CN107290363A - High pressure low temperature in-situ neutron scattering device - Google Patents
High pressure low temperature in-situ neutron scattering device Download PDFInfo
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- CN107290363A CN107290363A CN201710610389.5A CN201710610389A CN107290363A CN 107290363 A CN107290363 A CN 107290363A CN 201710610389 A CN201710610389 A CN 201710610389A CN 107290363 A CN107290363 A CN 107290363A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
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Abstract
The present invention relates to high pressure low temperature in-situ neutron scattering device.According to an exemplary embodiment, a kind of in-situ neutron scattering device may include：Vacuum chamber, including cavity and top cover；On refrigeration machine, the top cover for being arranged on the vacuum chamber；Cold head, is connected to the refrigeration machine and is extended to through the top cover in the vacuum chamber；Reactor, is connected to the end of the cold head；And gas piping, it is connected to the reactor, wherein, the cavity of the vacuum chamber includes the upper chamber being made up of the first material and the lower cavity being made up of the second material, first material has the intensity higher than second material, and second material has the neutron permeability higher than first material.
Description
Technical field
Present invention relates in general to neutron research field, more specifically it relates to which a kind of high pressure low temperature in-situ neutron scattering is filled
Put.
Background technology
High pressure is a kind of important research meanses, as pressure increases, and the volume of material is tapered into, and atomic distance is gradually
Shorten, promote the change of the overlapping degree and free energy between electron wave function, may finally cause material structure and
Property changes, in some instances it may even be possible to produce novel substance.Temperature can reflect the severe degree of material molecular thermalmotion, and temperature is lower,
Molecular motion is slower, so as to reflect the physical essence of material.In addition, temperature also influences the crystal lattice state that material is present,
For example as temperature is reduced, the hydrone of free movement is regularly arranged to form ice crystal lattice.The extreme condition of high pressure low temperature is can
For exploring a kind of important means that extreme condition produces influence on material essence.Moreover, also exist in nature and permitted
The materials for being in high pressure low temperature extreme environment, the combustible ice for example having now found that (gas hydrates) is by fuel gas more
The cage type crystal of a kind of non-stoichiometry generated with water under the conditions of cryogenic high pressure, because the natural gas of naturally occurring is hydrated
Thing is used as a kind of huge potential energy source presence and the risk factor of submarine geological hazard and greenhouse effects, many countries and ground
Formation and exploitation of the cryogenic high pressure system to hydrate are simulated one after another and shows unprecedented interest in area.
Neutron research is a kind of multiduty research tool, covers multiple subjects such as physics, chemistry, material and engineering.
Scattering occurs for the atomic nucleus effect of neutron beam and material internal, and there is provided the details of material structure research.Neutron scattering technology
Using neutron is not charged, penetration power is extremely strong, can directly differentiate nucleic, it is sensitive to light element than X-ray, with magnetic moment and wave-particle
The features such as duality, it has also become it is a kind of it is unique, study from atom and molecular scale the various structures of matter and microcosmos fortune
The sophisticated technology of dynamic rule.Therefore, neutron scattering not only can carry out scrutiny to the structure and physical property of material, can also survey
Determine the structure and physical property of synchrotron radiation not measurable light element in itself.In addition, neutron has very strong penetration capacity, it can wear
Cross the cavity for maintaining sample environment.
China also increasingly focuses on the research in neutron scattering field, has built up multiple neutron sources, including Chinese spallation
Neutron source CSNS, Chinese Mianyang research reactor CMRR, China Advanced Research Reactor CARR etc..Meanwhile, also develop many for neutron
The in-situ test equipment of scattering, such as band magnetic field, vacuum controlled in-situ test equipment.However, at present in high pressure low temperature bar
It is still blank in terms of in-situ neutron scattering research under part.Under high pressure low temperature extreme condition, it is possible to use neutron beam is to sample
The reaction of itself and sample, building-up process are studied, and this research meanses can to energy storage material and high pressure field of new materials
It can be highly useful new tool.However, realizing that high pressure low temperature in-situ neutron scattering device still needs to overcome many difficulties.Height is forced down
Warm extreme condition generally requires the equipment of complexity to realize, on the one hand needs to realize these complexity to try one's best compact volume
Equipment, on the other hand also needs to the influence for avoiding these equipment to neutron beam as far as possible, to ensure the standard of in-situ neutron scattering measurement
True property.In addition, requirement of the high pressure low temperature in-situ neutron scattering device to air-tightness is also very high.
