Electrostatic demulsifying filter

Abstract

The present application relates to the technical field of oil-water separation, and discloses an electrostatic demulsification filter. The filter comprises a filter shell, and the filter shell forms an electrostatic cavity, a first water collecting cavity, a second water collecting cavity and an oil inlet cavity for accommodating fuel to be separated. The electrostatic cavity is communicated with the oil inlet cavity, and positive and negative electrode plates are arranged on the cavity wall in opposite directions, so that water droplets and clean fuel can be obtained after the fuel to be separated is demulsified. The first water collecting cavity is communicated with the electrostatic cavity and is used for collecting water droplets, and a first water discharge valve is installed at the bottom of the cavity and is used for selectively discharging the water droplets in the first water collecting cavity. The second water collecting cavity is used for collecting liquid overflowing from the electrostatic cavity, and a filter core body is installed in the second water collecting cavity and is used for filtering clean fuel, so that the clean fuel flows to an oil outlet cavity through a filter core passage. A second water discharge valve is installed at the bottom of the cavity and is used for selectively discharging water droplets in the second water collecting cavity. The filter utilizes the action of an electrostatic field to demulsify emulsified liquid, and long-term stable separation of emulsified water is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil-water separation, and particularly relates to an electrostatic demulsification filter. BACKGROUND

[0002] More and more additives are added to diesel, which makes it more and more difficult to separate emulsified water in diesel. In recent years, major filter manufacturers have successively launched advanced oil-water separation structures with two or three layers, which first gather emulsified water into large water droplets in the outer layer, and then block the water droplets with the water-repellent layer on the inside, so as to achieve good filtering effect.

[0003] However, no matter what kind of water gathering material is used, there will be a certain degree of efficiency decay after a long time of use, and it is impossible to maintain good emulsified water separation efficiency all the time. In order to prevent emulsified water in diesel from entering the engine and causing damage to the engine, a filter capable of maintaining good emulsified water separation efficiency for a long time is urgently needed. SUMMARY

[0004] The purpose of the present application is to provide an electrostatic demulsification filter, which uses the action of an electrostatic field to demulsify emulsified liquid, so as to maintain good emulsified water separation efficiency for a long time.

[0005] To achieve this purpose, the present application adopts the following technical solutions:

[0006] The electrostatic demulsification filter is used for separating fuel to be separated, and comprises a filter shell, wherein the filter shell forms an oil inlet cavity, an electrostatic cavity, a first water collecting cavity and a second water collecting cavity; the oil inlet cavity is used for accommodating the fuel to be separated; the electrostatic cavity is in communication with the oil inlet cavity, a positive plate and a negative plate are arranged on the cavity wall of the electrostatic cavity, and the positive plate and the negative plate are opposite to each other, so that the fuel to be separated located between the positive plate and the negative plate can be demulsified to obtain water droplets and clean fuel; the first water collecting cavity is in communication with the electrostatic cavity and is used for collecting the water droplets, a first water discharge valve is installed at the bottom of the first water collecting cavity, and the first water discharge valve selectively discharges the water droplets in the first water collecting cavity; the second water collecting cavity can collect liquid overflowing from the electrostatic cavity, a filter core body is installed in the second water collecting cavity, the filter core body is used for filtering the clean fuel, so that the clean fuel flows to an oil outlet cavity through a filter core passage of the filter core body, and a second water discharge valve is installed at the bottom of the second water collecting cavity, and the second water discharge valve selectively discharges the water droplets in the second water collecting cavity.

[0007] As the preferred technical scheme of the electrostatic demulsification filter, the communication opening of the oil inlet cavity and the electrostatic cavity is arranged at a first position, and the communication opening of the first water collecting cavity and the electrostatic cavity is arranged at a second position; the first position and the second position are respectively located at two ends of the electrostatic cavity, and the line connecting the first position and the second position is parallel to the plane where the positive plate is located.

