CN202040989U - Control circuit of adjustable alternating current fan rotational speed of gas heater - Google Patents
Control circuit of adjustable alternating current fan rotational speed of gas heater Download PDFInfo
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- CN202040989U CN202040989U CN2011200470210U CN201120047021U CN202040989U CN 202040989 U CN202040989 U CN 202040989U CN 2011200470210 U CN2011200470210 U CN 2011200470210U CN 201120047021 U CN201120047021 U CN 201120047021U CN 202040989 U CN202040989 U CN 202040989U
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- 239000007789 gas Substances 0.000 claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 230000002457 bidirectional effect Effects 0.000 claims description 14
- 239000000567 combustion gas Substances 0.000 claims description 14
- 210000000635 valve cell Anatomy 0.000 claims description 10
- 230000003750 conditioning effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 238000002485 combustion reaction Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000000779 smoke Substances 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
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Abstract
The utility model relates to a control circuit of adjustable alternating current fan rotational speed of gas heater, characteristics are including the zero cross detection unit who detects zero cross signal, receive the signal of zero cross detection unit output and the central control system unit that the fan speed signal measured and handled, receive the fan drive unit of the fan speed governing signal of central control system unit output and receive the gas electronic proportional valve of the gas regulating signal of central control system unit output and transfer the valve unit. The beneficial effects are as follows: the central control system unit outputs FPWM signals with different duty ratios through the rotating speed signals fed back by the fan to control the fan driving unit to realize stepless adjustment of the rotating speed of the alternating current motor, the air quantity of the fan is matched with the combustion working condition of the gas electronic proportional valve regulating valve unit to control the output gas, and finally the gas water heater maintains high-energy efficiency operation in the process of changing the thermal load, so that the energy utilization rate is improved, and the emission of harmful gases such as CO in smoke is reduced.
Description
Technical field
The utility model relates to gas heater control technology field, and particularly a kind of is the control circuit of the adjustable AC blower fan rotating speed of gas heater of smoke evacuation system power with the alternating current generator.
Background technology
The non-chimney flue type gas heater of tradition rotates the discharging that realizes flue gas behind the primary air that burns and secondary air distribution and the combustion heat-exchange with alternating current generator or direct current generator impeller.As then cost is higher to use direct current generator, and the anti-environment temperature of direct current generator is relatively poor, is difficult to realize strong odd test structure.As then cost is lower to use common alternating current generator, but wind speed fixes, and how fast alternating current generator can be provided with three sections wind speed at most, and the thermal efficiency can not reach optimum when water heater working was between maximum and minimum thermal load in the case, caused energy waste.
Summary of the invention
But being to overcome the problems referred to above, the purpose of this utility model provide a kind of low cost stepless speed regulation to realize the control circuit of the adjustable AC blower fan rotating speed of gas heater that air quantity is regulated.
In order to achieve the above object, the technical solution of the utility model is: the control circuit of a kind of gas heater is adjustable AC blower fan rotating speed, it is characterized in that comprising the zero passage detection unit that detects zero cross signal, the signal of reception zero passage detection unit output and blower fan tachometer signal and the central control system unit of handling receive the blower fan driver element of the fan speed regulation signal of exporting the central control system unit and the combustion gas electronics proportioning valve of the combustion gas conditioning signal that reception central control system unit is exported and transfer valve cell.
Described central control system unit comprises single-chip microcomputer and the 18 resistance, and the model of single-chip microcomputer is REN10,16 pin of the 18 resistance one termination single-chip microcomputer, the other end machine velometer of giving a dinner for a visitor from afar.
