A composite rectangular pool

Abstract

This utility model discloses a combined rectangular tank in the field of oil-water separation equipment technology, including an oil-water separator. The oil-water separator has an oil-water separation chamber inside, and a diversion baffle is fastened to the front end of the oil-water separation chamber. The diversion baffle has an acute-angle bend structure, including an upward-facing guide surface and a rearward-facing inner bend surface. An oil inlet is provided directly above the oil-water separator and directly above the diversion baffle. A slag collection box is inclinedly arranged directly behind the inner bend surface. By installing the acute-angle bend diversion baffle at the front end of the oil-water separation chamber, with its upward-facing guide surface inclined to the slag collection box, and in conjunction with the inclined design of the first inclined water flow screen plate and the first bottom guide plate inside the slag collection box, rapid separation of large pieces of residue from the wastewater is achieved. The residue enters the slag collection box by gravity and water flow inertia, and remains dry after double dehydration by the screen plate and guide plate, effectively preventing the residue from producing foul odors due to long-term moisture.

Description

Technical Field

[0001] This utility model relates to the field of oil-water separation equipment technology, and in particular to a combined rectangular pool. Background Technology

[0002] In the daily operations of industries such as catering, food processing, and auto repair, a large amount of wastewater containing oil and solid residue is generated. If this wastewater is discharged directly, it needs to undergo preliminary treatment to separate oil, water, and residue. Grease traps are commonly used equipment in this process. They separate grease, solid residue, and water from the wastewater by utilizing physical methods such as differences in material density and guiding flow structures, providing a foundation for subsequent pipeline transportation and advanced treatment.

[0003] Existing grease traps often fail to effectively separate wastewater containing large amounts of grease due to the continuous mixing and repeated scouring of the grease with the wastewater. This results in the grease remaining moist for extended periods, which can produce odors. Furthermore, the grease discharge structure is susceptible to fluctuations in water flow, leading to incomplete grease separation or overflow under strong water pressure. To address these issues, we propose a modular rectangular tank. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of the present invention, to avoid obscuring the purpose of these documents, and such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] Therefore, the purpose of this utility model is to provide a combined rectangular tank that can solve the problems of existing grease traps when treating sewage containing a large amount of large residue. These problems are that the residue and sewage are constantly mixed and repeatedly washed by water flow, making it difficult to achieve effective separation. As a result, the residue is kept in a moist state for a long time and is prone to producing odor. Its oil discharge structure is easily affected by water flow fluctuations, and under the impact of large water flow, the oil is prone to incomplete separation or overflow with the water flow.

[0006] To solve the above-mentioned technical problems, this utility model provides a combined rectangular pool with the following technical solution: it includes an oil-separating tank, an oil-separating cavity inside the oil-separating tank, and a diversion and guiding baffle plate fastened to the front end of the oil-separating cavity. The diversion and guiding baffle plate has an acute-angle bent structure, including an upward guiding surface and a rearward inner bend surface. An oil inlet is opened directly above the oil-separating tank and directly above the diversion and guiding baffle plate, and a slag collection box is inclinedly arranged directly behind the inner bend surface. Several inlet holes are opened on the guiding surface. The diversion and guiding baffle plate receives the slag-containing wastewater entering from the oil inlet through the upward guiding surface. The inclined angle of the guiding surface allows large pieces of residue to slide towards the slag collection box by gravity and water inertia. The wastewater flows through the inlet holes to the front of the diversion and guiding baffle plate for subsequent treatment.

[0007] Optionally, a diversion channel is provided at the front of the slag collection box. The diversion channel is parallel to the inner bend of the diversion and guiding baffle. A first outlet hole is provided at the bottom of the diversion channel. Wastewater entering from the oil inlet can flow along the channel wall and inner bend of the diversion channel and be discharged through the first outlet hole. A first inclined water flow screen plate is integrally formed inside the slag collection box. The first inclined water flow screen plate is provided with several drainage holes. The first inclined water flow screen plate is inclined at the front and lower at the back to receive large pieces of slag conveyed by the guiding surface of the diversion and guiding baffle. The slag can roll backward along the inclined direction of the first inclined water flow screen plate and be dewatered through the screen plate.

[0008] Optionally, a first guide plate is provided directly below the slag collection box. The first guide plate is inclined with the front lower and the back higher. The slag collection box is provided with a second outlet hole at the lowest point of the first guide plate. The water collected by the first guide plate can flow along its inclined direction and be discharged through the second outlet hole. The large slag pieces will not fall into the diversion channel due to the obstruction of the inner bend of the diversion guide plate.

