Circulating oil pump structure and oil tank with same

Abstract

The utility model provides a circulating oil pump structure and the oil tank with it, including motor, limiting component, circulating component, limiting component includes the round pipe, sets up the first flange of round pipe one end and sets up the second flane of round pipe other end, the first flange is arranged in parallel with the second flange, and all with round pipe coaxial arrangement, the first flange is connected with motor, the second flange is connected with circulating component, motor shaft of motor is arranged coaxially with round pipe, and passes first flange, round pipe and second flane in proper order and is connected with circulating component, is provided with exhaust port on circulating component. Through the welding flange of round pipe both ends as the limiting structure, can reduce welding through the flange connection, avoid welding deformation, reduce the number of parts simultaneously, guarantee concentricity, reduce noise, prolong the life, guarantee the parallelism of two flanges, avoid the scratch of circulating component when running.

Description

Technical Field

[0001] This utility model relates to the field of oil pump technology, and is particularly applicable to a circulating oil pump structure and an oil tank having the same. Background Technology

[0002] In existing technologies, circulating oil pumps generally use long-shaft motors. The structure of long-shaft motors causes the rotor to generate a large centrifugal force when rotating at high speed. Although the impeller in the oil suction pipe and the long-shaft motor are dynamically balanced, radial vibration can still occur in actual operation due to uneven liquid flow and mechanical vibration. This causes friction between the motor and the pump body, which not only generates a lot of noise but also affects the service life. Therefore, it is necessary to perform auxiliary positioning on the end of the long-shaft motor's power shaft to limit its radial movement range.

[0003] However, existing circulating oil pump structures typically use a four-column welded structure for the suction pump and suction pipe. The advantage of this structure is that the long shaft of the suction pump can be exposed on the outside, making it easy to check its seal. The disadvantage is that this structure is extremely difficult to guarantee coaxiality. Due to welding deformation or insufficient mechanical strength, the coaxiality of the suction pump and suction pipe may be insufficient, which in turn causes the long shaft of the suction pump to generate greater axial vibration, increases the friction between the long shaft and the suction pump, and results in greater noise and a sharp reduction in service life. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned problems by providing a circulating oil pump structure and an oil tank having the same.

[0005] To achieve the above-mentioned utility model objectives, this utility model provides a circulating oil pump structure, including a motor, a limiting component connected to the motor, and a circulating component connected to the limiting component; The limiting component includes a circular tube, a first flange disposed at one end of the circular tube, and a second flange disposed at the other end of the circular tube. The first flange and the second flange are arranged parallel to each other and are both coaxial with the circular tube. The first flange is connected to the motor, and the second flange is connected to the circulation component. The motor shaft of the motor is coaxially arranged with the circular tube, and passes through the first flange, the circular tube and the second flange in sequence and is connected to the circulation assembly. An exhaust port is provided on the circulation component.

[0006] More specifically, the circulation assembly includes a turbine box, an impeller disposed within the turbine box, an oil suction pipe communicating with the middle of the turbine box, and an oil return pipe communicating with the side of the turbine box. The impeller is connected to the motor shaft, the turbine box is connected to the second flange, and the exhaust port is disposed on the turbine box.

[0007] More specifically, an exhaust groove is provided on the side of the second flange near the turbine box, and the exhaust port is located in the exhaust groove; The second flange forms a horizontal projection surface on the turbine box, and the exhaust port is located within the horizontal projection surface.

[0008] More specifically, a sealing groove is provided on the second flange, the sealing groove is coaxially arranged with the round pipe, and a skeleton oil seal is provided in the sealing groove, the skeleton oil seal is located between the second flange and the turbine box.

[0009] More specifically, an oil drain port is provided at the end of the circular pipe near the second flange, and at least one oil drain port is provided.

[0010] More specifically, a cleaning port is provided at the end of the circular tube near the first flange.

[0011] An oil tank includes an oil tank body, a circulating oil pump structure disposed on the oil tank body, an oil trough disposed on the oil tank body, and an oil outlet disposed at the bottom of the oil tank body. The return oil pipe of the circulation component is connected to the oil outlet, and the suction oil pipe of the circulation component is connected to the oil tank body.