Described blower fan driver element circuit comprises first to fourth resistance, first electric capacity, bidirectional triode thyristor and photoelectrical coupler; Wherein an end of the 4th resistance is electrically connected with the 2nd pin of photoelectrical coupler, and the other end is electrically connected with the 23rd pin of single-chip microcomputer; One end of second resistance is connected with live wire, and the other end is electrically connected with the 6th pin of photoelectrical coupler; One end of the 3rd resistance is electrically connected with the gate pole G of bidirectional triode thyristor, and the other end is electrically connected with the 4th pin of photoelectrical coupler; An end is connected live wire after first resistance and first capacitances in series, and the other end connects the input of blower fan; The electrode T1 of bidirectional triode thyristor connects live wire, and the electrode T2 of bidirectional triode thyristor connects the input of blower fan; The 1st pin of photoelectrical coupler connects power supply.
Described zero passage detection element circuit comprises the 5th to the tenth resistance, second electric capacity, the 3rd electric capacity and voltage comparator; Wherein the tenth resistance one end is electrically connected with the 24th pin of single-chip microcomputer, and the other end is electrically connected with the 7th pin of voltage comparator; The 9th resistance one end is connected with power supply, and the other end connects the 7th pin of voltage comparator; The 3rd electric capacity electric capacity one end is electrically connected other end ground connection with the 7th pin of voltage comparator; The 6th resistance is connected power supply with the 8th resistance series connection back one end, other end ground connection, and its series connection point connects "+" input of voltage comparator; The 5th resistance is connected the zero passage detection point with the 7th resistance series connection back one end, other end ground connection, and its series connection point connects "-" input of voltage comparator and an end of second electric capacity, the other end ground connection of second electric capacity respectively.
Described combustion gas electronics proportioning valve transfers valve cell to comprise the 11 to the 17 resistance, the 4th to the 6th electric capacity, diode, first triode, second triode and voltage comparator; Wherein an end of the 17 resistance is connected with "+" input of voltage comparator respectively with an end of the 6th electric capacity, and the other end of the two or seven resistance is electrically connected with single-chip microcomputer the 13rd pin, the other end ground connection of the 6th electric capacity; One end of the 5th electric capacity is connected other end ground connection with "-" input of voltage comparator; One end of the 13 resistance, the 14 resistance, the 16 resistance, the 4th electric capacity and the base stage of first triode connect power supply, the colelctor electrode of another termination second triode of the 13 resistance, the output of another termination voltage comparator of the 14 resistance, "-" input of another termination voltage comparator of the 16 resistance, the other end ground connection of the 4th electric capacity; The negative pole of one termination proportioning valve of the 11 resistance and the 15 resistance, the other end ground connection of the 11 resistance, "-" input of another termination voltage comparator of the 15 resistance; The emitter stage of first triode and a termination power of the 12 resistance, the colelctor electrode of first triode connects the negative terminal of diode, and the base stage of first triode is connected with the other end of the 12 resistance; The base stage of second triode is connected with the output of voltage comparator, the grounded emitter of second triode; The plus earth of diode, the negative pole of diode is connected with the positive pole of proportioning valve.
The utility model has following beneficial effect compared with prior art: the stepless adjustment of rotating speed of alternating current generator is realized in the central control system unit by the FPWM signal controlling blower fan driver element of the tach signal output different duty of blower fan feedback, make fan delivery coupling combustion gas electronics proportioning valve transfer the combustion conditions of valve cell control output combustion gas, the final gas heater of realizing is kept the high energy efficiency running in thermic load size variation process, thereby the raising energy utilization rate reduces in the flue gas noxious gas emissions such as CO.
Description of drawings
Fig. 1 is a circuit block diagram of the present utility model;
Fig. 2 is the circuit theory diagrams of blower fan driver element among Fig. 1;
Fig. 3 is the circuit theory diagrams of zero passage detection unit among Fig. 1;
Fig. 4 is the circuit theory diagrams that central control system unit and combustion gas electronics ratio are transferred valve cell among Fig. 1;
Fig. 5 is example 1 an application product structure chart of the present utility model;
Fig. 6 is example 2 application product structure charts of the present utility model.
