Liquid height control type hollow impeller oil-water separation device

Abstract

The utility model discloses a liquid height control type hollow impeller oil-water separation device, and relates to the technical field of sewage cleaning equipment. The lower end of the left side wall of the oil-water separation box is connected with a plurality of water inlet pipes through bolts, an outlet of the water suction pump body is in sealed connection with the water inlet pipes, the inner left side wall of the oil-water separation box is connected with a separation guide plate, the separation guide plate divides the interior of the oil-water separation box into a treatment bin and a separation bin, and the water inlet pipes are communicated with the treatment bin. An electromagnetic valve is mounted in a bottom mounting hole of the separation guide plate, a liquid level sensor is fixedly mounted on the left inner side wall of the oil-water separation tank, a hollow impeller mechanism is fixedly mounted at the upper end of the treatment bin through bolts, and an electric oil scraping mechanism is fixedly mounted in the middle of the top of the oil-water separation tank; according to the utility model, oil and water are in full contact with a coagulant and a flocculating agent to form suspended matter floccules, so that the suspended matter floccules float upwards, the oil and water are convenient to separate, and meanwhile, the liquid level is controlled by adopting the matching of the electromagnetic valve and the liquid level sensor.

Description

Technical Field

[0001] This utility model belongs to the technical field of sewage cleaning equipment, specifically relating to a liquid-controlled hollow impeller oil-water separation device. Background Technology

[0002] Oil-water separators are used to remove suspended solids, oil, and other pollutants from water. Their core principle is to achieve solid-liquid separation by utilizing the thorough mixing of gas and the rising of air bubbles in the liquid. my country has implemented large-scale applications of hollow impeller oil-water separators in urban sewage treatment and industrial wastewater treatment. However, existing hollow impeller oil-water separators suffer from the following problems during use:

[0003] I. Currently, most oil-water separators on the market are large-scale hollow impellers. They can only be fixed in one place during use, which is inconvenient to disassemble and move. At the same time, they are inconvenient to disassemble and reassemble when a malfunction occurs, which wastes maintenance time. In addition, the cost of use is high and their applicable range is small.

[0004] Second, some small hollow impeller oil-water separators cannot control the inlet water level during use, resulting in incomplete oil-water separation. Some oil blocks, stains, and other floating matter cannot fully contact the coagulant and flocculant. After the oil blocks, stains, and other floating matter settle to the bottom, they are discharged with the water, which does not meet the discharge standards.

[0005] Third, small hollow impeller oil-water separators experience greater resistance when scraping off the scum on the upper side, resulting in high energy consumption and a high maintenance rate during operation. Utility Model Content

[0006] To address the problems mentioned in the background section, the purpose of this invention is to provide a controlled-fluid-height hollow impeller oil-water separation device.

[0007] This utility model discloses a liquid-controlled height-type hollow impeller oil-water separation device, comprising an oil-water separation tank, a pump body, a hollow impeller mechanism, an electric oil scraping mechanism, a dividing guide plate, a solenoid valve, a liquid level sensor, a dividing L-shaped plate, and an oil collecting baffle body. Several water inlet pipes are bolted to the lower end of the left side wall of the oil-water separation tank, and the outlet of the pump body is sealed to these water inlet pipes. A dividing guide plate is connected to the inner left side wall of the oil-water separation tank, dividing the interior of the tank into a processing chamber and a separation chamber. The water inlet pipes are connected to the processing chamber. A separation gap is provided between the upper end of the dividing guide plate and the oil-water separation tank, connecting the processing chamber and the separation chamber. The oil-water separator has a solenoid valve installed in the bottom mounting hole of the separation guide plate. A liquid level sensor is fixedly installed on the left inner side wall of the oil-water separator. A hollow impeller mechanism is fixedly installed at the top of the processing chamber by bolts. An electric oil scraping mechanism is fixedly installed in the top middle of the oil-water separator. An L-shaped separating plate is fixedly installed inside the separation chamber. The bottom of the L-shaped separating plate is a drainage chamber. The solenoid valve is connected to the drainage chamber. A drain pipe is connected to the right side wall of the oil-water separator. The drain pipe is connected to the drainage chamber. An oil collecting baffle is fixedly installed on the inner side wall of the L-shaped separating plate. The inner side of the oil collecting baffle is an oil collecting chamber. The oil collecting chamber is connected to the oil drain pipe connected to the front of the oil-water separator.

