Circulating feed liquid filter for preparing and producing demulsifier

Abstract

The invention discloses a circulating feed liquid filter for demulsifying agent preparation and production, and relates to the technical field of circulating filtration for demulsifying agent preparation and production. An arc-shaped cutting block at the bottom of a rotating disc rotates to press a movable cover on a fixed pipe, so that a demulsifying agent preliminarily filtered in a filter cover is continuously pumped out and discharged into a controller for detection; the motor on the storage box is regulated and controlled to rotate, and the sealing piston I on the connecting column is pulled to move in the moving process of the toothed chain, so that the demulsifier is timely discharged into the filter cartridge for secondary filtration when the impurities contained in the demulsifier are inconsistent, and the demulsifier meeting the standard in repeated filtration enters the storage box from an outlet in the other side of the flow divider while pushing the sealing piston II to move; the whole circulating feed liquid filtering mechanism not only can filter the demulsifier, but also can detect the filtered filtrate.

Description

Technical Field

[0001] The invention relates to the technical field of circulating filtration in the preparation and production of demulsifiers, in particular to a circulating liquid filter in the preparation and production of demulsifiers. Background Art

[0002] Demulsifier is a non-ionic surfactant used for dehydration. It can remove water from crude oil and heavy oil to make the water content meet the requirements. It can reduce the viscosity of crude oil when used in oil wells. It is easily soluble in water and the aqueous solution is milky white. In crude oil and other mixtures, some solids are difficult to dissolve in water. When one or more of these solids exist in a large amount in an aqueous solution, under the stirring of hydraulic or external power, these solids can exist in water in an emulsified state to form an emulsion. Theoretically, this system is unstable, but if there are some surfactants, the emulsification state is very serious, and even the two phases are difficult to separate. In this case, some agents are added to destroy the stable double-layer structure and stabilize the emulsified system, so as to achieve the purpose of separating the two phases. These agents used to achieve the effect of destroying the emulsification are called demulsifiers. In the filtration and impurity removal operation performed in the demulsifier production process, there is a lack of detection of the demulsifier after filtration, so it is impossible to understand whether the demulsifier after preliminary filtration has reached the production standard. The existence of suspended impurities in the demulsifier varies greatly; Therefore, we propose a circulating liquid filter for the preparation and production of demulsifiers. Summary of the invention

[0003] The object of the present invention is to provide a circulating liquid filter for preparing and producing demulsifiers, so as to solve the problem in the above background technology that there are large differences in suspended impurities in the filtered demulsifiers, which affects the subsequent demulsifier treatment effect.

[0004] To achieve the above object, the present invention provides the following technical solution: a circulating liquid filter for preparing and producing demulsifier, comprising a filter box and a storage box, a storage box is installed on one side of the filter box, an electric control box is fixed to the top of the filter box by bolts, a filter cover is symmetrically installed on the inner wall of the bottom of the filter box, and a pumping mechanism is installed in the filter cover; The controller and the diverter are fixed to the top of the storage box by bolts, the motor is fixed to the top of the storage box by bolts, a connecting column is slidably connected in the diverter, and the two ends of the connecting column penetrate the two sides of the diverter and are connected to a toothed chain, and a gear is connected to the output end of the motor and meshes with the toothed chain; The controller includes a data acquisition unit and a data sub-control unit, wherein the data acquisition unit is used to obtain composite information of the demulsifier after passing through the pumping mechanism, and send the composite information to the data sub-control unit, wherein the demulsifier composite information consists of a demulsifier flow rate factor, a demulsifier vibration frequency factor and a demulsifier hydraulic pressure factor; The data sub-control unit is used to obtain composite information after the demulsifier passes through the pumping mechanism and perform supervision and analysis operations. The specific steps are as follows: Step 1: calibrate the demulsifier flow rate factor, demulsifier vibration frequency factor and demulsifier hydraulic pressure factor in the obtained demulsifier composite information as Pl, Pz and Py; Step 2: According to the formula: , where the demulsifier impurity level R, a1, a2 and a3 are correction factors, and a1>a3>a2>0; Step 3: Compare the demulsifier impurity level R with the demulsifier impurity threshold r stored in the data sub-control unit, and send the generated control signal to the motor: When R ≥ r, a primary control signal is generated; When R<r, a secondary control signal is generated; When the relay in the motor receives the primary control signal, the motor drives the gear chain to move left and right, and drives the connecting column in the diverter to move left and right; When the relay in the motor receives the secondary control signal, the motor is turned off.

