A chip-proof type lubricating oil level sensor and gear box

Abstract

This application relates to the field of liquid level monitoring technology, and more particularly to a chip-resistant lubricating oil level sensor and gearbox. It includes a sensor probe with a flow-guiding sheath fitted around its outer side. The rear end of the flow-guiding sheath is detachably connected to the sensor probe via a connecting structure. The diameter of the flow-guiding sheath gradually decreases from its rear end to its middle section, and gradually increases from its middle section to its front end. A medium inlet is provided in the middle section, and a medium outlet and a flow guide groove are respectively provided at the front and rear ends to create a low-pressure zone in the middle section of the flow-guiding sheath. This application, by using a venturi tube structure with a medium inlet featuring a precision grid in its middle section, effectively prevents large metal particles from entering the sensor probe area. Simultaneously, a detachable magnetic adsorption component upstream of the flow-guiding sheath within the gearbox forms a dual chip-resistant structure of magnetic pretreatment and grid interception, ensuring measurement stability.

Description

Technical Field

[0001] This application relates to the technical field of liquid level monitoring, and in particular to a chip-resistant lubricating oil level sensor and gearbox. Background Technology

[0002] The lubricating oil level sensor is the core sensing device for detecting the level of lubricating oil in equipment. It is widely used in various mechanical equipment that require lubrication, such as engines, gearboxes, hydraulic systems, and ships. Its core function is to monitor the remaining amount of lubricating oil in real time, prevent equipment wear, overheating, or even scrapping due to insufficient oil, and at the same time assist in realizing automated control functions such as level alarm and automatic oil replenishment.

[0003] In related technologies, a large amount of metal shavings are generated during gear meshing and bearing rotation inside the gearbox. These metal shavings circulate with the lubricating oil and easily adhere to the surface of the sensor probe, blocking the measurement channel. This not only interferes with the heat conduction efficiency of the temperature sensing element, leading to a decrease in the accuracy of liquid level measurement, but may also cause wear on sensor components, shortening their service life. In addition, the lack of a flow guiding structure makes it easy for the lubricating oil to stagnate or eddy in the measurement area, resulting in a slow sensor response speed and an inability to reflect dynamic changes in liquid level. Utility Model Content

[0004] To improve the measurement accuracy of liquid level sensors, this application provides a chip-resistant lubricating oil level sensor and gearbox.

[0005] On the one hand, this application provides a chip-resistant lubricating oil level sensor, which adopts the following technical solution:

[0006] A chip-resistant lubricating oil level sensor includes a sensor probe with a flow-guiding sheath fitted on its outer side. The rear end of the flow-guiding sheath is detachably connected to the sensor probe via a connecting structure. The diameter of the flow-guiding sheath gradually decreases from its rear end to its middle section and gradually increases from its middle section to its front end. A medium inlet is provided in the middle section, and a medium outlet and a flow-guiding groove are provided at the front and rear ends, respectively, to create a low-pressure zone in the middle section of the flow-guiding sheath, thereby continuously drawing the medium in from the medium inlet and discharging it from the medium outlet and the flow-guiding groove.

[0007] Optionally, the sensor probe end is provided with a sheath, and the connection structure includes a flange, a connecting rod, and a locking element. The flange is integrally formed with the rear end of the flow guide sheath. The connecting rod is located on the side of the sensor body facing the sheath. A through hole is provided on the sheath, which corresponds to the flange hole on the flange. The connecting rod passes through the through hole and the flange hole one by one. The locking element cooperates with the end of the connecting rod that passes through the flange hole to achieve locking.

[0008] Optionally, the sheath has a stepped groove on the side facing the flow guide sheath, and the flange end face has a positioning shoulder. The stepped groove and the positioning shoulder cooperate with each other to enable the flow guide sheath to be coaxially positioned with the sheath. A sealing ring is also provided between the flange and the sheath.

[0009] Optionally, the flow-guiding sheath has a Venturi tube structure, including a constriction section, a throat section, and a diffuser section. The front end and rear end of the flow-guiding sheath are respectively the end of the diffuser section away from the throat section and the end of the constriction section away from the throat section.

[0010] Optionally, multiple medium inlets are evenly provided in the axial direction of the middle section of the flow guide sheath. The long side of the medium inlet is parallel to the axis of the flow guide sheath. A precision grid is installed on the inner side of each medium inlet to block large metal particles from entering, while not affecting the flow of medium and heat conduction.