The specific embodiment
The utility model is described in further detail below in conjunction with accompanying drawing and preferred embodiment:
As shown in Figure 1, the control circuit of the utility model gas heater is adjustable AC blower fan rotating speed, comprise the zero passage detection unit 2 that detects zero cross signal, the signal of reception zero passage detection unit output and blower fan tachometer signal and the central control system unit of handling 4 receive the blower fan driver element 1 of the fan speed regulation signal of exporting the central control system unit and the combustion gas electronics proportioning valve of the combustion gas conditioning signal that reception central control system unit is exported and transfer valve cell 3.During work, zero passage detection unit 2 feedback zero cross signals are given central control system unit 4, central control system unit 4 is by the stepless adjustment of rotating speed of the pwm signal control blower fan driver element 1 realization alternating current generator of the tach signal output different duty of blower fan feedback simultaneously, and this rotating speed is used for mating central control system unit 4 and exports to the current regulating signal that combustion gas electronics proportioning valve is transferred valve cell 3.
As shown in Figure 4, central control system unit 4 comprises single-chip microcomputer IC2 and the 18 resistance R 18, and the model of single-chip microcomputer is REN10,16 pin of the 18 resistance one termination single-chip microcomputer, the other end machine velometer of giving a dinner for a visitor from afar.
Combustion gas electronics proportioning valve transfers valve cell 3 to comprise the 11 to the 17 resistance R 11-R17, the 4th to the 6th capacitor C 4-C6, diode D1, the first triode Q1, the second triode Q2 and voltage comparator U8B; Wherein an end of the 17 resistance R 17 is connected with "+" input of voltage comparator U8B respectively with an end of the 6th capacitor C 6, and the other end of the two or seven resistance R 17 is electrically connected with single-chip microcomputer U1 the 13rd pin, the other end ground connection of the 6th capacitor C 6; One end of the 5th capacitor C 5 is connected other end ground connection with "-" input of voltage comparator U8B; The 13 resistance R the 13, the 14 resistance R the 14, the 16 resistance R 16, an end of the 4th capacitor C 4 and the base stage of the first triode Q1 meet power supply+12V, the colelctor electrode of another termination second triode Q2 of the 13 resistance R 13, the output of another termination voltage comparator U8B of the 14 resistance R 14, "-" input of another termination voltage comparator U8B of the 16 resistance R 16, the other end ground connection of the 4th capacitor C 4; The negative pole BLF-of one termination proportioning valve of the 11 resistance R 11 and the 15 resistance R 15, the other end ground connection of the 11 resistance R 11, "-" input of another termination voltage comparator U8B of the 15 resistance R 15; The emitter stage of the first triode Q1 and the one termination power+24V of the 12 resistance R 12, the colelctor electrode of the first triode Q1 connects the negative terminal of diode D1, and the base stage of the first triode Q1 is connected with the other end of the 12 resistance R 12; The base stage of the second triode Q2 is connected with the output of voltage comparator U8B, the grounded emitter of the second triode Q2; The plus earth of diode D1, the negative pole of diode D1 is connected with the anodal BLF+ of proportioning valve.
As shown in Figure 2, blower fan driver element circuit 1 comprises first to fourth resistance R 1-R4, first capacitor C 1, bidirectional triode thyristor Q and photoelectrical coupler IC1; Wherein an end of the 4th resistance R 4 is electrically connected with the 2nd pin of photoelectrical coupler IC1, and the other end is electrically connected with the 23rd pin of single-chip microcomputer IC2; One end of second resistance R 2 is connected with live wire L, and the other end is electrically connected with the 6th pin of photoelectrical coupler IC1; One end of the 3rd resistance R 3 is electrically connected with the gate pole G of bidirectional triode thyristor Q, and the other end is electrically connected with the 4th pin of photoelectrical coupler IC1; First resistance R 1 is connected live wire L with first capacitor C, 1 series connection back, one end, and the other end connects the input FJ of blower fan; The electrode T1 of bidirectional triode thyristor Q connects live wire L, and the electrode T2 of bidirectional triode thyristor Q connects the input FJ of blower fan; The 1st pin of photoelectrical coupler IC1 connects power supply VCC.
