CN112460733A - Method and device for cleaning degree of heat exchanger - Google Patents
Method and device for cleaning degree of heat exchanger Download PDFInfo
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- CN112460733A CN112460733A CN202011243172.3A CN202011243172A CN112460733A CN 112460733 A CN112460733 A CN 112460733A CN 202011243172 A CN202011243172 A CN 202011243172A CN 112460733 A CN112460733 A CN 112460733A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- Combustion & Propulsion (AREA)
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- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a method and a device for judging the cleanliness of a heat exchanger. The method for judging the cleanliness of the heat exchanger comprises the following steps: acquiring a first temperature of an air outlet before cleaning and a second temperature of the air outlet after cleaning; if the absolute value of the difference value between the first temperature and the second temperature is larger than a preset temperature threshold value, the cleanness degree of the heat exchanger is confirmed to reach the standard; and if the absolute value of the difference value of the first temperature and the second temperature is larger than a preset temperature threshold value, cleaning the heat exchanger again until the cleaning degree of the heat exchanger reaches the standard and/or a cleaning stopping instruction is received. The invention obtains the degree of cleanness of the heat exchanger after the heat exchanger is cleaned and judges whether the degree of cleanness reaches the standard or not, thereby avoiding stopping cleaning when the degree of cleanness does not reach the standard and avoiding the condition that the degree of cleanness reaches the standard but is still continuously cleaned.
Description
Technical Field
The invention relates to the technical field of heat exchangers, in particular to a method and a device for cleaning degree of a heat exchanger.
Background
As devices with heat exchangers, such as air conditioners, become more intelligent, the cleaning function of the heat exchangers becomes more important. In the accumulated operation of the heat exchanger, pollutants such as dust, mold and the like can be gradually accumulated, so that the circulation of air is blocked, and the temperature adjusting function of equipment such as an air conditioner is reduced. How to accurately judge whether the cleanness reaches the standard becomes an essential important function in the cleaning function. How to properly solve the above problems is an urgent issue to be solved in the industry.
Disclosure of Invention
The invention provides a method and a device for cleaning degree of a heat exchanger, which are used for accurately knowing whether the cleaning degree of the heat exchanger after the cleaning reaches the standard or not.
According to a first aspect of the embodiments of the present invention, a method for determining a degree of cleanliness of a heat exchanger is provided, including: acquiring a first temperature of an air outlet before cleaning and a second temperature of the air outlet after cleaning;
if the absolute value of the difference value between the first temperature and the second temperature is larger than a preset temperature threshold value, the cleanness degree of the heat exchanger is confirmed to reach the standard;
and if the absolute value of the difference value of the first temperature and the second temperature is larger than a preset temperature threshold value, cleaning the heat exchanger again until the cleaning degree of the heat exchanger reaches the standard and/or a cleaning stopping instruction is received.
In one embodiment, the obtaining the first temperature of the pre-cleaning outlet and the second temperature of the post-cleaning outlet includes:
under the conditions of a preset operation environment and preset operation parameters, a first temperature of the air outlet before cleaning and a second temperature of the air outlet after cleaning are obtained.
In one embodiment, the obtaining a first temperature of the air outlet before cleaning and a second temperature of the air outlet after cleaning further includes:
when the heat exchanger runs to a detection time interval, acquiring a first temperature of the air outlet before cleaning and a second temperature of the air outlet after cleaning.
In one embodiment, the obtaining a first temperature of the air outlet before cleaning and a second temperature of the air outlet after cleaning further includes:
the method comprises the steps of obtaining a first temperature of an air outlet before cleaning and a second temperature of the air outlet after cleaning under the condition that the temperature of the air outlet is monitored to be continuously stable at a certain temperature for a preset duration.
In one embodiment, the determining that the cleanliness of the heat exchanger is up to the standard if the absolute value of the difference between the first temperature and the second temperature is greater than a preset temperature threshold includes:
under the condition that the heat exchanger is in a refrigeration mode, if the absolute value of the first temperature and the absolute value of the second temperature are larger than a preset refrigeration temperature threshold value, the cleanliness of the heat exchanger is confirmed to reach the standard;
and under the condition that the heat exchanger is in a heating mode, if the absolute value of the first temperature and the absolute value of the second temperature are greater than a preset heating stability threshold value, the cleanness degree of the heat exchanger is confirmed to reach the standard.