[0012] More specifically, the circulating oil pump structure is provided with an upper cover, which is rotatably mounted on the oil tank body.

[0013] More specifically, a circulating oil inlet pipe is provided on the oil outlet, and a ball valve assembly is provided between the oil outlet and the circulating oil inlet pipe.

[0014] More specifically, the ball valve assembly includes a ball valve, a high-pressure clamp, and a PTFE gasket. The two ends of the ball valve are respectively connected to the oil outlet and the circulating oil inlet pipeline. The PTFE gasket is sleeved on both ends of the ball valve, and the high-pressure clamp is set on the PTFE gasket.

[0015] This utility model mainly designs a circulating oil pump structure and an oil tank with it. The flanges welded to both ends of the round pipe serve as limiting structures. The flange connection can reduce welding, avoid welding deformation, reduce the number of parts, ensure concentricity, reduce noise, extend service life, ensure the parallelism of the two flanges, and prevent the circulating components from rubbing against each other during operation. Attached Figure Description

[0016] Exemplary embodiments of this application will now be described in detail with reference to the accompanying drawings. It should be understood that the embodiments described below are for illustrative purposes only and do not limit the scope of this application. In the accompanying drawings: Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is the utility model Figure 1 Enlarged view of point A in the middle; Figure 3 This is a three-dimensional structural diagram of the limiting component of this utility model; Figure 4 This is a cross-sectional view of the limiting component of this utility model; Figure 5 This is the utility model Figure 4 Enlarged view at point C; Figure 6 This is a three-dimensional structural diagram of the present invention in conjunction with the top cover; Figure 7 This is the utility model Figure 6 Enlarged view at point B in the middle; Figure 8 This is a front view schematic diagram of the structure of this utility model in conjunction with the fuel tank; Figure 9 This is a schematic diagram of the main structure of the ball valve assembly of this utility model; In the diagram: 1. Motor; 11. Motor shaft; 2. Limiting assembly; 21. Round tube; 211. Oil drain port; 212. Cleaning port; 22. First flange; 23. Second flange; 24. Sealing groove; 25. Skeleton oil seal; 31. Turbine box; 311. Exhaust port; 312. Exhaust groove; 32. Oil suction pipe; 41. Impeller; 42. Oil return pipe; 51. Oil tank body; 52. Oil trough opening; 53. Oil outlet; 54. Top cover; 61. Ball valve; 62. High-pressure clamp; 63. PTFE gasket. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this utility model. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0018] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model. The embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0019] It should be understood that the accompanying drawings are for illustrative purposes only.

[0020] An easy-to-install circulating oil pump structure, such as Figures 1-9 As shown, it includes a motor 1, a limiting component 2 connected to the motor 1, and a circulation component connected to the limiting component 2.

[0021] The limiting component 2 includes a circular tube 21, a first flange 22 disposed at one end of the circular tube 21, and a second flange 23 disposed at the other end of the circular tube 21. The first flange 22 and the second flange 23 are arranged parallel to each other and are both coaxial with the circular tube 21. The circular tube 21, the first flange 22, and the second flange 23 are welded together as a single unit to ensure reliable connection and effectively avoid the problem of concentricity being affected by external factors such as the strength of the component itself, the reserved positioning gap in welding, and deformation due to welding heat, which can affect the limiting component 2 composed of multiple parts. Furthermore, the limiting component 2 is disposed between the circulation component and the motor 1. The first flange 22 is bolted to the motor 1, and the second flange 23 is bolted to the circulation component.

[0022] The circular tube 21 is a hollow tube. After the first flange 22 and the second flange 23 are welded to the circular tube 21 to form an integral part, the internal cavity of the circular tube 21 and the openings in the middle of the first flange 22 and the second flange 23 together form a through connection channel. When the motor 1 is connected to the first flange 22, the motor shaft 11 of the motor 1 is coaxially arranged with the circular tube 21. The motor shaft 11 is inserted into the connection channel and passes through the opening of the first flange 22, the internal cavity of the circular tube 21 and the opening of the second flange 23 in sequence, and finally connects to the circulation component.

[0023] To ensure a sealed connection between the limiting component 2 and the circulation component, an annular sealing groove 24 is provided on the side of the second flange 23 near the circulation component. The sealing groove 24 is coaxially arranged with the circular tube 21 of the limiting component 2. At the same time, a skeleton oil seal 25 is installed inside the sealing groove 24. The skeleton oil seal 25 is located between the second flange 23 and the circulation component. Through the sealing effect of the skeleton oil seal 25, oil leakage is prevented from the connection gap between the second flange 23 and the circulation component, ensuring the sealing performance of the circulating oil pump structure during operation. It also has a supporting and shock-absorbing function, ensuring the operation of the shaft and avoiding vibration.

[0024] During the processing and assembly of the limiting component 2, the circular tube 21 is used as the positioning structure. After the circular tube 21, the first flange 22 and the second flange 23 are connected into an integral part by welding, the sealing groove 24 on the second flange 23 needs to be processed for coaxiality in a second time to accurately ensure the coaxiality of the sealing groove 24 and the circular tube 21. This avoids the coaxiality deviation caused by factors such as multi-part assembly, welding deformation and positioning gap from a structural perspective, thereby reducing the axial vibration of the motor shaft 11 during operation, reducing the frictional loss between the motor shaft 11 and related components, extending the service life of the equipment and reducing operating noise.

[0025] The maintenance and replacement of the skeleton oil seal 25 is convenient. When the skeleton oil seal 25 needs to be replaced, there is no need to disassemble the complex overall structure. Only the bolts connecting the circulation component to the second flange 23 need to be removed to disassemble and replace the skeleton oil seal 25 located in the sealing groove 24 of the second flange 23. This simplifies the maintenance operation process and reduces the time and cost of equipment downtime maintenance.

[0026] The circulation assembly includes a turbine housing 31, an impeller 41 disposed within the turbine housing 31, an oil suction pipe 32, and an oil return pipe 42. The oil suction pipe 32 is connected to the middle of the turbine housing 31 to ensure that oil can smoothly enter the turbine housing 31 from the oil suction pipe 32, guaranteeing subsequent oil circulation. The oil return pipe 42 is connected to the side of the turbine housing 31, ensuring the return flow of oil during the circulation process and guaranteeing that oil can be effectively transported from the turbine housing 31 through the oil return pipe 42.

[0027] The turbine box 31 is connected to the second flange 23 of the limiting assembly 2. Furthermore, the turbine box 31 and the second flange 23 are bolted together and sealed. The connection stability between the turbine box 31 and the second flange 23 is ensured by the tightening of the bolts. At the same time, the skeleton oil seal 25 is provided to better ensure the sealing of the oil during the oil circulation process, and to avoid oil leakage due to seal failure, which may affect the operation of the equipment or cause safety hazards.

[0028] The oil suction pipe 32 is located at the bottom of the turbine box 31 and is connected by bolts. The bolt connection can ensure the reliable connection between the oil suction pipe 32 and the turbine box 31, and prevent the oil suction pipe 32 from loosening or falling off due to vibration or other factors during equipment operation. It can also easily separate the oil suction pipe 32 from the turbine box 31 by removing the bolts during subsequent equipment maintenance, cleaning or component replacement, reducing the difficulty of maintenance operations and improving maintenance efficiency.

[0029] The impeller 41 is connected to the motor shaft 11. Furthermore, an external thread is machined at the end of the motor shaft 11 near the impeller 41, and correspondingly, an internal thread is machined in the middle of the impeller 41. The impeller 41 and the motor shaft 11 are connected by the meshing of the internal and external threads, enabling power transmission between them. When the motor 1 starts, the motor shaft 11 drives the impeller 41 to rotate synchronously. The centrifugal force generated during the rotation of the impeller 41 pushes the oil in the turbine box 31 towards the return oil pipe 42, thus completing the oil return flow.

[0030] Considering that the impeller 41 may loosen its connection with the motor shaft 11 due to vibration, load changes, or other factors during long-term high-speed rotation, a connector is provided to prevent such loosening from affecting the normal operation of the circulation component. This connector stably connects the impeller 41 to the motor shaft 11, ensuring a reliable connection during equipment operation and preventing power transmission failure or additional malfunctions caused by impeller 41 loosening. Of course, any structure with a connecting function can be selected for the connector; in this design, the connector is specifically a bolt and a lock nut. The cooperation of the bolt and lock nut further strengthens the connection between the impeller 41 and the motor shaft 11, improving the stability of the connection and ensuring that the impeller 41 will not loosen during high-speed rotation, thereby guaranteeing the stable operation of the circulation component and the entire circulating oil pump structure.

