CN202482416U - Power device for automatically controlling temperature rise and heat preservation of glow ion nitrogen furnace - Google Patents
Power device for automatically controlling temperature rise and heat preservation of glow ion nitrogen furnace Download PDFInfo
- Publication number
- CN202482416U CN202482416U CN2012200148768U CN201220014876U CN202482416U CN 202482416 U CN202482416 U CN 202482416U CN 2012200148768 U CN2012200148768 U CN 2012200148768U CN 201220014876 U CN201220014876 U CN 201220014876U CN 202482416 U CN202482416 U CN 202482416U
- Authority
- CN
- China
- Prior art keywords
- circuit
- arc
- control
- voltage
- output
- 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.)
- Withdrawn - After Issue
Links
Images
Landscapes
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The utility model discloses a power device for automatically controlling temperature rise and heat preservation of a glow ion nitrogen furnace, which is used for automatically judging an arc starting state and carrying out rapid arc extinguishing and power voltage control and realizes automatic temperature rise and heat preservation process according to set requirements on the premise of ensuring that a workpiece is not damaged by fixed-point arc starting. The power device disclosed by the utility model comprises an adjustable DC power supply controlled by a phase-shifted trigger control, a control circuit and an energy storage capacitor, wherein the control circuit is connected with the phase-shifted trigger circuit and comprises an arc detection circuit, a temperature-controlled PID (Proportion Integration Differentiation) adjuster, a processor circuit, a control voltage integrated circuit and the like.
Description
Technical field
The utility model relates to a kind of thermochemical treatment equipment, relates in particular to a kind of supply unit that glow ion nitrogen furnace heats up and is incubated that is used for controlling automatically.
Background technology
Since the seventies; China has developed first glow ion nitrogen furnace and has made that this novel process of nitrogenize is able to use and promote; This device power supply (DPS) partly adopts resistor to limit the rising of electric current; To ensure the unlikely damage of electric elements, circuit working state is stable, and avoids workpiece to burn because of overcurrent.This direct supply is by forming with the lower section:
Adjustable direct supply; Energy storage capacitor; Triggering circuit; Wash phase is beaten arc resistance.This power supply drives and protect still perfect inadequately on pilot circuit, has influenced the safety of equipment, haves much room for improvement, and shortcoming is: detect control arc discharge complicated circuit, judgement speed is unhappy, influences the safety of power supply; Wash phase need insert resistance and cause energy dissipation, complex operation; Because glow discharge nitriding is at temperature rise period and holding stage, the sparking voltage of processing requirement often is lower than aura and lights required voltage, has increased by one group of ignition circuit for this reason; Can not solve the automatic realization of ion nitriding technology, keep away unavoidable a lot of artificial factors all the time, such as the TRT long, the workpiece fixed point is beaten arc, defective work piece.These factors are restricting the application of ion nitriding furnace always.
Open day be that on 09 13rd, 2000, publication number are that the patent documentation of CN 2396572Y discloses such technical scheme; A kind of glow ion nitrogen furnace pulse power mainly comprises adjustable direct supply, governor circuit and pilot circuit, connects governor circuit behind the adjustable direct supply; Governor circuit comprises the reservoir capacitance C parallelly connected with adjustable direct supply; The holding circuit that is connected on the power switch component K in the governor circuit master loop and is made up of current-limiting inductance L and sustained diode, pilot circuit are circuit that the working order of power switch component K in the governor circuit is controlled etc., judge signal and time-delay from the arc of beating that main control loop is got the master loop; The output of control square wave; Square wave exports the control end of driving circuit to, and the output of driving circuit connects the control utmost point of power switch component, adopts to detect and beats arc current and two signals of voltage; Reliable turn-off power switch component in the shortest time, the safety of protection power device.The weak point of this scheme is to judge the character of beating arc, and when heating up to the automatic adjustment of electric current and voltage, insulation control etc. automatically, thereby power source design is perfect inadequately.
Summary of the invention
The utility model main purpose is to provide a kind of automatic control glow ion nitrogen furnace to heat up and the supply unit of insulation; The arcuation attitude is beaten in its automatic judgement; And carry out the control of quick arc extinguishing, voltage of supply; Guaranteeing that workpiece is not fixed a point not beat under the prerequisite of arc damage, realize by automatic intensification and the insulating process of setting requirement.
