Air conditioning unit defrosting method and device, air conditioning unit and readable storage medium

Abstract

The invention provides an air conditioning unit defrosting method and device, an air conditioning unit and a readable storage medium, and the method comprises the steps that a defrosting mode is triggered, and the heating state of each indoor unit in the air conditioning unit is obtained; the starting number of heating indoor units is determined, and the heating indoor units are indoor units with the heating state being heating; whether the starting number is larger than a defrosting demand threshold value or not is judged; if the starting number is larger than the defrosting demand threshold value, the priority of each heating indoor unit is obtained; determining a target indoor unit in the heating indoor units according to the priority; and the target indoor unit serves as an evaporator for defrosting. By acquiring the heating state of the indoor unit, whether the indoor space corresponding to the indoor unit has the heating requirement or not is determined, then the non-heating indoor unit serves as the evaporator for defrosting, temperature reduction of the indoor space with the heating requirement can be avoided, and comfort of the indoor space with the heating requirement is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air conditioners, and in particular to an air conditioning unit defrosting method and device, an air conditioning unit, and a readable storage medium. BACKGROUND

[0002] When an air conditioning device is in heating operation, the phenomenon of frost formation on the outdoor unit can seriously affect the performance of the air conditioner, so defrosting is required when frost forms. However, in the prior art, the indoor unit is used as an evaporator and the outdoor unit is used as a condenser for defrosting. Therefore, in the defrosting mode, the indoor unit is in a refrigeration state, which causes the indoor temperature to drop and affects the indoor comfort. SUMMARY

[0003] The main purpose of the present application is to provide an air conditioning unit defrosting method, device, air conditioning unit, and readable storage medium, which aims to solve the problem of the defrosting mode affecting indoor comfort in the prior art.

[0004] To achieve the above-mentioned purpose, the present application provides an air conditioning unit defrosting method, which comprises the following steps:

[0005] Triggering a defrosting mode and obtaining the heating state of each indoor unit in the air conditioning unit;

[0006] Determining the number of indoor units that are turned on, wherein the indoor units that are turned on are indoor units that are in a heating state;

[0007] Determining whether the number of indoor units that are turned on is greater than a defrosting requirement threshold;

[0008] If the number of indoor units that are turned on is greater than the defrosting requirement threshold, obtaining the priority of each indoor unit that is in a heating state, wherein the indoor units that are not in a heating state are indoor units that are not in a heating state;

[0009] Determining a target indoor unit from the indoor units that are in a heating state according to the priority;

[0010] Using the target indoor unit as an evaporator for defrosting.

[0011] Optionally, the method comprises the following steps after determining whether the number of indoor units that are turned on is greater than the defrosting requirement threshold:

[0012] If the number of indoor units that are turned on is less than or equal to the defrosting requirement threshold, determining whether the heating state of all indoor units is not in a heating state;

[0013] If the heating state of all indoor units is not in a heating state, determining a defrosting indoor unit from the indoor units;

[0014] Using the defrosting indoor unit as the target indoor unit.

[0015] Optionally, the determining whether the quantity of start-ups is greater than the defrosting requirement threshold comprises:

[0016] If the quantity of start-ups is less than or equal to the defrosting requirement threshold, determining the target indoor unit in the non-heating indoor units, wherein the non-heating indoor unit is an indoor unit in a non-heating state.

[0017] Optionally, the determining the target indoor unit in the heating indoor units according to the priority comprises:

[0018] determining a high-level indoor unit and a low-level indoor unit in the heating indoor units, taking the non-heating indoor unit as the target indoor unit;

[0019] maintaining the high-level indoor unit as a condenser, and determining the target indoor unit in the low-level indoor units.

[0020] Optionally, the maintaining the high-level indoor unit as a condenser, and determining the target indoor unit in the low-level indoor units comprises:

[0021] determining whether the quantity of high-level indoor units is greater than the defrosting requirement threshold;

[0022] If the quantity of high-level indoor units is greater than the defrosting requirement threshold, determining the low-level indoor units as the target indoor units;

[0023] determining a first quantity of target indoor units in the high-level indoor units, wherein the sum of the first quantity and the defrosting requirement threshold is equal to the quantity of high-level indoor units.

[0024] Optionally, the determining a first quantity of target indoor units in the high-level indoor units comprises:

[0025] determining a first quantity of target indoor units in the high-level indoor units in each switching cycle, wherein the high-level indoor units are determined as the target indoor units in different switching cycles in turn;

[0026] the high-level indoor units not determined as the target indoor units are maintained as condensers.

[0027] Optionally, the maintaining the high-level indoor unit as a condenser, and determining the target indoor unit in the low-level indoor units comprises:

[0028] determining whether the quantity of high-level indoor units is greater than the defrosting requirement threshold;

[0029] If the quantity of high-level indoor units is less than or equal to the defrosting requirement threshold, maintaining the high-level indoor units as condensers;

[0030] In each switching cycle, a second number of the target indoor units is determined in the low-level indoor unit, wherein the second number, the number of the non-heating indoor units and the sum of the defrosting demand threshold value are equal to the number of indoor units.

[0031] The low-level indoor unit which is not determined as the target indoor unit is used as a condenser.

