CN109162910B - Cargo oil pump performance testing device and testing method - Google Patents
Cargo oil pump performance testing device and testing method Download PDFInfo
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- CN109162910B CN109162910B CN201810697823.2A CN201810697823A CN109162910B CN 109162910 B CN109162910 B CN 109162910B CN 201810697823 A CN201810697823 A CN 201810697823A CN 109162910 B CN109162910 B CN 109162910B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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Abstract
The invention discloses a device and a method for testing the performance of a cargo oil pump, and belongs to the field of cargo oil pumps. The testing device comprises a flow module, a cavitation module, a pressure module, a torquemeter and a calculation control module, wherein the flow module comprises a steady flow tank, a flow regulating valve and a flowmeter, a first water inlet of the steady flow tank is communicated with a water outlet of the flow regulating valve, a water inlet of the flow regulating valve is used for being communicated with a water outlet of a cargo oil pump to be tested, and the flowmeter is arranged on a pipeline between the flow regulating valve and the cargo oil pump to be tested; the cavitation module comprises a cavitation tank and a vacuum pump, a water outlet of the cavitation tank is communicated with a water inlet of the cargo oil pump to be tested, a first water inlet of the cavitation tank is communicated with a water outlet of the flow stabilizing tank, and a gas inlet of the vacuum pump is respectively communicated with a vacuum interface of the flow stabilizing tank and a vacuum interface of the cavitation tank; the pressure module comprises an inlet pressure measuring pipe and an outlet pressure measuring pipe; the torque meter is connected with a rotating shaft of the cargo oil pump to be tested. The invention can detect the working performance of the cargo oil pump.
Description
Technical Field
The invention belongs to the field of cargo oil pumps, and particularly relates to a cargo oil pump performance testing device and a cargo oil pump performance testing method.
Background
The cargo oil pump is a core device of a cargo loading and unloading system on a tanker, a chemical tanker or an FPSO (Floating Production Storage and offloading) and has a main function of pumping cargo oil or transferring oil between oil tanks.
In order to ensure that the cargo oil pump can have good working performance in actual work, the cargo oil pump needs to be tested. However, since the performance of the cargo oil pump is related to a plurality of parameters, such as lift, efficiency and effective cavitation margin, it is often necessary to measure the pump separately and repeatedly, and the process is very complicated and inefficient.
Disclosure of Invention
The embodiment of the invention provides a device and a method for testing the performance of a cargo oil pump, which can be used for detecting the working performance of the cargo oil pump. The technical scheme is as follows:
in one aspect, an embodiment of the present invention provides a device for testing the performance of a cargo oil pump, where the device includes a flow module, a cavitation module, a pressure module, a torque meter, and a calculation control module,
the flow module comprises a flow stabilizing tank, a flow regulating valve and a flowmeter, a first water inlet of the flow stabilizing tank is communicated with a water outlet of the flow regulating valve, a water inlet of the flow regulating valve is used for being communicated with a water outlet of a cargo oil pump to be tested, and the flowmeter is arranged on a pipeline between the flow regulating valve and the cargo oil pump to be tested;
the cavitation module comprises a cavitation tank and a vacuum pump, a water outlet of the cavitation tank is communicated with a water inlet of the cargo oil pump to be tested, a first water inlet of the cavitation tank is communicated with a water outlet of the flow stabilizing tank, and an air inlet of the vacuum pump is respectively communicated with vacuum interfaces of the flow stabilizing tank and the cavitation tank;
the pressure module comprises an inlet pressure measuring pipe and an outlet pressure measuring pipe, the inlet pressure measuring pipe is arranged at a water inlet of the cargo oil pump to be detected, and the outlet pressure measuring pipe is arranged at a water outlet of the cargo oil pump to be detected;
the torque meter is connected with a rotating shaft of the cargo oil pump to be tested;
the calculation control module is respectively electrically connected with the flowmeter, the inlet pressure measuring pipe, the outlet pressure measuring pipe and the torquemeter, and is used for calculating to obtain a performance curve chart of the cargo oil pump to be measured according to data measured by the flowmeter, the inlet pressure measuring pipe, the outlet pressure measuring pipe and the torquemeter.
