Crude oil onshore self-priming pump

Abstract

A crude oil onshore self-priming pump, a motor, a bearing box, a centrifugal pump and a self-priming tank are sequentially fixed on the upper surface of a base; a motor shaft of the motor is coaxially fixedly connected with a power input shaft of the bearing box through a shaft coupling, a power output shaft of the bearing box is coaxially fixedly connected with a power input shaft of the centrifugal pump; an oil outlet of the self-priming tank is in communication with an oil inlet of the centrifugal pump; a backflow jet device is arranged in a crude oil storage tank, and the oil inlet of the self-priming tank is in communication with the inside of the crude oil storage tank through the backflow jet device. The crude oil onshore self-priming pump is designed based on the centrifugal pump, and the backflow jet technology is coupled to assist the centrifugal pump to work on the crude oil medium, so that the high-viscosity crude oil can be reliably and stably transported, the problems of rotor idling and mechanical seal dry grinding caused by no medium in the pump body at the beginning of work are solved, the gas-liquid mixed transportation of the centrifugal pump can be avoided, the working efficiency of the centrifugal pump is improved, and the equipment failure rate of the centrifugal pump is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of petroleum industry pump technology, and in particular relates to a self-priming pump for crude oil unloading. Background Technology

[0002] Crude oil onshore pumps are key equipment used to transport crude oil from offshore platforms, floating production storage and offloading vessels, or subsea pipelines to onshore terminals or storage tanks. They are mainly used in the offshore oil and gas development field and are also key equipment to ensure that crude oil can be safely and efficiently transported onshore for processing.

[0003] Due to the high viscosity of crude oil, the long distances of the pipelines, and the complexity of the routes, the flow resistance of crude oil within the pipelines is high. Therefore, positive displacement pumps, including plunger pumps, piston pumps, and screw pumps, are generally used for crude oil delivery to shore. However, during the initial operation phase, positive displacement pumps require the rotor to run dry due to the absence of internal medium, resulting in a high failure rate of the mechanical seal. Furthermore, the periodic discharge of positive displacement pumps can cause pressure pulsations, which can easily trigger resonance in long-distance pipelines. Therefore, buffer tanks or pulsation dampers must be added, further increasing the complexity of the pumping system.

[0004] Chinese patent application CN216842189U discloses a high-viscosity crude oil mixing pump. This design is based on a screw pump, where two sets of conveying screws are driven by a driven gear and a driving gear to mix and convey the crude oil product, which is then discharged from the outlet. Additionally, the design includes a cooling assembly containing a coolant circulation pump and a motor. By adjusting the screw drive and using guide blocks and ball bearings, the cooling assembly moves horizontally back and forth outside the pump body to achieve cooling. However, this design still does not solve the problems of rotor idling and mechanical seal dry running caused by the lack of internal medium during the initial operation phase. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides a self-priming pump for crude oil unloading. It is designed based on a centrifugal pump and incorporates reflux jet technology to assist the centrifugal pump in performing work on the crude oil medium. This enables reliable and stable transportation of high-viscosity crude oil and solves problems such as rotor idling and mechanical seal dry running caused by the lack of internal medium during the initial stage of pump operation. Furthermore, it avoids the situation of gas-liquid mixing in the centrifugal pump, improves the working efficiency of the centrifugal pump, and reduces the equipment failure rate of the centrifugal pump.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a crude oil onshore self-priming pump, comprising a base, a motor, a coupling, a bearing housing, a centrifugal pump, a self-priming tank, and a reflux jet device; the motor, bearing housing, centrifugal pump, and self-priming tank are sequentially fixed on the upper surface of the base; the motor shaft of the motor is coaxially fixed to the power input shaft of the bearing housing through the coupling, and the power output shaft of the bearing housing is coaxially fixed to the power input shaft of the centrifugal pump; the oil outlet of the self-priming tank is connected to the oil inlet of the centrifugal pump; the reflux jet device is installed inside the crude oil storage tank, and the oil inlet of the self-priming tank is connected to the interior of the crude oil storage tank through the reflux jet device.

[0007] The centrifugal pump's outlet is connected to a transition pipeline, and a crude oil return pipeline is connected to the middle of the transition pipeline. The crude oil return pipeline is connected to the return jet device, and a crude oil return control valve is installed on the crude oil return pipeline.

[0008] The oil outlet end of the transition pipeline is connected to the crude oil output main pipe, and a crude oil output control valve is installed on the crude oil output main pipe.