[0009] Optionally, a plurality of buffer guide plates are arranged at an angle between the flow diversion baffle and the oil separation chamber of the oil separator. Water discharged from the first outlet and the second outlet flows into the buffer guide plate. An anti-settling protrusion is provided at the bottom of the oil separation chamber and directly behind the flow diversion baffle. An oil separation baffle is also provided in the oil separation chamber. A gap is left between the oil separation baffle and the anti-settling protrusion, and the gap forms a first water passage.

[0010] Optionally, a first oil accumulation chamber is formed directly below the oil separator baffle. A first baffle is provided at the bottom of the oil separation chamber, directly behind the diversion and guide baffle. The highest point of the first baffle is higher than the highest point of the oil separator baffle. A first partition is provided directly behind the oil separation chamber and inside it. The first partition and the inner wall of the oil separation chamber form a right-angle clearance groove. An oil collection tank is placed in the clearance groove, and the highest point of the first partition is higher than the highest point of the first baffle.

[0011] Optionally, the oil separating baffle is inclined with a large chamfer, and its highest surface is a small plane. An oil guide pipe is connected and securely installed directly above the highest surface of the oil separating baffle. The oil guide pipe is connected to the middle of the oil collection tank. When the water level in the oil separating chamber is above the first baffle, the water pressure can push the grease at the top of the first oil collection chamber into the oil collection tank through the oil guide pipe.

[0012] Optionally, limiting slide rails are fastened to the left and right sides inside the oil separator. The limiting slide rails are inclined and parallel to the first guide plate at the bottom of the slag collection box. Rotary hidden handles are provided on the top of both the slag collection box and the oil collection tank. A partition plate is movably installed on the top of the oil separator. A water outlet pipe is fastened to the rear of the oil separator, located behind the first baffle. A water inlet pipe is provided in front of the oil separator, and the water inlet pipe is matched with the oil inlet.

[0013] In summary, this utility model has at least one of the following beneficial effects: 1. By installing a diversion and guide baffle plate with an acute angle bend at the front end of the oil-separating chamber, the guide surface facing upward is inclined to the slag collection box. Combined with the inclined design of the first inclined water flow screen plate and the first bottom guide plate in the slag collection box, the rapid separation of large pieces of residue from the wastewater containing slag is achieved. The residue enters the slag collection box by gravity and water flow inertia. After being dehydrated by the screen plate and the guide plate, it remains dry, effectively avoiding the odor caused by long-term moisture in the residue.

[0014] 2. By setting a limiting slide rail, a rotating concealed handle, and a movable partition plate in the oil-water separation chamber, the limiting slide rail is parallel and inclined to the first guide plate at the bottom of the slag collection box, ensuring that the slag collection box is parallel to the inner curved surface after installation to ensure water discharge. The slag collection box can be lifted along the slide rail, the handle is convenient for picking up and cleaning, the partition plate is convenient for internal maintenance, and the oil separation baffle and oil guide pipe work together with water level and pressure to achieve automatic grease collection, unaffected by water flow oscillation. This not only improves the ease of operation of the equipment, but also ensures the high efficiency and stability of oil-water separation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a partial structural schematic diagram of the present invention; Figure 3 This is a partial disassembled structural diagram of the present invention; Figure 4 This is a partial side view of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Oil separator body; 12. Oil separator chamber; 13. Oil inlet; 2. Diverting and guiding baffle; 21. Guiding surface; 211. Inlet hole; 22. Inner bend surface; 3. Slag collection box; 31. Diversion channel; 311. First outlet hole; 32. First inclined water flow screen plate; 321. Drain hole; 33. First guide plate; 331. Second outlet hole; 34. Limiting slide rail; 4a. Buffer guide plate; 4b. Anti-settling protrusions; 5. Oil separator baffle; 5a. First water passage; 5b. First oil accumulation chamber; 6a. First baffle; 6b. First partition; 6c. Divider plate; 7. Oil collection tank; 71. Rotating concealed handle; 72. Oil guide pipe; 8a. Outlet pipe; 8b. Inlet pipe. Detailed Implementation

[0018] The following is in conjunction with the appendix Figure 1-4 The present invention will be described in further detail below.

[0019] Example 1, refer to Figure 1-4 In this embodiment, to address the problems of existing grease traps in treating wastewater containing large amounts of residue, where effective separation is often difficult due to continuous mixing and repeated scouring by water flow, resulting in residue remaining moist and prone to odor, and the grease discharge structure being susceptible to water flow fluctuations, leading to incomplete grease separation or overflow under strong water flow impacts, this utility model discloses a combined rectangular tank. The system includes an oil separator 1, inside which is an oil separation chamber 12. A diversion baffle 2 is fastened to the front end of the oil separation chamber 12. The diversion baffle 2 has an acute-angle bend structure, including an upward-facing guide surface 21 and a rearward-facing inner bend surface 22. An oil inlet 13 is provided directly above the oil separator 1 and directly above the diversion baffle 2. A slag collection box 3 is inclinedly arranged directly behind the inner bend surface 22. Several inlet holes 211 are provided on the guide surface 21. The diversion baffle 2 receives the slag-containing wastewater entering from the oil inlet 13 through the upward-facing guide surface 21. The inclined angle of the guide surface 21 is used to allow large pieces of residue to pass through. Gravity and water inertia cause the wastewater to slide towards the slag collection box 3, while the wastewater flows through the inlet hole 211 to the front of the diversion guide baffle 2 for further treatment. This device achieves the initial separation of slag-containing wastewater through the diversion guide baffle 2. In the acute-angle bending structure of the diversion guide baffle 2, the upward-facing guide surface 21 receives the slag-containing wastewater flowing in from the oil inlet 13 directly above. Its design of tilting towards the slag collection box 3 utilizes the dual effects of gravity and water inertia to guide large pieces of residue to slide along the guide surface 21 to the slag collection box 3. The wastewater flows through the inlet hole 211 on the guide surface 21 to the front of the diversion guide baffle 2, achieving the initial separation of residue and wastewater.

[0020] A diversion channel 31 is provided at the front of the slag collection box 3. The diversion channel 31 is parallel to the inner bend surface 22 of the diversion and flow guiding baffle 2. A first outlet hole 311 is provided at the bottom of the diversion channel 31. Wastewater entering from the oil inlet 13 can flow along the channel wall and inner bend surface 22 of the diversion channel 31 and be discharged through the first outlet hole 311. A first inclined water flow screen plate 32 is integrally formed inside the slag collection box 3. Several drainage holes 321 are provided on the first inclined water flow screen plate 32. The first inclined water flow screen plate 32 is inclined at the front and lower at the back to receive large pieces of slag conveyed by the guide surface 21 of the diversion and flow guiding baffle 2. The slag can roll backward along the inclined direction of the first inclined water flow screen plate 32 and be dewatered through the screen plate. The diversion channel 31 of the slag collection box 3 is set parallel to the inner bend surface 22 of the diversion guide baffle 2, which can guide the sewage to flow along the channel wall and the inner bend surface 22 and be discharged through the first outlet hole 311 at the bottom, so as to avoid the sewage from accumulating in the slag collection area. The first inclined water flow screen plate 32, which is integrally formed inside, is inclined in the front and low in the back. It not only receives the large pieces of slag conveyed from the guide surface 21, but also makes the slag roll backward through its own inclination angle. At the same time, the water carried by the slag is discharged through the outlet hole 321 on the screen plate, so as to achieve the dewatering of the slag.

[0021] A first guide plate 33 is installed directly below the slag collection box 3. The first guide plate 33 is inclined with a lower front and a higher rear. The slag collection box 3 has a second outlet hole 331 at the lowest point of the first guide plate 33. The water collected by the first guide plate 33 can flow along its inclined direction and be discharged through the second outlet hole 331. Large pieces of slag will not fall into the diversion channel 31 due to the obstruction of the inner bend surface 22 of the diversion guide baffle 2. The first guide plate 33 directly below the slag collection box 3 adopts an inclined design with a lower front and a higher rear, which can efficiently collect the water leaking through the first inclined water flow screen plate 32 and guide the water flow to the lowest point through the inclined angle, and finally discharge it through the second outlet hole 331, further enhancing the slag dewatering effect. The inner bend surface 22 of the diversion guide baffle 2 forms a physical obstruction, which can effectively prevent large pieces of slag from falling into the diversion channel 31, ensuring that all slag enters the slag collection box 3 for dewatering treatment.

[0022] Several back-and-forth inclined buffer guide plates 4a are arranged inside the oil-separating chamber 12 between the diversion baffle 2 and the oil-separating tank 1. Water discharged from the first outlet 311 and the second outlet 331 flows into the buffer guide plate 4a. At the bottom of the oil-separating chamber 12 and directly behind the diversion baffle 2, an anti-settling protrusion 4b is provided. An oil-separating baffle 5 is also provided inside the oil-separating chamber 12. A gap is left between the oil-separating baffle 5 and the anti-settling protrusion 4b, which forms the first water passage. The buffer guide plate 4a between the diversion guide baffle 2 and the oil-separating chamber 12 is arranged at an angle to the flow. It plays a buffering and deceleration role for the sewage flowing in through the inlet hole 211, the first outlet hole 311 and the second outlet hole 331, so as to avoid the impact of water flow on subsequent oil-water separation. The gap between the anti-sedimentation protrusion 4b at the bottom of the oil-separating chamber 12 and the oil-separating baffle 5 forms the first water passage 5a, which reduces the deposition of particulate matter in the sewage at the bottom and provides a channel for sewage flow.

[0023] A first oil accumulation chamber 5b is formed directly below the oil separator 5. A first baffle 6a is provided at the bottom of the oil separator 12, directly behind the diversion and guiding baffle 2. The highest point of the first baffle 6a is higher than the highest point of the oil separator 5. A first partition 6b is provided directly behind and inside the oil separator 12. The first partition 6b and the inner wall of the oil separator 12 form a right-angle clearance groove. An oil collection tank 7 is placed in the clearance groove. The highest point of the first partition 6b is higher than the highest point of the first baffle 6a. The first oil accumulation chamber 5b formed directly below the oil separator 5 can collect grease from the sewage. The height of the first baffle 6a at the bottom of the oil separator 12 is higher than that of the oil separator 5, which can control the residence time of sewage in the oil separator 12 and ensure that the grease floats to the oil accumulation chamber. The first partition 6b behind the oil separator 12 forms a right-angle clearance groove with the inner wall, providing a stable placement space for the oil collection tank 7.

[0024] The oil separator baffle 5 is inclined with a large chamfer, and its highest surface is a small flat surface. An oil guide pipe 72 is connected and securely installed directly above the highest surface of the oil separator baffle 5. The oil guide pipe 72 is connected to the middle of the oil collection tank 7. When the water level in the oil separation chamber 12 exceeds the first baffle 6a, the water pressure can push the grease at the top of the first oil accumulation chamber 5b into the oil collection tank 7 through the oil guide pipe 72. The large chamfered inclined design of the oil separator baffle 5 makes it easier for grease to accumulate on the small flat surface at the highest point. The oil guide pipe 72 directly above it is connected to the middle of the oil collection tank 7. When the water level in the oil separation chamber 12 exceeds the first baffle 6a, the water pressure will push the grease at the top of the first oil accumulation chamber 5b into the oil collection tank 7 through the oil guide pipe 72, realizing automatic collection of grease. Moreover, this structure is not affected by water flow vibration.

[0025] Limiting slide rails 34 are fastened to the left and right sides inside the oil separator 12. The limiting slide rails 34 are inclined and parallel to the first guide plate 33 at the bottom of the slag collection box 3. Rotary hidden handles 71 are provided directly above the slag collection box 3 and the oil collection tank 7. A partition plate 6c is movably installed directly above the oil separator 12. A water outlet pipe 8a is fastened to the rear of the oil separator 12, directly behind the first baffle 6a. A water inlet pipe 8b is provided to the front of the oil separator 12, and the water inlet pipe 8b matches the oil inlet 13. The limiting slide rails 34 on both sides of the oil separator 12 are fastened to the bottom of the slag collection box 3. The first guide plate 33 remains parallel and inclined, providing installation positioning guidance for the slag collection box 3, facilitating its installation along the slide rail, and ensuring that the slag collection box 3 is parallel to the inner bend surface 22 of the diversion guide baffle 2, thereby ensuring smooth water discharge. The slag collection box 3 can be lifted by sliding backward along the limiting slide rail 34, or it can be placed along the inclined limiting slide rail 34. The inclination angle of the slide rail makes the slag collection box 3 contact and parallel with the inner bend surface 22 of the diversion guide baffle 2, thereby ensuring that the water from the first outlet hole 311 and the second outlet hole 331 on the slag collection box 3 can be discharged smoothly.

[0026] In one specific embodiment, the oil separator 1 is made of reinforced concrete, which has the following advantages: First, reinforced concrete can withstand external loads such as soil pressure and groundwater buoyancy, and can effectively resist the infiltration of internal sewage, reducing the risk of leakage and avoiding pollution of groundwater and surrounding soil. In addition, the concrete material itself is corrosion-resistant and anti-aging, and with the reinforcement of steel bars, the service life of the oil separator can reach more than 70 years, which is much longer than that of materials such as plastic and glass, reducing the cost of replacement later. Second, whether it is a soft soil foundation, a high water level area or a cold region, the reinforced concrete oil separator can adapt to the environment through reasonable design and is not easy to crack due to foundation settlement or temperature changes. It can be directly buried in areas with heavy vehicle traffic such as roads and parking lots without additional reinforcement, while materials such as plastic need to be avoided due to environmental factors. Third, the hard surface of reinforced concrete can withstand the pressure of biogas and the impact of debris inside the grease trap, reducing maintenance needs. The inner wall can also be smoothed to reduce dirt adhesion, making it easy to clean regularly without structural damage caused by mechanical operations during cleaning. Fourth, the density of concrete itself, combined with waterproofing during construction, can effectively prevent sewage leakage, protecting groundwater resources and soil ecology. Reinforced concrete is mainly composed of natural or industrial materials such as cement, sand, and steel bars, without releasing harmful chemicals, and can be recycled after disposal, minimizing environmental impact. Fifth, large or irregularly shaped grease traps can be cast on-site to adapt to different site dimensions. Small grease traps can be prefabricated and hoisted, shortening the construction cycle. The volume and structure can be flexibly designed according to the number of users and usage scenarios to meet different sewage discharge requirements.

[0027] In one specific embodiment, the rectangular oil separator 1 can solve the problem of water leakage at the joints caused by the non-integral molding of the existing circular oil separator 1 on the market, and effectively improve the compressive strength and impermeability of the oil separator 1, avoiding the problem of the circular oil separator easily collapsing when it is topped by heavy vehicles. At the same time, the protective layer thickness of the rectangular oil separator 1 is greater than that of the circular one, which not only improves its corrosion resistance, but also greatly reduces the carbonation process of concrete and extends the service life of the entire oil separator 1.

[0028] In one specific embodiment, the oil separator 1 of this utility model is 13 meters long, 2.8 meters wide, and 0.3 meters thick. These dimensions, after structural calculations, offer advantages such as low total cost and fast construction speed while meeting quality, usage requirements, and structural safety. The construction period is generally half that of a conventional cast-in-place oil separator, and it significantly reduces the risk of safety accidents in deep foundation pit projects, making it suitable for widespread application. The specific working principle is as follows: Wastewater containing slag flows into the oil inlet 13 directly above the oil separator 1 through the inlet pipe 8b, and is received by the inclined guide surface 21 facing upwards on the diversion guide baffle 2. Large pieces of slag slide backward along the guide surface 21 to the slag collection box 3 under the action of gravity and water inertia. Wastewater enters the front area through the inlet hole 211 on the guide surface 21. Inside the slag collection box 3, the first inclined water flow screen plate 32 receives the slag and guides it to roll and dewater. The leaked water is collected by the first guide plate 33 at the bottom and discharged from the second outlet hole 331. At the same time, the diversion channel 31 guides some wastewater to be discharged from the first outlet hole 311 along the inner bend surface 22. The inner bend surface 22 prevents the slag from falling into the diversion channel 31 to ensure dewatering. The water flow enters the buffer guide cavity together. After being slowed down by the back-and-forth inclined buffer guide plate 4a, it flows through the first water passage 5a formed by the oil separator baffle 5 and the anti-sedimentation protrusion 4b in the oil separator cavity 12. The grease floats upward and reaches the top layer of the first oil accumulation cavity 5b below the oil separator baffle 5. When the water level exceeds the first baffle 6a, the water pressure forces the grease in the oil accumulation cavity through the oil guide pipe 72 into the oil collection tank 7 in the avoidance groove to complete the oil collection. After treatment, the sewage is discharged from the outlet pipe 8a behind the first baffle 6a. The slag collection box 3 is positioned by the limiting slide rail 34 and is conveniently maintained with the rotating hidden handle 71 and the movable partition plate 6c. The overall structure design achieves the separation of oil, water and slag.

