Heat recovery air conditioner control method and system, medium, electronic equipment and air conditioner

Abstract

The invention relates to the technical field of air conditioners, particularly provides a heat recovery air conditioner control method and system, a medium, electronic equipment and an air conditioner, and aims to solve the problem that a heat recovery air conditioner cannot ensure continuous heating of an indoor unit or heating of a main body when an outdoor unit is defrosted. In order to achieve the purpose, the heat recovery air conditioner control method comprises the steps that in response to a defrosting instruction, based on control over the states of three four-way valves, an outdoor unit is switched to a first defrosting mode or a second defrosting mode from a heating mode or a main body heating mode; if the first defrosting mode is started, the first outdoor unit heat exchanger conducts defrosting, and the indoor unit conducts continuous heating or the main body conducts heating; and if the second defrosting mode is started, the second outdoor unit heat exchanger conducts defrosting, and the indoor unit conducts continuous heating or the main body conducts heating. The effect that the indoor unit continuously heats or the main body heats while the outdoor unit defrosts is achieved, and the indoor temperature experience is optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and specifically provides a heat recovery air conditioner control method, system, medium, electronic equipment and air conditioner. Background Art

[0002] When the outdoor environment is cold and the air conditioner is used for indoor heating, it is easy for frost to form on the outdoor unit heat exchanger, which will increase energy consumption, reduce heating efficiency, and even make the air conditioner unable to work normally.

[0003] When there is a lot of frost on the outdoor unit of an existing air conditioner, the indoor unit is often switched to cooling mode, so that the outdoor unit acts as a condenser, thereby raising its temperature to achieve the purpose of defrosting; at the same time, the indoor unit fan and the indoor unit air outlet are turned off to prevent cold air from entering the room.

[0004] However, the defrosting process in the prior art usually lasts about 10 minutes, during which the indoor unit cannot heat or blow hot air, which still affects the indoor temperature perception; and when the temperature of the outdoor unit is lower, defrosting is required more frequently, and the indoor heating is frequently shut down, resulting in a very poor user experience.

[0005] Especially for heat recovery air conditioners with complex refrigerant pathways, since some indoor units may be heating and some may be cooling, it is even more difficult to complete the defrosting of the outdoor unit while ensuring that the indoor unit maintains the original air outlet mode.

[0006] Accordingly, the art requires a new heat recovery air conditioner control solution to solve the above problems. Summary of the invention

[0007] In order to overcome the above-mentioned defects, the present invention is proposed to provide a heat recovery air conditioner control method, system, medium, electronic equipment and air conditioner to solve or at least partially solve the technical problem that the heat recovery air conditioner cannot ensure continuous heating of the indoor unit or main body heating when the outdoor unit is defrosted.

[0008] In a first aspect, the present invention provides a control method for a heat recovery air conditioner, wherein the heat recovery air conditioner comprises an outdoor unit and a plurality of indoor units, wherein the outdoor unit comprises a first outdoor unit heat exchanger, a second outdoor unit heat exchanger and a compressor, wherein each of the indoor units comprises at least one indoor unit heat exchanger, wherein the indoor unit heat exchanger is connected to a liquid pipe, a low-pressure gas pipe and a high-pressure gas pipe respectively; wherein the heat recovery air conditioner is provided with at least three four-way valves, wherein the first four-way valve selectively connects the first outdoor unit heat exchanger to the low-pressure gas pipe, or the compressor to the first outdoor unit heat exchanger; the second four-way valve selectively connects the second outdoor unit heat exchanger to the low-pressure gas pipe, or the compressor to the second outdoor unit heat exchanger; and the third four-way valve selectively controls the connection between the compressor and the high-pressure gas pipe; the method comprises:

[0009] In response to a defrost command, the outdoor unit switches from a heating mode or a main heating mode to a first defrost mode or a second defrost mode based on control of the states of the three four-way valves;

[0010] If the first defrost mode is turned on, the first outdoor unit heat exchanger is defrosted, and the indoor unit continues to heat or mainly heats; if the second defrost mode is turned on, the second outdoor unit heat exchanger is defrosted, and the indoor unit continues to heat or mainly heats.

[0011] In a technical solution of the above-mentioned heat recovery air conditioner control method, the first four-way valve forms a refrigerant passage between the first outdoor unit heat exchanger and the low-pressure gas pipe when it is powered on, and forms a refrigerant passage between the compressor and the first outdoor unit heat exchanger when it is powered off; the second four-way valve forms a refrigerant passage between the second outdoor unit heat exchanger and the low-pressure gas pipe when it is powered on, and forms a refrigerant passage between the compressor and the second outdoor unit heat exchanger when it is powered off; the third four-way valve forms a refrigerant passage between the compressor and the high-pressure gas pipe when it is powered on, and does not form a refrigerant passage between the compressor and the high-pressure gas pipe when it is powered off; the method comprises:

[0012] When the first defrost mode is turned on, the first four-way valve is powered off, the second four-way valve is powered on, and the third four-way valve is powered on;

[0013] When the second defrost mode is turned on, the first four-way valve is powered on, the second four-way valve is powered off, and the third four-way valve is powered on.

