CN107576016B - Control method and system of air conditioner - Google Patents
Control method and system of air conditioner Download PDFInfo
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- CN107576016B CN107576016B CN201710865369.2A CN201710865369A CN107576016B CN 107576016 B CN107576016 B CN 107576016B CN 201710865369 A CN201710865369 A CN 201710865369A CN 107576016 B CN107576016 B CN 107576016B
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Abstract
The invention relates to the technical field of air conditioners, in particular to a control method and a control system of an air conditioner. The invention aims to solve the problem of poor quick cooling/heating effect caused by long frequency boosting time in the starting frequency boosting control method of the conventional air conditioner. To this end, the control method of the present invention includes: starting a compressor of an air conditioner; and continuously increasing the frequency of the compressor in stages according to a plurality of set speeds. By continuously increasing the frequency of the compressor in stages at different frequency increasing speeds after the compressor is started, the invention can greatly shorten the frequency increasing time of the compressor while ensuring the normal oil return of the compressor, thereby achieving the purpose of quick refrigeration/heating, improving the comfort of the air conditioner and improving the user experience.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and a control system of an air conditioner.
Background
With the increasing living standard, the requirements of people on the quality of life are higher and higher, and the requirements are particularly obvious on household appliances. Taking an air conditioner as an example, in order to meet the requirement of a user for rapid cooling/heating and further bring comfortable use experience to the user, the conventional air conditioner generally causes the compressor to rapidly increase to a higher frequency (for example, to a maximum working frequency) to operate when the air conditioner is just started. When the compressor is operated, refrigerant in the compressor is rapidly discharged to circulate in the pipe system. In the circulation process, the lubricating oil is discharged out of the compressor along with the refrigerant and enters the pipeline, and the dynamic balance of the lubricating oil in the whole system can be maintained only if the discharged part of the lubricating oil smoothly returns to the compressor (namely, oil return), otherwise, the compressor is damaged due to oil shortage. Most of air conditioners in the market at present adopt an arrangement mode of combining an oil separator and an oil return capillary tube, and lubricating oil discharged from a compressor is separated out through the oil separator and then returns to the compressor through the oil return capillary tube. However, for the variable frequency air conditioner, since the maximum oil return speed/rate of the oil return capillary tube is constant, and as the discharge speed/rate of the lubricating oil increases with the frequency of the compressor, the oil shortage is easily caused when the discharge speed/rate of the lubricating oil exceeds the maximum oil return speed/rate of the oil return capillary tube. Therefore, in order to ensure normal oil return, during the process of rapidly raising the frequency of the compressor to a high frequency, the compressor is usually forced to operate for a period of time at a certain fixed frequency (oil return frequency), and the frequency raising is continued after the oil return is stable.
Although normal oil return is guaranteed by the arrangement mode, the compressor is forced to continuously run for a period of time on the oil return frequency, so that the frequency rising time of the compressor is too long in the process of starting the air conditioner for quick refrigeration/heating, the speed of the compressor reaching the maximum working frequency is slowed down, the time for quick refrigeration/heating after the air conditioner is started is increased, the effect of quick heating/cooling of the air conditioner is influenced, and poor use experience is brought to a user. That is, the above-mentioned method for controlling the start-up frequency rising of the air conditioner has a problem that the quick cooling/heating effect is poor due to the long frequency rising time.
Accordingly, there is a need in the art for a new control method of an air conditioner to solve the above-mentioned problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem of poor rapid cooling/heating effect caused by long frequency boosting time in the conventional method for controlling the start-up frequency boosting of an air conditioner, the present invention provides a method for controlling an air conditioner, which comprises the following steps:
starting a compressor of the air conditioner;
and continuously increasing the frequency of the compressor in stages according to a plurality of set speeds.
In a preferable embodiment of the control method of the air conditioner, the control method further includes:
after the frequency is continuously increased in stages, judging whether the frequency of the compressor reaches a first target frequency;
stopping the compressor from increasing frequency when the compressor frequency reaches the first target frequency.
In a preferred embodiment of the above air conditioner control method, the step of "causing the compressor to continuously increase in stages at a plurality of set speeds" further includes:
enabling the compressor to perform frequency boosting according to a first frequency boosting speed;
judging whether the frequency of the compressor reaches a transition frequency;
when the frequency of the compressor reaches the transition frequency, the compressor is enabled to carry out frequency raising according to a second frequency raising speed;
wherein the transition frequency is less than the first target frequency.
In a preferable technical solution of the control method of the air conditioner, the first frequency increasing speed is greater than the second frequency increasing speed; and/or the first target frequency is a maximum operating frequency of the compressor.
In a preferable embodiment of the control method of the air conditioner, the control method further includes:
acquiring an environmental parameter;
and when the environmental parameter reaches a target parameter, the compressor is subjected to frequency reduction to a second target frequency.
In a preferred technical solution of the control method of the air conditioner, the environmental parameter is an environmental temperature or an environmental humidity, and the target parameter is a target temperature or a target humidity correspondingly.
The invention also provides a control system of the air conditioner, which mainly comprises:
a control module for starting a compressor of the air conditioner and continuously increasing the frequency of the compressor in stages according to a plurality of set speeds, an
Stopping the frequency up-conversion of the compressor when the frequency of the compressor reaches a first target frequency;
and the judging module is used for judging whether the compressor frequency reaches the first target frequency.
In a preferred embodiment of the control system of the air conditioner, the control module sequentially increases the frequency of the compressor in stages at a plurality of set speeds in the following manner:
the control module enables the compressor to carry out frequency raising according to a first frequency raising speed;
the judging module judges whether the frequency of the compressor reaches a transition frequency;
when the frequency of the compressor reaches the transition frequency, the control module enables the compressor to carry out frequency increasing according to a second frequency increasing speed;
wherein the transition frequency is less than the first target frequency; and/or
The first frequency-increasing speed is greater than the second frequency-increasing speed.
In a preferred embodiment of the control system of the air conditioner, the control system further includes:
the acquisition module is used for acquiring environmental parameters;
the judging module is also used for judging whether the environmental parameters reach target parameters;
the control module is further configured to down-convert the compressor to a second target frequency when the environmental parameter reaches the target parameter.
In a preferred technical solution of the control system of the air conditioner, the environmental parameter is an environmental temperature or an environmental humidity, and the target parameter is a target temperature or a target humidity correspondingly.
As can be understood by those skilled in the art, in a preferred embodiment of the present invention, a control method of an air conditioner includes: starting the compressor; continuously increasing the frequency of the compressor in stages according to a plurality of set speeds; after the frequency is continuously increased in stages, judging whether the frequency of the compressor reaches a first target frequency; and stopping the frequency increasing of the compressor when the frequency of the compressor reaches the first target frequency. By canceling the continuous operation stage on the oil return frequency in the frequency increasing process of the compressor and continuously increasing the frequency of the compressor in stages at different frequency increasing speeds after the compressor is started, the invention can greatly shorten the frequency increasing time of the compressor, thereby achieving the purpose of rapid refrigeration/heating, improving the comfort of the air conditioner and improving the user experience.
Specifically, after the compressor is started, the compressor is first ramped at a first ramp rate, the compressor is ramped at a second ramp rate when the compressor frequency reaches a transition frequency, and the compressor is stopped ramping when the compressor frequency reaches a first target frequency. The transition frequency is smaller than the first target frequency, and the first frequency increasing speed is larger than the second frequency increasing speed. Preferably, the first target frequency is a maximum operating frequency of the compressor. Repeated experiments show that the frequency of the compressor is divided into two or more stages at the frequency increasing speed of first-speed and second-speed to increase the frequency, so that the normal oil return of the compressor can be ensured through the staged change of the frequency increasing speed, the time for increasing the frequency of the compressor to the maximum working frequency can be greatly shortened, and the requirement of quick refrigeration/heating of a user is met.
Drawings
The control method and system of the air conditioner of the present invention will be described with reference to the accompanying drawings in conjunction with the air conditioner operating in a cooling mode. In the drawings:
fig. 1 is a flowchart illustrating a control method of an air conditioner according to the present invention;
fig. 2 is a schematic diagram comparing the frequency increasing process of the compressor of the control method of the air conditioner of the present invention with that of the prior art compressor;
fig. 3 is a schematic diagram illustrating a control logic of a compressor when the control method of the air conditioner of the present invention is applied to a cooling mode of the air conditioner.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the operation of the compressor of the present invention is described with reference to the operation of the air conditioner in the cooling mode in fig. 3, this application scenario is not constant, and those skilled in the art can also apply the method of the present invention to other application scenarios, such as a heating mode or a dehumidifying mode of the air conditioner, without departing from the principle of the present invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating a control method of an air conditioner according to the present invention.
As shown in fig. 1, in order to solve the problem of poor rapid cooling/heating effect caused by long frequency boosting time in the start-up frequency boosting control method of the conventional air conditioner, the present invention provides a control method of an air conditioner, which mainly comprises the following steps:
s100, starting a compressor of the air conditioner, for example, starting the air conditioner by pressing a switch by a user and starting the compressor by selecting an operation mode (refrigeration or heating and the like);
s200, enabling the compressor to continuously increase the frequency in stages according to a plurality of set speeds, wherein if the compressor is started, the control system of the air conditioner enables the compressor to increase the frequency according to a first frequency increasing speed, and immediately switches to a second frequency increasing speed to continue increasing the frequency after the compressor operates to a certain frequency or operates for a period of time;
s300, judging whether the frequency of the compressor reaches a first target frequency, for example, a control system of the air conditioner acquires the current frequency of the compressor in real time, and comparing the current frequency with the first target frequency;
s400, when the frequency of the compressor reaches the first target frequency, the compressor stops increasing the frequency, and if the current frequency reaches the first target frequency, the control system enables the compressor to keep working at the first target frequency continuously.
It can be seen from the above description that the control method of the air conditioner of the present invention can greatly shorten the frequency increasing time of the compressor by the setting mode of continuously increasing the frequency by stages at different frequency increasing speeds after the compressor is started, so as to achieve the purpose of rapid cooling/heating. In other words, the method cancels the process of continuous operation on the oil return frequency in the frequency increasing process of the compressor, ensures the normal oil return of the compressor by controlling the frequency increasing speed, and can complete the rapid frequency increasing of the compressor, solve the problem of poor rapid refrigerating/heating effect caused by long frequency increasing time in the existing starting frequency increasing control method, improve the comfort of the air conditioner and improve the user experience.
The principles of the present invention are further explained with reference to fig. 2. Fig. 2 is a schematic diagram comparing the frequency increasing process of the compressor of the control method of the air conditioner according to the present invention with that of the compressor of the prior art. In fig. 2, a solid line represents an up-conversion process of the compressor in the control method of the present invention, and a dotted line represents an up-conversion process of the compressor in the related art.
As shown in fig. 2, in the prior art, a fixed frequency-increasing speed V (e.g. 1Hz/s) is generally adopted for frequency-increasing after the compressor is started, and a first oil-returning frequency f is set during the frequency-increasing process to ensure normal oil-returning of the compressor1And a second oil return frequency f2When the compressor is raised to the first oil return frequency f1When the frequency of the compressor is increased, the frequency of the compressor is increased at the frequency increasing speed V, and the frequency of the compressor is increased at the frequency increasing speed V. Likewise, the frequency of the compressor is increased to a second oil return frequency f2And maintaining the frequency for a period of time to ensure that the compressor continues to increase the frequency after stable oil return until the compressor reaches the maximum frequency fmaxAnd then stopping the frequency raising. As described in the background, such an up-conversion is due to the first oil return frequency f1And a second oil return frequency f2The temperature is maintained for a period of time, so the frequency increasing speed of the compressor is seriously influenced, and although the stable oil return of the compressor is ensured, the requirement of quick refrigeration/heating cannot be well met.
With continued reference to FIG. 2, as a preferred embodiment of the present invention, the continuous up-conversion process of the compressor may be divided into two stages, wherein the first stage compressor operates at a first up-conversion speed V1And performing frequency raising, and entering a second stage when the frequency is raised to the transition frequency. The second stage compressor at a second raising speed V2And performing frequency raising, and stopping frequency raising when the frequency is raised to the first target frequency. Preferably, the transition frequency may be set to the first oil return frequency f1. First raising frequency speed V1Greater than the second up-conversion speed V2For example, the first up-conversion rate may be set to 1Hz/s and the second up-conversion rate may be set to 0.5 Hz/s.
That is to say, in the control method of the present invention, S200 may further include the following steps:
s210, enabling the compressor to follow a first frequency increasing speed V1Performing frequency raising, such as raising the frequency of the compressor at a frequency raising speed of 1Hz/s by a control system of the air conditioner;
s220, judging whether the frequency of the compressor reaches the transition frequency, if so, setting the transition frequency as the first oil return frequency f1The control system judges whether the current frequency of the compressor reaches the first oil return frequency f1；
S230, reaching a transition frequency f at the frequency of the compressor1While the compressor is driven at a second up-conversion speed V2Performing frequency raising, e.g. at the control system determining that the current frequency of the compressor reaches f1And continuously increasing the frequency of the compressor according to the frequency increasing speed of 0.5Hz/s so as to continuously increase the frequency on the premise of ensuring the stable oil return of the compressor and finish the quick refrigeration/heating of the air conditioner.
Preferably, the transition frequency f1Less than a first target frequency set to the maximum operating frequency f of the compressormax。
The control method of the air conditioner has the advantages that: by controlling the frequency-raising speed of the compressor in the frequency-raising process, the speed/speed of the lubricating oil discharged from the compressor is correspondingly changed in the frequency-raising process of the compressor at different frequency-raising speeds, so that the oil return speed/speed of the oil return capillary tube is adapted, and the oil return stability of the compressor is ensured. Specifically, the compressor is set to change the frequency raising speed at the transition frequency, that is, to raise the frequency in two stages of the frequency raising speed which is fast first and slow second, so that the compressor is raised at the first frequency raising speed V1At the frequency of the ramp up, the speed/rate of discharge of the lubricant out of the compressor reaches or exceeds the oil return speed/rate of the oil return capillary tube. When the transition frequency is reached, the compressor is switched to follow a second raising speed V2The frequency is increased, the lubricating oil flowing out of the compressor is greatly reduced, the speed/speed of the lubricating oil discharged out of the compressor is smaller than the oil return speed/speed of the oil return capillary tube, and the lubricating oil quantity in the compressor is further ensured. That is, the invention can ensure the normal oil return of the compressor by the change of the frequency raising speed and simultaneously cancel the oil return frequencyThe control mode of the last continuous operation stage correspondingly accelerates the frequency raising speed of the compressor, so that the compressor can be raised to the maximum working frequency more quickly, and then the compressor is operated at the maximum working frequency, and the requirement of quick refrigeration/heating of a user is met. As is apparent from fig. 2, through repeated experiments by the inventor, the time for the compressor of the present invention to reach the maximum operating frequency is significantly less than the time for the compressor of the prior art to reach the maximum operating frequency.
Of course, the above preferred setting manner and specific values are only used for illustrating the principle of the present invention, and are not intended to limit the protection scope of the present invention, and those skilled in the art can also make any type of adjustment on the above parameters without departing from the principle of the present invention, as long as the adjusted technical scheme can improve the condition of raising the frequency raising speed on the premise of ensuring normal oil return of the compressor. If the frequency raising stage can be further divided into three stages, each stage raises the frequency at different frequency raising speeds (such as fast and slow modes); the transition frequency can also float up and down according to the first oil return frequency; the first target frequency is not the maximum operating frequency of the compressor but a value close to the maximum operating frequency, etc.
In addition, in order to better improve the experience of the user using the air conditioner, when the compressor operates at the maximum operating frequency, the control method of the air conditioner of the present invention may further include the steps of:
s500, acquiring environmental parameters, such as current environmental temperature (such as indoor/outdoor temperature);
s600, when the environmental parameter reaches/approaches the target parameter, the compressor is reduced to a second target frequency, for example, when the indoor temperature reaches the target temperature set by a user or approaches the target temperature, the compressor is reduced to the rated working frequency or a lower working frequency.
