Automatic control device for auxiliary feeding amount of centrifugal pump

Abstract

The utility model discloses an automatic control device for auxiliary feeding quantity of a centrifugal pump, which belongs to the technical field of centrifugal pumps and comprises a buffer tank, crude oil is stored in the buffer tank, a booster pump, a mixing tank and the centrifugal pump are sequentially connected behind the buffer tank, and an outlet pipeline of the centrifugal pump is connected with a first valve of a three-way electromagnetic valve. A second valve of the three-way solenoid valve is connected with an inlet pipeline of the accident tank; a third valve of the three-way solenoid valve is connected with an oil pipeline; a second pressure sensor is installed on an outlet pipeline of the centrifugal pump, and the pressure sensor and the three-way electromagnetic valve are both connected with a PLC control module. The PLC control module controls opening, closing and opening degrees of three valves on the three-way electromagnetic valve according to data monitored by the pressure sensor in real time, then automatic emptying of the centrifugal pump is achieved, the phenomenon that the centrifugal pump cannot be used for feeding is avoided, the mixing tank enables media in fluid to be refined during normal oil transportation, automatic control is achieved, the workload is reduced, and the working efficiency is improved. And the crude oil output efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of centrifugal pumps, and particularly relates to an automatic control device for assisting the liquid supply of a centrifugal pump. Background Technique

[0002] Multistage centrifugal pumps are one of the main external transportation devices in the first-line oil production. However, in actual production sites, affected by wax, impurities, gas, etc. in the transported medium, multistage centrifugal pumps are prone to problems such as difficulty in supplying liquid and large fluctuations in displacement, resulting in the inability to output crude oil in a timely manner, high equipment maintenance frequency, high labor intensity of personnel, and the breeding of potential safety and environmental protection hazards, which have been plaguing the first-line production. Generally, to solve this problem, the cleaning frequency of the centrifugal pump filter is increased to reduce the impact of the transported medium on the liquid supply of the centrifugal pump. However, due to the frequent cleaning of the filter screen, it will cause environmental pollution and increase the labor intensity of on-site operators. Therefore, it is necessary to design a device that can refine impurities and wax blocks in the transported medium, and at the same time has intelligent emptying, automatic venting, reduces the generation of dirty oil sludge, and does not increase the labor intensity of employees.

[0003] Chinese Utility Model Patent Publication No. CN218817009U discloses a centrifugal pump with a sewage discharge function, including a pump body and a sewage discharge pipe; the pump body includes a driving motor and a pump casing, the output shaft of the driving motor is connected to the impeller shaft of the pump casing through a coupling, and the surface of the pump casing is provided with a water inlet pipe and a water outlet pipe. This centrifugal pump with a sewage discharge function filters the dirt in the sewage through a filter hopper and a filter pipe, and the dirt enters the sewage discharge box through a connecting pipe for centralized cleaning. The water filtered by the filter hopper enters the pump casing through the sewage discharge pipe and the water inlet pipe to make a high-speed rotation movement, and finally discharges from the water outlet pipe. This centrifugal pump with a sewage discharge function can filter the dirt in the sewage, prevent the dirt from entering the pump casing, thus avoiding the long-term precipitation of sundries and affecting the normal use of the centrifugal pump, being convenient to use, enhancing the sewage discharge effect, extending the service life of the machine, and at the same time, the dirt accumulates in the sewage discharge box, which is convenient to take out for centralized cleaning, improving the cleaning work efficiency. However, the sewage discharge box of this invention still needs to be cleaned manually regularly, and the sealing is not fixed well, there is a risk of leakage.