The utility model mainly is able to solve through following technical proposals to the prior art problem; The supply unit that a kind of automatic control glow ion nitrogen furnace heats up and is incubated; Comprise the adjustable direct supply that uses phase-shift trigger circuit control, pilot circuit, energy storage capacitor; Pilot circuit connects phase-shift trigger circuit, and pilot circuit comprises:
The arc testing circuit, it detects through electric current and the voltage of gathering adjustable direct supply output loop whether arc takes place to beat, and the arc signal is beaten in output when playing the arc generation;
Temperature control PID setter, temperature control PID setter detect the interior temperature of stove and export the output that the PID regulation voltage signal removes to control adjustable direct supply according to design temperature;
Processor circuit, processor circuit judges whether to beat arc into fixed point according to the arc signal of beating of arc testing circuit output; The output processor regulating voltage goes to control the output of adjustable direct supply; Carry out soaking time control according to setting soaking time; In time phase-shift trigger circuit is triggered behind the arc extinguishing, carry out starting voltage control according to vacuum detecting in build-up of luminance setting, the stove;
Control voltage synthetic circuit, control voltage synthetic circuit output to phase-shift trigger circuit after the current feedback of PID regulation voltage signal, treater regulating voltage and adjustable direct supply is synthesized.
Here, whether arc testing circuit relation of voltage and electric current when beating arc detects and takes place to beat arc, and process is rapid, will beat arc detected result sending processor circuit and carry out arc extinguishing and handle.Treater reduces adjustable direct supply voltage arc extinguishing when beating arc in the shortest time; Provide keep-alive voltage behind the arc extinguishing rapidly; Thereby suppress overcurrent, superpotential appearance, when guaranteeing that workpiece is not beaten arc damage, power device safety by fixed point, realize the automatic control that heats up.Temperature control PID unit heats up by setting furnace temperature, is incubated by soaking time behind the arrival design temperature, and soaking time is cut off adjustable direct supply to the back, stops glow ion nitrogen furnace being supplied power.
Processor circuit air exercise arc character is judged; If fixed point beat arc then processor circuit in time reduce adjustable direct supply outward current (electric current in the body of heater) till the arc light disappearance; And the electric current will fix a point to beat arc the time as a reference, avoids occurring more than or equal to the electric current of this reference current; If for non-fixed point is beaten arc then suitably reduced the adjustable direct supply output voltage and the rate of rise, keep safety to heat up.
Control voltage synthetic circuit outputs to the output that phase-shift trigger circuit is adjusted adjustable direct supply after the current feedback of PID regulation voltage signal, treater regulating voltage and adjustable direct supply is synthesized.
As preferably, an input terminus of arc testing circuit connects voltage sampling circuit, and an input terminus connects current sampling circuit, the output terminal connection processing device circuit and the phase-shift trigger circuit of arc testing circuit; Temperature control PID setter connects furnace temperature testing circuit, temperature setting device, processor circuit and control voltage synthetic circuit one input terminus; A control voltage synthetic circuit also input terminus connects current sampling circuit; An input terminus connection processing device circuit also; Processor circuit also connects vacuum detecting circuit, build-up of luminance setting device, insulation setting device, current sampling circuit, temperature setting device.The arc of beating of arc testing circuit is exported signal except that the transmission processor circuit is played the judgement of arc character, arc extinguishing processing, also is delivered directly to phase-shift trigger circuit and closes adjustable direct supply output, further increases arc extinguishing and controls.Temperature control PID setter carries out furnace temperature according to detection furnace temperature, design temperature and regulates control, notification processor circuit after reaching design temperature, and processor circuit picks up counting, and after reaching the soaking time that sets, cuts off the output of adjustable direct supply.Processor circuit detects vacuum tightness in the stove, receives the starting voltage setting; Receive insulation setting, the electric current when the collection fixed point is beaten arc etc.
As preferably, the arc testing circuit increases to detect and beats arc and take place according to the voltage electric current that descends simultaneously, and through impulse hits influence in the pulse absorption circuit filter out power loop.
As preferably, the arc testing circuit also comprises over-current detection circuit, and over-current detection circuit carries out the outward current overload detection of adjustable direct supply.For increasing circuit safety property, electric current is detected through the arc testing circuit, when the outward current overload of adjustable direct supply occurring, the arc testing circuit is closed phase-shift trigger circuit output, disappears until overcurrent.
As preferably, processor circuit comprises micro-chip, digital to analog converter; Analog; Operational amplifier, single-chip data input/output terminal linking number weighted-voltage D/A converter data input pin, the analog quantity output terminal of operational amplifier input terminus linking number weighted-voltage D/A converter; Operational amplifier output ramp voltage is to control voltage synthetic circuit, and the data output end of analog connects the single-chip data input/output terminal.Adopt ramp voltage output control, saltus step occurs and influence the stable output of adjustable direct supply to avoid adjusting voltage, analog is used to gather the current values of adjustable dc power supply circuit.
As preferably, micro-chip takes a decision as to whether and fixes a point to beat arc through measuring the lasting duration of beating arc.Confirm the lasting duration of beating arc according to material elementses such as body of heater, workpiece, the arc duration of beating that surpasses regulation then thinks to fix a point to beat arc.
As preferably, micro-chip also connects warning circuit.Occurring fixing a point to beat arc, when being incubated states such as beginning, be incubated end, sending sound, light warning, prompting managerial personnel note.
As preferably, micro-chip connects a serial ports indicating meter, is used for various parameters and shows.
The beneficial effect that the utility model brings is, detects and processor circuit control through the arc testing circuit, if beat arc for non-fixed point then suitably reducing the adjustable direct supply output voltage and the rate of rise behind the arc extinguishing rapidly, keep the safety intensification; If be when beating arc then the rapid arc extinguishing of fixed point, and the electric current as a reference of the electric current will fix a point to beat arc the time, electric current appearance controlled more than or equal to this reference current; Arc extinguishing preprocessor circuit provide rapidly keep-alive voltage and progressively safety boost, thereby suppress overcurrent, superpotential occurs, guarantee that workpiece is not beaten by fixed point that arc damages, in the power device safety, realizing heats up automatically controls and preservation and controlling.
Description of drawings
Fig. 1 is a kind of schematic block diagram of the utility model;
Fig. 2 is a kind of processor circuit of the utility model;
Fig. 3 is a kind of arc testing circuit of the utility model;
Fig. 4 is a kind of control voltage synthetic circuit of the utility model;
Fig. 5 is a phase-shift trigger circuit;
Fig. 6 is the technology basic procedure;
Fig. 7 is a kind of groundwork schema of the utility model.
Wherein: the 1st, adjustable direct supply, 1-1 are phase-shift trigger circuits, the 2nd, processor circuit, the 3rd, control voltage synthetic circuit, the 4th, arc testing circuit; The 5th, build-up of luminance setting device, the 6th, temperature setting device, the 7th, temperature control PID setter, the 8th, vacuum detecting circuit, the 9th, temperature setting device; The 10th, furnace temperature testing circuit, the 11st, voltage detecting circuit, the 12nd, current sampling circuit, the 13rd, glow ion nitrogen furnace; The 14th, warning circuit, the 15th, relay1 switch, the 16th, vacuum extractor, C are energy storage capacitors.
Embodiment
Below through embodiment, and combine accompanying drawing, the technical scheme of the utility model is further specified.
Embodiment: as shown in Figure 1; The utility model is the supply unit that a kind of automatic control glow ion nitrogen furnace heats up and is incubated; The phase-shift trigger circuit 1-1 of adjustable direct supply 1 connects pilot circuit, and adjustable direct supply 1 output terminal connects energy storage capacitor C and glow ion nitrogen furnace 13.Wherein, pilot circuit comprises:
Arc testing circuit 4 connection voltage sampling circuits 11 and current sampling circuit 12 are beaten arc detection and current overload and are detected, and output is beaten the arc signal and played the arc processing to processor circuit 2, and output is simultaneously beaten the arc signal and directly closed the phase shift triggering to phase-shift trigger circuit;
Temperature control PID setter 7 connects furnace temperature testing circuit 10 and temperature setting device 9; The regulation voltage signal of output is to control voltage synthetic circuit 3; Sending to warm signal when temperature reaches design temperature in recording stove is incubated timing for processor circuit 2; And keep current furnace temperature, reach set soaking time after, processor circuit 2 is closed adjustable direct supply 1;
The voltage adjustment signal of input terminus difference connection processing device circuit 2 outputs of control voltage synthetic circuit 3, the regulation voltage signal and the current sampling circuit 12 of temperature PID setter 7, output terminal connects phase-shift trigger circuit 1-1.
