CN104266805A - Detection device and detection method for detecting air tightness of air-tight door of nuclear power plant by using constant pressure method - Google Patents
Detection device and detection method for detecting air tightness of air-tight door of nuclear power plant by using constant pressure method Download PDFInfo
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- CN104266805A CN104266805A CN201410586190.XA CN201410586190A CN104266805A CN 104266805 A CN104266805 A CN 104266805A CN 201410586190 A CN201410586190 A CN 201410586190A CN 104266805 A CN104266805 A CN 104266805A
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Abstract
The invention discloses a detection device for detecting air tightness of an air-tight door of a nuclear power plant by using a constant pressure method. The detection device comprises an air tightness testing box body and a testing system, wherein a testing opening is formed in the air tightness testing box body; a tested part is arranged on the testing opening; the testing system comprises a digital adjuster; a flexible sealing glue ring is cast between the testing opening and the tested part; an air inflation cavity is defined by a sealing ring, the testing opening, the tested part and the sealing glue ring jointly; the digital adjuster is used for adjusting the opening of a pneumatic adjusting valve and the opening of an inflation control valve according to the air pressure tested by a pressure transmitter to enable the air pressure inside the air tightness testing box body to be equal to the designed pressure intensity of the tested part and enable the air pressure inside the air inflation cavity to be approximate to that inside the air tightness testing box body. The detection device has the advantages that the structure is simple, the use is convenient, the automation degree is high, the air tightness of the tested part can be calculated quantitatively, and the leakage of non-testing gases is reduced.
Description
Technical field
The present invention relates to the technical field that gas-tight door detects, particularly relate to the bubble-tight detection of nuclear power station gas-tight door, specifically, is that a kind of constant-voltage method detects the bubble-tight pick-up unit of nuclear power station gas-tight door and detection method thereof.
Background technology
For ensureing the normal operation of nuclear power station unit, China all needs just can come into operation through strictly detecting to the impermeability of gas-tight door at the nuclear power station built at present, but the nuclear power station that early stage builds, its supporting gas-tight door carries out all abroad by its corresponding tightness test of external import, for the nuclear power air tight door tightness test project domesticized, the air-tightness of gas-tight door is checked whether to meet nuclear power designing requirement, the air tightness tester technology matched with it or blank, and the temporary nothing of domestic inspection body of authorizing through country is at present suitable for the device of gas-tight door air-tight test, therefore the test unit being badly in need of a kind of gas-tight door and the experimental technique matched with this test unit.
Present external existing gas-tight door experimental provision, the detection method adopted is filled with the gas identical or slightly high with designing pressure in test casing, then wait for the Leakage Gas speed in observation test casing and leakage rate, finally draw the gas sealing ability of test specimen.But, this detection method is inaccurate: As time goes on the gaseous tension being filled with test casing can reduce gradually, can not test, therefore under a fixing pressure to the sealing of gas-tight door, its sealing of test specimen can only be drawn perceptually, cannot calculate quantitatively.
In addition, except the gas leakage situation of test specimen, also there is gas leak phenomenon in the junction between test specimen and pick-up unit, the degree of accuracy that impact is measured.
Summary of the invention
Technical matters to be solved by this invention is for the above-mentioned state of the art, and provides that a kind of structure is simple, easy to use, automaticity is high, quantitatively can calculate the gas tightness of test specimen, reduces the constant-voltage method of the Leakage Gas of non-test and detect the bubble-tight pick-up unit of nuclear power station gas-tight door and detection method thereof.
The present invention solves the problems of the technologies described above adopted technical scheme:
Constant-voltage method detects the bubble-tight pick-up unit of nuclear power station gas-tight door, comprise air tightness test casing, test macro, air tightness test casing offers test opening, test specimen is placed on test opening, wherein: test macro includes digital governer, pressure-air air supply plant and casing state monitoring apparatus, pressure-air air supply plant comprises air compressor, air compressor is communicated with air tightness test casing by the first pipeline, first pipeline is connected with pneumatic control valve and mass-flow gas meter in turn, mass-flow gas meter is combined with the flow integrator that can add up gas flow, soft sealing ring is built between test opening and test specimen, the outer ring surface of sealing ring glues together with test opening and is integrated part, the inner ring surface of sealing ring and test specimen glue together and are integrated part, the outside of sealing ring is formed with sealing ring, the outer ring surface of sealing ring seals fixing with test opening, sealing ring inner ring surface and test specimen seal fixing, sealing ring, test opening, test specimen and sealing ring are encircled into inflatable chamber jointly, air compressor is communicated with inflatable chamber by second pipe, second pipe is connected with pressurising operation valve, casing state monitoring apparatus includes pressure unit, pressure unit is connected with air tightness test casing and inflatable chamber and measures the air pressure in air tightness test casing and inflatable chamber, pressure unit, pneumatic control valve and pressurising operation valve are all connected with digital governer signal, it is equal that the air pressure adjustment aperture of pneumatic control valve that digital governer records according to pressure unit and the aperture of pressurising operation valve make the air pressure in air tightness test casing and test specimen design pressure, and the air pressure in inflatable chamber is close with the air pressure in air tightness test casing.