As shown in Figure 3, zero passage detection unit 2 circuit comprise the 5th to the tenth resistance R 5-R10, second capacitor C 2, the 3rd capacitor C 3 and voltage comparator ic 2B; Wherein the tenth resistance R 10 1 ends are electrically connected with the 24th pin of single-chip microcomputer IC1, and the other end is electrically connected with the 7th pin of voltage comparator ic 2B; The 9th resistance R 9 one ends are connected with power supply VCC, and the other end connects the 7th pin of voltage comparator ic 2B; The 3rd electric capacity capacitor C 3 one ends are electrically connected other end ground connection with the 7th pin of voltage comparator ic 2B; The 6th resistance R 6 is connected power supply VCC with the 8th resistance R 8 series connection backs one end, other end ground connection, and its series connection point connects "+" input of voltage comparator ic 2B; The 5th resistance R 5 is connected zero passage detection point GLJC with the 7th resistance R 7 series connection backs one end, other end ground connection, and its series connection point connects "-" input of voltage comparator ic 2B and an end of second capacitor C 2, the other end ground connection of second electric capacity respectively.
During work, the effect of zero passage detection element circuit 2 is to provide a standard to single-chip microcomputer IC1, the starting point of this standard is a no-voltage, when the 220V alternating voltage by negative half period during to the conversion of positive half cycle, the output of voltage comparator ic 2B send a pulse signal can for the 24th human hair combing waste of single-chip microcomputer IC2, be external interrupt signal INT0, through the size of single-chip microcomputer IC2 after certain time-delay with this standard adjustment controllable silicon Q angle of flow, be the FPWM signal of the 24th pin of single-chip microcomputer IC2 to the corresponding dutycycle of blower fan driver element 1 output, be transferred to bidirectional triode thyristor Q behind this signal process photoelectrical coupler IC1, realize the conducting control of single-chip microcomputer IC2 to bidirectional triode thyristor Q, be that rotation speed of fan all has the corresponding angle of flow from high to low, and the ON time of each angle of flow begins to calculate from no-voltage, ON time is different, the size of conducting angle is just different, thereby the rotating speed of blower fan is just different, thereby has reached the purpose of controllable rotation speed.Adjust accordingly in the wind speed process according to different loads at blower fan, single-chip microcomputer IC2 constantly detects the rotation speed of fan signal to realize the accurate control to rotation speed of fan by its 16th pin.
Utility model is applied in sees Fig. 5 and Fig. 6 on the gas heater, controller circuit board 1 is integrated, and blower fan driver element 1, combustion gas electronics proportioning valve are transferred valve cell 3, zero passage detection unit 2 and central control system unit 4, the rotation speed of fan signal feedback device is installed on the AC blower fan 2.During gas water heater working, when the user sets water heater at the maximum load state, proportioning valve 3 aperture maximums, this moment the air quantity maximum, the thermal efficiency is the highest, when the user is set in the minimum thermal load condition, proportioning valve 3 aperture minimums, this moment the air quantity minimum, be complementary with load, efficient also satisfies the requirement of gas heater efficiency standard GB20665, the thermic load of setting as the user maximum with minimum between the two the time, the central control system unit is by the stepless adjustment of rotating speed of the pwm signal control blower fan driver element realization alternating current generator of the tach signal output different duty of blower fan feedback, and the corresponding one by one coupling of air quantity this moment makes the thermal efficiency reach peak under the prerequisite that satisfies the thermal property index.
Claims (5)
1. the control circuit of the adjustable AC blower fan rotating speed of gas heater, it is characterized in that comprising the zero passage detection unit (2) that detects zero cross signal, the signal of reception zero passage detection unit output and blower fan tachometer signal and the central control system unit of handling (4) receive the blower fan driver element (1) of the fan speed regulation signal of exporting the central control system unit and the combustion gas electronics proportioning valve of the combustion gas conditioning signal that reception central control system unit is exported and transfer valve cell (3).
