CN105509330B - Combustion power adjusting method for gas water heater - Google Patents
Combustion power adjusting method for gas water heater Download PDFInfo
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- CN105509330B CN105509330B CN201610000433.6A CN201610000433A CN105509330B CN 105509330 B CN105509330 B CN 105509330B CN 201610000433 A CN201610000433 A CN 201610000433A CN 105509330 B CN105509330 B CN 105509330B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
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- Feeding And Controlling Fuel (AREA)
Abstract
the invention discloses a combustion power adjusting method of a gas water heater, wherein the gas water heater comprises two hot water outlets and a cold water inlet, and the combustion power is controlled by the ratio of the outlet hot water flow of a second hot water outlet to the inlet cold water flow of the cold water inlet according to the adjusting sensitivity; when the ratio of the outlet hot water flow of the second hot water outlet to the inlet cold water flow of the cold water inlet is increased, controlling the combustion power to be reduced; otherwise, controlling the combustion power to increase; the temperature of cold water at the inlet of the cold water inlet controls and adjusts the sensitivity; when the temperature of the cold water at the inlet of the cold water inlet is reduced, the control and adjustment sensitivity is increased; conversely, the control adjustment sensitivity decreases. The method does not need a wired or wireless remote controller, can realize the remote regulation of the combustion power of the gas water heater, and has stable and reliable regulation result.
Description
Technical Field
The invention relates to a control technology of a gas water heater, in particular to a combustion power adjusting method of the gas water heater.
Background
If the temperature of the gas water heater is not properly set, great inconvenience is brought to people, particularly, when a user takes a shower, the temperature of the gas water heater without a wireless remote control or a remote wire control cannot be adjusted, and the gas water heater is easy to extinguish due to the fact that cold water is added by the water mixing valve. The temperature of the gas water heater is adjusted by adopting wireless remote control, and signals of a remote controller cannot be transmitted to the gas water heater on many occasions due to the limitation of the installation position. When a remote wire control mode is adopted, the special waterproof wired remote controller is high in cost, wires need to be buried in advance, the electronic wired remote controller works in a wet environment such as a bathroom for a long time, and the failure rate of the electronic wired remote controller is high.
disclosure of Invention
the invention aims to provide a solution for remotely controlling the combustion power of a gas water heater, namely a method for remotely controlling the combustion power of the gas water heater.
In order to achieve the above object, the present invention provides a combustion power adjusting method for a gas water heater, comprising:
The gas water heater comprises a controller, a counteractive flow sensor, a total flow sensor, a cold water temperature sensor, a gas flow control driving module, a first hot water outlet, a second hot water outlet and a cold water inlet.
The reaction flow sensor is arranged in front of the second hot water outlet and used for detecting the outlet hot water flow of the second hot water outlet; the total flow sensor is arranged behind the cold water inlet and used for detecting the inlet cold water flow of the cold water inlet; the cold water temperature sensor is arranged behind the cold water inlet and used for detecting the inlet cold water temperature of the cold water inlet.
The reaction flow sensor is electrically connected with the controller and is used for transmitting an outlet hot water flow signal of the second hot water outlet to the controller; the total flow sensor is electrically connected with the controller and is used for transmitting an inlet cold water flow signal of the cold water inlet to the controller; the cold water temperature sensor is electrically connected with the controller and is used for transmitting an inlet cold water temperature signal of the cold water inlet to the controller; the gas flow control driving module is electrically connected with the controller and used for controlling and changing the opening of the gas valve through the gas flow control driving module by the controller.
The combustion power adjusting method comprises the following steps: controlling combustion power according to the regulation sensitivity by the ratio of the outlet hot water flow of the second hot water outlet to the inlet cold water flow of the cold water inlet; when the ratio of the outlet hot water flow of the second hot water outlet to the inlet cold water flow of the cold water inlet is increased, controlling the combustion power to be reduced; otherwise, controlling the combustion power to increase; the temperature of cold water at the inlet of the cold water inlet controls and adjusts the sensitivity; when the temperature of the cold water at the inlet of the cold water inlet is reduced, the control and adjustment sensitivity is increased; conversely, the control adjustment sensitivity decreases. The combustion power is controlled by the opening degree of the gas valve.
the ratio of the outlet hot water flow of the second hot water outlet to the inlet cold water flow of the cold water inlet is adjusted and changed by the water mixing valve; 2 water inlets of the water mixing valve are respectively connected to a first hot water outlet and a second hot water outlet of the gas water heater through water pipes.
