CN208864082U - Commercial gas premixes ratio control energy-saving steam cabinet entirely - Google Patents

Abstract

The utility model discloses a kind of commercial gas to premix ratio control energy-saving steam cabinet entirely; including steam box, burner and water tank, ignition electrode; it further include the first electromagnetic switch valve, the second electromagnetic switch valve, GAS/AIR Proportional valve, frequency controlling fan and mixed gas outlet; frequency controlling fan circuit connection has MCU; first electromagnetic switch valve and the second electromagnetic switch valve control driving circuit by electromagnetic switch valve and connect with MCU, and MCU passes sequentially through ionic flame detection blowout protection circuit and isolating high-pressure ignitor is connect with ignition electrode.The utility model controls the size of air by intelligent ratio to control the premix amount of combustion gas and control combustion power, and the full premix combustion thermal efficiency reaches 90% or more, reduces unnecessary burning, and energy-saving effect is good.

Description

Commercial gas premixes ratio control energy-saving steam cabinet entirely

Technical field

The utility model relates to energy-saving steam cabinet fields more particularly to a kind of commercial gas to premix ratio control energy-conserving steaming entirely Cabinet, with full premix combustion high thermal efficiency, intelligent power saving management control, combustion power is adjustable setting and safety failure self-test simultaneously Report the function of failure.

Background technique

Commercial gas steamer is ordinary strong exhaust band blowout protection Combustion System currently on the market, and the thermal efficiency generally only has 50% or so, when burning, is the largest always combustion power burning, when steam heat reaches balance, will generate remaining combustion It burns, the combustion thermal efficiency of another forced-ventilated burning is not high, wastes a large amount of fuel, high so as to cause use cost.Additionally It has the following problems:

First, the blowout protection of the preceding kitchen range of commercial gas on the market ignition controller and commercial gas steamer ignition controller Technology is all the technically simple application of household gas apparatus ion detection, is not suitable for commercial use environment.

The high-tension ignition energy ratio household of commercial gas kitchen tools ignition controller it is two 3 times big, damage to controller and Interfere probability much larger；Commercial gas kitchen tools use environment is moist, and ionic current, which easily leaks, causes fire defector sensitivity low, accidentally Report flare up fire；Fire defector needle and high-tension ignition needle are all separate from, and while installing will have biggish separation distance, no High pressure of then lighting a fire climbs electricity and causes ignition control circuit to damage or be disturbed to fire defector needle, causes combustion gas largely to leak and pacifies Full accident problem；Or fire defector needle and high-tension ignition are directed to point and form fire defector circuit, are not big with burner housing Ground forms detection and returns, and igniting high pressure is not released well when igniting, so that high pressure is transmitted to kitchen by frying pan along combustion flame Shi Zaocheng has the feeling of numb electricity.

The flame detection circuit of existing market commercial gas ignition controller is all to transplant domestic gas appliance flame detection circuit It uses, causes control circuit control unstable or damage, influence the normal use of commercial kitchen tools, until being reluctant existing commercial kitchen tools all Meaning uses ion blowout protection, brings very serious safe handling problem to commercial kitchen tools in this way, and each place combustion gas association forces Country can not be executed to hotel industry gas-fired kitchen safety management.

Second, commercial steamer is all using low-voltage dc voltage to water level detecting on the market, this detection mode can be because of direct current Voltage, which is added on water level detecting needle, generates ionization chemical action, and water level detecting needle is made quickly to adhere to scale.Due to the resistance of scale Greatly, when the amount of scale of water level detecting wire surface attachment is excessive, conductive current will be very low, and detection circuit is caused to can't detect electricity Pulse can not be detected having water.Scale can also promote electrochemical corrosion to aggravate, and water level detecting wire surface is caused to corrode, The damage of heating surface is accelerated to shorten its service life to reduce the detection accuracy of water level detecting needle.Further, since water body In high-boiling evaporation, fluctuation is very big up and down for the water surface, easily leads to the erroneous detection of water level, ultimately causes dry combustion method and damage water tank.

