A self-regulating mechanical oil-gas-water three-phase separator

Abstract

The present invention relates to the technical field of separators, and specifically to a self-regulating mechanical oil-gas-water three-phase separator, comprising a tank body, an extension tank integrally connected to the bottom of the tank body, an overflow plate fixedly installed inside the extension tank, a feed pipe fixedly connected to one end of the tank body, a drain pipe and an oil drain pipe fixedly connected to the bottom of the extension tank located on both sides of the overflow plate, the drain pipe is located on the side close to the feed pipe, an air outlet pipe is fixedly installed on the top of the tank body, and a mist collector is fixedly connected to the bottom of the air outlet pipe. The present invention sets a floating block that will always be at the oil-water boundary line, that is, the overflow plate will automatically float up to adjust the height, thereby adjusting the oil-water interface height in the three-phase separator, and the overflow plate will provide a buffer space for the crude oil when it floats up, so as to avoid the oil from directly passing through the overflow plate and being discharged when the oil-water interface rises, resulting in an increase in the water content in the oil, thereby ensuring the oil-water separation effect, and the adjustment structure is a floating block, which is durable and not easy to damage.

Description

[0001] This application is a divisional application with the application date of June 18, 2024, application number CN2024107841656, and the invention name is a self-regulating mechanical oil-gas-water three-phase separator. Technical Field

[0002] The invention relates to the technical field of separators, and in particular to a self-regulating mechanical oil-gas-water three-phase separator. Background Art

[0003] As the oil and gas production of major oil fields has entered the middle and late stages, the water content in crude oil is very high. In order to obtain purified crude oil, the oil, gas and water three-phase separator is one of the most common equipment in the oil field development and production process. There are many types of three-phase separators at present, but their basic principle is generally to inject the three-phase mixture into the separator and separate them by using the difference in specific gravity of gas, oil and water. In the oil, gas and water three-phase separation, the control of the oil-water interface is crucial to the oil-water separation effect. Since the oil-water stratification is not a clear interface, the oil near the interface will contain a large amount of water, and similarly, the water near the interface will also contain a large amount of oil. If the oil-water interface is too high, the residence time of the oil phase is reduced, the coalescence time of water droplets in the oil is shortened, and the water content in the crude oil is increased, but the residence time of water in the equipment is increased, which is conducive to reducing the oil content in the water; if the interface is too low, it is conducive to reducing the water content in the oil, but not conducive to the coalescence of oil droplets in the water; therefore, it is necessary to timely analyze the different characteristics of water content in the treated liquid according to the characteristics of oil products in different periods of oil fields. For example, when the water content in the crude oil is large, the oil-water interface will move up, or if there are more solid sediments in the crude oil, the oil-water interface will also rise. If it is not adjusted in time, the residence time of the oil will be reduced and it will be discharged directly through the overflow plate, which will cause the water content in the oil to increase, thereby failing to ensure the oil-water separation effect, and the solid sediments in the separator cannot be processed online;

[0004] For example, a three-phase separator oil-water interface intelligent adjustment device with Chinese patent publication number CN211189201U, by adding an intelligent adjustment device of the oil-water interface to the three-phase separator, can intelligently and efficiently separate oil and water, thereby improving the separation effect of the three-phase separator. Specifically, the oil flow meter and the water flow meter detect the amount of oil and water output, and feed back to the PLC control system. After calculation by the PLC control system, an instruction is issued to adjust the rotation of the servo motor to realize the rotation of the lead screw, and the overflow height of the water weir pipe is adjusted by the lead screw, thereby adjusting the oil-water interface height in the three-phase separator. However, when separating oil and water, it mostly uses electronic detection elements, which are relatively expensive, prone to corrosion failure, and have low durability. Summary of the invention