[0014] In a technical solution of the above heat recovery air conditioner control method, the outdoor unit is switched from the heating mode or the main heating mode to the first defrost mode or the second defrost mode, and the method further includes:

[0015] When the outdoor unit is in a heating mode or a main heating mode, the first four-way valve is controlled to be powered on, the second four-way valve is controlled to be powered on, and the third four-way valve is controlled to be powered on.

[0016] In a technical solution of the above heat recovery air conditioner control method, a liquid shutoff valve corresponding to each indoor unit is provided on the liquid pipe, and the method further includes:

[0017] In response to detecting a refrigerant leakage, the liquid shutoff valve is closed to cut off a refrigerant passage between the liquid pipe and the corresponding indoor unit.

[0018] In a technical solution of the above heat recovery air conditioner control method, the outdoor unit is further provided with a first defrost sensor and a second defrost sensor, which are respectively used to collect temperature values ​​of the first outdoor unit heat exchanger and the second outdoor unit heat exchanger; the method further includes:

[0019] Based on the temperature value data collected by the first defrost sensor and the second defrost sensor, determining whether the first outdoor unit heat exchanger and the second outdoor unit heat exchanger have reached a preset defrost temperature value;

[0020] If the first defrost sensor reaches the defrost temperature value first, the first defrost mode is turned on;

[0021] If the second defrost sensor reaches the defrost temperature value first, the second defrost mode is turned on.

[0022] In a technical solution of the above heat recovery air conditioner control method, after the outdoor unit is switched from the heating mode or the main heating mode to the first defrost mode or the second defrost mode, the method further includes:

[0023] After the first defrost mode or the second defrost mode is completed, determining whether to continue defrosting;

[0024] If yes, re-acquire the temperature value data collected by the first defrost sensor and the second defrost sensor, and return to the step of "determining whether the first outdoor unit heat exchanger and the second outdoor unit heat exchanger have reached the preset defrost temperature value based on the temperature value data collected by the first defrost sensor and the second defrost sensor";

[0025] If not, the defrosting is finished and the outdoor unit returns to the heating mode or the main heating mode.

[0026] In a second aspect, the present invention provides a heat recovery air conditioner control system, the heat recovery air conditioner comprises an outdoor unit and a plurality of indoor units, the outdoor unit comprises a first outdoor unit heat exchanger, a second outdoor unit heat exchanger and a compressor, each of the indoor units comprises at least one indoor unit heat exchanger, the indoor unit heat exchanger is connected to a liquid pipe, a low-pressure gas pipe and a high-pressure gas pipe respectively; the heat recovery air conditioner is provided with at least three four-way valves, wherein the first four-way valve selectively connects the first outdoor unit heat exchanger to the low-pressure gas pipe, or the compressor to the first outdoor unit heat exchanger; the second four-way valve selectively connects the second outdoor unit heat exchanger to the low-pressure gas pipe, or the compressor to the second outdoor unit heat exchanger; the third four-way valve selectively controls the connection between the compressor and the high-pressure gas pipe; the system comprises:

[0027] An instruction acquisition module is used to acquire a defrost instruction for the outdoor unit to switch from a heating mode or a main heating mode to a first defrost mode or a second defrost mode;

[0028] The defrost control module controls the first outdoor unit heat exchanger to defrost if the first defrost mode is turned on, and the indoor unit continues to heat or the main unit heats; if the second defrost mode is turned on, the second outdoor unit heat exchanger is controlled to defrost, and the indoor unit continues to heat or the main unit heats.

[0029] In a third aspect, a computer-readable storage medium is provided, in which a plurality of program codes are stored, wherein the program codes are suitable for being loaded and run by a processor to execute the heat recovery air conditioner control method described in any one of the technical solutions of the above-mentioned heat recovery air conditioner control method.

[0030] In a fourth aspect, an electronic device is provided, which includes a processor and a memory, wherein the memory is suitable for storing multiple program codes, and the program codes are suitable for being loaded and run by the processor to execute the heat recovery air conditioner control method described in any one of the technical solutions of the above-mentioned heat recovery air conditioner control method.

[0031] In a fifth aspect, a heat recovery air conditioner is provided, comprising a heat recovery air conditioner body and the above-mentioned heat recovery air conditioner control system and / or the above-mentioned electronic device.

[0032] The above one or more technical solutions of the present invention have at least one or more of the following Beneficial effects:

[0033] In the technical solution for implementing the present invention, based on the control of the states of the three four-way valves, the outdoor unit switches from the heating mode or the main heating mode to the first defrost mode or the second defrost mode, so that the indoor unit continues to heat or the main heating mode while the outdoor unit is defrosting, thereby optimizing the indoor temperature experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In addition, similar numbers in the figures are used to represent similar components, among which:

[0035] Figure 1 is a schematic structural diagram of a heat recovery air conditioner according to an embodiment of the present invention;

[0036] Figure 2 is a flow chart of the main steps of a heat recovery air conditioner control method according to an embodiment of the present invention;

[0037] Figure 3 is a detailed flow chart of the steps of a heat recovery air conditioner control method according to an embodiment of the present invention;

[0038] Figure 4 is a main structural block diagram of a heat recovery air conditioner control system according to an embodiment of the present invention;

[0039] Figure 5 It is a main structural block diagram of an electronic device for executing the heat recovery air conditioner control method of the present invention.