Third, at present commercial gas kitchen range ignition controller and commercial gas steamer ignition controller on the market, combustion gas Electromagnetic switch valve-driving circuit is all to directly adopt low and high level driving method, and this driving method is dead by external interference in MCU Combustion gas electromagnetic switch valve, the safety problem for causing combustion gas to leak for a long time can be opened after machine for a long time.In addition, combustion gas electromagnetic switch valve exists Afc voltage 24V or more works long hours, combustion gas electromagnetic switch valve can because of the excessively high damage of temperature, cause the maintenance cost of equipment compared with Height, use cost increase.

In high temperature, wet environment when now the ignition controller of commercial combustion gas kitchen tools in the market is because using, due to igniting Energy is big and interferes the reasons such as big, leads to not to be arranged safety protection mechanism, in the presence of very big security risk when use.

Utility model content

The purpose of the utility model is to provide a kind of commercial gas to premix ratio control energy-saving steam cabinet entirely, passes through intelligent ratio The size of air is controlled to control the premix amount of combustion gas and control combustion power, the full premix combustion thermal efficiency reaches 90% or more, subtracts Few unnecessary burning, energy-saving effect are good.

To achieve the above object, the utility model provides a kind of commercial gas and premixes ratio control energy-saving steam cabinet entirely, including Steam box and water tank equipped with burner are equipped with an ignition electrode in burner, further include first set gradually along combustion gas flow direction Electromagnetic switch valve, the second electromagnetic switch valve, GAS/AIR Proportional valve, frequency controlling fan and the gaseous mixture in burner Outlet, frequency controlling fan circuit connection have MCU, and the first electromagnetic switch valve and the second electromagnetic switch valve pass through electromagnetic switch valve control Driving circuit processed is connect with MCU, which passes sequentially through ionic flame detection blowout protection circuit and isolating high-pressure ignitor and the point Fiery needle connection.

Electromagnetic switch valve control driving circuit includes structure identical the as a further improvement of the utility model, One drive circuit and the second driving circuit, the first driving circuit include capacitor C1, and the anode of capacitor C1 is connect with the MCU, and two Being grounded by resistance R5 between person；The cathode of capacitor C1 is connect by resistance R4 with the base stage of amplifier Q3, is led between the two Cross diode D2 ground connection；The emitter of amplifier Q3 is grounded；The collector of amplifier Q3 by resistance R3 and resistance R2 respectively with The base stage of triode Q1 is connected with emitter, and the emitter of triode Q1 passes sequentially through resistance R1, diode D1 and described first Electromagnetic switch valve connection, the plus earth of diode D1；The collector of triode Q1 and the first electromagnetic switch valve and diode D1 Cathode connection, the collector of triode Q1 connect by resistance R6 with MCU；It further include diode Z1 and capacitor parallel with one another C2, the plus earth of diode Z1, cathode are connected between resistance R6 and MCU.

As the further improvement of the utility model, the ionic flame detection blowout protection circuit includes sending out with ion Raw circuit, flame detection circuit further include being connected to the isolating high-pressure ignitor and ion occur between circuit first to protect electricity Road, second be connected between flame detection circuit and MCU protect circuit.

As the further improvement of the utility model, comparator IC1A, flame inspection are equipped in the flame detection circuit Slowdown monitoring circuit is equipped with the flame sensing signal input terminal connecting with the isolating high-pressure ignitor, and the first protection circuit includes being connected to Optocoupler ISO1 between comparator IC1A and MCU, the second protection circuit include be connected to flame sensing signal input terminal with Ceramic discharge tube ZD1, capacitor C6 and capacitor C7 between circuit occurs for ion；Electron ion occurs to be equipped in circuit by triode The high-frequency resonant booster circuit of Q7, capacitor C9, resistance R20 and transformer T1 composition.

As the further improvement of the utility model, water level detecting needle, water tank ground connection, water level inspection are equipped in the water tank Stylus is connected with can be when water level be higher than water level detecting needle to the optocoupler ISO2 of MCU transmitting power frequency component, water level detecting needle It is connected with Industrial Frequency Transformer T2.

