Air Conditioner

Abstract

The invention relates to an air conditioner, belonging 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, a compressor, a first connecting pipe, a second connecting pipe, a first temperature sensor, a second temperature sensor and a controller; wherein, the indoor heat exchanger is arranged inside the indoor unit; the outdoor heat exchanger is arranged inside the outdoor unit; the compressor is arranged inside the outdoor unit; the first connecting pipe connects the compressor with the indoor heat exchanger; the second connecting pipe connects the outdoor heat exchanger with the indoor heat exchanger; the second connecting pipe is attached to the outer peripheral wall of the first connecting pipe or the second connecting pipe part is located inside the first connecting pipe; the controller is configured as follows: the first temperature sensor detects the first temperature, the second temperature sensor detects the second temperature, the temperature difference between the second temperature and the first temperature is judged, when the temperature difference is greater than a first preset value, the adjustment gear of the adjustment member is increased; when the temperature difference is less than the second preset value, the adjustment gear of the adjustment member is reduced.

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 conditioning 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. Fresh air air conditioning is a healthy and comfortable air conditioning with fresh air function. It uses a fan to achieve the circulation and ventilation between room air and outdoor air, and also has the function of purifying the air.

[0003] The air conditioner includes a compressor, an outdoor heat exchanger and an indoor heat exchanger. In the cooling mode, the refrigerant absorbs heat in the indoor heat exchanger and dissipates heat through the outdoor heat exchanger to realize the refrigeration cycle. In the prior art, in order to increase the cooling capacity of the air conditioner, the number of heat dissipation fins or heat dissipation pipes in the outdoor heat exchanger is usually increased, but this method increases the cost of the air conditioner. 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, in which, when the air conditioner is in cooling mode, low-temperature refrigerant flows in the first connecting pipe and high-temperature refrigerant flows in the second connecting pipe, so that the temperature of the second connecting pipe is higher than that of the first connecting pipe; the contact between the first connecting pipe and the second connecting pipe is achieved to reduce the temperature of the refrigerant inside the second connecting pipe, and further reduce the temperature of the second connecting pipe entering the indoor heat exchanger, thereby increasing the cooling capacity; and through the control of the controller, the heat exchange effect is guaranteed and the compressor shutdown is avoided.

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

[0007] The indoor unit is hollow;

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

[0009] The outdoor unit is hollow;

[0010] An outdoor heat exchanger is disposed inside the outdoor unit; a refrigerant circulates between the indoor heat exchanger and the outdoor heat exchanger;

[0011] A compressor is disposed in the outdoor unit, and is used to compress the refrigerant and output it to the outdoor heat exchanger and the indoor heat exchanger;

[0012] A first connecting pipe, which connects the compressor with the indoor heat exchanger; a refrigerant flows between the indoor heat exchanger and the compressor through the first connecting pipe;

[0013] a second connecting pipe, which connects the outdoor heat exchanger with the indoor heat exchanger; the refrigerant flows between the indoor heat exchanger and the outdoor heat exchanger through the second connecting pipe; the second connecting pipe is attached to the outer peripheral wall of the first connecting pipe, or the second connecting pipe is partially located inside the first connecting pipe;

[0014] A first temperature sensor is disposed at one end of the second connecting pipe close to the outdoor heat exchanger;

[0015] A second temperature sensor is disposed at one end of the second connecting pipe close to the indoor heat exchanger;

[0016] A regulating member, which is arranged at one end of the second connecting pipe close to the indoor heat exchanger, and is used to regulate the flow rate of the refrigerant in the first connecting pipe. The regulating member has a plurality of regulating gears, and the higher the regulating gear, the greater the flow rate of the refrigerant in the first connecting pipe;

[0017] The controller is configured as follows: the first temperature sensor detects a first temperature, the second temperature sensor detects a second temperature, determines the temperature difference between the second temperature and the first temperature, and when the temperature difference is greater than a first preset value, increases the adjustment gear of the adjustment member; when the temperature difference is less than the second preset value, decreases the adjustment gear of the adjustment member.

[0018] In the technical solution, when the air conditioner is in cooling mode, low-temperature refrigerant flows in the first connecting pipe and high-temperature refrigerant flows in the second connecting pipe, so the temperature of the second connecting pipe is higher than that of the first connecting pipe; the contact between the first connecting pipe and the second connecting pipe is used to reduce the temperature of the refrigerant inside the second connecting pipe, and further reduce the temperature of the second connecting pipe entering the indoor heat exchanger, thereby increasing the cooling capacity; and through the control of the controller, the heat exchange effect is guaranteed and the compressor shutdown is avoided.

[0019] Some embodiments of the present application further include an outdoor fan, which is disposed in the outdoor unit and is used to blow air through the outdoor heat exchanger;

[0020] When the temperature difference is greater than a first preset value and the adjustment gear of the adjustment member is at the highest level, the rotation speed of the outdoor fan is increased.

[0021] In some embodiments of the present application, when the temperature difference is less than the second preset value and the adjustment gear of the adjustment member is at the lowest level, the rotation speed of the outdoor fan is reduced.

[0022] In some embodiments of the present application, the first preset value is the set value plus the first change amount, and the second preset value is the set value minus the second change amount.

[0023] In some embodiments of the present application, an outdoor temperature sensor is provided on the outdoor unit, and the outdoor temperature sensor is used to detect the outdoor temperature. If the current outdoor temperature is higher, the value of the set value is higher.

[0024] In some embodiments of the present application, the first change amount and the second change amount have the same value.

[0025] In some embodiments of the present application, a cooling fan is further provided inside the outdoor unit, and the cooling fan is used to dissipate heat for the compressor; when the temperature difference between the first temperature and the second temperature is greater than a first preset value, and the adjustment gear of the adjustment member is at the highest position, and the speed of the outdoor fan reaches the highest, the cooling fan is started to cool the compressor

[0026] In some embodiments of the present application, the second connecting pipe includes a heat exchange section and a connecting section connected to each other, the heat exchange section is partially or completely wrapped around the first connecting pipe, and the inner diameter of the heat exchange section is smaller than the inner diameter of the connecting section.

[0027] In some embodiments of the present application, the heat exchange section is spirally wound around the outer peripheral wall of the first connecting pipe.

[0028] In some embodiments of the present application, the inner diameter of the heat exchange section is smaller than the inner diameter of the first connecting pipe; the outer diameter of the heat exchange section is smaller than the outer diameter of the first connecting pipe.

[0029] In some embodiments of the present application, an output pipe, a four-way valve, a third connecting pipe and a fourth connecting pipe are further included; the four-way valve includes an input port, a first output port, a second output port and a third output port; the output pipe connects the compressor with the input port; the first connecting pipe connects the compressor with the first output port; the third connecting pipe connects the indoor heat exchanger with the second output port; the fourth connecting pipe connects the outdoor heat exchanger with the third output port;

[0030] The four-way valve is used to connect the input port with the third output port, and the first output port with the second output port; or, the input port with the second output port, and the first output port with the third output port.

[0031] 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

[0032] Figure 1 is a schematic diagram of the overall structure of an air conditioner according to an embodiment of the present application;

[0033] Figure 2is a schematic diagram of the overall structure of an air conditioner according to an embodiment of the present application;

[0034] Figure 3 is a schematic diagram of the overall structure of an air conditioner according to an embodiment of the present application;

[0035] Figure 4 is a structural schematic diagram of an air conditioner according to an embodiment of the present application;

[0036] Figure 5 is a working flow chart of an air conditioner according to an embodiment of the present application;

[0037] Figure 6 is a working flow chart of an air conditioner according to an embodiment of the present application;

[0038] Figure 7 is a graph showing changes in the set value of the air conditioner according to an embodiment of the present application as a function of the outdoor temperature;

[0039] Figure 8 is a schematic structural diagram of a heat exchange section of an air conditioner according to an embodiment of the present application;

[0040] Fig. 9 is a schematic structural diagram of a heat exchange section of an air conditioner according to an embodiment of the present application;

[0041] Fig.10 is a schematic structural diagram of a heat exchange section of an air conditioner according to an embodiment of the present application;

[0042] Fig.11 is a schematic structural diagram of a heat exchange section of an air conditioner according to an embodiment of the present application;

[0043] Fig.12 It is a cross-sectional view of a heat exchange section of an air conditioner according to an embodiment of the present application.

[0044] In the above figures: 100, outdoor unit; 200, outdoor heat exchanger; 300, indoor unit; 400, indoor heat exchanger; 500, compressor; 600, first connecting pipe; 700, second connecting pipe; 701, heat exchange section; 702, connecting section; 800, output pipe; 900, four-way valve; 901, input port; 902, first output port; 903, second output port; 904, third output port; 110, third connecting pipe; 120, fourth connecting pipe; 130, first stop valve; 140, second stop valve; 150, first temperature sensor; 160, second temperature sensor; 170, adjusting member; 180, set value; 190, first preset value; 210, second preset value. DETAILED DESCRIPTION

[0045] 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 indicate positions or positional relationships based on the positions 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.

[0046] In the present invention, unless otherwise clearly specified 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.

[0047] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "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" or "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.

[0048] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", 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.

[0049] 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.