[0008] As a preferred embodiment: the water pump body is a three-cylinder pump, the water pump body is provided with three water inlets, and a suction pipe is fixedly installed on the water inlet.

[0009] As a preferred embodiment: the hollow impeller mechanism includes a mounting plate and a hollow impeller; the mounting plate has a mounting hole in the middle, and the hollow impeller is mounted on the mounting hole of the mounting plate by bolts.

[0010] As a preferred embodiment: the electric oil scraping mechanism includes a drive shaft, a driven shaft, sprockets, a chain, scraper blades, a shaft mounting base, a drive motor, pulleys, and a belt; the two ends of the drive shaft and the driven shaft are respectively mounted in the mounting holes of the shaft mounting base through bearings, and the shaft mounting base is mounted on the oil-water separator by bolts; sprockets are fixedly mounted on both sides of the drive shaft and the driven shaft, and chains are wound around the left and right sprockets; several scraper blades are mounted obliquely on the chains; pulleys are fixedly mounted on one end of the drive shaft and on the shaft of the drive motor, and the two pulleys are connected by a belt; the drive motor is fixedly mounted on the top of the oil-water separator.

[0011] As a preferred embodiment, the tilt angle of the scraper blade is in the range of 10 to 25°.

[0012] As a preferred embodiment: the end of the scraper is provided with a bent body, and the top of the scraper is welded with two sets of fixing ears. Each set of fixing ears includes two single ear pieces arranged side by side, and each single ear piece is machined with fixing holes along its thickness direction.

[0013] As a preferred embodiment, the partition guide plate is tilted to the right.

[0014] As a preferred embodiment, the oil collecting baffle is an L-shaped plate, and an oil inlet gap is provided between the upper end of the oil collecting baffle and the oil-water separator.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model achieves full contact between oil and water and coagulant and flocculant by the cooperation of an oil-water separation tank, a water pump body, a hollow impeller mechanism, an electric oil scraping mechanism, a separating guide plate, a solenoid valve, a liquid level sensor, a separating L-shaped plate, and an oil collecting baffle body, forming suspended flocs. These flocs float to the surface, facilitating oil-water separation. Simultaneously, the use of a solenoid valve and a liquid level sensor controls the liquid level, allowing for precise control of the inlet water level during use, thus ensuring a thorough oil-water separation process. Furthermore, it provides favorable conditions for some oil lumps, stains, and other floating debris to fully contact the coagulant and flocculant. The specific advantages of this utility model are:

[0016] I. This utility model generates a large number of microbubbles in the treatment chamber through the rotation of the hollow impeller blades of the hollow impeller mechanism. Under the combined action of coagulant and flocculant, large suspended flocs are formed. Under the buoyancy of the bubble group, the flocs float to the liquid surface to form scum, which is not easy to sink to the bottom. It has high reliability and good oil floating efficiency.

[0017] Second, this utility model uses an electric oil scraping mechanism to scrape off the scum on the water surface and scrape it into the oil collection tank. Finally, the scum is discharged through the oil drain pipe. The oil-water separator can be moved, disassembled, and disassembled. Under different working conditions, it can still achieve the advantages of high efficiency, convenience, simple operation, and stable separation.

[0018] Third, this utility model uses a liquid level sensor to detect the liquid level height, and the sinking water is drained from the bottom by opening and closing a solenoid valve. It can accurately control the liquid level height and adjust the liquid level height according to different situations, as well as the oil scraper to scrape and transport oil. It integrates the functions of cleaning and conveying, and also has the characteristics of low vibration and stable and reliable operation.

[0019] Fourth, the equipment of this utility model is small in size and relatively flexible in operation, and is especially suitable for cleaning sewage in special terrain. Attached Figure Description

[0020] For ease of explanation, the present invention will be described in detail below with reference to specific embodiments and accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 for Figure 1 Top view;

[0023] Figure 3 for Figure 2 Sectional view along axis AA;

[0024] Figure 4 This is a perspective view of the present utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the hollow impeller removal mechanism in this utility model;

[0026] Figure 6 This is a schematic diagram of the oil scraper in this utility model;

[0027] Figure 7 This is a front view of the scraper blade in this utility model;

[0028] Figure 8 This is a schematic diagram of the working state of the scraper blade in this utility model;

[0029] Figure 9 This is a diagram showing the relationship between the tilt angle of the scraper blade, resistance, and depth of penetration into the liquid in this invention.

[0030] Figure 10 This is a schematic diagram of the hollow impeller blades of the hollow impeller machine of this utility model;

[0031] Figure 11 This is a schematic diagram of the drive shaft in this utility model;

[0032] Figure 12 This is a schematic diagram of the driven shaft in this utility model.

[0033] In the diagram: 1-Oil-water separator; 2-Water pump body; 3-Hollow impeller mechanism; 4-Electric oil scraping mechanism; 5-Separation guide plate; 6-Solenoid valve; 7-Liquid level sensor; 8-Separation L-shaped plate; 9-Oil collection baffle body;

[0034] 1-1-Water inlet pipe; 1-2-Drain pipe; 1-3-Oil drain pipe; 1-4-Processing chamber; 1-5-Separation chamber; 1-6-Oil collection chamber; 1-7-Drainage chamber; 1-8-Separation gap;

[0035] 2-1-Suction pipe;

[0036] 3-1-Mounting plate; 3-2-Hollow impeller;

[0037] 4-1-Drive shaft; 4-2-Driven shaft; 4-3-Sprocket; 4-4-Chain; 4-5-Oil scraper; 4-6-Shaft mounting base; 4-7-Drive motor; 4-8-Pulley; 4-9-Belt;

[0038] 4-51-Bent body; 4-52-Fixing lug;

[0039] 9-1-Oil inlet gap. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. The structures, proportions, sizes, etc., illustrated in the accompanying drawings are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives achieved by this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0041] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the solution according to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0042] Specific implementation method one: Combining Figures 1 to 12 The illustration shows this specific embodiment, which uses a hollow impeller mechanism 3 to achieve the rotation of the hollow impeller blades, generating a large number of microbubbles within the processing chambers 1-4. The specific technical solution includes an oil-water separator 1, a pump body 2, a hollow impeller mechanism 3, and a partition guide plate 5. Several water inlet pipes 1-1 are bolted to the lower end of the left side wall of the oil-water separator 1. The outlet of the pump body 2 is sealed to the several water inlet pipes 1-1, allowing the pump body 2 to draw water from the inlet pipes 1-1 into the oil-water separator 1. A partition guide plate 5 is connected to the inner left side wall of the oil-water separator 1, dividing the interior of the oil-water separator 1 into processing chambers. The treatment chamber 1-4 and the separation chamber 1-5 are connected. The treatment chamber 1-4 can achieve full contact between oil and water and coagulant and flocculant. The water inlet pipe 1-1 is connected to the treatment chamber 1-4. The upper end of the separation guide plate 5 is provided with a separation gap 1-8 between the oil and water separation box 1 and the separation gap 1-8. The treatment chamber 1-4 and the separation chamber 1-5 are connected by bolts. The upper end of the treatment chamber 1-4 is fixed with a hollow impeller mechanism 3. The hollow impeller blades of the hollow impeller mechanism 3 can achieve high-speed rotation, generating a large number of microbubbles in the treatment chamber 1-4. Under the combined action of coagulant and flocculant, large suspended flocs are formed. Under the buoyancy of the bubble group, the "flocs" float to the liquid surface to form scum.

[0043] Combination Figures 1 to 12 The following describes a specific embodiment. In this embodiment, an electric oil scraping mechanism 4 is used to separate oil foam from liquid. The specific technical solution is as follows: it includes an electric oil scraping mechanism 4, a dividing L-shaped plate 8, and an oil collecting baffle body 9. The electric oil scraping mechanism 4 is fixedly installed at the top center of the oil-water separator 1. The dividing L-shaped plate 8 is fixedly installed inside the separation chamber 1-5. The bottom of the dividing L-shaped plate 8 is a drainage chamber 1-7, which can drain water. A drainage pipe 1-2 is connected to the right side wall of the oil-water separator 1. The drainage pipe 1-2 is connected to the drainage chamber 1-7 and can drain water. An oil collecting baffle body 9 is fixedly installed on the inner side wall of the dividing L-shaped plate 8. The inner side of the oil collecting baffle body 9 is an oil collecting chamber 1-6. The oil collecting chamber 1-6 is connected to the oil drain pipe 1-3 connected to the front side of the oil-water separator 1. The electric oil scraping mechanism 4 can scrape oil foam and other impurities into the oil collecting chamber 1-6 and finally discharge them through the oil drain pipe 1-3.

[0044] Combination Figures 1 to 12 The following describes a specific embodiment. In this embodiment, the liquid level is controlled by the cooperation of a solenoid valve 6 and a liquid level sensor 7. The specific technical solution is as follows: a solenoid valve 6 and a liquid level sensor 7 are included; a solenoid valve 6 is installed in the bottom mounting hole of the partition guide plate 5; a liquid level sensor 7 is fixedly installed on the left inner side wall of the oil-water separator 1; the solenoid valve 6 is connected to the drainage chamber 1-7; the liquid level is monitored by the liquid level sensor 7; when the liquid level is too high, the solenoid valve 6 is opened to drain the water.

[0045] In this specific embodiment, the contaminated oil and water are pumped into the treatment chamber 1-4 inside the oil-water separator 1 by the pump body 2. At this time, the hollow impeller mechanism 3 is activated. The rotation of the hollow impeller blades of the hollow impeller mechanism 3 generates a large number of microbubbles in the treatment chamber 1-4. Under the combined action of coagulant and flocculant, large suspended flocs are formed. Under the buoyancy of the bubble group, the flocs float to the surface of the liquid and form scum. At the same time, the liquid level sensor 7 is used to monitor the liquid level. When the liquid level is too high, the solenoid valve 6 is opened, and water enters the separation chamber 1-5 from the solenoid valve 6. Finally, it is discharged from the drain pipe 1-2 through the drain chamber 1-7. The electric oil scraping mechanism 4 scrapes the suspended flocs on the water side into the oil collection chamber 1-6 and discharges them through the oil drain pipe 1-3.

[0046] This specific embodiment separates the contaminated oil from the water, causing the contaminated oil clumps in the water to float to the surface and removing the primary oil clumps and the oil film on the water surface. The hollow impeller generates a large number of bubbles, causing the fine oil particles that have settled at the bottom of the water and dissolved in the water to float to the surface. The oil scraper 4-5 of the electric oil scraper mechanism 4 removes the bubbles carrying dirt and oil stains from the surface. The sinking water is discharged from the bottom by controlling the opening and closing of the solenoid valve 6, and the liquid level can be precisely controlled.

[0047] Specific Implementation Method Two: Combining Figure 1 The following is an illustration of this specific embodiment, which is a further limitation of the first specific embodiment. In this specific embodiment, the water pump body 2 can pump oil and water into the oil-water separator 1. The specific technical solution adopted is as follows: the water pump body 2 is a three-cylinder pump with three water inlets. A suction pipe 2-1 is fixedly installed on the water inlet. The three-cylinder pump is used to achieve rapid water pumping, so that oil and water can quickly enter the oil-water separator 1.

[0048] Specific implementation method three: Combining Figure 3 The illustration shows this specific embodiment, which is a further limitation of embodiment one or two. In this specific embodiment, the oil collecting chamber 1-6 is separated by the oil collecting baffle body 9 to facilitate the discharge of floating oil foam and other impurities. The specific technical solution adopted is as follows: The oil collecting baffle body 9 is an L-shaped plate. The upper end of the oil collecting baffle body 9 and the oil-water separation tank 1 are provided with an oil inlet gap 9-1. The oil inlet gap 9-1 can allow the floating oil foam and other floating liquids to enter the oil collecting chamber 1-6.

[0049] Specific implementation method four: Combination Figure 4 The illustration shows this specific embodiment, which is a further limitation of embodiment one, two, or three. This embodiment uses a hollow impeller mechanism 3 to generate a large number of microbubbles in the treatment chamber 1-4. Under the combined action of coagulant and flocculant, large suspended flocs are formed. The flocs float to the liquid surface under the buoyancy of the bubble cluster, forming scum. Specifically, the technical solution is as follows: The hollow impeller mechanism 3 includes a mounting plate 3-1 and a hollow impeller 3-2. A mounting hole is provided in the middle of the mounting plate 3-1. The hollow impeller 3-2 is bolted to the mounting hole of the mounting plate 3-1. The mounting plate 3-1 can be quickly installed on the upper end of the oil-water separator 1. Simultaneously, the hollow impeller blades of the hollow impeller 3-2 can rotate at high speed. The structure of the hollow impeller blades is as follows... Figure 10 As shown.

[0050] In this specific embodiment, the hollow impeller blades are hollow impeller blades with a radius of 200 mm, as detailed below:

[0051] To accommodate the rotational motion of the hollow shaft, a hollow impeller fan blade with a radius of 200 mm is used, divided into three branches. Each air outlet has an area of ​​3.43 square centimeters and a single output volume of 68.6 ml. Specific rotational speed and design dimensions are as follows:

[0052] The hollow impeller blades are located approximately 745 mm below the liquid surface, where the liquid pressure is:

[0053] F = 3 × ρghs

[0054] In the above formula, ρ represents the liquid density, and ρ = 10. 3 kg / m 2 ;

[0055] g ~ gravity coefficient, g = 9.8;

[0056] h ~ liquid depth, h = 745 mm;

[0057] s ~ area under pressure, ρ = 10 3 kg / m 2 ;

[0058] s=l×h=0.49×0.07=0.0343m 2

[0059] F1 = 3 × ρghs = 7.5429 N

[0060] The centrifugal force analysis during the rotation of the hollow impeller is as follows:

[0061] F2 = mw 2 r

[0062] In the above formula, m represents the area swept by the hollow impeller and the mass of the liquid: m = ρv;

[0063] w ~ angular velocity of the hollow impeller, w = 500 r / min;

[0064] r ~ radius of the hollow impeller

[0065] That is: F1 = 3 × ρghs = 7.5429 N <F2=mw 2 r

[0066] r = 3 × ρghs / mw 2 =0.12m

[0067] Based on this analysis, hollow impeller blades with a radius greater than 120 mm are required to generate dense bubbles at a rotation speed of 500 rpm. Therefore, choosing hollow impeller blades with a radius of 200 mm can generate dense bubbles more efficiently.

[0068] Specific Implementation Method Five: Combining Figures 1 to 4This embodiment illustrates a further limitation of embodiments one, two, three, or four. This embodiment uses an electric oil scraping mechanism 4 to separate floating oil scum and other floating debris. The specific technical solution is as follows: The electric oil scraping mechanism 4 includes a drive shaft 4-1, a driven shaft 4-2, a sprocket 4-3, a chain 4-4, oil scraping plates 4-5, a shaft mounting base 4-6, a drive motor 4-7, a pulley 4-8, and a belt 4-9. The two ends of the drive shaft 4-1 and driven shaft 4-2 are respectively mounted in the mounting holes of the shaft mounting base 4-6 via bearings. The shaft mounting base 4-6 enables the installation of the drive shaft 4-1 and driven shaft 4-2. The shaft mounting base 4-6 is bolted to the oil-water separator 1. Sprockets 4-3 are fixedly mounted on both sides of the drive shaft 4-1 and driven shaft 4-2, and chains 4-4 are wound around both sprockets 4-3. Several oil scraping plates 4-5 are installed at an angle. On chain 4-4, pulleys 4-8 are fixedly mounted on one end of the drive shaft 4-1 and on the shaft of the drive motor 4-7. The two pulleys 4-8 are connected by a belt 4-9. The drive motor 4-7 is fixedly mounted on the top of the oil-water separator 1. The drive motor 4-7 drives the drive shaft 4-1 to rotate via the belt 4-9. The drive shaft 4-1 drives the driven shaft 4-2 to rotate and the oil scraper 4-5 on the chain 4-4 to rotate via chain 4-4. To achieve oil-water separation; the end of the scraper 4-5 is provided with a bending body 4-51, which facilitates quick entry into the oil foam. The top of the scraper 4-5 is welded with two sets of fixing ears 4-52. Each set of fixing ears 4-52 includes two parallel single ear pieces. Each single ear piece has a fixing hole processed along its thickness direction. The fixing ears 4-52 can be quickly fixed and installed on the chain 4-4.

[0069] In this embodiment, the tilt angle of the scraper 4-5 is in the range of 10 to 25°, that is, the scraper 4-5 is used in a tilted state, and the angle formed between the surface of the scraper 4-5 and the horizontal plane is 10 to 25°, that is, the included angle between the surface of the scraper 4-5 and the top surface of the oil-water separator 1 is 10 to 25°.

[0070] In this specific embodiment, the main parameters of chain 4-4 and sprocket 4-3 are determined as follows:

[0071] Chain 4-4 uses an existing roller chain, which consists of an inner chain plate, an outer chain plate, a pin, a bushing, and rollers;

[0072] Since P is the average traction resistance, P = 57.58 N; a 20A chain is selected.

[0073] P1 ~ pitch, P1 = 31.57 mm;

[0074] Pt ~ row spacing, Pt = 35.76 mm;

[0075] Q ~ ultimate tensile load, Q = 87000 N;

[0076] q ~ mass per unit length q=3.80kg / m;

[0077] Design two identical chains, each chain consisting of 40 units.

[0078] Design two pairs of 1:1 sprockets:

[0079] Pitch circle diameter:

[0080]

[0081] In the above formula, P1 represents the pitch, P1 = 31.57 mm; z represents the number of teeth, z = 20;

[0082] Tooth tip circle diameter:

[0083] d a max =d + 1.25p - d1 = 410mm

[0084]

[0085] Tooth root circle diameter: d f =d-d1=368.12mm

[0086] The main parameters of the oil scraper 4-5 in this specific embodiment are as follows:

[0087] like Figure 7 , Figure 8 As shown, the main parameters of the oil scraper include the water entry angle α, scraper length L, scraper contact surface angle γ, scraping surface width B, and scraper rear end height h. The specific analysis and calculation process is as follows:

[0088] (1) Angle of entry into water α:

[0089] When the scraper blade's water entry angle is too large, the scraping depth is insufficient, resulting in poor scraping performance. Due to gravity, when using a heavier scraper blade, the water entry angle is smaller, but this increases the weight the chain must bear, affecting overall performance and also increasing the required motor power. During machine operation, it is necessary to adjust the appropriate scraping angle and water entry angle to improve scraping efficiency. Between oil and water separation, a liquid level sensor can be used to control the liquid level, achieving efficient oil removal by the scraper blade. The scraper blade design must meet the weight the chain can bear and the resistance the motor can handle, achieving the desired scraping effect while minimizing the scraper blade's weight. The water entry angle should meet the scraping effect to a certain extent but not be too large. The scraper blade's working state is as follows... Figure 8As shown.

[0090] Using d'Alembert's principle, for oil droplets to move backward, the following must be satisfied:

[0091]

[0092] In the above formula: P - the force required to propel the liquid along the scraper;

[0093] R - The reaction force of the slanted scraper at the lower end of the scraper on the liquid;

[0094] The friction between the T-shovel surface and the liquid;

[0095] G - The gravity of the liquid being propelled;

[0096] α - Installation tilt angle of the scraper blade;

[0097] μ - the resistance coefficient of oil foam to the scraper, μ = tgφ, where φ is the angle between the oil foam surface and the scraper surface.

[0098] Simplifying, we get: P≥Gtan(α+μ);

[0099] The above equation shows that the oil spray resistance P is a tangent function of the scraper blade installation angle α. The influence of the scraper blade installation angle on the resistance P when operating in oils of different concentrations is as follows: Figure 9 As shown in the curve. When φ is small, the curve changes gently. As φ increases, the curve becomes steeper, indicating that the change in the installation angle of the scraper blade leads to the change in oil resistance. When the installation angle α of the scraper blade is small, the oil resistance P increases slowly with α. When α ≥ 25°, the traction resistance increases sharply. Therefore, the water entry angle should preferably be α ≤ 25°.

[0100] (2) Scraper height H:

[0101] The height H of the oil scraper is divided into H1 and H2. H1 is the length of the part submerged in the liquid, and H2 is the length of the part exposed above the liquid surface.

[0102] The height of the liquid level is from Figure 8 We can obtain:

[0103] The oil scraper typically scrapes oil to a depth of about 50mm below the liquid surface. Taking the height of the oil scraper H = 60mm, the change of H1 with α is as follows: Figure 9 As shown in the curve, the length H1 of the liquid-immersed portion decreases as α increases. When α is a small value, H1 will be longer, resulting in poor liquid-immersed performance and a non-compact structure. Generally, α is taken as >15°, and here α is taken as 20°. From the formula, H1 = 46 mm.

[0104] In this specific embodiment, the verification of the driving shaft and driven shaft is as follows:

[0105] In practical operation, both the driving and driven shafts bear various loads. Calculations are crucial to ensuring the shafts can withstand these loads and operate reliably. Depending on the shaft's failure mode, calculations typically include strength calculations, stiffness calculations, and critical speed calculations. The driving and driven shafts are as follows... Figure 11 , Figure 12 As shown; considering the requirements for shaft rigidity, strength, and wear resistance, as well as material cost, 45 steel was selected and heat-treated to achieve HBS of 217-255. The shaft diameter was determined according to the mechanical design manual, and the shaft diameter is 40mm. The keyway on the shaft is used to connect the sprocket. The strength calculation is performed below.

[0106] For a cam with a concentrated load acting on its shaft, based on the forces acting on it, we can deduce:

[0107] (1) Magnitude of the force acting on the drive shaft:

[0108] Torque:

[0109] T = 95.5 × 10 5 ×P / n=95.5×10 5 ×8.1 / 1450=53348(N·mm)

[0110] Circular force:

[0111] F t =2T / d1=2×53348 / 59.88=1782(N)

[0112] Radial force:

[0113] F r =F t ·cos30°=1782×0.866=1543(N)

[0114] Axial force:

[0115] F a =0(N)

[0116] (2) Determine the support reaction force and bending moment of the main section of the bearing:

[0117]

[0118] The bending moment at the section is:

[0119] M CV左 =F BV ×50=992×50=49600(N·mm)

[0120] M CV右 =F DV ×90=(F r -FBV )×90=(1543-992)×90=49590(N·mm)

[0121] (3) Determine the support reaction force of the bearing on the horizontal plane and the bending moment of the main section:

[0122]

[0123] F DH =F t -F BH =1782-1145=637(N)

[0124] The bending moment at the section is:

[0125] M CH =F BH ×50=1145×50=57250(N·mm)

[0126] (4) The combined bending moment in the vertical and horizontal planes at the cross-section:

[0127]

[0128] (5) Check the strength of the shaft according to the combined stress of bending moment:

[0129] When performing the verification, the strength of the section on the shaft subjected to the maximum bending moment and torque is usually verified only. Taking α = 0.6, the stress is calculated as follows:

[0130]

[0131] From the table, we get [σ] -1 ] = 60MPa, due to σ v <[σ -1 Therefore, it is safe.

[0132] Selection and life calculation of bearing housings:

[0133] Bearing housing selection: Choose a deep groove ball bearing, model 6207, because it mainly bears radial loads, has the lowest equivalent coefficient of friction, and is the cheapest.

[0134] Bearing housing life calculation:

[0135] The basic dynamic load rating C of bearing 6207 can be found in the design manual. r = 30500N, basic rated static load C 0r =20000N; the specific calculation is as follows:

[0136] (1) Calculate the internal axial load of the two bearings:

[0137] F s1 =0.5FR1 =0.5 × 1543 = 771.5 N

[0138] F s2 =0.5F R2 =0.5 × 1140 = 570 N

[0139] (2) Calculate the axial load on the two bearings:

[0140] Left end bearing Take the maximum value F from the two A1 =1131.5N

[0141] Right end bearing Take the maximum value F from the two A2 =570N

[0142] (3) Calculate the equivalent dynamic load of the two bearings:

[0143] The load is stable, and the load factor f is found. p =1.1;

[0144]

[0145] P1 = f p (X1F R1 +Y1F A1 )=1.1×(0.56×1543+1.71×1140)=3094N;

[0146] Similarly, we can conclude that P2 = 2207N.

[0147] (4) Calculate bearing life:

[0148] For operating temperatures below 120 degrees Celsius, refer to the temperature coefficient f. t =1;

[0149] Left end bearing

[0150] Right end bearing

[0151] Based on the above calculations, it can be concluded that the left-end bearing is more prone to failure than the right-end bearing and should be replaced after 5482 hours, or 7.6 months of operation, while the right-end bearing only needs to be replaced once every three years.

