CN111323333A - Device for detecting water immersion density of core block - Google Patents
Device for detecting water immersion density of core block Download PDFInfo
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- CN111323333A CN111323333A CN201811543882.0A CN201811543882A CN111323333A CN 111323333 A CN111323333 A CN 111323333A CN 201811543882 A CN201811543882 A CN 201811543882A CN 111323333 A CN111323333 A CN 111323333A
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- vacuum
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- water immersion
- water
- vacuum pump
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 238000007654 immersion Methods 0.000 title claims abstract description 25
- 239000008188 pellet Substances 0.000 claims abstract description 32
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 238000007789 sealing Methods 0.000 claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 238000005553 drilling Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000003801 milling Methods 0.000 claims description 3
- 230000003584 silencer Effects 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 9
- 229910052688 Gadolinium Inorganic materials 0.000 abstract description 8
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 abstract description 8
- 238000013461 design Methods 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000002474 experimental method Methods 0.000 abstract description 2
- 239000000446 fuel Substances 0.000 description 4
- 239000003758 nuclear fuel Substances 0.000 description 2
- OOAWCECZEHPMBX-UHFFFAOYSA-N oxygen(2-);uranium(4+) Chemical compound [O-2].[O-2].[U+4] OOAWCECZEHPMBX-UHFFFAOYSA-N 0.000 description 2
- 239000002574 poison Substances 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- FCTBKIHDJGHPPO-UHFFFAOYSA-N uranium dioxide Inorganic materials O=[U]=O FCTBKIHDJGHPPO-UHFFFAOYSA-N 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
The invention belongs to the technical field of measurement, and particularly relates to a device for detecting the water immersion density of pellets, which comprises a vacuum chamber, a vacuum electromagnetic valve, a vacuum pump, a water inlet valve, an air release valve, a motor and an oil filter, wherein a negative pressure suction port, a water nozzle, a vacuum detection port, a negative pressure suction port, a water nozzle and a vacuum detection port are arranged in the vacuum chamber; a vacuum cover is arranged outside the vacuum chamber, and the lower end of the vacuum cover is hermetically installed with the sealing structure; the water immersion density detection vacuum experiment machine is manufactured and debugged on time according to a design idea, and successfully passes the acceptance of a gadolinium rod working part. The device has the advantages of reasonable structure, convenient operation and reliable sealing performance, realizes the automatic control function of pressure maintaining timing, has the characteristics of high efficiency, low consumption and environmental protection, is put into production at present, runs stably, and completely meets the measurement requirement of the density of the VVER gadolinium-containing pellet.
Description
Technical Field
The invention belongs to the technical field of measurement, and particularly relates to a device for detecting the water immersion density of a core block.
Background
In order to ensure safe and economical operation of the reactor, the nuclear fuel elements must be subjected to strict quality checks, wherein the pellet density is an important quality indicator of the nuclear fuel element manufacturing technology, and it is essential to measure it. The density of the current pellet is generally expressed by two measurement methods of geometric density and impregnation density.
(1) Geometric method: the weight and the size of the core block are measured according to a calculation formula. Because the uranium dioxide compact can generate inevitable deformation after sintering, the size of the sintered compact is difficult to accurately measure by using a common caliper or a digital display micrometer, and the density error of the calculated pellet is large. Geometric methods are therefore often used to measure pellet density after grinding, rather than directly measuring sintered pellet density.
(2) The dipping method comprises the following steps: the density of the agglomerates is determined by immersing the agglomerates in a liquid medium of known density by means of the Archimedes principle and by weighing the mass of the agglomerates in each case. This method does not require direct measurement of the volume of the agglomerates and excludes surface porosity of the agglomerates, so in practice it is a measurement of the true density of the pellets.
Measurement of the density of the VVER gadolinium-containing pellets is carried out according to the requirement of the Russian transfer document of determination of pellet density and open and closed porosity-water immersion method, and before the pellets are immersed in water, vacuum pumping treatment is required to ensure that water is immersed in the pellet pores. Since gadolinium is a neutron poison, to ensure that the uranium dioxide fuel line is not contaminated with this neutron poison, gadolinium containing pellets and fuel rods must be manufactured on a separate isolated neutron absorber fuel rod line. In the preparation stage of VVER-1000 fuel assembly production, the existing pellet density measuring method is only suitable for pellet density on-line control measurement (no vacuum pumping treatment is needed), and pellet water immersion density cannot be measured.
Disclosure of Invention
The invention aims to provide a device for detecting the water immersion density of the pellet, which meets the measurement requirement of VVER gadolinium pellet density, is required by urgent production, improves the detection quantity of samples, avoids the pellet sample from being polluted by oil, and can put the pellet sample after detection into production and use.
The technical scheme of the invention is as follows:
a device for detecting the water immersion density of pellets comprises a vacuum chamber, a vacuum electromagnetic valve, a vacuum pump, a water inlet valve, an air release valve, a motor and an oil filter, wherein a negative pressure suction port, a water nozzle and a vacuum detection port, as well as the negative pressure suction port, the water nozzle and the vacuum detection port, are arranged in the vacuum chamber; a vacuum cover is arranged outside the vacuum chamber, and the lower end of the vacuum cover is hermetically installed with the sealing structure;
the negative pressure suction port extends out of the sealing structure at the lower part of the vacuum chamber, the extending section is divided into two sections, one section is connected with an air release valve, the other section is connected with one end of a vacuum electromagnetic valve through a sleeved joint, the vacuum electromagnetic valve is communicated with a baffle vacuum electromagnetic valve through a metal hose, the baffle vacuum electromagnetic valve is connected with one port of a vacuum pump, the vacuum pump is provided with three ports, and the other two ports are respectively connected with a silencer and oil return device and a motor;
the water nozzle extends out of the sealing structure at the lower part of the vacuum chamber, the extending section is connected to one end of the water inlet valve, the other end of the water inlet valve is provided with a pipeline, and the pipeline is directly inserted into the measuring cup.
The vacuum cover and the lower sealing structure are of a detachable installation structure, and the vacuum cover adopts a self-absorption pre-tightening mode.
In order to prevent the immersion liquid from overflowing in the process of injecting the immersion liquid into the sample tray, the material of the vacuum cover of the vacuum device is selected, the material with visibility is selected to manufacture the vacuum cover, and the operation of the water inlet valve is effectively controlled.
The vacuum cover is made of organic glass.
The vacuum chamber structure comprises a basal disc, an inner flange, an outer flange, a vacuum cover, a rubber pad, a negative pressure suction port, a vacuum detection port and a water nozzle;
the inner cavity at the lower part of the vacuum cover is contacted with the inner flange for axial positioning.
After the vacuum pump is started, the vacuum cover forces the lip edge at the lower part of the vacuum cover to be tightly contacted with the upper surface of the rubber pad under the action of self weight and atmospheric pressure;
the annular air passage formed by the lower surface of the rubber pad and the base plate is communicated with the sealing cavity, and the lower surface of the rubber pad is in close contact with the base plate under the action of atmospheric pressure.
The base plate is made of 33mm thick 1Cr18Ni9Ti stainless steel through one-step clamping, the shape and the plane are machined, and a drilling machine is used for drilling holes and a milling machine is used for discharging air channels.
The vacuum pump is separated from the frame and is connected with the frame by a metal hose.
The vacuum pump is a rotary vane vacuum pump.
The invention has the beneficial effects that:
the water immersion density detection vacuum experiment machine is manufactured and debugged on time according to a design idea, and successfully passes the acceptance of a gadolinium rod working part. The device has the advantages of reasonable structure, convenient operation and reliable sealing performance, realizes the automatic control function of pressure maintaining timing, has the characteristics of high efficiency, low consumption and environmental protection, is put into production at present, runs stably, and completely meets the measurement requirement of the density of the VVER gadolinium-containing pellet.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a vacuum chamber.
In the figure: 1. a vacuum solenoid valve; 2. a vacuum pump; 3. a water inlet valve; 4. a deflation valve; 5. a motor; 6. an oil filter 7 and a negative pressure suction port; 8. a water nozzle; 9. sleeving a connector; 10. a metal hose; 11. a baffle vacuum solenoid valve; 12. a measuring cup; 13. a vacuum detection port; 14. a vacuum hood; 15. an inner flange; 16. an outer flange; 17. a rubber pad; 18. a substrate disk.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
A device for detecting the water immersion density of pellets comprises a vacuum chamber, a vacuum electromagnetic valve 1, a vacuum pump 2, a water inlet valve 3, an air release valve 4, a motor 5 and an oil filter 6. The vacuum chamber is internally provided with a negative pressure suction port 7, a water nozzle 8 and a vacuum detection port 13, and the negative pressure suction port 7, the water nozzle 8 and the vacuum detection port 13; the vacuum cover 14 is arranged outside the vacuum chamber, and the lower end of the vacuum cover 14 is hermetically installed with the sealing structure.
The negative pressure suction port 7 extends out of the sealing structure at the lower part of the vacuum chamber, the extending section is divided into two sections, one section is connected with the air release valve 4, the other section is connected with one end of the vacuum electromagnetic valve 1 through a sleeved joint 9, the vacuum electromagnetic valve 1 is communicated with the baffle vacuum electromagnetic valve 11 through a metal hose 10, the baffle vacuum electromagnetic valve 11 is connected with one port of the vacuum pump 2, the vacuum pump 2 is provided with three ports, and the other two ports are respectively connected with a silencer and oil return device 6 and a motor 5;
the water nozzle 8 extends out of the sealing structure at the lower part of the vacuum chamber, the extending section is connected to one end of the water inlet valve 3, the other end of the water inlet valve 3 is provided with a pipeline, and the pipeline is directly inserted into the measuring cup 12.
The vacuum cover and the lower sealing structure are in detachable installation type structures.
The tray with the pellets is properly placed in the vacuum apparatus and covered with a vacuum hood 14 to provide uniform clearance with the surrounding flanges. And closing the air release valve 4 and the water inlet valve 3, pressing the starting button, starting the vacuum pump 2, opening the vacuum electromagnetic valve 1 at the moment, communicating the vacuum pump 2 with the vacuum device through the vacuum electromagnetic valve 1 and the pipeline, and vacuumizing the sealed volume of the vacuum device. When the vacuum degree reaches the lower limit of the set value, the vacuum solenoid valve 1 (two-position two-way) is powered off (upper part), a channel between the vacuum device and the lower part of the vacuum solenoid valve 1 is cut off, the baffle plate vacuum solenoid valve 11 (two-position three-way) is powered off (lower part), the original vacuum values of the two valves are kept, the vacuum pump 2 is unloaded, and the vacuum pump 2 is stopped; the vacuum device maintains the pressure, and the timer starts to time. When the timer does not reach the set value, the vacuum device is in a pressure maintaining state.
If the vacuum value of the vacuum device is reduced due to leakage and the like, when the vacuum upper limit is set, the system automatically starts to complete the cycle, and the vacuum value is maintained in the interval set by the instrument. And when the timer reaches a set value, the alarm of the electric control system gives an alarm.
In the invention, the vacuum cover 14 of the vacuum device is made of a material, so that the vacuum cover 14 is made of a visible material to prevent the immersion liquid from overflowing in the process of injecting the immersion liquid into the sample tray, and the operation of the water inlet valve is effectively controlled.
The strength of the organic glass is higher, the tensile resistance and the impact resistance are 7-18 times higher than those of common glass, the tensile strength can reach 50-77 MPa, the compressive strength is 130MPa, and the bending strength can reach 90-130 MPa;
the vacuum chamber structure design comprises a base plate 18, an inner flange 15, an outer flange 16, a vacuum cover 14, a rubber pad 17, a negative pressure suction port 7, a vacuum detection port 13 and a water nozzle 8, and the structure is shown in figure 2.
