A control method, device, air conditioner and storage medium for an air conditioner

Abstract

The present invention discloses a control method, device, air conditioner and storage medium for an air conditioner. The method includes: in the cooling mode of the air conditioner, controlling the current opening degrees of the first throttling device and the second throttling device to be preset opening degrees; obtaining the ambient temperature of the indoor unit, denoted as the current indoor ambient temperature of the indoor unit; and obtaining the pipe temperature of the first indoor heat exchanger, denoted as the current pipe temperature of the first indoor heat exchanger; adjusting the current opening degrees of the first throttling device and the second throttling device according to the current indoor ambient temperature of the indoor unit, the current pipe temperature of the first indoor heat exchanger, and a preset indoor ambient temperature threshold. In this solution, by arranging a first indoor heat exchanger and a first throttling device between the second throttling device of the air conditioner and the second indoor heat exchanger, when the air conditioner operates in the cooling mode, by adjusting the opening degrees of the first throttling device and the second throttling device, it is possible to avoid water floating at the air outlet of the air conditioner and improve the user experience.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioners, and particularly relates to a control method, device, air conditioner and storage medium of an air conditioner, and more particularly to a control method, device, air conditioner and storage medium of an anti-condensation and efficient air conditioner. Background Art

[0002] When the air conditioner operates in cooling mode under high humidity conditions, after the air blown out from the air outlet of the air conditioner is mixed with the indoor air, once the temperature is lower than the dew point, it will cause water to be carried in the air blown out from the air outlet of the air conditioner, making it easy for water to float out of the air outlet of the air conditioner, seriously affecting the user experience.

[0003] The above content is only used to assist in understanding the technical solution of the present invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The object of the present invention is to provide a control method, device, air conditioner and storage medium of an air conditioner, so as to solve the problem that when the air conditioner operates in cooling mode under high humidity conditions, water is likely to float out of the air outlet of the air conditioner, seriously affecting the user experience, and achieve the effect of avoiding water floating out of the air outlet of the air conditioner and improving the user experience by setting a new indoor heat exchanger and a new throttling device between the outdoor throttling device of the air conditioner and the original indoor heat exchanger, and adjusting the opening degrees of the original throttling device and the new throttling device during the cooling operation of the air conditioner.

[0005] In a control method of an air conditioner provided by the present invention, the air conditioner includes: an indoor unit and an outdoor unit; the indoor unit includes: a first indoor heat exchanger, a first throttling device, and a second indoor heat exchanger; the outdoor unit includes: a compressor, a four-way valve, an outdoor heat exchanger, and a second throttling device; wherein, the exhaust port of the compressor is connected to the fourth valve port of the four-way valve after passing through the first valve port and the second valve port of the four-way valve, and then passing through the outdoor heat exchanger, the second throttling device, the first indoor heat exchanger, the first throttling device, and the second indoor heat exchanger; the third valve port of the four-way valve returns to the suction port of the compressor; the control method of the air conditioner includes: when the air conditioner operates in the cooling mode after startup, controlling the current opening degrees of the first throttling device and the second throttling device to be preset opening degrees, so that the first indoor heat exchanger warms up to reduce humidity, and the second indoor heat exchanger performs refrigeration and dehumidification; obtaining the ambient temperature of the indoor unit, denoted as the current indoor ambient temperature of the indoor unit; and obtaining the pipe temperature of the first indoor heat exchanger, denoted as the current pipe temperature of the first indoor heat exchanger; adjusting the current opening degrees of the first throttling device and the second throttling device according to the current indoor ambient temperature of the indoor unit, the current pipe temperature of the first indoor heat exchanger, and a preset indoor ambient temperature threshold, so as to control the refrigeration and dehumidification degree of the second indoor heat exchanger by adjusting the refrigerant temperature in the first indoor heat exchanger.

[0006] In some embodiments, the second indoor heat exchanger is installed in the air inlet direction of the indoor unit fan of the air conditioner; the first indoor heat exchanger is installed in the air outlet direction of the indoor unit fan of the air conditioner.

[0007] In some embodiments, according to the current indoor ambient temperature of the indoor unit, the current pipe temperature of the first indoor heat exchanger, and a preset indoor ambient temperature threshold, adjusting the current opening degree of the first throttling device and the current opening degree of the second throttling device includes: determining whether the current indoor ambient temperature of the indoor unit is greater than the sum of the current pipe temperature of the first indoor heat exchanger and the preset indoor ambient temperature threshold, and determining whether the current indoor ambient temperature of the indoor unit is less than the current pipe temperature of the first indoor heat exchanger; if it is determined that the current indoor ambient temperature of the indoor unit is greater than the sum of the current pipe temperature of the first indoor heat exchanger and the preset indoor ambient temperature threshold, controlling the current opening degree of the second throttling device to increase and controlling the current opening degree of the first throttling device to decrease; if it is determined that the current indoor ambient temperature of the indoor unit is less than or equal to the sum of the current pipe temperature of the first indoor heat exchanger and the preset indoor ambient temperature threshold and the current indoor ambient temperature of the indoor unit is greater than or equal to the current pipe temperature of the first indoor heat exchanger, controlling the current opening degrees of both the second throttling device and the first throttling device to be maintained at the preset opening degree; if it is determined that the current indoor ambient temperature of the indoor unit is less than the current pipe temperature of the first indoor heat exchanger, controlling the current opening degree of the second throttling device to decrease and controlling the current opening degree of the first throttling device to increase.

[0008] In some embodiments, it further includes: when the air conditioner operates in the heating mode after startup, controlling the current opening degree of the first throttling device to be the preset maximum opening degree and controlling the current opening degree of the second throttling device to be the preset opening degree to reduce the surface temperature of the first indoor heat exchanger; obtaining the operation duration of the air conditioner in the heating mode, denoted as the current operation duration of the air conditioner in the heating mode; and obtaining the pipe temperature of the outdoor heat exchanger, denoted as the current pipe temperature of the outdoor heat exchanger; determining whether the air conditioner needs to enter the heating defrosting mode according to the current operation duration of the air conditioner in the heating mode, the current pipe temperature of the outdoor heat exchanger, a first preset time threshold, a second preset time threshold, and a preset defrosting start temperature threshold; if it is determined that the air conditioner needs to enter the heating defrosting mode, controlling the air conditioner to switch from the heating mode to the heating defrosting mode, and when the air conditioner operates in the heating defrosting mode, adjusting the current opening degrees of the first throttling device and the second throttling device so that the indoor fan of the air conditioner can be directly restarted and switched to the heating mode after the heating defrosting mode ends.

[0009] In some embodiments, determining whether the air conditioner needs to enter the heating defrost mode based on the current operation duration of the air conditioner in the heating mode, the current pipe temperature of the outdoor heat exchanger, as well as a first preset time threshold, a second preset time threshold, and a preset defrost start temperature threshold includes: determining whether the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrost start temperature threshold, and determining whether the current operation duration of the air conditioner in the heating mode is less than the first preset time threshold; if it is determined that the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrost start temperature threshold and the current operation duration of the air conditioner in the heating mode is less than the first preset time threshold, then start timing to obtain the timing time, and determine whether this timing time is greater than the second preset time threshold: if so, determine that the air conditioner needs to enter the heating defrost mode, otherwise control the air conditioner to maintain its current state; if it is determined that the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrost start temperature threshold and the current operation duration of the air conditioner in the heating mode is greater than or equal to the first preset time threshold, then determine that the air conditioner needs to enter the heating defrost mode; if it is determined that the current pipe temperature of the outdoor heat exchanger is greater than the preset defrost start temperature threshold, then control the air conditioner to maintain its current state.

[0010] In some embodiments, controlling the air conditioner to switch from the heating mode to the heating defrost mode, and when the air conditioner is operating in the heating defrost mode, adjusting the current opening degree of the first throttling device and the current opening degree of the second throttling device includes: controlling the indoor unit fan of the air conditioner to stop rotating, controlling the air conditioner to switch from the heating mode to the heating defrost mode, adjusting the current opening degree of the first throttling device to the preset opening degree, and adjusting the current opening degree of the second throttling device to the preset maximum opening degree, so that during the defrosting process of the outdoor heat exchanger, the first indoor heat exchanger stores heat and the second indoor heat exchanger stores cold; determining whether the current pipe temperature of the outdoor heat exchanger is greater than the preset defrost start temperature threshold; if it is determined that the current pipe temperature of the outdoor heat exchanger is greater than the preset defrost start temperature threshold, then after controlling the air conditioner to exit the heating defrost mode, control the indoor unit fan of the air conditioner to restart, and control the air conditioner to directly switch from the heating defrost mode to the heating mode; if it is determined that the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrost start temperature threshold, then control the air conditioner to maintain its current state.

[0011] Matched with the above method, on the other hand, the present invention provides a control device for an air conditioner. The air conditioner includes: an indoor unit and an outdoor unit; the indoor unit includes: a first indoor heat exchanger, a first throttling device, and a second indoor heat exchanger; the outdoor unit includes: a compressor, a four-way valve, an outdoor heat exchanger, and a second throttling device; wherein, the exhaust port of the compressor, after passing through the first valve port and the second valve port of the four-way valve, then passes through the outdoor heat exchanger, the second throttling device, the first indoor heat exchanger, the first throttling device, and the second indoor heat exchanger, and is connected to the fourth valve port of the four-way valve; the third valve port of the four-way valve returns to the suction port of the compressor; the control device of the air conditioner includes: a control unit configured to, when the air conditioner operates in the cooling mode after startup, control the current opening degrees of the first throttling device and the second throttling device to be preset opening degrees, so that the first indoor heat exchanger warms up to reduce humidity, and the second indoor heat exchanger performs refrigeration and dehumidification; an acquisition unit configured to acquire the ambient temperature of the indoor unit, denoted as the current indoor ambient temperature of the indoor unit; and acquire the pipe temperature of the first indoor heat exchanger, denoted as the current pipe temperature of the first indoor heat exchanger; the control unit is further configured to adjust the current opening degrees of the first throttling device and the second throttling device according to the current indoor ambient temperature of the indoor unit, the current pipe temperature of the first indoor heat exchanger, and a preset indoor ambient temperature threshold, so as to control the refrigeration and dehumidification degree of the second indoor heat exchanger by adjusting the refrigerant temperature in the first indoor heat exchanger.

[0012] In some embodiments, the second indoor heat exchanger is installed in the air inlet direction of the indoor unit fan of the air conditioner; the first indoor heat exchanger is installed in the air outlet direction of the indoor unit fan of the air conditioner.

[0013] In some embodiments, the control unit adjusts the current opening degree of the first throttling device and the current opening degree of the second throttling device according to the current indoor environmental temperature of the indoor unit, the current pipe temperature of the first indoor heat exchanger, and a preset indoor environmental temperature threshold, including: determining whether the current indoor environmental temperature of the indoor unit is greater than the sum of the current pipe temperature of the first indoor heat exchanger and the preset indoor environmental temperature threshold, and determining whether the current indoor environmental temperature of the indoor unit is less than the current pipe temperature of the first indoor heat exchanger; if it is determined that the current indoor environmental temperature of the indoor unit is greater than the sum of the current pipe temperature of the first indoor heat exchanger and the preset indoor environmental temperature threshold, then controlling the current opening degree of the second throttling device to increase and controlling the current opening degree of the first throttling device to decrease; if it is determined that the current indoor environmental temperature of the indoor unit is less than or equal to the sum of the current pipe temperature of the first indoor heat exchanger and the preset indoor environmental temperature threshold and the current indoor environmental temperature of the indoor unit is greater than or equal to the current pipe temperature of the first indoor heat exchanger, then controlling the current opening degrees of both the second throttling device and the first throttling device to be maintained at the preset opening degree; if it is determined that the current indoor environmental temperature of the indoor unit is less than the current pipe temperature of the first indoor heat exchanger, then controlling the current opening degree of the second throttling device to decrease and controlling the current opening degree of the first throttling device to increase.

[0014] In some embodiments, it further includes: the control unit is further configured to, when the air conditioner operates in the heating mode after startup, control the current opening degree of the first throttling device to be the preset maximum opening degree and control the current opening degree of the second throttling device to be the preset opening degree to reduce the surface temperature of the first indoor heat exchanger; the acquisition unit is further configured to acquire the running duration of the air conditioner in the heating mode, denoted as the current running duration of the air conditioner in the heating mode; and acquire the pipe temperature of the outdoor heat exchanger, denoted as the current pipe temperature of the outdoor heat exchanger; the control unit is further configured to determine whether the air conditioner needs to enter the heating defrosting mode according to the current running duration of the air conditioner in the heating mode, the current pipe temperature of the outdoor heat exchanger, a first preset time threshold, a second preset time threshold, and a preset defrosting start temperature threshold; the control unit is further configured to, if it is determined that the air conditioner needs to enter the heating defrosting mode, control the air conditioner to switch from the heating mode to the heating defrosting mode, and when the air conditioner operates in the heating defrosting mode, adjust the current opening degrees of the first throttling device and the second throttling device so that the indoor fan of the air conditioner can be directly restarted and switched to the heating mode after the heating defrosting mode ends.

[0015] In some embodiments, the control unit determines whether the air conditioner needs to enter the heating defrost mode according to the current operation duration of the air conditioner in the heating mode, the current pipe temperature of the outdoor heat exchanger, a first preset time threshold, a second preset time threshold, and a preset defrost start temperature threshold, including: determining whether the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrost start temperature threshold, and determining whether the current operation duration of the air conditioner in the heating mode is less than the first preset time threshold; if it is determined that the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrost start temperature threshold and the current operation duration of the air conditioner in the heating mode is less than the first preset time threshold, then start timing to obtain the timing time, and determine whether the timing time is greater than the second preset time threshold: if so, determine that the air conditioner needs to enter the heating defrost mode, otherwise control the air conditioner to maintain the current state; if it is determined that the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrost start temperature threshold and the current operation duration of the air conditioner in the heating mode is greater than or equal to the first preset time threshold, then determine that the air conditioner needs to enter the heating defrost mode; if it is determined that the current pipe temperature of the outdoor heat exchanger is greater than the preset defrost start temperature threshold, then control the air conditioner to maintain the current state.

[0016] In some embodiments, the control unit controls the air conditioner to switch from the heating mode to the heating defrost mode, and when the air conditioner is operating in the heating defrost mode, adjusts the current opening degree of the first throttling device and the current opening degree of the second throttling device, including: controlling the indoor fan of the air conditioner to stop rotating, controlling the air conditioner to switch from the heating mode to the heating defrost mode, adjusting the current opening degree of the first throttling device to the preset opening degree, and adjusting the current opening degree of the second throttling device to the preset maximum opening degree, so as to store heat in the first indoor heat exchanger and store cold in the second indoor heat exchanger during the defrosting process of the outdoor heat exchanger; determining whether the current pipe temperature of the outdoor heat exchanger is greater than the preset defrost start temperature threshold; if it is determined that the current pipe temperature of the outdoor heat exchanger is greater than the preset defrost start temperature threshold, then after controlling the air conditioner to exit the heating defrost mode, control the indoor fan of the air conditioner to restart, and control the air conditioner to directly switch from the heating defrost mode to the heating mode; if it is determined that the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrost start temperature threshold, then control the air conditioner to maintain the current state.

[0017] Matched with the above device, on the other hand, the present invention provides an air conditioner, including: the control device of the air conditioner described above.

[0018] Matched with the above method, on the other hand, the present invention provides a storage medium, the storage medium includes a stored program, wherein, when the program runs, it controls the device where the storage medium is located to execute the control method of the air conditioner described above.

[0019] Thus, in the solution of the present invention, for an air conditioner composed of a compressor, a four-way valve, an outdoor heat exchanger, an outdoor throttling device (such as the second throttling device 22), and an original indoor heat exchanger (such as the second indoor heat exchanger 12), a first indoor heat exchanger 11 and a first throttling device 21 are arranged between the second throttling device 22 and the second indoor heat exchanger 12. When the air conditioner operates in the cooling mode, by adjusting the opening degrees of the first throttling device 21 and the second throttling device 22, when the second indoor heat exchanger 12 is responsible for cooling and dehumidifying, the first indoor heat exchanger 11 is responsible for reheating to reduce humidity, avoiding water-carrying in the air blown out from the air outlet of the air conditioner. Therefore, by arranging a new indoor heat exchanger and a new throttling device between the outdoor throttling device of the air conditioner and the original indoor heat exchanger, and adjusting the opening degrees of the original throttling device and the new throttling device when the air conditioner operates in the cooling mode, it is possible to avoid water floating at the air outlet of the air conditioner and improve the user experience.

[0020] Meanwhile, in the solution of the present invention, when the air conditioner operates in the cooling mode, by adjusting the opening degrees of the first throttling device 21 and the second throttling device 22, when the second indoor heat exchanger 12 is responsible for cooling and dehumidifying, the first indoor heat exchanger 11 can be responsible for slightly reheating to reduce humidity. Since the first indoor heat exchanger 11 can undertake part of the cooling task without causing the original heat exchanger in the air inlet direction of the indoor unit to freeze, it is possible to avoid having to turn off the compressor or reduce the throttling effect to defrost due to the freezing of the indoor unit, which affects the cooling efficiency of the air conditioner, and can improve the user experience.

[0021] In addition, in the solution of the present invention, when the air conditioner operates in the heating mode, by adjusting the opening degrees of the first throttling device 21 and the second throttling device 22, when the second indoor heat exchanger 12 is responsible for main heating, the first indoor heat exchanger 11 is responsible for assisting in heating, avoiding the surface temperature of the second indoor heat exchanger 12 being too high when the air conditioner operates in the heating mode, and preventing burns when a user or maintenance personnel accidentally touches the first indoor heat exchanger 11 or the second indoor heat exchanger 12, thus improving the user's safe use experience. Moreover, when the air conditioner operates in the defrosting mode, by adjusting the opening degrees of the first throttling device 21 and the second throttling device 22, when the outdoor heat exchanger defrosts and the second indoor heat exchanger 12 stores cold, the first indoor heat exchanger 11 stores heat, enabling full-power heating to start immediately after the defrosting ends without waiting for anti-cold air, improving the heating efficiency and enhancing the user experience.

[0022] Other features and advantages of the present invention will be described in the subsequent specification, and some will become obvious from the specification or be understood by implementing the present invention.

[0023] The technical solution of the present invention will be further described in detail below with reference to the drawings and embodiments. Description of the Drawings

[0024] Figure 1 Schematic flowchart of an embodiment of the control method of the air conditioner according to the present invention;

[0025] Figure 2 Schematic flowchart of an embodiment of adjusting the current opening degree of the first throttling device 21 and the current opening degree of the second throttling device 22 according to the current indoor environmental temperature of the indoor unit, the current pipe temperature of the first indoor heat exchanger 11, and a preset indoor environmental temperature threshold in the method of the present invention;

[0026] Figure 3 Schematic flowchart of an embodiment of controlling the current opening degree of the first throttling device 21 and the current opening degree of the second throttling device 22 during the heating operation of the air conditioner in the method of the present invention;

[0027] Figure 4 Schematic flowchart of an embodiment of determining whether the air conditioner needs to enter the heating defrosting mode according to the current operation duration of the air conditioner in the heating mode, the current pipe temperature of the outdoor heat exchanger, and a first preset time threshold, a second preset time threshold, and a preset defrosting start temperature threshold in the method of the present invention;

[0028] Figure 5 Schematic flowchart of an embodiment of controlling the air conditioner to switch from the heating mode to the heating defrosting mode and adjusting the current opening degree of the first throttling device 21 and the current opening degree of the second throttling device 22 when the air conditioner is operating in the heating defrosting mode in the method of the present invention;

[0029] Figure 6 Schematic structural diagram of an embodiment of the control device of the air conditioner according to the present invention;

[0030] Figure 7 Schematic structural diagram of an embodiment of an anti-condensation and high-efficiency air conditioner according to the present invention;

[0031] Figure 8 Schematic diagram of the refrigerant flow path of an embodiment of an anti-condensation and high-efficiency air conditioner according to the present invention in the cooling mode and the heating defrosting mode;

[0032] Figure 9 Schematic diagram of the refrigerant flow path of an embodiment of an anti-condensation and high-efficiency air conditioner according to the present invention in the heating mode;

[0033] Figure 10 Schematic flowchart of an embodiment of the control method of an anti-condensation and high-efficiency air conditioner according to the present invention in the cooling mode;

[0034] Figure 11 Schematic flowchart of an embodiment of the control method of an anti-condensation and high-efficiency air conditioner according to the present invention in the heating mode.

[0035] In combination with the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0036] 11 - First indoor heat exchanger; 12 - Second indoor heat exchanger; 21 - First throttling device; 22 - Second throttling device; 102 - Acquisition unit; 104 - Control unit. Specific embodiments

[0037] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in combination with specific embodiments of the present invention and the corresponding accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0038] Considering that in the related solutions, when the air conditioner operates in the cooling mode under high - humidity conditions, after the high - temperature and high - humidity air outside the air - conditioner air outlet mixes with the low - temperature and high - humidity air sent out by the air conditioner, there is a situation where water is likely to float out of the air - conditioner air outlet, seriously affecting the user experience. Therefore, the solution of the present invention proposes a control method for an air conditioner, specifically a control method for an anti - condensation and efficient air conditioner. By adding a throttling device and a small heat exchanger in the air - outlet direction of the indoor unit, when the air conditioner operates in the cooling mode, by adjusting the opening degree of the original throttling device of the outdoor unit and the opening degree of the newly added throttling device of the indoor unit, the original heat exchanger in the air - inlet direction of the indoor unit is responsible for cooling and dehumidifying, and the small heat exchanger is responsible for reheating and reducing the humidity of the air. Since the original heat exchanger will cool the air to a relatively low temperature, thereby reducing the moisture content, and then through the small heat exchanger, the air is reheated to reduce the humidity of the outlet air. At this time, when the low - temperature and low - humidity air sent out by the air - conditioner air outlet mixes with the surrounding high - temperature and high - humidity air, its temperature will not be lower than the dew - point temperature. Therefore, it is possible to prevent water from being carried out by the air at the air - conditioner air outlet during the cooling operation of the air conditioner, thus solving the problem that water is likely to float out of the air - conditioner air outlet and improving the user experience.

[0039] In addition, in related solutions, when the air conditioner operates in the cooling mode, to prevent the indoor unit from freezing, the air conditioner must turn off the compressor or reduce the throttling effect to defrost. However, turning off the compressor or reducing the throttling effect will affect the cooling efficiency and also the user experience. In the solution of the present invention, a throttling device and a small heat exchanger are added in the air outlet direction of the indoor unit. When the air conditioner operates in the cooling mode, by adjusting the opening degree of the original throttling device of the outdoor unit and the opening degree of the newly added throttling device of the indoor unit, the original heat exchanger in the air inlet direction of the indoor unit is responsible for cooling and dehumidifying, and the small heat exchanger is responsible for reheating and reducing humidity. When the original heat exchanger may freeze, by adjusting the opening degrees of the two throttling devices, the original heat exchanger is heated up and the small heat exchanger is cooled down. Since the small heat exchanger shares part of the cooling capacity, the original heat exchanger in the air inlet direction of the indoor unit will not freeze at a low temperature, thus avoiding the problem that the cooling efficiency of the air conditioner is affected because the compressor must be turned off or the throttling effect must be reduced to defrost due to the freezing of the indoor unit, and can solve the problem that the natural defrosting by turning off the compressor or reducing the throttling effect when the indoor unit freezes leads to a decrease in the cooling effect, and improve the user experience.

[0040] Moreover, when the air conditioner operates in the heating mode, since the surface temperature of the evaporator is too high, if a user or a maintenance personnel touches the evaporator, there is a safety hazard of being scalded, which also affects the user experience. In the solution of the present invention, a throttling device and a small heat exchanger are added in the air outlet direction of the indoor unit. On the one hand, it can prevent the user or the maintenance personnel from touching the original heat exchanger in the air inlet direction of the indoor unit outside the original heat exchanger in the air inlet direction of the indoor unit; on the other hand, when the air conditioner operates in the heating mode, by adjusting the opening degree of the original throttling device of the outdoor unit and the opening degree of the newly added throttling device of the indoor unit, the original heat exchanger in the air inlet direction of the indoor unit is responsible for the main heating, and the small heat exchanger is responsible for assisting in heating. The surface temperature of the small heat exchanger is relatively low, which can prevent the user or the maintenance personnel from being scalded when accidentally touching the small heat exchanger, thus solving the problem that it is easy to generate danger due to the too high surface temperature of the evaporator during the heating operation, and improving the user experience.

[0041] Furthermore, when the air conditioner finishes heating and defrosting, the refrigerant temperature in the indoor heat exchanger is extremely low, and the internal fan cannot be turned on immediately for heating and air supply. The compressor must be run for a period of time before the internal fan can be turned on for air supply. This invisibly prolongs the heating and defrosting cycle of the air conditioner, affects the heating efficiency, and also affects the user experience. In the scheme of the present invention, a throttling device and a small heat exchanger are added in the air outlet direction of the indoor unit, so that when the air conditioner is heating and defrosting, the outdoor heat exchanger is defrosted by adjusting the opening of the original throttling device of the outdoor unit to the maximum and adjusting the opening of the newly added throttling device of the indoor unit to an appropriate opening, so that the original heat exchanger in the air inlet direction of the indoor unit is responsible for acting as a temporary cold storage device, and the small heat exchanger is responsible for heat storage, so that full-power heating can be started immediately after defrosting is completed. At this time, the temperature of the original heat exchanger is not high and is responsible for preliminary auxiliary heating, and the temperature of the small heat exchanger is relatively high and is responsible for secondary main heating. There is no need to wait for cold wind protection, and the defrost scheme is optimized. As the defrosting is completed, the temperature of the original heat exchanger will continue to rise to the working temperature. At this time, the heat storage of the small heat exchanger is basically released, which can solve the problem that the indoor fan cannot be turned on immediately for heating and air supply after heating and defrosting, and the compressor must be run for a period of time before the indoor fan can be turned on for air supply, resulting in a long air conditioning heating and defrosting cycle. The user experience is improved.

[0042] According to an embodiment of the present invention, a method for controlling an air conditioner is provided. Figure 1 A flow chart of an embodiment of the method of the present invention is shown. The air conditioner comprises: an indoor unit and an outdoor unit. The indoor unit comprises: a first indoor heat exchanger 11, a first throttling device 21 and a second indoor heat exchanger 12. The outdoor unit comprises: a compressor, a four-way valve, an outdoor heat exchanger and a second throttling device 22. The exhaust port of the compressor is connected to the fourth valve port of the four-way valve after passing through the first valve port and the second valve port of the four-way valve, and then through the outdoor heat exchanger, the second throttling device 22, the first indoor heat exchanger 11, the first throttling device 21 and the second indoor heat exchanger 12. The third valve port of the four-way valve returns to the air intake port of the compressor.

[0043] Specifically, Figure 7 The schematic diagram of the structure of an embodiment of an anti-condensation high-efficiency air conditioner of the present invention. The scheme of the present invention uses an indoor heat exchanger system composed of a first indoor heat exchanger 11 and a second indoor heat exchanger 12 respectively located before and after the indoor unit fan, and a first throttling device 21 located between the first indoor heat exchanger 11 and the second indoor heat exchanger 12, wherein the first indoor heat exchanger 11 is much smaller than the second indoor heat exchanger 12, and the structure plays a role in isolating the air outlet from the second indoor heat exchanger 12. Figure 7The anti-condensation high-efficiency air conditioner shown includes: a compressor, a four-way valve, an outdoor heat exchanger, an outdoor unit fan, and a second throttling device 22 arranged on the outdoor side. The outdoor heat exchanger is arranged on the air inlet side of the outdoor unit fan. As Figure 7 The anti-condensation high-efficiency air conditioner shown further includes: a first indoor heat exchanger 11, a second indoor heat exchanger 12, an indoor unit fan, and a first throttling device arranged on the indoor side. The indoor unit fan is arranged between the second indoor heat exchanger 12 and the first indoor heat exchanger 11. Among them, the exhaust port of the compressor is communicated with the first valve port of the four-way valve. The first valve port of the four-way valve is communicated with the fourth valve port of the compressor after passing through the outdoor heat exchanger, the second throttling device 22, the first indoor heat exchanger 11, the first throttling device 21, and the second indoor heat exchanger 12. The third valve port of the compressor is communicated with the suction port of the compressor. Among them, the first throttling device 21 and the second throttling device 22 are preferably electronic expansion valves or other devices with adjustable opening degrees, so as to accurately control the pipe temperature of the first indoor heat exchanger 11. The first indoor heat exchanger 11 can be only made of copper pipes or other simple heat exchange structures.

[0044] Generally speaking, the scale of the first indoor heat exchanger 11 does not need to be too large. Its main function is to recover heat and reduce humidity during refrigeration, and store heat during heating. According to the design scheme of a similar large-scale industrial constant temperature and humidity air conditioning system, its heat exchange performance only needs to be less than 1 / 4 of the original evaporator to meet the requirements. In terms of structure, since this first indoor heat exchanger 11 is only used for heating air, there is no need to design other special structures such as a water receiving tray. When the first indoor heat exchanger 11 needs to replace the grille, it is necessary to additionally ensure that there are no sharp edges and other structures. When the first indoor heat exchanger 11 does not replace the grille, it can be a conventional finned heat exchanger, a tubular heat exchanger, etc.

