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

Abstract

The present application relates to the air conditioning technical field, specifically provide a kind of heat recovery air conditioner control method, system, medium, electronic equipment and air conditioner, to solve the problem that heat recovery air conditioner cannot ensure indoor unit continuous heating or main heating when outdoor unit defrosting.It is for this purpose, the heat recovery air conditioner control method of the present application includes: in response to defrosting instruction, based on the control to the three four-way valve state, the outdoor unit is switched from heating mode or main heating mode to first defrosting mode or second defrosting mode;If open first defrosting mode, first outdoor unit heat exchanger defrost, indoor unit continuous heating or main heating;If open second defrosting mode, second outdoor unit heat exchanger defrost, indoor unit continuous heating or main heating.Achieve the effect that indoor unit continuous heating or main heating while outdoor unit defrosting, optimize the temperature experience of indoor.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, specifically providing a control method, system, medium, electronic equipment, and air conditioner for a heat recovery air conditioner. Background Technology

[0002] When the outdoor environment is cold and the indoor unit of the air conditioner is used for heating, frost can easily form on the heat exchanger of the outdoor unit, which can lead to increased energy consumption, reduced heating efficiency, or even prevent the air conditioner from working properly.

[0003] When the outdoor unit of an existing air conditioner has a lot of frost, it usually switches the indoor unit 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, it closes the indoor unit fan and the indoor unit air outlet to prevent cold air from entering the room.

[0004] However, the defrosting process in existing technologies usually lasts about 10 minutes. During this time, the indoor unit cannot heat or blow hot air, which still affects the perceived indoor temperature. Furthermore, when the outdoor unit temperature is lower, defrosting needs to be performed more frequently, resulting in frequent shutdowns of the indoor heating system and a poor user experience.

[0005] Especially for heat recovery air conditioners with complex refrigerant pathways, where some indoor units may be heating and others cooling, it is even more difficult to defrost the outdoor unit while ensuring that the indoor unit maintains its original airflow mode.

[0006] Accordingly, there is a need in the field for a new heat recovery air conditioner control scheme to solve the above problems. Summary of the Invention

[0007] To overcome the above-mentioned defects, this invention is proposed, providing 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 heat recovery air conditioners cannot ensure continuous heating of the indoor unit or main heating of the unit when the outdoor unit is defrosting.

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

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

[0010] If the first defrost mode is activated, the heat exchanger of the first outdoor unit will defrost, while the indoor unit will continue to heat or the main unit will continue to heat. If the second defrost mode is activated, the heat exchanger of the second outdoor unit will defrost, while the indoor unit will continue to heat or the main unit will continue to heat.

[0011] In one 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 energized, and forms a refrigerant passage between the compressor and the first outdoor unit heat exchanger when de-energized; the second four-way valve forms a refrigerant passage between the second outdoor unit heat exchanger and the low-pressure gas pipe when energized, and forms a refrigerant passage between the compressor and the second outdoor unit heat exchanger when de-energized; the third four-way valve forms a refrigerant passage between the compressor and the high-pressure gas pipe when energized, and does not form a refrigerant passage between the compressor and the high-pressure gas pipe when de-energized; the method includes:

[0012] When the first defrosting mode is activated, the first four-way valve is de-energized, the second four-way valve is energized, and the third four-way valve is energized.

[0013] When the second defrosting mode is activated, the first four-way valve is energized, the second four-way valve is de-energized, and the third four-way valve is energized.

[0014] In one technical solution of the above-mentioned heat recovery air conditioner control method, 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:

[0015] When the outdoor unit is in heating mode or main heating mode, the first four-way valve is energized, the second four-way valve is energized, and the third four-way valve is energized.

[0016] In one technical solution of the above-mentioned heat recovery air conditioner control method, the liquid pipe is provided with a liquid shut-off valve corresponding to each indoor unit, and the method further includes:

[0017] In response to the detection of refrigerant leakage, the liquid shut-off valve closes, cutting off the refrigerant passage between the liquid pipe and the corresponding indoor unit.