In one implementation of the invention, the flow module further includes a first stop valve disposed at the first water inlet of the steady flow tank.
In another implementation manner of the present invention, the cavitation module further includes a second stop valve, and the second stop valve is disposed at a water outlet of the cavitation tank.
In yet another implementation of the invention, the cavitation module further comprises a vacuum valve disposed at an inlet of the vacuum pump.
In another implementation manner of the invention, the testing device further comprises a third stop valve, and a port of the third stop valve is respectively communicated with the second water inlet of the steady flow tank and the second water inlet of the cavitation tank.
On the other hand, the embodiment of the invention provides a method for testing the performance of a cargo oil pump, which is suitable for the testing device, and comprises the following steps:
acquiring the height difference of a water outlet of the cargo oil pump to be detected relative to a water inlet of the cargo oil pump to be detected, the pressure of the water outlet of the cargo oil pump to be detected, the pressure of the water inlet of the cargo oil pump to be detected, the flow of the water outlet of the cargo oil pump to be detected, the cross-sectional area of the water inlet of the cargo oil pump to be detected and the cross-sectional area of the water outlet of the cargo oil pump to be;
calculating to obtain the lift of the cargo oil pump to be detected according to the height difference of the water outlet of the cargo oil pump to be detected relative to a lift datum plane, the water outlet pressure of the cargo oil pump to be detected, the water inlet pressure of the cargo oil pump to be detected, the water outlet flow of the cargo oil pump to be detected, the water inlet cross-sectional area of the cargo oil pump to be detected and the water outlet cross-sectional area of the cargo oil pump to be detected;
adjusting the flow of a water outlet of the cargo oil pump to be detected to obtain a flow lift curve chart;
acquiring the rotating speed of the cargo oil pump to be tested and the torque of the cargo oil pump to be tested;
calculating to obtain the output power of the cargo oil pump to be detected according to the flow of a water outlet of the cargo oil pump to be detected and the lift of the cargo oil pump to be detected, and calculating to obtain the shaft power of the cargo oil pump to be detected according to the rotating speed of the cargo oil pump to be detected and the torque of the cargo oil pump to be detected;
calculating the efficiency of the cargo oil pump to be detected according to the output power of the cargo oil pump to be detected and the shaft power of the cargo oil pump to be detected;
adjusting the flow of a water outlet of the cargo oil pump to be detected to obtain a flow efficiency curve chart;
acquiring the height difference of a water inlet of the cargo oil pump to be detected relative to a cavitation allowance reference surface;
calculating to obtain the effective cavitation allowance of the cargo oil pump to be detected according to the height difference of the water inlet of the cargo oil pump to be detected relative to the cavitation allowance reference surface and the pressure of the water outlet of the cargo oil pump to be detected;
adjusting the pressure of a water outlet of the cargo oil pump to be detected to obtain a cavitation allowance curve graph;
and obtaining a performance test result of the cargo oil pump to be tested according to the flow lift curve chart, the flow efficiency curve chart and the cavitation allowance curve chart.
Further, the test method comprises the following steps: the lift of the cargo oil pump to be tested is calculated by the following formula:
wherein H is the lift of the cargo oil pump to be tested, ZdIs the height of the water outlet of the cargo oil pump to be measured, ZsIs the height of the water inlet of the cargo oil pump to be tested, PdIs the outlet pressure, P, of the cargo oil pump to be measuredsIs the pressure of the water inlet of the cargo oil pump to be tested, Q is the flow of the water outlet of the cargo oil pump to be tested, SdIs the cross section area, S, of the water outlet of the cargo oil pump to be testedsThe cross section of a water inlet of the cargo oil pump to be detected is shown as rho, the density of liquid in the cargo oil pump to be detected is shown as g, and the gravity acceleration is shown as g.
Further, the test method comprises the following steps: the efficiency of the cargo oil pump to be tested is calculated by the following formula:
wherein, P1Is the output power, P, of the cargo oil pump to be measured2Is the shaft power of the cargo oil pump to be tested, and n is the cargo oil to be testedThe rotating speed of the pump, T is the torque of the cargo oil pump to be tested, and η is the efficiency of the cargo oil pump to be tested.
