Air conditioner baseplate ice control method and air conditioner system

Abstract

This invention provides a method for controlling the defrosting of an air conditioning chassis and an air conditioning system, comprising the following steps: When the air conditioner is running in heating mode, the outdoor ambient temperature is acquired; when the outdoor ambient temperature T... 外环 Lower than the outer ring preset value T 预设 When the air conditioner activates defrost mode, it operates in defrost mode and activates the chassis heating. After defrost mode operation ends, the chassis heating is turned off after a delay of t1. The delay t1 is determined based on the difference Δt between the delay t0 of the previous defrost mode operation and the duration of the two most recent heating modes. By adjusting the chassis heating duration using the difference between the previous defrost mode delay and the duration of the two most recent heating modes, power consumption is minimized while ensuring the chassis does not freeze. This also effectively avoids situations where the chassis electric heating is on even without defrost water, thus saving energy.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to an air conditioning chassis de-icing control method and an air conditioning system. Background Technology

[0002] When an air conditioner is in heating mode, frost will form on the outdoor heat exchanger when the outdoor ambient temperature is low and the humidity is high. To ensure the heating effect, defrosting will occur once the frost layer reaches a certain thickness, melting the frost into water, which then flows to the chassis and drains through the drain holes. However, when the outdoor ambient temperature is too low, the chassis temperature will also be low. The defrosting water will freeze on the chassis surface before it reaches the drain holes, eventually causing the ice layer on the chassis to become thicker and thicker, interfering with the outdoor fan blades and even damaging them.

[0003] To avoid the above risks, existing technologies often incorporate electric heating elements on the chassis. When the air conditioner is in heating mode and the outdoor ambient temperature is below a certain set value, the electric heating elements on the chassis activate to heat the chassis, ensuring that the chassis temperature does not drop too low and allowing defrost water to drain smoothly. However, the chassis electric heating elements have a high power rating. When the outdoor ambient temperature is low, the outdoor heat exchanger may not necessarily frost up. Therefore, controlling the activation of electric heating solely based on the outdoor ambient temperature may lead to continuous operation of the electric heating, resulting in wasted energy. Summary of the Invention

[0004] In view of this, the present invention aims to propose an air conditioning chassis de-icing control method and air conditioning system to solve the problem in the prior art that the electric heating is controlled to start only by the outdoor ambient temperature, which may lead to the continuous operation of the electric heating and waste of electricity.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] A method for controlling the de-icing of an air conditioning chassis includes the following steps:

[0007] When the air conditioner is running in heating mode, it obtains the outdoor ambient temperature.

[0008] outdoor ambient temperature T 外环 Lower than the outer ring preset value T 预设 Furthermore, when the air conditioner is in defrost mode, the air conditioner operates in defrost mode and the chassis heating is activated;

[0009] After the defrosting mode operation ends, the chassis heating is turned off after a delay of t1. The delay t1 is determined based on the delay t0 of the previous defrosting mode operation and the difference Δt between the duration of the two most recent heating modes.

[0010] Where Δt = t4 - t3, t4 is the duration of the current heating mode, and t3 is the duration of the previous heating mode.

[0011] When Δt > a, t1 < t0; when Δt < b, t1 > t0; where a and b are preset values, a > 0 and b < 0.

[0012] When Δt is less than the constant b, extend the current delay duration t1; when Δt is greater than the constant a, shorten the current delay duration t1. If the current mode's duration is shorter than the previous one, it indicates that the outdoor heat exchanger surface frosts more easily and quickly, possibly due to insufficient defrost water drainage. Therefore, the current chassis heating duration should be appropriately increased, i.e., the delay duration t1 should be appropriately increased. If the current heating mode's duration is longer than the previous heating mode's duration, it indicates that the outdoor heat exchanger surface is less prone to frost formation compared to the previous one, further indicating that defrost water can be completely drained in a timely manner. Appropriately shortening the current chassis heating duration, while ensuring the chassis does not freeze, reduces power consumption and saves energy.

