An ultra-high viscosity index hydraulic oil water separation and purification device and hydraulic system

Abstract

This invention discloses an ultra-high viscosity index hydraulic oil-water separation and purification device and a hydraulic system. The oil-water separation and purification device includes: a demulsification device comprising a vertically arranged demulsification filter cylinder, wherein multiple demulsification filter elements are disposed within the demulsification filter cylinder; an oil-water separation device comprising a vertically arranged separation filter cylinder, wherein multiple oil-water separation filter elements are disposed within the separation filter cylinder; and a connecting device comprising a first transverse connecting pipe and a second transverse connecting pipe, both transversely arranged to connect the demulsification filter cylinder and the separation filter cylinder. The first transverse connecting pipe is positioned above the second transverse connecting pipe. The first transverse connecting pipe is used to prevent air accumulation, and the second transverse connecting pipe is used for the flow of hydraulic oil between the demulsification filter cylinder and the separation filter cylinder. The oil-water separation and purification device of this application can prevent air from accumulating in the demulsification filter cylinder and forming an air vortex, thereby achieving better oil-water separation and purification.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil-water separation and purification and environmental protection and energy saving hydraulic, and particularly relates to an oil-water separation and purification device for super high viscosity index hydraulic oil and a hydraulic system. BACKGROUND

[0002] The oil-water separation device is divided into two types of catering oil-water separator and industrial oil-water separator. The catering oil-water separator is generally used in the catering industry to treat sewage. In order to meet the requirements of environmental protection, the sewage generated in the machine room of the ship needs to be treated by the industrial oil-water separation device. Hydraulic oil is a hydraulic medium used in a hydraulic system using liquid pressure energy. For hydraulic oil, the first requirement is to meet the viscosity requirements of the hydraulic device at the working temperature and the starting temperature. Due to the working environment and other reasons, the water content of the hydraulic oil increases, which leads to the need to replace the hydraulic oil and is not conducive to environmental protection on the ship.

[0003] There are also oil-water separation devices in the prior art for oil-water separation and purification of hydraulic oil, but their precision and flux are limited, and they are difficult to adapt to super high viscosity index hydraulic oil. Moreover, the structure design of the oil-water separation and purification device in the prior art does not fully consider the disassembly and replacement of the filter element and the air accumulation in the initial state, and the structure has many unreasonable places, which cannot meet the efficient and high-precision oil-water separation and purification. SUMMARY

[0004] In view of the above defects or improvement needs of the prior art, the present application provides an oil-water separation and purification device for super high viscosity index hydraulic oil and a hydraulic system, which can prevent air from accumulating in the demulsification filter element cylinder to form a cyclone, facilitate disassembly and replacement of the filter element, better realize oil-water separation and purification, realize the inlet of dirty oil and the outlet of clean oil, and complete the efficient recycling of hydraulic oil.

[0005] To achieve the above purpose, the present application adopts the following technical solutions.

[0006] In some embodiments, an oil-water separation and purification device for super high viscosity index hydraulic oil is provided, which comprises:

[0007] A demulsification device comprising a vertically arranged demulsification filter element cylinder, a plurality of demulsification filter elements being arranged in the demulsification filter element cylinder;

[0008] An oil-water separation device comprising a vertically arranged separation filter element cylinder, a plurality of oil-water separation filter elements being arranged in the separation filter element cylinder;

[0009] The communication device comprises a first transverse communication pipe and a second transverse communication pipe, both of which are arranged transversely to communicate the demulsification filter cartridge body and the separation filter cartridge body, the first transverse communication pipe is arranged above the second transverse communication pipe, the first transverse communication pipe is used to avoid air accumulation, and the second transverse communication pipe is used for the flow of hydraulic oil between the demulsification filter cartridge body and the separation filter cartridge body.

[0010] In some embodiments, the inner diameter of the first transverse communication pipe is smaller than the inner diameter of the second transverse communication pipe.

[0011] In some embodiments, three oil-water separation filters are arranged vertically in the separation filter cartridge body.

[0012] Four demulsification filters are arranged vertically in the demulsification filter cartridge body.

[0013] In some embodiments, the demulsification filter cartridge body comprises a first cartridge cover detachably connected, the separation filter cartridge body comprises a second cartridge cover detachably connected; the demulsification filter can be disassembled and replaced from the upper part of the demulsification filter cartridge body, and the oil-water separation filter can be disassembled and replaced from the upper part of the separation filter cartridge body.

[0014] In some embodiments, the oil-water separation purification device comprises a differential pressure monitoring module, and the differential pressure monitoring module comprises a first pipe, a second pipe and a differential pressure switch.

[0015] The differential pressure switch is arranged on the side wall of the separation cartridge body, one end of the first pipe is connected to the differential pressure switch, and the other end extends upward through the demulsification cartridge body into the oil inlet cavity; one end of the second pipe is connected to the differential pressure switch, and the other end extends upward through the separation cartridge body into the oil outlet cavity.

[0016] In some embodiments, the oil-water separation purification device further comprises a high oil level switch and a low oil level switch; the high oil level switch is arranged on the second cartridge cover and communicates with the inside of the separation filter cartridge body.

[0017] The low oil level switch is arranged at the lower part of the demulsification filter cartridge body.

[0018] In some embodiments, at least one of the first pipe and the second pipe passes through the first transverse communication pipe and enters the demulsification filter cartridge body from the communication between the first transverse communication pipe and the demulsification filter cartridge body or enters the separation filter cartridge body from the communication between the first transverse communication pipe and the separation filter cartridge body.

[0019] In some embodiments, the demulsification filter comprises a net inner layer, a stainless steel mesh layer and a net outer layer arranged radially from inside to outside.

[0020] The inner layer of the mesh comprises a first filter layer and a second filter layer arranged radially from inside to outside, the precision of the first filter layer is less than the precision of the second filter layer.

[0021] In some embodiments, the precision of the first filter layer is not greater than 10 μm, and the precision of the second filter layer is not greater than 35 μm.

[0022] In some embodiments, the outer layer of the mesh comprises a water-absorbing filter layer, a first glass mesh filter layer, a filtering filter layer, a second glass mesh filter layer, and a water-absorbing sock layer arranged radially from inside to outside, and the water drop adsorption force of each layer of filter gradually increases from inside to outside.

[0023] In some embodiments, the oil-water separation filter core comprises a nano-graphene mesh film, and the contact angle of water on the surface of the nano-graphene mesh film is greater than 150°.

[0024] In some embodiments, the oil inlet is used to be connected with a hydraulic oil tank, and the oil outlet is used to be connected with the hydraulic oil tank.

[0025] In some embodiments, a hydraulic system is also provided, and the hydraulic system comprises the oil-water separation and purification device according to any one of the above.

[0026] Compared with the prior art, the beneficial effects of the present application are at least: in some embodiments, the first transverse communication pipe communicates the demulsification filter core barrel and the separation filter core barrel, so that the pressure in the demulsification filter core barrel and the separation filter core barrel can be kept as consistent as possible, and a large pressure difference is avoided, thereby preventing air from gathering in the demulsification filter core barrel to form a cyclone.

[0027] In some embodiments, the first pipe extends upward through the demulsification barrel into the oil inlet cavity, and the second pipe extends upward through the separation barrel into the oil outlet cavity, which facilitates disassembly and installation.