[0041] Reference numerals list :

[0042] 1a: first valve box; 2a: second valve box; 3a: third valve box;

[0043] 1b: first indoor unit; 2b: second indoor unit; 3b: third indoor unit;

[0044] 1c: electronic expansion valve of the first indoor unit; 2c: electronic expansion valve of the second indoor unit; 3c: electronic expansion valve of the third indoor unit;

[0045] 1d: first indoor unit heat exchanger; 2d: second indoor unit heat exchanger; 3d: third indoor unit heat exchanger;

[0046] 1e: first liquid shut-off valve; 2e: second liquid shut-off valve; 3e: third liquid shut-off valve;

[0047] 1f: first low-pressure air pipe valve; 2f: second low-pressure air pipe valve; 3f: third low-pressure air pipe valve;

[0048] 1g: first high-pressure air pipe valve; 2g: second high-pressure air pipe valve; 3g: third high-low pressure air pipe valve;

[0049] 4: compressor; 5: oil separator; 6: gas-liquid separator;

[0050] 7: first outdoor unit heat exchanger; 7a: first four-way valve; 7b: first defrost sensor; 7c: first outdoor unit electronic expansion valve;

[0051] 8: second outdoor unit heat exchanger; 8a: second four-way valve; 8b: second defrost sensor; 8c: second outdoor unit electronic expansion valve;

[0052] 9: External fan;

[0053] 10: The third four-way valve;

[0054] 11: Liquid stop valve; 11a: Liquid pipe;

[0055] 12: Low-pressure gas pipe stop valve; 12a: Low-pressure gas pipe;

[0056] 13: High-pressure gas pipe stop valve; 13a: High-pressure gas pipe;

[0057] 14: Outdoor unit;

[0058] 41: instruction acquisition module; 42: defrost control module;

[0059] 500: electronic device; 501: processor; 502: memory; 503: program code. DETAILED DESCRIPTION

[0060] Some embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0061] In the description of the present invention, "module" and "processor" may include hardware, software or a combination of the two. A module may include hardware circuits, various suitable sensors, communication ports, and memories, and may also include software parts, such as program codes, or a combination of software and hardware. The processor may be a central processing unit, a microprocessor, an image processor, a digital signal processor, or any other suitable processor. The processor has data and / or signal processing functions. The processor may be implemented in software, hardware, or a combination of the two. Non-temporary computer-readable storage media include any suitable medium that can store program codes, such as a magnetic disk, a hard disk, an optical disk, a flash memory, a read-only memory, a random access memory, and the like. The term "A and / or B" means all possible combinations of A and B, such as only A, only B, or A and B. The term "at least one A or B" or "at least one of A and B" has a similar meaning to "A and / or B", and may include only A, only B, or A and B. The singular terms "one" and "the" may also include plural forms.

[0062] For heat recovery air conditioners, in order to cope with different temperature control requirements and meet the simultaneous heating and cooling requirements of different indoor units, the outdoor unit can at least operate in heating mode, main heating mode, cooling mode, and main cooling mode. For a multi-split air conditioner with one outdoor unit and multiple indoor units, when the outdoor unit operates in heating mode, the indoor unit heats; when the outdoor unit operates in main heating mode, most of the indoor units heat, that is, main heating; when the outdoor unit operates in cooling mode, all indoor units cool; when the outdoor unit operates in main cooling mode, most of the indoor units cool, that is, main cooling.

[0063] In order to ensure that the indoor unit of the heat recovery air conditioner is continuously heated or the main body is heated when the outdoor unit of the heat recovery air conditioner is defrosted, the present invention provides a heat recovery air conditioner control method.

[0064] The heat recovery air conditioner control method of the present invention is applied to the heat recovery air conditioner, please refer to Figure 1 , Figure 1 Schematic diagram of the structure of a heat recovery air conditioner according to an embodiment of the present invention.

[0065] like Figure 1As shown, the heat recovery air conditioner includes an outdoor unit 14 and multiple indoor units 1b, 2b, 3b, the outdoor unit 14 includes a first outdoor unit heat exchanger 7, a second outdoor unit heat exchanger 8 and a compressor 4, each of the indoor units includes at least one indoor unit heat exchanger 1d, 2d, 3d, and the indoor unit heat exchanger is respectively connected to the liquid pipe 11a, the low-pressure gas pipe 12a and the high-pressure gas pipe 13a; the heat recovery air conditioner is provided with at least three four-way valves 7a, 8a, 10, wherein the first four-way valve 7a selectively connects the first outdoor unit heat exchanger 7 and the low-pressure gas pipe 12a, or the compressor 4 and the first outdoor unit heat exchanger 7; the second four-way valve 8a selectively connects the second outdoor unit heat exchanger 8 and the low-pressure gas pipe 12a, or the compressor 4 and the second outdoor unit heat exchanger 8; the third four-way valve 10 selectively controls the connection between the compressor 4 and the high-pressure gas pipe 13a.

