A kind of lubricating oil recovery device for centrifugal pump isolation liquid tank

Abstract

This invention provides a lubricating oil recovery device for a centrifugal pump's isolation liquid tank, comprising an isolation liquid tank (with a drain port and a fill port at the bottom, the drain port connected to a drain pipeline), an oil storage tank (with a fill port at the top, an inflatable air bladder inside, and an oil drain port and an air inlet at the bottom, connected to an oil drain pipeline and a purified air inlet pipe, respectively), and connecting components (a flexible metal hose, one end of which is detachably connected to the oil drain pipeline, and the other end optionally connected to the drain pipeline or the fill port). The isolation liquid tank is installed at a higher height than the oil storage tank. When the air bladder is depressurized, the flexible metal hose connects the oil drain pipeline and the drain pipeline, utilizing the self-pressure of the liquid level in the isolation liquid tank to recover lubricating oil to the oil storage tank; when the oil storage tank is full of oil and the air bladder is inflated, the flexible metal hose connects the oil drain pipeline and the fill port, and purified air is injected into the isolation liquid tank under pressure. This invention eliminates the need to modify the centrifugal pump's isolation liquid tank, facilitating recovery and filling, reducing time and labor, preventing spillage and pollution, improving safety, and achieving closed-loop recovery and filling.

Description

Technical Field

[0001] This utility model pertains to petroleum refining oil and gas recovery devices, specifically relating to a lubricating oil recovery device for a centrifugal pump isolation tank. Background Technology

[0002] In the petrochemical industry, centrifugal pumps are one of the key pieces of equipment, operating in complex environments, typically involving high temperatures, high pressures, high speeds, and corrosive media. The isolation tank, as a core component of the centrifugal pump's mechanical seal system, undertakes important functions such as lubrication, cooling, rust prevention, sealing, and vibration damping. The stable supply of lubricating oil within the tank directly affects the reliability of the mechanical seal and the long-term operation of the equipment.

[0003] Currently, during centrifugal pump overhauls or periodic lubricant oil changes, the lubricating oil in the isolation tank needs to be recovered through a bottom drain valve. Traditional operating methods have the following problems:

[0004] 1. Low recycling efficiency and safety hazards: Maintenance personnel need to hold containers (such as basins or buckets) to collect lubricating oil. Holding them for a long time can easily lead to arm fatigue, and even cause lubricating oil to spill due to unstable operation, contaminating equipment and the ground, and increasing the risk of slipping.

[0005] 2. High risk of environmental pollution: Lubricating oil is easy to drip onto the ground or equipment surface, which is difficult to collect completely, violating environmental management requirements; at the same time, open recycling leads to the volatilization of lubricating oil, resulting in the fugitive emission of VOCs (volatile organic compounds).

[0006] 3. Poor sealing during refueling: When adding lubricating oil, leakage is likely to occur due to the size limitation of the filler neck and the lack of sealing measures, which further aggravates pollution and waste of resources.

[0007] In the prior art, the utility model with authorization announcement number CN213285794U discloses a machining lubricating oil recovery device, including rollers, crossbars, fixing plates, storage tanks, sealing covers, oil outlets, handles, grooves, grips, filter screens, fixing frames, hinges, tank covers, and oil inlets. This utility model has an oil inlet at the top of the storage tank, with a fixing frame for fixed placement on the inlet. A filter screen is installed on the fixing frame. During the lubricating oil recovery process, solid particles or other impurities are easily mixed into the lubricating oil, which can easily cause blockages during use. During recovery, the lubricating oil passes through the oil inlet and is filtered by the filter screen, trapping solid particles or other impurities. After recovery is complete, the filter screen can be removed via the handle to empty the impurities, facilitating use. Furthermore, rollers are installed at the bottom of the storage tank, allowing for fluid lubricating oil recovery, resulting in a wide recovery range and high recovery efficiency. Although the device is equipped with rollers at the bottom for mobile recycling, improving its mobility, the threaded seals of its storage tanks are prone to wear from frequent disassembly and assembly, potentially leading to VOC emissions over long-term use. Furthermore, the device requires strict horizontal placement to ensure effective gravity-flow recycling, making it unsuitable for various terrains. For some isolated liquid tanks in unusual locations, recycling operations may not be convenient; the sealing caps of the storage tanks may not guarantee a complete seal in actual use, posing a risk of lubricant evaporation and failing to meet environmental requirements, potentially resulting in lubricant waste. Moreover, the device's design remains relatively mechanical, requiring manual intervention for handling and emptying, essentially making it a semi-open operation that cannot completely eliminate pollution and safety risks.

[0008] Utility model patent CN207049588U discloses a lubricating oil recovery device, including a container bottle and a port connection assembly installed on the upper port of the container bottle. The port connection assembly is connected to an oil extraction pipe and a vacuum pipe. The port connection assembly includes a port plug and a lubricating oil internal central tube, with the upper end of the internal central tube inserted into the port plug, forming an annular space between them. The port connection assembly also includes a lubricating oil inlet connector and a vacuum outlet connector. The lubricating oil inlet connector is individually connected to the upper end of the internal central tube, and the vacuum outlet connector is individually connected to the annular space between the internal central tube and the plug. This lubricating oil recovery device has a simple structure and is easy to operate. The core recovery component is the container bottle, and the design focuses on practicality and efficiency. When the container bottle is full of lubricating oil, it can be emptied and reused by filling the gas chamber with nitrogen at the recovery point. This design not only adapts to various lubricating oil recovery scenarios but also avoids frequent container bottle replacements, significantly improving overall recovery efficiency. This invention achieves a zero-leakage "recovery-filling" closed loop through dual-power drive of airbag pressurization and liquid level self-pressure; the design of the mobile bracket and quick-connect hose is suitable for complex scenarios such as high positions and narrow spaces; the large-capacity oil storage of a single tank (50-200L) reduces the frequency of interruptions and fundamentally avoids the functional and safety shortcomings of existing technologies.

[0009] In summary, current methods and existing recovery devices for recovering lubricating oil from the isolation tank of centrifugal pumps have significant shortcomings. Therefore, there is an urgent need to design a dedicated recovery device to achieve closed-loop, efficient recovery and refilling of lubricating oil, fundamentally solving the aforementioned problems and improving equipment maintenance quality and environmental friendliness. Utility Model Content

[0010] In order to solve the problems of easy spillage and pollution caused by lubricating oil recovery in the existing technology, high manual operation intensity and low efficiency, and risk of volatile pollution due to non-sealed refueling process, the purpose of this utility model is to provide a lubricating oil recovery device for a centrifugal pump with an isolation liquid tank.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] This utility model proposes a lubricating oil recovery device for a centrifugal pump's isolation tank, including...

[0013] The isolation liquid tank is equipped with an air vent and an oil filling port at the bottom, and the air vent is connected to an air vent pipeline.

[0014] An oil storage tank is provided with a filling port at the top and an inflatable and ventable air bladder inside. The bottom of the oil storage tank is provided with an oil drain port and an air inlet. The oil drain port is connected to an oil drain pipeline, and the air inlet is connected to a purified air inlet pipe. One end of the purified air inlet pipe extends into the air bladder, and the other end of the purified air inlet pipe is connected to an external air source.

[0015] A metal hose, one end of which is detachably connected to the drain line, and the other end of which can be selectively connected to the drain line or the filler port;

[0016] The installation height of the isolation liquid tank is higher than that of the oil storage tank;

[0017] When the airbag is depressurized, the metal hose connects the oil storage tank drain line to the emptying line of the isolation liquid tank, and uses the self-pressure of the liquid level in the isolation liquid tank to drive the lubricating oil to be recovered to the oil storage tank.

[0018] With the oil storage tank filled with lubricating oil and the air bladder inflated, a metal hose connects the oil drain line of the oil storage tank to the filling port of the isolation liquid tank. The purification air inlet pipe inflates and pressurizes the air bladder, driving the lubricating oil to be injected into the isolation liquid tank.

[0019] Furthermore, the top of the oil storage tank is also equipped with a venting line, one end of which extends into the airbag.

[0020] Furthermore, a control valve is provided on the venting line to control the opening and closing of the venting line.

[0021] Furthermore, both ends of the metal hose are equipped with quick connectors, and the drain line of the isolation liquid tank, the filling port, and the oil drain line of the oil storage tank are all equipped with interfaces adapted to the quick connectors.

[0022] Furthermore, a first valve is provided on the drain line of the isolation liquid tank to control the opening and closing of the drain line.

[0023] Furthermore, a second control valve is provided on the oil drain line of the oil storage tank to control the opening and closing of the oil drain line.

