Snow accumulation prevention control method and device and multi-connected system

Abstract

The application discloses a kind of anti-snow control method, device and multi-connected system.Wherein, the method includes: obtaining snowfall information and cumulative standby duration, to judge whether to meet the triggering condition of anti-snow defrosting mode;After meeting the triggering condition, trigger into anti-snow defrosting mode, execute first defrosting mode and maintain first preset duration;Afterwards, switch to execute second defrosting mode;Wherein, first defrosting mode keeps fan closed, second defrosting mode keeps fan open.The application first enters first defrosting mode when anti-snow defrosting is carried out, which does not open the fan, and the snow attached to the outdoor unit heat exchanger is cleaned by high-temperature exhaust, and then enters second defrosting mode, which cleans the snow in the air field of the air inlet side and the air supply side by starting the fan, to ensure the air field is unobstructed during normal operation of the unit, to eliminate the risk of icing on the heat exchanger caused by snow melting, and to avoid the frequent defrosting risk caused by icing on the heat exchanger when the unit directly operates in heating mode.

Description

Technical Field

[0001] This invention relates to the field of generator set technology, and more specifically, to a snow accumulation control method, device, and multi-unit generator set system. Background Technology

[0002] Currently, multi-split air conditioning systems have many advantages in adapting to complex environments, such as performing admirably in high-altitude and high- and low-temperature regions. However, in high-latitude areas with low temperatures and heavy snowfall, snow may accumulate on the fan blades and surrounding area of ​​the outdoor unit during standby, obstructing airflow and causing abnormal startup of the outdoor unit.

[0003] Current outdoor unit snow accumulation control solutions primarily rely on ambient temperature or linked weather parameters to control fan rotation and remove snow from the blades until the snow is completely cleared. This current solution only programmatically controls snow removal from the fan blades and cannot address snow accumulation around the outdoor unit. In higher latitude regions with heavy snowfall, excessive snow accumulation can obstruct airflow after prolonged standby, causing the unit to frequently enter defrost mode during operation. This increases operating costs, wastes energy, and results in a poor user experience.

[0004] In high-latitude regions with low temperatures and heavy snowfall, excessive snow accumulation around the generating units can affect their normal operation. This can cause units that have been idle for extended periods to frequently enter defrost mode when restarting heating mode. Consequently, the overall defrosting time is prolonged, resulting in energy waste and poor heating comfort.

[0005] There is currently no effective solution to the problem of frequent defrosting in multi-split air conditioning systems under conditions of heavy snow accumulation. Summary of the Invention

[0006] This invention provides a snow control method, device, and multi-unit air conditioning system to solve the problem of frequent defrosting in multi-unit air conditioning systems under conditions of heavy snow accumulation.

[0007] To address the aforementioned technical problems, this invention provides a snow accumulation prevention control method, comprising: acquiring snowfall information and cumulative standby time; determining whether the triggering conditions for a snow accumulation prevention defrosting mode are met based on the snowfall information and the cumulative standby time; after the triggering conditions are met, triggering entry into the snow accumulation prevention defrosting mode, executing a first defrosting mode and maintaining it for a first preset time; subsequently, switching to execute a second defrosting mode; wherein the snow accumulation prevention defrosting mode includes the first defrosting mode and the second defrosting mode, wherein the fan is kept off in the first defrosting mode and the fan is kept on in the second defrosting mode.

[0008] Further, determining whether the triggering conditions for the snow accumulation and defrosting mode are met based on the snowfall information and the cumulative standby time includes: confirming the corresponding minimum preset standby time based on the snowfall information; if the cumulative standby time is ≥ the minimum preset standby time, then it is determined that the triggering conditions for the snow accumulation and defrosting mode are met.

[0009] Furthermore, before executing the first defrosting mode, the method further includes: determining a corresponding first preset duration based on the snowfall information and the cumulative standby time; wherein, a preset correspondence is established between the snowfall information, the cumulative standby time, and the first preset duration.

[0010] Furthermore, the first defrosting mode is executed, including: controlling the start of the compressor and the four-way valve, and controlling the fan to be in the off state.

[0011] Further, switching to the second defrosting mode includes: detecting the current value of each fan and determining the maximum current value maxA and the minimum current value minA of each fan; determining whether the current difference |maxA - minA| is less than a preset deviation; if not, triggering the execution of the second defrosting mode and maintaining it for a second preset duration, and then detecting maxA and minA again until |maxA - minA| is less than the preset deviation; if |maxA - minA| is less than the preset deviation, triggering the execution of the second defrosting mode and maintaining it for a third preset duration.

