CN112446159B - Sea water vane pump state identification method based on parameter measurement method - Google Patents
Sea water vane pump state identification method based on parameter measurement method Download PDFInfo
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- 239000013535 sea water Substances 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 39
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- 238000001514 detection method Methods 0.000 claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
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- 239000013598 vector Substances 0.000 claims description 16
- 238000005096 rolling process Methods 0.000 claims description 10
- 238000010521 absorption reaction Methods 0.000 claims description 9
- 238000004458 analytical method Methods 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 238000012937 correction Methods 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 description 3
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/02—Reliability analysis or reliability optimisation; Failure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Abstract
The invention relates to a sea water 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 sea water pump, a detection loop of the parameter measurement method is utilized, in the hydraulic system, whether one power element can normally operate or not, and the two most important parameters are pressure and flow; the theoretical flow and the theoretical pressure of the sea water vane pump are deduced through a large number of experiments and empirical operation and conversion, and then a detection loop is designed by using a parameter measurement method to measure the flow efficiency and the actual pressure value of the vane sea water pump under different flow. Has the characteristics of simple structure, convenient operation, small abrasion and long service life. The problem of difficulty in identifying the running condition state of the seawater vane pump is solved by combining a cosine similarity algorithm. The algorithm of the theoretical value of the sea water vane pump in the parameter measurement method is perfected.
Description
Technical Field
The invention relates to the technical field of hydraulic state identification, in particular to a sea water vane pump state identification method based on a parameter measurement method.
Background
Because of the defect that the vane pump uses oil as a working medium, such as a closed system, environmental pollution, poor military confidentiality and the like, the current hydraulic system using seawater as the working medium is increasingly widely used, and the hydraulic system is a future development direction. In addition, the common double-acting positive displacement pump has a plurality of sliding friction pairs and high 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 sea water vane pump state identification method based on a parameter measurement method, which has the characteristics of simple structure, convenient operation, small abrasion and long service life. The problem of difficulty in identifying the running condition state of the seawater vane pump is solved by combining a cosine similarity algorithm. The algorithm of the theoretical value of the sea water vane pump in the parameter measurement method is perfected.
The technical problems of the invention are mainly solved by the following technical proposal:
the sea water vane pump state identifying method based on parameter measurement includes utilizing the detection loop of the parameter measurement to determine whether one power element can operate normally in hydraulic system and the two most important parameters are pressure and flow; the theoretical flow and the theoretical pressure of the sea water vane pump are deduced through a large number of experiments and empirical operation and transformation, and then a detection loop is designed by using a parameter measurement method to measure the flow efficiency and the actual pressure value of the vane sea water pump under different flow.
The method specifically comprises the following operation steps:
the first step: the formula of theoretical displacement Q of the sea water vane pump rotating for one circle is obtained by utilizing a geometric volumetric method:
the parameters involved are: the stator inner line small semicircular arc radius r, the rotor radius Ro and the blade length L are functions, and B is the thickness of the stator; and calculating to obtain the theoretical discharge value Q of the vane type sea water pump.
And a second step of: and obtaining the values of the respective counter-forces born by the circular arc sections with the size of the inner line of the stator at two limit positions of the blade, and respectively obtaining the sea water theoretical pressure F1 born by the circular arc sections with the size of the inner line of the stator by using a vector analysis method.
And a third step of: the value F1 has two values, the smaller value is taken to ensure that the blades are not damaged in the periodic rotation process, the limit value measured by the theoretical pressure F1 of the sea water on the blades is obtained, and the smaller value is taken to obtain the pressure value Pr at the water outlet of the sea water pump through conversion, namely the theoretical pressure limit value of the water outlet of the sea water pump.
Fourth step: the actual pressure and flow of the sea water vane pump are communicated with the control valve and the water outlet pipe through the system loop pipe by adopting a T-shaped joint, the detection loop is communicated with the water outlet pipe in parallel, and the detection loop and the water outlet pipe are communicated with the sea water vane pump through the water inlet pipe.
Fifth step: the actual flow and the seawater pressure Pr' of the seawater vane pump are measured by a flowmeter and a pressure meter in the detection loop 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 the detection loop, and an efficiency and flow characteristic curve and a pressure and flow characteristic curve are drawn; and comparing the actual value with the theoretical value through the efficiency and flow and pressure and flow characteristic curves, and continuously judging the running condition of the seawater vane pump.