[0024] Furthermore, a third control valve is provided on the purified air inlet pipe to control the opening and closing of the purified air inlet pipe, so as to regulate the purified air supply status entering the airbag.

[0025] Furthermore, the purified air inlet pipe is also equipped with a pressure regulator for adjusting the pressure of the purified air entering the oil storage tank.

[0026] Furthermore, the oil storage tank is equipped with a level gauge to display the level of lubricating oil inside the tank.

[0027] Furthermore, the oil storage tank is mounted on a movable support, and the movable support is equipped with a handle.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] ①Environmentally friendly: It achieves fully enclosed recycling and filling of lubricating oil, completely eliminating oil spillage and evaporation pollution;

[0030] ② High efficiency: Significantly reduces manual labor intensity and improves work efficiency;

[0031] ③ Safety: Eliminate safety hazards associated with manual operation;

[0032] ④ Economic efficiency: Simple structure, low cost, and no need to modify existing equipment;

[0033] ⑤ Multifunctionality: It integrates recycling and refueling functions, making it easy to operate. Attached Figure Description

[0034] To more clearly illustrate the solutions in this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of a lubricating oil recovery device for a centrifugal pump's isolation tank.

[0036] Figure 2 This is a schematic diagram of the isolation liquid tank.

[0037] The above figures include the following reference numerals:

[0038] 1. Isolation tank; 101. Filler port; 102. Drain line; 1021. First valve; 103. Vent port;

[0039] 2. Oil storage tank; 201. Filling port; 202. Vent line; 2021. First control valve; 203. Oil drain line; 2031. Second control valve; 204. Purified air inlet pipe; 2041. Third control valve; 205. Pressure regulator; 206. Level gauge;

[0040] 3. Airbags;

[0041] 4. Metal flexible hose;

[0042] 5. Portable stand;

[0043] 6. Handle. Detailed Implementation

[0044] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0045] It should be noted that in the embodiments of the present invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0046] In one typical embodiment of this application, a centrifugal pump isolation tank lubricating oil recovery device is provided, including an isolation tank 1, an oil storage tank 2, and a connecting assembly, as shown in the reference. Figure 1 The bottom of the isolation liquid tank 1 is equipped with a filler port 101 and a drain port, and a drain pipeline 102 is connected to the drain port. (Refer to...) Figure 2 The oil storage tank 2 has a filling port 201 at the middle of the top for replenishing lubricating oil into the oil storage tank 2; the oil storage tank 2 has an inflatable and ventable air bladder 3 inside, and an oil drain port and an air inlet port at the bottom of the oil storage tank 2. The oil drain port is connected to an oil drain line 203, and the air inlet port is connected to a purified air inlet pipe 204. One end of the purified air inlet pipe 204 extends into the air bladder 3, and the other end of the purified air inlet pipe 204 is connected to an external air source; one end of the metal hose 4 is detachably connected to the oil drain line 203, and the other end of the metal hose 4 can be selectively connected to the vent line 102 or the filling port 101. The installation height of the isolation liquid tank 1 is higher than that of the oil storage tank 2.

[0047] When the airbag 3 is depressurized, the metal hose 4 connects the oil drain line 203 and the vent line 102, and the lubricating oil is recovered to the oil storage tank 2 by the self-pressure of the liquid level in the isolation tank 1.

[0048] With the oil storage tank 2 filled with lubricating oil and the air bag 3 inflated, the metal hose 4 connects the oil drain line 203 to the oil filling port 101. The purification air inlet pipe 204 inflates and pressurizes the air bag 3, driving the lubricating oil to be injected into the isolation liquid tank 1.

[0049] The above-mentioned centrifugal pump isolation tank lubricating oil recovery device can achieve the following functions: ① Lubricating oil recovery:

[0050] When overhauling the centrifugal pump or changing the lubricating oil, connect the drain line 102 of the isolation tank 1 to the oil drain line 203 of the oil storage tank 2. Utilizing the self-pressure of the isolation tank 1, the lubricating oil automatically flows into the oil storage tank, achieving closed-loop recovery. This process requires no modification to the centrifugal pump's isolation tank, is simple to operate, avoids lubricating oil spillage and contamination, and requires no pumping power, with no lubricating oil exposure.