[0013] Furthermore, the delay duration t1 is determined based on the difference Δt between the delay duration t0 of the previous defrosting mode and the duration of continuous operation of the two most recent heating modes, including the following process:

[0014] When Δt > a, t1 = t0 - t 修正 , where t 修正 It is positively correlated with Δt; if the difference Δt between the two most recent heating modes is greater than the constant a, it means that the current heating mode lasts longer than the previous heating mode. In this case, the delay time t1 should be appropriately shortened according to the magnitude of the difference Δt between the two most recent heating modes.

[0015] When b < Δt < a, the delay time t1 remains unchanged; this indicates that the duration of the heating mode is not much different from the duration of the previous heating mode, and the duration of chassis heating in this case can be kept the same as the previous one.

[0016] When Δt < b, t1 = t0 + t 修正 , where t 修正 It is positively correlated with the absolute value of Δt; if the difference Δt between the two most recent heating modes is less than a certain negative number, it means that the current heating mode is less than the previous heating mode. In this case, the delay time t1 should be appropriately increased according to the difference Δt between the two most recent heating modes. The shorter the current heating mode is, the more the delay time t1 needs to be increased.

[0017] Furthermore, when Δt>a, t 修正 / Δt=1 / 3.

[0018] Furthermore, when Δt < b, t 修正 / |Δt|=1 / 3.

[0019] Furthermore, when t1 < t min At that time, the chassis heating operation delay time t min Then turn off the chassis heating; when t1>t max At that time, the chassis heating operation delay time t max Then turn off the chassis heating. That is, when the corrected delay time t1 is less than t min At that time, the delay duration t1 is according to t min Run; when the corrected delay t1 is greater than t max At that time, the delay duration t1 is according to t max run.

[0020] Furthermore, the initial delay time t1 after the air conditioner is turned on is equal to (t min +t max ) / 2.

[0021] Furthermore, t min For 5–15 minutes, t max For 25 to 50 minutes.

[0022] Furthermore, when defrosting mode is activated, the duration of the current heating mode is obtained.

[0023] Compared with existing technologies, the air conditioning chassis de-icing control method of the present invention has the following advantages:

[0024] The chassis heating duration is adjusted by the difference between the delay time of the previous defrosting mode and the continuous running time of the two most recent heating modes. If the chassis does not freeze but the chassis heating duration is too long, the chassis heating time is appropriately shortened; if the chassis freezes, the chassis heating time is appropriately increased. This ensures that power consumption is reduced as much as possible while saving energy, while ensuring that the chassis does not freeze. At the same time, the judgment index for chassis defrosting start time is added to determine whether defrosting conditions are met, which fully avoids the situation where the chassis electric heating is turned on when there is no defrosting water, and further avoids the waste of electricity.

[0025] The present invention also provides an air conditioning system capable of executing the above-described air conditioning chassis de-icing control method. The air conditioning system includes an indoor heat exchanger, an outdoor heat exchanger, and a compressor. The outdoor heat exchanger is mounted on an outdoor chassis, and an electric heating device is mounted on the outdoor chassis for heating the outdoor chassis.

[0026] The advantages of the air conditioning system and the air conditioning chassis de-icing control method mentioned above compared to the prior art are the same, and will not be repeated here. Attached Figure Description

[0027] Figure 1 This is a flowchart of the air conditioning chassis de-icing control method according to an embodiment of the present invention;

[0028] Figure 2 This is a flowchart illustrating the delay duration t1 correction process according to an embodiment of the present invention. Detailed Implementation

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] As shown in the figure, this embodiment provides a method for controlling the de-icing of an air conditioning chassis, including the following steps:

[0031] S100: When the air conditioner is in heating mode, it obtains the outdoor ambient temperature.

[0032] When the air conditioner is in heating mode, ice may form on the chassis when the outdoor temperature is low. Therefore, it is necessary to continuously monitor the outdoor temperature and control the electric heating structure on the chassis in a timely manner.

