Air conditioner

Abstract

The invention provides an air conditioner which comprises an air conditioner indoor unit which comprises an indoor heat exchanger. The air conditioner outdoor unit comprises an outdoor heat exchanger; the compressor comprises an air suction port, an air exhaust port and a compression cavity communicated with the air suction port and the air exhaust port; the throttling device is connected between the indoor heat exchanger and the outdoor heat exchanger and is used for throttling the high-temperature and high-pressure refrigerant liquid subjected to the condensation process into low-pressure refrigerant liquid; the controller is configured to detect the running frequency of the compressor, and when it is detected that the running frequency of the compressor continuously runs within a first frequency range for not less than first preset time, the exhaust temperature Tp of the compressor, the outdoor coil temperature Touter coil of the outdoor heat exchanger and the outdoor environment temperature Tout are detected; and when Tp < = Touter disc + delta Tp and Touter disc < = Tout + delta Touter disc, the oil return time of the compressor is controlled to be shortened, delta Tp is the preset value-added value of the exhaust temperature, delta Touter disc is the preset value-added value of the outdoor coil pipe temperature, and therefore noise generated by the compressor is reduced.

Description

Technical Field

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

[0002] Air conditioners are widely used to regulate indoor temperatures. They consist of an indoor unit and an outdoor unit. The indoor unit is typically located indoors and exchanges heat with the indoor air. The outdoor unit, located outdoors, exchanges heat from the refrigerant with the outdoor air.

[0003] During the operation of the air conditioner, as the room load decreases, the operating frequency of the compressor will gradually decrease. When the operating frequency of the compressor is reduced to a certain range, due to the reduction in load, the pressure difference between the suction and exhaust gases and the spring force are insufficient to balance the reciprocating inertia force of the slide and the friction between the slide grooves during the operation of the compressor, resulting in the end of the slide not being able to always maintain contact with the outer surface of the rolling rotor. At a certain rotation angle, the end of the slide separates from the outer surface of the rolling rotor, and an impact noise occurs when they contact again.

[0004] The frequency of the noise caused by the vane tip colliding with the outer surface of the rolling rotor is mainly concentrated in the range of 2000-7000 Hz. This high-frequency noise is very different from the low-frequency noise of the compressor. When the user opens the window, it will produce a harsh noise, affecting the user experience. Summary of the Invention

[0005] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0006] To this end, according to an embodiment of the present disclosure, an air conditioner is proposed, comprising:

[0007] an air conditioner indoor unit, comprising an indoor heat exchanger;

[0008] An air-conditioning outdoor unit is provided in an outdoor space, and comprises:

[0009] outdoor heat exchanger;

[0010] a compressor, the compressor comprising an air intake port, an air discharge port, and a compression chamber communicating with the air intake port and the air discharge port, wherein refrigerant entering the compression chamber from the air intake port is compressed by the compressor and then discharged from the air discharge port;

[0011] a throttling device connected between the indoor heat exchanger and the outdoor heat exchanger to throttle the high-temperature and high-pressure refrigerant liquid after the condensation process to a low-pressure refrigerant liquid;

[0012] The controller is configured to: detect the operating frequency of the compressor, and when it is detected that the operating frequency of the compressor continues to operate within a first frequency range for not less than a first preset time, detect the exhaust temperature T of the compressor p , the outdoor coil temperature T of the outdoor heat exchanger 外盘 and outdoor ambient temperature T out ;

[0013] When T is satisfied p ≤T 外盘 +ΔT p , T 外盘 ≤T out +ΔT 外盘 When , the oil return time of the compressor is shortened, wherein ΔT p Preset increment for exhaust temperature, ΔT 外盘 Preset increment for outdoor coil temperature.

[0014] This application shortens the oil return period of the compressor, thereby shortening the time the air conditioner operates at a low frequency within the first frequency range, thereby eliminating the clicking noise produced by the compressor operating at a low frequency. Because the clicking noise only occurs when the air conditioner operates at a low frequency and stably for a certain period of time, shortening the oil return time can reduce the period of stable low-frequency operation of the compressor, thereby eliminating the clicking noise of the compressor to a certain extent.

