CN108826700B - Control method and device for safety protection of gas water heater and gas water heater - Google Patents
Control method and device for safety protection of gas water heater and gas water heater Download PDFInfo
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- CN108826700B CN108826700B CN201810614025.9A CN201810614025A CN108826700B CN 108826700 B CN108826700 B CN 108826700B CN 201810614025 A CN201810614025 A CN 201810614025A CN 108826700 B CN108826700 B CN 108826700B
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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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Abstract
The embodiment of the invention provides a control method and a control device for safety protection of a gas water heater and the gas water heater, and belongs to the field of electric appliances. The control method comprises the following steps: after the gas water heater is in a shutdown state due to a flue blockage fault, when the water flow sensor detects a water flow signal, controlling the gas water heater to restart, and after the gas water heater is restarted, executing the following steps to determine whether to start the igniter or not: detecting the blockage degree of the flue; when the degree of the flue blockage is detected to be in a normal range, opening the gas valve and starting the igniter; and when the blockage degree of the flue is detected to be beyond a normal range, closing the gas valve and not starting the igniter. According to the technical scheme, the safety of equipment and users can be effectively protected, and the detonation condition is avoided.
Description
Technical Field
The invention relates to the field of electric appliances, in particular to a control method and device for safety protection of a gas water heater and the gas water heater.
Background
During the use process of the gas water heater, the problem of unsmooth smoke discharge may occur. For example, users near seasides or at high residential levels are often affected by inclement weather (e.g., high winds) that can cause gas water heaters to smoke poorly. In addition, the problem of unsmooth smoke discharge can also be caused by the accidental blockage of the flue of the gas water heater. For a gas water heater, if smoke exhaust is not smooth, the problems of deterioration of gas combustion working conditions, increase of CO emission and burning out of main parts such as a heat exchanger are easily caused, and personal safety is affected in severe cases, so that the blockage condition of a flue must be effectively monitored, and timely safety protection measures must be taken.
At present, many gas water heater products can carry out system inspection only when being started for the first time, and after the gas water heater is ignited and combusted, an air valve of the gas water heater can be closed and flamed out after a flue blockage fault is detected, so that the gas water heater is in a shutdown state. However, when the water heater is in a shutdown state due to a flue blockage fault, and a user restarts the water heater, the gas valve of the gas water heater is directly opened and ignited, and whether the flue blockage fault is eliminated or not is not detected in advance, so that the deflagration is easy to occur under the condition that the fault is not eliminated, and potential safety hazards exist for the user.
Disclosure of Invention
In order to at least partially solve the above problems in the prior art, an object of an embodiment of the present invention is to provide a control method and a control device for safety protection of a gas water heater, and a gas water heater.
In order to achieve the above object, an embodiment of the present invention provides a control method for safety protection of a gas water heater, where the gas water heater includes a flue, a fan, a gas valve, an igniter, and a water flow sensor, the control method includes: after the gas water heater is in a shutdown state due to a flue blockage fault, when the water flow sensor detects a water flow signal, controlling the gas water heater to restart, and after the gas water heater is restarted, executing the following steps to determine whether to start the igniter or not: detecting the blockage degree of the flue; when the degree of the flue blockage is detected to be in a normal range, opening the gas valve and starting the igniter; and when the blockage degree of the flue is detected to be beyond a normal range, closing the gas valve and not starting the igniter.
Optionally, the control method further includes: and detecting the blockage degree of the flue by detecting the current and/or the rotating speed of the fan.
Optionally, the control method further includes: and detecting the blockage degree of the flue by detecting the air pressure in the flue.
Optionally, the control method further includes: after the gas water heater is ignited and combusted, continuously detecting the blockage degree of the flue, and judging whether the blockage degree reaches the closing condition of the gas valve or not when the blockage degree of the flue is detected to exceed the normal range; when the blockage degree does not reach the closing condition, controlling the fan to increase wind power; and when the degree of blockage reaches the closing condition, closing an air valve and displaying a fault code indicating that the flue is blocked.
