CN206478160U - A kind of damping of NMR imaging device - Google Patents
A kind of damping of NMR imaging device Download PDFInfo
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- CN206478160U CN206478160U CN201621320326.3U CN201621320326U CN206478160U CN 206478160 U CN206478160 U CN 206478160U CN 201621320326 U CN201621320326 U CN 201621320326U CN 206478160 U CN206478160 U CN 206478160U
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Abstract
The utility model discloses a kind of damping of NMR imaging device, including refrigeration machine, cold screen and the vacuum tank being socketed on refrigeration machine, mounting flange is provided between the refrigeration machine and vacuum tank, the mounting flange lower end is provided with one-level damping device, the one-level damping device includes zero pressure difference bellows, the zero pressure difference bellows-sheathed is connected on the vacuum tank, and the upper end of the zero pressure difference bellows is connected with the mounting flange, a kind of damping of NMR imaging device of the present utility model, its is simple in construction, simultaneously, using level Four damping, and pass through level Four damping coordinated, so improve equipment damping effect, so that the image definition obtained is greatly improved.
Description
Technical field
The utility model is related to magnetic resonance imaging device technical field, more particularly to a kind of NMR imaging device
Damping.
Background technology
Medical nuclear magnetic resonance imaging technology turns into a kind of important clinical treatment diagnostic imaging technology.The technology is using penetrating
Frequency pulse is excited to the atomic nucleus of the main component hydrogen of the human body in magnetic field, obtains nuclear magnetic resonance transmitting letter
Number, it is spatially encoded by gradient magnetic, by a certain cross-sectional image of computerized algorithm processing reconstructed human body.Superconducting magnet is core
The main hardware of magnetic resonance imaging system.
Superconducting magnet provides a stability high background magnetic field, is the main hardware of MRI system,
It is the key component of whole system.In order to maintain the low temperature environment required for superconducting magnet operation, superconducting magnet must use system
Cold is freezed.The heat that refrigeration machine acting is removed is if equal to the extraneous heat for leaking into low-temperature (low temperature) vessel, is just maintained at low-temperature (low temperature) vessel
In a stable low temperature.The ratio of performance to price of G-M refrigeration machines has increased significantly in recent years, current Magnetic resonance imaging
System mainly uses this refrigeration machine.The swelling heat absorption on cold head freezes by gases at high pressure for G-M refrigeration machines, refrigeration machine
There is piston movement part in inside, this inevitably brings the Small mechanical vibrations of cold head.Because refrigeration machine passes through low-temperature (low temperature) vessel
Sealing mechanism is connected with superconducting coil, and this mechanical oscillation can drive superconducting coil to move, and is disturbed so as to produce unnecessary magnetic field
Dynamic, this causes frequency and phase in the NMR signal of required acquisition to produce change, influences the resolution ratio of image, it is impossible to fill
The performance of of superconducting magnet itself, the accuracy of final influence clinical diagnosis are waved in distribution.
Utility model content
Problem to be solved in the utility model is to provide a kind of damping of NMR imaging device, existing to overcome
There is refrigeration machine in technology to produce the defect vibrated；With the stability for the image definition for improving magnetic resonance imaging device.
The utility model solves one of technical scheme that above-mentioned technical problem is used：A kind of NMR imaging device
Damping, including refrigeration machine, cold screen, vacuum tank, the vacuum tank is socketed on refrigeration machine, the refrigeration machine with it is true
Mounting flange is provided between empty container, the mounting flange lower end one-level damping device is provided with, the one-level damping device
Including zero pressure difference bellows, the zero pressure difference bellows-sheathed is connected on the vacuum tank, and the zero pressure difference bellows
Upper end is connected with the mounting flange.
Further, the zero pressure difference bellows is the first thin-wall corrugated tube, the upper end of first thin-wall corrugated tube and peace
Fill in the connection of flange lower end, first thin-wall corrugated tube and be arranged with the second thin-wall corrugated tube, on the inside of second thin-wall corrugated tube
Cavity connected with the cavity on the inside of first thin-wall corrugated tube.Further, the upper end of first thin-wall corrugated tube with
Connected mode between mounting flange lower end is welding.
Further, the upper end of second thin-wall corrugated tube and the lower end of first thin-wall corrugated tube are by setting Guan Lian
Fitting is connected.
The pipe connections are included on zero pressure difference bellows (i.e. the first thin-wall corrugated tube) lower end and the second thin-wall corrugated tube
Dividing plate between end.Pipe connections connect the first thin-wall corrugated tube with the second thin-wall corrugated tube so that the first thin-walled ripple
The inner side cavity of line pipe is connected with cavity on the inside of the second thin-wall corrugated tube.The shape of the pipe connections can be integrated shape
Into, or segmental structure.