[0066] For example, in the outdoor unit 14, the first outdoor heat exchanger 7 and the second outdoor heat exchanger 8 may be divided up and down as shown in the figure, or may be divided left and right, or in other division forms.

[0067] In one embodiment, the first four-way valve 7a, the second four-way valve 8a and the third four-way valve 10 are all provided with capillaries, and no passage can be formed between the two interfaces connected by the capillaries, so that the first four-way valve 7a, the second four-way valve 8a and the third four-way valve 10 satisfy the above connection relationship. In other embodiments of the present invention, other methods can also be used to obtain four-way valves that satisfy the above connection relationship.

[0068] See attached Figure 2 , Figure 2 FIG. 1 is a flow chart showing the main steps of a heat recovery air conditioner control method according to an embodiment of the present invention. Figure 2 As shown, the heat recovery air conditioner control method in the embodiment of the present invention mainly includes the following steps S21-S22.

[0069] Step S21 , in response to a defrost instruction, based on the control of the states of the three four-way valves, the outdoor unit switches from the heating mode or the main heating mode to the first defrost mode or the second defrost mode.

[0070] In one embodiment, the outdoor unit switches from a heating mode or a main heating mode to a first defrost mode or a second defrost mode, and the method further includes: when the outdoor unit 14 is in a heating mode or a main heating mode, controlling the first four-way valve 7a to be powered on (ON), the second four-way valve 8a to be powered on (ON), and the third four-way valve 10 to be powered on (ON).

[0071] In this embodiment, when the outdoor unit 14 operates in the heating mode, the first indoor unit 1b, the second indoor unit 2b, and the third indoor unit 3b are all heated; when the outdoor unit 14 operates in the main heating mode, most of the indoor units are heated. For example, see Figure 1 , where the first indoor unit 1b and the second indoor unit 2b are heating, and the third indoor unit 3b is cooling, which is the main heating mode.

[0072] In other embodiments of the present invention, the number of indoor units is not limited to three, and the configuration of the main heating is not limited to the above examples. Those skilled in the art can make settings according to actual needs.

[0073] The first defrost mode is an operation mode in which the first outdoor heat exchanger 7 is defrosted, and the second defrost mode is an operation mode in which the second outdoor heat exchanger 8 is defrosted.

[0074] Step S22, if the first defrost mode is turned on, the first outdoor unit heat exchanger is defrosted, and the indoor unit continues to heat or mainly heats; if the second defrost mode is turned on, the second outdoor unit heat exchanger is defrosted, and the indoor unit continues to heat or mainly heats.

[0075] In one embodiment, the first four-way valve 7a forms a refrigerant passage between the first outdoor unit heat exchanger 7 and the low-pressure air pipe 12a when it is powered on, and forms a refrigerant passage between the compressor 4 and the first outdoor unit heat exchanger 7 when it is powered off; the second four-way valve 8a forms a refrigerant passage between the second outdoor unit heat exchanger 8 and the low-pressure air pipe 12a when it is powered on, and forms a refrigerant passage between the compressor 4 and the second outdoor unit heat exchanger 8 when it is powered off; the third four-way valve 10 forms a refrigerant passage between the compressor 4 and the high-pressure air pipe 13a when it is powered on, and does not form a refrigerant passage between the compressor 4 and the high-pressure air pipe 13a when it is powered off.

[0076] Please also read Figure 1 , wherein the first four-way valve 7a is in the power-on state (ON), the second four-way valve 8a is in the power-off state (OFF), and the third four-way valve 10 is in the power-on state (ON). Figure 1 This is only a schematic diagram of an outdoor unit switching from the main heating mode to the second defrosting mode in one embodiment, and does not constitute a limitation on the heat recovery air conditioner used in the present invention.

[0077] Furthermore, the method comprises:

[0078] When the first defrost mode is turned on, the first four-way valve 7a is controlled to be powered off (OFF), the second four-way valve 8a is powered on (ON), and the third four-way valve 10 is powered on (ON).

[0079] Exemplarily, when the first defrost mode is running, the refrigerant passes through the compressor 4 to become a high-temperature and high-pressure gas. After passing through the oil separator 5, it is divided into two paths and flows to the first outdoor unit heat exchanger 7 and the high-pressure gas pipe 13a respectively. Among them, after the refrigerant in the high-pressure gas pipe 13a passes through the indoor unit heat exchanger in the heating mode, part of the refrigerant passes through the liquid pipe 11a and merges with the refrigerant passing through the first outdoor unit heat exchanger 7. After the merger, it passes through the second outdoor unit heat exchanger 8 and the gas-liquid separator 6 in sequence and then returns to the compressor 4, forming a first refrigerant cycle; at the same time, another part of the refrigerant passes through the indoor unit heat exchanger in the heating mode and flows to the indoor unit heat exchanger in the cooling mode, passes through the low-pressure gas pipe 12a to the gas-liquid separator 6 and then returns to the compressor 4, forming a second refrigerant cycle.

[0080] At this time, the first outdoor unit heat exchanger 7 serves as a condenser, and the second outdoor unit heat exchanger 8 serves as an evaporator; the indoor unit heat exchanger in the heating mode serves as a condenser, and the indoor unit heat exchanger in the cooling mode serves as an evaporator.