For optimizing technique scheme, the concrete measure taked also comprises:
The aperture device of above-mentioned pneumatic control valve is connected with the first conduit pipe pneumatically, and pneumatic control valve carries out on-off action with the high pressure gas source of being used as power flowing through pneumatic control valve aperture device.
Above-mentioned pressure-air air supply plant includes gas buffer tank, and gas buffer tank is arranged on the first pipeline between air compressor and pneumatic control valve.
Above-mentioned pressure-air air supply plant includes filtering type reduction valve, and filtering type reduction valve is arranged on the first pipeline on the first pipeline between air compressor and surge tank 42 and between surge tank 42 and pneumatic control valve.
Above-mentioned air tightness test casing is provided with the U-shaped meter that can demonstrate air tightness test casing internal gas pressure.
The first pipeline between above-mentioned air compressor, gas buffer tank, filtering type reduction valve is provided with valve, the first pipeline between mass-flow gas meter and air tightness test casing is provided with valve.
One detects bubble-tight method as claim constant-voltage method detects the bubble-tight pick-up unit of nuclear power station gas-tight door, comprises the following steps:
Step one, test specimen is placed in test opening part, then to the junction glue spraying of test specimen and test opening, waits for colloid solidification after spraying, carry out secondary and mend glue, form sealing ring, guarantee that test specimen and test opening are formed sealing by colloid;
Step 2, outside sealing ring, sealing ring is installed, second pipe is entered sealing ring, test opening, test specimen and sealing ring are encircled in inflatable chamber jointly; After confirming that each valve and circuit are in closed condition, open air compressor, open each valve, connect each appliance circuit;
Step 3, input predetermined force value by digital governer, the digital governer adjustment aperture of pneumatic control valve and the aperture of pressurising operation valve, pressure in air tightness test casing is changed to predetermined force value, pressure in inflatable chamber and impermeability test the Simultaneous Pressure change in casing, make the air pressure of sealing ring both sides in a basic balance;
Step 4, when the pressure in air tightness test casing tends towards stability through all after dates of several concussion about predetermined force value, start the leakage rate measuring air tightness test casing, flow integrator counts; First pipeline to continue in air tightness test casing the constant pressure that leakage rate that inflation compensates impermeability test casing makes in air tightness test casing;
Step 5, read the data of flow integrator after a predetermined time afterwards, calculate the leakage rate of having installed the air tightness test casing of test specimen, and then determine whether test specimen sealing meets the demands.
When the pressure in air tightness test casing starts through three all after dates of concussion the leakage rate measuring air tightness test casing about predetermined force value in step 4.
The Calculational Methods on Leakage of having installed the air tightness test casing of test specimen in step 5 is as follows:
=
-
In formula:
: the leakage rate of having installed the air tightness test casing of test specimen;
: do not install test specimen, air tightness test casing is closed, the Additional leakage amount of the test pressure lower device measured;
: after test specimen is installed, the air leak amount of air tightness test casing under the test pressure measured.
The schedule time in step 5 is 1 hour.
Compared with prior art, the present invention forms closed-loop control system by pressure unit, digital governer, pneumatic control valve.PID control system is adopted to control the aperture of pneumatic control valve, adjust air inflow, make the force value that the pressure stability of air tightness test casing is preset to test, the compressed-air actuated instantaneous delivery value flowing into air tightness test casing is measured, by flowing into the compressed-air actuated cumulative amount of test casing in flow integrator display regulation test period by mass-flow gas meter.
Pressure-air air supply plant is formed, by filtering type reduction valve, for system provides stable source of the gas primarily of air compressor, gas reservoir.
Pressure unit is used for measuring the force value in air tightness test casing, and pressure signal is converted to electric signal, and size of current is 4mA to 20mA, sends digital governer to.
Digital governer receives the force value of pressure unit, and the preset pressure value of user's input carries out PID arithmetic, and result is passed to pneumatic control valve.
Pneumatic control valve take pressurized air as power source, receives the electric signal of digital governer, and adjustment spool aperture, controls air inflow.