Sixth step: if the actual value is not in the range of the reasonable operation interval specified by the proposed judgment standard, the running state of the seawater pump is poor, and the integrated correction is carried out to realize the operation of the seawater vane pump in the reasonable operation interval.
Preferably, when the blade is positioned in the small circular arc section, the blade is positioned in the stage of water discharge turning to the water absorption area, and the top end of the blade is also subjected to a supporting reaction force N 1 ，N 1 Is N 2 And N 3 Is a function of (2); in this case, in addition to the reaction force N 1 、N 2 、N 3 In addition to the sea water pressure F the blade is subjected to 1 Centrifugal force F C Friction force F 2 The method comprises the steps of carrying out a first treatment on the surface of the When the blade is positioned in the large arc section, the blade is positioned in the stage of water absorption and diversion drainage area, and the top end of the blade is stressed by N 1 With friction force F 2 If the force is small, the force is mainly F 1 、F c 、N 2 、N 3 。
Preferably, when the blades are positioned in the large arc section and the small arc section, the blades bear the supporting reaction forces N with the same magnitude and opposite directions respectively 2 And N 3 In the limit state of the large and small circular arcs, the unknown quantity is sea waterPressure F 1 The sea water pressure F can be obtained by using a vector drawing analysis method 1 Specific values.
Preferably, the empirical formula is based: p=1.3p r Wherein P is the theoretical sea water pressure to which the blade is subjected, 1.3 is an empirical law value based on a large number of experiments, and P r The theoretical pressure P at the water pump outlet can be obtained as the theoretical pressure value at the water pump outlet r The detection loop directly detects the actual value P of the water outlet r ' then through the formula, F 1 Conversion of the theoretical pressure P of the water outlet by bringing P in r Then the water outlet is treated with the theoretical pressure P r And the actual pressure value P r 'comparison'.
Preferably, the seawater vane pump comprises 10 vanes to form 10 sealed cavities, and the valve plate is provided with 2 water absorption areas and 2 water drainage areas; the contact mode of the rotor and the bottom end of the blade is changed from the original surface contact sliding friction to cylindrical hinge rolling friction; the trunnions extend out from two sides of the blade near the top end, one side of the trunnion is in interference fit with the rolling bearing, and the rolling bearing is fixedly arranged in the annular groove, so that the top end of the blade is tightly attached to the inner line of the stator.
Preferably, the sealing volume is formed by two adjacent blades, a rotor and a part surrounded by the inner line of the stator, when the rotor rotates and the blades rotate clockwise, the small circular arc is transited to the large circular arc section, the volume of the sealing cavity is increased, partial vacuum degree is formed, and the water sucking port sucks low-pressure water; an oil sealing area is formed between the two cavities; and when the large arc is transited to the small arc section, the volume of the sealed containing cavity is reduced, and the water outlet discharges high-pressure water.
Preferably, a control valve in a system loop is closed, a pressure regulating valve and a safety valve in a 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 firstly looked at the pressure and the flow corresponding to the optimal working point, and compared with the theoretical pressure and the theoretical flow, whether the fluctuation range within 1MPa and the efficiency above 80% are satisfied or not; if the pressure difference is met, taking the optimal working point as an identification standard, and then checking whether the deviation between the actual pressure corresponding to different flows and the pressure of the optimal working point is within a range of 1MPa; if so, the flow and efficiency characteristic curve is used for calibration, the theoretical flow is used as a standard, whether the efficiency corresponding to the actual flow corresponding to the actual pressure is higher than 80% or not is judged, and if the flow and the efficiency characteristic curve are both satisfied, the point is in good running state.
Preferably, when deviation occurs in a reasonable operation interval, the reasonable operation interval in the corrected flow and pressure characteristic curve and the flow and efficiency characteristic curve is required to be integrated, 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 two characteristic curves have intervals of [295, 480] and [300, 473], respectively, and are represented in vector form in a two-dimensional coordinate system as: a1 = (295, 480), a2= (300, 473); wherein x1=295, x2=300, y1=480, y2=473; and calculating an included angle between the two vectors by using a cosine similarity formula to obtain that the similarity between the two reasonable operation intervals is 0.9 and the two reasonable operation intervals are very similar. And correcting by using the vector two-dimensional coordinate graph, taking the midpoints (297.5, 476.5) of (295, 480) and (300, 473), and correcting the reasonable operation interval of the two graphs to obtain the final flow reasonable operation interval [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. The problem of difficulty in identifying the running condition state of the seawater vane pump is solved by combining a cosine similarity algorithm. The algorithm of the theoretical value of the sea water vane pump in the parameter measurement method is perfected. And judging the similarity between the two characteristic curve sections by using a similarity algorithm, and integrating and correcting the reasonable operation sections 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 structure 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 graph of force analysis of a small arc segment of a blade according to the present invention.
FIG. 5 is a force analysis graph of a large arc segment of a blade according to the present invention.
FIG. 6 is a graph of flow versus pressure characteristics of the present invention.
FIG. 7 is a graph of flow versus efficiency characteristics 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 sea water 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 valve plate 16, a water suction port 17, a rotor 18, a stator 19, a cylindrical hinge 20, vanes 21, a stator inner line 22, a trunnion 23 and an annular groove 24.
Detailed Description
The technical scheme of the invention is further specifically described below through examples and with reference to the accompanying drawings.
Examples: as shown in fig. 1-8, a method for identifying the state of a sea water vane pump based on a parameter measurement method is provided, aiming at a vane sea water pump, a detection loop of the parameter measurement method is utilized, in a hydraulic system, whether a power element can normally operate or not, and the two most important parameters are pressure and flow; the theoretical flow and the theoretical pressure of the sea water vane pump are deduced through a large number of experiments and empirical operation and transformation, and then a detection loop is designed by using a parameter measurement method to measure the flow efficiency and the actual pressure value of the vane sea water pump under different flow.
The method specifically comprises the following operation steps:
the first step: the formula of theoretical displacement Q of the sea water vane pump 7 for one rotation is obtained by utilizing a geometric volumetric method:
the parameters involved are: the stator inner line 22 is a function of the small semi-circular arc radius r, the radius Ro of the rotor 18 and the length L of the blade 21, B being the thickness of the stator 19; and calculating to obtain the theoretical discharge value Q of the vane type sea water pump.
And a second step of: obtaining the values of the respective counter-forces which the blades 21 can bear at the two extreme positions, namely the circular arc sections of the stator inner line 22, and respectively obtaining the sea water theoretical pressure F which the blades 21 bear at the circular arc sections of the stator inner line 22 by using a vector analysis method 1 。
When the blade 21 is positioned in the small arc section, the blade 21 is positioned at the stage of the drainage turning to the water absorption area, and the top end of the blade 21 is also subjected to the supporting reaction force N 1 ，N 1 Is N 2 And N 3 Is a function of (2); in this case, in addition to the reaction force N 1 、N 2 、N 3 In addition, the blades 21 are subjected to sea water pressure F 1 Centrifugal force F C Friction force F 2 The method comprises the steps of carrying out a first treatment on the surface of the When the blade 21 is positioned in the large arc section, the blade 21 is positioned in the stage of water absorption and diversion drainage area, and the top end of the blade 21 is stressed N 1 With friction force F 2 If the force is small, the force is mainly F 1 、F C 、N 2 、N 3 。
When in the large and small arc sections, the blades 21 respectively bear the supporting reaction forces N with the same magnitude and opposite directions 2 And N 3 In the limit state of the large and small circular arcs, the unknown quantity is the sea water pressure F 1 The sea water pressure F can be obtained by using a vector drawing analysis method 1 Specific values.
And a third step of: f (F) 1 There are two values, the smaller one is taken to ensure that the blades are not destroyed during the periodic rotation, thus obtaining the theoretical pressure F of the sea water on the blades 21 1 The measured limit value is smaller, and the pressure value P at the water outlet of the sea water pump can be obtained through conversion r The theoretical pressure limit value of the water outlet of the sea water pump is obtained.
