CN108954720B - filter screen failure judgment method, filter screen failure judgment system and unit equipment - Google Patents
filter screen failure judgment method, filter screen failure judgment system and unit equipment Download PDFInfo
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- CN108954720B CN108954720B CN201810918742.0A CN201810918742A CN108954720B CN 108954720 B CN108954720 B CN 108954720B CN 201810918742 A CN201810918742 A CN 201810918742A CN 108954720 B CN108954720 B CN 108954720B
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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
- 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
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/39—Monitoring filter performance
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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
- F24F11/89—Arrangement or mounting of control or safety devices
-
- 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
-
- 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
- F24F2110/50—Air quality properties
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
- Testing And Monitoring For Control Systems (AREA)
Abstract
The invention discloses a filter screen failure judgment method, a filter screen failure judgment system and unit equipment, wherein the method comprises the following steps: detecting input parameter values and working conditions of the motor; determining a preset parameter threshold corresponding to the working condition according to the working condition; and comparing the input parameter value with a preset parameter threshold value, and determining whether the filter screen is invalid or not according to a comparison result. That is to say, the invention can judge whether the filter screen is invalid or not by only detecting the input parameter value of the motor and comparing the input parameter value with the preset parameter threshold value, the invention is not influenced by the using environment and conditions, the processing method is simple, and the stability and the accuracy for judging the filter screen is higher, thereby effectively solving the problem that the operation for judging the filter screen by the existing air purifier is complicated.
Description
Technical Field
the invention relates to the technical field of units, in particular to a filter screen failure judgment method, a filter screen failure judgment system and unit equipment.
background
at present, the second industry still occupies a large proportion in the industrial structure of China, pollutants such as waste water, waste gas and waste materials generated by the second industry additionally form a serious challenge to the ecological environment, on the other hand, the pursuit of people for high quality living standard is continuously improved, the desire for breathing clean air is more and more strong, the air quality condition becomes a hot spot problem pursued by the whole people, and various air purifier products appear in the market to meet the requirements of users.
The existing air purifier basically adopts a logic preprocessing mode, namely, local air quality and filter screen properties are evaluated in advance, filter screen failure rules are simulated and written into a logic program, and a user is automatically reminded to replace the filter screen after the filter screen is used for a set time.
The problem of the air purifier among the prior art judges the operation of filter screen is complicated, has not proposed effectual solution at present.
disclosure of Invention
The embodiment of the invention provides a filter screen failure judgment method, a filter screen failure judgment system and unit equipment, and aims to solve the problem that the operation of judging a filter screen by an air purifier is complicated in the prior art.
In order to solve the technical problem, the invention provides a method for judging failure of a filter screen on one hand, which comprises the following steps: detecting input parameter values and working conditions of the motor; determining a preset parameter threshold corresponding to the working condition according to the working condition; and comparing the input parameter value with a preset parameter threshold value, and determining whether the filter screen is invalid or not according to a comparison result.
Optionally, before detecting the input parameter value and the operating condition of the motor, the method further includes: setting a preset parameter threshold corresponding to different working conditions according to the different working conditions; wherein the operating conditions include one or more of: ambient temperature, clean air quantity CADR, air quantity.
optionally, setting a preset parameter threshold corresponding to the different working condition conditions includes: and detecting an input parameter value corresponding to the air quantity when the CADR of the filter screen is smaller than a preset CADR value at different temperatures, and taking the input parameter value as a preset parameter threshold value at the temperature.
Optionally, the preset CADR value is an initial CADR value x 50%.
optionally, comparing the input parameter value with a preset parameter threshold, and determining whether the filter screen is invalid according to a comparison result, including: if the input parameter value is larger than or equal to the preset parameter threshold value and the preset variable, determining that the filter screen is invalid; and if the input parameter value is less than the preset parameter threshold value and the preset variable, determining that the filter screen is not invalid.
optionally, the method further comprises: and after determining that the filter screen is invalid, alarming and reminding.
Optionally, the input parameter value is an input current value.
in another aspect, the present invention provides a system for determining a failure of a filter, the system comprising:
the filter screen system is connected with the fan system and is used for filtering air flowing through;
the fan system is connected with the master control system and is used for enabling air to flow to the filter screen system through the motor and sending input parameter values of the motor to the master control system;
And the main control system is used for determining a preset parameter threshold corresponding to the working condition according to the working condition, comparing the input parameter value with the preset parameter threshold, and determining whether the filter screen fails according to the comparison result.
optionally, the screen system comprises at least one or more of: primary effect filter screen, medium effect filter screen, coarse effect filter screen.