As the further improvement of the utility model, including after being mixed by Steam Recovery in steam box and with steam in water tank The steam circulation for refilling steam box further includes the heat-exchange system being connected between burner and steam circulation.

Beneficial effect

Compared with prior art, the commercial gas of the utility model premixes the advantages of ratio control energy-saving steam cabinet entirely are as follows:

1, this commercial gas steamer premixes ratio control energy-conserving control technology entirely, and the size of air is controlled by intelligent ratio Combustion power is controlled to control the premix amount of combustion gas, the full premix combustion thermal efficiency reaches 90% or more, steams than general commercial combustion gas Cabinet saves at least 60% fuel, and the expense saved every year is very considerable, and more safer than general commercial gas combustion steaming cabinet；

2, using steam circulation recovery technology, fuel 70% is saved to greatest extent, reaches energy-efficient purpose；

3, rotation speed of fan FL and big when rotation speed of fan FU, the output of small fire ratio when the output of kindling material ratio can be arbitrarily arranged in MCU Gas outlet amount can be arranged according to the combustion power of burner in three rotation speed of fan such as rotation speed of fan FH when fiery ratio exports, Extra combustion power caused by being unworthy of of device configuration can be reduced, power conservation requirement is reached；

4, electromagnetic switch valve control driving circuit guarantees that controller will not be because of MCU using the isolation control of 500HZ pulsed capacitance Unexpected crash causes to be opened accidentally solenoid valve and cause gas leakage；

5, ionic flame detection blowout protection circuit has many advantages, such as anti-interference strong, high sensitivity；

6, blower uses frequency controlling fan, and blower has revolving speed output, and MCU is directly closed as when judging rotation speed of fan exception System is closed, guarantees that equipment will not occur because of combustion failure caused by fan trouble or contingency；

7, it uses pulsed and exchanges water level detecting technology, low-voltage micro-current of alternation pulsing detects signal, reduction water level Needle is detected because of fouling caused by direct water solution, extends the service life of water level detecting needle；When low water level water shortage, water is boiled because of water Surface wave is dynamic to make water level detecting needle erroneous detection signal, but MCU inspection is not judged as there is water, ensure that not less than 50Hz/ second pulse signal Sentencing because of water level erroneous detection leads to dry combustion method；

8, by water level detecting needle it is alternating impulse voltage, ionization only can be just generated in pulse wave crest, and ionize Part is concentrated mainly at the needle point of water level detecting needle, and the magnesium ion that water level detecting needle is generated by electrolytics effect is greatly decreased Scale being generated with combinations such as calcium ions in water to be attached on water level detecting needle, water level detecting wire surface resistance is small, and conductive current is big, Reduce surface corrosion caused by scale simultaneously, not only improves the accuracy of detection of water level detecting needle, but also substantially extend it to make Use the service life.

Through the following description and in conjunction with the attached drawings, the utility model will become more fully apparent, these attached drawings are for explaining this The embodiment of utility model.

Detailed description of the invention

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor Under, it is also possible to obtain other drawings based on these drawings.

Fig. 1 is the schematic diagram that commercial gas premixes that ratio controls energy-saving steam cabinet entirely；

Fig. 2 is the structural schematic diagram that commercial gas premixes that ratio controls energy-saving steam cabinet entirely；

Fig. 3 is that electromagnetic switch valve controls driver circuit schematic diagram；

Fig. 4 is that ionic flame detects blowout protection circuit diagram；

Fig. 5 is water level detection circuit schematic diagram.

Specific embodiment

The embodiments of the present invention are described referring now to the drawings.