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

[0019] Based on the temperature data collected by the first defrost sensor and the second defrost sensor, it is determined whether the first outdoor unit heat exchanger and the second outdoor unit heat exchanger have reached the preset defrost temperature value.

[0020] If the first defrost sensor reaches the defrost temperature value first, then the first defrost mode is activated;

[0021] If the second defrost sensor reaches the defrost temperature value first, the second defrost mode will be activated.

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

[0023] After the first or second defrost mode is completed, determine whether defrosting needs to continue.

[0024] If so, then reacquire the temperature data collected by the first defrost sensor and the second defrost sensor, and return to the step "Based on the temperature 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".

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

[0026] In a second aspect, the present invention provides a heat recovery air conditioner control system, the heat recovery air conditioner including an outdoor unit and multiple indoor units, the outdoor unit including a first outdoor unit heat exchanger, a second outdoor unit heat exchanger, and a compressor, each indoor unit including at least one indoor unit heat exchanger, the indoor unit heat exchanger being 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 includes:

[0027] The instruction acquisition module acquires the defrost instruction of the outdoor unit to switch from heating mode or main heating mode to the first defrost mode or the second defrost mode.

[0028] The defrosting control module, if the first defrosting mode is activated, controls the heat exchanger of the first outdoor unit to defrost, while the indoor unit continues to heat or the main unit heats; if the second defrosting mode is activated, controls the heat exchanger of the second outdoor unit to defrost, while the indoor unit continues to heat or the main unit heats.

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

[0030] In a fourth aspect, an electronic device is provided, comprising a processor and a memory, the memory being adapted to store a plurality of program codes, the program codes being adapted to be loaded and run by the processor to perform the heat recovery air conditioner control method described in any of the above-described technical solutions.

[0031] In a fifth aspect, a heat recovery air conditioner is provided, including a heat recovery air conditioner body, the aforementioned heat recovery air conditioner control system, and / or the aforementioned electronic equipment.

[0032] The present invention comprises one or more of the following technical solutions:

[0033] Beneficial effects:

[0034] In implementing the technical solution of 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 as to achieve the effect of continuous heating or main heating of the indoor unit while the outdoor unit is defrosting, thereby optimizing the indoor temperature experience. Attached Figure Description

[0035] The disclosure of this invention will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. Furthermore, similar numbers in the drawings are used to denote similar components, wherein:

[0036] Figure 1 This is a schematic diagram of the structure of a heat recovery air conditioner according to an embodiment of the present invention;

[0037] Figure 2 This is a flowchart of the main steps of a heat recovery air conditioner control method according to an embodiment of the present invention;

[0038] Figure 3 This is a detailed flowchart of the steps of a heat recovery air conditioner control method according to an embodiment of the present invention;

[0039] Figure 4 This is a main structural block diagram of a heat recovery air conditioner control system according to an embodiment of the present invention;

[0040] Figure 5 This is a main structural block diagram of an electronic device used to implement the heat recovery air conditioner control method of the present invention.

[0041] List of reference numerals :

[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: First indoor unit electronic expansion valve; 2c: Second indoor unit electronic expansion valve; 3c: Third indoor unit electronic expansion valve;

[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 gas valve; 2f: Second low-pressure gas valve; 3f: Third low-pressure gas valve;

[0048] 1g: First high-pressure gas valve; 2g: Second high-pressure gas valve; 3g: High and low pressure gas valves;

[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: Third four-way valve;

[0054] 11: Liquid shut-off valve; 11a: Liquid pipe;

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

[0056] 13: High-pressure air pipe shut-off valve; 13a: High-pressure air pipe;

[0057] 14: Outdoor unit;

[0058] 41: Command acquisition module; 42: Defrosting control module;

[0059] 500: Electronic device; 501: Processor; 502: Memory; 503: Program code. Detailed Implementation

[0060] Some embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0061] In the description of this invention, "module" and "processor" can include hardware, software, or a combination of both. A module can include hardware circuitry, various suitable sensors, communication ports, memory, and may also include software components, such as program code, or a combination of software and hardware. A processor can be a central processing unit, microprocessor, image processor, digital signal processor, or any other suitable processor. The processor has data and / or signal processing capabilities. The processor can be implemented in software, in hardware, or a combination of both. Non-transitory computer-readable storage media includes any suitable medium capable of storing program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random access memory, etc. 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 terms "at least one A or B" or "at least one of A and B" have a similar meaning to "A and / or B" and can include only A, only B, or A and B. The singular terms "a" or "this" can also include plural forms.

