WO2020228331A1

WO2020228331A1 - Water pump control method and system, and air conditioner

Info

Publication number: WO2020228331A1
Application number: PCT/CN2019/127436
Authority: WO
Inventors: 杨林; 林义凯; 张辉; 薛寒冬; 傅英胜
Original assignee: 珠海格力电器股份有限公司
Priority date: 2019-05-16
Filing date: 2019-12-23
Publication date: 2020-11-19
Also published as: CN110131145B; CN110131145A

Abstract

A water pump control method, a water pump control system, an air conditioner, and a computer readable storage medium. The control method comprises: detecting the current environment temperature at which an outdoor unit works; predicting a shortest freezing time of a drain pipe where a water pump is located at the current environment temperature under the condition that the current environment temperature is lower than a preset temperature value; determining a maximum switch-on time of the water pump according to a prediction value of the shortest freezing time; and enabling the water pump to be intermittently switched on for drainage, the switch-on time of the water pump each time being less than the maximum switch-on time. According to the control method, by controlling the switch-on time of the water pump, condensed water can be completely drained before being freezing in the drain pipe, thus preventing the drain pipe from being frozen when the environment temperature is low so as to ensure smooth drainage.

Description

Water pump control method, system and air conditioner

This disclosure is based on a Chinese application with an application number of 201910405987.8 and a filing date of May 16 , 2019 , and claims its priority. The disclosure of the Chinese application is hereby incorporated into this disclosure as a whole.

Technical field

The present disclosure relates to the field of air conditioner control technology, in particular to a water pump control method, system and air conditioner.

Background technique

With the improvement of people’s living conditions, air conditioners are the main equipment for air conditioning, and places where air conditioners are installed are becoming more common. The condensate produced by heat pump air conditioners for heating or defrosting known to the inventor is directly discharged through the air conditioner chassis to flow outdoors. To process. However, in some specific occasions, the condensate produced by heat pump air conditioning heating or defrosting cannot flow away directly through the drain holes of the chassis, and needs to be sent to specific occasions.

Summary of the invention

According to an aspect of the present disclosure, a water pump control method is provided, including:

Detect the current ambient temperature;

When the current ambient temperature is lower than the preset temperature value, predict the shortest freezing time of the drain pipe where the water pump is located at the current ambient temperature;

Determine the maximum opening time of the pump according to the predicted value of the shortest freezing time;

The water pump is turned on intermittently for drainage, and the opening time of the water pump each time is less than the maximum opening time.

In some embodiments, the maximum opening time is consistent with the predicted value of the shortest icing time; or the maximum opening time is equal to the predicted value of the shortest icing time multiplied by a preset coefficient, and the preset coefficient is less than 1.

In some embodiments, the step of predicting the shortest freezing time of the drain pipe at the current ambient temperature specifically includes:

Determine the temperature range of the current ambient temperature;

According to the mapping relationship between the preset temperature interval and the shortest freezing time, the shortest freezing time corresponding to the temperature interval in which the current ambient temperature is located is determined.

In some embodiments, the step of presetting the mapping relationship between the temperature interval and the shortest freezing time specifically includes:

Select the lower boundary temperature point of a specific temperature interval;

The shortest icing time corresponding to the lower boundary temperature point is predicted as the shortest icing time in a specific temperature range.

In some embodiments, the temperature interval in which the current ambient temperature is located is the first temperature interval, and the water pump control method further includes:

Predict the shortest icing time in the second temperature interval as the minimum opening time of the water pump, and the opening time of the water pump each time is between the minimum opening time and the maximum opening time;

Wherein, the second temperature interval is adjacent to the first temperature interval and is lower than the first temperature interval as a whole.

In some embodiments, the step of predicting the shortest freezing time of the drainage pipe at a specific ambient temperature specifically includes:

The shortest icing time is calculated according to a preset prediction model of the shortest icing time. The input of the prediction model includes: the current ambient temperature, the inner diameter of the drain pipe and the water flow speed.

In some embodiments, the prediction model of the shortest freezing time is:

t _max =(a*D ² +b*U+c*T)*d,

Among them, t _max is the shortest freezing time, a, b, c, and d are constants, D is the inner diameter of the drain pipe, U is the water flow velocity, and T is the current ambient temperature.