[0008] As the preferred technical scheme of the electrostatic demulsification filter, the first position is located at the cavity bottom of the electrostatic cavity, and the second position is located at the cavity bottom of the electrostatic cavity.

[0009] As the preferred technical scheme of the electrostatic demulsification filter, the first water valve is further provided with a control unit, and the control unit is used for controlling the opening and closing of the first water valve.

[0010] As the preferred technical scheme of the electrostatic demulsification filter, the first water valve is further provided with a first water level sensor, and the first water level sensor is used for monitoring the liquid level of the water droplets in the first water collecting cavity.

[0011] As the preferred technical scheme of the electrostatic demulsification filter, the cavity wall of the second water collecting cavity seals two ends of the filter core channel, and the oil outlet cavity is connected with the filter core channel through a communication pipe arranged at the cavity bottom of the second water collecting cavity.

[0012] As the preferred technical scheme of the electrostatic demulsification filter, the filter shell comprises a top cover and a base, the top cover is detachably connected to the base, the top cover is provided with a first groove and a second groove, the base is provided with a third groove and a fourth groove, the first groove and the third groove are spliced to form the electrostatic cavity, and the second groove and the fourth groove are spliced to form the second water collecting cavity.

[0013] As the preferred technical scheme of the electrostatic demulsification filter, the oil inlet cavity is connected with an external oil supply device through an oil inlet, and the external oil supply device is used for providing the oil to be separated to the oil inlet cavity.

[0014] As the preferred technical scheme of the electrostatic demulsification filter, the electrostatic cavity is provided with two, and the two electrostatic cavities are symmetrically arranged about the center of the second water collecting cavity.

[0015] As the preferred technical scheme of the electrostatic demulsification filter, the electrostatic demulsification filter further comprises an electric field controller, and the electric field controller is used for controlling the voltage of the positive plate and the voltage of the negative plate.

[0016] The beneficial effects of the present application are as follows:

[0017] The electrostatic demulsification filter forms an electrostatic field between the positive plate and the negative plate by setting the positive plate and the negative plate in the electrostatic cavity, and the electrostatic field can complete the demulsification, coalescence and sedimentation operation of the emulsified water in the fuel to be separated, and the emulsified water droplets in the fuel are deformed, broken, coalesced and settled under the action of the electrostatic field, and the water droplets after demulsification are settled in the first water collecting cavity; after the electrostatic cavity is filled, the water droplets that are not completely settled flow to the second water collecting cavity with the clean fuel; the filter core body filters the clean fuel, and the clean fuel flows to the oil outlet cavity, the filter core body blocks the water droplets that are not completely settled and makes them settle at the bottom of the second water collecting cavity. The above structural improvement reduces the risk of emulsified water in the fuel to be separated entering the engine, avoids the damage of the engine, replaces the conventional design scheme of applying water collecting material, effectively slows down the efficiency decay of the electrostatic demulsification filter after long time use, and can maintain good emulsified water separation efficiency for a long time. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of the electrostatic demulsification filter provided by the embodiment of the present application;

[0019] Figure 2 is a structural schematic diagram of the electrostatic demulsification filter except the top cover provided by the embodiment of the present application;

[0020] Figure 3 is a front view of the electrostatic demulsification filter provided by the embodiment of the present application;

[0021] Figure 4 is Figure 3 the cross-sectional view of the A-A plane in FIG. 4;

[0022] Figure 5 is Figure 3 the cross-sectional view of the B-B plane in FIG. 4;

[0023] Figure 6 is Figure 3 the cross-sectional view of the C-C plane in FIG. 4;

[0024] Figure 7 is a side view of the electrostatic demulsification filter provided by the embodiment of the present application;

[0025] Figure 8 is Figure 7 the cross-sectional view of the D-D plane in FIG. 4;

[0026] Figure 9 is a structural schematic diagram of the electric field controller provided by the embodiment of the present application.

[0027] In the drawings:

[0028] 100, top cover; 200, base; 210, oil inlet cavity; 211, oil inlet; 220, oil outlet cavity; 221, oil outlet; 230, first electrostatic cavity; 231, first positive plate; 232, first negative plate; 233, first communication port; 234, second communication port; 240, second electrostatic cavity; 241, second positive plate; 242, second negative plate; 243, third communication port; 244, fourth communication port; 250, second water collecting cavity; 260, first water collecting cavity; 300, electric field controller; 310, whole vehicle interface; 320, electrode plate interface; 400, second drain valve; 500, first drain valve; 600, filter core body; 610, filter core channel. DETAILED DESCRIPTION

[0029] The technical solutions of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and moreover, the "above", "above" and "above" of the first feature to the second feature include the "above" and "above" of the first feature to the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include the "below" and "below" of the first feature to the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0031] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, for the purpose of explanation, and are not to be understood as a limitation of the present application.

[0033] As Figures 1-9 shown, the present embodiment provides an electrostatic demulsification filter for separating fuel oil to be separated, comprising a filter housing, the filter housing forms an oil inlet cavity 210, an electrostatic cavity, a first water collection cavity 260 and a second water collection cavity 250; the oil inlet cavity 210 is used to accommodate the fuel oil to be separated; the electrostatic cavity is communicated with the oil inlet cavity 210, the cavity wall of the electrostatic cavity is provided with a positive plate and a negative plate, and the positive plate and the negative plate are opposite to each other, which can demulsify the fuel oil to be separated located between the positive plate and the negative plate to obtain water droplets and clean fuel oil; the first water collection cavity 260 is communicated with the electrostatic cavity and is used to collect water droplets, the bottom of the first water collection cavity 260 is provided with a first water drain valve 500, and the first water drain valve 500 selectively discharges the water droplets in the first water collection cavity 260; the second water collection cavity 250 can collect the liquid overflowing from the electrostatic cavity, and a filter element body 600 is installed in the second water collection cavity 250, which is used to filter the clean fuel oil, so that the clean fuel oil flows to the oil outlet cavity 220 through the filter channel 610 of the filter element body 600, and the bottom of the second water collection cavity 250 is provided with a second water drain valve 400, which selectively discharges the water droplets in the second water collection cavity 250.

[0034] The electrostatic demulsification filter forms an electrostatic field between the positive plate and the negative plate by arranging the positive plate and the negative plate in the electrostatic cavity, which can complete the demulsification, coalescence and sedimentation of emulsified water in the fuel oil to be separated, and the emulsified water droplets in the oil will deform, break, coalesce and sediment under the action of the electrostatic field, and the water droplets after demulsification will sediment in the first water collection cavity 260; after the electrostatic cavity is filled, the water droplets that have not completely settled will flow to the second water collection cavity 250 with the clean fuel oil; the filter element body 600 filters the clean fuel oil, so that the clean fuel oil flows to the oil outlet cavity 220, the filter element body 600 blocks the water droplets that have not completely settled and makes them sediment at the bottom of the second water collection cavity 250. The above structural improvement reduces the risk of emulsified water in the fuel oil to be separated entering the engine, avoiding the situation that the engine is damaged. Instead of the conventional design scheme of using water collecting material, it effectively slows down the efficiency decay of the electrostatic demulsification filter after long-term use, so that it can maintain good emulsified water separation efficiency for a long time.

[0035] Specifically, the main component of the fuel oil to be separated is diesel oil.

[0036] In the embodiment, the communication port of the oil inlet cavity 210 with the electrostatic cavity is arranged at a first position, and the communication port of the first water collection cavity 260 with the electrostatic cavity is arranged at a second position; the first position and the second position are respectively located at two ends of the electrostatic cavity, and a line connecting the first position and the second position is parallel to a plane where the positive plate is located.