[0152] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

[0153] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A controlled-liquid-height hollow impeller oil-water separator, characterized in that: The system includes an oil-water separator (1), a water pump body (2), a hollow impeller mechanism (3), an electric oil scraping mechanism (4), a partition guide plate (5), a solenoid valve (6), a liquid level sensor (7), a partition L-shaped plate (8), and an oil collection baffle body (9). Several water inlet pipes (1-1) are bolted to the lower end of the left side wall of the oil-water separator (1). The outlet of the water pump body (2) is sealed to the several water inlet pipes (1-1). A partition guide plate (5) is connected to the inner left side wall of the oil-water separator (1). The partition guide plate (5) divides the interior of the oil-water separator (1) into a processing chamber (1-4) and a separation chamber (1-5). The water inlet pipe (1-1) is connected to the processing chamber (1-4). A separation gap (1-8) is provided between the upper end of the partition guide plate (5) and the oil-water separator (1). The separation gap (1-8) connects the processing chamber (1-4) and the separation chamber (1-5). A solenoid valve (6) is installed in the bottom mounting hole of (5). A liquid level sensor (7) is fixedly installed on the left inner side wall of the oil-water separator (1). A hollow impeller mechanism (3) is fixedly installed at the upper end of the processing chamber (1-4) by bolts. An electric oil scraping mechanism (4) is fixedly installed in the middle of the top of the oil-water separator (1). A dividing L-shaped plate (8) is fixedly installed inside the separation chamber (1-5). The bottom of the dividing L-shaped plate (8) is the drainage chamber (1-7). The solenoid valve (6) is connected to the drain chamber (1-7). The drain pipe (1-2) is connected to the right side wall of the oil-water separator (1). The drain pipe (1-2) is connected to the drain chamber (1-7). An oil collecting baffle (9) is fixedly installed on the inner side wall of the L-shaped partition plate (8). The inner side of the oil collecting baffle (9) is the oil collecting chamber (1-6). The oil collecting chamber (1-6) is connected to the oil drain pipe (1-3) connected to the front side of the oil-water separator (1).

2. The controlled-fluid-height hollow impeller oil-water separator according to claim 1, characterized in that: The pump body (2) is a three-cylinder pump with three water inlets and a suction pipe (2-1) fixedly installed on the water inlets.

3. The controlled-fluid-height hollow impeller oil-water separator according to claim 1, characterized in that: The hollow impeller mechanism (3) includes a mounting plate (3-1) and a hollow impeller (3-2); the mounting plate (3-1) has a mounting hole in the middle, and the hollow impeller (3-2) is mounted on the mounting hole of the mounting plate (3-1) by bolts.

4. The controlled-volume hollow impeller oil-water separator according to claim 1, characterized in that: The electric oil scraping mechanism (4) includes a drive shaft (4-1), a driven shaft (4-2), a sprocket (4-3), a chain (4-4), an oil scraper (4-5), a shaft mounting base (4-6), a drive motor (4-7), a pulley (4-8), and a belt (4-9). The two ends of the drive shaft (4-1) and driven shaft (4-2) are respectively mounted in the mounting holes of the shaft mounting base (4-6) via bearings. The shaft mounting base (4-6) is bolted to the oil-water separator (1). 4-1) Sprockets (4-3) are fixedly installed on both sides of the driven shaft (4-2). Chains (4-4) are wound around the left and right sprockets (4-3). Several oil scrapers (4-5) are installed obliquely on the chains (4-4). Pulleys (4-8) are fixedly installed on one end of the drive shaft (4-1) and on the shaft of the drive motor (4-7). The two pulleys (4-8) are connected by a belt (4-9). The drive motor (4-7) is fixedly installed on the top of the oil-water separator (1).

5. The controlled-height hollow impeller oil-water separator according to claim 4, characterized in that: The tilt angle of the scraper blade (4-5) ranges from 10 to 25°.

6. The controlled-height hollow impeller oil-water separator according to claim 5, characterized in that: The end of the scraper (4-5) is provided with a bent body (4-51), and the top of the scraper (4-5) is welded with two sets of fixing ears (4-52). Each set of fixing ears (4-52) includes two single ear pieces arranged in parallel, and each single ear piece is machined with fixing holes along its thickness direction.

7. The controlled-fluid-height hollow impeller oil-water separator according to claim 1, characterized in that: The dividing guide plate (5) is tilted to the right.

8. The controlled-volume hollow impeller oil-water separator according to claim 1, characterized in that: The oil collecting baffle (9) is an L-shaped plate, and the upper end of the oil collecting baffle (9) and the oil-water separator (1) are provided with an oil inlet gap (9-1).

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