Oil cleanliness online monitoring system and fault judgment method

Abstract

The oil cleanliness online monitoring system comprises a filtering device and a connecting pipeline located on the downstream of the filtering device, and the connecting pipeline comprises an oil taking pipe and an oil returning pipe which are arranged in parallel. The acquisition unit is electrically connected with the monitoring unit and can collect data acquired by the monitoring unit and transmit the data to terminal equipment, the monitoring unit comprises a cavity which is internally provided with two cavities and is used for eliminating bubbles in oil, one side of the cavity is connected with an oil taking pipe, the other side of the cavity is externally connected with two pipelines which are connected in parallel, and the two pipelines are connected in parallel. The downstream of the pipeline is connected with the oil return pipe, and a sensor is arranged on the pipeline. The monitoring unit is internally provided with the cavity for eliminating the bubbles in the oil, the cavity is connected with the two parallel pipelines for discharging the bubbles and the oil, the pipeline for discharging the oil is provided with the sensor, the influence of the bubbles on detection data is avoided through the arrangement of the cavity, meanwhile, the sensor is arranged on the bypass, and the detection accuracy is improved. And the accuracy of detection data is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial inspection, and particularly relates to an on-line monitoring system for oil cleanliness and a fault judgment method. Background Art

[0002] Lubricating oil is increasingly widely used in the mechanical field. The lubricating oil can form a lubricating film inside the equipment, thereby reducing wear. After the lubricating oil is used inside the equipment for a period of time, its viscosity will first decrease and then increase due to high temperature and oxidation, thus affecting the lubrication performance. Secondly, the wear of metal parts inside the equipment will generate impurities such as metal particles, resulting in the pollution of the lubricating oil and affecting the lubrication performance. Therefore, it is necessary to regularly detect the lubricating oil inside the equipment to timely judge and respond to faults.

[0003] For example, a Chinese utility model patent "Lubricating Oil Cleanliness Detection Device" with a patent number of ZL202020581444.X (publication number of CN212341207U) discloses a device for detecting the cleanliness of lubricating oil, including a box body and a box cover. An oil defoaming chamber, an oil detection chamber and a wear detection chamber are arranged inside the box body. Among them, an ultrasonic probe is arranged on the inner chamber wall of the oil defoaming chamber, and an ultrasonic generator is arranged on the outer chamber wall. The ultrasonic probe and the ultrasonic generator are electrically connected to eliminate bubbles in the lubricating oil, thereby improving the accuracy of test data. However, the use of an ultrasonic probe and an ultrasonic generator will result in relatively high costs, and for some high-viscosity oil fluids or specific working conditions, the ultrasonic defoaming effect will be unsatisfactory. At the same time, when the cleanliness of the lubricating oil exceeds level 12, the particle concentration is too high, and the above device exceeds the standard measurement range, resulting in an inability to accurately reflect the cleanliness.

[0004] Therefore, it is necessary to further improve the on-line monitoring system for oil cleanliness and the fault judgment method. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide an on-line monitoring system with accurate oil cleanliness detection data in view of the above-mentioned prior art status.

[0006] The second technical problem to be solved by the present invention is to provide a fault judgment method applied to the above on-line monitoring system in view of the above-mentioned prior art status.

[0007] The technical solution adopted by the present invention to solve the above technical problems is as follows: The on-line monitoring system for oil cleanliness includes:

[0008] A filtering device for filtering large-particle-size particles in the oil fluid;

[0009] A connecting pipeline, which is arranged downstream of the filtering device and externally connected with an oil extraction pipe and a return pipe arranged in parallel.

[0010] It is characterized in that it further includes:

[0011] A monitoring unit, including a cavity for eliminating bubbles in the oil fluid. At least two chambers are arranged in the cavity. One side of the cavity is connected to the oil extraction pipe, and at least two parallel pipes are externally connected to the other side of the cavity. The downstream of the pipes is connected to the return pipe, and sensors for detecting the pollution degree of the oil fluid are arranged on the pipes.

[0012] An acquisition unit, which is electrically connected to the monitoring unit, can collect the data collected by the monitoring unit, and transmit it to the terminal device.