[0032] To achieve the above object, the present application further provides an air conditioning unit defrosting device, which comprises a control module, an outdoor unit, a plurality of indoor units and a mode switching module; the indoor units are arranged one by one with the mode switching module; the liquid pipe of the outdoor unit is in communication with the first end of the heat exchanger in each indoor unit respectively; the low-pressure gas pipe and the high-pressure gas pipe of the outdoor unit are in communication with the second end of the heat exchanger in the indoor unit through the mode switching module; the indoor units are connected with the detection end of the control module; the output end of the control module is connected with the control end of the mode switching module; wherein:

[0033] The control module is used for triggering a defrosting mode, acquiring the heating state of each indoor unit in the air conditioning unit; determining the number of indoor units in operation, wherein the indoor unit in operation is the indoor unit in the heating state; judging whether the number of indoor units in operation is greater than a defrosting demand threshold value; if the number of indoor units in operation is greater than the defrosting demand threshold value, acquiring the priority of each indoor unit in operation; determining a target indoor unit in the indoor unit in operation according to the priority; and using the target indoor unit as an evaporator to defrost.

[0034] To achieve the above object, the present application further provides an air conditioning unit, which comprises a memory, a processor and a computer program stored in the memory and executable on the processor; when the computer program is executed by the processor, the steps of the air conditioning unit defrosting method are realized.

[0035] To achieve the above object, the present application further provides a computer readable storage medium, which stores a computer program; when the computer program is executed by a processor, the steps of the air conditioning unit defrosting method are realized.

[0036] The application provides an air conditioning unit defrosting method and device, an air conditioning unit and a readable storage medium. The defrosting mode is triggered, and the number of starting heating indoor units is determined, wherein the heating indoor unit is an indoor unit in a heating state. It is determined whether the number of starting is greater than a defrosting demand threshold. The target indoor unit is determined in the non-heating indoor unit, wherein the non-heating indoor unit is an indoor unit in a non-heating state. If the number of starting is greater than the defrosting demand threshold, the priority of each heating indoor unit is obtained. The target indoor unit is determined in the heating indoor unit according to the priority. The target indoor unit is used as an evaporator for defrosting. The heating state of the indoor unit is obtained, so that it is determined whether the indoor space corresponding to the indoor unit has a heating demand, and then the non-heating indoor unit is used as an evaporator for defrosting, so that the temperature of the indoor space with a heating demand can be prevented from being reduced, and the comfort of the indoor space with a heating demand can be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0037] The drawings incorporated in the specification and constituting a part thereof illustrate embodiments consistent with the present application and together with the specification serve to explain the principles of the application.

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, for those skilled in the field, other drawings can also be obtained without creative labor under the premise of the drawings.

[0039] One or more embodiments are exemplarily illustrated by pictures in the drawings corresponding thereto, and the exemplarily illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified. The drawings do not constitute a proportional limitation.

[0040] Figure 1 The flowchart of the first embodiment of the defrosting method of the air conditioning unit of the present application;

[0041] Figure 2 The indoor unit state diagram of an embodiment of the defrosting method of the air conditioning unit of the present application;

[0042] Figure 3 The indoor unit state diagram of another embodiment of the defrosting method of the air conditioning unit of the present application;

[0043] Figure 4 The indoor unit state diagram of still another embodiment of the defrosting method of the air conditioning unit of the present application;

[0044] Figure 5 The module structure diagram of the defrosting device of the air conditioning unit of the present application;

[0045] Figure 6 Fig. 1 is a schematic diagram of a module structure of an air conditioning unit according to the present application. DETAILED DESCRIPTION

[0046] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work should belong to the scope of protection of the present application.

[0047] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplicity, the elements and settings of particular examples in the following description are shown in great detail. Of course, they are merely examples and are presented to provide an enabling description of the application. Also, the present application can refer to a number of elements by a reference numeral. This numbering can be repeated for the sake of simplicity and clarity. However, this does not mean that the various embodiments and / or settings discussed in relation to the different elements are related to each other in the same way as discussed in relation to the same reference numerals.

[0048] It should be understood that the specific embodiments described herein are meant to explain the present application and are not meant to limit the present application. For better understanding of the present application by those skilled in the art, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work should belong to the scope of protection of the present application.

[0049] The present application provides an air conditioning unit defrosting method, referring to Figure 1 , Figure 1 Fig. 1 is a schematic diagram of a module structure of an air conditioning unit according to the present application.

[0050] In step S10, a defrosting mode is triggered, and the heating state of each indoor unit in the air conditioning unit is acquired.

[0051] The defrosting mode is used to defrost the heat exchanger of the outdoor unit. The triggering mode of the defrosting mode can be set based on actual needs. For example, the defrosting mode can be automatically triggered when it is detected that the heat exchanger of the outdoor unit is frosted. For another example, the defrosting mode can be automatically triggered when it is detected that the heat exchanger of the outdoor unit is frosted to a certain degree. For another example, the defrosting mode can be manually controlled and triggered by a user.

[0052] The air conditioning unit in the embodiment includes multiple indoor units, and different indoor units correspond to different indoor spaces, so that the temperature of different indoor spaces can be controlled through different indoor units.

[0053] The heating state indicates whether the indoor unit is in a heating mode; when the indoor unit is in the heating mode, the heating state is heating, and the heat exchanger of the indoor unit acts as a condenser to heat the corresponding indoor space; when the indoor unit is in a non-heating mode, the indoor unit does not work or the heat exchanger acts as an evaporator, and the heating state is non-heating.

[0054] The heating state of the indoor unit can be obtained based on actual needs, for example, by connecting to the indoor unit and obtaining the state identifier of the indoor unit.

[0055] In step S20, the number of indoor units in the heating state is determined, wherein the indoor unit in the heating state is an indoor unit in the heating state.

[0056] In step S30, it is determined whether the number of indoor units in the heating state is greater than the defrosting threshold.

[0057] In step S40, a target indoor unit is determined among the indoor units in the non-heating state, wherein the indoor unit in the non-heating state is an indoor unit in the non-heating state; if the number of indoor units in the heating state is greater than the defrosting threshold, the priority of each indoor unit in the heating state is obtained.

[0058] In step S50, a target indoor unit is determined among the indoor units in the heating state according to the priority.

[0059] The indoor unit in the non-heating state is an indoor unit in the non-heating state, and the indoor unit in the heating state is an indoor unit in the heating state.

[0060] It can be understood that for the indoor unit in the non-heating state, the indoor space is not heated, so it is considered that the indoor space has no heating demand, at this time, even if the indoor unit in the non-heating state is used for defrosting, the temperature of the indoor space will slightly decrease, which is relatively acceptable; for the indoor unit in the heating state, the indoor space is being heated, so the indoor space has a clear heating demand, at this time, if the indoor unit in the heating state is used for defrosting, the temperature of the indoor space corresponding to the indoor unit in the heating state will decrease, affecting the comfort of the user; therefore, in the embodiment, a target indoor unit is determined among the indoor units in the non-heating state, so that the indoor unit in the heating state is maintained in the heating state, and the indoor space with a heating demand can continue to be heated; and the indoor unit in the non-heating state without a heating demand is used for defrosting.

[0061] In actual application, different indoor spaces have different temperature requirements. For example, the indoor space of a machine room has higher requirements for temperature, and therefore, it is necessary to avoid affecting the indoor temperature as much as possible. Therefore, the priority of the indoor unit corresponding to the indoor space can be set to be higher, and the priority of the indoor space with lower frequency of use can be set to be lower. When determining the target indoor unit, the indoor unit with lower priority is preferentially selected as the target indoor unit, so as to ensure the heating demand of the indoor unit with higher priority.

[0062] In step S60, defrosting is performed on the target indoor unit as an evaporator.

[0063] After the target indoor unit is determined, defrosting can be performed on the target indoor unit. It can be understood that the object of defrosting is the outdoor unit. Therefore, in the defrosting mode, the outdoor unit serves as a condenser, and the corresponding indoor unit, i.e., the target indoor unit, serves as an evaporator to realize defrosting.

[0064] For ease of illustration, the structure of the defrosting device of the air conditioning unit to which the defrosting method of the air conditioning unit of the present application is applied will be described below. The defrosting device of the air conditioning unit comprises a control module, an outdoor unit, a plurality of indoor units, and a mode switching module. The indoor units are one-to-one correspondingly arranged with the mode switching module. The liquid pipe of the outdoor unit is in communication with the first end of the heat exchanger in each indoor unit. The low-pressure gas pipe and the high-pressure gas pipe of the outdoor unit are in communication with the second end of the heat exchanger in the indoor unit through the mode switching module. The indoor units are connected with the detection end of the control module, and the output end of the control module is connected with the control end of the mode switching module.

[0065] Referring to Figure 5 , the outdoor unit comprises a compressor F1, a first four-way valve S1, a second four-way valve S2, an outdoor heat exchanger T1, an electronic expansion valve P1, a gas-liquid separator B1, a low-pressure gas pipe valve G1, a high-pressure gas pipe valve G2, and a liquid pipe valve G3.

[0066] The exhaust port of the compressor F1 is in communication with the first end of the first four-way valve S1 and the first end of the second four-way valve S2. The second end of the first four-way valve S1 is connected with the first end of the outdoor heat exchanger T1. The second end of the outdoor heat exchanger T1 is connected with the liquid pipe valve G3 through the indoor electronic expansion valve K3. The third end of the first four-way valve S1 is connected with the low-pressure gas pipe valve G1, the input end of the gas-liquid separator B1, and the third end of the second four-way valve S2, respectively. The third end of the first four-way valve S1 is also connected with the fourth end of the first four-way valve S1 through a capillary. The second end of the second four-way valve S2 is connected with the third end of the second four-way valve S2 through a capillary. The fourth end of the second four-way valve S2 is connected with the high-pressure gas pipe valve G2. The output end of the gas-liquid separator B1 is connected with the inlet end of the compressor F1.

[0067] The mode switching module 100 comprises a low-pressure electromagnetic valve K1 and a heating electromagnetic valve K2; the second end of the indoor heat exchanger is connected to the low-pressure gas pipe valve G1 through the low-pressure electromagnetic valve K1, and the second end of the indoor heat exchanger is connected to the high-pressure gas pipe valve G2 through the heating electromagnetic valve K2.

[0068] In the defrosting mode, the first end and the second end of the first four-way valve S1 are in communication, and the third end and the fourth end are in communication; the first end and the fourth end of the second four-way valve S2 are in communication, and the second end and the third end are in communication.

