Air conditioner

Abstract

The invention relates to an air conditioner, and belongs to the technical field of air conditioners, the air conditioner comprises an indoor unit, an indoor heat exchanger, an outdoor unit, an outdoor heat exchanger, an outdoor fan, a compressor and a controller, the indoor unit is arranged indoors; the indoor heat exchanger is arranged in the indoor unit; the outdoor unit is arranged outdoors; the outdoor heat exchanger is arranged in the outdoor unit; the compressor is arranged in the outdoor unit; the controller is configured to calculate a refrigerant sound predicted value, and if the refrigerant sound predicted value is larger than a preset refrigerant sound value, the suction and exhaust pressure difference value of the compressor is calculated; if the suction and exhaust air pressure difference value of the compressor is smaller than a first preset air pressure difference value, the difference value between the current exhaust superheat degree value and the target exhaust superheat degree value is judged and defined as the superheat degree difference value, and if the superheat degree difference value is smaller than a preset difference value, the relation between the target exhaust superheat degree value and the exhaust superheat degree limiting value is judged; and if the target exhaust superheat degree value is smaller than the exhaust superheat degree limit value, the exhaust superheat degree of the compressor is increased.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioners, and in particular to an air conditioner. Background Art

[0002] Air conditioner is an air conditioner, which is a device that uses artificial means to adjust and control the temperature, humidity, flow rate and other parameters of the ambient air in a building or structure. Hanging air conditioners are widely used because of their high cost performance, small indoor space occupation, no restrictions on installation location, and easier matching with indoor decoration.

[0003] In air conditioning, the design of the refrigeration system must ensure that the refrigerant in the condenser is in the gas-liquid two-phase region as much as possible. The refrigerant enthalpy in this state is high and the system operation has high energy efficiency. However, if there is a lot of gaseous refrigerant in the refrigerant flowing out of the condenser, the refrigerant entering the throttling device will cause bubbles to burst due to the sudden decrease in flow area, producing a more significant refrigerant flow sound. The high noise of the air conditioner causes discomfort to users. Summary of the invention

[0004] The present invention solves one of the technical problems in the related art at least to a certain extent.

[0005] To this end, the present application aims to provide an air conditioner, which reduces the refrigerant sound and improves the user experience by calculating the refrigerant sound prediction value and judging the relationship between the target exhaust superheat value and the exhaust superheat limit value, thereby increasing the exhaust superheat.

[0006] To achieve the above object, the present invention provides an air conditioner, comprising:

[0007] Indoor unit;

[0008] An indoor heat exchanger, which is arranged in the indoor unit;

[0009] Outdoor unit;

[0010] an outdoor heat exchanger, which is arranged in the outdoor unit;

[0011] An outdoor fan, which is used to blow air through the outdoor heat exchanger to reduce the temperature of the refrigerant passing through the outdoor heat exchanger;

[0012] A compressor, which is arranged in the outdoor unit, and is used to transport refrigerant to the outdoor heat exchanger and the indoor heat exchanger;

[0013] A controller, wherein the controller is configured to: calculate a refrigerant sound prediction value, and if the refrigerant sound prediction value is greater than a preset refrigerant sound value, calculate a compressor suction and exhaust pressure difference value;

[0014] If the compressor suction and exhaust pressure difference is less than the first preset pressure difference, the difference between the current exhaust superheat value and the target exhaust superheat value is calculated, and the difference is defined as the superheat difference. If the superheat difference is less than the preset difference, the relationship between the target exhaust superheat value and the exhaust superheat limit is judged. If the target exhaust superheat value is less than the exhaust superheat limit, the compressor exhaust superheat is increased.

[0015] In the technical solution, by calculating the predicted value of the refrigerant sound and judging the relationship between the target exhaust superheat value and the exhaust superheat limit value, the exhaust superheat is increased to reduce the refrigerant sound and improve the user experience.

[0016] In some embodiments of the present application, the indoor heat exchanger is connected and communicated with a first pipeline and a second pipeline; the outdoor heat exchanger is connected and communicated with a third pipeline and a fourth pipeline;

[0017] The first pipeline is connected in parallel with the third pipeline and the fourth pipeline;

[0018] The second pipeline is connected in parallel with the third pipeline and the fourth pipeline;

[0019] The first pipeline, the second pipeline, the third pipeline and the fourth pipeline are respectively provided with a first regulating member, a second regulating member, a third regulating member and a fourth regulating member; the fourth pipeline is provided with a throttling member.

[0020] In the technical solution, the exhaust superheat is controlled by adjusting the first adjusting member, the second adjusting member, the third adjusting member and the fourth adjusting member to adjust the refrigerant sound.

[0021] In some embodiments of the present application, the controller is configured to:

[0022] If the compressor suction and exhaust pressure difference is not less than the first preset pressure difference and not more than the second preset pressure difference;

[0023] It is determined whether the current air conditioner is in a preset mode. If not, the second adjustment member and the third adjustment member are closed, the fourth adjustment member is opened, and the first adjustment member is controlled to be a preset opening.