Embodiment

Specific embodiment of the present utility model is as shown in Figures 1 to 5, and a kind of commercial gas premixes ratio control energy conservation entirely Steamer, including steam box 8, the lower section of steam box 8 are equipped with water tank 7, and burner 6 is equipped in water tank 7, an igniting is equipped in burner 6 Needle 5 further includes flowing to the first electromagnetic switch valve 1, the second electromagnetic switch valve 2, GAS/AIR Proportional valve set gradually along combustion gas 3, frequency controlling fan 4 and the mixed gas outlet in burner 6,4 circuit connection of frequency controlling fan have a MCU10, and first Electromagnetic switch valve 1 and the second electromagnetic switch valve 2 control driving circuit 13 by electromagnetic switch valve and connect with MCU10, the MCU10 according to It is secondary to be connect by ionic flame detection blowout protection circuit 14 and isolating high-pressure ignitor 11 with the ignition electrode 5.MCU10 is connected with behaviour Make display.Combustion gas is controlled using double combustion gas electromagnetic switch valves, guarantees that combustion gas safe thing will not occur because of unexpected a large amount of leakages Therefore.

It further include the steam circulation system that steam box 8 is refilled after mixing by Steam Recovery in steam box 8 and with steam in water tank 7 System 9, further includes the heat-exchange system 12 being connected between burner 6 and steam circulation 9.Steam circulation 9 includes back Supervisor 92 is received, recycling supervisor 92 is equipped with circulating pump 91, and recycling 92 input terminals of supervisor are connected to the top of steam box 8.Heat exchange series System 12 includes sequentially connected smoke-intake pipe 122, heat exchanger 121 and smoke exhaust pipe 123, the input terminal and burner 6 of smoke-intake pipe 122 Connection.Recycling supervisor 92 passes through heat exchanger 121, and the output end of recycling supervisor 92 is connected by steam skirt 93 and 7 top of water tank Logical, the output end of recycling supervisor 92 also passes through new and old steam mixing tube 94 and is connected to the lower part of steam box 8.It is equipped with and is located in water tank 7 Steam water-separator 73 below 93 input terminal of steam skirt.7 side of water tank is additionally provided with the deputy tank 71 that bottom communicates therewith.

Water level detecting needle 72 is arranged in deputy tank 71, and water tank 7 is grounded, and water level detecting needle 72, which is connected with, to be higher than in water level To the optocoupler ISO2 of the MCU10 transmitting power frequency component when water level detecting needle 72, water level detecting needle 72 is connected with Industrial Frequency Transformer T2.Since 6 feed-tanks 7 of burner heat, the temperature in deputy tank 71 only has the 1/2 of water tank 7, on 72 surface of water level detecting needle The scale of attachment is few, detects more accurate.

Recycling supervisor 92 is equipped with the temperature sensor 95 connecting with MCU10.When vapor (steam) temperature reaches in recycling supervisor 92 Target temperature, MCU10 reduce firepower automatically, the enough thermal energy of steam are maintained, when such as detection vapor (steam) temperature falls back to return difference temperature (high fire start-up temperature=target temperature-return difference temperature), MCU10 open high fire immediately, and guarantee has enough quantity of steam and steam temperature Degree thus will not also burn in most high fire in vapo(u)rous and waste fuel, not only guarantee the steam for having foot temperature enough, but also energy Reach energy-efficient effect.

In the present embodiment, input voltage is specially AC180V-AC250V；The power of circulating pump is≤750W/AC220V；Point Fiery High voltage output: >=12KV, >=1.5MJ；Switch electromagnetic valve output: two-way DC24V switch electromagnetic valve.The output of switch electromagnetic valve DC220V or AC220V can also be used, the component in electromagnetic switch valve control driving circuit 13 needs to carry out certain tune It is whole.

The electromagnetic switch valve control driving circuit 13 includes identical first driving circuit of structure and the second driving circuit, First driving circuit includes capacitor C1, and the anode of capacitor C1 is connect with the MCU10, being grounded by resistance R5 between the two； The cathode of capacitor C1 is connect by resistance R4 with the base stage of amplifier Q3, is grounded between the two by diode D2；Amplifier Q3 Emitter ground connection；The collector of amplifier Q3 is connected with the base stage of triode Q1 and emitter respectively by resistance R3 and resistance R2 It connects, the emitter of triode Q1 passes sequentially through resistance R1, diode D1 and connect with first electromagnetic switch valve 1, diode D1 Plus earth；The collector of triode Q1 is connect with the cathode of the first electromagnetic switch valve 1 and diode D1, the collection of triode Q1 Electrode is connect by resistance R6 with MCU10.It further include diode Z1 and capacitor C2 parallel with one another, the anode of diode Z1 connects Ground, cathode are connected between resistance R6 and MCU10, and diode Z1, resistance R6 and capacitor C2 form the first detection circuit, are used for The state of the first electromagnetic switch valve 1 is detected, MCU10 passes through the high and low level detected and judged.

