Traction suction dredger two-pump series matching method, device, equipment, medium and product

Abstract

The invention discloses a series matching method, device and equipment for two pumps of a trailing suction dredger, a medium and a product. The method comprises the steps that according to loading working condition parameters corresponding to loading requirements, a group of reference rotating speed combinations, meeting series connection matching conditions, of an underwater pump and an in-cabin pump are determined; wherein the serial connection matching conditions comprise a lift discrimination condition for indicating that the total lift of pipeline mud is consistent with the total lift of mud pump mud, a cavitation discrimination condition for indicating that the cavitation margin of the pump in the cabin exceeds a set margin threshold value, and a power discrimination condition for indicating that the power of the underwater pump is lower than a set power threshold value; adjusting the rotating speed on the basis of the reference rotating speed combination, and determining a plurality of groups of extended rotating speed combinations of underwater pumps and in-cabin pumps, which meet series matching conditions, by combining the similar law of the pumps; and combining the reference rotating speed combination with the extended rotating speed combination, and fitting to obtain a rotating speed linear matching relation and a rotating speed adjusting range of the underwater pump and the in-cabin pump which are connected in series. The problems of cavitation risk of the in-cabin pump and power limitation of the underwater pump when the two pumps are connected in series and matched are solved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of dredging technology, and in particular to a method, apparatus, equipment, medium and product for matching two pumps in series on a trailing suction hopper dredger. Background Technology

[0002] In dredging operations at depths of 100 meters, using only submersible pumps for hopper loading is inefficient, necessitating a series connection of submersible pumps and in-hopper pumps. When connecting submersible and in-hopper pumps in series, matching the loading conditions is crucial, meaning determining appropriate rotational speeds for both pumps. If the pump speeds are not properly matched—for example, if the submersible pump speed is too high while the in-hopper pump speed is too low—the submersible pump will have excessive power, potentially leading to motor overload during fluctuations in flow rate and density. Conversely, if the submersible pump speed is too low, its head will be low, resulting in excessive inlet vacuum at the in-hopper pump (which acts as a secondary pump in the series connection) and cavitation. All of these factors negatively impact the safe and stable operation of the mud pump delivery system. Therefore, proper speed matching between the two pumps in a series-connected hopper loading operation at depths of 100 meters is critical, but current technology lacks suitable implementation methods. Summary of the Invention

[0003] This invention provides a method, apparatus, equipment, medium, and product for matching two pumps in series on a trailing suction hopper dredger, which solves the technical problems of cavitation risk of the dredger and power limitation of the submersible pump when the submersible pump and the dredging pump are connected in series under dredging conditions at a water depth of 100 meters.

[0004] In a first aspect, embodiments of the present invention provide a method for matching two pumps in series on a trailing suction hopper dredger, comprising:

[0005] Based on the loading conditions parameters corresponding to the loading requirements, a set of reference speed combinations of submersible pumps and in-tank pumps that meet the series matching conditions are determined; wherein, the series matching conditions include the head discrimination condition indicating that the total mud head of the pipeline is consistent with the total mud head of the mud pump, the cavitation discrimination condition indicating that the cavitation margin of the in-tank pump exceeds the set margin threshold, and the power discrimination condition indicating that the power of the submersible pump is lower than the set power threshold.

[0006] Based on the aforementioned reference speed combination, speed adjustments are made, and combined with the pump similarity law, multiple extended speed combinations of underwater pumps and in-cabin pumps that satisfy the aforementioned series matching conditions are determined.

[0007] By combining the reference speed combination and the extended speed combination, the linear matching relationship of the speed of the underwater pump and the in-cabin pump in series and the speed adjustment range are obtained by fitting.

[0008] Secondly, embodiments of the present invention provide a series matching device for two pumps on a trailing suction hopper dredger, comprising:

[0009] The first determining module is used to determine a set of reference speed combinations of submersible pumps and in-tank pumps that meet the series matching conditions based on the tank loading conditions parameters corresponding to the tank loading requirements. The series matching conditions include a head discrimination condition indicating that the total mud head of the pipeline is consistent with the total mud head of the mud pump, a cavitation discrimination condition indicating that the cavitation margin of the in-tank pump exceeds a set margin threshold, and a power discrimination condition indicating that the power of the submersible pump is lower than a set power threshold.

[0010] The second determining module is used to adjust the speed based on the reference speed combination, and determine multiple extended speed combinations of underwater pumps and in-cabin pumps that meet the series matching conditions by combining the similarity law of pumps.

[0011] The fitting module is used to combine the reference speed combination and the extended speed combination to fit the linear matching relationship of the speed of the submersible pump and the in-chamber pump in series and the speed adjustment range.

[0012] Thirdly, embodiments of the present invention provide an electronic device, including:

[0013] At least one processor; and

[0014] A memory communicatively connected to the at least one processor; wherein,

[0015] The memory stores a computer program that can be executed by the at least one processor to enable the at least one processor to perform the method as described in the first aspect.

[0016] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing computer instructions that cause a processor to execute the method described in the first aspect.

[0017] Fifthly, embodiments of the present invention provide a computer program product, the computer program product including a computer program, which, when executed by a processor, implements the method described in the first aspect.