[0024] In the technical solution, in this state, it indicates that the suction and exhaust pressure difference of the compressor is medium. In this case, only adjusting the exhaust superheat may be difficult to meet the demand. Therefore, the generation of refrigerant sound is further reduced by adjusting the first adjusting member, the second adjusting member, the third adjusting member and the fourth adjusting member.

[0025] In some embodiments of the present application, the controller is configured to: determine whether the current air conditioner is in a preset mode; if so, determine the superheat difference between the current exhaust superheat value and the target exhaust superheat value; if the superheat difference is less than the preset difference, increase the compressor exhaust superheat.

[0026] In the technical solution, by confirming that the air conditioner is in a preset mode to ensure that the current air conditioning system is in a stable state, the refrigerant noise is reduced by adjusting the compressor exhaust superheat value.

[0027] In some embodiments of the present application, the controller is configured as follows: If the target exhaust superheat value is equal to the exhaust superheat limit value; then determine whether the current speed of the outdoor fan has reached the maximum speed, and if not, increase the speed of the outdoor fan.

[0028] In the technical solution, when the target exhaust superheat value is equal to the exhaust superheat limit value, the need to reduce the refrigerant noise cannot be met by adjusting the exhaust superheat only. Therefore, the speed of the outdoor fan is adjusted to change the refrigerant state in the outdoor heat exchanger.

[0029] In some embodiments of the present application, the controller is configured to: when the speed of the outdoor fan increases, calculate the compressor target frequency value and obtain the current compressor frequency value, the difference between the compressor target frequency value and the current compressor frequency value is the frequency difference, if the frequency difference is greater than the first preset frequency value and the frequency difference is less than the second preset frequency value, then the frequency value of the current compressor is controlled to reach the compressor target frequency value.

[0030] In the technical solution, after the speed adjustment of the outdoor fan is completed, the refrigerant noise is further reduced by adjusting the compressor frequency. If the frequency difference is greater than the first preset frequency value and less than the second preset frequency value, it means that there is a certain difference between the current compressor frequency value and the compressor target frequency value, and the current compressor frequency needs to be adjusted.

[0031] In some embodiments of the present application, the controller is configured to increase the compressor frequency if the frequency difference is greater than a second preset frequency value.

[0032] In the technical solution, if the frequency difference of the compressor is greater than the second preset frequency value, it means that the gap between the current frequency value of the compressor and the target frequency value of the compressor is large, so the frequency of the compressor is directly increased to reduce the refrigerant sound.

[0033] In some embodiments of the present application, the controller is configured to: if the compressor suction and exhaust pressure difference is greater than a second preset pressure difference; then open the third adjustment member and the fourth adjustment member; determine the superheat difference between the current exhaust superheat value and the target exhaust superheat value, and if the superheat difference is less than the preset difference, then increase the compressor exhaust superheat.

[0034] In the technical solution, in this state, it means that the pressure difference in and out of the throttling device is too large. By controlling the third adjusting member and the fourth adjusting member, the pressure difference entering the throttling device is reduced to reduce the refrigerant noise.

[0035] In addition, the present application also provides an air conditioner, which includes:

[0036] Indoor unit;

[0037] An indoor heat exchanger, which is arranged in the indoor unit;

[0038] Outdoor unit;

[0039] an outdoor heat exchanger, which is arranged in the outdoor unit;

[0040] A compressor, which is arranged in the outdoor unit, and is used to transport refrigerant to the outdoor heat exchanger and the indoor heat exchanger;

[0041] A controller, wherein the controller is configured to: calculate a refrigerant sound prediction value, and if the refrigerant sound prediction value is greater than a preset refrigerant sound value, calculate a compressor suction and exhaust pressure difference value;

[0042] If the compressor suction and exhaust pressure difference is less than the first preset pressure difference, the first level mode is entered;

[0043] If the compressor suction and exhaust pressure difference is not less than the first preset pressure difference and not more than the second preset pressure difference, the second level 1 mode is entered;

[0044] If the compressor suction and exhaust pressure difference is greater than the second preset pressure difference, the third level one mode is entered.

[0045] In the technical solution, according to the relationship between the compressor suction and exhaust pressure difference and the first preset pressure difference and the second preset pressure difference, a corresponding mode is entered, and different operations are performed in the corresponding mode to achieve targeted reduction of refrigerant noise.

[0046] In some embodiments of the present application, the controller is configured to: in the first level mode, calculate the difference between the current exhaust superheat value and the target exhaust superheat value, and define the difference as the superheat difference; if the superheat difference is greater than the preset difference, enter the first level mode; if the superheat difference is less than the preset difference, enter the second level mode;

[0047] In the second level mode, it is determined whether the current air conditioner is in the preset mode. If not, it enters the third level mode; if yes, it enters the fourth level mode;

[0048] In the third level mode, determine whether the third adjustment member and the fourth adjustment member are turned on. If not, enter the fifth level mode; if so, enter the sixth level mode.