[0005] Furthermore, a turntable is installed on the top of the electrical control box, and an arc-shaped block is fixedly connected to the bottom of the turntable, a filter cartridge is installed on the inner wall of the filter box, a filter screen 2 is installed on the inner wall of the filter cartridge, a rotating shaft is installed on the bottom of the electrical control box, and one end of the rotating shaft passes through the top of the filter box and extends into the filter cartridge, and a stainless steel brush is fixedly mounted on the rotating shaft in the filter cartridge.

[0006] Furthermore, the exhaust mechanism includes a movable cover, a fixed tube sealing ball 1 and a sealing ball 2. A fixed tube is fixedly connected to the bottom of the filter box and located inside the filter cover. Feed ports are symmetrically provided on both sides of the fixed tube. A movable cover is slidably connected to the upper portion of the fixed tube, and a discharge port is provided on one side of the movable cover. Sealing ball 1 is installed in the movable cover, and sealing ball 2 is installed on the top of the fixed tube.

[0007] Furthermore, a filter screen is installed on the outer wall of the filter cover, a spring is installed on the outer wall of the fixed tube in the filter cover, a limit pin is fixed in the filter cartridge and at the bottom of the filter box, and the limit pin is slidably connected to the movable cover.

[0008] Furthermore, a liquid level float is installed in the filter box, one side of the movable cover passes through the filter box and is slidably connected to the filter box, the outlet on the movable cover is connected to a connecting pipe, and one side of the connecting pipe is connected to a controller, a sewage pipe is installed on one side of the filter box, and one side of the sewage pipe is connected to the filter cartridge, and one side of the filter box is connected to a feed pipe.

[0009] Furthermore, a sealing piston 2 is symmetrically and slidably connected inside the diverter, one end of the connecting column passes through the sealing piston 2 and is slidably connected to the sealing piston 2, a sealing piston 1 is fixedly mounted on the two opposite surfaces of the sealing piston 2 and located on the connecting column, a spring 2 is mounted on the opposite surface of the sealing piston 2 and the inner wall of the diverter and located on the connecting column, and one side of the controller is correspondingly connected to the diverter.

[0010] The circulating liquid filtration method for preparing and producing the demulsifier is as follows: The demulsifier is discharged into the filter box through the feed pipe. When the liquid level float reaches the set height, the liquid intake stops. The electric control box drives the turntable to rotate. The arc-shaped cutout at the bottom of the turntable begins to contact the movable cover cyclically. The movable cover is pressed to continuously compress the air in the fixed pipe, causing the fixed pipe to start sucking the demulsifier into the filter cover. The subsequent continuous squeezing causes the demulsifier to enter the fixed pipe and finally enter the controller through the connecting pipe on the side of the discharge port. The controller performs an analysis of the impurity content of the demulsifier and sends the generated control signal to the motor. When the impurity content of the demulsifier is relatively high, the motor drives the toothed chain to rotate, and the toothed chain drives the connecting column to move, thereby controlling the position of the sealing piston 1 in the diverter, causing the demulsifier entering the diverter from the controller to enter the filter cartridge through the C port of the diverter, completing the secondary filtration of the demulsifier. When the demulsifier is analyzed in the controller and meets the standards, the motor stops rotating, and the demulsifier entering the diverter begins to squeeze the sealing piston 1, and finally the demulsifier flows from the A port on the diverter into the storage box for storage.

[0011] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, the movable cover on the fixed tube is pressed by rotating the arc-shaped cut block at the bottom of the turntable, so that the demulsifier preliminarily filtered in the filter cover is continuously extracted and discharged into the controller for detection. After the detection, the controller generates a corresponding control signal to adjust the rotation of the motor on the storage box, and pulls the sealing piston on the connecting column to move during the activity of the tooth chain, so that when the demulsifier does not meet the requirements, it is promptly discharged into the filter cartridge for secondary filtration. In the repeated filtration, the demulsifier that meets the standards enters the storage box from the outlet on the other side of the diverter while pushing the sealing piston to move. The entire circulating liquid filtration mechanism can not only filter the demulsifier, but also detect the filtered filtrate, so as to prevent the demulsifier after filtration from having large differences and affecting the subsequent use effect of the demulsifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the overall structure of a circulating liquid filter for preparing and producing the demulsifier of the present invention; Figure 2 This is a schematic diagram of the front cross-sectional structure of the filter box of the present invention; Figure 3It is a schematic diagram of the overall structure of the pumping and exhausting mechanism of the present invention; Figure 4 This is a schematic diagram of the top view of the filter cartridge of the present invention; Figure 5 It is a schematic diagram of the connection structure between the controller, the movable cover and the diverter of the present invention; Figure 6 This is a working diagram of a circulating liquid filter for preparing and producing the demulsifier of the present invention.

[0013] In the figure: 1. filter box; 2. storage box; 3. electric control box; 4. turntable; 5. arc-shaped cutting block; 6. pumping mechanism; 601. movable cover; 602. fixed pipe; 603. discharge port; 604. sealing ball one; 605. sealing ball two; 606. feed port; 7. filter cover; 8. filter screen one; 9. limit pin; 10. spring one; 11. filter cartridge; 12. filter screen two; 13. rotating shaft; 14. stainless steel brush; 15. liquid level float; 16. drain pipe; 17. feed pipe; 18. diverter; 19. sealing piston one; 20. sealing piston two; 21. connecting column; 22. tooth chain; 23. motor; 24. spring two; 25. controller; 26. connecting pipe. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] See also Figure 1-6 , the present invention provides a technical solution: Example 1: Demulsifier-based filtration, such as Figure 1 As shown, the demulsifier to be purified is discharged into the filter box 1 through the feed pipe 17 on one side, and the liquid level control is convenient, such as Figure 2 The filter box 1 shown is equipped with a liquid level float 15 to reflect the amount of demulsifier added in real time. A storage box 2 is installed on one side of the filter box 1 to store the demulsifier after filtering. A filter cover 7 is symmetrically installed in the filter box 1, and a filter screen 8 is installed on the filter cover 7. Under the action of liquid pressure, demulsifier continuously breaks through the filter screen 8 and enters the filter cover 7 to complete the preliminary filtration of the demulsifier. Figure 3As shown, a pumping mechanism 6 is installed in the filter cover 7, a fixed pipe 602 is fixed on the inner wall of the bottom of the filter box 1, and a feed port 606 is opened, a spring 10 is sleeved and installed on the outer periphery of the fixed pipe 602, a movable cover 601 is sleeved and slidably connected to the outer wall of the fixed pipe 602, and the bottom of the movable cover 601 abuts against the spring 10, while improving the sliding stability of the movable cover 601 on the fixed pipe 602, and the limit pin 9 inserted on the outer side of the movable cover 601 is fixed to the bottom of the filter box 1; The port of the fixed pipe 602 located in the movable cover 601 is installed with a sealing ball 2 605, and the inner side of the movable cover 601 is installed with a sealing ball 1 604, wherein the top of the movable cover 601 penetrates the filter box 1 and abuts against the bottom of the rotary disk 4, the connecting pipe 26 connected to the movable cover 601 is connected to the controller 25 at the top of the storage box 2, and one side of the controller 25 is connected to the diverter 18; The bottom of the rotating disk 4 is fixedly connected with an arc-shaped cutting block 5. After the electric control box 3 drives the rotating disk 4 to rotate, the arc-shaped cutting block 5 contacts the top of the movable cover 601 and actively presses it, so that the movable cover 601 moves downward on the surface of the fixed tube 602. The sealing ball 605 located on the fixed tube 602 reduces the gap between the movable cover 601 and the fixed tube 602. When the movable cover 601 is pushed upward by the spring 10, the demulsifier continuously flows into the fixed cover 601 along the feed port 606. The sealing ball 605 on the top of the fixed tube 602 is pushed open, and the demulsifier enters the cavity of the movable cover 601. Then the movable cover 601 is pressed down, and the gap between the movable cover 601 and the fixed tube 602 is continuously reduced, and the demulsifier is squeezed up and down, and the sealing ball 604 on the top of the movable cover 601 is pushed open. Subsequently, the demulsifier on the top of the sealing ball 604 is continuously accumulated, and finally, during the extrusion process of the arc-shaped cut block 5, the demulsifier is discharged from the discharge port 603 into the controller 25; Through the suction operation of the movable cover 601 at the top of the fixed pipe 602, the demulsifier initially filtered in the filter cover 7 is continuously discharged into the controller 25 for detection. At the same time, the suction discharge method accelerates the circulation of the demulsifier in the filter cover 7 and improves the filtering efficiency of the entire filter cover 7.