[0033] S200, the air conditioner is running in defrost mode, and the chassis heating is turned on at the same time;

[0034] When the outdoor ambient temperature T 外环 Lower than the outer ring preset value T 预设 When the air conditioning unit meets the defrosting conditions, it indicates that the outdoor ambient temperature is low and frost has formed on the outdoor heat exchanger. Therefore, the defrosting mode needs to be activated to defrost the outdoor heat exchanger. During the defrosting process, to ensure that the water from the melting frost on the outdoor heat exchanger flows smoothly to the drain hole in the chassis and prevents the water from freezing on the chassis surface, chassis heating is activated during defrosting mode. This prevents the defrosting water from freezing on the chassis surface after it falls to the floor.

[0035] Furthermore, when the defrosting mode is activated, the four-way valve switches to defrost, and the duration of the current heating mode operation is obtained.

[0036] After the S300 defrost mode finishes running, the chassis heating will continue to run for a delay of t1 before being turned off.

[0037] After the defrosting mode operation ends, some defrost water may still flow to the chassis or chassis drain holes. In this case, chassis heating should continue for a period of time to prevent the remaining defrost water from freezing on the chassis surface and to ensure that all defrost water flows fully to the chassis drain holes and is discharged. Therefore, the chassis heating delay time t1 is the duration of chassis heating after defrosting ends. Furthermore, the delay time t1 starts timing from the moment the compressor restarts heating after defrosting ends.

[0038] Furthermore, the delay duration t1 is determined based on the difference Δt between the delay duration t0 of the previous defrosting mode and the duration of continuous operation of the two most recent heating modes, where Δt = t4 - t3, t4 is the duration of continuous operation of the current heating mode, and t3 is the duration of continuous operation of the previous heating mode.

[0039] When Δt is less than the constant b, the delay duration t1 is extended, i.e., t1 > t0; when Δt is greater than the constant a, the delay duration t1 is shortened, i.e., t1 < t0. If the duration of this heating mode is shorter than the previous one, it indicates that the outdoor heat exchanger surface frosts more easily and faster, possibly due to the defrosting water not draining completely in time. Therefore, the duration of the chassis heating should be appropriately increased, i.e., the delay duration t1 should be appropriately increased. If the duration of this heating mode is longer than the previous heating mode, it indicates that the outdoor heat exchanger surface is less prone to frost formation than before, further indicating that the defrosting water can be drained completely in time. Therefore, to avoid wasting electricity, the duration of the chassis heating can be appropriately shortened, i.e., the delay duration t1 should be appropriately shortened. Here, a and b are preset values, a > 0, b < 0.

[0040] The continuous running time of the heating mode described in this embodiment refers to the time from the end of the previous defrosting cycle, when the compressor restarts heating, to the start of the current defrosting cycle and when the compressor stops heating.

[0041] Furthermore, determining the delay time t1 based on the difference Δt between the delay time t0 of the previous defrosting mode and the duration of continuous operation of the two most recent heating modes includes the following process:

[0042] When Δt > a, the delay duration t1 decreases by the correction value t. 修正 Correction value t 修正 It is positively correlated with Δt. That is, as the difference Δt between the durations of the two most recent heating modes decreases, the decrease in delay time t1 also gradually decreases. Where the difference Δt between the durations of the two most recent heating modes is greater than a, it indicates that the duration of the current heating mode is longer than the previous heating mode. In this case, the delay time t1 should be appropriately shortened according to the magnitude of the difference Δt between the two most recent heating modes. Furthermore, the longer the duration of the current heating mode, the greater the reduction in delay time t1. Preferably, t...修正 / Δt=1 / 3.

[0043] When the difference Δt between the durations of the two most recent heating modes is b≤Δt≤a, the delay duration t1 remains unchanged; that is, when Δt is within the preset range, the delay duration t1 remains unchanged. In other words, when b≤Δt≤a, it indicates that the duration of the current heating mode is not significantly different from the previous heating mode, and the duration of chassis heating in this instance should remain the same as before; that is, the delay duration t1 should remain unchanged.

