CN2203804Y - Laboratory safety electric power - Google Patents
Laboratory safety electric power Download PDFInfo
- Publication number
- CN2203804Y CN2203804Y CN 94238363 CN94238363U CN2203804Y CN 2203804 Y CN2203804 Y CN 2203804Y CN 94238363 CN94238363 CN 94238363 CN 94238363 U CN94238363 U CN 94238363U CN 2203804 Y CN2203804 Y CN 2203804Y
- Authority
- CN
- China
- Prior art keywords
- handset
- machine tool
- voltage
- auxiliary machines
- utility
- 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.)
- Expired - Fee Related
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Abstract
The utility model relates to a safe power supply for experiments. The utility model is characterized in that a machine body is divided into a main machine (manipulated by a teacher) and auxiliary machines (manipulated by students); The main machine is provided with a power supply transformer for changing commercial power into electricity with low voltage, the electricity with low voltage is conveyed to the auxiliary machines through connecting terminals and detachable conducting wires, and the electricity with low voltage is outputted by the auxiliary machines after. One main machine can drive a plurality of auxiliary machines. Thus, the utility model can prevent students directly contacting electric appliances for increasing safety, and the electric appliance are introduced with commercial power. The main machine is provided with a switch with separate gears for controlling the gear valve of the output voltage of the auxiliary machines. The utility model can avoid the condition that experimental devices are damaged because students regulate voltage into a high valve at will. The main machine and the auxiliary machines all have over-current protection.
Description
The utility model relates to a kind of supply unit, particularly a kind of safety power supply device.
At present, the power supply that the laboratory is used becomes the 220V civil power into low pressure all over adopting complete machine, a complete machine to include power transformer, and output wiring terminal is set on the body; Like this, experimenter (student) health directly touches the electrical equipment of introducing the 220V civil power, as if power line breakage, machine electric leakage security incident takes place easily; In addition, body is provided with the branch position switch, this switch of experimenter's direct control, and the output voltage adjusting range is very wide, very easily damages experiment apparatus.
Task of the present utility model is to provide a kind of degree of safety high experimental power supply for overcoming above-mentioned prior art deficiency.
The utility model is to take following technical scheme to realize: with the experimental power supply separated into two parts, referring to accompanying drawing 1.First is a machine tool 1, be teacher's distributor box, machine tool 1 is provided with power transformer civil power is become low pressure, and power transformer adopts two circle formula windings of primary and secondary high degree of isolation, the secondary low-voltage winding is established some taps, is connected to X on the casing binding post by a minute position switch
1, X
2On, the secondary winding of establishing in addition also is connected to another binding post X after rectification
3On; Second portion is that handset 2 is student's electricity consumption box, corresponding binding post X on setting and machine tool 1 casing on the box body
1 1, X
1 2, X
1 3, X
1 1, X
1 2Be the AC input terminal of handset 2, X
1 3Be direct-flow input end of handset 2, X
1 1, X
1 2, X
1 3The dismountable lead of corresponding connection is to X
1, X
2, X
3, when debugging and use, connect lead; When depositing and transporting, lead is taken apart, machine tool 1 and handset 2 can separately be deposited easily.Handset 2 also is provided with a cover rectification circuit will be from X
1 1, X
1 2Voltage commutation that terminal is obtained or direct current are connected to X then
6, X
7Export on the terminal.Machine tool 1 also is provided with a rectification circuit through terminal X
3To handset 2 terminal X
1 3Carry a DC control voltage; establish a circuit overcurrent protection in the handset 2; its power supply is taken from this voltage; also establish a circuit overcurrent protection in the machine tool; when machine tool 1 and handset 2 occur output current respectively when excessive; all can cut off this control voltage automatically, make handset not have AC and DC output, thereby mother, handset all are protected.Machine tool of this programme can be with some estrade machines.In addition, handset dc output end X
6, X
7A D.C. voltmeter in parallel is established the voltage stabilizing circuit of a direct current adjustable voltage in the handset, carry the branch retaining voltage of coming from machine tool for student's fine tuning.
Technique effect of the present utility model is that (1) student no longer contacts the gas-distributing motor box of introducing 220V voltage, thereby has improved degree of safety greatly.(2) teacher can require the corresponding voltage of master control to flow to the student according to the required difference of various experiments, and the student adjusts handset output ceiling voltage and is limited by the voltage that the teacher presented at that time, thereby prevents to damage experiment apparatus because of overtension.(3) machine tool, handset are provided with overcurrent protection respectively; during the general output short-circuit of handset; can not cause machine tool to shut down and disturb other handset, and work as handset short circuit current excessive (for example certain student changes copper cash with the handset fuse), main frame then can be shut down and be obtained reliably protecting.(4) on each student's electricity consumption box a voltmeter is set all, student's scalable knob obtains voltage accurately, and direct current output does not have the handset line drop of far-end.
Below in conjunction with drawings and Examples the technical solution of the utility model is described further.
Accompanying drawing 1 is the utility model block diagram, square frame 1 expression machine tool 1, and machine tool 1 has the terminal X of detachable lead
1, X
2, X
3, machine tool 1 input 220V voltage.Square frame 2 expression handsets 2, handset 2 corresponding machine tools 1 have the terminal X of detachable lead
1 1, X
1 2, X
1 3, handset 2 also has the sub-X of ac voltage output
4, X
5, the sub-X of dc voltage output end
6, X
7Machine tool 1 can be with some handsets 2.Machine tool 1 and handset 2 are at X
1, X
2, X
3Terminal and X
1 1, X
1 2, X
1 3Can correspondingly connect lead between the terminal.