In some embodiments, the water pump control method further includes:

Determine whether the current ambient temperature is lower than the preset temperature value, and if it is not lower, the water pump is kept on.

In some embodiments, the drain pipe is configured to discharge water generated by the outdoor unit of the air conditioner, the water pump is configured to provide power for discharging the water generated by the outdoor unit of the air conditioner, and the water pump control method further includes:

Determine whether the air conditioner is in heating or defrosting conditions. If it is not in heating or defrosting conditions, keep the water pump off. If it is in heating or defrosting conditions, determine the relationship between the current ambient temperature and the preset temperature.

In some embodiments, the water pump control method further includes:

Determine the closing time of the pump. Under the same ambient temperature, the closing time is greater than the opening time.

According to another aspect of the present disclosure, a water pump control system is provided, including:

The temperature detection component is configured to detect the current ambient temperature;

The start-stop time determination module is configured to predict the shortest freezing time of the drain pipe where the water pump is located at the current ambient temperature when the temperature detection component detects that the current ambient temperature is lower than the preset temperature value, and based on the shortest freezing time The predicted value of time determines the maximum opening time of the pump; and

The start-stop control module is configured to make the water pump open intermittently for drainage, and the open time of the water pump each time is less than the maximum open time.

In some embodiments, the start-stop time determination module includes:

The temperature interval judging unit is configured to determine the temperature interval in which the current ambient temperature is located; and

The opening time determining unit is configured to determine the shortest icing time corresponding to the temperature interval in which the current ambient temperature is located according to the mapping relationship between the preset temperature interval and the shortest icing time.

In some embodiments, the start-stop time determination module includes:

The opening time determining unit is configured to calculate the shortest icing time according to the prediction model. The input of the prediction model includes: current ambient temperature, inner diameter of the drain pipe, and water flow speed.

In some embodiments, the start-stop control module is configured to keep the water pump on when the current ambient temperature is not lower than the preset temperature value.

In some embodiments, the drain pipe is configured to discharge the water generated by the outdoor unit of the air conditioner, the water pump is configured to provide power for discharging the water generated by the outdoor unit of the air conditioner, and the start-stop control module is configured to discharge the water generated by the outdoor unit of the air conditioner. Keep the water pump off during frost conditions.

In some embodiments, the start-stop time determination module is further configured to determine the shutdown time of the water pump. Under the same ambient temperature, the shutdown time is greater than the opening time.

According to another aspect of the present disclosure, an air conditioner is provided, including the water pump control system of the outdoor unit of the air conditioner of the above-mentioned embodiment.

Memory; and

A processor coupled to the memory, and the processor is configured to execute the water pump control method of the foregoing embodiment based on instructions stored in the memory.

According to another aspect of the present disclosure, a computer-readable storage medium is provided, on which computer program instructions are stored, and when the instructions are executed by a processor, the steps of the water pump control method of the above-mentioned embodiment are realized.

Description of the drawings

The drawings described here are used to provide a further understanding of the present disclosure and constitute a part of the present application. The exemplary embodiments of the present disclosure and their descriptions are used to explain the present disclosure, and do not constitute an improper limitation of the present disclosure. In the attached picture:

FIG. 1 is a schematic flowchart of some embodiments of the disclosed water pump control method;

2 is a schematic flowchart of other embodiments of the disclosed water pump control method;

3 is a schematic flowchart of some specific embodiments of the disclosed water pump control method;

Figure 4 is a schematic flow diagram of some embodiments of determining the maximum opening time according to the temperature interval in the water pump control method of the present disclosure;

Figure 5 is a schematic diagram of the module composition of some embodiments of the disclosed water pump control system;

FIG. 6 is a schematic diagram of the module composition of other embodiments of the water pump control system of the disclosure;

FIG. 7 is a schematic diagram of the module composition of still other embodiments of the water pump control system of the disclosure.

Detailed ways

The present disclosure is explained in detail below. In the following paragraphs, different aspects of the embodiments are defined in more detail. The aspects so defined can be combined with any other aspect or aspects, unless it is clearly indicated that they cannot be combined. In particular, any feature considered to be preferred or advantageous may be combined with one or more other features considered to be preferred or advantageous.