[0029] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A modular rectangular pool, comprising an oil-separating tank (1), wherein the oil-separating tank (1) has an oil-separating cavity (12) inside, characterized in that: A diversion baffle (2) is fastened to the front end of the oil separator (12). The diversion baffle (2) has an acute-angle bent structure, including an upward-facing guide surface (21) and a rearward-facing inner bend surface (22). An oil inlet (13) is provided directly above the oil separator (1) and directly above the diversion baffle (2). A slag collection box (3) is inclinedly arranged directly behind the inner bend surface (22). Several inlet holes (211) are provided on the guide surface (21). The diversion baffle (2) receives the slag-containing sewage entering from the oil inlet (13) through the upward-facing guide surface (21). The inclined angle of the guide surface (21) allows large pieces of residue to slide towards the slag collection box (3) by gravity and water flow inertia. The sewage flows to the front of the diversion baffle (2) through the inlet holes (211) for subsequent treatment.

2. The combined rectangular pool according to claim 1, characterized in that: A diversion channel (31) is provided in front of the slag collection box (3). The diversion channel (31) is parallel to the inner bend surface (22) of the diversion guide plate (2). A first outlet hole (311) is provided at the bottom of the diversion channel (31). Wastewater entering from the oil inlet (13) can flow along the channel wall and inner bend surface (22) of the diversion channel (31) and be discharged through the first outlet hole (311). A first inclined water flow screen plate (32) is integrally formed inside the slag collection box (3). Several drainage holes (321) are provided on the first inclined water flow screen plate (32). The first inclined water flow screen plate (32) is inclined in front and low in back, and is used to receive large pieces of slag conveyed by the guide surface (21) of the diversion guide plate (2). The slag can roll backward along the inclined direction of the first inclined water flow screen plate (32) and be dewatered through the screen plate.

3. A combined rectangular pool according to claim 2, characterized in that: A first guide plate (33) is provided directly below the slag collection box (3). The first guide plate (33) is inclined with the front lower and the back higher. The slag collection box (3) is provided with a second outlet hole (331) at the lowest point of the first guide plate (33). The water collected by the first guide plate (33) can flow along its inclined direction and be discharged through the second outlet hole (331). The large slag pieces will not fall into the diversion channel (31) due to the obstruction of the inner bend surface (22) of the diversion guide baffle (2).

4. A combined rectangular pool according to claim 2, characterized in that: Several back-and-forth inclined buffer guide plates (4a) are provided inside the oil-separating chamber (12) of the oil-separating tank (1). The water discharged from the first outlet hole (311) and the second outlet hole (331) flows into the buffer guide plate (4a). At the bottom of the oil-separating chamber (12) and directly behind the flow-separating baffle plate (2), there is an anti-settling protrusion (4b). The oil-separating chamber (12) is also provided with an oil-separating baffle (5). There is a gap between the oil-separating baffle (5) and the anti-settling protrusion (4b). This gap forms the first water passage (5a).

5. A combined rectangular pool according to claim 4, characterized in that: A first oil accumulation chamber (5b) is formed directly below the oil separator (5). A first baffle (6a) is provided at the bottom of the oil separator (12) and directly behind the diversion guide baffle (2). The highest point of the first baffle (6a) is higher than the highest point of the oil separator (5). A first partition (6b) is provided directly behind the oil separator (12) and inside it. The first partition (6b) and the inner wall of the oil separator (12) form a right-angle clearance groove. An oil collection tank (7) is placed in the clearance groove. The highest point of the first partition (6b) is higher than the highest point of the first baffle (6a).

6. A combined rectangular pool according to claim 5, characterized in that: The oil separator (5) is inclined with a large chamfer, and its highest surface is a small plane. An oil guide pipe (72) is connected and securely installed directly above the highest surface of the oil separator (5). The oil guide pipe (72) is connected to the middle of the oil collection tank (7). When the water level in the oil separation chamber (12) exceeds the first baffle (6a), the water pressure can push the grease at the top of the first oil accumulation chamber (5b) into the oil collection tank (7) through the oil guide pipe (72).

7. A combined rectangular pool according to claim 1, characterized in that: The oil separator (12) is fitted with limiting slide rails (34) on both the left and right sides. The limiting slide rails (34) are inclined and parallel to the first guide plate (33) at the bottom of the slag collection box (3). Rotating hidden handles (71) are provided directly above the slag collection box (3) and the oil collection tank (7). A partition plate (6c) is movably installed directly above the oil separator (12). A water outlet pipe (8a) is fitted directly behind the oil separator (12) and directly behind the first baffle (6a). A water inlet pipe (8b) is provided directly in front of the oil separator (12). The water inlet pipe (8b) is matched with the oil inlet (13).

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