[0004] Chinese Utility Model Patent Publication No. CN210033875U discloses a centrifugal pump evacuation device, which includes a centrifugal pump, a check valve, a liquid outlet pipe, a jet ejector, a liquid guiding valve, a liquid guiding pipe, an evacuation valve, and an evacuation pipe. The outlet end of the centrifugal pump is connected to the liquid outlet pipe, and a check valve is provided on the liquid outlet pipe. The liquid inlet end of the inlet pipe of the jet ejector is connected to the liquid guiding pipe, and a liquid guiding valve is provided on the liquid guiding pipe. The liquid guiding pipe is connected to the liquid outlet pipe, and the connection point is located in front of the check valve in the liquid outlet direction. The side branch pipe of the jet ejector is connected to the evacuation pipe, and an evacuation valve is provided on the evacuation pipe. The evacuation pipe is communicated with the cavity of the centrifugal pump. Its structure is simple, easy to operate and use, and has automatic control. It uses the liquid with a certain pressure accumulated in the liquid outlet pipe to provide energy to suck and discharge the air in the centrifugal pump without the need for other energy sources to provide power. However, during the discharge process, some crude oil will be carried into the pipe, and this invention does not solve the technical effects of zero emission and zero pollution proposed in this patent. Utility Model Content

[0005] The present utility model proposes a centrifugal pump auxiliary volume increase automatic control device to solve the technical problems existing in the prior art, such as the influence of impurities in the transported medium on the crude oil output efficiency, the phenomenon of non-volume increase of the centrifugal pump, and the large working intensity of the operator.

[0006] To achieve the above purpose, the present utility model adopts the following technical solutions.

[0007] A centrifugal pump auxiliary volume increase automatic control device includes a buffer tank. The outlet of the buffer tank is sequentially connected to a booster pump, a mixing tank, and a centrifugal pump. The outlet pipeline of the centrifugal pump is connected to the first valve of a three-way solenoid valve. The second valve of the three-way solenoid valve is connected to the inlet pipeline of an accident tank, and the third valve of the three-way solenoid valve is connected to an oil transportation pipeline; a second pressure sensor is installed on the outlet pipeline of the centrifugal pump. Both the second pressure sensor and the three-way solenoid valve are connected to a PLC control module. The PLC control module is used to control the three-way solenoid valve according to the data monitored by the pressure sensor.

[0008] A fourth valve is provided on the outlet pipeline of the buffer tank, and the fourth valve is connected to the PLC control module.

[0009] A first pressure sensor is installed on the inlet pipeline of the booster pump, and the first pressure sensor is connected to the PLC control module.

[0010] The PLC control module is also used to control the state of the three-way solenoid valve by comparing the real-time pressure value monitored by the first pressure sensor with the pressure preset value.

[0011] The internal structure of the mixing tank is arranged in a three-section layout. The front section is a cutting structure, the middle section is a spiral structure, and the rear section is a rectifying structure.

[0012] The cutting structure is a rotating double-edge blade.

[0013] The rectifying structure is an inverted horn shape. The large-diameter part of the horn is connected to the middle-section spiral structure, and the small-diameter part of the horn is connected to the outlet of the mixing tank.

[0014] The outlet pipe of the accident tank is also connected to the inlet pipe of the booster pump.

[0015] A liquid level gauge is arranged in the accident tank, and the liquid level gauge is connected to the PLC control module.

[0016] A fifth valve is arranged on the outlet pipe of the accident tank, and the fifth valve is connected to the PLC control module.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] An automatic control device for assisting the pumping volume of a centrifugal pump disclosed by the utility model is highly automated. From the pressurization of crude oil, mixing treatment, monitoring and protection of the centrifugal pump, to the automatic handling of abnormal situations, almost no manual intervention is required, greatly reducing the real-time monitoring requirements of operators and the manual adjustment workload; through the cooperation of the second pressure sensor and the PLC control module, the outlet pressure of the centrifugal pump is monitored in real time, and then the PLC control module automatically adjusts the working state of the three-way solenoid valve according to the real-time data, quickly responding to abnormal pressure changes, effectively avoiding the phenomenon of non-pumping volume caused by reasons such as overloading or cavitation of the centrifugal pump; the PLC control module is connected to the sensor and the three-way solenoid valve, and makes control according to the preset logic and the real-time data monitored by the sensor, effectively coordinating the work of each component, simplifying the operation process, and reducing the burden on operators. In the whole process, the booster pump and the mixing tank pressurize the crude oil and refine the medium, reducing the energy loss of the particulate medium on the fluid flow, improving the flow efficiency of the crude oil, and further enhancing the crude oil transportation efficiency.