[0049] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 is a schematic diagram of the overall structure of an air conditioner according to an embodiment of the present application;

[0051] Figure 2 is a schematic structural diagram of an indoor unit of an air conditioner according to an embodiment of the present application;

[0052] Figure 3 is a main diagram of an indoor unit of an air conditioner according to an embodiment of the present application;

[0053] Figure 4 is a schematic diagram of an air conditioner according to an embodiment of the present application;

[0054] Figure 5 is a working flow chart of an air conditioner according to an embodiment of the present application;

[0055] Figure 6 is a working flow chart of an air conditioner according to an embodiment of the present application;

[0056] Figure 7 is a working flow chart of an air conditioner according to an embodiment of the present application;

[0057] Figure 8 is a working flow chart of an air conditioner according to an embodiment of the present application;

[0058] Fig. 9 is a working flow chart of an air conditioner according to an embodiment of the present application;

[0059] Fig.10 is a working flow chart of an air conditioner according to an embodiment of the present application;

[0060] Fig.11 is a working flow chart of an air conditioner according to an embodiment of the present application;

[0061] Fig.12 is a working flow chart of an air conditioner according to an embodiment of the present application;

[0062] Fig.13is a working flow chart of an air conditioner according to an embodiment of the present application;

[0063] Fig.14 is a working flow chart of an air conditioner according to an embodiment of the present application;

[0064] Fig.15 is a working flow chart of an air conditioner according to an embodiment of the present application;

[0065] Fig.16 It is a working flow chart of the air conditioner according to the implementation mode of the present application.

[0066] In the above figures: 100, indoor unit; 200, outdoor unit; 300, indoor heat exchanger; 400, outdoor heat exchanger; 500, compressor; 600, first regulating member; 700, second regulating member; 800, third regulating member; 900, fourth regulating member; 110, throttling member; 120, four-way valve. DETAILED DESCRIPTION

[0067] In the description of the present invention, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0068] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0070] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0071] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that elements, structures, and features in one embodiment may also be beneficially combined in other embodiments without further description.

[0072] In the present application, the air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, throttling and evaporation, and supplies cold or heat to the air that has been conditioned and heat exchanged. The compressor compresses the refrigerant gas in a low-temperature and low-pressure state and discharges the refrigerant gas in a high-temperature and high-pressure state. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process. The expansion valve throttles the liquid phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure gas-liquid two-phase refrigerant. In the evaporator, the refrigerant expanded in the expansion valve absorbs heat and evaporates, and is in a low-temperature and low-pressure state, and then the refrigerant gas returns to the compressor. The evaporator can achieve a refrigeration effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the whole cycle, the indoor unit of the air conditioner can adjust the temperature of the indoor space. The outdoor unit of the air conditioner refers to the part of the refrigeration cycle including the compressor and the outdoor heat exchanger, the indoor unit of the air conditioner includes the indoor heat exchanger, and the expansion valve may be provided in the indoor unit or the outdoor unit. The indoor heat exchanger and the outdoor heat exchanger may be used as a condenser or an evaporator, respectively. When the indoor heat exchanger is used as a condenser, the indoor unit of the air conditioner is used as a heater in the heating mode, and when the indoor heat exchanger is used as an evaporator, the indoor unit of the air conditioner is used as a cooler in the cooling mode.

[0073] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0074] As attached Figures 1 to 4 As shown, in an exemplary embodiment of the air conditioner of the present invention, the air conditioner includes: an indoor unit 100, an indoor heat exchanger 300, an outdoor unit 200, an outdoor heat exchanger 400, an outdoor fan, a compressor 500 and a controller, the indoor unit 100 is arranged indoors; the indoor heat exchanger 300 is arranged in the indoor unit 100; the outdoor unit 200 is arranged outdoors; the outdoor heat exchanger 400 is arranged in the outdoor unit 200; the outdoor fan is used to blow air through the outdoor heat exchanger 400 to reduce the temperature of the refrigerant passing through the outdoor heat exchanger 400; the compressor 500 is arranged in the outdoor unit 200, and the compressor 500 is used to transport refrigerant to the outdoor heat exchanger 400 and the indoor heat exchanger 300.

[0075] Please refer to Figures 5 to 16The controller is configured to: calculate the refrigerant sound prediction value, if the refrigerant sound prediction value is greater than the preset refrigerant sound value, then calculate the compressor suction and exhaust pressure difference value; if the compressor suction and exhaust pressure difference value is less than the first preset pressure difference value, then determine the difference between the current exhaust superheat value and the target exhaust superheat value, and define the difference as the superheat difference value, if the superheat difference value is less than the preset difference, then determine the relationship between the target exhaust superheat value and the exhaust superheat limit value, if the target exhaust superheat value is less than the exhaust superheat limit value, then increase the compressor exhaust superheat value.

