CN113027800A - Air pump impeller overspeed test platform and test method adopting SF6 gas medium - Google Patents
Air pump impeller overspeed test platform and test method adopting SF6 gas medium Download PDFInfo
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- CN113027800A CN113027800A CN202110296049.6A CN202110296049A CN113027800A CN 113027800 A CN113027800 A CN 113027800A CN 202110296049 A CN202110296049 A CN 202110296049A CN 113027800 A CN113027800 A CN 113027800A
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- 238000012360 testing method Methods 0.000 title claims abstract description 109
- 238000010998 test method Methods 0.000 title claims abstract description 12
- 238000007789 sealing Methods 0.000 claims abstract description 37
- 230000000087 stabilizing effect Effects 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract 1
- 230000008569 process Effects 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- 239000000284 extract Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000001603 reducing effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/002—Details, component parts, or accessories especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
Abstract
Aiming at the defects of the prior art, the application designs an air pump impeller overspeed test platform adopting SF6 gas medium, which comprises an air storage tank, an inflow pipeline, an outflow pipeline, an air pump, a vacuum pump and an impeller, wherein the air storage tank, the inflow pipeline, the air pump and the outflow pipeline are sequentially connected to form a closed circulation space for SF6 gas to flow, a sealing valve is arranged between the air pump and the inflow pipeline and between the outflow pipelines, the impeller is installed in the air pump, and the vacuum pump is connected to the space in the air pump. The closed test platform for the overspeed test of the air pump impeller by taking SF6 gas as a medium provides a test device for realizing the closed test of the impeller under SF6 gas, has good test result output capacity, can ensure good test results by being matched with the test method of the test platform provided by the invention, and can effectively save the test cost and time.
Description
Technical Field
The invention relates to the technical field of overspeed tests of air pump impellers, and particularly provides an air pump impeller overspeed test platform adopting SF6 gas medium and a test method for carrying out an air pump impeller overspeed test by using the platform.
Background
The impeller is used as the heart part of the air pump, the strength of the impeller plays a decisive role in the service life of the air pump, particularly, after a new air pump is developed, the impeller needs to be subjected to a strength test in order to ensure the safe and reliable operation of the air pump, and at present, a test bed for an overspeed test of the impeller of the air pump in a special gas (such as SF6) environment in the field with more special working conditions such as chemical engineering and the like does not exist, and if the air pump is tested by using an open test bed, the requirement of simulating a real use environment cannot be met. The obtained experimental data do not have guiding significance for the actual production and use conditions.
Therefore, how to provide an air pump impeller overspeed test device using SF6 gas as a medium and a test method matched with the same are technical problems to be solved by the application.
Disclosure of Invention
To prior art's weak point this application has designed an air pump impeller overspeed test platform who adopts SF6 gaseous medium, and this test platform is the test platform of closed, including gas holder, influent stream pipeline, the pipeline of effluenting, air pump, vacuum pump and impeller, gas holder, influent stream pipeline, air pump, the pipeline of effluenting connect gradually and form the closed circulation space that supplies SF6 gas flow, air pump and influent stream pipeline, the pipeline of effluenting are equipped with the seal valve between, install impeller in the air pump, vacuum pump connection to air pump inner space.
Therefore, the test platform provides a closed circulation space for the impeller to run in the high-purity SF6 gas atmosphere, so that a real use environment can be effectively simulated, and the test result of the air pump impeller has a better guiding effect in actual production and use. Through the arrangement of the sealing valve structure, in the process of replacing and disassembling the air pump and the impeller, the local sealing of the closed circulation space can be realized through the opening and closing of the sealing valve, namely, the sealing valve isolates the whole test platform into one part consisting of the air storage tank, the inflow pipeline and the outflow pipeline and the other part consisting of the air pump, namely, after the sealing valve is closed, the air pump is disassembled and assembled, so that most SF6 in the test platform cannot be subjected to air leakage, extra steps of air recovery and the like are not needed in the test process, and the test cost and time are greatly saved.
As a further preferable technical scheme of the present invention, the inflow pipeline includes an inflow straight pipe and an inflow pressure-measuring pipe which are sequentially and hermetically connected from the gas storage tank to the gas pump, the inflow pressure-measuring pipe is provided with an inflow pressure transmitter, and the tail end of the inflow pressure-measuring pipe is provided with the sealing valve.
Therefore, air feeding flow to the air pump is provided through the inflow pipeline extending out of the air storage tank, the inflow straight pipe enables air flow to be stable laminar flow, turbulent flow influencing pressure monitoring and impeller work cannot be generated, and the inflow pressure transmitter is used for detecting air pressure of the air pump and the inflow section of the impeller.
As a further preferable technical scheme of the present invention, the outflow pipeline includes an outflow pressure-measuring pipe, a flowmeter inlet pipe, a flowmeter outlet pipe, and a ball valve, the outflow pressure-measuring pipe is provided with an outflow pressure transmitter, and the front end of the outflow pressure-measuring pipe is provided with the sealing valve.
Therefore, the gas which flows out from the air pump is received and sent back to the air storage tank through the outflow pipeline, and circulation flowing to the air pump again is formed, wherein the flow meter, the inlet pipe and the outlet pipe of the flow meter which are matched with the flow meter are used for stabilizing the air flow and measuring the gas flow passing through the flow meter, the outflow pressure transmitter is used for detecting the gas pressure of the outflow section of the air pump and the impeller, and the ball valve is used for adjusting the gas flow flowing to the air storage tank, namely adjusting the gas flow in the whole closed circulation space after the whole test platform starts to operate.
As a further preferable technical scheme of the invention, a bent pipe with 90-degree axial lines at two ends is arranged between the outflow piezometer pipe and the inlet pipe of the flowmeter.
Therefore, through the pipeline structure design of the bent pipe, the whole pipeline structure forms a stable circulation path which flows back to the air storage tank, and the 90-degree bending mode of the pipeline structure reduces the pressure loss of airflow flowing in the pipeline. The bent pipe in the invention is a long-radius bent pipe (R is more than 90 degrees), and compared with a bent pipe with a shorter radius, the bent pipe has a structure which causes less resistance when the air flow passes through.
As a further preferable technical scheme of the invention, a temperature adjusting component and a thermometer are arranged in the gas storage tank.
Therefore, the temperature adjusting assembly is used for adjusting the temperature of SF6 gas, the temperature of the gas is stable during testing through controllable temperature rising or reducing actions under thermometer detection, and reliability and stability of test operation results are guaranteed.
As a further preferable technical scheme of the invention, at least one flow stabilizing grid is arranged in the gas storage tank.
Therefore, the flow stabilizing grid passes through the grid structure on the flow stabilizing grid, so that the flow state of the air flow which influences the test result due to the vortex, turbulence and the like generated by the change of the shape and the area of the through-flow section in the process of returning the air flow from the outflow pipeline to the air storage tank after the air flow passes through the grid structure on the surface of the flow stabilizing grid is eliminated.
As a further preferable technical solution of the present invention, the present invention further includes a draft tube connected between at least one of the sealing valves and the air pump, and the draft tube is connected to a pipeline of the vacuum pump.
Therefore, the through flow pipe is used for connecting the vacuum pump and is positioned between the two sealing valves, namely the through flow pipe and the air pump are combined to form a structure outside the sealed area of the sealing valve when the impeller and the air pump are assembled and disassembled, so that the vacuum pump can perform the operation of vacuumizing the integrally sealed flow space from the through flow pipe when the sealing valve is opened in the integral operation process, and only SF6 gas in the air pump and the through flow pipe is pumped out from the through flow pipe after the sealing valve is closed before the air pump is replaced, thereby avoiding leakage pollution. Set up the draught tube and make whole test platform connect the opening and the connection structure of vacuum pump be located the draught tube, guarantee the overall structure intensity of air pump itself, provide good experimental effect.
The invention also provides a test method of the gas pump impeller overspeed test platform adopting SF6 gas medium, and the test is carried out by using the closed test platform for the gas pump impeller overspeed test adopting SF6 gas as the medium in the technical scheme, and the test method comprises the following steps:
s1: measuring and recording parameters of the impeller through a three-coordinate measuring instrument, and installing the impeller into the air pump;
s2: after the closed circulation space is vacuumized by the vacuum pump, the vacuum pump is closed, and SF6 gas is injected into the closed circulation space from the gas storage tank until the pressure reaches the rated pressure;
s3: heating or cooling SF6 gas to rated working temperature;
s4: starting the impeller to operate;
s5: and stopping the machine after the impeller runs for a rated time, detaching the impeller, and measuring and recording the parameters of the impeller again through the three-coordinate measuring instrument.
Therefore, a good environment which is wholly filled with SF6 gas is provided on the test platform, the test condition which is basically the same as the real use environment is realized, and the accurate size change of the impeller after the overspeed work is obtained through three-coordinate measurement of the impeller twice before and after, so that the test result which has guiding significance for the actual use and production is obtained.
As a further preferable aspect of the present invention, in S5, after the impeller is stopped for the rated operating time, the method further includes: and closing the two sealing valves, vacuumizing the air pump by the vacuum pump, and then detaching the impeller.
Therefore, the air pump and the impeller can be replaced to test only by pumping the air out of the range of the air pump, the test convenience and the economy are good, and the cost and the test time are effectively reduced.
As a further preferred embodiment of the present invention, S4 comprises the following steps:
s41: starting the impeller at a preset frequency, then adjusting the SF6 gas flow in the closed circulation space to a rated flow, and returning the pressure in the closed circulation space to the rated pressure;
s42: and adjusting the operating frequency of the impeller to overspeed so that the flow in the closed circulation space is greater than the rated flow to a preset test flow, and stably working at the flow for a preset working time.
Therefore, the adjustment of the flow conditions in the closed flow space is realized through S41, so that the whole flow state is still kept in a determined stable test environment under the action of extra air flow generated in the working process of the impeller, and the test result is not influenced; and further performing a test step meeting the test requirements after obtaining the stable test environment of S41 through S42.
In conclusion, the invention has the following beneficial effects:
the closed test platform for the overspeed test of the air pump impeller by taking SF6 gas as a medium provides a test device for realizing the closed test of the impeller under SF6 gas, has good test result output capacity, can ensure good test results by being matched with the test method of the test platform provided by the invention, and can effectively save the test cost and time.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
in the figure, 1-an air storage tank, 11-a temperature regulating assembly, 12-a thermometer, 13-a flow stabilizing grid, 2-an inflow pipeline, 21-an inflow straight pipe, 22-an inflow pressure measuring pipe, 23-an inflow pressure transmitter, 3-an outflow pipeline, 31-an outflow pressure measuring pipe, 32-a flowmeter inlet pipe, 33-a flowmeter, 34-a flowmeter outlet pipe, 35-a ball valve, 36-an outflow pressure transmitter, 37-a bent pipe, 4-an air pump, 41-an impeller, 5-a vacuum pump, 6-a sealing valve, 7-a through flow pipe and 8-SF6 gas cylinders.
Detailed Description
The invention will be further explained by means of specific embodiments with reference to the drawings.
Fig. 1 shows an air pump impeller overspeed test platform using SF6 gas medium, which is a closed test platform and includes an air storage tank 1, an inflow pipeline 2, an outflow pipeline 3, an air pump 4, a vacuum pump 5 and an impeller 41, wherein the air storage tank 1, the inflow pipeline 2, the air pump 4 and the outflow pipeline 3 are sequentially connected to form a closed circulation space for SF6 gas to flow, a sealing valve 6 is arranged between the air pump 4 and the inflow pipeline 2 and between the outflow pipelines 3, the impeller 41 is installed in the air pump 4, and the vacuum pump 5 is connected to the space in the air pump 4. The test platform provides a closed circulation space for the impeller 41 to run in the high-purity SF6 gas atmosphere, so that a real use environment can be effectively simulated, and the test result of the impeller 41 of the air pump 4 has a better guiding function in actual production and use. Through the arrangement of the structure of the sealing valve 6, in the process of replacing and disassembling the air pump 4 and the impeller 41, the local sealing of the closed circulation space can be realized through the opening and closing of the sealing valve 6, namely, the sealing valve 6 isolates the whole test platform into one part consisting of the air storage tank 1, the inflow pipeline 2 and the outflow pipeline 3 and the other part consisting of the air pump 4, namely, after the sealing valve 6 is closed, the air pump 4 is disassembled and assembled, so that most of SF6 in the test platform cannot leak gas, extra steps such as gas recovery are not needed in the experimental process, and the cost and time of the test are greatly saved. The air tank 1 plays a role in stabilizing the flow state of the circulating air flow, adjusting the temperature, stabilizing the pressure, and the like in this embodiment.
In this embodiment, the inflow pipeline 2 includes an inflow straight pipe 21 and an inflow pressure-measuring pipe 22, which are sequentially and hermetically connected from the gas storage tank 1 to the gas pump 4, the inflow pressure-measuring pipe 22 is provided with an inflow pressure transmitter 23, and the tail end of the inflow pressure-measuring pipe 22 is provided with a sealing valve 6. The air supply flow to the air pump 4 is provided by the inflow pipeline 2 extending out of the air storage tank 1, the inflow straight pipe 21 provides a linear through-flow path to enable the air flow to be in a stable laminar flow, conditions such as pressure monitoring at the inflow piezometer pipe 22 section and turbulent flow of the work of the impeller 41 in the air pump 4 cannot be generated, and the inflow pressure transmitter 23 is used for detecting the air pressure of the air pump 4 and the inflow section of the impeller 41.
In this embodiment, the outflow pipeline 3 includes an outflow pressure-measuring pipe 31, a flowmeter inlet pipe 32, a flowmeter outlet pipe 34 and a ball valve 35, an outflow pressure transmitter 36 is arranged on the outflow pressure-measuring pipe 31, and a sealing valve 6 is arranged at the front end of the outflow pressure-measuring pipe 31. The gas flowing out of the gas pump 4 is received and sent back to the gas storage tank 1 through the outflow pipeline 3, and a circulation flowing to the gas pump 4 again is formed, wherein the flow meter realizes the stabilization of the gas flow passing through the flow meter inlet pipe 32 and the flow meter outlet pipe 34 which are matched with the front side and the rear side of the flow meter inlet pipe, the outflow pressure transmitter 36 is used for detecting the gas pressure of the outflow section of the gas pump 4 and the impeller 41, the ball valve 35 is arranged at the tail end of the integral outflow pipeline 3, the ball valve does not obstruct the measurement parameters in the outflow pipeline 3 and is used for adjusting the flow rate of the gas flowing to the gas storage tank 1, namely the flow rate of the gas flowing in the whole closed flowing space is adjusted after the integral test platform starts to.
The inflow pressure transmitter 23 and the outflow pressure transmitter 36 of the air pump 4 are respectively arranged at a distance of 2DN from the inlet and outlet direction of the air pump 4 (DN is a nominal diameter, which is the same below, i.e., at a distance of 2 times the nominal diameter of the inflow pressure-measuring tube 22 and the outflow pressure-measuring tube 31 in this embodiment). The pressure loss of gas generated in the internal flow channel of the pipeline can be avoided, and the measurement precision is improved.
In this embodiment, a bending pipe 37 with 90 ° axial lines at both ends is disposed between the outflow piezometer 31 and the flowmeter inlet pipe 32. Through the pipeline structural design of the bent pipe 37, the whole pipeline structure forms a stable circulation path which returns to the air storage tank 1, the 90-degree bending mode of the pipeline structure reduces the pressure loss of the air flow flowing in the pipeline, the pressure error in the whole closed circulation space is also reduced, and the accuracy of the corresponding test environmental parameters and the test results is realized.
In this embodiment, a temperature adjustment assembly 11 and a thermometer 12 are disposed in the air storage tank 1. The temperature adjusting assembly 11 is a heating wire or a refrigerating sheet and other devices and is used for adjusting the temperature of SF6 gas, the temperature of the gas is stable during the test by detecting the temperature rise or temperature reduction action controllable by the thermometer 12, and the reliability and stability of the test operation result are ensured.
In this embodiment, at least one flow stabilizing grid 13 is disposed in the air storage tank 1. The flow stabilizing grid 13 is a plate with a grid on the surface, four sets of flow stabilizing grids 13 are arranged in the embodiment, and the grid structure on the flow stabilizing grids 13 eliminates the flow state of the test result influenced by vortex, turbulence and the like generated by the change of the shape and the area of the through-flow section in the process that the airflow returns to the air storage tank 1 from the outflow pipeline 3 after passing through the grids on the surface of the flow stabilizing grids 13.
In this embodiment, a draft tube 7 is further included, the draft tube 7 being connected between the sealing valve 6 and the air pump 4 at the end of the inlet line 2 in this embodiment, the draft tube 7 being connected to the line of the vacuum pump 5.
Therefore, the draft tube 7 is used for connecting the vacuum pump 5 and is positioned between the two sealing valves 6, namely, the draft tube 7 and the air pump 4 are combined to form a structure outside the sealed area of the sealing valves 6 when the impeller 41 and the air pump 4 are assembled and disassembled, so that in the integral operation process, the vacuum pump 5 can perform the operation of vacuumizing the integral sealed circulation space from the sealing valves 6 when the sealing valves 6 are opened, and the vacuum pump 5 only extracts SF6 gas in the air pump 4 and the draft tube 7 from the sealing valves 6 before the air pump 4 is replaced, thereby avoiding leakage pollution. Set up draught tube 7 and make the opening and the connection structure that vacuum pump 5 was connected to the whole test platform be located draught tube 7, guarantee the overall structure intensity of air pump 4 itself, provide good experimental effect.
In this embodiment, the flow rate of the air pump 4 is 28 cubic meters/min, the pipe diameters at two ends of the air pump are DN300, and the air pump belongs to an air pump with a large pipe diameter and a low flow rate, and in order to better measure the flow rate, the flow meter 33 in this embodiment uses a thermal gas mass flow meter. The minimum flow can be measured to be zero, the resolution ratio is 0.001m/s, the test platform measures the flow by utilizing the heat conduction principle, no movable part is arranged, the vibration influence is neglected, the front and rear straight pipe sections of the flowmeter 33 are required to be lower than that of other flowmeters, the length of the inlet straight pipe 32 of the flowmeter is 10DN, the length of the outlet straight pipe 34 of the flowmeter is 5DN, the test platform has a compact structure, and the whole parts are connected by flanges, so that the risk of air leakage can be reduced compared with the insertion type test platform.
The embodiment also provides a test method of the air pump impeller overspeed test platform adopting SF6 gas medium, which is used for the test of the closed test platform for the air pump impeller overspeed test adopting SF6 gas as the medium, and comprises the following steps:
s1: measuring and recording parameters of the impeller 41 by a three-coordinate measuring instrument, at least measuring the diameter of a wheel cover inlet of the impeller 41, the diameter of an outer edge of the wheel cover and the verticality of an impeller outlet relative to the impeller, and after the measurement is finished, arranging the impeller 41 into the air pump 4 and further installing the impeller on the integral test platform;
s2: the air in the closed circulation space after installation is extracted by a vacuum pump 5, after the air is extracted to be vacuum, the vacuum pump 5 is closed, SF6 gas is injected into the closed circulation space from an external SF6 gas bottle 8 until the air reaches the rated pressure (measured by an inflow pressure transmitter 23 and an outflow pressure transmitter 36);
s3: correspondingly heating or cooling SF6 gas to a rated working condition temperature according to the value measured by the thermometer 12;
s4: starting the impeller 41 to operate;
s5: after the impeller 41 has been operated for the rated time, the operation is stopped, the impeller 41 is removed, and the parameters are measured again by the coordinate measuring machine and recorded in the impeller 41. By comparing the changes of the parameters recorded twice, the operation result of the impeller 41 which is basically equal to the actual working condition can be obtained.
Therefore, a good environment which is entirely filled with SF6 gas is provided on the test platform, the test conditions which are basically the same as the real use environment are realized, and the accurate size change of the impeller 41 after the overspeed operation is obtained through three-coordinate measurement of the impeller 41 twice before and after, so as to obtain the test result which has guiding significance for the practical use and the production.
In this embodiment, in S5, after the shutdown of the impeller 41 for the rated operation time, the method further includes: the two sealing valves 6 are closed, the SF6 gas in the air pump 4 is pumped to vacuum by the vacuum pump 5, and then the air pump 4 and the impeller 41 are detached, and the other part of the whole test platform is sealed by the two sealing valves 6, and the air pump 4 and the impeller 41 are detached from the test platform. The air pump 4 and the impeller 41 can be replaced for testing only by pumping the air out of the range of the air pump 4, so that the testing device has good testing convenience and economy, and the cost and the testing time are effectively reduced. After replacing the new impeller 41 and air pump 4 and reinstalling them on the test platform, firstly, the vacuum pump 5 is used to pump out the air remaining in the air pump 4 during installation, so as to form a vacuum in the air pump 4, and then the sealing valve 6 is reopened, so that the SF6 gas originally sealed in the other part flows into the vacuum space in the air pump 4, the whole internal pressure also becomes lower, and then a small amount of SF6 gas is injected into the space of the air pump 4 (and the draft tube 7) to return to the rated pressure, so that the next test can be continued. Similarly, when a new air pump 4 is installed, before the sealing valve 6 is opened after installation, the air in the air pump 4 needs to be evacuated by the vacuum pump 5, and then SF6 gas needs to be injected.
In this embodiment, S4 further includes the following steps:
s41: the working rotating speed of the impeller 41 is controlled by the frequency modulator to drive the motor and further control the rotating speed, when S4 is started, the impeller 41 is started at a preset frequency, at this time, because of the pressurization acceleration effect of the rotating work of the impeller 41, the gas flow speed and pressure in the whole closed circulation space can be increased, then the SF6 gas flow in the closed circulation space is adjusted to the rated flow through the ball valve 35, and the pressure in the closed circulation space returns to the rated pressure, so that the error is further reduced;
s42: the frequency of the motor is adjusted, i.e. the impeller 41 is driven to run at an overspeed so that the flow rate in the closed flow-through space is greater than the rated flow rate to a preset test flow rate, in this example 1.3 times the rated flow rate (in other preferred embodiments, other values meeting the experimental requirements), and the closed flow-through space is stably operated at the flow rate for a preset operation time, in this example 2h (in other preferred embodiments, other values meeting the experimental requirements).
In this way, in step S41, the flow conditions in the closed flow space are adjusted. Namely, under the action of extra high-speed airflow generated in the overspeed work of the impeller 41, the through-flow state of SF6 gas in a closed flow space in the whole test platform is still kept in a stable test environment, and the test result is not influenced; and further performing a test step meeting the test requirements after obtaining the stable test environment of S41 through S42.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solutions of the present invention may be made by those skilled in the art without departing from the design concept of the present invention, and the technical contents of the present invention are all described in the claims.
Claims (10)
1. The utility model provides an adopt air pump impeller overspeed test platform of SF6 gas medium which characterized in that: including gas holder (1), influent stream pipeline (2), the pipeline of effluenting (3), air pump (4), vacuum pump (5) and impeller (41), gas holder (1), influent stream pipeline (2), air pump (4), the pipeline of effluenting (3) connect gradually and form the closed circulation space that supplies SF6 gas flow, air pump (4) and influent stream pipeline (2), the pipeline of effluenting (3) are equipped with seal valve (6) within a definite time, impeller (41) install in air pump (4), vacuum pump (5) are connected to air pump (4) inner space.
2. The overspeed test platform for the impeller of the gas pump adopting SF6 gas medium as claimed in claim 1, wherein: the inflow pipeline (2) comprises an inflow straight pipe (21) and an inflow pressure-measuring pipe (22) which are sequentially and hermetically connected with the air pump (4) through the air storage tank (1), an inflow pressure transmitter (23) is arranged on the inflow pressure-measuring pipe (22), and the tail end of the inflow pressure-measuring pipe (22) is provided with the sealing valve (6).
3. The overspeed test platform for the impeller of the gas pump adopting SF6 gas medium as claimed in claim 1, wherein: the outflow pipeline (3) comprises an outflow pressure measuring pipe (31), a flowmeter inlet pipe (32), a flowmeter (33), a flowmeter outlet pipe (34) and a ball valve (35), an outflow pressure transmitter (36) is arranged on the outflow pressure measuring pipe (31), and the front end of the outflow pressure measuring pipe (31) is provided with a sealing valve (6).
4. The overspeed test platform for the impeller of the gas pump adopting SF6 gas medium as claimed in claim 3, wherein: and a bent pipe (37) with 90-degree axial lines at two ends is arranged between the outflow piezometer pipe (31) and the inlet pipe (32) of the flowmeter.
5. The overspeed test platform for the impeller of the gas pump adopting SF6 gas medium as claimed in claim 1, wherein: a temperature adjusting component (11) and a thermometer (12) are arranged in the air storage tank (1).
6. The overspeed test platform for the impeller of the gas pump adopting SF6 gas medium as claimed in claim 1, wherein: at least one flow stabilizing grid (13) is arranged in the air storage tank (1).
7. The overspeed test platform for the impeller of the gas pump adopting SF6 gas medium as claimed in claim 1, wherein: the device also comprises a draught tube (7), wherein the draught tube (7) is connected between at least one sealing valve (6) and the air pump (4), and the draught tube (7) is connected to a pipeline of the vacuum pump (5).
8. An air pump impeller overspeed test method adopting SF6 gas medium, which is characterized in that the method is used for testing an air pump impeller overspeed test platform adopting SF6 gas medium according to any one of claims 1 to 7, and comprises the following steps:
s1: measuring and recording parameters of the impeller (41) through a three-coordinate measuring instrument, and installing the impeller (41) into the air pump (4);
s2: after the closed circulation space is vacuumized by the vacuum pump (5), the vacuum pump (5) is closed, and SF6 gas is injected into the closed circulation space from an external SF6 gas bottle (8) until the pressure reaches the rated pressure;
s3: heating or cooling SF6 gas to rated working temperature;
s4: starting the impeller (41) to operate;
s5: and stopping the impeller (41) after the impeller (41) runs for a rated time, detaching the impeller (41), and measuring and recording the parameters of the impeller (41) again by using the three-coordinate measuring instrument.
9. The test method of the overspeed test platform of the impeller of the gas pump using SF6 gas medium as set forth in claim 8, wherein in S5, after the shutdown of the impeller (41) for the rated operation time, the method further comprises: and closing the two sealing valves (6), vacuumizing the air pump (4) by the vacuum pump (5), and then detaching the impeller (41).
10. The test method of the gas pump impeller overspeed test platform adopting SF6 gas medium as set forth in claim 8, wherein said S4 includes the following steps:
s41: starting the impeller (41) at a preset frequency, then adjusting the SF6 gas flow in the closed circulation space to a rated flow, and returning the pressure in the closed circulation space to the rated pressure;
s42: and adjusting the working frequency of the impeller (41) to overspeed so that the flow in the closed circulation space is greater than the rated flow to a preset test flow, and stably working at the flow for a preset working time.
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