CN207666995U - Medical computerized linear accelerator thyratron filament is classified preheating device - Google Patents
Medical computerized linear accelerator thyratron filament is classified preheating device Download PDFInfo
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- CN207666995U CN207666995U CN201720657779.3U CN201720657779U CN207666995U CN 207666995 U CN207666995 U CN 207666995U CN 201720657779 U CN201720657779 U CN 201720657779U CN 207666995 U CN207666995 U CN 207666995U
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- thyratron
- filament
- power supply
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- linear accelerator
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Abstract
The utility model is related to a kind of thyratron filament preheating devices, it is classified preheating device more particularly to a kind of medical computerized linear accelerator thyratron filament, including power supply and thyratron, power supply passes through voltage-stablizer and transformer successively, and it is connected with the feeder ear of thyratron, electric current loop is set on the outside of the filament of thyratron, the voltage output end access differential rectification circuit of electric current loop, enter controller after the filtering of difference rectifier circuit rectifies, the outer contact relay of controller, relay includes two groups of contacts, and is accessed between power supply and voltage-stablizer；The utility model makes the performance of thyratron is more stable, exports relatively reliable, service life more to lengthen, and medical computerized linear accelerator output dose is more stablized.
Description
Technical field
The utility model is related to a kind of thyratron filament preheating devices, and in particular to a kind of medical computerized linear accelerator lock
Flow tube filament is classified preheating device.
Background technology
Thyratron is the important composition component of medical computerized linear accelerator, concerning going out to medical computerized linear accelerator
Beam stability.Currently, medical computerized linear accelerator and not with classification pre-heating system, but directly give total head preheat, by
In the impedance operator of thyratron, 20 seconds after powering on, impedance can change from small to big until stabilization, directly give total head preheating meeting
Cause thyratron damage, service life are reduced, trigger pulse is unstable, the output of medical computerized linear accelerator dosage is unstable etc.
Problem.
Utility model content
In order to solve the above-mentioned technical problem the deficiency in, the purpose of this utility model is that：It is straight to provide a kind of medical electric
Line accelerator thyratron filament is classified preheating device, can be that the filament of thyratron carries out classification preheating.
The utility model is that technical solution used by solving its technical problem is：
The medical computerized linear accelerator thyratron filament is classified preheating device, including power supply and thyratron, power supply according to
It is secondary to pass through voltage-stablizer and transformer, and be connected with the feeder ear of thyratron, electric current loop, electric current are set on the outside of the filament of thyratron
The voltage output end access differential rectification circuit of ring enters controller, outside controller after the filtering of difference rectifier circuit rectifies
Contact relay, relay includes two groups of contacts, and is accessed between power supply and voltage-stablizer.
When work, power supply electrifying, transformer has two voltage output patterns of height, special after being powered according to thyratron filament
Property, being first passed through the rated voltage of half for it is preheated, and controller control transformer is operated in low-voltage output pattern to lock
The filament pre-heating of flow tube, electric current loop acquire the heater current variation of thyratron, and are converted into voltage, after difference rectification circuit
Controller is entered, after waiting thyratrons heater current to stablize, control relay is attracted, and it is high voltage to allow transformer to be operated in no-load voltage ratio
Under output mode, with rated voltage to the filament pre-heating of thyratron.
Further preferably, power supply is 220V power supplys.
Further preferably, transformer has two voltage output patterns of height.
Compared with prior art, the utility model has the advantages that：
The utility model makes the performance of thyratron is more stable, exports relatively reliable, service life more to lengthen, medical electric
Linear accelerator output dose is more stablized.
Description of the drawings
Fig. 1 the utility model flow diagrams；
Fig. 2 the utility model electrical schematic diagrams.
In figure：1, relay；2, voltage-stablizer；3, transformer；4, thyratron；5, electric current loop；6, difference rectification circuit；7, it controls
Device processed.
Specific implementation mode
The utility model embodiment is described further below in conjunction with the accompanying drawings：
Embodiment 1
As shown in Figs. 1-2, medical computerized linear accelerator thyratron filament described in the utility model is classified preheating device, packet
Include power supply and thyratron 4, power supply is 220V power supplys, and power supply passes through voltage-stablizer 2 and transformer 3 successively, and with the power supply of thyratron 4
End is connected, and voltage-stablizer 2 can effectively inhibit filament voltage power supply deviation, and electric current loop 5, electricity are set on the outside of the filament of thyratron 4
The voltage output end access differential rectification circuit 6 for flowing ring 5 enters controller 7, control after 6 rectifying and wave-filtering of difference rectification circuit
7 outer contact relay 1 of device processed, relay 1 includes two groups of contacts, and is accessed between power supply and voltage-stablizer 2.
The sampling of 4 filament voltage of thyratron is directly carried out by electric current loop 5, avoids introducing to system using electric resistance partial pressure pattern
Interference.
It is converted by difference rectification circuit 6, interference signal metering-in control system can be avoided.
Control system monitors the variation of 4 heater current of thyratron in real time, switches voltage immediately after stablizing, control accuracy reaches
100 milliseconds, system is made to be responded faster.
The operation principle of the utility model：
When work, power supply electrifying, transformer 3 has two voltage output patterns of height, special after being powered according to 4 filament of thyratron
Property, being first passed through the rated voltage of half for it is preheated, controller 7 control transformer 3 be operated in low-voltage output pattern to
The filament pre-heating of thyratron 4, electric current loop 5 acquire the heater current variation of thyratron 4, and are converted into voltage, by difference rectification
Controller 7 is entered after circuit 6, after waiting 4 heater current of thyratrons to stablize, control relay 1 is attracted, and transformer 3 is allowed to be operated in
No-load voltage ratio is under high voltage output mode, with rated voltage to the filament pre-heating of thyratron 4.
Claims (3)
1. a kind of medical computerized linear accelerator thyratron filament is classified preheating device, including power supply and thyratron (4), power supply according to
It is secondary to pass through voltage-stablizer (2) and transformer (3), and be connected with the feeder ear of thyratron (4), which is characterized in that thyratron (4)
Suit electric current loop (5), the voltage output end access differential rectification circuit (6) of electric current loop (5), by difference rectified current on the outside of filament
Entering controller (7), controller (7) outer contact relay (1) after road (6) rectifying and wave-filtering, relay (1) includes two groups of contacts, and
It accesses between power supply and voltage-stablizer (2).
2. medical computerized linear accelerator thyratron filament according to claim 1 is classified preheating device, which is characterized in that
Power supply is 220V power supplys.
3. medical computerized linear accelerator thyratron filament according to claim 1 is classified preheating device, which is characterized in that
Transformer (3) has two voltage output patterns of height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720657779.3U CN207666995U (en) | 2017-06-07 | 2017-06-07 | Medical computerized linear accelerator thyratron filament is classified preheating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720657779.3U CN207666995U (en) | 2017-06-07 | 2017-06-07 | Medical computerized linear accelerator thyratron filament is classified preheating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207666995U true CN207666995U (en) | 2018-07-31 |
Family
ID=62952846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720657779.3U Active CN207666995U (en) | 2017-06-07 | 2017-06-07 | Medical computerized linear accelerator thyratron filament is classified preheating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207666995U (en) |
-
2017
- 2017-06-07 CN CN201720657779.3U patent/CN207666995U/en active Active
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