The content of the invention
An exemplary embodiment of the invention provides a kind of in-situ neutron scattering device, including：Vacuum chamber, including cavity and top
Lid；On refrigeration machine, the top cover for being arranged on the vacuum chamber；Cold head, is connected to the refrigeration machine and extends through the top cover
Into the vacuum chamber；Reactor, is connected to the end of the cold head；And gas piping, the reactor is connected to, its
In, the cavity of the vacuum chamber includes the upper chamber being made up of the first material and the lower cavity being made up of the second material, institute
The first material is stated with the intensity higher than second material, second material have it is higher than first material in
Sub- permeability.
In one example, the cold head extends downwardly a length to cause the reactor is located at described true from the top cover
In the space that the lower cavity of cavity is surrounded, and the part corresponding with the reactor of the lower cavity has than under described
The smaller thickness of the other parts of portion's cavity.
In one example, the upper chamber is made of stainless steel, and the lower cavity is made up of aluminium alloy.
In one example, the upper chamber and the lower cavity are sealingly engaged one another by flange arrangement.
In one example, the cold head includes the one-level cold head for being connected to the refrigeration machine and extended from the one-level cold head
Two grades of cold heads, two grades of cold heads have than the one-level cold head less diameter.
In one example, the cold head is made of copper.
In one example, the reactor includes：Screw, upper end is connected to inside the end of the cold head, the screw
Gas circuit is provided with, one end of the gas circuit is at the valve of the screw lower end, and the other end of the gas circuit is exposed to institute
The screwed hole for stating screw side is sentenced for being connected to the gas piping；Body, with cylindrical shape and with for accommodating
The chamber of testing sample, the opening of the chamber is joined to the valve of the screw gas circuit is connected with the chamber
It is logical, there is the first extension diametrically stretched out at the opening of the chamber；And flange sleeve, with cylindrical shape,
Be enclosed on the body and be threadedly coupled to the screw, the lower end of the flange sleeve have the second extension for extending internally with
The first extension of the body is blocked, so as to the body is fastened on the valve of the screw.
In one example, the screw and the flange sleeve are made up of aluminium alloy or beallon, the body by vanadium or
Titanium-zirconium alloy is made.
In one example, the valve has a circular cone shape, the edge of opening of the chamber of the body have oblique cutting part with
It is engaged with the tapered slope of the frustum of a cone.
In one example, the circular conical surface of the valve of the circular cone shape has about relative to the central axis of the screw
73 ° of angles, the oblique cutting part of the body has about 74 ° of angles relative to the central axis of the body.
In one example, the circular conical surface of the valve of the circular cone shape has about relative to the central axis of the screw
59 ° of angles, the oblique cutting part of the body has about 60 ° of angles relative to the central axis of the body.
High pressure low temperature in-situ neutron scattering device according to above-described embodiment realizes heat-insulated environment using vacuum chamber, so that
Refrigeration machine can make the reactor being located in vacuum chamber reach required low temperature environment.Reactor passes through screw threads for fastening using flange sleeve
Onto high pressure screw, and flange sleeve blocks the cocked bead of high pressure body, and the main part of high pressure body is exposed to flange
Outside set, so that flange sleeve does not interfere with the neutron beam acted on sample, while flange sleeve ensure that high pressure body closely
It is joined on high pressure screw.The part engaged with high pressure body of high pressure screw is provided with the valve of truncated cone shape, high-voltage tube
The opening portion of the chamber of body is provided with incisal bevel, this facilitate sealing engagement therebetween, so as to realize high pressure conditions.On
State device and pass through the ingehious design in terms of structure and material, it is ensured that the influence to neutron beam is minimized, and disclosure satisfy that height is forced down
The use of warm neutron scattering research.
