阅读说明：本技术 一种离心油泵快速切换的模拟测试系统及其测试方法 (Simulation test system for rapid switching of centrifugal oil pump and test method thereof ) 是由 王秋宝 田国林 郭艳妮 张红日 陈才明 秦俭 薛光耀 于 2019-11-19 设计创作，主要内容包括：本发明公开了一种离心油泵快速切换的模拟测试系统及其测试方法,涉及润滑系统技术领域,旨在解决润滑系统的压力值试验是破坏性的,容易导致机组轴承烧坏的技术问题,其技术方案要点是包括供油模块,供油模块包括交流油泵、备用交流泵、直流危机油泵、冷油器、过滤器和主油箱；交流油泵和备用交流泵连接有出油管道,过滤器连接有出油管路；出油管路连接有负载模拟单元,其包括模拟平台、负载调节阀TH1、回油调节阀TH2和辅油箱；出油管路连接有供油管路,回油调节阀TH2连接有回油管路,回油管路连接于主油箱；供油模块和负载模拟单元上设置有检测单元。达到了模拟机组的工作环境进行模拟得出最低压力值并不会对机组轴承产生破坏的效果。(The invention discloses a simulation test system for fast switching of centrifugal oil pumps and a test method thereof, relates to the technical field of lubricating systems, and aims to solve the technical problem that a pressure value test of a lubricating system is destructive and easily causes unit bearings to burn out; the alternating-current oil pump and the standby alternating-current pump are connected with an oil outlet pipeline, and the filter is connected with an oil outlet pipeline; the oil outlet pipeline is connected with a load simulation unit which comprises a simulation platform, a load regulating valve TH1, an oil return regulating valve TH2 and an auxiliary oil tank; the oil outlet pipeline is connected with an oil supply pipeline, the oil return regulating valve TH2 is connected with an oil return pipeline, and the oil return pipeline is connected with a main oil tank; and the oil supply module and the load simulation unit are provided with detection units. The effect that the lowest pressure value obtained by simulating the working environment of the simulation unit can not damage the unit bearing is achieved.)

1. A simulation test system for fast switching of centrifugal oil pumps comprises an oil supply module (1), wherein the oil supply module (1) comprises an alternating-current oil pump (11), a standby alternating-current pump (12), a direct-current crisis oil pump (13), an oil cooler (14), a filter (15) and a main oil tank (16), the main oil tank (16) is placed on a reference plane (17), and the alternating-current oil pump (11), the standby alternating-current pump (12) and the direct-current crisis oil pump (13) are respectively fixed on the main oil tank (16); the alternating-current oil pump (11) and the standby alternating-current pump (12) are connected with an oil outlet pipeline (111) together, the oil outlet pipeline (111) is connected to an oil cooler (14) through a pipeline, the oil cooler (14) is connected to a filter (15), the filter (15) is connected with an oil outlet pipeline (151), and the direct-current crisis oil pump (13) is connected to the oil outlet pipeline (151); the method is characterized in that: the oil outlet pipeline (151) is connected with a load simulation unit (2), and the load simulation unit (2) comprises a simulation platform (21), a load regulating valve TH1, an oil return regulating valve TH2 and an auxiliary oil tank (22); the oil outlet pipeline (151) is connected with an oil supply pipeline (23), the oil supply pipeline (23) is connected with a load adjusting valve TH1, the load adjusting valve TH1 is arranged on the simulation platform (21), the other end of the load adjusting valve TH1 is connected with an auxiliary oil tank (22), the auxiliary oil tank (22) is connected with an oil return adjusting valve TH2, the oil return adjusting valve TH2 is connected with an oil return pipeline (221), and the oil return pipeline (221) is connected with the main oil tank (16); and the oil supply module (1) and the load simulation unit (2) are provided with a detection unit (3) for detecting oil supply pressure and load pressure.