The ratio of the outlet hot water flow of the second hot water outlet to the inlet cold water flow of the cold water inlet is adjusted and changed by the first adjusting valve and the second adjusting valve; the water inlet of the first regulating valve is connected to a first hot water outlet of the gas water heater through a water pipe, and the water inlet of the second regulating valve is connected to a second hot water outlet of the gas water heater through a water pipe; the water outlets of the first regulating valve and the second regulating valve are communicated to form a water outlet end.
The sensitivity of the adjustment is according to formula
K T K KPerforming a calculation, wherein K is the tuning sensitivity; t0 is a compensation reference temperature value, the value range is 30-40, and the typical value is 35; k0 is a reference sensitivity coefficient, the value range is 0.4-1, and the typical value is 0.5; k1 is a sensitivity adjustment coefficient, and the value range is 0-0.03, and the typical value is 0.015.
the opening degree of the gas valve is controlled by an opening degree control value of the gas valve; the opening control value of the gas valve is according to the formula
P Q Q PminCalculating, wherein P is an opening control value of the gas valve; q2 is the outlet hot water flow of the second hot water outlet, Q0 is the inlet cold water flow of the cold water inlet; pmin is the minimum opening control value of the gas valve, and the value range is 0-0.5.
The combustion power adjusting method comprises the following steps:
step S1, initialization;
Step S2, sampling the outlet hot water flow of the second hot water outlet and the inlet cold water flow of the cold water inlet; sampling the temperature of cold water at the inlet of the cold water inlet;
Step S3, calculating and adjusting sensitivity;
Step S4, calculating an opening control value of the gas valve;
Step S5, changing the opening of the gas valve according to the opening control value of the gas valve, and controlling the combustion power of the gas water heater;
Step S6, other processing and waiting; when the next sampling timing arrives, the process proceeds to step S2.
the gas water heater also comprises a heat exchanger, a water pipe, a power module, a fan control driving module and an ignition control and flame detection module.
The invention has the advantages that wired or wireless remote controllers are not needed, the water valves are used for controlling the flow of two paths of hot water, and the method of adjusting the sensitivity according to the change of the temperature of inlet cold water is combined, so that the remote adjustment of the combustion power of the gas water heater is realized, and the adjustment result is stable and reliable.
Drawings
fig. 1 is a block diagram of a system embodiment 1 of a combustion power adjusting method of a gas water heater.
Fig. 2 is a structural block diagram of a system embodiment 2 of a combustion power adjusting method of a gas water heater.
fig. 3 is a schematic block diagram of a detection control circuit.
FIG. 4 is a flow chart of the controller calculating and adjusting the combustion power of the gas water heater.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
a block diagram of a system embodiment 1 of a combustion power adjustment method of a gas water heater is shown in fig. 1, and the system embodiment 1 is composed of a heat exchanger 101, a total flow sensor 201, a reaction flow sensor 202, a first hot water outlet 203, a second hot water outlet 204, a cold water inlet 205, a cold water temperature sensor 206, a mixing valve 301, a cold water pipe 401, a main hot water pipe 402, a first hot water pipe 403, a second hot water pipe 404, a first connection water pipe 405, a second connection water pipe 406, a mixed hot water pipe 407, and a water outlet nozzle 302.
The gas water heater is provided with 1 cold water inlet and 2 hot water outlets, and a cold water pipe 401 is connected between the cold water inlet 205 and the heat exchanger 101; one end of the first hot water pipe 403 is connected to the first hot water outlet 203, and the other end is connected to the water outlet end of the main hot water pipe 402; one end of the second hot water pipe 404 is connected to the second hot water outlet 204, and the other end is connected to the water outlet end of the main hot water pipe 402; the water inlet end of the main hot water pipe 402 is connected to the heat exchanger 101.