Further, the test method comprises the following steps: the effective cavitation allowance of the cargo oil pump to be measured is calculated by the following formula:
wherein, NPSHaIs the effective cavitation margin, P, of the cargo oil pump to be testedaAt atmospheric pressure, PvPressure required for vaporizing said liquid, ZdThe height difference of the water inlet of the cargo oil pump to be detected relative to the cavitation allowance reference surface.
Further, adjust the delivery port pressure of cargo oil pump that awaits measuring, include:
and gradually increasing the rated flow of the cargo oil pump to be tested from 0% to 120%.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
when the working performance of the cargo oil pump is tested by the testing device provided by the embodiment of the invention, the cargo oil pump to be tested and the testing device are firstly installed in place. And then the cavitation tank is communicated with a water inlet of the cargo oil pump to be tested, and the flow stabilizing tank is communicated with a water outlet of the cargo oil pump to be tested, so that a circulating loop is formed among the cavitation tank, the cargo oil pump to be tested and the flow stabilizing tank. And then starting the cargo oil pump to be measured, adjusting the flow of a water outlet of the cargo oil pump to be measured through a flow adjusting valve, and measuring the real-time change of the outlet flow of the cargo oil pump to be measured through a flowmeter, so that the parameters corresponding to the outlet pressure of the cargo oil pump to be measured under different outlet flows can be measured through an outlet pressure measuring pipe, and the parameters corresponding to the inlet pressure of the cargo oil pump to be measured under different outlet flows can be measured through an inlet pressure measuring pipe. Through the parameters, the corresponding lift and the corresponding efficiency of the cargo oil pump to be detected under different outlet flows can be calculated, and a flow-lift curve graph and a flow-efficiency curve graph are obtained. In addition, the inlet pressure of the cargo oil pump to be tested is adjusted through the vacuum pump, so that the corresponding effective cavitation allowance of the cargo oil pump to be tested under different inlet pressures can be calculated, a cavitation allowance curve graph is obtained, and the working performance of the cargo oil pump to be tested is obtained through a flow-lift curve graph, a flow-efficiency curve graph and a cavitation allowance curve graph.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a cargo oil pump performance testing device provided by an embodiment of the invention;
FIG. 2 is a flow chart of a testing method provided by the embodiment of the invention
FIG. 3 is a graph illustrating a performance test of a cargo oil pump according to an embodiment of the present invention;
FIG. 4 is a graph of the cavitation margin of a cargo pump provided by an embodiment of the present invention;
the symbols in the drawings represent the following meanings:
the device comprises a flow module, a flow stabilizing tank, a flow regulating valve, a flow meter, a first stop valve, a 2 cavitation module, a 21 cavitation tank, a 22 vacuum pump, a 23 second stop valve, a 24 vacuum valve, a 3 pressure module, an 31 inlet pressure measuring pipe, a 32 outlet pressure measuring pipe, a 4 torque meter, a 5 calculation control module, a 6 third stop valve and a 100 cargo oil pump to be tested.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The embodiment of the invention provides a device for testing the performance of a cargo oil pump, and as shown in fig. 1, the device comprises a flow module 1, a cavitation module 2, a pressure module 3, a torque meter 4 and a calculation control module 5.
The flow module 1 comprises a steady flow tank 11, a flow regulating valve 12 and a flowmeter 13, a first water inlet of the steady flow tank 11 is communicated with a water outlet of the flow regulating valve 12, a water inlet of the flow regulating valve 12 is used for communicating a water outlet of the cargo oil pump 100 to be detected, and the flowmeter 13 is arranged on a pipeline between the flow regulating valve 12 and the cargo oil pump 100 to be detected.
The cavitation module 2 comprises a cavitation tank 21 and a vacuum pump 22, a water outlet of the cavitation tank 21 is communicated with a water inlet of the cargo oil pump 100 to be tested, a first water inlet of the cavitation tank 21 is communicated with a water outlet of the flow stabilizing tank 11, and an air inlet of the vacuum pump 22 is respectively communicated with vacuum interfaces of the flow stabilizing tank 11 and the cavitation tank 21.
