CN117514739A - Oil pump fault detection device and method - Google Patents
Oil pump fault detection device and method Download PDFInfo
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- CN117514739A CN117514739A CN202311501763.XA CN202311501763A CN117514739A CN 117514739 A CN117514739 A CN 117514739A CN 202311501763 A CN202311501763 A CN 202311501763A CN 117514739 A CN117514739 A CN 117514739A
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- 238000001514 detection method Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000003921 oil Substances 0.000 claims abstract description 201
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 88
- 238000004364 calculation method Methods 0.000 claims abstract description 9
- 238000012937 correction Methods 0.000 claims description 15
- 238000012886 linear function Methods 0.000 claims description 2
- 238000011056 performance test Methods 0.000 abstract 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses an oil pump fault detection device and method, and relates to an oil pump performance test device and method. The purpose is in order to overcome present steam turbine operation in-process, can't carry out the real-time supervision to the operating condition of oil pump and judge the problem that whether oil pump can normally work, and the device includes: the oil pump outlet flow acquisition device is used for acquiring the unit volume of the hydraulic oil in the unit time of the oil pump; the oil pump inlet temperature acquisition device is used for acquiring the temperature of hydraulic oil at the inlet of the oil pump; the oil pump outlet temperature acquisition device is used for acquiring the temperature of hydraulic oil at an oil pump outlet; the oil pump inlet pressure acquisition device is used for acquiring the pressure at the inlet of the oil pump; the oil pump outlet pressure acquisition device is used for acquiring the pressure at the outlet of the oil pump; the oil pump efficiency calculation and comparison unit is used for calculating the actual efficiency of the oil pump; and judging that the oil pump fails when the difference ratio of the actual efficiency and the rated efficiency of the oil pump is more than 10%.
Description
Technical Field
The invention relates to an oil pump performance testing device and method.
Background
The oil pump is a power element of a turbine regulating and protecting system (EH system) and provides power for the whole system. In order to prevent the oil pump from failure in the running process and affecting the normal running of the unit, the EH system is provided with two main oil pumps, one main oil pump is used for one standby, and when the pressure of the system is lower due to a certain reason, the other main oil pump is started through interlocking, so that the two main oil pumps are simultaneously put into operation, and the requirements of the system on the flow and the pressure are met.
However, in the operation process of the steam turbine, the working condition of the oil pump cannot be monitored in real time, and whether the oil pump can work normally can be judged only by overhauling the oil pump during shutdown.
Disclosure of Invention
The invention aims to solve the problem that the working condition of an oil pump cannot be monitored in real time in the running process of the existing steam turbine to judge whether the oil pump can work normally, and provides an oil pump fault detection device and method.
The invention provides an oil pump fault detection device, which comprises an oil pump outlet flow acquisition device, an oil pump inlet temperature acquisition device, an oil pump outlet temperature acquisition device, an oil pump inlet pressure acquisition device, an oil pump outlet pressure acquisition device and an oil pump efficiency calculation comparison unit;
the oil pump outlet flow acquisition device is used for acquiring the unit volume of the hydraulic oil in the unit time of the oil pump;
the oil pump inlet temperature acquisition device is used for acquiring the temperature of hydraulic oil at the inlet of the oil pump;
the oil pump outlet temperature acquisition device is used for acquiring the temperature of hydraulic oil at an oil pump outlet;
the oil pump inlet pressure acquisition device is used for acquiring the pressure at the inlet of the oil pump;
the oil pump outlet pressure acquisition device is used for acquiring the pressure at the outlet of the oil pump;
the oil pump efficiency calculation and comparison unit is used for calculating the actual efficiency of the oil pump according to the unit volume of the hydraulic oil in the unit time of the hydraulic oil, the hydraulic oil temperature at the inlet of the oil pump, the hydraulic oil temperature at the outlet of the oil pump, the pressure at the inlet of the oil pump, the preset specific heat capacity of the hydraulic oil and the preset volume expansion temperature coefficient of the hydraulic oil;
and judging that the oil pump fails when the difference ratio of the actual efficiency and the rated efficiency of the oil pump is more than 10%.
The invention also provides an oil pump fault detection method based on the oil pump fault detection device, which comprises the following specific steps:
collecting and obtaining a unit volume of internal pressure hydraulic oil in unit time, a hydraulic oil temperature at an inlet of an oil pump, a hydraulic oil temperature at an outlet of the oil pump, a pressure at the inlet of the oil pump and a pressure at the outlet of the oil pump;
step two, calculating to obtain the actual efficiency of the oil pump according to the unit volume of the hydraulic oil in the unit time of the hydraulic oil, the temperature of the hydraulic oil at the inlet of the oil pump, the temperature of the hydraulic oil at the outlet of the oil pump, the pressure at the inlet of the oil pump, the pressure at the outlet of the oil pump, the specific heat capacity of the hydraulic oil and the volume expansion temperature coefficient of the hydraulic oil;
step three, judging whether the difference ratio of the actual efficiency to the rated efficiency is more than 10%;
if yes, judging that the oil pump fails;
and if not, judging that the oil pump is normal.
The beneficial effects of the invention are as follows:
the invention provides an oil pump fault detection device and method, which are used for calculating oil pump efficiency based on a thermodynamic detection method, constructing an oil pump efficiency observation model, calculating actual efficiency of an oil pump, judging whether the oil pump works normally or not on line through logic judgment, and pre-judging potential hazards of EH system faults. And the system reliability is improved. And the comprehensive research and judgment can be performed by combining other measuring points of the EH system, the fault diagnosis capability of the system is improved, and the system has certain expansibility.
Drawings
Fig. 1 is a schematic structural diagram of an oil pump fault detection device matched with an oil pump.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
Detailed description of the preferred embodiments
The oil pump fault detection device of the embodiment comprises an oil pump outlet flow acquisition device 1, an oil pump inlet temperature acquisition device 2, an oil pump outlet temperature acquisition device 3, an oil pump inlet pressure acquisition device 4, an oil pump outlet pressure acquisition device 5 and an oil pump efficiency calculation comparison unit;
the oil pump outlet flow acquisition device 1 is used for acquiring the unit volume of the internal pressure hydraulic oil in unit time of the oil pump 7;
the oil pump inlet temperature acquisition device 2 is used for acquiring the temperature of hydraulic oil at an oil pump inlet;
the oil pump outlet temperature acquisition device 3 is used for acquiring the temperature of hydraulic oil at an oil pump outlet;
the oil pump inlet pressure acquisition device 4 is used for acquiring the pressure at the inlet of the oil pump;
the oil pump outlet pressure acquisition device 5 is used for acquiring the pressure at the outlet of the oil pump;
the oil pump efficiency calculation and comparison unit is used for calculating the actual efficiency of the oil pump 7 according to the unit volume of the hydraulic oil in the unit time of the hydraulic oil, the hydraulic oil temperature at the inlet of the oil pump, the hydraulic oil temperature at the outlet of the oil pump, the pressure at the inlet of the oil pump, the preset specific heat capacity of the hydraulic oil and the preset volume expansion temperature coefficient of the hydraulic oil;
and judges that the oil pump 7 is malfunctioning when the difference ratio of the actual efficiency to the rated efficiency of the oil pump is greater than 10%.
Specifically, as shown in fig. 1, corresponding pressure, flow and other measuring points are arranged on the pump set, and corresponding parameters are measured.
Substituting the obtained actual efficiency of the oil pump into a judgment logic to judge whether the oil pump can work normally or not:
when the difference ratio of the actual efficiency and the rated efficiency of the oil pump is reduced within 10%, the oil pump can work normally;
when the difference ratio of the actual efficiency and the rated efficiency of the oil pump is reduced by more than 10%, the system feeds back an oil pump alarm signal;
when the difference ratio of the actual efficiency and the rated efficiency of the oil pump is reduced by more than 15%, starting a standby oil pump of the unit and feeding back an oil pump alarm signal;
when the system fails, whether the oil pump fails or not can be checked by checking whether the power of the oil pump is abnormal, and when the oil pump descending efficiency is within 10%, the oil pump is judged to be failure-free.
Detailed description of the preferred embodiments
The present embodiment is further described with respect to the first embodiment, and further includes an oil pump overflow pipe temperature acquisition device 6;
the oil pump overflow pipe temperature acquisition device 6 is used for acquiring the temperature of hydraulic oil in an overflow pipe of the oil pump 7;
the oil pump efficiency calculation comparison unit is also used for calculating an overflow correction coefficient according to the temperature of the hydraulic oil in the overflow pipe; and the actual efficiency is corrected by the overflow correction coefficient to obtain corrected actual efficiency.
Other technical features of this embodiment are exactly the same as those of the first embodiment.
Specifically, for a variable pump, the efficiency is affected by an overflow pipe, a temperature sensor is placed on the overflow pipe of the oil pump, the temperature of hydraulic oil in the overflow pipe is measured, the overflow correction coefficient lambda of the system oil pressure between 10MPa and 20MPa is defined as a linear relation between the hydraulic oil temperature in the overflow pipe, and lambda=f (T'). The actual efficiency is corrected by the overflow correction coefficient.
Detailed description of the preferred embodiments
The oil pump fault detection method according to the present embodiment is based on the second embodiment, and specifically includes the following steps:
collecting and obtaining a unit volume of internal pressure hydraulic oil in unit time, a hydraulic oil temperature at an inlet of an oil pump, a hydraulic oil temperature at an outlet of the oil pump, a pressure at the inlet of the oil pump and a pressure at the outlet of the oil pump;
step two, calculating to obtain the actual efficiency of the oil pump according to the unit volume of the hydraulic oil in the unit time of the hydraulic oil, the temperature of the hydraulic oil at the inlet of the oil pump, the temperature of the hydraulic oil at the outlet of the oil pump, the pressure at the inlet of the oil pump, the pressure at the outlet of the oil pump, the specific heat capacity of the hydraulic oil and the volume expansion temperature coefficient of the hydraulic oil;
step three, judging whether the difference ratio of the actual efficiency to the rated efficiency is more than 10%;
if yes, judging that the oil pump fails;
and if not, judging that the oil pump is normal.
Other technical features of the present embodiment are exactly the same as those of the second embodiment.
Detailed description of the preferred embodiments
This embodiment is a further description of the third embodiment, which,
the first step further comprises the step of collecting the temperature of hydraulic oil in the overflow pipe;
step two, calculating to obtain an overflow correction coefficient according to the temperature of the hydraulic oil in the overflow pipe; and the actual efficiency is corrected by the overflow correction coefficient to obtain corrected actual efficiency.
Other technical features of the present embodiment are exactly the same as those of the third embodiment.
Detailed description of the preferred embodiments
In this embodiment, the actual efficiency of the oil pump is calculated by the following formula:
η pump with a pump body ＝v 2 Δp*[C p ΔT H +(1-αT 2 )v 2 Δp]
Wherein v is 2 The unit volume of the hydraulic oil is pressed in the unit time of the oil pump; c (C) p Is the specific heat capacity of the hydraulic oil; delta T H The hydraulic oil temperature difference at the inlet and the outlet of the oil pump is obtained by subtracting the hydraulic oil temperature at the inlet of the oil pump from the hydraulic oil temperature at the outlet of the oil pump; alpha is the volume expansion temperature coefficient of hydraulic oil; Δp is the pressure difference in the oil pump, obtained by subtracting the pressure at the inlet of the oil pump from the pressure at the outlet of the oil pump; t (T) 2 Is the hydraulic oil temperature at the outlet of the oil pump.
Other technical features of the present embodiment are exactly the same as those of the fourth embodiment.
Specifically, in this embodiment, an oil pump efficiency observation model is built based on a thermodynamic detection method.
The thermodynamic detection method is one of the common fault detection methods of hydraulic equipment, and when the hydraulic system is in the working condition of balanced input and output, the sum of the input energy and the output energy of any component part in the system is equal to zero. The dynamic balance equation of the hydraulic oil pump is as follows:
considering that the EH system is a position controlled servo system, it does not take the output energy as the main target, and therefore the utilization of the energy carried by the output medium is not the most relevant target of the system. The overall system efficiency is thus calculated as the input and output power of the hydraulic oil pump package. Considering that the flow of the oil pump, the pressure difference in the oil pump and the temperature difference are all related to the oil pump efficiency, the dynamic balance equation of the hydraulic oil pump is simplified, and the oil pump efficiency solving formula can be obtained:
detailed description of the preferred embodiments six
In this embodiment, in the second step, the overflow correction coefficient is calculated by the following formula:
λ＝f(T′)
wherein f (·) is a linear function of the overflow correction coefficient λ and the hydraulic oil temperature T' in the overflow pipe;
and obtaining the corrected actual efficiency by the following formula:
η′ pump with a pump body ＝(1-λ)η Pump with a pump body 。
Other technical features of the present embodiment are exactly the same as those of the fourth or fifth embodiment.
Specifically, for a variable pump, the efficiency is affected by an overflow pipe, a temperature sensor is placed on the overflow pipe of the oil pump, the temperature is measured to be T ', the linear relation between an overflow correction coefficient lambda and the temperature T ' of the oil pressure of the system between 10MPa and 20MPa is defined, and lambda=f (T ') is defined, so that the efficiency of the hydraulic oil pump can be corrected as follows: η' Pump with a pump body ＝(1-λ)η Pump with a pump body ＝[1-f(T')]η Pump with a pump body In eta Oil pump ' is the corrected efficiency of the hydraulic oil pump.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the different dependent claims and the features herein may be combined in ways other than as described in the original claims. It is also to be understood that features described in connection with separate embodiments may be used in other embodiments.
Claims (6)
1. The oil pump fault detection device is characterized by comprising an oil pump outlet flow acquisition device (1), an oil pump inlet temperature acquisition device (2), an oil pump outlet temperature acquisition device (3), an oil pump inlet pressure acquisition device (4), an oil pump outlet pressure acquisition device (5) and an oil pump efficiency calculation comparison unit;
the oil pump outlet flow collection device (1) is used for collecting the unit volume of the hydraulic oil in unit time of the oil pump (7);
the oil pump inlet temperature acquisition device (2) is used for acquiring the temperature of hydraulic oil at an oil pump inlet;
the oil pump outlet temperature acquisition device (3) is used for acquiring the temperature of hydraulic oil at an oil pump outlet;
the oil pump inlet pressure acquisition device (4) is used for acquiring the pressure at the inlet of the oil pump;
the oil pump outlet pressure acquisition device (5) is used for acquiring the pressure at the outlet of the oil pump;
the oil pump efficiency calculation and comparison unit is used for calculating the actual efficiency of the oil pump (7) according to the unit volume of the hydraulic oil in the unit time of the hydraulic oil, the hydraulic oil temperature at the inlet of the oil pump, the hydraulic oil temperature at the outlet of the oil pump, the pressure at the inlet of the oil pump, the preset specific heat capacity of the hydraulic oil and the preset volume expansion temperature coefficient of the hydraulic oil;
and when the difference ratio of the actual efficiency and the rated efficiency of the oil pump is more than 10%, judging that the oil pump (7) fails.
2. The oil pump fault detection device according to claim 1, further comprising an oil pump overflow pipe temperature acquisition device (6);
the oil pump overflow pipe temperature acquisition device (6) is used for acquiring the temperature of hydraulic oil in an overflow pipe of the oil pump (7);
the oil pump efficiency calculation comparison unit is also used for calculating an overflow correction coefficient according to the temperature of the hydraulic oil in the overflow pipe; and the actual efficiency is corrected by the overflow correction coefficient to obtain corrected actual efficiency.
3. An oil pump fault detection method based on the oil pump fault detection device as claimed in claim 2, characterized by comprising the following specific steps:
collecting and obtaining a unit volume of internal pressure hydraulic oil in unit time, a hydraulic oil temperature at an inlet of an oil pump, a hydraulic oil temperature at an outlet of the oil pump, a pressure at the inlet of the oil pump and a pressure at the outlet of the oil pump;
step two, calculating to obtain the actual efficiency of the oil pump according to the unit volume of the hydraulic oil in the unit time of the hydraulic oil, the temperature of the hydraulic oil at the inlet of the oil pump, the temperature of the hydraulic oil at the outlet of the oil pump, the pressure at the inlet of the oil pump, the pressure at the outlet of the oil pump, the specific heat capacity of the hydraulic oil and the volume expansion temperature coefficient of the hydraulic oil;
step three, judging whether the difference ratio of the actual efficiency to the rated efficiency is more than 10%;
if yes, judging that the oil pump fails;
and if not, judging that the oil pump is normal.
4. A method for detecting a failure of an oil pump according to claim 3, wherein,
the first step further comprises the step of collecting the temperature of hydraulic oil in the overflow pipe;
step two, calculating to obtain an overflow correction coefficient according to the temperature of the hydraulic oil in the overflow pipe; and the actual efficiency is corrected by the overflow correction coefficient to obtain corrected actual efficiency.
5. The method for detecting a failure of an oil pump according to claim 4, wherein in the second step, the actual efficiency of the oil pump is calculated by the following formula:
η pump with a pump body ＝v 2 Δp/[C p ΔT H +(1-αT 2 )v 2 Δp]
Wherein v is 2 The unit volume of the hydraulic oil is pressed in the unit time of the oil pump; c (C) p Is the specific heat capacity of the hydraulic oil; delta T H The hydraulic oil temperature at the inlet of the oil pump is subtracted from the hydraulic oil temperature at the outlet of the oil pump to obtain the hydraulic oil temperature difference at the inlet of the oil pumpObtaining the degree; alpha is the volume expansion temperature coefficient of hydraulic oil; Δp is the pressure difference in the oil pump, obtained by subtracting the pressure at the inlet of the oil pump from the pressure at the outlet of the oil pump; t (T) 2 Is the hydraulic oil temperature at the outlet of the oil pump.
6. The oil pump failure detection method according to claim 4 or 5, wherein in the second step, the overflow correction coefficient is calculated by the following formula:
λ＝f(T′)
wherein f (·) is a linear function of the overflow correction coefficient λ and the hydraulic oil temperature T' in the overflow pipe;
and obtaining the corrected actual efficiency by the following formula:
η′ pump with a pump body ＝(1-λ)η Pump with a pump body 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311501763.XA CN117514739A (en) | 2023-11-10 | 2023-11-10 | Oil pump fault detection device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311501763.XA CN117514739A (en) | 2023-11-10 | 2023-11-10 | Oil pump fault detection device and method |
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| CN117514739A true CN117514739A (en) | 2024-02-06 |
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| CN202311501763.XA Pending CN117514739A (en) | 2023-11-10 | 2023-11-10 | Oil pump fault detection device and method |
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| CN (1) | CN117514739A (en) |
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- 2023-11-10 CN CN202311501763.XA patent/CN117514739A/en active Pending
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