can push information in real time, allowing managers to grasp the situation promptly regardless of their location, facilitating rapid dispatch of personnel and avoiding delays in response due to the absence of personnel on-site.

[0042] In one example, the three alarm units mentioned above can be used individually or in combination. When used in combination, the multi-dimensional warning methods ensure that valve box oil leakage events can be detected and handled in a timely manner, further enhancing the safety protection capabilities of industrial systems.

[0043] In one possible implementation, the valve box oil leakage monitoring device of this disclosure embodiment further includes a housing 500, with the optical transmitting unit 100, the optical receiving unit 300 and the signal processing unit 400 all located inside the housing 500, and the optical element 200 located outside the housing 500.

[0044] In practical applications, the housing 500 provides excellent protection for the internal optical transmitting unit 100, optical receiving unit 300, and signal processing unit 400, preventing them from being corroded and interfered with by dust, moisture, oil, and other factors in the industrial environment surrounding the valve box. This ensures that these core units can operate stably for a long time, extending their service life. The optical element 200, located outside the housing, is directly exposed to the area to be detected, facilitating timely contact with leaked oil and ensuring timely and accurate monitoring. Simultaneously, the housing design facilitates the overall installation and fixation of the device, maintaining stable relative positions between the units, which is beneficial for the stability of the beam propagation path and further enhances the reliability of the monitoring device.

[0045] For example, the alarm unit is communicatively connected to the signal processing unit, and the alarm unit can be located outside the housing to make the alarm signal more obvious.

[0046] In one example, the housing in this embodiment of the disclosure is an explosion-proof housing. The explosion-proof housing can effectively resist dangerous situations such as explosive impacts and sparks that may occur in industrial environments, preventing electrical components inside the housing (such as the optical emission unit 100, signal processing unit 400, etc.) from causing safety accidents when encountering leaked flammable oil. For the industrial system where the valve box is located, oil leakage itself poses a risk of fire and explosion. The use of an explosion-proof housing further reduces this risk from the perspective of equipment self-protection, adding important protection to the safe operation of the entire industrial system. Furthermore, the explosion-proof housing has superior sealing performance, better isolating external flammable and explosive gases and dust, ensuring that internal units can still operate normally in complex and hazardous environments.

[0047] This embodiment of the valve box oil leakage monitoring device utilizes optical principles and the light absorption characteristics of oil to monitor minute oil leaks in the valve box, effectively overcoming the shortcomings of traditional corrosion-based sensors. An optical emitting unit 100 emits a light beam into an optical element 200 in the detection area, causing the beam to refract within the optical element 200 before being output to the optical receiving unit 300. During this process, if a small oil leak occurs in the valve box, the leaked oil will adhere to the surface of the optical element 200 located in the detection area. When the light beam emitted by the optical emitting unit 100 reaches the optical element 200, the oil molecules absorb energy consistent with their characteristic frequency during refraction, resulting in a decrease in the intensity of the refracted light and a reduction in the intensity of the light entering the optical receiving unit 300. The signal processing unit 400 then determines whether there is an oil leak in the detection area by comparing the difference between the intensity of the light beam received by the optical receiving unit 300 and the intensity of the light beam emitted by the optical emitting unit 100. Even a tiny amount of oil leakage, as long as oil molecules adhere to the optical element 200, will trigger the absorption of light energy, thereby creating a detectable intensity difference.

[0048] Meanwhile, since the entire detection process is based on the principle of light energy absorption and refraction, the optical emitting unit 100, optical element 200, and optical receiving unit 300 will not undergo chemical reactions or physical damage with oil substances. This avoids the situation where existing sensors are damaged by oil corrosion, significantly extends the service life of the device, and reduces the cost of frequent sensor replacements. The detection speed of the valve box oil leakage monitoring device of this embodiment is not affected by the corrosiveness of the oil. As long as the oil substance is present and absorbs light energy of a specific frequency, the change in light intensity will be captured instantly by the optical receiving unit 300, and the signal processing unit 400 can quickly complete the intensity comparison and make a response. Compared with the detection speed of the prior art which is limited by the corrosiveness of the oil, the response is much faster, providing support for industrial systems to detect potential oil leakage hazards earlier and take timely measures.

[0049] The basic principles of this utility model have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this utility model are merely examples and not limitations, and should not be considered as essential features of each embodiment of this utility model. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the utility model from being implemented using the aforementioned specific details.

[0050] The block diagrams of the devices, apparatuses, equipment, and systems involved in this utility model are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” and “having” are open-ended terms meaning “including but not limited to” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to” and is used interchangeably with it.

[0051] Additionally, as used herein, the “or” used in a list of items beginning with “at least one” indicates a separate list, such that a list of, for example, “at least one of A, B, or C” means A or B or C, or AB or AC or BC, or ABC (i.e., A and B and C). Furthermore, the word “exemplary” does not imply that the described example is preferred or better than other examples.

[0052] It should also be noted that in the system and method of this utility model, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this utility model.

[0053] Various changes, substitutions, and modifications can be made to the technology described herein without departing from the teachings defined by the appended claims. Furthermore, the scope of the claims of this utility model is not limited to the specific aspects of the processes, machines, manufacturing processes, events, means, methods, and actions described above. Currently existing or later-developed processes, machines, manufacturing processes, events, means, methods, or actions that perform substantially the same function or achieve substantially the same result as the corresponding aspects described herein can be utilized. Therefore, the appended claims include such processes, machines, manufacturing processes, events, means, methods, or actions within their scope.

[0054] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present invention. Therefore, the present invention is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0055] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present invention to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. A valve box oil leakage monitoring device, characterized in that, include: An optical emitting unit, used to emit a beam of light; An optical element arranged in the area to be detected is used to receive the light beam emitted by the optical emitting unit and to refract the light beam; An optical receiving unit is used to receive a light beam refracted by the optical element; The signal processing unit connected to the optical receiving unit is used to compare the intensity of light emitted by the optical emitting unit with the intensity of light received by the optical receiving unit.

2. The valve box oil leakage monitoring device according to claim 1, characterized in that, The optical emitting unit includes a laser or an LED light source.

3. The valve box oil leakage monitoring device according to claim 1, characterized in that, The optical element includes at least one of an optical prism, an optical mirror, or a grating.

4. The valve box oil leakage monitoring device according to claim 3, characterized in that, The optical prism includes a triangular prism.

5. The valve box oil leakage monitoring device according to claim 4, characterized in that, One of the planes of the prism serves as the incident and refractive surface of the light beam, which is then refracted twice within the prism before being transmitted to the optical receiving unit.

6. The valve box oil leakage monitoring device according to claim 1, characterized in that, The optical receiving unit includes a photoelectric sensor or a spectrum analyzer.

7. The valve box oil leakage monitoring device according to claim 1, characterized in that, The valve box oil leakage monitoring device also includes an alarm unit, which is connected to the signal processing unit. The alarm unit is used to trigger an alarm signal when the signal processing unit detects that the light intensity is lower than a preset threshold.

8. The valve box oil leakage monitoring device according to claim 7, characterized in that, The alarm unit is selected from sound alarm units, light alarm units, or wireless alarm units.

9. The valve box oil leakage monitoring device according to any one of claims 1 to 8, characterized in that, The valve box oil leakage monitoring device also includes a housing, in which the optical transmitting unit, the optical receiving unit and the signal processing unit are all located, and the optical element is located outside the housing.

10. The valve box oil leakage monitoring device according to claim 9, characterized in that, The housing is an explosion-proof housing.

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