[0018] The technical solution of this invention determines a set of reference speed combinations for submersible pumps and in-tank pumps that meet the series matching conditions based on the tank loading operating parameters corresponding to the tank loading requirements. The series matching conditions include a head discrimination condition indicating that the total mud head of the pipeline is consistent with the total mud head of the mud pump, a cavitation discrimination condition indicating that the cavitation margin of the in-tank pump exceeds a set margin threshold, and a power discrimination condition indicating that the power of the submersible pump is lower than a set power threshold. Based on the reference speed combinations, speed adjustments are made, and multiple extended speed combinations for submersible pumps and in-tank pumps that meet the series matching conditions are determined by combining the reference speed combinations and the extended speed combinations. Finally, a linear matching relationship and speed adjustment range for the series connection of the submersible pumps and in-tank pumps are obtained by fitting the series speed combinations. This solution addresses the technical challenges of cavitation risk of the dredging pump and power limitation of the submersible pump when the submersible pump and the dredging pump are connected in series under dredging conditions at depths of 100 meters. It conducts speed matching analysis on the two pumps connected in series for dredging, obtains a reasonable speed range and speed regulation relationship between the two pumps, and uses it to guide the speed adjustment of the mud pump during dredging construction, improve the efficiency of dredging in series at depths of 100 meters, and ensure the stable and safe operation of the dredging system.

[0019] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a flowchart of a method for matching two pumps in series on a trailing suction hopper dredger according to Embodiment 1 of the present invention;

[0022] Figure 2 This is a flowchart of a method for matching two pumps in series on a trailing suction hopper dredger according to Embodiment 2 of the present invention;

[0023] Figure 3 This is a schematic diagram of two pumps connected in series on a trailing suction hopper dredger according to Embodiment 2 of the present invention;

[0024] Figure 4 This is a schematic diagram of a flow rate-clean water head curve provided according to Embodiment 2 of the present invention;

[0025] Figure 5 This is a schematic diagram of the flow rate-NPSH curve of an underwater pump according to Embodiment 2 of the present invention;

[0026] Figure 6 This is a schematic diagram of the flow rate-NPSH curve of an in-chamber pump according to Embodiment 2 of the present invention;

[0027] Figure 7 This is a schematic diagram of the efficiency curves of an underwater pump and an in-cabin pump according to Embodiment 2 of the present invention;

[0028] Figure 8 This is a schematic diagram of another flow rate-clean water head curve provided according to Embodiment 2 of the present invention;

[0029] Figure 9 This is a schematic diagram of a linear matching relationship of rotational speed provided according to Embodiment 2 of the present invention;

[0030] Figure 10 This is a schematic diagram of the structure of a trailing suction hopper tandem matching device according to Embodiment 3 of the present invention;

[0031] Figure 11 This is a schematic diagram of the structure of an electronic device that implements an embodiment of the present invention. Detailed Implementation

[0032] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0033] It should be noted that the terms "first," "second," etc., used in this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] Example 1

[0035] Figure 1This is a flowchart illustrating a method for matching two pumps in series on a trailing suction hopper dredger according to Embodiment 1 of the present invention. This embodiment is applicable to situations where underwater pumps and in-tank pumps are connected in series to match dredging conditions. This method can be executed by a two-pump series matching device on the trailing suction hopper dredger. This device can be implemented in software and / or hardware and integrated into an electronic device. Furthermore, the electronic device includes, but is not limited to, computers, laptops, servers, etc.

[0036] like Figure 1 As shown, the method includes:

[0037] S110. Based on the loading conditions parameters corresponding to the loading requirements, determine a set of reference speed combinations for the submersible pump and the in-tank pump that meet the series matching conditions; wherein, the series matching conditions include a head discrimination condition indicating that the total mud head of the pipeline is consistent with the total mud head of the mud pump, a cavitation discrimination condition indicating that the cavitation margin of the in-tank pump exceeds a set margin threshold, and a power discrimination condition indicating that the power of the submersible pump is lower than a set power threshold.

[0038] Loading demand can indicate loading density and loading time, and the loading demand flow can be obtained based on loading density and loading time.

[0039] The loading conditions parameters corresponding to the loading requirements can be the parameters of the underwater pump and the in-tank pump connected in series to achieve loading under the loading demand flow rate. These parameters include, but are not limited to: the ratio of mud density to water density, the friction coefficient, inner diameter, local resistance loss coefficient, pipe length, and in-pipe velocity of the underwater pump pipeline, the friction coefficient, inner diameter, local resistance loss coefficient, pipe length, and in-pipe velocity of the in-tank pump pipeline, the dredging depth of the trailing suction hopper dredger, the height from the center of the underwater pump to the underwater mud surface, the vertical height difference between the underwater pump and the in-tank pump, and the vertical distance from the center of the in-tank pump to the highest point of the sludge discharge pipe.

[0040] The series matching conditions include head discrimination conditions, cavitation discrimination conditions, and power discrimination conditions. The head discrimination condition requires that the total slurry head of the pipeline and the total slurry head of the slurry pump be consistent, both provided by the submersible pump and the in-tank pump connected in series. The cavitation discrimination condition requires that the cavitation margin of the in-tank pump exceeds a set margin threshold. The cavitation margin of the in-tank pump is the difference between the in-tank pump's net positive suction head (NPSH, provided by the pipeline to the in-tank pump's inlet) and the in-tank pump's slurry pump NPSH (i.e., the required NPSH). The set margin threshold is not limited. The power discrimination condition requires that the submersible pump power is lower than a set power threshold. The submersible pump power is the calculated power of the submersible pump. The set power threshold is not limited; for example, it could be 85% of the submersible pump motor power.

