CN104655887B - Electrometer sealing system - Google Patents
Electrometer sealing system Download PDFInfo
- Publication number
- CN104655887B CN104655887B CN201510084883.3A CN201510084883A CN104655887B CN 104655887 B CN104655887 B CN 104655887B CN 201510084883 A CN201510084883 A CN 201510084883A CN 104655887 B CN104655887 B CN 104655887B
- Authority
- CN
- China
- Prior art keywords
- electrometer
- hole
- installation
- shielding box
- circuit module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The present invention relates to electrometer sealing and anti-interference field, a kind of electrometer sealing system is provided, to solve the problems, such as current electrometer screen method poor reliability, assembling is cumbersome, cost is high, and the system includes electrometer circuit module, printed board, sealing ring, mask frame, open-topped shielding box.Technical scheme cost proposed by the present invention is low, simple and convenient, reliability is high.
Description
Technical field
The present invention relates to electrometer sealing and anti-interference field, more particularly to a kind of electrometer sealing system.
Background technology
Since ray is found, the fields such as medical treatment, industry, agricultural have been widely used in it.It is with the development of science and technology and existing
For the change of life style, the mankind add many radiation exposed new contents, for example, phosphate fertilizer use cause irradiation caused by food,
Building materials radiation, people are rationally mankind's health service etc. using Ionizing Radiation in house.Development and demand with technology
It has developed a variety of artificial radioactive sources, such as medical diagnosis radiation source (CT radiation sources), medical accelerator, cobalt-60 therapy machine, rear dress
Various radio isotopes of therapy apparatus and Nuclear medicine etc..Radiodiagnosis equipment medical diagnostic X-ray unit has popularized me at present
Villages and towns in rural areas hospital of state, Medical CT machine also spread to local level hospital of county, enormous amount, and many County Hospitals also equipped with radiation
Therapy apparatus, there are the substantial amounts of common people to receive radiodiagnosis inspection or radiation treatment daily, the value of kind equipment output directly closes
It is the health and safety to the common people.
Dosimeter is a kind of measuring apparatus for measuring ray output dose size, can with Accurate Determining radiodiagnosis inspection or
The output quantity of radiation treatment, medical personnel can design or change inspection scheme or therapeutic scheme by the amount, reach
While radiodiagnosis or the effect of radiation therapy, clients or the radiation exposed amount of patient are reduced, it is ensured that the peace of clients or patient
Entirely with health.The core component of dosimeter is Weak current measurement unit-electrometer, and electrometer is used to measure small and weak electric current letter
Number, small electric signal is converted to conventional measurable electric signal by it.This signal very little of electrometer measurement, can be as little as
10-14A, therefore directly can not be measured with a/d converter etc., and common amplifier can not also carry out signal transacting to it, place
Reason unit needs high input impedance and ultralow bias current, and conventional measuring part is difficult to the so small letter of measurement
Number, the low current signal is converted into voltage signal usually using electrometer, so that the measuring unit of routine being capable of direct measurement.
Due to electrometer processing electric signal it is minimum, be easy to disturbed, it is therefore desirable to using special low noise screened cable by its
Electrometer is introduced, while electrometer local environment palpus itself is clean, dries, possesses good electromagnetic shielding, is inputted to keep high
Impedance, reduce electromagnetic interference, it is ensured that it has the background current of low stabilization, avoids dust, humidity from causing under input impedance
Drop, increases unwanted background current, thus, electrometer is necessarily mounted in shielding box, to reduce electromagnetic interference, and meanwhile it is necessary
The sealing having had, to ensure that electrometer subenvironment is clean, dries.In addition, electrometer need of work power supply, and under the control of outside
The measurement of complete pair signals and the processing (processing of such as background current, the adjustment of multiplication factor etc.) of signal, the letter of preliminary treatment
Number must be output to outside further processes, and is such as converted to data signal, is handled through micro controller and show or upload to and be upper
Machine etc..Because these connecting lines must pass through shielding box, therefore on the one hand to ensure the reliability of connecting line, another aspect connecting line
Connected mode should not influence sealing effectiveness, and in subsequent use, connected mode should not result in the failure of sealing.