The reaction flow sensor 202 is arranged in front of the second hot water outlet 204 and is used for detecting the outlet hot water flow of the second hot water outlet; the total flow sensor 201 is installed behind the cold water inlet 205 and is used for detecting the inlet cold water flow of the cold water inlet 205; the cold water temperature sensor 206 is installed behind the cold water inlet 205. Specifically, the reaction flow sensor 202 is mounted on the second hot water pipe 404, the total flow sensor 201 is mounted on the cold water pipe 401, and the cold water temperature sensor 206 is mounted on the cold water pipe 401. Since the outlet hot water flow rate of the heat exchanger 101 corresponds to the inlet cold water flow rate, the total flow sensor 201 can also be installed on the main hot water pipe 402.
2 water inlets of the water mixing valve 301 are respectively connected to a first hot water outlet 203 and a second hot water outlet 204 of the gas water heater through a first connecting water pipe 405 and a second connecting water pipe 406; the water outlet of the mixing valve 301 is connected to the water outlet nozzle 302 by a mixing hot water pipe 407. When the mixing valve 301 is a cold water and hot water mixing valve, the first connecting water pipe 405 is connected to a hot water inlet of the mixing valve 301, and the second connecting water pipe 406 is connected to a cold water inlet of the mixing valve 301.
A structural block diagram of a system embodiment 2 of a combustion power regulating method of a gas water heater is shown in fig. 2, and the difference from embodiment 1 is that a first regulating valve 303 and a second regulating valve 304 are used instead of a water mixing valve 301; the water inlet of the first adjusting valve 303 is connected to the first hot water outlet 203 of the gas water heater through a first connecting water pipe 405, and the water inlet of the second adjusting valve 304 is connected to the second hot water outlet 204 of the gas water heater through a second connecting water pipe 406. The water outlets of the first regulating valve 303 and the second regulating valve 304 are communicated to form a water outlet end which is connected with a mixed hot water pipe 407.
The gas water heater further comprises a controller 210 and a gas flow control driving module 211, and a schematic block diagram of a gas water heater detection control circuit is shown in fig. 3. The total flow sensor 201 is provided with a total flow signal output terminal OUT for detecting the inlet cold water flow of the cold water inlet 205, the total flow signal is an electrical signal, and the type of the signal is pulse frequency, or voltage, or current. The reaction flow sensor 202 is provided with a second flow signal output end OUT2 for detecting the hot water flow at the outlet of the second hot water outlet 204, wherein the second flow signal is an electric signal, and the type of the signal is pulse frequency, voltage or current. The cold water temperature sensor 206 is provided with a cold water temperature signal output end OUT3 for detecting the temperature of the cold water at the inlet of the cold water inlet 205, the cold water temperature signal is an electric signal, and the type of the signal is a digital signal, or voltage, or current.
the gas flow control driving module 211 is provided with a gas valve driving signal input end IN4 for driving and controlling the opening degree of the gas valve, the gas valve driving signal is an electric signal, and the signal type is PWM pulse, or voltage, or current.
The controller 210 is provided with a total flow signal input end IN, a second flow signal input end IN2, a cold water temperature signal input end IN3 and a gas valve driving signal output end OUT 4; the total flow signal input terminal IN and the second flow signal input terminal IN2 are connected to the total flow signal output terminal OUT and the second flow signal output terminal OUT12, respectively. The cold water temperature signal input end IN3 is connected to the cold water temperature signal output end OUT3, and the gas valve driving signal output end OUT4 is connected to the gas valve driving signal input end IN 4.
the principle of the gas water heater for adjusting combustion power is as follows:
the mixing valve 301 or the first and second adjusting valves 303 and 304 are adjusted to change the outlet hot water flows of the first and second hot water outlets 203 and 204, and the inlet cold water flow of the cold water inlet 205 is the sum of the outlet hot water flows of the first and second hot water outlets 203 and 204. The opening degree of the gas valve is controlled according to the regulation sensitivity by the ratio of the outlet hot water flow of the second hot water outlet 204 to the inlet cold water flow of the cold water inlet 205; when the ratio of the outlet hot water flow of the second hot water outlet 204 to the inlet cold water flow of the cold water inlet 205 is increased, the opening degree of the control gas valve is reduced, the combustion power is reduced, and conversely, the combustion power is increased. The temperature of cold water at the inlet of the cold water inlet 205 controls and adjusts the sensitivity; when the inlet cold water temperature of the cold water inlet 205 decreases, the control and adjustment sensitivity increases; conversely, the control adjustment sensitivity decreases.
Q Q T KIf the outlet hot water flow rate of the second hot water outlet 204 is Q2, the inlet cold water flow rate of the cold water inlet 205 is Q0, and the inlet cold water temperature of the cold water inlet 205 is T1, the sensitivity K is adjusted according to the formula
T K KCalculating, wherein T0 is a compensation reference temperature value, the value range is 30-40, and the typical value is 35; k0 is a reference sensitivity coefficient, the value range is 0.4-1, and the typical value is 0.5; k1 is a sensitivity adjustment coefficient, and the value range is 0-0.03, and the typical value is 0.015.
POpening control value P of gas valve according to formula
PminAnd calculating, wherein Pmin is the minimum opening control value of the gas valve, and the value range is 0-0.5.
T T Q QThe inlet cold water temperature T1 and the compensation reference temperature value T0 are in units, and the flow rates Q0 and Q2 are in units of L/min.
the controller 210 is composed of a microcontroller and peripheral circuits. The microcontroller is preferably a single chip microcomputer or other devices such as ARM, DSP and the like are selected. When the signal type of the second flow signal and the total flow signal is a pulse frequency, the second flow signal input terminal IN2 and the total flow signal input terminal IN are counting input terminals of a counter inside the microcontroller.
When the cold water temperature signal output by the cold water temperature sensor 206 is a digital signal, the cold water temperature signal input terminal IN3 is a corresponding interface inside the microcontroller that matches the output interface of the cold water temperature sensor 206.
when part or all of the total flow signal, the second flow signal and the cold water temperature signal are analog signals, namely, voltage or current, the corresponding ports of the total flow signal input terminal IN, the second flow signal input terminal IN2 and the cold water temperature signal input terminal IN3 are analog signal input terminals of the a/D converter. The a/D converter is controlled by and reads data from the microcontroller, preferably included within the microcontroller.
P P P The gas flow control driving module 211 is composed of a gas proportional valve and a related driving circuit, and the driving signal of the gas valve is preferably PWM pulse. When the gas flow control driving module 211 controls the opening of the gas valve by the PWM pulse, the duty ratio of the PWM pulse is the opening control value P of the gas valve; when P = 1, the duty ratio of the PWM pulse is 100%; when P = 0.5, the duty ratio of the PWM pulse is 50%. The function of the Pmin is to avoid the control dead zone of the gas proportional valve; and secondly, the minimum flow of the gas is maintained, and the flameout of the gas water heater is avoided.
The gas water heater also comprises a fan control driving module, an ignition control and flame detection module and the like. Further, the gas water heater also selectively comprises a part of or all of the hot water temperature detection module, the temperature value display module, the wind pressure detection module and the buzzer module.
The gas water heater also includes a power module for providing power to the controller 210, the total flow sensor 201, the reaction flow sensor 202, the gas flow control drive module 211, and other modules.
The flow of calculating and adjusting the combustion power of the gas water heater by the controller 210 is shown in fig. 4, and the steps are as follows:
Step S1, initialization;
Q Q TStep S2, sampling an outlet hot water flow Q2 of the second hot water outlet 204 and an inlet cold water flow Q0 of the cold water inlet 205; sampling the inlet cold water temperature T1 of the cold water inlet 205;
Kstep S3, calculating and adjusting sensitivity K;
PStep S4, calculating an opening control value P of the gas valve;
PStep S5, changing the opening of the gas valve according to P, and controlling the combustion power of the gas water heater;
Step S6, other processing and waiting; when the next sampling timing arrives, the process proceeds to step S2.
The controller 210 performs other controls in addition to controlling the combustion power of the gas water heater. The other processing and waiting, including fan control driving, ignition control, etc., that the controller 210 needs to complete, and waiting.