Build-up of luminance setting device 5 is used to set starting voltage, and insulation setting device 6 is used to be incubated duration to be set, and furnace temperature setting device 9 is used for furnace temperature and sets.Build-up of luminance setting device 5, insulation setting device 6 are the simplified processor circuit; Use the 4X4 determinant keyboard to replace accomplishing the related data input; Furnace temperature setting device 9 adopts and temperature control PID setter 7 matching used thermometers; Warning circuit 14 adopts light and speaker to accomplish acousto-optic hint, the output terminal of the control end connection processing device circuit 2 of relay1 switch 15, the break-make of the contact control AC power of relay1 switch 15.
Fig. 2 is said to be processor circuit, and micro-chip adopts TA89C51, and digital to analog converter is DAC0832, and analog adopts ADC0809, and operational amplifier adopts LM358.The P2 mouth of TA89C51 connects the 4X4 determinant keyboard; As the setup parameter input unit, the P0 mouth connects DAC0832 and ADC0809 as data input, delivery port, and P1.0 is as the DAC0832 chip select line; P1.1 is as the ADC0809 chip select line; P1.5 to P1.7 is an ADC0809 channel selecting line, and temperature control PID setter 7 is issued to warm signal when setting controlled temperature and carries out the timing register IC to the P3.4 port reaching, and timing time is to being incubated P1.4 switching off AC power behind the duration; Beat the arc signal and be input to the P1.2 port, receive to pick up counting after beating the arc signal, beat the arc blackout and stop timing, then think to fix a point to beat arc when the timing duration reaches the regulation duration; Guard signal, relay1 switch wave are respectively by P1.3 and P1.4 output; P3.5 is set to the I/O functional status, and the control vacuum extractor starts, shuts down.Under the control of TA89C51, obtain ramp voltage on the resistance R 3 and output to control voltage synthetic circuit 3.Vacuum sampled signal, current sampling signal, furnace temperature detection signal be the input terminus of connection mode number converter ADC0809 respectively; The serial ports of TA89C51 (P3.0, P3.1) connects serial ports indicating meter (model is EBD035Z10) and carries out input parameter, state parameter demonstration.
Shown in Figure 3 is the arc testing circuit, and the voltage signal of voltage sampling circuit 11 at first through capacitor filtering filtering impulse hits, is delivered to NAND gate circuit again after processing such as threshold value setting circuit; The current signal of current sampling circuit 12 at first through capacitor filtering filtering impulse hits, is delivered to NAND gate circuit again after processing such as threshold value setting circuit; Descend and the phenomenon of electric current rising simultaneously when occurring at voltage, the arc signal of beating of NAND gate circuit output outputs to micro-chip TA80C51 with the square wave mode and carries out the arc extinguishing processing after monostable circuit 74LS123 handles.
In the arc testing circuit, also being provided with overcurrent detects; When overcurrent occurring in the adjustable dc power supply circuit; The current signal that comes from current sampling circuit 12 is at first through the threshold value setting circuit; To monostable circuit 74LS123 outward current overload signal, micro-chip TA89C51 output voltage conditioning signal reduces adjustable direct supply output voltage when surpassing the setting threshold values.
Fig. 4 is a control voltage synthetic circuit, after the synthetic amplification of the treater regulating voltage of processor circuit and PID regulating voltage, together delivers to phase-shift trigger circuit as the phase shift triggering signal with current feedback signal again.
Fig. 5 is said to be phase-shift trigger circuit, adopts advanced high-performance thyristor three-phase phase-shift trigger ic TC787.The phase shift triggering signal of control voltage synthetic circuit 3 sends to the phase shift controlling voltage input terminus of TC787, carries out adjustable direct supply output voltage control; Beat arc signal and the over-current signal of arc testing circuit 4 send to the output pulse inhibit end of TC787 as arc extinguishing/overcurrent protection signal, forbid the output of TC787, and TC787 recovers output immediately behind arc extinguishing/overcurrent protection blackout.
Fig. 6 is a typical process flow, accomplishes workpiece cleaning in the technological preparation stage, vacuumizes, ammonia minimum gas importing etc.; Voltage, current step increase the entering temperature rise period, control voltage rising speed in the temperature rise period according to beating the arc situation; When temperature reaches design temperature in the stove, get into holding stage, carry out preservation and controlling by temperature control PID setter; Soaking time reaches the set(ting)value entering temperature-fall period of cutting off the electricity supply.