Optionally, the control method further includes: when the degree of the flue blockage is detected to be beyond a normal range, displaying a fault code indicating the flue blockage.
Optionally, the control method further includes: after displaying the fault code, the water flow sensor continuously detects the water flow signal; continuously displaying the fault code when the water flow signal is present; and eliminating the fault code when the water flow signal is not present.
In another aspect, an embodiment of the present invention further provides a control device for safety protection of a gas water heater, where the gas water heater includes a flue, a fan, a gas valve, an igniter, and a water flow sensor, where the control device includes: the restarting control module is used for controlling the gas water heater to restart when the water flow sensor detects a water flow signal after the gas water heater is in a shutdown state due to a flue blockage fault, and controlling the following modules to work to determine whether to start the igniter after the gas water heater is restarted: the detection module is used for detecting the blockage degree of the flue; and the ignition control module is used for opening the gas valve and starting the igniter when the detection module detects that the blockage degree of the flue is in a normal range, and is used for closing the gas valve and not starting the igniter when the detection module detects that the blockage degree of the flue is beyond the normal range.
Optionally, the detection module detects the blockage degree of the flue by detecting the current and/or the rotating speed of the fan.
Optionally, the detection module detects a blockage degree of the flue by detecting air pressure in the flue.
Optionally, the detection module is further configured to: after the gas water heater is ignited and combusted, continuously detecting the blockage degree of the flue; the restart control module is further configured to: when the detection module detects that the blockage degree of the flue exceeds the normal range after the gas water heater ignites and burns, judging whether the blockage degree reaches the closing condition of the gas valve; when the blockage degree does not reach the closing condition, controlling the fan to increase wind power; and when the blockage degree reaches the closing condition, closing the gas valve through the ignition control module and displaying a fault code indicating that the flue is blocked through a pre-configured display module.
Optionally, the gas water heater further comprises a display module, and the restart control module is further configured to: and when the detection module detects that the blockage degree of the flue exceeds a normal range, displaying a fault code indicating the blockage of the flue through the display module.
Optionally, the restart control module is further configured to: after the display module displays the fault code, continuously detecting the water flow signal through the water flow sensor; when the water flow signal exists, controlling the display module to continuously display the fault code; and controlling the display module to eliminate the fault code when the water flow signal is not present.
On the other hand, the embodiment of the invention also provides a gas water heater, which comprises the control device.
In the technical scheme of the invention, when the gas water heater is restarted after a flue blockage fault occurs, the blockage degree of the flue is checked firstly, so that the gas water heater can respond to the water flow signal to carry out ignition combustion only when the blockage degree of the flue is within a normal range, thereby effectively protecting the safety of equipment and users.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a flow chart of a control method for safety protection of a gas water heater according to an embodiment of the invention;
FIG. 2 is a flow chart of a control method for gas water heater safety protection according to an alternative embodiment of the present invention; and
fig. 3 is a block diagram of a control device for a gas water heater according to an embodiment of the present invention.
Description of the reference numerals
10 restart control module 20 detection module
30 ignition control module
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a flowchart of a control method for safety protection of a gas water heater according to an embodiment of the present invention. As shown in fig. 1, an alternative embodiment of the present invention provides a control method for safety protection of a gas water heater including a flue, a fan, a gas valve, an igniter, and a water flow sensor, the control method including: after the gas water heater is in a shutdown state due to a flue blockage fault, when the water flow sensor detects a water flow signal, the gas water heater is controlled to be restarted, and the following steps are executed after the gas water heater is restarted to determine whether the igniter is started or not.
Step S101, detecting whether the blockage degree of the flue is in a normal range, executing step S102 when detecting that the blockage degree of the flue is in the normal range, and executing step S103 when detecting that the blockage degree of the flue is beyond the normal range.
Step S102, the gas valve is opened, and the igniter is started.
Step S103, keeping the gas valve closed, and not starting the igniter.
