Air conditioner air system self-cleaning method

Abstract

The present application relates to new energy air conditioning technical field, especially air conditioning wind system self-cleaning method.In the filter screen, wet curtain, heat exchanger with fin and single-row copper pipe with fin are sequentially installed with five-stage wind pressure sensor, through five wind pressure sensors, the filter screen, wet curtain, heat exchanger and single-row copper pipe with fin are monitored respectively, and the specific components needing cleaning in air conditioner are judged in real time;Through logical analysis and experimental verification, the cleaning conditions and cleaning methods of filter screen, wet curtain, heat exchanger and single-row copper pipe with fin are formulated respectively.The whole monitoring and cleaning process does not need to increase cleaning component, reduces the cost of air conditioner, and increases the stability of air conditioner use.

Description

Technical Field

[0001] This invention relates to the field of new energy air conditioning technology, and in particular to a self-cleaning method for an air conditioning system. Background Technology

[0002] During air conditioning use, indoor dust, lint, and other pollutants will enter the air system. Over time, these pollutants will accumulate on components such as filters, wet curtains, and heat exchangers, increasing the air intake resistance of these components and reducing the air conditioning's performance. Therefore, it is necessary to clean these components frequently.

[0003] Currently, most cleaning is done manually. If the outdoor unit of the air conditioner is installed at a high altitude, the cost of cleaning is high and there are certain safety risks. There are also some air conditioners with self-cleaning functions. For example, CN202010642808.5 discloses a method for cleaning fan coil units, air conditioners and filters. The cleaning component is installed separately inside the air conditioner, which increases the production cost of the air conditioner, increases the weight of the air conditioner and thus leads to additional installation risks. The added cleaning component also increases the failure rate of the air conditioner. Summary of the Invention

[0004] This invention provides a self-cleaning method for an air conditioning system, which can complete the self-cleaning of the air conditioner without adding additional cleaning components.

[0005] To solve the above-mentioned technical problems, the present invention provides a self-cleaning method for an air conditioning system, wherein the following components are installed sequentially in the air path from air inlet to air outlet: an outdoor fan, a filter screen, a wet curtain, a finned heat exchanger, a multi-row pipe network without fins, a single-row copper pipe with fins, and an indoor fan.

[0006] The self-cleaning method of the air system is as follows:

[0007] Install a zero-pressure sensor P0 between the filter and the air inlet;

[0008] Install the first wind pressure sensor P1 between the filter and the wet curtain;

[0009] Install a second air pressure sensor P2 between the wet curtain and the heat exchanger;

[0010] Install a third air pressure sensor P3 at the rear of the heat exchanger;

[0011] A fourth wind pressure sensor P4 and a fifth wind pressure sensor P5 are installed on the front and rear sides of a single row of finned copper tubes, respectively.

[0012] Based on the data collected by the zero-pressure sensor P0, the first pressure sensor P1, the second pressure sensor P2, the third pressure sensor P3, the fourth pressure sensor P4, and the fifth pressure sensor P5, the finned single-row copper tubes, heat exchanger, wet curtain, and filter screen are self-cleaned in sequence.

[0013] As a preferred embodiment of the above technical solution, the finned single-row copper tubes, heat exchanger, evaporative cooling pad, and filter are sequentially self-cleaned. The specific method is as follows:

[0014] If P4-P5 exceeds the fourth threshold, the finned single-row steel pipe will be self-cleaned.

[0015] If P4-P5 is less than the fourth threshold and P2-P3 exceeds the third threshold, then the heat exchanger will perform self-cleaning.

[0016] If P4-P5 is less than the fourth threshold, P2-P3 is less than the third threshold, and P1-P2 is greater than the second threshold, then the wet curtain will perform self-cleaning.

[0017] If P4-P5 is less than the fourth threshold, P2-P3 is less than the third threshold, P1-P2 is less than the second threshold, and P0-P1 is greater than the first threshold, then the filter will self-clean.

[0018] As a preferred embodiment of the above technical solution, the fourth threshold, the third threshold, the second threshold, and the first threshold are all obtained by looking up a table based on the design resistance.

[0019] As a preferred embodiment of the above technical solution, the finned single-row steel pipe is self-cleaned using the following method:

[0020] If not in cooling mode, the outdoor unit will enter self-cleaning mode.

[0021] If in cooling mode, turn off the wet curtain and turn the outdoor fan forward until P4-P5 is less than the fourth threshold, or the outdoor fan turns forward for a preset time.

[0022] As a preferred embodiment of the above technical solution, the heat exchanger is self-cleaned, and the specific method is as follows:

[0023] When P0-P1 is less than the first threshold and P1-P2 is less than the second threshold;

[0024] If not in cooling mode, it will enter external self-cleaning mode;

[0025] If in cooling mode, turn on the evaporative cooling pad and reverse the outdoor fan until P2-P3 is less than the third threshold, or the outdoor fan reverses for the preset time.

[0026] As a preferred embodiment of the above technical solution, the wet curtain is self-cleaned, and the specific method is as follows:

[0027] The external fan rotates forward, increasing the water flow rate of the wet curtain until P1-P2 is less than the second threshold, or reaches the preset time.

[0028] As a preferred embodiment of the above technical solution, the filter screen is self-cleaned, and the specific method is as follows:

[0029] The wet curtain is turned off, and the outdoor fan reverses until P0-P1 is less than the first threshold or the preset time is reached.

[0030] As a preferred embodiment of the above technical solution, the formula for calculating the rotation time of the external or internal fan is as follows:

[0031] Assume the functional relationship between pressure difference and time is ΔPt=K*Tt+C, where K is the rate of change of pressure difference per unit time, Tt is the required time, and K and C are constants;

[0032] Get the pressure difference at time t0 as ΔP0 and the pressure difference at time t1 as ΔP1, and calculate K and C through linear fitting;

[0033] Calculate the rotation time of the external or internal fan using the formula T=(ΔP-C) / K.

[0034] As a preferred embodiment of the above technical solution, experimental data was obtained through a dirt blockage experiment, and the calculated values ​​of k = 3.33 and c = 10 were obtained from the experimental data.

[0035] As a preferred option among the above technical solutions, the outdoor unit's self-cleaning mode is implemented as follows:

[0036] Condensation is caused by reducing the speed of the external fan to the first preset speed, which causes condensation in the heat exchanger.

[0037] When frosting occurs, the outdoor unit temperature protection will be turned off, and the outdoor fans will be stopped sequentially within the first preset time period, and then run at the second preset speed.

[0038] During defrosting, when the outdoor ambient temperature is higher than the preset value, the compressor will be turned off and the indoor fan will be stopped within the second preset time period. After the temperature rises to the target temperature, the indoor fan will be started at the preset speed. If defrosting fails, the system will switch to the maximum cooling mode on the indoor side for defrosting.

[0039] Drying is performed to maintain the heat exchanger at the preset drying temperature.

[0040] Due to the adoption of the above solutions, the present invention has the following beneficial effects:

[0041] 1. Five wind pressure sensors are used to monitor obstructions in the filter, wet curtain, heat exchanger, and finned single-row copper pipe, respectively, to determine the specific components inside the air conditioner that need cleaning in real time.

[0042] 2. Through logical analysis and experimental verification, cleaning conditions and methods were established for the filter screen, wet curtain, heat exchanger, and finned single-row copper tube.

[0043] 3. The entire monitoring and cleaning process does not require additional cleaning components, reducing air conditioning costs and increasing the stability of air conditioning use.

[0044] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the internal air conditioning system structure.

[0046] Figure 2 This is a schematic diagram of the self-cleaning process;

[0047] Figure 3 This is a schematic diagram of the outdoor unit's self-cleaning mode process. Detailed Implementation

[0048] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0049] A self-cleaning method for air conditioning systems, in air systems such as Figure 1 As shown, the following components are installed sequentially from the air inlet to the air outlet: an external fan, a filter screen, a wet curtain, a finned heat exchanger, a multi-row pipe network without fins, a single-row copper pipe with fins, and an internal fan.

[0050] The self-cleaning method of the air system, such as Figure 2 As shown:

[0051] S1. Install the zero-pressure sensor P0 between the filter and the air inlet;

[0052] Install the first wind pressure sensor P1 between the filter and the wet curtain;

[0053] Install a second air pressure sensor P2 between the wet curtain and the heat exchanger;

[0054] Install a third air pressure sensor P3 at the rear of the heat exchanger;

[0055] A fourth wind pressure sensor P4 and a fifth wind pressure sensor P5 are installed on the front and rear sides of a single row of finned copper tubes, respectively.

[0056] S2. Based on the data collected by the zero-pressure sensor P0, the first pressure sensor P1, the second pressure sensor P2, the third pressure sensor P3, the fourth pressure sensor P4, and the fifth pressure sensor P5, the finned single-row copper tubes, heat exchanger, wet curtain, and filter screen are self-cleaned in sequence.

[0057] S21. If P4-P5 exceed the fourth threshold, then the finned single-row steel pipe will be self-cleaned. The specific method is as follows:

[0058] If not in cooling mode, the outdoor unit will enter self-cleaning mode.

[0059] If in cooling mode, turn off the wet curtain and turn the outdoor fan forward until P4-P5 is less than the fourth threshold, or the outdoor fan turns forward for a preset time.

[0060] S22. If P4-P5 is less than the fourth threshold and P2-P3 exceeds the third threshold, then the heat exchanger will be self-cleaned. The specific method is as follows:

[0061] When P0-P1 is less than the first threshold and P1-P2 is less than the second threshold;

[0062] If not in cooling mode, it will enter external self-cleaning mode;

[0063] If in cooling mode, turn on the evaporative cooling pad and reverse the outdoor fan until P2-P3 is less than the third threshold, or the outdoor fan reverses for the preset time.

[0064] S23. If P4-P5 is less than the fourth threshold, P2-P3 is less than the third threshold, and P1-P2 is greater than the second threshold, then the wet curtain will perform self-cleaning, as follows:

[0065] The external fan rotates forward, increasing the water flow rate of the wet curtain until P1-P2 is less than the second threshold, or reaches the preset time.

[0066] S24. If P4-P5 is less than the fourth threshold, P2-P3 is less than the third threshold, P1-P2 is less than the second threshold, and P0-P1 is greater than the first threshold, then the filter screen will be self-cleaned. The specific method is as follows:

[0067] The wet curtain is turned off, and the outdoor fan reverses until P0-P1 is less than the first threshold or the preset time is reached.

[0068] In steps S21 and S22 of this embodiment, the outdoor unit self-cleaning mode, such as... Figure 3 As shown, the specific method is as follows:

[0069] Condensation is caused by reducing the speed of the external fan to the first preset speed, which causes condensation in the heat exchanger.

[0070] When frosting occurs, the outdoor unit temperature protection will be turned off, and the outdoor fans will be stopped sequentially within the first preset time period, and then run at the second preset speed.

[0071] During defrosting, when the outdoor ambient temperature is higher than the preset value, the compressor will be turned off and the indoor fan will be stopped within the second preset time period. After the temperature rises to the target temperature, the indoor fan will be started at the preset speed. If defrosting fails, the system will switch to the maximum cooling mode on the indoor side for defrosting.

[0072] Drying is performed to maintain the heat exchanger at the preset drying temperature.

[0073] In step S2 of this embodiment, the formula for calculating the rotation time of the external or internal fan is as follows:

[0074] Assume the functional relationship between pressure difference and time is ΔPt=K*Tt+C, where K is the rate of change of pressure difference per unit time, Tt is the required time, and K and C are constants;

[0075] Get the pressure difference at time t0 as ΔP0 and the pressure difference at time t1 as ΔP1, and calculate K and C through linear fitting;

[0076] Calculate the rotation time of the external or internal fan using the formula T=(ΔP-C) / K.

[0077] Experimental data were obtained through a dirt blockage experiment, and the calculated values ​​were k = 3.33 and c = 10.

[0078] If the pressure difference to be reduced is 20 Pa, substituting into the formula, the running time is: 20 - 10 / 0.0333 = 300 seconds.

[0079] In step S2 of the embodiment, the fourth threshold, the third threshold, the second threshold, and the first threshold are all obtained by looking up a table based on the design resistance. The resistance value table is as follows:

[0080]

[0081]

[0082] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0083] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0084] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A self-cleaning method for an air conditioning system, characterized in that, The following components are installed sequentially in the air duct from air inlet to air outlet: outdoor fan, filter screen, wet curtain, finned heat exchanger, multi-row pipe network without fins, single-row copper pipe with fins, and indoor fan. The self-cleaning method of the air system is as follows: Install a zero-pressure sensor P0 between the filter and the air inlet; Install the first wind pressure sensor P1 between the filter and the wet curtain; Install a second air pressure sensor P2 between the wet curtain and the heat exchanger; Install a third air pressure sensor P3 at the rear of the heat exchanger; A fourth wind pressure sensor P4 and a fifth wind pressure sensor P5 are installed on the front and rear sides of a single row of finned copper tubes, respectively. Based on the data collected by the zero-pressure sensor P0, the first pressure sensor P1, the second pressure sensor P2, the third pressure sensor P3, the fourth pressure sensor P4, and the fifth pressure sensor P5, the finned single-row copper tubes, heat exchanger, wet curtain, and filter screen are self-cleaned in sequence.

2. The self-cleaning method for an air conditioning system according to claim 1, characterized in that, The finned single-row copper tubes, heat exchanger, evaporative cooling pad, and filter screen are self-cleaned sequentially, using the following method: If P4-P5 exceeds the fourth threshold, the finned single-row steel pipe will be self-cleaned. If P4-P5 is less than the fourth threshold and P2-P3 exceeds the third threshold, then the heat exchanger will perform self-cleaning. If P4-P5 is less than the fourth threshold, P2-P3 is less than the third threshold, and P1-P2 is greater than the second threshold, then the wet curtain will perform self-cleaning. If P4-P5 is less than the fourth threshold, P2-P3 is less than the third threshold, P1-P2 is less than the second threshold, and P0-P1 is greater than the first threshold, then the filter will self-clean.

3. The self-cleaning method for an air conditioning system according to claim 2, characterized in that, The fourth threshold, third threshold, second threshold, and first threshold are all obtained by looking up a table based on the design resistance.

4. The self-cleaning method for an air conditioning system according to claim 2, characterized in that, The self-cleaning method for finned single-row steel pipes is as follows: If not in cooling mode, the outdoor unit will enter self-cleaning mode. If in cooling mode, turn off the wet curtain and turn the outdoor fan forward until P4-P5 is less than the fourth threshold, or the outdoor fan turns forward for a preset time.

5. The self-cleaning method for an air conditioning system according to claim 2, characterized in that, The following are the specific methods for self-cleaning the heat exchanger: When P0-P1 is less than the first threshold and P1-P2 is less than the second threshold; If not in cooling mode, it will enter external self-cleaning mode; If in cooling mode, turn on the evaporative cooling pad and reverse the outdoor fan until P2-P3 is less than the third threshold, or the outdoor fan reverses for the preset time.

6. The self-cleaning method for an air conditioning system according to claim 2, characterized in that, The specific method for self-cleaning evaporative cooling pads is as follows: The external fan rotates forward, increasing the water flow rate of the wet curtain until P1-P2 is less than the second threshold, or reaches the preset time.

7. The self-cleaning method for an air conditioning system according to claim 2, characterized in that, The following are the specific methods for self-cleaning the filter: The wet curtain is turned off, and the outdoor fan reverses until P0-P1 is less than the first threshold or the preset time is reached.

8. The self-cleaning method for an air conditioning system according to claim 3, 4, 5, 6 or 7, characterized in that, The formula for calculating the rotation time of the external or internal fan is as follows: Assume the functional relationship between pressure difference and time is ΔPt=K*Tt+C, where K is the rate of change of pressure difference per unit time, Tt is the required time, and K and C are constants; Get the pressure difference at time t0 as ΔP0 and the pressure difference at time t1 as ΔP1, and calculate K and C through linear fitting; Calculate the rotation time of the external or internal fan using the formula T=(ΔP-C) / K.

9. The self-cleaning method for an air conditioning system according to claim 8, characterized in that, Experimental data were obtained through a dirt blockage experiment, and the calculated values ​​were k = 3.33 and c = 10.

10. The self-cleaning method for an air conditioning system according to claim 4 or 5, characterized in that, The outdoor unit's self-cleaning mode is activated as follows: Condensation is caused by reducing the speed of the external fan to the first preset speed, which causes condensation in the heat exchanger. When frosting occurs, the outdoor unit temperature protection will be turned off, and the outdoor fans will be stopped sequentially within the first preset time period, and then run at the second preset speed. During defrosting, when the outdoor ambient temperature is higher than the preset value, the compressor is turned off sequentially, the indoor fan is stopped, and the compressor is turned on during the second preset time period. After the temperature rises to the target temperature, the indoor fan is started at a preset speed. If defrosting fails, switch to the maximum cooling mode on the indoor side to defrost; Drying is performed to maintain the heat exchanger at the preset drying temperature.

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