[0005] The purpose of the present invention is to solve the problems in the background technology and to propose a self-regulating mechanical oil-gas-water three-phase separator.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A self-regulating mechanical oil-gas-water three-phase separator comprises a tank body, the bottom of the tank body is integrally connected to an extension tank, an overflow plate is fixedly installed inside the extension tank, one end of the tank body is fixedly connected to a feed pipe, the bottom of the extension tank located on both sides of the overflow plate is fixedly connected to a drain pipe and an oil drain pipe, the drain pipe is located on the side close to the feed pipe, an air outlet pipe is fixedly installed on the top of the tank body, the bottom of the air outlet pipe is fixedly connected to a mist catcher, a plurality of sewage storage bins are fixedly installed on the bottom of the extension tank, and the bottom of each sewage storage bin is fixedly connected to a sewage discharge structure; the overflow plate comprises a fixed plate and an extension plate, the outer wall of the extension plate is fixedly connected to a floating block, the density of the floating block is between water and oil, the outer wall of the fixed plate is fixedly connected to the inner wall of the extension tank, the extension plate is an "n-shaped" structure, the top of the fixed plate is plugged into the extension plate, and both ends of the extension plate are fixedly connected to a dense The cam is an airtight container, the interior of the cam being connected to a second cam which is in contact with the air filter, the second cam being connected to a second cam which is in contact with the air filter, the second cam being connected to a second cam which is in contact with the air filter, the second cam being connected to a second cam which is in contact with the air filter, the second cam being connected to a second cam which is in contact with the air filter, the second cam being connected to a second cam which is in contact with the air filter, the second cam being connected to a second cam which is in contact with the air filter, the second cam being connected to a second cam which is in contact with the air filter,

[0008] In the above-mentioned self-regulating mechanical oil-gas-water three-phase separator, both the first exhaust pipe and the second exhaust pipe are provided with a spiral structure for easy storage.

[0009] In the above-mentioned self-regulating mechanical oil-gas-water three-phase separator, the sealing structure includes a rib and a sealing sheet. The rib forms a closed structure around the outer edge of the end face of the extension plate. The rib is provided with two circles. One end of the first exhaust pipe and the second exhaust pipe extends between the two circles of ribs. The side of the rib away from the extension plate is fixedly connected with a sealing sheet. The rib is fixedly connected to the middle part of the sealing sheet. Support rollers for support are fixedly installed on both side end faces of the extension plate. A sealing strip is fixedly connected to the bottom edge of the extension plate near the fixed plate.

[0010] In the above-mentioned self-regulating mechanical oil-gas-water three-phase separator, the sewage discharge structure includes a valve body and two first cut-off structures, the two first cut-off structures are fixedly connected to the valve body, a three-way pipe is fixedly connected between the two first cut-off structures, the lower end of the sewage storage bin is fixedly connected to the three-way pipe, and each of the first cut-off structures is fixedly connected to a connecting pipe at one end away from the three-way pipe, and a gas pipe joint is installed at one end of one of the connecting pipes.

[0011] In the above-mentioned self-regulating mechanical oil-gas-water three-phase separator, a partition is fixedly connected to the interior of the first cut-off structure, and the interior of the first cut-off structure is divided into two parts, a first flow channel and a second flow channel, by the partition. The first flow channel is connected to the second flow channel, and the interior of the valve body is movably connected to a piston plate for sealing the first flow channel.

[0012] In the above-mentioned self-regulating mechanical oil-gas-water three-phase separator, a connecting plate is arranged inside the valve body, and a telescopic push rod is fixedly connected to one end of the valve body away from the first truncation structure, and the extended end of the telescopic push rod is fixedly connected to the outer wall of the connecting plate, and two connecting rods are fixedly connected to one end of the connecting plate away from the telescopic push rod, and one end of the connecting rod away from the connecting plate is fixedly connected to the outer wall of the piston plate.

[0013] In the above-mentioned self-regulating mechanical oil-gas-water three-phase separator, the connecting rod includes an outer rod and an inner sliding rod, the outer wall of the inner sliding rod is slidably connected to the inner wall of the outer rod, the end of the outer rod away from the piston plate is fixedly connected to a spring, the end of the spring away from the outer rod is fixedly connected to the outer wall of the connecting plate, the outer wall of the inner sliding rod is fixedly connected to a plurality of elastic ropes, the end of the elastic rope away from the inner sliding rod is fixedly connected to a conical block, the conical block is clamped on the outside of the spring, the outer wall of the sewage storage bin is fixedly connected to a rubber pad, and the sewage storage bin is fixedly connected to the extension tank through the rubber pad.

[0014] In the above-mentioned self-regulating mechanical oil-gas-water three-phase separator, the bottom of the extension tank is fixedly connected to a base for support, the inside of the tank body close to the feed pipe is fixedly connected to a material baffle, and the inner wall of the extension tank is fixedly connected to a plurality of wave-breaking plates, and the wave-breaking plates are arc-shaped sheet structures.

