Device for filtering oily sewage

Abstract

The utility model provides a device for filtering oily sewage. The device comprises a box body and an oil filtering mechanism arranged in the box body. Wherein the box body is provided with a liquid inlet, the liquid inlet penetrates through the wall face of the box body, is opposite to the oil filtering mechanism and is used for enabling fluid to move to the oil filtering mechanism along the liquid inlet so as to filter oil of the fluid, and the box body is further provided with an oil outlet pipe communicated with the interior of the box body. And the oil outlet pipe is configured to allow the oil filtered by the oil filtering mechanism to pass through. By means of the arrangement mode, the technical problems that in the prior art, the treatment period is long, and oil liquid is difficult to collect are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment, and particularly relates to a device for filtering oily sewage. Background Art

[0002] During oil and gas exploitation, it is often necessary to inject water into the oil layer in the well to maintain the formation pressure and improve the recovery rate. In this exploitation mode, a large amount of sewage to be treated will be generated at the exploitation site, and the sewage generally contains oil liquid, solid particles, etc.

[0003] In the prior art, the solid particles contained in the sewage are mainly settled to sink, and the oil liquid floats, so that the sewage can be stratified. Thus, the sewage is treated. In this way, although the sewage can be effectively treated, the treatment cycle is long and it is difficult to collect the oil liquid. Summary of the Utility Model

[0004] To overcome at least one or more of the above-mentioned defects in the prior art, the utility model provides a device for filtering oily sewage, which includes a box body and an oil filtering mechanism arranged in the box body.

[0005] Wherein, a liquid inlet is arranged on the box body, and the liquid inlet penetrates through the wall surface of the box body and faces the oil filtering mechanism, so as to enable the fluid to move along the liquid inlet to the oil filtering mechanism, thereby filtering the oil of the fluid.

[0006] An oil outlet pipe communicated with the inside of the box body is further arranged on the box body, and the oil outlet pipe is configured to allow the oil liquid filtered by the oil filtering mechanism to pass through.

[0007] In one embodiment, a liquid outlet pipe communicated with the inside of the box body is further arranged on the box body, and the liquid outlet pipe is configured to allow the fluid filtered by the oil filtering mechanism to pass through.

[0008] In one embodiment, the oil filtering mechanism includes a first oil filtering component, and the first oil filtering component includes an oil filtering tank arranged on the inner wall of the box body and extending horizontally for filtering the oil liquid in the fluid, and a diversion plate arranged below the oil filtering tank and inclined from the free end of the oil filtering tank to the inner wall of the box body, and the oil outlet pipe is arranged between the oil filtering tank and the diversion plate.

[0009] In one embodiment, the oil filtering mechanism further includes a second oil filtering component arranged below the first oil filtering component, and the second oil filtering component is configured to have the same structure as the first oil filtering component, but the horizontal extension distance of the second oil filtering component is greater than that of the first oil filtering component, and is used for receiving the fluid that overflows along the first oil filtering component and is filtered by the first oil filtering component.

[0010] In one embodiment, the oil filtering mechanism further includes a third oil filtering component disposed below the second oil filtering component. The third oil filtering component is configured to have the same structure as the second oil filtering component, but the lateral extension distance of the third oil filtering component is greater than that of the second oil filtering component, and is used to receive the fluid that has passed through the second oil filtering component and overflows along the second oil filtering component.

[0011] In one embodiment, three outlet pipes are provided, which are respectively used to discharge the oil filtered by the first oil filtering component, the second oil filtering component, and the third oil filtering component.

[0012] In one embodiment, the device further includes a filtering mechanism disposed at the liquid inlet for preliminarily filtering impurities in the fluid.

[0013] In one embodiment, the filtering mechanism includes a liquid inlet hopper, at least one filtering component, and a fixing member connected in sequence. The fixing member is used to connect to the liquid inlet.