[0013] In order to facilitate the separation of bubbles in the oil fluid, preferably, the cavity includes a first chamber and a second chamber which are arranged at intervals and communicate at the top. A partition part is arranged at the bottom of the first chamber and the second chamber. Among them, under the partitioning action of the partition part, the whole cavity is partitioned into a first chamber and a second chamber which only communicate at the top. The oil fluid enters the first chamber through the oil inlet. The bubbles rise to the upper surface of the oil fluid under the action of pressure and are discharged from the top. The oil fluid after separating the bubbles enters the second chamber from the first chamber through the gap above the partition part, and is finally discharged from the second chamber.

[0014] Furthermore, the pipes include a first pipe and a second pipe arranged in parallel. The first pipe communicates with the tops of the first chamber and the second chamber, and the second pipe communicates with the bottom of the second chamber. Among them, the bubbles continuously rise under the action of pressure and are discharged through the first pipe at the top of the chamber. The oil fluid after separating the bubbles flows from the first chamber into the second chamber. The inlet pipe of the second pipe is inserted into the bottom of the second chamber, so as to discharge the oil fluid in the second chamber along the second pipe.

[0015] In order to avoid the mixing of the oil fluid and the bubbles, preferably, regulating valves for adjusting the flow rate and check valves for controlling the flow direction of the oil fluid are arranged on both the first pipe and the second pipe. Among them, the first pipe is used for exhausting bubbles, and the flow rate will be relatively large. The second pipe is used for discharging the oil fluid, and the flow rate of the oil fluid needs to be adjusted accordingly according to the usage requirements. Therefore, regulating valves for adjusting the flow rate are installed on both the first pipe and the second pipe. At the same time, due to the different pressure differences and flow rates of the first pipe and the second pipe, in order to prevent the separated bubbles and oil fluid from mixing due to backflow, check valves for preventing backflow are also installed on the first pipe and the second pipe respectively, so as to ensure that the flow rates in the two pipes can converge to the oil outlet.

[0016] To enhance the effect of bubble separation, preferably, the monitoring unit further includes a pump. One end of the pump is connected to the oil extraction pipe, and the other end is connected to one side of the first chamber. Here, bubbles exist in the oil. By installing a pump, pressure can be increased in the first chamber, which is beneficial to the separation of bubbles from the interior of the oil. Under the action of pressure, the bubbles will flow upward and gather at the tops of the first chamber and the second chamber, and finally be discharged through the first pipe.

[0017] To improve the integration of the monitoring unit, preferably, the monitoring unit includes a box body for installing components. Oil inlets and oil outlets are arranged at intervals on the side wall of the box body. One side of the oil inlet is connected to the oil extraction pipe, and the other side is connected to the pump. One side of the oil outlet is connected to the outlet pipe, and the other side is connected to the pipeline after the merger of the first pipe and the second pipe. Here, the monitoring unit includes multiple components such as a pump, a first pipe, a second pipe, and a chamber. Concentrating the installation of each component inside the box body can facilitate maintenance and management and prevent damage to the components caused by the external environment. At the same time, the box body is provided with an oil inlet and an oil outlet, which can facilitate the guiding of oil into and out of the monitoring unit.

[0018] To facilitate data feedback, preferably, the acquisition unit includes a data collector and a transmission module. The data collector is used to collect data of the monitoring unit. The transmission module includes a wireless transmission module for transmitting data to the mobile phone side and a wired transmission module for transmitting data to the computer side. Here, the data collector in the acquisition unit can collect the data collected by the monitoring unit. The wireless transmission module and the wired transmission module respectively transmit the data to the mobile phone side and the computer side, thus facilitating users to view the data and enabling timely responses to equipment failures.

[0019] To improve work efficiency, preferably, the filtering device is a filter tank. Here, the filter tank has a large capacity and is suitable for processing a large amount of fluid, thus reducing the need for frequent replacement or cleaning. A filter element is provided inside the filter tank, which can filter particles in the oil.

[0020] To solve the second technical problem, preferably, for oil with a low cleanliness level (cleanliness level ≤ 12), the cleanliness of the oil can be detected by the sensor. The system can set the alarm value range according to the data of the oil cleanliness level, and after being collected by the acquisition unit, the alarm data is transmitted to the computer side or the mobile phone side in real time, so as to analyze and process the failure in a timely manner;

[0021] For oil with a high cleanliness level (cleanliness level > 12), the particulate matter data is recorded through a data algorithm. The system sets multiple groups of alarm values. When the particulate matter exceeds the alarm value and triggers an alarm, the mobile phone side or the computer side receives the alarm information and processes the abnormal state of the equipment in a timely manner.