Brief description of the drawings
Fig. 1 shows the sectional view of high pressure low temperature in-situ neutron scattering device according to an embodiment of the invention；
Fig. 2 shows the top view of high pressure low temperature in-situ neutron scattering device according to an embodiment of the invention；
Fig. 3 shows that the part of the reactor in high pressure low temperature in-situ neutron scattering device according to an embodiment of the invention is put
Big view；
Fig. 4 shows the high pressure spiral shell of the reactor in high pressure low temperature in-situ neutron scattering device according to an embodiment of the invention
The partial enlarged view of silk；
Fig. 5 shows the high-voltage tube of the reactor in high pressure low temperature in-situ neutron scattering device according to an embodiment of the invention
The partial enlarged view of body；And
Fig. 6 shows the flange sleeve of the reactor in high pressure low temperature in-situ neutron scattering device according to an embodiment of the invention
Partial enlarged view.
Embodiment
The present invention is described in further detail below by embodiment combination accompanying drawing.The application can be with a variety of
Different forms is realized, however it is not limited to embodiment described by the present embodiment.The purpose of detailed description below is provided
It is easy for becoming apparent from present disclosure thorough explanation, the wording of the wherein indicating position such as upper and lower, left and right is only pin
To shown structure in respective figure for position.
However, those skilled in the art may be aware that one or more detail description can be by
Omit, or can also be using other methods, component or material.In some instances, some embodiments are not described
Or be not described later in detail.
In addition, technical characteristic described herein, technical scheme can also be closed arbitrarily in one or more embodiments
Suitable mode is combined.For those skilled in the art, it is easy to understand with provided herein is embodiment relevant method
Step or operation order can also change.Therefore, any order in drawings and examples is merely illustrative purposes, not secretly
Show requirement in a certain order, require unless expressly stated according to a certain order.
Fig. 1 shows the sectional view of the high pressure low temperature in-situ neutron scattering device 100 according to an exemplary embodiment of the invention.
High pressure low temperature in-situ neutron scattering device 100 can be used in high pressure low temperature environment using neutron scattering experiment come to sample itself
Or the synthesis of sample and decomposable process are studied.As shown in figure 1, high pressure low temperature in-situ neutron scattering device 100 is including cold
But device 110 and vacuum chamber 120.
Cooling device 110 may include refrigeration machine 110, and it may be provided on the top cover 122 of vacuum chamber 120.Certainly, refrigeration machine
110 can also be arranged on other positions, such as on the side of vacuum chamber 120.Refrigeration machine 110 can be any existing or not
Come the refrigeration plant developed, such as commercially available PDK-408D2 type refrigeration machines.Refrigeration machine 110 is connected to cold head, and it is at least
Including one-level cold head 114 and two grades of cold heads 116, one-level cold head 114 and two grades of cold heads 116 pass through top cover 122 and extended to true
In cavity 120, the end of two grades of cold heads 116 can also be connected with reactor 130, and it will be described in detail later.One-level is cold
First 114 and two grades of cold heads 116 can all be formed by the good metal or alloy material of heat conductivility, be for example made up of fine copper.So,
The heat of reactor 130 can be discharged to outside vacuum chamber 120 by cold head 114 and 116 by refrigeration machine 112, so that in reaction
Cryogenic conditions are realized in kettle 130.Thermocouple wire can be extended near reactor 130 from refrigeration machine 112 around cold head 114 and 116, with
For measuring the temperature at reactor 130, the temperature can be used for the operation for controlling refrigeration machine 112 as feedback parameter.One-level
Cold head 114 and two grades of cold heads 116 can all have the cross section of cylinder, it is of course possible to other shapes such as square and length
Square cross section.The cross-sectional diameter of two grades of cold heads 116 is smaller than the cross-sectional diameter of one-level cold head 114, so as to increase
Operating space near big reactor 130.Although two grades of cold heads foregoing illustrate, it is to be appreciated that also can be used more or more
The cold head of few series.
