CN112446159A - Seawater vane pump state identification method based on parameter measurement method - Google Patents
Seawater vane pump state identification method based on parameter measurement method Download PDFInfo
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Abstract
The invention relates to a seawater vane pump state identification method based on a parameter measurement method, which belongs to the technical field of hydraulic system state identification, and aims at a vane type seawater pump, whether a power element can normally operate or not is detected by using a detection loop of the parameter measurement method in a hydraulic system, and the two most important parameters are pressure and flow; the method comprises the steps of firstly, deducing theoretical flow and theoretical pressure of the seawater vane pump through a large number of experiments, empirical calculation and conversion, and then designing a detection loop by using a parameter measurement method to measure the flow efficiency and actual pressure value of the vane type seawater pump under different flows. Has the characteristics of simple structure, convenient operation, small abrasion and long service life. And the problem of difficult state identification of the operation condition of the seawater vane pump is solved by combining a cosine similarity algorithm. And an algorithm for theoretical values of the seawater vane pump in a parameter measurement method is perfected.
Description
Technical Field
The invention relates to the technical field of hydraulic state identification, in particular to a seawater vane pump state identification method based on a parameter measurement method.
Background
Due to the defects of the vane pump that oil is used as a working medium, such as a closed system, environmental pollution, poor military confidentiality and the like, the hydraulic system using seawater as the working medium is more and more widely used at present, and is the development direction in the future. In addition, the common double-acting positive displacement pump has more sliding friction pairs and large abrasion.
Disclosure of Invention
The invention mainly solves the defects of more sliding friction pairs, large abrasion and short service life in the prior art, and provides a seawater vane pump state identification method based on a parameter measurement method, which has the characteristics of simple structure, convenience in operation, small abrasion and long service life. And the problem of difficult state identification of the operation condition of the seawater vane pump is solved by combining a cosine similarity algorithm. And an algorithm for theoretical values of the seawater vane pump in a parameter measurement method is perfected.
The technical problem of the invention is mainly solved by the following technical scheme:
a seawater vane pump state identification method based on a parameter measurement method is characterized in that a detection loop of the parameter measurement method is utilized for a vane type seawater pump, whether a power element can normally operate or not is determined in a hydraulic system, and the two most important parameters are pressure and flow; the method comprises the steps of firstly, deducing theoretical flow and theoretical pressure of the seawater vane pump through a large number of experiments, empirical calculation and transformation, and then designing a detection loop by using a parameter measurement method to measure the flow efficiency and actual pressure value of the vane type seawater pump under different flows.
The method specifically comprises the following operation steps:
the first step is as follows: obtaining a formula of theoretical discharge capacity Q of the seawater vane pump rotating for one circle by using a geometric volume method:
the parameters involved are: the radius r of a small semi-circular arc in the stator, the radius Ro of the rotor and the length L of the blade, wherein B is the thickness of the stator; and calculating to obtain the theoretical discharge value Q of the blade type sea water pump.
The second step is that: and obtaining values of all supporting reaction forces which can be borne by the blades at two extreme positions, namely the large and small arc sections of the stator inner line, and respectively obtaining the seawater theoretical pressure F1 borne by the blades at the large and small arc sections of the stator inner line by using a vector analysis method.
The third step: f1 has two values, the smaller one is selected to ensure that the blade is not damaged in the periodic rotation process, so that the limit value measured by the theoretical pressure F1 of the seawater on the blade is obtained, and the smaller one is selected to obtain the pressure value Pr of the seawater pump drainage outlet through conversion, namely the theoretical pressure limit value of the seawater pump drainage outlet.
The fourth step: the actual pressure and flow of the seawater vane pump are communicated with the control valve and the water outlet pipe through a system loop pipe by adopting a T-shaped joint, the detection loop is communicated with the water outlet pipe in parallel, and meanwhile, the detection loop and the water outlet pipe are communicated with the seawater vane pump through a water inlet pipe.
The fifth step: through the opening and closing control of a control valve, a loading valve, a reversing valve, a pressure regulating valve and a safety valve in a detection loop, the actual flow and the seawater pressure Pr' of the seawater vane pump are measured by a flow meter and a pressure gauge in the detection loop, and efficiency and flow, pressure and flow characteristic curves are drawn; and comparing the actual value with the theoretical value through the characteristic curves of efficiency and flow as well as pressure and flow, and continuously judging the running condition of the seawater vane pump.