In order to ensure that the vacuum cover is convenient and reliable to seal and convenient to take and place, the vacuum cover 14 adopts a self-suction pre-tightening mode.
The design principle is as follows: the base plate 18 is clamped once by adopting 1Cr18Ni9Ti stainless steel with the thickness of 33mm to finish turning of the shape and the plane, and a drilling machine is used for drilling holes and a milling machine is used for discharging air channels. The lower cavity of the vacuum cover 14 is in contact with the inner flange 15 for axial positioning.
After the vacuum pump is started: (1) the vacuum cover 14 is forced by its own weight and atmospheric pressure to make its lower lip closely contact with the upper surface of the rubber pad 17. (2) The annular air passage formed by the lower surface of the rubber pad 17 and the base plate 18 is communicated with the sealing cavity, so that the lower surface of the rubber pad 17 is in close contact with the base plate 18 under the action of atmospheric pressure, and the rubber pad is prevented from arching, bubbling, displacing and the like. The advantages of this design: the structure is simple, the sealing is reliable, the requirements on the processing precision and the installation precision are not high, and the manufacturing cost can be greatly reduced.
The sealing of the joints of the components of the vacuum system will affect the establishment of the vacuum degree of the system and the energy consumption of the vacuum pump. Therefore, the parts do not need to be disassembled and welded, and the rest parts are connected by special hoops. Because the vacuum pump 2 vibrates when running, in order to prevent the vibration of the vacuum pump 2 from being transmitted to the frame to cause resonance and noise, the vacuum pump is separated from the frame and is connected with the frame by a metal hose. Therefore, the problems of system sealing, isolation and shock absorption are solved.
In the invention, the vacuum pump of the equipment adopts a rotary vane vacuum pump 2 which is an oil-sealed mechanical vacuum pump, and because a large amount of oil is injected into the vacuum pump 2, the oil plays roles of freezing, lubricating and oil sealing; when the oil-gas separator works, oil gas is discharged from an exhaust port of the pump along with the rise of temperature, so that the environment is polluted. In order to ensure a good working environment on site and reduce noise and oil stains.
Claims (8)
1. A device for detecting the water immersion density of pellets comprises a vacuum chamber, a vacuum electromagnetic valve, a vacuum pump, a water inlet valve, an air release valve, a motor and an oil filter, wherein a negative pressure suction port, a water nozzle and a vacuum detection port, as well as the negative pressure suction port, the water nozzle and the vacuum detection port, are arranged in the vacuum chamber; a vacuum cover is arranged outside the vacuum chamber, and the lower end of the vacuum cover is hermetically installed with the sealing structure;
the method is characterized in that: the negative pressure suction port extends out of the sealing structure at the lower part of the vacuum chamber, the extending section is divided into two sections, one section is connected with an air release valve, the other section is connected with one end of a vacuum electromagnetic valve through a sleeved joint, the vacuum electromagnetic valve is communicated with a baffle vacuum electromagnetic valve through a metal hose, the baffle vacuum electromagnetic valve is connected with one port of a vacuum pump, the vacuum pump is provided with three ports, and the other two ports are respectively connected with a silencer and oil return device and a motor;
the water nozzle extends out of the sealing structure at the lower part of the vacuum chamber, the extending section is connected to one end of the water inlet valve, the other end of the water inlet valve is provided with a pipeline, and the pipeline is directly inserted into the measuring cup.
2. A device for pellet water immersion density detection as claimed in claim 1, wherein: the vacuum cover and the lower sealing structure are of a detachable installation structure, and the vacuum cover adopts a self-absorption pre-tightening mode.
3. A device for pellet water immersion density detection as claimed in claim 1, wherein: in order to prevent the immersion liquid from overflowing in the process of injecting the immersion liquid into the sample tray, the material of the vacuum cover of the vacuum device is selected, the material with visibility is selected to manufacture the vacuum cover, and the operation of the water inlet valve is effectively controlled.
4. A device for pellet water immersion density detection as claimed in claim 3, wherein: the vacuum cover is made of organic glass.
5. A device for pellet water immersion density detection as claimed in claim 1, wherein: the vacuum chamber structure comprises a basal disc, an inner flange, an outer flange, a vacuum cover, a rubber pad, a negative pressure suction port, a vacuum detection port and a water nozzle;
the inner cavity at the lower part of the vacuum cover is contacted with the inner flange for axial positioning.
After the vacuum pump is started, the vacuum cover forces the lip edge at the lower part of the vacuum cover to be tightly contacted with the upper surface of the rubber pad under the action of self weight and atmospheric pressure;
the annular air passage formed by the lower surface of the rubber pad and the base plate is communicated with the sealing cavity, and the lower surface of the rubber pad is in close contact with the base plate under the action of atmospheric pressure.
6. A device for pellet water immersion density detection as claimed in claim 5, wherein: the base plate is made of 33mm thick 1Cr18Ni9Ti stainless steel through one-step clamping, the shape and the plane are machined, and a drilling machine is used for drilling holes and a milling machine is used for discharging air channels.
7. A device for pellet water immersion density detection as claimed in claim 1, wherein: the vacuum pump is separated from the frame and is connected with the frame by a metal hose.
8. A device for pellet water immersion density detection as claimed in claim 1, wherein: the vacuum pump is a rotary vane vacuum pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811543882.0A CN111323333A (en) | 2018-12-17 | 2018-12-17 | Device for detecting water immersion density of core block |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811543882.0A CN111323333A (en) | 2018-12-17 | 2018-12-17 | Device for detecting water immersion density of core block |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111323333A true CN111323333A (en) | 2020-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811543882.0A Pending CN111323333A (en) | 2018-12-17 | 2018-12-17 | Device for detecting water immersion density of core block |
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| CN (1) | CN111323333A (en) |
Citations (9)
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|---|---|---|---|---|
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| CN102866081A (en) * | 2012-09-28 | 2013-01-09 | 哈尔滨理工大学 | Device and method for synchronously detecting viscosity and density of metal melt quickly |
| CN203083898U (en) * | 2013-01-30 | 2013-07-24 | 宁波工程学院 | Vacuum water absorption testing system of building energy-saving materials |
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| CN207263571U (en) * | 2017-08-29 | 2018-04-20 | 中核四0四有限公司 | Infiltration apparatus for the measurement of MOX pellet densities |
| CN108231521A (en) * | 2018-01-03 | 2018-06-29 | 大连理工大学 | A kind of quartz barrel sealing structure for low pressure radio frequency discharge |
| CN210051661U (en) * | 2018-12-17 | 2020-02-11 | 中核建中核燃料元件有限公司 | Device for detecting water immersion density of core block |
-
2018
- 2018-12-17 CN CN201811543882.0A patent/CN111323333A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201859829U (en) * | 2010-09-25 | 2011-06-08 | 上海远跃轻工机械有限公司 | Self-suction vacuum energy reclaiming structure |
| CN202047993U (en) * | 2011-05-16 | 2011-11-23 | 广州市白云泵业集团有限公司 | Vertical type self-sucking pump without shaft seal |
| CN102866081A (en) * | 2012-09-28 | 2013-01-09 | 哈尔滨理工大学 | Device and method for synchronously detecting viscosity and density of metal melt quickly |
| CN203083898U (en) * | 2013-01-30 | 2013-07-24 | 宁波工程学院 | Vacuum water absorption testing system of building energy-saving materials |
| CN203834000U (en) * | 2014-05-14 | 2014-09-17 | 厦门映日新材料科技有限公司 | Vacuum spraying rotary target automatic exhauster |
| CN105673461A (en) * | 2016-03-31 | 2016-06-15 | 河北昌骅专用汽车有限公司 | Unit forevacuum and leak detector integration system for molecular pump |
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