[0069] At this time, the refrigerant output by the compressor F1 is divided into two paths, one of which passes through the first four-way valve S1, the outdoor heat exchanger T1, and the electronic expansion valve P1 in sequence to reach the liquid pipe valve G3 and is then output; the other of which passes through the second four-way valve S2 to reach the high-pressure gas pipe valve G2;

[0070] The state of the heat exchanger of the corresponding indoor unit is controlled by controlling the electromagnetic valve in the mode switching module 100;

[0071] When the low-pressure electromagnetic valve K1 of the mode switching module 100 is turned on and the heating electromagnetic valve K2 is turned off; the refrigerant enters the indoor heat exchanger T2 from the liquid pipe and is output to the low-pressure gas pipe through the low-pressure electromagnetic valve K1; at this time, the indoor heat exchanger T2 functions as an evaporator to realize the defrosting mode;

[0072] When the heating electromagnetic valve K2 of the mode switching module 100 is turned on and the low-pressure electromagnetic valve K1 is turned off; the refrigerant enters the indoor heat exchanger T2 from the high-pressure gas pipe through the heating electromagnetic valve K2 and is output to the liquid pipe; at this time, the indoor heat exchanger T2 functions as a condenser to maintain the heating mode.

[0073] The refrigerant in the low-pressure gas pipe passes through the low-pressure gas pipe valve G1 and then passes through the gas-liquid separator B1 to reach the inlet end of the compressor F1 after gas-liquid separation.

[0074] The embodiment determines whether the indoor space corresponding to the indoor unit has a heating demand by acquiring the heating state of the indoor unit, and then defrosts the indoor unit that does not have a heating demand as an evaporator, so that the temperature of the indoor space that has a heating demand is prevented from being reduced, and the comfort of the indoor space that has a heating demand is ensured.

[0075] Further, in the second embodiment of the air conditioning unit defrosting method of the present application based on the first embodiment of the present application, the step S30 further comprises the following steps:

[0076] In step S70, if the number of the started units is less than or equal to the defrosting demand threshold, it is determined whether the heating state of all the indoor units is not heating.

[0077] In step S80, if the heating state of all the indoor units is not heating, a defrosting indoor unit is determined among the indoor units.

[0078] Step S90, taking the defrosting chamber indoor unit as the target indoor unit.

[0079] When the heating state of all indoor units is not heating, it means that all indoor spaces corresponding to the indoor units have no heating demand, and therefore, the defrosting operation will not affect the comfort of the indoor space. In this case, the selection of the indoor unit as an evaporator in the defrosting mode can be based on the general control strategy.

[0080] The defrosting indoor unit is an indoor unit determined as an evaporator in the defrosting mode based on the general control strategy of the air conditioning unit. The general control strategy can be set based on actual needs. For example, a fixed number of indoor units can be set as defrosting indoor units. Alternatively, the operation data of the indoor heat exchangers of all indoor units can be obtained, and the indoor units corresponding to the indoor heat exchangers with the lowest temperature can be set as defrosting indoor units to avoid large temperature difference changes of the indoor heat exchangers when the defrosting mode is executed, which can affect the indoor heat exchangers. Alternatively, the indoor units corresponding to the indoor heat exchangers with smaller operation time can be set as defrosting indoor units. It can be understood that the indoor units with smaller operation time are considered to have less temperature control demand for the indoor space corresponding to the indoor units, and therefore, setting the indoor units with smaller operation time as defrosting indoor units can further avoid affecting the indoor space with temperature control demand.

[0081] After determining the defrosting indoor unit, the defrosting indoor unit is taken as the target indoor unit for defrosting.

[0082] In this embodiment, when all indoor units are not heating, the defrosting indoor unit is directly taken as the target indoor unit based on the general control strategy, so that the subsequent determination process of the target indoor unit is not required, the defrosting mode can be entered quickly, and the defrosting efficiency is improved.

[0083] Step S100, if the number of started indoor units is less than or equal to the defrosting demand threshold, determining the target indoor unit from the indoor units not in heating state, wherein the indoor units not in heating state are indoor units in heating state.

[0084] The number of started indoor units is the number of indoor units in heating state.

[0085] The defrosting demand threshold is the maximum number of indoor units allowed to heat in the defrosting mode; it can be understood that in the defrosting mode, a certain number of indoor units are needed as evaporators to ensure the defrosting effect and defrosting efficiency; therefore, the defrosting demand threshold is set in this embodiment to determine the number of indoor units that can remain for heating, and then determine the number of target indoor units; the defrosting demand threshold can be set based on actual defrosting demand, for example, it can be set as a fixed number, or it can be set as a proportion of the number of indoor units included in the air conditioning unit, such as X%; the specific value can be determined by experiment, for example, the number of indoor units that can meet the defrosting mode as evaporators is determined by experiment, and Y% is obtained by dividing the data by the number of indoor units, and then calculating 1-Y%=X%.

[0086] Referring to Figure 2 When the number of start-ups is less than or equal to the defrosting demand threshold, it means that the number of indoor units that need to maintain the heating mode does not exceed the maximum number of indoor units allowed to heat, so the number of indoor units that do not heat can meet the defrosting demand at this time, and the target indoor units can be directly determined in the indoor units that do not heat. Figure 2 It can be seen that at this time, the indoor units that heat are all connected to the high-pressure gas pipe through K2 to maintain the heating mode, and the indoor units that do not heat are all connected to the low-pressure gas pipe through K1 to defrost.

[0087] When determining the target indoor units in the indoor units that do not heat, the actual needs can be set, for example, the determination method of the general control strategy is referred to, but the determination range of the target indoor units is limited in the indoor units that do not heat.