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

[0063] In order to ensure that the indoor unit continues to heat or the main unit heats up during the defrosting of the outdoor unit of a heat recovery air conditioner, the present invention provides a control method for a heat recovery air conditioner.

[0064] The heat recovery air conditioner control method of the present invention is applied to heat recovery air conditioners. Please refer to [link / reference]. Figure 1 , Figure 1 This is a 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, and 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 indoor unit includes at least one indoor unit heat exchanger 1d, 2d, or 3d. The indoor unit heat exchangers are respectively connected to a liquid pipe 11a, a low-pressure gas pipe 12a, and a high-pressure gas pipe 13a. The heat recovery air conditioner is equipped with at least three four-way valves 7a, 8a, and 10. The first four-way valve 7a selectively connects the first outdoor unit heat exchanger 7 to the low-pressure gas pipe 12a, or the compressor 4 to the first outdoor unit heat exchanger 7. The second four-way valve 8a selectively connects the second outdoor unit heat exchanger 8 to the low-pressure gas pipe 12a, or the compressor 4 to 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 unit heat exchanger 7 and the second outdoor unit heat exchanger 8 can be divided vertically as shown in the figure, or they can be divided horizontally, or 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 capillary tubes, and the two interfaces connected by the capillary tubes cannot form a passage, so that the first four-way valve 7a, the second four-way valve 8a, and the third four-way valve 10 satisfy the above-described connection relationship. In other embodiments of the present invention, four-way valves that satisfy the above-described connection relationship can also be obtained by other means.

[0068] See appendix Figure 2 , Figure 2 This is a flowchart illustrating 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 this embodiment of the invention mainly includes the following steps S21-S22.

[0069] Step S21: In response to the defrost command, 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 heating mode or main heating mode to a first defrost mode or a second defrost mode. The method further includes: when the outdoor unit 14 is in heating mode or main heating mode, controlling the first four-way valve 7a to be energized (ON), the second four-way valve 8a to be energized (ON), and the third four-way valve 10 to be energized (ON).

[0071] In this embodiment, when the outdoor unit 14 operates in heating mode, all three indoor units—the first indoor unit 1b, the second indoor unit 2b, and the third indoor unit 3b—are heating; when the outdoor unit 14 operates in main heating mode, most of the indoor units are heating. For example, please refer to [link to relevant documentation]. Figure 1 The first indoor unit 1b and the second indoor unit 2b are used for heating, while the third indoor unit 3b is used for 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 system is not limited to the examples described above. Those skilled in the art can make the settings according to actual needs.

[0073] The first defrosting mode is the defrosting operation mode of the first outdoor unit heat exchanger 7, and the second defrosting mode is the defrosting operation mode of the second outdoor unit heat exchanger 8.

[0074] Step S22: If the first defrost mode is activated, the heat exchanger of the first outdoor unit defrosts, and the indoor unit continues to heat or the main unit heats; if the second defrost mode is activated, the heat exchanger of the second outdoor unit defrosts, and the indoor unit continues to heat or the main unit 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 gas pipe 12a when energized, and forms a refrigerant passage between the compressor 4 and the first outdoor unit heat exchanger 7 when de-energized; the second four-way valve 8a forms a refrigerant passage between the second outdoor unit heat exchanger 8 and the low-pressure gas pipe 12a when energized, and forms a refrigerant passage between the compressor 4 and the second outdoor unit heat exchanger 8 when de-energized; the third four-way valve 10 forms a refrigerant passage between the compressor 4 and the high-pressure gas pipe 13a when energized, and does not form a refrigerant passage between the compressor 4 and the high-pressure gas pipe 13a when de-energized.

[0076] Please refer to the following: Figure 1 The first four-way valve 7a is in the energized state (ON), the second four-way valve 8a is in the de-energized state (OFF), and the third four-way valve 10 is in the energized state (ON). Figure 1 This is merely a schematic diagram of the outdoor unit switching from the main operating heating mode to the second defrosting mode in one embodiment, and does not constitute a limitation on the heat recovery air conditioner used in this invention.

[0077] Furthermore, the method includes:

[0078] When the first defrosting mode is activated, the first four-way valve 7a is de-energized (OFF), the second four-way valve 8a is energized (ON), and the third four-way valve 10 is energized (ON).

[0079] For example, when the first defrost mode is running, the refrigerant becomes a high-temperature and high-pressure gas after passing through the compressor 4. After passing through the oil separator 5, it flows in two separate streams to the first outdoor unit heat exchanger 7 and the high-pressure gas pipe 13a, respectively. The refrigerant in the high-pressure gas pipe 13a passes through the indoor unit heat exchanger in the heating mode, and part of the refrigerant passes through the liquid pipe 11a and merges with the refrigerant that has passed through the first outdoor unit heat exchanger 7. After merging, it passes through the second outdoor unit heat exchanger 8 and the gas-liquid separator 6 in sequence before returning to the compressor 4, forming the first refrigerant cycle. At the same time, another part of the refrigerant that passes through the indoor unit heat exchanger in the heating mode 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 the second refrigerant cycle.

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

[0081] The above embodiment describes the refrigerant circulation after the outdoor unit switches from the main operating heating mode to the first defrost mode. If the outdoor unit switches from the operating 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, then passes through the liquid pipe 11a, and merges with the refrigerant that has passed through the first outdoor unit heat exchanger 7. No second refrigerant circulation is required.

[0082] When the second defrost mode is activated, the first four-way valve 7a is energized (ON), the second four-way valve 8a is de-energized (OFF), and the third four-way valve 10 is energized (ON).

[0083] In this embodiment, please refer to Figure 1 As shown, when the second defrost mode is running, the refrigerant becomes a high-temperature, high-pressure gas after passing through the compressor 4. After passing through the oil separator 5, it flows in two separate streams to the second outdoor unit heat exchanger 8 and the high-pressure gas pipe 13a. The refrigerant in the high-pressure gas pipe 13a passes through the indoor unit heat exchanger in heating mode (the first indoor unit heat exchanger 1d and the second indoor unit heat exchanger 2d in the figure). Part of the refrigerant then passes through the liquid pipe 11a and merges with the refrigerant that has passed through the second outdoor unit heat exchanger 8. After merging, it passes through the first outdoor unit heat exchanger 7 and the gas-liquid separator 6 in sequence before returning to the compressor 4, forming the first refrigerant cycle. At the same time, another part of the refrigerant that passes through the indoor unit heat exchanger in heating mode flows to the indoor unit heat exchanger in cooling mode (the third indoor unit heat exchanger 3d in the figure). It then passes through the low-pressure gas pipe 12a to the gas-liquid separator 6 before returning to the compressor 4, forming the second refrigerant cycle.

[0084] Furthermore, in this embodiment, in order to ensure that the indoor unit can simultaneously heat and cool, and smoothly form the first refrigerant cycle and the second refrigerant cycle, the first high-pressure gas pipe valve 1g is opened and the first low-pressure gas pipe valve 1f is closed; the second high-pressure gas pipe valve 2g is opened and the second low-pressure gas pipe valve 2f is closed; the third high-pressure gas pipe valve 3g is closed and the third low-pressure gas pipe valve 3f is opened.

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

[0086] The above embodiment describes the refrigerant circulation after the outdoor unit switches from the main operating heating mode to the second defrost mode. If the outdoor unit switches from the operating 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, then through the liquid pipe 11a, and merges with the refrigerant that has passed through the second outdoor unit heat exchanger 8, without the need for a second refrigerant circulation.

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

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

[0089] When using flammable refrigerant, installing a liquid shut-off valve can effectively ensure indoor safety; when using non-flammable refrigerant, the liquid shut-off valve may not be required.