[0028] In some embodiments, at least one of the first pipe and the second pipe passes through the first transverse communication pipe and enters the demulsification filter core barrel from the communication position of the first transverse communication pipe and the demulsification filter core barrel or enters the separation filter core barrel from the communication position of the first transverse communication pipe and the separation filter core barrel, so that the space of the existing first transverse communication pipe is fully utilized, and excessive holes are avoided on the demulsification filter core barrel or the separation filter core barrel.

[0029] It should be noted that the above beneficial effects are only the advantages and benefits of some embodiments of the present application relative to the prior art, and the beneficial effects of the present application are not limited thereto. For details, please refer to the description and records of the relevant technical solutions in the specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1Front view of the oil-water separation and purification device for super-high viscosity index hydraulic oil according to an embodiment of the present application.

[0031] Figure 2 Front view of the oil-water separation and purification device for super-high viscosity index hydraulic oil according to another embodiment of the present application.

[0032] Figure 3 Front view of the oil-water separation and purification device for super-high viscosity index hydraulic oil according to another embodiment of the present application.

[0033] Figure 4 Top view of the oil-water separation and purification device for super-high viscosity index hydraulic oil according to an embodiment of the present application.

[0034] Figure 5 Partial structure diagram of the demulsification filter cartridge according to some embodiments.

[0035] Figure 6 Partial structure diagram of the separation filter cartridge according to some embodiments.

[0036] Figure 7 Partial structure diagram of the demulsification filter according to some embodiments.

[0037] Figure 8 Structure diagram of the demulsification membrane according to some embodiments.

[0038] Figure 9 Structure diagram of the oil-water separation filter according to some embodiments.

[0039] Figure 10 Structure diagram of the oil-water separation membrane according to some embodiments.

[0040] Figure 11 Diagram of the oil-water separation and purification device according to some embodiments.

[0041] Figure 12 Diagram of the method of oil-water separation and purification according to some embodiments.

[0042] Legend: demulsification device 1000; oil-water separation device 2000; communication device 3000; high oil level switch 4000; low oil level switch 5000; first pressure gauge 6000; second pressure gauge 7000; differential pressure monitoring module 8000;

[0043] Demulsification filter cartridge 1100, oil inlet 1101, first cartridge cover 1102, demulsification barrel body 1103, first exhaust port 1104, handle 1105, first flange 1106, first pressing plate 1107;

[0044] Demulsifying filter element 1200; first pull rod 1201, end cap 1202, filter element adhesive 1203, demulsifying membrane 1204;

[0045] Inner mesh layer 1210, first filter media layer 1211, second filter media layer 1212; stainless steel mesh layer 1220; outer mesh layer 1230, absorbent filter media layer 1231, first fiberglass mesh filter media layer 1232, filter media layer 1233, second fiberglass mesh filter media layer 1234, absorbent sock layer 1235;

[0046] Separator filter cylinder 2100, oil outlet 2101, second cylinder cover 2102, separator cylinder body 2103, second exhaust port 2104, pressure plate 2105, second flange 2106, second pressure plate 2107.

[0047] Oil-water separator filter element 2200, second pull rod 2201, oil-water separator membrane 2202;

[0048] First transverse connecting pipe 3100, second transverse connecting pipe 3200;

[0049] First pipeline 8001, second pipeline 8002, differential pressure switch 8003;

[0050] Junction box 9001, water level switch 9002, solenoid valve 9003, flow switch 9004, ball valve 9005. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0053] Figure 1 This is a front view of an ultra-high viscosity index hydraulic oil-water separation and purification device according to an embodiment of the present invention. Figure 2This is a side view of an ultra-high viscosity index hydraulic oil-water separation and purification device according to an embodiment of the present invention. (Reference) Figure 1 and Figure 2 In some embodiments of this application, an ultra-high viscosity index hydraulic oil-water separation and purification device is provided, the oil-water separation and purification device including a demulsification device 1000, an oil-water separation device 2000, and a connecting device 3000.

[0054] The demulsification device 1000 includes a vertically arranged demulsification filter cylinder 1100, and a plurality of demulsification filter elements 1200 are provided inside the demulsification filter cylinder.

[0055] The oil-water separation device 2000 includes a vertically arranged separation filter element cylinder 2100, and a plurality of oil-water separation filter elements 2200 are provided inside the separation filter element cylinder.

[0056] The connecting device 3000 includes a first transverse connecting pipe 3100 and a second transverse connecting pipe 3200, both transversely arranged to connect the demulsifying filter cartridge body and the separating filter cartridge body. The first transverse connecting pipe is positioned above the second transverse connecting pipe. The first transverse connecting pipe is used to prevent air accumulation, while the second transverse connecting pipe is used for the flow of hydraulic oil between the demulsifying filter cartridge body and the separating filter cartridge body.

[0057] In the embodiments of this application, viscosity index refers to the amount by which the viscosity of a fluid changes with temperature. An ultra-high viscosity index means that the viscosity changes very little with temperature, which makes the hydraulic oil perform stably and consistently under different operating conditions. The oil-water separation and purification device is applied to the oil-water separation of ultra-high viscosity index hydraulic oil. The viscosity index of ultra-high viscosity index hydraulic oil is generally not lower than 180. An extremely high viscosity index causes water to disperse into small, uniformly dense particles after agitation, making it difficult for it to combine into large droplets and settle for separation.

[0058] In the embodiments of this application, the demulsifying filter cartridge contains multiple demulsifying filter cartridges, and the separating filter cartridge contains multiple oil-water separating filter cartridges. These are used to first demulsify the hydraulic oil with an ultra-high viscosity index, and then further separate the oil and water. Furthermore, the multiple demulsifying filter cartridges and multiple oil-water separating filter cartridges can ensure both separation accuracy and a large throughput, avoiding the situation where a single demulsifying filter cartridge or oil-water separating filter cartridge cannot simultaneously meet the accuracy and throughput requirements. Specifically, water-containing hydraulic oil enters the demulsification filter element cylinder through the oil inlet 1101 and enters the demulsification filter element. Through the special structure of the demulsification filter element filter material, the small water droplets in the emulsified oil (i.e., the water-in-oil phenomenon) are separated from the oil and combined into larger water droplets. The hydraulic oil and water droplets flow out from the outside of the demulsification filter element together and flow through the second transverse connecting pipe to the oil-water separation filter element inside the separation filter element cylinder. 99.99% of the water droplets are blocked outside the oil-water separation filter element. The hydraulic oil flows from the outside of the oil-water separation filter element into the inside of the oil-water separation filter element and then flows back to the oil tank through the oil outlet 2101.

[0059] In the embodiments of this application, the demulsifying filter element cylinder has an oil inlet 1101 at its upper center and an oil outlet 2101 at its upper center. The oil inlet and outlet are connected to the hydraulic oil tank. In the embodiments of this application, the oil-water separation and purification device itself does not have a pressurizing device. Hydraulic oil is directly transported from the oil tank to the oil inlet of the demulsifying filter element cylinder through a hydraulic oil pipeline. It is understood that a hydraulic pump is installed on the hydraulic oil pipeline, or the hydraulic pump can be installed in the oil tank. The hydraulic pump can be integrated into the hydraulic oil pipeline itself to provide hydraulic pressure. In the embodiments of this application, the oil-water separation and purification device can be directly connected to an existing hydraulic system, and the oil-water separation and purification device itself does not have a pressurizing device, making disassembly convenient. It also maintains the inlet pressure of the purification device consistent with the pressure inside the hydraulic oil pipeline, facilitating control of flow rate and throughput.

[0060] In the embodiments of this application, the demulsifying filter cylinder and the separating filter cylinder are vertically arranged, and the second transverse connecting pipe is horizontally arranged at the lower part of the demulsifying filter cylinder and the separating filter cylinder. The second transverse connecting pipe is a lower connecting pipe, through which hydraulic oil flows from the demulsifying filter cylinder into the separating filter cylinder. The connecting device also includes a first transverse connecting pipe, through which air in the demulsifying filter cylinder can flow into the separating filter cylinder and then be discharged. At the same time, the first transverse connecting pipe is horizontally arranged at the upper part of the demulsifying filter cylinder and the separating filter cylinder. The first transverse connecting pipe is an upper connecting pipe, connecting the demulsifying filter cylinder and the separating filter cylinder. This can maintain the pressure in the demulsifying filter cylinder and the separating filter cylinder as consistent as possible, avoiding the formation of an excessive pressure difference. This prevents air from accumulating in the demulsifying filter cylinder and forming an air vortex, and prevents the air in the demulsifying filter cylinder from increasing the flow rate of the hydraulic oil, thus affecting the settling of water droplets that accumulate and flow out of the demulsifying filter.

[0061] In some embodiments, the inner diameter of the first transverse connecting pipe is smaller than the inner diameter of the second transverse connecting pipe. In some embodiments, the inner diameter of the lower connecting pipe, i.e., the second transverse connecting pipe, is larger than the diameter of the oil inlet of the demulsifying filter element cylinder.

[0062] In the embodiments of this application, the inner diameter of the second transverse connecting pipe is set to be relatively large, which allows the oil in the demulsifying filter cartridge to enter the separating filter cartridge in a timely manner, preventing accumulation and eliminating turbulence.

[0063] Specifically, in some embodiments, the inner diameter of the oil inlet 1101 is 15-30 mm, and the inner diameter of the oil outlet 2101 is 15-30 mm, with the inner diameters of the oil inlet 1101 and the oil outlet 2101 being equal. In some embodiments, the inner diameter of the first transverse connecting pipe is 50-100 mm, and the inner diameter of the second transverse connecting pipe is 200-300 mm. In some embodiments, the outer diameters of the demulsifying filter cartridge and the separating filter cartridge are equal. The outer diameters of the demulsifying filter cartridge and the separating filter cartridge are 350-400 mm. The inner diameter of the second transverse connecting pipe is smaller than the outer diameters of the demulsifying filter cartridge and the separating filter cartridge.

[0064] In some embodiments, the demulsifying filter cartridge body 1100 includes a demulsifying barrel body 1103 and a first cover 1102 detachably connected to the demulsifying barrel body 1103, and the separating filter cartridge body 2100 includes a separating barrel body 2103 and a second cover 2102 detachably connected to the separating barrel body 2103; the demulsifying filter element can be removed and replaced from the upper part of the demulsifying filter cartridge body, and the oil-water separating filter element can be removed and replaced from the upper part of the separating filter cartridge body. Specifically, the main body of the demulsifying barrel body 1103 and the separating barrel body 2103 is cylindrical, and the first cover 1102 and the second cover 2102 are respectively disposed at the upper ends of the demulsifying barrel body 1103 and the separating barrel body 2103. The first cover 1102 is detachably connected to the demulsifying barrel body 1103 by screws. Specifically, the first cover 1102 and the demulsifying barrel body 1103 have a first flange 1106 around their periphery, and the first flange 1106 has a threaded hole. The first cover 1102 and the demulsifying barrel body 1103 are connected by screws passing through the first flange 1106. The second cover 2102 is detachably connected to the separating barrel body 2103 by screws. Specifically, the second cover 2102 and the separating barrel body 2103 have a second flange 2106 around their periphery, and the second flange 2106 has threaded holes. The second cover 2102 and the separating barrel body 2103 are connected by screws passing through the second flange 2106. In some embodiments, both the first cover 1102 and the second cover 2102 have lifting lugs 1105. Two lifting lugs 1105 are symmetrically arranged on the first cover 1102 and two lifting lugs 1105 are symmetrically arranged on the second cover 2102. The lifting lugs are used to lift the first cover 1102 and the second cover 2102 during disassembly and installation, facilitating disassembly and replacement.

[0065] In some embodiments, the demulsifying filter element 1200 is disposed inside the demulsifying barrel 1103, and an oil inlet cavity is provided between the first barrel cover 1102 and the demulsifying barrel 1103. The oil inlet cavity is connected to both the oil inlet 1101 and the demulsifying filter element 1200. Hydraulic oil enters the oil inlet cavity from the oil inlet 1101 and then flows into the demulsifying filter element 1200.

[0066] The oil-water separator filter element 2200 is disposed inside the separator cylinder 2103, and an oil outlet cavity is provided between the second cylinder cover 2102 and the separator cylinder 2103. The oil outlet cavity is connected to both the oil outlet 2101 and the oil-water separator filter element 2200. Hydraulic oil enters the oil outlet cavity from the oil-water separator filter element 2200 and then flows back to the oil tank from the oil outlet 2101.

[0067] In embodiments of this application, the oil inlet 1101 is located at the center of the first cylinder cover 1102, and the oil outlet 2101 is located at the center of the second cylinder cover 2102. In some embodiments, the first cylinder cover 1102 is further provided with a first exhaust port 1104, and the second cylinder cover 2102 is further provided with a second exhaust port 2104. Both the first exhaust port 1104 and the second exhaust port 2104 have exhaust valves. The first exhaust port 1104 and the second exhaust port 2104 are used to discharge air from the demulsifying filter cartridge body and the separating filter cartridge body, respectively. The first exhaust port 1104 communicates with the oil inlet cavity. The second exhaust port 2104 communicates with the oil outlet cavity.

[0068] In the embodiments of this application, during oil-water separation and purification, the demulsifying filter element cylinder 1100 and the separating filter element cylinder 2100 are connected through a first transverse connecting pipe 3100. In the initial stage of oil inlet, both the first exhaust port 1104 and the second exhaust port 2104 are open. Hydraulic oil enters the demulsifying filter element 1200 through the oil inlet 1101. Air inside the demulsifying filter element cylinder 1100 can enter the separating filter element cylinder through the first transverse connecting pipe 3100 and then exit through the second exhaust port 2104. The first transverse connecting pipe 3100 ensures timely and effective air removal, preventing turbulence caused by only venting through the first exhaust port when there is a large amount of hydraulic oil inside the demulsifying filter element cylinder.

[0069] In some embodiments, the oil-water separation and purification device further includes a high oil level switch 4000 and a low oil level switch 5000. The high oil level switch 4000 is disposed on the second cylinder cover 2102 and communicates with the interior of the separator filter cylinder. The low oil level switch 5000 is disposed at the lower part of the demulsifying filter cylinder 1100. In embodiments of this application, when the hydraulic oil inside the separator filter cylinder contacts the high oil level switch 4000, the high oil level switch 4000 can issue feedback to indicate that the oil fills the second cylinder cover 2102. When the high oil level switch 4000 issues feedback, the first vent 1104 and the second vent 2104 can be closed. In embodiments of this application, the low oil level switch 5000 is used to indicate that the oil level inside the demulsifying filter cylinder 1100 is below a preset height; when the oil level inside the demulsifying filter cylinder 1100 is below the preset height, the low oil level switch 5000 issues feedback.