[0081] The above embodiment is the refrigerant circulation after the outdoor unit is switched from the main heating mode to the first defrost mode. If the outdoor unit is switched from the heating mode to the first defrost mode, only the first refrigerant circulation exists. The refrigerant in the high-pressure gas pipe 13a passes through the indoor unit heat exchanger in the heating mode, passes through the liquid pipe 11a, and merges with the refrigerant passing through the first outdoor unit heat exchanger 7. No second refrigerant circulation is required.

[0082] When the second defrost mode is turned on, the first four-way valve 7a is controlled to be powered on (ON), the second four-way valve 8a is controlled to be powered off (OFF), and the third four-way valve 10 is controlled to be powered on (ON).

[0083] In this example, see Figure 1 As shown, when the second defrost mode is running, the refrigerant passes through the compressor 4 to become a high-temperature and high-pressure gas. After passing through the oil separator 5, it is divided into two paths and flows to the second outdoor unit heat exchanger 8 and the high-pressure gas pipe 13a respectively. Among them, after the refrigerant in the high-pressure gas pipe 13a passes through the indoor unit heat exchanger in the heating mode (the first indoor unit heat exchanger 1d and the second indoor unit heat exchanger 2d in the figure), part of the refrigerant passes through the liquid pipe 11a and merges with the refrigerant passing through the second outdoor unit heat exchanger 8. After the merger, it passes through the first outdoor unit heat exchanger 7 and the gas-liquid separator 6 in sequence and then returns to the compressor 4, forming a first refrigerant cycle; at the same time, another part of the refrigerant passes through the indoor unit heat exchanger in the heating mode and flows to the indoor unit heat exchanger in the cooling mode (the third indoor unit heat exchanger 3d in the figure), passes through the low-pressure gas pipe 12a to the gas-liquid separator 6 and then returns to the compressor 4, forming a second refrigerant cycle.

[0084] Furthermore, in this embodiment, in order to ensure that the indoor unit can be cooled and heated at the same time and smoothly form the above-mentioned first refrigerant cycle and second refrigerant cycle, the first high-pressure air pipe valve 1g is opened and the first low-pressure air pipe valve 1f is closed; the second high-pressure air pipe valve 2g is opened and the second low-pressure air pipe valve 2f is closed; the third high-pressure air pipe valve 3g is closed and the third low-pressure air pipe valve 3f is opened.

[0085] At this time, the first outdoor unit heat exchanger 7 serves as an evaporator, and the second outdoor unit heat exchanger 8 serves as a condenser; the indoor unit heat exchanger in the heating mode serves as a condenser, and the indoor unit heat exchanger in the cooling mode serves as an evaporator.

[0086] The above embodiment is the refrigerant circulation after the outdoor unit is switched from the main heating mode to the second defrost mode. If the outdoor unit is switched from the heating mode to the second defrost mode, only the first refrigerant circulation exists. The refrigerant in the high-pressure gas pipe 13a passes through the indoor unit heat exchanger in the heating mode, passes through the liquid pipe 11a, and merges with the refrigerant passing through the second outdoor unit heat exchanger 8. No second refrigerant circulation is required.

[0087] Furthermore, in one embodiment, a liquid shutoff valve corresponding to each indoor unit is provided on the liquid pipe 11a, and the method further includes: in response to detecting a refrigerant leakage, the liquid shutoff valve is closed to cut off the refrigerant passage between the liquid pipe and the corresponding indoor unit.

[0088] Specifically, the first indoor unit 1 b corresponds to the first liquid shutoff valve 1 e , the second indoor unit 2 b corresponds to the second liquid shutoff valve 2 e , and the third indoor unit 3 b corresponds to the third liquid shutoff valve 3 e .

[0089] When a flammable refrigerant is used, a liquid shutoff valve can be provided to effectively ensure indoor safety; when a non-flammable refrigerant is used, the liquid shutoff valve may not be provided.

[0090] In addition, the heat recovery air conditioner is also provided with a first valve box 1a, a second valve box 2a and a third valve box 3a; the first liquid shut-off valve 1e and the first low-pressure air pipe valve 1f and the first high-pressure air pipe valve 1g are arranged in the first valve box 1a; the second liquid shut-off valve 2e and the second low-pressure air pipe valve 2f and the second high-pressure air pipe valve 2g are arranged in the second valve box 2a; the third liquid shut-off valve 3e and the third low-pressure air pipe valve 3f and the third high-pressure air pipe valve 3g are arranged in the third valve box 3a.

[0091] The heat recovery air conditioner is also provided with a plurality of electronic expansion valves and a plurality of stop valves. Figure 1 , including a first indoor unit electronic expansion valve 1c, a second indoor unit electronic expansion valve 2c, a third indoor unit electronic expansion valve 3c, a first outdoor unit electronic expansion valve 7c, a second outdoor unit electronic expansion valve 8c: a liquid stop valve 11, a low-pressure gas pipe stop valve 12, and a high-pressure gas pipe stop valve 13.