And a sixth step: and if the actual value is not in the range of the reasonable operation interval specified by the proposed judgment standard, the operation state of the seawater pump is not good, and the integration and correction are carried out to realize that the seawater vane pump works in the reasonable operation interval.
Preferably, when the blade is positioned in a small arc segment, the blade is in a stage of water discharge and water suction turning area, and the tip of the blade is also subjected to a support reaction force N1，N1Is N2And N3A function of (a); at this time, except for the support reaction force N1、N2、N3In addition, the blades are subjected to seawater pressure F1Centrifugal force FCFrictional force F2(ii) a When the blade is positioned at the large arc section, the blade is in the stage of water absorption and turning to the drainage area, and the top end of the blade is stressed by N1With friction force F2Very small, the force is mainly F1、Fc、N2、N3。
Preferably, when the blades are positioned in the large arc section and the small arc section, the blades are respectively subjected to the support reaction forces N with the same magnitude and opposite directions2And N3In the limit state of large and small circular arcs, the unknown quantity is the seawater pressure F1The sea water pressure F can be obtained by using a vector drawing analysis method1The specific value.
Preferably, according to an empirical formula: p is 1.3PrWherein P is the theoretical seawater pressure to which the blade is subjected, 1.3 is an empirical rule numerical value obtained based on a large number of experiments, PrThe theoretical pressure P at the sea water pump drainage port can be obtained by the theoretical pressure value at the sea water pump drainage portrThe actual value P of the water outlet is directly measured by the detection loopr', then by the formula, F1Converting theoretical pressure P of water outlet by introducing PrThen the theoretical pressure P at the water outlet is adjustedrWith the actual pressure value Pr' comparison.
Preferably, the seawater vane pump comprises 10 vanes to form 10 sealed cavities, and the port plate is provided with 2 water suction areas and 2 water discharge areas; the contact mode of the rotor and the bottom end of the blade is upgraded from the original surface contact sliding friction to the cylindrical hinge rolling friction; the two sides of the blade close to the top end are provided with trunnions, one side of the trunnion is in interference fit with a rolling bearing, and the rolling bearing is placed and fixed in the annular groove, so that the top end of the blade is tightly attached to the inner line of the stator.
Preferably, the sealed volume is formed by the enclosed parts of the inner lines of the two adjacent blades, the rotor and the stator, when the rotor rotates and the blades rotate clockwise, the small arc is transited to the large arc section, the volume of the sealed cavity is increased to form partial vacuum degree, and the water suction port sucks in low-pressure water; an oil sealing area is formed between the two cavities; when the large arc is transited to the small arc section, the volume of the sealed cavity is reduced, and the water outlet discharges high-pressure water.
Preferably, a control valve in the system loop is closed, a pressure regulating valve and a safety valve in the detection loop are opened, a reversing valve is closed, the whole flow of the seawater vane pump flows into the detection loop, a pressure regulating handle of the pressure regulating valve is slowly regulated from low to high, the load of the seawater vane pump is increased, and the actual flow and pressure values of a water outlet of the seawater vane pump are read through a flowmeter and a pressure gauge.
Preferably, the flow and pressure characteristic curve and the flow and efficiency characteristic curve are obtained by firstly looking at the pressure and flow corresponding to the optimal working condition point, and comparing whether the theoretical pressure and the theoretical flow meet the fluctuation range within 1MPa and the efficiency of more than 80 percent; if so, taking the optimal working condition point as an identification standard, and then judging whether the deviation of the actual pressure corresponding to different flows and the pressure of the optimal working condition point is within the range of 1 MPa; if the actual flow rate and the theoretical flow rate are met, the flow rate and efficiency characteristic curve is used for calibration, whether the efficiency corresponding to the actual flow rate corresponding to the actual pressure is higher than 80% or not is judged according to the standard, and if the actual flow rate and the theoretical flow rate are met, the operation state of the point is good.