According to the empirical formula: p=1.3P r Wherein P is the theoretical sea water pressure to which the blade is subjected, 1.3 is an empirical law value based on a large number of experiments, and P r The theoretical pressure P at the water pump outlet can be obtained as the theoretical pressure value at the water pump outlet r The detection loop directly detects the actual value P of the water outlet r ' then through the formula, F 1 Conversion of the theoretical pressure P of the water outlet by bringing P in r Then the water outlet is treated with the theoretical pressure P r And the actual pressure value P r 'comparison'.
Fourth step: the actual pressure and flow of the sea water vane pump 7 are communicated with the control valve 1 and the water outlet pipe 5 through the system loop pipe 8 by adopting the T-shaped joint 2, the detection loop 4 and the water outlet pipe 5 are communicated in parallel, and meanwhile, the detection loop 4 and the water outlet pipe 5 are communicated with the sea water vane pump 7 through the water inlet pipe 3.
The seawater vane pump 7 comprises 10 vanes 21 to form 10 sealed cavities, and the valve plate 16 is provided with 2 water absorption areas and 2 water drainage areas; the contact mode of the rotor 18 and the bottom ends of the blades 21 is updated from the original surface contact sliding friction to the rolling friction of the cylindrical hinge 20; the blade 21 is close to the trunnions 23 extending from the two sides of the top end, one side of the trunnion 21 is in interference fit with the rolling bearing 14, and the rolling bearing 14 is fixedly arranged in the annular groove 24, so that the top ends of the blade 21 are closely attached to the inner line 22 of the stator. The sealed volume is formed by two adjacent blades 21, a rotor 18 and a stator inner line 22, when the rotor 18 rotates and the blades 21 rotate clockwise, the small circular arc is transited to the large circular arc section, the volume of the sealed cavity is increased, partial vacuum degree is formed, and the water suction port 17 sucks 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 containing cavity is reduced, and the water outlet 15 discharges high-pressure water.
Fifth step: the actual flow and the sea water pressure Pr' of the sea water vane pump 7 are measured by a flowmeter 9 and a pressure gauge 10 in the detection loop 4 through the opening and closing control of a control valve 1, a loading valve 6, a reversing valve 11, a pressure regulating valve 12 and a safety valve 13 in the detection loop 4, and an efficiency and flow and pressure and flow characteristic curve are drawn; and comparing the actual value with the theoretical value through the efficiency and flow and pressure and flow characteristic curves, and continuously judging the running condition of the seawater vane pump 7.
The control valve 1 in the system loop is closed, the pressure regulating valve 12 and the safety valve 13 in the detection loop are opened, the reversing valve 11 is closed, the whole flow of the sea water vane pump 7 flows into the detection loop, the pressure regulating handle of the pressure regulating valve 12 is slowly regulated from low to high, the load of the sea water vane pump 7 is increased, and the flow and the actual pressure value of the water outlet of the sea water vane pump 7 are read through the flowmeter 9 and the pressure gauge 10.
Firstly, looking at the pressure and the flow corresponding to the optimal working 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 the pressure difference is met, taking the optimal working point as an identification standard, and then checking whether the deviation between the actual pressure corresponding to different flows and the pressure of the optimal working point is within a range of 1MPa; if so, the flow and efficiency characteristic curve is used for calibration, the theoretical flow is used as a standard, whether the efficiency corresponding to the actual flow corresponding to the actual pressure is higher than 80% or not is judged, and if the flow and the efficiency characteristic curve are both satisfied, the point is in good running state.
Sixth step: if the actual value is not in the range of the reasonable operation interval specified by the proposed judgment standard, the running state of the seawater pump is poor, and the integrated correction is carried out to realize the operation of the seawater vane pump 7 in the reasonable operation interval.
When deviation occurs in the reasonable operation interval, the reasonable operation interval in the corrected flow and pressure characteristic curve and the flow and efficiency characteristic curve is required to be integrated, and the similarity degree of the two intervals is judged and corrected based on a cosine similarity algorithm; the cosine similarity formula is:
the rotation speed of the sea water vane pump 7 is 1000r/min, and the ratio of the length of the line segment to the actual size on the graph is utilized to obtain a small arc segment F at two limit positions by a vector drawing method 1 =18.6 MPa, major arc segment F 1 =8.6 MPa. Ensuring that the blade is not damaged, taking a smaller value of the limiting pressure, and then the theoretical pressure F of the blade 1 8.6MPa. Reuse p=1.3p r Conversion is carried outTheoretical value of water outlet pressure P r ＝6.88MPa.
The structural parameters of the seawater vane pump 7 include: the thickness b=40dm of the stator 19; the large half arc radius r=50dm of the stator inner wire 22; the small semi-circular radius r=45dm of the stator inner wire 22; radius R of rotor 18 0 =20dm; the length l=30dm of the blade 21. The theoretical flow of the sea water pump is that:
the detection loop is designed to test the actual pressure and flow under different flow conditions. The flow increases and the load increases and the pressure increases. And drawing a characteristic curve of water outlet flow-pressure and flow-efficiency by combining data obtained by experimental measurement of a specific pump. The positive displacement rotor pump is suitable for the occasion with low rotating speed, the rotating speed is less than 1500r/min, the liquid is delivered with pulses, the average flow is constant, and the suction capacity is good.
Under the condition of 1000r/min of rotating speed, the flow rate of the optimal working point is 320m 3 And/h, the corresponding pressure is 6MPa, and the efficiency=320/382×100% =83% > 80% is judged by using the proposed standard; pressure bias = 6.88-6 = 0.88MPa < 1MPa. Then the optimum operating point can be used for further analysis.
The flow rate is 306m 3 At the time of/h, the corresponding pressure is 5.2MPa, and the pressure deviation is 6-5.2=0.8 < 1MPa; calibration was performed using a flow-efficiency curve, when the flow corresponding to a pressure of 5.2MPa was 306m 3 And/h, the efficiency at this time being 80.1% > 80%. In this flow state, the pressure and flow efficiency are both satisfied, so the flow rate is 306m 3 At/h, the pump operating condition is good.
The reasonable running 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 as vectors: a1 = (295, 480), a2= (300, 473); wherein x1=295, x2=300, y1=480, y2=473; and calculating an included angle between the two vectors by using a cosine similarity formula to obtain that the similarity between the two reasonable operation intervals is 0.9 and the two reasonable operation intervals are very similar. And correcting by using the vector two-dimensional coordinate graph, taking the midpoints (297.5, 476.5) of (295, 480) and (300, 473), and correcting the reasonable operation interval of the two graphs to obtain the final flow reasonable operation interval [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. The problem of difficulty in identifying the running condition state of the seawater vane pump is solved by combining a cosine similarity algorithm. The algorithm of the theoretical value of the sea water vane pump in the parameter measurement method is perfected.
The above embodiments are merely examples of the present invention, but the present invention is not limited thereto, and any changes or modifications made by those skilled in the art are included in the scope of the present invention.
Claims (10)
1. A sea water vane pump state identification method based on a parameter measurement method is characterized in that: aiming at the vane type sea water pump, a detection loop of a parameter measurement method is utilized, in a hydraulic system, whether one power element can normally operate or not, and the two most important parameters are pressure and flow; the theoretical flow and the theoretical pressure of the sea water vane pump are deduced through a large number of experiments and empirical operation and transformation, and then a detection loop is designed by using a parameter measurement method to measure the flow efficiency and the actual pressure value of the vane sea water pump under different flow;
the method specifically comprises the following operation steps:
the first step: the formula of theoretical displacement Q of the seawater vane pump (7) rotating for one circle is obtained by utilizing a geometric volumetric method:
the parameters involved are: the stator inner line (22) is a function of the small semicircle radius r, the radius Ro of the rotor (18) and the length L of the blade (21), B is the thickness of the stator (19); calculating to obtain a theoretical discharge value Q of the vane type sea water pump;
and a second step of: obtaining the vane (21) at two extreme positions, i.e. the statorThe values of the respective counter forces which can be borne by the inner line (22) large and small circular arc segments are obtained by a vector analysis method, and the theoretical sea water pressure F borne by the blades (21) in the stator inner line (22) large and small circular arc segments is obtained 1 ；
And a third step of: theoretical pressure F of sea water 1 Has two values, the smaller one is taken to ensure that the blades are not damaged during the periodic rotation, thus obtaining the sea water theoretical pressure F of the sea water to the blades (21) 1 The measured limit value is smaller, and the pressure value P at the water outlet of the sea water pump can be obtained through conversion r The theoretical pressure limit value of the water outlet of the sea water pump is obtained;
fourth step: the actual pressure and flow of the sea water vane pump (7) are communicated with the control valve (1) and the water outlet pipe (5) through the system loop pipe (8) by adopting the T-shaped joint (2), the detection loop (4) and the water outlet pipe (5) are communicated in parallel, and meanwhile, the detection loop (4) and the water outlet pipe (5) are communicated with the sea water vane pump (7) through the water inlet pipe (3);
fifth step: the actual flow rate and the sea water pressure P of the sea water vane pump (7) are measured by a flowmeter (9) and a pressure gauge (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 an efficiency and flow and a pressure and flow characteristic curve; comparing the actual value with the theoretical value through the efficiency and flow and pressure and flow characteristic curves, and continuously judging the running condition of the seawater vane pump (7);
sixth step: if the actual value is not in the range of the reasonable operation interval specified by the proposed judgment standard, the running state of the seawater pump is poor, and the integrated correction is carried out to realize the operation of the seawater vane pump (7) in the reasonable operation interval.