[0031] Since the first flange 22 connects to the motor 1 and the second flange 23 connects to the turbine box 31 in the circulation assembly, and the motor shaft 11 of the motor 1 needs to pass through the first flange 22, the round pipe 21, and the second flange 23 before connecting to the impeller 41 inside the turbine box 31, when the motor 1 starts, the motor shaft 11 drives the impeller 41 to rotate at high speed inside the turbine box 31 to achieve oil delivery, if the parallelism of the first flange 22 and the second flange 23 is not up to standard during welding, it will cause the relative positions of the motor 1 and the turbine box 31 connected to them to shift, thereby affecting the motor's operation. During the rotation of the impeller 41 driven by the shaft 11, a positional deviation occurs between the impeller 41 and the inner wall of the turbine box 31, causing scuffing. Ensuring the parallelism of the first flange 22 and the second flange 23 ensures that the relative positions of the motor shaft 11, impeller 41 and turbine box 31 are precisely matched, so that the impeller 41 is always within the preset reasonable operating space when rotating inside the turbine box 31. This avoids scuffing between the impeller 41 and the turbine box 31, ensures the stable operation of the circulating oil pump structure, reduces component wear, and extends the service life of the equipment.

[0032] The circular tube 21 is an integral structure with no gaps. The first flange 22 is sealed to the motor 1, and the second flange 23 is also sealed to the circulation assembly. These two sealed connections, combined with the gapless structure of the circular tube 21, create a relatively enclosed space for the entire limiting assembly 2. However, during initial startup, residual air remains inside the circulation assembly. This residual air creates pressure within the circulation assembly, hindering the normal entry of oil into the assembly and preventing the oil from completing the subsequent circulation process. This, in turn, affects the normal startup and operation of the circulating oil pump. Therefore, a vent 311 is specifically provided on the circulation assembly. Before or at the initial startup stage, the residual air inside the circulation assembly is promptly discharged through the vent 311. After the residual air is discharged, the pressure difference between the inside and outside of the circulation assembly is reduced, eliminating the air's obstruction to the oil's entry and ensuring that the oil can be smoothly drawn into the circulation assembly, guaranteeing the normal startup of the circulating oil pump and the realization of the oil circulation function.

[0033] Furthermore, the exhaust port 311 is disposed on the turbine housing 31, and the second flange 23 forms a horizontal projection surface on the turbine housing 31. The exhaust port 311 is disposed within the horizontal projection surface to facilitate blocking and prevent oil from spraying out of the exhaust port 311 and splashing to the outside. To prevent the exhaust port 311 from being blocked after the second flange 23 is connected to the turbine housing 31, thus preventing exhaust, an exhaust groove 312 is provided on the side of the second flange 23 near the turbine housing 31. The exhaust groove 312 is provided so that there is a gap between the second flange 23 and the turbine housing 31, while ensuring a tight connection between the second flange 23 and the turbine housing 31. The exhaust port 311 is disposed at the exhaust groove 312 to facilitate exhaust while preventing oil spray.

[0034] The skeleton oil seal 25 seals the second flange 23 to the circulation assembly. During repeated operation, it wears down due to long-term contact and friction with components such as the motor shaft 11 and the sealing groove 24. When the skeleton oil seal 25 wears down, its sealing performance decreases and it cannot achieve a complete seal. This causes the oil in the circulation process to break through the sealing gap and flow into the circular tube 21 of the limiting assembly 2. If the oil that seeps into the circular tube 21 cannot be discharged in time, it may not only affect the normal operation of the internal structure of the circular tube 21, but also leak to the outside of the equipment when the oil pump assembly is opened later, causing oil waste and safety hazards. Therefore, an oil drain port 211 is provided at the end of the circular tube 21 near the second flange 23. At least one oil drain port 211 is provided, and the oil drain port 211 is set along the opening in the middle of the second flange 23, so that the oil drain port 211 is closer to the area where the oil seeps into the circular tube 21, thereby improving the efficiency of oil collection and discharge. When two or more oil drain ports 211 are provided, the oil drain ports 211 are evenly distributed along the opening in the middle of the second flange 23. The even distribution ensures that the oil in different positions inside the circular pipe 21 can be fully collected and discharged, minimizing the oil residue in the circular pipe 21 and avoiding subsequent problems caused by oil accumulation.