[0070] In some embodiments, the oil-water separation and purification device further includes a first pressure gauge 6000 and a second pressure gauge 7000. The first pressure gauge 6000 is disposed on the first cylinder cover 1102 and communicates with the interior of the demulsifying filter cylinder 1100. The second pressure gauge 7000 is disposed on the second cylinder cover 2102 and communicates with the interior of the separation filter cylinder 2100. The first pressure gauge 6000 communicates with the oil inlet cavity and is used to monitor the oil inlet pressure. The second pressure gauge 7000 communicates with the oil outlet cavity and is used to monitor the oil outlet pressure. In some embodiments, the first pressure gauge 6000 also has an alarm module, configured to issue an alarm when the oil inlet pressure exceeds a preset pressure value. The second pressure gauge 7000 is configured for simple pressure monitoring and does not have an alarm function. In the embodiments of this application, the alarm module of the first pressure gauge 6000 can detect the maximum pressure value of the oil-water separation and purification device, promptly identify problems, and prevent irreversible damage caused by excessive pressure.

[0071] In some embodiments, the oil-water separation and purification device further includes a differential pressure monitoring module 8000. Specifically, the differential pressure monitoring module 8000 includes a first pipe 8001, a second pipe 8002, and a differential pressure switch 8003. The differential pressure switch 8003 is disposed outside the separator filter cylinder 2100, specifically fixed to the side wall of the separator cylinder 2103. One end of the first pipe 8001, i.e., the first end, is connected to the differential pressure switch 8003, and the other end, i.e., the second end, is disposed in the oil inlet cavity. One end of the second pipe 8002, i.e., the first end, is connected to the differential pressure switch 8003, and the other end, i.e., the second end, is disposed in the oil outlet cavity. Specifically, the first pipe 8001 extends upward through the demulsifying cylinder 1103 into the oil inlet cavity, and the second pipe 8002 extends upward through the separator cylinder 2103 into the oil outlet cavity.

[0072] In some embodiments of this application, at least one of the first pipe 8001 and the second pipe 8002 passes through the first transverse connecting pipe 3100 and enters the demulsifying filter cartridge 1100 from the connection between the first transverse connecting pipe 3100 and the demulsifying filter cartridge 1100 or from the connection between the first transverse connecting pipe 3100 and the separating filter cartridge 2100.

[0073] refer to Figure 1 In some embodiments, the first pipe 8001 passes through the first transverse connecting pipe 3100 and enters the demulsifying filter element cylinder 1100 from the connection between the first transverse connecting pipe 3100 and the demulsifying filter element cylinder 1100. The second end of the first pipe 8001 extends upward along the demulsifying filter element cylinder 1100 into the oil inlet cavity.

[0074] In some embodiments, the second pipe 8002 passes through the first transverse connecting pipe 3100 and enters the separator filter cylinder 2100 from the connection between the first transverse connecting pipe 3100 and the separator filter cylinder 2100. The second end of the second pipe 8002 extends upward along the separator filter cylinder 2100 into the oil outlet cavity.

[0075] In the embodiments of this application, the first pipe 8001 enters the oil inlet cavity of the demulsifying filter element cylinder 1100 from the first transverse connecting pipe 3100, and the second pipe 8002 enters the oil outlet cavity of the separating filter element cylinder 2100 from the first transverse connecting pipe 3100. This avoids setting interfaces from the first cylinder cover 1102 and the second cylinder cover 2102, and also avoids directly opening holes from the demulsifying cylinder body 1103 and the separating cylinder body 2103. This facilitates the disassembly and installation of the first cylinder cover 1102 and the second cylinder cover 2102, and makes it convenient to disassemble, install, and replace the demulsifying filter element and the separating filter element from the first cylinder cover 1102 and the second cylinder cover 2102. In the implementation of this application, the differential pressure switch 8003 can monitor the pressure difference between the oil inlet and the oil outlet, and issue an alarm when the pressure difference is greater than a preset pressure difference value.

[0076] Figure 3 This is a front view of a hydraulic oil-water separation and purification device with an ultra-high viscosity index according to other embodiments of the present invention. Figure 4 This is a top view schematic diagram of an ultra-high viscosity index hydraulic oil-water separation and purification device according to an embodiment of the present invention. (Reference) Figure 3 and Figure 4 In some embodiments of this application, when the length of the first transverse connecting pipe 3100 is relatively small, one of the first pipe 8001 and the second pipe 8002 enters the demulsifying filter cartridge body 1100 or the separating filter cartridge body 2100 from the first transverse connecting pipe 3100.

[0077] refer to Figure 3 In some embodiments, the first pipe 8001 enters the oil inlet cavity of the demulsifying filter cylinder 1100 from the first transverse connecting pipe 3100, and the second pipe 8002 enters the oil outlet cavity of the separating filter cylinder 2100 directly through an opening in the side wall of the separating filter cylinder 2100.

[0078] In the embodiments of this application, interfaces are avoided from the first cover 1102 and the second cover 2102, which facilitates the disassembly and installation of the first cover 1102 and the second cover 2102, and makes it convenient to disassemble and replace the demulsifying filter element and the separating filter element from the first cover 1102 and the second cover 2102. Furthermore, one of the first pipe 8001 and the second pipe 8002 enters the demulsifying filter element cylinder 1100 or the separating filter element cylinder 2100 from the first transverse connecting pipe 3100, making reasonable use of the space in the first transverse connecting pipe 3100 and ensuring connection reliability.

[0079] Figure 5 This is a partial structural schematic diagram of the demulsifying filter cartridge body in some embodiments. Figure 6 This is a partial structural diagram of the filter cartridge housing in some embodiments. In some embodiments, the demulsifying filter cartridge can be easily disassembled from the demulsifying filter cartridge housing for cleaning and replacement. Each demulsifying filter cartridge has dimensions of Φ130×500mm, an outer diameter of 130mm, and a height of 500mm. The oil-water separator filter cartridge can be easily disassembled and replaced from the top of the separator filter cartridge housing. Each oil-water separator filter cartridge has dimensions of Φ150×500mm, an outer diameter of 150mm, and a height of 500mm.

[0080] In the embodiments of this application, both the demulsifying filter element and the oil-water separating filter element can be disassembled and replaced from the top of the cylinder. Each filter element is designed to be small in size, and multiple filter elements are arranged in parallel, which makes disassembly and replacement more convenient while ensuring throughput.

[0081] In some embodiments, the demulsifying filter cartridge contains four demulsifying filter elements, which are vertically arranged. The separating filter cartridge contains three oil-water separating filter elements, which are vertically arranged.

[0082] In this embodiment, four demulsifying filter elements are evenly distributed circumferentially around the axis of the demulsifying barrel 1103. The centers of the four demulsifying filter elements are on the same arc, and the center of this arc coincides with the axis of the demulsifying barrel 1103. In this embodiment, the sludge in the oil inlet cavity simultaneously enters the inner cavity of the four demulsifying filter elements, then flows outward into the space between the inner wall of the demulsifying barrel 1103 and the demulsifying filter elements, and then flows into the separation filter element cylinder 2100 through the second transverse connecting pipe 3200.