In a preferred embodiment, the pipe connections are segmental structure.The pipe connections include connecting successively
First level connecting plate, longitudinally connected pipe and the second horizontal connecting plate connect, the pipe connections include first be sequentially connected
Horizontal connecting plate, longitudinally connected pipe and the second horizontal connecting plate.The first level connecting plate is annular slab, is set in second
The upper end periphery of thin-wall corrugated tube.Second horizontal connecting plate is also annular slab.The first thin-wall corrugated tube lower end passes through
Second horizontal connecting plate is arranged on the wall of vacuum tank, the longitudinally connected pipe then respectively connection first level connecting plate and
Second horizontal connecting plate, certain gap is left between the longitudinally connected pipe and the first thin-wall corrugated tube.
Further, two-step buffer is provided between the one-level cold head and the mounting flange on the refrigeration machine,
Flexible member of the two-step buffer by shock absorption trolley and positioned at shock absorption trolley one end is constituted.
Further, three-level damping device, the three-level are provided between the one-level cold head on the cold screen and the refrigeration machine
Damping device includes upper copper flange, lower copper flange, installing plate and is arranged between the upper copper flange and lower copper flange and has
There is the conduction cooling copper cash of shock-absorbing function；The upper copper flange is set on one-level cold head and is in close contact with one-level cold head；The peace
Dress plate is fixed on cold screen, and the upper copper flange is set on one-level cold head and is in close contact with one-level cold head, the lower copper method
Orchid is fixed on a mounting board.Connected between the installing plate and lower copper flange by connector, the connector preferably by
Bolt；The installing plate is preferably by aluminium sheet.
Further, the length of the conduction cooling copper cash with shock-absorbing function be more than or equal to upper copper flange and lower copper flange it
Between 1.5 times of minimum range.
Further, the vacuum tank periphery is provided with magnet iron yoke, and four are provided between the magnet iron yoke and mounting flange
Level damping device.
Further, elastic connecting device is provided between the magnet iron yoke and the mounting flange, the level Four is constituted and subtracts
Shake device；Described elastic connecting device one end connects the magnet iron yoke, and the other end connects the mounting flange.
Magnet iron yoke is both the flux circuit of nmr magnet, is the base of equipment again, is weighed very much.Increase the matter of object
Amount can reduce its amplitude, therefore can reduce the amplitude of mounting flange by the way that mounting flange is installed in magnet iron yoke.
Meanwhile, elastic connecting device is installed additional between mounting flange and magnet iron yoke as level Four shock-absorption device, the elastic connecting device
With certain elasticity, influence of the vibration to system of mounting flange can be substantially reduced.
Further, technical scheme preferably, the level Four damping device includes the first Z springs mounting screw, Z springs and the 2nd Z
Spring mounting screw, described Z springs one end is fixed on mounting flange by the first Z spring mounting screws, and the Z springs other end passes through
Two Z spring mounting screws are fixed in magnet iron yoke.In the technical scheme, Z springs have good elastic and good rigidity, can be with
Further absorb the vibrational energy from refrigeration machine so that influence of the vibration of mounting flange to system is minimized.
The utility model solves the another technical scheme that is used of above-mentioned technical problem：A kind of NMR imaging device
Damping, including refrigeration machine, cold screen, vacuum tank, the vacuum tank is socketed on refrigeration machine, the refrigeration machine with it is true
It is provided between mounting flange, the one-level cold head and the mounting flange on the refrigeration machine and subtracts provided with two grades between empty container
Device is shaken, flexible member of the two-step buffer by shock absorption trolley and positioned at shock absorption trolley one end is constituted.
The utility model solves the another technical scheme that is used of above-mentioned technical problem：A kind of NMR imaging device
Damping, including refrigeration machine, cold screen, vacuum tank, the vacuum tank is socketed on refrigeration machine, the refrigeration machine with it is true
Mounting flange is provided between empty container, the vacuum tank periphery is provided with magnet iron yoke, the magnet iron yoke and mounting flange it
Between be provided with level Four damping device.
Further, elastic connecting device is provided between the magnet iron yoke and the mounting flange, the level Four is constituted and subtracts
Shake device；Described elastic connecting device one end connects the magnet iron yoke, and the other end connects the mounting flange.
Magnet iron yoke is both the flux circuit of nmr magnet, is the base of equipment again, is weighed very much.Protected in oscillation power
Hold it is constant in the case of, the quality of increase object can reduce its amplitude, therefore can be by the way that mounting flange is installed into magnet
In iron yoke, the amplitude of mounting flange is reduced by increasing the quality of vibrating object.Meanwhile, mounting flange and magnet iron yoke with
Between install elastic connecting device additional as level Four shock-absorption device, the elastic connecting device has certain elasticity, can significantly subtract
Influence of the vibration of few mounting flange to system.