[0014] In one embodiment, the device further includes a stirring chamber located below the liquid inlet and defined along the liquid inlet, which is used to accommodate the fluid filtered by the filtering mechanism. A stirring mechanism for stirring the fluid to prevent fluid stratification is disposed in the stirring chamber. A liquid flow pipe communicating with the stirring chamber is further disposed on the stirring chamber, and the free end of the liquid flow pipe extends to the first oil filtering component.

[0015] In one embodiment, the stirring mechanism includes a stirring shaft disposed in the stirring chamber and a driving mechanism located at the free end of the stirring shaft for driving the stirring shaft to rotate in the stirring chamber.

[0016] Generally speaking, compared with the prior art by the above technical solutions conceived by the present utility model, the following beneficial effects can be achieved:

[0017] In the present utility model, a box body is provided, and an oil filtering mechanism located in the box body, and a liquid inlet opposite to the oil filtering mechanism is provided on the box body. At the same time, an outlet pipe communicating with the inside of the box body is provided on the box body, and the outlet pipe is configured to allow the oil filtered by the oil filtering mechanism to pass through. In this way, when processing the fluid, the fluid can be made to move along the liquid inlet to the oil filtering mechanism, so that the oil in the fluid can be filtered out by the oil filtering mechanism, and the filtered oil can move along the outlet pipe to the outside. Thus, the oil can be collected. In this setting mode, the technical problems of long processing cycle and difficult oil collection in the prior art are solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The embodiments of the present utility model will be described in detail below with reference to the drawings. In the drawings:

[0019] Figure 1 Schematically shows the overall structure of the device for filtering oily sewage according to the present utility model;

[0020] Figure 2 Schematically shows the overall sectional structure of the device for filtering oily sewage according to the present utility model;

[0021] Figure 3 Schematically shows the overall structure of the filtering mechanism of the device for filtering oily sewage according to the present utility model.

[0022] It should be noted that the drawings are not necessarily drawn to actual scale.

[0023] In all the drawings, the same reference numerals represent the same technical features, specifically: 100 - device for filtering oily sewage; 1 - box body; 11 - liquid inlet; 12 - oil outlet pipe; 13 - bottom plate; 14 - side plate; 15 - cover plate; 16 - chamber; 17 - liquid outlet pipe; 18 - support leg; 2 - oil filtering mechanism; 21 - first oil filtering component; 211 - oil filtering tank; 212 - diversion plate; 22 - second oil filtering component; 23 - third oil filtering component; 3 - collection mechanism; 31 - placement plate; 32 - collection box; 4 - filtering mechanism; 41 - fixing member; 411 - first groove; 42 - liquid inlet hopper; 421 - handle; 43 - filtering component; 431 - insertion part; 432 - filter screen; 433 - second groove; 5 - stirring chamber; 51 - liquid flow pipe; 6 - stirring mechanism; 61 - stirring shaft; 62 - driving mechanism; 63 - support seat 631 - support plate; 632 - reinforcing rib. Detailed implementation manners

[0024] In order to better understand the purpose, structure and function of the present utility model, the following further describes in detail a device for filtering oily sewage according to the present utility model with reference to the drawings.

[0025] As Figure 1 shown, an embodiment of the present utility model provides a device 100 for filtering oily sewage, including a box body 1, an oil filtering mechanism 2 arranged in the box body 1, and a liquid inlet 11 opened on the box body 1 and communicating with the inside of the box body 1. In this embodiment, the liquid inlet 11 is arranged above the oil filtering mechanism 2 and allows the fluid entering the box body 1 along the liquid inlet 11 to move onto the oil filtering mechanism 2, so as to filter the oil contained in the fluid. Among them, an oil outlet pipe 12 is further arranged on the box body 1 for conveying the oil filtered by the oil filtering mechanism 2.