[0016] Embodiment 2: Considering whether the demulsifier after preliminary filtering is qualified, a controller 25 is installed on the top of the entire storage box 2 to detect the demulsifier after preliminary filtering; The controller 25 includes a data acquisition unit and a data sub-control unit. The data acquisition unit is used to obtain composite information of the demulsifier after passing through the pumping mechanism 6, and send the composite information to the data sub-control unit, wherein the demulsifier composite information is composed of the demulsifier flow rate factor, the demulsifier vibration frequency factor and the demulsifier hydraulic pressure factor. According to the amount of suspended particles in the demulsifier, the demulsifier flow rate factor, the demulsifier vibration frequency factor and the demulsifier hydraulic pressure factor are derived, and the three factors can reflect the amount of impurities contained in the demulsifier, similar to the low demulsifier flow rate, which indirectly reflects that the demulsifier contains more impurities; The data sub-control unit is used to obtain composite information after the demulsifier passes through the pumping mechanism 6, and to perform supervision and analysis operations. The specific steps are as follows: Step 1: calibrate the demulsifier flow rate factor, demulsifier vibration frequency factor and demulsifier hydraulic pressure factor in the obtained demulsifier composite information as Pl, Pz and Py; Step 2: According to the formula: , where the demulsifier impurity level R, a1, a2 and a3 are correction factors, and a1>a3>a2>0; Step 3: Compare the demulsifier impurity level R with the demulsifier impurity threshold value r stored in the data sub-control unit, and send the generated control signal to the motor 23: When R ≥ r, a primary control signal is generated; When R<r, a secondary control signal is generated; like Figure 5 and Figure 6 As shown, the discharge end on one side of the controller 25 is connected to the B port on the diverter 18, and the connecting side of the diverter 18 is also provided with an A port and a C port, wherein the A port is connected to the storage box 2 through a pipeline, and the C port is connected to the inner filter cartridge 11 through a pipeline; A sealing piston 20 is symmetrically and slidably connected in the diverter 18. The outer wall of the sealing piston 20 is pushed by a spring 24 under normal conditions, so that the A port on the diverter 18 is blocked. A sealing piston 19 is also slidably connected between the sealing piston 20 in the diverter 18. Under normal conditions, the sealing piston 19 blocks the C port on the diverter 18. At the same time, connecting columns 21 are fixedly connected on both sides of the sealing piston 19. One end of the connecting column 21 passes through the sealing piston 20 and the diverter 18 respectively and is connected to a toothed chain 22. The toothed chain 22 is sleeved on two sets of gears movably connected at the top of the storage box 2. At the same time, one of the gears is fixed to the output end of the motor 23. The toothed chain 22 is driven to move by the rotation of the motor 23, and finally the sealing piston 19 is pulled to move left and right in the diverter 18, and the movable cover 601 is driven to discharge liquid left and right in cooperation with the turntable 4, and finally the demulsifier entering the diverter 18 is discharged from the C port into the filter cartridge 11. Specifically combined with Figure 5 and 2, when the arc-shaped cutout at the bottom of the turntable 4 presses down the left movable cover 601, the movable cover 601 discharges the primary filter demulsifier into the controller 25 for impurity detection. When the impurity content of the primary filter demulsifier meets the specified standard, the motor 23 drives the toothed chain 22 to rotate counterclockwise, and the sealing piston 19 located in the diverter 18 moves to the right, so that the C port on the left side of the diverter 18 is opened, and the demulsifier entering the diverter 18 comes to the filter cartridge 11 for secondary screening. When the primary filter demulsifier detected by the controller 25 meets the standard, the motor 23 drives the sealing piston 19 to move to the middle of the diverter 18 to complete the sealing of the two C ports. At the same time, the motor 23 is disconnected from the power supply and cannot be rotated manually. At this time, the volume of the demulsifier entering the diverter 18 from the B port continues to increase, and the sealing piston 20 is squeezed to the left. Finally, the tightened demulsifier in the diverter 18 is successfully discharged from the left A port into the storage box; When the relay in the motor 23 receives the primary control signal, the motor 23 drives the gear chain 22 to move left and right, and drives the connecting column 21 in the diverter 18 to move left and right; When the relay in the motor 23 receives the secondary control signal, the motor 23 is turned off; like Figure 4 As shown, a filter screen 12 is installed on the inner and outer walls of the filter cartridge 11, and the mesh size of the filter screen 12 is smaller than that of the filter screen 1 8. After the demulsifier is initially filtered into the filter cartridge 11, it is filtered again by the filter screen 12 and flows back into the filter box 1. After being mixed with the demulsifier stored in the filter box 1, it is re-tested until it passes the impurity detection of the controller 25. A stainless steel brush 14 is also installed in the filter cartridge 11. The power device in the electric control box 3 drives the stainless steel brush 14 on the rotating shaft 13 to brush the inner wall of the filter cartridge 11 after the demulsifier filtration is completed, and the fine impurities adhering to the filter screen 12 are removed. At the same time, the removed impurity sewage is discharged through the sewage pipe 16 connected to the bottom of the filter cartridge 11 to ensure the cleanliness of the filter screen 12.