[0012] Furthermore, after executing the second defrosting mode and maintaining it for a third preset duration, the method further includes: exiting the anti-snow accumulation defrosting mode and entering the normal defrosting mode.

[0013] Furthermore, the second defrosting mode is executed, which includes maintaining the operation of the compressor and the four-way valve, and controlling the activation of each fan.

[0014] The present invention also provides a snow accumulation prevention control device, wherein the device includes: an information acquisition module for acquiring snowfall information and cumulative standby time; a judgment module for judging whether the triggering conditions for a snow accumulation defrosting mode are met based on the snowfall information and the cumulative standby time; and an execution module for triggering entry into the snow accumulation defrosting mode after the triggering conditions are met, executing a first defrosting mode and maintaining it for a first preset time; and then switching to execute a second defrosting mode; wherein the snow accumulation defrosting mode includes the first defrosting mode and the second defrosting mode, wherein the fan is kept off in the first defrosting mode and the fan is kept on in the second defrosting mode.

[0015] The present invention also provides a multi-split air conditioning system, wherein the multi-split air conditioning system includes at least the above-mentioned snow control device.

[0016] The present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the program, when executed by a processor, implements the method as described above.

[0017] The technical solution of this invention provides a snow-proof defrosting mode. First, it enters a first defrosting mode where the fan is off, and the high temperature of the exhaust gas cleans the snow adhering to the outdoor unit's heat exchanger. Then, it enters a second defrosting mode where the fan is activated to clean snow from the air intake and supply sides, ensuring unobstructed airflow during normal unit operation. This eliminates the risk of snow melting and freezing on the heat exchanger, avoiding frequent defrosting caused by melting snow and icing during direct heating operation. It also improves the uniformity of the airflow during unit operation. This shortens the overall heating defrosting time, saves energy, improves the unit's heating effect, and reduces the manual workload of cleaning snow around the outdoor unit in snowy weather. Attached Figure Description

[0018] Figure 1 This is a flowchart of a snow control method according to an embodiment of the present invention;

[0019] Figure 2 This is a detailed flowchart of the snow control method according to an embodiment of the present invention;

[0020] Figure 3 This is a structural block diagram of a snow control device according to an embodiment of the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail 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. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0022] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0023] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0024] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”

[0025] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0026] The optional embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0027] Example 1

[0028] Figure 1 This is a flowchart of a snow control method according to an embodiment of the present invention, such as... Figure 1 As shown, the method includes the following steps:

[0029] Step S101: Obtain snowfall information and cumulative standby time;

[0030] Step S102: Determine whether the triggering conditions for the snow accumulation and defrosting mode are met based on the snowfall information and the cumulative standby time; if yes, proceed to step S103; otherwise, proceed to step S105.

[0031] Step S103: After the triggering condition is met, the anti-snow accumulation defrosting mode is triggered, the first defrosting mode is executed and maintained for the first preset duration;

[0032] Step S104, then switch to execute the second defrosting mode; wherein, the anti-snow accumulation defrosting mode includes the first defrosting mode and the second defrosting mode, the fan is kept off in the first defrosting mode and the fan is kept on in the second defrosting mode;

[0033] Step S105: If the triggering conditions are not met, the system will enter the normal defrosting mode. This normal defrosting mode is the existing conventional defrosting mode, which does not require specific control of the outdoor unit fan. During the operation of the normal defrosting mode, the system controls the refrigerant flow by switching the four-way valve to perform defrosting, and the fan is controlled according to the normal heating mode.

[0034] In this embodiment, the fan is not turned on in the first defrosting mode. The high temperature of the exhaust gas is used to clean the snow attached to the outdoor unit's heat exchanger. When entering the second defrosting mode, the fan is turned on. This can clean the snow on the air intake and air supply sides, ensuring smooth airflow during normal unit operation. It eliminates the risk of snow melting and freezing on the heat exchanger, avoids the risk of frequent defrosting caused by snow melting and freezing on the heat exchanger when the unit is directly heating, and also improves the uniformity of the airflow during unit operation.