[0044] When Δt < b, the delay duration t1 is increased by the correction value t. 修正 Correction value t 修正 It is positively correlated with the absolute value of Δt. That is, as the absolute value of the difference Δt between the durations of the two most recent heating modes increases, the increase in delay time t1 gradually increases. If the difference Δt between the durations of the two most recent heating modes is less than a certain negative number, it indicates that the duration of the current heating mode is less than the duration of the previous heating mode. In this case, the delay time t1 needs to be appropriately increased according to the magnitude of the difference Δt between the two most recent heating modes, and the shorter the duration of the current heating mode, the greater the increase in delay time t1 needs to be. Preferably, t... 修正 / |Δt|=1 / 3.

[0045] Furthermore, after correcting the delay duration t1 based on the difference Δt between the duration of this heating mode and the duration of the previous heating mode, the control delay duration t1 should be within the range of t. min ~t max Between. Specifically, when the corrected delay t1 is less than t. min At that time, the chassis heating operation delay time t min Then turn off the chassis heating; when the corrected delay time t1 is greater than t max At that time, the chassis heating operation delay time t max Then turn off the chassis heating. Avoid frequently turning on the electric heating when the electric heating duration is too short, and also avoid the electric heating duration being too long, which may affect other components or the normal heat exchange of the outdoor heat exchanger of the air conditioner.

[0046] The initial delay t1 after the air conditioner is turned on and running is calculated according to (t min +t max ) / 2, where t min and t max Based on the experimental data, t min For 5–15 minutes, t max The optimal time is 25–50 min, t min =10min,t max =40min.

[0047] The air conditioner chassis defrosting control method provided in this embodiment corrects the chassis heating duration by using the difference between the delay time of the previous defrosting mode and the continuous running time of the two most recent heating modes. If the chassis does not freeze but the chassis heating duration is too long, the chassis heating time is appropriately shortened; if the chassis freezes, the chassis heating time is appropriately increased. This ensures that power consumption is minimized and energy is saved while preventing the chassis from freezing. At the same time, the judgment index for chassis defrosting start time is added to determine whether defrosting conditions are met, which fully avoids the situation where the chassis electric heating is turned on even without defrosting water, further avoiding energy waste.

[0048] As part of an embodiment of the present invention, the detailed process of correcting the delay time t1 based on the delay time t1 of the previous defrosting mode and the difference Δt between the durations of the two most recent heating modes is described below:

[0049] When the difference Δt between the durations of the two most recent heating modes is greater than 15 minutes, it indicates that the duration of the current heating mode is longer than that of the previous heating mode. This further indicates that the defrost water can be fully and completely drained within the delay time t1 after the end of the last defrost. In other words, the delay time t1 can be significantly shortened this time, for example, by 5 minutes. This will significantly reduce power consumption while ensuring that the chassis does not freeze.

[0050] When the difference Δt between the duration of the two most recent heating modes is between 10 min and 15 min, it indicates that the duration of the current heating mode is longer than that of the previous heating mode. This further indicates that the defrosting water can be fully and completely drained within the delay time t1 after the end of the last defrost. Therefore, the delay time t1 can be appropriately shortened this time. For example, the delay time t1 can be shortened by 3 min to appropriately reduce power consumption while ensuring that the chassis does not freeze.

[0051] When the difference Δt between the duration of the two most recent heating modes is between 5 min and 10 min, it indicates that the duration of the current heating mode is slightly longer than that of the previous heating mode. This further indicates that the defrosting water can be fully and completely drained within the delay time t1 after the end of the last defrost. Therefore, the delay time t1 can be slightly shortened this time, for example, by 1 min, to minimize power consumption while ensuring that the chassis does not freeze.

[0052] When the difference Δt between the duration of the most recent two heating modes is between -5 min and 5 min, it indicates that the duration of the current heating mode is basically the same as the duration of the previous heating mode. This further indicates that within the delay time t1 after the end of the last defrost, the defrost water can be basically discharged and no ice layer that affects the operation of the fan will be generated on the chassis. At this time, the delay time t1 can be kept unchanged.

[0053] When the difference Δt between the duration of the two most recent heating modes is between -10 min and -5 min, it indicates that the duration of the current heating mode is slightly shorter than the duration of the previous heating mode. This further suggests that the defrost water may not have been fully drained within the delay time t1 after the end of the previous defrost. In this case, the delay time t1 should be appropriately extended, for example, by increasing the delay time t1 by 1 min, to ensure that the defrost water can be fully drained from the chassis.