The pressure module 3 comprises an inlet pressure measuring pipe 31 and an outlet pressure measuring pipe 32, the inlet pressure measuring pipe 31 is arranged at a water inlet of the cargo oil pump 100 to be tested, and the outlet pressure measuring pipe 32 is arranged at a water outlet of the cargo oil pump 100 to be tested.
The torque meter 4 is connected with a rotating shaft of the cargo oil pump 100 to be tested.
The calculation control module 5 is electrically connected with the flowmeter 13, the inlet pressure measuring pipe 31, the outlet pressure measuring pipe 32 and the torquemeter 4 respectively, and the calculation control module 5 is used for calculating to obtain a performance curve chart of the cargo oil pump 100 to be measured according to data measured by the flowmeter 13, the inlet pressure measuring pipe 31, the outlet pressure measuring pipe 32 and the torquemeter 4.
When the working performance of the cargo oil pump is tested by the testing device provided by the embodiment of the invention, the cargo oil pump to be tested and the testing device are firstly installed in place. And then the cavitation tank is communicated with a water inlet of the cargo oil pump to be tested, and the flow stabilizing tank is communicated with a water outlet of the cargo oil pump to be tested, so that a circulating loop is formed among the cavitation tank, the cargo oil pump to be tested and the flow stabilizing tank. And then starting the cargo oil pump to be measured, adjusting the flow of a water outlet of the cargo oil pump to be measured through a flow adjusting valve, and measuring the real-time change of the outlet flow of the cargo oil pump to be measured through a flowmeter, so that the parameters corresponding to the outlet pressure of the cargo oil pump to be measured under different outlet flows can be measured through an outlet pressure measuring pipe, and the parameters corresponding to the inlet pressure of the cargo oil pump to be measured under different outlet flows can be measured through an inlet pressure measuring pipe. Through the parameters, the corresponding lift and the corresponding efficiency of the cargo oil pump to be detected under different outlet flows can be calculated, and a flow-lift curve graph and a flow-efficiency curve graph are obtained. In addition, the inlet pressure of the cargo oil pump to be tested is adjusted through the vacuum pump, so that the corresponding effective cavitation allowance of the cargo oil pump to be tested under different inlet pressures can be calculated, a cavitation allowance curve graph is obtained, and the working performance of the cargo oil pump to be tested is obtained through a flow-lift curve graph, a flow-efficiency curve graph and a cavitation allowance curve graph.
In the above implementation, the performance graph may include a flow-head graph, a flow-efficiency graph, and a cavitation margin graph. In other embodiments, the performance graph may also include other graphs, such as a flow-axis power graph, and the like, which are not limited by the present invention.
In the present embodiment, the calculation control module 5 may be a control device with a PLC (Programmable logic controller).
In this embodiment, the flow module 1 further comprises a first stop valve 14, and the first stop valve 14 is disposed at the first water inlet of the steady flow tank 11.
In the above-described implementation, the first shut-off valve 14 is used to prevent the liquid in the ballast tank from flowing out when the ballast tank 11 is maintenance cleaned.
Alternatively, the first shut-off valve 14 may be a solenoid valve, and the first shut-off valve 14 is electrically connected to the calculation control module 5, so that the first shut-off valve 14 can be remotely operated by the calculation control module 5. In other embodiments, the first shut-off valve 14 may also be a manual shut-off valve, which is locally controlled by an operator to ensure the reliability of the first shut-off valve 14.
In this embodiment, the cavitation module 2 further includes a second stop valve 23, and the second stop valve 23 is disposed at the water outlet of the cavitation tank 21.
In the above implementation, the second stop valve 23 is used to prevent the liquid in the cavitation tank 21 from flowing out when the cavitation tank 21 is maintenance-cleaned.
Alternatively, the second cut-off valve 23 may be a solenoid valve, and the second cut-off valve 23 is electrically connected to the calculation control module 5, so that the second cut-off valve 23 can be remotely operated by the calculation control module 5. In other embodiments, the second stop valve 23 may also be a manual stop valve, which is locally controlled by an operator to ensure the reliability of the second stop valve 23.