The advantages of this arrangement are: after the air conditioner is rapidly cooled/heated for a period of time, the ambient temperature can correspondingly drop/rise, when the ambient temperature reaches/approaches the temperature set by a user, the compressor does not need to continuously work at the maximum working frequency, and at the moment, the frequency of the compressor is reduced to the rated working frequency or the lower working frequency which is more matched with the current environment, so that the normal work of the air conditioner can be ensured, and the service life of the compressor can be effectively prolonged.
Of course, the environmental parameter and the corresponding target parameter are not all the same, but may be environmental humidity (such as indoor/outdoor humidity), target humidity set by a user, and the like.
The invention also provides a control system of the air conditioner, which mainly comprises:
a control module for starting the compressor and causing the compressor to ramp up continuously in stages at a plurality of set speeds, an
Stopping the frequency increasing of the compressor when the frequency of the compressor reaches a first target frequency;
and the judging module is used for judging whether the compressor reaches the first target frequency.
Wherein, the control module makes the compressor according to a plurality of setting speed, continuous raising frequency in stages according to following mode:
the control module makes the compressor according to a first frequency raising speed V1Performing frequency boosting;
the judging module judges whether the frequency of the compressor reaches the transition frequency f1；
Reaching a transition frequency f at the compressor frequency1The control module causes the compressor to operate at a second ramp-up speed V2Performing frequency boosting;
preferably, the first up-conversion speed V1Greater than the second up-conversion speed V2Transition frequency f1Less than a first target frequency, and the first target frequency is the maximum operating frequency f of the compressormax。
In addition, the control system of the air conditioner further includes:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring environmental parameters, such as outdoor/indoor temperature, outdoor/indoor humidity and the like;
after the acquisition module acquires the environmental parameters, the judgment module is further used for judging whether the environmental parameters reach target parameters, such as target temperature of refrigeration/heating set by a user or set target humidity;
the control module is also used for reducing the frequency of the compressor to a second target frequency when the environmental parameter reaches the target parameter, and for example, the control module reduces the frequency of the compressor to a rated working frequency when the indoor temperature reaches the target temperature set by a user.
Those skilled in the art can understand that the physical forms of the control module, the judgment module and the acquisition module can be independent from each other, and of course, the control module, the judgment module and the acquisition module can also be functional units integrated on one physical module. The control system of the air conditioner comprises a memory, a processor and a computer program which is stored in the memory and can run on the processor, wherein the computer program can complete the functions of the control module, the judgment module and the acquisition module.
The operation principle of the air conditioner control method and system of the present invention will be briefly described with reference to fig. 3. Fig. 3 is a schematic diagram of control logic of a compressor when the control method of the air conditioner of the present invention is applied to a cooling mode of the air conditioner.
As shown in fig. 3, when the air conditioner is in the cooling mode, the operation process of the compressor may be:
air conditioner start-up refrigeration → compressor start-up according to the raising frequency speed V1' Up-conversion → Via T1The compressor frequency reaches the transition frequency f after a time interval1At an up-conversion speed V2' continuous up-conversion → warp T2The compressor frequency reaches the maximum operating frequency f after a time interval2' and stop raising frequency → warp T3After a time interval, the indoor temperature reaches the set temperature of the user, and the compressor reduces the frequency at a speed V3' Down-conversion → Via T4After a time interval the compressor frequency is reduced to the nominal operating frequency f3' and stops down-converting and maintains at this frequency.
In the above preferred embodiment, the air conditioner control method mainly includes: starting the compressor; make the compressor follow the first raising frequency speed V1And a second up-conversion speed V2Continuously increasing the frequency; judging whether the frequency of the compressor reaches the maximum working frequency fmax(ii) a When the frequency of the compressor reaches the maximum operating frequency fmaxAnd then stopping the frequency raising. Wherein the first raising frequency speed V1Greater than the second up-conversion speed V2. Air conditionerThe control system comprises a control module, a judgment module and an acquisition module. The compressor is arranged in a frequency increasing mode in two stages of increasing the frequency speed first to be fast and then to be slow, so that the compressor can ensure normal oil return of the compressor through the change of the frequency increasing speed, can also increase the frequency to the maximum working frequency quickly, further operates at the maximum working frequency, and meets the requirement of quick refrigeration/heating of a user.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A control method of an air conditioner, characterized by comprising the steps of:
starting a compressor of the air conditioner;
continuously increasing the frequency of the compressor in stages according to a plurality of set speeds;
the step of "causing the compressor to continuously frequency up in stages at a plurality of set speeds" further comprises:
enabling the compressor to perform frequency boosting according to a first frequency boosting speed;
judging whether the frequency of the compressor reaches a transition frequency;
and when the frequency of the compressor reaches the transition frequency, the compressor is enabled to carry out frequency increasing according to a second frequency increasing speed.