[0088] If the number of start-ups is equal to the defrosting demand threshold, it means that the number of indoor units that do not heat is just the same as the number of evaporators required for defrosting at this time, so all indoor units that do not heat are target indoor units.

[0089] Further, the step S40 comprises:

[0090] Step S41, if the number of start-ups is greater than the defrosting demand threshold, the indoor units that do not heat are target indoor units, and the senior indoor units and the junior indoor units are determined in the indoor units that heat;

[0091] Step S42, the senior indoor units are kept as condensers, and the target indoor units are determined in the junior indoor units.

[0092] When the number of start-ups is greater than the defrosting demand threshold, it means that the number of indoor units that need to maintain the heating mode has exceeded the maximum number of indoor units allowed to heat; at this time, the number of indoor units that do not heat cannot meet the defrosting demand, and part of the indoor units that heat need to be selected as target indoor units to achieve defrosting.

[0093] It can be understood that, since the indoor space corresponding to the non-heating indoor unit does not have a heating demand, all non-heating indoor units are first taken as the target indoor units.

[0094] In order to meet the heating demand of the indoor space corresponding to the heating indoor unit as much as possible, in the embodiment, the indoor units are set as high-level indoor units and low-level indoor units. The high-level indoor unit is an indoor unit with a higher heating priority, and the low-level indoor unit is an indoor unit with a lower heating priority. In actual application, different indoor spaces have different temperature requirements. For example, the indoor space of a machine room has a higher requirement for temperature, and therefore, it is necessary to avoid affecting the indoor temperature as much as possible. Therefore, the indoor unit corresponding to such an indoor space can be taken as a high-level indoor unit. For an indoor space with a lower frequency of use, the requirement for temperature is lower, and therefore, the indoor unit corresponding to the indoor space can be taken as a target indoor unit. The setting of the high-level indoor unit and the low-level indoor unit can be based on the temperature requirement of the indoor space in actual application.

[0095] Since the high-level indoor unit has a higher temperature demand, in order to ensure the heating of the high-level indoor unit, the high-level indoor unit is kept as a condenser to maintain the heating mode, and a target indoor unit is determined from the low-level indoor units.

[0096] In the embodiment, the high-level indoor unit is kept as a condenser, so that the high-level indoor unit is in the heating mode, thereby ensuring the temperature stability of the indoor space with a higher temperature demand.

[0097] Further, the step S42 comprises the steps of:

[0098] In step S421, it is determined whether the number of the high-level indoor units is greater than the defrosting demand threshold.

[0099] In step S422, if the number of the high-level indoor units is greater than the defrosting demand threshold, the low-level indoor units are all determined as the target indoor units.

[0100] In step S423, a first number of target indoor units are determined from the high-level indoor units, wherein the sum of the first number and the defrosting demand threshold is equal to the number of the high-level indoor units.

[0101] Referring to Figure 3 When the number of the high-level indoor units is greater than the defrosting demand threshold, it indicates that the number of the high-level indoor units that need to maintain the heating mode has exceeded the maximum number allowed for heating. At this time, the sum of the number of the non-heating indoor units and the number of the low-level indoor units cannot meet the defrosting demand, and it is necessary to select some indoor units from the high-level indoor units as target indoor units to realize defrosting. Figure 3It can be seen that at this time, part of the high-grade indoor units are in communication with the high-pressure gas pipe through K2 to maintain the heating mode, and the other part of the high-grade indoor units and all the non-heating indoor units are in communication with the low-pressure gas pipe through K1 to defrost.

[0102] Since the priority of the low-grade indoor units is relatively low compared with the high-grade indoor units, at this time, all the low-grade indoor units and the non-heating indoor units are taken as the target indoor units.

[0103] At the same time, part of the high-grade indoor units are also determined as the target indoor units; it can be understood that the current still allows the defrosting demand threshold number of indoor units to maintain the heating mode, so only the indoor units exceeding the defrosting demand threshold are taken as the target indoor units; therefore, in this embodiment, the first number of high-grade indoor units are taken as the target indoor units; and the sum of the first number and the defrosting demand threshold is equal to the number of high-grade indoor units; the number of high-grade indoor units-the first number = the defrosting demand threshold; therefore, after the first number of high-grade indoor units are taken as the target indoor units, the defrosting demand can be met, and the remaining high-grade indoor units can still maintain the heating mode.

[0104] In this embodiment, by taking all the low-grade indoor units as the target indoor units and selecting part of the high-grade indoor units as the target indoor units, the heating mode of part of the high-grade indoor units can still be guaranteed.

[0105] Further, the step S423 comprises the steps of:

[0106] In each switching period, a first number of the target indoor units are determined from the high-grade indoor units, wherein the high-grade indoor units are determined as the target indoor units in turn in different switching periods;

[0107] The high-grade indoor units which are not determined as the target indoor units are taken as the condenser.

[0108] The switching period indicates the period of switching of the target indoor units; the indoor units contained in the target indoor units are fixed in one switching period; the specific length of the switching period can be set based on actual needs, such as 20 minutes.