The flue is a smoke exhaust device of the gas water heater, and smoke generated after ignition of gas by the gas water heater is exhausted through the flue. The fan is used for accelerating the discharge of the flue gas by generating gas pressure. The gas valve is used for controlling the on-off of the gas. The igniter can ignite the gas by generating sufficient energy. The water flow sensor is installed in the pipeline of the gas water heater, and when a user uses water, a water flow signal can be detected through the water flow sensor. Here, the flue, the fan, the gas valve, the igniter and the water flow sensor are all conventional components of the gas water heater, and the structure and the connection relationship among the components are not described in more detail.
Optionally, the gas water heater may further include a display module, and when it is detected that the degree of the flue blockage exceeds the normal range, the gas water heater may further display a fault code indicating the flue blockage through the display module to remind the user.
In the technical scheme of the invention, when the gas water heater is restarted after a flue blockage fault occurs, the blockage degree of the flue is checked firstly, so that the gas water heater can respond to the water flow signal to carry out ignition combustion only when the blockage degree of the flue is within a normal range, thereby effectively protecting the safety of equipment and users.
Fig. 2 is a flow chart of a control method for safety protection of a gas water heater according to an alternative embodiment of the invention. In an alternative embodiment of the present invention, as shown in fig. 2, the gas water heater is turned on and off depending on whether the user uses water. Specifically, when a user uses water, the water flow sensor detects that a water flow signal exists in the pipeline, and the gas water heater is powered on in response to the water flow signal; and when the water flow sensor detects that the water flow signal disappears, the gas valve of the gas water heater is closed to extinguish and shut down. The gas water heater comprises two startup states, wherein one startup state is normal startup, and the other startup state is restart after a flue blockage fault.
The water heater is normally started, namely, the blockage fault of the flue is not detected before the water is used by a user. At the moment, when the user uses water, the gas water heater is normally started. And after the gas water heater is normally started, the system is firstly patrolled. The system is mainly used for detecting the condition of internal lines of the gas water heater and the blockage degree of a flue. In the system inspection process, if a fault is found (for example, a short circuit or an open circuit of a line occurs or the blockage degree of a flue exceeds a normal range), a user is prompted to have the fault through alarming, and a corresponding fault code can be displayed through a display module of the gas water heater; if in the process of patrolling and examining, the trouble is not found, then open gas heater's pneumatic valve and start the igniter to make gas heater ignition burning, guarantee that the user uses hot water smoothly. When the gas water heater is in a combustion state to heat water, the blockage degree of the flue can be continuously detected, when the gas water heater detects that the blockage degree of the flue is within the normal range (namely the smoke exhaust system is normal), combustion can be maintained until a user shuts down (namely the user stops using water) or the combustion time reaches the time preset by the user, the gas valve is closed and flameout is carried out, and when the gas water heater detects that the blockage degree of the flue is beyond the normal range (namely the smoke exhaust system is in fault), whether the blockage degree reaches the closing condition of the gas valve or not can be judged. When the blockage degree does not reach the closing condition of the air valve, the gas water heater can improve the blockage of the flue by controlling the fan to increase wind power, and maintain combustion until a user shuts down (namely the user stops using water) or the combustion time reaches the time preset by the user, the air valve is closed and flameout; when the blocking degree reaches the closing condition of the gas valve, the gas water heater closes the gas valve, extinguishes and displays a fault code indicating that the flue is blocked, and meanwhile, the user is reminded in an alarming mode.
It should be noted that the normal range and the shutdown condition can be reasonably determined according to the actual situation of the gas water heater. Specifically, when the blockage degree of the flue is in a normal range, the flue gas after combustion can be discharged through the flue normally, and when the blockage degree of the flue exceeds the normal range and does not reach a closing condition, the flue gas can be discharged through the flue smoothly by increasing wind power, and when the blockage degree of the flue reaches the closing condition, the flue blockage is serious, and the air valve needs to be closed to stop the generation of the flue gas.
In addition, after the gas water heater displays the fault code, a water flow signal can be continuously detected through the water flow sensor, and when the water flow signal exists, the gas water heater continuously displays the fault code until the water flow signal disappears so as to remind a user; when no water flow signal exists, the fault code is eliminated, and the gas water heater does not display the fault code any more.
In the case of restarting the gas water heater after the flue blockage failure (that is, in the system inspection process or the ignition combustion process, the gas water heater is restarted after being in a shutdown state due to the detection of the flue blockage failure), because the reason for the flue blockage is uncertain (either blockage caused by the existence of foreign matters in the flue or blockage caused by strong wind is possible), when restarting, the degree of the flue blockage is uncertain (either eliminated or still blocked). Therefore, in the present embodiment, when the user uses water again (i.e., restarts) after the flue blockage failure, the system inspection is performed first, and the system inspection mainly inspects the degree of the flue blockage. In the system inspection process, if the flue blockage degree is found to exceed the normal range, a user is prompted to have a flue blockage fault through alarming, a fault code is displayed, meanwhile, the gas valve is kept closed, and an igniter is not started; if in the process of patrolling and examining, the trouble is not found, then open gas heater's pneumatic valve and start the igniter to make gas heater ignition burning, guarantee that the user uses hot water smoothly. The process after ignition of the fuel gas is the same as that in the normal start-up, and is not described herein again.
In an optional embodiment of the invention, the blockage degree of the flue can be detected by detecting one of the current and the rotating speed of the fan of the gas water heater, and the blockage degree of the flue can also be detected by detecting both the current and the rotating speed. Specifically, the relationship between the flue blockage degree and the current and the rotating speed of the fan can be determined according to the resistance characteristic of the fan. Generally, as the degree of flue blockage increases (i.e., as the blockage becomes more severe), the fan current decreases and the speed increases. Therefore, the blockage degree of the flue can be judged by detecting the current and/or the rotating speed of the fan. And whether the blockage degree of the flue exceeds a normal range and/or reaches a closing condition can be judged by setting the threshold values of the current and the rotating speed and according to whether the current and the rotating speed of the fan exceed the corresponding threshold values. And when the wind power of the fan needs to be increased, the wind power of the fan can be controlled to be increased by increasing the current of the fan.
In another alternative embodiment of the invention, the blockage degree of the flue can also be detected by detecting the air pressure in the flue of the gas water heater. Specifically, when the flue of the gas water heater is blocked, the pressure in the flue can be different from the external pressure, so that a wind pressure switch can be arranged in the flue of the gas water heater, and the pressure in the flue can be compared with the external pressure through the wind pressure switch. Through the reasonable setting of the start point and the shutdown point of the wind pressure switch, the gas water heater can detect whether the degree of the flue blockage exceeds the normal range and/or reaches the closing condition through the wind pressure switch.
The gas water heater can be a direct-current forced-ventilated type gas water heater or an alternating-current forced-ventilated type gas water heater. For the direct-current forced-ventilated type gas water heater, the blockage degree of the flue is preferably detected by adopting the mode of detecting the current and the rotating speed of the fan. For the alternating current forced-ventilated type gas water heater, the mode of the pressure switch is preferably adopted to detect the blockage degree of the flue.
Fig. 3 is a block diagram of a control device for a gas water heater according to an embodiment of the present invention. As shown in fig. 3, the embodiment of the present invention further provides a control device for a gas water heater, which includes a flue, a fan, a gas valve, an igniter, and a water flow sensor. Wherein, this controlling means can include: the restart control module 10 is configured to, after the gas water heater is in a shutdown state due to a flue blockage fault, control the gas water heater to restart when the water flow sensor detects a water flow signal, and control the following modules to operate to determine whether to start the igniter after the gas water heater is restarted: the detection module 20 is used for detecting the blockage degree of the flue; the ignition control module 30 is used for opening the gas valve and starting the igniter when the detection module 20 detects that the flue blockage degree is in a normal range; and when the detection module 20 detects that the flue blockage degree exceeds a normal range, the gas valve is closed, and the igniter is not started.