[0035] In this embodiment, when setting the trigger conditions for the anti-snow defrosting mode, snowfall information and cumulative standby time are used as reference parameters. For example, taking a dual-fan side-discharge outdoor unit as an example, snowfall information (e.g., light snow, moderate snow, heavy snow, blizzard, etc.) and cumulative standby time S are collected. T is the minimum preset standby time corresponding to the activation of the anti-snow defrosting mode, and T is related to the snowfall amount. Table 1 shows the reference table for the minimum preset standby time T.

[0036] Table 1

[0037]

[0038] It should be noted that T1 > T2 > T3 > T4. Depending on the snowfall, the lighter the snowfall, the longer the minimum preset standby time required to enter the snow-proof defrosting mode. Conversely, if the snowfall is heavy, the minimum preset standby time needs to be reduced. Therefore, based on this embodiment, the minimum preset standby time can be adjusted in real-time or periodically according to the snowfall amount information, thereby ensuring that the snow-proof defrosting mode is triggered at the appropriate and accurate time, avoiding the risk of frequent defrosting caused by melting snow and icing of the heat exchanger during direct heating operation.

[0039] When S≥T (T is the minimum snowfall standby time corresponding to the start of the anti-snow accumulation defrosting mode), the trigger condition is met, and the unit enters the anti-snow accumulation defrosting mode. Otherwise, it enters the normal defrosting mode. For example: S=8h, T=6h, 8h≥6h, then the unit enters the anti-snow accumulation defrosting mode.

[0040] Based on the above description, this embodiment provides a preferred implementation method, which involves determining the corresponding minimum preset standby time based on snowfall information; if the cumulative standby time is greater than or equal to the minimum preset standby time, then the triggering condition for the snow-proof defrosting mode is determined to be met. Based on this, the triggering condition can be adjusted according to weather conditions, thereby ensuring that the snow-proof defrosting mode is executed at the appropriate and accurate time.

[0041] The snow-proof defrosting mode includes a first defrosting mode and a second defrosting mode. After the triggering conditions are met, the first defrosting mode is entered first. In the first defrosting mode, the compressor and the four-way valve are started, and the fan is kept in the off state.

[0042] It should be noted that the duration of the first defrosting mode (the first preset duration, or the fanless defrosting time a) can be determined based on the snowfall information and the cumulative standby time, that is, the corresponding first preset duration is determined based on the snowfall information and the cumulative standby time; there is a preset correspondence between the snowfall information, the cumulative standby time and the first preset duration. Table 2 is a reference table for the values ​​of the fanless defrosting time a.

[0043] Table 2

[0044]

[0045] It should be noted that a1 < a2 < a3 < a4 < a5 < a6 < a7, that is, the longer the cumulative standby time or the more severe the snowfall, the thicker the snow accumulation, and the larger the corresponding value of the defrosting time 'a' without the fan, so as to ensure the best effect of cleaning the snow attached to the outdoor unit heat exchanger by exhaust high temperature.

[0046] After executing the first defrosting mode according to the aforementioned defrosting time 'a' without a fan, the second defrosting mode is switched to. This embodiment's technical solution is applied to multi-split systems with multiple fans (two or more). Simultaneous fan current data for comparison is required to determine the execution duration of the second defrosting mode.

[0047] Specifically, the current value of each fan is measured, and the maximum current value (maxA) and minimum current value (minA) of each fan are determined. The current difference |maxA - minA| is checked to see if it is less than a preset deviation. If not, a second defrosting mode is triggered and maintained for a second preset duration. Then, the current value of each fan is checked again, and maxA and minA are determined until |maxA - minA| is less than the preset deviation. If |maxA - minA| is less than the preset deviation, a second defrosting mode is triggered and maintained for a third preset duration. The specific actions of executing the second defrosting mode include: maintaining the operating state of the compressor and the four-way valve, and controlling the activation of each fan (if it is a dual-fan system, the upper and lower fans are activated).

[0048] After executing the second defrosting mode and maintaining the third preset duration, exit the anti-snow accumulation defrosting mode and enter the normal defrosting mode.

[0049] Figure 2 This is a detailed flowchart of the snow control method according to an embodiment of the present invention, as follows: Figure 2 As shown, the process includes:

[0050] Step S201: Obtain weather information (e.g., snowfall information) and operational information (e.g., cumulative standby time) to determine whether the triggering conditions are met. Specifically, determine the corresponding minimum preset standby time based on the snowfall information. If the cumulative standby time is greater than or equal to the minimum preset standby time, then the triggering conditions for the snow-proof defrosting mode are met.

[0051] Once the triggering conditions are met, the system enters the snow-proof defrosting mode.

[0052] Step S202: Determine the duration 'a' based on weather and operational information. Duration 'a' represents the runtime of the first defrosting mode. Specifically, a pre-defined correspondence between weather information, operational information, and duration 'a' is established.

[0053] Step S203: Execute the first defrosting mode and run for a min (e.g., a is determined to be 5). In this mode, the compressor and four-way valve are started, but the fan is not turned on.

[0054] Step S204, then switch to the second defrosting mode, in which the fan is started and the compressor and four-way valve are kept in operation.

[0055] Step S205: When starting the fan, detect the current value of each fan, determine the maximum current value maxA and the minimum current value minA of each fan, and determine the current difference: maxA - minA;

[0056] Determine whether the current difference | < Δ is true. If yes, proceed to step S207; otherwise, proceed to step S206. Δ is a preset deviation, and its value can be 0.5A (A is the unit of current: ampere).

[0057] Step S206: Execute the second defrosting mode running b min (for example, b is 2), then return to step S205 until the condition |current difference| < Δ is met.

[0058] Step S207: Execute the second defrosting mode and run c min (for example, c is set to 1). The values ​​of b and c are not limited, nor is the relationship between them. They can be set according to actual needs.

[0059] Step S208: Exit the anti-snow defrosting mode and enter the normal defrosting mode.

[0060] In this embodiment, the fan is not turned on in the first defrosting mode. The high temperature of the exhaust gas is used to clean the snow attached to the outdoor unit's heat exchanger. When entering the second defrosting mode, the fan is turned on, which can clean the snow on the air intake and air supply sides, ensuring smooth airflow during normal unit operation, eliminating the risk of snow melting and freezing on the heat exchanger, avoiding the risk of frequent defrosting caused by snow melting and freezing on the heat exchanger when the unit is directly heating, and also improving the uniformity of the airflow during unit operation.

[0061] Example 2

[0062] Corresponding to Figure 1 The snow control method described herein is illustrated in this embodiment, which provides a snow control device, such as... Figure 3 The diagram shown illustrates the structure of a snow control device, which includes:

[0063] Information acquisition module 10 is used to acquire snowfall information and cumulative standby time;

[0064] The judgment module 20 is used to determine whether the triggering conditions of the snow accumulation defrosting mode are met based on the snowfall information and the cumulative standby time.

[0065] The execution module 30 is used to trigger the entry into the anti-snow accumulation defrosting mode after the triggering conditions are met, execute the first defrosting mode and maintain it for a first preset duration; then, switch to execute the second defrosting mode.

[0066] The snow-proof defrosting mode includes a first defrosting mode and a second defrosting mode. In the first defrosting mode, the fan is kept off, and in the second defrosting mode, the fan is kept on.

[0067] The aforementioned device further includes: a determining module, used to determine a corresponding first preset duration based on snowfall information and cumulative standby time before executing the first defrosting mode; wherein, a preset correspondence between snowfall information, cumulative standby time and the first preset duration is established.

[0068] The aforementioned execution module 30 includes: a first execution unit, used to control the start of the compressor and the four-way valve and control the fan to be in the off state when executing the first defrosting mode; and a second execution unit, used to maintain the working state of the compressor and the four-way valve and control the start of the upper fan and the lower fan after switching to the second defrosting mode.

[0069] The aforementioned device further includes: a current detection module, used to detect the current of the upper fan A1 and the current of the lower fan A2 before switching to execute the second defrosting mode, and confirm the current difference between the two fans |A1-A2|; determine whether the current difference between the two fans |A1-A2| is less than a preset deviation; if not, trigger the execution of the second defrosting mode and maintain it for a second preset duration, and then detect the current of the upper fan A1 and the current of the lower fan A2 again until the condition is met: |A1-A2| is less than the preset deviation; if |A1-A2| is less than the preset deviation, trigger the execution of the second defrosting mode and maintain it for a third preset duration.

[0070] The snow control device in this embodiment can clean the snow adhering to the outdoor unit's heat exchanger by exhausting the high temperature without turning on the fan in the first defrosting mode. When entering the second defrosting mode, the fan is turned on, thereby cleaning the snow in the air intake and supply sides of the air field. This ensures smooth airflow during normal unit operation, eliminates the risk of snow melting and freezing on the heat exchanger, avoids the risk of frequent defrosting caused by snow melting and freezing of the heat exchanger when the unit is directly heating, and also improves the uniformity of the air field during unit operation.