[0050] In the present application, the air conditioner performs a refrigeration cycle of the indoor unit of the air conditioner by using a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger. When working, the outdoor heat exchanger is used as a condenser. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant 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 expands the liquid phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid phase refrigerant. The indoor heat exchanger evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The indoor heat exchanger 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 indoor unit refers to the part of the refrigeration cycle including the compressor and the outdoor heat exchanger, the indoor unit of the air conditioner indoor unit 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 function as a condenser or an indoor heat exchanger. When the indoor heat exchanger functions as a condenser, the air conditioner indoor unit functions as a heater in the heating mode, and when the indoor heat exchanger functions as an indoor heat exchanger, the air conditioner indoor unit functions as a cooler in the cooling mode.

[0051] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0052] As attached Figures 1 to 5As shown, in an exemplary embodiment of the air conditioner of the present invention, the air conditioner includes: an indoor unit 300, an indoor heat exchanger 400, an outdoor unit 100, an outdoor heat exchanger 200, a compressor 500, a first connecting pipe 600, a second connecting pipe 700, a first temperature sensor 150, a second temperature sensor 160 and a controller; wherein the indoor unit 300 is hollow; the indoor heat exchanger 400 is arranged inside the indoor unit 300; the outdoor unit 100 is hollow; the outdoor heat exchanger 200 is arranged inside the outdoor unit 100 The refrigerant circulates between the indoor heat exchanger 400 and the outdoor heat exchanger 200; the compressor 500 is disposed in the outdoor unit 100, and the compressor 500 is used to compress the refrigerant and output it to the outdoor heat exchanger 200 and the indoor heat exchanger 400; the first connecting pipe 600 connects the compressor 500 with the indoor heat exchanger 400; the refrigerant flows between the indoor heat exchanger 400 and the compressor 500 through the first connecting pipe 600; the second connecting pipe 700 connects the outdoor heat exchanger 200 with the indoor heat exchanger 400; the refrigerant flows between the indoor heat exchanger 400 and the compressor 500 through the second connecting pipe 700 flows between the indoor heat exchanger 400 and the outdoor heat exchanger 200; the second connecting pipe 700 is attached to the outer peripheral wall of the first connecting pipe 600, or the second connecting pipe 700 is partially located inside the first connecting pipe 600; the first temperature sensor 150 is arranged at one end of the second connecting pipe 700 close to the outdoor heat exchanger 200; the second temperature sensor 160 is arranged at one end of the second connecting pipe 700 close to the indoor heat exchanger 400; the regulating member 170 is arranged at one end of the second connecting pipe 700 close to the indoor heat exchanger 400, and the regulating member 170 is arranged at one end of the second connecting pipe 700 close to the indoor heat exchanger 400. Component 170 is used to adjust the flow of the refrigerant in the first connecting pipe 600. The adjusting component 170 has multiple adjustment gears. The higher the adjustment gear is, the greater the flow of the refrigerant in the first connecting pipe 600 is. The controller is configured as follows: the first temperature sensor 150 detects the first temperature, the second temperature sensor 160 detects the second temperature, and determines the temperature difference between the second temperature and the first temperature. When the temperature difference is greater than the first preset value 190, the adjustment gear of the adjusting component 170 is increased; when the temperature difference is less than the second preset value 210, the adjustment gear of the adjusting component 170 is reduced.

[0053] When the air conditioner is in cooling mode, low-temperature refrigerant flows in the first connecting pipe 600 and high-temperature refrigerant flows in the second connecting pipe 700, so the temperature of the second connecting pipe 700 is higher than that of the first connecting pipe 600; the second connecting pipe 700 is wrapped around and fits the outer wall of the first connecting pipe 600, so the first connecting pipe 600 absorbs the temperature of the second connecting pipe 700 to reduce the temperature of the refrigerant inside the second connecting pipe 700, and further reduce the temperature of the second connecting pipe 700 entering the indoor heat exchanger 400, thereby increasing the cooling capacity without the need for additional structure and saving costs.

[0054] Please refer to Figure 3 , Figure 4 and Figure 5In some embodiments, the temperature detected by the first temperature sensor 150 is the first temperature, and the temperature detected by the second temperature sensor 160 is the second temperature. The difference between the second temperature and the first temperature is the second temperature minus the first temperature. Because the second temperature and the first temperature are respectively located at the two ends of the second connecting pipe 700, the first temperature is the temperature of the second connecting pipe 700 before being cooled by the first connecting pipe 600, and the second temperature is the temperature of the second connecting pipe 700 after being cooled by the first connecting pipe 600. Therefore, the temperature difference between the first temperature and the second temperature represents the cooling effect of the first connecting pipe 600 on the refrigerant in the second connecting pipe 700. When the difference between the first temperature and the second temperature is too small, it means that the heat exchange effect is not good, so the gear position of the regulating member 170 is reduced, the flow rate and flow velocity of the refrigerant in the second connecting pipe 700 are reduced, so that the heat exchange time between the high-temperature refrigerant in the second connecting pipe 700 and the low-temperature refrigerant in the first connecting pipe 600 is prolonged, the heat exchange effect is improved, and the cooling capacity of the air conditioner is increased.