Further, the level Four damping device includes the first Z springs mounting screw, Z springs and the 2nd Z spring mounting screws, the Z
Spring one end is fixed on mounting flange by the first Z spring mounting screws, and the Z springs other end is solid by the 2nd Z springs mounting screw
It is scheduled in magnet iron yoke.In the technical scheme, Z springs have good elastic and good rigidity, can further absorb and come from
The vibrational energy of refrigeration machine so that influence of the vibration of mounting flange to system is minimized.
The above-mentioned low-temperature (low temperature) vessel being previously mentioned is used to accommodate liquid helium, is the low-temperature receiver supplier of whole system.
The utility model solves the another technical scheme that is used of above-mentioned technical problem：A kind of NMR imaging device
Damping, including refrigeration machine, cold screen, vacuum tank, magnet iron yoke, the vacuum tank is socketed on refrigeration machine, described
Mounting flange is provided between refrigeration machine and vacuum tank, the magnet iron yoke is located at vacuum tank periphery；The Method for Installation
Blue lower end is provided between the one-level cold head on one-level damping device, the refrigeration machine and the mounting flange to be filled provided with two grades of dampings
Put, three-level damping device is provided between the cold screen and the one-level cold head, between the magnet iron yoke and the mounting flange
Provided with level Four damping device.In the technical scheme, using level Four damping, and by level Four damping device coordinated, improve
The damping effect of equipment, also causes image definition stability to significantly improve.
Compared with prior art, the technical solution of the utility model has the following advantages that：
1st, the damping of a kind of NMR imaging device provided by the utility model, its is simple in construction, meanwhile, adopt
Level Four damping is used, and by level Four damping coordinated, enhances its damping effect, also causes image definition and stably
Property is significantly improved.
2nd, the damping machine constituted using one-level damping device, two-step buffer, three-level damping device, level Four damping device
Structure, its one-level damping device is by the setting of zero pressure difference bellows, and making bellows, no pressure is poor in this configuration, so with very
Good elasticity, so as to weaken mounting flange to cold screen and the Vibration propagation of low-temperature (low temperature) vessel, two-step buffer then passes through
Using flexible draw bar, mounting flange and a cold head is not produced excessive resonance and is reached damping, three-level damping device be then for
Eliminate the influence that one-level cold head vibrate to cold screen, level Four damping device uses Z springs, its Z spring has good elasticity and well
Rigidity, can further absorb the vibrational energy from refrigeration machine so that influence of the vibration of mounting flange to system is down to
It is minimum.
3rd, one end of shock absorption trolley sets flexible member；The flexible member can be the flexible bullet with pooling feature
Spring, shock absorption trolley is fixed with one-level cold head and mounting flange respectively, when operating, due to the transition of flexible damping pull bar, can be subtracted
The vibration that few refrigeration machine reciprocating motion of the pistons is produced by mounting flange to Systematic Communication, so as to reach the effect of damping.
4th, iron yoke magnet iron yoke is both the flux circuit of nmr magnet, is the base of equipment again, is weighed very much.In vibration
, can be by the way that mounting flange be installed because the quality of increase object can reduce its amplitude in the case of power constant
Onto magnet iron yoke, the amplitude of mounting flange is reduced by increasing the quality of vibrating object.Meanwhile, in mounting flange and magnet
Iron yoke and between install Z springs additional as level Four shock-absorption device, the Z springs have good elastic and good rigidity, can be further
Absorb the vibrational energy from refrigeration machine so that influence of the vibration of mounting flange 4 to system is minimized.
5th, the utility model damping overcomes causes to obtain nuclear magnetic resonance figures in the prior art because freezing machine vibration
The problem of being affected as quality, high-quality nuclear magnetic resonance image is obtained by controlling to cut off the propagation of vibration.
Brief description of the drawings
Fig. 1 is the structure sectional view of the utility model embodiment；
Fig. 2 is partial enlarged drawing at the A of the utility model embodiment.
In figure：Refrigeration machine 1, cold screen 2, vacuum tank 3, mounting flange 4, one-level damping device 5, zero pressure difference bellows 6,
One thin-wall corrugated tube 7, the second thin-wall corrugated tube 8, one-level cold head 9, two-step buffer 10, shock absorption trolley 11, flexible member 12,
Three-level damping device 13, connector 17, installing plate 15, upper copper flange 16, lower copper flange 14, magnet iron yoke 18, level Four damping dress
Put the 19, the 2nd Z springs mounting screw 20, Z springs 21, the first Z springs mounting screw 22, low-temperature (low temperature) vessel 23, the first sleeve 24, the 3rd thin-walled
Bellows 25, the conduction cooling copper cash 26 with shock-absorbing function, pipe connections 27, first level connecting plate 28, the second horizontal connecting plate
29th, longitudinally connected pipe 30, second sleeve 31.
Embodiment
With reference to the accompanying drawings and examples, embodiment of the present utility model is described in further detail.Below
Embodiment is used to illustrate the utility model, but is not limited to scope of the present utility model.
Embodiment 1
As shown in Figure 1 and Figure 2, the damping for a kind of NMR imaging device that the present embodiment is provided, including refrigeration
Machine 1, cold screen 2, vacuum tank 3, the vacuum tank 3 are socketed on refrigeration machine 1, are set between the refrigeration machine 1 and vacuum tank 3
There is mounting flange 4, the lower end of mounting flange 4 is provided with one-level damping device 5, the one-level damping device 5 includes zero-pressure
Poor bellows 6, the zero pressure difference bellows 6 is socketed on the wall of the vacuum tank 3, and the zero pressure difference bellows 6
Upper end be connected with the mounting flange 4, the zero pressure difference bellows 6 be the first thin-wall corrugated tube 7, the first thin-walled ripple
The upper end of pipe 7 is welded with the lower end of mounting flange 4, and the second thin-wall corrugated tube 8 is arranged with first thin-wall corrugated tube 7, and this
The cavity of the inner side of two thin-wall corrugated tube 8 is connected with the cavity of the inner side of the first thin-wall corrugated tube 7, second thin-wall corrugated tube
The lower end of 8 upper end and first thin-wall corrugated tube 7 is by setting pipe connections 27 to be connected.The pipe connections 27 include according to
First level connecting plate 28, the horizontal connecting plate 29 of longitudinally connected pipe 30 and second, the first level connecting plate of secondary connection
28 are set in the upper end periphery of the second thin-wall corrugated tube 8, and the lower end of the first thin-wall corrugated tube 7 passes through the second horizontal connecting plate 29
On the wall for being arranged on vacuum tank 3, the longitudinally connected pipe 30 then connects first level connecting plate 28 and the second level respectively
Certain gap is left between connecting plate 29, the longitudinally connected thin-wall corrugated tube 7 of pipe 30 and first.
Two-step buffer 10, institute are provided between one-level cold head 9 and the mounting flange 4 on the refrigeration machine 1
Flexible member 12 of the two-step buffer 10 by shock absorption trolley 11 and positioned at the one end of shock absorption trolley 11 is stated to constitute.
Three-level damping device 13 is provided between one-level cold head 9 on the cold screen 2 and the refrigeration machine 1, the three-level subtracts
Shake device 13 includes upper copper flange 16, lower copper flange 14, installing plate 15 and is arranged on the upper copper flange 16 and lower copper flange
Between 14 and with shock-absorbing function conduction cooling copper cash 26；The upper copper flange 16 be set on one-level cold head 9 and with one-level cold head 9
It is in close contact；The installing plate 15 is fixed on cold screen 2, and the upper copper flange 16 is set on one-level cold head 9 and cold with one-level
First 9 are in close contact, and the lower copper flange 14 is fixed on installing plate 15.By even between the installing plate 15 and lower copper flange 14
Fitting 17 is connected, and the connector 17 is preferably by bolt；The installing plate is preferably by aluminium sheet.It is described that there is damping work(
The length of the conduction cooling copper cash 26 of energy is more than or equal to 1.5 times of minimum range between upper copper flange 16 and lower copper flange 14.
The periphery of vacuum tank 3 is provided with magnet iron yoke 18, and level Four is provided between the magnet iron yoke 18 and mounting flange 4
Damping device 19, is provided with elastic connecting device between the magnet iron yoke 18 and the mounting flange 4, constitute the level Four damping
Device 19.Described elastic connecting device one end connects the magnet iron yoke 18, and the other end connects the mounting flange 4, described four
Level damping device 19 includes the first Z springs mounting screw 22, the Z springs mounting screw 20 of Z springs 21 and the 2nd, and described one end of Z springs 21 passes through
First Z springs mounting screw 22 is fixed on mounting flange 4, and the other end of Z springs 21 is fixed on by the 2nd Z springs mounting screw 20
In magnet iron yoke 18.
The lower end of the refrigeration machine 1 is provided with low-temperature (low temperature) vessel 23, is covered between the one-level cold head 9 and cold screen 2 of the refrigeration machine 1
If the 3rd thin-wall corrugated tube 25, first sleeve 24, described are arranged between the one-level cold head 9 and cold screen 2 of the refrigeration machine 1
Three thin-wall corrugated tubes 25 are located in first sleeve 24 and are connected with lower copper flange 14.