[0015] Compared with the existing technology, the advantages of this self-regulating mechanical oil-gas-water three-phase separator are:

[0016] 1. Since the density of the floating block is between that of water and oil, the floating block will always be at the oil-water boundary, that is, the overflow plate will automatically float up and adjust the height, thereby adjusting the oil-water interface height in the three-phase separator. When the overflow plate floats up, it will provide a buffer space for the crude oil to avoid the oil from directly passing through the overflow plate and being discharged when the oil-water interface rises due to insufficient residence time, resulting in an increase in the water content in the oil, thereby ensuring the oil-water separation effect. The adjustment structure is a floating block, which is durable and not easy to damage;

[0017] 2. The support roller is used for support to avoid the problem of large friction caused by direct contact between the extension plate and the extension tank, which makes it difficult to move the extension plate. When the extension plate floats upward, the piston rod will also move upward with the extension plate, and the piston on the piston rod will squeeze the air at the top of the air pressure groove. The gas is discharged between the two flanges through the second exhaust pipe, so that the sealing sheet will be pressed against the inner wall of the extension tank. When the extension plate floats downward, gas can also be added between the two flanges, thereby ensuring the sealing between the extension plate and the extension tank, preventing the crude oil from leaking out from the connection between the extension plate and the extension tank during adjustment, ensuring the sealing during adjustment, and preventing the mixing of oil and water during separation;

[0018] 3. The telescopic push rod is shortened to drive the connecting plate to move, and the connecting plate drives the inner slide rod to extend along the outer rod. At this time, the spring will gradually expand, and the tapered block will be stuck between the springs under the tension of the elastic rope. Then the inner slide rod drives the outer rod and the piston plate to move together, so that the first flow channel and the second flow channel are connected, that is, the two first truncation structures are connected, and the gas inside the high-pressure air pipe will pass through the connecting pipe and the first truncation structure, flow through the three-way pipe, and then be discharged from the other connecting pipe. At the same time, the solid sediment deposited in the sewage storage bin will be discharged together, so as to achieve the effect of conveniently cleaning the solid sediment inside the extension tank;

[0019] 4. Due to the setting of the conical block and the elastic rope, when the telescopic push rod is extended and the piston plate blocks the first flow channel, the connecting plate will squeeze the spring, making the pitch of the spring smaller, and then compressing the conical block. The conical block is a truncated cone structure. Under the continuous squeezing of the spring, the conical block will be squeezed out, and the springs will lose support and collide with each other, causing the entire sewage discharge structure to vibrate. The provision of an elastic rubber pad will enable the sewage discharge structure to vibrate for a long time and drive the oil drain pipe to vibrate accordingly, so that the oil drain pipe will vibrate after each cleaning, causing the sediment remaining on the inner wall of the oil drain pipe to fall off under the vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0021] Figure 2 It is a half-section schematic diagram of the present invention;

[0022] Figure 3 The present invention Figure 2 A schematic diagram of the structure enlargement at the center A;

[0023] Figure 4 The present invention Figure 2 A schematic diagram of the structure enlarged at B in the middle;

[0024] Figure 5 It is a three-dimensional structural schematic diagram of the partition of the present invention;

[0025] Figure 6 is a cross-sectional schematic diagram of the sealing structure of the present invention;

[0026] Figure 7 It is an enlarged schematic diagram of the structure of the fixing plate of the present invention;

[0027] Figure 8 It is a schematic cross-sectional view of the structure of the fixing plate of the present invention;

[0028] Fig. 9 is an enlarged schematic diagram of the sewage discharge structure of the present invention;

[0029] Fig.10 is a cross-sectional view of the sewage discharge structure of the present invention;

[0030] Fig.11 The present invention Fig.10 Enlarged schematic diagram of the structure at C in the middle.

[0031] In the figure: 1, tank body; 2, extension tank; 3, feed pipe; 4, drain pipe; 5, oil drain pipe; 6, outlet pipe; 7, overflow plate; 8, sewage discharge structure; 9, base; 10, fixed plate; 11, extension plate; 12, sealing structure; 13, support roller; 14, floating block; 15, air pressure groove; 16, constant pressure pipe; 17, piston rod; 18, first exhaust pipe; 19, second exhaust pipe; 20, first intake pipe; 21, second intake pipe; 22, retaining edge; 23, sealing sheet; 2 4. Valve body; 25. First truncation structure; 26. Connecting pipe; 27. Tee pipe; 28. Air pipe joint; 29. ​​Partition; 30. First flow channel; 31. Second flow channel; 32. Piston plate; 33. Connecting rod; 34. Connecting plate; 35. Telescopic push rod; 36. Outer rod; 37. Inner slide rod; 38. Spring; 39. Dirt storage bin; 40. Rubber pad; 41. Material retaining plate; 42. Wave-breaking plate; 43. Mist catcher; 44. Conical block; 45. Elastic rope; 46. Sealing strip. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] Reference Figure 1-Figure 11A self-regulating mechanical oil-gas-water three-phase separator comprises a tank body 1, an extension tank 2 is integrally connected to the bottom of the tank body 1, an overflow plate 7 is fixedly installed inside the extension tank 2, a feed pipe 3 is fixedly connected to one end of the tank body 1, a drain pipe 4 and an oil drain pipe 5 are fixedly connected to the bottom of the extension tank 2 located on both sides of the overflow plate 7, the drain pipe 4 is located on the side close to the feed pipe 3, an air outlet pipe 6 is fixedly installed on the top of the tank body 1, a mist collector 43 is fixedly connected to the bottom of the air outlet pipe 6, a plurality of sewage storage bins 39 are fixedly installed at the bottom of the extension tank 2, and a sewage discharge structure 8 is fixedly connected to the bottom of each sewage storage bin 39; the overflow plate 7 comprises a fixed plate 10 and an extension plate 11 The outer wall of the extension plate 11 is fixedly connected with a floating block 14, the density of the floating block 14 is between that of water and oil, the outer wall of the fixed plate 10 is fixedly connected with the inner wall of the extension tank 2, the extension plate 11 is an "n-shaped" structure, the top of the fixed plate 10 is plugged with the extension plate 11, both ends of the extension plate 11 are fixedly connected with a sealing structure 12, the sealing structure 12 is in contact with the inner wall of the extension tank 2, the interior of the fixed plate 10 is provided with two vertically arranged air pressure grooves 15, the inner wall of the air pressure groove 15 is slidably connected with a piston rod 17, the upper end of the piston rod 17 is fixedly connected with the extension plate 11, and the top of each air pressure groove 15 is connected with a second exhaust pipe 19 and a second intake pipe 2 1, the bottom of each air pressure groove 15 is connected to a first exhaust pipe 18 and a first intake pipe 20, the ends of the first exhaust pipe 18 and the second exhaust pipe 19 away from the air pressure groove 15 are connected to the inside of the sealing structure 12, the ends of the first intake pipe 20 and the second intake pipe 21 away from the air pressure groove 15 extend to the outside of the extension tank 2, the first exhaust pipe 18 and the second exhaust pipe 19 are both equipped with a one-way valve that conducts from the air pressure groove 15 to the outside, and the first intake pipe 20 and the second intake pipe 21 are both equipped with a one-way valve that conducts from the outside to the inside of the air pressure groove 15, and the interior of the fixed plate 10 is fixedly connected to a vertically arranged constant pressure pipe 16, and the upper end of the constant pressure pipe 16 is connected to It passes through the top of the fixed plate 10, and the lower end of the constant pressure tube 16 extends to the outside of the extension tank 2. The sealing structure 12 includes a rib 22 and a sealing sheet 23. The rib 22 forms a closed structure around the outer edge of the end face of the extension plate 11. The rib 22 is provided with two circles. One end of the first exhaust pipe 18 and the second exhaust pipe 19 extends between the two circles of ribs 22. The side of the rib 22 away from the extension plate 11 is fixedly connected with the sealing sheet 23, and the rib 22 is fixedly connected to the middle part of the sealing sheet 23. Support rollers 13 for support are fixedly installed on the end faces of both sides of the extension plate 11, and a sealing strip 46 is fixedly connected to the bottom edge of the extension plate 11 near the fixed plate 10.