Conventional electrometer closed shield method has two kinds at present：First method is that electrometer plate is fixed on into a shielding
In box, box interior power, control line, output signal line are connected with the socket on box by patchcord, then pass through plug
It is connected to mainboard；Second method is that shielding box is divided into two parts up and down, and electrometer plate is placed between two parts, on electrometer plate
Device in shielding box, between the top of shielding box and electrometer plate, between the bottom of shielding box and electrometer plate respectively
Seal is encrypted, is finally fastened upper two parts of shielding box and lower part with screw, and then seals the effect of electrometer, its
Box interior power, control line, output signal line are drawn by exceeding the region of shielding box on plate, then by connector by itself and mainboard
It is connected.
Above-mentioned electrometer screen method has the following disadvantages：
(1) global reliability is poor：Due to mainboard being connected with electrometer plate by plugs and sockets and connector, the company of increasing
Wiring faults probability, while socket may bring sealing to be deteriorated or fail in sealing or in；
(2) assemble cumbersome：The assembling of shielding box and fixed work order are more, it is necessary to install plugs and sockets, connector, and sealing is inserted
Seat, fixed electrometer plate etc.；
(3) cost is high：Due to the use of socket, shielding box processing cost is added, and needs to buy plugs and sockets, connect
Plug-in unit etc. connects mainboard and electrometer plate, while increases line in assembly cost or follow-up use and seal bad bring
Use cost.
The present invention is national major scientific instruments and equipment development special fund Funded Projects (project name：New ionization spoke
Penetrate detecting instrument and critical component exploitation and application, bullets：2013YQ090811).
The content of the invention
【Technical problems to be solved】
It is an object of the invention to provide a kind of electrometer sealing system, to solve current electrometer screen method reliability
The problem of difference, cumbersome, cost is high assembling.
【Technical scheme】
The present invention is achieved by the following technical solutions.
The present invention relates to a kind of electrometer sealing system, and it includes electrometer circuit module, printed board, sealing ring, shielding
Frame, open-topped shielding box, the electrometer circuit module are arranged on the upper surface of printed board, the electrometer circuit module
It is connected with the printed circuit in printed board, the shielding box is opening down to be covered electrometer circuit module and be fixedly mounted on printing
On plate, the mask frame is fixedly mounted on the bottom surface of printed board, and the central point of the mask frame and the central point of shielding box exist
Same vertical direction, the sealing ring are arranged between printed board and shielding box, and the height of the shielding box is more than electrometer electricity
The height of component in the module of road.
As a preferred embodiment, the electrometer sealing system also includes fastener, set on the shielding box
The first installation through-hole is equipped with, the printed board is provided with the second installation through-hole in position corresponding with the first installation through-hole, described
Sealing ring is provided with the 3rd installation through-hole in position corresponding with the first installation through-hole, the mask frame with the second installation through-hole
Corresponding position is provided with the 4th installation through-hole, and the fastener sequentially passes through the 4th installation through-hole, the second installation through-hole, the 3rd
Installation through-hole and the first installation through-hole, which coordinate, to be installed.
As another preferred embodiment, first installation through-hole, the second installation through-hole, the 3rd installation through-hole,
The number of 4th installation through-hole is 4, and first installation through-hole is separately positioned on four corners of shielding box.
As another preferred embodiment, the fastener is trip bolt, and first installation through-hole is screw thread
Hole.
As another preferred embodiment, the printed circuit includes the power supply for the power supply of electrometer circuit module
Line, the control line of control electrometer circuit module measurement and the output line for electrometer circuit module signal output.
As another preferred embodiment, the side wall thickness of the shielding box is more than or equal to 4mm, the mask frame
Side wall thickness is more than or equal to the side wall thickness of shielding box.
As another preferred embodiment, the height of the shielding box is at least than highest member on electrometer circuit module
The big 5mm of height of device.
As another preferred embodiment, the shielding box, mask frame, the shape size all same of sealing ring.
As another preferred embodiment, being shaped as the shielding box is square.
As another preferred embodiment, the material of the shielding box is aluminium.
【Beneficial effect】
Technical scheme proposed by the present invention has the advantages that：
(1) hole for mounting receptacle, while shielding box and electrometer circuit need not be processed on shielding box of the invention
Connection between module is without using connector, in addition to material cost is reduced, also improves reliability, reduces the later stage and use and tie up
Protect cost；
(2) shielding box and mask frame are directly fixed in printed board by the present invention using screw, without fixed mask respectively
Box and electrometer circuit module, and without using plugs and sockets and connector, eliminate the installation of plugs and sockets and connector
And welding, therefore encapsulating method provided by the invention is simpler；
(3) power line of electrometer circuit module, control line and output signal line are direct by printed circuit in the present invention
Other circuit modules of printed board are connected to, reduce the failure factor of plugs and sockets and connector connect band, meanwhile, the present invention
Without using plugs and sockets and connector, the influence to sealing effectiveness during plugs and sockets poor sealing and use is reduced.
Brief description of the drawings
Fig. 1 is the electrometer circuit module that embodiments of the invention provide and the structural representation of printed board.
Fig. 2 is the structural representation for the shielding box that embodiments of the invention provide.
Fig. 3 is the structural representation for the mask frame that embodiments of the invention provide.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, to the specific of the present invention
Embodiment carries out clear, complete description, it is clear that and described embodiment is the part of the embodiment of the present invention, rather than
Whole embodiments, nor limitation of the present invention.Based on embodiments of the invention, those of ordinary skill in the art are not paying
The every other embodiment obtained under the premise of creative work, belongs to protection scope of the present invention.
The embodiment of the present invention provides a kind of electrometer sealing system, and Fig. 1 to Fig. 3 is the structure of the sealing system various pieces
Schematic diagram, wherein Fig. 1 are the electrometer circuit module that embodiments of the invention provide and the structural representation of printed board, and Fig. 2 is
The structural representation for the shielding box that embodiments of the invention provide, Fig. 3 are the structure for the mask frame that embodiments of the invention provide
Schematic diagram.As shown in Figure 1 to Figure 3, the system is opened including electrometer circuit module 1, printed board 2, sealing ring, mask frame 3, top
The shielding box 4 of mouth, electrometer circuit module 1 include electrometer, and electrometer circuit module 1 is arranged on the upper surface of printed board 2, tool
Body, a certain piece of region of the upper surface of printed board 2 is used to set electrometer circuit module 1, in addition, electrometer circuit module 1
It is connected with the printed circuit 5 in printed board 2, the printed circuit 5 is attached with other circuit modules in printed board 2, shielding
Box 4 is opening down to be covered electrometer circuit module 1 and is fixedly mounted in printed board 2, and mask frame 3 is fixedly mounted on printed board 2
Bottom surface, the central point of mask frame 3 and the central point of shielding box 4 in same vertical direction, sealing ring be arranged on printed board 2 with
Between shielding box 4.
In the present embodiment, shielding box 4 is square aluminum box, and mask frame 3 is square aluminum frame, shielding box 4, sealing ring and mask frame
3 length and width all same.The side wall thickness of shielding box 4 is 5mm, and the side wall thickness of mask frame 3 is 6mm, the height of shielding box 4
Degree is bigger 6mm than the height of highest component on electrometer circuit module 1.