[0109] It can be understood that since the high-grade indoor units all have high-priority temperature requirements, if several indoor units are fixedly determined as the target indoor units from the high-grade indoor units, the temperature of the indoor space corresponding to the high-grade indoor units determined as the target indoor units will still be greatly affected; therefore, in order to avoid as much as possible the great influence on the temperature of the indoor space corresponding to the high-grade indoor units, in this embodiment, the high-grade indoor units are taken as the target indoor units in turn, so that each high-grade indoor unit can share the temperature reduction caused by defrosting, avoid the temperature of the individual high-grade indoor unit being too low, and maintain the overall temperature of the high-grade indoor units stable.

[0110] It can be understood that when the advanced indoor units are switched in different switching periods, selection needs to be performed in sequence so that all the advanced indoor units are sequentially taken as target indoor units, and are also sequentially kept in the heating mode to ensure temperature balance; for example, the advanced indoor units include a first advanced indoor unit, a second advanced indoor unit, a third advanced indoor unit, a fourth advanced indoor unit, a fifth advanced indoor unit, and a sixth advanced indoor unit, two advanced indoor units need to be selected as target indoor units in each switching period, the first advanced indoor unit and the second advanced indoor unit are selected as target indoor units in a first switching period, the third advanced indoor unit and the fourth advanced indoor unit are selected as target indoor units in a second switching period, the fifth advanced indoor unit and the sixth advanced indoor unit are selected as target indoor units in a third switching period, and the first advanced indoor unit and the second advanced indoor unit are selected as target indoor units in a fourth switching period, and the like.

[0111] Further, the step S42 includes the steps of:

[0112] determining whether the number of the advanced indoor units is greater than the defrosting demand threshold value;

[0113] In step S424, if the number of the advanced indoor units is less than or equal to the defrosting demand threshold value, the advanced indoor units are kept as condensers.

[0114] In step S425, a second number of target indoor units are determined from the low-level indoor units in each switching period, where the second number, the number of the non-heating indoor units, and the defrosting demand threshold value are equal to the number of indoor units.

[0115] In step S426, the low-level indoor units that are not determined as the target indoor units are taken as condensers.

[0116] Referring to Figure 4 If the number of the advanced indoor units is less than or equal to the defrosting demand threshold value, as long as a certain number of indoor units are selected from the low-level indoor units as target indoor units. Therefore, in this embodiment, the second number of low-level indoor units are taken as target indoor units; and the second number, the number of the non-heating indoor units, and the defrosting demand threshold value are equal to the number of indoor units; that is, the number of indoor units - the number of non-heating indoor units - the second number = the defrosting demand threshold value; therefore, after the second number of low-level indoor units are taken as target indoor units, the defrosting demand can be met, and the remaining low-level indoor units can still maintain the heating mode. Figure 4 It can be understood that at this time, all the advanced indoor units and part of the low-level indoor units are in communication with the high-pressure gas pipe through K2 and maintain the heating mode, and the other part of the low-level indoor units and all the non-heating indoor units are in communication with the low-pressure gas pipe through K1 and perform defrosting.

[0117] It can be understood that, since the low-level indoor unit has a heating demand, if several indoor units are fixedly determined as target indoor units from the low-level indoor unit, the temperature of the indoor space corresponding to the low-level indoor unit determined as the target indoor unit will still be greatly affected; therefore, in order to avoid as much as possible the great influence on the temperature of the indoor space corresponding to the low-level indoor unit, the low-level indoor unit is taken as the target indoor unit in turn in the embodiment, so that each low-level indoor unit can share the temperature reduction caused by defrosting, avoid that the temperature of the individual low-level indoor unit is too low, and maintain the overall temperature stability of the low-level indoor unit.

[0118] It can be understood that, when the low-level indoor unit is switched in different switching periods, selection needs to be performed in sequence, so that all the low-level indoor units are taken as target indoor units in sequence, and the heating mode is also maintained in sequence to ensure temperature balance; for example, the low-level indoor units include a first low-level indoor unit, a second low-level indoor unit, a third low-level indoor unit, a fourth low-level indoor unit, a fifth low-level indoor unit, and a sixth low-level indoor unit, two low-level indoor units need to be selected as target indoor units in each switching period, the first low-level indoor unit and the second low-level indoor unit are selected as target indoor units in the first switching period, the third low-level indoor unit and the fourth low-level indoor unit are selected as target indoor units in the second switching period, the fifth low-level indoor unit and the sixth low-level indoor unit are selected as target indoor units in the third switching period, and the first low-level indoor unit and the second low-level indoor unit are selected as target indoor units in the fourth switching period, and so on.

[0119] It should be noted that, for the foregoing method embodiments, in order to simply describe, they are all expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the action sequence described, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification all belong to preferred embodiments, and the actions and modules involved are not necessarily essential to the present application.

[0120] From the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be realized by means of software and a necessary general hardware platform, and of course, it can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as a ROM / RAM, a magnetic disk, or an optical disk) and includes a plurality of instructions for causing a terminal device (which can be a mobile phone, a computer, a server, or a network device) to execute the method described in each embodiment of the present application.