[0055] When the difference between the first temperature and the second temperature is too large, it means that the cooling effect is good, but the temperature of the refrigerant in the first connecting pipe 600 may rise greatly, the temperature of the refrigerant entering the compressor 500 may be high, and the compressor 500 may overheat and shut down. Therefore, when the temperature difference is greater than the first preset value 190, the adjustment gear of the adjustment member 170 is increased, the flow rate and flow velocity of the refrigerant in the second connecting pipe 700 are accelerated, so that the heat exchange time between the high-temperature refrigerant in the second connecting pipe 700 and the low-temperature refrigerant in the first connecting pipe 600 is reduced, and the heat exchange effect is reduced. Therefore, the temperature rise of the refrigerant in the first connecting pipe 600 is limited, and the temperature of the refrigerant entering the compressor 500 is limited, so as to avoid the compressor 500 from overheating and shutting down, and ensure the air conditioning refrigeration effect while improving the structural stability.

[0056] Please refer to Figure 6 In some embodiments, the air conditioner further comprises an outdoor fan, which is disposed inside the outdoor unit 100 and is used to blow air through the outdoor heat exchanger 200; when the temperature difference is greater than the first preset value 190 and the adjustment gear of the adjustment member 170 is at the highest level, the rotation speed of the outdoor fan is increased. By increasing the rotation speed of the outdoor fan, the cooling of the refrigerant in the outdoor heat exchanger 200 is accelerated, and the temperature of the refrigerant input into the second connecting pipe 700 is reduced, so as to reduce the temperature rise of the refrigerant in the first connecting pipe 600, and avoid the compressor 500 from shutting down due to overheating.

[0057] In some embodiments, the air conditioner further comprises an indoor fan, which is arranged inside the indoor unit 300, and the indoor fan is used to blow air through the indoor heat exchanger 400 to change the temperature of the airflow and blow it into the room to achieve the regulation of the indoor temperature. When the temperature difference is greater than the first preset value 190, and the adjustment gear of the adjustment member 170 is at the highest, and the speed of the outdoor fan reaches the highest, the speed of the indoor fan is reduced. By temporarily reducing the speed of the indoor fan, the refrigerant output from the heat exchanger to the first connecting pipe 600 still has a lower temperature, so the temperature of the refrigerant flowing back to the compressor 500 after heat exchange with the second connecting pipe 700 is also lower, avoiding the compressor 500 from overheating and shutting down. Ensure the stable operation of the compressor 500, and improve the stability of the air conditioner while ensuring the cooling effect.

[0058] Please refer to Figure 6 In some embodiments, when the temperature difference is less than the second preset value 210 and the adjustment gear of the adjustment member 170 is at the lowest, the rotation speed of the outdoor fan is reduced. By reducing the rotation speed of the outdoor fan, the cooling of the refrigerant in the outdoor heat exchanger 200 is slowed down, and the temperature of the refrigerant input to the second connecting pipe 700 is increased to ensure that the difference between the first temperature and the second temperature is between the first preset value 190 and the second preset value 210.

[0059] In some embodiments, when the temperature difference is less than the second preset value 210 and the adjustment gear of the adjustment member 170 is at the lowest level, the power of the compressor 500 is increased or reduced, so that the flow rate and flow velocity of the refrigerant entering the outdoor heat exchanger 200 and the second connecting pipe 700 are reduced, and the cooling of the refrigerant in the second connecting pipe 700 by the first connecting pipe 600 is increased.

[0060] In some embodiments, the regulating member 170 is an expansion valve or a throttle valve, which is a commonly used standard part and is convenient for purchase and use.

[0061] Please refer to Figure 6 and Figure 7 In some embodiments, the first preset value 190 is the set value 180 plus the first change amount, and the second preset value 210 is the set value 180 minus the second change amount. The first preset value 190 and the second preset value 210 are both related to the set value 180, so the first preset value 190 and the second preset value 210 change with the set value 180, which is convenient for adjusting the setting.

[0062] Please refer to Figure 6 and Figure 7In some embodiments, an outdoor temperature sensor is provided inside or outside the outdoor unit 100, and the outdoor temperature sensor is used to detect the outdoor temperature. In the cooling mode, the outdoor temperature is detected, and according to the set value 180 corresponding to the outdoor temperature, the first change amount is added to the corresponding set value 180 to obtain the first preset value 190, and the second change amount is subtracted from the corresponding set value 180 to obtain the second preset value 210. The higher the current outdoor temperature, the higher the value of the set value 180. Because the higher the outdoor temperature, the greater the indoor cooling capacity required, so the greater the temperature difference between the first temperature and the second temperature, the better the indoor cooling capacity.

[0063] In some embodiments, when the outdoor temperature is 0°C, the set value 180 is 1.5°C, and when the outdoor temperature is 40°C, the set value 180 is 4°C.

[0064] In some embodiments, when the outdoor temperature is 0°C-20°C and 25°C-40°C, the setting value 180 has a larger increase, and when it is 20°C-25°C, the increase is more moderate. Because 20°C-25°C is a relatively comfortable temperature for the human body, there is no need to make a large adjustment to the indoor temperature at this time.

[0065] Please refer to Figure 6 and Figure 7 In some embodiments, even if the outdoor temperature exceeds 40°C, the temperature of the set value 180 will not increase further. When the outdoor temperature is higher, the heat exchange effect of the outdoor heat exchanger 200 is worse, and the temperature of the refrigerant in the second connecting pipe 700 is higher, so the temperature rise of the first connecting pipe 600 and the second connecting pipe 700 after heat exchange is larger. Through the design, the temperature difference between the first temperature and the second temperature is within a fixed range and will not be too high, so as to avoid the compressor 500 from overheating and shutting down.

[0066] In some embodiments, the setting value 180 is manually set and can be selected according to user needs, which is convenient for manual control.

[0067] In some embodiments, the first change amount and the second change amount are both between 0.1°C and 1°C.

[0068] In order to reduce the fluctuation of temperature during cooling, the first change amount and the second change amount are both between 0.1℃ and 0.5℃. For example, the first change amount is 0.2℃, the second change amount is 0.5℃, and the set value 180 is 20℃; the first preset value 190 is 20+0.2=20.2℃, and the second preset value 210 is 20-0.5=19.5℃. The controller controls the adjustment gear of the adjustment member 170 and the speed of the outdoor fan so that the temperature difference between the first temperature and the second temperature is between 20.2℃ and 19.5℃.

[0069] In some embodiments, the first variation is equal to the second variation, which is convenient for calculation.

[0070] In some embodiments, a cooling fan is further provided inside the outdoor unit 100, and the cooling fan is used to dissipate heat from the compressor 500. When the temperature difference between the first temperature and the second temperature is greater than a first preset value, the cooling fan is started to cool the compressor 500.

[0071] In some embodiments, when the temperature difference between the first temperature and the second temperature is greater than the first preset value, and the adjustment gear of the adjustment member 170 is at the highest level, and the speed of the outdoor fan has reached the highest level, the cooling fan is started to cool the compressor 500. This prevents the compressor from shutting down due to overheating, ensures the cooling effect, and improves the stability of the structural operation.

[0072] Please refer to Figure 2 and Figure 3 In some embodiments, the second connecting pipe 700 includes a heat exchange section 701 and a connecting section 702 that are connected to each other. The heat exchange section 701 is partially or completely wound around the first connecting pipe 600, and the inner diameter of the heat exchange section 701 is smaller than the inner diameter of the connecting section 702. The expansion valve is replaced by the heat exchange section 701 because the inner diameter of the heat exchange section 701 is smaller. Therefore, when the high-pressure refrigerant passes through the heat exchange section 701 with a smaller diameter and enters the connecting section 702, the refrigerant pressure and temperature will drop rapidly, ensuring that the refrigerant entering the indoor heat exchanger 400 is a low-temperature refrigerant. Therefore, lowering the temperature of the refrigerant at the heat exchange section 701 will further lower the temperature of the refrigerant entering the indoor heat exchanger 400.

[0073] In some embodiments, the first temperature sensor 150 is disposed at one end of the heat exchange section 701 close to the outdoor heat exchanger 200 , and the second temperature sensor 160 is disposed at one end of the heat exchange section 701 close to the connecting section 702 .

[0074] In some embodiments, in order to ensure that the pressure of the refrigerant entering the connecting section 702 after passing through the heat exchange section 701 is relatively small, the inner diameter of the heat exchange section 701 is set to be relatively small, and the inner diameter of the heat exchange section 701 is 0.2 mm~2 mm. The inner diameter of the heat exchange section 701 is adjusted according to the heat exchange efficiency of the air conditioner.

[0075] In some embodiments, the heat exchange section 701 is a capillary tube. In order to improve the heat exchange efficiency between the heat exchange section 701 and the first connecting tube 600, the heat exchange section 701 is made of metal. In order to further improve the heat exchange efficiency between the heat exchange section 701 and the first connecting tube 600, the wall thickness of the heat exchange section 701 is as thin as possible while ensuring the structural strength.

[0076] In some embodiments, in order to improve the heat exchange efficiency between the heat exchange section 701 and the first connecting pipe 600, the first connecting pipe 600 is made of metal, and the wall thickness of the first connecting pipe 600 is as thin as possible while ensuring the structural strength. In order to save costs, only the part of the first connecting pipe 600 wrapped by the heat exchange section 701 is made of metal.