Preferably, when the reasonable operation interval has deviation, the reasonable operation interval in the flow and pressure characteristic curve and the flow and efficiency characteristic curve needs to be corrected in an integrated manner, and the similarity degree of the two intervals is judged and corrected based on a cosine similarity algorithm; the cosine similarity formula is:
preferably, the intervals of the two characteristic curves are [295, 480] and [300, 473], respectively, and in a two-dimensional coordinate system, the two characteristic curves are expressed in a vector form as: a1 ═ (295, 480), a2 ═ 300, 473; wherein x 1-295, x 2-300, y 1-480, y 2-473; the cosine similarity formula is used for calculating the included angle between the two vectors, and the similarity between the two reasonable operation intervals is 0.9 and is very similar. And correcting by using a vector two-dimensional coordinate graph, taking the middle points (297.5, 476.5) of (295, 480) and (300, 473), and correcting the reasonable operation intervals of the two graphs to obtain the final reasonable operation interval of the flow rate [297.5, 476.5 ].
The invention can achieve the following effects:
compared with the prior art, the seawater vane pump state identification method based on the parameter measurement method has the characteristics of simple structure, convenience in operation, small abrasion and long service life. And the problem of difficult state identification of the operation condition of the seawater vane pump is solved by combining a cosine similarity algorithm. And an algorithm for theoretical values of the seawater vane pump in a parameter measurement method is perfected. And judging the similarity of the two characteristic curve intervals by using a similarity algorithm, and integrating and correcting reasonable operation intervals corresponding to the flow-efficiency characteristic curve and the flow-pressure characteristic curve in the example.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic diagram of the detection circuit of the present invention.
Fig. 3 is a structural sectional view of the seawater vane pump of the present invention.
FIG. 4 is a force analysis plot of a small arc segment of a blade of the present invention.
FIG. 5 is a force analysis plot of the large arc segment of the blade of the present invention.
Fig. 6 is a graph of the flow versus pressure characteristic of the present invention.
Fig. 7 is a graph of the flow versus efficiency characteristic of the present invention.
Fig. 8 is a flow chart of the present invention.
In the figure: the device comprises a control valve 1, a T-shaped joint 2, a water inlet pipe 3, a detection loop 4, a water outlet pipe 5, a loading valve 6, a seawater vane pump 7, a system loop pipe 8, a flowmeter 9, a pressure gauge 10, a reversing valve 11, a pressure regulating valve 12, a safety valve 13, a rolling bearing 14, a water outlet 15, a port plate 16, a water suction port 17, a rotor 18, a stator 19, a cylindrical hinge 20, vanes 21, a stator inner wire 22, a trunnion 23 and an annular groove 24.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b): as shown in fig. 1-8, a method for identifying the state of a seawater vane pump based on a parameter measurement method, which is directed at a vane type seawater pump, utilizes a detection circuit of the parameter measurement method to determine whether a power element can normally operate in a hydraulic system, wherein the two most important parameters are pressure and flow; the method comprises the steps of firstly, deducing theoretical flow and theoretical pressure of the seawater vane pump through a large number of experiments, empirical calculation and transformation, and then designing a detection loop by using a parameter measurement method to measure the flow efficiency and actual pressure value of the vane type seawater pump under different flows.
The method specifically comprises the following operation steps:
the first step is as follows: the theoretical discharge capacity Q of the seawater vane pump 7 rotating for one circle is obtained by a geometric volume method:
the parameters involved are: the stator inner line 22 small radius r, the rotor 18 radius Ro and the length L of the blade 21, B is the stator 19 thickness; and calculating to obtain the theoretical discharge value Q of the blade type sea water pump.
The second step is that: obtaining the values of the supporting reaction forces borne by the blades 21 at the two extreme positions, namely the large and small arc sections of the stator inner line 22, and respectively obtaining the seawater theoretical pressure F borne by the blades 21 at the large and small arc sections of the stator inner line 22 by using a vector analysis method1。
When the blade 21 is located in the small arc section, the blade 21 is in the stage of the water discharge turning water suction area, and the top end of the blade 21 also bears the support reaction force N1，N1Is N2And N3A function of (a); at this time, except for the support reaction force N1、N2、N3In addition, the blades 21 are subjected to seawater pressure F1Centrifugal force FCFrictional force F2(ii) a When the blade 21 is located at the large arc section, the blade 21 is in the stage of water absorption and turning to the drainage area, and at the moment, the top end of the blade 21 is stressed by N1With friction force F2Very small, the force is mainly F1、FC、N2、N3。
When the blades are located in the large and small arc sections, the blades 21 bear the supporting reaction forces N with the same magnitude and opposite directions2And N3In the limit state of large and small circular arcs, unknown quantityAre all seawater pressure F1The sea water pressure F can be obtained by using a vector drawing analysis method1The specific value.