Similarly, the second driving circuit includes capacitor C3, and the anode of capacitor C3 is connect with the MCU10, leading between the two Cross resistance R11 ground connection；The cathode of capacitor C3 is connect by resistance R10 with the base stage of amplifier Q4, passes through diode between the two D4 ground connection；The emitter of amplifier Q4 is grounded；The collector of amplifier Q4 by resistance R9 and resistance R8 respectively with triode Q2 Base stage connected with emitter, the emitter of triode Q2 passes sequentially through resistance R7, diode D3 and second electromagnetic switch Valve 2 connects, the plus earth of diode D3；The cathode of the collector of triode Q2 and the second electromagnetic switch valve 2 and diode D3 The collector of connection, triode Q2 is connect by resistance R12 with MCU10.It further include diode Z2 and capacitor C4 parallel with one another, The plus earth of diode Z2, cathode are connected between resistance R12 and MCU10.Diode Z2, resistance R12 and capacitor C4 group At the second detection circuit, for detecting the state of the second electromagnetic switch valve 2, MCU10 passes through the high and low level detected and is sentenced It is disconnected.

When driving the first electromagnetic switch valve 1 and the second electromagnetic switch valve 2, pass through logical pulse square wave, partition direct current respectively First driving circuit of voltage and the driving of the second driving circuit, pulse square wave, two electromagnetic switch valves are exported when MCU10 is normal It can work normally, even if interfering greatly since ignition energy is big, when MCU10 is disturbed or crashes, MCU10 is with direct current High level output is pressed, driving circuit can not receive open instructions and not execute work, and electromagnetic switch valve still in off position, ensure that Equipment and personal safety.

The enforceable structure of first driving circuit and the second driving circuit is more, can be realized by capacitor logical exchange every The function of direct current, remaining element can be adjusted as needed.First driving circuit and the second driving circuit pass through capacitor respectively C1 and capacitor C3 are isolated, and exchange stopping direct current is led to, and structure is simple.

The ionic flame detection blowout protection circuit 14 includes that circuit, flame detection circuit occurs with ion, further includes Be connected to the isolating high-pressure ignitor 11 and ion occur the first protection circuit between circuit, be connected to flame detection circuit with The second protection circuit between MCU10.

Comparator IC1A is equipped in the flame detection circuit, flame detection circuit is equipped with to be connected with the isolating high-pressure ignitor 11 The flame sensing signal input terminal connect, the first protection circuit includes the optocoupler being connected between comparator IC1A and MCU10 ISO1, the second protection circuit include the ceramic discharge being connected between flame sensing signal input terminal and ion generation circuit Pipe ZD1, capacitor C6 and capacitor C7；Electron ion occurs to be equipped in circuit by triode Q7, capacitor C9, resistance R20 and transformer T1 The high-frequency resonant booster circuit of composition.

A kind of commercial gas premixes ratio control energy-saving steam cabinet control method entirely, comprising the following steps:

1) steamer starts, and passes through residual gas 10 seconds in 4 blowing burner 6 of frequency controlling fan；

2) residual fire is first judged whether there is before igniting, not lights a fire if any residual fire and do not open the first, second electromagnetic switch valve, Guarantee that detonation does not occur in igniting；