[0041] In this step, the total head of the pipeline mud can be determined based on the loading conditions. To meet the head discrimination criteria, the total head of the mud pump is taken to be consistent with the total head of the pipeline mud. Since the total head of the mud pump is related to the total head of the mud pump clear water, the total head of the mud pump clear water that meets the head discrimination criteria can be determined accordingly. Based on the relationship between the speed, flow rate, and clear water head of the submersible pump and the in-tank pump, a set of candidate speed combinations for the submersible pump and the in-tank pump is determined under the loading flow requirement, such that the sum of the clear water head of the corresponding submersible pump and the clear water head of the in-tank pump equals the total head of the mud pump clear water. Based on the speed combination, the cavitation margin of the in-tank pump is determined based on the tank loading condition parameters, and it is judged whether it exceeds the set margin threshold, i.e., whether it meets the cavitation discrimination condition. The submersible pump power is determined based on the tank loading condition parameters, and it is judged whether it is lower than the set power threshold, i.e., whether it meets the power discrimination condition. If the candidate speed combination meets both the cavitation discrimination condition and the power discrimination condition, it is used as the reference speed combination of the submersible pump and the in-tank pump that meets the series matching condition. If it does not meet the condition, the candidate speed combination is re-determined and the condition discrimination is re-performed until a reference speed combination is found.

[0042] S120. Based on the reference speed combination, adjust the speed and, in conjunction with the similarity law of the pump, determine multiple extended speed combinations of the underwater pump and the in-cabin pump that satisfy the series matching conditions.

[0043] The similarity law of pumps describes the conversion relationships between the performance parameters (such as flow rate, head, power, and net positive suction head) of the same pump at different speeds. For example, (Speed ​​2 / Speed ​​1) = (Flow Rate 2 / Flow Rate 1), (Speed ​​2 / Speed ​​1) 2 =(Head 2 / Head 1), (Speed ​​2 / Speed ​​1) 2 =(NPSH 2 / NPSH 1).

[0044] Speed ​​adjustments are made based on a reference speed combination, i.e., changing the speeds of the two pumps. For example, the speed of the submersible pump can be increased while the speed of the internal pump decreases, or vice versa. It should be noted that the increase or decrease can be based on a certain step size, such as 1 rpm; and during the increase or decrease, the speed of one pump can be changed once, while the speed of the other pump can be changed multiple times, each change resulting in a new adjusted speed combination. Optionally, speed adjustments based on the reference speed combination include: adjusting the speeds of the submersible pump and the internal pump in opposite directions based on the reference speed combination.

[0045] For each combination of adjusted speeds obtained from the speed adjustment, the following series matching condition verification is performed:

[0046] Regarding the head discrimination criteria: Based on the pump similarity law, the performance parameters of the adjusted speed combination and the reference speed combination are converted. Under the adjusted speed combination and the above-mentioned tank loading flow rate, it is determined whether the total mud head of the pipeline is consistent with the total mud head of the mud pump, and whether the total mud head of the mud pump is the sum of the clear water head of the underwater pump and the clear water head of the tank pump corresponding to the adjusted speed combination. If it is true, the head discrimination criteria are met, and other criteria are further discriminated; if it is not true, the adjusted speed combination is directly discarded, and the next adjusted speed combination is judged.

[0047] Regarding cavitation discrimination criteria: For the adjusted speed combination that meets the head discrimination criteria, the performance parameters of the adjusted speed combination and the reference speed combination are converted according to the pump similarity law. Under this adjusted speed combination and the aforementioned tank loading demand flow rate, it is determined whether the cavitation margin of the pump in the tank exceeds the set margin threshold. If so, the cavitation discrimination criteria are met. Regarding power discrimination criteria: For the adjusted speed combination that meets the head discrimination criteria, the performance parameters of the adjusted speed combination and the reference speed combination are converted according to the pump similarity law. Under this adjusted speed combination and the aforementioned tank loading demand flow rate, it is determined whether the submersible pump power is lower than the set power threshold. If so, the power discrimination criteria are met.

[0048] Based on the reference speed combination, the speed is continuously adjusted, and the series matching condition is checked during each speed adjustment. All power combinations that meet the three conditions included in the series matching condition are determined as the extended speed combination of the submersible pump and the in-chamber pump.

[0049] S130. Combining the reference speed combination and the extended speed combination, the linear matching relationship of the speed of the underwater pump and the in-cabin pump in series and the speed adjustment range are obtained by fitting.

[0050] Based on a defined baseline speed combination and multiple extended speed combinations, a linear matching relationship for the speeds of the submersible pump and the in-tank pump can be obtained by using the submersible pump speed as the independent variable and the in-tank pump speed as the dependent variable, based on the baseline speed combination and multiple extended speed combinations. Furthermore, this linear matching relationship is limited by the speed adjustment range, and its representation is a linear line segment. The beginning and end of this line segment reflect the speed adjustment range, namely, the range from the minimum to the maximum speed of the submersible pump and the range from the minimum to the maximum speed of the in-tank pump.

[0051] The technical solution of this invention determines a set of reference speed combinations for submersible pumps and in-tank pumps that meet the series matching conditions based on the tank loading operating parameters corresponding to the tank loading requirements. The series matching conditions include a head discrimination condition indicating that the total mud head of the pipeline is consistent with the total mud head of the mud pump, a cavitation discrimination condition indicating that the cavitation margin of the in-tank pump exceeds a set margin threshold, and a power discrimination condition indicating that the power of the submersible pump is lower than a set power threshold. Based on the reference speed combinations, speed adjustments are made, and multiple extended speed combinations for submersible pumps and in-tank pumps that meet the series matching conditions are determined by combining the reference speed combinations and the extended speed combinations. Finally, a linear matching relationship and speed adjustment range for the series connection of the submersible pumps and in-tank pumps are obtained by fitting the series speed combinations. This solution addresses the technical challenges of cavitation risk of the dredging pump and power limitation of the submersible pump when the submersible pump and the dredging pump are connected in series under dredging conditions at depths of 100 meters. It conducts speed matching analysis on the two pumps connected in series for dredging, obtains a reasonable speed range and speed regulation relationship between the two pumps, and uses it to guide the speed adjustment of the mud pump during dredging construction, improve the efficiency of dredging in series at depths of 100 meters, and ensure the stable and safe operation of the dredging system.