The control of the next sampling time is realized by software delay or timer timing by the controller 210.
The reaction flow sensor 202 and the total flow sensor 201 are preferably water flow sensors of the same type and in the same range. Further, the reaction flow sensor 202 and the total flow sensor 201 are preferably low-cost hall water flow sensors with pulse frequency output signals.
the cold water temperature sensor 206 is preferably an integrated sensor with a digital signal output interface.
The above description is only an example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A combustion power adjusting method for a gas water heater is characterized by comprising the following steps:
the gas water heater comprises a controller, a counteractive flow sensor, a total flow sensor, a cold water temperature sensor, a gas flow control driving module, a first hot water outlet, a second hot water outlet and a cold water inlet;
The reaction flow sensor is arranged in front of the second hot water outlet and used for detecting the outlet hot water flow of the second hot water outlet; the total flow sensor is arranged behind the cold water inlet and used for detecting the inlet cold water flow of the cold water inlet; the cold water temperature sensor is arranged behind the cold water inlet and used for detecting the inlet cold water temperature of the cold water inlet;
The reaction flow sensor is electrically connected with the controller and is used for transmitting an outlet hot water flow signal of the second hot water outlet to the controller; the total flow sensor is electrically connected with the controller and is used for transmitting an inlet cold water flow signal of the cold water inlet to the controller; the cold water temperature sensor is electrically connected with the controller and is used for transmitting an inlet cold water temperature signal of the cold water inlet to the controller; the gas flow control driving module is electrically connected with the controller and is used for controlling and changing the opening of the gas valve by the controller through the gas flow control driving module;
The combustion power adjusting method is that the combustion power is controlled by the ratio of the outlet hot water flow of the second hot water outlet and the inlet cold water flow of the cold water inlet according to the adjusting sensitivity; when the ratio of the outlet hot water flow of the second hot water outlet to the inlet cold water flow of the cold water inlet is increased, controlling the combustion power to be reduced; otherwise, controlling the combustion power to increase; the temperature of cold water at the inlet of the cold water inlet controls and adjusts the sensitivity; when the temperature of the cold water at the inlet of the cold water inlet is reduced, the control and adjustment sensitivity is increased; conversely, the control and regulation sensitivity is reduced;
The combustion power is controlled by the opening degree of the gas valve.
2. The combustion power adjusting method of a gas water heater as claimed in claim 1, wherein: the ratio of the outlet hot water flow of the second hot water outlet to the inlet cold water flow of the cold water inlet is adjusted and changed by the water mixing valve; 2 water inlets of the water mixing valve are respectively connected to a first hot water outlet and a second hot water outlet of the gas water heater through water pipes.
3. The combustion power adjusting method of a gas water heater as claimed in claim 1, wherein: the ratio of the outlet hot water flow of the second hot water outlet to the inlet cold water flow of the cold water inlet is adjusted and changed by the first adjusting valve and the second adjusting valve; the water inlet of the first regulating valve is connected to a first hot water outlet of the gas water heater through a water pipe, and the water inlet of the second regulating valve is connected to a second hot water outlet of the gas water heater through a water pipe; the water outlets of the first regulating valve and the second regulating valve are communicated to form a water outlet end.
4. The combustion power adjusting method of a gas water heater as claimed in claim 1, wherein: the sensitivity of the adjustment is according to formula
K＝K0+K1·(T0-T1)
Performing a calculation, wherein K is the tuning sensitivity; t0 is a compensation reference temperature value, and the value range is 30-40 ℃; k0 is a reference sensitivity coefficient, and the value range is 0.4-1; k1 is a sensitivity adjustment coefficient, and the value range is 0-0.03.
5. the combustion power adjusting method of a gas water heater as claimed in claim 4, wherein: the opening degree of the gas valve is controlled by an opening degree control value of the gas valve; the opening control value of the gas valve is according to the formula
Calculating, wherein P is an opening control value of the gas valve; q2 is the outlet hot water flow of the second hot water outlet, Q0 is the inlet cold water flow of the cold water inlet; pmin is the minimum opening control value of the gas valve, and the value range is 0-0.5.