[0019] Furthermore, the cutting structure in the mixing tank is a rotating double-edge blade design, which can effectively cut and remove large particulate impurities and solid suspended matters in the crude oil flowing out of the booster pump, refine the medium in the crude oil, reduce the risk of blockage of the subsequent centrifugal pump and pipeline system, keep the conveying medium clean, ensure the pump efficiency and pipeline smoothness, and effectively improve the crude oil transportation efficiency.

[0020] Furthermore, the rectifying structure in the mixing tank is an inverted horn shape. By smoothing the fluid flow, reducing eddy currents and turbulence, the possibility of impurity aggregation is indirectly reduced, further enhancing the transportation efficiency and stability.

[0021] Furthermore, the automatic liquid level monitoring of the accident tank and the PLC control module receive the liquid level data and then control the opening and closing state of the fifth valve, ensuring the recycling of resources and the self-recovery ability of the system, reducing the work of manual inspection and manually opening and closing valves, further enhancing the crude oil transportation efficiency, and optimizing the operation process. Brief Description of the Drawings

[0022] Figure 1 It is a schematic diagram of an automatic control device for assisting the flow rate of a centrifugal pump;

[0023] Figure 2 It is a schematic diagram of the connection of the control module;

[0024] Figure 3 It is a schematic diagram of a booster pump and a mixing tank;

[0025] Figure 4 It is a 3D schematic diagram of the automatic control device for assisting the flow rate of a centrifugal pump.

[0026] Number description: 1. Buffer tank; 2. Booster pump; 3. Mixing tank; 4. Centrifugal pump; 5. Second pressure sensor; 6. Oil pipeline; 7. PLC control module; 8. Three-way solenoid valve; 9. Accident tank; 10. First valve; 11. Second valve; 12. Third valve; 13. Fourth valve; 14. Fifth valve; 15. Liquid level gauge; 16. First pressure sensor. Detailed Embodiment

[0027] To further understand the content of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments are only for explaining the present invention and not for limiting it.

[0028] See Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , which includes a buffer tank 1. The outlet pipeline of the buffer tank 1 is connected to the inlet pipeline of the booster pump 2. The outlet pipeline of the booster pump 2 is connected to the inlet pipeline of the mixing tank 3. The outlet pipeline of the mixing tank 3 is connected to the inlet pipeline of the centrifugal pump 4. The outlet pipeline of the centrifugal pump 4 is connected to a three-way solenoid valve 8. The three-way solenoid valve 8 includes three valves. The centrifugal pump 4 is connected to the first valve 10 of the three-way solenoid valve 8. The second valve 11 of the three-way solenoid valve 8 is connected to the inlet pipeline of the accident tank 9. The third valve 12 of the three-way solenoid valve 8 is connected to the oil pipeline 6. The outlet pipeline of the accident tank 9 is connected to the inlet pipeline of the booster pump 2 to form a loop. A fourth valve 13 is provided on the outlet pipeline of the buffer tank 1, and a fifth valve 14 is provided on the outlet pipeline of the accident tank 9. A first pressure sensor 16 is provided on the inlet pipeline of the booster pump 2, and a second pressure sensor 5 is provided on the outlet pipeline of the centrifugal pump 4. The internal structure of the mixing tank 3 is arranged in a three-section layout as shown in Figure 3As shown, the front section inside the mixing tank 3 has a cutting structure formed by rotating double blades. The middle section inside the mixing tank 3 is a spiral structure, and the rear section inside the mixing tank 3 is a rectifying structure. The rectifying structure is a resulting horn shape. The large-diameter part of the horn is connected to the spiral structure in the middle section of the mixing tank 3, and the small-diameter part of the horn is connected to the outlet of the mixing tank 3. Among them, the fifth valve 14, the three-way solenoid valve 8, the first pressure sensor 16, the second pressure sensor 5, and the liquid level gauge 15 are all connected to the PLC control module 7. The PLC control module 7 controls the fifth valve 14 and the three-way solenoid valve 8 according to the data monitored by the first pressure sensor 16, the second pressure sensor 5, and the liquid level gauge 15.