[0077] In some embodiments, the heat exchange section 701 is located in the outdoor unit 100, and one end of the heat exchange section 701 away from the connecting section 702 is connected and communicated with the outdoor heat exchanger 200; and one end of the connecting section 702 away from the heat exchange section 701 is connected and communicated with the indoor heat exchanger 400. Taking the air conditioner in cooling mode as an example, the outdoor heat exchanger 200 has an input end and an output end, and the indoor heat exchanger 400 has an input end and an output end. A section of the heat exchange section 701 close to the outdoor heat exchanger 200 is separated from the first connecting pipe 600, and one end of the heat exchange section 701 close to the outdoor heat exchanger 200 is connected and communicated with the output end of the outdoor heat exchanger 200. A section of the heat exchange section 701 close to the indoor heat exchanger 400 is separated from the first connecting pipe 600, and one end of the heat exchange section 701 close to the indoor heat exchanger 400 is connected and communicated with the connecting section 702. One end of the connecting section 702 away from the heat exchange section 701 is communicated with the input end of the indoor heat exchanger 400. When the air conditioner is in cooling mode, the compressor 500 compresses the refrigerant and cools it down through the outdoor heat exchanger 200 before entering the indoor heat exchanger 400 through the heat exchange section 701 and the connecting section 702. The refrigerant output from the output end of the indoor heat exchanger 400 flows back to the compressor 500 through the first connecting pipe 600 and repeats the cycle. The refrigerant entering the first connecting pipe 600 cools down the refrigerant in the heat exchange section 701.

[0078] In some embodiments, the inner diameter of the heat exchange section 701 is smaller than the inner diameter of the first connecting tube 600; the outer diameter of the heat exchange section 701 is smaller than the outer diameter of the first connecting tube 600. The outer diameter and inner diameter of the heat exchange section 701 are both small, so the heat exchange section 701 is wound around the first connecting tube 600 to increase the contact area between the first connecting tube 600 and the heat exchange section 701, thereby improving the heat exchange effect.

[0079] Please refer to Figure 2 and Figure 3 In some embodiments, the heat exchange section 701 is spirally wound around the first connecting tube 600. During production, the process of winding the heat exchange section 701 around the first connecting tube 600 is simple, and it can be wound clockwise or counterclockwise. Because the heat exchange section 701 is spiral, the heat exchange section 701 has a pitch, which is the distance between two spirals.

[0080] Please refer to Figure 8In some embodiments, the pitch of the heat exchange section 701 is, that is, the heat exchange section 701 is completely wrapped around a section of the first connecting tube 600, and the heat exchange section 701 can be wrapped around the first connecting tube 600 for a large number of turns, thereby increasing the contact area between the heat exchange section 701 and the first connecting tube 600, improving the heat exchange effect, improving the cooling effect on the refrigerant in the second connecting tube 700, and improving the cooling capacity.

[0081] In some embodiments, the pitch of the heat exchange section 701 is not 0, that is, there is a gap between each spiral of the heat exchange section 701 to avoid contact between each spiral of the heat exchange section 701, which causes the refrigerant that has been cooled to rise again. The heat exchange effect is improved, the cooling effect of the refrigerant in the second connecting pipe 700 is improved, and the cooling capacity is increased. The pitch of the heat exchange section 701 is adaptively selected according to the actual existing cooling capacity of the air conditioner.

[0082] Please refer to Fig. 9 and Fig.10 In some embodiments, the first connecting tube 600 and the second connecting tube 700 are intertwined. The first connecting tube 600 and the second connecting tube 700 form a twist shape, which can maximize the contact area between the heat dissipation section and the first connecting tube 600, improve the heat exchange effect, improve the cooling effect of the refrigerant in the second connecting tube 700, and improve the refrigeration capacity. The second connecting tube 700 and the first connecting tube 600 are both spiral and have the same spiral direction. The pitch of the first connecting tube 600 is the outer diameter of the second connecting tube 700. The second connecting tube 700 is arranged in the gap between the spirals of the first connecting tube 600. The extension direction of the second connecting tube 700 is consistent with the spiral direction of the first connecting tube 600.

[0083] Please refer to Fig.11 and Fig.12 In some embodiments, the heat exchange section 701 is partially located inside the first connecting pipe 600, the first end of the heat exchange section 701 close to the outdoor heat exchanger 200 extends through the pipe wall of the first connecting pipe 600, and the end of the heat exchange section 701 close to the connecting section 702 extends through the pipe wall of the first connecting pipe 600, and the heat exchange section 701 is partially sealed through the connecting section 702. The heat exchange section 701 is partially located inside the first connecting pipe 600. In the cooling mode, the part of the heat exchange section 701 located inside the first connecting pipe 600 is wrapped by the low-temperature refrigerant, and the heat exchange section 701 maximizes the heat exchange efficiency of the low-temperature refrigerant. However, this solution may cause the problem of refrigerant leakage when the sealing performance is not good.