Accompanying drawing 2 is the utility model machine tool 1 electrical schematic diagram, step-down transformer B input 220V civil power, power turn-on K switch
A, turn KC two position switch and KB4 position switch, control relay coil K respectively
1, K
2, K
3, K
4, K
5Make its conducting, the voltage of the different numerical value of 8 grades of controlled output can be distinguished in its contact, connects current transformer LH again
2To X
1Terminal, another termination of transformer secondary output X
2Terminal.Another low pressure winding of transformer meets rectification circuit D
1-4, negative pole connecting terminal X after the rectification
2, positive pole is then by relay contact J
2, J
1Link terminal X
3, X
3Terminal is carried direct-current control voltage to handset.Triode BG
1, resistance R
16, capacitor C
16, time-base integrated circuit IC
2(NE555), relay J
2, current transformer LH
2The circuit overcurrent protection of forming machine tool 1, current transformer LH
2Secondary output end g
1, g
2During overtension (during transformer B low pressure winding output overcurrent), D
12-15Rectification is after R
13To BG
1Base stage, BG
1Electric current rises, R
15Voltage drop increases, IC
2The 6th pin voltage descends, and when dropping to 1/3 supply voltage, output stage 3 pin voltages rise, J
2Coil current is die-offed, contact J
2Open, make X
3There is not the output of control voltage.R
11, R
12, C
11, C
12, IC
1(NE555) and relay J
1Form the t time delay circuit, when machine tool 1 is opened K switch
AThe time, J
1The contact delays a period of time closure, and impulse current reduces when making machine tool 1 start.
Accompanying drawing 3 is the utility model handset 2 electrical schematic diagrams, X
1 1, X
1 2Be input terminal, connect dismountable lead, can accept machine tool 1X
1, X
2Terminal voltage, X
4, X
5Be ac output end.X
1 3Available dismountable lead and machine tool X
3Terminal connects, D
27, C
24, BG
2, R
28, R
29, C
25, IC
3(NE555), J
3Form circuit overcurrent protection, R
25Be dropping resistor, R
25Numerical value is very little, and for example X is worked as in 0.1 Europe
5When the terminal output current is excessive, R
25Last pressure drop increases, through above-mentioned protective circuit, and J
3The contact separately cuts off output, realizes the handset overcurrent protection.Because the machine tool electric current is specified summation of counting the handset electric current with platform, so every estrade machine rated current is significantly smaller than machine tool, the timely disjunction of mother and sons' machine overcurrent can not have influence on machine tool and cut off the output of control voltage, thereby other handsets all can keep operate as normal.In addition, from the X of handset 2
4, X
5Terminal incoming transport electric current is through D
21-24, BG
3, integrated circuit (IC)
4(LM317), potentiometer W, D
25, R
23, C
22Form voltage stabilizing circuit, adjust potentiometer W, can make the LM317 regulator block through BG
3Output voltage values meets required precision after the dilatation, and the direct current after the voltage stabilizing is by terminal X
6, X
7Output X
6, X
7End span meets voltmeter V.
Claims (7)
1, laboratory safety power supply comprises step-down transformer and output wiring terminal, it is characterized in that this power supply is made up of machine tool (1) and handset (2) two parts, and machine tool (1) is provided with step-down transformer B, binding post X
1, X
2, X
3, handset (2) is provided with corresponding binding post X
1 1, X
1 2, X
1 3
2,, it is characterized in that machine tool (1) establishes rectification circuit D according to the described safety power supply of claim 1
1-4Cathode output end connects binding post X
3
3,, it is characterized in that machine tool (1) is provided with branch position switch KB according to claim 1,2 described safety power supplies.
4,, it is characterized in that handset (2) is provided with voltage and adjusts potentiometer W according to claim 1,2 described safety power supplies.
5,, it is characterized in that machine tool (1) is provided with current transformer CH according to claim 1,2 described safety power supplies
2
6,, it is characterized in that handset (2) is provided with sample resistance R according to claim 1,2 described safety power supplies
25
7,, it is characterized in that handset (2) is provided with voltmeter V according to claim 1,2 described safety power supplies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94238363 CN2203804Y (en) | 1994-10-10 | 1994-10-10 | Laboratory safety electric power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94238363 CN2203804Y (en) | 1994-10-10 | 1994-10-10 | Laboratory safety electric power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2203804Y true CN2203804Y (en) | 1995-07-19 |
Family
ID=33845804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94238363 Expired - Fee Related CN2203804Y (en) | 1994-10-10 | 1994-10-10 | Laboratory safety electric power |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2203804Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018228614A1 (en) * | 2017-06-16 | 2018-12-20 | Školab S.R.O. | Modular demonstrational panels with electrical protection powered by short circuit resistant power sources of safe low voltage |
-
1994
- 1994-10-10 CN CN 94238363 patent/CN2203804Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018228614A1 (en) * | 2017-06-16 | 2018-12-20 | Školab S.R.O. | Modular demonstrational panels with electrical protection powered by short circuit resistant power sources of safe low voltage |
| RU2739580C1 (en) * | 2017-06-16 | 2020-12-28 | Школаб С.Р.О. | Modular demonstration panels with electronic protection, operating against short-circuit-proof power sources of safe low voltage |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |