CN105299715A - Range hood and control method thereof - Google Patents
Range hood and control method thereof Download PDFInfo
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- CN105299715A CN105299715A CN201410306416.6A CN201410306416A CN105299715A CN 105299715 A CN105299715 A CN 105299715A CN 201410306416 A CN201410306416 A CN 201410306416A CN 105299715 A CN105299715 A CN 105299715A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000006233 lamp black Substances 0.000 claims abstract description 53
- 230000008859 change Effects 0.000 claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 239000000779 smoke Substances 0.000 claims description 91
- 239000006096 absorbing agent Substances 0.000 claims description 46
- 230000003993 interaction Effects 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 230000001276 controlling effect Effects 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 235000019504 cigarettes Nutrition 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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Abstract
The invention relates to a range hood and a control method thereof. The range hood comprises a range hood body. A control device, a draught fan and a lampblack detection device are arranged in the range hood body. The lampblack detection device comprises an infrared emitter and two infrared receivers. One infrared receiver and the infrared emitter are oppositely arranged on the two sides of an air inlet of the range hood body and used for acquiring infrared rays penetrating through lampblack. The other infrared receiver and the infrared emitter are installed on the same side and used for acquiring infrared rays which are blocked and reflected by lampblack. The infrared emitter and the infrared receivers are connected with the control device. The control device controls the rotating speed of the draught fan according to an infrared detection signal. According to the range hood and the control method thereof, the concentration of lampblack is determined through a difference comparison method, and then the rotating speed of the draught fan is controlled; the change of lampblack is independent of the change of ambient light and the like, existing interference factors are eliminated to the maximum extent, and the lampblack concentration detection precision is improved.
Description
Technical field
The present invention relates to a kind of lampblack absorber, particularly, relate to a kind of lampblack absorber and the control method thereof with oil smoke measuring ability, belong to lampblack absorber technical field.
Background technology
The startup of current exhauster for removing kitchen fumes all manually or gas combustion range ignition start, and stop be all manually or kitchen range close after time delay a period of time close.For manual start and stop and mode of speed regulation, often there is the situation forgotten unlatching, close, time especially the time is more nervous, or be stained with oil on hand, occur that operation is ineffective or got by oil on cigarette machine guidance panel.And kitchen range are controlled to the mode of start and stop, after its lampblack absorber shuts down and closes fire by kitchen range, time delay a period of time realizes, and does not have direct relation with or without oil smoke is residual, may occur that oil smoke remains cigarette machine already and but also turning, or oil smoke also has residual, and cigarette machine has but stopped.
In order to improve the problems referred to above; current part lampblack absorber has the function that wind-force regulates automatically; in lampblack absorber body, controller is set; and infrared transmitting device and infrared receiver are set at fume exhauster air inlet place; infrared transmitting device and infrared receiver respectively arrange one; be located at the both sides of air inlet in opposite directions; oil smoke passes between infrared transmitting device and infrared receiver; infrared transmitting device is connected with controller with infrared receiver, and controller controls start and stop or the rotating speed of blower fan according to infra-red intensity signal.But this mode, because the infrared ray through oil smoke can only be received, so be easily subject to the interference of the extraneous light such as the light that light in natural sunshine, kitchen, lampblack absorber are installed, and reduce the sensitivity that oil smoke concentration detects, occur the phenomenons such as blower fan misoperation.
Summary of the invention
Main purpose of the present invention is to solve the problem and deficiency, provides one can significantly promote oil smoke detection sensitivity, makes the more accurate lampblack absorber of control and control method thereof.
For achieving the above object, technical scheme of the present invention is:
A kind of lampblack absorber, comprise lampblack absorber body, control device is provided with in described lampblack absorber body, blower fan and oil smoke checkout gear, described oil smoke checkout gear comprises a RF transmitter and two infrared receivers, one of them infrared receiver and RF transmitter are arranged on the both sides of described lampblack absorber body air inlet in opposite directions for gathering the infrared ray through oil smoke, another infrared receiver and RF transmitter are arranged on the same side for gathering by the infrared ray of oil smoke blocking reflected, described RF transmitter is connected with described control device with infrared receiver, described control device is according to the rotating speed controlling described blower fan through the infrared detection signal with reflection.
Further, described control device comprises data processing unit and control unit, described data processing unit is connected with two described infrared receivers and is used for calculating to the infrared ray through oil smoke collected with by the ultrared change difference reflected, and result and standard deviation are compared, draw corresponding rotation speed of fan value and export to described control unit, controlling rotation speed of fan by described control unit.
Further, described mathematic interpolation is calculate without oil smoke state with have under oil smoke state through the ultrared change difference of oil smoke with by the ultrared change difference reflected respectively, the summation of getting two differences again draws total difference, utilizes total difference and standard deviation to compare.
Further, the RF transmitter and the infrared receiver that are arranged on homonymy are fixedly mounted on a pcb board.
Further, described lampblack absorber body is also provided with human-computer interaction interface, and described human-computer interaction interface is connected with described control device.
Another technical scheme of the present invention is:
A kind of control method of lampblack absorber, the RF transmitter being arranged at air inlet side continues to launch infrared signal, be arranged at the infrared signal of infrared receiver collection through oil smoke of air inlet opposite side, another infrared receiver being positioned at homonymy with RF transmitter gathers by the infrared signal of oil smoke blocking reflected, and two infrared receivers continue to send to control device the infrared signal collected; Control device calculates to the infrared ray through oil smoke received with by the ultrared change difference reflected, and judges oil smoke concentration according to the result of mathematic interpolation; The actual difference calculated and the standard deviation prestored compare by control device, draw the rotation speed of fan value of needs; Control device controls blower fan start-stop and running speed according to the above-mentioned rotation speed of fan value drawn.
Further, described mathematic interpolation is calculate without oil smoke state with have under oil smoke state through the ultrared change difference of oil smoke with by the ultrared change difference reflected respectively, the summation of getting two differences again draws total difference, utilizes total difference and standard deviation to compare.
Further, when the total difference calculated is greater than 0, judges there is oil smoke, namely start blower fan; When the total difference calculated equals 0, judge to have removed totally without oil smoke or oil smoke, namely close blower fan.
Further, described standard deviation is divided into multiple interval range, is respectively 0,0-A
1, A
1-A
2... A
n-1-A
n, the different gears of corresponding rotation speed of fan, be respectively shut down shelves, 1 grade, 2 grades ..., N shelves.
Further, described control device Continuous plus difference, actual difference continuously and standard deviation compare, or actual difference and standard deviation carried out calculating more once every a fixed cycle by described control device.
To sum up content, a kind of lampblack absorber of the present invention and control method thereof, lampblack absorber arranges two infrared receivers, not only receive the infra-red intensity transmitted through oil smoke, same detection is by the infra-red intensity of oil smoke blocking reflected, and by the concentration of difference comparsion method determination oil smoke and then the rotating speed of control blower fan, oil smoke has unchanged irrelevant with ambient light change etc., the existence eliminating disturbing factor of maximum possible, improve the detection sensitivity of oil smoke concentration, also the duty of lampblack absorber is more accurately controlled, avoid misoperation, can not exist and take out situation that is unclean or lampblack absorber idle running, realize energy-conserving and environment-protective.
Accompanying drawing explanation
Fig. 1 is range hood structure schematic diagram of the present invention;
Fig. 2 is Cleaning Principle figure of the present invention;
Fig. 3 is lampblack absorber control system block diagram of the present invention;
Fig. 4 is workflow diagram of the present invention.
As shown in Figures 1 to 4, lampblack absorber body 1, control device 2, blower fan 3, smoke duct 4, air inlet 5, RF transmitter 6, the first infrared receiver 7, second infrared receiver 8, pcb board 9, pcb board 10, human-computer interaction interface 11, data processing unit 12, control unit 13.
Detailed description of the invention
Below in conjunction with accompanying drawing and detailed description of the invention, the present invention is described in further detail:
As shown in Figure 1, a kind of lampblack absorber provided by the invention, comprise lampblack absorber body 1, control device 2, blower fan 3 and smoke duct 4 is provided with in lampblack absorber body 1, control device 2 is for being connected with the start and stop controlling blower fan 3 and rotating speed with the control module of blower fan 3, and blower fan 3 is arranged in smoke duct 4.When user cooks, oil smoke and water vapour can enter in lampblack absorber body 1 through air inlet 5, and discharge along smoke duct 4 under the effect of blower fan 3.
As depicted in figs. 1 and 2, lampblack absorber also comprises for detecting oil smoke checkout gear with presence or absence of oil smoke and water vapour, in the present embodiment, oil smoke checkout gear comprises a powerful RF transmitter 6 and two infrared receivers, be respectively the first infrared receiver 7 and the second infrared receiver 8, wherein the first infrared receiver 7 and RF transmitter 6 are arranged on the center of lampblack absorber body 1 air inlet 5 both sides in opposite directions, second infrared receiver 8 is arranged on the same side with RF transmitter 6, RF transmitter 6 and the second infrared receiver 8 are fixedly mounted on a pcb board 9, first infrared receiver 7 is fixedly mounted on another pcb board 10, pcb board 9 inside that is fixed on lampblack absorber body 1 relative to pcb board 10, RF transmitter 6, the probe of the first infrared receiver 7 and the second infrared receiver 8 stretches out the housing of lampblack absorber body 1.RF transmitter 6, first infrared receiver 7 is connected with control device 2 with the second infrared receiver 8, and control device 2 is connected with the control module of blower fan 3.
As shown in Figure 2, because the existence of oil smoke and water vapour, the light wave of the special spectrum scope of launching from RF transmitter 6 is through oil smoke, the energy of this wave band is absorbed, received by the other end first infrared receiver 7 after scattering, is reflected back part energy simultaneously and is received by second infrared receiver 8 of same one end.
In the present embodiment, because the particularity of kitchen environment, a cloche (not shown) is all fixed outside the probe of RF transmitter 6, first infrared receiver 7 and the second infrared receiver 8, user regularly can wipe examination cleaning cloche, ensures the sensitivity of signal transmitting and receiving.
Lampblack absorber body 1 is also provided with human-computer interaction interface 11, human-computer interaction interface 11 is connected with control device 2, user can carry out required operation on human-computer interaction interface 11, the duty of lampblack absorber can be shown, the information such as the detected value about oil smoke concentration of all right display control unit 2 simultaneously.
As shown in Figure 3, control device 2 comprises data processing unit 12 and control unit 13, the spectrum that energy variation occurs is converted to the signal of telecommunication by optical-electrical converter by data processing unit 12, by driving chip, completes two sampling, analog-to-digital conversion, gain enlarging function; Control using FPGA as acquisition system and process core, realize filtering while completing collection, Gamma corrects Preprocessing Algorithm.Particularly, data processing unit 12 is connected with the first infrared receiver 7 and the second infrared receiver 8, data processing unit 12 receives the infrared signal of the first infrared receiver 7 and the collection of the second infrared receiver 8, and two infrared signals are carried out mathematic interpolation, the corresponding relation of standard deviation and rotation speed of fan is also previously stored with in data processing unit 12, the actual difference calculated and the standard deviation prestored are compared, draw corresponding rotation speed of fan value, and result is exported to control unit 13, control unit 13 is connected with the control module of blower fan 3, controlled the rotating speed of blower fan 3 according to the rotation speed of fan value received by control unit 13, during oil smoke concentration height, blower fan 3 rotating speed is large, oil smoke concentration hour, the rotating speed of blower fan 3 is low.
Control unit 13 is identical with the control module communication pattern of existing range hood fan on the market, and connecter type is consistent, consistent with the communication protocol mode of power panel; Data after data processing unit 12 processes directly are transferred to the control module of blower fan to reach the object controlling fan speed by control unit 13, meanwhile, whole system is powered by control unit, provides 5V direct current by lampblack absorber power panel linkage interface.