Optionally, the fan system comprises: motor, fan blade subassembly and wind channel.
Optionally, the master control system includes:
The receiving device is used for receiving the input parameter values and the working condition;
the control device is used for determining a preset parameter threshold corresponding to the working condition according to the working condition, comparing the input parameter value with the preset parameter threshold, and determining whether the filter screen fails according to a comparison result;
And the alarm device is used for executing alarm reminding operation after determining that the filter screen is invalid.
Optionally, the control device is further configured to set a preset parameter threshold corresponding to the operating condition according to different operating conditions; wherein the operating conditions include one or more of: ambient temperature, clean air quantity CADR and air quantity.
optionally, the control device is further configured to detect an input parameter value corresponding to the air volume when the CADR of the filter screen is smaller than a preset CADR value at different temperatures, and use the input parameter value as a preset parameter threshold at the temperature.
optionally, the control device is further configured to determine that the filter screen is invalid if the input parameter value is greater than or equal to the preset parameter threshold value plus a preset variable; and if the input parameter value is less than the preset parameter threshold value and the preset variable, determining that the filter screen is not invalid.
The invention further provides unit equipment which comprises any one of the filter screen failure judging systems.
By applying the technical scheme of the invention, whether the filter screen is invalid or not can be judged only by detecting the input parameter value of the motor and comparing the input parameter value with the preset parameter threshold value.
drawings
FIG. 1 is a schematic flow chart illustrating a method for determining a failure of a filter according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a system for determining a failure of a filter according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating another method for determining a screen failure according to an embodiment of the present disclosure;
Fig. 4 is a schematic structural diagram of another screen failure determination system according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific embodiments, it being understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention.
Fig. 1 is a method for determining a filter screen failure according to an embodiment of the present invention, as shown in fig. 1, the method includes:
s101, detecting input parameter values and working conditions of a motor;
s102, determining a preset parameter threshold corresponding to the working condition according to the working condition;
S103, comparing the input parameter value with a preset parameter threshold value, and determining whether the filter screen is invalid or not according to a comparison result.
That is to say, the embodiment of the invention can judge whether the filter screen is invalid or not by comparing the input parameter value of the motor with the preset parameter threshold value, the invention is not influenced by the use environment and the use condition, the processing method is simple, and the stability and the accuracy for judging the filter screen is higher, thereby effectively solving the problem that the operation for judging the filter screen by the existing air purifier is complicated.
In the embodiment of the present invention, before detecting an input parameter value and a working condition of the motor, the method further includes: setting a preset parameter threshold corresponding to different working conditions according to the different working conditions; wherein the operating conditions include one or more of: ambient temperature, Clean Air Delivery Rate (CADR), and Air volume.
Specifically, the embodiment of the invention detects the input parameter value corresponding to the air volume when the CADR of the filter screen is smaller than the preset CADR value at different temperatures, and takes the input parameter value as the preset parameter threshold value at the temperature.
that is, in the embodiment of the present invention, an input parameter value of a motor corresponding to an air volume when a CADR of a filter screen is smaller than a preset CADR value is simulated in advance, the input parameter value is used as a preset parameter threshold at the temperature, and a series of preset parameter thresholds corresponding to the temperature are obtained through a plurality of tests and stored for subsequent determination of whether the filter screen is failed or not at different temperatures, which is specifically shown in table 1.
TABLE 1 corresponding relationship table of air quantity, temperature and input quantity signal threshold of the present invention
In specific implementation, in the embodiment of the present invention, the preset CADR value is set to be an initial CADR value × 50%. The filter screen filth blockage test of the embodiment of the invention executes GB/T18801-.
It should be noted that the motor according to the embodiment of the present invention is a constant-air-volume direct current motor, and the input parameter value of the motor according to the embodiment of the present invention is the input current of the constant-air-volume direct current motor, and whether the filter screen fails is determined by comparing the input current with a preset input current threshold value when the filter screen fails. Certainly, in specific implementation, a person skilled in the art can also determine whether the filter screen fails according to actual needs by using the input voltage of the constant-air-volume direct current motor, and the specific principle is similar to the input current principle, which is not described in detail herein.
The working principle of the embodiment of the invention is that when the filter screen system is dirty and blocked, the static pressure value of the air channel in the fan system is increased, the rotating speed of the constant-air-volume direct-current motor in the fan system is increased to keep the constant air volume, and the input current of the constant-air-volume direct-current motor in the fan system is increased, namely, the rotating speed and the input current of the constant-air-volume direct-current motor in the fan system are in one-to-one correspondence at the same temperature.
the master control system of the embodiment of the invention prestores the input current values of the constant-air-volume direct current motor in the fan system when the filter screen system fails under different constant air volumes and different environmental temperatures. When a certain section is used for judging that the input current of the constant air volume direct current motor is higher than the input current of the constant air volume direct current motor when the filter screen system fails, namely, the actually detected static pressure value is higher than the static pressure of the air duct when the filter screen system is dirty and blocked, the filter screen failure is judged.
Generally speaking, the core of the embodiment of the invention is to compare the input current value of the constant-air-volume direct current motor with a preset parameter threshold value so as to judge whether the filter screen is invalid or not.
In the embodiment of the present invention, comparing the input parameter value with a preset parameter threshold value, and determining whether the filter screen is failed according to the comparison result, includes: if the input parameter value is larger than or equal to the preset parameter threshold value and the preset variable, determining that the filter screen is invalid; and if the input parameter value is less than the preset parameter threshold value and the preset variable, determining that the filter screen is not invalid.
That is to say, the embodiment of the invention sets the preset variable for the preset parameter threshold value, thereby realizing more accurate judgment of whether the filter screen is invalid.
In specific implementation, after determining that the filter screen is invalid, the embodiment of the invention executes alarm reminding operation to remind a user that the filter screen is invalid.
The alarm unit of the embodiment of the invention can display the filth blockage fault of the filter screen or remind a user to replace the filter screen in any other form.
compared with the prior art that whether the filter screen fails or not needs to be judged according to the air quality conditions of different regions, and the failure of the filter screen is evaluated and judged through high-cost third-party detection instruments such as a dust sensor, a differential pressure sensor and the like, the method is simple to operate and low in development cost, and in addition, the judgment method is accurate and can be suitable for various scenes such as families, units and the like.
fig. 2 is a schematic structural diagram of a filter screen failure determination system according to an embodiment of the present invention, and as shown in fig. 2, the filter screen failure determination system according to the embodiment of the present invention includes: the filter screen system is connected with the fan system and is used for filtering pollutants in the air flowing through; the fan system is connected with the main control system and used for providing power to enable air to flow to the filter screen system; and the master control system is used for judging whether the filter screen in the filter screen system fails or not.
the filter screen system provided by the embodiment of the invention at least comprises one or more of the following components: the filter screen is imitated to the primary, well effect filter screen and coarse filter screen, and concrete technical personnel in this field can carry out arbitrary setting as required. The fan system of the embodiment of the invention comprises: motor, fan blade subassembly and wind channel.
The filter screen system is connected with the fan system, the main control system is connected with the fan system, the filter screen system is used for filtering pollutants such as particles, formaldehyde and the like in air, the fan system is used for providing power to enable air to flow and comprises a constant-air-volume direct current motor, a fan blade assembly, an air channel and the like, and the main control system comprises a receiving part, a control part and an alarm part.
The receiving unit in the main control system is used for receiving the input quantity signal of the constant-air-quantity direct-current motor in the fan system and the ambient temperature detection value, and the receiving unit is any transmission medium capable of receiving electric parameters, temperature signals, pressure values and the like, such as a lead, infrared rays and the like.
The air treatment system provided by the embodiment of the invention can be applied to various air purification systems such as an air conditioner, an air purifier and the like.
fig. 3 is a schematic flow chart of a method for determining a filter screen failure according to an embodiment of the present invention, and as shown in fig. 3, the method for determining a filter screen failure according to an embodiment of the present invention includes:
firstly, testing the input current I of a constant-air-volume direct current motor in the fan system when the filter screen system failsiiThe input current Iiiis an important basis for judging the failure of the filter screen subsequently;
GB/T18801-.
The embodiment of the invention ensures the accuracy of judgment, so that margin is providedTo improve the reliability of the determination.
Detecting the input current value of the constant-air-volume direct current motor when the filter screen system fails under different constant-air-volume values and different environmental temperatures according to the standard, and pre-storing the input current value into a master control system;
Secondly, to ensure correct installation of the units (includingthe filter screen system, the fan system and the master control system can work normally), the receiving part in the master control system receives the detection value t of the ambient temperatureiAnd fed back to the control part, the control part selects the category A according to the environment temperatureiThe receiving part receives the input current I of the constant-air-volume direct current motor in the fan system in real time and feeds the input current I back to the control part, and the control part in the master control system judges whether the real-time current I is not less than the failure current I or notii+ marginIf the filter screen system is judged to be invalid, an alarm part in the main control system reminds a user to replace the filter screen in a certain mode, and if not, the unit normally runs until the filter screen system is invalid.
corresponding to fig. 1, an embodiment of the present invention further provides a system for determining a filter screen failure, specifically as shown in fig. 4, where the system includes:
The filter screen system is connected with the fan system and is used for filtering air flowing through;
the fan system is connected with the master control system and is used for enabling air to flow to the filter screen system through the motor and sending input parameter values of the motor to the master control system;
and the main control system is used for determining a preset parameter threshold corresponding to the working condition according to the working condition, comparing the input parameter value with the preset parameter threshold, and determining whether the filter screen fails according to the comparison result.
That is to say, the master control system of the embodiment of the invention can judge whether the filter screen is invalid or not by comparing the input parameter value of the motor with the preset parameter threshold value, the invention is not influenced by the use environment and conditions, the processing method is simple, and the stability and accuracy for judging the filter screen is higher, thereby effectively solving the problem that the operation for judging the filter screen by the existing air purifier is complicated.
It should be noted that, the screen system according to the embodiment of the present invention at least includes one or more of the following: primary effect filter screen, medium effect filter screen and coarse effect filter screen. The fan system includes: motor, fan blade subassembly and wind channel.
In an embodiment of the present invention, the master control system includes:
The receiving device is used for receiving the input parameter values and the working conditions of the motor sent by the fan system;
The control device is used for determining a preset parameter threshold corresponding to the working condition according to the working condition, comparing the input parameter value with the preset parameter threshold, and determining whether the filter screen fails according to a comparison result;
And the alarm device is used for executing alarm reminding operation after determining that the filter screen is invalid.
In the embodiment of the invention, the control device is further configured to set a preset parameter threshold corresponding to the working condition according to different working conditions; wherein the operating conditions include one or more of: ambient temperature, clean air quantity CADR, air quantity.
In specific implementation, the control device according to the embodiment of the present invention detects an input parameter value corresponding to an air volume when the CADR of the filter screen is smaller than a preset CADR value at different temperatures, and uses the input parameter value as a preset parameter threshold at the temperature.
The embodiment of the invention is characterized in that a control device detects an input parameter value corresponding to the air volume when the CADR of the filter screen is smaller than a preset CADR value at different temperatures, and the input parameter value is used as a preset parameter threshold value at the temperature.
That is to say, the control device according to the embodiment of the present invention simulates an input parameter value of the motor corresponding to the air volume when the CADR of the filter screen is smaller than the preset CADR value in advance, and uses the input parameter value as the preset parameter threshold value at the temperature, and obtains a series of preset parameter threshold values corresponding to the temperature through a plurality of tests, and stores the preset parameter threshold values for subsequent determination of whether the filter screen is failed or not at different temperatures, as specifically shown in table 1.
TABLE 1 corresponding relationship table of air quantity, temperature and input quantity signal threshold of the present invention
In specific implementation, in the embodiment of the present invention, the preset CADR value is set to be an initial CADR value × 50%. The filter screen filth blockage test of the embodiment of the invention executes GB/T18801-.
As a preferred embodiment of the present invention, the control device determines, by determining, that the filter screen is invalid if the input parameter value is greater than or equal to the preset parameter threshold value plus a preset variable; and if the input parameter value is less than the preset parameter threshold value and the preset variable, determining that the filter screen is not invalid.
That is to say, the embodiment of the invention sets the preset variable for the preset parameter threshold value, thereby realizing more accurate judgment of whether the filter screen is invalid.
Compared with the prior art that whether the filter screen fails or not needs to be judged according to the air quality conditions of different regions, and the failure of the filter screen is evaluated and judged through high-cost third-party detection instruments such as a dust sensor, a differential pressure sensor and the like, the method is simple to operate and low in development cost, and in addition, the judgment method is accurate and can be suitable for various scenes such as families, units and the like.
The related content of the embodiment of the invention can be understood by referring to the embodiment part of the filter screen failure judgment method, and the invention is not described in detail herein.
The embodiment of the present invention further provides a unit device, where the unit device includes any one of the filter screen failure determination systems in the embodiments of the present invention, and may be understood by referring to relevant parts of the embodiments of the filter screen failure determination system and the embodiments of the filter screen failure determination method, which are not described in detail herein.
As is apparent from the above description, the effects achieved by the present invention are as follows: the invention only uses the input quantity of the constant-air-quantity direct-current fan as the basis for judging whether the filter screen is invalid or not, has simple processing method, is not influenced by the using environment and conditions of the air purifier, and has higher stability and accuracy for judging the filter screen is invalid. Compared with the prior art that whether the filter screen fails or not needs to be judged according to the air quality conditions of different areas, and the failure of the filter screen is evaluated and judged through high-cost third-party detecting instruments such as a dust sensor, a differential pressure sensor and the like, the method is simple to operate and low in development cost, and in addition, the judging method is accurate and can be suitable for various scenes such as families, units and the like.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a mobile terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments illustrated in the drawings, the present invention is not limited to the embodiments, which are illustrative rather than restrictive, and it will be apparent to those skilled in the art that many more modifications and variations can be made without departing from the spirit of the invention and the scope of the appended claims.
Claims (11)
1. a method for judging failure of a filter screen is characterized by comprising the following steps:
Setting a preset parameter threshold corresponding to different working conditions according to the different working conditions; wherein the operating conditions include one or more of: ambient temperature, clean air quantity CADR, air quantity; the method specifically comprises the following steps: detecting an input parameter value corresponding to the air volume when the CADR of the filter screen is smaller than a preset CADR value at different temperatures, and taking the input parameter value as a preset parameter threshold value at the temperature;
Detecting input parameter values and working conditions of the motor;
Determining a preset parameter threshold corresponding to the working condition according to the working condition;
and comparing the input parameter value with a preset parameter threshold value, and determining whether the filter screen is invalid or not according to a comparison result.
2. The method of claim 1,
The preset CADR value is the initial CADR value multiplied by 50%.
3. The method of claim 1, wherein comparing the input parameter value with a preset parameter threshold and determining whether the filter screen is failed according to the comparison result comprises:
If the input parameter value is larger than or equal to the preset parameter threshold value and the preset variable, determining that the filter screen is invalid;
And if the input parameter value is less than the preset parameter threshold value and the preset variable, determining that the filter screen is not invalid.
4. the method of claim 1, further comprising:
And executing alarm reminding operation after determining that the filter screen is invalid.
5. the method according to any one of claims 1 to 4,
The input parameter value is an input current value.
6. a system for determining filter screen failure, the system comprising:
The filter screen system is connected with the fan system and is used for filtering air flowing through;
The fan system is connected with the master control system and is used for enabling air to flow to the filter screen system through the motor and sending input parameter values of the motor to the master control system;
The main control system is used for determining a preset parameter threshold corresponding to the working condition according to the working condition, comparing the input parameter value with the preset parameter threshold, and determining whether the filter screen is invalid or not according to the comparison result;
the control device is used for setting preset parameter thresholds corresponding to different working conditions; wherein the operating conditions include one or more of: ambient temperature, clean air quantity CADR and air quantity;
and the control device is also used for detecting an input parameter value corresponding to the air quantity when the CADR of the filter screen is smaller than a preset CADR value at different temperatures, and taking the input parameter value as a preset parameter threshold value at the temperature.
7. The system of claim 6,
The screen system includes at least one or more of: primary effect filter screen, medium effect filter screen, coarse effect filter screen.
8. The system of claim 6,
The fan system includes: motor, fan blade subassembly and wind channel.
9. The system of claim 6,
The master control system comprises:
The receiving device is used for receiving the input parameter values and the working condition;
the control device is used for determining a preset parameter threshold corresponding to the working condition according to the working condition, comparing the input parameter value with the preset parameter threshold, and determining whether the filter screen fails according to a comparison result;
And the alarm device is used for executing alarm reminding operation after determining that the filter screen is invalid.
10. The system of claim 9,
The control device is also used for determining that the filter screen is invalid if the input parameter value is greater than or equal to the preset parameter threshold value and a preset variable; and if the input parameter value is less than the preset parameter threshold value and the preset variable, determining that the filter screen is not invalid.
11. An assembly comprising a screen failure determination system according to any one of claims 6 to 10.
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| CN110925822B (en) * | 2019-11-04 | 2021-08-20 | 宁波方太厨具有限公司 | Filter element installation detection prompting method of central purification system |
| CN114306968B (en) * | 2021-12-15 | 2023-10-27 | 安丹达工业技术(上海)有限公司 | Power air supply air filtering respirator and control method thereof |
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| CN106382709B (en) * | 2016-08-26 | 2019-04-09 | 珠海格力电器股份有限公司 | The dirty stifled detection method of filter screen of air conditioner and system and air conditioner |
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