A liquid level detection device for an oil depot sump

Abstract

The utility model relates to an oil depot sewage well's liquid level detection device, including connecting rod float ball liquid level meter, the connecting rod outside coaxial sleeve of connecting rod float ball liquid level meter is provided with the casing, and the upper end of casing is fixedly connected in the upper flange of connecting rod float ball liquid level meter, and the lower end of casing is closed and forms the blind end, the lower end lateral wall of casing is provided with at least one row of liquid inlet hole, and the annular groove that surrounds casing outer wall is equipped with above liquid inlet hole, the annular air cavity is inlayed in the annular groove, and the lower surface of this annular air cavity is evenly provided with the inclined gas outlet, the upper portion of annular air cavity is equipped with the gas inlet connector that penetrates casing wall, the gas inlet connector is connected external high pressure gas source through high pressure inlet pipe. External high pressure gas source provides the access point, so that can conveniently pass through high pressure inlet pipe and pass into high pressure gas to annular air cavity, realizes the purging to casing outer wall liquid inlet hole area, and the device provides the continuous stable operating environment for the medium plate production process.

Description

Technical Field

[0001] This utility model belongs to the field of liquid level detection technology, and in particular relates to a liquid level detection device for an oil depot sewage well. Background Technology

[0002] In medium-thick plate rolling production lines with a diameter of 3500mm and above, the hydraulic lubrication system, as the core power unit, is generally laid out underground. The main structure of the oil depot is typically located in a closed space 7 meters below the surface. A collection ditch is arranged around the bottom of the oil depot to collect oily wastewater generated during routine equipment maintenance, leaking waste oil from the lubrication system, and liquids intruded into the environment. These pollutants are then collected by gravity into a supporting drainage well. In actual operation, the medium inside the drainage well exhibits complex fluid characteristics, consisting of a high-viscosity oil-water mixture, suspended solid particles, and colloidal deposits. Traditional detection methods use float-type level gauges to monitor the level in the drainage well, but this device has revealed significant defects during long-term operation: 1) The float mechanism is prone to jamming due to oil adhesion and impurity intrusion, leading to the failure of high and low level contact signals; 2) The detection unit lacks an anti-pollution protection structure, and under turbulent conditions, key sensor components are directly exposed to corrosive media, accelerating mechanical wear and degradation of electrical insulation performance. The aforementioned malfunctions will directly cause the sewage pump start-stop control logic to malfunction, preventing timely initiation of sewage discharge operations when the well liquid level exceeds the limit, thus leading to the overflow and spread of oily wastewater. This will not only induce safety hazards such as corrosion of underground oil depot equipment bases and electrical short circuits, but in severe cases, it will also force the entire rolling line's hydraulic lubrication system to shut down unplanned, causing significant economic losses to the continuous rolling production of medium and heavy plates. Utility Model Content

[0003] To address the problems existing in the prior art, this utility model provides a device that can solve the problem of float block failure in a linkage level gauge, thereby ensuring normal sewage discharge from underground sewage wells, preventing sewage overflow, and ensuring normal production of medium and heavy plates in oil depots.

[0004] This utility model is implemented as follows: a liquid level detection device for an oil depot drainage well includes a connecting rod float level gauge. A protective sleeve is coaxially fitted around the connecting rod of the float level gauge. The upper end of the protective sleeve is fixedly connected to the upper flange of the float level gauge, and the lower end of the protective sleeve is closed to form a blind end. At least one row of liquid inlet holes is provided on the lower side wall of the protective sleeve. An annular groove surrounding the outer wall of the protective sleeve is provided above the liquid inlet holes. An annular air chamber is embedded within the annular groove. Multiple air outlets inclined towards the axis of the protective sleeve are evenly distributed along the circumference of the lower surface of the annular air chamber. An air inlet connector penetrating the protective sleeve wall is provided at the upper part of the annular air chamber. The air inlet connector is connected to an external high-pressure air source through a high-pressure air inlet pipe.

[0005] The jet direction of the air outlet forms an angle of 15-60 degrees with the plane where the liquid inlet is located.

[0006] The lower end of the casing has a 200-mesh filter screen wrapped around the liquid inlet hole.

[0007] The outer wall of the casing is fixed with a high-pressure air inlet pipe fixing groove.

[0008] The air outlet is equipped with a one-way air outlet nozzle.

[0009] The advantages and technical effects of this invention are as follows: This liquid level detection device is optimized for the characteristics of the medium and heavy plate production environment, and its unique design completely avoids the risks of float jamming and malfunction. Its protective casing structure and inlet port configuration effectively isolate impurities and oil, and combined with the natural stratification of oil and water, ensures that the float operates stably in a clean environment, thereby accurately transmitting liquid level signals. This design not only significantly improves monitoring reliability but also builds a safety barrier for the oil depot's sewage discharge system, effectively preventing equipment failure and production stoppage risks caused by sewage overflow. With precise liquid level control and stable sewage discharge support, an external high-pressure air source provides an access point, allowing high-pressure gas to be easily introduced into the annular air chamber through the high-pressure air inlet pipe, realizing the purging of the inlet port area on the outer wall of the protective casing; this device provides a continuous and stable operating environment for the medium and heavy plate production process. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a three-dimensional structural diagram of the casing installation of this utility model; Figure 3 This is a schematic diagram of the filter installation structure; Figure 4 This is a schematic diagram of the installation structure of the high-pressure air intake pipe fixing groove.

[0011] In the diagram: 1. Connecting rod float level gauge; 11. Liquid inlet; 12. Annular groove; 2. Protective sleeve; 21. High-pressure air inlet pipe fixing groove; 3. Annular air chamber; 31. Air outlet; 32. Air inlet connector; 33. High-pressure air inlet pipe; 4. Filter screen; 5. One-way air outlet. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0013] Please see Figure 1 and Figure 2A liquid level detection device for an oil depot drainage well includes a connecting rod float level gauge 1, which is the core component for liquid level detection and is available on the market. The connecting rod float level gauge reflects changes in liquid level by the up-and-down movement of a float. It features a simple structure, intuitive measurement, and high reliability, making it suitable for environments like oil depot drainage wells that require accurate liquid level monitoring. The connecting rod of the level gauge is coaxially fitted with a protective sleeve 2. This sleeve provides additional protection for the connecting rod, preventing corrosion, impact, or blockage in the harsh environment of the drainage well, thus extending the service life of the level gauge and improving measurement accuracy. The upper end of the casing is fixedly connected to the upper flange of the connecting rod float level gauge, and the lower end of the casing is closed to form a blind end. The blind end design prevents impurities or liquids in the sewage well from directly entering the casing, protecting the connecting rod and float from contamination or damage, and also helps maintain the normal operation of the level gauge. The lower side wall of the casing has at least one row of liquid inlet holes 11. The liquid inlet holes allow liquids in the sewage well to enter the space between the casing and the connecting rod, but prevent impurities or large objects from entering, thus ensuring that the level gauge can accurately detect changes in liquid level. Above the liquid inlet holes, there is an annular groove 12 surrounding the outer wall of the casing. The annular groove provides installation space for the annular air chamber. The annular groove is embedded with an annular air chamber 3. The design of the annular air chamber allows high-pressure gas to be introduced into the casing through the air inlet connector. This gas can be ejected through the air outlet to form a purging effect on the liquid around the connecting rod and float, preventing impurities or viscous substances in the liquid from adhering to the connecting rod or float and affecting the accuracy of liquid level detection. The annular gas chamber can be formed by bending and sealing a corrosion-resistant metal or plastic tube. Multiple outlets 31, inclined towards the axis of the protective casing, are evenly distributed along the lower surface of the annular gas chamber's circumference. This outlet design allows the ejected gas to be more concentrated and directed towards the outer wall of the protective casing, improving the purging effect. The upper part of the annular gas chamber is equipped with an air inlet connector 32 that penetrates the protective casing wall. This inlet connector provides an access point for an external high-pressure gas source, allowing high-pressure gas to be easily introduced into the annular gas chamber through a high-pressure air inlet pipe, thus purging the liquid inlet area on the outer wall of the protective casing. The air inlet connector is connected to the external high-pressure gas source via a high-pressure air inlet pipe 33.