Fig. 7 is the groundwork schema, comprises step:
Step 106 detects the electric current when beating arc, and with the electric current storage as a reference of this electric current, as a reference, controls the amplitude of boosting when boosting;
So the utlity model has: detect and processor circuit control through the arc testing circuit, beat arc then suitably reducing the adjustable direct supply output voltage and the rate of rise behind the arc extinguishing rapidly, keep safety to heat up for non-fixed point; Processor circuit is judged as fixed point arc extinguishing rapidly then when beating arc, and the electric current as a reference of the electric current will fix a point to beat arc the time, controls the electric current appearance more than or equal to this reference current; Arc extinguishing preprocessor circuit provide rapidly keep-alive voltage and progressively safety boost, thereby suppress overcurrent, superpotential occurs, guarantee that workpiece is not beaten by fixed point that arc damages, in the power device safety, realizing heats up automatically controls and characteristics such as preservation and controlling.
Claims (8)
1. control the supply unit that glow ion nitrogen furnace heats up and is incubated automatically for one kind; Comprise the adjustable direct supply that uses phase-shift trigger circuit control; Pilot circuit, energy storage capacitor, said pilot circuit connects the output that phase-shift trigger circuit is controlled adjustable direct supply; It is characterized in that said pilot circuit comprises:
The arc testing circuit, said arc testing circuit detects through electric current and the voltage of gathering adjustable direct supply output loop whether arc takes place to beat, and the arc signal is beaten in output when playing the arc generation;
Temperature control PID setter, said temperature control PID setter detect the interior temperature of stove and export the output that the PID regulation voltage signal removes to control adjustable direct supply according to design temperature;
Processor circuit, said processor circuit judges whether to beat arc into fixed point according to the arc signal of beating of arc testing circuit output; The output processor regulating voltage goes to control the output of adjustable direct supply; Carry out soaking time control according to setting soaking time; In time phase-shift trigger circuit is triggered behind the arc extinguishing, carry out starting voltage control according to vacuum detecting in build-up of luminance setting, the stove;
Control voltage synthetic circuit, said control voltage synthetic circuit output to said phase-shift trigger circuit after the current feedback of PID regulation voltage signal, treater regulating voltage and adjustable direct supply is synthesized.
2. the supply unit that heats up and be incubated according to the said a kind of automatic control glow ion nitrogen furnace of claim 1; It is characterized in that: an input terminus of said arc testing circuit connects voltage sampling circuit; One input terminus connects current sampling circuit, the output terminal connection processing device circuit and the phase-shift trigger circuit of said arc testing circuit; Said temperature control PID setter connects furnace temperature testing circuit, temperature setting device, processor circuit and control voltage synthetic circuit one input terminus; A said control voltage synthetic circuit also input terminus connects current sampling circuit; An input terminus connection processing device circuit also; Said processor circuit also connects vacuum detecting circuit, build-up of luminance setting device, insulation setting device, current sampling circuit, temperature setting device.
3. the supply unit that heats up and be incubated according to the said a kind of automatic control glow ion nitrogen furnace of claim 1; It is characterized in that: said arc testing circuit increases to detect according to voltage decline while electric current plays the arc generation, and influences through impulse hits in the pulse absorption circuit filter out power loop.
4. according to claim 1 or 2 or 3 said a kind of automatic control glow ion nitrogen furnaces heat up and the supply unit of insulation; It is characterized in that: said arc testing circuit also comprises over-current detection circuit, and said over-current detection circuit carries out the outward current overload detection of adjustable direct supply.
5. the supply unit that heats up and be incubated according to the said a kind of automatic control glow ion nitrogen furnace of claim 1; It is characterized in that: said processor circuit comprises micro-chip; Digital to analog converter, analog, operational amplifier; Said single-chip data input/output terminal linking number weighted-voltage D/A converter data input pin; The analog quantity output terminal of operational amplifier input terminus linking number weighted-voltage D/A converter, said operational amplifier output processor regulating voltage is to control voltage synthetic circuit, and the data output end of said analog connects the single-chip data input/output terminal.
6. heat up according to the said a kind of automatic control glow ion nitrogen furnace of claim 5 and the supply unit of insulation, it is characterized in that: said micro-chip takes a decision as to whether and fixes a point to beat arc through measuring the lasting duration of beating arc.