[0092] In order to facilitate heat dissipation, the outdoor unit 14 is also provided with an external fan 9, and each of the indoor units is also provided with an internal fan.

[0093] In addition, the cooling mode or the main cooling mode can be switched by controlling the states of the three four-way valves. At this time, the first four-way valve 7a, the second four-way valve 8a and the third four-way valve 10 need to be powered off.

[0094] Furthermore, in one embodiment, the outdoor unit is further provided with a first defrost sensor and a second defrost sensor, which are used to collect temperature values ​​of the first outdoor unit heat exchanger and the second outdoor unit heat exchanger respectively; the method further comprises:

[0095] Based on the temperature value data collected by the first defrost sensor and the second defrost sensor, determining whether the first outdoor unit heat exchanger and the second outdoor unit heat exchanger have reached a preset defrost temperature value;

[0096] If the first defrost sensor reaches the defrost temperature value first, the first defrost mode is turned on;

[0097] If the second defrost sensor reaches the defrost temperature value first, the second defrost mode is turned on.

[0098] In a technical solution of the above heat recovery air conditioner control method, after the outdoor unit is switched from the heating mode or the main heating mode to the first defrost mode or the second defrost mode, the method further includes:

[0099] After the first defrost mode or the second defrost mode is completed, determining whether to continue defrosting;

[0100] If yes, re-acquire the temperature value data collected by the first defrost sensor and the second defrost sensor, and return to the step of "determining whether the first outdoor unit heat exchanger and the second outdoor unit heat exchanger have reached the preset defrost temperature value based on the temperature value data collected by the first defrost sensor and the second defrost sensor";

[0101] If not, the defrosting is finished and the outdoor unit returns to the heating mode or the main heating mode.

[0102] Exemplarily, in one embodiment, the determination of whether to continue defrosting may be based on the defrost program that has been run. If the first defrost mode and the second defrost mode have been run in this defrost, there is no need to continue defrosting; otherwise, defrosting needs to continue.

[0103] Based on the above steps S21-S22, based on the control of the states of the three four-way valves, the outdoor unit switches from the heating mode or the main heating mode to the first defrost mode or the second defrost mode, so that the indoor unit continues to heat or the main heating mode while the outdoor unit is defrosting, thereby optimizing the indoor temperature experience.

[0104] In order to fully illustrate the heat recovery air conditioner control method, the present invention also provides an embodiment. Figure 3 .

[0105] Figure 3 FIG. 1 is a detailed flow chart of a heat recovery air conditioner control method according to an embodiment of the present invention; Figure 3 As shown, the heat recovery air conditioner control method includes the following steps S31 to S39.

[0106] Step S31, determine whether the outdoor unit is in heating mode or main heating mode; if it is in heating mode or main heating mode, execute step S33; if it is not in heating mode or main heating mode, execute step S32, no defrosting is required.

[0107] Step S33: Based on the first defrost sensor and the second defrost sensor, the temperature value data T of the first outdoor heat exchanger is collected respectively. def1 and the temperature value data T of the second outdoor unit heat exchanger def2 .

[0108] Step S34, determine T def1 or T def2 First reach the preset defrost temperature value T def-tar .

[0109] If T def1 First reach the preset defrost temperature value T def-tar , then execute step S35:

[0110] Step S35, setting the first four-way valve: OFF, the second four-way valve: ON, and the third four-way valve: ON.

[0111] Step S36: the first outdoor unit heat exchanger is defrosted, and the indoor unit continues heating or mainly heats.

[0112] If T def2 First reach the preset defrost temperature value T def-tar , then execute step S37:

[0113] Step S37, setting the first four-way valve: ON, the second four-way valve: OFF, and the third four-way valve: ON.

[0114] Step S38: the second outdoor unit heat exchanger is defrosted, and the indoor unit continues heating or mainly heats.

[0115] After the above step S36 or step S38 is completed, step S39 is continued to be executed to determine whether it is necessary to continue defrosting.

[0116] If so, the process returns to step S33, and after the outdoor unit heat exchanger is alternately defrosted, the defrosting ends; if not, the defrosting ends directly.

[0117] It should be pointed out that although the various steps in the above embodiments are described in a specific order, those skilled in the art can understand that in order to achieve the effects of the present invention, different steps do not have to be performed in such an order. They can be performed simultaneously (in parallel) or in other orders. These changes are within the scope of protection of the present invention.

[0118] Furthermore, the present invention also provides a heat recovery air conditioner control system.

[0119] The heat recovery air conditioner includes an outdoor unit and multiple indoor units, the outdoor unit includes a first outdoor unit heat exchanger, a second outdoor unit heat exchanger and a compressor, each of the indoor units includes at least one indoor unit heat exchanger, and the indoor unit heat exchanger is respectively connected to a liquid pipe, a low-pressure gas pipe and a high-pressure gas pipe; the heat recovery air conditioner is provided with at least three four-way valves, wherein the first four-way valve selectively connects the first outdoor unit heat exchanger with the low-pressure gas pipe, or the compressor with the first outdoor unit heat exchanger, the second four-way valve selectively connects the second outdoor unit heat exchanger with the low-pressure gas pipe, or the compressor with the second outdoor unit heat exchanger; the third four-way valve selectively controls the connection between the compressor and the high-pressure gas pipe.