2. the control circuit of the adjustable AC blower fan rotating speed of gas heater according to claim 1, it is characterized in that described central control system unit (4) comprises single-chip microcomputer (IC2) and the 18 resistance (R18), the model of single-chip microcomputer is REN10,16 pin of the 18 resistance one termination single-chip microcomputer, the other end machine velometer of giving a dinner for a visitor from afar.
3. the control circuit of the adjustable AC blower fan rotating speed of gas heater according to claim 1 and 2 is characterized in that described blower fan driver element circuit (1) comprises first to fourth resistance (R1-R4), first electric capacity (C1), bidirectional triode thyristor (Q) and photoelectrical coupler (IC1); Wherein an end of the 4th resistance (R4) is electrically connected with the 2nd pin of photoelectrical coupler (IC1), and the other end is electrically connected with the 23rd pin of single-chip microcomputer (IC2); One end of second resistance (R2) is connected with live wire (L), and the other end is electrically connected with the 6th pin of photoelectrical coupler (IC1); One end of the 3rd resistance (R3) is electrically connected with the gate pole G of bidirectional triode thyristor (Q), and the other end is electrically connected with the 4th pin of photoelectrical coupler (IC1); First resistance (R1) is connected live wire (L) with first electric capacity (C1) series connection back, one end, and the other end connects the input (FJ) of blower fan; The electrode T1 of bidirectional triode thyristor (Q) connects live wire (L), and the electrode T2 of bidirectional triode thyristor (Q) connects the input (FJ) of blower fan; The 1st pin of photoelectrical coupler (IC1) connects power supply (VCC).
4. the control circuit of the adjustable AC blower fan rotating speed of gas heater according to claim 1 and 2 is characterized in that described zero passage detection unit (2) circuit comprises the 5th to the tenth resistance (R5-R10), second electric capacity (C2), the 3rd electric capacity (C3) and voltage comparator (IC2B); Wherein the tenth resistance (R10) end is electrically connected with the 24th pin of single-chip microcomputer (IC1), and the other end is electrically connected with the 7th pin of voltage comparator (IC2B); The 9th resistance (R9) end is connected with power supply (VCC), and the other end connects the 7th pin of voltage comparator (IC2B); The 3rd electric capacity electric capacity (C3) end is electrically connected other end ground connection with the 7th pin of voltage comparator (IC2B); The 6th resistance (R6) is connected power supply (VCC) with the 8th resistance (R8) series connection back one end, other end ground connection, and its series connection point connects "+" input of voltage comparator (IC2B); The 5th resistance (R5) is connected zero passage detection point (GLJC) with the 7th resistance (R7) series connection back one end, other end ground connection, its series connection point connects "-" input of voltage comparator (IC2B) and an end of second electric capacity (C2), the other end ground connection of second electric capacity respectively.