In the related technology known to the inventor, the condensed water generated by the heat pump air conditioner heating or defrosting does not directly flow away through the drain hole of the chassis, and needs to be sent to a specific occasion. When the ambient temperature is low (for example, below zero), the drain pipe is easy to freeze and block the drain pipe, causing it to not drain properly.

In view of this, the present disclosure proposes a water pump control method, system and air conditioner, which can realize normal drainage when the ambient temperature is low. First of all, the present disclosure proposes a water pump control method, which will be referred to as "control method" in the following. This control method is used for the control of the water pump of the outdoor unit of the air conditioner or the control of the water pump in any other field equipment. The subsequent embodiments are described by taking the control of the water pump of the outdoor unit of the air conditioner as an example.

The water pump control method of the embodiment of the present disclosure detects the current ambient temperature, and predicts the shortest freezing time according to the current ambient temperature when the current ambient temperature is lower than the preset temperature value, and thereby determines the maximum opening time of the water pump, So that the water pump is opened and closed intermittently, and each opening time is less than the maximum opening time. This control method can completely drain the water before freezing in the drainage pipe by controlling the opening time of the water pump, preventing the drainage pipe from freezing when the ambient temperature is low, and ensuring smooth drainage.

In some embodiments, as shown in the schematic flowchart of FIG. 1, the control method includes:

Step 101: Detect the current ambient temperature in which the outdoor unit is working, for example, through a temperature detection component;

Step 102: When the current ambient temperature is lower than the preset temperature value, predict the shortest freezing time of the drain pipe where the water pump is located at the current ambient temperature;

Step 103: Determine the maximum opening time of the water pump according to the predicted value of the shortest freezing time;

Step 104: The water pump is turned on intermittently for drainage, and the opening time of the water pump each time is less than the maximum opening time.

Among them, in some embodiments, step 101 is executed in real time during the working process of equipment such as an outdoor unit of an air conditioner, and steps 102 to 104 are executed sequentially after the current ambient temperature is detected. The preset temperature value in step 102 is the ambient temperature that will cause the drainage pipe to freeze, such as 0°C; in some embodiments, the shortest freezing time at the current ambient temperature is based on model predictions, or experimental or empirical data is stored in Look-up table prediction is performed in the controller. In step 104, the water pump is turned on and off at intervals, and the opening time each time is less than the maximum opening time determined according to the predicted value of the shortest icing time, which can not only discharge the water intermittently, but also prevent the continuous flow of water in the drain pipe from freezing. The lower the temperature, the shorter the maximum open time.

This control method can completely drain the water before freezing in the drainage pipe by controlling the opening time of the water pump, preventing the drainage pipe from freezing when the ambient temperature is low, and ensuring smooth drainage.

When this control method is used to control the water pump of the outdoor unit of an air conditioner, for example, the temperature detection component is installed in the outdoor unit or the drain pipe, and the current environment of the outdoor unit is detected when the air conditioner is in heating or defrosting conditions. When the current ambient temperature is lower than the preset temperature value, predict the shortest icing time based on the current ambient temperature, and determine the maximum opening time of the pump from this, so that the pump can be turned on and off intermittently, and the opening time is less than Maximum opening time. This control method can completely drain the condensed water before freezing in the drain pipe by controlling the opening time of the water pump, prevent the drain pipe from freezing when the ambient temperature is low, and ensure the smooth drainage of the outdoor unit.

In step 103 of this embodiment, the maximum opening time is consistent with the predicted value of the shortest freezing time. This method can simplify the control logic and make the opening and closing response of the water pump more sensitive. Or the maximum open time is equal to the predicted value of the shortest icing time multiplied by the preset coefficient, which is less than 1. This method takes into account temperature detection, temperature detection components to transmit the detection data to the outdoor unit controller, controller prediction calculation, etc. The time delay caused by the link makes the maximum opening time slightly shorter than the shortest icing time of the drain pipe, which can further prevent the drain pipe from freezing due to detection errors and control delays, and keep the water flow in the drain pipe smooth.

In some embodiments, in step 102, as shown in the schematic flowchart of FIG. 2, the step of predicting the shortest freezing time of the drain pipe at the current ambient temperature specifically includes:

Step 201: Determine the temperature range in which the current ambient temperature is located; for example, the temperature range below the preset temperature value is divided into multiple temperature ranges, and the length of each temperature range is the same or different, and the length of the temperature range is determined according to the requirements of drainage control accuracy , Such as 1°C, 2°C, 3°C, 4°C or 5°C, etc.;

Step 202: According to the mapping relationship between the preset temperature interval and the shortest icing time, determine the shortest icing time corresponding to the temperature interval in which the current ambient temperature is located.

Among them, steps 201 and 202 are executed sequentially. In some embodiments, the mapping relationship between the temperature interval and the shortest icing time is obtained through data accumulated during experiments or use, or through model calculation, and the mapping relationship is pre-stored in the outdoor unit controller. After determining the temperature range of the current ambient temperature in step 201, the shortest icing time is directly obtained by looking up the table, and the maximum opening time of the water pump is determined accordingly.

This embodiment divides the opening time of the water pump into multiple different gears according to the temperature range, and does not need to re-determine the maximum opening time of the water pump for each ambient temperature value, which can reduce the control difficulty and improve the response speed.

In this embodiment, the step of presetting the mapping relationship between the temperature interval and the shortest freezing time specifically includes:

Select the lower boundary temperature point of a specific temperature interval, the lower boundary temperature point is lower than the upper boundary temperature point;

Since the minimum freezing time decreases with the decrease of the ambient temperature, this method uses the minimum freezing time at the lower boundary temperature point as the shortest freezing time in the specific temperature range, which is equivalent to tightening the working temperature conditions of the outdoor unit. Determining the maximum opening time can prevent freezing during the opening of the pump.

In some embodiments, the shortest freezing time at the midpoint of the temperature interval or at any point is taken as the shortest freezing time in the specific temperature interval.

After determining the maximum open time of the water pump, in order to avoid the frequent start and stop of the water pump affecting the life and improve the drainage efficiency, the minimum open time of the water pump can also be determined. In some embodiments, the temperature interval in which the current ambient temperature is located is the first temperature interval, and the control method further includes:

Step 203: Predict the shortest icing time in the second temperature interval, as the minimum opening time of the water pump, and the opening time of the water pump each time is between the minimum opening time and the maximum opening time; wherein, the second temperature interval is the same as the first temperature interval. It is adjacent and overall lower than the first temperature range. This step is not shown in the figure.

For example, when the ambient temperature is -10℃≤T＜-5℃, the maximum opening time is t2, and the opening time of each pump is t＜t2; when the ambient temperature is -5℃≤T＜0℃, the maximum opening time is t1 , And t1>t2, the opening time t2<t<t1 of each pump.

In this embodiment, the opening time of the water pump is divided into multiple different gears according to the temperature interval, the maximum opening time of the water pump is determined according to the first temperature interval in which the current ambient temperature is located, and the minimum opening time of the water pump is determined according to the adjacent second temperature interval Time can not only prevent freezing during the drainage process, but also prevent the frequent start and stop of the water pump from affecting the life, and improve the drainage efficiency.

In some other embodiments, the step of predicting the shortest freezing time of the drain pipe at a specific ambient temperature specifically includes:

The current ambient temperature, the inner diameter of the drain pipe and the water flow speed will all affect the minimum freezing time of the drain pipe. The shortest freezing time is positively correlated with the current ambient temperature, the inner diameter of the drain pipe and the water flow speed. When the current ambient temperature is a negative value, Directly bring the negative value into the prediction model for calculation. The lower the current ambient temperature, the smaller the inner diameter of the drain pipe, and the slower the water flow speed, the easier it is to freeze. It is necessary to set the maximum drain time to a smaller value.

For a specific outdoor unit, the inner diameter of the drain pipe and the water flow speed have been determined in the design stage. The water flow speed is determined according to the working parameters of the pump, and only the current ambient temperature is used as the variable to determine the maximum open time. For different outdoor units, the inner diameter of the drain pipe and the water flow speed are different.

This embodiment can more accurately predict the shortest freezing time under the current ambient temperature by monitoring the current ambient temperature and obtaining the inner diameter of the drain pipe and the water flow speed, thereby determining the maximum opening time of the water pump. The drain pipe of the outdoor unit is easy to freeze and cause the problem of inability to drain water.