Mathematic interpolation is calculate without oil smoke state with have through the infrared ray change difference of oil smoke with by the infrared ray change difference reflected under oil smoke state respectively, then the summation of getting two differences draws total difference, judges the concentration of oil smoke according to the change of total difference.
Concrete mathematic interpolation method is:
During without oil smoke, the infrared signal detected value setting the first infrared receiver 7 reception is T0, the detected value setting the infrared signal that the second infrared receiver 8 receives is F0, detected value T0 and F0 is stored in the data processing unit 12 of control device 2, as the benchmark calculating change difference, during each unlatching lampblack absorber, detected value T0 and F0 all needs to reset, and when minimizing uses at every turn, external light source is on the impact detected.
After having oil smoke, infrared signal through oil smoke can die down, oil smoke concentration is higher, infrared signal through oil smoke is more weak, the infrared signal detected value that the first infrared receiver 7 now put each detection time receives is T1, and oil smoke concentration is higher, the signal meeting grow of reflected infrared ray, the infrared signal detected value that the second infrared receiver 8 now put each detection time receives is F1.
Then put each detection time, the change difference that the first infrared receiver 7 and the second infrared receiver 8 detect is respectively:
CT=T0 – T1 formula (1)
CF=F1 – F0 formula (2)
By two change difference value, show that total difference C is:
C=CT+CF=(T0 – T1)+(F1 – F0) formula (3)
As can be seen from formula (3), total difference C directly can reflect the presence or absence of oil smoke, and the numerical value of total difference C increases or reduces, then can show the size of oil smoke concentration, total difference C and standard deviation is utilized to compare, and then according to the presence or absence of oil smoke and the rotating speed of concentration control blower fan 3.When the total difference calculated is greater than 0, judges there is oil smoke, namely start blower fan, and according to the difference of total difference C, control the rotating speed that blower fan 3 is different; When the total difference calculated equals 0, judge to have removed totally without oil smoke or oil smoke, namely close blower fan.
In addition, as can be seen from formula (3), oil smoke has unchanged irrelevant with ambient light change etc., the existence eliminating disturbing factor of maximum possible, improve the accuracy of detection of oil smoke concentration, also more accurately control the duty of lampblack absorber, can not exist and take out situation that is unclean or lampblack absorber idle running, realize energy-conserving and environment-protective.
In order to simplify control method, in the present embodiment, standard deviation being divided into multiple interval range, being respectively 0,0-A
1, A
1-A
2... A
n-1-A
n, corresponding is divided into multiple different gear by rotation speed of fan, be respectively shut down shelves, 1 grade, 2 grades ..., N shelves.As, standard deviation can be divided into four interval ranges, be respectively 0,0-A
1, A
1-A
2, A
2-A
3, rotation speed of fan corresponds to four gears, is respectively and shuts down shelves, low grade, middle-grade and high-grade.
Because the infrared signal received is sent to control device 2 by the first infrared receiver 7 and the second infrared receiver 8 continuously, control device 2 can be adopted in two ways: one is, control device 2 calculates total difference C continuously in real time by said method, each actual total difference C of calculating and standard deviation are compared, by judging that total difference C is positioned at a certain interval of standard deviation, and then obtain the rotating speed of blowing machine 3 correspondence, control blower fan 3 by the rotation speed operation drawn by control device 2; Two are, the infrared signal that reality detects carried out calculating total difference C as a time detecting point every a fixed cycle by control device, the more total difference C calculated and standard deviation was compared, and was finally regulated the rotating speed of blower fan 3 by control device 2.In the present embodiment, can select to calculate second and more once every 3-30, more accurate in order to control, can preferably to calculate second and more once every 3-10.
As shown in Figure 4, be described below in detail the control method of lampblack absorber, specifically comprise the steps:
(1) power on.