[0054] When the difference Δt between the duration of the two most recent heating modes is between -15 min and -10 min, it indicates that the duration of the current heating mode is shorter than the duration of the previous heating mode. This further indicates that the defrost water was not fully drained within the delay time t1 after the end of the last defrost. In this case, the delay time t1 needs to be extended. For example, the delay time t1 can be increased by 3 min to ensure that the defrost water can be fully drained from the chassis.

[0055] When the difference Δt between the durations of the two most recent heating modes is less than -15 min, it indicates that the duration of the current heating mode is much shorter than the duration of the previous heating mode. This further suggests that a large amount of defrost water may still remain within the delay time t1 after the end of the last defrost. In this case, the delay time t1 needs to be significantly extended, for example, by increasing the delay time t1 by 5 min, to ensure that the defrost water can be fully drained from the chassis.

[0056] As part of an embodiment of the present invention, an air conditioning system is also provided. This air conditioning system is capable of executing the aforementioned air conditioning chassis de-icing control method. The air conditioning system includes an indoor heat exchanger, an outdoor heat exchanger, and a compressor. The outdoor heat exchanger is mounted on an outdoor chassis. Condensate generated on the outdoor heat exchanger is discharged to the outside through the chassis. An electric heating device is installed on the outdoor chassis for electrically heating the chassis. Preferably, the electric heating device can be a heating belt or other structure capable of heating the chassis.

[0057] In this embodiment, the air conditioning system is configured as an inverter air conditioner.

[0058] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A method for controlling the de-icing of an air conditioning chassis, characterized in that, Includes the following steps: When the air conditioner is running in heating mode, it obtains the outdoor ambient temperature. In an outdoor environment temperature T 外环 Lower than the outer ring preset value T 预设 , and the air conditioning open defrost mode, open the chassis heating; After the defrosting mode is completed, the chassis heating is turned off after a delay of t1. The delay t1 is determined based on the delay t0 of the previous defrosting mode and the difference Δt between the duration of the two most recent heating modes. Where Δt = t4 - t3, t4 is the duration of the current heating mode, and t3 is the duration of the previous heating mode. When Δt > a, t1 < t0; when Δt < b, t1 > t0; where a and b are preset values, a > 0 and b < 0.

2. The air conditioning chassis de-icing control method according to claim 1, characterized in that, The delay duration t1 is determined based on the difference Δt between the delay duration t0 of the previous defrosting mode and the duration of continuous operation of the two most recent heating modes, including: When Δt>a, t1=t0-t 修正 , where t 修正 It is positively correlated with Δt; When Δt < b, t1 = t0 + t 修正 , where t 修正 It is positively correlated with the absolute value of Δt.

3. The air conditioning chassis de-icing control method according to claim 2, characterized in that, When Δt>a, t 修正 / Δt=1 / 3.

4. The air conditioning chassis de-icing control method according to claim 2, characterized in that, When Δt < b, t 修正 / |Δt|=1 / 3.

5. The air conditioning chassis de-icing control method according to claim 1, characterized in that, When t1 < t min At that time, the chassis heating operation delay time t min Then turn off the chassis heating; When t1>t max At that time, the chassis heating operation delay time t max Then turn off the chassis heating.

6. The air conditioning chassis de-icing control method according to claim 5, characterized in that, The initial delay time t for the air conditioner to start up is t = (t min +t max ) / 2.

7. The air conditioning chassis de-icing control method according to claim 5, characterized in that, t min For 5~15 min, t max For 25~50 minutes.

8. The air conditioning chassis de-icing control method according to claim 1, characterized in that, When defrosting mode is enabled, obtain the duration of the current heating mode.

9. An air conditioning system, characterized in that, The air conditioning system is capable of executing the air conditioning chassis de-icing control method according to any one of claims 1 to 8. The air conditioning system includes an indoor heat exchanger, an outdoor heat exchanger, and a compressor. The outdoor heat exchanger is installed on the outdoor chassis, and an electric heating device is installed on the outdoor chassis for heating the outdoor chassis.

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