[0051] ② Lubricating oil filling function:

[0052] When lubricating oil needs to be added, first fill oil storage tank 2 with lubricating oil through the filling port 201 at the top of oil storage tank 2. Then, connect the oil drain line 203 of oil storage tank 2 to the filling port 101 at the bottom of isolation liquid tank 1 through the metal hose 4. Turn on the purification air duct 204, and use air pressure to force the lubricating oil into isolation liquid tank 1, achieving closed-loop filling. The entire process does not require manual pouring, eliminating lubricating oil dripping and evaporation pollution.

[0053] As a further improvement to the above embodiment, a venting line 202 is connected to the top of the oil storage tank 2. One end of the venting line 202 extends into the airbag 3 to directly release the gas inside the airbag 3, thereby depressurizing the airbag 3.

[0054] More preferably, a first control valve 2021 is provided on the vent line 202 to control the opening and closing of the vent line 202.

[0055] As a further improvement to the above embodiment, it is preferable to provide a sealable cover or valve at the filling port 201 of the oil storage tank 2.

[0056] As a further optimization of the above-described embodiment, quick connectors are provided at both ends of the metal hose 4, and interfaces adapted to the quick connectors are provided on the drain line 102 of the isolation liquid tank 1, the filling port 101, and the oil drain line 203 of the oil storage tank 2.

[0057] As a further improvement to the above embodiment, preferably, a first valve 1021 is provided on the drain line 102 of the isolation liquid tank 1 to control the opening and closing of the drain line 102. A second control valve 2031 is provided on the oil drain line 203 of the oil storage tank 2 to control the opening and closing of the oil drain line 203. A third control valve 2041 is provided on the purification air inlet pipe 204 of the oil storage tank 2 to control the opening and closing of the purification air inlet pipe 204, so as to regulate the purification air supply state entering the airbag 3.

[0058] Furthermore, a pressure regulator 205 is also provided on the purification air inlet pipe 204 to regulate the pressure of the purification air entering the oil storage tank 2.

[0059] As a further improvement to the above embodiment, it is preferable to provide a level gauge 206 on the oil storage tank 2 to display the level of lubricating oil in the oil storage tank 2.

[0060] As a further improvement to the above embodiment, it is preferable to provide an exhaust port 103 at the top of the isolation liquid tank 1 to balance the air pressure inside the tank during the lubricating oil recovery or filling process and ensure smooth liquid flow.

[0061] It is worth mentioning that the oil storage tank 2 is preferably installed on the mobile support 5, which is equipped with a handle 6 to facilitate the convenient movement of the oil storage tank 2, so as to dock with the isolation liquid tank 1 in different locations and adapt to different recycling and filling scenarios.

[0062] When the centrifugal pump is overhauled or the lubricating oil is changed periodically, the lubricating oil in the isolation tank needs to be drained. The drain line 102 of the isolation tank 1 is connected to the oil drain line 203 of the oil storage tank 2. The self-pressure of the isolation tank 1 allows the lubricating oil to enter the oil storage tank 2 of the centrifugal pump isolation tank lubricating oil recovery device, realizing the closed recovery of lubricating oil and avoiding lubricating oil dripping onto the ground and causing environmental pollution. At the same time, this embodiment does not require any modification to the centrifugal pump isolation tank, reducing the intensity of manual labor and improving work efficiency.

[0063] When lubricating oil needs to be added after centrifugal pump maintenance or during lubricant replacement, fill oil storage tank 2 of this tooling with lubricating oil. Connect metal hose 4 to the refilling position at the bottom of isolation tank 1. Introduce purified air from the device into the air inlet of the lubricating oil recovery device in the isolation tank. Open the valves of the purified air and the lubricating oil recovery device in the isolation tank, and use air pressure to force the lubricating oil into isolation tank 1, thus achieving sealed refilling of the isolation tank. This avoids lubricating oil dripping onto the ground during refilling, preventing environmental pollution. Furthermore, this embodiment requires no modification to the centrifugal pump isolation tank, reducing manual labor intensity, saving time and effort, and improving work efficiency.

[0064] This utility model also provides a lubricating oil recovery method based on the above-mentioned centrifugal pump isolation tank lubricating oil recovery device, including the following steps:

[0065] 1. Open the venting line 202 that extends into the airbag 3;

[0066] 2. Connect the oil drain line 203 of the oil storage tank 2 to the drain line 102 at the bottom of the isolation liquid tank 1 via the metal hose 4;

[0067] 3. Open the bottom valve of the isolation liquid tank 1, and the lubricating oil will automatically flow into the oil storage tank 2 under the gravity pressure difference;

[0068] 4. Complete closed-loop recovery with no lubricating oil exposure throughout the process.