In some embodiments, the prediction model of the shortest freezing time is:

t _max =(a*D ² +b*U+c*T)*d,

Since the shortest icing time is proportional to the cross-sectional area of the inner wall of the drain pipe, it has a quadratic relationship with the inner diameter of the drain pipe, and at the same time is proportional to the water flow velocity and the ambient temperature. The various constants in the prediction model can be determined and combined based on experiments. Adjustment. In some embodiments, after the shortest icing time is calculated, the coefficient d is multiplied as needed to adjust the overall value.

In some embodiments, as shown in the schematic flow chart shown in FIG. 3, when the air conditioner is in heating or defrosting conditions, after step 101 is performed, the control method of the present disclosure further includes:

Step 105: Determine whether the current ambient temperature is lower than the preset temperature value, if it is lower, perform steps 102 to 104, and if it is not lower, perform step 106;

Step 106: Keep the water pump turned on.

When the outdoor environment temperature is high, when the air conditioner is in heating or defrosting conditions, the condensed water can be discharged smoothly, or transported to a specific occasion, without freezing, so it allows the water pump to be continuously turned on, which not only simplifies the control In this way, the drainage efficiency can be improved, the heat exchanger of the outdoor unit can be prevented from being soaked by condensate water, and the heat exchange efficiency of the heat exchanger can be improved.

In some embodiments, as shown in the schematic flow chart shown in FIG. 3, the drain pipe is used to discharge the water generated by the outdoor unit of the air conditioner, and the water pump is used to provide power for the water generated by the outdoor unit of the air conditioner. The control method of the present disclosure further includes:

Step 107: Judge whether the air conditioner is in heating or defrosting mode, if yes, go to step 105, and if it is not in heating or defrosting mode, go to step 108;

Step 108: Keep the water pump turned off.

In this embodiment, by judging the working condition of the air conditioner, the water pump is turned on under the working condition of producing condensed water and shut off under the cooling working condition, which can reduce the energy consumption of the entire air conditioner.

In some embodiments, the control method of the present disclosure further includes:

Since the water pump is turned on intermittently, the closing time of the water pump is longer than the opening time, which is beneficial to dissolve the ice on the chassis of the unit. During the time period when the water pump is turned off, the condensate discharged from the outdoor unit accumulates in the chassis. Will start to drain again.

In some embodiments, the closing time is twice the opening time, which can more fully melt the ice on the chassis of the unit, so that the water can be discharged smoothly when the water pump is turned on next time. In other embodiments, the closing time of the water pump is less than the opening time.

In some embodiments, taking the water pump control of the outdoor unit of an air conditioner as an example, as shown in FIG. 4, the water pump control method of the present disclosure is as follows:

1. Determine whether the air conditioner is currently in heating or defrosting conditions. If it is not in heating or defrosting conditions, keep the water pump of the outdoor unit closed;

2. If the air conditioner is currently in heating or defrosting conditions, the current ambient temperature T is detected by the temperature detection component, and it is further judged whether the current ambient temperature is lower than the preset temperature (for example, 0℃), if the current ambient temperature T≥ At 0℃, keep the water pump on;

3. If the current ambient temperature T<0°C, the water pump is turned on intermittently for drainage, and the start and stop time is selected according to different temperature ranges:

When the ambient temperature is -5℃≤T＜0℃, each opening time t＜t1, and the closing time is 2t; when the environment temperature -10℃≤T＜-5℃, each opening time t＜t2, the closing time When the ambient temperature is -15℃≤T＜-10℃, each opening time t＜t3, and the closing time is 2t; when the environment temperature -20℃≤T＜-15℃, each opening time t＜ t4, the closing time is 2t; when the ambient temperature T<-20°C, each opening time t<t5, the closing time is 2t.

Among them, t1, t2, t3, t4, and t5 are the corresponding maximum opening times of the water pump in each temperature interval, t1>t2>t3>t4>t5. For example, each maximum opening time is predetermined and stored in the controller. After the current ambient temperature is detected, the maximum opening time is determined according to the mapping relationship between the maximum opening time and the temperature interval.