[0037] The design that the first position and the second position are respectively located at two ends of the electrostatic cavity limits the positions where the oil inlet cavity 210 and the first water collection cavity 260 communicate with the electrostatic cavity, effectively avoiding the situation that the to-be-separated fuel oil flowing from the oil inlet cavity 210 into the electrostatic cavity has not been sufficiently demulsified, coalesced and settled by the electrostatic field, and flowing into the first water collection cavity 260. The above layout design adjusts the flow trajectory of the to-be-separated fuel oil, prolongs the time for the to-be-separated fuel oil to stay in the electrostatic cavity, and thus improves the separation effect of the electrostatic demulsification filter on emulsified water.

[0038] Further, the first position is located at the bottom of the electrostatic cavity, and the second position is located at the bottom of the electrostatic cavity. The design that the first position is located at the bottom limits the position where the to-be-separated fuel oil flows into the electrostatic cavity, avoiding the situation that the to-be-separated fuel oil directly enters the second water collection cavity 250 due to accidents, and also avoiding the risk of water splashing in the electrostatic cavity. The design that the second position is located at the bottom limits the position where the water droplets flow out of the electrostatic cavity, avoiding the situation that the settled water droplets cannot flow out of the electrostatic cavity. The above design improves the efficiency of liquid circulation in the electrostatic cavity, optimizes the flow trajectory of the liquid in the electrostatic cavity, and realizes full use of the space of the electrostatic cavity.

[0039] In the embodiment, the first water valve 500 is also provided with a control unit for controlling the opening and closing of the first water valve 500. When the liquid level of the water droplets in the first water collection cavity 260 is higher than a first liquid level, the first water valve 500 is opened to discharge the water droplets out of the first water collection cavity 260, and when the liquid level of the water droplets in the first water collection cavity 260 is lower than a second liquid level, the first water valve 500 is closed to stop discharging the water droplets. The above design realizes accurate control of the liquid level of the water droplets in the first water collection cavity 260, avoiding the problem that the liquid level of the water droplets is too high to cause space compression in the electrostatic cavity, so that the electrostatic demulsification operation cannot be fully completed.

[0040] Further, the first water valve 500 is also provided with a first water level sensor for monitoring the liquid level of the water droplets in the first water collection cavity 260. The first water level sensor has a simple structure and is reliable in operation, and can smoothly complete the monitoring of the liquid level of the water droplets in the first water collection cavity 260.

[0041] Specifically, the first water level sensor is communicatively connected with the alarm unit, when the liquid level of the water droplets in the first water collecting cavity 260 is higher than the first liquid level, the alarm unit sends an alarm to remind the operator to open the first water drain valve 500. The setting of the alarm unit makes the electrostatic demulsification filter have the function of reminding, avoiding the situation that the operator forgets to discharge the water droplets due to mistake.

[0042] In other embodiments of the present embodiment, the control unit is also used to control the opening and closing of the second water drain valve 400. When the liquid level of the water droplets in the second water collecting cavity 250 is higher than the third liquid level, the second water drain valve 400 is opened to discharge the water droplets out of the second water collecting cavity 250, and when the liquid level of the water droplets in the second water collecting cavity 250 is lower than the fourth liquid level, the second water drain valve 400 is closed to stop discharging the water droplets; the second water level sensor is also installed on the second water drain valve 400, and the second water level sensor is used to monitor the liquid level of the water droplets in the second water collecting cavity 250.

[0043] In the present embodiment, the cavity wall of the second water collecting cavity 250 closes both ends of the filter core channel 610, and the oil outlet cavity 220 is connected with the filter core channel 610 through the communication pipe arranged at the bottom of the second water collecting cavity 250. The above design avoids the situation that the liquid in the second water collecting cavity 250 directly enters the filter core channel 610 without being filtered by the filter core body 600, thereby improving the filtering capacity of the electrostatic demulsification filter and ensuring that the liquid flowing into the oil outlet cavity 220 is clean fuel filtered.

[0044] Specifically, the oil outlet cavity 220 is communicated with the bottom of the second water collecting cavity 250, the communication pipe is inserted into the opening of the oil outlet cavity 220, and the communication pipe is coaxially locked with the filter core body 600. The above design not only ensures the positioning effect of the filter core body 600 in the second water collecting cavity 250, but also ensures that the clean fuel entering the filter core channel 610 can smoothly flow into the oil outlet cavity 220, which is simple in structure, compact in structure and high in working stability.