[0026] In this way, the fluid can move along the liquid inlet 11 into the box body 1, and after passing through the oil filtering mechanism 2, it is discharged along the oil outlet pipe 12. Thus, the oil contained in the fluid is filtered out, and the treatment of oily sewage is completed.

[0027] In one embodiment, as Figure 2 shown, the box body 1 includes a bottom plate 13 and side plates 14 provided on the bottom plate 13 and extending upward. The side plates 14 enclose with the bottom plate to form a structure with an open top and a hollow interior. Among them, a cover plate 15 is provided at the open top. In this way, the bottom plate 13, the side plates 14 and the cover plate 15 jointly define a chamber 16 for accommodating the fluid.

[0028] At the same time, as Figure 2 shown, the liquid inlet 11 is provided on the cover plate 15 and penetrates through the cover plate 15 to communicate with the chamber 16. The oil filtering mechanism 2 is provided on the side plate 14 and is opposite to the liquid inlet 11. In this way, the fluid can enter the chamber 16 along the liquid inlet 11 and fall on the oil filtering mechanism 2, so that the oil in the fluid is filtered by the oil filtering mechanism 2.

[0029] In one embodiment, as Figure 2 shown, the device 100 further includes a liquid outlet pipe 17 connected to the chamber 16. The liquid outlet pipe 17 is configured to allow the fluid filtered by the oil filtering mechanism 2 to pass through and be discharged to the outside. In this setting, the fluid can move along the liquid inlet 11 into the chamber 16, and after passing through the oil filtering mechanism 2, the oil is discharged along the oil outlet pipe 12. At the same time, the fluid filtered by the oil filtering mechanism 2 will be discharged through the liquid outlet pipe 17. Thus, the oil contained in the fluid is filtered out, and the treatment of oily sewage is completed.

[0030] In one embodiment, as Figure 2 shown, the oil filtering mechanism 2 includes a first oil filtering component 21. The first oil filtering component 21 includes an oil filtering tank 211 provided on the side plate 14 and extending horizontally, and a diversion plate 212 provided below the oil filtering tank 211. One side of the diversion plate 212 is connected to the side plate 14, and the other side extends to the free end of the oil filtering tank 211.

[0031] Among them, as Figure 2As shown, the oil filter tank 211 includes an oil filter plate connected to the side plate 14 for filtering oil, and a connecting plate disposed along the circumference of the oil filter plate and extending upward. Preferably, a hydrophobic and oleophilic membrane is provided on the oil filter plate. In this way, the oil filter plate and the connecting plate together form a space for accommodating fluid, and when the fluid is located in the oil filter tank 211, it moves downward under the action of gravity, and thus is filtered through the oil filter plate and the hydrophobic and oleophilic membrane on the oil filter plate.

[0032] At the same time, as Figure 2 shown, the deflector plate 212 is connected to the oil filter tank 211 in an inclined manner for receiving the oil flowing down along the oil filter plate. In this way, a triangular cavity for accommodating oil is formed between the oil filter tank 211 and the deflector plate 212, and the oil moves along the deflector plate 212 in the triangular cavity.

[0033] In this embodiment, as Figure 2 shown, the outlet pipe 12 is disposed between the oil filter tank 211 and the deflector plate 212 and is in communication with the triangular cavity. In this way, the fluid entering the chamber 16 along the inlet 11 can first be located in the oil filter tank 211, and the oil in the fluid is filtered out by the oil filter tank 211, and the filtered oil moves downward onto the deflector plate 212, and thus is discharged from the outlet pipe 12 under the guiding action of the deflector plate 212.

[0034] In this setting mode, during use, the fluid to be filtered is input along the inlet 11. At this time, the fluid will move downward into the oil filter tank 211, and the oil in the fluid is filtered out by the oil filter tank 211, and the oil moves downward. During this process, the oil will move into the triangular cavity formed by the oil filter tank 211 and the deflector plate 212 and move along the deflector plate 212 in the cavity, and thus is discharged along the outlet pipe 12.