[0035] A cleaning port 212 is provided at the end of the circular pipe 21 near the first flange 22. The cleaning port 212 cooperates with the oil drain port 211. When it is necessary to clean the inside of the circular pipe 21, the cleaning medium can be introduced into the circular pipe 21 through the cleaning port 212. During the flow of the cleaning medium in the circular pipe 21, it can flush away the residual oil and impurities inside. The flushed dirt and the waste liquid after cleaning can be smoothly discharged from the circular pipe 21 through the oil drain port 211. There is no need for manual entry into the circular pipe 21 for cleaning operations, which avoids the safety risks such as scratching of equipment parts and oil contact that may be faced during manual cleaning. At the same time, it also ensures the cleaning effect and safety of the cleaning operation inside the circular pipe 21.

[0036] An oil tank includes an oil tank body 51, a circulating oil pump structure disposed on the oil tank body, an oil trough 52 disposed on the oil tank body, and an oil outlet 53 disposed at the bottom of the oil tank body. The oil tank body 51 is filled with oil, and an external oil inlet pipe is connected to the oil trough 52. The oil enters the oil tank body 51 through the oil trough 52 for storage and flows out of the oil tank body 51 through the oil outlet 53. The return oil pipe is connected to the oil outlet, and the suction oil pipe is connected to the oil tank body. Furthermore, the suction oil pipe 42 is inserted into the oil tank body 51, and the return oil pipe 42 is inserted into the oil outlet 53.

[0037] To facilitate the mounting of the circulating oil pump structure on the oil tank, a top cover 54 is provided on the motor base of the motor 1. A handle is provided on the top cover 54, which is bolted to the motor base. A rotating component is also provided on the top cover 54, rotatably connected to the oil tank. When operation is required, rotating the handle connects the top cover 54 to the oil tank body 51, allowing the oil suction pipe 32 to be inserted into the oil tank body 51, and the oil return pipe 42 to the oil outlet 53. For maintenance, disconnecting the oil return pipe 42 from the oil outlet 53 and rotating the handle disconnects the top cover 54 from the oil tank body 51, allowing the oil suction pipe 32 to detach from the oil tank body 51.

[0038] A circulating oil inlet pipeline is provided on the oil outlet 53, and a ball valve assembly is provided between the oil outlet and the circulating oil inlet pipeline. The oil output can be adjusted by comparing the oil inlet and outlet, which also facilitates maintenance.

[0039] The ball valve assembly includes a ball valve 61, a high-pressure clamp 62, and a PTFE gasket 63. The two ends of the ball valve 61 are respectively connected to the oil outlet 53 and the internal circulating oil inlet pipeline. By adjusting the ball valve, the flow rate of the oil is controlled. A PTFE gasket 63 is provided at the connection, and a high-pressure clamp 62 is provided on the PTFE gasket 63, so that the ball valve 61 is tightly connected to the oil outlet 53, and also tightly connected to the internal circulating oil inlet pipeline.

[0040] Oil enters the oil tank body 51 through the external oil inlet pipe. After the oil enters the oil tank body 51, the motor 1 starts to run. After the motor 1 starts, the motor shaft 11 also rotates. Since the motor shaft 11 is connected to the impeller 41 in the turbine box 31, the rotation of the motor shaft 11 will synchronously drive the impeller 41 to rotate together. The oil will flow into the turbine box 31 through the oil suction pipe 32 and finally enter the interior of the turbine box 31 to complete the transportation before the oil circulation. Since the oil return pipe is located on the side of the turbine box, the impeller 41 generates centrifugal force due to high-speed rotation during the rotation inside the turbine box 31. The centrifugal force throws the oil stored in the turbine box 31 to the side and into the oil return pipe 42. The oil in the oil return pipe 42 will flow along the oil return pipe 42 and pass through the oil outlet 53, and finally enter the internal circulating oil inlet pipe.