2. The centrifugal oil pump fast-switching simulation test system according to claim 1, characterized in that: the detection unit (3) comprises:

speed measuring devices RS respectively arranged on the alternating-current oil pump (11), the standby alternating-current pump (12) and the direct-current crisis oil pump (13);

the pressure transmitters PT are respectively arranged on the oil outlet pipeline (111), one end of the oil outlet pipeline (151) close to the oil supply pipeline (23) and one end of the oil supply pipeline (23) close to the load regulating valve TH 1;

three pressure switches PS, two of which are arranged on the oil outlet pipeline (151) and the other of which is arranged at one end of the oil supply pipeline (23) close to the load regulating valve TH 1;

a flow meter FM1 connected between the oil outlet line 151 and the oil supply line 23;

the power cabinet (31) is used for supplying power to the alternating-current oil pump (11), the standby alternating-current pump (12) and the direct-current crisis oil pump (13);

the data acquisition instrument (32) is coupled with the flow meter FM1, the pressure transmitter PT and the speed measuring device RS so as to collect and analyze data; and the PLC control cabinet (33) is coupled with the pressure switch PS and the data acquisition instrument (32) so as to set the pressure value conveniently.

3. The centrifugal oil pump fast-switching simulation test system according to claim 1, characterized in that: the top of the auxiliary oil tank (22) is connected with an emptying valve (222), an overflow pipeline (2221) is connected between the emptying valve (222) and the auxiliary oil tank (22), and the overflow pipeline (2221) is connected to the main oil tank (16).

4. The centrifugal oil pump fast-switching simulation test system according to claim 1, characterized in that: and the connecting point of the oil outlet pipeline (151) and the oil supply pipeline (23) is connected with an oil storage tank (231).

5. The centrifugal oil pump fast-switching simulation test system according to claim 1, characterized in that: the simulation platform (21) bottom is provided with scaffold (24) of being convenient for height-adjusting, the height that highly is higher than main oil tank (16) of simulation platform (21).

6. The centrifugal oil pump fast-switching simulation test system according to claim 5, wherein: and a support platform (211) is fixed on the scaffold (24), and the oil storage tank is placed on the support platform (211).

7. A test method applied to the simulation test system for the rapid switching of the centrifugal oil pump according to any one of the claims 1 to 6, characterized in that: comprises the following steps:

s100, performing a starting test on the alternating-current oil pump (11) to respectively obtain pressure curves of 1PT, 2PT and 3PT when the alternating-current oil pump (11) is started;

s200, performing a shutdown test on the alternating-current oil pump (11), and simultaneously obtaining pressure curves of 1PT, 2PT and 3PT when the alternating-current oil pump (11) is shut down;

s300, determining a logic relation of accident conditions, and calculating delay time required by starting of the standby pump under the accident conditions according to the logic relation;

s400, selecting a pressure curve corresponding to the accident condition for fitting, superposing the pressure curve when the alternating-current oil pump (11) is started and the pressure curve when the alternating-current oil pump (11) is stopped, and delaying the starting time of the alternating-current oil pump (11) by a delay time relative to the stopping time of the alternating-current oil pump (11).

S500, reading an intersection point of the starting curve and the stopping curve, wherein a pressure value at the intersection point is a lowest value of the superposition pressure in the oil pump switching process under the accident condition of the lubricating system; the time of the intersection point is the time of the lowest point of the pressure value in the switching process of the oil pump;

and S600, testing according to a predetermined accident condition by taking the alternating-current oil pump (11) as a main pump and the standby alternating-current pump (12) as an auxiliary pump so as to verify the lowest pressure value.

8. The test method of the simulation test system for the rapid switching of the centrifugal oil pump according to claim 7, characterized in that: the accident condition comprises an electrical interlocking and a pressure interlocking, the standby alternating-current pump (12) is started immediately when the alternating-current oil pump (11) fails, and the standby alternating-current pump (12) is started when the pressure value of the oil supply pipeline (23) is lower than a preset value through the pressure interlocking.

9. The test method of the simulation test system for the rapid switching of the centrifugal oil pump according to claim 7, characterized in that: the step S600 further includes the following substeps:

a100, firstly, building a simulation test system, then adjusting the load value of a load adjusting valve TH1 and starting an alternating-current oil pump (11);

a200, simulating the alternating-current oil pump (11) by adopting a corresponding accident condition, and detecting the pressure of an oil supply pipeline (23) through a detection unit (3);

a300, drawing a pressure change curve to obtain a minimum value of the simulated pressure;

and A400, comparing the simulation pressure lowest value with the superposition pressure lowest value for verification.

10. The test method of the simulation test system for the rapid switching of the centrifugal oil pump according to claim 9, characterized in that: the detection point of the lowest value of the simulated pressure is positioned at one end of the oil supply pipeline (23) close to the load regulating valve TH 1.

Technical Field

The invention relates to the technical field of lubricating systems, in particular to a simulation test system for fast switching of a centrifugal oil pump and a test method thereof.

Background

A lubricating oil system is arranged in a steam turbine of the generator unit, and the main task of the lubricating oil system is to provide qualified lubricating oil for bearings (including a supporting bearing and a thrust bearing), a coupler and a turning gear of the steam turbine generator unit. At present, a lubricating oil system of a large-scale rotating shaft type main machine generally adopts an oil supply mode of 'one-use one-standby alternating current capacitance lubricating oil pump + direct current emergency oil pump'. The oil supply mode simplifies the design of a lubricating oil system, shortens the axial total length of the unit, and puts higher requirements on the starting performance and the fault switching characteristic of the electric oil pump.

Chinese patent with prior publication number CN105545382A discloses a thermal generator set steam turbine lubricating system, including the main pump lubrication unit, the main pump lubrication unit includes: the lubricating device comprises a main pump, an oil ejector, a main pump check valve and an oil cooler which are sequentially connected through oil pipes, wherein one end of the oil cooler is connected with the main pump check valve, and the other end of the oil cooler is communicated with a part to be lubricated through the oil pipes; the thermal power generating set steam turbine lubricating system further comprises an alternating current pump lubricating unit and a direct current pump lubricating unit, compared with the related technology, the alternating current pump lubricating unit is additionally arranged, in the starting and stopping processes of the generating set, when the rotating speed of a main shaft is smaller than 2700 and 2800r/min, the main pump lubricating unit cannot provide enough oil pressure and oil flow, and at the moment, the alternating current pump lubricating unit is started to meet the oil supply requirement of the system. When the main pump lubricating system and the alternating-current pump lubricating unit break down, the direct-current lubricating unit is started, and the outlet of the direct-current pump bypasses the oil cooler, so that the bearing is prevented from being broken and burning the bearing when the oil cooler breaks down, and the running safety and reliability of the unit are improved.

In order to guarantee the normal operation of the unit and prevent the shutdown, the backup oil pump can be quickly started in case of accident when the oil pump is required to be put into use. However, in the process of switching the oil pump, the pressure at the bearing of the unit is reduced and the flow is reduced due to the stop of the oil pump, and at the moment, the bearing of the unit is easily damaged. Therefore, the minimum pressure value in the oil pump switching process needs to be tested to obtain the minimum pressure value as the warning value, but the test in the prior art is destructive, so that the on-site unit bearing is easily burnt out in the testing process, and therefore improvement is needed.

Disclosure of Invention

In view of the disadvantages of the prior art, an object of the present invention is to provide a simulation test system for fast switching of a centrifugal oil pump, which has the advantages of simulating the working environment of a unit to simulate the switching of a backup oil pump and various working states without damaging bearings of the unit.

In order to achieve the purpose, the invention provides the following technical scheme:

a simulation test system for fast switching of centrifugal oil pumps comprises an oil supply module, wherein the oil supply module comprises an alternating-current oil pump, a standby alternating-current pump, a direct-current crisis oil pump, an oil cooler, a filter and a main oil tank, the main oil tank is placed on a reference plane, and the alternating-current oil pump, the standby alternating-current pump and the direct-current crisis oil pump are respectively fixed on the main oil tank; the alternating-current oil pump and the standby alternating-current pump are jointly connected with an oil outlet pipeline, the oil outlet pipeline is connected to an oil cooler through a pipeline, the oil cooler is connected to a filter, the filter is connected with an oil outlet pipeline, and the direct-current crisis oil pump is connected to the oil outlet pipeline; the oil outlet pipeline is connected with a load simulation unit, and the load simulation unit comprises a simulation platform, a load adjusting valve TH1, an oil return adjusting valve TH2 and an auxiliary oil tank; the oil outlet pipeline is connected with an oil supply pipeline, the oil supply pipeline is connected with a load regulating valve TH1, the load regulating valve TH1 is arranged on the simulation platform, the other end of the load regulating valve TH1 is connected with an auxiliary oil tank, the auxiliary oil tank is connected with an oil return regulating valve TH2, the oil return regulating valve TH2 is connected with an oil return pipeline, and the oil return pipeline is connected with a main oil tank; and the oil supply module and the load simulation unit are provided with detection units for detecting oil supply pressure and load pressure.

Through adopting above-mentioned technical scheme, load governing valve TH1 among the load simulation unit adjusts the load pressure of oil supply pipeline and flows back lubricating oil to the main oil tank through returning oil pipe way to the pressure environment of simulation unit bearing department. Because the operating curves of the centrifugal pumps of the same type are the same, a set of simulation system which is the same as the bearing working environment can be established, and the minimum pressure value of the bearing working environment can be simulated in the simulation system. Therefore, on the premise of not influencing the in-place work and safety performance of the unit bearing, various working states of the bearing can be simulated, and a targeted solution can be provided.

Further, the detection unit comprises a speed measuring device RS which is respectively arranged on the alternating-current oil pump, the standby alternating-current pump and the direct-current crisis oil pump;

the pressure transmitters PT are respectively arranged on the oil outlet pipeline, one end of the oil outlet pipeline close to the oil supply pipeline and one end of the oil supply pipeline close to the load regulating valve TH 1;

two of the three pressure switches PS are arranged on the oil outlet pipeline, and the other pressure switch PS is arranged at one end, close to the load regulating valve TH1, of the oil supply pipeline;

a flow meter FM1 connected between the oil outlet pipe and the oil supply pipe;

the power cabinet is used for supplying power to the alternating-current oil pump, the standby alternating-current pump and the direct-current crisis oil pump;

the data acquisition instrument is coupled with the flow meter FM1, the pressure transmitter PT and the speed measuring device RS to collect and analyze data; and the PLC control cabinet is coupled to the pressure switch PS and the data acquisition instrument so as to set the pressure value conveniently.

Through adopting above-mentioned technical scheme, monitor the pressure value of pipeline at each pipeline to gather through the data acquisition appearance, and control through power cabinet and PLC switch board, thereby can realize simulating the reappearance to the electrical environment around the unit bearing.

Furthermore, the top of the auxiliary oil tank is connected with a vent valve, an overflow pipeline is connected between the vent valve and the auxiliary oil tank, and the overflow pipeline is connected to the main oil tank.

By adopting the technical scheme, the emptying valve is matched with the overflow pipeline to overflow when the lubricating oil in the auxiliary oil tank is too much and the oil return pipeline is not enough to completely return, so that another oil outlet pipeline is provided, and the return of the lubricating oil under the fault condition is ensured.

Furthermore, the connecting point of the oil outlet pipeline and the oil supply pipeline is connected with an oil storage tank.

Through adopting above-mentioned technical scheme, the setting up of oil storage tank is convenient for increase an energy storage pipeline in the pipeline to the longer distance of unit bearing department is simulated, thereby plays the effect of energy storage.

Further, the simulation platform bottom is provided with the scaffold frame of being convenient for height-adjusting, the height that highly is higher than the main fuel tank of simulation platform.

Through adopting above-mentioned technical scheme, the setting of scaffold frame is convenient for adjust the position of simulation platform to the unit bearing of simulation co-altitude.

Furthermore, a supporting platform is fixed on the scaffold, and the oil storage tank is placed on the supporting platform.

Through adopting above-mentioned technical scheme, supporting platform fixes and makes supporting platform's the height that highly is higher than the main oil tank on the scaffold frame to make the height that highly is higher than the main oil tank of assisting the oil tank, lubricating oil is convenient for flow back under the action of gravity.

One objective of the present invention is to provide a testing method for a simulation testing system for fast switching of a centrifugal oil pump, which has the advantages of being capable of measuring and calculating a minimum pressure value and performing simulation verification.

In order to achieve the purpose, the invention provides the following technical scheme: comprises the following steps:

s100, starting the alternating-current oil pump to obtain pressure curves of 1PT, 2PT and 3PT when the alternating-current oil pump is started;

s200, performing a shutdown test on the alternating-current oil pump, and simultaneously obtaining 1PT, 2PT and 3PT pressure curves when the alternating-current oil pump is shutdown;

s300, determining a logic relation of accident conditions, and calculating delay time required by starting of the standby pump under the accident conditions according to the logic relation;

s400, selecting a pressure curve corresponding to an accident condition for fitting, superposing the pressure curve when the alternating-current oil pump is started and the pressure curve when the alternating-current oil pump is stopped, and delaying the starting time of the alternating-current oil pump by a delay time relative to the stopping time of the alternating-current oil pump.