[0035] At the same time, as the fluid continuously enters the oil filter tank 211 along the inlet 11, the fluid from which the oil has been filtered by the oil filter tank 211 will continuously accumulate in the oil filter tank 211 until the height of the fluid from which the oil has been filtered in the oil filter tank 211 is greater than the connecting plate, and thus overflows from the oil filter tank 211 and moves into the chamber 16, and moves along the outlet pipe 17 to the outside in the chamber 16. Thus, the treatment of the oily sewage is completed.

[0036] In one embodiment, as Figure 2As shown, the oil filtering mechanism 2 further includes a second oil filtering component 22 disposed below the first oil filtering component 21. The difference between the second oil filtering component 22 and the first oil filtering component 21 is only that the lateral length of the second oil filtering component 22 is greater than that of the first oil filtering component 21. In this way, the fluid that overflows along the first oil filtering component 21 and has been filtered by the first oil filtering component 21 will move into the second oil filtering component 22, so that the fluid is filtered again by the second oil filtering component 22. Thus, the oil contained in the fluid can be further filtered out.

[0037] In one embodiment, as Figure 2 shown, the oil filtering mechanism 2 further includes a third oil filtering component 23 disposed below the second oil filtering component 22. The difference between the third oil filtering component 23 and the second oil filtering component 22 is only that the lateral length of the third oil filtering component 23 is greater than that of the second oil filtering component 22. In this way, the fluid that overflows along the second oil filtering component 22 and has been filtered by the second oil filtering component 22 will move into the third oil filtering component 23, so that the fluid is filtered again by the third oil filtering component 23. Thus, the oil contained in the fluid can be further filtered out.

[0038] It should be noted that, as Figure 2 shown, the oil outlet pipe 12 is provided in three and corresponds to the first oil filtering component 21, the second oil filtering component 22, and the third oil filtering component 23 respectively, so as to be respectively used for discharging the oil discharged through the first oil filtering component 21, the second oil filtering component 22, and the third oil filtering component 23.

[0039] In this setting mode, during use, the fluid to be filtered is input along the liquid inlet 11. At this time, the fluid will move downward into the first oil filtering component 21, and the oil in the fluid is filtered out by the first oil filtering component 21 and the oil moves downward, so as to be discharged along the oil outlet pipe 12.

[0040] At the same time, as the fluid continuously enters the first oil filtering component 21 along the liquid inlet 11, the fluid from which the oil has been filtered by the first oil filtering component 21 will continuously accumulate in the first oil filtering component 21 until the fluid from which the oil has been filtered overflows from the first oil filtering component 21 and moves into the second oil filtering component 22, and the oil in the fluid is filtered out by the second oil filtering component 22 and the oil moves downward, so as to be discharged along the oil outlet pipe 12.

[0041] In addition, as the fluid continuously rises within the second oil filtering assembly 22, the fluid will overflow from the second oil filtering assembly 22 and thus move into the third oil filtering assembly 23. The oil in the fluid will be filtered out by the third oil filtering assembly 23 and the oil will move downward and be discharged along the oil outlet pipe 12. In this way, three oil filtering operations can be performed on the fluid.

[0042] Moreover, as the fluid continuously enters from the liquid inlet 11, the fluid located in the third oil filtering assembly 23 will continuously overflow and move into the chamber 16, and move to the outside along the liquid outlet pipe 17 in the chamber 16. Thus, the treatment of the oily sewage is completed.

[0043] According to a preferred embodiment of the present invention, as Figure 2 shown, a collection mechanism 3 for collecting oil is further provided on the casing 1. The collection mechanism 3 includes a placement plate 31 provided on the casing 1 and extending outward, and a collection box 32 provided on the placement plate 31. Among them, the collection box 32 is configured to have an open top and a hollow interior structure capable of accommodating oil. In this embodiment, the opening of the collection box 32 is provided below the oil outlet pipe 12, and the oil moving along the oil outlet pipe 12 is allowed to move into the collection box 32, thereby completing the collection of the oil.

