External hydraulic oil level sensor of fan

Abstract

The utility model relates to the technical field of liquid level measurement, in particular to an external hydraulic oil level sensor for a fan, which comprises a window oil level gauge, a non-contact capacitive liquid level sensor, a mounting component, a PLC (programmable logic controller) and a wireless communication module. The PLC is electrically connected with the hydraulic system and the non-contact capacitive liquid level sensor, and the PLC is in communication connection with the wireless communication module; the window oil level indicator is installed on the outer side of the oil tank and comprises a shell and an oil level indicating pipe, an installation groove is formed in the front side of the shell, the oil level indicating pipe is arranged in the installation groove, an upper communicating pipe and a lower communicating pipe are arranged at the upper end and the lower end of the oil level indicating pipe respectively, and the upper communicating pipe and the lower communicating pipe penetrate through the shell to be communicated with the oil tank and the oil level indicating pipe. The non-contact capacitive liquid level sensor is installed on the outer side of the window oil level gauge through the installation assembly. The oil leakage monitoring device can timely monitor whether the hydraulic system of the offshore wind driven generator leaks oil or not, and effectively reduces loss of materials such as hydraulic oil and labor cost.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level measurement, in particular to an external fan hydraulic oil level sensor. Background Art

[0002] A hydraulic system refers to a control mechanical unit that uses a hydraulic fluid as a medium to achieve power transmission and motion control. The hydraulic system has the advantages of stable transmission, large power density, easy realization of five-level speed change, easy replacement of components, and reliable overload protection, and is widely used in large wind turbines.

[0003] Due to pressure, clearance or other various reasons, the existing hydraulic system may have leakage of oil. When there is oil leakage, it will cause the pressure of the hydraulic system to drop, affect the working performance of the hydraulic system, damage the hydraulic components, and waste resources. Therefore, the leakage of hydraulic oil is a problem that cannot be ignored.

[0004] However, it is difficult to detect the oil leakage of each component of the hydraulic system of an offshore wind turbine in a timely manner. Since the offshore wind turbine is usually unattended, the main control system can only alarm and stop when the hydraulic oil is almost exhausted, or the oil leakage is found during the inspection by the staff, resulting in material loss of hydraulic oil and power generation loss of the generator set. Therefore, there is an urgent need for a device that can detect the oil leakage of the hydraulic system in a timely manner. Summary of the Utility Model

[0005] Therefore, in view of the above problems, the utility model provides an external fan hydraulic oil level sensor to solve the problem that it is difficult to detect the oil leakage of the hydraulic system of an offshore wind turbine in the prior art in a timely manner.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] An external fan hydraulic oil level sensor is arranged on the oil tank of the hydraulic system and includes a window oil level gauge, a non-contact capacitive liquid level sensor, a mounting component, a PLC controller and a wireless communication module. The PLC controller is electrically connected to the hydraulic system and the non-contact capacitive liquid level sensor respectively, and the PLC controller is communicatively connected to the wireless communication module.

[0008] The window oil level gauge is installed outside the oil tank. The window oil level gauge includes a housing and an oil level indicating tube. A vertical mounting groove is formed on the front side of the housing, and the oil level indicating tube is arranged in the mounting groove. The upper and lower ends of the oil level indicating tube are respectively provided with an upper communicating tube and a lower communicating tube, and both the upper communicating tube and the lower communicating tube penetrate through the housing to communicate the oil tank and the oil level indicating tube.

[0009] The non-contact capacitive liquid level sensor is installed outside the window oil level gauge through the installation component.

[0010] Further, the wireless communication module selects a LoRa wireless communication module.

[0011] Further, the outer shell selects an insulating material, and the oil level indicating tube selects a transparent insulating material.

[0012] Further, water level scales are provided on the oil level indicating tube.

[0013] Further, the installation component includes an installation frame, and fixing mechanisms are respectively arranged at the upper and lower ends of the installation frame; a moving through groove is formed in the middle of the installation frame, and a guide rod and a lead screw are arranged in the moving through groove. Both the upper and lower ends of the guide rod are fixedly connected to the installation frame, and both the upper and lower ends of the lead screw are rotatably connected to the lead screw, and the upper end of the lead screw penetrates through the installation frame and is fixedly connected with a first rotating handle; a first moving block is slidably connected to the guide rod, a second moving block is threadedly connected to the lead screw, and one sides of the first moving block and the second moving block close to the window oil level gauge are both fixedly connected to the non-contact capacitive liquid level sensor.

[0014] Further, the fixing mechanism includes an adjustment groove, the adjustment groove is arranged on one side of the installation frame close to the window oil level gauge, a bidirectional lead screw is rotatably connected in the adjustment groove, two clamping blocks are symmetrically arranged on the bidirectional lead screw, and both clamping blocks are threadedly connected to the bidirectional lead screw; one end of the bidirectional lead screw penetrates through the installation frame and is fixedly connected with a second rotating handle.

[0015] By adopting the foregoing technical solutions, the beneficial effects of the present utility model are as follows:

[0016] 1. By arranging an external window oil level gauge in the present utility model, the oil level in the oil level indicating tube is kept consistent with the oil level in the fuel tank, which is convenient for directly observing the oil level in the fuel tank with the naked eye and avoids interference caused by the opaque metal shell of the fuel tank to the observation and measurement of the oil level.

[0017] 2. By arranging a non-contact capacitive liquid level sensor, the oil level state can be monitored outside the oil level indicating tube, and then the oil level in the fuel tank can be indirectly monitored, avoiding contamination of the liquid in the fuel tank; when the oil level in the oil level indicating tube drops to the monitoring position of the non-contact capacitive liquid level sensor, it indicates that there is oil leakage or seepage in the fuel tank. The non-contact capacitive liquid level sensor transmits the signal to the PLC controller, and the PLC controller controls the hydraulic system to stop working, and at the same time controls the wireless communication module to send an alarm signal to the monitoring background, reminding the staff to repair the hydraulic system in time, effectively reducing the loss of materials such as hydraulic oil and labor costs, and at the same time reducing the loss of electric energy of the generator set.

[0018] 3. By setting up the installation component, it is convenient to fix the non-contact capacitive liquid level sensor on the window oil level gauge, and the height of the non-contact capacitive liquid level sensor can be adjusted according to requirements. Brief Description of the Drawings

[0019] Figure 1 is the front view structural schematic diagram of the present utility model;

[0020] Figure 2 is the side view structural sectional view of the present utility model;

[0021] Figure 3 is the structural schematic diagram of the installation component;

[0022] Figure 4 is the circuit connection schematic diagram of the present utility model. Detailed Embodiment

[0023] The present utility model will be further described below in conjunction with the drawings and specific embodiments.

[0024] Refer to Figures 1 to 4 , this embodiment provides an external fan hydraulic oil level sensor, which is arranged on the fuel tank 2 of the hydraulic system 1, and includes a window oil level gauge 3, a non-contact capacitive liquid level sensor 4, an installation component, a PLC controller 6 and a wireless communication module 7. The PLC controller 6 is electrically connected to the hydraulic system 1 and the non-contact capacitive liquid level sensor 4 respectively, and the PLC controller 6 is communicatively connected to the wireless communication module 7. In this specific embodiment, preferably, the wireless communication module 7 is a LoRa wireless communication module. Since the offshore wind turbines are usually far away and there is no base station, the communication distance of the LoRa wireless communication module reaches more than 15 km, which can realize the signal transmission between the offshore wind turbines and the monitoring background.