[0014] The air outlet's spray direction forms a 15-60 degree angle with the plane of the liquid inlet. This allows the gas to effectively purge the area around the connecting rod, preventing impurities from adhering and improving the accuracy of liquid level detection.

[0015] Please see Figure 3 The lower end of the protective sleeve has a 200-mesh filter screen 4 wrapped around the liquid inlet. This effectively intercepts impurities, preventing them from entering the sleeve, protecting the connecting rod and float, and ensuring stable and accurate liquid level detection.

[0016] Please see Figure 4The outer wall of the casing is fixedly provided with a high-pressure air inlet pipe fixing groove 21. This facilitates the secure installation of the high-pressure air inlet pipe, prevents it from shaking or falling off, ensures a stable supply of high-pressure gas, and improves the purging effect.

[0017] Please see Figure 4 To prevent liquid from entering the annular gas chamber, a one-way gas outlet 5 can also be installed at the gas outlet.

[0018] This liquid level detection device is interlocked with the start / stop button of the sewage pump and is specifically designed to monitor changes in the liquid level of the sewage well in an oil depot. During installation, the liquid level in the sewage well is first lowered to its lowest point, and then the linkage level gauge is precisely installed, ensuring it is compatible with the sewage well environment. As the sewage level gradually rises, the casing, as a key protective component, effectively prevents debris from entering its interior, allowing liquid to enter only through the inlet hole on the lower side wall into the space between the casing and the linkage. Because oil is less dense than water, oil cannot enter the casing. Under this special condition, the float inside the linkage completely avoids direct contact with debris and oil, fundamentally eliminating the risk of float jamming or malfunction, ensuring the accuracy and reliability of the liquid level detection. When the liquid level reaches a preset threshold, the level gauge quickly transmits a signal to the start / stop button of the sewage pump via wiring, thereby intelligently controlling the start or stop of the sewage pump. This interconnected mechanism effectively prevents potential safety hazards caused by sewage overflow to underground oil depot equipment, providing a solid guarantee for the safe operation of the oil depot, while ensuring the stability and continuity of related medium and heavy plate production processes. Furthermore, periodically, an external high-pressure air source delivers gas through an annular air chamber from the outlet, powerfully purging the area around the connecting rod and float. This design not only efficiently removes blockages and restores the level gauge to normal operation, but also further prevents impurities from adhering, improving the overall performance and lifespan of the equipment.

[0019] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A liquid level detection device for an oil depot drainage well, comprising a connecting rod float level gauge, characterized in that: The connecting rod of the float level gauge is coaxially fitted with a protective sleeve. The upper end of the protective sleeve is fixedly connected to the upper flange of the float level gauge, and the lower end of the protective sleeve is closed to form a blind end. At least one row of liquid inlet holes is opened on the lower side wall of the protective sleeve, and an annular groove surrounding the outer wall of the protective sleeve is provided above the liquid inlet holes. An annular air chamber is embedded in the annular groove. The lower surface of the annular air chamber has multiple air outlets that are evenly distributed along the circumference and inclined towards the axis of the protective sleeve. An air inlet connector penetrating the wall of the protective sleeve is provided at the upper part of the annular air chamber. The air inlet connector is connected to an external high-pressure air source through a high-pressure air inlet pipe.

2. The liquid level detection device for the oil depot drainage well according to claim 1, characterized in that: The jet direction of the air outlet forms an angle of 15-60 degrees with the plane where the liquid inlet is located.

3. The liquid level detection device for the oil depot's sewage well according to claim 1, characterized in that: The lower end of the casing has a 200-mesh filter screen wrapped around the liquid inlet hole.

4. The liquid level detection device for the oil depot drainage well according to claim 1, characterized in that: The outer wall of the casing is fixed with a high-pressure air inlet pipe fixing groove.

5. The liquid level detection device for the oil depot drainage well according to claim 1, characterized in that: The air outlet is equipped with a one-way air outlet nozzle.

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