[0044] In one embodiment, as Figure 3 shown, the device 100 further includes a filtering mechanism 4 provided at the liquid inlet 11. The filtering mechanism 4 is used for preliminarily filtering the untreated fluid. In this embodiment, the filtering mechanism 4 includes a fixing member 41 extending upward along the liquid inlet 11, a liquid inlet hopper 42 provided on the fixing member 41, and at least one filtering component 43 located between the fixing member 41 and the liquid inlet 11 for filtering the fluid.

[0045] In one embodiment, as Figure 3 shown, a first groove 411 is formed by inward depression on the fixing portion 41. The filtering component 43 includes an insertion portion 431 configured to be complementary in shape to the first groove 411, and a filter net 432 provided on the insertion portion 431. In this way, the fixing portion 41 and the filtering component 43 can be detachably connected together. In this setting, the fixing portion 41 can be connected to the liquid inlet 11, and the insertion portion 431 can be inserted into the first groove 411. At the same time, the filter net 432 is provided on the insertion portion 431. Thus, the fixing portion 41 and the filtering component 43 are connected together, and the filtering component 43 can filter the fluid.

[0046] In addition, as Figure 3As shown, a second groove 433 is provided on the insertion part 431, and the second groove 433 is configured to be able to accommodate the liquid inlet hopper 42. In this way, the liquid inlet hopper 42 and the filter assembly 43 can be detachably connected together.

[0047] In this setting mode, during use, the fixing part 41, the filter assembly 43 and the liquid inlet hopper 42 are detachably connected together. Then, fluid is conveyed into the liquid inlet hopper 42. During this process, the fluid will move downward along the liquid inlet hopper 42, and the filter assembly 43 filters out impurities in the fluid. Thus, preliminary filtration of the untreated fluid can be carried out.

[0048] According to a preferred embodiment of the present invention, as Figure 3 shown, the filter assembly 43 is provided in three and overlaps in sequence. In this way, the fluid moving along the liquid inlet hopper 42 can be filtered three times, thereby further filtering out the impurities contained in the fluid.

[0049] According to a preferred embodiment of the present invention, as Figure 3 shown, the liquid inlet hopper 42 is configured such that the surface area at the liquid inlet is larger than the surface area at the liquid outlet. In this way, the liquid inlet area can be increased, facilitating the addition of fluid. In addition, a handle 421 is provided on the liquid inlet hopper 42, and the handle 421 is used to provide a fulcrum for applying force, facilitating the installation or disassembly of the liquid inlet hopper 42.

[0050] In one embodiment, as Figure 2 shown, the device 100 further includes a stirring chamber 5, and the stirring chamber 5 is located below the liquid inlet 11 and is in communication with the liquid inlet 11. In this way, the fluid flowing along the flow path of the liquid inlet 11 can enter the stirring chamber 5. In this embodiment, the stirring chamber 5 is respectively connected to the side plate 14 and the top plate 15. At the same time, a liquid flow pipe 51 communicating with the inside of the stirring chamber 5 is provided at the bottom of the stirring chamber 5, and the free end of the liquid flow pipe 51 extends to the first oil filter assembly 21. In this way, the fluid in the stirring chamber 5 can move along the liquid flow pipe 51 to the first oil filter assembly 21.

[0051] At the same time, as Figure 2As shown, the device 100 further includes a stirring mechanism 6 for stirring the fluid in the stirring chamber 5. In this embodiment, the stirring mechanism 6 includes a stirring shaft 61 penetrating the side wall 14 and disposed in the stirring chamber 5, and a driving mechanism 62 located at the free end of the stirring shaft 61 and connected to the stirring shaft 61. The driving mechanism 62 is used to drive the stirring shaft 61 to rotate, thereby stirring the fluid located in the stirring chamber 5. In this way, the layering of the fluid located in the stirring chamber 5 can be avoided. Preferably, in this embodiment, the driving mechanism 62 is configured as a motor.