[0045] Preferably, the second indoor heat exchanger 12 is installed in the air inlet direction of the indoor unit fan of the air conditioner. The first indoor heat exchanger 11 is installed in the air outlet direction of the indoor unit fan of the air conditioner. Among them, the first indoor heat exchanger 11 should be installed as close to the air outlet as possible, and the second indoor heat exchanger 12 should be installed as close to the air inlet as possible. See Figure 7In the example shown, the second indoor heat exchanger 12 is located on the air inlet side of the indoor unit fan, and the first indoor heat exchanger 11 is located on the air outlet side of the indoor unit fan. Of course, on the indoor side, the first indoor heat exchanger 11 can also be installed on the air inlet side of the indoor unit fan. However, in this case, it will be inevitable that users or maintenance personnel accidentally touch the working indoor unit fan. Therefore, in this case, an anti-collision device needs to be additionally installed on the air outlet side of the indoor fan. In addition, in some cases, if the first indoor heat exchanger 11 is made in the form of a grille, the grille of the indoor unit can be directly replaced with the first indoor heat exchanger 11, which can relatively save the grille separately provided in the indoor unit. However, it should be ensured that there are no sharp edges or other structures that may harm users and that users cannot pass through the first indoor heat exchanger 11 to touch other structures.

[0046] As Figure 1 shown, the control method of the air conditioner includes: the process of controlling the current opening degree of the first throttling device 21 and the current opening degree of the second throttling device 22 during the refrigeration operation of the air conditioner, specifically including: step S110 to step S130.

[0047] At step S110, when the air conditioner starts and operates in the refrigeration mode, control the current opening degree of the first throttling device 21 and the current opening degree of the second throttling device 22 to be preset opening degrees, so that the first indoor heat exchanger 11 warms up to reduce humidity, and the second indoor heat exchanger 12 performs refrigeration and dehumidification. Specifically, after the refrigerant at normal temperature and pressure after the first throttling of the second throttling device 22 enters the indoor unit, it first enters the first indoor heat exchanger 11 to warm up and reduce the humidity of the air at the air outlet of the indoor unit, and then undergoes secondary throttling through the first throttling device to become a refrigerant at low temperature and low pressure, and then enters the second indoor heat exchanger 12 to warm up and dehumidify the air at the air inlet of the indoor unit. Among them, the current opening degree of the first throttling device 21 is opening degree D1, and the current opening degree of the second throttling device 22 is opening degree D2.

[0048] At step S120, during the refrigeration operation of the air conditioner, obtain the ambient temperature of the indoor unit, denoted as the current indoor ambient temperature of the indoor unit, such as the ambient temperature T1 on the indoor side. And obtain the pipe temperature of the first indoor heat exchanger 11, denoted as the current pipe temperature of the first indoor heat exchanger 11, such as the pipe temperature T3 of the first indoor heat exchanger 11.

[0049] At step S130, according to the current indoor ambient temperature of the indoor unit, the current pipe temperature of the first indoor heat exchanger 11, and a preset indoor ambient temperature threshold, the current opening degrees of the first throttling device 21 and the second throttling device 22 are adjusted, so as to control the refrigeration and dehumidification degree of the second indoor heat exchanger 12 by adjusting the refrigerant temperature in the first indoor heat exchanger 11, which is beneficial to reducing the supply air humidity at the air outlet of the indoor unit, avoiding water carried by the supply air at the air outlet of the indoor unit, and improving the user experience.

[0050] Specifically, Figure 8 FIG. is a schematic diagram of a refrigerant flow path of an embodiment of an anti-condensation and high-efficiency air conditioner of the present invention in a refrigeration mode and a heating defrosting mode. As Figure 8 shown, when the air conditioner and its control system are powered on and running, the high-temperature and high-pressure refrigerant discharged from the compressor enters the outdoor heat exchanger through the four-way valve to release heat and cool down, and the low-temperature and high-humidity supply air passing through the second indoor heat exchanger 12 absorbs heat and raises the temperature and reduces the humidity in the first indoor heat exchanger 11, and the low-temperature and low-pressure refrigerant returns to the compressor through the four-way valve. Among them, by adjusting the opening degree of the second throttling device 22, it is ensured that the refrigerant temperature flowing into the first indoor heat exchanger 11 is slightly lower than the target ambient temperature. By adjusting the opening degree of the first throttling device 21, it is ensured that the refrigeration effect of the second indoor heat exchanger 12 reaches the best level. Among them, the target ambient temperature is the required air outlet temperature, and its magnitude is equal to T1 - T2. The refrigerant temperature in the first indoor heat exchanger 11 being slightly lower than the target ambient temperature means that the refrigerant temperature in the first indoor heat exchanger 11 is only lower than the magnitude of T2, and T2 itself is a relatively small value.

[0051] Specifically, as Figure 8 shown, when the air conditioner is operating in the refrigeration mode, the high-temperature and high-pressure refrigerant discharged from the exhaust port of the compressor passes through the four-way valve, first releases heat through the outdoor heat exchanger, becomes a relatively high-temperature and high-pressure refrigerant, and then becomes a normal-temperature and normal-pressure refrigerant after being preliminarily throttled by the second throttling device 22. In order to avoid heat exchange when passing through the indoor and outdoor unit connection pipelines, the normal-temperature and normal-pressure refrigerant first enters the first indoor heat exchanger 11 after entering the indoor side, raises the temperature and reduces the humidity of the supply air on the supply air side of the indoor unit fan, prevents the mixed air temperature of the supply air on the supply air side of the indoor unit fan and the indoor air from being lower than the dew point and generating water-carrying at the air outlet, and then passes through the first throttling device 21 for secondary throttling, becomes a low-temperature and low-pressure refrigerant, enters the second indoor heat exchanger 12 for heat absorption and dehumidification, and finally returns to the compressor through the suction port of the compressor to repeat this cycle. Since the supply air on the supply air side of the indoor unit fan is heated and the humidity is reduced through the first indoor heat exchanger 11, it is possible to prevent water from being carried by the air outlet of the indoor unit during the refrigeration operation of the air conditioner, thereby solving the problem of water floating easily at the air outlet of the air conditioner and improving the user experience.

[0052] A control method for an anti-condensation high-efficiency air conditioner proposed by the solution of the present invention is to add a throttling device (such as the first throttling device 21) and a small heat exchanger (such as the first indoor heat exchanger 11) between the original heat exchanger (such as the second indoor heat exchanger 12) of the indoor unit and the original throttling device (such as the second throttling device 22) of the outdoor unit, and the small heat exchanger (such as the first indoor heat exchanger 11) is located in the air outlet direction of the indoor unit. Specifically, a small heat exchanger (i.e., the first indoor heat exchanger 11) is additionally added at the air supply outlet of the indoor unit for auxiliary refrigeration or auxiliary heating, and a throttling device (i.e., the first throttling device 21) is added between the original heat exchanger (i.e., the second indoor heat exchanger 12) of the indoor unit and the first indoor heat exchanger 11. During the refrigeration operation of the air conditioner, by combining the corresponding parameters of the indoor environmental temperature of the air conditioner (such as the environmental temperature T1), the pipe temperature of the small heat exchanger (such as the first indoor heat exchanger 11) (such as the temperature T3), the operating time of the air conditioner (such as the time t1), and the pipe temperature of the outdoor heat exchanger (such as the temperature T4), the opening degrees of the newly added throttling device (such as the first throttling device 21) and the original throttling device (such as the second throttling device 22) of the outdoor unit are adjusted to realize the adjustment of the refrigerant temperature at the inlet of the small heat exchanger (such as the first indoor heat exchanger 11) and the refrigerant temperature at the inlet of the original heat exchanger (such as the second indoor heat exchanger 12), so as to realize the adjustment of the corresponding parameters of the air outlet temperature of the air conditioner, the surface temperature of the original heat exchanger (such as the second indoor heat exchanger 12) of the indoor unit, and the pipe temperature of the outdoor heat exchanger (such as the temperature T4), so as to at least solve the problem that water is likely to float at the air outlet of the air conditioner and improve the user experience. At the same time, the solution of the present invention also solves the problem that when the indoor unit freezes, the compressor needs to be turned off or the throttling effect needs to be reduced to defrost naturally, resulting in a decrease in the refrigeration effect, and improves the user experience.

[0053] In some embodiments, for the specific process of adjusting the current opening degree of the first throttling device 21 and the current opening degree of the second throttling device 22 according to the current indoor environmental temperature of the indoor unit, the current pipe temperature of the first indoor heat exchanger 11, and the preset indoor environmental temperature threshold in step S130, refer to the following exemplary description.

[0054] The following combination Figure 2Schematic diagram of a flow of an embodiment of the method of the present invention for adjusting the current opening degree of the first throttling device 21 and the current opening degree of the second throttling device 22 according to the current indoor environmental temperature of the indoor unit, the current pipe temperature of the first indoor heat exchanger 11, and a preset indoor environmental temperature threshold, further illustrating the specific process of adjusting the current opening degree of the first throttling device 21 and the current opening degree of the second throttling device 22 according to the current indoor environmental temperature of the indoor unit, the current pipe temperature of the first indoor heat exchanger 11, and a preset indoor environmental temperature threshold in step S130, including: steps S210 to S240.

[0055] Step S210, determine whether the current indoor environmental temperature of the indoor unit is greater than the sum of the current pipe temperature of the first indoor heat exchanger 11 and the preset indoor environmental temperature threshold, and determine whether the current indoor environmental temperature of the indoor unit is less than the current pipe temperature of the first indoor heat exchanger 11.

[0056] Step S220, if it is determined that the current indoor environmental temperature of the indoor unit is greater than the sum of the current pipe temperature of the first indoor heat exchanger 11 and the preset indoor environmental temperature threshold, then control the current opening degree of the second throttling device 22 to increase, and control the current opening degree of the first throttling device 21 to decrease.

[0057] Step S230, if it is determined that the current indoor environmental temperature of the indoor unit is less than or equal to the sum of the current pipe temperature of the first indoor heat exchanger 11 and the preset indoor environmental temperature threshold, and the current indoor environmental temperature of the indoor unit is greater than or equal to the current pipe temperature of the first indoor heat exchanger 11, then control the current opening degrees of both the second throttling device 22 and the first throttling device 21 to be maintained at the preset opening degree.

[0058] Step S240, if it is determined that the current indoor environmental temperature of the indoor unit is less than the current pipe temperature of the first indoor heat exchanger 11, then control the current opening degree of the second throttling device 22 to decrease, and control the current opening degree of the first throttling device 21 to increase.

[0059] Specifically, Figure 10 Schematic diagram of a flow of an embodiment of the control method in the cooling mode of an anti-condensation and highly efficient air conditioner of the present invention. In the solution of the present invention, when the air conditioner operates in the cooling mode, the second indoor heat exchanger 12 located on the air inlet side of the indoor unit fan can effectively reduce the return air temperature below the dew point to achieve the dehumidification function. The dehumidified low-temperature and high-humidity return air then enters the first indoor heat exchanger 11 to absorb heat and warm up, ensuring that the air outlet temperature of the air conditioner will not be too low, and at the same time reducing the air outlet humidity to avoid serious situations that affect the user experience such as water spraying at the air outlet. As Figure 10 shown, the control method in the cooling mode of the anti-condensation and highly efficient air conditioner includes:

[0060] Step S11: When the operating mode of the air conditioner is switched to the cooling mode, start the cooling mode of the air conditioner. The control system of the air conditioner adjusts the opening degrees D1 of the first throttling device 21 and D2 of the second throttling device 22 to the preset opening degrees, and then execute Step S12. Among them, the preset opening degrees need to be determined in advance through experiments. The determination method can be: at the corresponding outer ring temperature, the second indoor heat exchanger 12 is in a state close to freezing (that is, the lowest tube temperature is 2-5°C), and the overall cooling effect reaches the best level. At this time, the temperature difference between the outlet air temperature and the tube of the first indoor heat exchanger 11 is T2.

[0061] Step S12: The control system of the air conditioner obtains the indoor environment temperature of the air conditioner detected by the indoor environment temperature sensor (such as the environmental temperature T1 on the indoor side), obtains the preset deviation parameter T2 preset in the controller of the air conditioner, and then execute Step S12, and obtains the tube temperature T3 of the first indoor heat exchanger 11 detected by the temperature sensor of the first indoor heat exchanger 11, and then execute Step S13.

[0062] Step S13: Compare the magnitudes of the environmental temperature T1 on the indoor side, the tube temperature T3 of the first indoor heat exchanger 11 and the preset deviation parameter T2, and correspondingly execute the corresponding steps in Step S14, Step S15 and Step S16 according to the comparison result.

[0063] Step S14: If T1>T2+T3, control the opening degree D2 of the second throttling device 22 to increase, and control the opening degree D1 of the first throttling device 21 to decrease, and then return to Step S13 to perform cyclic comparison without switching the operating mode or shutting down. Among them, T1>T2+T3 means that the tube temperature of the first indoor heat exchanger 11 is too low, and it also means that the heat regeneration is insufficient at this time, so condensation is likely to occur. It is necessary to increase the opening degree D2 of the second throttling device 22 to increase the tube temperature. If the tube temperature of the second indoor heat exchanger 12 is too high after increasing the opening degree D2 of the second throttling device 22, the cooling effect is not good, and it is necessary to decrease the opening degree D1 of the first throttling device 21 to ensure the cooling effect.

[0064] Step S15: If T1<T3, control the opening degree D1 of the first throttling device 21 to increase, and control the opening degree D2 of the second throttling device 22 to decrease, and then return to Step S13 to perform cyclic comparison without switching the operating mode or shutting down. Among them, T1<T3 means that the tube temperature of the first indoor heat exchanger 11 is too high and the overall cooling effect is insufficient. It is necessary to decrease the opening degree D2 of the second throttling device 22 to reduce the tube temperature. If the tube temperature of the second indoor heat exchanger 12 is too low after decreasing the opening degree D2 of the second throttling device 22, it is easy to freeze, and it is necessary to increase the opening degree D1 of the first throttling device 21 to avoid freezing of the indoor unit.

[0065] Step S16: If T3 ≤ T1 ≤ T2 + T3, control the opening degree D1 of the first throttling device 21 and the opening degree D2 of the second throttling device 22 to both maintain at the preset opening degree, and then return to step S13 to perform cyclic comparison without switching the operating mode or shutting down.

[0066] As Figure 8 and Figure 10 shown, when the second indoor heat exchanger 12 freezes during the air conditioner's cooling operation, the air conditioner's control system automatically increases the throttling effect of the second throttling device 22 and reduces the throttling effect of the first throttling device 21, reducing the refrigerant temperature in the first indoor heat exchanger 11 and increasing the refrigerant temperature in the second indoor heat exchanger 12, so as to thaw the second indoor heat exchanger 12 while maintaining the cooling effect without having to shut down the compressor or reduce the throttling effect to thaw due to the freezing of the indoor unit, which affects the cooling efficiency of the air conditioner. This can solve the problem that when the indoor unit freezes, it is necessary to shut down the compressor or reduce the throttling effect for natural defrosting, resulting in a decrease in the cooling effect, and improve the user experience.

[0067] In some embodiments, the control method of the air conditioner according to the solution of the present invention further includes: the process of controlling the current opening degree of the first throttling device 21 and the current opening degree of the second throttling device 22 during the air conditioner's heating operation.

[0068] The following combines Figure 3 a schematic flowchart of an embodiment of controlling the current opening degree of the first throttling device 21 and the current opening degree of the second throttling device 22 during the air conditioner's heating operation in the method of the present invention shown, and further illustrates the specific process of controlling the current opening degree of the first throttling device 21 and the current opening degree of the second throttling device 22 during the air conditioner's heating operation, including: step S310 to step S340.

[0069] Step S310, when the air conditioner starts and operates in the heating mode, control the current opening degree of the first throttling device 21 to the preset maximum opening degree, and control the current opening degree of the second throttling device 22 to the preset opening degree, so that the relatively high-temperature and high-pressure refrigerant after passing through the second indoor heat exchanger first passes through the first throttling device 21 and then passes through the first indoor heat exchanger 11 for heat release, so as to reduce the surface temperature of the first indoor heat exchanger 11, and at this time, the surface temperature of the second indoor heat exchanger will not be too high, avoiding the risk of high-temperature scalding caused by accidentally touching the evaporator (i.e., the first indoor heat exchanger 11 and the second indoor heat exchanger). Wherein, the current opening degree of the first throttling device 21 is the opening degree D1, and the current opening degree of the second throttling device 22 is the opening degree D2.

[0070] Specifically, Figure 9 is a schematic diagram of the refrigerant flow path of an embodiment of an anti-condensation and high-efficiency air conditioner of the present invention in the heating mode. AsFigure 9 As shown, when the air conditioner and its control system are powered on and running, the high-temperature and high-pressure refrigerant discharged from the compressor enters the second indoor heat exchanger 12 through the four-way valve to release heat and cool down. The first throttling device 21 is fully opened so that the first indoor heat exchanger 11 can also perform heating. At this time, since the refrigerant has already undergone complete heat release in the second indoor heat exchanger 12, the surface temperature of the first indoor heat exchanger 11 will not be too high. Adjust the opening degree of the second throttling device 22 to ensure that the heating effect of the second indoor heat exchanger 12 reaches the best level. Then, the low-temperature and low-pressure refrigerant returns to the compressor through the four-way valve.

[0071] As Figure 9 As shown, when the air conditioner is in heating operation, the high-temperature and high-pressure refrigerant discharged from the exhaust port of the compressor is redirected (i.e., reversed) by the four-way valve and first passes through the second indoor heat exchanger 12 to release heat and becomes a relatively high-temperature and high-pressure refrigerant. The first throttling device 21 is fully opened, and these refrigerants then enter the first indoor heat exchanger 11 to release heat. At this time, the surface temperature of the first indoor heat exchanger 11 has dropped to a low enough temperature to avoid the risk of high-temperature burns caused by accidentally touching the first indoor heat exchanger 11. Then, it passes through the second throttling device 22 and the outdoor heat exchanger in sequence and returns to the suction port of the compressor to repeat this cycle, thus solving the problem that the surface temperature of the evaporator is too high and prone to danger during heating operation and improving the user experience.

[0072] Step S320: During the heating operation of the air conditioner, obtain the running duration of the air conditioner in the heating mode, denoted as the current running duration of the air conditioner in the heating mode, such as the running duration t1. And obtain the pipe temperature of the outdoor heat exchanger, denoted as the current pipe temperature of the outdoor heat exchanger, such as the pipe temperature T4 of the outdoor heat exchanger.

[0073] Step S330: According to the current running duration of the air conditioner in the heating mode, the current pipe temperature of the outdoor heat exchanger, as well as the first preset time threshold, the second preset time threshold, and the preset defrosting start temperature threshold, determine whether the air conditioner needs to enter the heating defrosting mode. The first preset time threshold is such as the preset time parameter t2, the second preset time threshold is such as the preset time parameter t3, and the preset defrosting start temperature threshold is such as the temperature 0°C.

[0074] In some embodiments, the specific process of determining whether the air conditioner needs to enter the heating defrosting mode in step S330 according to the current running duration of the air conditioner in the heating mode, the current pipe temperature of the outdoor heat exchanger, as well as the first preset time threshold, the second preset time threshold, and the preset defrosting start temperature threshold is shown in the following exemplary description.

[0075] The following combines Figure 4A schematic flowchart of an embodiment for determining whether the air conditioner needs to enter the heating defrosting mode according to the current operating duration of the air conditioner in the heating mode, the current pipe temperature of the outdoor heat exchanger, a first preset time threshold, a second preset time threshold, and a preset defrosting start temperature threshold in the method of the present invention. It further illustrates the specific process of determining whether the air conditioner needs to enter the heating defrosting mode in step S330 according to the current operating duration of the air conditioner in the heating mode, the current pipe temperature of the outdoor heat exchanger, a first preset time threshold, a second preset time threshold, and a preset defrosting start temperature threshold, including: step S410 to step S440.

[0076] Step S410, determine whether the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrosting start temperature threshold, and determine whether the current operating duration of the air conditioner in the heating mode is less than the first preset time threshold.

[0077] Step S420, if it is determined that the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrosting start temperature threshold and the current operating duration of the air conditioner in the heating mode is less than the first preset time threshold, then start timing to obtain the timing time, and determine whether the timing time is greater than the second preset time threshold: if so, determine that the air conditioner needs to enter the heating defrosting mode; otherwise, control the air conditioner to maintain the current state and then return to re-determine whether the timing time is greater than the second preset time threshold.

[0078] Step S430, if it is determined that the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrosting start temperature threshold and the current operating duration of the air conditioner in the heating mode is greater than or equal to the first preset time threshold, then determine that the air conditioner needs to enter the heating defrosting mode.

[0079] Step S440, if it is determined that the current pipe temperature of the outdoor heat exchanger is greater than the preset defrosting start temperature threshold, then control the air conditioner to maintain the current state and then return to re-determine whether the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrosting start temperature threshold, and determine whether the current operating duration of the air conditioner in the heating mode is less than the first preset time threshold.

[0080] Specifically, Figure 11 A schematic flowchart of an embodiment of the control method in the heating mode of an anti-condensation and high-efficiency air conditioner of the present invention. In the solution of the present invention, when the air conditioner is operating in heating, the high-temperature refrigerant first releases heat and cools down to a suitable temperature in the indoor heat exchanger, and then enters the first indoor heat exchanger 11 to further release heat. Since the first indoor heat exchanger 11 is blocked at the air outlet, it can effectively prevent users from accidentally touching the fan blades or the second indoor heat exchanger 12 operating at a high temperature. As Figure 11 shown, the control method in the heating mode of the anti-condensation and high-efficiency air conditioner includes:

[0081] Step S21: After the operation mode of the air conditioner is switched to the heating mode, start the heating mode of the air conditioner. The opening degree D1 of the first throttling device 21 will be adjusted to the maximum value, and the opening degree D2 of the second throttling device 22 will be adjusted to a preset opening degree until the operation mode is switched, the air conditioner is turned off, or the heating defrosting mode is entered, and then step S22 is executed.

[0082] Step S22: Time the operation time of the air conditioner in the heating mode to obtain the operation duration t1 of the air conditioner in the heating mode. Obtain the pipe temperature T4 of the outdoor heat exchanger detected by the temperature sensor of the outdoor heat exchanger of the air conditioner, and obtain the preset time parameter t2 and the preset time parameter t3 preset in the controller of the air conditioner, and then execute step S23.

[0083] Among them, the preset time parameter t2 is used to limit the maximum heating duration. The purpose of its setting is to avoid the problem that when the external pipe temperature fluctuates, the external unit will frost too much due to not entering the defrosting for a long time, and the heating performance will be significantly attenuated. The preset time parameter t3 is used to limit the minimum heating duration. The purpose of its setting is to avoid the problem of frequent defrosting when the external ring temperature is too low and the external pipe temperature drops below 0°C in advance.

[0084] Step S23: Compare the pipe temperature T4 of the outdoor heat exchanger with 0°C, and compare the operation duration t1 of the air conditioner in the heating mode with the preset time parameter t2, and correspondingly execute the corresponding steps in step S24, step S25, and step S26 according to the comparison results.

[0085] Step S24: If T4 ≤ 0°C and t1 ≤ t2, start timing and obtain the timing time t4, and then execute step S27.

[0086] Step S25: If T4 ≤ 0°C and t1 ≥ t2, execute step S32.

[0087] Step S26: If T4 > 0°C, control the air conditioner to remain unchanged, and then return to step S23 to perform cyclic comparison without switching the operation mode, turning off the air conditioner, or entering the heating defrosting mode.

[0088] Step S27: Compare the timing time t4 with the preset time parameter t3: If t4 > t3, enter the heating defrosting mode and execute step S32. If t4 ≤ t3, remain unchanged, and then return to step S23 to perform cyclic comparison without switching the operation mode, turning off the air conditioner, or entering the heating defrosting mode.

[0089] As Figure 8As shown, during the heating operation of the air conditioner, when the control system of the air conditioner monitors that the pipe temperature of the outdoor heat exchanger is continuously lower than 0°C for t3 time or the pipe temperature T4 of the outdoor heat exchanger is lower than 0°C after t2 time, it enters the heating defrosting mode. In the heating defrosting mode, the high-temperature and high-pressure refrigerant discharged by the compressor enters the outdoor heat exchanger through the four-way valve to release heat and cool down, realizing defrosting. The second throttling device 22 is fully opened to ensure that the temperature of the refrigerant flowing into the first indoor heat exchanger 11 does not decrease, realizing heat storage. The opening degree of the first throttling device 21 is adjusted to ensure the fastest defrosting speed, and then the low-temperature and low-pressure refrigerant returns to the compressor through the four-way valve. When the control system of the air conditioner monitors that the pipe temperature T4 of the outdoor heat exchanger is higher than 10°C, it enters the heating mode. In the heating mode, the four-way valve changes direction, the indoor unit fan is restarted, and it operates normally according to the heating mode. For details, please refer to Figure 9 the example shown and its related description.

[0090] Step S340, if it is determined that the air conditioner needs to enter the heating defrosting mode, then control the air conditioner to switch from the heating mode to the heating defrosting mode, and when the air conditioner is operating in the heating defrosting mode, adjust the current opening degree of the first throttling device 21 and the current opening degree of the second throttling device 22, so that the air conditioner can directly restart the indoor unit fan of the air conditioner and switch to the heating mode after the heating defrosting mode ends.

[0091] In the solution of the present invention, by adding a throttling device (such as the first throttling device 21) and a small heat exchanger (such as the first indoor heat exchanger 11) between the original heat exchanger (such as the second indoor heat exchanger 12) of the indoor unit and the original throttling device (such as the second throttling device 22) of the outdoor unit, the small heat exchanger (such as the first indoor heat exchanger 11) is located in the air outlet direction of the indoor unit. Specifically, an additional small heat exchanger (i.e., the first indoor heat exchanger 11) is added at the air supply outlet of the indoor unit for auxiliary refrigeration or auxiliary heating, and a throttling device (i.e., the first throttling device 21) is added between the original heat exchanger (i.e., the second indoor heat exchanger 12) of the indoor unit and the first indoor heat exchanger 11. During the heating operation or heating defrosting operation of the air conditioner, by combining the corresponding parameters of the indoor environmental temperature (such as the environmental temperature T1), the pipe temperature of the small heat exchanger (such as the temperature T3 of the first indoor heat exchanger 11), the operating time of the air conditioner (such as the time t1), and the pipe temperature of the outdoor heat exchanger (such as the temperature T4), the opening degrees of the newly added throttling device (such as the first throttling device 21) and the original throttling device (such as the second throttling device 22) of the outdoor unit are adjusted, solving the problem that the surface temperature of the evaporator is too high and prone to danger during the heating operation, and improving the user experience. And, it solves the problem that after heating defrosting, the indoor fan cannot be immediately turned on for heating air supply, and the compressor must be operated for a period of time before the indoor fan can be turned on for air supply, resulting in too long a cycle of heating defrosting of the air conditioner, and improving the user experience.

[0092] In some embodiments, in step S340, the air conditioner is controlled to switch from the heating mode to the heating defrosting mode, and when the air conditioner operates in the heating defrosting mode, the specific process of adjusting the current opening degree of the first throttling device 21 and the current opening degree of the second throttling device 22 is as follows in the following exemplary description.

[0093] The following combines Figure 5 A schematic flowchart of an embodiment of the method of the present invention for controlling the air conditioner to switch from the heating mode to the heating defrosting mode and, when the air conditioner operates in the heating defrosting mode, adjusting the current opening degree of the first throttling device 21 and the current opening degree of the second throttling device 22 is shown below, and further illustrates the specific process of controlling the air conditioner to switch from the heating mode to the heating defrosting mode in step S340 and, when the air conditioner operates in the heating defrosting mode, adjusting the current opening degree of the first throttling device 21 and the current opening degree of the second throttling device 22, including: step S510 to step S540.

[0094] Step S510, control the indoor unit fan of the air conditioner to stop rotating, control the air conditioner to switch from the heating mode to the heating defrosting mode, adjust the current opening degree of the first throttling device 21 to the preset opening degree, and adjust the current opening degree of the second throttling device 22 to the preset maximum opening degree, so that during the defrosting process of the outdoor heat exchanger, the first indoor heat exchanger 11 stores heat and the second indoor heat exchanger 12 stores cold. Specifically, the high-temperature and high-pressure refrigerant discharged by the compressor first enters the outdoor heat exchanger for defrosting after passing through the four-way valve, and then the relatively high-temperature and high-pressure refrigerant output by the second throttling device 22 enters the first indoor heat exchanger 11 to store heat, and after passing through the first throttling device 21, it becomes a low-temperature and low-pressure refrigerant and then enters the second indoor heat exchanger 12 to store cold. In this way, full-power heating can start immediately after defrosting ends without waiting for cold air prevention, realizing the optimization of the defrosting scheme.

[0095] Step S520, determine whether the current pipe temperature of the outdoor heat exchanger is greater than the preset defrosting start temperature threshold. The preset defrosting start temperature threshold is, for example, 10°C.

[0096] Step S530, if it is determined that the current pipe temperature of the outdoor heat exchanger is greater than the preset defrosting start temperature threshold, then after controlling the air conditioner to exit the heating defrosting mode, control the indoor unit fan of the air conditioner to restart, and control the air conditioner to directly switch from the heating defrosting mode to the heating mode.

[0097] Step S540: If it is determined that the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrost start temperature threshold, control the air conditioner to maintain the current state, and then return to re-determine whether the current pipe temperature of the outdoor heat exchanger is greater than the preset defrost start temperature threshold.

[0098] Specifically, as Figure 11 shown, the control method in the heating mode of the anti-condensation high-efficiency air conditioner further includes: Step S31, start the air conditioner to the heating defrost mode, and then execute Step S32.

[0099] Step S32: Control the indoor fan of the air conditioner to stop rotating, control the four-way valve of the air conditioner to change direction, adjust the opening D1 of the first throttling device 21 to the preset opening, and adjust the opening D2 of the second throttling device 22 to the maximum opening, and then execute Step S33.

[0100] Step S33: Compare the pipe temperature T4 of the outdoor heat exchanger with 10°C, and correspondingly execute the corresponding steps in Step S34 and Step S35 according to the comparison result.

[0101] Step S34: If T4 > 10°C, exit the heating defrost mode, and then execute Step 36.

[0102] Step S35: If T4 ≤ 10°C, maintain the original state, and then return to Step 33.

[0103] Step S36: Control the indoor fan of the air conditioner to restart, control the four-way valve of the air conditioner to change direction, adjust the opening D1 of the first throttling device 21 to the maximum opening, adjust the opening D2 of the second throttling device 22 to the preset opening, and then return to Step 21.

[0104] In Step S32, when entering the heating defrost mode, the system stops the indoor fan, the four-way valve changes direction, the opening D1 of the first throttling device 21 is adjusted to the preset opening, and the opening D2 of the second throttling device 22 is adjusted to the maximum value until the defrost ends, and immediately restarts the indoor fan, and controls the four-way valve to change direction and the openings of the first throttling device 21 and the second throttling device 22 according to the control logic related to the heating mode. In Step 36, when the heating defrost operation of the air conditioner ends, the control system of the air conditioner can directly turn on the indoor fan without waiting for the compressor to run for a period of time to replace the low-temperature refrigerant in the indoor heat exchanger, effectively reducing the defrost cycle, thereby improving the heating efficiency.

[0105] As Figure 8As shown in the figure, when the air conditioner is in the heating defrosting operation, the indoor fan is stopped. The high-temperature and high-pressure refrigerant coming out of the exhaust port of the compressor is redirected (i.e., reversed) through the four-way valve and first enters the outdoor heat exchanger to defrost the outdoor heat exchanger. The second throttling device 22 is fully opened. The relatively high-temperature and high-pressure refrigerant enters the first indoor heat exchanger 11 to store heat. After passing through the first throttling device 21, it becomes a low-temperature and low-pressure refrigerant and then enters the second indoor heat exchanger 12 to store cold. Finally, it returns to the suction port of the compressor to repeat this cycle until the defrosting is completed. At this time, the indoor fan is restarted to perform the heating operation. In this way, full-power heating can be started immediately after the defrosting is completed without waiting for the anti-cold wind, realizing the optimization of the defrosting scheme, and solving the problem that after the heating defrosting, the indoor fan cannot be immediately started to supply hot air, and the compressor must be operated for a period of time before the indoor fan can be started to supply air, resulting in an overly long cycle of the air conditioner's heating defrosting, and improving the user experience.

[0106] The solution of the present invention is applicable to floor-standing air conditioners or wall-mounted air conditioners and can prevent water from being carried by the indoor air outlet. Specifically, for a dual indoor heat exchanger, one indoor heat exchanger (such as the second indoor heat exchanger 12) arranged in the air inlet direction of the indoor unit is responsible for cooling and dehumidifying, and one indoor heat exchanger (such as the first indoor heat exchanger 11) arranged in the air outlet direction of the indoor unit is responsible for reheating and reducing humidity. Moreover, when one indoor heat exchanger (such as the first indoor heat exchanger 11) arranged in the air outlet direction is responsible for assisting in heating, the surface temperature of the second indoor heat exchanger 12 that may be touched is relatively low, which can prevent users from accidentally touching the high-temperature second indoor heat exchanger 12 in the heating mode. In addition, during defrosting, the first indoor heat exchanger 11 serves as a heat accumulator, enabling full-power heating to be started immediately after the defrosting is completed without waiting for the anti-cold wind, realizing the optimization of the defrosting scheme.

[0107] Adopting the technical solution of this embodiment, for an air conditioner composed of a compressor, a four-way valve, an outdoor heat exchanger, an outdoor throttling device (such as the second throttling device 22) and an original indoor heat exchanger (such as the second indoor heat exchanger 12), a first indoor heat exchanger 11 and a first throttling device 21 are arranged between the second throttling device 22 and the second indoor heat exchanger 12. When the air conditioner operates in the cooling mode, by adjusting the opening degrees of the first throttling device 21 and the second throttling device 22, when the second indoor heat exchanger 12 is responsible for cooling and dehumidifying, the first indoor heat exchanger 11 is responsible for reheating to reduce humidity, so as to avoid water being blown out from the air outlet of the air conditioner. Thus, by arranging a new indoor heat exchanger and a new throttling device between the outdoor throttling device of the air conditioner and the original indoor heat exchanger, when the air conditioner operates in the cooling mode, by adjusting the opening degrees of the original throttling device and the new throttling device, it is possible to avoid water floating out from the air outlet of the air conditioner and improve the user experience. At the same time, when the air conditioner operates in the cooling mode, by adjusting the opening degrees of the first throttling device 21 and the second throttling device 22, when the second indoor heat exchanger 12 is responsible for cooling and dehumidifying, the first indoor heat exchanger 11 can be responsible for reheating to reduce humidity. Since the first indoor heat exchanger 11 can undertake part of the cooling capacity and prevent the original heat exchanger in the air inlet direction of the indoor unit from freezing, it is possible to avoid having to turn off the compressor or reduce the throttling effect to defrost due to the freezing of the indoor unit, which affects the cooling efficiency of the air conditioner, and can improve the user experience. In addition, when the air conditioner operates in the heating mode, by adjusting the opening degrees of the first throttling device 21 and the second throttling device 22, when the second indoor heat exchanger 12 is responsible for mainly heating, the first indoor heat exchanger 11 is responsible for assisting in heating, avoiding the surface temperature of the second indoor heat exchanger 12 being too high during the heating operation of the air conditioner, and preventing burns when users or maintenance personnel accidentally touch the first indoor heat exchanger 11 or the second indoor heat exchanger 12, thus improving the safe use experience of users. Moreover, when the air conditioner operates in the defrosting mode for heating, by adjusting the opening degrees of the first throttling device 21 and the second throttling device 22, when the outdoor heat exchanger is defrosting and the second indoor heat exchanger 12 stores cold, the first indoor heat exchanger 11 stores heat, enabling full-power heating to start immediately after the defrosting ends without waiting for anti-cold air, improving the heating efficiency and the user experience.

[0108] According to an embodiment of the present invention, there is also provided a control device for an air conditioner corresponding to a control method for the air conditioner. Refer to Figure 6Schematic structural diagram of an embodiment of the device of the present invention. The air conditioner includes: an indoor unit and an outdoor unit. The indoor unit includes: a first indoor heat exchanger 11, a first throttling device 21, and a second indoor heat exchanger 12. The outdoor unit includes: a compressor, a four-way valve, an outdoor heat exchanger, and a second throttling device 22. Among them, the exhaust port of the compressor, after passing through the first valve port and the second valve port of the four-way valve, then passes through the outdoor heat exchanger, the second throttling device 22, the first indoor heat exchanger 11, the first throttling device 21, and the second indoor heat exchanger 12, and is connected to the fourth valve port of the four-way valve. The third valve port of the four-way valve returns to the suction port of the compressor.

[0109] Specifically, Figure 7 Schematic structural diagram of an embodiment of an anti-condensation and high-efficiency air conditioner of the present invention. The solution of the present invention uses a first indoor heat exchanger 11 and a second indoor heat exchanger 12 respectively located before and after the indoor unit fan, and a first throttling device 21 located between the first indoor heat exchanger 11 and the second indoor heat exchanger 12 to form an indoor heat exchanger system, where the scale of the first indoor heat exchanger 11 is much smaller than that of the second indoor heat exchanger 12, and structurally serves to isolate the air outlet from the second indoor heat exchanger 12. As Figure 7 shown in the anti-condensation and high-efficiency air conditioner, it includes: a compressor, a four-way valve, an outdoor heat exchanger, an outdoor unit fan, and a second throttling device 22 arranged on the outdoor side, and the outdoor heat exchanger is arranged on the air inlet side of the outdoor unit fan. As Figure 7 shown in the anti-condensation and high-efficiency air conditioner, it further includes: a first indoor heat exchanger 11, a second indoor heat exchanger 12, an indoor unit fan, and a first throttling device arranged on the indoor side, and the indoor unit fan is arranged between the second indoor heat exchanger 12 and the first indoor heat exchanger 11. Among them, the exhaust port of the compressor is connected to the first valve port of the four-way valve. The first valve port of the four-way valve, after passing through the outdoor heat exchanger, the second throttling device 22, the first indoor heat exchanger 11, the first throttling device 21, and the second indoor heat exchanger 12, is connected to the fourth valve port of the compressor. The third valve port of the compressor is connected to the suction port of the compressor. Among them, the first throttling device 21 and the second throttling device 22 are preferably electronic expansion valves or other devices with adjustable opening degrees to facilitate precise control of the pipe temperature of the first indoor heat exchanger 11. The first indoor heat exchanger 11 can have only copper pipes or other simple heat exchange structures. If it is to replace components such as grilles, it should be ensured that there are no sharp edges or other structures that may harm users and that users cannot pass through the first indoor heat exchanger 11 to touch other structures.

[0110] Preferably, the second indoor heat exchanger 12 is installed in the air inlet direction of the indoor unit fan of the air conditioner. The first indoor heat exchanger 11 is installed in the air outlet direction of the indoor unit fan of the air conditioner. Among them, the first indoor heat exchanger 11 should be installed as close to the air outlet as possible, and the second indoor heat exchanger 12 should be installed as close to the air inlet as possible. Refer to Figure 7 the example shown. The second indoor heat exchanger 12 is located on the air inlet side of the indoor unit fan, and the first indoor heat exchanger 11 is located on the air outlet side of the indoor unit fan. Of course, on the indoor side, the first indoor heat exchanger 11 can also be installed on the air inlet side of the indoor unit fan, but in this case, it will lead to the situation that users or maintenance personnel cannot avoid accidentally touching the working indoor unit fan. Therefore, in this case, an anti-mis-touch device needs to be additionally installed on the air outlet side of the indoor fan. In addition, in some cases, if the first indoor heat exchanger 11 is made in the form of a grille, the grille of the indoor unit can be directly replaced with the first indoor heat exchanger 11, which can relatively save the grille separately provided in the indoor unit.

[0111] As Figure 6 shown, the control device of the air conditioner includes: an acquisition unit 102 and a control unit 104 to execute the process of controlling the current opening degree of the first throttling device 21 and the current opening degree of the second throttling device 22 during the refrigeration operation of the air conditioner. For specific details, refer to the following exemplary description.

[0112] Among them, the control unit 104 is configured to control the current opening degrees of both the first throttling device 21 and the second throttling device 22 to be preset opening degrees when the air conditioner starts and operates in the refrigeration mode, so as to make the first indoor heat exchanger 11 warm up to reduce humidity and make the second indoor heat exchanger 12 perform refrigeration and dehumidification. Specifically, after the refrigerant at normal temperature and pressure after the first throttling of the second throttling device 22 enters the indoor unit, it first enters the first indoor heat exchanger 11 to heat up and reduce the humidity of the air blown out from the air outlet of the indoor unit, and then undergoes secondary throttling through the first throttling device to become a low-temperature and low-pressure refrigerant, and then enters the second indoor heat exchanger 12 to heat up and dehumidify the air entering the air inlet of the indoor unit. Among them, the current opening degree of the first throttling device 21 is opening degree D1, and the current opening degree of the second throttling device 22 is opening degree D2. For the specific functions and processing of the control unit 104, refer to step S110.

[0113] The obtaining unit 102 is configured to obtain the ambient temperature of the indoor unit during the refrigeration operation of the air conditioner, which is recorded as the current indoor ambient temperature of the indoor unit, such as the ambient temperature T1 on the indoor side. And obtain the pipe temperature of the first indoor heat exchanger 11, which is recorded as the current pipe temperature of the first indoor heat exchanger 11, such as the pipe temperature T3 of the first indoor heat exchanger 11. For the specific functions and processes of this obtaining unit 102, refer to step S120.

[0114] The control unit 104 is further configured to adjust the current opening degree of the first throttling device 21 and the current opening degree of the second throttling device 22 according to the current indoor ambient temperature of the indoor unit, the current pipe temperature of the first indoor heat exchanger 11, and a preset indoor ambient temperature threshold, so as to control the refrigeration and dehumidification degree of the second indoor heat exchanger 12 by adjusting the refrigerant temperature in the first indoor heat exchanger 11, which is beneficial to reducing the supply air humidity at the air outlet of the indoor unit and preventing the air outlet of the indoor unit from blowing water. It is also beneficial to reducing the surface temperature of the second indoor heat exchanger 12 and preventing users or maintenance personnel from being scalded when accidentally touching the second indoor heat exchanger 12, thereby improving the user experience. For the specific functions and processes of this control unit 104, also refer to step S130.

[0115] Specifically, Figure 8 FIG. is a schematic diagram of the refrigerant flow path of an embodiment of an anti-condensation and high-efficiency air conditioner of the present invention in the refrigeration mode and the heating defrosting mode. As Figure 8 shown, when the air conditioner and its control system are powered on and running, the high-temperature and high-pressure refrigerant discharged by the compressor enters the outdoor heat exchanger through the four-way valve to release heat and cool down. The low-temperature and high-humidity air supply passing through the second indoor heat exchanger 12 absorbs heat and raises the temperature and reduces the humidity in the first indoor heat exchanger 11. The low-temperature and low-pressure refrigerant returns to the compressor through the four-way valve. Among them, by adjusting the opening degree of the second throttling device 22, it is ensured that the refrigerant temperature flowing into the first indoor heat exchanger 11 is slightly lower than the target ambient temperature. By adjusting the opening degree of the first throttling device 21, it is ensured that the refrigeration effect of the second indoor heat exchanger 12 reaches the best level.

[0116] Specifically, as Figure 8As shown in the figure, when the air conditioner operates in the cooling mode, the high-temperature and high-pressure refrigerant discharged from the compressor outlet passes through the four-way valve and first releases heat through the outdoor heat exchanger, becoming a refrigerant with a relatively high temperature and high pressure. Then, after being preliminarily throttled by the second throttling device 22, it becomes a refrigerant at normal temperature and pressure. To avoid heat exchange when passing through the indoor and outdoor connection pipes, the refrigerant at normal temperature and pressure enters the indoor side and first enters the first indoor heat exchanger 11 to heat and dehumidify the air sent by the indoor unit fan on the air supply side, preventing the humidity of the mixed air after the air sent by the indoor unit fan on the air supply side mixes with the indoor air from being too high. Then, it undergoes secondary throttling through the first throttling device 21 and becomes a low-temperature and low-pressure refrigerant before entering the second indoor heat exchanger 12 to absorb heat and dehumidify. Finally, it returns to the compressor through the suction port of the compressor to repeat this cycle. Since the original heat exchanger cools the air to a relatively low temperature, thereby reducing the moisture content, and then the air is reheated by the small heat exchanger to reduce the humidity of the outlet air. At this time, when the low-temperature and low-humidity air sent out from the air conditioner outlet mixes with the surrounding high-temperature and high-humidity air, its temperature will not be lower than the dew point temperature. Therefore, it is possible to prevent water from being carried by the air sent out from the outlet of the indoor unit during the cooling operation of the air conditioner, thus solving the problem of water floating easily from the outlet of the air conditioner and enhancing the user experience.

[0117] A control method for an anti-condensation and highly efficient air conditioner proposed by the solution of the present invention is to add a throttling device (such as the first throttling device 21) and a small heat exchanger (such as the first indoor heat exchanger 11) between the original heat exchanger in the indoor unit (such as the second indoor heat exchanger 12) and the original throttling device in the outdoor unit (such as the second throttling device 22), and the small heat exchanger (such as the first indoor heat exchanger 11) is located in the air outlet direction of the indoor unit. Specifically, a small heat exchanger (i.e., the first indoor heat exchanger 11) is additionally added at the air supply outlet of the indoor unit to assist in refrigeration or heating, and a throttling device (i.e., the first throttling device 21) is added between the original heat exchanger in the indoor unit (i.e., the second indoor heat exchanger 12) and the first indoor heat exchanger 11. When the air conditioner operates in the refrigeration mode, in combination with the corresponding parameters of the indoor environment temperature of the air conditioner (such as the ambient temperature T1), the pipe temperature of the small heat exchanger (such as the first indoor heat exchanger 11) (such as the temperature T3), the operating time of the air conditioner (such as the time t1), and the pipe temperature of the outdoor heat exchanger (such as the temperature T4), the opening degrees of the newly added throttling device (such as the first throttling device 21) and the original throttling device in the outdoor unit (such as the second throttling device 22) are adjusted to realize the adjustment of the refrigerant flow rate at the inlet of the small heat exchanger (such as the first indoor heat exchanger 11) and the refrigerant flow rate at the outlet of the small heat exchanger (such as the first indoor heat exchanger 11), so as to realize the adjustment of the corresponding parameters of the air outlet temperature of the air conditioner, the surface temperature of the original heat exchanger in the indoor unit (such as the second indoor heat exchanger 12), and the pipe temperature of the outdoor heat exchanger (such as the temperature T4), so as to at least solve the problem that water is likely to float at the air outlet of the air conditioner and improve the user experience. At the same time, the solution of the present invention also solves the problem that when the indoor unit freezes, the compressor needs to be turned off or the throttling effect is reduced to defrost naturally, resulting in a decrease in the refrigeration effect, and improves the user experience.

[0118] In some embodiments, the control unit 104 adjusts the current opening degree of the first throttling device 21 and the current opening degree of the second throttling device 22 according to the current indoor environment temperature of the indoor unit, the current pipe temperature of the first indoor heat exchanger 11, and a preset indoor environment temperature threshold, including:

[0119] The control unit 104 is specifically further configured to determine whether the current indoor environment temperature of the indoor unit is greater than the sum of the current pipe temperature of the first indoor heat exchanger 11 and the preset indoor environment temperature threshold, and determine whether the current indoor environment temperature of the indoor unit is less than the current pipe temperature of the first indoor heat exchanger 11. For the specific functions and processes of the control unit 104, refer to step S210.

[0120] The control unit 104 is specifically further configured to, if it is determined that the current indoor environmental temperature of the indoor unit is greater than the sum of the current pipe temperature of the first indoor heat exchanger 11 and a preset indoor environmental temperature threshold, control the current opening degree of the second throttling device 22 to increase, and control the current opening degree of the first throttling device 21 to decrease. For the specific functions and processes of this control unit 104, refer to step S220.

[0121] The control unit 104 is specifically further configured to, if it is determined that the current indoor environmental temperature of the indoor unit is less than or equal to the sum of the current pipe temperature of the first indoor heat exchanger 11 and a preset indoor environmental temperature threshold, and the current indoor environmental temperature of the indoor unit is greater than or equal to the current pipe temperature of the first indoor heat exchanger 11, control the current opening degrees of both the second throttling device 22 and the first throttling device 21 to be maintained at the preset opening degree. For the specific functions and processes of this control unit 104, refer to step S230.

[0122] The control unit 104 is specifically further configured to, if it is determined that the current indoor environmental temperature of the indoor unit is less than the current pipe temperature of the first indoor heat exchanger 11, control the current opening degree of the second throttling device 22 to decrease, and control the current opening degree of the first throttling device 21 to increase. For the specific functions and processes of this control unit 104, refer to step S240.

[0123] Specifically, Figure 10 This is a schematic flowchart of an embodiment of the control method in the cooling mode of an anti-condensation and high-efficiency air conditioner according to the present invention. In the solution of the present invention, when the air conditioner operates in the cooling mode, the second indoor heat exchanger 12 located on the air inlet side of the indoor unit fan can effectively reduce the return air temperature below the dew point to achieve the dehumidification function. The dehumidified low-temperature and high-humidity return air then enters the first indoor heat exchanger 11 to absorb heat and return to temperature, ensuring that the air outlet temperature of the air conditioner will not be too low, and at the same time reducing the air outlet humidity to avoid situations such as water spraying at the air outlet that seriously affect the user experience. As Figure 10 shown, the control method in the cooling mode of the anti-condensation and high-efficiency air conditioner includes:

[0124] Step S11: When the operating mode of the air conditioner is switched to the cooling mode, start the cooling mode of the air conditioner. The control system of the air conditioner adjusts the opening degrees D1 of the first throttling device 21 and D2 of the second throttling device 22 to the preset opening degrees, and then execute step S12.

[0125] Step S12: The control system of the air conditioner obtains the indoor environmental temperature of the air conditioner detected by the indoor environmental temperature sensor (such as the environmental temperature T1 on the indoor side), obtains the preset deviation parameter T2 preset in the controller of the air conditioner, then executes step S12, and obtains the pipe temperature T3 of the first indoor heat exchanger 11 detected by the temperature sensor of the first indoor heat exchanger 11, and then executes step S13.

[0126] Step S13: Compare the magnitudes of the environmental temperature T1 on the indoor side, the pipe temperature T3 of the first indoor heat exchanger 11, and the preset deviation parameter T2, and correspondingly execute the corresponding steps among step S14, step S15, and step S16 according to the comparison result.

[0127] Step S14: If T1 > T2 + T3, control the opening D2 of the second throttling device 22 to increase, and control the opening D1 of the first throttling device 21 to decrease, and then return to step S13 to perform cyclic comparison without switching the operating mode or shutting down.

[0128] Step S15: If T1 < T3, control the opening D1 of the first throttling device 21 to increase, and control the opening D2 of the second throttling device 22 to decrease, and then return to step S13 to perform cyclic comparison without switching the operating mode or shutting down.

[0129] Step S16: If T3 ≤ T1 ≤ T2 + T3, control the opening D1 of the first throttling device 21 and the opening D2 of the second throttling device 22 to both maintain at the preset opening, and then return to step S13 to perform cyclic comparison without switching the operating mode or shutting down.

[0130] As Figure 8 and Figure 10 shown, when the second indoor heat exchanger 12 freezes during the refrigeration operation of the air conditioner, the control system of the air conditioner automatically increases the throttling effect of the second throttling device 22 and reduces the throttling effect of the first throttling device 21, reduces the refrigerant temperature in the first indoor heat exchanger 11 and increases the refrigerant temperature in the second indoor heat exchanger 12, so as to achieve no decrease in the refrigeration effect while thawing the second indoor heat exchanger 12, avoiding the need to shut down the compressor or reduce the throttling effect for defrosting due to indoor unit freezing, which affects the refrigeration efficiency of the air conditioner, and can solve the problem that the compressor needs to be shut down or the throttling effect needs to be reduced for natural defrosting when the indoor unit freezes, resulting in a decrease in the refrigeration effect, and improve the user experience.

[0131] In some embodiments, the control device of the air conditioner according to the solution of the present invention further includes: the process of controlling the current opening of the first throttling device 21 and the current opening of the second throttling device 22 during the heating operation of the air conditioner. For specific details, please refer to the following exemplary description.

[0132] Among them, the control unit 104 is further configured to, when the air conditioner operates in the heating mode after startup, control the current opening degree of the first throttling device 21 to a preset maximum opening degree, and control the current opening degrees of the second throttling devices 22 to preset opening degrees, so that the relatively high-temperature and high-pressure refrigerant after passing through the second indoor heat exchanger first passes through the first throttling device 21 and then passes through the first indoor heat exchanger 11 to release heat, so as to reduce the surface temperature of the first indoor heat exchanger 11, and at this time, the surface temperature of the second indoor heat exchanger will not be too high, avoiding the risk of high-temperature scalding caused by accidentally touching the evaporator (i.e., the first indoor heat exchanger 11 and the second indoor heat exchanger). Among them, the current opening degree of the first throttling device 21 is the opening degree D1, and the current opening degree of the second throttling device 22 is the opening degree D2. For the specific functions and processes of the control unit 104, refer to step S310.

[0133] Specifically, Figure 9 FIG. is a schematic diagram of the refrigerant flow path of an embodiment of an anti-condensation and high-efficiency air conditioner of the present invention in the heating mode. As Figure 9 shown, when the air conditioner and its control system are powered on and running, the high-temperature and high-pressure refrigerant discharged from the compressor enters the second indoor heat exchanger 12 through the four-way valve to release heat and cool down. The first throttling device 21 is fully opened, so that the first indoor heat exchanger 11 can also perform heating. At this time, since the refrigerant has been fully released heat in the second indoor heat exchanger 12, the surface temperature of the first indoor heat exchanger 11 will not be too high. Adjust the opening degree of the second throttling device 22 to ensure that the heating effect of the second indoor heat exchanger 12 reaches the best level. Then, it returns to the compressor through the four-way valve at a low temperature and low pressure.

[0134] As Figure 9 shown, when the air conditioner is operating in heating mode, the high-temperature and high-pressure refrigerant discharged from the exhaust port of the compressor is redirected (i.e., reversed) through the four-way valve, first passes through the second indoor heat exchanger 12 to release heat, and becomes a relatively high-temperature and high-pressure refrigerant. The first throttling device 21 is fully opened, and these refrigerants then enter the first indoor heat exchanger 11 to release heat. At this time, the surface temperature of the first indoor heat exchanger 11 has dropped to a sufficiently low temperature, avoiding the risk of high-temperature scalding caused by accidentally touching the evaporator (i.e., the first indoor heat exchanger 11). Then, it passes through the second throttling device 22 and the outdoor heat exchanger in sequence, and returns to the suction port of the compressor to repeat this cycle, thereby solving the problem that the surface temperature of the evaporator is too high and prone to danger during heating operation, and improving the user experience.

[0135] The acquisition unit 102 is further configured to, during the heating operation of the air conditioner, acquire the operation duration of the air conditioner in the heating mode, denoted as the current operation duration of the air conditioner in the heating mode, such as the operation duration t1. And acquire the pipe temperature of the outdoor heat exchanger, denoted as the current pipe temperature of the outdoor heat exchanger, such as the pipe temperature T4 of the outdoor heat exchanger. For the specific functions and processing of the control unit 104, refer to step S320.

[0136] The control unit 104 is further configured to determine whether the air conditioner needs to enter the heating defrosting mode according to the current operation duration of the air conditioner in the heating mode, the current pipe temperature of the outdoor heat exchanger, a first preset time threshold, a second preset time threshold, and a preset defrosting start temperature threshold. The first preset time threshold is such as the preset time parameter t2, the second preset time threshold is such as the preset time parameter t3, and the preset defrosting start temperature threshold is such as the temperature 0°C. For the specific functions and processing of the control unit 104, refer to step S330.

[0137] In some embodiments, the control unit 104 determines whether the air conditioner needs to enter the heating defrosting mode according to the current operation duration of the air conditioner in the heating mode, the current pipe temperature of the outdoor heat exchanger, a first preset time threshold, a second preset time threshold, and a preset defrosting start temperature threshold, including:

[0138] The control unit 104 is specifically further configured to determine whether the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrosting start temperature threshold, and determine whether the current operation duration of the air conditioner in the heating mode is less than the first preset time threshold. For the specific functions and processing of the control unit 104, refer to step S410.

[0139] The control unit 104 is specifically further configured to, if it is determined that the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrosting start temperature threshold and the current operation duration of the air conditioner in the heating mode is less than the first preset time threshold, start timing to obtain a timing time, and determine whether the timing time is greater than the second preset time threshold: if so, determine that the air conditioner needs to enter the heating defrosting mode, otherwise control the air conditioner to maintain the current state and then return to re-determine whether the timing time is greater than the second preset time threshold. For the specific functions and processing of the control unit 104, refer to step S420.

[0140] The control unit 104 is specifically further configured to, if it is determined that the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrosting start temperature threshold and the current operation duration of the air conditioner in the heating mode is greater than or equal to the first preset time threshold, determine that the air conditioner needs to enter the heating defrosting mode. For the specific functions and processing of the control unit 104, refer to step S430.

[0141] The control unit 104 is specifically further configured to, if it is determined that the current pipe temperature of the outdoor heat exchanger is greater than the preset defrost start temperature threshold, control the air conditioner to maintain the current state and then return to re-determine whether the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrost start temperature threshold, and determine whether the current operation duration of the air conditioner in the heating mode is less than the first preset time threshold. For the specific functions and processes of this control unit 104, refer to step S440.

[0142] Specifically, Figure 11 FIG. is a schematic flowchart of an embodiment of a control method for a heating mode of an anti-condensation and high-efficiency air conditioner according to the present invention. In the solution of the present invention, when the air conditioner operates in heating mode, the high-temperature refrigerant preferentially releases heat and cools down to a suitable temperature in the indoor heat exchanger, and then enters the first indoor heat exchanger 11 to further release heat. Since the first indoor heat exchanger 11 is blocked at the air outlet, it can effectively prevent users from accidentally touching the fan blades or the second indoor heat exchanger 12 operating at a high temperature. As Figure 11 shown, the control method for the heating mode of the anti-condensation and high-efficiency air conditioner includes:

[0143] Step S21: After the operation mode of the air conditioner is switched to the heating mode, start the heating mode of the air conditioner. The opening degree D1 of the first throttling device 21 is adjusted to the maximum value, and the opening degree D2 of the second throttling device 22 is adjusted to the preset opening degree until the operation mode is switched, the air conditioner is turned off, or the heating defrost mode is entered, and then step S22 is executed.

[0144] Step S22: Time the operation time of the air conditioner in the heating mode to obtain the operation duration t1 of the air conditioner in the heating mode. Obtain the pipe temperature T4 of the outdoor heat exchanger detected by the temperature sensor of the outdoor heat exchanger of the air conditioner, and obtain the preset time parameter t2 and the preset time parameter t3 preset in the controller of the air conditioner, and then execute step S23.

[0145] Step S23: Compare the pipe temperature T4 of the outdoor heat exchanger with 0 °C, and compare the operation duration t1 of the air conditioner in the heating mode with the preset time parameter t2, and correspondingly execute the corresponding steps in step S24, step S25, and step S26 according to the comparison results.

[0146] Step S24: If T4 ≤ 0 °C and t1 ≤ t2, start timing and obtain the timing time t4, and then execute step S27.

[0147] Step S25: If T4 ≤ 0 °C and t1 ≥ t2, execute step S32.

[0148] Step S26: If T4 > 0°C, then control the air conditioner to maintain its original state, and then return to Step S23 to perform cyclic comparison without switching the operating mode, shutting down, or entering the heating defrost mode.

[0149] Step S27: Compare the timing time t4 with the preset time parameter t3. If t4 > t3, then enter the heating defrost mode and execute Step S32. If t4 ≤ t3, then maintain the original state, and then return to Step S23 to perform cyclic comparison without switching the operating mode, shutting down, or entering the heating defrost mode.

[0150] As Figure 8 shown, during the heating operation of the air conditioner, when the control system of the air conditioner monitors that the pipe temperature T4 of the outdoor heat exchanger is lower than 0°C and the operating time exceeds 40 minutes, it enters the heating defrost mode. In the heating defrost mode, the high-temperature and high-pressure refrigerant discharged by the compressor enters the outdoor heat exchanger through the four-way valve to release heat and cool down, realizing defrosting. The second throttle device 22 is fully opened to ensure that the temperature of the refrigerant flowing into the first indoor heat exchanger 11 does not decrease, realizing heat storage. Adjust the opening degree of the first throttle device 21 to ensure the fastest defrosting speed, and then the low-temperature and low-pressure refrigerant returns to the compressor through the four-way valve. When the control system of the air conditioner monitors that the pipe temperature T4 of the outdoor heat exchanger is higher than 10°C, it enters the heating mode. In the heating mode, the four-way valve changes direction, restarts the indoor unit fan, and operates normally according to the heating mode. For details, please refer to Figure 9 the example shown and its related description.

[0151] The control unit 104 is further configured to, if it is determined that the air conditioner needs to enter the heating defrost mode, control the air conditioner to switch from the heating mode to the heating defrost mode, and when the air conditioner is operating in the heating defrost mode, adjust the current opening degree of the first throttle device 21 and the current opening degree of the second throttle device 22 so that the air conditioner can directly restart the indoor unit fan of the air conditioner and switch to the heating mode after the heating defrost mode ends. For the specific functions and processes of the control unit 104, please also refer to Step S340.

[0152] In the solution of the present invention, a throttling device (such as the first throttling device 21) and a small heat exchanger (such as the first indoor heat exchanger 11) are added between the original heat exchanger of the indoor unit (such as the second indoor heat exchanger 12) and the original throttling device of the outdoor unit (such as the second throttling device 22), and the small heat exchanger (such as the first indoor heat exchanger 11) is located in the air outlet direction of the indoor unit. Specifically, a small heat exchanger (i.e., the first indoor heat exchanger 11) is additionally added at the air supply outlet of the indoor unit for auxiliary refrigeration or auxiliary heating, and a throttling device (i.e., the first throttling device 21) is added between the original heat exchanger of the indoor unit (i.e., the second indoor heat exchanger 12) and the first indoor heat exchanger 11. During the heating operation or heating defrosting operation of the air conditioner, in combination with the corresponding parameters of the indoor environmental temperature of the air conditioner (such as the environmental temperature T1), the pipe temperature of the small heat exchanger (such as the first indoor heat exchanger 11) (such as the temperature T3), the operating time of the air conditioner (such as the time t1), and the pipe temperature of the outdoor heat exchanger (such as the temperature T4), the opening degrees of the newly added throttling device (such as the first throttling device 21) and the original throttling device of the outdoor unit (such as the second throttling device 22) are adjusted, solving the problem that the surface temperature of the evaporator is too high and prone to danger during the heating operation, and improving the user experience. Moreover, it solves the problem that after heating defrosting, the indoor fan cannot be immediately turned on for heating air supply, and the compressor must be operated for a period of time before the indoor fan can be turned on for air supply, resulting in too long a cycle for heating defrosting of the air conditioner, and improving the user experience.

[0153] In some embodiments, the control unit 104 controls the air conditioner to switch from the heating mode to the heating defrosting mode, and when the air conditioner is operating in the heating defrosting mode, adjusts the current opening degree of the first throttling device 21 and the current opening degree of the second throttling device 22, including:

[0154] The control unit 104 is specifically further configured to control the indoor unit fan of the air conditioner to stop rotating, control the air conditioner to switch from the heating mode to the heating defrosting mode, adjust the current opening degree of the first throttling device 21 to the preset opening degree, and adjust the current opening degree of the second throttling device 22 to the preset maximum opening degree, so that during the defrosting process of the outdoor heat exchanger, the first indoor heat exchanger 11 stores heat and the second indoor heat exchanger 12 stores cold. For the specific functions and processing of the control unit 104, refer to step S510. Specifically, the high-temperature and high-pressure refrigerant discharged by the compressor first enters the outdoor heat exchanger for defrosting after passing through the four-way valve, and then the relatively high-temperature and high-pressure refrigerant output by the second throttling device 22 enters the first indoor heat exchanger 11 to store heat, and after passing through the first throttling device 21, it becomes a low-temperature and low-pressure refrigerant and then enters the second indoor heat exchanger 12 to store cold. In this way, full-power heating can start immediately at the end of defrosting without waiting for anti-cold air, realizing the optimization of the defrosting scheme.

[0155] The control unit 104 is further specifically configured to determine whether the current pipe temperature of the outdoor heat exchanger is greater than a preset defrost start temperature threshold. The preset defrost start temperature threshold is, for example, 10°C. For the specific functions and processes of this control unit 104, refer to step S520.

[0156] The control unit 104 is further specifically configured that if it is determined that the current pipe temperature of the outdoor heat exchanger is greater than the preset defrost start temperature threshold, after controlling the air conditioner to exit the heating defrost mode, it controls the indoor fan of the air conditioner to restart, and controls the air conditioner to directly switch from the heating defrost mode to the heating mode. For the specific functions and processes of this control unit 104, refer to step S530.

[0157] The control unit 104 is further specifically configured that if it is determined that the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrost start temperature threshold, it controls the air conditioner to maintain the current state, and then returns to re-determine whether the current pipe temperature of the outdoor heat exchanger is greater than the preset defrost start temperature threshold. For the specific functions and processes of this control unit 104, refer to step S540.

[0158] Specifically, as Figure 11 shown, the control method in the heating mode of the anti-condensation high-efficiency air conditioner further includes: step S31, starting the air conditioner to the heating defrost mode, and then performing step S32.

[0159] Step S32, controlling the indoor fan of the air conditioner to stop rotating, controlling the four-way valve of the air conditioner to reverse, adjusting the opening degree D1 of the first throttling device 21 to the preset opening degree, and adjusting the opening degree D2 of the second throttling device 22 to the maximum opening degree, and then performing step S33.

[0160] Step S33, comparing the pipe temperature T4 of the outdoor heat exchanger with 10°C, and correspondingly performing the corresponding steps in step S34 and step S35 according to the comparison result.

[0161] Step S34, if T4 > 10°C, then exit the heating defrost mode, and then perform step 36.

[0162] Step S35, if T4 ≤ 10°C, then maintain the original state, and then return to step 33.

[0163] Step S36, controlling the indoor fan of the air conditioner to restart, controlling the four-way valve of the air conditioner to reverse, adjusting the opening degree D1 of the first throttling device 21 to the maximum opening degree, adjusting the opening degree D2 of the second throttling device 22 to the preset opening degree, and then returning to step 21.

[0164] In step S32, when entering the heating defrost mode, the system stops the indoor unit fan, the four-way valve changes direction, the opening degree D1 of the first throttling device 21 is adjusted to the preset opening degree, and the opening degree D2 of the second throttling device 22 is adjusted to the maximum value. Until the defrosting ends, immediately restart the indoor unit fan, and control the four-way valve to change direction and the opening degrees of the first throttling device 21 and the second throttling device 22 according to the control logic related to the heating mode. In step 36, when the heating defrost operation of the air conditioner ends, the control system of the air conditioner can directly turn on the indoor unit fan without waiting for the compressor to run for a period of time to replace the low-temperature refrigerant in the indoor heat exchanger, effectively reducing the defrost cycle, thereby improving the heating efficiency.

[0165] As Figure 8 shown, when the air conditioner is in the heating defrost operation, the indoor unit fan stops. The high-temperature and high-pressure refrigerant coming out of the exhaust port of the compressor is redirected (i.e., changes direction) through the four-way valve, first enters the outdoor heat exchanger to defrost the outdoor heat exchanger. The second throttling device 22 is fully open, and the relatively high-temperature and high-pressure refrigerant enters the first indoor heat exchanger 11 to store heat. After passing through the first throttling device 21, it becomes low-temperature and low-pressure refrigerant and then enters the second indoor heat exchanger 12 to store cold, and finally returns to the suction port of the compressor to repeat this cycle until the defrosting ends. At this time, the indoor unit fan is restarted for heating operation. In this way, full-power heating can start immediately when the defrosting ends without waiting for anti-cold air, realizing the optimization of the defrosting scheme, and can solve the problem that after heating defrosting, the indoor fan cannot be immediately turned on for heating air supply, and the compressor must be run for a period of time before the indoor fan can be turned on for air supply, resulting in too long a cycle of heating defrosting of the air conditioner, and improving the user experience.

[0166] The solution of the present invention is applicable to cabinet air conditioners or wall-mounted air conditioners, and can prevent the indoor unit from blowing out water. Specifically, for double indoor heat exchangers, one indoor heat exchanger (such as the second indoor heat exchanger 12) arranged in the air inlet direction of the indoor unit is responsible for cooling, and one indoor heat exchanger (such as the first indoor heat exchanger 11) arranged in the air outlet direction of the indoor unit is responsible for dehumidification. And when one indoor heat exchanger (such as the first indoor heat exchanger 11) arranged in the air outlet direction is responsible for dehumidification, the surface temperature of the second indoor heat exchanger 12 that may be touched is relatively low, which can prevent users from accidentally touching the high-temperature second indoor heat exchanger 12 in the heating mode. In addition, when defrosting, the first indoor heat exchanger 11 serves as a heat accumulator, so that full-power heating can start immediately when the defrosting ends without waiting for anti-cold air, realizing the optimization of the defrosting scheme.

[0167] Since the processing and functions realized by the device in this embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, for the details not described in the description of this embodiment, reference can be made to the relevant descriptions in the foregoing embodiments and will not be elaborated here.

[0168] Adopting the technical solution of the present invention, for an air conditioner composed of a compressor, a four-way valve, an outdoor heat exchanger, an outdoor throttling device (such as the second throttling device 22) and an original indoor heat exchanger (such as the second indoor heat exchanger 12), a first indoor heat exchanger 11 and a first throttling device 21 are arranged between the second throttling device 22 and the second indoor heat exchanger 12. When the air conditioner operates in the cooling mode, by adjusting the opening degrees of the first throttling device 21 and the second throttling device 22, when the second indoor heat exchanger 12 is responsible for cooling and dehumidifying, the first indoor heat exchanger 11 is responsible for dehumidifying, which can prevent water from being carried by the air blown out of the air outlet of the indoor unit during the cooling operation of the air conditioner, thus at least solving the problem that water is likely to float out of the air outlet of the air conditioner. At the same time, it solves the problem that when the indoor unit freezes, the compressor needs to be turned off or the throttling effect is reduced to defrost naturally, resulting in a decrease in the cooling effect, and improves the user experience. In addition, when the air conditioner operates in the heating mode, it can also solve the problem that the surface temperature of the evaporator is too high and prone to danger during the heating operation. When the air conditioner operates in the heating defrosting mode, it can also solve the problem that after the heating defrosting, the internal fan cannot be immediately turned on for heating air supply, and the compressor must be operated for a period of time before the internal fan can be turned on for air supply, resulting in an overly long heating defrosting cycle of the air conditioner, and improves the user experience.

[0169] According to an embodiment of the present invention, there is also provided an air conditioner corresponding to a control device of an air conditioner. The air conditioner may include: the control device of the air conditioner described above.

[0170] Since the processing and functions realized by the air conditioner in this embodiment are basically corresponding to the embodiments, principles and examples of the foregoing device, for the details not described in the description of this embodiment, reference may be made to the relevant descriptions in the foregoing embodiments, and details will not be repeated here.

[0171] Adopting the technical solution of the present invention, for an air conditioner composed of a compressor, a four-way valve, an outdoor heat exchanger, an outdoor throttling device (such as the second throttling device 22) and an original indoor heat exchanger (such as the second indoor heat exchanger 12), a first indoor heat exchanger 11 and a first throttling device 21 are arranged between the second throttling device 22 and the second indoor heat exchanger 12. When the air conditioner operates in the cooling mode, by adjusting the opening degrees of the first throttling device 21 and the second throttling device 22, when the second indoor heat exchanger 12 is responsible for refrigeration and dehumidification, the first indoor heat exchanger 11 is responsible for reheating to reduce humidity, avoiding water-carrying in the air supply from the air outlet of the air conditioner, and also avoiding the need to turn off the compressor or reduce the throttling effect to defrost due to freezing of the indoor unit, which affects the refrigeration efficiency of the air conditioner and improves the user experience; in addition, when the air conditioner operates in the heating mode, it can also solve the problem that the surface temperature of the evaporator is too high and prone to danger during heating operation, improving the user experience; and, when the air conditioner operates in the heating defrosting mode, it can also solve the problem that after heating defrosting, the internal fan cannot be immediately turned on for heating air supply, and the compressor must be operated for a period of time before the internal fan can be turned on for air supply, resulting in an overly long heating defrosting cycle of the air conditioner, improving the user experience.

[0172] According to an embodiment of the present invention, there is also provided a storage medium corresponding to a control method of an air conditioner. The storage medium includes a stored program, wherein when the program runs, it controls the device where the storage medium is located to execute the above-mentioned control method of the air conditioner.

[0173] Since the processing and functions realized by the storage medium of this embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, for the details not described in the description of this embodiment, reference can be made to the relevant descriptions in the foregoing embodiments and will not be elaborated here.

[0174] Adopting the technical solution of the present invention, for an air conditioner composed of a compressor, a four-way valve, an outdoor heat exchanger, an outdoor throttling device (such as the second throttling device 22) and an original indoor heat exchanger (such as the second indoor heat exchanger 12), a first indoor heat exchanger 11 and a first throttling device 21 are arranged between the second throttling device 22 and the second indoor heat exchanger 12. When the air conditioner operates in the cooling mode, by adjusting the opening degrees of the first throttling device 21 and the second throttling device 22, when the second indoor heat exchanger 12 is responsible for cooling and dehumidifying, the first indoor heat exchanger 11 is responsible for reheating to reduce humidity, avoiding water being carried by the air blown out from the air outlet of the air conditioner, and at least solving the problem that water is likely to float at the air outlet of the air conditioner, improving the user experience. Moreover, when the air conditioner operates in the cooling mode, it also solves the problem that when the indoor unit freezes, the compressor needs to be turned off or the throttling effect is reduced to defrost naturally, resulting in a decrease in the cooling effect, improving the user experience; in addition, when the air conditioner operates in the heating mode, it can also solve the problem that the surface temperature of the evaporator is too high and is prone to danger during the heating operation, improving the user experience; and when the air conditioner operates in the heating defrosting mode, it can also solve the problem that after the heating defrosting, the internal fan cannot be immediately turned on for heating and air supply, and the compressor must be operated for a period of time before the internal fan can be turned on for air supply, resulting in an excessively long heating defrosting cycle, improving the user experience.

[0175] In summary, it is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned advantageous ways can be freely combined and superimposed.

[0176] The above are only the embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A control method for an air conditioner, characterized in that, The air conditioner includes: an indoor unit and an outdoor unit; the indoor unit includes: a first indoor heat exchanger (11), a first throttling device (21), and a second indoor heat exchanger (12); the outdoor unit includes: a compressor, a four-way valve, an outdoor heat exchanger, and a second throttling device (22); wherein, the exhaust port of the compressor, after passing through the first valve port and the second valve port of the four-way valve, then passes through the outdoor heat exchanger, the second throttling device (22), the first indoor heat exchanger (11), the first throttling device (21), and the second indoor heat exchanger (12), and is connected to the fourth valve port of the four-way valve; the third valve port of the four-way valve returns to the suction port of the compressor; the control method of the air conditioner includes: When the air conditioner operates in the cooling mode after startup, control the current opening degrees of the first throttling device (21) and the second throttling device (22) to be preset opening degrees, so that the first indoor heat exchanger (11) warms up to reduce humidity, and the second indoor heat exchanger (12) cools and dehumidifies. Obtain the ambient temperature of the indoor unit, denoted as the current indoor ambient temperature of the indoor unit; and obtain the pipe temperature of the first indoor heat exchanger (11), denoted as the current pipe temperature of the first indoor heat exchanger (11). According to the current indoor ambient temperature of the indoor unit, the current pipe temperature of the first indoor heat exchanger (11), and a preset indoor ambient temperature threshold, adjust the current opening degrees of the first throttling device (21) and the second throttling device (22), so as to control the cooling and dehumidifying degree of the second indoor heat exchanger (12) by adjusting the refrigerant temperature in the first indoor heat exchanger (11).

2. The control method of the air conditioner according to claim 1, characterized in that, Wherein, The second indoor heat exchanger (12) is installed in the air inlet direction of the indoor unit fan of the air conditioner; the first indoor heat exchanger (11) is installed in the air outlet direction of the indoor unit fan of the air conditioner.

3. The control method of the air conditioner according to claim 1 or 2, characterized in that, According to the current indoor ambient temperature of the indoor unit, the current pipe temperature of the first indoor heat exchanger (11), and a preset indoor ambient temperature threshold, adjusting the current opening degrees of the first throttling device (21) and the second throttling device (22) includes: Determine whether the current indoor ambient temperature of the indoor unit is greater than the sum of the current pipe temperature of the first indoor heat exchanger (11) and the preset indoor ambient temperature threshold, and determine whether the current indoor ambient temperature of the indoor unit is less than the current pipe temperature of the first indoor heat exchanger (11). If it is determined that the current indoor ambient temperature of the indoor unit is greater than the sum of the current pipe temperature of the first indoor heat exchanger (11) and the preset indoor ambient temperature threshold, then control the current opening degree of the second throttling device (22) to increase, and control the current opening degree of the first throttling device (21) to decrease. If it is determined that the current indoor ambient temperature of the indoor unit is less than or equal to the sum of the current pipe temperature of the first indoor heat exchanger (11) and the preset indoor ambient temperature threshold, and the current indoor ambient temperature of the indoor unit is greater than or equal to the current pipe temperature of the first indoor heat exchanger (11), then control the current opening degree of the second throttling device (22) and the current opening degree of the first throttling device (21) to be maintained at the preset opening degree; If it is determined that the current indoor ambient temperature of the indoor unit is less than the current pipe temperature of the first indoor heat exchanger (11), then control the current opening degree of the second throttling device (22) to decrease, and control the current opening degree of the first throttling device (21) to increase.

4. The control method of the air conditioner according to claim 1 or 2, characterized in that, It further includes: When the air conditioner operates in the heating mode after startup, control the current opening degree of the first throttling device (21) to be the preset maximum opening degree, and control the current opening degree of the second throttling device (22) to be the preset opening degree, so as to reduce the surface temperature of the first indoor heat exchanger (11); Obtain the running duration of the air conditioner in the heating mode, denoted as the current running duration of the air conditioner in the heating mode; and obtain the pipe temperature of the outdoor heat exchanger, denoted as the current pipe temperature of the outdoor heat exchanger; According to the current running duration of the air conditioner in the heating mode, the current pipe temperature of the outdoor heat exchanger, as well as the first preset time threshold, the second preset time threshold, and the preset defrosting start temperature threshold, determine whether the air conditioner needs to enter the heating defrosting mode; If it is determined that the air conditioner needs to enter the heating defrosting mode, then control the air conditioner to switch from the heating mode to the heating defrosting mode, and when the air conditioner operates in the heating defrosting mode, adjust the current opening degree of the first throttling device (21) and the current opening degree of the second throttling device (22), so that the indoor fan of the air conditioner can be directly restarted and switched to the heating mode after the heating defrosting mode ends.

5. The control method of the air conditioner according to claim 4, characterized in that, Determining whether the air conditioner needs to enter the heating defrosting mode according to the current running duration of the air conditioner in the heating mode, the current pipe temperature of the outdoor heat exchanger, as well as the first preset time threshold, the second preset time threshold, and the preset defrosting start temperature threshold, includes: Determine whether the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrosting start temperature threshold, and determine whether the current running duration of the air conditioner in the heating mode is less than the first preset time threshold; If it is determined that the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrosting start temperature threshold and the current running duration of the air conditioner in the heating mode is less than the first preset time threshold, then start timing to obtain the timing time, and determine whether this timing time is greater than the second preset time threshold: if so, determine that the air conditioner needs to enter the heating defrosting mode, otherwise control the air conditioner to maintain the current state; If it is determined that the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrosting start temperature threshold and the current running duration of the air conditioner in the heating mode is greater than or equal to the first preset time threshold, then determine that the air conditioner needs to enter the heating defrosting mode; If it is determined that the current pipe temperature of the outdoor heat exchanger is greater than the preset defrost start temperature threshold, control the air conditioner to maintain its current state.

6. The control method of the air conditioner according to claim 4, characterized in that, Control the air conditioner to switch from the heating mode to the heating defrost mode, and when the air conditioner is operating in the heating defrost mode, adjust the current opening degree of the first throttling device (21) and the current opening degree of the second throttling device (22), including: Control the indoor fan of the air conditioner to stop rotating, control the air conditioner to switch from the heating mode to the heating defrost mode, adjust the current opening degree of the first throttling device (21) to the preset opening degree, and adjust the current opening degree of the second throttling device (22) to the preset maximum opening degree, so that during the defrosting process of the outdoor heat exchanger, the first indoor heat exchanger (11) stores heat and the second indoor heat exchanger (12) stores cold; Determine whether the current pipe temperature of the outdoor heat exchanger is greater than the preset defrost start temperature threshold; If it is determined that the current pipe temperature of the outdoor heat exchanger is greater than the preset defrost start temperature threshold, after controlling the air conditioner to exit the heating defrost mode, control the indoor fan of the air conditioner to restart, and control the air conditioner to directly switch from the heating defrost mode to the heating mode; If it is determined that the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrost start temperature threshold, control the air conditioner to maintain its current state.

7. A control device for an air conditioner, characterized in that, The air conditioner includes: an indoor unit and an outdoor unit; the indoor unit includes: a first indoor heat exchanger (11), a first throttling device (21) and a second indoor heat exchanger (12); the outdoor unit includes: a compressor, a four-way valve, an outdoor heat exchanger and a second throttling device (22); wherein, the exhaust port of the compressor passes through the first valve port and the second valve port of the four-way valve, and then passes through the outdoor heat exchanger, the second throttling device (22), the first indoor heat exchanger (11), the first throttling device (21) and the second indoor heat exchanger (12), and is connected to the fourth valve port of the four-way valve; the third valve port of the four-way valve returns to the suction port of the compressor; the control device of the air conditioner includes: A control unit configured to, when the air conditioner starts and operates in the cooling mode, control the current opening degrees of both the first throttling device (21) and the second throttling device (22) to be the preset opening degrees, so that the first indoor heat exchanger (11) warms up to reduce humidity and the second indoor heat exchanger (12) cools and dehumidifies; An acquisition unit configured to acquire the ambient temperature of the indoor unit, denoted as the current indoor ambient temperature of the indoor unit; and acquire the pipe temperature of the first indoor heat exchanger (11), denoted as the current pipe temperature of the first indoor heat exchanger (11); The control unit is further configured to adjust the current opening degree of the first throttling device (21) and the current opening degree of the second throttling device (22) according to the current indoor environmental temperature of the indoor unit, the current pipe temperature of the first indoor heat exchanger (11), and a preset indoor environmental temperature threshold value, so as to control the refrigeration and dehumidification degree of the second indoor heat exchanger (12) by adjusting the refrigerant temperature in the first indoor heat exchanger (11).

8. The control device of the air conditioner according to claim 7, characterized in that, Wherein, the second indoor heat exchanger (12) is installed in the air inlet direction of the indoor fan of the air conditioner; the first indoor heat exchanger (11) is installed in the air outlet direction of the indoor fan of the air conditioner.

9. The control device of an air conditioner according to claim 7 or 8, characterized in that, The control unit adjusts the current opening degree of the first throttling device (21) and the current opening degree of the second throttling device (22) according to the current indoor environmental temperature of the indoor unit, the current pipe temperature of the first indoor heat exchanger (11), and a preset indoor environmental temperature threshold value, including: determining whether the current indoor environmental temperature of the indoor unit is greater than the sum of the current pipe temperature of the first indoor heat exchanger (11) and the preset indoor environmental temperature threshold value, and determining whether the current indoor environmental temperature of the indoor unit is less than the current pipe temperature of the first indoor heat exchanger (11); if it is determined that the current indoor environmental temperature of the indoor unit is greater than the sum of the current pipe temperature of the first indoor heat exchanger (11) and the preset indoor environmental temperature threshold value, controlling the current opening degree of the second throttling device (22) to increase and controlling the current opening degree of the first throttling device (21) to decrease; if it is determined that the current indoor environmental temperature of the indoor unit is less than or equal to the sum of the current pipe temperature of the first indoor heat exchanger (11) and the preset indoor environmental temperature threshold value and the current indoor environmental temperature of the indoor unit is greater than or equal to the current pipe temperature of the first indoor heat exchanger (11), controlling the current opening degrees of both the second throttling device (22) and the first throttling device (21) to be maintained at the preset opening degree; if it is determined that the current indoor environmental temperature of the indoor unit is less than the current pipe temperature of the first indoor heat exchanger (11), controlling the current opening degree of the second throttling device (22) to decrease and controlling the current opening degree of the first throttling device (21) to increase.

10. The control device of an air conditioner according to claim 7 or 8, characterized in that, It further includes: when the control unit operates in the heating mode after the air conditioner is started, controlling the current opening degree of the first throttling device (21) to be the preset maximum opening degree and controlling the current opening degree of the second throttling device (22) to be the preset opening degree, so as to reduce the surface temperature of the first indoor heat exchanger (11); the acquisition unit is further configured to acquire the running duration of the air conditioner in the heating mode, denoted as the current running duration of the air conditioner in the heating mode; and acquire the pipe temperature of the outdoor heat exchanger, denoted as the current pipe temperature of the outdoor heat exchanger. The control unit is further configured to determine whether the air conditioner needs to enter the heating defrosting mode according to the current operation duration of the air conditioner in the heating mode, the current pipe temperature of the outdoor heat exchanger, a first preset time threshold, a second preset time threshold, and a preset defrosting start temperature threshold; The control unit is further configured to, if it is determined that the air conditioner needs to enter the heating defrosting mode, control the air conditioner to switch from the heating mode to the heating defrosting mode, and when the air conditioner is operating in the heating defrosting mode, adjust the current opening degree of the first throttling device (21) and the current opening degree of the second throttling device (22), so that the indoor unit fan of the air conditioner can be directly restarted and switched to the heating mode after the heating defrosting mode ends.

11. The control device of the air conditioner according to claim 10, characterized in that, The control unit determines whether the air conditioner needs to enter the heating defrosting mode according to the current operation duration of the air conditioner in the heating mode, the current pipe temperature of the outdoor heat exchanger, a first preset time threshold, a second preset time threshold, and a preset defrosting start temperature threshold, including: Determining whether the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrosting start temperature threshold, and determining whether the current operation duration of the air conditioner in the heating mode is less than the first preset time threshold; If it is determined that the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrosting start temperature threshold and the current operation duration of the air conditioner in the heating mode is less than the first preset time threshold, start timing to obtain the timing time, and determine whether the timing time is greater than the second preset time threshold: if so, determine that the air conditioner needs to enter the heating defrosting mode, otherwise control the air conditioner to maintain the current state; If it is determined that the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrosting start temperature threshold and the current operation duration of the air conditioner in the heating mode is greater than or equal to the first preset time threshold, determine that the air conditioner needs to enter the heating defrosting mode; If it is determined that the current pipe temperature of the outdoor heat exchanger is greater than the preset defrosting start temperature threshold, control the air conditioner to maintain the current state.

12. The control device of the air conditioner according to claim 10, characterized in that, The control unit controls the air conditioner to switch from the heating mode to the heating defrosting mode, and when the air conditioner is operating in the heating defrosting mode, adjusts the current opening degree of the first throttling device (21) and the current opening degree of the second throttling device (22), including: Controlling the indoor unit fan of the air conditioner to stop rotating, controlling the air conditioner to switch from the heating mode to the heating defrosting mode, adjusting the current opening degree of the first throttling device (21) to the preset opening degree, and adjusting the current opening degree of the second throttling device (22) to the preset maximum opening degree, so that during the defrosting process of the outdoor heat exchanger, the first indoor heat exchanger (11) stores heat and the second indoor heat exchanger (12) stores cold; Determining whether the current pipe temperature of the outdoor heat exchanger is greater than the preset defrosting start temperature threshold; If it is determined that the current pipe temperature of the outdoor heat exchanger is greater than the preset defrost start temperature threshold, after controlling the air conditioner to exit the heating defrost mode, control the indoor fan of the air conditioner to restart, and control the air conditioner to directly switch from the heating defrost mode to the heating mode; If it is determined that the current pipe temperature of the outdoor heat exchanger is less than or equal to the preset defrost start temperature threshold, control the air conditioner to maintain its current state.

13. An air conditioner, characterized in that, Comprising: The control device of the air conditioner according to any one of claims 7 to 12.

14. A storage medium, characterized in that, The storage medium includes a stored program, wherein when the program runs, it controls the device where the storage medium is located to execute the control method of the air conditioner according to any one of claims 1 to 6.

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