[0083] In some embodiments, each demulsifying filter element is locked and fixed by a plurality of first pressure plates 1107. In some embodiments, each demulsifying filter element is locked and fixed by three circumferentially distributed first pressure plates 1107. In some embodiments, the first pressure plates 1107 are detachably connected to the demulsifying tank body 1103 or the first flange 1106. In the embodiments of this application, the demulsifying filter element is locked and fixed by the first pressure plates 1107, which are detachable or rotatable pressure plates to facilitate limiting the position of the demulsifying filter element.

[0084] In some embodiments, each demulsifying filter element has a first pull rod 1201 at its top. The first pull rod 1201 can be locked at both ends of the demulsifying filter element and also facilitates lifting the demulsifying filter element for easy disassembly and installation.

[0085] In the embodiments of this application, three oil-water separator filter elements are evenly distributed circumferentially around the axis of the separator cylinder 2103. The centers of the three oil-water separator filter elements are on the same arc, and the center of this arc coincides with the axis of the separator cylinder 2103. In the embodiments of this application, the sludge flowing into the separator filter cylinder 2100 passes through the three oil-water separator filter elements simultaneously before entering the inner cavity of the oil-water separator filter element, and then flows into the oil outlet cavity.

[0086] In some embodiments, each oil-water separator filter element is locked and fixed by a pressure plate 2105 and a plurality of second pressure plates 2107. In some embodiments, the pressure plate 2105 is positioned in the middle of three oil-water separator filter elements, simultaneously locking and fixing all three filter elements, making full use of space. Two second pressure plates 2107 are also provided on the outer side of each oil-water separator filter element. In some embodiments, the pressure plate 2105 and the plurality of second pressure plates 2107 are detachably connected to the separator body 2103 or the second flange 2106. In the embodiments of this application, the oil-water separator filter elements are locked and fixed by the pressure plate 2105 and the second pressure plates 2107, and the second pressure plates 2107 are detachable or rotatable pressure plates, facilitating the limiting of the oil-water separator filter elements.

[0087] In some embodiments, each oil-water separator filter element has a second pull rod 2201 at its top. The second pull rod 2201 can be locked at both ends of the oil-water separator filter element, making it easy to lift the oil-water separator filter element and facilitate disassembly and installation.

[0088] In some embodiments, the throughput of the oil-water separation and purification device is not less than 1.8 m³ / s. 3 / h.

[0089] In the embodiments of this application, the demulsifying filter element has a specification size of Φ130×500mm, with 4 elements, an effective height of 480mm, and a unit flux of KP0 = 3m³. 3 / ㎡ (pressure 0.8MPa, pressure difference ≦0.4MPa).

[0090] The flux of a single demulsifying filter element, KP1, = the side surface area of ​​the demulsifying filter element, SP × the unit flux, KP0 = (0.13 × 3.14 × 0.48) × 3m³ 3 / h=0.588m 3 / h.

[0091] The total flow rate of the demulsifying filter cartridge is KP2 = 0.588 m³. 3 / h×4=2.352m 3 / h.

[0092] In the embodiments of this application, four demulsifying filter elements are used, and the total throughput of the demulsifying filter element cylinder is greater than 1.8m. 3 / h.

[0093] In the embodiments of this application, the oil-water separator filter element has a specification of Φ150×500mm, with 3 elements, and an effective height of 480mm. The unit throughput of the oil-water separator filter element is KY0=3m³. 3 / ㎡.

[0094] The throughput of a single oil-water separator filter element, KY1, is calculated as follows: Oil-water separator filter element side surface area SY × Unit throughput KY0 = (0.15 × 3.14 × 0.48) × 3m³ 3 / h=0.678m 3 / h.

[0095] The total flux of the filter cartridge body is KY2 = 0.678 m³. 3 / h×3=2.034m 3 / h.

[0096] In the embodiments of this application, three oil-water separation filter elements are used, and the total throughput of the filter element cylinder is greater than 1.8m. 3 / h.

[0097] Figure 7 This is a partial structural schematic diagram of the demulsifying filter element in some embodiments. Figure 8 This is a schematic diagram of the demulsified membrane structure in some embodiments. Figure 8 for Figure 7 An enlarged schematic diagram of part A. In some embodiments, the demulsifying filter element has end caps 1202 at both ends, and the two ends of the demulsifying membrane are fixed inside the end caps 1202 by filter element adhesive 1203. In some embodiments, the demulsifying filter element 1200 includes a demulsifying membrane 1204. In some embodiments, the demulsifying membrane includes an inner mesh layer 1210, a stainless steel mesh layer 1220, and an outer mesh layer 1230 arranged radially from the inside to the outside. The inner mesh layer includes a first filter material layer 1211 and a second filter material layer 1212 arranged radially from the inside to the outside, wherein the precision of the first filter material layer is less than that of the second filter material layer. In some embodiments, the precision of the first filter material layer is not greater than 10 μm, and the precision of the second filter material layer is not greater than 35 μm.

[0098] In the embodiments of this application, the stainless steel mesh layer is made of stainless steel mesh, specifically 022Cr17Ni12Mo2, which has the advantages of high hardness, high strength, and easy cleaning. At the same time, it can filter impurities, demulsify, and is convenient for maintenance and replacement.

[0099] Two different filter media are composited within a stainless steel mesh to form a first filter media layer 1211 and a second filter media layer 1212. In some embodiments, the first filter media layer 1211 has a precision of 10 μm and a maximum pore size of only 10 μm. This first filter media layer can cut apart oil droplets containing water droplets within emulsified oil droplets, separating the fine water droplets from the oil droplets. In some embodiments, the second filter media layer has a precision of 35 μm. It primarily utilizes the difference in surface tension between water and oil to create two flow velocities for the water and oil droplets, with the water droplets flowing slower than the oil droplets, allowing the water droplets to combine. In the embodiments of this application, the surface tension of water is 72.75 × 10⁻⁶. -3 The surface tension of the ultra-high viscosity index hydraulic oil is 17.7 mN / m. In some embodiments, the first filter layer can have 3-5 layers of filter media, and the second filter layer can have 7-10 layers of filter media to ensure accuracy. In some embodiments, the materials of the first filter layer 1211 and the second filter layer 1212 are both glass fiber mesh composite materials.

[0100] In some embodiments, the outer layer of the mesh includes a water-absorbing filter layer 1231, a first fiberglass mesh filter layer 1232, a filter layer 1233, a second fiberglass mesh filter layer 1234, and a water-absorbing sock layer 1235 arranged radially from the inside to the outside, with the water droplet adsorption force of each filter layer gradually increasing from the inside to the outside.

[0101] In the embodiments of this application, each type of filter material in the outer layer has a different adsorption force on water droplets, with the adsorption force gradually increasing from the inside to the outside. This causes the water droplets to continuously combine, aggregate, and grow larger, while the water droplet flow rate gradually slows down. Each type of filter material in the outer layer can be arranged in 1-5 layers, and the overall thickness of the filter material can reach 20mm-30mm, thus achieving a demulsification and long-channel effect.

[0102] In some embodiments, the first and second fiberglass mesh filter layers are primarily made of composite glass fiber. The absorbent filter layer can be made of polypropylene fiber felt. The filtration filter layer can be made of polystyrene fiber filter mesh. The absorbent sock layer can be made of absorbent resin and is placed on the outermost layer.