The third step: f1There are two values, the smaller one is taken to ensure that the blades are not damaged in the periodic rotation process, so as to obtain the theoretical pressure F of the seawater on the blades 211The smaller one of the measured limit values is taken and converted to obtain a pressure value P at the drainage port of the sea water pumprNamely the theoretical pressure limit value of the water outlet of the sea water pump.
According to empirical formulas: p is 1.3PrWherein P is the theoretical seawater pressure to which the blade is subjected, 1.3 is an empirical rule numerical value obtained based on a large number of experiments, PrThe theoretical pressure P at the sea water pump drainage port can be obtained by the theoretical pressure value at the sea water pump drainage portrThe actual value P of the water outlet is directly measured by the detection loopr', then by the formula, F1Converting theoretical pressure P of water outlet by introducing PrThen the theoretical pressure P at the water outlet is adjustedrWith the actual pressure value Pr' comparison.
The fourth step: the actual pressure and flow of the seawater vane pump 7 are communicated with the control valve 1 and the water outlet pipe 5 by a T-shaped joint 2 through a system loop pipe 8, the detection loop 4 is communicated with the water outlet pipe 5 in parallel, and meanwhile, the detection loop 4 and the water outlet pipe 5 are communicated with the seawater vane pump 7 through a water inlet pipe 3.
10 blades 21 are arranged in the seawater vane pump 7 to form 10 sealed cavities, and the port plate 16 is provided with 2 water suction areas and 2 water discharge areas; the contact mode of the rotor 18 and the bottom end of the blade 21 is upgraded from the original surface contact sliding friction to the cylindrical hinge 20 rolling friction; trunnions 23 extending from two sides of the top end of the vane 21 are arranged, one side of the trunnion 21 is in interference fit with the rolling bearing 14, and the rolling bearing 14 is placed and fixed in the annular groove 24, so that the top end of the vane 21 is tightly attached to the inner line 22 of the stator. The sealed volume is formed by the enclosed parts of two adjacent blades 21, the rotor 18 and the stator inner line 22, when the rotor 18 rotates and the blades 21 rotate clockwise, the small arc is transited to the large arc section, the volume of the sealed cavity is enlarged to form partial vacuum degree, and the water suction port 17 sucks in low-pressure water; an oil sealing area is formed between the two cavities; when the large arc is transited to the small arc section, the volume of the sealed cavity is reduced, and the water outlet 15 discharges high-pressure water.
The fifth step: through the opening and closing control of the control valve 1, the loading valve 6, the reversing valve 11, the pressure regulating valve 12 and the safety valve 13 in the detection loop 4, the actual flow and the seawater pressure Pr' of the seawater vane pump 7 are measured by the flowmeter 9 and the pressure gauge 10 in the detection loop 4, and efficiency and flow, and pressure and flow characteristic curves are drawn; and comparing the actual value with the theoretical value through the characteristic curves of efficiency and flow as well as pressure and flow, and continuously judging the running condition of the seawater vane pump 7.
And closing the control valve 1 in the system loop, opening a pressure regulating valve 12 and a safety valve 13 in the detection loop, closing the reversing valve 11, enabling the whole flow of the seawater vane pump 7 to flow into the detection loop, slowly regulating a pressure regulating handle of the pressure regulating valve 12 from low to high, increasing the load of the seawater vane pump 7, and reading the actual flow and pressure values of a water outlet of the seawater vane pump 7 through the flowmeter 9 and the pressure gauge 10.