[0015] The present application also provides an air conditioner, comprising:

[0016] an air conditioner indoor unit, comprising an indoor heat exchanger;

[0017] An air-conditioning outdoor unit is provided in an outdoor space, and comprises:

[0018] outdoor heat exchanger;

[0019] an outdoor fan, which is used to drive outdoor air to flow through the outdoor heat exchanger and then to the outdoors;

[0020] a compressor, the compressor comprising an air intake port, an air discharge port, and a compression chamber communicating with the air intake port and the air discharge port, wherein refrigerant entering the compression chamber from the air intake port is compressed by the compressor and then discharged from the air discharge port;

[0021] a throttling device connected between the indoor heat exchanger and the outdoor heat exchanger to throttle the high-temperature and high-pressure refrigerant liquid after the condensation process to a low-pressure refrigerant liquid;

[0022] The controller is configured to: detect the operating frequency of the compressor, and when it is detected that the operating frequency of the compressor continues to operate within a first frequency range for not less than a first preset time, detect the exhaust temperature T of the compressorp , the outdoor coil temperature T of the outdoor heat exchanger 外盘 and outdoor ambient temperature T out ;

[0023] When T is satisfied p ≤T 外盘 +ΔT p , T 外盘 ≤T out +ΔT 外盘 When the outdoor fan speed is increased, the oil return time of the compressor is shortened, wherein ΔT p Preset increment for exhaust temperature, ΔT 外盘 Preset increment for outdoor coil temperature.

[0024] In some embodiments of the present application, the controller is configured to:

[0025] When it is detected that the operating frequency of the compressor continues to operate within the first frequency range for not less than a first preset time, the operating frequency of the compressor is controlled to be increased.

[0026] In some embodiments of the present application, the controller is configured to:

[0027] When it is detected that the operating frequency of the compressor continues to operate within the first frequency range for not less than a first preset time, the operating frequency of the compressor is controlled to be a preset oil return frequency, and the preset oil return frequency is greater than an upper limit value of the first frequency range.

[0028] In some embodiments of the present application, the controller is configured to:

[0029] When it is detected that the operating frequency of the compressor continues to operate within the first frequency range for not less than a first preset time, the compressor is controlled to operate at the preset oil return frequency for a second preset time, and then the operating frequency of the compressor is reduced.

[0030] In some embodiments of the present application, the controller is configured to:

[0031] When it is detected that the operating frequency of the compressor continues to run within the first frequency range for not less than a first preset time, the compressor is controlled to run at the preset oil return frequency for a second preset time, and then the operating frequency of the compressor is controlled to run within the first frequency range.

[0032] In some embodiments of the present application, the lower limit value of the first frequency range is not lower than 10 Hz, and the upper limit value of the first frequency range is not higher than 20 Hz.

[0033] In some embodiments of the present application, the preset increase in exhaust temperature is less than 10°C.

[0034] In some embodiments of the present application, the opening degree of the throttling refrigerant of the throttling device is fixed.

[0035] In some embodiments of the present application, the preset increment of the outdoor coil temperature is less than 3°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 This is the control process of the low-frequency operation of the air conditioner according to the embodiment of the present application Figure 1 ;

[0038] Figure 2 This is the control process of the low-frequency operation of the air conditioner according to the embodiment of the present application Figure 2 ;

[0039] Figure 3 This is the control process of the low-frequency operation of the air conditioner according to the embodiment of the present application Figure 3 ;

[0040] Figure 4 This is the control process of the low-frequency operation of the air conditioner according to the embodiment of the present application Figure 4 ;

[0041] Figure 5 This is the control process of the low-frequency operation of the air conditioner according to the embodiment of the present application Figure 5 ;

[0042] Figure 6 This is the control process of the low-frequency operation of the air conditioner according to the embodiment of the present application Figure 6 ;

[0043] Figure 7 This is the control process of the low-frequency operation of the air conditioner according to the embodiment of the present application Figure 7 ;

[0044] Figure 8 This is the control process of the low-frequency operation of the air conditioner according to the embodiment of the present application Figure 8 ;

[0045] Figure 9 This is the control process of the low-frequency operation of the air conditioner according to the embodiment of the present application Figure 9 ;

[0046] Figure 10This is the control process of the low-frequency operation of the air conditioner according to the embodiment of the present application Figure 10 . DETAILED DESCRIPTION

[0047] The present invention is described in detail below by way of exemplary embodiments, but it should be understood that elements, structures, and features of one embodiment may be beneficially combined in other embodiments without further description.