3) MCU10 passes through the first driving circuit and the second driving circuit detection the first electromagnetic switch valve 1 and the second electricity respectively 2 working condition of magnetic switch valve, wherein the detection of the first electromagnetic switch valve 1 is realized by resistance R6, diode Z1, capacitor C2；Second The detection of electromagnetic switch valve 2 is realized by resistance R12, diode Z2, capacitor C4；As the first electromagnetic switch valve 1 or the second electromagnetism are opened Closing valve 2 wherein to have all the way is that arrestment starts and alarms high level immediately；As being all that low level represents the first electromagnetic switch valve 1 It is normal with 2 working condition of the second electromagnetic switch valve；

4) first start the first electromagnetic switch valve and start the second electromagnetic switch valve 2 after 1,1 second, and start isolating high-pressure ignitor simultaneously 11 igniting, frequency controlling fan 4 start kindling material rotation speed of fan FU, and spark delay is no more than 5 seconds；If light a fire 5 seconds MCU10 by from Sub- fire defector blowout protection circuit 14 all can't detect flare up fire, and MCU10 closes all solenoid valves and warning note, frequency conversion Adjustable speed fan 4 enters post-purge 60 seconds, guarantees that equipment will not be because of explosion accident caused by largely leaking combustion gas chance Mars；

5) as MCU10 detects that 6 normal combustion of burner has flare up fire, frequency controlling fan 4 is exported by small fire ratio When rotation speed of fan FL when being exported to high fire ratio rotation speed of fan FH gradually adjust by linear aperture, then allow burner 6 with maximum Power burning, guarantee will not because moment gas output too greatly caused by igniting not, moment is for hypoxgia is flame-out or deflagration phenomenon；

6) MCU10 such as detects blowout protection circuit 14 by ionic flame and finds burner accident extinguishing in combustion process, All solenoid valves are automatically closed, frequency controlling fan 4 enters 60 seconds post-purges, and warning note.

High-tension ignition electric appliance 11 includes high voltage package and high-tension ignition circuit.Have when fuel gas buring using flame and has ion And there is unilateal conduction characteristic, flame detection circuit realizes the detection to flame using its characteristic.When by isolating high-pressure ignitor 11, Ignition electrode is transported to by high voltage package after 500 volts of electron ion output, is gone forward side by side by ignition electrode 5 and 6 shell of burner forming circuit Row firing action, while ignition electrode 5 is also used as fire defector needle, when having flame in burner 6, electron ion voltage is added in igniting Needle forms ionic current circuit by flame and burner housing, because flame has unilateal conduction characteristic, the ion voltage of ignition electrode Become negative DC voltage, negative DC voltage transfers back to ratio through high voltage package, resistance R18, resistance R19, resistance R21 as flare up fire Compared with device IC1A, comparator IC1A detects the negative voltage of flare up fire and the rear output switching activity compared with reference voltage, passes through optocoupler ISO1 isolated transmission is maintained open all solenoid valves to MCU10 if MCU10 detects flare up fire, if detecting no flame All solenoid valves are closed when signal in one second, no largely leakage causes safety accident after guaranteeing fray-out of flame.

When having flame, ionic current successively passes through ion and circuit 1, flame sensing signal input terminal a, high voltage package low pressure occurs End, ignition electrode 5, burner housing and ground connection, forming circuit, then flame sensing signal input terminal a is negative pressure；When not without flame When, it is not formed into a loop, the voltage of flame sensing signal input terminal a is 500V alternating current.Comparator IC1A positive input terminal with Flame sensing signal input terminal a connection, negative input end ground connection, compared with negative input end and is overturn, comparator by positive input terminal The output end of IC1A issues flare up fire to MCU10, and MCU10 judges whether there is flame by the flare up fire.

Electromagnetic switch valve driving inhales by force signal by the main thermoelectricity magnet valve that MCU exports 500 milliseconds.Wherein, electromagnetic switch valve control In first driving circuit of driving circuit 13 processed, through capacitor C1 and resistance R4 driving amplifier Q3 and triode Q1, triode Q1 It exports full voltage and drives the first electromagnetic switch valve 1.First electromagnetic switch valve 1 obtains full voltage and inhales strength opening solenoid valve work by force Make, the driving pulse square wave that 500HZ is exported after 500 milliseconds maintains signal, and the half for exporting full voltage at this time maintains first The opening of electromagnetic switch valve 1；When being crashed such as MCU10 by strong jamming, it is possible to export high level, at this moment because have capacitor C1, C3 every From (capacitance characteristic is logical exchange stopping direct current), the first driving circuit cannot get driving signal and the first electromagnetic switch valve 1 be automatically closed, It ensure that a large amount of gas leak safety accidents caused by crashing because of MCU10.The driving method of second electromagnetic switch valve 2 is the same as the first electromagnetism Switch valve 1.