[0025] The window oil level gauge 3 is installed on the outside of the fuel tank 2. The window oil level gauge 3 includes a housing 31 and an oil level indicating tube 32. A water level scale 33 is arranged on the oil level indicating tube 32. The housing 31 is made of insulating material, and the oil level indicating tube 32 is made of transparent insulating material to avoid interfering with the measurement of the non-contact capacitive liquid level sensor 4. A vertical installation groove 34 is opened on the front side of the housing 31. The oil level indicating tube 32 is arranged in the installation groove 34. An upper communication pipe 35 and a lower communication pipe 36 are respectively arranged at the upper and lower ends of the oil level indicating tube 32. The upper communication pipe 35 and the lower communication pipe 36 both penetrate the housing 31 to communicate the fuel tank 2 and the oil level indicating tube 32. By setting up the external window oil level gauge 3, the oil level in the oil level indicating tube 32 is kept consistent with the oil level in the fuel tank 2, which is convenient for directly observing the oil level in the fuel tank 2 with the naked eye and avoiding the interference of the opaque housing of the fuel tank 2 on the observation and measurement of the oil level.

[0026] The non-contact capacitive liquid level sensor 4 is installed outside the window type oil level gauge 3 through the installation component. The non-contact capacitive liquid level sensor 4 monitors the oil level state in the oil level indicating pipe 32, and thus indirectly monitors the oil level in the fuel tank 2. When the oil level in the oil level indicating pipe 32 drops to the monitoring position of the non-contact capacitive liquid level sensor 4, it indicates that there is oil leakage in the fuel tank 2. The non-contact capacitive liquid level sensor 4 transmits a signal to the PLC controller 6. The PLC controller 6 controls the hydraulic system 1 to stop working, and at the same time controls the wireless communication module 7 to send an alarm signal to the monitoring background to remind the staff to repair the hydraulic system 1 in time.

[0027] The above-mentioned non-contact capacitive liquid level sensor 4, PLC controller 6, hydraulic system 1 and wireless communication module 7 are all existing devices, which will not be elaborated here.

[0028] The installation component includes an installation frame 51, and fixing mechanisms are respectively arranged at the upper and lower ends of the installation frame 51; a moving through groove 52 is formed in the middle of the installation frame 51, and a guide rod 53 and a lead screw 54 are arranged in the moving through groove 52. Both the upper and lower ends of the guide rod 53 are fixedly connected to the installation frame 51, and both the upper and lower ends of the lead screw 54 are rotatably connected to the lead screw 54, and the upper end of the lead screw 54 penetrates through the installation frame 51 and is fixedly connected with a first rotating handle 55; a first moving block 41 is slidably connected to the guide rod 53, and a second moving block 42 is threadedly connected to the lead screw 54. The sides of the first moving block 41 and the second moving block 42 close to the window type oil level gauge 3 are both fixedly connected to the non-contact capacitive liquid level sensor 4. By rotating the first rotating handle 55, the first rotating handle 55 drives the lead screw 54 to rotate, and the rotation of the lead screw 54 drives the second moving block 42 to move on the lead screw 54, so as to adjust the position of the non-contact capacitive liquid level sensor 4 up and down; the guide rod 53 plays a role in limiting, preventing the non-contact capacitive liquid level sensor 4 from rotating, so that the non-contact capacitive liquid level sensor 4 can only move up and down in the moving through groove 52.

[0029] The fixing mechanism includes an adjusting groove 56, which is arranged on the side of the installation frame 51 close to the window type oil level gauge 3. A bidirectional lead screw 57 is rotatably connected in the adjusting groove 56, and two clamping blocks 58 are symmetrically arranged on the bidirectional lead screw 57. Both of the two clamping blocks 58 are threadedly connected to the bidirectional lead screw 57; one end of the bidirectional lead screw 57 penetrates through the installation frame 51 and is fixedly connected with a second rotating handle 59. By rotating the second rotating handle 59, the second rotating handle 59 can drive the bidirectional lead screw 57 to rotate, and the rotation of the bidirectional lead screw 57 drives the two clamping blocks 58 to move towards each other to clamp the outer shell 31 of the window type oil level gauge 3, thereby fixing the non-contact capacitive liquid level sensor 4 on the window type oil level gauge 3.