[0011] Optionally, the sensor probe is a resistance temperature detector probe, consisting of a temperature sensing element and a protective shell, wherein the temperature sensing element is encapsulated within the protective shell.

[0012] On the other hand, this application also provides a gearbox, which adopts the following technical solution:

[0013] A gearbox includes a chip-resistant lubricating oil level sensor as described above. The side wall of the gearbox has a mounting hole, and the sensor probe extends horizontally through the mounting hole into the gearbox. The sensor probe is connected to the side wall of the gearbox by a locking nut.

[0014] Optionally, the gearbox is provided with a detachable magnetic adsorption component, which is correspondingly located upstream of the flow guide sheath.

[0015] Optionally, the probe sensor is installed in a relatively stable weak flow area inside the gearbox, and the medium inlet of the guide sheath is not directly opposite the lubricating oil nozzle inside the gearbox or the direction of the main oil flow splashed by gear meshing.

[0016] Optionally, the sensing portion of the sensor probe is positioned below the lowest safe liquid level in the gearbox to ensure full-range measurement.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] 1. By setting up a flow guide sheath and adopting a venturi tube structure, a medium inlet with a precision grid is set in the middle section, which can effectively block large metal particles from entering the sensor probe area. At the same time, in conjunction with the detachable magnetic adsorption component upstream of the flow guide sheath in the gearbox, a dual anti-chip structure of magnetic pretreatment and grid interception is formed, which greatly reduces the wear of metal particles on the temperature sensing element and the blockage of the measurement channel, ensuring measurement stability.

[0019] 2. By setting a medium outlet and a flow guide groove at the front and rear ends of the flow guide sheath respectively, lubricating oil is drawn in from the medium inlet and discharged from the medium outlet and the flow guide groove, forming a continuous circulating oil flow, avoiding measurement lag caused by oil stagnation; at the same time, the sensor is installed in the relatively stable weak flow area inside the gearbox, and the medium inlet of the flow guide sheath is not directly facing the lubricating oil nozzle and the main oil flow direction, effectively avoiding data fluctuations caused by oil flow impact; in addition, the sensing part of the sensor probe is set below the minimum safe liquid level to achieve full-range measurement and ensure timely feedback when the liquid level is abnormal. Attached Figure Description

[0020] Figure 1 This is a front view structural schematic diagram of the anti-chip lubricating oil level sensor according to an embodiment of this application.

[0021] Figure 2 This is a front view cross-sectional structural diagram of the anti-chip lubricating oil level sensor according to an embodiment of this application.

[0022] Figure 3 This is a front cross-sectional structural diagram of the gearbox according to an embodiment of this application.

[0023] Figure 4 This is an embodiment of the present application. Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0024] Reference numerals: 1. Sensor probe; 11. Temperature sensing element; 12. Protective shell; 2. Flow guide sheath; 21. Constriction section; 22. Throat; 23. Diffusion section; 24. Medium inlet; 25. Medium outlet; 26. Flow guide groove; 27. Precision grid; 3. Connecting structure; 31. Flange; 311. Positioning shoulder; 32. Connecting rod; 33. Locking element; 4. Sheath; 5. Sealing ring; 6. Gearbox; 7. Magnetic adsorption element. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0026] This application discloses a chip-resistant lubricating oil level sensor. (Refer to...) Figure 1 The chip-proof lubricating oil level sensor includes a sensor probe 1, which adopts a resistance temperature detector (RTD) probe structure and consists of a temperature sensing element 11 and a protective shell 12. The temperature sensing element 11 is a PT100 platinum RTD with a measurement accuracy of ±0.1℃, which is encapsulated in a stainless steel protective shell 12 to ensure heat conduction efficiency. It also has good wear resistance and corrosion resistance, and can be adapted to high temperature and vibration conditions in gearboxes.