[0035] When in use, crude oil is injected from the feed pipe 3, and the interior of the crude oil flow channel extension tank 2 undergoes preliminary sedimentation. According to the water content in the crude oil, the density of the float 14 is between that of water and oil. The float 14 can be polyethylene or polypropylene. The float 14 will always be at the oil-water boundary line, that is, the overflow plate 7 will automatically float up to adjust the height, thereby adjusting the oil-water interface height in the three-phase separator, and when the extension plate 11 floats upward, the piston rod 17 will also move upward with the extension plate 11, and the piston on the piston rod 17 will squeeze the air at the top of the air pressure groove 15, and the gas will be discharged between the two ribs 22 through the second exhaust pipe 19, so that the sealing sheet 23 will be pressed against the inner wall of the extension tank 2, thereby ensuring the sealing between the extension plate 11 and the extension tank 2, and preventing the crude oil from leaking out from the connection between the extension plate 11 and the extension tank 2 during adjustment, thereby ensuring the sealing during adjustment, and preventing the separation during adjustment. The oil and water are mixed, and at the same time, the first air inlet pipe 20 can replenish air to the bottom of the air pressure groove 15 to prevent the vacuum at the bottom of the air pressure groove 15 from being difficult to move. When the piston rod 17 moves downward, the piston on the piston rod 17 will also squeeze the gas at the bottom of the air pressure groove 15 and discharge it from the first exhaust pipe 18 to between the two ribs 22. The second air inlet pipe 21 is used to replenish gas to the top of the air pressure groove 15. Moreover, the unique design of the sealing structure 12 and the support roller 13 are used for support to avoid the large friction caused by the direct contact between the extension plate 11 and the extension tank 2, and the problem that the extension plate 11 is difficult to move. The extension plate 11 can replenish gas between the two ribs 22 for sealing when it moves up and down, thereby ensuring the sealing between the extension plate 11 and the extension tank 2 when it floats, and the excess gas filled between the two ribs 22 will be discharged from the sealing plate 23, and the air pressure inside the rib 22 is kept constant.

[0036] Among them, the first exhaust pipe 18 and the second exhaust pipe 19 are both provided with a spiral structure for easy storage. When the extension plate 11 moves up and down, the spring-like spiral structure on the first exhaust pipe 18 and the second exhaust pipe 19 can expand or contract to facilitate the storage of the first exhaust pipe 18 and the second exhaust pipe 19 while ensuring stable gas transmission.

[0037] Among them, the sewage discharge structure 8 includes a valve body 24 and two first truncation structures 25, the two first truncation structures 25 are fixedly connected to the valve body 24, a three-way pipe 27 is fixedly connected between the two first truncation structures 25, the lower end of the sewage storage bin 39 is fixedly connected to the three-way pipe 27, and each first truncation structure 25 is fixedly connected to a connecting pipe 26 at one end away from the three-way pipe 27, and a trachea joint 28 is installed at one end of one of the connecting pipes 26, and a high-pressure trachea is connected to the trachea joint 28, and a partition 29 is fixedly connected to the inside of the first truncation structure 25, and the inside of the first truncation structure 25 is divided into a first flow channel 30 and a second flow channel 31 by the partition 29, and the first flow channel 30 is connected to the second flow channel 31, and the inside of the valve body 24 is movably connected with a piston plate 32 for blocking the first flow channel 30, and a connecting plate 34 is arranged inside the valve body 24, and the end of the valve body 24 away from the first truncation structure 25 is fixed The cam 35 has two cams 36 that are connected to the rear of the vehicle 30 and the rear of the vehicle 30. The cam 35 has two cams 36 that are connected to the rear of the vehicle 30 and the rear of the vehicle 30. The cam 35 has two cams 36 that are connected to the rear of the vehicle 30 and the rear of the vehicle 30.