Firstly, looking at the pressure and flow corresponding to the optimal working condition point, and comparing whether the theoretical pressure and the theoretical flow meet the fluctuation range within 1MPa and the efficiency of more than 80 percent or not; if so, taking the optimal working condition point as an identification standard, and then judging whether the deviation of the actual pressure corresponding to different flows and the pressure of the optimal working condition point is within the range of 1 MPa; if the actual flow rate and the theoretical flow rate are met, the flow rate and efficiency characteristic curve is used for calibration, whether the efficiency corresponding to the actual flow rate corresponding to the actual pressure is higher than 80% or not is judged according to the standard, and if the actual flow rate and the theoretical flow rate are met, the operation state of the point is good.
And a sixth step: and if the actual value is not in the range of the reasonable operation interval specified by the proposed judgment standard, the operation state of the seawater pump is not good, and the integration and correction are carried out to realize that the seawater vane pump 7 works in the reasonable operation interval.
When the reasonable operation interval has deviation, the reasonable operation interval in the flow and pressure characteristic curve and the flow and efficiency characteristic curve needs to be corrected in an integrated manner, and the similarity degree of the two intervals is judged and corrected based on a cosine similarity algorithm; cosine similarityThe degree formula is:
the rotation speed of the seawater vane pump 7 is 1000r/min, the ratio of the length of a line segment on a graph to the actual size is utilized through a vector plotting method, and two small arc segments F at limit positions118.6MPa, large arc segment F18.6 MPa. Ensuring that the blade is not damaged, and taking the smaller value of the limit pressure, the theoretical pressure F of the blade1Is 8.6 MPa. Reuse of P ═ 1.3PrConverting to obtain theoretical value P of pressure in water outletr＝6.88MPa.
The structural parameters of the seawater vane pump 7 include: the thickness B of the stator 19 is 40 dm; the radius R of the most semicircular arc of the stator inner wire 22 is 50 dm; the radius r of the small half arc of the stator inner wire 22 is 45 dm; radius R of rotor 18020 dm; the length L of the blade 21 is 30 dm. Rotating for one circle, the theoretical flow of the sea water pump is as follows:
and designing a detection loop to test actual pressure and flow under different flow states. The flow increases, the load increases and the pressure increases. And (3) combining a specific pump, and drawing characteristic curves of the flow-pressure and flow-efficiency of the water outlet through experimentally measured data. The positive displacement rotor pump is suitable for occasions with low rotating speed, the rotating speed is less than 1500r/min, the conveyed liquid has pulses, the average flow is constant, and the suction capacity is good.
Under the condition that the rotating speed is 1000r/min, the flow of the optimal working condition point is 320m3(ii)/h, corresponding to a pressure of 6MPa, judged using the proposed criteria, efficiency of 320/382 × 100%: 83% > 80%; the pressure deviation is 6.88-6, 0.88MPa < 1 MPa. Then the optimal operating point can be used for further analysis.
Taking the flow as 306m3At the time of the reaction, the corresponding pressure is 5.2MPa, and the pressure deviation is 6-5.2, namely 0.8 is less than 1 MPa; the calibration is carried out by utilizing a flow-efficiency curve, and when the pressure of 5.2MPa corresponds to the flow of 306m3H, at this time the efficiency is80.1% > 80%. In this flow state, both pressure and flow efficiency are satisfied, so the flow is 306m3At/h, the pump operation is good.
The reasonable operation intervals of the two characteristic curves are [295, 480] and [300, 473], and are expressed in a vector form in a two-dimensional coordinate system as follows: a1 ═ (295, 480), a2 ═ 300, 473; wherein x 1-295, x 2-300, y 1-480, y 2-473; the cosine similarity formula is used for calculating the included angle between the two vectors, and the similarity between the two reasonable operation intervals is 0.9 and is very similar. And correcting by using a vector two-dimensional coordinate graph, taking the middle points (297.5, 476.5) of (295, 480) and (300, 473), and correcting the reasonable operation intervals of the two graphs to obtain the final reasonable operation interval of the flow rate [297.5, 476.5 ].
In conclusion, the seawater vane pump state identification method based on the parameter measurement method has the characteristics of simple structure, convenience in operation, small abrasion and long service life. And the problem of difficult state identification of the operation condition of the seawater vane pump is solved by combining a cosine similarity algorithm. And an algorithm for theoretical values of the seawater vane pump in a parameter measurement method is perfected.
The above description is only an embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any changes or modifications within the scope of the present invention by those skilled in the art are covered by the present invention.