[0120] See attached Figure 4 , Figure 4 FIG. 1 is a main structural block diagram of a heat recovery air conditioner control system according to an embodiment of the present invention. Figure 4 As shown, the heat recovery air conditioner control system in the embodiment of the present invention mainly includes an instruction acquisition module 41 and a defrost control module 42. In some embodiments, the instruction acquisition module 41 and the defrost control module 42 can be combined into one module. In some embodiments, the instruction acquisition module 41 can be configured to obtain a defrost instruction for the outdoor unit to switch from a heating mode or a main heating mode to a first defrost mode or a second defrost mode. The defrost control module 42 can be configured to control the first outdoor unit heat exchanger to defrost if the first defrost mode is turned on, and the indoor unit continues to heat or the main heating; if the second defrost mode is turned on, the second outdoor unit heat exchanger is controlled to defrost, and the indoor unit continues to heat or the main heating.

[0121] In one implementation, the description of the specific implementation functions can refer to step S21-step S22.

[0122] The heat recovery air conditioner control system is used to execute Figure 2 The heat recovery air conditioner control method embodiment shown in the figure has similar technical principles, technical problems solved and technical effects produced. Technicians in this technical field can clearly understand that for the convenience and conciseness of description, the specific working process and related instructions of the heat recovery air conditioner control system can refer to the contents described in the embodiment of the heat recovery air conditioner control method, which will not be repeated here.

[0123] Further, it should be understood that since the setting of each module is only for illustrating the functional units of the heat recovery air conditioner control system of the present invention, the physical devices corresponding to these modules can be the processor itself, or a part of the software in the processor, a part of the hardware, or a part of the combination of software and hardware. Therefore, the number of each module in the figure is only schematic.

[0124] It is understood by those skilled in the art that the modules in the heat recovery air conditioner control system can be adaptively split or merged. Such splitting or merging of specific modules will not cause the technical solution to deviate from the principle of the present invention, and therefore, the technical solutions after splitting or merging will fall within the protection scope of the present invention.

[0125] It is understood by those skilled in the art that the present invention implements all or part of the processes in the method of the above embodiment, and can also be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable storage medium may include: any entity or device, medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory, random access memory, electric carrier signal, telecommunication signal and software distribution medium that can carry the computer program code. It should be noted that the content contained in the computer-readable storage medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable storage media do not include electric carrier signals and telecommunication signals.

[0126] Furthermore, the present invention also provides a computer-readable storage medium. In a computer-readable storage medium embodiment according to the present invention, the computer-readable storage medium can be configured to store a program for executing the heat recovery air conditioner control method of the above method embodiment, and the program can be loaded and run by the processor to implement the above heat recovery air conditioner control method. For ease of explanation, only the parts related to the embodiment of the present invention are shown. For specific technical details not disclosed, please refer to the method part of the embodiment of the present invention. The computer-readable storage medium can be a storage device formed by various electronic devices. Optionally, the computer-readable storage medium in the embodiment of the present invention is a non-temporary computer-readable storage medium.

[0127] Furthermore, the present invention also provides an electronic device. Figure 5 , Figure 5 It is a main structural block diagram of an electronic device for executing the heat recovery air conditioner control method of the present invention.

[0128] like Figure 5 As shown, in an electronic device embodiment according to the present invention, the electronic device includes a processor 501 and a memory 502, the memory 502 can be configured to store a program code 503 for executing the heat recovery air conditioner control method of the above method embodiment, and the processor 501 can be configured to execute the program code 503 in the memory 502, the program code 503 including but not limited to the program code 503 for executing the heat recovery air conditioner control method of the above method embodiment. For ease of explanation, only the part related to the embodiment of the present invention is shown, and for specific technical details not disclosed, please refer to the method part of the embodiment of the present invention.

[0129] Furthermore, the present invention also provides a heat recovery air conditioner, comprising a heat recovery air conditioner body and the above-mentioned heat recovery air conditioner control system and / or the above-mentioned electronic equipment.

[0130] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0131] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A heat recovery air conditioner control method, characterized in that: The heat recovery air conditioner comprises an outdoor unit and a plurality of indoor units, wherein the outdoor unit comprises a first outdoor unit heat exchanger, a second outdoor unit heat exchanger and a compressor, and each of the indoor units comprises at least one indoor unit heat exchanger, and the indoor unit heat exchanger is respectively connected to a liquid pipe, a low-pressure gas pipe and a high-pressure gas pipe; the heat recovery air conditioner is provided with at least three four-way valves, wherein the first four-way valve selectively connects the first outdoor unit heat exchanger with the low-pressure gas pipe, or the compressor with the first outdoor unit heat exchanger; the second four-way valve selectively connects the second outdoor unit heat exchanger with the low-pressure gas pipe, or the compressor with the second outdoor unit heat exchanger; the third four-way valve selectively controls the connection between the compressor and the high-pressure gas pipe; the method comprises: In response to a defrost command, the outdoor unit switches from a heating mode or a main heating mode to a first defrost mode or a second defrost mode based on control of the states of the three four-way valves; If the first defrost mode is turned on, the first outdoor unit heat exchanger is defrosted, and the indoor unit continues to heat or mainly heats; if the second defrost mode is turned on, the second outdoor unit heat exchanger is defrosted, and the indoor unit continues to heat or mainly heats.