[0041] This utility model mainly designs a circulating oil pump structure and an oil tank containing it. Flanges welded to both ends of the circular tube 21 serve as limiting structures, reducing welding and preventing welding deformation. It also reduces the number of parts, ensures concentricity, reduces noise, extends service life, and guarantees the parallelism of the two flanges, preventing friction between the circulating components during operation. An exhaust port 311 prevents oil from being blocked from entering the turbine box 31, and an oil drain port 211 allows oil entering the circular tube 21 to flow out after the skeleton oil seal 25 wears. A cleaning port 212, in conjunction with the oil drain port 211, cleans the inside of the circular tube 21. A rotatable top cover 54 facilitates maintenance of the circulating oil pump structure.

[0042] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0043] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0044] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A circulating oil pump structure, characterized in that: It includes a motor (1), a limiting component (2) connected to the motor (1), and a circulation component connected to the limiting component (2); The limiting component (2) includes a circular tube (21), a first flange (22) disposed at one end of the circular tube (21), and a second flange (23) disposed at the other end of the circular tube (21). The first flange (22) and the second flange (23) are arranged parallel to each other and are both coaxial with the circular tube (21). The first flange (22) is connected to the motor (1), and the second flange (23) is connected to the circulation component. The motor shaft (11) of the motor (1) is coaxially arranged with the round tube (21), and passes through the first flange (22), the round tube (21) and the second flange (23) in sequence and is connected to the circulation assembly; An exhaust port (311) is provided on the circulation assembly.

2. The circulating oil pump structure according to claim 1, characterized in that: The circulation assembly includes a turbine box (31), an impeller (41) disposed in the turbine box (31), an oil suction pipe (32) communicating with the middle of the turbine box (31), and an oil return pipe (42) communicating with the side of the turbine box (31). The turbine box (31) is connected to a second flange (23), the exhaust port (311) is disposed on the turbine box (31), and the impeller (41) is connected to a motor shaft (11).

3. The circulating oil pump structure according to claim 2, characterized in that: An exhaust groove (312) is provided on the side of the second flange (23) near the turbine box (31), and the exhaust port (311) is provided at the exhaust groove (312); The second flange (23) has a horizontal projection surface on the turbine box (31), and the exhaust port (311) is located within the horizontal projection surface.

4. The circulating oil pump structure according to claim 2, characterized in that: An annular sealing groove (24) is provided on the side of the second flange (23) near the turbine box (31). The sealing groove (24) is coaxially arranged with the round pipe (21), and a skeleton oil seal (25) is provided in the sealing groove (24).

5. The circulating oil pump structure according to claim 1, characterized in that: An oil drain port (211) is provided at the end of the circular tube (21) near the second flange (23), and at least one oil drain port (211) is provided.

6. The circulating oil pump structure according to claim 1, characterized in that: A cleaning port (212) is provided at the end of the circular tube (21) near the first flange (22).

7. A fuel tank, characterized in that: It includes an oil tank body (51), a circulating oil pump structure according to any one of claims 1-6 disposed on the oil tank body (51), an oil trough (52) disposed on the oil tank body (51), and an oil outlet (53) disposed at the bottom of the oil tank body (51); The return oil pipe (42) of the circulation component is connected to the oil outlet (53), and the suction oil pipe (32) of the circulation component is connected to the oil tank body (51).

8. The fuel tank according to claim 7, characterized in that: An upper cover (54) is provided on the circulating oil pump structure, and the upper cover (54) is rotatably connected to the oil tank body (51).

9. The fuel tank according to claim 7, characterized in that: A circulating oil inlet pipeline is provided on the oil outlet (53), and a ball valve assembly is provided between the oil outlet (53) and the circulating oil inlet pipeline.

10. The fuel tank according to claim 9, characterized in that: The ball valve assembly includes a ball valve (61), a high-pressure clamp (62), and a PTFE gasket (63). The two ends of the ball valve (61) are respectively connected to the oil outlet (53) and the circulating oil inlet pipeline. The PTFE gasket (63) is sleeved on both ends of the ball valve (61), and the high-pressure clamp (62) is set on the PTFE gasket (63).

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