[0076] Through the above technical solution, by calculating the predicted value of the refrigerant sound and judging the relationship between the target exhaust superheat value and the exhaust superheat limit value, the exhaust superheat is increased to reduce the refrigerant sound and improve the user experience.

[0077] Please refer to Figure 4 In some embodiments, the indoor heat exchanger 300 is connected and communicated with the first pipeline and the second pipeline; the outdoor heat exchanger 400 is connected and communicated with the third pipeline and the fourth pipeline; the first pipeline is connected in parallel with the third pipeline and the fourth pipeline; the second pipeline is connected in parallel with the third pipeline and the fourth pipeline; the first pipeline, the second pipeline, the third pipeline and the fourth pipeline are respectively provided with a first regulating member 600, a second regulating member 700, a third regulating member 800 and a fourth regulating member 900; the fourth pipeline is provided with a throttling member 110. By adjusting the first regulating member 600, the second regulating member 700, the third regulating member 800 and the fourth regulating member 900, the exhaust superheat is controlled to adjust the refrigerant sound.

[0078] During the operation of the air conditioner, the flow route of the refrigerant can be controlled by controlling the first adjusting member 600 , the second adjusting member 700 , the third adjusting member 800 , and the fourth adjusting member 900 .

[0079] In some embodiments, the air conditioner further includes an exhaust pressure sensor, an exhaust temperature sensor, an intake pressure sensor, an intake temperature sensor, a first middle temperature sensor, a first outlet temperature sensor, a second middle temperature sensor, and a second outlet temperature sensor. The exhaust pressure sensor, the exhaust temperature sensor, the intake pressure sensor, and the intake temperature sensor are all disposed in the outdoor unit 200 and are used to detect the compressor 500. The first middle temperature sensor and the first outlet temperature sensor are disposed in the indoor unit 100 and are used to detect the indoor heat exchanger 300. The second middle temperature sensor and the second outlet temperature sensor are disposed in the outdoor unit 200 and are used to detect the outdoor heat exchanger 400.

[0080] In some embodiments, in cooling mode, the outdoor heat exchanger 400 is used as a condenser and the indoor heat exchanger 300 is used as an evaporator. In heating mode, the outdoor heat exchanger 400 is used as an evaporator and the indoor heat exchanger 300 is used as a condenser. A four-way valve 120 is also provided between the compressor 500 and the indoor heat exchanger 300 and the outdoor heat exchanger 400, and the flow direction of the refrigerant can be adjusted by the four-way valve 120 to achieve switching between cooling mode and heating mode.

[0081] Please refer to Figures 5 to 16 In some embodiments, the controller is configured to: if the compressor suction and exhaust pressure difference is not less than the first preset pressure difference and does not exceed the second preset pressure difference; then determine whether the current air conditioner is in the preset mode, if not, close the second adjustment member 700 and the third adjustment member 800, open the fourth adjustment member 900, and control the first adjustment member 600 to the preset opening. In this state, it means that the compressor suction and exhaust pressure difference is medium. In this case, it may be difficult to meet the demand by adjusting only the exhaust superheat. Therefore, the generation of refrigerant sound is further reduced by adjusting the first adjustment member 600, the second adjustment member 700, the third adjustment member 800 and the fourth adjustment member 900. The preset mode is set according to different models and environments. It can be input by the user, sent by the cloud, or preset at the factory.

[0082] In some embodiments, the controller is configured to: determine whether the current air conditioner is in a preset mode, and if so, determine the difference between the current exhaust superheat value and the target exhaust superheat value, and if the difference is less than the preset difference, increase the compressor exhaust superheat. By confirming that the air conditioner is in the preset mode, the current air conditioning system is ensured to be in a stable state, and the refrigerant noise is reduced by adjusting the compressor exhaust superheat value.

[0083] Please refer to Figures 5 to 16 In some embodiments, the controller is configured as follows: If the target exhaust superheat value is equal to the exhaust superheat limit value, it is determined whether the current speed of the outdoor fan reaches the maximum speed, and if not, the speed of the outdoor fan is increased. When the target exhaust superheat value is equal to the exhaust superheat limit value, the need to reduce the refrigerant noise cannot be met by adjusting the exhaust superheat only. Therefore, the speed of the outdoor fan is adjusted to change the refrigerant state in the outdoor heat exchanger 400.

[0084] Please refer to Figures 5 to 16In some embodiments, the controller is configured to: when the speed of the outdoor fan increases, calculate the compressor target frequency value, and obtain the current frequency value of the compressor 500. The difference between the compressor target frequency value and the current frequency value of the compressor 500 is the frequency difference. If the frequency difference is greater than the first preset frequency value, and the frequency difference is less than the second preset frequency value, the frequency value of the current compressor 500 is controlled to reach the compressor target frequency value. After the speed adjustment of the outdoor fan is completed, the refrigerant sound is further reduced by adjusting the frequency of the compressor 500. If the frequency difference is greater than the first preset frequency value, and the frequency difference is less than the second preset frequency value, it means that there is a certain difference between the frequency value of the current compressor 500 and the compressor target frequency value, and the frequency of the current compressor 500 needs to be adjusted.

[0085] In some embodiments, the controller is configured to: if the frequency difference is greater than the second preset frequency value, increase the frequency of the compressor 500. If the frequency difference of the compressor 500 is greater than the second preset frequency value, it means that the gap between the current frequency value of the compressor 500 and the target frequency value of the compressor is large, so the frequency of the compressor 500 is directly increased to reduce the refrigerant sound.

[0086] In some embodiments, the controller is configured to: if the compressor suction and exhaust pressure difference value is greater than the second preset pressure difference value; then open the third adjustment member 800 and the fourth adjustment member 900; calculate the superheat difference between the current exhaust superheat value and the target exhaust superheat value, and if the superheat difference is less than the preset difference, increase the compressor exhaust superheat. In this state, it means that the pressure difference between the inlet and outlet throttling member 110 is too large, and by controlling the third adjustment member 800 and the fourth adjustment member 900, the pressure difference entering the throttling member 110 is reduced to reduce the refrigerant noise.

[0087] Please refer to Figures 1 to 4 In addition, another embodiment of the present application provides an air conditioner, which includes the same as those in the above embodiments: an indoor unit 100, an indoor heat exchanger 300, an outdoor unit 200, an outdoor heat exchanger 400, a compressor 500 and a controller.

[0088] Please refer to Figures 5 to 16 The difference between this embodiment and the above embodiment is that the controller is configured to enter the refrigerant sound adjustment program when the refrigerant sound needs to be adjusted or when the machine is turned on. After entering the refrigerant sound adjustment program, the initial mode is entered, and the exhaust superheat, subcooling and refrigerant sound prediction values ​​are calculated in the initial mode.

[0089] In some embodiments, the controller is configured to enter the initial mode after entering the refrigerant sound adjustment program and waiting for a first preset time. The first preset time is used to allow the air conditioner to enter a stable working state, thereby improving the accuracy of the detection result. The first preset time is set according to different models and environments, and the first preset time can be input by the user, sent by the cloud, or preset by the factory.

[0090] In some embodiments, the calculation formulas for exhaust superheat, subcooling and refrigerant noise prediction values ​​are as follows:

[0091]

[0092] DSH=T d -T c

[0093]

[0094] Among them, DSH is the compressor exhaust superheat, S is the refrigerant sound prediction value, Fre is the air conditioning compressor operating frequency, Tsub is the subcooling degree, PS is the suction pressure of the indoor heat exchanger, and Pd is the exhaust pressure of the outdoor heat exchanger; among them, a1, b1, c1, d1, e1, f1, n are constants, and the specific values ​​of a1, b1, c1, d1, e1, f1, n are adjusted according to different models; is the outlet refrigerant temperature of the outdoor heat exchanger, Tc is the refrigerant temperature in the middle of the outdoor heat exchanger, and Td is the compressor exhaust temperature.

[0095] Please refer to Figures 5 to 16 In some embodiments, the controller is configured to, after the initial mode, determine the relationship between the predicted value of the refrigerant sound and the preset refrigerant sound value. If the predicted value of the refrigerant sound is less than the preset refrigerant sound value, it means that the current refrigerant sound is small and there is no need to adjust the air conditioner. If the predicted value of the refrigerant sound is greater than the preset refrigerant sound value, it is confirmed that the air conditioner needs to be adjusted to reduce the refrigerant sound. Therefore, if the predicted value of the refrigerant sound is greater than the preset refrigerant sound value, the compressor suction and exhaust pressure difference value is calculated, and the relationship between the compressor suction and exhaust pressure difference value and the first preset air pressure difference value and the second preset air pressure difference value is determined.

[0096] In some embodiments, the compressor suction and exhaust pressure difference value is calculated as follows:

[0097] ΔP=P d -P s

[0098] Among them, ΔP is the compressor suction and exhaust pressure difference, P d is the exhaust pressure of the compressor, P s is the suction pressure of the compressor.

[0099] In some embodiments, if the compressor suction and exhaust pressure difference is less than the first preset pressure difference, the first level mode is entered; the first preset pressure difference is set according to different machine models and environments, and the first preset pressure difference can be input by the user, sent to the cloud, or preset at the factory.

[0100] In some embodiments, in the first level mode, the difference between the current exhaust superheat value and the target exhaust superheat value is calculated, and the difference is defined as the superheat difference; if the superheat is greater than the preset difference, the first level mode is entered; if the superheat difference is less than the preset difference, the second level mode is entered.

[0101] Please refer to Figures 5 to 16 In some embodiments, the controller is configured to: after entering the first and second level modes, maintain the current operating state and maintain the second preset time, and then re-enter the initial mode. If the superheat difference between the current exhaust superheat value and the target exhaust superheat value is greater than the preset difference, it means that the current air conditioning system is unstable, so wait for the second preset time for the air conditioner system to stabilize and then re-enter the initial mode and re-judge. The second preset time is set according to different models and environments. The second preset time can be input by the user, sent by the cloud, or preset by the factory.

[0102] Please refer to Figures 5 to 16 In some embodiments, the controller is configured to: in the second secondary mode, determine the relationship between the target exhaust superheat value and the exhaust superheat limit value. If the target exhaust superheat value is less than the exhaust superheat limit value, enter the first tertiary mode. If the target exhaust superheat value is equal to the exhaust superheat limit value, enter the second tertiary mode.

[0103] Please refer to Figures 5 to 16 In some embodiments, the controller is configured to: in the first three-stage mode, increase the compressor exhaust superheat, which is specifically embodied by increasing a preset incremental value on the compressor exhaust superheat value.

[0104] In some embodiments, the controller is configured to re-enter the initial mode after increasing the compressor discharge superheat in the first three-stage mode.

[0105] In some embodiments, the controller is configured to: in the first three-stage mode, after increasing the compressor discharge superheat, wait for a second preset time and then re-enter the initial mode.

[0106] In some embodiments, the compressor exhaust superheat value is adjusted by adjusting the openings of the first adjusting member 600 , the second adjusting member 700 , the third adjusting member 800 , and the fourth adjusting member 900 .

[0107] In some embodiments, the controller is configured to determine whether the current speed of the outdoor fan has reached the maximum speed in the second or third level mode; if the current speed of the outdoor fan is less than the maximum speed, it enters the first or fourth level mode; if the current speed of the outdoor fan is equal to the maximum speed, it enters the second or fourth level mode.

[0108] In some embodiments, the maximum speed of the outdoor fan is set according to different models and environments, and can be input by the user, sent to the cloud, or preset at the factory.

[0109] Please refer to Figures 5 to 16 In some embodiments, the controller is configured to increase the speed of the outdoor fan in the first four-level mode. Specifically, a preset incremental speed is added to the current speed of the outdoor fan. And the current speed of the outdoor fan does not exceed the maximum speed. The preset incremental speed is set according to different models and environments, and can be input by the user, sent by the cloud, or preset at the factory.

[0110] In some embodiments, the controller is configured to calculate the compressor target frequency value and obtain the current frequency value of the compressor 500 in the second four-level mode. The difference between the compressor target frequency value and the current frequency value of the compressor 500 is the frequency difference, and the relationship between the frequency difference and the first preset frequency value and the second preset frequency value is determined.

[0111] In some embodiments, the target operating frequency of the compressor is calculated as follows:

[0112]

[0113] Among them, Fre s is the target operating frequency of the compressor, a and b are constants, is the target exhaust superheat value, Fan ocu is the speed of the outdoor fan or indoor fan on the condenser side; Fre ocu Current compressor operating frequency, where a and b are preset or sent from the cloud according to different models.

[0114] In some embodiments, the controller is configured to enter the first five-level mode if the frequency difference is less than the first preset frequency value in the second four-level mode; enter the second five-level mode if the frequency difference is greater than the first preset frequency value and less than the second preset frequency value; and enter the third five-level mode if the frequency difference is greater than the second preset frequency value.

[0115] Please refer to Figures 5 to 16In some embodiments, the controller is configured to keep the current state running in the first five-level mode, and re-enter the initial mode for detection every third preset time interval. The number of detections is recorded. If the first five-level mode is entered after continuous detection, and the number of detections exceeds the preset number, the current state is kept running and the refrigerant sound adjustment program is exited. In the first five-level mode, it means that the current air conditioner is in a normal working state and no refrigerant sound adjustment is required. The preset number and the third preset time are set according to different models and environments, and can be input by the user, sent by the cloud, or preset by the factory.

[0116] In some embodiments, the controller is configured to control the frequency value of the current compressor 500 to reach the compressor target frequency value in the second five-level mode, and re-enter the initial mode after maintaining the fourth preset time. The fourth preset time is set according to different models and environments, and can be input by the user, sent by the cloud, or preset by the factory.

[0117] Please refer to Figures 5 to 16 In some embodiments, the controller is configured to increase the frequency of the compressor 500 in the third level 5 mode. Specifically, the preset incremental frequency is increased on the current operating frequency of the compressor 500.

[0118] In some embodiments, the controller is configured to enter the second level 1 mode if the compressor suction and exhaust pressure difference is not less than a first preset pressure difference and not more than a second preset pressure difference.