In the present embodiment, the first installation through-hole is provided with shielding box 4, the first installation through-hole includes installation through-hole 41, peace
Through hole 42, installation through-hole 43, installation through-hole 44 are filled, printed board 2 is provided with the second peace in position corresponding with the first installation through-hole
Fill through hole, the second installation through-hole include installation through-hole 21, installation through-hole 22, installation through-hole 23, installation through-hole 24, sealing ring with
Position corresponding to first installation through-hole is provided with the 3rd installation through-hole, and mask frame 3 is set in position corresponding with the second installation through-hole
The 4th installation through-hole is equipped with, the 4th installation through-hole includes installation through-hole 31, installation through-hole 32, installation through-hole 33, installation through-hole 34,
First installation through-hole is separately positioned on four corners of shielding box, and fastener sequentially passes through the 4th installation through-hole, the second installation is led to
Hole, the 3rd installation through-hole and the first installation through-hole, which coordinate, to be installed, and specifically, fastener is trip bolt, and the first installation through-hole is
Screwed hole, the second installation through-hole, the 3rd installation through-hole, the 4th installation through-hole are common via.
In the present embodiment, printed circuit 5 include for electrometer power supply power line, control electrometer measurement control line and
Output line for electrometer signal output.
As can be seen from the above embodiments, need not be processed for mounting receptacle on the shielding box in the embodiment of the present invention
Hole, while the connection between shielding box and electrometer circuit module in addition to material cost is reduced, also improves without using connector
Reliability, reduce later stage operation and maintenance cost；In addition, the embodiment of the present invention uses screw directly by shielding box and mask frame
It is fixed in printed board, without fixed mask box and electrometer circuit module respectively, and does not have to using plugs and sockets and patch
Part, the installation and welding of plugs and sockets and connector are eliminated, therefore encapsulating method provided by the invention is simpler；Finally, originally
In inventive embodiments, power line, control line and the output signal line of electrometer circuit module are directly connected to by printed circuit
Other circuit modules of printed board, reduce the failure factor of plugs and sockets and connector connect band, meanwhile, the present invention does not make
With plugs and sockets and connector, the influence to sealing effectiveness during plugs and sockets poor sealing and use is reduced.
Claims (8)
- A kind of 1. electrometer sealing system, it is characterised in that：It includes electrometer circuit module, printed board, sealing ring, shielding Frame, open-topped shielding box, the electrometer circuit module are arranged on the upper surface of printed board, the electrometer circuit module It is connected with the printed circuit in printed board, the shielding box is opening down to be covered electrometer circuit module and be fixedly mounted on printing On plate, the mask frame is fixedly mounted on the bottom surface of printed board, and the central point of the mask frame and the central point of shielding box exist Same vertical direction, the sealing ring are arranged between printed board and shielding box, and the height of the shielding box is more than electrometer electricity The height of component in the module of road, the system also include fastener, and the first installation through-hole is provided with the shielding box, described Printed board is provided with the second installation through-hole in position corresponding with the first installation through-hole, the sealing ring with the first installation through-hole Corresponding position is provided with the 3rd installation through-hole, and the mask frame is provided with the 4th peace in position corresponding with the second installation through-hole Through hole is filled, the fastener sequentially passes through the 4th installation through-hole, the second installation through-hole, the 3rd installation through-hole and the first installation through-hole Coordinate installation, the printed circuit includes the power line for the power supply of electrometer circuit module, control electrometer circuit module measurement Control line and output line for electrometer circuit module signal output, the power line of the electrometer circuit module, Control line and output signal line are attached directly to other circuit modules of printed board by printed circuit.
- 2. electrometer sealing system according to claim 1, it is characterised in that：First installation through-hole, the second installation Through hole, the 3rd installation through-hole, the number of the 4th installation through-hole are 4, and first installation through-hole is separately positioned on shielding box Four corners.
- 3. electrometer sealing system according to claim 1 or 2, it is characterised in that：The fastener is trip bolt, institute It is screwed hole to state the first installation through-hole.
- 4. electrometer sealing system according to claim 1, it is characterised in that the side wall thickness of the shielding box be more than etc. In 4mm, the side wall thickness of the mask frame is more than or equal to the side wall thickness of shielding box.