The periphery that first sleeve 24 is set in the 3rd thin-wall corrugated tube 25 is used to support the 3rd thin-wall corrugated tube 25, rises
To the effect of the 3rd thin-wall corrugated tube 25 of support.The lower end of second thin-wall corrugated tube sets a second sleeve 31；Described second
The upper end of sleeve 31 is connected with the lower end of the second thin-wall corrugated tube 8, lower end be connected with lower copper flange 14 and by lower copper flange with
Cold screen connection.
The low-temperature (low temperature) vessel is used to accommodate liquid helium, is the low-temperature receiver supplier of whole system.Wherein, the first thin-walled ripple
The upper end of pipe 7 is directly welded at the lower end of mounting flange 4；First thin-wall corrugated tube 7, second thin-wall corrugated tube of radius ratio 8 is big,
And it is set in the periphery of the second thin-wall corrugated tube 8；Between the thin-wall corrugated tube 8 of first thin-wall corrugated tube 7 and second
Pipe connections include first level connecting plate 28, the second horizontal connecting plate 29 and longitudinally connected pipe 30；Therefore the first thin-walled ripple
The outside of pipe 7 is 1 atmospheric pressure, and inside is the cavity communicated with low-temperature (low temperature) vessel 23, and the chamber pressure is also 1 atmospheric pressure, because
No pressure is poor inside and outside this first thin-wall corrugated tube 7, thus bellows is in unstress state because not bearing external force, is stretched axially
Contracting freely, operationally, can effectively absorb the partial vibration energy of mounting flange 4.
The pipe connections 27 include (i.e. the first thin-wall corrugated tube 7) lower end of connection zero pressure difference bellows 6 and the second thin-walled
Dividing plate between the upper end of bellows 8.Pipe connections 27 connect the first thin-wall corrugated tube 7 with the second thin-wall corrugated tube 8, make
The inner side cavity for obtaining the first thin-wall corrugated tube 7 is connected with the inner side cavity of the second thin-wall corrugated tube 8.The shape of the pipe connections 27
Shape can be formed as one, or segmental structure.The present embodiment is used as a preferred embodiment, the pipe connections 27
Using segmental structure.
One end of shock absorption trolley 11 in above-mentioned sets flexible member 12；The flexible member 12 is flexible and buffering work(
The spring of energy, shock absorption trolley 11 is fixed with one-level cold head 9 and mounting flange 4 respectively, when operating, due to flexible damping pull bar 11
Transition, can reduce refrigeration machine reciprocating motion of the pistons generation vibration be delivered to mounting flange, so as to reach control Vibration propagation
Effect.
Magnet iron yoke 18 in above-mentioned is both the flux circuit of nmr magnet, is the base of equipment again, is weighed very much.Cause
Quality for increase object can reduce its amplitude, can reduce peace by the way that mounting flange 4 is installed in magnet iron yoke 18
Fill the amplitude of flange 4.Meanwhile, mounting flange 4 and magnet iron yoke 18 and between install Z springs 21 additional as level Four shock-absorption device, the Z
Spring 21 has good elastic and good rigidity, can further absorb the vibrational energy from refrigeration machine so that Method for Installation
Influence of the vibration of orchid 4 to system is minimized.
Embodiment 2
As shown in Figure 1 and Figure 2, a kind of damping of NMR imaging device, including refrigeration machine 1, cold screen 2, vacuum are held
Device 3, the vacuum tank 3 is socketed on refrigeration machine 1, and mounting flange 4 is provided between the refrigeration machine 1 and vacuum tank 3, described
Three-level damping device 13 is provided between one-level cold head 9 on cold screen 2 and the refrigeration machine 1, the three-level damping device 13 includes
Upper copper flange 16, lower copper flange 14, installing plate 15 and it is arranged between the upper copper flange 16 and lower copper flange 14 and has
The conduction cooling copper cash 26 of shock-absorbing function；The upper copper flange 16 is set on one-level cold head 9 and is in close contact with one-level cold head 9；Institute
State installing plate 15 to be fixed on cold screen 2, the upper copper flange 16 is set on one-level cold head 9 and is in close contact with one-level cold head 9,
The lower copper flange 14 is fixed on installing plate 15.Connected between the installing plate 15 and lower copper flange 14 by connector 17,
The connector 17 is preferably by bolt；The installing plate is preferably by aluminium sheet.The conduction cooling copper with shock-absorbing function
The length of line 26 is more than or equal to 1.5 times of minimum range between upper copper flange 16 and lower copper flange 14.
It is provided with upper copper flange 16, lower copper flange 14 and installing plate 15, the upper copper between cold screen 2 and one-level cold head 9
Flange 16 is set on one-level cold head 9 and is in close contact with one-level cold head 9, and the lower copper flange 14 is fixed on installing plate 15,
The conduction cooling copper cash 26 with shock-absorbing function is provided between the upper copper flange 16 and lower copper flange 14, meanwhile, there should be damping work(
The length of the conduction cooling copper cash 26 of energy is more than or equal to 1.5 times of minimum range between upper copper flange 16 and lower copper flange 14, works as system
One-level cold head 9 in cold 1 to cold screen 2 conduct cold when, one-level cold head 9 can be effectively eliminated to the vibration produced by cold screen 2.
Embodiment 3
As shown in Figure 1 and Figure 2, a kind of damping of NMR imaging device, including refrigeration machine 1, cold screen 2, vacuum are held
Device 3, the vacuum tank 3 is socketed on refrigeration machine 1, and mounting flange 4 is provided between the refrigeration machine 1 and vacuum tank 3, described
The periphery of vacuum tank 3 is provided with magnet iron yoke 18, and level Four damping device 19 is provided between the magnet iron yoke 18 and mounting flange 4,
Elastic connecting device is provided between the magnet iron yoke 18 and mounting flange 4, the level Four damping device 19 is constituted；The elasticity
Attachment means one end connects the magnet iron yoke 18, and the other end connects the mounting flange 4.The level Four damping device 19 includes
First Z springs mounting screw 22, the Z springs mounting screw 20 of Z springs 21 and the 2nd, described one end of Z springs 21 passes through the first Z springs mounting screw 22
It is fixed on mounting flange 4, the other end of Z springs 21 is fixed in magnet iron yoke 18 by the 2nd Z springs mounting screw 20.It is described
The lower end of refrigeration machine 1 is provided with low-temperature (low temperature) vessel 23, and the 3rd thin-walled ripple is arranged between the one-level cold head 9 and cold screen 2 of the refrigeration machine 1
Line pipe 25, is arranged first sleeve 24, the 3rd thin-wall corrugated tube between the one-level cold head 9 and cold screen 2 of the refrigeration machine 1
25 are located in first sleeve 24 and are connected with lower copper flange 14.
Magnet iron yoke 18 is both the flux circuit of nmr magnet, is the base of equipment again, is weighed very much.Because increasing thing
The quality of body can reduce its amplitude, can reduce mounting flange 4 by the way that mounting flange 4 is installed in magnet iron yoke 18
Amplitude.Meanwhile, mounting flange 4 and magnet iron yoke 18 and between install Z springs 21 additional as level Four shock-absorption device, the Z springs 21 have
Good elastic and good rigidity, can further absorb the vibrational energy from refrigeration machine so that the vibration of mounting flange 4
Influence to system is minimized.
Embodiment 4
As shown in Figure 1 and Figure 2, a kind of damping of NMR imaging device, including refrigeration machine 1, cold screen 2, vacuum are held
Device 3, magnet iron yoke 18, the vacuum tank 3 are socketed on refrigeration machine 1, provided with peace between the refrigeration machine 1 and vacuum tank 3
Flange 4 is filled, the magnet iron yoke 18 is located at the periphery of vacuum tank 3.The lower end of mounting flange 4 is provided with one-level damping device
5, two-step buffer 10, the cold screen 2 and institute are provided between the one-level cold head 9 and the mounting flange 4 on the refrigeration machine 1
State and three-level damping device 13 is provided between one-level cold head 9, subtract between the magnet iron yoke 18 and the mounting flange 4 provided with level Four
Shake device 19.
It, which is used, is arranged on the one-level damping device 5 of the lower end of mounting flange 4, between one-level cold head 9 and mounting flange 4
Two-step buffer 10, three-level damping device 13 between the cold screen 2 and the one-level cold head 9 and positioned at magnet iron
Level Four damping device 19 between yoke 18 and mounting flange 4, the damping that four damping devices are combined, operationally,
By the mutual coordinated of aforementioned four damping device, its damping effect is so enhanced, also causes image definition stability
Significantly improve.
Because in the prior art, the refrigeration machine of nmr magnet can produce mechanical oscillation, and this mechanical oscillation are systems
Piston in cold cylinder moves axially in reciprocal fashion caused.Because refrigeration machine is connected on magnet, the propagation of vibration causes
Whole magnet carries out mechanical oscillation together so that obtains high-quality nuclear magnetic resonance image and is affected, in order to eliminate this influence
The propagation of vibration will be controlled, being present embodiments provided for this kind of can overcome refrigeration machine in the prior art to produce lacking for vibration
Fall into, so that the damping machine of the NMR imaging device of the stability of the image definition to improve magnetic resonance imaging device
Structure；Meanwhile, it also has the advantages that：
1st, it is simple in construction, using level Four damping, and by level Four damping coordinated, so enhance its damping effect
Really, also image definition stability is significantly improved；
2nd, constituted using one-level damping device 5, two-step buffer 10, three-level damping device 13, level Four damping device 19
Damping, its one-level damping device 5 is by the setting of zero pressure difference bellows 6, and making bellows, no pressure is poor in this configuration,
So with elasticity well, so as to filter out vibration of the mounting flange 4 to magnet vacuum tank 3, two-step buffer
10 are, by using flexible draw bar, the cold head of mounting flange 4 and one is not produced excessive resonance and is reached damping, three-level damping
Device 13 is then that level Four damping device 19 is using Z springs 21, its Z spring 21 in order to eliminate the influence that one-level cold head 9 vibrates to cold screen 2
, can be with Vibration propagation of the absorption refrigerating machine 1 by mounting flange 4 with good elasticity；
3rd, one end of shock absorption trolley 11 sets flexible member 12；The flexible member 12 is the flexible bullet with pooling feature
Spring, shock absorption trolley 11 is fixed with one-level cold head 9 and mounting flange 4 respectively, when operating, due to the mistake of flexible damping pull bar 11
Cross, the vibration that can reduce the generation of refrigeration machine reciprocating motion of the pistons is delivered to mounting flange, so as to reach the effect of damping；
4th, magnet iron yoke 18 is both the flux circuit of nmr magnet, is the base of equipment again, is weighed very much.Because increase
The quality of object can reduce its amplitude, can reduce mounting flange 4 by the way that mounting flange 4 is installed in magnet iron yoke 18
Amplitude.Meanwhile, mounting flange 4 and magnet iron yoke 18 and between install Z springs 21 additional as level Four shock-absorption device, the Z springs 21 have
There is good elastic and good rigidity, can further absorb the vibrational energy from refrigeration machine so that mounting flange 4 shakes
The dynamic influence to system is minimized.
Described above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
For art personnel, on the premise of the utility model technical principle is not departed from, some improvements and modifications can also be made, these change
Enter and retouch and also should be regarded as protection domain of the present utility model.
Claims (10)
1. a kind of damping of NMR imaging device, including refrigeration machine (1), cold screen (2), vacuum tank (3), described true
Empty container (3) is socketed on refrigeration machine (1), and mounting flange (4) is provided between the refrigeration machine (1) and vacuum tank (3), and it is special
Levy and be, the mounting flange (4) lower end is provided with one-level damping device (5), the one-level damping device (5) includes zero-pressure
Poor bellows (6), the zero pressure difference bellows (6) is socketed on the vacuum tank (3), and the zero pressure difference bellows
(6) upper end is connected with the mounting flange (4).
2. a kind of damping of NMR imaging device according to claim 1, it is characterised in that the zero pressure difference
Bellows (6) is the first thin-wall corrugated tube (7), and upper end and mounting flange (4) lower end of first thin-wall corrugated tube (7) connect
Connect, be arranged with the second thin-wall corrugated tube (8) in first thin-wall corrugated tube (7), the chamber on the inside of second thin-wall corrugated tube (8)
Body is connected with the cavity on the inside of first thin-wall corrugated tube (7).
3. the damping of a kind of NMR imaging device according to claim 2, it is characterised in that described second is thin
The lower end of the upper end of wall bellows (8) and first thin-wall corrugated tube (7) is by setting pipe connections (27) to be connected.
4. a kind of damping of NMR imaging device according to claim 3, it is characterised in that the pipe connection
Part (27) includes first level connecting plate (28), longitudinally connected pipe (30) and the second horizontal connecting plate (29) being sequentially connected；
The first level connecting plate (28) is set in the upper end periphery of the second thin-wall corrugated tube (8), first thin-wall corrugated tube (7)
Lower end is arranged on the wall of vacuum tank (3) by the second horizontal connecting plate (29), and the longitudinally connected pipe (30) is then distinguished
Connect first level connecting plate (28) and the second horizontal connecting plate (29), the longitudinally connected pipe (30) and the first thin-wall corrugated tube
(7) certain gap is left between.
5. a kind of damping of NMR imaging device according to claim 1, it is characterised in that positioned at the refrigeration
Two-step buffer (10), two grades of dampings dress are provided between one-level cold head (9) and the mounting flange (4) on machine (1)
The flexible member (12) of (10) by shock absorption trolley (11) and positioned at shock absorption trolley (11) one end is put to constitute.