5. the control circuit of the adjustable AC blower fan rotating speed of gas heater according to claim 1 and 2 is characterized in that described combustion gas electronics proportioning valve accent valve cell (3) comprises the 11 to the 17 resistance (R11-R17), the 4th to the 6th electric capacity (C4-C6), diode (D1), first triode (Q1), second triode (Q2) and voltage comparator (U8B); Wherein an end of the 17 resistance (R17) is connected with "+" input of voltage comparator (U8B) respectively with an end of the 6th electric capacity (C6), the other end of the two or seven resistance (R17) is electrically connected with single-chip microcomputer (U1) the 13rd pin, the other end ground connection of the 6th electric capacity (C6); One end of the 5th electric capacity (C5) is connected other end ground connection with "-" input of voltage comparator (U8B); One end of the 13 resistance (R13), the 14 resistance (R14), the 16 resistance (R16), the 4th electric capacity (C4) and the base stage of first triode (Q1) connect power supply (+12V), the colelctor electrode of another termination second triode (Q2) of the 13 resistance (R13), the output of another termination voltage comparator (U8B) of the 14 resistance (R14), "-" input of another termination voltage comparator (U8B) of the 16 resistance (R16), the other end ground connection of the 4th electric capacity (C4); The negative pole (BLF-) of one termination proportioning valve of the 11 resistance (R11) and the 15 resistance (R15), the other end ground connection of the 11 resistance (R11), "-" input of another termination voltage comparator (U8B) of the 15 resistance (R15); The emitter stage of first triode (Q1) and a termination power of the 12 resistance (R12) (+24V), the colelctor electrode of first triode (Q1) connects the negative terminal of diode (D1), and the base stage of first triode (Q1) is connected with the other end of the 12 resistance (R12); The base stage of second triode (Q2) is connected with the output of voltage comparator (U8B), the grounded emitter of second triode (Q2); The plus earth of diode (D1), the negative pole of diode (D1) is connected with the positive pole (BLF+) of proportioning valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200470210U CN202040989U (en) | 2011-02-25 | 2011-02-25 | Control circuit of adjustable alternating current fan rotational speed of gas heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200470210U CN202040989U (en) | 2011-02-25 | 2011-02-25 | Control circuit of adjustable alternating current fan rotational speed of gas heater |
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| Publication Number | Publication Date |
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| CN202040989U true CN202040989U (en) | 2011-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011200470210U Expired - Lifetime CN202040989U (en) | 2011-02-25 | 2011-02-25 | Control circuit of adjustable alternating current fan rotational speed of gas heater |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104500429A (en) * | 2014-11-20 | 2015-04-08 | 广州腾世智能控制系统有限公司 | Speed control device and speed control method of shaded pole fan for gas-heating hot water boiler |
| CN104917440A (en) * | 2015-06-29 | 2015-09-16 | 郑长青 | Control circuit of series motor |
| CN105278412A (en) * | 2015-10-30 | 2016-01-27 | 青岛海尔科技有限公司 | Gas stove stepless fire adjustment control method, device and gas stove |
| CN109442730A (en) * | 2018-12-15 | 2019-03-08 | 成都前锋电子有限责任公司 | A kind of upper odd test gas instantaneous water heater |
-
2011
- 2011-02-25 CN CN2011200470210U patent/CN202040989U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104500429A (en) * | 2014-11-20 | 2015-04-08 | 广州腾世智能控制系统有限公司 | Speed control device and speed control method of shaded pole fan for gas-heating hot water boiler |
| CN104500429B (en) * | 2014-11-20 | 2016-08-24 | 广州腾世智能控制系统有限公司 | The speed-regulating control device of the split-pole blower fan of gas-heating water heater and method |
| CN104917440A (en) * | 2015-06-29 | 2015-09-16 | 郑长青 | Control circuit of series motor |
| CN104917440B (en) * | 2015-06-29 | 2018-04-13 | 郑长青 | The control circuit of series excitation type motor |
| CN105278412A (en) * | 2015-10-30 | 2016-01-27 | 青岛海尔科技有限公司 | Gas stove stepless fire adjustment control method, device and gas stove |
| CN109442730A (en) * | 2018-12-15 | 2019-03-08 | 成都前锋电子有限责任公司 | A kind of upper odd test gas instantaneous water heater |
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Owner name: MIDEA GROUP CO., LTD. Free format text: FORMER NAME: MEIDI GROUP CO. LTD. |
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| CP03 | Change of name, title or address |
Address after: 528311 Guangdong, Foshan, Beijiao, the United States, the United States and the United States on the avenue of the United States, the headquarters of the United States building B floor, District, 26-28 Patentee after: MIDEA GROUP Co.,Ltd. Address before: 528311 Beijiao, Foshan, Shunde District, the town of Guangdong, the United States Avenue, No. 6 Patentee before: Midea Group |
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| CX01 | Expiry of patent term |
Granted publication date: 20111116 |
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| CX01 | Expiry of patent term |