Claims (10)
1. A seawater vane pump state identification method based on a parameter measurement method is characterized in that: aiming at a blade type sea water pump, a detection loop of a parameter measurement method is utilized, whether a power element can normally run or not is judged in a hydraulic system, and the two most important parameters are pressure and flow; firstly, a large number of experiments, empirical calculation and transformation are carried out to deduce the theoretical flow and the theoretical pressure of the seawater vane pump, and then a parameter measurement method is utilized to design a detection loop to measure the flow efficiency and the actual pressure value of the vane type seawater pump under different flows;
the method specifically comprises the following operation steps:
the first step is as follows: using geometric volumesThe method obtains a formula of theoretical discharge Q of the seawater vane pump (7) rotating for one circle:
the parameters involved are: the radius r of a small semicircular arc of the stator inner line (22), the radius Ro of the rotor (18) and the length L of the blade (21), and B is the thickness of the stator (19); calculating to obtain a theoretical discharge value Q of the blade type sea water pump;
the second step is that: obtaining the values of all supporting reaction forces borne by the blades (21) at two extreme positions, namely the large and small arc sections of the stator inner line (22), and respectively obtaining the seawater theoretical pressure F borne by the blades (21) at the large and small arc sections of the stator inner line (22) by utilizing a vector analysis method1；
The third step: f1The smaller value is taken to ensure that the blades are not damaged in the periodic rotation process, so that the theoretical pressure F of the seawater on the blades (21) is obtained1The smaller one of the measured limit values is taken and converted to obtain a pressure value P at the drainage port of the sea water pumprThe theoretical pressure limit value of the water outlet of the sea water pump is obtained;
the fourth step: the actual pressure and flow of the seawater vane pump (7) are communicated with the control valve (1) and the water outlet pipe (5) through a system loop pipe (8) by adopting a T-shaped joint (2), the detection loop (4) is communicated with the water outlet pipe (5) in parallel, and the detection loop (4) and the water outlet pipe (5) are communicated with the seawater vane pump (7) through the water inlet pipe (3);
the fifth step: the actual flow rate and the seawater pressure P of the seawater vane pump (7) are measured by a flow meter (9) and a pressure meter (10) in the detection loop (4) through the opening and closing control of a control valve (1), a loading valve (6) and a reversing valve (11), a pressure regulating valve (12) and a safety valve (13) in the detection loop (4)r' drawing efficiency and flow and pressure and flow characteristic curves; the actual value and the theoretical value are compared through efficiency and flow and pressure and flow characteristic curves, and the running condition of the seawater vane pump (7) is continuously judged;
and a sixth step: if the actual value is not in the range of the reasonable operation interval specified by the proposed judgment standard, the operation state of the seawater pump is not good, and the integration and correction are carried out to realize that the seawater vane pump (7) works in the reasonable operation interval.
2. The seawater vane pump state identification method based on the parameter measurement method as claimed in claim 1, wherein: when the blade (21) is positioned in the small arc section, the blade (21) is in the stage of the water discharge turning water absorption area, and the top end of the blade (21) bears the support reaction force N1，N1Is N2And N3A function of (a); at this time, except for the support reaction force N1、N2、N3In addition, the blades (21) are also subjected to seawater pressure F1Centrifugal force FCFrictional force F2(ii) a When the blade (21) is positioned at the large arc section, the blade (21) is in the stage of water absorption, turning to and drainage area, and the top end of the blade (21) is stressed by N1With friction force F2Very small, the force is mainly F1、FC、N2、N3。
3. The seawater vane pump state identification method based on the parameter measurement method as claimed in claim 2, wherein: when the blades are positioned in the large and small arc sections, the blades (21) bear the supporting reaction forces N which are the same in size and opposite in direction2And N3In the limit state of large and small circular arcs, the unknown quantity is the seawater pressure F1The sea water pressure F can be obtained by using a vector drawing analysis method1The specific value.