6. a kind of damping of NMR imaging device according to claim 1-5 any one, it is characterised in that
Three-level damping device (13) is provided between one-level cold head (9) on the cold screen (2) and the refrigeration machine (1), the three-level subtracts
Shake device (13) includes upper copper flange (16), lower copper flange (14), installing plate (15) and is arranged on the upper copper flange (16)
Between lower copper flange (14) and with shock-absorbing function conduction cooling copper cash (26)；The upper copper flange (16) is set in one-level cold head
(9) it is in close contact on and with one-level cold head (9)；The installing plate (15) is fixed on cold screen (2), upper copper flange (16) set
It is located on one-level cold head (9) and is in close contact with one-level cold head (9), the lower copper flange (14) is fixed on installing plate (15).
7. a kind of damping of NMR imaging device according to claim 6, it is characterised in that it is described have subtract
The length for shaking the conduction cooling copper cash (26) of function is more than or equal to minimum range between upper copper flange (16) and lower copper flange (14)
1.5 again.
8. the damping of a kind of NMR imaging device according to claim 6, it is characterised in that the vacuum is held
Device (3) periphery is provided with magnet iron yoke (18), and level Four damping device is provided between the magnet iron yoke (18) and mounting flange (4)
(19)。
9. a kind of damping of NMR imaging device according to claim 8, it is characterised in that the magnet iron yoke
(18) elastic connecting device is provided between the mounting flange (4), the level Four damping device (19) is constituted；The elasticity is even
Connection device one end connects the magnet iron yoke (18), and the other end connects the mounting flange (4).
10. a kind of damping of NMR imaging device according to claim 8, it is characterised in that the level Four subtracts
Shaking device (19) includes the first Z springs mounting screw (22), Z springs (21) and the 2nd Z springs mounting screw (20), the Z springs (21) one
End is fixed on mounting flange (4) by the first Z springs mounting screw (22), and Z springs (21) other end is installed by the 2nd Z springs
Screw (20) is fixed in magnet iron yoke (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621320326.3U CN206478160U (en) | 2016-12-05 | 2016-12-05 | A kind of damping of NMR imaging device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621320326.3U CN206478160U (en) | 2016-12-05 | 2016-12-05 | A kind of damping of NMR imaging device |
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| Publication Number | Publication Date |
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| CN206478160U true CN206478160U (en) | 2017-09-08 |
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| CN201621320326.3U Withdrawn - After Issue CN206478160U (en) | 2016-12-05 | 2016-12-05 | A kind of damping of NMR imaging device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106763469A (en) * | 2016-12-05 | 2017-05-31 | 宁波健信核磁技术有限公司 | A kind of damping of NMR imaging device |
| CN107806736A (en) * | 2017-12-12 | 2018-03-16 | 合肥中科离子医学技术装备有限公司 | A kind of independently detachable formula mechanism for refrigeration machine installation |
| CN107993788A (en) * | 2017-12-15 | 2018-05-04 | 上海联影医疗科技有限公司 | Superconducting magnet system, its control method, its manufacture method and magnetic resonance system |
| CN114688205A (en) * | 2020-12-31 | 2022-07-01 | 北京科益虹源光电技术有限公司 | Vibration isolation structure and impeller rotor system for laser |
-
2016
- 2016-12-05 CN CN201621320326.3U patent/CN206478160U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106763469A (en) * | 2016-12-05 | 2017-05-31 | 宁波健信核磁技术有限公司 | A kind of damping of NMR imaging device |
| CN106763469B (en) * | 2016-12-05 | 2019-06-18 | 宁波健信核磁技术有限公司 | A kind of damping of NMR imaging device |
| CN107806736A (en) * | 2017-12-12 | 2018-03-16 | 合肥中科离子医学技术装备有限公司 | A kind of independently detachable formula mechanism for refrigeration machine installation |
| CN107993788A (en) * | 2017-12-15 | 2018-05-04 | 上海联影医疗科技有限公司 | Superconducting magnet system, its control method, its manufacture method and magnetic resonance system |
| CN107993788B (en) * | 2017-12-15 | 2020-05-19 | 上海联影医疗科技有限公司 | Superconducting magnet system, control method thereof, manufacturing method thereof, and magnetic resonance system |
| CN114688205A (en) * | 2020-12-31 | 2022-07-01 | 北京科益虹源光电技术有限公司 | Vibration isolation structure and impeller rotor system for laser |
| CN114688205B (en) * | 2020-12-31 | 2023-08-29 | 北京科益虹源光电技术有限公司 | Vibration isolation structure and impeller rotor system for laser |
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