[0022] Compared with the prior art, the advantages of the present invention are as follows: A cavity for eliminating air bubbles in the oil fluid is provided in the monitoring unit of the on-line monitoring system. Two parallel pipelines are connected to the cavity, which can be used for discharging air bubbles and oil fluid respectively. A sensor for detecting the cleanliness of the oil fluid is also provided on the pipeline for discharging the oil fluid. The setting of the cavity avoids the influence of air bubbles on the detection data. At the same time, the sensor is arranged on the bypass with lower flow rate and pressure, which can further improve the accuracy of the detection data. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the on-line monitoring system in the embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram of the monitoring unit in the embodiment of the present invention.

[0025] In the figure: 1. Filter device; 2. Connecting pipeline; 21. Oil extraction pipe; 22. Oil return pipe; 3. Monitoring unit; 31. Cavity; 311. First chamber; 312. Second chamber; 313. Partition; 32. Sensor; 33. Pipeline; 331. First pipeline; 332. Second pipeline; 34. Pump; 35. Regulating valve; 36. Check valve; 37. Box body; 4. Acquisition unit; 41. Data collector; 42. Transmission module; 421. Wireless transmission module; 422. Wired transmission module; 5. Oil inlet; 6. Oil outlet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The present invention will be further described in detail below with reference to the embodiments in the accompanying drawings.

[0027] As Figures 1 to 2 shown, it is the best embodiment of the present invention. The on-line monitoring system for oil fluid cleanliness includes a filter device 1 for filtering large-particle-size particles in the oil fluid and a connecting pipeline 2 arranged downstream of the filter device 1. The connecting pipeline 2 includes an oil extraction pipe 21 and an oil return pipe 22 arranged in parallel. It also includes a monitoring unit 3 and an acquisition unit 4 electrically connected to the monitoring unit 3. The monitoring unit 3 includes a cavity 31 for eliminating air bubbles in the oil fluid. The cavity 31 is internally provided with adjacent chambers on the left and right. One side of the cavity 31 is connected to the oil extraction pipe 21, and the other side of the cavity 31 is externally connected to two parallel pipelines 33. One pipeline 33 is used for discharging air bubbles, and the other pipeline 33 is used for discharging the oil fluid after eliminating air bubbles. The two pipelines 33 are merged and then connected to the oil return pipe 22. A sensor 32 for detecting the pollution degree of the oil fluid is provided on the pipeline 33.

[0028] Refer to Figure 2, the cavity 31 includes a first chamber 311 and a second chamber 312 which are spaced apart and communicate with each other at the top. A partition 313 is provided at the bottom of the first chamber 311 and the second chamber 312. Under the partitioning action of the partition 313, the entire cavity 31 is divided into the first chamber 311 and the second chamber 312 which communicate only at the top. In order to facilitate the separation of bubbles in the oil, ultrasonic separation is mostly used in the prior art. However, this method has high requirements for the viscosity and composition of the oil, and at the same time, the cost of ultrasonic equipment is also high. In this embodiment, a pump 34 which is highly adaptable to different oils and has a low cost is preferably used. One end of the pump 34 is connected to the oil intake pipe 21, and the other end is connected to one side of the first chamber 311 and can pressurize the first chamber 311. After the oil enters the first chamber 311 from the oil intake pipe 21, under the pressurizing action of the pump 34, the bubbles rise to the upper surface of the oil under the pressure and are discharged from the top, while the oil enters the second chamber 312 from the first chamber 311 through the gap above the partition 313 and is finally discharged from the second chamber 312.

[0029] To facilitate the separation of bubbles and oil, refer to Figure 2 , the pipeline 33 in this embodiment includes a first pipeline 331 and a second pipeline 332 which are arranged in parallel. The first pipeline 331 communicates with the tops of the first chamber 311 and the second chamber 312, and the second pipeline 332 communicates with the bottom of the second chamber 312. The bubbles continuously rise under the pressure and are discharged through the first pipeline 331 at the top of the cavity 31. The oil after bubble separation flows from the first chamber 311 into the second chamber 312. The inlet pipe of the second pipeline 332 is inserted into the bottom of the second chamber 312, so as to discharge the oil in the second chamber 312 along the second pipeline 332.