In some embodiments, the water pump control method of the present disclosure is as follows:

1. Obtain the inner diameter D of the drain pipe of the outdoor unit of the air conditioner, the water flow speed U in the drain pipe, and the current ambient temperature T;

2. Determine whether the air conditioner is currently in heating or defrosting conditions. If it is not in heating or defrosting conditions, keep the water pump of the outdoor unit closed;

3. If the air conditioner is currently in heating or defrosting conditions, it is further judged whether the current ambient temperature is lower than the preset temperature (for example, 0°C), and if the current ambient temperature T≥0°C, the water pump is kept on;

4. If the current ambient temperature T<0°C, the water pump is turned on intermittently for drainage, and the start and stop time is selected according to different temperature ranges:

When the ambient temperature is -5°C≤T<0°C, each turn-on time t1=(a*D ² +b*U+c*T)*d, and the turn-off time is t2=f*t1;

When the ambient temperature is -10℃≤T＜-5℃, each turn-on time t3=(a*D ² +b*U+c*T)*d, and the turn-off time is t4=f*t3;

When the ambient temperature is -15℃≤T＜-10℃, each turn-on time t5=(a*D ² +b*U+c*T)*d, and the turn-off time is t6=f*t5;

When the ambient temperature is -20℃≤T＜-15℃, each opening time t7=(a*D ² +b*U+c*T)*d, and closing time t8=f*t7;

When the ambient temperature T<-20°C, each turn-on time t9=(a*D ² +b*U+c*T)*d, and the turn-off time is t10=f*t9.

Among them, a, b, c, d and f are constants and adjusted according to different situations. f is related to the head according to the specific drainage mode designed by the outdoor unit, and f is positively related to the pump head. These constants are pre-determined and stored in the controller to establish a first functional relationship between the opening time of the pump and the inner diameter of the drain pipe D, water flow speed and the current ambient temperature, and a second functional relationship between the closing time and the opening time of the pump. The opening time and closing time of the water pump are determined at any time during the working process of the air conditioner.

Secondly, the present disclosure also provides a water pump control system. In some embodiments, as shown in FIG. 5, this control system includes: a temperature detection component 10 for detecting the current ambient temperature; a start-stop time determination module 11, It is used to predict the shortest icing time of the drainage pipe where the water pump is located at the current ambient temperature when the temperature detection component 10 detects that the current ambient temperature is lower than the preset temperature value, and determine the pump's performance based on the predicted value of the shortest icing time Maximum opening time; and start-stop control module 12, used to make the water pump open intermittently for drainage, and the opening time of the water pump each time is less than the maximum opening time.

When applied to an outdoor unit of an air conditioner, the temperature detection component 10 is used to detect the current ambient temperature of the outdoor unit; the start-stop time determination module 11 is used to predict the shortest freezing time of the drain pipe of the outdoor unit at the current ambient temperature; The stop control module 12 is used to make the water pump open for drainage when the air conditioner is in heating or defrosting work.

This kind of control system can completely drain the condensate before freezing in the drain pipe by controlling the opening time of the water pump, preventing the drain pipe from freezing when the ambient temperature is low, and ensuring the smooth drainage of the outdoor unit under heating and defrosting conditions.

In some embodiments, the start-stop time determination module 11 includes: a temperature interval judging unit, configured to determine the temperature interval in which the current ambient temperature is located; and an on-time determining unit, configured based on the preset temperature interval and the shortest icing time The mapping relationship of, determines the shortest freezing time corresponding to the temperature range of the current ambient temperature.

In other embodiments, the start-stop time determining module 11 includes: an open time determining unit for calculating the shortest icing time according to the prediction model. The input of the prediction model includes: the current ambient temperature, the inner diameter of the drain pipe, and the water flow speed.

In some embodiments, the start-stop control module 11 is used to continuously turn on the water pump when the air conditioner is heating or defrosting and the current ambient temperature is not lower than the preset temperature value. When the outdoor environment temperature is high, when the air conditioner is in heating or defrosting conditions, the condensed water can be discharged smoothly, or transported to specific occasions, without freezing, so the water pump can be continuously turned on, which not only simplifies the control In this way, the drainage efficiency can be improved, the heat exchanger of the outdoor unit can be prevented from being soaked by condensate water, and the heat exchange efficiency of the heat exchanger can be improved.