[0084] In some embodiments, the heat exchange section 701 is close to the outer peripheral wall of the first connecting tube 600, but the length direction of the first heat exchange section 701 is the same as the length direction of the first connecting tube 600. Its production is simple.

[0085] In some embodiments, the outdoor heat exchanger 200 includes multiple heat pipes. The refrigerant enters the heat exchange section 701 after passing through the heat pipes. The inner diameter of the heat exchange section 701 is smaller than the inner diameter of the heat pipes, ensuring that the refrigerant pressure passing through the heat exchange section 701 is lower than the refrigerant pressure in the heat pipes.

[0086] In some embodiments, the flow direction of the refrigerant in the heat exchange section 701 is consistent with the flow direction of the refrigerant in the first connecting pipe 600 .

[0087] In some embodiments, the flow direction of the refrigerant in the heat exchange section 701 is opposite to the flow direction of the refrigerant in the first connecting pipe 600. The flow rate difference between the low-temperature refrigerant in the first connecting pipe 600 and the high-temperature refrigerant in the heat exchange section 701 is larger. The faster the flow rate of the refrigerant, the better the heat exchange effect. Therefore, the high-temperature refrigerant in the heat exchange section 701 is cooled better, further reducing the temperature of the refrigerant entering the indoor heat exchanger 400 and increasing the cooling capacity.

[0088] In some embodiments, the heat exchange section 701 is connected to the first connecting tube 600 through a connector. The connector includes but is not limited to a cable tie, a binding tape, a rubber ring or bonding. Taking the cable tie as an example, the cable tie is sleeved on the first connecting tube 600, and the cable tie is tightened to make the heat exchange section 701 fit closely to the first connecting tube 600. A plurality of cable ties are arranged at intervals along the length direction of the first connecting tube 600. The cable tie has a simple structure, low cost, and is easy to operate.

[0089] Please refer to Figure 2 , Figure 3 and Figure 4In some embodiments, an output pipe 800, a four-way valve 900, a third connecting pipe 110 and a fourth connecting pipe 120 are further included; the four-way valve 900 includes an input port 901, a first output port 902, a second output port 903 and a third output port 904; the output pipe 800 connects the compressor 500 with the input port 901; the first connecting pipe 600 connects the compressor 500 with the first output port 902; the third connecting pipe 110 connects the indoor heat exchanger 400 with the second output port 903; the fourth connecting pipe 120 connects the outdoor heat exchanger 200 with the third output port 904; the four-way valve 900 is used to connect the input port 901 with the third output port 904, the first output port 902 with the second output port 903; or, the input port 901 is connected with the second output port 903, and the first output port 902 is connected with the third output port 904. The refrigerant outputted by the compressor 500 enters the four-way valve 900 through the input port 901. When the air conditioner is in the cooling mode, the four-way valve 900 connects the input port 901 with the third output port 904, and connects the first output port 902 with the second output port 903. The refrigerant outputted by the compressor 500 enters the fourth connecting pipe 120 through the output pipe 800 and the third output port 904 of the four-way valve 900. The refrigerant entering the fourth connecting pipe 120 enters the outdoor heat exchanger 200 and is cooled. The refrigerant after the heat dissipation enters the heat exchange section 701 of the second connecting pipe 700. The refrigerant passing through the heat exchange section 701 enters the connecting section 702. The pressure and temperature of the refrigerant entering the connecting section 702 are reduced and enter the indoor heat exchanger 400. The indoor unit 300 is provided with an indoor heat exchange fan to blow air into the room through the indoor heat exchanger 400. The air blown into the room is cooled by the indoor heat exchanger 400. The refrigerant passing through the indoor heat exchanger 400 enters the third connecting pipe 110 and flows into the first connecting pipe 600 through the second output port 903 and the first output port 902 of the four-way valve 900. The low-temperature refrigerant entering the first connecting pipe 600 cools the refrigerant in the heat exchange section 701 and then flows back to the compressor 500.

[0090] In the heating mode, the input port 901 is connected to the second output port 903, the first output port 902 is connected to the third output port 904, and the high-temperature refrigerant output by the compressor 500 enters the indoor heat exchanger 400 through the output pipe 800, the second output port 903 of the four-way valve 900, and the third connecting pipe 110. The indoor heat exchange fan blows the air into the room through the indoor heat exchanger 400, and the air blown into the room is heated by the indoor heat exchanger 400. The refrigerant passing through the indoor heat exchanger 400 enters the fourth connecting pipe 120 through the second connecting pipe 700 and the outdoor heat exchanger 200, and the refrigerant in the fourth connecting pipe 120 enters the first connecting pipe 600 through the third output port 904 of the four-way valve 900 and the first output port 902 and flows back to the compressor 500.

[0091] In some embodiments, a first stop valve 130 is provided at one end of the second connecting pipe close to the indoor heat exchanger 400. A second stop valve 140 is provided on the third connecting pipe 110. The flow of the refrigerant entering the indoor heat exchanger 400 is controlled by the first stop valve 130 and the second stop valve 140 to achieve temperature regulation.

[0092] 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: The indoor unit is hollow; An indoor heat exchanger, which is arranged inside the indoor unit; The outdoor unit is hollow; An outdoor heat exchanger is disposed inside the outdoor unit; a refrigerant circulates between the indoor heat exchanger and the outdoor heat exchanger; A compressor is disposed in the outdoor unit, and is used to compress the refrigerant and output it to the outdoor heat exchanger and the indoor heat exchanger; A first connecting pipe, which connects the compressor with the indoor heat exchanger; a refrigerant flows between the indoor heat exchanger and the compressor through the first connecting pipe; a second connecting pipe, which connects the outdoor heat exchanger with the indoor heat exchanger; the refrigerant flows between the indoor heat exchanger and the outdoor heat exchanger through the second connecting pipe; the first connecting pipe and the second connecting pipe are intertwined with each other, the second connecting pipe and the first connecting pipe are both spiral and have the same spiral direction, the pitch of the first connecting pipe is the outer diameter of the second connecting pipe, and the second connecting pipe is arranged in the gap between the spirals of the first connecting pipe; the extension direction of the second connecting pipe is consistent with the spiral direction of the first connecting pipe; The second connecting pipe comprises a heat exchange section and a connecting section connected to each other, and the flow direction of the refrigerant in the heat exchange section is consistent with the flow direction of the refrigerant in the first connecting pipe; A first temperature sensor is disposed at one end of the second connecting pipe close to the outdoor heat exchanger; A second temperature sensor is disposed at one end of the second connecting pipe close to the indoor heat exchanger; A regulating member, which is arranged at one end of the second connecting pipe close to the indoor heat exchanger, and is used to regulate the flow rate of the refrigerant in the first connecting pipe. The regulating member has a plurality of regulating gears, and the higher the regulating gear, the greater the flow rate of the refrigerant in the first connecting pipe; an outdoor fan, the outdoor fan being disposed in the outdoor unit and being used for blowing air through the outdoor heat exchanger; A cooling fan is also provided inside the outdoor unit, and the cooling fan is used to dissipate heat from the compressor; The controller is configured to: the first temperature sensor detects a first temperature, the second temperature sensor detects a second temperature, and determines a temperature difference between the second temperature and the first temperature, and when the temperature difference is greater than a first preset value, increases an adjustment gear of the adjustment member; when the temperature difference is less than a second preset value, decreases an adjustment gear of the adjustment member; When the temperature difference between the first temperature and the second temperature is greater than a first preset value, and the adjustment gear of the adjustment member is at the highest level, and the rotation speed of the outdoor fan has reached the highest level, the cooling fan is started to cool the compressor.

2. The air conditioner according to claim 1, characterized in that: When the temperature difference is greater than a first preset value and the adjustment gear of the adjustment member is at the highest level, the rotation speed of the outdoor fan is increased.

3. The air conditioner according to claim 2, characterized in that: When the temperature difference is less than the second preset value and the adjustment gear of the adjustment member is at the lowest level, the rotation speed of the outdoor fan is reduced.

4. The air conditioner according to claim 3, characterized in that: The first preset value is a set value plus a first change amount, and the second preset value is a set value minus a second change amount.

5. The air conditioner according to claim 4, characterized in that: The outdoor unit is provided with an outdoor temperature sensor, and the outdoor temperature sensor is used to detect the outdoor temperature. If the current outdoor temperature is higher, the value of the set value is higher.

6. The air conditioner according to claim 5, characterized in that: The first change amount and the second change amount have the same value.

7. The air conditioner according to any one of claims 1 to 6, characterized in that: The heat exchange section is partially or completely wound around the first connecting pipe, and the inner diameter of the heat exchange section is smaller than the inner diameter of the connecting section.

8. The air conditioner according to claim 7, characterized in that: The heat exchange section is spirally wound around the outer peripheral wall of the first connecting pipe.

9. The air conditioner according to claim 7, characterized in that: It also includes an output pipe, a four-way valve, a third connecting pipe and a fourth connecting pipe; the four-way valve includes an input port, a first output port, a second output port and a third output port; the output pipe connects the compressor with the input port; the first connecting pipe connects the compressor with the first output port; the third connecting pipe connects the indoor heat exchanger with the second output port; the fourth connecting pipe connects the outdoor heat exchanger with the third output port; The four-way valve is used to connect the input port with the third output port, and the first output port with the second output port; or, the input port with the second output port, and the first output port with the third output port.

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