[0030] Since the fluid inside the first pipeline 331 is bubbles, while the fluid inside the second pipeline 332 is oil, there are differences in the internal flow rate and pressure of the two parallel pipelines 33. In order to avoid the occurrence of backflow phenomenon, refer to Figure 2 , regulating valves 35 for regulating the flow rate and check valves 36 for controlling the flow direction of the oil are provided on both the first pipeline 331 and the second pipeline 332 in this embodiment. Among them, the first pipeline 331 is used for exhausting bubbles and the flow rate will be relatively large, while the second pipeline 332 is used for discharging oil, and the flow rate of the oil needs to be adjusted accordingly according to the usage requirements. Therefore, regulating valves 35 for regulating the flow rate are installed on both the first pipeline 331 and the second pipeline 332; at the same time, check valves 36 for preventing backflow are respectively installed on the first pipeline 331 and the second pipeline 332, so as to ensure that the flow rates in the two pipelines 33 can converge to the oil outlet 6.

[0031] In addition, the monitoring unit 3 involves many components, such as the pump 34, the first pipeline 331, the second pipeline 332, the cavity 31, etc. To facilitate maintenance and management, the monitoring unit 3 includes a box body 37 for installing components. The setting of the box body 37 improves the integration of the monitoring unit 3 and can prevent the external environment from damaging the components. At the same time, referring to Figure 2 , oil inlets 5 and oil outlets 6 are arranged at intervals on the side wall of the box body 37. One side of the oil inlet 5 is connected to the oil extraction pipe 21, and the other side is connected to the pump 34. One side of the oil outlet 6 is connected to the outlet pipe, and the other side is connected to the pipeline merged by the first pipeline 331 and the second pipeline 332, which can facilitate the guiding of oil to enter and flow out of the monitoring unit 3.

[0032] Referring to Figure 1 , in order to timely feedback the data of the monitoring unit 3 to the user, the acquisition unit 4 includes a data collector 41 and a transmission module 42. The data collector 41 is used to collect the data of the monitoring unit 3. The transmission module 42 includes a wireless transmission module 421 for transmitting data to the mobile phone side and a wired transmission module 422 for transmitting data to the computer side. The wireless transmission module 421 and the wired transmission module 422 respectively transmit the data to the mobile phone side and the computer side, so as to facilitate the user to view the data and respond to equipment failures in a timely manner.

[0033] In addition, the filtering device 1 in this embodiment uses a filter tank. A filter element is arranged inside the filter tank, which can filter large particles in the oil. The capacity of the filter tank is large, which can be applied to large-flow oil. At the same time, the filter tank is also applicable to oils with different viscosities and compositions, and the cost is relatively low.

[0034] This embodiment takes a rolling mill as an example to elaborate on the working principle of the online monitoring system: After the oil passes through the filter tank, the large particles in the oil are filtered. The filtered oil enters the connecting pipeline 2. A oil extraction pipe 21 is arranged in the connecting pipeline 2, and the oil extraction pipe 21 is communicated with the oil inlet 5 on the box body 37. The oil enters the first chamber 311 through the oil inlet 5. Under the pressurization of the pump 34, the pressure of the oil in the first chamber 311 increases. The air bubbles in the oil rise continuously due to the pressure and finally flow out through the first pipeline 331 above the first chamber 311 and the second chamber 312. The oil after removing the air bubbles enters the second chamber 312 from the first chamber 311 and is finally discharged through the second pipeline 332. The air bubbles in the first pipeline 331 and the oil on the second pipeline 332 are finally collected and enter the connecting pipeline 2 through the return oil pipe 22. The sensor 32 on the second pipeline 332 can detect the cleanliness level of the oil on the bypass. The detected data is collected by the acquisition unit, and the wireless transmission module 421 and the wired transmission module 422 of the acquisition unit respectively transmit the data to the mobile phone side and the computer side, so as to facilitate the user to view the data and respond to equipment failures in a timely manner.

[0035] The fault judgment method of the oil cleanliness monitoring system in this embodiment is as follows:

[0036] For oil with a low cleanliness level (cleanliness level ≤ 12), the cleanliness of the oil can be detected by the sensor 32. The system can set the alarm value range according to the data of the oil cleanliness level, and after being collected by the collection unit 4, the alarm data is transmitted to the computer terminal or the mobile phone terminal in real time, so as to analyze and process the fault in time;

[0037] For oil with a high cleanliness level (cleanliness level > 12), the sensor 32 cannot grade and determine the cleanliness of the oil, and it still shows as level 12. Therefore, it is necessary to record the particulate matter data through a data algorithm. When the cleanliness level of the oil exceeds level 12, the number of particulate matters of 5 - 15 μm in the oil is greater than 1,024,000. The system can set multiple groups of alarm values. When the particulate matter exceeds the alarm value and triggers an alarm, the mobile phone terminal or the computer terminal receives the alarm information and processes the abnormal state of the equipment in time.