6. The combustion power adjusting method of a gas water heater as claimed in claim 5, wherein: the step of the controller calculating the temperature set point is:
step S1, initialization;
step S2, sampling the outlet hot water flow of the second hot water outlet and the inlet cold water flow of the cold water inlet; sampling the temperature of cold water at the inlet of the cold water inlet;
Step S3, calculating and adjusting sensitivity;
step S4, calculating an opening control value of the gas valve;
Step S5, changing the opening of the gas valve according to the opening control value of the gas valve, and controlling the combustion power of the gas water heater;
Step S6, other processing and waiting; when the next sampling timing arrives, the process proceeds to step S2.
7. The combustion power adjusting method of a gas water heater as claimed in claim 6, wherein: the other processing and waiting are other control and waiting of the gas water heater which are carried out by the controller besides the calculation of the temperature set value of the gas water heater.
8. The combustion power adjusting method of a gas water heater as claimed in claim 1, wherein: the reaction flow sensor and the total flow sensor are water flow sensors of the same type and the same measuring range.
9. The combustion power adjusting method of a gas water heater as claimed in claim 1, wherein: the gas water heater also comprises a heat exchanger, a water pipe, a power module, a fan control driving module and an ignition control and flame detection module.
10. the combustion power adjusting method of a gas water heater as claimed in claim 1, wherein: the fuel gas flow control driving module consists of a fuel gas proportional valve and a related driving circuit; the type of the driving signal of the gas flow control driving module is PWM pulse.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610000433.6A CN105509330B (en) | 2016-01-04 | 2016-01-04 | Combustion power adjusting method for gas water heater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610000433.6A CN105509330B (en) | 2016-01-04 | 2016-01-04 | Combustion power adjusting method for gas water heater |
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| CN105509330A CN105509330A (en) | 2016-04-20 |
| CN105509330B true CN105509330B (en) | 2019-12-06 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201688004U (en) * | 2010-05-18 | 2010-12-29 | 无锡和晶科技股份有限公司 | Proportional valve control and feedback circuit of gas water heater |
| CN103344046A (en) * | 2013-06-28 | 2013-10-09 | 海尔集团公司 | Constant-temperature gas water heater control method and constant-temperature gas water heater |
| CN104236109A (en) * | 2013-06-24 | 2014-12-24 | 海尔集团公司 | Control method and control device of constant-temperature gas water heater |
-
2016
- 2016-01-04 CN CN201610000433.6A patent/CN105509330B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201688004U (en) * | 2010-05-18 | 2010-12-29 | 无锡和晶科技股份有限公司 | Proportional valve control and feedback circuit of gas water heater |
| CN104236109A (en) * | 2013-06-24 | 2014-12-24 | 海尔集团公司 | Control method and control device of constant-temperature gas water heater |
| CN103344046A (en) * | 2013-06-28 | 2013-10-09 | 海尔集团公司 | Constant-temperature gas water heater control method and constant-temperature gas water heater |
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Inventor after: Luo Jiepei Inventor after: Ling Yun Inventor after: Xiao Shenping Inventor after: Zeng Hongbing Inventor after: Chen Gang Inventor after: Peng Gao Inventor after: Nie Hui Inventor before: Ling Yun Inventor before: Xiao Shenping Inventor before: Zeng Hongbing Inventor before: Chen Gang Inventor before: Peng Gao Inventor before: Nie Hui |
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Effective date of registration: 20201015 Address after: 237000 Democratic constituency of Shiji street, Anfeng Town, Shouxian County, Huainan City, Anhui Province Patentee after: Wang Jingjing Address before: 412007 School of industry, research and production, Hunan University of Technology, 88 West Taishan Road, Zhuzhou, Hunan Patentee before: HUNAN University OF TECHNOLOGY Effective date of registration: 20201015 Address after: No.76 Minfeng South Road, Nanfeng Town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee after: ZHANGJIAGANG DONGDA INDUSTRIAL TECHNOLOGY Research Institute Address before: 237000 Democratic constituency of Shiji street, Anfeng Town, Shouxian County, Huainan City, Anhui Province Patentee before: Wang Jingjing |
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