Vacuum chamber 120 includes top cover 122 and cavity 124.Cavity 124 can have drum, can have other shapes,
Such as cubic shaped.Top cover 122 covers the open top of cavity 124, so as to limit the vacuum chamber in cavity 124.Top cover
122 can have the cross section identical or different from the cross section of cavity 124, and for example the two is all circular or square, Huo Zheyi
It is individual to be square, another is circle.Although it is not shown, can also be formed with flange arrangement, method at the top edge of cavity 124
Blue upper surface can form fluted, and O circles can be provided with groove, so as to when being covered by top cover 122, can form good
It is gas-tight seal.
Especially, in an embodiment of the present invention, cavity 124 is made up of some.Specifically, cavity 124 includes
Upper chamber 125 and lower cavity 127.Upper chamber can be made up of high-abrasive material such as stainless steel, and it is both ends open
It is cylindric.Lower cavity 127 can be made up of the material such as aluminium alloy with good neutron permeability, and be lower end closed,
The cylindrical shape that upper end is opened.It can be connected to each other, for example, passed through by sealed interface between upper chamber 125 and lower cavity 127
Flange 126 is sealingly coupled with each other, O circles can also be provided with flange 126 gas-tight seal to ensure.Although it is not shown, on
Portion's cavity 125 and the flange of lower cavity 127 126 can be fastened by bolt or fixture, to ensure the He of upper chamber 125
Lower cavity 127 is tightly attached to each other.Upper chamber 125 and lower cavity 127 can have identical wall thickness, and the two can also have
There are different wall thickness.For example, in one embodiment, the wall thickness of lower cavity 127 can be thinner than upper chamber 125, to enter one
Step improves the permeability of neutron.
As shown in Fig. 2 the height of lower cavity 127 can be bigger than upper chamber 125, and cold head 114,116 can be with
Extended to from top cover 122 in the altitude range of lower cavity 127 so that reactor 130 is located at what lower cavity 127 was surrounded
In chamber, to avoid influence of the upper chamber 125 to neutron signal.Although it is not shown, lower cavity 127 and reactor
130 corresponding parts can have the thickness smaller than the other parts of lower cavity 127, and the thickness of such as part can be with thin
For 0.5mm or so or smaller, so as to further improve the permeability of neutron, it is ensured that the signal intensity of testing sample.
Multiple interfaces are also provided with cavity 124, for example, vacuumize interface 121, it is shown in Fig. 2 top view,
And the interface of cavity 124 is passed through for pipeline 128.Vacuum interface 121 can be used for, to vacuumizing in vacuum chamber 120, producing vacuum
Adiabatic environment, reduce thermal loss.Pipeline 128 can be such as 1/8 pipe, its can be used for being passed through into reactor 130 it is a kind of or
Multiple gases are to obtain condition of high voltage, or the gas being passed through can be also used for synthesis or decomposition reaction etc..Although it is not shown, but
It is that other interfaces are also provided with cavity 124, such as interface for installing vacuum gauge.These interfaces are preferably provided at tool
Have in the upper chamber 125 of higher-strength.
Fig. 3 shows the partial enlarged view of the part in Fig. 1 circle A, i.e. reactor 130, and Fig. 4,5 and 6 are shown respectively
The zoomed-in view of a part in reactor 130.As shown in Fig. 3 to 6, reactor 130 includes high pressure screw 132, flange sleeve 136
With high pressure body 138.
High pressure screw 132 can be made up of the aluminium alloy of high intensity or the beryllium copper of high rigidity, the inside middle of high pressure screw 132
High-pressure gas circuit 135 provided with strip cylindrical type, it is connected to high pressure screw 132 and locates the screwed hole to be formed sideways, and it can be
(not shown, screw thread is formed for recessed screwed hole (as shown in figure 3, screw thread formation is on the inwall of hole) or the screwed hole of protrusion
On the outer wall of projection).The screwed hole may be threadably connected to pipeline 128 for being passed through required gas into reactor,
Such as methane, propane, helium, argon gas, air.The upper side of high pressure screw 132 is formed with screw thread 131, for screw thread
It is connected to the end of two grades of cold heads 116.The lower end of high pressure screw 132 is settable valve 134, and valve 134 can have the frustum of a cone
Shape, with airtight joint at the opening of high pressure body 138 so that gas circuit 135 is connected with the space in high pressure body 138.