4. The seawater vane pump state identification method based on the parameter measurement method as claimed in claim 1, wherein: according to empirical formulas: p is 1.3PrWherein P is the theoretical seawater pressure to which the blade is subjected, 1.3 is an empirical rule numerical value obtained based on a large number of experiments, PrThe theoretical pressure P at the sea water pump drainage port can be obtained by the theoretical pressure value at the sea water pump drainage portrThe actual value P of the water outlet is directly measured by the detection loopr', then by the formula, F1Converting theoretical pressure P of water outlet by introducing PrThen the theoretical pressure P at the water outlet is adjustedrWith the actual pressure value Pr' comparison.
5. The seawater vane pump state identification method based on the parameter measurement method as claimed in claim 1, wherein: the seawater vane pump (7) is internally provided with 10 vanes (21) to form 10 sealed cavities, and the valve plate (16) is provided with 2 water suction areas and 2 water discharge areas; the contact mode of the rotor (18) and the bottom end of the blade (21) is upgraded from the original surface contact sliding friction to the cylindrical hinge (20) rolling friction; the blade (21) is close to the trunnions (23) extending out of two sides of the top end, the trunnions (21) on one side are in interference fit with the rolling bearings (14), and the rolling bearings (14) are placed and fixed in the annular grooves (24), so that the top ends of the blades (21) are tightly attached to the inner wires (22) of the stator.
6. The seawater vane pump state identification method based on the parameter measurement method as claimed in claim 5, wherein: the sealed volume is formed by the enclosed parts of two adjacent blades (21), a rotor (18) and a stator inner line (22), the rotor (18) rotates, when the blades (21) rotate clockwise, a small arc is transited to a large arc section, the volume of the sealed cavity is increased to form partial vacuum degree, and a water suction port (17) sucks in low-pressure water; an oil sealing area is formed between the two cavities; when the large arc is transited to the small arc section, the volume of the sealed cavity is reduced, and the water outlet (15) discharges high-pressure water.
7. The seawater vane pump state identification method based on the parameter measurement method as claimed in claim 1, wherein: closing a control valve (1) in a system loop, opening a pressure regulating valve (12) and a safety valve (13) in a detection loop, closing a reversing valve (11), enabling the whole flow of the seawater vane pump (7) to flow into the detection loop, slowly regulating a pressure regulating handle of the pressure regulating valve (12) from low to high, increasing the load of the seawater vane pump (7), and reading the actual flow and pressure values of a water outlet of the seawater vane pump (7) through a flowmeter (9) and a pressure gauge (10).
8. The seawater vane pump state identification method based on the parameter measurement method as claimed in claim 1, wherein: firstly, looking at the pressure and flow corresponding to the optimal working condition point, and comparing whether the theoretical pressure and the theoretical flow meet the fluctuation range within 1MPa and the efficiency of more than 80 percent or not; if so, taking the optimal working condition point as an identification standard, and then judging whether the deviation of the actual pressure corresponding to different flows and the pressure of the optimal working condition point is within the range of 1 MPa; if the actual flow rate and the theoretical flow rate are met, the flow rate and efficiency characteristic curve is used for calibration, whether the efficiency corresponding to the actual flow rate corresponding to the actual pressure is higher than 80% or not is judged according to the standard, and if the actual flow rate and the theoretical flow rate are met, the operation state of the point is good.
9. The seawater vane pump state identification method based on the parameter measurement method as claimed in claim 1, wherein: when the reasonable operation interval has deviation, the reasonable operation interval in the flow and pressure characteristic curve and the flow and efficiency characteristic curve needs to be corrected in an integrated manner, and the similarity degree of the two intervals is judged and corrected based on a cosine similarity algorithm; the cosine similarity formula is:
10. the seawater vane pump state identification method based on the parameter measurement method as claimed in claim 9, wherein: the intervals of the two characteristic curves are [295, 480] and [300, 473], respectively, and in a two-dimensional coordinate system, the two characteristic curves are expressed in a vector form as follows: a1 ═ (295, 480), a2 ═ 300, 473; wherein x 1-295, x 2-300, y 1-480, y 2-473; the cosine similarity formula is used for calculating the included angle between the two vectors, and the similarity between the two reasonable operation intervals is 0.9 and is very similar. And correcting by using a vector two-dimensional coordinate graph, taking the middle points (297.5, 476.5) of (295, 480) and (300, 473), and correcting the reasonable operation intervals of the two graphs to obtain the final reasonable operation interval of the flow rate [297.5, 476.5 ].
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