[0052] Example 2

[0053] Figure 2 This is a flowchart of a two-pump series matching method for a trailing suction hopper dredger according to Embodiment 2 of the present invention. This embodiment is a further refinement of Embodiment 1 above, which determines a set of reference speed combinations of underwater pumps and tank pumps that meet the series matching conditions based on the tank loading operating parameters corresponding to the tank loading requirements. Figure 2 As shown, the method includes:

[0054] S111. Based on the loading conditions parameters corresponding to the loading requirements, the total clean water head of the mud pump that meets the head discrimination conditions is determined using the pipeline mud head calculation formula and the mud pump mud head calculation formula.

[0055] In this step, the total head of the pipeline mud can be determined based on the loading conditions parameters using the pipeline mud head calculation formula. To meet the head discrimination condition, the total head of the mud pump mud is taken to be consistent with the total head of the pipeline mud. Then, the total head of the mud pump clear water is determined using the mud pump mud head calculation formula.

[0056] In one embodiment, based on the loading conditions parameters corresponding to the loading requirements, the total head of the mud pump that meets the head discrimination condition is determined using the pipeline mud head calculation formula and the mud pump mud head calculation formula. This includes: determining the total head of the pipeline mud based on the loading conditions parameters corresponding to the loading requirements using the pipeline mud head calculation formula; ensuring that the total head of the mud pump is consistent with the total head of the pipeline mud; and determining the total head of the mud pump that meets the head discrimination condition using the mud pump mud head calculation formula.

[0057] The formula for calculating pipeline mud head is as follows:

[0058] ;

[0059] Figure 3 This is a schematic diagram of two pumps connected in series on a trailing suction hopper dredger according to Embodiment 2 of the present invention, combined with... Figure 3 The parameters in the formula for calculating pipeline mud head are explained as follows: The total head of the pipeline mud is in meters (m), which is equivalent to mH2O. Meters of water column are simplified to meters. 1.15 is the soil quality correlation coefficient, which can be determined based on the actual application. The specific gravity of the mud is the ratio of the density of the mud to the density of the water. This refers to the pipe length corresponding to the underwater pump's related pipelines. The length of the pipes related to the pumps inside the compartment is in meters (m). and They are respectively Duan He Friction coefficient of the corresponding piping system; and They are respectively Duan He The inner diameter of the corresponding piping system, in meters (m); 0.12 and 2.85 are respectively Duan He The local resistance loss coefficient of the corresponding piping system components can be determined according to the actual application; and They are respectively Duan He The velocity inside the corresponding piping system, in m / s; The acceleration due to gravity is taken as 9.8 m / s². 2 ; The dredging depth of a trailing suction hopper dredger is expressed in meters (m). The height from the center of the underwater pump to the underwater mud surface, in meters; The vertical height difference between the center of the underwater pump and the center of the pump inside the tank, in meters; From the center of the in-chamber pump to the sludge discharge pipe (i.e. The vertical distance from the highest point, in meters.

[0060] The formula for calculating the mud pump head is as follows:

[0061] ;

[0062] in, The total head of the mud pump is in meters (m), which is equivalent to mH2O. The total head of the mud pump for clean water is expressed in meters (m), which is equivalent to mH2O. This is the soil type conversion factor for mud lift, such as 0.5 for fine sand; This refers to the specific gravity of the mud.

[0063] The total pipeline mud head can be determined by substituting the loading conditions into the pipeline mud head calculation formula. This increases the total head of the mud pump. Total head of pipeline mud The total head of the mud pump for clear water can be determined by combining the mud pump slurry head calculation formula with the formula. .

[0064] S112. Using the sum of the clean water head of the submersible pump and the clean water head of the in-tank pump as the benchmark for the total clean water head of the mud pump, the candidate speed combination of the submersible pump and the in-tank pump is determined by using the pump characteristic curve.

[0065] When two pumps are connected in series, both pumps have the same flow rate, and the total head of the mud pump for clear water is... To improve the clean water head of the submersible pump and the head of the in-cabin pump for clean water The sum of .

[0066] Pump characteristic curves can be curves related to pump characteristics, and can include multiple curves, such as flow rate-clean water head curves, etc., without limitation here.

[0067] Different flow rate-clear water head curves correspond to different speeds. Based on this, by using the flow rate-clear water head curves corresponding to different speeds of the submersible pump and the flow rate-clear water head curves corresponding to different speeds of the in-tank pump, a set of speed combinations is determined under the required flow rate for loading into the tank, where the sum of the clear water head of the submersible pump and the clear water head of the in-tank pump is equal to the total clear water head of the mud pump. The determined speed combinations are then used as candidate speed combinations.

[0068] S113. Under the candidate speed combination, determine whether the cavitation discrimination condition is met by using the device net positive suction head (NPSH) calculation formula and the pump characteristic curve.

[0069] In this step, based on the candidate speed combination and the loading condition parameters, the net positive suction head (NPSH) of the pumps in the tank can be determined using the formula for calculating the NPSH of the equipment; the NPSH of the mud pumps in the tank can be determined using the pump characteristic curve; and the cavitation discrimination conditions can be judged based on the NPSH of the pumps in the tank and the NPSH of the mud pumps.

[0070] In one embodiment, determining whether the cavitation discrimination condition is met using the device NPSH calculation formula and the pump characteristic curve includes: determining the device NPSH of the tank pump using the device NPSH calculation formulas corresponding to the submersible pump and the tank pump respectively; determining the mud pump NPSH of the tank pump based on the tank pump flow-NPSH curve included in the pump characteristic curve; and determining whether the device NPSH of the tank pump and the tank pump NPSH indicating the tank pump NPSH margin exceed a set margin threshold.

[0071] The formula for calculating the net positive suction head (NPSH) of a submersible pump is as follows:

[0072] ;

[0073] Where 10 represents atmospheric pressure, in meters (m), i.e., mH2O; The net positive suction head (NPSH) for the submersible pump is expressed in meters (m); 0.8 represents the NPSH value used in calculating the device. The local resistance loss coefficient.

[0074] The formula for calculating the net positive suction head (NPSH) of the in-chamber pump is as follows:

[0075] ;

[0076] in, Net positive suction head (NPSH) for the in-chamber pumps, in meters (m). The value represents the submersible pump head, in meters (m); 0.97 is the net positive suction head (NPSH) used in the calculation. The local resistance loss coefficient.

[0077] That is, based on the loading conditions and the underwater pump's net positive suction head (NPSH) calculation formula, it is obtained. And then according to The net positive suction head (NPSH) of the in-cabin pump is calculated using the formula. .

[0078] Based on the in-tank pump flow rate-NPSH curve corresponding to the in-tank pump speed under the candidate speed combination, the mud pump NPSH under the loading demand flow rate in the curve is determined and used as the mud pump NPSH of the in-tank pump. .

[0079] The net positive suction head (NPSH) of the in-chamber pump system With mud pump NPSH The difference is determined as the cavitation margin of the in-chamber pump, and it is used to determine whether the cavitation margin of the in-chamber pump exceeds the set margin threshold, such as 1.5.

[0080] Optionally, you can also use "OK". Similarly, based on the submersible pump flow rate-NPSH curve corresponding to the submersible pump speed under the candidate speed combination, the NPSH of the submersible pump is determined. ; The net positive suction head (NPSH) of the underwater pump unit Net Positive Suction Head (NPSH) of Submersible Pumps and Mud Pumps The difference is determined as the cavitation margin of the submersible pump, and it is used to determine whether the cavitation margin of the submersible pump exceeds the set margin threshold, such as 1.5. Since the cavitation margin of the submersible pump usually exceeds the set margin threshold, this judgment can be ignored.

[0081] S114. Under the candidate speed combination, use the underwater pump power calculation formula and the pump characteristic curve to determine whether the power discrimination condition is met.

[0082] In this step, based on the candidate speed combination, the efficiency of the underwater pump can be determined by the pump characteristic curve, and the power of the underwater pump can be further determined by the underwater pump power calculation formula, thereby realizing the judgment of the power discrimination condition.

[0083] In one embodiment, determining whether the power discrimination condition is met using the underwater pump power calculation formula and the pump characteristic curve includes: determining the underwater pump efficiency based on the underwater pump efficiency curve included in the pump characteristic curve; and determining whether the underwater pump power is lower than a set power threshold using the underwater pump power calculation formula and the underwater pump efficiency.

[0084] The formula for calculating the power of an underwater pump is as follows:

[0085] ;

[0086] in, This refers to the power of the underwater pump. To meet the demand for cargo loading; The efficiency of the submersible pump is determined by the flow rate-submersible pump efficiency curve under the candidate speed combination, or by the flow rate-submersible pump efficiency curve and the flow rate-in-tank pump efficiency curve under the candidate speed combination (to comprehensively determine the high efficiency zone of the two pumps).

[0087] Determine if the underwater pump power is lower than the set power threshold, such as if it is lower than 85% of the underwater pump motor power.

[0088] S115. The candidate speed combination that simultaneously satisfies the cavitation discrimination condition and the power discrimination condition is determined as the reference speed combination.

[0089] If the candidate speed combination satisfies both the cavitation discrimination condition and the power discrimination condition, it is used as the reference speed combination for the submersible pump and the in-chamber pump that meet the series matching condition. If it does not meet the condition, the candidate speed combination is re-determined and the condition discrimination is re-performed until a reference speed combination is found.

[0090] S120. Based on the reference speed combination, adjust the speed and, in conjunction with the similarity law of the pump, determine multiple extended speed combinations of the underwater pump and the in-cabin pump that satisfy the series matching conditions.

[0091] S130. Combining the reference speed combination and the extended speed combination, the linear matching relationship of the speed of the underwater pump and the in-cabin pump in series and the speed adjustment range are obtained by fitting.

[0092] The following is an illustrative example of the above content:

[0093] Taking a certain trailing suction hopper dredger as an example, the dredged density of the vessel is 1.25 t / m³. 3 With a loading time of 220 minutes, the required flow rate is calculated to be 27,500 m³ / s. 3 / h; combined Figure 3 , , , and The m lengths are 120m, 85m, 26m, and 46m respectively. and They are 1.3m and 1.2m respectively. and They are 0.075 and 0.092 respectively. and The speeds are 5.76 m / s and 6.76 m / s respectively. , and The depths are 105m, 70m, and 90m respectively, and the underwater pump motor power is 4710kW.

[0094] Substituting the above loading conditions into the pipeline mud head calculation formula, we obtain the total pipeline mud head. The total head of the mud pump is 57m. Also 57m, combined with the mud pump slurry head calculation formula, the total head of the mud pump for clear water is determined. The value is 51m; read from the flow-clear water head curve, at a flow rate of 27500m³ / h. 3 / h, Head of the submersible pump at 205 rpm The head is 31m, and the pump speed inside the tank is 154 rpm. The depth is 20m, which satisfies the condition 31+20=51m. Therefore, the underwater pump speed of 205rpm and the in-chamber pump speed of 154rpm are considered as a candidate speed combination. Figure 4 This is a schematic diagram of a flow rate-clean water head curve provided in Embodiment 2 of the present invention, which includes the correspondence between flow rate and clean water head under the candidate speed combination.

[0095] Under this candidate speed combination, the net positive suction head (NPSH) of the submersible pump is calculated using the formula for calculating the net positive suction head (NPSH). The value is 20m. Substituting this into the formula for calculating the net positive suction head (NPSH) of the in-chamber pump, we obtain... It is 7.4m; read from the flow-NPSH curve, at a flow rate of 27500m³ / h 3 / h time, It is 6.0m. If it is 5.0m, then and The difference and and The differences all exceeded 1.5m, indicating that the candidate speed combination met the cavitation discrimination condition. Figure 5 This is a schematic diagram of the flow rate-NPSH curve of an underwater pump according to Embodiment 2 of the present invention, which includes the relationship between the flow rate and the NPSH of the pipeline device and the required NPSH of the mud pump under the candidate speed combination. Figure 6 This is a schematic diagram of the flow rate-NPSH curve of an in-chamber pump according to Embodiment 2 of the present invention, which includes the relationship between the flow rate and the NPSH of the pipeline equipment and the required NPSH of the mud pump under the candidate speed combination.

[0096] Under this candidate speed combination, based on the efficiency curves of the submersible pump and the in-cabin pump, the efficiency of the submersible pump is read as 86%. Substituting this into the submersible pump power calculation formula, the power of the submersible pump is determined to be 3219 kW, which is lower than the 85% power of the submersible pump motor. Therefore, this candidate speed combination is determined to meet the power discrimination condition. Figure 7 This is a schematic diagram of the efficiency curves of an underwater pump and an in-cabin pump according to Embodiment 2 of the present invention, which includes the relationship between the flow rate and the efficiency of the underwater pump and the efficiency of the in-cabin pump under the candidate speed combination.

[0097] The candidate speed combination is then set as the base speed combination, with the underwater pump speed at 205 rpm and the in-chamber pump speed at 154 rpm.

[0098] The speeds of the two pumps in the baseline speed combination are adjusted, such as increasing the submersible pump speed and decreasing the tank pump speed, or vice versa. Each adjustment is treated as an adjustment speed combination. After conversion according to the pump similarity law, a series matching condition check is performed under the tank loading demand flow rate. All adjustment speed combinations that meet the series matching condition are determined as extended speed combinations. It should be noted that if the cavitation discrimination condition is not met, the submersible pump speed is increased while the tank pump speed is decreased, so that the flow rate point remains unchanged, and the discrimination is performed again. If the power discrimination condition is not met, the submersible pump speed is decreased while the tank pump speed is increased, so that the flow rate point remains unchanged, and the discrimination is performed again.

[0099] Table 1 is an example table of reference speed combinations and extended speed combinations. As shown in Table 1, number 5 corresponds to the reference speed combination, and the other numbers correspond to extended speed combinations.

[0100]

[0101] For example, the conversion of the clean water head from the reference speed combination of sequence 5 to the extended speed combination of sequence 1 is as follows: (Known) Figure 4The diagram shows the water flow rate and head curves for a submersible pump speed of 205 rpm and an in-tank pump speed of 154 rpm. Based on these known curves, several data points for flow rate and head are selected from the known curves using the flow rate conversion relationship (flow rate is proportional to speed) and the head conversion relationship (head is proportional to the square of speed). The corresponding data points for the submersible pump speed of 223 rpm and the in-tank pump speed of 130 rpm are then calculated. These new data points are fitted to obtain the water flow rate and head curves for the submersible pump speed of 223 rpm and the in-tank pump speed of 130 rpm, respectively. The water head of each pump under the required in-tank flow rate can then be read from the newly fitted curves. Figure 8 This is a schematic diagram of another flow rate-clean water head curve provided in Embodiment 2 of the present invention. Figure 8 It can be seen that the underwater pump speed of 223 rpm is at 27500 m 3 The clean water head at / h is 38.6, and the pump speed inside the tank is 130 rpm at 27500 m. 3 The head of the clean water at / h is 12.4.

[0102] By using a method similar to the above-mentioned clear water head conversion method, the required parameters for each extended speed combination in Table 1 can be calculated to achieve series matching condition verification.

[0103] By combining the above-mentioned reference speed and extended speed combinations, the linear matching relationship of the speed of the submersible pump and the in-chamber pump in series and the speed adjustment range are obtained through fitting.

[0104] Figure 9 This is a schematic diagram of a linear speed matching relationship provided in Embodiment 2 of the present invention, as shown below. Figure 9 As shown, the flow rate is 27500 m³. 3 At a speed of [number] / h, the submersible pump speed adjustment range is 203-223 rpm, and the corresponding in-tank pump speed adjustment range is 156-130 rpm. This ensures a certain speed range for the mud pump to adapt to fluctuations in concentration, flow rate, and other operating conditions. Furthermore, the speeds of the two pumps are linearly correlated, and the linear matching relationship can be expressed as n2 = -1.3022n1 + 421, where n1 is the submersible pump speed and n2 is the in-tank pump speed. That is, when the submersible pump speed is adjusted, the in-tank pump speed must also be adjusted accordingly. The linear relationship between the two pump speeds can be used to guide the mud pump speed adjustment during construction to ensure safe and stable operation under series loading conditions.