[0038] When in use, the fixed sediment inside the extension tank 2 will be deposited inside the sewage storage bin 39. When it needs to be cleaned, the telescopic push rod 35 is shortened to drive the connecting plate 34 to move, and the connecting plate 34 drives the inner slide rod 37 to extend along the outer rod 36. At this time, the spring 38 will gradually extend, and the conical block 44 will be stuck between the springs 38 under the tension of the elastic rope 45. Then the inner slide rod 37 drives the outer rod 36 and the piston plate 32 to move together, so that the first flow channel 30 and the second flow channel 31 are connected, that is, the two first truncation structures 25 are connected, and the gas inside the high-pressure air pipe will pass through the connecting pipe 26 and the first truncation structure 25, flow through the three-way pipe 27, and then be discharged from the other connecting pipe 26. At the same time, the solid sediment deposited in the sewage storage bin 39 will be discharged together, so that the solid sediment inside the extension tank 2 can be easily cleaned. After the cleaning is completed, the telescopic push rod 35 can be re-extended so that the piston plate 32 can re-block the first flow channel 30. Due to the arrangement of the conical block 44 and the elastic rope 45, when the telescopic push rod 35 is extended and the piston plate 32 blocks the first flow channel 30, the connecting plate 34 will squeeze the spring 38, so that the pitch of the spring 38 becomes smaller, thereby pressing the conical block 44. The conical block 44 is a truncated cone structure. Under the continuous squeezing of the spring 38, the conical block 44 will be squeezed out, and the spring 38 will lose its support and collide with each other, causing the entire sewage discharge structure 8 to vibrate. Fig.10 , Fig.11 The piston plate 32 blocks the first flow channel 30, and the conical block 44 is stuck between the springs 38 and is not squeezed out. As the telescopic push rod 35 continues to extend, the pitch of the spring 38 becomes smaller, and the conical block 44 will be squeezed out. The provision of an elastic rubber pad 40 will enable the sewage discharge structure 8 to vibrate for a long time and drive the oil drain pipe 5 to vibrate accordingly, so that the oil drain pipe 5 will vibrate after each cleaning, so that the sediment remaining on the inner wall of the oil drain pipe 5 will fall off under the vibration.

[0039] Among them, the bottom of the extension tank 2 is fixedly connected to a base 9 for support, and the side of the tank body 1 close to the feed pipe 3 is fixedly connected to a material blocking plate 41, wherein the setting of the material blocking plate 41 can block the crude oil, disperse the crude oil, and promote the separation of solid, liquid and gas. The inner wall of the extension tank 2 is fixedly connected to a plurality of wave-breaking plates 42, and the wave-breaking plates 42 are in an arc-shaped sheet structure. The arc-shaped structure makes it easier for the solid sediment flowing through to settle in the middle of the extension tank 2, so as to be collected by the oil discharge pipe 5.