[0045] Exemplarily, the filter housing includes a top cover 100 and a base 200, the top cover 100 is detachably connected to the base 200, the top cover 100 is provided with a first groove and a second groove, the base 200 is provided with a third groove and a fourth groove, the first groove and the third groove are spliced to form an electrostatic cavity, and the second groove and the fourth groove are spliced to form a second water collecting cavity 250. The split design of the filter housing reduces the difficulty of production, improves the manufacturing efficiency of the electrostatic demulsification filter, and is helpful to realize the large-scale production of the electrostatic demulsification filter.

[0046] Specifically, the base 200 is injection molded on the positive plate and the negative plate. The above molding method simplifies the production steps, improves the manufacturing efficiency, ensures the connection stability of the positive plate and the negative plate on the base 200, and prolongs the service life of the electrostatic demulsification filter.

[0047] In the embodiment, the oil inlet cavity 210 is in communication with an external oil supply device through the oil inlet port 211, and the external oil supply device is used to supply the fuel oil to be separated to the oil inlet cavity 210. The oil outlet cavity 220 is in communication with an external collection device through the oil outlet port 221, and the external collection device is used to collect the clean fuel oil discharged from the oil outlet cavity 220.

[0048] Exemplarily, two electrostatic cavities are provided, and the two electrostatic cavities are symmetrically arranged about the center of the second water collecting cavity 250. The design symmetrically about the center of the second water collecting cavity 250 ensures that the two electrostatic cavities can discharge the liquid into the second water collecting cavity 250 after sufficiently completing the operation of electrostatic demulsification, avoids the mutual influence of the liquid flow trajectories between the electrostatic cavities, and optimizes the separation efficiency and separation effect of the emulsified water.

[0049] Specifically, the two electrostatic cavities are a first electrostatic cavity 230 and a second electrostatic cavity 240, a positive plate forming an electrostatic field in the first electrostatic cavity 230 is a first positive plate 231, a negative plate forming an electrostatic field in the first electrostatic cavity 230 is a first negative plate 232, a positive plate forming an electrostatic field in the second electrostatic cavity 240 is a second positive plate 241, and a negative plate forming an electrostatic field in the second electrostatic cavity 240 is a second negative plate 242; the first electrostatic cavity 230 is in communication with the oil inlet cavity 210 through a first communication port 233, the second electrostatic cavity 240 is in communication with the oil inlet cavity 210 through a second communication port 243, the first electrostatic cavity 230 is in communication with the first water collecting cavity 260 through a third communication port 234, and the second electrostatic cavity 240 is in communication with the first water collecting cavity 260 through a fourth communication port 244.

[0050] In the embodiment, the electrostatic demulsification filter further comprises an electric field controller 300, and the electric field controller 300 is used to control the voltage of the positive plate and the voltage of the negative plate. The electric field controller 300 can be matched and developed according to the corresponding control logic of the customer's demand. The wire harness of all the positive plates and the negative plates is connected with an electrode plate interface 320 on the electric field controller 300, and the power supply and the voltage of the positive plates and the negative plates are uniformly controlled by the electric field controller 300. The electric field controller 300 also reserves a vehicle interface 310, and the information transmission between the electrostatic demulsification filter and the vehicle can be completed by using the vehicle interface 310.

[0051] Specifically, the electric field controller 300 is screwed on the outer wall of the base 200.

[0052] In the embodiment, the whole vehicle supplies power to the electric field controller 300, and the electric field controller 300 independently controls the positive plate and the negative plate. The electric field controller 300 can detect the electric field strength between the positive plate and the negative plate, and adjust the voltage between the positive plate and the negative plate according to the feedback data, so as to realize the control of the electrostatic field strength. When the water content of the fuel to be separated changes, the electric field controller 300 can automatically adjust the electrostatic field strength to ensure that the emulsified water can achieve the best demulsification effect and ensure the permanent good emulsified water separation effect. At the same time, the electric field controller 300 can overload and short circuit protection, and has a circuit breaking alarm function. In normal use, the electric field controller 300 can transfer the information of the electric field controller 300 to the instrument panel of the whole vehicle to display the working state of the whole vehicle in real time.