[0029] An automatic control device for assisting the pumping volume of a centrifugal pump and its implementation method:

[0030] The buffer tank 1 is filled with crude oil. A fourth valve 13 is installed on the outlet pipeline of the buffer tank 1. The buffer tank 1 is connected to the booster pump 2 through the fourth valve 13. The fourth valve 13 is always kept open to ensure that the crude oil continuously flows into the booster pump 2. The outlet pipeline of the booster pump 2 is connected to the inlet pipeline of the mixing tank 3. The booster pump 2 is used to increase the pressure of the fluid at the inlet of the mixing tank 3 to form a high-speed fluid, improve the filling degree of the crude oil in the mixing tank 3, and further enhance the stirring ability in the mixing tank 3. The high-speed crude oil fluid enters the mixing tank 3. First, it passes through the cutting structure in the front section of the mixing tank 3. The double-blade rotating device in this structure cuts large particles, impurities, or broken wax blocks in the crude oil fluid, changes its liquid-solid two-phase flow pattern, reduces the particle size in the crude oil fluid, and realizes the refinement of the crude oil medium. The refined crude oil fluid enters the middle section of the mixing tank 3. The spiral structure in the middle section of the mixing tank 3 further stirs and mixes the refined crude oil fluid, making the medium state in the crude oil evenly mixed. After the medium is fully and evenly mixed, the crude oil fluid finally passes through the rectifying structure in the rear section of the mixing tank 3. The rectifying structure is in the shape of a horn. The large diameter of the horn is connected to the middle section of the mixing tank 3, and the small diameter of the horn is connected to the outlet part of the mixing tank 3. The rectifying structure further combs the conveying direction of the evenly mixed crude oil fluid to ensure that the crude oil fluid can be evenly and stably input into the centrifugal pump 4 connected to the mixing tank 3. In this embodiment, the centrifugal pump 4 is a horizontal multi-stage centrifugal pump. The centrifugal pump 4 receives the crude oil from the mixing tank 3 and increases the flow rate of the crude oil through the centrifugal force of the centrifugal pump 4, so as to efficiently transport the crude oil to the subsequent pipeline.

[0031] Since there may be gas in the centrifugal pump 4, the gas will cause the centrifugal pump to be unable to pump crude oil, resulting in abnormal operation. Therefore, before starting normal oil transportation, the centrifugal pump 4 needs to be emptied, and the crude oil with gas is discharged into the accident tank 9. A second pressure sensor 5 is provided on the outlet pipeline of the centrifugal pump 4. The PLC control module 7 is set with a preset value of the second pressure sensor 5. The pressure preset value of the second pressure sensor is 2MP. The second pressure sensor 5 monitors the crude oil pressure data of the outlet pipeline of the centrifugal pump 4 in real time and sends the data to the PLC control module 7. When the PLC control module 7 determines that the crude oil pressure is less than 2MP, the PLC control module 7 controls the first valve 10 and the second valve 11 of the three-way solenoid valve 8 to open. At this time, the third valve 12 of the three-way solenoid valve 8 is in a closed state. The crude oil with gas is input into the accident tank 9 through the first valve 10 and the second valve 11 of the three-way solenoid valve 8. When the pressure value monitored by the second pressure sensor 5 is greater than or equal to 2MP, the second pressure sensor 5 sends a signal that the pressure and flow meet the preset value to the PLC control module 7. After receiving the signal, the PLC control module 7 sends a control instruction to the three-way solenoid valve 8 to control its second valve 11 to close and the third valve 12 to open. At this time, the first valve 10 is in an open state. The crude oil fluid with increased flow velocity by the centrifugal pump 4 enters the oil transportation pipeline 6 through the first valve 10 and the third valve 12 for normal oil transportation.