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

[0091] The heat recovery air conditioner is also equipped with multiple electronic expansion valves and multiple shut-off valves. Please refer to [link / reference]. Figure 1 It includes an electronic expansion valve 1c for the first indoor unit, an electronic expansion valve 2c for the second indoor unit, an electronic expansion valve 3c for the third indoor unit, an electronic expansion valve 7c for the first outdoor unit, an electronic expansion valve 8c for the second outdoor unit, a liquid shut-off valve 11, a low-pressure gas pipe shut-off valve 12, and a high-pressure gas pipe shut-off valve 13.

[0092] To facilitate heat dissipation, the outdoor unit 14 is also equipped with an external fan 9, and each indoor unit is also equipped with an internal fan.

[0093] In addition, the three four-way valves can be switched to either cooling mode or main cooling mode. In this case, the first four-way valve 7a, the second four-way valve 8a, and the third four-way valve 10 need to be de-energized.

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

[0095] Based on the temperature data collected by the first defrost sensor and the second defrost sensor, it is determined whether the first outdoor unit heat exchanger and the second outdoor unit heat exchanger have reached the preset defrost temperature value.

[0096] If the first defrost sensor reaches the defrost temperature value first, then the first defrost mode is activated;

[0097] If the second defrost sensor reaches the defrost temperature value first, the second defrost mode will be activated.

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

[0099] After the first or second defrost mode is completed, determine whether defrosting needs to continue.

[0100] If so, then reacquire the temperature data collected by the first defrost sensor and the second defrost sensor, and return to the step "Based on the temperature 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".

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

[0102] For example, in one embodiment, the determination of whether defrosting needs to continue can be based on the defrosting program that has been running. If the first defrosting mode and the second defrosting mode have been run in this defrosting, then defrosting does not need to continue; otherwise, defrosting needs to continue.

[0103] Based on the above steps S21-S22, and 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 as to achieve the effect of continuous heating or main heating of the indoor unit while the outdoor unit is defrosting, thus optimizing the indoor temperature experience.

[0104] To fully illustrate the control method for a heat recovery air conditioner, this invention also provides an embodiment, please refer to the appendix. Figure 3 .

[0105] Figure 3 This is a detailed flowchart of the steps of a heat recovery air conditioner control method according to an embodiment of the present invention; as follows: Figure 3 As shown, the heat recovery air conditioner control method includes the following steps S31-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, proceed to step S33; if it is not in heating mode or main heating mode, proceed to step S32, and defrosting is not required.

[0107] Step S33: Based on the first defrost sensor and the second defrost sensor, the temperature value T of the first outdoor unit heat exchanger is collected respectively. def1 Temperature 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 proceed to step S35:

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

[0111] In step S36, the heat exchanger of the first outdoor unit defrosts, while the indoor unit continues to heat or the main unit heats.

[0112] If T def2 First, reach the preset defrost temperature value T. def-tar Then proceed to step S37:

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

[0114] In step S38, the second outdoor unit heat exchanger defrosts, while the indoor unit continues heating or the main unit continues heating.

[0115] After completing step S36 or step S38, proceed to step S39 to determine whether defrosting is still required.

[0116] If yes, return to step S33 and complete the alternating defrosting of the outdoor unit heat exchanger, then the defrosting process ends; otherwise, the defrosting process ends directly.

[0117] It should be noted that although the steps in the above embodiments are described in a specific order, those skilled in the art will understand that in order to achieve the effects of the present invention, different steps do not necessarily have to be executed in such an order. They can be executed simultaneously (in parallel) or in other orders, and these variations are all 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 indoor unit includes at least one indoor unit heat exchanger, which is connected to a liquid pipe, a low-pressure gas pipe, and a high-pressure gas pipe, respectively. The heat recovery air conditioner is equipped with at least three four-way valves. 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.

[0120] See appendix Figure 4 , Figure 4 This 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 this embodiment of the 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 acquire a defrost instruction for the outdoor unit to switch from heating mode or main heating mode to a first defrost mode or a second defrost mode. The defrost control module 42 can be configured to, if the first defrost mode is activated, control the first outdoor unit heat exchanger to defrost, while the indoor unit continues to heat or operates in main heating mode; if the second defrost mode is activated, control the second outdoor unit heat exchanger to defrost, while the indoor unit continues to heat or operates in main heating mode.

[0121] In one implementation, a description of the specific function can be found in steps S21-S22.

[0122] The above-mentioned heat recovery air conditioner control system is used to perform Figure 2 The heat recovery air conditioner control method embodiments shown are similar in technical principle, the technical problems solved and the technical effects produced. Those skilled in the art can clearly understand that, for the sake of convenience and brevity, the specific working process and related descriptions of the heat recovery air conditioner control system can be referred to the content described in the embodiments of the heat recovery air conditioner control method, and will not be repeated here.

[0123] Furthermore, it should be understood that since the various modules are only provided to illustrate the functional units of the heat recovery air conditioner control system of the present invention, the physical devices corresponding to these modules may be the processor itself, or a part of the processor's software, hardware, or a combination of both. Therefore, the number of modules shown in the figure is merely illustrative.

[0124] Those skilled in the art will understand that the various 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 principles of this invention; therefore, the technical solutions after splitting or merging will fall within the protection scope of this invention.

[0125] Those skilled in the art will understand that all or part of the processes in the method of the above embodiment of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable storage medium can include any entity or device capable of carrying the computer program code, a medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory, a random access memory, an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc. It should be noted that the content included in the computer-readable storage medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable storage medium does not include electrical carrier signals and telecommunication signals.

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

[0127] Furthermore, the present invention also provides an electronic device. Please refer to the appendix. Figure 5 , Figure 5 This is a main structural block diagram of an electronic device used to implement the heat recovery air conditioner control method of the present invention.

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

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

[0130] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0131] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles 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 such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A heat recovery air conditioner control method, characterized by, 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, and the indoor unit heat exchanger is connected with 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 a 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; a 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; and a third four-way valve selectively controls the connection between the compressor and the high-pressure gas pipe; a capillary tube is arranged on each of the first four-way valve, the second four-way valve and the third four-way valve, and a passage cannot be formed between two interfaces connected by the capillary tube, and the method comprises the following steps: in response to a defrosting instruction, based on the control of the states of the three four-way valves, the outdoor unit is switched from a heating mode or a main body heating mode to a first defrosting mode or a second defrosting mode; if the first defrosting mode is started, the first outdoor unit heat exchanger defrosts, and the indoor unit continuously heats or main body heats; if the second defrosting mode is started, the second outdoor unit heat exchanger defrosts, and the indoor unit continuously heats or main body heats; the on-state of the first four-way valve forms a refrigerant passage between the first outdoor unit heat exchanger and the low-pressure gas pipe, and the off-state forms a refrigerant passage between the compressor and the first outdoor unit heat exchanger; the on-state of the second four-way valve forms a refrigerant passage between the second outdoor unit heat exchanger and the low-pressure gas pipe, and the off-state forms a refrigerant passage between the compressor and the second outdoor unit heat exchanger; and the on-state of the third four-way valve forms a refrigerant passage between the compressor and the high-pressure gas pipe, and the off-state does not form a refrigerant passage between the compressor and the high-pressure gas pipe; the method comprises the following steps: when the first defrosting mode is started, the first four-way valve is controlled to be off, the second four-way valve is controlled to be on, and the third four-way valve is controlled to be on; when the second defrosting mode is started, the first four-way valve is controlled to be on, the second four-way valve is controlled to be off, and the third four-way valve is controlled to be on; the outdoor unit is switched from the heating mode or the main body heating mode to the first defrosting mode or the second defrosting mode, and the method further comprises the following steps: when the outdoor unit is in the heating mode or the main body heating mode, the first four-way valve is controlled to be on, the second four-way valve is controlled to be on, and the third four-way valve is controlled to be on.

2. The method of claim 1, wherein, the liquid pipe is provided with a liquid cut-off valve corresponding to each indoor unit, and the method further comprises the following steps: in response to the detection of refrigerant leakage, the liquid cut-off valve is closed to cut off the refrigerant passage between the liquid pipe and the corresponding indoor unit.

3. The method of any one of claims 1-2, wherein, the outdoor unit is further provided with a first defrosting sensor and a second defrosting sensor for collecting temperature values of the first outdoor unit heat exchanger and the second outdoor unit heat exchanger respectively; and the method further comprises the following steps: based on the temperature value data collected by the first defrosting sensor and the second defrosting sensor, it is judged whether the first outdoor unit heat exchanger and the second outdoor unit heat exchanger reach a preset defrosting temperature value; if the first defrosting sensor reaches the defrosting temperature value first, the first defrosting mode is started. If the second defrost sensor reaches the defrost temperature value first, the second defrost mode is started.

4. The method of claim 3, wherein, After the outdoor unit switches from the heating mode or the main heating mode to the first defrost mode or the second defrost mode, the method further comprises: After the first defrost mode or the second defrost mode is completed, it is determined whether defrosting needs to be continued; If yes, the temperature value data collected by the first defrost sensor and the second defrost sensor is reacquired, and the step of "determining whether the first outdoor heat exchanger and the second outdoor heat exchanger reach the preset defrost temperature value based on the temperature value data collected by the first defrost sensor and the second defrost sensor" is returned to; If no, the defrosting is completed, and the outdoor unit returns to the heating mode or the main heating mode.

5. A heat recovery air conditioner control system characterized by comprising: The heat recovery air conditioner comprises an outdoor unit and a plurality of indoor units. The outdoor unit comprises a first outdoor heat exchanger, a second outdoor heat exchanger and a compressor. Each of the indoor units comprises at least one indoor heat exchanger, which is connected with 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. The first four-way valve selectively connects the first outdoor heat exchanger with the low-pressure gas pipe or the compressor with the first outdoor heat exchanger. The second four-way valve selectively connects the second outdoor heat exchanger with the low-pressure gas pipe or the compressor with the second outdoor heat exchanger. The third four-way valve selectively controls the connection between the compressor and the high-pressure gas pipe. Capillary tubes are arranged on the first four-way valve, the second four-way valve and the third four-way valve. No passage can be formed between two interfaces connected by the capillary tubes. The system comprises: an instruction acquisition module, which acquires a defrosting instruction for switching the outdoor unit from the heating mode or the main heating mode to the first defrost mode or the second defrost mode; a defrosting control module, which controls the first outdoor heat exchanger to defrost if the first defrost mode is started, and controls the indoor unit to continuously heat or main heat. If the second defrost mode is started, the second outdoor heat exchanger is controlled to defrost, and the indoor unit is controlled to continuously heat or main heat. The on-state of the first four-way valve forms a refrigerant passage between the first outdoor heat exchanger and the low-pressure gas pipe, and the off-state forms a refrigerant passage between the compressor and the first outdoor heat exchanger. The on-state of the second four-way valve forms a refrigerant passage between the second outdoor heat exchanger and the low-pressure gas pipe, and the off-state forms a refrigerant passage between the compressor and the second outdoor heat exchanger. The on-state of the third four-way valve forms a refrigerant passage between the compressor and the high-pressure gas pipe, and the off-state does not form a refrigerant passage between the compressor and the high-pressure gas pipe. When the first defrost mode is started, the first four-way valve is controlled to be off, the second four-way valve is controlled to be on, and the third four-way valve is controlled to be on. When the second defrost mode is started, the first four-way valve is controlled to be on, the second four-way valve is controlled to be off, and the third four-way valve is controlled to be on. When the outdoor unit is in the heating mode or the main heating mode, the first four-way valve is controlled to be on, the second four-way valve is controlled to be on, and the third four-way valve is controlled to be on.

6. A computer readable storage medium having stored therein a plurality of program codes, characterized in that, The program code is adapted to be loaded and run by the processor to execute the heat recovery air conditioner control method according to any one of claims 1 to 4.

7. An electronic device comprising a processor and a memory, the memory being adapted to store a plurality of program codes, characterized in that, The program code is adapted to be loaded and run by the processor to execute the heat recovery air conditioner control method according to any one of claims 1 to 4.

8. A heat recovery air conditioner characterized by comprising: The heat recovery air conditioner control system according to claim 5 and / or the electronic device according to claim 7 are included in the heat recovery air conditioner body.

Images