[0105] Example 3

[0106] Figure 10 This is a schematic diagram of a two-pump series matching device for a trailing suction hopper dredger according to Embodiment 3 of the present invention. This embodiment is applicable to situations where underwater pumps and in-tank pumps are connected in series for matching of tandem operating conditions, such as... Figure 10 As shown, the specific structure of the device includes:

[0107] The first determining module 101 is used to determine a set of reference speed combinations of submersible pumps and in-tank pumps that meet the series matching conditions based on the tank loading conditions parameters corresponding to the tank loading requirements; wherein, the series matching conditions include a head discrimination condition indicating that the total mud head of the pipeline is consistent with the total mud head of the mud pump, a cavitation discrimination condition indicating that the cavitation margin of the in-tank pump exceeds a set margin threshold, and a power discrimination condition indicating that the power of the submersible pump is lower than a set power threshold.

[0108] The second determining module 102 is used to adjust the speed based on the reference speed combination, and determine multiple extended speed combinations of underwater pumps and in-cabin pumps that meet the series matching conditions by combining the similarity law of pumps.

[0109] The fitting module 103 is used to combine the reference speed combination and the extended speed combination to fit the linear matching relationship of the speed of the underwater pump and the in-cabin pump in series and the speed adjustment range.

[0110] The trailing suction hopper dredger two-pump series matching device provided in this embodiment determines a set of reference speed combinations of underwater pumps and tank pumps that meet the series matching conditions based on the tank loading conditions parameters corresponding to the tank loading requirements through a first determining module. The series matching conditions include a head discrimination condition indicating that the total mud head of the pipeline is consistent with the total mud head of the mud pump, a cavitation discrimination condition indicating that the cavitation margin of the tank pump exceeds a set margin threshold, and a power discrimination condition indicating that the power of the underwater pump is lower than a set power threshold. A second determining module adjusts the speed based on the reference speed combinations and, combined with the pump similarity law, determines multiple extended speed combinations of underwater pumps and tank pumps that meet the series matching conditions. A fitting module combines the reference speed combinations and the extended speed combinations to obtain the linear matching relationship and speed adjustment range of the underwater pumps and tank pumps connected in series. This solution addresses the technical challenges of cavitation risk of the dredging pump and power limitation of the submersible pump when the submersible pump and the dredging pump are connected in series under dredging conditions at depths of 100 meters. It conducts speed matching analysis on the two pumps connected in series for dredging, obtains a reasonable speed range and speed regulation relationship between the two pumps, and uses it to guide the speed adjustment of the mud pump during dredging construction, improve the efficiency of dredging in series at depths of 100 meters, and ensure the stable and safe operation of the dredging system.

[0111] Furthermore, the first determining module 101 is specifically used for:

[0112] Based on the loading conditions parameters corresponding to the loading requirements, the total clean water head of the mud pump that meets the head discrimination conditions is determined by using the pipeline mud head calculation formula and the mud pump mud head calculation formula.

[0113] Using the sum of the clean water head of the submersible pump and the clean water head of the in-tank pump as the benchmark for the total clean water head of the mud pump, the candidate speed combination of the submersible pump and the in-tank pump is determined by using the pump characteristic curve.

[0114] Under the candidate speed combination, the cavitation margin calculation formula of the device and the pump characteristic curve are used to determine whether the cavitation discrimination condition is met.

[0115] Under the candidate speed combination, the underwater pump power calculation formula and the pump characteristic curve are used to determine whether the power discrimination condition is met.

[0116] The candidate speed combination that simultaneously satisfies the cavitation discrimination condition and the power discrimination condition is determined as the reference speed combination.

[0117] Furthermore, the first determining module 101 is specifically used for:

[0118] Based on the loading conditions parameters corresponding to the loading requirements, the total pipeline mud head is determined using the pipeline mud head calculation formula.

[0119] Make the total mud pump head consistent with the total mud pump head of the pipeline, and use the mud pump head calculation formula to determine the total clean water head of the mud pump that meets the head discrimination condition.

[0120] Furthermore, the first determining module 101 is specifically used for:

[0121] The net positive suction head (NPSH) of the in-chamber pump is determined using the respective formulas for calculating the NPSH of the submersible pump and the in-chamber pump.

[0122] Based on the in-tank pump flow rate-NPSH curve included in the pump characteristic curve, the mud pump NPSH of the in-tank pump is determined.

[0123] Determine whether the net positive suction head (NPSH) of the in-tank pump and the NPSH of the mud pump, as indicated by the in-tank pump, exceed the set allowance threshold.

[0124] Furthermore, the first determining module 101 is specifically used for:

[0125] The efficiency of the underwater pump is determined based on the underwater pump efficiency curve included in the pump characteristic curve.

[0126] The underwater pump power calculation formula is used, combined with the underwater pump efficiency, to determine whether the underwater pump power is lower than the set power threshold.

[0127] Furthermore, the second determining module 102 is specifically used for:

[0128] Based on the aforementioned reference speed combination, the speeds of the underwater pump and the in-cabin pump are adjusted in opposite directions.

[0129] The trailing suction hopper tandem matching device provided in this embodiment of the invention can execute the trailing suction hopper tandem matching method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the method.