[0009] The self-priming tank includes a tank body, a support frame, an oil inlet pipe, an oil outlet pipe, a first partition, and a second partition. The support frame is fixedly installed on the upper surface of the base. The tank body is vertically fixed to the top of the support frame, and the top plate of the tank body has a curved structure with a vent pipe interface at the center of the top plate. The first partition is horizontally fixed inside the tank body below the vent pipe interface. The second partition is horizontally fixed inside the tank body below the first partition, and the second partition and the first partition are staggered. The oil inlet pipe passes through the oil inlet at the bottom of the self-priming tank in a sealed manner, and the oil outlet end of the oil inlet pipe is connected to the upper chamber of the first partition. The oil inlet end of the oil inlet pipe is also connected to a return jet device. The oil inlet end of the oil outlet pipe is connected to the oil outlet at the bottom of the self-priming tank, and the oil outlet end of the oil outlet pipe is connected to the oil inlet of the centrifugal pump.

[0010] A vent pipe interface is connected to the outside of the tank opening cover plate of the crude oil storage tank; a vent pipe is connected to the outside of the vent pipe interface, and the vent pipe is connected to the vent pipe interface.

[0011] The self-priming tank is equipped with a sealing float that is used in conjunction with the vent pipe interface. The sealing float floats on the surface of the crude oil inside the tank.

[0012] The reflux jet device includes an outer sleeve, an inner sleeve, a pipe joint, a conical baffle, an annular baffle, a jet pipe, and a reflux guide pipe. The outer sleeve is sealed through the tank opening cover of the crude oil storage tank and is coaxially fitted onto the outside of the inner sleeve. The inner sleeve is sealed through the top sealing plate of the outer sleeve and is connected to the oil inlet pipe of the self-priming tank. The annular baffle is horizontally fixed inside the lower end of the outer sleeve. The conical baffle is located above the annular baffle, with its large-diameter end fixedly connected to the inner wall of the outer sleeve, and its small-diameter end sealed to the bottom opening of the inner sleeve via the pipe joint. The jet pipe is coaxially fixed at the central hole of the annular baffle, with the crude oil jet outlet of the jet pipe aligned with the central hole of the pipe joint, and the crude oil inlet of the jet pipe aligned with the bottom sealing plate of the outer sleeve. A crude oil reflux pipe interface is connected to the upper part of the outer sleeve wall and is connected to the crude oil reflux pipeline.

[0013] The inner sleeve adopts a multi-stage diameter reduction structure. The large-diameter end of the inner sleeve faces upward and is connected to the oil inlet pipe of the self-priming tank, while the small-diameter end of the inner sleeve faces downward and is sealed and connected to the pipe joint.

[0014] Several crude oil inlets are provided on the outer sleeve wall between the conical baffle and the annular baffle, and the crude oil inlets are evenly distributed along the circumference.

[0015] A filter cover is fixedly fitted onto the outer sleeve outside the crude oil inlet.

[0016] The beneficial effects of this utility model are: This utility model relates to a self-priming pump for crude oil unloading. It is designed based on a centrifugal pump and incorporates reflux jet technology to assist the centrifugal pump in performing work on the crude oil medium. This enables reliable and stable transportation of high-viscosity crude oil. It also solves problems such as rotor idling and mechanical seal dry running caused by the lack of internal medium during the initial stage of pump operation. Furthermore, it avoids gas-liquid mixing during centrifugal pump operation, improves the working efficiency of the centrifugal pump, and reduces the equipment failure rate of the centrifugal pump. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a self-priming pump for crude oil unloading according to this utility model; Figure 2 This is a cross-sectional view of the self-priming can of this utility model. Figure 3 This is a cross-sectional structural schematic diagram of the reflux jet device of this utility model; In the diagram, 1—base, 2—motor, 3—coupling, 4—bearing housing, 5—centrifugal pump, 6—self-priming tank, 7—return jet device, 8—crude oil storage tank, 9—transition pipeline, 10—crude oil return pipeline, 11—crude oil return control valve, 12—crude oil output main pipe, 13—crude oil output control valve, 14—tank body, 15—support frame, 16—oil inlet pipeline, 17—oil outlet pipeline, 18—first partition, 19—second partition, 20—vent pipe interface, 21—tank opening cover plate, 22—vent pipe interface, 23—vent pipe, 24—blocking float, 25—outer sleeve, 26—inner sleeve, 27—pipe joint, 28—conical baffle, 29—annular baffle, 30—jet pipe, 31—return oil guide pipe, 32—crude oil inlet, 33—filter cover, 34—crude oil return pipe interface. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] like Figures 1-3 As shown, a self-priming pump for crude oil unloading includes a base 1, a motor 2, a coupling 3, a bearing housing 4, a centrifugal pump 5, a self-priming tank 6, and a reflux jet device 7. The motor 2, bearing housing 4, centrifugal pump 5, and self-priming tank 6 are sequentially fixed on the upper surface of the base 1. The motor shaft of the motor 2 is coaxially fixed to the power input shaft of the bearing housing 4 through the coupling 3, and the power output shaft of the bearing housing 4 is coaxially fixed to the power input shaft of the centrifugal pump 5. The oil outlet of the self-priming tank 6 is connected to the oil inlet of the centrifugal pump 5. The reflux jet device 7 is installed inside the crude oil storage tank 8, and the oil inlet of the self-priming tank 6 is connected to the interior of the crude oil storage tank 8 through the reflux jet device 7.

[0020] The centrifugal pump 5 has an oil outlet connected to a transition pipe 9. A crude oil return pipe 10 is connected to the middle of the transition pipe 9. The crude oil return pipe 10 is connected to the return jet device 7. A crude oil return control valve 11 is installed on the crude oil return pipe 10.

[0021] The oil outlet end of the transition pipeline 9 is connected to the crude oil output main pipe 12, and a crude oil output control valve 13 is installed on the crude oil output main pipe 12.

[0022] The self-priming tank 6 includes a tank body 14, a support frame 15, an oil inlet pipe 16, an oil outlet pipe 17, a first partition 18, and a second partition 19. The support frame 15 is fixedly installed on the upper surface of the base 1. The tank body 14 is vertically fixed to the top of the support frame 15. The top plate of the tank body 14 has a curved structure, and a vent pipe interface 20 is provided at the center of the top plate of the tank body 14. The first partition 18 is horizontally fixed inside the tank body 14, diagonally below the vent pipe interface 20. The second partition 19 is horizontally fixed. The first partition 18 is fixedly installed inside the tank body 14 at an angle downwards, and the second partition 19 is staggered with the first partition 18; the oil inlet pipe 16 is sealed through the oil inlet at the bottom of the self-priming tank 6, the oil outlet end of the oil inlet pipe 16 is connected to the upper chamber of the first partition 18, and the oil inlet end of the oil inlet pipe 16 is connected to the return jet device 7; the oil outlet end of the oil outlet pipe 17 is connected to the oil outlet at the bottom of the self-priming tank 6, and the oil outlet end of the oil outlet pipe 17 is connected to the oil inlet of the centrifugal pump 5.

[0023] A gas duct interface 22 is externally connected to the tank opening cover plate 21 of the crude oil storage tank 8; a gas duct 23 is externally connected to the gas duct interface 20, and the gas duct 23 is connected to the gas duct interface 22.

[0024] Inside the tank body 14 of the self-priming tank 6, there is a sealing float 24 that is used in conjunction with the vent pipe interface 20. The sealing float 24 floats on the surface of the crude oil inside the tank body 14.

[0025] The reflux jet device 7 includes an outer sleeve 25, an inner sleeve 26, a pipe joint 27, a conical baffle 28, an annular baffle 29, a jet pipe 30, and a reflux guide pipe 31. The outer sleeve 25 passes through the tank opening cover plate 21 of the crude oil storage tank 8 in a sealed manner. The outer sleeve 25 is coaxially fitted outside the inner sleeve 26. The inner sleeve 26 passes through the top sealing plate of the outer sleeve 25 in a sealed manner. The inner sleeve 26 is connected to the oil inlet pipe 16 of the self-priming tank 6. The annular baffle 29 is horizontally fixed inside the lower end of the outer sleeve 25. The conical baffle 28 is located at the annular baffle. Above 29, the large-diameter end of the conical baffle 28 is fixedly connected to the inner wall of the outer sleeve 25, and the small-diameter end of the conical baffle 28 is sealed and connected to the bottom end of the inner sleeve 26 through the pipe joint 27; the jet pipe 30 is coaxially fixed at the center hole of the annular baffle 29, the crude oil jet port of the jet pipe 30 is directly opposite to the center hole of the pipe joint 27, and the crude oil inlet of the jet pipe 30 is directly opposite to the bottom end sealing plate of the outer sleeve 25; a crude oil return pipe interface 34 is connected to the upper part of the pipe wall of the outer sleeve 25, and the crude oil return pipe interface 34 is connected to the crude oil return pipe 10.

[0026] The inner sleeve 26 adopts a multi-stage diameter reduction structure. The large diameter end of the inner sleeve 26 faces upward and is connected to the oil inlet pipe 16 of the self-priming tank 6. The small diameter end of the inner sleeve 26 faces downward and is sealed and connected to the pipe joint 27.