[0052] According to a preferred embodiment of the present invention, as Figure 2 shown, the end of the stirring shaft 61 extends to the stirring chamber 5 and abuts against the stirring chamber 5 in a movable manner. In this way, the stirring shaft 61 can be axially supported, thereby preventing the stirring shaft 61 from shaking under continuous rotation. Thus, the stirring shaft 61 can stably stir the fluid located in the stirring chamber 5.

[0053] According to a preferred embodiment of the present invention, as Figure 2 shown, a support base 63 is provided on the box body 1 below the driving mechanism 62. The support base 63 is used to receive the driving mechanism 62, so that the driving mechanism 62 can stably drive the stirring shaft 61 to rotate. In this embodiment, the support base 63 includes a support plate 631 disposed on the side plate 14 and extending horizontally, and a reinforcing rib 632 having one end connected to the support plate 63 and the other end extending to the side plate 14. In this way, the driving mechanism 62 can be stably placed on the support base 63.

[0054] According to a preferred embodiment of the present invention, as Figure 2 shown, the device 100 further includes support legs 18 provided on the bottom plate 13. The support legs 18 are used to space the device 100 from the placement surface, thereby preventing the device 100 from coming into contact with the placement surface and causing wear. Thus, the service life of the device 100 can be extended.

[0055] The operation of the device 100 for filtering oily sewage according to the present invention is as follows.

[0056] First, a first oil filtering component 21, a second oil filtering component 22, and a third oil filtering component 23 are arranged in the box body 1, and the first oil filtering component 21, the second oil filtering component 22, and the third oil filtering component 23 are arranged in the box body 1 in sequence from top to bottom and are respectively communicated with the oil outlet pipe 12. At the same time, the fixing part 41 is connected to the liquid inlet 11, and the filtering component 43 and the liquid inlet hopper 42 are sequentially arranged on the fixing part 41. And a stirring cavity 5 is arranged below the liquid outlet 11, and the stirring mechanism 6 is located in the stirring cavity 5. In addition, the collection box 32 is arranged below the oil outlet pipe 12 so that the oil liquid moving along the oil outlet pipe 12 can move into the collection box 32. Thus, the assembly work of the device 100 is completed.

[0057] When it is necessary to filter a fluid containing oil liquid, the fluid is poured along the liquid inlet hopper 42 so that the fluid can move downward along the liquid inlet hopper 42. During this process, the fluid will pass through the filtering component 43, thereby filtering out the impurities in the fluid through the filtering component 43.

[0058] As the filtered fluid continuously moves downward, the fluid will move into the stirring cavity 5. At this time, the stirring mechanism 6 is started, and the stirring mechanism 6 will continuously stir the preliminarily filtered fluid to prevent the fluid in the stirring cavity 5 from stratifying.

[0059] During this process, the preliminarily filtered fluid passing through the stirring cavity 5 will continuously move downward, sequentially pass through the first oil filtering component 21, the second oil filtering component 22, and the third oil filtering component 23, and the oil liquid contained in the fluid filtered for the first time will be filtered out by the first oil filtering component 21, the second oil filtering component 22, and the third oil filtering component 23 and discharged into the collection box 32 along the oil outlet pipe 12. Thus, the oil filtering work of the fluid is completed.

[0060] At the same time, the fluid that has undergone the oil filtering work will be located in the chamber 16 and move to the outside along the liquid outlet pipe 17. Thus, the treatment work for the oily sewage is completed.

[0061] It can be understood that the present utility model is described through some embodiments. As is known to those skilled in the art, without departing from the spirit and scope of the present utility model, various changes or equivalent replacements can be made to these features and embodiments. In addition, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present utility model.