Mass-flow gas meter be used for measure flow into test casing instantaneous delivery, time real data send flow accumulator to.
Flow accumulator is used for showing the integrated flux flowing into test casing.
The present invention adopts PID control system, and digital governer carries out Real-time Collection and the process of data, reduces tester and artificial calculated amount.The rational judgment of leakage rate can be carried out by flow accumulator, but not qualitatively judge.Test with " constant-voltage method " replacement " pressure decline method ", can test under any force value in test specification.Measurement result is more accurate and laminating is actual.Measure the quality of leakage air, carry out the comparison of leakage rate size, avoiding air because of factors such as pressure, temperature, humidity affects test value.
A feature of the present invention is the air tightness test casing air leakage that greatly can reduce non-test place.When test specimen is arranged on air tightness test casing, not only test specimen itself has certain leakage rate, test specimen and air tightness test casing junction have certain gas leakage situation, cause measuring and forbidden, and the present invention adopts being filled with the gas with equal pressure in air tightness test casing in inflatable chamber, makes external pressure in sealing place close, greatly can improve the situation of the Leakage Gas of non-test, what the present invention adopted is flexible glue sealing, concretely, is glass cement.
The present invention has structure is simple, easy to use, automaticity is high, quantitatively can calculate test specimen gas tightness, reduces the advantage of the Leakage Gas of non-test.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention,
Fig. 2 is the A portion schematic enlarged-scale view of Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in further detail.
Fig. 1 is to Figure 2 shows that structural representation of the present invention.
Reference numeral is wherein: air tightness test casing 1, U-shaped meter 11, test macro 2, digital governer 3, pressure-air air supply plant 4, first pipeline 4a, second pipe 4b, air compressor 41, gas buffer tank 42, pneumatic control valve 43, mass-flow gas meter 44, flow integrator 45, filtering type reduction valve 46, casing state monitoring apparatus 5, pressure unit 51, test specimen 6, sealing ring 7, inflatable chamber 71, pressurising operation valve 72, sealing ring 8.
As shown in Figure 1 to Figure 2,
Constant-voltage method detects the bubble-tight pick-up unit of nuclear power station gas-tight door, comprise air tightness test casing 1, test macro 2, air tightness test casing 1 offers test opening, test specimen 6 is placed on test opening, wherein: test macro 2 includes digital governer 3, pressure-air air supply plant 4 and casing state monitoring apparatus 5, pressure-air air supply plant 4 comprises air compressor 41, air compressor 41 is communicated with air tightness test casing 1 by the first pipeline 4a, first pipeline 4a is connected with pneumatic control valve 43 and mass-flow gas meter 44 in turn, mass-flow gas meter 44 is combined with the flow integrator 45 that can add up gas flow, soft sealing ring 7 is built between test opening and test specimen 6, the outer ring surface of sealing ring 7 glues together with test opening and is integrated part, the inner ring surface of sealing ring 7 and test specimen 6 glue together and are integrated part, the outside of sealing ring 7 is formed with sealing ring 8, the outer ring surface of sealing ring 8 seals fixing with test opening, sealing ring 8 inner ring surface and test specimen 6 seal fixing, sealing ring 8, test opening, test specimen 6 and sealing ring 7 are encircled into inflatable chamber 71 jointly, air compressor 41 is communicated with inflatable chamber 71 by second pipe 4b, second pipe 4b is connected with pressurising operation valve 72, casing state monitoring apparatus 5 includes pressure unit 51, pressure unit 51 is connected with air tightness test casing 1 and inflatable chamber 71 and measures the air pressure in air tightness test casing 1 and inflatable chamber 71, pressure unit 51, pneumatic control valve 43 and pressurising operation valve 72 are all connected with digital governer 3 signal, it is equal that the air pressure adjustment aperture of pneumatic control valve 43 that digital governer 3 records according to pressure unit 51 and the aperture of pressurising operation valve 72 make the air pressure in air tightness test casing 1 and test specimen 6 design pressure, and the air pressure in inflatable chamber 71 is close with the air pressure in air tightness test casing 1.
The aperture device of pneumatic control valve 43 is connected with the first pipeline 4a is pneumatic, and pneumatic control valve 43 carries out on-off action with the high pressure gas source of being used as power flowing through pneumatic control valve 43 aperture device.
Pressure-air air supply plant 4 includes gas buffer tank 42, and gas buffer tank 42 is arranged on the first pipeline 4a between air compressor 41 and pneumatic control valve 43.
Pressure-air air supply plant 4 includes filtering type reduction valve 46, and filtering type reduction valve 46 is arranged on the first pipeline 4a on the first pipeline 4a between air compressor 41 and surge tank 42 and between surge tank 42 and pneumatic control valve 43.
Air tightness test casing 1 is provided with the U-shaped meter 11 that can demonstrate air tightness test casing 1 internal gas pressure.
The first pipeline 4a between air compressor 41, gas buffer tank 42, filtering type reduction valve 46 is provided with valve, the first pipeline 4a between mass-flow gas meter 44 and air tightness test casing 1 is provided with valve.
Connect all gas and circuit-line by the mode of Fig. 1, check that whether each connection is correct.In Fig. 1, solid line represents connecting line, and arrow represents gas flow, represented by dotted arrows instrument signal line, and the solid line adding oblique stroke is pneumatic singal line.
Test specimen 6 is placed in test opening part, then glass cement is sprayed to the junction of test specimen 6 and test opening, after spraying, wait for colloid solidification, carry out secondary and mend glue, form sealing ring 7, guarantee that colloid is by test specimen 6 and test opening formation sealing; Sealing ring 8 is installed outside sealing ring 7, second pipe 4b is entered sealing ring 8, test opening, test specimen 6 and sealing ring 7 are encircled in inflatable chamber 71 jointly; After connecting, check and confirm that each valve and circuit are in closed condition.
Open air compressor, after work 10s, open each valve, connect the circuit of each instrument.
When carrying out the air-leakage test of gas-tight door, the force value of test specimen door, is undertaken inputting (as: 1000pa, 2000pa, 3000pa by digital governer 3 ...).Digital governer 3 adjusts the aperture of pneumatic control valve 43 and the aperture of pressurising operation valve 72, pressure in air tightness test casing 1 is changed to predetermined force value, pressure in inflatable chamber 71 and impermeability test the Simultaneous Pressure change in casing 1, make the air pressure of sealing ring 7 both sides in a basic balance;
The change of force value is checked by the display of digital governer 3 dial plate and the reading of U-shaped meter 11, when the force value of setting is after about 3 periodic vibrations, force value is in stable, starts reading, is calculated the leakage rate of 1h by the semi-invariant on flow integrator 45 dial plate.
Detect data processing
The leakage rate of sample gate under test pressure can by formulae discovery below:
=
-
In formula:
---do not install test specimen door, test casing is closed, the Additional leakage amount of the test pressure lower device measured;
---after installation test sample gate, the air leak amount of the test pressure lower device measured.
Judge whether door leakage rate meets the demands according to measurement result.
Below be only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, should be considered as protection scope of the present invention.
Claims (10)
1. constant-voltage method detects the bubble-tight pick-up unit of nuclear power station gas-tight door, comprise air tightness test casing (1), test macro (2), described air tightness test casing (1) offers test opening, test specimen (6) is placed on test opening, it is characterized in that: described test macro (2) includes digital governer (3), pressure-air air supply plant (4) and casing state monitoring apparatus (5), described pressure-air air supply plant (4) comprises air compressor (41), described air compressor (41) is communicated with air tightness test casing (1) by the first pipeline (4a), described the first pipeline (4a) is connected with pneumatic control valve (43) and mass-flow gas meter (44) in turn, described mass-flow gas meter (44) is combined with the flow integrator (45) that can add up gas flow, soft sealing ring (7) is built between described test opening and test specimen (6), the outer ring surface of described sealing ring (7) glues together with test opening and is integrated part, the inner ring surface of described sealing ring (7) and test specimen (6) glue together and are integrated part, the outside of described sealing ring (7) is formed with sealing ring (8), the outer ring surface of described sealing ring (8) seals fixing with test opening, described sealing ring (8) inner ring surface and test specimen (6) seal fixing, described sealing ring (8), test opening, test specimen (6) and sealing ring (7) are encircled into inflatable chamber (71) jointly, described air compressor (41) is communicated with inflatable chamber (71) by second pipe (4b), described second pipe (4b) is connected with pressurising operation valve (72), described casing state monitoring apparatus (5) includes pressure unit (51), described pressure unit (51) is connected with air tightness test casing (1) and inflatable chamber (71) and measures the air pressure in air tightness test casing (1) and inflatable chamber (71), described pressure unit (51), pneumatic control valve (43) and pressurising operation valve (72) are all connected with digital governer (3) signal, it is equal that the aperture of air pressure adjustment pneumatic control valve (43) that described digital governer (3) records according to pressure unit (51) and the aperture of pressurising operation valve (72) make the air pressure in air tightness test casing (1) and test specimen (6) design pressure, and the air pressure in inflatable chamber (71) is close with the air pressure in air tightness test casing (1).
2. constant-voltage method according to claim 1 detects the bubble-tight pick-up unit of nuclear power station gas-tight door, it is characterized in that: the aperture device of described pneumatic control valve (43) is connected with the first pipeline (4a) is pneumatic, and described pneumatic control valve (43) carries out on-off action with the high pressure gas source of being used as power flowing through pneumatic control valve (43) aperture device.
3. constant-voltage method according to claim 2 detects the bubble-tight pick-up unit of nuclear power station gas-tight door, it is characterized in that: described pressure-air air supply plant (4) includes gas buffer tank (42), described gas buffer tank (42) is arranged on the first pipeline (4a) between air compressor (41) and pneumatic control valve (43).
4. constant-voltage method according to claim 3 detects the bubble-tight pick-up unit of nuclear power station gas-tight door, it is characterized in that: described pressure-air air supply plant (4) includes filtering type reduction valve (46), described filtering type reduction valve (46) is arranged on the first pipeline (4a) on the first pipeline (4a) between air compressor (41) and surge tank (42) and between surge tank (42) and pneumatic control valve (43).
5. constant-voltage method according to claim 4 detects the bubble-tight pick-up unit of nuclear power station gas-tight door, it is characterized in that: described air tightness test casing (1) is provided with the U-shaped meter (11) that can demonstrate air tightness test casing (1) internal gas pressure.
6. constant-voltage method according to claim 5 detects the bubble-tight pick-up unit of nuclear power station gas-tight door, it is characterized in that: the first pipeline (4a) between described air compressor (41), gas buffer tank (42), filtering type reduction valve (46) is provided with valve, the first pipeline (4a) between described mass-flow gas meter (44) and air tightness test casing (1) is provided with valve.
7. constant-voltage method as claimed in claim 6 detects the bubble-tight pick-up unit of nuclear power station gas-tight door and detects a bubble-tight method, it is characterized in that: comprise the following steps:
Step one, test specimen (6) is placed in test opening part, then to test specimen (6) and the junction glue spraying of testing opening, colloid solidification is waited for after spraying, carry out secondary and mend glue, form sealing ring (7), guarantee that test specimen (6) and test opening are formed sealing by colloid;
Step 2, installation sealing ring (8) outside sealing ring (7), enter sealing ring (8), test opening, test specimen (6) and sealing ring (7) be encircled in inflatable chamber (71) jointly by second pipe (4b); After confirming that each valve and circuit are in closed condition, open air compressor, open each valve, connect each appliance circuit;
Step 3, input predetermined force value by digital governer (3), the aperture of digital governer (3) adjustment pneumatic control valve (43) and the aperture of pressurising operation valve (72), pressure in air tightness test casing (1) is changed to predetermined force value, pressure in inflatable chamber (71) and impermeability test the Simultaneous Pressure change in casing (1), make the air pressure of sealing ring (7) both sides in a basic balance;
Step 4, to tend towards stability through all after dates of several concussion about predetermined force value when the pressure in air tightness test casing (1), start the leakage rate measuring air tightness test casing (1), flow integrator (45) counts; The leakage rate that first pipeline (4a) continues to compensate impermeability test casing (1) to the interior inflation of air tightness test casing (1) makes the constant pressure in air tightness test casing (1);
Step 5, read the data of flow integrator (45) after a predetermined time afterwards, the leakage rate of the air tightness test casing (1) of test specimen (6) has been installed in calculating, and then determines whether test specimen (6) sealing meets the demands.
8. constant-voltage method according to claim 7 detects the bubble-tight method of nuclear power station gas-tight door, it is characterized in that: when the pressure in air tightness test casing (1) starts to measure the leakage rate of air tightness test casing (1) about predetermined force value through three all after dates of concussion in described step 4.
9. constant-voltage method according to claim 7 detects the bubble-tight method of nuclear power station gas-tight door, it is characterized in that: the Calculational Methods on Leakage of having installed the air tightness test casing (1) of test specimen (6) in described step 5 is as follows:
=
-
In formula:
: the leakage rate of having installed the air tightness test casing (1) of test specimen (6);
: do not install test specimen (6), air tightness test casing (1) is closed, the Additional leakage amount of the test pressure lower device measured;
: after test specimen (6) is installed, the air leak amount of air tightness test casing (1) under the test pressure measured.
10. constant-voltage method according to claim 7 detects the bubble-tight method of nuclear power station gas-tight door, it is characterized in that: the schedule time in described step 5 is 1 hour.
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