[0027] A plurality of crude oil inlets 32 are provided on the outer sleeve 25 between the conical baffle 28 and the annular baffle 29, and the plurality of crude oil inlets 32 are evenly distributed along the circumferential direction.

[0028] A filter cover 33 is fixedly installed on the outer sleeve 25 outside the crude oil inlet 32. The filter cover 33 can block hard particles such as asphalt, gravel, and metal fragments mixed in the crude oil in the crude oil storage tank 8 from the outside of the crude oil inlet 32, ensuring that the crude oil flowing into the crude oil inlet 32 ​​has a high degree of cleanliness.

[0029] The following describes a single use of this utility model with reference to the accompanying drawings: Before starting work, crude oil is injected into the tank body 14 of the self-priming tank 6. The injected crude oil is of the same type as the crude oil stored in the crude oil storage tank 8 until the crude oil completely fills the tank body 14 of the self-priming tank 6. At the same time, the sealing float 24 automatically seals the vent pipe interface 20 under the buoyancy of the crude oil in the tank body 14. Then, the crude oil return control valve 11 is adjusted to the open state, and the crude oil output control valve 13 is adjusted to the closed state.

[0030] Start motor 2 to drive centrifugal pump 5. Under the action of centrifugal pump 5, crude oil in tank body 14 of self-priming tank 6 is sucked into centrifugal pump 5 through oil outlet pipe 17, and then discharged by centrifugal pump 5 and enters transition pipe 9. Afterwards, it returns to tank body 14 of self-priming tank 6 through crude oil return pipe 10, crude oil return pipe interface 34, outer sleeve 25, return oil guide pipe 31, jet pipe 30, pipe joint 27, inner sleeve 26 and oil inlet pipe 16. At the same time, in the initial stage of crude oil being sucked into centrifugal pump 5, the crude oil level in tank body 14 of self-priming tank 6 will drop. The sealing float 24 will drop synchronously with the crude oil level in tank body 14 of self-priming tank 6, thereby releasing the blockage. The sealing of the vent pipe interface 20 enables communication between the upper chamber of the self-priming tank 6 body 14 and the internal chamber of the crude oil storage tank 8 through the air guide pipe 23. When the air in the crude oil return pipe 10, crude oil return pipe interface 34, outer sleeve 25, return oil guide pipe 31, jet pipe 30, pipe joint 27, inner sleeve 26 and oil inlet pipe 16 enters the self-priming tank 6 body 14 with the flowing crude oil, it will directly enter the upper chamber of the self-priming tank 6 body 14. As the crude oil level in the self-priming tank 6 body 14 rises, this air will be discharged into the crude oil storage tank 8 through the air guide pipe 23, thereby preventing the air in the pipeline from entering the centrifugal pump 5 and thus avoiding gas-liquid mixing in the centrifugal pump 5.

[0031] During the operation of centrifugal pump 5, under the action of pressure difference, the crude oil in crude oil storage tank 8 first flows through filter cover 33, and then flows into the cavity between conical baffle 28 and annular baffle 29 through crude oil inlet 32. Then, it merges with the return crude oil flowing out of jet pipe 30 at pipe joint 27. The merged crude oil then flows into tank body 14 of self-priming tank 6 through inner sleeve 26 and oil inlet pipe 16, so that the amount of crude oil in tank body 14 of self-priming tank 6 gradually increases and the crude oil level gradually rises. As the crude oil level rises, until the crude oil refills tank body 14 of self-priming tank 6, the sealing float 24 automatically seals the vent pipe interface 20 again. At this time, all preparations before crude oil output are completed.

[0032] Once the self-priming tank 6 is refilled with crude oil, the crude oil output control valve 13 is opened. The crude oil discharged by the centrifugal pump 5 flows smoothly into the crude oil output main pipe 12 through the transition pipe 9, thereby achieving stable crude oil output. At the same time, the crude oil flowing into the crude oil return pipe 10 maintains the initial circulation state and assists the crude oil flowing in from the crude oil inlet 32 ​​to do work through the jet action generated at the jet pipe 30, so that the crude oil can smoothly enter the self-priming tank 6 and achieve reliable and stable transportation of high-viscosity crude oil.

[0033] The solutions in the embodiments are not intended to limit the scope of protection of this utility model. All equivalent implementations or modifications that do not depart from the scope of protection of this utility model are included in the scope of protection of this utility model.