[0017] The working process and principle of the present invention are as follows: The demulsifier is discharged into the filter box 1 through the feed pipe 17. When the liquid level float 15 reaches the set height, the liquid inlet stops. The electric control box 3 drives the turntable 4 to rotate. The arc-shaped cutout 5 at the bottom of the turntable 4 begins to contact the movable cover 601 cyclically, pressing the movable cover 601 to continuously compress the air in the fixed pipe 602, causing the fixed pipe 602 to start sucking the demulsifier into the filter cover 7. The subsequent continuous squeezing causes the demulsifier to enter the fixed pipe 602, and finally enters the controller 25 through the connecting pipe 26 on the side of the discharge port 603; The demulsifier is analyzed for impurities through the controller 25, and the generated control signal is sent to the motor 23. When the demulsifier contains a large amount of impurities, the motor 23 drives the toothed chain 22 to rotate, and the toothed chain 22 drives the connecting column 21 to move, so as to control the position of the sealing piston 19 in the diverter 18, so that the demulsifier entering the diverter 18 from the controller 25 will enter the filter cartridge 11 through the C port of the diverter 18, and complete the secondary filtration of the demulsifier. When the demulsifier is analyzed in the controller 25 and meets the standards, the motor 23 stops rotating, and the demulsifier entering the diverter 18 begins to squeeze the sealing piston 19, and finally the demulsifier flows from the A port on the diverter 18 into the storage box 2 for storage.

[0018] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0019] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0020] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A circulating liquid filter for preparing and producing demulsifiers, comprising a filter box (1) and a storage box (2), wherein the storage box (2) is installed on one side of the filter box (1), characterized in that: An electric control box (3) is fixed to the top of the filter box (1) by means of bolts, a filter cover (7) is symmetrically mounted on the inner wall of the bottom of the filter box (1), and a pumping mechanism (6) is mounted inside the filter cover (7); A controller (25) and a flow divider (18) are fixed to the top of the storage box (2) by bolts, a motor (23) is fixed to the top of the storage box (2) by bolts, a connecting column (21) is slidably connected inside the flow divider (18), and two ends of the connecting column (21) penetrate two sides of the flow divider (18) and are connected to a toothed chain (22), and a gear connected to the output end of the motor (23) is meshed with the toothed chain (22); The controller (25) comprises a data acquisition unit and a data sub-control unit, wherein the data acquisition unit is used to obtain composite information of the demulsifier after passing through the pumping mechanism (6), and send the composite information to the data sub-control unit, wherein the demulsifier composite information consists of a demulsifier flow rate factor, a demulsifier vibration frequency factor and a demulsifier hydraulic pressure factor; The data sub-control unit is used to obtain composite information after the demulsifier passes through the pumping mechanism (6) and to perform supervision and analysis operations. The specific steps are as follows: Step 1: calibrate the demulsifier flow rate factor, demulsifier vibration frequency factor and demulsifier hydraulic pressure factor in the obtained demulsifier composite information as Pl, Pz and Py; Step 2: According to the formula: , where the demulsifier impurity level R, a1, a2 and a3 are correction factors, and a1>a3>a2>0; Step 3: Compare the demulsifier impurity level R with the demulsifier impurity threshold value r stored in the data sub-control unit, and send the generated control signal to the motor (23): When R ≥ r, a primary control signal is generated; When R<r, a secondary control signal is generated; When the relay in the motor (23) receives the primary control signal, the motor (23) drives the toothed chain (22) to move left and right, and drives the connecting column (21) in the diverter (18) to move left and right; When the relay in the motor (23) receives the secondary control signal, the motor (23) is turned off.