[0071] This embodiment also provides a multi-split air conditioning system, wherein the multi-split air conditioning system includes at least the above-mentioned snow control device.

[0072] Example 3

[0073] This invention provides software for executing the technical solutions described in the above embodiments and preferred embodiments.

[0074] This invention provides a non-volatile computer storage medium storing computer-executable instructions that can execute the snow control method in any of the above-described method embodiments.

[0075] The aforementioned storage medium stores the aforementioned software, and the storage medium includes, but is not limited to, optical discs, floppy disks, hard disks, and rewritable memory.

[0076] The above-described product can execute the method provided in the embodiments of the present invention, and has the corresponding functional modules and beneficial effects for executing the method. Technical details not described in detail in this embodiment can be found in the method provided in the embodiments of the present invention.

[0077] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0078] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preventing snow accumulation, characterized in that, The method includes: Obtain snowfall information and cumulative standby time, and determine whether the triggering conditions for the snow accumulation and defrosting mode are met based on the snowfall information and the cumulative standby time; After the triggering conditions are met, the system will enter the snow-proof defrosting mode, execute the first defrosting mode, and maintain it for the first preset duration. Then, switch to the second defrosting mode, which includes: detecting the current value of each fan and determining the maximum current value maxA and the minimum current value minA of each fan; determining whether the current difference |maxA - minA| is less than a preset deviation; if not, triggering the execution of the second defrosting mode and maintaining it for a second preset duration, and then detecting maxA and minA again until |maxA - minA| is less than the preset deviation; if |maxA - minA| is less than the preset deviation, triggering the execution of the second defrosting mode and maintaining it for a third preset duration. The snow-proof defrosting mode includes a first defrosting mode and a second defrosting mode. In the first defrosting mode, the fan is kept off, and in the second defrosting mode, the fan is kept on.

2. The method according to claim 1, characterized in that, Based on the snowfall information and the cumulative standby time, determine whether the triggering conditions for the snow accumulation and defrosting mode are met, including: The corresponding minimum preset standby time is determined based on the snowfall information; If the cumulative standby time is greater than or equal to the minimum preset standby time, then the triggering condition for the snow defrosting mode is determined to be met.

3. The method according to claim 1, characterized in that, Before executing the first defrosting mode, the method further includes: A first preset duration is determined based on the snowfall information and the cumulative standby time; wherein, a preset correspondence is established between the snowfall information, the cumulative standby time, and the first preset duration.

4. The method according to claim 1, characterized in that, Execute the first defrost mode, including: Controls the start of the compressor and the four-way valve, and controls the fan to be in the off state.

5. The method according to claim 1, characterized in that, After executing the second defrosting mode and maintaining it for the third preset duration, the method further includes: Exit the anti-snow defrosting mode and enter the normal defrosting mode.

6. The method according to claim 1, characterized in that, Execute the second defrost mode, including: Maintain the operation of the compressor and the four-way valve, and control the activation of each fan.

7. A snow control device, characterized in that, The device includes: The information acquisition module is used to acquire snowfall information and cumulative standby time; The judgment module is used to determine whether the triggering conditions of the snowfall prevention and defrosting mode are met based on the snowfall information and the cumulative standby time. The execution module is configured to, upon meeting the triggering conditions, trigger entry into the snow-proof defrosting mode, execute the first defrosting mode and maintain it for a first preset duration; then, switch to execute the second defrosting mode, which includes: detecting the current value of each fan and determining the maximum current value maxA and the minimum current value minA of each fan; determining whether the current difference |maxA - minA| is less than a preset deviation; if not, trigger execution of the second defrosting mode and maintain it for a second preset duration, then detect maxA and minA again until |maxA - minA| is less than the preset deviation; if |maxA - minA| is less than the preset deviation, trigger execution of the second defrosting mode and maintain it for a third preset duration. The snow-proof defrosting mode includes a first defrosting mode and a second defrosting mode. In the first defrosting mode, the fan is kept off, and in the second defrosting mode, the fan is kept on.

8. A multi-split air conditioning system, characterized in that, The multi-unit system includes at least the snow control device as described in claim 7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method as described in any one of claims 1 to 6.

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