Claims

1. A self-priming pump for crude oil unloading, characterized in that: The system includes a base, a motor, a coupling, a bearing housing, a centrifugal pump, a self-priming tank, and a reflux jet device. The motor, bearing housing, centrifugal pump, and self-priming tank are sequentially fixed on the upper surface of the base. The motor shaft is coaxially fixed to the power input shaft of the bearing housing via the coupling, and the power output shaft of the bearing housing is coaxially fixed to the power input shaft of the centrifugal pump. The oil outlet of the self-priming tank is connected to the oil inlet of the centrifugal pump. The reflux jet device is installed inside the crude oil storage tank, and the oil inlet of the self-priming tank is connected to the interior of the crude oil storage tank via the reflux jet device.

2. The crude oil self-priming pump according to claim 1, characterized in that: The centrifugal pump's outlet is connected to a transition pipeline, and a crude oil return pipeline is connected to the middle of the transition pipeline. The crude oil return pipeline is connected to the return jet device, and a crude oil return control valve is installed on the crude oil return pipeline.

3. The crude oil self-priming pump according to claim 2, characterized in that: The oil outlet end of the transition pipeline is connected to the crude oil output main pipe, and a crude oil output control valve is installed on the crude oil output main pipe.

4. The crude oil self-priming pump according to claim 1, characterized in that: The self-priming tank includes a tank body, a support frame, an oil inlet pipe, an oil outlet pipe, a first partition, and a second partition. The support frame is fixedly installed on the upper surface of the base. The tank body is vertically fixed to the top of the support frame, and the top plate of the tank body has a curved structure with a vent pipe interface at the center of the top plate. The first partition is horizontally fixed inside the tank body below the vent pipe interface. The second partition is horizontally fixed inside the tank body below the first partition, and the second partition and the first partition are staggered. The oil inlet pipe passes through the oil inlet at the bottom of the self-priming tank in a sealed manner, and the oil outlet end of the oil inlet pipe is connected to the upper chamber of the first partition. The oil inlet end of the oil inlet pipe is also connected to a return jet device. The oil inlet end of the oil outlet pipe is connected to the oil outlet at the bottom of the self-priming tank, and the oil outlet end of the oil outlet pipe is connected to the oil inlet of the centrifugal pump.

5. The crude oil self-priming pump according to claim 4, characterized in that: A vent pipe interface is connected to the outside of the tank opening cover plate of the crude oil storage tank; a vent pipe is connected to the outside of the vent pipe interface, and the vent pipe is connected to the vent pipe interface.

6. The crude oil onshore self-priming pump according to claim 4, characterized in that: The self-priming tank is equipped with a sealing float that is used in conjunction with the vent pipe interface. The sealing float floats on the surface of the crude oil inside the tank.

7. A self-priming pump for crude oil unloading according to claim 4, characterized in that: The reflux jet device includes an outer sleeve, an inner sleeve, a pipe joint, a conical baffle, an annular baffle, a jet pipe, and a reflux guide pipe. The outer sleeve is sealed through the tank opening cover of the crude oil storage tank and is coaxially fitted onto the outside of the inner sleeve. The inner sleeve is sealed through the top sealing plate of the outer sleeve and is connected to the oil inlet pipe of the self-priming tank. The annular baffle is horizontally fixed inside the lower end of the outer sleeve. The conical baffle is located above the annular baffle, with its large-diameter end fixedly connected to the inner wall of the outer sleeve, and its small-diameter end sealed to the bottom opening of the inner sleeve via the pipe joint. The jet pipe is coaxially fixed at the central hole of the annular baffle, with the crude oil jet outlet of the jet pipe aligned with the central hole of the pipe joint, and the crude oil inlet of the jet pipe aligned with the bottom sealing plate of the outer sleeve. A crude oil reflux pipe interface is connected to the upper part of the outer sleeve wall and is connected to the crude oil reflux pipeline.

8. A self-priming pump for crude oil unloading according to claim 7, characterized in that: The inner sleeve adopts a multi-stage diameter reduction structure. The large-diameter end of the inner sleeve faces upward and is connected to the oil inlet pipe of the self-priming tank, while the small-diameter end of the inner sleeve faces downward and is sealed and connected to the pipe joint.

9. A self-priming pump for crude oil unloading according to claim 7, characterized in that: Several crude oil inlets are provided on the outer sleeve wall between the conical baffle and the annular baffle, and the crude oil inlets are evenly distributed along the circumference.

10. A self-priming pump for crude oil unloading according to claim 9, characterized in that: A filter cover is fixedly fitted onto the outer sleeve outside the crude oil inlet.

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