Claims

1. A device for filtering oily wastewater, characterized in that: It comprises a box body (1), and an oil filtering mechanism (2) arranged in the box body (1). A liquid inlet (11) is provided on the box body (1), the liquid inlet (11) passes through the wall of the box body (1) and is opposite to the oil filter mechanism (2), and is used to allow the fluid to move along the liquid inlet (11) to the oil filter mechanism (2), thereby filtering the fluid. The box body (1) is also provided with an oil outlet pipe (12) which is in communication with the interior of the box body (1), and the oil outlet pipe (12) is configured to allow oil filtered by the oil filter mechanism (2) to pass through. The oil filter mechanism (2) comprises a first oil filter assembly (21), the first oil filter assembly (21) comprising an oil filter groove (211) arranged on the inner wall of the housing (1) and extending transversely for filtering oil in the fluid, and a guide plate (212) arranged below the oil filter groove (211) and inclined along the free end of the oil filter groove (211) to the inner wall of the housing (1), and the oil outlet pipe (12) is arranged between the oil filter groove (211) and the guide plate (212).

2. The device for filtering oily wastewater according to claim 1, characterized in that: The box body (1) is also provided with a liquid outlet pipe (17) which is in communication with the interior of the box body (1), and the liquid outlet pipe (17) is configured to allow the fluid filtered by the oil filtering mechanism (2) to pass through.

3. The device for filtering oily wastewater according to claim 2, characterized in that: The oil filter mechanism (2) further comprises a second oil filter assembly (22) arranged below the first oil filter assembly (21); the second oil filter assembly (22) is constructed to have the same structure as the first oil filter assembly (21), but the lateral extension distance of the second oil filter assembly (22) is greater than that of the first oil filter assembly (21), and is used to receive the fluid that overflows along the first oil filter assembly (21) and is filtered by the first oil filter assembly (21).

4. The device for filtering oily wastewater according to claim 3, characterized in that: The oil filter mechanism (2) further comprises a third oil filter assembly (23) arranged below the second oil filter assembly (22); the third oil filter assembly (23) is constructed to have the same structure as the second oil filter assembly (22), but the lateral extension distance of the third oil filter assembly (23) is greater than that of the second oil filter assembly (22), and is used to receive the fluid that overflows along the second oil filter assembly (22) and is filtered by the second oil filter assembly (22).

5. The device for filtering oily wastewater according to claim 4, characterized in that: The oil outlet pipes (12) are provided in three numbers, and are used to discharge the oil filtered by the first oil filter assembly (21), the second oil filter assembly (22), and the third oil filter assembly (23), respectively.

6. The device for filtering oily wastewater according to any one of claims 1 to 5, characterized in that: The device further comprises a filtering mechanism (4) arranged at the liquid inlet (11) and used for preliminarily filtering impurities in the fluid.

7. The device for filtering oily wastewater according to claim 6, characterized in that: The filtering mechanism (4) comprises a liquid inlet hopper (42), at least one filtering assembly (43) and a fixing member (41) which are connected in sequence, and the fixing member (41) is used to be connected to the liquid inlet (11).

8. The device for filtering oily wastewater according to claim 7, characterized in that: The device further comprises a stirring chamber (5) located below the liquid inlet (11) and defined along the liquid inlet (11), for accommodating the fluid filtered by the filtering mechanism (4); a stirring mechanism (6) for stirring the fluid to avoid fluid stratification is arranged in the stirring chamber (5); a liquid flow tube (51) connected to the stirring chamber (5) is also arranged on the stirring chamber (5); a free end of the liquid flow tube (51) extends to the first oil filter assembly (21).

9. The device for filtering oily wastewater according to claim 8, characterized in that: The stirring mechanism (6) comprises a stirring shaft (61) arranged in the stirring chamber (5), and a driving mechanism (62) located at the free end of the stirring shaft (61) and used for driving the stirring shaft (61) to rotate in the stirring chamber (5).

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