[0130] Example 4

[0131] Figure 11 This is a schematic diagram of the structure of an electronic device implementing embodiments of the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (such as helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0132] like Figure 11 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 performs various appropriate actions and processes based on the computer programs stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 may also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0133] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0134] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as the two-pump series matching method on a trailing suction hopper dredger.

[0135] In some embodiments, the trailing suction hopper tandem pump matching method can be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the trailing suction hopper tandem pump matching method described above can be performed. Alternatively, in other embodiments, processor 11 can be configured to perform the trailing suction hopper tandem pump matching method by any other suitable means (e.g., by means of firmware).

[0136] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0137] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0138] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0139] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0140] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or middleware components (e.g., application servers), or frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0141] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through a communication network. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0142] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0143] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for matching two pumps in series on a trailing suction hopper dredger, characterized in that, include: Based on the loading conditions parameters corresponding to the loading requirements, a set of reference speed combinations of submersible pumps and in-tank pumps that meet the series matching conditions are determined; wherein, the series matching conditions include the head discrimination condition indicating that the total mud head of the pipeline is consistent with the total mud head of the mud pump, the cavitation discrimination condition indicating that the cavitation margin of the in-tank pump exceeds the set margin threshold, and the power discrimination condition indicating that the power of the submersible pump is lower than the set power threshold. Based on the aforementioned reference speed combination, speed adjustments are made, and combined with the pump similarity law, multiple extended speed combinations of underwater pumps and in-cabin pumps that satisfy the aforementioned series matching conditions are determined. By combining the reference speed combination and the extended speed combination, the linear matching relationship of the speed of the underwater pump and the in-cabin pump in series and the speed adjustment range are obtained by fitting.

2. The method according to claim 1, characterized in that, Based on the loading conditions parameters corresponding to the loading requirements, a set of reference speed combinations for submersible pumps and in-tank pumps that meet the series matching conditions is determined, including: Based on the loading conditions parameters corresponding to the loading requirements, the total clean water head of the mud pump that meets the head discrimination conditions is determined by using the pipeline mud head calculation formula and the mud pump mud head calculation formula. Using the sum of the clean water head of the submersible pump and the clean water head of the in-tank pump as the benchmark for the total clean water head of the mud pump, the candidate speed combination of the submersible pump and the in-tank pump is determined by using the pump characteristic curve. Under the candidate speed combination, the cavitation margin calculation formula of the device and the pump characteristic curve are used to determine whether the cavitation discrimination condition is met. Under the candidate speed combination, the underwater pump power calculation formula and the pump characteristic curve are used to determine whether the power discrimination condition is met. The candidate speed combination that simultaneously satisfies the cavitation discrimination condition and the power discrimination condition is determined as the reference speed combination.

3. The method according to claim 2, characterized in that, Based on the loading conditions parameters corresponding to the loading requirements, and using the pipeline mud head calculation formula and the mud pump mud head calculation formula, the total clean water head of the mud pump that meets the aforementioned head discrimination conditions is determined, including: Based on the loading conditions parameters corresponding to the loading requirements, the total pipeline mud head is determined using the pipeline mud head calculation formula. Make the total mud pump head consistent with the total mud pump head of the pipeline, and use the mud pump head calculation formula to determine the total clean water head of the mud pump that meets the head discrimination condition.

4. The method according to claim 2, characterized in that, The determination of whether the cavitation discrimination condition is met is made using the device's net positive suction head (NPSH) calculation formula and the pump characteristic curve, including: The net positive suction head (NPSH) of the in-chamber pump is determined using the respective formulas for calculating the NPSH of the submersible pump and the in-chamber pump. Based on the in-tank pump flow rate-NPSH curve included in the pump characteristic curve, the mud pump NPSH of the in-tank pump is determined. Determine whether the net positive suction head (NPSH) of the in-tank pump and the NPSH of the mud pump, as indicated by the in-tank pump, exceed the set allowance threshold.

5. The method according to claim 2, characterized in that, The determination of whether the power discrimination condition is met is made using the underwater pump power calculation formula and the pump characteristic curve, including: The efficiency of the underwater pump is determined based on the underwater pump efficiency curve included in the pump characteristic curve. The underwater pump power calculation formula is used, combined with the underwater pump efficiency, to determine whether the underwater pump power is lower than the set power threshold.

6. The method according to claim 1, characterized in that, Adjusting the speed based on the aforementioned reference speed combination includes: Based on the aforementioned reference speed combination, the speeds of the underwater pump and the in-cabin pump are adjusted in opposite directions.

7. A series matching device for two pumps on a trailing suction hopper dredger, characterized in that, include: The first determining module is used to determine a set of reference speed combinations of submersible pumps and in-tank pumps that meet the series matching conditions based on the tank loading conditions parameters corresponding to the tank loading requirements. The series matching conditions include a head discrimination condition indicating that the total mud head of the pipeline is consistent with the total mud head of the mud pump, a cavitation discrimination condition indicating that the cavitation margin of the in-tank pump exceeds a set margin threshold, and a power discrimination condition indicating that the power of the submersible pump is lower than a set power threshold. The second determining module is used to adjust the speed based on the reference speed combination, and determine multiple extended speed combinations of underwater pumps and in-cabin pumps that meet the series matching conditions by combining the similarity law of pumps. The fitting module is used to combine the reference speed combination and the extended speed combination to fit the linear matching relationship of the speed of the submersible pump and the in-chamber pump in series and the speed adjustment range.

8. An electronic device, characterized in that, include: At least one processor; as well as A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor to enable the at least one processor to perform the method as described in any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause a processor to execute the method as described in any one of claims 1-6.

10. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the method as described in any one of claims 1-6.

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