Both first electromagnetic switch valve 1 and the second electromagnetic switch valve 2 are maintained open state by 1/2 full voltage, reduce Calorific value under its long-time service, temperature temperature rise is very low, can lengthen in commercial gas kitchen tools hot environment use The service life of solenoid valve.

Water level in water tank 7 is detected by water level detecting needle 72, and water level detecting needle 72 is connected by optocoupler ISO2 and MCU10 It connects.Water level detecting provides AC12V alternation pulsating current through R30, R29, R28 to water level detecting needle 72 by Industrial Frequency Transformer T2, when When having water not have water level detecting needle 72, electric current is by water and 7 link circuit of water tank to ground, and optocoupler ISO2 is because having electric current to flow through due to work Make, the receiving end optocoupler ISO2 receives signal simultaneously, and because transmitting terminal is power frequency 50Hz signal, what receiving end received is also 50Hz pulsation Signal, it is to have water that MCU10, which persistently receives 50Hz fluctuating signal, and what is such as received is not to continue 50Hz fluctuating signal, and MCU10 is judged as Water shortage, output order close burning, and warning note.

The safety protection program in addition, accident power-off built in MCU10 is sent a telegram here again, MCU10 self-shield when accident power-off is sent a telegram here again, It will not start automatically, it is necessary to manually start, not will cause safety accident when ensure that unattended.

MCU10 detects vapor (steam) temperature by temperature sensor 95.The driving of GAS/AIR Proportional valve 3 is exported by MCU10 Pwm signal, the revolving speed of control frequency controlling fan 4 adjust the flow of air to control the combustion gas of 3 aperture of GAS/AIR Proportional valve Input quantity is premixed, the combustion power for automatically adjusting burner 6 according to vapor (steam) temperature is realized.When burning goes to high fire combustion by kindling material It is gradually gently to be added to maximum combustion power by small when burning, is thus not in because flame opens to the maximum suddenly, air and combustion The deflagration phenomenon that gas mixing ratio occurs when unreasonable；When vapor (steam) temperature reaches target temperature, adjust automatically frequency controlling fan 4 Revolving speed ratio adjustment GAS/AIR Proportional valve 3 gently adjust back by high fire combustion power to small fire power burning, if MCU10 inspection When measuring vapor (steam) temperature=(target temperature-return difference temperature), the revolving speed ratio of adjust automatically frequency controlling fan 4 adjustment combustion gas/ AIR Proportional valve 3, which is gently adjusted back by small fire combustion power to high fire power, to burn, and makes vapor (steam) temperature fast constant temperature in target temperature ± (1 DEG C~2 DEG C) guarantee that steam box 8 has enough steam and equilibrium temperature, do not generate afterburning；Simultaneously after system start-up Start circulating pump 91 immediately, and circulating pump 91 is allowed to operate always, the Steam Recovery in steam box 8 is heated to heat exchanger 121 Return to steam box 8 with live steam again afterwards, steam is thermostat flow steam in such steam box 8, and steam pressure only in steam box 8 is super It is arranged when 300Pa by relief valve automatic leakage, steam mends warm rear cabinet body-internal-circulation quick always when normal, and food is quick in minute-pressure The nutritional ingredient of food is quickly lockked under the steam of temperature flowing and is cooked, and guarantees the mouthfeel and nutrition of food；It is normal compared to market Advise 60% or more steamer energy conservation.

Combine most preferred embodiment that the utility model is described above, but the utility model is not limited to above take off The embodiment shown, and modification, equivalent combinations that various essence according to the present utility model carry out should be covered.