The lower side of high pressure screw 132 can be formed with screw thread 133 with flange sleeve 136 to be connected.
High pressure body 138 can be made up of pure vanadium or titanium pick alloy, and pure vanadium does not have neutron scattering peak, and titanium pick alloy has good
Neutron penetrance.High pressure body 138, which generally has at cylindrical shape, upper end-face edge, is formed with the extension stretched out
139, for being snapped onto by flange sleeve 136 on high pressure screw 132.High pressure chest of the inside of high pressure body 138 provided with cylinder
Body, for taking up various samples, such as the water required for hydrate reaction or sand-like ice crystal.The edge quilt of cavity hatch
Beveling, is engaged with the truncated cone shape with valve 134, realized gas-tight seal.Such as raw material can also be wound with valve 134
Band, to strengthen sealing.
The inventors discovered that, in order to realize the airtight joint between valve 134 and high pressure body 138, the circular cone of valve 134
The mis-cut angle of oblique cutting part at the angle of the circular conical surface of platform shape and the chamber opening of high pressure body 138 is extremely important.Work as gas
The circular conical surface of the truncated cone shape of mouth 134 relative to high pressure screw 132 central axis into about 73 ° of angles, and high pressure body 138
Chamber opening at central axis of the scarf relative to high pressure body 138 into about 74 ° of angles when, can realize and be up to about
5000psi or higher high pressure.When central axis of the circular conical surface relative to high pressure screw 132 of the truncated cone shape of valve 134
Into central axis of the scarf relative to high pressure body 138 at about 59 ° of angles, and the chamber opening of high pressure body 138 into about
During 60 ° of angles, up to more than 10000psi high pressure can be realized.Under other angles, achieved high-pressure horizontal is considerably lower.
Therefore, above-mentioned angle is preferred.
Flange sleeve 136 can be made up of the aluminium alloy or beryllium copper of high intensity,.Flange sleeve 136 has cylindrical shape, top cylinder
Inwall is formed with screw thread, to be threadably fastened in the lower thread 133 of high pressure screw 132.The lower edge 137 of flange sleeve 136
It is inwardly projecting so that the diameter of lower openings is less than the diameter of the extension 139 of high pressure body 138, so that flange sleeve 136 can be by
High pressure body 138 is snapped onto on high pressure screw 132, and causes the upper end cavity hatch and high pressure screw 132 of high pressure body 138
Lower end valve 134 engage.On the outer surface of flange sleeve 136 and high pressure screw 132 can be set have clamping plane, in order to
Such as spanner blocks the clamping plane to tighten high pressure screw 132 and flange sleeve 136.
The assembling process of reactor 130 is described below.Load testing sample in the inner chamber of high pressure body 138 first,
Raw material band is wrapped with the valve 134 of high pressure screw 132, it is noted that exposure venthole, and valve 134 is directed at contact high pressure
At the lumen openings of body 138.Flange sleeve 136 is enclosed on high pressure body 138 to and is screwed to hand the bottom of high pressure screw 132
On screw thread 133., can be with tool cards such as spanners in high pressure screw 132 and the outer surface of flange sleeve 136 after being screwed to a certain degree
On clamping plane on, further to tighten the two, realize high pressure screw 132 and high pressure body 136 joint it is airtight close
Envelope.It is then possible to which high pressure screw 132 to be tightened to the lower end of two grades of cold heads 116, gas circuit 128 is tightened to the side of high pressure screw 132
Screwed hole on wall, so as to complete the assembling of reactor 130.Sampling process can then be performed with reverse-order, be repeated no more here.
The high pressure low temperature in-situ neutron scattering device of above-described embodiment is followed successively by refrigeration machine 112, one-level cold head from top to bottom
114th, two grades of cold heads 116, reactor high pressure screw 132, reactor high pressure bodys 138, reactor flange sleeves 136, outside is used
Vacuum chamber 120 is sealed.Wherein one-level cold head 114, the high-pressure gas circuit 135 in two grades of cold heads 116, high pressure screws 132, high pressure
The central axis of cavity and flange sleeve 136 in body 138 is point-blank.The top cover 122 of vacuum chamber 120 with it is upper
It can be sealed using O circles between portion's cavity 125 and between upper chamber 125 and lower cavity 127, and can be by
Vacuumize, so as to provide an adiabatic environment.Can at reactor air-tightness, the lower end valve 134 of high pressure screw 132 to reach
Truncated cone shape is formed with, and can be with raw material band winding thereon, the cavity hatch periphery of high pressure body 138 can form beveling
Face so that the scarf contacts the tapered slope of the frustum of a cone, and causes the two inclined-planes each other by tightening flange sleeve 136
It is in close contact, so as to realize gas-tight seal.
In the present embodiment, the upper part of vacuum cavity uses such as stainless steel of the material with higher-strength to make, with
Improve the overall intensity of vacuum chamber；The lower part of vacuum cavity uses aluminium alloy to make to reduce the back end of neutron scattering, and
The thickness of lower part can be thinner than upper part.Reactor high pressure body is made by such as vanadium of the material without neutron scattering peak, can
Effectively reduce loss and the coherent scattering back end of neutron.
The operation principle of the high pressure low temperature in-situ neutron scattering device of the present embodiment is as follows.
Install and seal：Refrigeration machine and cold head and electricity jack are connected with external circuit and are controlled cooling, as above
The reactor containing testing sample is installed in cold head end describedly.The upper and lower part of vacuum cavity is utilized into annular rubber ring
Sealed with clip, and cover the top cover of vacuum chamber, connection vacuum chamber and peripheral vaccum-pumping equipment, started to vacuumize and drop
Temperature.Connecting line and peripheral high-pressure air source, such as booster pump and gas cylinder, for providing high-pressure atmosphere.
Vacuumize and hunt leak：Cavity is carried out by the vacuum interface of vacuum cavity using vaccum-pumping equipment such as molecular pump
Vacuumize, an environment close to vacuum insulation will be reached in vacuum cavity.Reach after required vacuum, by booster pump to
Required gases at high pressure are squeezed into reactor high-pressure chamber, waits ten minutes, passes through external pressure table look-up air-tightness.If gas
Close property is good, deflates and is repeated four times the gas washing using high-purity gas progress to reactor cavity, last time inflation is remained to
Pressure needed for experiment.
Reaction and detection：Before neutron scattering experiments, sample in reactor must be reached corresponding gas pressure value and temperature
Value, makes the sample inside high-pressure chamber fully react.Reach and sub-channel switch opened after required temperature, time and pressure,
Start neutron scattering experiment of the sample in the original location under gases at high pressure.
The high pressure low temperature in-situ neutron scattering device that the present embodiment is provided, due to the taper circle at the opening of high pressure body 135
Platform 134 is docked with high-pressure chamber 138, and is tightened with flange sleeve 136 so that high-pressure chamber has higher air-tightness, and pure
The cold head end plane of copper disclosure satisfy that high pressure and the environment of low temperature and neutron scattering make in reactor top plan good contact
Use condition.
Use above specific case is illustrated to the present invention, is only intended to help and is understood the present invention, not to limit
The system present invention.For those skilled in the art, according to the thought of the present invention, it can also make some simple
Deduce, deform or replace.
The related work of the application has obtained state key research and development plan (National Key R＆D Program of
China) 2016YFA0401530 support, expresses thanks herein.