[0048] This embodiment provides an air conditioner, see Figures 1-10 The air conditioner may include an indoor air conditioner unit and an outdoor air conditioner unit. The indoor air conditioner unit is installed in the indoor space. The outdoor air conditioner unit is installed in the outdoor space for heat exchange with the outdoor environment.

[0049] The air conditioner indoor unit comprises a casing, which is arranged in an outdoor space. A first cavity is arranged in the casing, and a heat exchange air inlet is arranged on the casing, which is communicated with the indoor space.

[0050] The casing is provided with a heat exchange air outlet, the heat exchange air outlet is connected to the indoor space, and the heat exchange air inlet and the heat exchange air outlet are connected to the first cavity.

[0051] The air conditioner outdoor unit may include an indoor heat exchanger. A refrigerant circulates in the indoor heat exchanger. The refrigerant can be used to exchange heat with the air entering the first cavity and flowing through the indoor heat exchanger.

[0052] In some embodiments, the housing has a top and a bottom, with the height of the housing extending from the bottom to the top. The housing also has a width, with the width extending from one side of the housing to the other side. The housing has a front and a rear facing oppositely disposed sides, with the front, rear, left, and right sides of the housing being circumferential sides of the housing.

[0053] In some embodiments, an air conditioner outdoor unit is disposed in an outdoor space, the air conditioner outdoor unit comprising a housing, a second cavity disposed within the housing, and an outdoor air inlet and an outdoor air outlet disposed on the housing. The outdoor air inlet communicates with the outdoor space and the second cavity, and the outdoor air outlet communicates with the outdoor space and the second cavity.

[0054] In some embodiments, an outdoor heat exchanger is provided in the shell, and refrigerant flows in the outdoor heat exchanger. The refrigerant in the outdoor heat exchanger can be used to exchange heat with the air entering the second cavity and flowing through the outdoor heat exchanger.

[0055] In some embodiments, a compressor is disposed in the housing, the compressor is disposed in the second cavity, and the compressor is installed at the bottom of the air conditioner outdoor unit.

[0056] The compressor includes an air intake port, an air discharge port, and a compression chamber connected to the air intake port and the air discharge port. The refrigerant entering the compression chamber from the air intake port is compressed by the compressor and then discharged from the air discharge port. The compressor is used to provide power for the flow of refrigerant in the vapor compression cycle.

[0057] The throttling device is connected between the indoor heat exchanger and the outdoor heat exchanger. After the refrigerant flows out of the condenser, it enters the throttling device for expansion. The electronic expansion valve throttles the high-temperature and high-pressure refrigerant liquid after the condensation process into a low-pressure refrigerant liquid, and the low-pressure refrigerant liquid then flows to the indoor heat exchanger.

[0058] The four-way valve is connected to the indoor heat exchanger, the outdoor heat exchanger and the compressor, and is used to switch the air conditioner between cooling and heating conditions.

[0059] The indoor heat exchanger, the outdoor heat exchanger, the compressor, the four-way valve and the throttling device are connected through pipelines. The pipelines include online pipes connected between the indoor heat exchanger and the outdoor heat exchanger.

[0060] The outdoor fan is arranged in the outdoor unit of the air conditioner, and is used to drive the outdoor air to flow through the outdoor heat exchanger and then flow to the outdoors.

[0061] An air conditioner performs a cooling or heating cycle through a compressor, condenser, throttling device, and evaporator. These cycles involve compression, condensation, expansion, and evaporation. The refrigerant absorbs and releases heat to cool or heat the room, regulating the temperature.

[0062] The compressor compresses the refrigerant gas to a high-temperature, high-pressure state and discharges the compressed refrigerant gas, which then flows into the condenser. The condenser condenses the compressed, high-temperature, high-pressure gaseous refrigerant into liquid refrigerant, releasing heat into the surrounding environment through the condensation process.