In one embodiment, further comprising:
and when the cleanliness degree of the heat exchanger is judged, sending a corresponding judgment result to an intelligent terminal bound with the heat exchanger, wherein the intelligent terminal can send an instruction for controlling the heat exchanger.
According to a second aspect of the embodiments of the present invention, there is provided an apparatus for determining a degree of cleanliness of a heat exchanger, including:
the acquiring module is used for acquiring a first temperature of the air outlet before cleaning and a second temperature of the air outlet after cleaning;
the judging module is used for confirming that the cleanliness degree of the heat exchanger reaches the standard if the absolute value of the difference value of the first temperature and the second temperature is larger than a preset temperature threshold;
and the judging module is further used for cleaning the heat exchanger again if the absolute value of the difference value of the first temperature and the second temperature is larger than a preset temperature threshold value until the cleaning degree of the heat exchanger reaches the standard and/or a cleaning stopping instruction is received.
In one embodiment, further comprising: the obtaining module and the judging module are controlled to execute the judging method in any one of the above embodiments.
According to a third aspect of embodiments of the present invention, an electronic device is provided, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor implements the steps of the method provided in the first aspect when executing the program.
According to a fourth aspect of embodiments of the present invention, there is also provided a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method as provided by the first aspect.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding 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 principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart illustrating a method of cleanliness of a heat exchanger in accordance with an exemplary embodiment of the present invention;
fig. 2 is a flowchart illustrating a step S11 of a method for cleanliness of a heat exchanger according to an exemplary embodiment of the present invention;
fig. 3 is a flowchart illustrating a step S11 of a method of cleaning a heat exchanger according to another exemplary embodiment of the present invention;
fig. 4 is a flowchart illustrating a step S11 of a method of cleaning a heat exchanger according to still another exemplary embodiment of the present invention;
fig. 5 is a flowchart illustrating a step S12 of a method for cleanliness of a heat exchanger according to an exemplary embodiment of the present invention;
FIG. 6 is a flow chart illustrating a method of cleanliness of a heat exchanger according to another exemplary embodiment of the present invention;
FIG. 7 is a block diagram illustrating an apparatus for cleaning a heat exchanger according to an exemplary embodiment of the present invention;
fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Fig. 1 is a flowchart illustrating a method for determining a degree of cleanliness of a heat exchanger according to an exemplary embodiment, and as shown in fig. 1, the method for determining a degree of cleanliness of a heat exchanger includes the following steps S11-S13:
in step S11, a first temperature of the air outlet before cleaning and a second temperature of the air outlet after cleaning are obtained;
in step S12, if the absolute value of the difference between the first temperature and the second temperature is greater than a preset temperature threshold, it is determined that the degree of cleanliness of the heat exchanger reaches the standard;
in step S13, if the absolute value of the difference between the first temperature and the second temperature is greater than the preset temperature threshold, cleaning the heat exchanger again until the degree of cleaning of the heat exchanger reaches the standard and/or a cleaning termination command is received.
In one embodiment, for convenience of description, all equipment equipped with a heat exchanger is represented by an air conditioner. The more intelligent the air conditioner, the more important the clean function of the heat exchanger. In the accumulated operation of the heat exchanger, pollutants such as dust, mold and the like can be gradually accumulated, so that the circulation of air is blocked, and the temperature adjusting function of the air conditioner is reduced. The technical scheme in the embodiment can accurately and timely judge whether the cleanness reaches the standard.