Claims (6)

1. a kind of commercial gas premix full ratio control energy-saving steam cabinet, including steam box (8) and be equipped with burner (6) water tank (7), An ignition electrode (5) is equipped in burner (6), it is characterised in that: further include opening along the first electromagnetism that combustion gas flow direction is set gradually It closes valve (1), the second electromagnetic switch valve (2), GAS/AIR Proportional valve (3), frequency controlling fan (4) and is located in burner (6) Mixed gas outlet, frequency controlling fan (4) circuit connection has MCU (10), the first electromagnetic switch valve (1) and the second electromagnetic switch Valve (2), which passes through, can lead to pulse square wave, the electromagnetic switch valve of partition DC voltage controls driving circuit (13) and connect with MCU (10), The MCU (10) passes sequentially through ionic flame detection blowout protection circuit (14) and isolating high-pressure ignitor (11) and the ignition electrode (5) Connection.

2. a kind of commercial gas according to claim 1 premixes ratio control energy-saving steam cabinet entirely, which is characterized in that the electricity It includes identical first driving circuit of structure and the second driving circuit, the first driving circuit that magnetic switch valve, which controls driving circuit (13), Including capacitor C1, the anode of capacitor C1 is connect with the MCU (10), being grounded by resistance R5 between the two；Capacitor C1's is negative Pole is connect by resistance R4 with the base stage of amplifier Q3, is grounded between capacitor C1 and resistance R4 by diode D2；Amplifier Q3 Emitter ground connection；The collector of amplifier Q3 is connected with the base stage of triode Q1 and emitter respectively by resistance R3 and resistance R2 It connects, the emitter of triode Q1 passes sequentially through resistance R1, diode D1 and connect with first electromagnetic switch valve (1), diode The plus earth of D1；The collector of triode Q1 is connect with the cathode of the first electromagnetic switch valve (1) and diode D1, triode Q1 Collector connect with MCU (10) by resistance R6；It further include diode Z1 and capacitor C2 parallel with one another, diode Z1 is just Pole ground connection, cathode are connected between resistance R6 and MCU (10).

3. a kind of commercial gas according to claim 1 or 2 premixes ratio control energy-saving steam cabinet entirely, which is characterized in that institute Stating ionic flame detection blowout protection circuit (14) includes that circuit, flame detection circuit occurs with ion, further includes being connected to institute Isolating high-pressure ignitor (11) and ion occur between circuit first is stated to protect circuit, be connected to flame detection circuit and MCU (10) Between second protection circuit.

4. a kind of commercial gas according to claim 3 premixes ratio control energy-saving steam cabinet entirely, which is characterized in that the fire Comparator IC1A is equipped in flame detection circuit, flame detection circuit is equipped with the fire defector connecting with the isolating high-pressure ignitor (11) Signal input part, the first protection circuit includes the optocoupler ISO1 being connected between comparator IC1A and MCU (10), and described the Two protection circuits include the ceramic discharge tube ZD1 being connected between flame sensing signal input terminal and ion generation circuit, capacitor C6 and capacitor C7；Electron ion occurs to be equipped with the high frequency being made of triode Q7, capacitor C9, resistance R20 and transformer T1 in circuit Resonance step-up circuit.

5. a kind of commercial gas according to claim 1 premixes ratio control energy-saving steam cabinet entirely, which is characterized in that the water Water level detecting needle (72) are equipped in case (7), water tank (7) ground connection, water level detecting needle (72), which is connected with, to be examined in water level higher than water level To the optocoupler ISO2 of the MCU (10) transmitting power frequency component when stylus (72), water level detecting needle (72) is connected with Industrial Frequency Transformer T2。

6. a kind of commercial gas according to claim 1 premixes ratio control energy-saving steam cabinet entirely, which is characterized in that including inciting somebody to action The interior Steam Recovery of steam box (8) and the steam circulation (9) that steam box (8) are refilled after mixing with water tank (7) interior steam, are also wrapped Include the heat-exchange system (12) being connected between burner (6) and steam circulation (9).