Claims (10)
1. a kind of in-situ neutron scattering device, including：
Vacuum chamber, including cavity and top cover；
On refrigeration machine, the top cover for being arranged on the vacuum chamber；
Cold head, is connected to the refrigeration machine and is extended to through the top cover in the vacuum chamber；
Reactor, is connected to the end of the cold head；And
Gas piping, is connected to the reactor,
Wherein, the cavity of the vacuum chamber includes the upper chamber being made up of the first material and the lower chamber being made up of the second material
Body, first material has the intensity higher than second material, and second material has than first material more
High neutron permeability.
2. in-situ neutron scattering device as claimed in claim 1, wherein, the cold head extends downwardly a length from the top cover
To cause the reactor to be located in the space that surrounds of lower cavity of the vacuum chamber, and the lower cavity with it is described anti-
Answer the corresponding part of kettle that there is the thickness smaller than the other parts of the lower cavity.
3. in-situ neutron scattering device as claimed in claim 1, wherein, the upper chamber is made of stainless steel, it is described under
Portion's cavity is made up of aluminium alloy.
4. in-situ neutron scattering device as claimed in claim 1, wherein, the upper chamber and the lower cavity pass through method
Blue structure sealingly engages one another.
5. in-situ neutron scattering device as claimed in claim 1, wherein, the cold head includes being connected to the one of the refrigeration machine
Level cold head and the two grades of cold heads extended from the one-level cold head, two grades of cold heads have smaller than the one-level cold head straight
Footpath.
6. in-situ neutron scattering device as claimed in claim 1, wherein, the cold head is made of copper.
7. in-situ neutron scattering device as claimed in claim 1, wherein, the reactor includes：
Screw, upper end is connected to the end of the cold head, and the screw is internally provided with gas circuit, and one end of the gas circuit is exposed to
At the valve of the screw lower end, the screwed hole of the other end of the gas circuit exposed to the screw side is sentenced for being connected to
The gas piping；
Body, with cylindrical shape and with the chamber for being used to accommodate testing sample, the opening of the chamber is joined to the spiral shell
The valve of silk is to cause at the gas circuit and the chamber, the opening of the chamber with diametrically stretching out
First extension；And
Flange sleeve, with cylindrical shape, is enclosed on the body and is threadedly coupled to the screw, the lower end of the flange sleeve has
The second extension extended internally is to block the first extension of the body, so that the body is fastened into the screw
On valve.
8. in-situ neutron scattering device as claimed in claim 7, wherein, the screw and the flange sleeve are by aluminium alloy or beryllium
Copper alloy is made, and the body is made up of vanadium or titanium-zirconium alloy.
9. in-situ neutron scattering device as claimed in claim 7, wherein, the valve has circular cone shape, the body
There is the edge of opening of chamber oblique cutting part to be engaged with the tapered slope with the frustum of a cone.
10. in-situ neutron scattering device as claimed in claim 9, wherein, the circular conical surface of the valve of the circular cone shape is relative
There are about 73 ° of angles in the central axis of the screw, the oblique cutting part of the body has relative to the central axis of the body
About 74 ° of angles, or
Wherein, the circular conical surface of the valve of the circular cone shape has about 59 ° of angles, the pipe relative to the central axis of the screw
The oblique cutting part of body has about 60 ° of angles relative to the central axis of the body.
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| CN201710610389.5A CN107290363A (en) | 2017-07-25 | 2017-07-25 | High pressure low temperature in-situ neutron scattering device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108663276A (en) * | 2018-04-03 | 2018-10-16 | 中国科学院高能物理研究所 | A kind of sample Environmental coupling loading device for neutron scattering |
| CN109030232A (en) * | 2018-08-14 | 2018-12-18 | 兰州大学 | Neutron scattering cryogenic tensile Dewar |
| CN109444185A (en) * | 2018-12-01 | 2019-03-08 | 金华职业技术学院 | A kind of device for neutron scattering experiment |
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| CN109991255B (en) * | 2019-05-22 | 2024-01-05 | 中国科学技术大学 | High-pressure cavity piston cylinder for X-ray scattering and manufacturing method thereof |
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