Or the start-stop control module 11 is used to keep the water pump off when the air conditioner is not in heating or defrosting conditions. By judging the working condition of the air conditioner, the water pump can be turned on only under the working condition of producing condensate, and closed under the cooling working condition, thereby reducing the energy consumption of the entire air conditioner.

In some embodiments, the start-stop time determining module is also used to determine the closing time of the water pump. Under the same ambient temperature, the closing time is greater than the opening time and greater than the opening time. Since the water pump is turned on intermittently, the closing time of the water pump is longer than the opening time, which is beneficial to dissolve the ice on the chassis of the unit. During the time period when the water pump is turned off, the condensate discharged from the outdoor unit accumulates in the chassis. Will start to drain again.

Thirdly, the present disclosure also provides an air conditioner including the water pump control system of the above-mentioned embodiment. This type of air conditioner can completely drain the condensed water before freezing in the drain pipe by controlling the opening time of the water pump under heating or defrosting conditions, preventing the drain pipe from freezing when the ambient temperature is low, and ensuring that the outdoor unit is heating Smooth drainage under defrosting conditions.

Fig. 6 is a schematic structural diagram of other embodiments of the water pump control system of the disclosure. The control system includes a memory 20 and a processor 21. Wherein: the memory 20 is a magnetic disk, flash memory or any other non-volatile storage medium. The memory is used to store instructions in the embodiments corresponding to Figs. 1 to 5. The processor 21 is coupled to the memory 20 and implemented as one or more integrated circuits, such as a microprocessor or a microcontroller. The processor 21 is used to execute instructions stored in the memory.

In other embodiments, as shown in FIG. 7, the antifreeze water pump control system for the drain pipe of the outdoor unit of the air conditioner includes a memory 20 and a processor 21. The processor 21 is coupled to the memory 20 through the BUS bus 22. The anti-freezing water pump control system for the drain pipe of the outdoor unit of the air conditioner is also connected to an external storage device 25 through the storage interface 23 to recall external data, or connected to the network or another computer system (not shown) through the network interface 24. No more detailed introduction here.

In still other embodiments, a computer-readable storage medium has computer program instructions stored thereon, and when the instructions are executed by a processor, the steps of the method in the embodiments corresponding to FIGS. 1 to 5 are implemented. Those skilled in the art should understand that the embodiments of the present disclosure are applicable to methods, devices, or computer program products. Therefore, the present disclosure includes forms that adopt complete hardware embodiments, complete software embodiments, or embodiments combining software and hardware. Moreover, the present disclosure adopts the form of a computer program product implemented on one or more computer-usable non-transitory storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

In addition, the present disclosure also provides an air conditioner, including the antifreeze water pump control system for the drain pipe of the outdoor unit of the air conditioner described in the above embodiment.

The above describes in detail a water pump control method, system and air conditioner provided by the present disclosure. Specific examples are used in this article to describe the principles and implementations of the present disclosure. The description of the above examples is only used to help understand the methods and core ideas of the present disclosure. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of the present disclosure, several improvements and modifications can be made to the present disclosure, and these improvements and modifications also fall within the protection scope of the claims of the present disclosure.

Claims

A water pump control method, including:

Detect the current ambient temperature;

When the current ambient temperature is lower than the preset temperature value, predict the shortest freezing time of the drain pipe where the water pump is located at the current ambient temperature;

Determining the maximum opening time of the water pump according to the predicted value of the shortest freezing time;

The water pump is turned on intermittently to discharge water, and the opening time of the water pump each time is less than the maximum opening time.
The water pump control method according to claim 1, wherein:

The maximum opening time is consistent with the predicted value of the shortest freezing time; or

The maximum opening time is equal to the predicted value of the shortest icing time multiplied by a preset coefficient, and the preset coefficient is less than one.
The water pump control method according to claim 1, wherein the step of predicting the shortest freezing time of the drain pipe at the current ambient temperature specifically comprises:

Determine the temperature range of the current ambient temperature;

According to the mapping relationship between the preset temperature interval and the shortest freezing time, the shortest freezing time corresponding to the temperature interval in which the current ambient temperature is located is determined.
The water pump control method according to claim 3, wherein the step of presetting the mapping relationship between the temperature interval and the shortest icing time specifically comprises:

Select the lower boundary temperature point of a specific temperature interval;

The shortest icing time corresponding to the lower boundary temperature point is predicted as the shortest icing time of the specific temperature interval.
3. The water pump control method according to claim 3, wherein the temperature interval in which the current ambient temperature is located is the first temperature interval, and the water pump control method further comprises:

Predicting the shortest icing time in the second temperature interval as the minimum opening time of the water pump, and each opening time of the water pump is between the minimum opening time and the maximum opening time;

Wherein, the second temperature interval is adjacent to the first temperature interval and is lower than the first temperature interval as a whole.
The water pump control method according to claim 1, wherein the step of predicting the shortest freezing time of the drain pipe at a specific ambient temperature specifically comprises:

The shortest icing time is calculated according to a preset shortest icing time prediction model, and the input of the prediction model includes: current ambient temperature, inner diameter of the drain pipe, and water flow velocity.
The water pump control method according to claim 6, wherein the prediction model of the shortest freezing time is:

t max =(a*D 2 +b*U+c*T)*d,

Among them, t max is the shortest freezing time, a, b, c, and d are constants, D is the inner diameter of the drain pipe, U is the water flow velocity, and T is the current ambient temperature.
The water pump control method according to claim 1, further comprising:

It is determined whether the current ambient temperature is lower than the preset temperature value, and if it is not lower than, the water pump is continuously turned on.
The water pump control method according to claim 1, wherein the drain pipe is used to discharge water generated by the outdoor unit of the air conditioner, and the water pump is used to provide power to discharge the water generated by the outdoor unit of the air conditioner, and the water pump control method further comprises:

Determine whether the air conditioner is in heating or defrosting conditions. If it is not in heating or defrosting conditions, keep the water pump turned off. If it is in heating or defrosting conditions, determine whether the current ambient temperature is different from the preset temperature. relationship.
The water pump control method according to claim 1, further comprising:

Determine the closing time of the water pump. Under the same ambient temperature, the closing time is greater than the opening time.
A water pump control system includes:

The temperature detection component is configured to detect the current ambient temperature;

The start-stop time determination module is configured to predict the shortest freezing time of the drain pipe where the water pump is located at the current ambient temperature when the temperature detection component detects that the current ambient temperature is lower than the preset temperature value, and Determine the maximum opening time of the water pump according to the predicted value of the shortest freezing time; and

The start-stop control module is configured to enable the water pump to be turned on intermittently for drainage, and the opening time of the water pump each time is less than the maximum opening time.
The water pump control system according to claim 11, wherein the start-stop time determination module comprises:

The temperature interval judging unit is configured to determine the temperature interval in which the current ambient temperature is located; and

The opening time determining unit is configured to determine the shortest icing time corresponding to the temperature interval in which the current ambient temperature is located according to the mapping relationship between the preset temperature interval and the shortest icing time.
The water pump control system according to claim 11, wherein the start-stop time determination module comprises:

The opening time determining unit is configured to calculate the shortest icing time according to the prediction model;

Wherein, the input of the prediction model includes: the current ambient temperature, the inner diameter of the drain pipe, and the water flow velocity.
The water pump control system according to claim 11, wherein the start-stop control module is configured to keep the water pump on when the current ambient temperature is not lower than the preset temperature value.
The water pump control system according to claim 11, wherein the drain pipe is configured to discharge water generated by the outdoor unit of the air conditioner, the water pump is configured to discharge water generated by the outdoor unit of the air conditioner to provide power, and the start-stop control module is It is configured to keep the water pump closed when the air conditioner is not in a heating or defrosting condition.
The water pump control system according to claim 11, wherein the start-stop time determining module is further configured to determine the closing time of the water pump, and the closing time is greater than the opening time under the same ambient temperature.
An air conditioner, comprising the water pump control system according to any one of claims 11-16.
A water pump control system includes:

Memory; and

A processor coupled to the memory, and the processor is configured to execute the water pump control method according to any one of claims 1 to 10 based on instructions stored in the memory.
A computer-readable storage medium having computer program instructions stored thereon, which when executed by a processor, realizes the water pump control method according to any one of claims 1-10.