2. The circulating liquid filter for preparing and producing demulsifier according to claim 1, characterized in that: A rotating disk (4) is installed on the top of the electric control box (3), and an arc-shaped cut block (5) is fixedly connected to the bottom of the rotating disk (4); a filter cartridge (11) is installed on the inner wall of the filter box (1), and a second filter screen (12) is installed on the inner wall of the filter cartridge (11); a rotating shaft (13) is installed on the bottom of the electric control box (3), and one end of the rotating shaft (13) passes through the top of the filter box (1) and extends into the filter cartridge (11); a stainless steel brush (14) is fixedly mounted on the rotating shaft (13) in the filter cartridge (11).

3. A circulating liquid filter for preparing and producing demulsifier according to claim 2, characterized in that: The pumping mechanism (6) comprises a movable cover (601), a fixed tube (602), a sealing ball 1 (604) and a sealing ball 2 (605); the bottom of the filter box (1) is fixedly connected to the fixed tube (602) located inside the filter cover (7); feed ports (606) are symmetrically provided on both sides of the fixed tube (602); the upper portion of the fixed tube (602) is slidably connected to the movable cover (601), and a discharge port (603) is provided on one side of the movable cover (601); the movable cover (601) is installed with a sealing ball 1 (604); and the top of the fixed tube (602) is installed with a sealing ball 2 (605).

4. The circulating liquid filter for preparing and producing demulsifier according to claim 3, characterized in that: A filter screen (8) is installed on the outer wall of the filter cover (7), a spring (10) is sleeved and installed inside the filter cover (7) and located on the outer wall of the fixed tube (602), a limit pin (9) is fixed inside the filter cartridge (11) and located at the bottom of the filter box (1), and the limit pin (9) is slidably connected to the movable cover (601).

5. The circulating liquid filter for preparing and producing demulsifier according to claim 4, characterized in that: A liquid level float (15) is installed in the filter box (1); one side of the movable cover (601) passes through the filter box (1) and is slidably connected to the filter box (1); a discharge port (603) on the movable cover (601) is connected to a connecting pipe (26), and one side of the connecting pipe (26) is connected to a controller (25); a sewage pipe (16) is installed on one side of the filter box (1), and one side of the sewage pipe (16) is connected to a filter cartridge (11); and one side of the filter box (1) is connected to a feed pipe (17).

6. The circulating liquid filter for preparing and producing demulsifier according to claim 1, characterized in that: A sealing piston 2 (20) is symmetrically slidably connected inside the flow divider (18); one end of the connecting column (21) passes through the sealing piston 2 (20) and is slidably connected to the sealing piston 2 (20); a sealing piston 1 (19) is sleeved and fixedly mounted on the connecting column (21) on the opposite surfaces of the two sealing pistons 2 (20); a spring 2 (24) is sleeved and mounted on the opposite surfaces of the sealing piston 2 (20) and the inner wall of the flow divider (18) and on the connecting column (21); and one side of the controller (25) is correspondingly connected to the flow divider (18).

7. The circulating liquid filter for preparing and producing demulsifier according to claim 6, characterized in that: The circulating liquid filtration method for preparing and producing the demulsifier is as follows: The demulsifier is discharged into the filter box (1) through the feed pipe (17). When the liquid level float (15) reaches the set height, the liquid is stopped from entering. The electric control box (3) drives the turntable (4) to rotate. The arc-shaped cutout (5) at the bottom of the turntable (4) begins to contact the movable cover (601) in a circular manner. The movable cover (601) is pressed to continuously compress the air in the fixed pipe (602), causing the fixed pipe (602) to start sucking the demulsifier into the filter cover (7). The continuous squeezing causes the demulsifier to enter the fixed pipe (602) and finally enter the controller (25) through the connecting pipe (26) on the side of the discharge port (603). The controller (25) performs an analysis of the impurity content of the demulsifier and sends a generated control signal to the motor (23). When the impurity content of the demulsifier is relatively large, the motor (23) drives the toothed chain (22) to rotate, and the toothed chain (22) drives the connecting column (21) to move, thereby controlling the position of the sealing piston 1 (19) located in the diverter (18). As a result, the demulsifier entering the diverter (18) from the controller (25) enters the filter cartridge (11) through the C port of the diverter (18), thereby completing the secondary filtration of the demulsifier. When the demulsifier is analyzed in the controller (25) and meets the standard, the motor (23) stops rotating, and the demulsifier entering the diverter (18) starts to squeeze the sealing piston 1 (19). Finally, the demulsifier flows from the A port on the diverter (18) into the storage box (2) for storage.

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