[0121] The application also provides an air conditioning unit defrosting device for implementing the air conditioning unit defrosting method, which comprises a control module, an outdoor unit, a plurality of indoor units and a mode switching module; the indoor units are arranged in one-to-one correspondence with the mode switching module, the liquid pipe of the outdoor unit is in communication with the first end of the heat exchanger in each indoor unit, the low-pressure gas pipe and the high-pressure gas pipe of the outdoor unit are in communication with the second end of the heat exchanger in the indoor unit through the mode switching module; the indoor units are connected with the detection end of the control module, and the output end of the control module is connected with the control end of the mode switching module; wherein:

[0122] The control module is used for triggering a defrosting mode, acquiring the heating state of each indoor unit in the air conditioning unit, determining the number of indoor units that are started, wherein the indoor units that are started are indoor units in the heating state, judging whether the number of indoor units that are started is greater than a defrosting demand threshold, acquiring the priority of each indoor unit that is heated if the number of indoor units that are started is greater than the defrosting demand threshold, determining the target indoor unit in the indoor units that are heated according to the priority, and defrosting the target indoor unit as an evaporator.

[0123] The air conditioning unit defrosting device can determine whether the indoor space corresponding to the indoor unit has a heating demand by acquiring the heating state of the indoor unit, and defrost the indoor unit that is not heated as an evaporator, thereby avoiding the temperature reduction of the indoor space that has a heating demand and ensuring the comfort of the indoor space that has a heating demand.

[0124] Further, the judgment of whether the number of indoor units that are started is greater than the defrosting demand threshold comprises:

[0125] If the number of indoor units that are started is less than or equal to the defrosting demand threshold, it is judged whether the heating state of all indoor units is not heated.

[0126] If the heating state of all indoor units is not heated, a defrosting indoor unit is determined in the indoor units.

[0127] The defrosting indoor unit is taken as the target indoor unit.

[0128] Further, the judgment of whether the number of indoor units that are started is greater than the defrosting demand threshold comprises:

[0129] If the number of indoor units that are started is less than or equal to the defrosting demand threshold, the target indoor unit is determined in the indoor units that are not heated, wherein the indoor units that are not heated are indoor units in the heating state.

[0130] Further, the determination of the target indoor unit in the indoor units that are heated according to the priority comprises:

[0131] determining a high-level indoor unit and a low-level indoor unit in the heating indoor unit;

[0132] maintaining the high-level indoor unit as a condenser and determining the target indoor unit in the low-level indoor unit.

[0133] Further, the maintaining the high-level indoor unit as a condenser and determining the target indoor unit in the low-level indoor unit comprises:

[0134] judging whether the number of the high-level indoor units is greater than the defrosting demand threshold value;

[0135] if the number of the high-level indoor units is greater than the defrosting demand threshold value, determining all the low-level indoor units as the target indoor units;

[0136] determining a first number of the target indoor units in the high-level indoor units, wherein the sum of the first number and the defrosting demand threshold value is equal to the number of the high-level indoor units.

[0137] Further, the determining a first number of the target indoor units in the high-level indoor units comprises:

[0138] in each switching cycle, determining a first number of the target indoor units in the high-level indoor units, wherein the high-level indoor units are determined as the target indoor units in turn in different switching cycles;

[0139] the high-level indoor units not determined as the target indoor units serve as condensers.

[0140] Further, the maintaining the high-level indoor unit as a condenser and determining the target indoor unit in the low-level indoor unit comprises:

[0141] judging whether the number of the high-level indoor units is greater than the defrosting demand threshold value;

[0142] if the number of the high-level indoor units is less than or equal to the defrosting demand threshold value, maintaining the high-level indoor units as condensers;

[0143] in each switching cycle, determining a second number of the target indoor units in the low-level indoor units, wherein the sum of the second number, the number of the non-heating indoor units and the defrosting demand threshold value is equal to the number of indoor units;

[0144] the low-level indoor units not determined as the target indoor units serve as condensers.

[0145] Reference Figure 6The air conditioning unit can include a communication module 10, a memory 20, a processor 30 and the like in hardware structure. In the air conditioning unit, the processor 30 is connected with the memory 20 and the communication module 10 respectively, the memory 20 stores a computer program, the computer program is executed by the processor 30, and the computer program realizes the steps of the above method embodiment when executed.

[0146] The communication module 10 can be connected with external communication equipment through a network. The communication module 10 can receive a request sent by the external communication equipment, and can also send a request, an instruction and information to the external communication equipment. The external communication equipment can be other air conditioning units, servers or Internet of Things equipment such as televisions and the like.

[0147] The memory 20 can be used to store software programs and various data. The memory 20 can mainly include a program storage area and a data storage area. The program storage area can store an operating system, at least one application program required by a function (such as triggering a defrosting mode, obtaining a heating state of each indoor unit in the air conditioning unit) and the like. The data storage area can include a database, and the data storage area can store data or information created according to the use of the system and the like. In addition, the memory 20 can include a high-speed random access memory, and can also include a non-volatile memory such as at least one magnetic disk storage device, a flash memory device or other volatile solid-state memory device.

[0148] The processor 30 is the control center of the air conditioning unit, connects each part of the air conditioning unit through various interfaces and lines, executes the software programs and / or modules stored in the memory 20 and calls the data stored in the memory 20, executes various functions of the air conditioning unit and processes data, so as to monitor the air conditioning unit as a whole. The processor 30 can include one or more processing units. Optionally, the processor 30 can integrate an application processor and a modem processor. The application processor mainly processes an operating system, a user interface and an application program and the like, and the modem processor mainly processes wireless communication. It can be understood that the above-mentioned modem processor can also not be integrated into the processor 30.

[0149] Although Figure 6 Although not shown, the above-mentioned air conditioning unit can also include a circuit control module for connecting with a power supply to ensure the normal work of other components. Those skilled in the art can understand that Figure 6 The structure of the air conditioning unit shown in the above-mentioned embodiment does not constitute a limitation on the air conditioning unit, and can include more or fewer components than shown in the figure, or combine certain components, or different component arrangements.