[0069] This utility model further provides a lubricating oil filling method based on the above-mentioned centrifugal pump isolation tank lubricating oil recovery device, including the following steps:

[0070] 1. Fill the oil storage tank 2 with lubricating oil through the filling port 201 located in the middle of the top of the oil storage tank 2;

[0071] 2. Connect the oil drain line 203 of the oil storage tank 2 to the filling port 101 at the bottom of the isolation liquid tank 1 via the metal hose 4;

[0072] 3. Connect the purified air source and open the third control valve 2041 on the purified air inlet pipe 204;

[0073] 4. The purified air inlet pipe 204 inflates and pressurizes the airbag 3, using the air pressure to force the lubricating oil into the isolation liquid tank 1;

[0074] 5. After the target liquid level is reached, turn off the air source and disconnect the metal hose 4 to complete the sealed filling.

[0075] This invention, through its innovative pneumatic oil storage tank design, combining self-pressure and air pressure principles, perfectly solves various problems in the recovery and refilling of lubricating oil in the centrifugal pump isolation tank. The device is easy to operate, safe, reliable, and offers significant economic and environmental benefits.

[0076] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A lubricating oil recovery device for a centrifugal pump's isolation tank, characterized in that: include The isolation liquid tank is equipped with a filler port and a drain port at the bottom, and a drain line is connected to the drain port. The oil storage tank has a filling port at the top, an inflatable and ventable air bladder inside, and an oil drain port and an air inlet at the bottom. The oil drain port is connected to an oil drain pipeline, and the air inlet is connected to a purified air inlet pipe. One end of the purified air inlet pipe extends into the air bladder, and the other end is connected to an external air source. A metal hose, one end of which can be detachably connected to an oil drain line, and the other end can be selectively connected to an empty drain line or an oil filler port; The installation height of the isolation liquid tank is higher than that of the oil storage tank; When the airbag is depressurized, the metal hose connects the oil drain line and the air drain line, and the lubricating oil is recovered to the oil storage tank by the self-pressure of the liquid level in the isolation tank. With the oil storage tank filled with lubricating oil and the airbag inflated, the metal hose connects the oil drain line to the oil filling port, and the purification air inlet pipe inflates and pressurizes the airbag, driving the lubricating oil to be injected into the isolation liquid tank.

2. The centrifugal pump isolation tank lubricating oil recovery device as described in claim 1, characterized in that: The top of the oil storage tank is also equipped with a venting line, one end of which extends into the airbag.

3. The centrifugal pump isolation tank lubricating oil recovery device as described in claim 2, characterized in that: The venting line is equipped with a control valve to control the opening and closing of the venting line.

4. The centrifugal pump isolation tank lubricating oil recovery device as described in claim 1, characterized in that: Both ends of the metal hose are equipped with quick connectors, and the drain line of the isolation liquid tank, the filling port, and the oil drain line of the oil storage tank are all equipped with interfaces that are compatible with the quick connectors.

5. The centrifugal pump isolation tank lubricating oil recovery device as described in claim 1, characterized in that: The drain line of the isolation tank is equipped with a first valve to control the opening and closing of the drain line.

6. The centrifugal pump isolation tank lubricating oil recovery device as described in claim 1, characterized in that: The oil storage tank is equipped with a second control valve on the oil drain line to control the opening and closing of the oil drain line.

7. The centrifugal pump isolation tank lubricating oil recovery device as described in claim 1, characterized in that: The purified air inlet pipe is equipped with a third control valve, which is used to control the opening and closing of the purified air inlet pipe to regulate the purified air supply status entering the airbag.

8. The centrifugal pump isolation tank lubricating oil recovery device as described in claim 1 or 7, characterized in that: The purified air inlet pipe is also equipped with a pressure regulator to adjust the pressure of the purified air entering the oil storage tank.

9. The centrifugal pump isolation tank lubricating oil recovery device as described in claim 1, characterized in that: The oil storage tank is equipped with a level gauge to display the level of lubricating oil inside the tank.

10. The centrifugal pump isolation tank lubricating oil recovery device as described in claim 1, characterized in that: The oil storage tank is mounted on a mobile support, which is equipped with a handle.

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