2. The method according to claim 1, characterized in that The first four-way valve forms a refrigerant passage between the first outdoor unit heat exchanger and the low-pressure gas pipe when it is powered on, and forms a refrigerant passage between the compressor and the first outdoor unit heat exchanger when it is powered off; the second four-way valve forms a refrigerant passage between the second outdoor unit heat exchanger and the low-pressure gas pipe when it is powered on, and forms a refrigerant passage between the compressor and the second outdoor unit heat exchanger when it is powered off; The third four-way valve forms a refrigerant passage between the compressor and the high-pressure gas pipe when it is powered on, and does not form a refrigerant passage between the compressor and the high-pressure gas pipe when it is powered off; the method comprises: When the first defrost mode is turned on, the first four-way valve is powered off, the second four-way valve is powered on, and the third four-way valve is powered on; When the second defrost mode is turned on, the first four-way valve is powered on, the second four-way valve is powered off, and the third four-way valve is powered on.

3. The method according to claim 2, characterized in that The outdoor unit is switched from a heating mode or a main heating mode to a first defrosting mode or a second defrosting mode, and the method further includes: When the outdoor unit is in a heating mode or a main heating mode, the first four-way valve is controlled to be powered on, the second four-way valve is controlled to be powered on, and the third four-way valve is controlled to be powered on.

4. The method according to claim 1, characterized in that: The liquid pipe is provided with a liquid shutoff valve corresponding to each indoor unit, and the method further comprises: In response to detecting a refrigerant leakage, the liquid shutoff valve is closed to cut off a refrigerant passage between the liquid pipe and the corresponding indoor unit.

5. The method according to any one of claims 1 to 4, characterized in that The outdoor unit is also provided with a first defrost sensor and a second defrost sensor, which are used to collect temperature values ​​of the first outdoor unit heat exchanger and the second outdoor unit heat exchanger respectively; the method further includes: Based on the temperature value data collected by the first defrost sensor and the second defrost sensor, determining whether the first outdoor unit heat exchanger and the second outdoor unit heat exchanger have reached a preset defrost temperature value; If the first defrost sensor reaches the defrost temperature value first, the first defrost mode is turned on; If the second defrost sensor reaches the defrost temperature value first, the second defrost mode is turned on.

6. The method according to claim 5, characterized in that After the outdoor unit is switched from the heating mode or the main heating mode to the first defrost mode or the second defrost mode, the method further includes: After the first defrost mode or the second defrost mode is completed, determining whether to continue defrosting; If yes, re-acquire the temperature value data collected by the first defrost sensor and the second defrost sensor, and return to the step "based on the temperature value data collected by the first defrost sensor and the second defrost sensor, determine whether the first outdoor unit heat exchanger and the second outdoor unit heat exchanger have reached the preset defrost temperature value"; If not, the defrosting is finished and the outdoor unit returns to the heating mode or the main heating mode.

7. A heat recovery air conditioner control system, characterized in that: The heat recovery air conditioner comprises an outdoor unit and a plurality of indoor units, wherein the outdoor unit comprises a first outdoor unit heat exchanger, a second outdoor unit heat exchanger and a compressor, and each of the indoor units comprises at least one indoor unit heat exchanger, and the indoor unit heat exchanger is respectively connected to a liquid pipe, a low-pressure gas pipe and a high-pressure gas pipe; the heat recovery air conditioner is provided with at least three four-way valves, wherein the first four-way valve selectively connects the first outdoor unit heat exchanger with the low-pressure gas pipe, or the compressor with the first outdoor unit heat exchanger; the second four-way valve selectively connects the second outdoor unit heat exchanger with the low-pressure gas pipe, or the compressor with the second outdoor unit heat exchanger; the third four-way valve selectively controls the connection between the compressor and the high-pressure gas pipe; the system comprises: An instruction acquisition module is used to acquire a defrost instruction for the outdoor unit to switch from a heating mode or a main heating mode to a first defrost mode or a second defrost mode; The defrost control module controls the first outdoor unit heat exchanger to defrost if the first defrost mode is turned on, and the indoor unit continues to heat or the main unit heats; if the second defrost mode is turned on, the second outdoor unit heat exchanger is controlled to defrost, and the indoor unit continues to heat or the main unit heats.

8. A computer-readable storage medium storing a plurality of program codes, characterized in that: The program code is suitable for being loaded and run by a processor to execute the heat recovery air conditioner control method according to any one of claims 1 to 6.

9. An electronic device, comprising a processor and a memory, wherein the memory is suitable for storing a plurality of program codes, characterized in that: The program code is suitable for being loaded and run by the processor to execute the heat recovery air conditioner control method according to any one of claims 1 to 6.

10. A heat recovery air conditioner, characterized in that: It comprises a heat recovery air conditioner body and the heat recovery air conditioner control system described in claim 7 and / or the electronic device described in claim 9.

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