[0040] It is further explained that the above-mentioned fixed connection should be understood in a broad sense unless otherwise clearly specified and limited. For example, it can be welding, gluing, or one-piece molding, etc., which are conventional means well known to those skilled in the art.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A self-regulating mechanical oil-gas-water three-phase separator, characterized in that: The invention comprises a tank body (1), the bottom of the tank body (1) is integrally connected with an extension tank (2), an overflow plate (7) is fixedly installed inside the extension tank (2), one end of the tank body (1) is fixedly connected with a feed pipe (3), the bottom of the extension tank (2) located on both sides of the overflow plate (7) is fixedly connected with a drain pipe (4) and an oil drain pipe (5), the drain pipe (4) is located on the side close to the feed pipe (3), the top of the tank body (1) is fixedly installed with an air outlet pipe (6), the bottom of the air outlet pipe (6) is fixedly connected with a mist collector (43), the bottom of the extension tank (2) is fixedly installed with a plurality of sewage storage bins (39), and the bottom of each sewage storage bin (39) is fixedly connected with a sewage discharge structure (8); The overflow plate (7) comprises a fixed plate (10) and an extension plate (11). The outer wall of the extension plate (11) is fixedly connected with a floating block (14). The density of the floating block (14) is between that of water and oil. The outer wall of the fixed plate (10) is fixedly connected with the inner wall of the extension tank (2). The extension plate (11) is an "n-shaped" structure. The top of the fixed plate (10) is plugged into the extension plate (11). Both ends of the extension plate (11) are fixedly connected with a sealing structure (12). Two vertically arranged air pressure grooves (15) are provided inside the fixed plate (10). The inner wall of the air pressure groove (15) is slidably connected with a piston rod (17). The upper end of the piston rod (17) is fixedly connected with the extension plate (11). The top of each of the air pressure grooves (15) is connected with a second exhaust pipe (19) and a second intake pipe (21). Each of the air pressure grooves (15) has a second exhaust pipe (19) and a second intake pipe (21). The bottom of the extension tank (2) is connected to a first exhaust pipe (18) and a first intake pipe (20); one end of the first exhaust pipe (18) and the second exhaust pipe (19) away from the air pressure groove (15) is connected to the inside of the sealing structure (12); one end of the first intake pipe (20) and the second intake pipe (21) away from the air pressure groove (15) extends to the outside of the extension tank (2); the first exhaust pipe (18) and the second exhaust pipe (19) are both equipped with a one-way valve that conducts from the air pressure groove (15) to the outside; the first intake pipe (20) and the second intake pipe (21) are both equipped with a one-way valve that conducts from the outside to the inside of the air pressure groove (15); the interior of the fixing plate (10) is fixedly connected to a vertically arranged constant pressure pipe (16); the upper end of the constant pressure pipe (16) is connected to the top of the fixing plate (10), and the lower end of the constant pressure pipe (16) extends to the outside of the extension tank (2); The sealing structure (12) comprises a rib (22) and a sealing sheet (23), wherein the rib (22) surrounds the outer edge of the end surface of the extension plate (11) to form a closed structure, the rib (22) is provided with two circles, one end of the first exhaust pipe (18) and the second exhaust pipe (19) extend between the two circles of ribs (22), a sealing sheet (23) is fixedly connected to the side of the rib (22) away from the extension plate (11), the rib (22) is fixedly connected to the middle part of the sealing sheet (23), support rollers (13) for support are fixedly installed on both side end surfaces of the extension plate (11), and a sealing strip (46) is fixedly connected to the bottom edge of the extension plate (11) close to the fixed plate (10); The sewage discharge structure (8) comprises a valve body (24) and two first cut-off structures (25), the two first cut-off structures (25) are fixedly connected to the valve body (24), a three-way pipe (27) is fixedly connected between the two first cut-off structures (25), the lower end of the sewage storage bin (39) is fixedly connected to the three-way pipe (27), and one end of each of the first cut-off structures (25) away from the three-way pipe (27) is fixedly connected to a connecting pipe (26), and one end of one of the connecting pipes (26) is installed with an air pipe joint (28); A partition plate (29) is fixedly connected to the interior of the first cut-off structure (25); the interior of the first cut-off structure (25) is divided into two parts, a first flow channel (30) and a second flow channel (31), by the partition plate (29); the first flow channel (30) is connected to the second flow channel (31); and a piston plate (32) for blocking the first flow channel (30) is movably connected to the interior of the valve body (24); The first exhaust pipe (18) and the second exhaust pipe (19) are both provided with a spiral structure that is convenient for storage; A connecting plate (34) is arranged inside the valve body (24); a telescopic push rod (35) is fixedly connected to one end of the valve body (24) away from the first truncation structure (25); an extended end of the telescopic push rod (35) is fixedly connected to the outer wall of the connecting plate (34); an end of the connecting plate (34) away from the telescopic push rod (35) is fixedly connected to two connecting rods (33); an end of the connecting rod (33) away from the connecting plate (34) is fixedly connected to the outer wall of the piston plate (32).

2. A self-regulating mechanical oil-gas-water three-phase separator according to claim 1, characterized in that: The connecting rod (33) comprises an outer rod (36) and an inner slide rod (37), the outer wall of the inner slide rod (37) is slidably connected to the inner wall of the outer rod (36), one end of the outer rod (36) away from the piston plate (32) is fixedly connected to a spring (38), one end of the spring (38) away from the outer rod (36) is fixedly connected to the outer wall of the connecting plate (34), the outer wall of the inner slide rod (37) is fixedly connected to a plurality of elastic ropes (45), one end of the elastic rope (45) away from the inner slide rod (37) is fixedly connected to a conical block (44), and the conical block (44) is clamped on the outer side of the spring (38), the outer wall of the dirt storage bin (39) is fixedly connected to a rubber pad (40), and the dirt storage bin (39) is fixedly connected to the extension tank (2) through the rubber pad (40).

3. A self-regulating mechanical oil-gas-water three-phase separator according to claim 2, characterized in that: The bottom of the extension tank (2) is fixedly connected to a base (9) for support, the inside of the tank body (1) close to the feeding pipe (3) is fixedly connected to a material blocking plate (41), and the inner wall of the extension tank (2) is fixedly connected to a plurality of wave-breaking plates (42), and the wave-breaking plates (42) are in the form of an arc-shaped sheet structure.

Images