[0150] The application further provides a computer readable storage medium having a computer program stored thereon. The computer readable storage medium can beFigure 6 The memory 20 in the air conditioning unit can also be at least one of a ROM (Read-Only Memory), a RAM (Random Access Memory), a magnetic disc, and an optical disc. The computer readable storage medium includes a plurality of instructions for causing a terminal device (which can be a television, a car, a mobile phone, a computer, a server, a terminal, or a network device) having a processor to execute the method described in the various embodiments of the present application.

[0151] In the present application, the terms "first", "second", "third", "fourth", "fifth" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0152] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present application and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0153] Although the embodiments of the present application have been shown and described above, the scope of protection of the present application is not limited thereto. It can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. Those skilled in the art can make changes, modifications and replacements to the above embodiments within the scope of the present application, and these changes, modifications and replacements should be covered within the scope of protection of the present application. Therefore, the scope of protection of the present application should be subject to the scope of protection of the claims.

Claims

1. An air conditioning unit defrosting method, characterized by, The air conditioning unit defrosting method comprises: triggering a defrosting mode, obtaining the heating state of each indoor unit in the air conditioning unit; determining the number of indoor units that are turned on, wherein the indoor units that are turned on are indoor units in a heating state; determining whether the number of indoor units that are turned on is greater than a defrosting demand threshold value; if the number of indoor units that are turned on is greater than the defrosting demand threshold value, obtaining the priority of each indoor unit that is turned on; determining a target indoor unit from the indoor units that are turned on according to the priority; defrosting the target indoor unit as an evaporator.

2. The air conditioning unit defrosting method of claim 1, wherein, The method further comprises: if the number of indoor units that are turned on is less than or equal to the defrosting demand threshold value, determining whether the heating state of all indoor units is not heating; if the heating state of all indoor units is not heating, determining a defrosting indoor unit from the indoor units; defrosting the defrosting indoor unit as the target indoor unit.

3. The air conditioning unit defrosting method of claim 1 wherein, The method further comprises: if the number of indoor units that are turned on is less than or equal to the defrosting demand threshold value, determining the target indoor unit from indoor units that are not heating, wherein the indoor units that are not heating are indoor units in a non-heating state.

4. The air conditioning unit defrosting method of claim 1 wherein, The method further comprises: determining indoor units that are not heating as target indoor units, and determining high-level indoor units and low-level indoor units from the indoor units that are turned on; maintaining the high-level indoor units as condensers, and determining the target indoor unit from the low-level indoor units.

5. The air conditioning unit defrosting method of claim 4 wherein, The method further comprises: determining whether the number of high-level indoor units is greater than the defrosting demand threshold value; if the number of high-level indoor units is greater than the defrosting demand threshold value, determining the low-level indoor units as the target indoor units; determining a first number of target indoor units from the high-level indoor units, wherein the sum of the first number and the defrosting demand threshold value is equal to the number of high-level indoor units.

6. The air conditioning unit defrosting method of claim 5 wherein, The method further comprises: determining a first number of target indoor units from the high-level indoor units in each switching cycle, wherein the high-level indoor units are determined as the target indoor units in different switching cycles in turn; maintaining the high-level indoor units that are not determined as the target indoor units as condensers.

7. The air conditioning unit defrosting method of claim 4 wherein, The method further comprises: determining whether the number of high-level indoor units is greater than the defrosting demand threshold value; if the number of high-level indoor units is less than or equal to the defrosting demand threshold value, maintaining the high-level indoor units as condensers; determining a second number of target indoor units from the low-level indoor units in each switching cycle, wherein the sum of the second number, the number of indoor units that are not heating, and the defrosting demand threshold value is equal to the number of indoor units; maintaining the low-level indoor units that are not determined as the target indoor units as condensers.

8. An air conditioning unit defrosting apparatus characterized by, The air conditioning unit defrosting device comprises a control module, an outdoor unit, a plurality of indoor units and a mode switching module; the indoor units and the mode switching module are one-to-one corresponding, the liquid pipe of the outdoor unit is in communication with the first end of the heat exchanger in each indoor unit, the low-pressure gas pipe and the high-pressure gas pipe of the outdoor unit are in communication with the second end of the heat exchanger in the indoor unit through the mode switching module; the indoor units are connected with the detection end of the control module, the output end of the control module is connected with the control end of the mode switching module; wherein: The control module is used for triggering a defrosting mode, acquiring the heating state of each indoor unit in the air conditioning unit, determining the number of indoor units that are turned on, wherein the indoor units that are turned on are indoor units in the heating state; determining whether the number of indoor units that are turned on is greater than a defrosting demand threshold; if the number of indoor units that are turned on is greater than the defrosting demand threshold, acquiring the priority of each indoor unit that is turned on; determining a target indoor unit in the indoor units that are turned on according to the priority; and taking the target indoor unit as an evaporator to defrost.

9. An air conditioning unit characterized by, The air conditioning unit comprises a memory, a processor and a computer program stored on the memory and executable on the processor, and the computer program is executed by the processor to implement the steps of the air conditioning unit defrosting method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program is executed by the processor to implement the steps of the air conditioning unit defrosting method according to any one of claims 1 to 7.

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