In the present embodiment, the cavitation module 2 further includes a vacuum valve 24, and the vacuum valve 24 is disposed at an inlet of the vacuum pump 22.
In the above implementation, the vacuum valve 24 may function to switch the vacuum pump 22 and the cavitation tank 21 and the vacuum pump 22 and the flow stabilization tank 11 on and off.
Alternatively, when the inlet pressure of the cargo oil pump to be tested is adjusted through the vacuum valve 24 and the vacuum pump 22, the vacuum pump 22 is firstly turned on, and then the vacuum valve 24 is turned on, so that the vacuum pump 22 can adjust the inlet pressure of the cargo oil pump to be tested; when it is desired to stop the pressure regulation, the vacuum valve 24 is closed and then the vacuum pump 22 is closed.
Optionally, the testing device further comprises a third stop valve 6, and a port of the third stop valve 6 is respectively communicated with the second water inlet of the steady flow tank 11 and the second water inlet of the cavitation tank 21.
In the above implementation manner, the other end of the third stop valve 6 is communicated with a water source, and the water can be supplemented to the flow stabilizing tank 11 and the cavitation tank 21 by opening and closing the third stop valve 6.
Alternatively, the water source may be a pump station or the like. The third shut-off valve 6 may be a solenoid valve, and the third shut-off valve 6 is electrically connected to the calculation control module 5, so that the third shut-off valve 6 can be remotely operated by the calculation control module 5. In other embodiments, the third shut-off valve 6 may also be a manual shut-off valve, locally controlled by the operator, to ensure the reliability of the third shut-off valve 6.
The embodiment of the invention provides a method for testing the performance of a cargo oil pump, which is suitable for a testing device shown in fig. 1, and fig. 2 is a flow chart of the testing method, and the testing method comprises the following steps:
step 101: the height difference of the water outlet of the cargo oil pump to be detected relative to the water inlet of the cargo oil pump to be detected, the water outlet pressure of the cargo oil pump to be detected, the water inlet pressure of the cargo oil pump to be detected, the water outlet flow of the cargo oil pump to be detected, the water inlet sectional area of the cargo oil pump to be detected and the water outlet sectional area of the cargo oil pump to be detected are obtained.
During concrete implementation, the height difference of the water outlet of the cargo oil pump to be tested relative to the water inlet of the cargo oil pump to be tested can be obtained through actual measurement, the water outlet pressure of the cargo oil pump to be tested can be obtained through outlet pressure measuring pipe measurement, the water inlet pressure of the cargo oil pump to be tested can be obtained through inlet pressure measuring pipe measurement, the water outlet flow of the cargo oil pump to be tested can be obtained through flowmeter measurement, and the water inlet cross-sectional area of the cargo oil pump to be tested and the water outlet cross-sectional area of the cargo oil.
Step 102: and calculating to obtain the lift of the cargo oil pump to be detected according to the height difference of the water outlet of the cargo oil pump to be detected relative to the lift datum plane, the water outlet pressure of the cargo oil pump to be detected, the water inlet pressure of the cargo oil pump to be detected, the water outlet flow of the cargo oil pump to be detected, the water inlet sectional area of the cargo oil pump to be detected and the water outlet sectional area of the cargo oil pump to be detected.
Specifically, the lift of the cargo oil pump to be measured is calculated by the following formula:
in formula (1), H is the lift of the cargo oil pump to be measured, ZdFor the height of the outlet of the cargo oil pump to be measured, ZsFor the height of the water inlet of the cargo oil pump to be measured, PdFor the outlet pressure, P, of the cargo oil pump to be measuredsIs the water inlet pressure of the cargo oil pump to be measured, Q is the water outlet flow of the cargo oil pump to be measured, SdIs the sectional area of the water outlet of the cargo oil pump to be measured SsThe cross section of a water inlet of the cargo oil pump to be detected, rho is the density of liquid in the cargo oil pump to be detected, and g is the gravity acceleration.
In the implementation manner, the testing device obtains the data, and then the lifting height of the cargo oil pump to be tested is calculated by the calculation control module by using the formula (1).
Step 103: and (3) adjusting the flow of the water outlet of the cargo oil pump to be measured to obtain a flow lift curve chart (see figure 3).
In the concrete implementation, the rated flow of the cargo oil pump to be measured is gradually increased from 0% to 120%, 13 measurement points are taken in steps with the rated flow of the cargo oil pump to be measured being 0% as an initial value, for example, the measurement point is the first measurement point when the flow of the water outlet of the cargo oil pump to be measured is 0% of the rated flow, the measurement point is the second measurement point when the flow of the water outlet of the cargo oil pump to be measured is 10% of the rated flow, … …, and the measurement point is the thirteenth measurement point when the flow of the water outlet of the cargo oil pump to be measured is 120% of the rated flow. And (3) calculating the lift corresponding to each measuring point through a formula (1) to obtain a flow lift curve graph.
Step 104: and acquiring the rotating speed of the cargo oil pump to be detected and the torque of the cargo oil pump to be detected.
During specific implementation, the rotating speed of the cargo oil pump to be tested and the torque of the cargo oil pump to be tested can be measured through the torque meter.
Step 105: calculating to obtain the output power of the cargo oil pump to be detected according to the flow of the water outlet of the cargo oil pump to be detected and the lift of the cargo oil pump to be detected, and calculating to obtain the shaft power of the cargo oil pump to be detected according to the rotating speed of the cargo oil pump to be detected and the torque of the cargo oil pump to be detected.
Specifically, the output power of the cargo oil pump to be tested and the shaft power of the cargo oil pump to be tested are calculated by the following formula:
in the formulae (2) and (3), P1For the output power of the cargo oil pump to be measured, P2The shaft power of the cargo oil pump to be tested, n is the rotating speed of the cargo oil pump to be tested, T is the torque of the cargo oil pump to be tested, and η is the efficiency of the cargo oil pump to be tested.
In the implementation manner, the testing device obtains the data, and then the output power of the cargo oil pump to be tested and the shaft power of the cargo oil pump to be tested are respectively calculated by the calculation control module by using the formulas (2) and (3).
Step 106: and calculating the efficiency of the cargo oil pump to be detected according to the output power of the cargo oil pump to be detected and the shaft power of the cargo oil pump to be detected.
Specifically, the efficiency of the cargo oil pump to be tested is calculated by the following formula:
in equation (4), η is the efficiency of the cargo pump under test.
In the implementation manner, the testing device obtains the data, and then the efficiency of the cargo oil pump to be tested is calculated by the calculation control module by using the formula (4).
Step 107: and adjusting the flow of the water outlet of the cargo oil pump to be measured to obtain a flow efficiency curve chart (see figure 3).
In the above implementation manner, the adjustment manner of the flow rate of the water outlet of the cargo oil pump to be measured and the selection of the measurement point are the same as those in step 103, and are not described herein again.
Step 108: and acquiring the height difference of the water inlet of the cargo oil pump to be detected relative to the cavitation allowance reference surface.
In the above implementation manner, the cavitation allowance reference surface is an impeller center surface of the cargo oil pump to be measured, and a height difference of a water inlet of the cargo oil pump to be measured relative to the cavitation allowance reference surface can be obtained through actual measurement
Step 109: and calculating to obtain the effective cavitation allowance of the cargo oil pump to be detected according to the height difference of the water inlet of the cargo oil pump to be detected relative to the cavitation allowance reference surface and the pressure of the water outlet of the cargo oil pump to be detected.
Specifically, the effective cavitation allowance of the cargo oil pump to be measured is calculated by the following formula:
in the formula (5), NPSHaIs the effective cavitation margin, P, of the cargo oil pump to be measuredaAt atmospheric pressure, PvPressure required for vaporizing the liquid, ZdIs the height difference of the water inlet of the cargo oil pump to be measured relative to the cavitation allowance reference surface.
Step 110: and adjusting the pressure of the water outlet of the cargo oil pump to be measured to obtain a cavitation allowance curve graph (see figure 4).
In the implementation mode, the cargo oil pump to be tested is started firstly, the pressure of the water outlet of the cargo oil pump to be tested is adjusted to be rated flow through the flow adjusting valve, then the vacuum valve and the vacuum pump are started, the pressure of the water inlet of the cargo oil pump to be tested is gradually reduced, the effective cavitation allowance of the cargo oil pump to be tested is calculated through the formula (5) in the secondary process until the lift of the cargo oil pump to be tested is reduced by 3% on the basis of the initial lift, the vacuum valve is closed, and the vacuum pump stops working.
Step 111: and obtaining a performance test result of the cargo oil pump to be tested according to the flow lift curve graph, the flow efficiency curve graph and the cavitation margin curve graph.
It should be noted that fig. 3 is a graph of a cargo oil pump performance test, which includes a flow head graph, a flow efficiency graph and a flow shaft power graph.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The device for testing the performance of the cargo oil pump is characterized by comprising a flow module, a cavitation module, a pressure module, a torque meter and a calculation control module,
the flow module comprises a flow stabilizing tank, a flow regulating valve and a flowmeter, a first water inlet of the flow stabilizing tank is communicated with a water outlet of the flow regulating valve, a water inlet of the flow regulating valve is used for being communicated with a water outlet of a cargo oil pump to be tested, and the flowmeter is arranged on a pipeline between the flow regulating valve and the cargo oil pump to be tested;
the cavitation module comprises a cavitation tank and a vacuum pump, a water outlet of the cavitation tank is communicated with a water inlet of the cargo oil pump to be tested, a first water inlet of the cavitation tank is communicated with a water outlet of the flow stabilizing tank, and an air inlet of the vacuum pump is respectively communicated with vacuum interfaces of the flow stabilizing tank and the cavitation tank;
the pressure module comprises an inlet pressure measuring pipe and an outlet pressure measuring pipe, the inlet pressure measuring pipe is arranged at a water inlet of the cargo oil pump to be detected, and the outlet pressure measuring pipe is arranged at a water outlet of the cargo oil pump to be detected;
the torque meter is connected with a rotating shaft of the cargo oil pump to be tested;
the calculation control module is respectively electrically connected with the flowmeter, the inlet pressure measuring pipe, the outlet pressure measuring pipe and the torquemeter, and is used for calculating to obtain a performance curve chart of the cargo oil pump to be measured according to data measured by the flowmeter, the inlet pressure measuring pipe, the outlet pressure measuring pipe and the torquemeter.
2. The testing device of claim 1, wherein the flow module further comprises a first shut-off valve disposed at a first water inlet of the ballast tank.
3. The testing device of claim 1, wherein the cavitation module further comprises a second shut-off valve disposed at a water outlet of the cavitation canister.
4. The testing device of claim 1, wherein the cavitation module further comprises a vacuum valve disposed at an inlet of the vacuum pump.
5. The testing device of claim 1, further comprising a third shut-off valve having a port in communication with the second water inlet of the flow-stabilizing tank and the second water inlet of the cavitation tank, respectively.