[0119] In some embodiments, the controller is configured to, in the second level mode, determine whether the air conditioner is currently in the preset mode, if not, enter the third level mode; if yes, enter the fourth level mode.

[0120] In some embodiments, the controller is configured to, in the third and second level modes, close the second regulating member 700 and the third regulating member 800, open the fourth regulating member 900, and control the first regulating member 600 to a preset opening. And after the fifth preset time, enter the initial mode. In the third and second level modes, when the refrigerant flows, it passes through the first pipeline, the second pipeline, and the throttling member 110 on the second pipeline. The fifth preset time and the preset opening are set according to different models and environments, and can be input by the user, sent by the cloud, or preset by the factory.

[0121] Please refer to Figures 5 to 16 In some embodiments, the controller is configured to, in the fourth level two mode, determine the superheat difference between the current exhaust superheat value and the target exhaust superheat value, and enter the third level three mode if the superheat difference is greater than the preset difference; if the superheat difference is less than the preset difference, enter the fourth level three mode.

[0122] In some embodiments, the controller is configured to, in the third level mode, maintain the current state for a sixth preset time and then re-enter the initial mode. The sixth preset time is set according to different models and environments, and can be input by the user, sent by the cloud, or preset by the factory.

[0123] Please refer to Figures 5 to 16 In some embodiments, the controller is configured to, in the fourth third-level mode, determine the difference between the current exhaust superheat value and the target exhaust superheat value, and if the difference is less than a preset difference, and the target exhaust superheat value is less than the exhaust superheat limit, increase the compressor exhaust superheat. Specifically, a preset incremental value is added to the compressor exhaust superheat value, and the compressor exhaust superheat value does not exceed the exhaust superheat limit.

[0124] In some embodiments, the controller is configured to, in the fourth third-level mode, determine the superheat difference between the current exhaust superheat value and the target exhaust superheat value, and enter the second third-level mode if the superheat value is equal to the exhaust superheat limit.

[0125] In some embodiments, the controller is configured to enter the third level one mode if the suction and exhaust pressure difference of the compressor is greater than the second preset pressure difference.

[0126] Please refer to Figures 5 to 16 In some embodiments, the controller is configured to: in the third primary mode, determine whether the third adjustment member 800 and the fourth adjustment member 900 are turned on, if not, enter the fifth secondary mode; if yes, enter the sixth secondary mode.

[0127] In some embodiments, the controller is configured to: in the fifth secondary mode, control the first adjustment member 600 and the second adjustment member 700 to have the same opening, and maintain the seventh preset time before re-entering the initial mode. The seventh preset time is set according to different models and environments, and can be input by the user, sent by the cloud, or preset by the factory.

[0128] Please refer to Figures 5 to 16 In some embodiments, the controller is configured to: in the sixth secondary mode, determine the difference between the current exhaust superheat value and the target exhaust superheat value, if the difference is greater than the preset difference; then re-enter the initial mode after running for the eighth preset time. If the difference is less than the preset difference, then enter the fifth third-level mode. The eighth preset time is set according to different models and environments, and can be input by the user, sent by the cloud, or preset by the factory.

[0129] Please refer to Figures 5 to 16In some embodiments, the controller is configured to: in the fifth third-level mode, determine the relationship between the target exhaust superheat value and the exhaust superheat limit value, and if the target exhaust superheat value is less than the exhaust superheat limit value, increase the compressor exhaust superheat value. Specifically, add a preset increment value to the compressor exhaust superheat value, and the compressor exhaust superheat value does not exceed the exhaust superheat limit value. And re-enter the initial mode after the ninth preset time. The ninth preset time is set according to different models and environments, and can be input by the user, sent by the cloud, or preset by the factory.

[0130] In some embodiments, the controller is configured to: in the fifth third-level mode, determine the relationship between the target exhaust superheat value and the exhaust superheat limit value, and enter the second third-level mode if the target exhaust superheat value is greater than the exhaust superheat limit value.

[0131] In some embodiments, the above-mentioned preset difference is set according to different models and environments, and can be input by the user, sent by the cloud, or preset at the factory.

[0132] In some embodiments, the first regulating member 600 and the second regulating member 700 are electronic expansion valves, and the third regulating member 800 and the fourth regulating member 900 are solenoid valves.

[0133] In some embodiments, when the exhaust gas superheat value of the compressor 500 exceeds the target exhaust gas superheat value, the expansion valve is opened to adjust the refrigerant sound.

[0134] In some embodiments, the throttle 110 is a capillary tube.

[0135] The air conditioner in the present application includes but is not limited to a wall-mounted air conditioner and a floor-standing air conditioner.

[0136] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An air conditioner, characterized in that: It includes: Indoor unit; An indoor heat exchanger, which is arranged in the indoor unit; Outdoor unit; an outdoor heat exchanger, which is arranged in the outdoor unit; An outdoor fan, which is used to blow air through the outdoor heat exchanger to reduce the temperature of the refrigerant passing through the outdoor heat exchanger; A compressor, which is arranged in the outdoor unit, and is used to transport refrigerant to the outdoor heat exchanger and the indoor heat exchanger; A controller, wherein the controller is configured to: calculate a predicted value of a refrigerant sound, and if the predicted value of a refrigerant sound is greater than a preset refrigerant sound value, calculate a suction and exhaust pressure difference value of the compressor; If the compressor suction and exhaust pressure difference is less than the first preset pressure difference, the difference between the current exhaust superheat value and the target exhaust superheat value is calculated, and the difference is defined as the superheat difference. If the superheat difference is less than the preset difference, the relationship between the target exhaust superheat value and the exhaust superheat limit is judged. If the target exhaust superheat value is less than the exhaust superheat limit, the compressor exhaust superheat is increased.

2. The air conditioner according to claim 1, characterized in that: The indoor heat exchanger is connected and communicated with a first pipeline and a second pipeline; the outdoor heat exchanger is connected and communicated with a third pipeline and a fourth pipeline; The first pipeline is connected in parallel with the third pipeline and the fourth pipeline; The second pipeline is connected in parallel with the third pipeline and the fourth pipeline; The first pipeline, the second pipeline, the third pipeline and the fourth pipeline are respectively provided with a first regulating member, a second regulating member, a third regulating member and a fourth regulating member; the fourth pipeline is provided with a throttling member.

3. The air conditioner according to claim 2, characterized in that: The controller is configured to: If the compressor suction and exhaust pressure difference is not less than the first preset pressure difference and not more than the second preset pressure difference; It is determined whether the current air conditioner is in a preset mode. If not, the second adjustment member and the third adjustment member are closed, the fourth adjustment member is opened, and the first adjustment member is controlled to be a preset opening.

4. The air conditioner according to claim 3, characterized in that: The controller is configured to: determine whether the current air conditioner is in a preset mode, and if so, calculate the superheat difference between the current exhaust superheat value and the target exhaust superheat value, and if the superheat difference is less than the preset difference, increase the compressor exhaust superheat.

5. The air conditioner according to claim 4, characterized in that: The controller is configured to: if the target exhaust superheat value is equal to the exhaust superheat limit value; determine whether the current rotation speed of the outdoor fan reaches the maximum rotation speed, and if not, increase the rotation speed of the outdoor fan.

6. The air conditioner according to claim 5, characterized in that: The controller is configured to: when the speed of the outdoor fan increases, calculate the compressor target frequency value and obtain the current compressor frequency value, the difference between the compressor target frequency value and the current compressor frequency value is the frequency difference, if the frequency difference is greater than the first preset frequency value and the frequency difference is less than the second preset frequency value, then control the current compressor frequency value to reach the compressor target frequency value.

7. The air conditioner according to claim 6, characterized in that: The controller is configured to increase the compressor frequency if the frequency difference is greater than a second preset frequency value.

8. The air conditioner according to claim 7, characterized in that: The controller is configured to: if the compressor suction and exhaust pressure difference is greater than a second preset pressure difference; turn on the third adjustment member and the fourth adjustment member; determine the superheat difference between the current exhaust superheat value and the target exhaust superheat value, and if the superheat difference is less than the preset difference, increase the compressor exhaust superheat.

9. An air conditioner, characterized in that: It includes: Indoor unit; An indoor heat exchanger, which is arranged in the indoor unit; Outdoor unit; an outdoor heat exchanger, which is arranged in the outdoor unit; A compressor, which is arranged in the outdoor unit, and is used to transport refrigerant to the outdoor heat exchanger and the indoor heat exchanger; A controller, wherein the controller is configured to: calculate a refrigerant sound prediction value, and if the refrigerant sound prediction value is greater than a preset refrigerant sound value, calculate a compressor suction and exhaust pressure difference value; If the compressor suction and exhaust pressure difference is less than the first preset pressure difference, the first level mode is entered; If the compressor suction and exhaust pressure difference is not less than the first preset pressure difference and not more than the second preset pressure difference, the second level 1 mode is entered; If the compressor suction and exhaust pressure difference is greater than the second preset pressure difference, the third level one mode is entered.

10. The air conditioner according to claim 9, characterized in that: The controller is configured to: in the first level mode, calculate the difference between the current exhaust superheat value and the target exhaust superheat value, and define the difference as the superheat difference; If the superheat difference is greater than the preset difference, the first and second levels will be entered; If the superheat difference is less than the preset difference, the second level mode is entered; In the second level mode, it is determined whether the current air conditioner is in the preset mode. If not, it enters the third level mode; if yes, it enters the fourth level mode; In the third level mode, it is determined whether the third adjustment member and the fourth adjustment member are turned on, if not, the fifth level mode is entered; If so, enter the sixth level two mode.

Images