[0027] A flow guide sheath 2 is fitted on the outside of the sensor probe 1. The flow guide sheath 2 is made of stainless steel and has a venturi tube structure. Specifically, it includes a constriction section 21, a throat section 22, and a diffuser section 23, which are integrally formed in sequence. The throat section 22 is the middle section of the flow guide sheath 2. The end of the constriction section 21 away from the throat section 22 is the rear end of the flow guide sheath 2. The end of the diffuser section 23 away from the throat section 22 is the front end of the flow guide sheath 2. The diameter of the constriction section 21 gradually decreases from the rear end to the throat section 22, and the diameter of the diffuser section 23 gradually increases from the throat section 22 to the front end, so as to form a stable low-pressure area in the middle section of the flow guide sheath 2.

[0028] Multiple rectangular medium inlets 24 are evenly provided along the axial direction of the throat 22, with their long sides parallel to the axis of the guide sheath 2. A precision grid 27 is welded and fixed to the inner side of each medium inlet 24. The mesh size is preferably 80-120 and the mesh size is 0.12-0.18mm, so as to effectively block large metal shavings with a particle size greater than 0.2mm, while ensuring that the lubricating oil has a small flow resistance and does not affect the heat transfer efficiency.

[0029] The front end of the flow guide sheath 2 is evenly provided with multiple medium outlets 25, and the rear end is provided with two symmetrically distributed flow guide grooves 26 along the axial direction to ensure that the oil flow is quickly discharged and forms a circulation.

[0030] Reference Figure 2 A stainless steel sheath 4 is welded and fixed to the end of the sensor probe 1. A connecting structure 3 is provided between the sheath 4 and the flow guide sheath 2. The connecting structure 3 includes a flange 31 formed at the rear end of the flow guide sheath 2, a connecting rod 32 formed on the sensor probe 1, and a locking member 33 connecting the flange 31 and the sensor probe 1. A stepped groove is provided on the side of the sheath 4 facing the flow guide sheath 2. A positioning shoulder 311 that mates with the stepped groove is machined on the end face of the flange 31 to achieve coaxial positioning of the flow guide sheath 2 and the sheath 4. Four flange holes are evenly distributed on the flange 31, and four through holes are correspondingly distributed on the sheath 4. The connecting rod 32 is made of stainless steel bolts. One end of the connecting rod 32 is welded and fixed to the side of the sensor body facing the sheath 4, and the other end passes through the through holes and flange holes in sequence, and is locked and fixed by the locking member 33, so that the flow guide sheath 2 and the sensor probe 1 are detachably connected. An O-ring 5 is also provided between the flange 31 and the sheath 4. The sealing ring 5 is embedded in the annular groove of the stepped groove to ensure the sealing of the connection and prevent lubricating oil leakage. Preferably, the locking member 33 is a fastening screw.

[0031] This application also discloses a gearbox including the aforementioned anti-chip lubricating oil level sensor. (Refer to...) Figure 3 and Figure 4The side wall of the gearbox 6 is machined with mounting holes. The sensor probe 1 extends horizontally through the mounting holes into the inside of the gearbox 6. Its sensing part is set below the lowest safe liquid level of the gearbox 6 to ensure full-range liquid level measurement coverage.

[0032] The sensor probe 1 is connected and fixed to the side wall of the gearbox 6 by a matching locking nut. Inside the gearbox 6, upstream of the flow guide sheath 2 (at the front end of the oil flow direction), there is a detachable magnetic adsorption component 7. The magnetic adsorption component 7 is a cylindrical permanent magnet, which is fixed to the inner wall of the gearbox 6 by a bracket. Its axis is parallel to the axis of the flow guide sheath 2. It is used to adsorb most of the metal shavings in the lubricating oil in advance, forming a dual anti-shaving structure consisting of magnetic pretreatment and grid interception.

[0033] The sensor probe 1 is installed in a weak flow area with low oil flow velocity inside the gearbox 6. The medium inlet 24 (oil inlet window) of the guide sheath 2 is not directly opposite the lubricating oil nozzle and the main oil flow direction splashed by gear meshing inside the gearbox 6 to avoid oil flow impact causing fluctuations in measurement data and ensure measurement stability.