6. A method for testing the performance of a cargo oil pump, wherein the method is applied to the testing device of claim 1, and the method comprises the following steps:
acquiring the height difference of a water outlet of the cargo oil pump to be detected relative to a water inlet of the cargo oil pump to be detected, the pressure of the water outlet of the cargo oil pump to be detected, the pressure of the water inlet of the cargo oil pump to be detected, the flow of the water outlet of the cargo oil pump to be detected, the cross-sectional area of the water inlet of the cargo oil pump to be detected and the cross-sectional area of the water outlet of the cargo oil pump to be;
calculating to obtain the lift of the cargo oil pump to be detected according to the height difference of the water outlet of the cargo oil pump to be detected relative to a lift datum plane, the water outlet pressure of the cargo oil pump to be detected, the water inlet pressure of the cargo oil pump to be detected, the water outlet flow of the cargo oil pump to be detected, the water inlet cross-sectional area of the cargo oil pump to be detected and the water outlet cross-sectional area of the cargo oil pump to be detected;
the lift of the cargo oil pump to be tested is calculated by the following formula:
wherein H is the lift of the cargo oil pump to be tested, ZdIs the height of the water outlet of the cargo oil pump to be measured, ZsIs the height of the water inlet of the cargo oil pump to be tested, PdIs the outlet pressure, P, of the cargo oil pump to be measuredsIs the pressure of the water inlet of the cargo oil pump to be tested, Q is the flow of the water outlet of the cargo oil pump to be tested, SdIs the cross section area, S, of the water outlet of the cargo oil pump to be testedsThe cross section of a water inlet of the cargo oil pump to be detected is shown, rho is the density of liquid in the cargo oil pump to be detected, and g is the gravity acceleration;
adjusting the flow of a water outlet of the cargo oil pump to be detected to obtain a flow lift curve chart;
acquiring the rotating speed of the cargo oil pump to be tested and the torque of the cargo oil pump to be tested;
calculating to obtain the output power of the cargo oil pump to be detected according to the flow of a water outlet of the cargo oil pump to be detected and the lift of the cargo oil pump to be detected, and calculating to obtain the shaft power of the cargo oil pump to be detected according to the rotating speed of the cargo oil pump to be detected and the torque of the cargo oil pump to be detected;
calculating the efficiency of the cargo oil pump to be detected according to the output power of the cargo oil pump to be detected and the shaft power of the cargo oil pump to be detected;
the efficiency of the cargo oil pump to be tested is calculated by the following formula:
wherein, P1Is the output power, P, of the cargo oil pump to be measured2The shaft power of the cargo oil pump to be detected is shown, n is the rotating speed of the cargo oil pump to be detected, T is the torque of the cargo oil pump to be detected, and η is the efficiency of the cargo oil pump to be detected;
adjusting the flow of a water outlet of the cargo oil pump to be detected to obtain a flow efficiency curve chart;
acquiring the height difference of a water inlet of the cargo oil pump to be detected relative to a cavitation allowance reference surface;
calculating to obtain the effective cavitation allowance of the cargo oil pump to be detected according to the height difference of the water inlet of the cargo oil pump to be detected relative to the cavitation allowance reference surface and the pressure of the water outlet of the cargo oil pump to be detected;
the effective cavitation allowance of the cargo oil pump to be measured is calculated by the following formula:
wherein, NPSHaIs the effective cavitation margin, P, of the cargo oil pump to be testedaAt atmospheric pressure, PvPressure required for vaporizing said liquid, ZdThe height difference of the water inlet of the cargo oil pump to be detected relative to the cavitation allowance reference surface;
adjusting the pressure of a water inlet of the cargo oil pump to be detected to obtain a cavitation allowance curve graph;
and obtaining a performance test result of the cargo oil pump to be tested according to the flow lift curve chart, the flow efficiency curve chart and the cavitation allowance curve chart.
7. The method as claimed in claim 6, wherein said adjusting the pressure at the outlet of the cargo oil pump to be tested comprises:
and gradually increasing the rated flow of the cargo oil pump to be tested from 0% to 120%.
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| CA2724786C (en) * | 2008-05-20 | 2017-08-22 | Cidra Corporate Services, Inc. | Applications of pump performance monitoring |
| CN101694212B (en) * | 2009-10-21 | 2012-07-25 | 中国农业大学 | Pump and pump station integrated tester |
| CN102901650B (en) * | 2012-10-16 | 2015-12-09 | 武汉船用机械有限责任公司 | A kind of proving installation of cargo oil system and method |
| RU2604463C1 (en) * | 2015-11-17 | 2016-12-10 | Закрытое акционерное общество "РИМЕРА" | Method of submersible oil pumps gas separators testing and test bench to implement this method |
| CN106762709B (en) * | 2016-12-13 | 2018-07-27 | 合肥工业大学 | A kind of micro- lift vertical axial-flow pump lift measuring device and measuring method |
| CN106968934B (en) * | 2017-04-26 | 2018-12-18 | 广东肯富来泵业股份有限公司 | Pump cavitation surplus Auto-Test System and its method |
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