(2) RF transmitter 6 outwards launches infrared signal continuously, first infrared receiver 7 and the second infrared receiver 8 receiving infrared-ray signal continuously, owing to being now in without oil smoke state, the detected value F0 of the infrared signal detected value T0 that the first infrared receiver 7 receives and the infrared signal that the second infrared receiver 8 receives is stored in the data processing unit 12 of control device 2, as the benchmark calculating change difference.
(3) control device 2 data processing unit 12 every 3 seconds as one detection time point, the signal of the first infrared receiver 7 received and the signal intensity value of the second infrared receiver 8 are calculated, draw total difference C of this detection time of point, compare with the standard deviation prestored.
(4) when the total difference C calculated equals 0, due to now total difference C be in standard deviation " 0 " in interval, judge without oil smoke, control device 2 controls blower fan 3 and keeps stopped status.
(5) when the total difference C calculated is greater than 0, judge there is oil smoke, control device 2 controls blower fan 3 and starts, and now total difference C is in the 0-A of standard deviation
1in scope, then control blower fan 3 with low-grade speed running.
(6) continue to calculate once total difference C every 3 seconds, compare with standard deviation again, judge that total difference C is positioned at a certain interval of standard deviation, and then obtain the rotating speed of blowing machine 3 correspondence, blower fan 3 is controlled by the rotation speed operation drawn by control device 2, along with the increase of oil smoke concentration, total difference C is larger, and blower fan 3 rotating speed is increased to middle-grade and top grade step by step by low grade.
(7) after cooking terminates, blower fan 3 remains in operation, and is continued to siphon away by remaining oil smoke, and along with the reduction of oil smoke concentration, total difference C reduces, and blower fan 3 rotating speed is reduced to middle-grade and low grade step by step by top grade.
(8) when the total difference C calculated equals 0, judge that oil smoke has been removed totally, control device 2 controls blower fan 3 and shuts down.
As mentioned above, plan content given by reference to the accompanying drawings, can derive similar technical scheme.In every case be the content not departing from technical solution of the present invention, any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (10)
1. a lampblack absorber, comprise lampblack absorber body, control device is provided with in described lampblack absorber body, blower fan and oil smoke checkout gear, it is characterized in that: described oil smoke checkout gear comprises a RF transmitter and two infrared receivers, one of them infrared receiver and RF transmitter are arranged on the both sides of described lampblack absorber body air inlet in opposite directions for gathering the infrared ray through oil smoke, another infrared receiver and RF transmitter are arranged on the same side for gathering by the infrared ray of oil smoke blocking reflected, described RF transmitter is connected with described control device with infrared receiver, described control device is according to the rotating speed controlling described blower fan through the infrared detection signal with reflection.
2. a kind of lampblack absorber according to claim 1, it is characterized in that: described control device comprises data processing unit and control unit, described data processing unit is connected with two described infrared receivers and is used for calculating to the infrared ray through oil smoke collected with by the ultrared change difference reflected, and result and standard deviation are compared, draw corresponding rotation speed of fan value and export to described control unit, controlling rotation speed of fan by described control unit.
3. a kind of lampblack absorber according to claim 2, it is characterized in that: described mathematic interpolation is calculate without oil smoke state with have under oil smoke state through the ultrared change difference of oil smoke with by the ultrared change difference reflected respectively, the summation of getting two differences again draws total difference, utilizes total difference and standard deviation to compare.
4. a kind of lampblack absorber according to claim 1, is characterized in that: the RF transmitter and the infrared receiver that are arranged on homonymy are fixedly mounted on a pcb board.
5. a kind of lampblack absorber according to claim 1, is characterized in that: on described lampblack absorber body, be also provided with human-computer interaction interface, described human-computer interaction interface is connected with described control device.
6. the control method of a lampblack absorber, it is characterized in that: the RF transmitter being arranged at air inlet side continues to launch infrared signal, be arranged at the infrared signal of infrared receiver collection through oil smoke of air inlet opposite side, another infrared receiver being positioned at homonymy with RF transmitter gathers by the infrared signal of oil smoke blocking reflected, and two infrared receivers continue to send to control device the infrared signal collected; Control device calculates to the infrared ray through oil smoke received with by the ultrared change difference reflected, and judges oil smoke concentration according to the result of mathematic interpolation; The actual difference calculated and the standard deviation prestored compare by control device, draw the rotation speed of fan value of needs; Control device controls blower fan start-stop and running speed according to the above-mentioned rotation speed of fan value drawn.
7. oil smoke detection method according to claim 6, it is characterized in that: described mathematic interpolation is calculate without oil smoke state with have under oil smoke state through the ultrared change difference of oil smoke with by the ultrared change difference reflected respectively, the summation of getting two differences again draws total difference, utilizes total difference and standard deviation to compare.
8. oil smoke detection method according to claim 7, is characterized in that: when the total difference calculated is greater than 0, judges there is oil smoke, namely starts blower fan; When the total difference calculated equals 0, judge to have removed totally without oil smoke or oil smoke, namely close blower fan.
9. oil smoke detection method according to claim 7, is characterized in that: described standard deviation is divided into multiple interval range, is respectively 0,0-A
1, A
1-A
2... A
n-1-A
n, the different gears of corresponding rotation speed of fan, be respectively shut down shelves, 1 grade, 2 grades ..., N shelves.
10. the oil smoke detection method according to any one of claim 6-9, it is characterized in that: described control device Continuous plus difference, actual difference continuously and standard deviation compare, or actual difference and standard deviation carried out calculating more once every a fixed cycle by described control device.
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| CN201410306416.6A CN105299715B (en) | 2014-06-30 | 2014-06-30 | A kind of lampblack absorber and its control method |
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| CN201410306416.6A CN105299715B (en) | 2014-06-30 | 2014-06-30 | A kind of lampblack absorber and its control method |
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| CN105299715B CN105299715B (en) | 2017-10-13 |
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| CN105650705A (en) * | 2016-02-26 | 2016-06-08 | 广东万和新电气股份有限公司 | Single-key-control range hood and control method thereof |
| CN107062332A (en) * | 2017-04-12 | 2017-08-18 | 顾林鹏 | A kind of lampblack absorber autocontrol method based on capacitance type sensor |
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| CN108266870A (en) * | 2018-01-15 | 2018-07-10 | 广东美的暖通设备有限公司 | Fresh air control device, method, system, computer equipment and storage medium |
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| CN110425616A (en) * | 2019-07-31 | 2019-11-08 | 宁波方太厨具有限公司 | A kind of range hood and its control method |
| CN111044473A (en) * | 2019-12-11 | 2020-04-21 | 华帝股份有限公司 | Oil smoke concentration detection method of oil smoke detection device and range hood |
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| DE102018007504A1 (en) | 2017-09-27 | 2019-03-28 | Diehl Ako Stiftung & Co. Kg | Vapor detector for a cooker hood and extractor hood |
| CN108266870A (en) * | 2018-01-15 | 2018-07-10 | 广东美的暖通设备有限公司 | Fresh air control device, method, system, computer equipment and storage medium |
| CN110208184A (en) * | 2018-07-26 | 2019-09-06 | 华帝股份有限公司 | Oil smoke concentration detection device and range hood |
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| CN110425616A (en) * | 2019-07-31 | 2019-11-08 | 宁波方太厨具有限公司 | A kind of range hood and its control method |
| CN111044473A (en) * | 2019-12-11 | 2020-04-21 | 华帝股份有限公司 | Oil smoke concentration detection method of oil smoke detection device and range hood |
| CN112228934A (en) * | 2020-10-22 | 2021-01-15 | 密波锋 | Intelligent control system and method for pumping and exhausting oil smoke |
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Effective date of registration: 20200803 Address after: 266000, Haier Industrial Park, 236 Qingdao Bay Road, Qingdao economic and Technological Development Zone, Shandong Patentee after: QINGDAO HAIER INTELLIGENT COOKING APPLIANCES CO., LTD. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee before: QINGDAO HAIER DISHWASHER Co.,Ltd. |