[0032] Preferably, a liquid level gauge 15 is provided in the accident tank 9. The liquid level gauge 15 monitors the crude oil liquid level in the accident tank 9 in real time. The PLC control module 7 is set with a first liquid level preset value and a second liquid level preset value for the accident tank 9. The first liquid level preset value is greater than the second liquid level preset value. If the monitored liquid level value by the liquid level gauge 15 is greater than or equal to the first liquid level preset value, the liquid level gauge 15 sends a signal to the PLC control module 7. The PLC control module 7 controls the fifth valve 14 on the outlet pipeline of the accident tank 9 to open. The crude oil in the accident tank 9 is input into the booster pump 2 through the fifth valve 14. The crude oil in the accident tank 9 is pumped into the mixing tank 3 again by the booster pump 2 for refining the crude oil medium, and finally enters the oil transportation pipeline 6 through the centrifugal pump 4 and the three-way solenoid valve for crude oil output. If the monitored liquid level value by the liquid level gauge 15 is less than or equal to the second liquid level preset value, the PLC control module 7 controls the fifth valve 14 to close.

[0033] Preferably, a first pressure sensor 16 is provided on the inlet pipeline of the booster pump 2. The first pressure sensor 16 monitors the crude oil pressure input into the booster pump 2 in real time. If the current crude oil pressure value is greater than the pressure value at the start of the process, it indicates that there is impurity accumulation in the mixing tank 3 and the mixing tank 3 needs to be cleaned. Therefore, the first pressure sensor 16 sends a pause signal to the PLC control module 7. The PLC control module 7 sends a control signal to the fourth valve 13 to close. The fourth valve 13 closes and the process pauses, and the staff cleans the mixing tank 3.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the specific implementation manners of the present invention, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. A centrifugal pump auxiliary loading automatic control device, characterized in that: The invention comprises a buffer tank (1), wherein the outlet of the buffer tank (1) is connected to a booster pump (2), a mixing tank (3) and a centrifugal pump (4) in sequence, the outlet pipeline of the centrifugal pump (4) is connected to a first valve (10) of a three-way solenoid valve (8), the second valve (11) of the three-way solenoid valve (8) is connected to an inlet pipeline of an accident tank (9), and the third valve (12) of the three-way solenoid valve (8) is connected to an oil pipeline (6); a second pressure sensor (5) is installed on the outlet pipeline of the centrifugal pump (4), the second pressure sensor (5) and the three-way solenoid valve (8) are both connected to a PLC control module (7), and the PLC control module (7) is used to control the three-way solenoid valve (8) according to data monitored by the second pressure sensor (5).

2. The centrifugal pump auxiliary loading automatic control device according to claim 1, characterized in that: A fourth valve (13) is provided on the outlet pipe of the buffer tank (1), and the fourth valve (13) is connected to the PLC control module (7).

3. The centrifugal pump auxiliary loading automatic control device according to claim 1, characterized in that: A first pressure sensor (16) is installed on the inlet pipe of the booster pump (2), and the first pressure sensor (16) is connected to the PLC control module (7).

4. The centrifugal pump auxiliary loading automatic control device according to claim 3 is characterized in that: The PLC control module (7) is also used to control the state of the three-way solenoid valve (8) based on the comparison between the real-time pressure value monitored by the first pressure sensor (16) and the preset pressure value.

5. The centrifugal pump auxiliary loading automatic control device according to claim 1, characterized in that: The internal structure of the mixing tank (3) is arranged in three sections, the front section is a cutting structure, the middle section is a spiral structure, and the rear section is a rectifying structure.

6. The centrifugal pump auxiliary loading automatic control device according to claim 5, characterized in that: The cutting structure is a rotating double-edged blade.

7. The centrifugal pump auxiliary loading automatic control device according to claim 5, characterized in that: The rectification structure is in the shape of an inverted trumpet, the large-diameter portion of the trumpet is connected to the middle spiral structure, and the small-diameter portion of the trumpet is connected to the outlet of the mixing tank (3).

8. The centrifugal pump auxiliary loading automatic control device according to claim 1, characterized in that: The outlet pipe of the emergency tank (9) is also connected to the inlet pipe of the booster pump (2).

9. The centrifugal pump auxiliary loading automatic control device according to claim 8, characterized in that: A liquid level meter (15) is arranged in the emergency tank (9), and the liquid level meter (15) is connected to the PLC control module (7).

10. The centrifugal pump auxiliary loading automatic control device according to claim 8, characterized in that: A fifth valve (14) is provided on the outlet pipe of the emergency tank (9), and the fifth valve (14) is connected to the PLC control module (7).

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