[0030] The working principle of the present utility model is as follows:

[0031] First, install the non-contact capacitive liquid level sensor 4 on the window oil level gauge 3. By adjusting the second rotary grip 59, make the two clamping blocks 58 move towards each other to clamp the outer shell 31 of the window oil level gauge 3, thereby fixing the non-contact capacitive liquid level sensor 4 on the window oil level gauge 3. By rotating the first rotary grip 55, the non-contact capacitive liquid level sensor 4 can be finely adjusted up and down to make the non-contact capacitive liquid level sensor 4 at a predetermined monitoring point. When there is oil leakage or seepage in the hydraulic system 1, the oil level of the window oil level gauge 3 begins to drop. Once it drops to the measurement position of the non-contact capacitive liquid level sensor 4, the non-contact capacitive liquid level sensor 4 transmits a signal to the PLC controller 6. The PLC controller 6 controls the hydraulic system 1 to stop working to avoid further losses, and at the same time controls the wireless communication module 7 to send an alarm signal to the monitoring background to remind the staff to deal with the abnormal situation of the hydraulic system 1 in time to ensure the safe operation of the equipment.

[0032] Although the present invention has been specifically shown and described in combination with the preferred embodiments, those skilled in the art should understand that various changes can be made to the present invention in form and detail without departing from the spirit and scope of the present invention defined by the appended claims, and all of them are within the protection scope of the present invention.

Claims

1. A fan external hydraulic oil level sensor, arranged on the oil tank of the hydraulic system, characterized in that: It includes a window oil level gauge, a non-contact capacitive liquid level sensor, a mounting assembly, a PLC controller and a wireless communication module; the PLC controller is electrically connected to the hydraulic system and the non-contact capacitive liquid level sensor respectively, and the PLC controller is in communication connection with the wireless communication module; The window oil level gauge is installed on the outside of the oil tank. The window oil level gauge includes a shell and an oil level indicator tube. A vertical installation groove is provided on the front side of the shell. The oil level indicator tube is arranged in the installation groove. An upper connecting tube and a lower connecting tube are respectively provided at the upper and lower ends of the oil level indicator tube. The upper connecting tube and the lower connecting tube both penetrate the shell to connect the oil tank and the oil level indicator tube. The non-contact capacitive liquid level sensor is installed on the outside of the window oil level gauge through the installation assembly.

2. The fan external hydraulic oil level sensor according to claim 1, characterized in that: The wireless communication module is a LoRa wireless communication module.

3. The external hydraulic oil level sensor for a fan according to claim 1, characterized in that: The shell is made of insulating material, and the oil level indicator tube is made of transparent insulating material.

4. The external hydraulic oil level sensor for a fan according to claim 1, characterized in that: The oil level indicating tube is provided with a water level scale.

5. The external hydraulic oil level sensor for a fan according to claim 1, characterized in that: The mounting assembly includes a mounting frame, and fixing mechanisms are respectively arranged at the upper and lower ends of the mounting frame; a movable through groove is opened in the middle of the mounting frame, and a guide rod and a screw rod are arranged in the movable through groove, the upper and lower ends of the guide rod are fixedly connected to the mounting frame, the upper and lower ends of the screw rod are rotatably connected to the screw rod, and the upper end of the screw rod passes through the mounting frame and is fixedly connected to a first rotating handle; a first movable block is slidably connected to the guide rod, and a second movable block is threadedly connected to the screw rod, and the first movable block and the second movable block are fixedly connected to the non-contact capacitive liquid level sensor on one side close to the window oil level gauge.

6. The external hydraulic oil level sensor for a fan according to claim 5, characterized in that: The fixing mechanism includes an adjustment groove, which is arranged on a side of the mounting frame close to the window oil level gauge. A bidirectional screw is rotatably connected in the adjustment groove, and two clamping blocks are symmetrically arranged on the bidirectional screw. The two clamping blocks are both threadedly connected to the bidirectional screw. One end of the bidirectional screw passes through the mounting frame and is fixedly connected to a second rotating handle.

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