S500, reading an intersection point of the starting curve and the stopping curve, wherein a pressure value at the intersection point is a lowest value of the superposition pressure in the oil pump switching process under the accident condition of the lubricating system; the time of the intersection point is the time of the lowest point of the pressure value in the switching process of the oil pump;

and S600, testing according to a predetermined accident condition by using an alternating-current oil pump as a main pump and a standby alternating-current pump as an auxiliary pump so as to verify the lowest pressure value.

Through adopting above-mentioned technical scheme, measure and draw the curve that alternating-current pump started and shut down, add two curves and superpose after increasing a delay time to can follow the minimum of crossing point reading pressure value, this minimum is as the warning value of a judgement as the reference. The simulation system can simulate the accident condition of the lubrication system and record data, so that the actual lowest value can be measured in the simulation system, and the actual lowest value is compared and verified.

Further, the accident condition comprises an electrical interlock and a pressure interlock, the standby alternating-current pump is started immediately when the alternating-current oil pump fails, and the pressure interlock is started when the pressure value of the oil supply pipeline is lower than a preset value.

By adopting the technical scheme, the accident condition comprises but is not limited to electric interlocking and pressure interlocking, the standby alternating-current pump is quickly started through the response to the accident condition by simulating the accident condition, and the pressure minimum value in the starting process is measured, so that the accident of the unit bearing is simulated, and the test are convenient to carry out.

Further, step S600 further includes the following sub-steps:

a100, firstly, building a simulation test system, then adjusting the load value of a load adjusting valve TH1 and starting an alternating-current oil pump;

a200, simulating the alternating-current oil pump by adopting a corresponding accident condition, and detecting the pressure of an oil supply pipeline through a detection unit;

a300, drawing a pressure change curve to obtain a minimum value of the simulated pressure;

and A400, comparing the simulation pressure lowest value with the superposition pressure lowest value for verification.

By adopting the technical scheme, the simulation test system can simulate and reproduce various accident conditions generated in the lubricating system, and can simulate the accident conditions possibly generated by the unit in advance to prevent in advance on the premise of not influencing the safety of the unit and being in place. In addition, the simulation test system can also reproduce simulation and research a solution according to the curve of the accident condition of the unit, so that the idle stop of the unit bearing is reduced.

Further, the detection point of the simulation pressure lowest value is located at one end of the oil supply pipeline close to the load regulating valve TH 1.

Through adopting above-mentioned technical scheme, the check point setting makes the numerical value of test more laminate in the environment of unit bearing department at the one end that supplies oil pipe way to be close to load control valve TH1 to make the result that reachs more accurate.

In conclusion, the invention has the following beneficial effects:

1. the technology that the load simulation unit and the detection unit are matched is arranged on the oil supply module, so that the effect of simulating the working environment at the bearing of the unit is achieved;

2. the technology that a speed measuring device RS, a pressure transmitter PT, a pressure switch PS, a flowmeter FM1, a power cabinet, a data acquisition instrument and a PLC control cabinet are matched is adopted, so that the effect of collecting and controlling pressure data in the oil pump switching process is achieved;

3. the technology that the emptying valve, the scaffold, the oil storage tank and the supporting platform are matched is arranged at the bottom end of the simulation platform, so that the effect that lubricating oil conveniently flows back into the main oil tank is achieved.

Drawings

FIG. 1 is a schematic diagram of an overall structure of a simulation test system for fast switching of a centrifugal oil pump according to an embodiment;

FIG. 2 is a graph showing a superimposed curve and a simulated graph of pressure interlock switching in the second embodiment;

fig. 3 is a superimposed curve and a simulation graph of the electrical interlock switching in the second embodiment.

In the figure: 1. an oil supply module; 11. an alternating-current oil pump; 111. an oil outlet pipeline; 12. a standby alternating current pump; 13. a direct current crisis oil pump; 14. an oil cooler; 15. a filter; 151. an oil outlet pipeline; 16. a main oil tank; 17. a reference plane; 2. a load simulation unit; 21. a simulation platform; 211. a support platform; 22. an auxiliary oil tank; 221. an oil return line; 222. an atmospheric valve; 2221. an overflow line; 23. an oil supply line; 231. an oil storage tank; 24. a scaffold; 3. a detection unit; 31. a power cabinet; 32. a data acquisition instrument; 33. PLC switch board.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.