CN110529970B - Static pressure adjusting method and alternating-current variable-frequency air duct machine - Google Patents
Static pressure adjusting method and alternating-current variable-frequency air duct machine Download PDFInfo
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F11/62—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
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/28—Arrangement or mounting of filters
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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
- F24F2110/40—Pressure, e.g. wind pressure
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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Abstract
The invention provides a static pressure adjusting method and an alternating-current variable-frequency air duct machine, and relates to the technical field of air conditioners. The static pressure adjusting method is applied to an alternating-current variable-frequency air duct machine and comprises the following steps: obtaining a design static pressure value P1 of the alternating-current variable-frequency air pipe machine; acquiring an actual static pressure value P2 of the alternating-current variable-frequency air duct machine; determining a static pressure error value delta P of the alternating-current variable-frequency air duct machine according to the design static pressure value P1 and the actual static pressure value P2; and determining the quantity value N of the filter screens to be additionally arranged according to the static pressure error value delta P and the resistance value P3 of the filter screens, wherein the N filter screens are used for being additionally arranged at the air outlet of the alternating-current variable-frequency air duct machine. The static pressure adjusting method can accurately increase the quantity value N of the filter screen, increase the actual static pressure value of the alternating-current variable-frequency air pipe machine by means of the resistance value brought by the filter screen, make up the error between the actual static pressure value and the designed static pressure value, enable the motor to operate within the rated rotating speed range, avoid electrode burning, and improve the reliability and comfort of the alternating-current variable-frequency air pipe machine.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a static pressure adjusting method and an alternating-current variable-frequency air duct machine.
Background
The market share of the central air conditioner is improved year by year, and the application of air duct machine products is more and more extensive, and basically, the air duct machine products are provided with a static pressure machine set and need to be provided with air ducts and the like. In actual engineering installation, the actual static pressure value of the unit generally deviates from the design value due to the limitation of factors such as installation position, air duct length and pipe diameter.
For the alternating-current variable-frequency air duct machine, the adjustable range of the rotating speed of the alternating-current motor is small, and the static pressure value is designed to be a fixed value. If the actual static pressure value is too small after the installation is finished, the motor runs at a speed far higher than the rated speed for a long time, and the motor is burnt.
Disclosure of Invention
The problem to be solved by the invention is that the actual static pressure value of the alternating-current variable-frequency air duct machine is too small.
In order to solve the above problems, the present invention provides a static pressure adjusting method, which is applied to an ac frequency conversion duct machine, and comprises:
obtaining a design static pressure value P1 of the alternating-current variable-frequency air pipe machine;
acquiring an actual static pressure value P2 of the alternating-current variable-frequency air pipe machine;
determining a static pressure error value delta P of the alternating-current variable-frequency air duct machine according to the design static pressure value P1 and the actual static pressure value P2;
and determining the quantity value N of the filter screens to be additionally arranged according to the static pressure error value delta P and the resistance value P3 of the filter screens, wherein N filter screens are used for being additionally arranged at the air outlet of the alternating-current variable-frequency air duct machine.
Therefore, the static pressure error value delta P of the alternating-current variable-frequency air duct machine can be accurately determined, the quantity value N of the filter screens needing to be additionally arranged is determined according to the static pressure error value delta P and the resistance value P3 of the filter screens, N filter screens are additionally arranged at the air outlet of the alternating-current variable-frequency air duct machine, the actual static pressure value of the alternating-current variable-frequency air duct machine can be increased by means of the resistance value brought by the filter screens, the error between the actual static pressure value and the designed static pressure value is made up to the maximum extent, the actual static pressure value of the alternating-current variable-frequency air duct machine is matched with the designed static pressure value at the rated rotating speed, the motor can run in the range of the rated rotating speed, electrode burn. In addition, the air purification ability of exchanging frequency conversion tuber pipe machine can also be improved to add the filter screen.
Further, the step of determining the static pressure error value Δ P of the ac variable frequency duct machine according to the design static pressure value P1 and the actual static pressure value P2 includes:
and calculating the difference value between the design static pressure value P1 and the actual static pressure value P2, wherein the difference value is the static pressure error value delta P.
Therefore, the static pressure error value delta P of the alternating-current variable-frequency air duct machine can be accurately determined, and a foundation is created for making up the static pressure error value delta P.
Further, the step of determining the number value N of the filter screens to be added according to the static pressure error value Δ P and the resistance value P3 of the filter screens includes:
and calculating a result value of dividing the static pressure error value delta P by the resistance value P3 of the filter screen, wherein the result value is the quantity value N.
Therefore, the quantity value N of the filter screen which needs to be additionally arranged can be accurately determined, and the error between the actual static pressure value and the designed static pressure value is made up to the maximum extent.
Further, the step of obtaining the actual static pressure value P2 of the ac variable frequency duct machine includes:
counting a reference data table, wherein the reference data table comprises a corresponding relation among an air outlet static pressure value P4 of an air volume box, a current value I of a motor in an air supply mode and a coil temperature t of an evaporator in a refrigeration mode;
and determining the corresponding outlet static pressure value P4 as the actual static pressure value P2 according to the corresponding relation among the actual current value Is of the motor in the air supply mode, the actual coil temperature ts of the evaporator in the refrigeration mode and the reference data table in the actual work of the alternating-current variable-frequency air duct machine.
Further, the step of statistically referencing a data table includes:
controlling the alternating-current variable-frequency air duct machine to operate for a first preset time in an air supply mode;
and recording the static air outlet pressure value P4 of the air volume box and the current value I of the motor in the air supply mode.
Further, the range of the first preset time is 0.5min to 1.5 min.
Further, the step of statistically referencing a data table includes:
controlling the alternating-current variable-frequency air pipe machine to run for a second preset time in a refrigeration mode;
and recording the outlet static pressure value P4 of the air volume box and the coil temperature t of the evaporator in the refrigeration mode.
Further, the second preset duration ranges from 0.5min to 1.5 min.
In order to solve the above problems, the present invention further provides an ac frequency conversion duct machine, including N additional filter screens, where the filter screens are installed at the air outlet, where N is determined according to a static pressure error value Δ P and a resistance value P3 of the filter screen; the static pressure error value Δ P is determined based on a design static pressure value P1 and an actual static pressure value P2.
Therefore, the error between the actual static pressure value and the designed static pressure value of the AC variable-frequency air duct machine is small, the actual static pressure value of the AC variable-frequency air duct machine is matched with the designed static pressure value at the rated rotating speed, the motor can run in the range of the rated rotating speed, electrodes are prevented from being burnt, and the reliability and the comfort of the AC variable-frequency air duct machine are improved. In addition, the air purification ability of exchanging frequency conversion tuber pipe machine can also be improved to add the filter screen.
Drawings
Fig. 1 is a flow chart of a method of static pressure regulation according to an embodiment of the present invention.
Fig. 2 is a detailed flowchart of S2 in fig. 1.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Before the ac frequency conversion duct type air conditioner leaves a factory, a designed static pressure value is determined, but in actual engineering installation, the design is limited by factors such as installation position, air duct length and pipe diameter, when the ac frequency conversion duct type air conditioner is installed and used, an error exists between an actual static pressure value and the designed static pressure value, for example, if the actual static pressure value is smaller than the designed static pressure value, a motor runs at a speed far higher than a rated speed for a long time, and the motor burns out.
The motor of the alternating-current variable-frequency air duct machine needs to operate near a rated rotating speed. If the actual static pressure value is larger, the air supply amount is smaller, because the larger the actual static pressure value is, the larger the resistance value of the air pipe is, the air supply amount is reduced, and the higher the rotating speed of the motor is, the larger the current value of the motor in the air supply mode is, and the lower the temperature of the coil of the evaporator in the refrigeration mode is. According to the corresponding relation among the actual static pressure value, the current value of the motor in the air supply mode and the coil temperature of the evaporator in the refrigeration mode, the corresponding actual static pressure value can be determined according to the current value of the motor in the air supply mode and the coil temperature of the evaporator in the refrigeration mode.
The present embodiment provides a method for static pressure adjustment of an ac frequency conversion duct machine, which applies the above method for determining an actual static pressure value, please refer to fig. 1, and includes the following steps:
and S1, obtaining the design static pressure value P1 of the AC variable frequency air duct machine.
The designed static pressure value P1 is a parameter which is determined before the AC variable frequency duct type air conditioner leaves a factory, and can be found from a comparison table of the rotating speed and the static pressure of the AC variable frequency duct type air conditioner under different wind gears.
S2, please refer to fig. 2, obtain the actual static pressure P2 of the ac frequency conversion duct type air conditioner. S2 specifically includes S21 and S22, specifically as follows.
S21, statistics reference data table.
The reference data table comprises a corresponding relation among an air outlet static pressure value P4 of the air volume box, a current value I of the motor in an air supply mode and a coil temperature t of the evaporator in a refrigeration mode.
The specific process of counting the reference data table is as follows:
firstly, the alternating-current variable-frequency air duct machine is controlled to run for a first preset time length in an air supply mode. Wherein the first preset duration is in the range of 0.5min to 1.5min, preferably 1 min. Therefore, the alternating-current variable-frequency air duct machine can operate stably, and subsequent parameters can be acquired accurately.
And secondly, recording an air outlet static pressure value P4 of the air volume box and a current value I of the motor in the air supply mode. In the blowing mode, the current value I of the motor is only related to the motor and further related to the actual static pressure value P2, so that the current value I of the motor in the blowing mode can directly reflect the change of the actual static pressure value P2.
And then, controlling the alternating-current variable-frequency air pipe machine to run for a second preset time length in the refrigeration mode. Wherein the second preset duration is in the range of 0.5min to 1.5min, preferably 1 min. Therefore, the alternating-current variable-frequency air duct machine can operate stably, and subsequent parameters can be acquired accurately.
And finally, recording the outlet static pressure value P4 of the air volume box and the coil temperature t of the evaporator in the refrigeration mode. In the refrigeration mode, the coil temperature t of the evaporator can directly reflect the change of the actual static pressure value P2.
The recording of the current value I of the motor in the air supply mode and the recording of the temperature t of the coil of the evaporator in the refrigeration mode are not in sequence, and the time sequence is not limited.
After recording the air outlet static pressure value P4 of the air volume box, the current value I of the motor in the air supply mode and the coil temperature t of the evaporator in the refrigeration mode, filling the reference data table with the recorded data, and completing statistics of the reference data table, as shown in the following table:
in this embodiment, the actual static pressure value P2 is determined according to the current value I of the motor in the air supply mode and the coil temperature t of the evaporator in the cooling mode, and the result is more accurate than the result obtained by determining the actual static pressure value P2 according to a single parameter.
And S22, determining a corresponding outlet static pressure value P4 as an actual static pressure value P2 according to the corresponding relation among an actual current value Is of the motor in an air supply mode, an actual coil temperature ts of the evaporator in a refrigeration mode and a reference data table in the actual work of the AC variable frequency air duct machine.
For example, in the actual operation of the ac variable frequency duct machine, if the measured actual current value Is of the motor in the blowing mode and the measured actual coil temperature ts of the evaporator in the cooling mode are close to I10 and t10 in the reference data table, respectively, it Is determined that the corresponding outlet static pressure value P4 Is 0Pa, and the actual static pressure value P2 Is 0 Pa. And if the measured actual current value Is of the motor in the air supply mode and the measured actual coil temperature ts of the evaporator in the refrigeration mode are close to I20 and t20 in the reference data table respectively, determining that the corresponding outlet static pressure value P4 Is 10Pa, and the actual static pressure value P2 Is 10 Pa.
And S3, determining a static pressure error value delta P of the AC variable frequency air duct machine according to the design static pressure value P1 and the actual static pressure value P2.
Specifically, the difference between the design static pressure value P1 and the actual static pressure value P2 is calculated, and the difference is the static pressure error value Δ P, i.e., Δ P is P1-P2.
And S4, determining the quantity value N of the filter screens to be additionally arranged according to the static pressure error value delta P and the resistance value P3 of the filter screens, wherein N filter screens are additionally arranged at the air outlet of the alternating-current variable-frequency air duct machine.
Specifically, the static pressure error value Δ P is divided by the resistance value P3 of the filter screen, and the result is a numerical value N, i.e., N is Δ P/P3. Where N is a non-integer, it can be rounded up by, for example, calculating N to be 3.5, and then N is equal to 4.
The present embodiment further provides an ac variable frequency duct machine, where the ac variable frequency duct machine includes N additional filter screens, and the filter screens are installed at the air outlet, where the method for determining N refers to the above static pressure adjustment method.
The method for adjusting the static pressure and the alternating-current variable-frequency air duct machine provided by the embodiment have the beneficial effects that:
1. the static pressure error value delta P of the alternating-current variable-frequency air duct machine can be accurately determined, then the numerical value N of the filter screens needing to be additionally arranged is determined according to the static pressure error value delta P and the resistance value P3 of the filter screens, the N filter screens are additionally arranged at the air outlet of the alternating-current variable-frequency air duct machine, the actual static pressure value of the alternating-current variable-frequency air duct machine can be increased by means of the resistance value brought by the filter screens, the error between the actual static pressure value and the designed static pressure value is made up to the maximum extent, the actual static pressure value of the alternating-current variable-frequency air duct machine is matched with the designed static pressure value at the rated rotating speed, the motor can run in the range of;
2. the air purification ability of exchanging frequency conversion tuber pipe machine can also be improved to add the filter screen.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A static pressure adjusting method is applied to an alternating-current variable-frequency air duct machine and is characterized by comprising the following steps of:
obtaining a design static pressure value P1 of the alternating-current variable-frequency air pipe machine;
acquiring an actual static pressure value P2 of the AC variable frequency air duct machine, wherein the step of acquiring the actual static pressure value P2 of the AC variable frequency air duct machine comprises the following steps: counting a reference data table, wherein the reference data table comprises a corresponding relation among an air outlet static pressure value P4 of an air volume box, a current value I of a motor in an air supply mode and a coil temperature t of an evaporator in a refrigeration mode; determining the corresponding outlet static pressure value P4 as the actual static pressure value P2 according to the corresponding relation among the actual current value Is of the motor in the air supply mode, the actual coil temperature ts of the evaporator in the refrigeration mode and the reference data table in the actual work of the alternating-current variable-frequency air duct machine;
determining a static pressure error value delta P of the alternating-current variable-frequency air duct machine according to the design static pressure value P1 and the actual static pressure value P2;
and determining the quantity value N of the filter screens to be additionally arranged according to the static pressure error value delta P and the resistance value P3 of the filter screens, wherein N filter screens are used for being additionally arranged at the air outlet of the alternating-current variable-frequency air duct machine.
2. The method of static pressure regulation according to claim 1, wherein said step of determining a static pressure error value Δ P for said ac variable frequency duct machine based on said design static pressure value P1 and said actual static pressure value P2 comprises:
and calculating the difference value between the design static pressure value P1 and the actual static pressure value P2, wherein the difference value is the static pressure error value delta P.
3. The method of claim 1, wherein the step of determining a number of filter screens to be added, N, based on the static pressure error value Δ P and the resistance value P3 of the filter screens comprises:
and calculating a result value of dividing the static pressure error value delta P by the resistance value P3 of the filter screen, wherein the result value is the quantity value N.
4. The method of static pressure regulation according to claim 1, wherein the step of statistically referencing a data table comprises:
controlling the alternating-current variable-frequency air duct machine to operate for a first preset time in an air supply mode;
and recording the static air outlet pressure value P4 of the air volume box and the current value I of the motor in the air supply mode.
5. The method of static pressure regulation according to claim 4, characterized in that the first preset period of time ranges from 0.5min to 1.5 min.
6. The method of static pressure regulation according to claim 1, wherein the step of statistically referencing a data table comprises:
controlling the alternating-current variable-frequency air pipe machine to run for a second preset time in a refrigeration mode;
and recording the outlet static pressure value P4 of the air volume box and the coil temperature t of the evaporator in the refrigeration mode.
7. The method of static pressure regulation according to claim 6, characterized in that the second preset period of time ranges from 0.5min to 1.5 min.
8. An alternating-current variable-frequency air duct machine is characterized by comprising N additional filter screens, wherein the filter screens are arranged at an air outlet, and N is determined according to a static pressure error value delta P and a resistance value P3 of the filter screens; the static pressure error value delta P is determined according to a design static pressure value P1 and an actual static pressure value P2, the actual static pressure value P2 is obtained according to an air outlet static pressure value P4 of the alternating-current variable-frequency air pipe machine in actual work, the air outlet static pressure value P4 is determined according to a reference data table, and the reference data table comprises a corresponding relation of an air outlet static pressure value P4 of an air volume box, a current value I of a motor in an air supply mode and a coil temperature t of an evaporator in a refrigeration mode.
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| CN115682298A (en) * | 2021-07-28 | 2023-02-03 | 广东美的暖通设备有限公司 | Filter screen detection method of indoor unit, air conditioner and readable storage medium |
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| US6993414B2 (en) * | 2003-12-18 | 2006-01-31 | Carrier Corporation | Detection of clogged filter in an HVAC system |
| CN103423837B (en) * | 2013-07-25 | 2015-09-30 | 青岛海信日立空调系统有限公司 | Free static pressure air-cooled ducted air conditioner |
| CN204153880U (en) * | 2014-10-21 | 2015-02-11 | 深圳市民润环保科技有限公司 | A kind of way flow New-air purifying system that can improve static pressure steady air flow |
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