[0038] When the online monitoring system is in an alarm state, the user should first check whether the system is abnormal and causes misjudgment. Secondly, it is necessary to check the filtering device 1. If it is caused by the filter element in the filtering device 1 falling off, it should be reinstalled. If the filtering ability decreases due to the service life of the filter element, the filter element should be replaced in time.

Claims

1. An on-line oil cleanliness monitoring system, comprising: A filtering device (1) for filtering large-particle-size particles in the oil; A connecting pipeline (2) arranged downstream of the filtering device (1), including an oil extraction pipe (21) and an oil return pipe (22) arranged in parallel; It is characterized in that: It further comprises: A monitoring unit (3), including a cavity (31) for eliminating air bubbles in the oil. At least two chambers are arranged in the cavity (31). One side of the cavity (31) is connected to the oil extraction pipe (21), and at least two parallel pipes (33) are externally connected to the other side of the cavity (31). The downstream of the pipe (33) is connected to the oil return pipe (22), and a sensor (32) for detecting the oil pollution degree is arranged on the pipe (33); An acquisition unit (4), electrically connected to the monitoring unit (3), capable of collecting the data acquired by the monitoring unit (3) and transmitting it to a terminal device.

2. The on-line oil cleanliness monitoring system according to claim 1, characterized in that: The cavity (31) includes a first chamber (311) and a second chamber (312) arranged at intervals and connected at the top. A partition (313) is arranged at the bottom of the first chamber (311) and the second chamber (312).

3. The on-line oil cleanliness monitoring system according to claim 2, wherein: The pipe (33) includes a first pipe (331) and a second pipe (332) arranged in parallel. The first pipe (331) is connected to the tops of the first chamber (311) and the second chamber (312), and the second pipe (332) is connected to the bottom of the second chamber (312).

4. The on-line oil cleanliness monitoring system according to claim 3, characterized in that: Regulating valves (35) for regulating the flow rate and check valves (36) for controlling the flow direction of the oil are arranged on both the first pipe (331) and the second pipe (332).

5. The on-line oil cleanliness monitoring system according to claim 4, characterized in that: The monitoring unit (3) further includes a pump (34). One end of the pump (34) is connected to the oil extraction pipe (21), and the other end is connected to one side of the first chamber (311).

6. The on-line oil cleanliness monitoring system according to claim 5, characterized in that: The monitoring unit (3) includes a box body (37) for installing components. An oil inlet (5) and an oil outlet (6) are arranged at intervals on the side wall of the box body (37). One side of the oil inlet (5) is connected to the oil extraction pipe (21), and the other side is connected to the pump (34). One side of the oil outlet (6) is connected to the oil return pipe (22), and the other side is connected to the pipeline after the first pipe (331) and the second pipe (332) are combined.

7. The on-line oil cleanliness monitoring system according to claim 1, wherein: The acquisition unit (4) includes a data collector (41) and a transmission module (42). The data collector (41) is used to collect the data of the monitoring unit (3), and the transmission module (42) includes a wireless transmission module (421) for transmitting data to the mobile phone side and a wired transmission module (422) for transmitting data to the computer side.

8. The on-line oil cleanliness monitoring system according to claim 1, characterized in that: The filtering device (1) is a filtering tank.

9. A fault judgment method for the on-line oil cleanliness monitoring system according to any one of claims 1 to 8, characterized in that: For low-cleanliness-level oil (cleanliness level ≤ 12), the cleanliness of the oil can be detected by the sensor (32). The system can set the alarm value range according to the data of the oil cleanliness level, and after being collected by the acquisition unit (4), the alarm data is transmitted to the computer terminal or the mobile phone terminal in real time, so as to analyze and process the fault in time; For high-cleanliness-level oil (cleanliness level > 12), the particulate matter data is recorded through a data algorithm. The system sets multiple groups of alarm values. When the particulate matter exceeds the alarm value and triggers an alarm, the mobile phone terminal or the computer terminal receives the alarm information and processes the abnormal state of the equipment in time.

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