[0103] In the embodiments of this application, the two types of filter media composited within the stainless steel mesh primarily rely on the different surface tensions of water and oil to create two separate flow rates through the filter media, allowing water in the emulsified oil to detach from the oil's protective layer. The five types of filter media composited outside the stainless steel mesh have a significant water absorption effect, slowing down the flow of small water particles detached from the oil and causing them to combine into larger droplets. Larger droplets accelerate settling. Theoretically, the settling velocity of a 1mm water droplet is 0.2857mm / s, while that of a 3mm droplet can reach 0.8573mm / s, representing a three-fold increase in settling velocity.

[0104] In some embodiments, the initial pressure resistance of the demulsifying filter element is less than 0.2 MPa.

[0105] The pressure resistance of the demulsified filter element is calculated as follows:

[0106] In the formula, P is the pressure resistance of a single layer of filter media, λ is the flow resistance coefficient, and in the embodiment of this application, the flow resistance coefficient of ultra-high viscosity index hydraulic oil is λ=50, v is the fluid velocity, d is the maximum pore size of the filter media, the accuracy of the first filter media layer is 10μm, and d=10μm.

[0107] In the embodiments of this application, v==0.0094m / s;

[0108] ;

[0109] Based on the pressure resistance of a single layer of filter media, and according to the arrangement of the filter media structure, the pressure resistance calculation results of the demulsified filter element are as follows: For the layered filter media structure filter element, the number of filter media layers required to meet the long channel requirement is 15 layers, and the pressure resistance is 221*15=3315Pa=0.03315Mpa, which is less than the initial pressure resistance of 0.2Mpa.

[0110] In the embodiments of this application, the stainless steel mesh of the stainless steel mesh composite glass fiber filter media is made of stainless steel. In some embodiments, 022Cr17Ni12Mo2 is used, which has advantages such as high hardness, high strength, and easy cleaning. It can filter impurities and demulsify, and is convenient for maintenance and replacement. In the embodiments of this application, the demulsification filter element is in the form of stainless steel mesh composite glass fiber filter media with a precision of 10µm. It has the characteristics of high strength, high hardness, wear resistance, corrosion resistance, uniform gaps, and good permeability. It also has oleophilic and hydrophobic properties and a long channel effect, which can break the oil-in-water emulsion phenomenon by 99.99%, providing sufficient preparation for the next step of oil-water separation.

[0111] Figure 9 This is a schematic diagram of the structure of the oil-water separator filter element in some embodiments. Figure 10This is a schematic diagram of the oil-water separation membrane structure in some embodiments. In some embodiments, the oil-water separation filter element is fixed to the second flange 2106 by a pressure plate 2105 and a second pressure plate 2107, and the second pressure plate 2107 and the second flange 2106 are connected by bolts and nuts. One end of the oil-water separation filter element has a second pull rod 2201. In some embodiments, the oil-water separation filter element includes an oil-water separation membrane 2202. In some embodiments, the oil-water separation membrane is a nano-graphene mesh membrane, and the contact angle of water on the surface of the nano-graphene mesh membrane is greater than 150°. In the embodiments of this application, the oil-water separation filter element is a three-dimensional porous nano-graphene oil-water separation filter element. The three-dimensional porous nano-graphene oil-water separation filter element is made of nanomaterials and has oleophilic properties. When hydraulic oil containing water passes through the nano-graphene mesh membrane with oil-water separation function, the hydraulic oil is adsorbed by the superoleophilic substance, allowing the oil molecules to exchange and pass through. Meanwhile, the free water contained in the hydraulic oil is repelled by the uneven structure of the superhydrophobic membrane, preventing more than 99.99% of the tiny free water droplets in the hydraulic oil from passing through and accumulating into larger water droplets, which are then separated by the specific gravity of the oil and water.

[0112] In the embodiments of this application, the preparation method of the nanographene mesh includes:

[0113] Preparation of suspension: Add polyacrylamide, polyacrylamide, graphene powder and polytetrafluoroethylene powder in a mass ratio of 8:62:10:20, and stir to disperse into a suspension;

[0114] The suspension is uniformly sprayed onto a stainless steel wire mesh, and the sprayed stainless steel wire mesh is cured at a temperature controlled at 300℃ to form a graphene coating with a thickness of 9-11μm.

[0115] Specifically, a suspension prepared according to the appropriate ratio is sprayed evenly onto a 200-mesh stainless steel wire mesh at close range using a spray gun under a uniform air pressure of 0.4 MPa, with each spray covering approximately 3 μm. The sprayed stainless steel wire mesh is then placed in a muffle furnace for curing at 300℃ for 10 minutes. This process is repeated three times to achieve a coating thickness of approximately 10 μm. The curing temperature is controlled at 300℃ ± 1℃, curing the material onto the stainless steel surface. This process requires specific techniques to ensure the integrity of the graphene is not compromised.

[0116] In the embodiments of this application, the suspension formulation is prepared by adding polyacrylamide, polyacrylamide pyrrolidone, graphene powder, and polytetrafluoroethylene powder in a mass ratio of 8:62:10:20. The suspension is dispersed using a magnetic stirrer. Inaccurate proportions will cause changes in the contact angle, preventing it from reaching 150°±1°, thus affecting the effectiveness of the separation mesh in blocking water droplets. In the embodiments of this application, a curing temperature of 300°C is used, which significantly affects the stability of the graphene coating. Compared to a curing temperature of 350°C, controlling the curing temperature at 300°C±1°C ensures the stability of the graphene coating and reduces power consumption, saving costs.

[0117] Specifically, in some embodiments, the preparation method of the nanographene mesh includes:

[0118] Take a 200-mesh stainless steel mesh, cut it by hand to a size of 500±1mm x 1000±1mm, with a diagonal tolerance of 1mm, and remove burrs and sharp corners.

[0119] In a single-layer glass reactor, at a volume ratio of 120:6:1.8, 14.4 kg of anhydrous ethanol (equivalent to 18.35 L of anhydrous ethanol), 917.4 ml of tetraethyl orthosilicate, and 275.2 ml of deionized water were added. 460 ml of ammonia water was pre-prepared at a volume ratio of approximately 3, with 400 ml added initially, followed by slow dropwise addition until the pH reached 10. The mixture was stirred and mixed for 1 hour using a constant-temperature water bath to prepare 20 L of silica sol.

[0120] Pour into a 50L container and repeat twice to make a total of 40L of silica sol.

[0121] Weigh 216g of polyacrylamide, 1674g of polypropylene pyrrolidone, 270g of graphene powder and 540g of polytetrafluoroethylene powder according to a mass ratio of 8:62:10:20, and weigh 17.3kg of deionized water. Place them sequentially into a single-layer glass reactor and stir at room temperature for 1 hour to prepare a dispersion. Pour the mixture into a 50L container and repeat the process twice to prepare a total of 40kg of graphene dispersion, i.e., graphene suspension.

[0122] Dissolve 200g of cetyltrimethylammonium bromide in 20L of water and set aside. Take 6 pieces of 200-mesh 316L stainless steel wire mesh, each measuring 0.5m × 1.0m.

[0123] Immerse the stainless steel wire mesh in a prepared hexadecyltrimethylammonium bromide aqueous solution and ultrasonically clean for 30 minutes. Rinse with deionized water at room temperature and air dry.

[0124] Using a spray gun under a uniform air pressure of 0.4 MPa, graphene suspension is uniformly sprayed at close range onto a 180-mesh stainless steel wire mesh, spraying both sides.

[0125] The coated stainless steel wire mesh is placed in a drying oven for curing at 300℃ for 10 minutes. The thickness of one coat on both sides is approximately 3±0.5μm.

[0126] Repeat the steps three times to achieve a coating thickness of 9 ± 1.5 μm.

[0127] The coated stainless steel wire mesh is then immersed in silica sol.

[0128] After 5 minutes, remove it and place it in a drying oven to dry at 150℃ for 2 hours. Repeat the steps three times.

[0129] PDMS is sprayed onto the surface of stainless steel wire mesh, and the modified stainless steel mesh is then calcined at high temperature.

[0130] At a temperature of 300℃ for 10 minutes, a protective layer is applied to prevent peeling, resulting in a stable and robust graphene oil-water separation network with a coating thickness of 10±1.5μm and an adhesion level of 0 to 1.

[0131] In some embodiments of this application, an oil-water separation membrane assembly based on a stainless steel mesh is also provided, the oil-water separation membrane assembly including a demulsifying membrane 1204 and an oil-water separation membrane 2202. In some embodiments, the demulsifying membrane is the demulsifying membrane of the demulsifying filter element in any of the above embodiments. In some embodiments, the oil-water separation membrane is the nano-graphene mesh membrane of the oil-water separation filter element in any of the above embodiments.

[0132] The demulsifying membrane comprises an inner mesh layer, a stainless steel mesh layer, and an outer mesh layer arranged sequentially along a first direction; the inner mesh layer comprises a first filter material layer and a second filter material layer arranged sequentially along the first direction, wherein the precision of the first filter material layer is less than that of the second filter material layer; the outer mesh layer comprises a water-absorbing filter material layer, a first fiberglass mesh filter material layer, a filtration filter material layer, a second fiberglass mesh filter material layer, and a water-absorbing sock layer arranged sequentially along the first direction, wherein the water droplet adsorption force of each filter material layer gradually increases from the inside to the outside;

[0133] refer to Figure 10 The oil-water separation membrane is a nano-graphene mesh membrane, comprising stainless steel mesh wires and a graphene coating cured on the surface of the stainless steel mesh wires. The contact angle of oil droplets on the surface of the nano-graphene mesh membrane is 0°, while the contact angle of water on the surface of the nano-graphene mesh membrane is greater than 150°. In the embodiments of this application, the contact angle of oil droplets on the surface of the nano-graphene mesh membrane can be in a superwetting state. The measured contact angle is 0±1.3°. It can be understood that oil droplets have extremely strong spreading ability on the surface of the nano-graphene mesh membrane, not only completely wetting (contact angle 0°), but also further "penetrating" into the pores or grooves of the nano-graphene mesh membrane due to the surface structure or external force.

[0134] In some embodiments, the precision of the first filter layer is no greater than 10 μm, and the precision of the second filter layer is no greater than 35 μm.

[0135] In some embodiments of this application, an oil-water separation and purification device is also provided. It is understood that the oil-water separation and purification device in this application embodiment can be any of the ultra-high viscosity index hydraulic oil-water separation and purification devices described in the above embodiments. The oil-water separation and purification device includes an oil-water separation membrane assembly based on a stainless steel mesh; the oil-water separation and purification device includes a demulsifying filter element cylinder and a separating filter element cylinder; the demulsifying filter element cylinder contains a plurality of demulsifying filter elements, each including a demulsifying membrane; the separating filter element cylinder contains a plurality of oil-water separation filter elements, each including an oil-water separation membrane.

[0136] In some embodiments of this application, the oil-water separation and purification device itself does not have a pressurization device.

[0137] In some embodiments of this application, the oil-water separation and purification device includes a connecting device, which includes a lower connecting pipe. The inner diameter of the lower connecting pipe is larger than the diameter of the oil inlet of the demulsifying filter element cylinder. It is understood that the lower connecting pipe is the second transverse connecting pipe in the connecting device 3000 in the above embodiments.

[0138] Figure 11 This is a schematic diagram of an oil-water separation and purification device in some embodiments. Figure 12 This is a schematic diagram of an oil-water separation and purification method in some embodiments. The oil-water separation and purification methods in some embodiments of this application are performed using the oil-water separation and purification apparatus described in any of the above embodiments. (Reference) Figure 3 In some embodiments, the oil-water separation and purification device also includes a junction box 9001, a water level switch 9002, a solenoid valve 9003, a flow switch 9004, a ball valve 9005, etc.

[0139] According to the oil-water separation and purification apparatus in some embodiments of this application, refer to Figure 12 In some embodiments of this application, a method for oil-water separation and purification is provided, the method comprising:

[0140] Hydraulic oil is delivered to the oil-water separation and purification device at a first flow rate, where the first flow rate is the flow rate of the hydraulic oil in the hydraulic oil pipeline.

[0141] The flow rate is reduced to a second flow rate after passing through the demulsifying filter element;

[0142] Hydraulic oil enters the separating filter cartridge from the demulsifying filter cartridge body, and the flow rate increases to a third flow rate.

[0143] The flow rate is reduced to a fourth flow rate after passing through the oil-water separation filter element, thus completing the oil-water separation and purification.

[0144] In embodiments of this application, the second flow velocity V2 is less than the first flow velocity V1, the third flow velocity V3 is greater than the second flow velocity V2, and the fourth flow velocity V4 is less than the third flow velocity V3. In some embodiments, the first flow velocity V1, the second flow velocity V2, the third flow velocity V3, and the fourth flow velocity V4 satisfy the following relationship: In the embodiments of this application, This can prevent oil from accumulating and clogging the oil-water separation and purification device, thus preventing excessive pressure differential. In some embodiments, In the embodiments of this application, the dimensions of the second transverse connecting pipe, the first transverse connecting pipe, the oil inlet, and the oil outlet, as well as the oil-water separation membrane assembly, are precisely calculated and set to ensure... .

[0145] In some embodiments, the first flow velocity is 0.015-0.016 m / s, the second flow velocity is 0.0023-0.0027 m / s, the third flow velocity is 0.0046-0.0054 m / s, and the fourth flow velocity is 0.0023-0.0027 m / s.

[0146] In some embodiments, the method includes: hydraulic oil being directly delivered within a hydraulic oil pipeline to the inlet of the demulsifying filter element cylinder. In the embodiments of this application, it can be understood that "directly delivered within a hydraulic oil pipeline to the inlet of the demulsifying filter element cylinder" means that the oil-water separation and purification device itself no longer has a booster pump, etc., and the hydraulic oil is directly delivered within the hydraulic oil pipeline to the inlet cavity of the demulsifying filter element cylinder, and then enters the demulsifying filter element.

[0147] In some embodiments, the viscosity index of the hydraulic oil is not less than 180. As described above, the oil-water separation and purification device of this application is an ultra-high viscosity index hydraulic oil oil-water separation and purification device.

[0148] In some embodiments, the method includes: preventing more than 99.99% of free water droplets from passing through the oil-water separation membrane, causing them to accumulate into larger droplets, and separating them by utilizing the fact that water is heavier than oil and sinks.

[0149] In the embodiments of this application, water-containing hydraulic oil is pumped from the hydraulic oil tank through the inlet into the demulsification filter element cylinder via the hydraulic system pump. Inside the demulsification filter element, the special structure of the filter material causes small water droplets in the emulsified oil (i.e., water-in-oil phenomenon) to detach from the oil and recombine into larger droplets. The hydraulic oil and water droplets flow out from the outside of the demulsification filter element and through a connecting device to the oil-water separation filter element in the separation filter element cylinder. Due to the oleophilic and hydrophobic properties of the three-dimensional porous graphene interface, 99.99% of the water droplets are blocked outside the oil-water separation filter element. The droplets recombine into even larger droplets and flow into the wastewater tank. When a certain water level is reached, the water level switch senses a high water level and sends a high water level indication signal to control the drain solenoid valve to open and discharge the sludge water. When the water level switch senses a low water level, the indication signal is disconnected, and the drain solenoid valve closes. The hydraulic oil flows from the outside of the oil-water separation filter element into the inside of the oil-water separation filter element and then flows back to the oil tank through the outlet.

[0150] The oil-water separation and purification device is equipped with a water level switch, a differential pressure switch, an oil level switch (high oil level switch and low oil level switch), a pressure gauge (first pressure gauge and second pressure gauge), and a flow switch. It automatically drains water when the water level is high, indicates the oil level when the oil level is high, and alarms are triggered when the hydraulic oil inlet and outlet pressure difference is high, when there is a drainage failure, when there is an oil leak, and when the oil level is low.

[0151] In some embodiments of this application, a hydraulic system is also provided, which includes the oil-water separation and purification device described in any of the above embodiments. It is understood that the oil-water separation and purification device is used for oil-water separation and purification of the hydraulic oil in the hydraulic system. The sludge from the hydraulic system enters the oil-water separation and purification device, and the purified oil is output. This allows for the recycling of the hydraulic oil.

[0152] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A hydraulic oil-water separation and purification device with ultra-high viscosity index, characterized in that, The oil-water separation and purification device includes: A demulsification device includes a vertically arranged demulsification filter cartridge body, the demulsification filter cartridge body includes a demulsification cylinder body and a first cylinder cover detachably connected to the demulsification cylinder body, and a plurality of demulsification filter elements are provided inside the demulsification filter cartridge body; An oil-water separation device includes a vertically arranged separation filter element cylinder, the separation filter element cylinder including a separation cylinder body and a second cylinder cover detachably connected to the separation cylinder body, and a plurality of oil-water separation filter elements are provided inside the separation filter element cylinder. The connecting device includes a first transverse connecting pipe and a second transverse connecting pipe, both of which are transversely arranged to connect the demulsifying filter element cylinder and the separating filter element cylinder. The first transverse connecting pipe is located above the second transverse connecting pipe. The first transverse connecting pipe is used to prevent air accumulation, and the second transverse connecting pipe is used for the flow of hydraulic oil between the demulsifying filter element cylinder and the separating filter element cylinder. The demulsifying filter element cylinder has an oil inlet at the center of its upper end, and the separating filter element cylinder has an oil outlet at the center of its upper end. The oil inlet is used to connect to the hydraulic oil tank, and the oil outlet is used to connect to the hydraulic oil tank. The first cylinder cover and the demulsifying cylinder body have an oil inlet cavity, which is connected to the oil inlet and the demulsifying filter element respectively; There is an oil outlet cavity between the second cylinder cover and the separator cylinder body, and the oil outlet cavity is connected to the oil outlet and the oil-water separator filter element respectively; The first cylinder cover is also provided with a first exhaust port, and the second cylinder cover is also provided with a second exhaust port. Both the first exhaust port and the second exhaust port are provided with exhaust valves. The first exhaust port and the second exhaust port are respectively used to discharge the air in the demulsifying filter cylinder and the separating filter cylinder. The first exhaust port is connected to the oil inlet cavity, and the second exhaust port is connected to the oil outlet cavity.

2. The oil-water separation and purification device according to claim 1, characterized in that, The inner diameter of the first transverse connecting pipe is smaller than the inner diameter of the second transverse connecting pipe.

3. The oil-water separation and purification device according to claim 1, characterized in that, The separator filter cartridge body is provided with 3 oil-water separator filter elements, which are arranged vertically. The demulsifying filter cartridge contains four demulsifying filter cartridges, which are arranged vertically.

4. The oil-water separation and purification device according to claim 1, characterized in that, The demulsifying filter element can be removed and replaced from the upper part of the demulsifying filter element cylinder, and the oil-water separating filter element can be removed and replaced from the upper part of the separating filter element cylinder.

5. The oil-water separation and purification device according to any one of claims 1-4, characterized in that, The oil-water separation and purification device includes a differential pressure monitoring module, which includes a first pipeline, a second pipeline, and a differential pressure switch. The differential pressure switch is installed on the side wall of the separator cylinder. One end of the first pipe is connected to the differential pressure switch, and the other end extends upward through the demulsifying cylinder into the oil inlet cavity. One end of the second pipe is connected to the differential pressure switch, and the other end extends upward through the separator cylinder into the oil outlet cavity.

6. The oil-water separation and purification device according to claim 5, characterized in that, At least one of the first pipe and the second pipe passes through the first transverse connecting pipe and enters the demulsifying filter cartridge body from the connection point between the first transverse connecting pipe and the demulsifying filter cartridge body, or enters the separating filter cartridge body from the connection point between the first transverse connecting pipe and the separating filter cartridge body.

7. The oil-water separation and purification device according to claim 4, characterized in that, The oil-water separation and purification device also includes a high oil level switch and a low oil level switch; the high oil level switch is located on the second cylinder cover and is connected to the inside of the separation filter cylinder. The low oil level switch is located at the bottom of the demulsifying filter cartridge.

8. The oil-water separation and purification device according to claim 1, characterized in that, The demulsifying filter element includes an inner mesh layer, a stainless steel mesh layer, and an outer mesh layer arranged radially from the inside out. The inner layer of the mesh includes a first filter material layer and a second filter material layer arranged radially from the inside to the outside. The precision of the first filter material layer is less than that of the second filter material layer. The outer layer of the mesh includes a water-absorbing filter material layer, a first fiberglass mesh filter material layer, a filter material layer, a second fiberglass mesh filter material layer, and a water-absorbing sock layer arranged radially from the inside to the outside. The water droplet adsorption force of each filter material layer gradually increases from the inside to the outside. The oil-water separator filter element includes a nano-graphene mesh membrane, and the contact angle of water on the surface of the nano-graphene mesh membrane is greater than 150°.

9. The oil-water separation and purification device according to any one of claims 1-4 and 6-8, characterized in that, The oil-water separation and purification device itself does not have a pressurization device; Hydraulic oil is supplied to the inlet at a first flow rate, which is the flow rate of the hydraulic oil in the hydraulic oil pipeline. The flow rate of the hydraulic oil decreases to a second flow rate after passing through the demulsifying filter element. The flow rate of the hydraulic oil increases to a third flow rate as it enters the separating filter element from the demulsifying filter element cylinder. The flow rate of the hydraulic oil decreases to a fourth flow rate after passing through the oil-water separating filter element. The first flow rate, the second flow rate, the third flow rate, and the fourth flow rate satisfy the relationship: first flow rate > third flow rate > fourth flow rate ≥ second flow rate.

10. A hydraulic system, characterized in that, The hydraulic system includes the oil-water separation and purification device according to any one of claims 1-9.

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