2. The method for identifying the state of the seawater vane pump based on the parameter measurement method according to claim 1, wherein the method comprises the following steps: when the blade (21) is positioned at the small arc section, the blade (21) is positioned at the stage of the drainage turning to the water absorption area, and the top end of the blade (21) also bears a supporting counterforce N 1 ，N 1 Is N 2 And N 3 Is a function of (2); in this case, in addition to the reaction force N 1 、N 2 、N 3 In addition, the blades (21) are subjected to the theoretical sea water pressure F 1 Centrifugal force F C Friction force F 2 The method comprises the steps of carrying out a first treatment on the surface of the When the blade (21) is positioned at the large arc section, the blade (21) is positioned at the stage of water absorption and diversion drainage area, and the top end of the blade (21) is supported by the counterforce N 1 With friction force F 2 If the force is small, the force is mainly F 1 、F C 、N 2 、N 3 。
3. The method for identifying the state of the seawater vane pump based on the parameter measurement method according to claim 2, wherein the method comprises the following steps: when the blades (21) are positioned at the large and small circular arc sections, the blades respectively bear the supporting reaction forces N with the same magnitude and opposite directions 2 And N 3 In the limit state of the large and small circular arcs, unknown quantity is the theoretical pressure F of the sea water 1 The theoretical pressure F of the seawater can be obtained by using a vector drawing analysis method 1 Specific values.
4. The method for identifying the state of the seawater vane pump based on the parameter measurement method according to claim 1, wherein the method comprises the following steps: according to the empirical formula: p=1.3p r Wherein P is the theoretical sea water pressure to which the blade is subjected, 1.3 is an empirical law value based on a large number of experiments, and P r The theoretical pressure P at the water pump outlet can be obtained as the theoretical pressure value at the water pump outlet r The detection loop directly detects the actual value P of the water outlet r ' then, by formula, the theoretical pressure F of sea water 1 Conversion of the theoretical pressure P of the water outlet by bringing P in r Then the water outlet is treated with the theoretical pressure P r And the actual pressure value P r 'comparison'.
5. The method for identifying the state of the seawater vane pump based on the parameter measurement method according to claim 1, wherein the method comprises the following steps: the seawater vane pump (7) comprises 10 vanes (21) to form 10 sealed cavities, and the valve plate (16) is provided with 2 water absorption areas and 2 water drainage areas; the contact mode of the rotor (18) and the bottom end of the blade (21) is updated from the original surface contact sliding friction to the rolling friction of the cylindrical hinge (20); the blades (21) are close to trunnions (23) extending from two sides of the top end, one side of the trunnions (23) is in interference fit with the rolling bearing (14), and the rolling bearing (14) is fixedly arranged in the annular groove (24) so that the top ends of the blades (21) are tightly attached to the inner line (22) of the stator.