2. The control method of an air conditioner according to claim 1, further comprising:
after the frequency is continuously increased in stages, judging whether the frequency of the compressor reaches a first target frequency;
stopping the compressor from increasing frequency when the compressor frequency reaches the first target frequency.
3. The control method of an air conditioner according to claim 2, wherein the transition frequency is less than the first target frequency.
4. The control method of an air conditioner according to claim 3, wherein the first frequency-increasing speed is greater than the second frequency-increasing speed; and/or the first target frequency is a maximum operating frequency of the compressor.
5. The control method of an air conditioner according to any one of claims 1 to 4, further comprising:
acquiring an environmental parameter;
and when the environmental parameter reaches a target parameter, the compressor is subjected to frequency reduction to a second target frequency.
6. The method of claim 5, wherein the environmental parameter is an environmental temperature or an environmental humidity, and the target parameter is a target temperature or a target humidity, respectively.
7. A control system of an air conditioner, characterized in that the control system comprises:
the control module is used for starting a compressor of the air conditioner, enabling the compressor to continuously increase the frequency in stages according to a plurality of set speeds, and stopping the compressor from increasing the frequency when the frequency of the compressor reaches a first target frequency;
a judging module for judging whether the compressor frequency reaches the first target frequency;
the control module steps the compressor up continuously at a plurality of set speeds in the following manner:
the control module enables the compressor to carry out frequency raising according to a first frequency raising speed;
the judging module judges whether the frequency of the compressor reaches a transition frequency;
and when the frequency of the compressor reaches the transition frequency, the control module enables the compressor to carry out frequency increasing according to a second frequency increasing speed.
8. The control system of an air conditioner according to claim 7, wherein the transition frequency is less than the first target frequency; and/or
The first frequency-increasing speed is greater than the second frequency-increasing speed.
9. The control system of an air conditioner according to claim 7, further comprising:
the acquisition module is used for acquiring environmental parameters;
the judging module is also used for judging whether the environmental parameters reach target parameters;
the control module is further configured to down-convert the compressor to a second target frequency when the environmental parameter reaches the target parameter.
10. The control system of claim 9, wherein the environmental parameter is an environmental temperature or an environmental humidity, and the target parameter is a target temperature or a target humidity, respectively.
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| CN116255725A (en) * | 2023-01-15 | 2023-06-13 | 杭州益川电子有限公司 | Compressor driven variable frequency control system |
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| CN101539151B (en) * | 2008-03-18 | 2013-06-12 | 海尔集团公司 | Method and device for controlling inverter compressor |
| CN101718459B (en) * | 2009-11-10 | 2012-05-23 | 广东美的电器股份有限公司 | Method for controlling inverter air conditioner |
| CN101968249B (en) * | 2010-09-09 | 2012-12-19 | 宁波奥克斯电气有限公司 | Method for regulating normal operating frequency of DC inverter compressor |
| CN103968497B (en) * | 2013-01-30 | 2017-05-10 | 珠海格力电器股份有限公司 | Method and device for adjusting running frequency of air conditioning compressor as well as air conditioner |
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Effective date of registration: 20200915 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Co-patentee after: QINGDAO HAIER (JIAOZHOU) AIR CONDITIONER Co.,Ltd. Patentee after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee before: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. |
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Effective date of registration: 20201104 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Patentee after: QINGDAO HAIER (JIAOZHOU) AIR CONDITIONER Co.,Ltd. Patentee after: Haier Zhijia Co.,Ltd. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee before: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Patentee before: QINGDAO HAIER (JIAOZHOU) AIR CONDITIONER Co.,Ltd. |