A temperature monitor is arranged at an air outlet of the air conditioner to acquire the temperature of the air outlet in real time, and the temperature adjusting capacity of the air conditioner is equivalently acquired. Obtaining the temperature T of the air outlet before cleaning0Temperature T of forehead air outlet after first cleaning1Temperature T of forehead outlet after ith cleaningi. The first temperature is always T0The second temperature is TiThe preset temperature threshold is A. After each cleaning, a first temperature T is calculated0And a second temperature TiThe absolute value delta T of the difference value is calculated, and the absolute value delta T and the preset temperature threshold value A are calculated, so that the cleanliness of the heat exchanger can reach the standard. The preset temperature threshold value A is determined according to the attenuation degree of the heat exchange effect before and after the heat exchanger is dirty and blocked, and can be determined after multiple experiments of the limit boundary working condition are carried out according to the attenuation degree of the heat exchange effect before and after the heat exchanger is dirty and blocked, and the experiment result of the minimum refrigeration and the maximum refrigeration boundary conditions before and after the reference heat exchanger is dirty and blocked is included, so that the situation that the value is unreasonable to be formulated, the self-cleaning effect is not consistent with the actual effect is detected, and error information is output.
And calculating the absolute value delta T and the preset temperature threshold value A to obtain that the cleanliness of the heat exchanger reaches the standard. The larger the Δ T is, the larger the difference between the outlet air temperatures before and after self-cleaning is, the better the cleaning degree is, and the higher the cleaning degree of the heat exchanger is. The specific relationship is shown in the following table 1:
TABLE 1
| Determination conditions | The result of the judgment | Subsequent default operation |
| ΔT≥A | The cleanliness reaches the standard | Stopping cleaning |
| ΔT＜A | The cleanliness degree does not reach the standard | Continuously clean |
And when the cleanliness degree of the heat exchanger does not reach the standard, the system defaults to continuously perform the cleaning. And under the condition that the cleanliness degree of the heat exchanger does not reach the standard, if a user wants to stop cleaning, a corresponding cleaning stopping instruction can be sent. And under the condition that the cleanliness of the heat exchanger reaches the standard, if a user wants to continue cleaning, a corresponding cleaning continuing instruction can be sent. The priority of the system receiving the instruction is higher than the default priority of the system.
In addition, the cleaning of pollutants such as dust, mold and the like on the surface of the heat exchanger can ensure that the circulation of air becomes more smooth, and the air outlet volume of the air outlet is increased. The cleanliness of the heat exchanger can be judged by simultaneously combining the change of the air output and the change of the temperature.
The technical scheme in the embodiment obtains the current cleaning degree after cleaning the heat exchanger and judges whether the cleaning degree reaches the standard or not, so that cleaning is stopped without reaching the standard, cleaning is continued after reaching the standard is avoided, and subjective operation of a user is accepted.
In one embodiment, as shown in FIG. 2, step S11 further includes the following step S21:
in step S21, under the conditions of the preset operation environment and the preset operation parameters, a first temperature of the air outlet before cleaning and a second temperature of the air outlet after cleaning are obtained.
In one embodiment, the cleaning process is performed in order to ensure the accuracy of the determination result. It is necessary to ensure the stability of the operating environment of the air conditioner and the operating parameters of the air conditioner. The operation environment of the air conditioner comprises indoor air inlet temperature, indoor air outlet temperature, outdoor unit air inlet temperature and the like. The operation parameters of the air conditioner comprise the rotating speed of the inner fan, the rotating speed of the outer fan, the step number of the throttling valve, the frequency of the compressor and the like. In a preferred embodiment, the preset operation environment and the preset operation parameters may be set to the operation environment and the operation parameters at the time of starting cleaning. .
In one embodiment, as shown in FIG. 3, step S11 further includes the following step S31:
in step S31, when the heat exchanger operates to the detection duration, a first temperature of the air outlet before cleaning and a second temperature of the air outlet after cleaning are obtained.
In one embodiment, the air conditioner starts to operate for an initial period of time t1Within this, various unexpected interference factors may affect the stability of the measured temperature values due to various complex factors. So it is necessary to have a period t of time in the first period1Then, the temperature of the air outlet of the air conditioner reaches a relatively stable state. At the same time, the operation is performed for a longer time t2Then, the air conditioner can cause the temperature change in a certain space, thereby further feeding back the temperature of the air outlet of the air conditioner. Therefore, the ideal temperature monitoring interval is t1To t2In the meantime.
In one embodiment, as shown in FIG. 4, step S11 further includes the following step S41:
in step S41, when the temperature of the air outlet is continuously stable at a certain temperature for a preset duration, a first temperature of the air outlet before cleaning and a second temperature of the air outlet after cleaning are obtained.
In one embodiment, the temperature at the outlet of the air conditioner reaches a certain temperature TjAfter maintaining the temperature TjUnchanged, if continuously stabilized at the temperature TjThe operation time reaches the preset duration tdThe operating state of the air conditioner can be considered to enter a stable state, and the stable state can truly reflect the output efficiency of the heat exchanger at the moment, and the output efficiencyIs positively correlated with the cleanliness of the heat exchanger, so that the temperature of the air outlet is continuously and stably kept at a certain temperature T when being monitoredjReaches the preset duration tdUnder the condition, the first temperature of the air outlet before cleaning and the second temperature of the air outlet after cleaning are obtained to be the true and reliable temperature data.
In one embodiment, as shown in FIG. 5, step S12 includes the following steps S51-S52:
in step S51, if the absolute value of the first temperature and the absolute value of the second temperature are greater than a preset cooling temperature threshold value, it is determined that the degree of cleanliness of the heat exchanger reaches the standard;
in step S52, if the heat exchanger is in the heating mode, if the absolute value of the first temperature and the absolute value of the second temperature are greater than a preset thermal stability threshold, it is determined that the cleanliness of the heat exchanger reaches the standard.
In one embodiment, the heat exchanger can not only cool but also heat, but different temperature thresholds exist in the cooling mode and the heating mode, so that the heat exchanger in different operation modes needs to be determined in a targeted manner.
In one embodiment, as shown in fig. 6, the following step S61 is further included:
in step S61, when the cleanliness of the heat exchanger is determined, a corresponding determination result is sent to the intelligent terminal bound to the heat exchanger, and the intelligent terminal can issue an instruction for controlling the heat exchanger.
In one embodiment, no matter whether the cleanliness of the heat exchanger is judged to be up to the standard or not, the system sends a corresponding judgment result to an intelligent terminal bound with the heat exchanger, and the intelligent terminal can be a remote controller or an intelligent terminal such as a smart phone and the like which has a binding relationship with the heat exchanger. The user can operate in the intelligent terminal to send some instructions to control the heat exchanger to perform specific operations corresponding to the instructions, such as terminating a cleaning instruction or continuing a cleaning instruction.
In one embodiment, FIG. 7 is an apparatus block diagram illustrating cleanliness of a heat exchanger according to an exemplary embodiment. As shown in fig. 7, the apparatus includes an acquisition module 71 and a determination module 72.
The acquiring module 71 is configured to acquire a first temperature of the air outlet before cleaning and a second temperature of the air outlet after cleaning;
the judging module 72 is configured to determine that the degree of cleanliness of the heat exchanger reaches the standard if the absolute value of the difference between the first temperature and the second temperature is greater than a preset temperature threshold;
the determining module 72 is further configured to clean the heat exchanger again if the absolute value of the difference between the first temperature and the second temperature is greater than the preset temperature threshold value until the degree of cleanness of the heat exchanger reaches the standard and/or a cleaning termination instruction is received.
The heat exchanger cleanliness acquisition module 71 and the heat exchanger cleanliness determination module 72 are controlled to perform the method for cleanliness of a heat exchanger as set forth in any of the above embodiments.
Fig. 8 illustrates a physical structure diagram of a server, and as shown in fig. 8, the server may include: a processor (processor)810, a communication Interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication Interface 820 and the memory 830 communicate with each other via the communication bus 840. The processor 810 may call logic instructions in the memory 830 to perform the following method: acquiring a first temperature of an air outlet before cleaning and a second temperature of the air outlet after cleaning; if the absolute value of the difference value between the first temperature and the second temperature is larger than a preset temperature threshold value, the cleanness degree of the heat exchanger is confirmed to reach the standard; and if the absolute value of the difference value of the first temperature and the second temperature is larger than a preset temperature threshold value, cleaning the heat exchanger again until the cleaning degree of the heat exchanger reaches the standard and/or a cleaning stopping instruction is received.
In addition, the logic instructions in the memory 830 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of 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 another aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is implemented to perform the transmission method provided in the foregoing embodiments when executed by a processor, and for example, the method includes: acquiring a first temperature of an air outlet before cleaning and a second temperature of the air outlet after cleaning; if the absolute value of the difference value between the first temperature and the second temperature is larger than a preset temperature threshold value, the cleanness degree of the heat exchanger is confirmed to reach the standard; and if the absolute value of the difference value of the first temperature and the second temperature is larger than a preset temperature threshold value, cleaning the heat exchanger again until the cleaning degree of the heat exchanger reaches the standard and/or a cleaning stopping instruction is received.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for determining the degree of cleanliness of a heat exchanger, comprising:
acquiring a first temperature of an air outlet before cleaning and a second temperature of the air outlet after cleaning;
if the absolute value of the difference value between the first temperature and the second temperature is larger than a preset temperature threshold value, the cleanness degree of the heat exchanger is confirmed to reach the standard;
and if the absolute value of the difference value of the first temperature and the second temperature is larger than a preset temperature threshold value, cleaning the heat exchanger again until the cleaning degree of the heat exchanger reaches the standard and/or a cleaning stopping instruction is received.
2. The method as claimed in claim 1, wherein the obtaining the first temperature of the outlet before cleaning and the second temperature of the outlet after cleaning comprises:
under the conditions of a preset operation environment and preset operation parameters, a first temperature of the air outlet before cleaning and a second temperature of the air outlet after cleaning are obtained.
3. The method of claim 1, wherein the obtaining a first temperature of the pre-cleaned outlet and a second temperature of the post-cleaned outlet further comprises:
when the heat exchanger runs to a detection time interval, acquiring a first temperature of the air outlet before cleaning and a second temperature of the air outlet after cleaning.
4. The method of claim 1, wherein the obtaining a first temperature of the pre-cleaned outlet and a second temperature of the post-cleaned outlet further comprises:
the method comprises the steps of obtaining a first temperature of an air outlet before cleaning and a second temperature of the air outlet after cleaning under the condition that the temperature of the air outlet is monitored to be continuously stable at a certain temperature for a preset duration.
5. The method of claim 1, wherein the determining that the cleanliness of the heat exchanger is satisfactory if the absolute value of the difference between the first temperature and the second temperature is greater than a predetermined temperature threshold value comprises:
under the condition that the heat exchanger is in a refrigeration mode, if the absolute value of the first temperature and the absolute value of the second temperature are larger than a preset refrigeration temperature threshold value, the cleanliness of the heat exchanger is confirmed to reach the standard;
and under the condition that the heat exchanger is in a heating mode, if the absolute value of the first temperature and the absolute value of the second temperature are greater than a preset heating stability threshold value, the cleanness degree of the heat exchanger is confirmed to reach the standard.
6. The determination method according to claim 1, further comprising:
and when the cleanliness degree of the heat exchanger is judged, sending a corresponding judgment result to an intelligent terminal bound with the heat exchanger, wherein the intelligent terminal can send an instruction for controlling the heat exchanger.
7. A device for determining the degree of cleanliness of a heat exchanger, comprising:
the acquiring module is used for acquiring a first temperature of the air outlet before cleaning and a second temperature of the air outlet after cleaning;
the judging module is used for confirming that the cleanliness degree of the heat exchanger reaches the standard if the absolute value of the difference value of the first temperature and the second temperature is larger than a preset temperature threshold;
and the judging module is further used for cleaning the heat exchanger again if the absolute value of the difference value of the first temperature and the second temperature is larger than a preset temperature threshold value until the cleaning degree of the heat exchanger reaches the standard and/or a cleaning stopping instruction is received.
8. The determination device according to claim 7, wherein: the acquisition module and the judgment module are controlled to execute the judgment method of any one of claims 1 to 6.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the method of determining as claimed in any one of claims 1 to 6 are implemented when the program is executed by the processor.
10. A non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the determination method according to any one of claims 1 to 6.
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| CN202011243172.3A CN112460733A (en) | 2020-11-09 | 2020-11-09 | Method and device for cleaning degree of heat exchanger |
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| CN202011243172.3A CN112460733A (en) | 2020-11-09 | 2020-11-09 | Method and device for cleaning degree of heat exchanger |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113091319A (en) * | 2021-04-01 | 2021-07-09 | 青岛海尔空调器有限总公司 | Anti-blocking detection method and device for fan heater and fan heater |
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Application publication date: 20210309 |