In an alternative embodiment of the present invention, the detection module 20 may be, for example, a current sensor and/or a rotational speed sensor for detecting the current and/or the rotational speed of the fan. The detection module 20 may detect the blockage degree of the flue by detecting the current and/or the rotation speed of the fan.
In an alternative embodiment of the present invention, the detecting module 20 may be, for example, a wind pressure switch, and is used for detecting the air pressure inside and outside the flue. The detection module 20 can detect the blockage degree of the flue by detecting the air pressure in the flue.
In an alternative embodiment of the present invention, the detection module 20 is further configured to: and after the gas water heater is ignited and combusted, continuously detecting the blockage degree of the flue. And the restart control module 10 is also configured to: when the detection module 20 detects that the blockage degree of the flue exceeds the normal range after the gas water heater ignites and burns, judging whether the blockage degree of the flue reaches the closing condition of the gas valve; when the blockage degree does not reach the closing condition of the air valve, controlling the fan to increase wind power; when the clogging degree reaches the closing condition of the gas valve, the gas valve is closed by the ignition control module 30 and a fault code indicating the clogging of the flue is displayed by a pre-configured display module.
In an optional embodiment of the present invention, the gas water heater further comprises a display module, such as a display screen. The restart control module 10 is further configured to: when the detection module 20 detects that the flue blockage degree exceeds the normal range, a fault code indicating the flue blockage is displayed through the display screen.
In an optional embodiment of the present invention, the restart control module 10 is further configured to: after the display module displays the fault code, continuously detecting a water flow signal through a water flow sensor; when the water flow signal exists, controlling the display module to continuously display the fault code until the water flow signal disappears; and when no water flow signal exists, controlling the display module to eliminate the fault code.
In addition, the embodiment of the invention also provides a gas water heater, which comprises the control device for the safety protection of the gas water heater.
In the technical scheme of the invention, when the gas water heater is restarted after a flue blockage fault occurs, the blockage degree of the flue is checked firstly, so that the gas water heater can respond to the water flow signal to carry out ignition combustion only when the blockage degree of the flue is within a normal range, thereby effectively protecting the safety of equipment and users and avoiding the occurrence of deflagration.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
Those skilled in the art will understand that all or part of the steps in the method according to the above embodiments may be implemented by a program, which is stored in a storage medium and includes instructions for causing a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (9)
1. A control method for safety protection of a gas water heater is characterized in that the gas water heater comprises a flue, a fan, an air valve, an igniter and a water flow sensor, the gas water heater is a direct-current forced-ventilated type gas water heater or an alternating-current forced-ventilated type gas water heater, and the control method comprises the following steps:
after the gas water heater is in a shutdown state due to a flue blockage fault, when the water flow sensor detects a water flow signal, controlling the gas water heater to restart, and after the gas water heater is restarted, executing the following steps to determine whether to start the igniter or not:
after the gas water heater is ignited and combusted, continuously detecting the blockage degree of the flue by detecting the air pressure in the flue;
when the blockage degree of the flue is detected to be within a normal range, opening the gas valve, starting the igniter, keeping the gas water heater burning until a user shuts down or the burning time of the gas water heater reaches the time preset by the user, closing the gas valve and closing the igniter; and
when the blockage degree of the flue is detected to exceed the normal range, judging whether the blockage degree reaches the closing condition of the air valve;
when the blockage degree does not reach the closing condition, controlling the fan to increase wind power;
when the degree of blockage reaches the shut-off condition, a gas valve is closed and the igniter is not activated and a fault code indicating that the flue is blocked is displayed.
2. The control method according to claim 1, characterized by further comprising: and detecting the blockage degree of the flue by detecting the current and/or the rotating speed of the fan.
3. The control method according to claim 1, characterized by further comprising: when the degree of the flue blockage is detected to be beyond a normal range, displaying a fault code indicating the flue blockage.
4. The control method according to claim 1 or 3, characterized by further comprising:
after displaying the fault code, the water flow sensor continuously detects the water flow signal;
continuously displaying the fault code when the water flow signal is present; and
eliminating the fault code when the water flow signal is not present.
5. The utility model provides a controlling means for gas heater safety protection, its characterized in that, gas heater includes flue, fan, pneumatic valve, some firearm and rivers sensor, gas heater is direct current forced-ventilated formula gas heater or exchanges forced-ventilated formula gas heater, wherein, controlling means includes:
the restarting control module is used for controlling the gas water heater to restart when the water flow sensor detects a water flow signal after the gas water heater is in a shutdown state due to a flue blockage fault, and controlling the following modules to work to determine whether to start the igniter after the gas water heater is restarted:
the detection module is used for continuously detecting the blockage degree of the flue by detecting the air pressure in the flue after the gas water heater is ignited and combusted;
the ignition control module is used for opening the gas valve and starting the igniter when the detection module detects that the flue blockage degree is within a normal range, closing the gas valve and closing the igniter when the gas water heater keeps burning until a user shuts down or the burning time of the gas water heater reaches a time preset by the user, and closing the gas valve and not starting the igniter when the detection module detects that the flue blockage degree is beyond the normal range;
the restart control module is further configured to: when the detection module detects that the blockage degree of the flue exceeds the normal range after the gas water heater ignites and burns, judging whether the blockage degree reaches the closing condition of the gas valve; when the blockage degree does not reach the closing condition, controlling the fan to increase wind power; and when the blockage degree reaches the closing condition, closing the gas valve through the ignition control module and displaying a fault code indicating that the flue is blocked through a pre-configured display module.
6. The control device of claim 5, wherein the detection module detects the blockage degree of the flue by detecting the current and/or the rotating speed of the fan.
7. The control device of claim 5, wherein the gas water heater further comprises a display module, and the restart control module is further configured to: and when the detection module detects that the blockage degree of the flue exceeds a normal range, displaying a fault code indicating the blockage of the flue through the display module.
8. The control apparatus of claim 5 or 7, wherein the restart control module is further configured to:
after the display module displays the fault code, continuously detecting the water flow signal through the water flow sensor;
when the water flow signal exists, controlling the display module to continuously display the fault code; and
and when the water flow signal does not exist, controlling the display module to eliminate the fault code.
9. Gas water heater characterized in that it comprises a control device according to any one of claims 5 to 8.
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| CN201810614025.9A CN108826700B (en) | 2018-06-14 | 2018-06-14 | Control method and device for safety protection of gas water heater and gas water heater |
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| CN201810614025.9A CN108826700B (en) | 2018-06-14 | 2018-06-14 | Control method and device for safety protection of gas water heater and gas water heater |
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| CN111426070B (en) * | 2020-05-21 | 2021-04-23 | 珠海格力电器股份有限公司 | Wall-mounted furnace smoke tube detection method and device and wall-mounted furnace |
| CN112460814B (en) * | 2020-11-10 | 2022-02-11 | 华帝股份有限公司 | Control method for wind speed self-adaption of direct-current variable-frequency gas water heater |
| CN112361613A (en) * | 2020-11-12 | 2021-02-12 | 珠海格力电器股份有限公司 | Gas water heater, control method and device of gas water heater and storage medium |
| CN112747476B (en) * | 2020-12-30 | 2022-04-08 | 广东万和新电气股份有限公司 | Control method and control system of water heater and water heater |
| CN114017925B (en) * | 2021-10-19 | 2023-04-11 | 广东万和新电气股份有限公司 | Gas water heater and reignition method and control device thereof |
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Effective date of registration: 20230410 Address after: 241000 west side of 3 / F, No.5 office building, new energy and new materials gathering area, Fuzhou Road, Jiangbei District, Wuhu City, Anhui Province Patentee after: Wuhu Midea intelligent kitchen electricity Manufacturing Co.,Ltd. Address before: 241000 Wanchun East Road, East District, Wuhu Economic and Technological Development Zone, Anhui Province Patentee before: WUHU MIDEA KITCHEN AND BATH APPLIANCES MFG. Co.,Ltd. |