7. the supply unit that heats up and be incubated according to the said a kind of automatic control glow ion nitrogen furnace of claim 5, it is characterized in that: said micro-chip also connects warning circuit.
8. according to the supply unit of claim 5 or 6 or 7 said a kind of automatic control glow ion nitrogen furnaces intensifications and insulation, it is characterized in that: said micro-chip connects a serial ports indicating meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200148768U CN202482416U (en) | 2012-01-13 | 2012-01-13 | Power device for automatically controlling temperature rise and heat preservation of glow ion nitrogen furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200148768U CN202482416U (en) | 2012-01-13 | 2012-01-13 | Power device for automatically controlling temperature rise and heat preservation of glow ion nitrogen furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202482416U true CN202482416U (en) | 2012-10-10 |
Family
ID=46956853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200148768U Withdrawn - After Issue CN202482416U (en) | 2012-01-13 | 2012-01-13 | Power device for automatically controlling temperature rise and heat preservation of glow ion nitrogen furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202482416U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102676984A (en) * | 2012-01-13 | 2012-09-19 | 杭州市机械科学研究院有限公司 | Power supply device for automatically controlling temperature rise and heat preservation of glow plasma nitriding furnace |
| CN105486100A (en) * | 2015-12-07 | 2016-04-13 | 中国电子科技集团公司第四十八研究所 | Automatic temperature rising system for continuous kiln |
-
2012
- 2012-01-13 CN CN2012200148768U patent/CN202482416U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102676984A (en) * | 2012-01-13 | 2012-09-19 | 杭州市机械科学研究院有限公司 | Power supply device for automatically controlling temperature rise and heat preservation of glow plasma nitriding furnace |
| CN102676984B (en) * | 2012-01-13 | 2014-01-01 | 杭州市机械科学研究院有限公司 | Power supply device for automatically controlling temperature rise and heat preservation of glow plasma nitriding furnace |
| CN105486100A (en) * | 2015-12-07 | 2016-04-13 | 中国电子科技集团公司第四十八研究所 | Automatic temperature rising system for continuous kiln |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107440157B (en) | Dry burning prevention device of electronic cigarette and dry burning prevention control method thereof | |
| CN201081275Y (en) | Gas stove ignition system and the gas stove | |
| CN101663814A (en) | Power cutoff device automatically operated upon occurrence of spark on electric wire | |
| CN102781130B (en) | Large-power electromagnetic cooker circuit based on power electronic technology | |
| CN202482416U (en) | Power device for automatically controlling temperature rise and heat preservation of glow ion nitrogen furnace | |
| CN201008141Y (en) | Two wire terminal intelligent power supply switch | |
| CN102676984B (en) | Power supply device for automatically controlling temperature rise and heat preservation of glow plasma nitriding furnace | |
| RU2010134369A (en) | TWO ENTRANCE POLE IGNITION DEVICE | |
| CN204165240U (en) | Air-heater heating resistance wire delay closing circuit system | |
| CN204095721U (en) | A kind of new automobile auxiliary power unit (APU) | |
| CN104503520B (en) | A kind of power distribution cabinet internal heater ON-OFF control circuit | |
| CN1208577C (en) | Rapid safety protector of gas device | |
| CN206386974U (en) | A kind of flame auto-control energy saver of gas cooker | |
| CN201374463Y (en) | Energy-saving socket | |
| CN201033383Y (en) | Energy-saving electric iron | |
| CN201349205Y (en) | Sound control switch | |
| CN210511788U (en) | Thermocouple electromagnetic valve instant suction type single needle sensing gas cooker pulse ignition controller | |
| CN203564126U (en) | Oven safety control protecting system and oven provided with same | |
| CN202183531U (en) | Energy-saving socket for electromagnetic ovens and microwave ovens | |
| CN201557309U (en) | Indicator light driving circuit of low-tension small-power incandescent bulb | |
| CN2615532Y (en) | Fast safety protector for gas utensil | |
| CN206696737U (en) | A kind of switching system | |
| CN204494602U (en) | Electric heater control device | |
| CN201690205U (en) | Zero-crossing detection circuit | |
| CN2893892Y (en) | Starting protective switch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20121010 Effective date of abandoning: 20140101 |
|
| RGAV | Abandon patent right to avoid regrant |