[0063] The liquid refrigerant flowing out of the condenser enters the throttling device, which expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The low-pressure liquid refrigerant flowing out of the throttling device enters the evaporator. As it passes through the evaporator, it absorbs heat and evaporates into a low-temperature, low-pressure refrigerant gas. This low-temperature, low-pressure refrigerant gas returns to the compressor. The evaporator achieves a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material being cooled. Throughout this cycle, the air conditioner regulates the temperature of the indoor space.

[0064] In some embodiments, the air conditioner includes an exhaust temperature sensor, which is disposed on a pipeline connected to the exhaust port and is used to detect the exhaust temperature of the compressor.

[0065] In some embodiments, the air conditioner includes an outdoor coil temperature sensor, which is disposed on the refrigerant coil of the air conditioner outdoor unit and is used to detect the outdoor coil temperature of the outdoor heat exchanger.

[0066] In some embodiments, the outdoor coil temperature sensor is disposed on one of the condensing coils in the middle of the outdoor heat exchanger, and the temperature of one of the condensing coils in the middle of the outdoor heat exchanger is defined as the outdoor coil temperature of the outdoor heat exchanger.

[0067] In some embodiments, the air conditioner includes an outdoor ambient temperature sensor, which is disposed on an outdoor unit of the air conditioner and is configured to detect the outdoor ambient temperature.

[0068] The air conditioner further comprises a controller, and the exhaust temperature sensor, the outdoor coil temperature sensor and the outdoor ambient temperature sensor are all electrically connected to the controller.

[0069] The exhaust temperature sensor detects the exhaust temperature of the compressor and uploads it to the controller in the form of an electrical signal. The outdoor coil temperature sensor detects the outdoor coil temperature of the outdoor heat exchanger and uploads it to the controller in the form of an electrical signal. The outdoor ambient temperature sensor detects the outdoor ambient temperature and uploads it to the controller in the form of an electrical signal.

[0070] During the operation of the air conditioner, as the room load decreases, the operating frequency of the compressor will gradually decrease. When the operating frequency of the compressor is reduced to a certain range, due to the reduction in load, the pressure difference between the suction and exhaust gases and the spring force are insufficient to balance the reciprocating inertia force of the compressor's vanes and the friction between the vane grooves. As a result, the vane end cannot always maintain contact with the outer surface of the rolling rotor. At a certain rotation angle, the vane end separates from the outer surface of the rolling rotor, and an impact noise occurs when they contact again.

[0071] In some embodiments, the controller is configured to detect the operating frequency of the compressor, and when it is detected that the operating frequency of the compressor continues to operate within the first frequency range for not less than a first preset time, the exhaust temperature T of the compressor is detected. p , the outdoor coil temperature of the outdoor heat exchanger T 外盘 and outdoor ambient temperature T out .

[0072] When T is satisfied p ≤T 外盘 +ΔT pWhen the compressor discharge temperature is close to the outdoor coil temperature, and the compressor bottom temperature is close to the outdoor coil temperature, it can be seen that the air conditioner's pressure superheat is insufficient at this time, and the air conditioner has a serious compressor liquid backflow problem. Pressure superheat is the difference between the temperature at the bottom of the compressor housing and the condensing temperature.

[0073] When T is satisfied 外盘 ≤T out +ΔT 外盘 When , it means that the outdoor coil temperature is close to the outdoor ambient temperature, and the air conditioning system load is low.

[0074] When T is satisfied p ≤T 外盘 +ΔT p , T 外盘 ≤T out +ΔT 外盘 This means that the air conditioner's operating load is low, the intake and exhaust pressure difference is low, and the intake and exhaust pressure difference and the spring force are not enough to balance the reciprocating inertia force of the sliding vane and the friction between the sliding vane slots, which will produce a clicking sound when the sliding vane and the rolling rotor periodically disengage and return to contact.

[0075] For air conditioners whose throttling device opening cannot be adjusted, the pressure difference before and after throttling cannot be adjusted by adjusting the opening, and the intake and exhaust pressure difference cannot be increased.

[0076] In some embodiments, when T p ≤T 外盘 +ΔT p , T 外盘 ≤T out +ΔT 外盘 When the oil return time of the compressor is shortened, ΔT p Preset increment for exhaust temperature, ΔT 外盘 Preset increment for outdoor coil temperature.

[0077] Shortening the oil return period of the compressor reduces the time the air conditioner spends operating at a low frequency within the first frequency range, thereby eliminating the clicking noise produced by the compressor's low-frequency operation. Because the clicking noise only occurs when the air conditioner maintains stable low-frequency operation for a certain period of time, shortening the oil return period can reduce the period of stable low-frequency operation of the compressor, thereby eliminating the clicking noise to a certain extent.

[0078] The rattling noise is caused by the impact of the vane tips on the outer surface of the rolling rotor in the compressor, with a frequency of 2000-7000 Hz. This higher frequency noise is significantly different from the low-frequency noise of the compressor. Therefore, when the user opens the window, the grating noise is generated, affecting the user experience.

[0079] In some embodiments, when T p ≤T 外盘 +ΔT p , T 外盘 ≤T out +ΔT 外盘 This means that the air conditioner's operating load is low, the intake and exhaust pressure difference is low, and the intake and exhaust pressure difference and the spring force are not enough to balance the reciprocating inertia force of the sliding vane and the friction between the sliding vane slots, which will produce a clicking sound when the sliding vane and the rolling rotor periodically disengage and return to contact.

[0080] The controller increases the speed of the outdoor fan to satisfy N=N 目标 +ΔN, where N is the actual value of the outdoor fan speed, N 目标 is the current target speed of the outdoor fan, and ΔN is the increment of the outdoor fan speed. By increasing the speed of the outdoor fan, the noise generated by the outdoor fan is increased, thereby to a certain extent covering the clicking sound generated by the collision between the sliding vane and the rolling rotor through the sound of the wind, and playing the effect of reducing the clicking sound generated by the low-frequency operation of the compressor.

[0081] At the same time, the controller shortens the oil return period of the compressor, reducing the time the air conditioner spends operating at a low frequency within the first frequency range, thereby eliminating the clicking noise produced by the compressor's low-frequency operation. Because the clicking noise only occurs when the air conditioner has been operating stably at a low frequency for a certain period of time, shortening the oil return period can reduce the period of stable low-frequency operation of the compressor, thereby eliminating the clicking noise to a certain extent.

[0082] By increasing the speed of the outdoor fan and shortening the oil return period of the compressor, the rattling sound caused by the separation of the sliding vane and the rolling rotor can be effectively masked and weakened, thereby improving the user experience.

[0083] In some embodiments, the controller is configured to control the operating frequency of the compressor to increase when it is detected that the operating frequency of the compressor continues to operate within the first frequency range for not less than a first preset time.

[0084] The increase in the frequency of the compressor can ensure the oil return of the compressor, allowing the oil in the air conditioner's heat exchange system to return to the compressor to lubricate the compressor and ensure the reliability of the compressor.

[0085] In some embodiments, the controller is configured to: when it is detected that the operating frequency of the compressor continues to run within the first frequency range for not less than a first preset time, control the operating frequency of the compressor to a preset oil return frequency, and the preset oil return frequency is greater than the upper limit value of the first frequency range.

[0086] A preset oil return frequency is set in the compressor. When it is detected that the compressor continues to operate at a low frequency within the first frequency range for not less than a first preset time, the operating frequency of the compressor is controlled to be adjusted to the preset oil return frequency. The preset oil return frequency is greater than the upper limit value of the first frequency range, which can increase the frequency of the compressor, thereby ensuring the oil return of the compressor, allowing the oil in the heat exchange system of the air conditioner to return to the compressor to lubricate the compressor and ensure the reliability of the compressor.

[0087] In some embodiments, the controller is configured to: when it is detected that the operating frequency of the compressor continues to run within the first frequency range for not less than a first preset time, control the compressor to run at a preset oil return frequency for a second preset time, and then reduce the operating frequency of the compressor.

[0088] The compressor's operating frequency is controlled to a preset oil return frequency, ensuring oil return from the air conditioner's heat exchange system to the compressor for lubrication and reliability. After the compressor runs at the preset oil return frequency for a second preset time, the operating frequency is reduced to save energy and prevent persistently high energy consumption.

[0089] In some embodiments, the controller is configured to: when it is detected that the operating frequency of the compressor continues to run within the first frequency range for not less than a first preset time, control the compressor to run at a preset oil return frequency for a second preset time, and then control the operating frequency of the compressor to run within the first frequency range.

[0090] The compressor's operating frequency is controlled to adjust to a preset oil return frequency, ensuring oil return from the air conditioner's heat exchange system to the compressor for lubrication and reliability. After the compressor operates at the preset oil return frequency for a second preset time, the compressor's operating frequency is controlled to operate within the first frequency range to save energy and prevent persistently high energy consumption.

[0091] In some embodiments, the lower limit value of the first frequency range is not less than 10 Hz. If the lower limit value of the first frequency range is too low, the operating frequency of the compressor cannot reach a too low operating frequency. Therefore, the lower limit value of the first frequency range can be set to not less than 5 Hz, or the lower limit value of the first frequency range can be set to not less than 8 Hz, or the lower limit value of the first frequency range can be set to not less than 10 Hz.

[0092] In some embodiments, the upper limit value of the first frequency range is not higher than 20 Hz, because the generation of the clicking sound requires the air conditioner to run stably at a low frequency for a certain period of time. If the upper limit value of the first frequency range is too high, it will increase the system's misjudgment that the compressor is running at a low frequency and generating the clicking sound. Therefore, the upper limit value of the first frequency range is not higher than 18 Hz, or the upper limit value of the first frequency range is not higher than 20 Hz, or the upper limit value of the first frequency range is not higher than 25 Hz.

[0093] In some embodiments, the preset increment of the exhaust temperature is less than 10°C. If the preset increment of the exhaust temperature is too large, the exhaust temperature T p The outdoor coil temperature of the outdoor heat exchanger is T 外盘 The difference is too large, which results in the exhaust temperature T being unable to pass through the compressor. p The outdoor coil temperature of the outdoor heat exchanger is T 外盘 The difference between the values ​​of 0 and 1 can be used to determine whether there is a serious compressor liquid return problem. Therefore, the preset value of the exhaust temperature should not be set too large. It can be set to the preset value of the exhaust temperature <5°C, or the preset value of the exhaust temperature <8°C, or the preset value of the exhaust temperature <10°C.

[0094] In some embodiments, the preset increment of the outdoor coil temperature is less than 3°C. Excessive increments can result in a significant difference between the outdoor coil temperature and the outdoor ambient temperature. This excessive difference can overload the air conditioning system and make it impossible to determine whether the compressor is operating at low frequency. Therefore, the preset increment of the outdoor coil temperature should not be too large. Examples include the preset increment of the outdoor coil temperature less than 3°C, the preset increment of the outdoor coil temperature less than 4°C, and the preset increment of the outdoor coil temperature less than 5°C.

[0095] In some embodiments, the first preset time is ≥ 25 minutes, because the generation of the clicking sound requires the air conditioner's compressor to run stably at a low frequency for a certain period of time. If the first preset time is too short, the air conditioner's clicking sound will not be generated, making it impossible to correctly judge whether the air conditioner has generated the clicking sound at this time. Therefore, the first preset time should not be too short. It can be set that the first preset time is ≥ 15 minutes, or the first preset time is ≥ 20 minutes, or the first preset time is ≥ 25 minutes.

[0096] In some embodiments, the first preset time is ≤35 minutes. This is because when the air conditioner runs at a low frequency for a long time, the sliding vane and the rolling rotor periodically disengage and return to contact, resulting in a clicking sound. Over time, this will accelerate the consumption of the compressor's service life. Therefore, the first preset time needs to be reasonably selected. Therefore, it can be set to the first preset time ≤30 minutes, or the first preset time ≤35 minutes, or the first preset time ≤40 minutes.

[0097] In some embodiments, in some embodiments, the first preset time is the oil return time of the compressor. The controller controls the time period of the oil return of the compressor to be shortened, so that the time for the air conditioner to run at a low frequency within the first frequency range is shortened, thereby eliminating the clicking sound generated by the low-frequency operation of the compressor.

[0098] In some embodiments, the controller can be used to control the compressor to eliminate the clicking noise generated by the operation in both the refrigeration cycle and the heating cycle.

[0099] In the description of the present invention, it should 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" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0100] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0101] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

[0102] In the present invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first," "second," or "third" may explicitly or implicitly include one or more of such features.

[0103] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it 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 intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0104] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" 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 expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0105] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An air conditioner, characterized in that: include: an air conditioner indoor unit, comprising an indoor heat exchanger; An air-conditioning outdoor unit is provided in an outdoor space, and comprises: outdoor heat exchanger; a compressor, the compressor comprising an air intake port, an air discharge port, and a compression chamber communicating with the air intake port and the air discharge port, wherein refrigerant entering the compression chamber from the air intake port is compressed by the compressor and then discharged from the air discharge port; a throttling device connected between the indoor heat exchanger and the outdoor heat exchanger to throttle the high-temperature and high-pressure refrigerant liquid after the condensation process to a low-pressure refrigerant liquid; The controller is configured to: detect the operating frequency of the compressor, and when it is detected that the operating frequency of the compressor continues to operate within a first frequency range for not less than a first preset time, detect the exhaust temperature T of the compressor p , the outdoor coil temperature T of the outdoor heat exchanger 外盘 and outdoor ambient temperature T out ; When T is satisfied p ≤T 外盘 +ΔT p , T 外盘 ≤T out +ΔT 外盘 When , the oil return time of the compressor is shortened, wherein ΔT p Preset increment for exhaust temperature, ΔT 外盘 Preset increment for outdoor coil temperature.

2. An air conditioner, characterized in that: include: an air conditioner indoor unit, comprising an indoor heat exchanger; An air-conditioning outdoor unit is provided in an outdoor space, and comprises: outdoor heat exchanger; an outdoor fan, which is used to drive outdoor air to flow through the outdoor heat exchanger and then to the outdoors; a compressor, the compressor comprising an air intake port, an air discharge port, and a compression chamber communicating with the air intake port and the air discharge port, wherein refrigerant entering the compression chamber from the air intake port is compressed by the compressor and then discharged from the air discharge port; a throttling device connected between the indoor heat exchanger and the outdoor heat exchanger to throttle the high-temperature and high-pressure refrigerant liquid after the condensation process to a low-pressure refrigerant liquid; The controller is configured to: detect the operating frequency of the compressor, and when it is detected that the operating frequency of the compressor continues to operate within a first frequency range for not less than a first preset time, detect the exhaust temperature T of the compressor p , the outdoor coil temperature T of the outdoor heat exchanger 外盘 and outdoor ambient temperature T out ; When T is satisfied p ≤T 外盘 +ΔT p , T 外盘 ≤T out +ΔT 外盘 When the outdoor fan speed is increased, the oil return time of the compressor is shortened, wherein ΔT p Preset increment for exhaust temperature, ΔT 外盘 Preset increment for outdoor coil temperature.

3. The air conditioner according to claim 1 or 2, characterized in that: The controller is configured as: When it is detected that the operating frequency of the compressor continues to operate within the first frequency range for not less than a first preset time, the operating frequency of the compressor is controlled to be increased.

4. The air conditioner according to claim 1 or 2, characterized in that: The controller is configured as: When it is detected that the operating frequency of the compressor continues to operate within the first frequency range for not less than a first preset time, the operating frequency of the compressor is controlled to be a preset oil return frequency, and the preset oil return frequency is greater than an upper limit value of the first frequency range.

5. The air conditioner according to claim 4, characterized in that The controller is configured as: When it is detected that the operating frequency of the compressor continues to operate within the first frequency range for not less than a first preset time, the compressor is controlled to operate at the preset oil return frequency for a second preset time, and then the operating frequency of the compressor is reduced.

6. The air conditioner according to claim 4, characterized in that The controller is configured as: When it is detected that the operating frequency of the compressor continues to run within the first frequency range for not less than a first preset time, the compressor is controlled to run at the preset oil return frequency for a second preset time, and then the operating frequency of the compressor is controlled to run within the first frequency range.

7. The air conditioner according to claim 1 or 2, characterized in that: The lower limit value of the first frequency range is not less than 10 Hz, and the upper limit value of the first frequency range is not more than 20 Hz.

8. The air conditioner according to claim 1 or 2, characterized in that: The exhaust temperature is preset to increase by <10℃.

9. The air conditioner according to claim 1 or 2, characterized in that: The opening degree of the throttling refrigerant of the throttling device is fixed.

10. The air conditioner according to claim 1 or 2, characterized in that: The outdoor coil temperature is preset to increase by less than 3°C.

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