6. The method for identifying the state of the seawater vane pump based on the parameter measurement method according to claim 5, wherein the method comprises the following steps: the sealed volume is formed by two adjacent blades (21), a rotor (18) and a stator inner line (22), the rotor (18) rotates, when the blades (21) rotate clockwise, the small circular arc is transited to the large circular arc section, the volume of the sealed cavity is increased, partial vacuum degree is formed, and the water suction port (17) sucks 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 method for identifying the state of the seawater vane pump based on the parameter measurement method according to claim 1, wherein the method comprises the following steps: the control valve (1) in the system loop is closed, the pressure regulating valve (12) and the safety valve (13) in the detection loop are opened, the reversing valve (11) is closed, the whole flow of the seawater vane pump (7) flows into the detection loop, the pressure regulating handle of the pressure regulating valve (12) is slowly regulated from low to high, the load of the seawater vane pump (7) is increased, and the actual flow and pressure of the water outlet of the seawater vane pump (7) are read through the flowmeter (9) and the pressure gauge (10).
8. The method for identifying the state of the seawater vane pump based on the parameter measurement method according to claim 1, wherein the method comprises the following steps: firstly, looking at the pressure and the flow corresponding to the optimal working 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 the pressure difference is met, taking the optimal working point as an identification standard, and then checking whether the deviation between the actual pressure corresponding to different flows and the pressure of the optimal working point is within a range of 1MPa; if so, the flow and efficiency characteristic curve is used for calibration, the theoretical flow is used as a standard, whether the efficiency corresponding to the actual flow corresponding to the actual pressure is higher than 80% or not is judged, and if the flow and the efficiency characteristic curve are both satisfied, the point is in good running state.
9. The method for identifying the state of the seawater vane pump based on the parameter measurement method according to claim 1, wherein the method comprises the following steps: when deviation occurs in the reasonable operation interval, the reasonable operation interval in the corrected flow and pressure characteristic curve and the flow and efficiency characteristic curve is required to be integrated, 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 method for identifying the state of the seawater vane pump based on the parameter measurement method according to claim 9, wherein the method comprises the following steps: 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 as vectors: a1 = (295, 480), a2= (300, 473); wherein x1=295, x2=300, y1=480, y2=473; calculating an included angle between the two vectors by using a cosine similarity formula to obtain a similarity of 0.9 between two reasonable operation intervals, wherein the similarity is very similar; and correcting by using the vector two-dimensional coordinate graph, taking the midpoints (297.5, 476.5) of (295, 480) and (300, 473), and correcting the reasonable operation interval of the two graphs to obtain the final flow reasonable operation interval [297.5, 476.5].
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1847715A1 (en) * | 2006-04-19 | 2007-10-24 | Siemens Aktiengesellschaft | Method for operation of a turbocompressor and turbocompressor |
| JP2010014101A (en) * | 2008-06-05 | 2010-01-21 | Kayaba Ind Co Ltd | Multiple vane pump |
| CN108287571A (en) * | 2018-01-26 | 2018-07-17 | 温州大学 | A kind of flow control system pump operation interval judgement method |
| CN110939567A (en) * | 2019-12-11 | 2020-03-31 | 秦川机床工具集团股份公司 | Variable-displacement vane type steering oil pump and eccentricity adjusting method thereof |
-
2020
- 2020-12-16 CN CN202011490309.5A patent/CN112446159B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1847715A1 (en) * | 2006-04-19 | 2007-10-24 | Siemens Aktiengesellschaft | Method for operation of a turbocompressor and turbocompressor |
| JP2010014101A (en) * | 2008-06-05 | 2010-01-21 | Kayaba Ind Co Ltd | Multiple vane pump |
| CN108287571A (en) * | 2018-01-26 | 2018-07-17 | 温州大学 | A kind of flow control system pump operation interval judgement method |
| CN110939567A (en) * | 2019-12-11 | 2020-03-31 | 秦川机床工具集团股份公司 | Variable-displacement vane type steering oil pump and eccentricity adjusting method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 叶片形式对串并联泵内部流场及压力脉动的影响;石海峡;邹文鹏;李跃;黄鑫;;中国农村水利水电(第05期);全文 * |
| 基于能量梯度方法的叶片数对离心泵稳定性影响研究;郑路路;窦华书;蒋威;陈小平;朱祖超;崔宝玲;;浙江理工大学学报(第01期);全文 * |
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