[0034] During operation, the lubricating oil in gearbox 6 circulates with the equipment. When it flows through the magnetic adsorption component 7, most of the metal shavings are adsorbed and trapped. The remaining small amount of fine metal shavings flow with the lubricating oil to the guide sheath 2. Due to the venturi tube structure of the guide sheath 2, the oil flow velocity increases when it passes through the contraction section 21, forming a low-pressure zone at the throat 22. This actively draws the lubricating oil from the medium inlet 24. After the remaining metal shavings are intercepted by the precision grid 27, the oil flows over the surface of the sensor probe 1 and is then discharged from the medium outlet 25 and the guide groove 26, forming a continuously circulating oil flow. The temperature sensing element 11 accurately reflects the liquid level by sensing the difference in thermal conductivity between the lubricating oil and air. During maintenance, if it is necessary to clean metal shavings or inspect the sensor, simply loosen the locking piece 33 to remove the flow guide sheath 2 from the sensor probe 1 and clean the metal shavings trapped on the surface of the precision grid 27. Simultaneously, the magnetic adsorption piece 7 can be removed to clean the metal shavings adsorbed on its surface. After maintenance, the parts can be reversed and reassembled. The operation is convenient, requiring no disassembly of the entire sensor assembly and not affecting normal equipment operation and maintenance. This embodiment of the chip-resistant lubricating oil level sensor and gearbox achieves multiple advantages through a reasonable structural design, including chip resistance, accurate measurement, and convenient maintenance. It can be widely used in gearbox equipment in wind power, industrial transmission, and other fields, ensuring long-term safe and stable operation of the equipment.

[0035] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A chip-resistant lubricating oil level sensor, characterized in that, The device includes a sensor probe, which is fitted with a flow guide sheath. The rear end of the flow guide sheath is detachably connected to the sensor probe via a connecting structure. The diameter of the flow guide sheath gradually decreases from the rear end to the middle section and gradually increases from the middle section to the front end. A medium inlet is provided in the middle section, and a medium outlet and a flow guide groove are provided at the front end and rear end, respectively, to create a low-pressure zone in the middle section of the flow guide sheath, thereby driving the medium to be continuously drawn in from the medium inlet and discharged from the medium outlet and the flow guide groove. The flow-guiding sheath has a Venturi tube structure, including a constriction section, a throat, and a diffuser section. The front end and rear end of the flow-guiding sheath are respectively the end of the diffuser section away from the throat and the end of the constriction section away from the throat. The middle section of the flow guide sheath has multiple media inlets evenly distributed along its axial direction. The long side of each media inlet is parallel to the axis of the flow guide sheath. Each media inlet is fitted with a precision grid on its inner side to prevent large metal particles from entering, while not affecting media flow and heat conduction.

2. The anti-chip lubricating oil level sensor according to claim 1, characterized in that: The sensor probe is provided with a sheath at its end. The connection structure includes a flange, a connecting rod, and a locking element. The flange is integrally formed at the rear end of the flow guide sheath. The connecting rod is located on the side of the sensor body facing the sheath. A through hole is provided on the sheath, which corresponds to the flange hole on the flange. The connecting rod passes through the through hole and the flange hole one by one. The locking element cooperates with the end of the connecting rod that passes through the flange hole to achieve locking.

3. The anti-chip lubricating oil level sensor according to claim 2, characterized in that: The sheath has a stepped groove on the side facing the flow guide sheath, and the flange end face has a positioning shoulder. The stepped groove and the positioning shoulder cooperate with each other to enable the flow guide sheath to be coaxially positioned with the sheath. A sealing ring is also provided between the flange and the sheath.

4. The anti-chip lubricating oil level sensor according to claim 1, characterized in that: The sensor probe is a resistance temperature detector probe, which consists of a temperature sensing element and a protective shell, with the temperature sensing element encapsulated inside the protective shell.

5. A gearbox comprising the anti-chip lubricating oil level sensor according to any one of claims 1-4, characterized in that: The gearbox has a mounting hole on its side wall. The sensor probe extends horizontally through the mounting hole into the gearbox and is connected to the gearbox side wall by a lock nut.

6. The gearbox according to claim 5, characterized in that: The gearbox is equipped with a detachable magnetic adsorption component, which is located upstream of the flow guide sheath.

7. The gearbox according to claim 5, characterized in that: The probe sensor is installed in a relatively stable, weak flow area within the gearbox, and the medium inlet of the guide sheath is not directly opposite the lubricating oil nozzle inside the gearbox or the direction of the main oil flow splashed during gear meshing.

8. The gearbox according to claim 5, characterized in that: The sensing part of the sensor probe is positioned below the lowest safe liquid level in the gearbox to ensure full-range measurement.

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