[0053] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments cannot be exhausted. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. An electrostatic demulsifier filter for separating fuel to be separated, characterized in that The filter housing comprises: An oil inlet cavity (210) for receiving the fuel to be separated; An electrostatic cavity in communication with the oil inlet cavity (210), wherein a positive plate and a negative plate are arranged on the cavity wall of the electrostatic cavity, and the positive plate and the negative plate are opposite to each other, so that the fuel to be separated between the positive plate and the negative plate is broken after demulsification to obtain water droplets and clean fuel; A first water collecting cavity (260) in communication with the electrostatic cavity for collecting the water droplets, wherein a first water drain valve (500) is arranged at the bottom of the first water collecting cavity (260) to selectively drain the water droplets in the first water collecting cavity (260); A second water collecting cavity (250) for collecting liquid overflowing from the electrostatic cavity, wherein a filter core body (600) is arranged in the second water collecting cavity (250) to filter the clean fuel, and the filter core body (600) can block the water droplets that have not completely settled, so that the clean fuel flows through a filter core passage (610) of the filter core body (600) to an oil outlet cavity (220), and a second water drain valve (400) is arranged at the bottom of the second water collecting cavity (250) to selectively drain the water droplets in the second water collecting cavity (250).

2. The electrostatic de-emulsification filter of claim 1, wherein, The communication port of the oil inlet cavity (210) and the electrostatic cavity is arranged at a first position, and the communication port of the first water collecting cavity (260) and the electrostatic cavity is arranged at a second position; the first position and the second position are respectively located at two ends of the electrostatic cavity, and the line connecting the first position and the second position is parallel to the plane where the positive plate is located.

3. The electrostatic de-emulsification filter of claim 2, wherein, The first position is located at the bottom of the electrostatic cavity, and the second position is also located at the bottom of the electrostatic cavity.

4. The electrostatic de-emulsifying filter of claim 1, wherein, A control unit is further arranged on the first water drain valve (500), and the control unit is used to control the opening and closing of the first water drain valve (500).

5. The electrostatic de-emulsification filter of claim 4, wherein, A first water level sensor is further arranged on the first water drain valve (500), and the first water level sensor is used to monitor the water level of the water droplets in the first water collecting cavity (260).

6. The electrostatic de-emulsifying filter of claim 1, wherein, The cavity wall of the second water collecting cavity (250) seals two ends of the filter core passage (610), and the oil outlet cavity (220) is in communication with the filter core passage (610) through a communication pipe arranged at the bottom of the second water collecting cavity (250).

7. The electrostatic de-emulsifying filter of claim 1, wherein, The filter housing comprises a top cover (100) and a base (200), the top cover (100) is detachably connected to the base (200), the top cover (100) is provided with a first groove and a second groove, the base (200) is provided with a third groove and a fourth groove, the first groove and the third groove are spliced to form the electrostatic cavity, and the second groove and the fourth groove are spliced to form the second water collecting cavity (250).

8. The electrostatic de-emulsifying filter of claim 1, wherein, The oil inlet cavity (210) is in communication with an external oil supply device through an oil inlet port (211), and the external oil supply device is used to provide the fuel to be separated to the oil inlet cavity (210).

9. The electrostatic de-emulsifying filter of claim 1, wherein, The electrostatic cavities are provided in two, and the two electrostatic cavities are symmetrically arranged about the center of the second water collecting cavity (250).

10. The electrostatic de-emulsification filter according to any one of claims 1-9, characterized in that, The electrostatic demulsification filter further comprises an electric field controller (300) for controlling the voltage of the positive plate and the voltage of the negative plate.

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