- 5. electrometer sealing system according to claim 1, it is characterised in that the height of the shielding box at least compares electrostatic Count the big 5mm of height of highest component on circuit module.
- 6. electrometer sealing system according to claim 1, it is characterised in that the shielding box, mask frame, sealing ring Shape size all same.
- 7. the electrometer sealing system according to claim 1 or 6, it is characterised in that being shaped as the shielding box is square.
- 8. electrometer sealing system according to claim 1, it is characterised in that the material of the shielding box is aluminium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510084883.3A CN104655887B (en) | 2015-02-16 | 2015-02-16 | Electrometer sealing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510084883.3A CN104655887B (en) | 2015-02-16 | 2015-02-16 | Electrometer sealing system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104655887A CN104655887A (en) | 2015-05-27 |
| CN104655887B true CN104655887B (en) | 2017-11-21 |
Family
ID=53247256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510084883.3A Active CN104655887B (en) | 2015-02-16 | 2015-02-16 | Electrometer sealing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104655887B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2309688Y (en) * | 1997-08-14 | 1999-03-03 | 东莞精恒电子有限公司 | Shielded box |
| IES991113A2 (en) * | 1998-12-22 | 2000-09-06 | Hi Key Ltd | A radio receiver |
| CN203101443U (en) * | 2013-01-06 | 2013-07-31 | 中国电子科技集团公司第四十一研究所 | Shielding structure of radio frequency testing circuit |
| CN204556678U (en) * | 2015-02-16 | 2015-08-12 | 四川中测辐射科技有限公司 | Electrometer sealing system |
-
2015
- 2015-02-16 CN CN201510084883.3A patent/CN104655887B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104655887A (en) | 2015-05-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Brown et al. | Coincidence electroproduction of charged pions and the pion form factor | |
| CN107422359A (en) | A kind of measuring method of the neutron gamma dosage based on liquid scintillation bulk detector | |
| CN105223599B (en) | A kind of online self diagnosis monitoring device of X-ray flat panel detector | |
| CN107146647A (en) | A kind of portable neutron detection device | |
| AU2014249831B2 (en) | Systems and methods for assaying an eluate for Technetium and Molybdenum content | |
| CN109655878A (en) | X/ γ dosemeter field calibration method based on x-ray source, radiation protecting systems | |
| CN111077487A (en) | Portable nuclear instrument system signal detection and fault positioning device | |
| CN104515781B (en) | X-ray inspection system | |
| CN205507100U (en) | Environment X, gamma dose rate measuring apparatu | |
| CN104655887B (en) | Electrometer sealing system | |
| CN204556678U (en) | Electrometer sealing system | |
| CN109490023A (en) | A kind of activity metering unit for the sampling of gas on-line continuous | |
| CN104516010B (en) | X-ray beam intensity monitoring device and X-ray inspection system | |
| CN204758834U (en) | Alpha particle measurement appearance | |
| CN206523642U (en) | Nuclear power exhaust treatment system radiation monitoring equipment | |
| CN207611149U (en) | A kind of β measuring devices based on anticoincidence technique | |
| CN206096480U (en) | Nuclear power station exhaust -gas treatment radiation monitoring system | |
| KR101212750B1 (en) | Radiation shielding devices and printed circuit board inspection apparatus having the same | |
| CN204439843U (en) | X-ray beam intensity of flow supervising device and X-ray inspection system | |
| CN209388233U (en) | A kind of cabinet main box, cabinet and flash detecting device | |
| US4912736A (en) | X-ray tomographic detector | |
| CN108693551B (en) | Probe and device for monitoring grade of uranium ore | |
| Nam et al. | Development and characterization of tissue equivalent proportional counter for radiation monitoring in international space station | |
| CN220323547U (en) | Medical linear accelerator ionization chamber dose monitoring device | |
| CN204989493U (en) | Pressurization ionization chamber survey monitor device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |