Air conditioner and air conditioner anti-condensation control method

Abstract

The invention discloses an air conditioner and discloses an air conditioner anti-condensation control method applied to the air conditioner, and the air conditioner comprises a compressor, an outdoor unit coil pipe, an indoor unit and an anti-condensation pipeline. The indoor unit comprises a shell and an indoor unit coil pipe, and a loop allowing a refrigerant to flow is formed among the compressor, the outdoor unit coil pipe and the indoor unit coil pipe. And the input end of the anti-condensation pipeline communicates with the output end of the outdoor unit coil pipe, and the output end of the anti-condensation pipeline communicates with the input end of the indoor unit coil pipe, so that part of the refrigerant flowing out of the outdoor unit coil pipe can flow through the anti-condensation pipeline and flow into the indoor unit coil pipe. The anti-condensation pipeline is provided with an anti-condensation section, and the anti-condensation section is arranged on the shell so that the temperature of the shell can be increased through a refrigerant in the anti-condensation section. According to the air conditioner, the condensation phenomenon on the surface of the shell and the air outlet can be reduced or prevented while the running frequency of the compressor and the rotating speed of the indoor fan are kept, and then the use experience of a user is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to an air conditioner and an anti-condensation control method for the air conditioner. Background Art

[0002] When the air conditioner is running in cooling mode, condensation is likely to occur on the surface of the indoor unit housing and the air outlet, resulting in condensed water often adhering to the surface of the housing and the air outlet. In the prior art, the air conditioner will reduce or prevent the occurrence of condensation by adjusting the operating frequency of the compressor and the speed of the indoor fan. This anti-condensation method will affect the normal air outlet temperature of the air conditioner, thereby reducing the user experience. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an air conditioner that can not only reduce or prevent condensation on the surface of the housing and at the air outlet, but also ensure the user experience.

[0004] The present invention also provides an air conditioner anti-condensation control method applied to the above air conditioner.

[0005] According to the first embodiment of the present invention, the air conditioner comprises a compressor, an outdoor unit coil, an indoor unit and an anti-condensation pipeline. The indoor unit comprises a shell and an indoor unit coil, a circuit for the flow of refrigerant is formed between the compressor, the outdoor unit coil and the indoor unit coil; an anti-condensation pipeline, the input end of the anti-condensation pipeline is connected to the output end of the outdoor unit coil, and the output end of the anti-condensation pipeline is connected to the input end of the indoor unit coil, so that part of the refrigerant flowing out of the outdoor unit coil can flow through the anti-condensation pipeline and flow into the indoor unit coil; the anti-condensation pipeline has an anti-condensation section, and the anti-condensation section is arranged on the shell, so that the refrigerant in the anti-condensation section can increase the temperature of the shell.

[0006] At least the following beneficial effects are achieved:

[0007] The refrigerant flowing out from the output end of the outdoor unit coil is kept at a relatively high temperature. The input end and the output end of the anti-condensation pipeline are respectively connected to the output end of the outdoor unit coil and the input end of the indoor unit coil, so part of the refrigerant flowing out from the output end of the outdoor unit coil will flow into the anti-condensation pipeline. The anti-condensation pipeline has an anti-condensation section, and the anti-condensation section is arranged on the shell. When the refrigerant with a relatively high temperature in the anti-condensation pipeline flows through the anti-condensation section, the refrigerant with a relatively high temperature will transfer heat to the shell, so that the overall temperature of the shell can be increased, and then the temperature of the surface of the shell and the air outlet can be increased. When the temperature of the shell surface and the air outlet is increased, the difference between the temperature of the shell surface and the air outlet and the dew point temperature of the air can be reduced, and even the temperature of the shell surface and the air outlet can be greater than the dew point temperature of the air, thereby reducing or preventing the generation of condensation. The air conditioner can reduce or prevent the generation of condensation on the shell surface and the air outlet while maintaining the operating frequency of the compressor and the speed of the indoor fan, thereby helping to ensure the user experience.

[0008] The air conditioner according to the first embodiment of the present invention further includes a first valve, which is arranged on the input end of the anti-condensation pipeline, and the first valve is used to open or close the anti-condensation pipeline.

[0009] The air conditioner according to the first aspect of the present invention further includes a second valve, which is arranged on the input end of the indoor unit coil. The second valve is used to open or close the input end of the indoor unit coil. The second valve can close the input end of the indoor unit coil so that the refrigerant flowing out of the outdoor unit coil can all flow into the anti-condensation pipeline.

[0010] The air conditioner according to the first aspect of the present invention further includes a throttling element, which is arranged on the circuit, between the outdoor unit coil and the indoor unit coil, and the refrigerant flowing out of the anti-condensation pipeline flows through the throttling element and then flows into the indoor unit coil.

[0011] The air conditioner according to the first embodiment of the present invention further includes a one-way valve, which is arranged on the output end of the anti-condensation pipeline, and the output end of the anti-condensation pipeline is connected to the input end of the indoor unit coil through the one-way valve.

[0012] According to the air conditioner of the first aspect of the present invention, the air conditioner further includes a flow meter and a regulating valve, and the flow meter and the regulating valve are both arranged on the anti-condensation pipeline so that the refrigerant flows through the flow meter and the regulating valve in sequence and then flows into the anti-condensation section.

[0013] According to the air conditioner anti-condensation control method of the second aspect of the present invention, applied to the air conditioner of the first aspect of the above-mentioned embodiment, the air conditioner anti-condensation control method includes a preset operation time threshold; after the air conditioner is started and runs in cooling mode, the real-time operation time of the compressor is obtained, and the real-time indoor temperature of the indoor environment is obtained; after the real-time operation time is equal to the operation time threshold, the coil temperature of the indoor unit coil, the outdoor temperature of the outdoor environment, the relative humidity of the indoor environment, and the temperature change amplitude of the real-time indoor temperature are obtained; according to the comparison result of the relative humidity, the coil temperature, the outdoor temperature and the temperature change amplitude with the set threshold, the air conditioner is triggered to run the first anti-condensation mode or the second anti-condensation mode; in the first anti-condensation mode, the first valve and the second valve are kept open at the same time, so that the refrigerant flowing out of the outdoor unit coil can flow into the indoor unit coil and the anti-condensation pipeline; in the second anti-condensation mode, the first valve is kept open and the second valve is kept closed, so that the refrigerant flowing out of the outdoor unit coil can only flow into the anti-condensation pipeline.

[0014] At least the following beneficial effects are achieved: the anti-condensation control method for the air conditioner has all the beneficial effects brought by the above-mentioned air conditioner, which will not be described repeatedly here.

[0015] According to the air conditioner anti-condensation control method of the second aspect of the present invention, a first relative humidity threshold and a second relative humidity threshold are preset, and the second relative humidity threshold is greater than the first relative humidity threshold; after the real-time running time is equal to the running time threshold, it is judged whether the relative humidity meets the first condition, and the first condition is that the relative humidity is less than the second relative humidity threshold and greater than or equal to the first relative humidity threshold. If the relative humidity meets the first condition, the air conditioner runs the first anti-condensation mode; if the relative humidity does not meet the first condition, it is judged whether the relative humidity meets the second condition, and the second condition is that the relative humidity is greater than or equal to the second relative humidity threshold. If the relative humidity meets the second condition, the air conditioner runs the second anti-condensation mode.

[0016] According to the air conditioner anti-condensation control method of the second embodiment of the present invention, a first outdoor temperature threshold, a first coil temperature threshold, a second coil temperature threshold and a first temperature change amplitude threshold are preset, and the second coil temperature threshold is greater than the first coil temperature threshold; if the relative humidity does not meet the second condition, it is determined whether the outdoor temperature, the coil temperature and the temperature change amplitude meet the third condition, and the third condition is that the outdoor temperature is less than or equal to the first outdoor temperature threshold, the coil temperature is less than or equal to the second coil temperature threshold and greater than the first coil temperature threshold, and the temperature change amplitude is less than the first temperature change amplitude threshold; if the outdoor temperature, the coil temperature and the temperature change amplitude meet the third condition, the air conditioner operates in the first anti-condensation mode.

[0017] According to the air conditioner anti-condensation control method of the second aspect of the present invention, a second outdoor temperature threshold and a second temperature change amplitude threshold are preset, the second outdoor temperature threshold is greater than the first outdoor temperature threshold, and the second temperature change amplitude threshold is less than the first temperature change amplitude threshold; if the outdoor temperature, the coil temperature and the temperature change amplitude do not meet the third condition, it is judged whether the outdoor temperature, the coil temperature and the temperature change amplitude meet the fourth condition, and the fourth condition is that the outdoor temperature is less than or equal to the second outdoor temperature threshold and greater than the first outdoor temperature threshold, the coil temperature is less than or equal to the first coil temperature threshold, and the temperature change amplitude is less than the second temperature change amplitude threshold; if the outdoor temperature, the coil temperature and the temperature change amplitude meet the fourth condition, the air conditioner runs the second anti-condensation mode.

[0018] 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

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0020] Figure 1 It is a schematic diagram of the refrigerant flow of the air conditioner in the cooling mode according to the first aspect of the present invention;

[0021] Figure 2 A schematic diagram of refrigerant flow in an air conditioner in a first anti-condensation mode according to an embodiment of the first aspect of the present invention;

[0022] Figure 3 It is a schematic diagram of the refrigerant flow of the air conditioner in the second anti-condensation mode according to the first aspect of the present invention;

[0023] Figure 4It is a structural schematic diagram of a housing, an anti-condensation section and an internal unit coil in an air conditioner according to an embodiment of the first aspect of the present invention;

[0024] Figure 5 It is a structural schematic diagram of the housing, the anti-condensation section and the internal unit coil in the air conditioner according to the first aspect of the present invention from another perspective;

[0025] Figure 6 A logic flow chart of an air conditioner anti-condensation control method according to a second aspect of the present invention;

[0026] Figure Number:

[0027] Compressor 100;

[0028] Outdoor unit coil 200; outdoor fan 210;

[0029] Indoor unit coil 300; indoor fan 310; housing 320; second valve 330; throttling element 340; second three-way valve 350;

[0030] Anti-condensation pipeline 400; anti-condensation section 410; first valve 420; one-way valve 430; flow meter 440; regulating valve 450; first three-way valve 460. DETAILED DESCRIPTION

[0031] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are 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, and do not indicate or imply 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 a limitation on the present invention.

[0032] In the description of the present invention, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0033] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0034] refer to Figure 1 , Figure 2 , Figure 4 and Figure 5 The present invention discloses an air conditioner, including a compressor 100, an outdoor unit coil 200, an indoor unit and an anti-condensation pipeline 400.

[0035] The indoor unit includes a housing 320 and an indoor unit coil 300, and a loop for refrigerant flow is formed between the compressor 100, the outdoor unit coil 200 and the indoor unit coil 300. An anti-condensation pipeline 400, the input end of which is connected to the output end of the outdoor unit coil 200, and the output end of which is connected to the input end of the indoor unit coil 300, so that part of the refrigerant flowing out of the outdoor unit coil 200 can flow through the anti-condensation pipeline 400 and flow into the indoor unit coil 300. The anti-condensation pipeline 400 has an anti-condensation section 410, which is provided on the housing 320, so that the refrigerant in the anti-condensation section 410 can increase the temperature of the housing 320.

[0036] It should be explained that in the prior art, the indoor unit coil 300 is arranged in the housing 320 in the indoor unit, and the housing 320 is also provided with an indoor fan 310. During the cooling process of the air conditioner, the temperature of the indoor unit coil 300 is relatively low, so that the surface temperature of the housing 320 adjacent thereto will also decrease accordingly. When the surface temperature of the housing 320 is lower than the dew point temperature of the indoor air, the water vapor in the air will condense on the surface of the housing 320 to form condensed water when it encounters cold. The air outlet on the housing 320 is the outlet of the refrigerated cold air. When the cold air blows into the room through the air outlet, the temperature near the air outlet will drop rapidly. When the temperature at the air outlet drops below the dew point temperature of the indoor air, the water vapor in the air will condense at the air outlet to form condensed water. When the condensation phenomenon is serious, a large amount of condensed water will be attached to the surface of the housing 320 and the air outlet. On the one hand, when the user sees that the surface of the housing 320 and the air outlet are attached with condensed water, psychological discomfort will occur. On the other hand, the attached condensed water will drip into the room, causing additional cleaning burden for users, so it is necessary to set up anti-condensation measures for the air conditioner.

[0037] At present, the air conditioner can reduce or prevent the occurrence of condensation by adjusting the operating frequency of the compressor 100 and the rotation speed of the indoor fan 310. For example, the operating frequency of the compressor 100 is reduced to slow down the evaporation rate of the refrigerant in the indoor unit coil 300, thereby slowing down the cooling rate of the indoor unit coil 300 and the housing 320 to suppress the occurrence of condensation; for example, the rotation speed of the indoor fan 310 is reduced to slow down the cooling rate of the housing 320 to suppress the occurrence of condensation; for example, the rotation speed of the indoor fan 310 is increased so that the water vapor in the air is blown into the room before it has time to condense. Frequent adjustment of the rotation speed of the indoor fan 310 will not only make the blown wind fluctuate, but also make the indoor fan 310 make abnormal noises due to unstable rotation speed, which reduces the user's experience. On the other hand, frequent adjustment of the operating frequency of the compressor 100 will make the outlet air temperature fluctuate, resulting in unstable indoor temperature, which will also reduce the user's experience.

[0038] In the embodiment of the present invention, reference Figure 1 The housing 320 includes the indoor coil 300 and the housing 320. The exhaust end of the compressor 100 is connected to the input end of the outdoor coil 200, the output end of the outdoor coil 200 is connected to the input end of the indoor coil 300, and the output end of the indoor coil 300 is connected to the suction end of the compressor 100, so that a loop for the flow of refrigerant is formed between the compressor 100, the outdoor coil 200 and the indoor coil 300. After the air conditioner starts the cooling mode, the refrigerant flowing out of the exhaust end of the compressor 100 first flows into the outdoor coil 200, then the refrigerant in the outdoor coil 200 flows into the indoor coil 300, and finally the refrigerant in the indoor coil 300 flows into the suction end of the compressor 100, and the cycle repeats. The anti-condensation pipeline 400 is used to supply the refrigerant flow, the input end of the anti-condensation pipeline 400 is connected to the output end of the outdoor unit coil 200, and the output end of the anti-condensation pipeline 400 is connected to the input end of the indoor unit coil 300. The refrigerant flowing out from the output end of the outdoor unit coil 200 will be divided into two parts, one part of the refrigerant will flow through the anti-condensation pipeline 400 and flow into the indoor unit coil 300, and the other part of the refrigerant will directly flow into the indoor unit coil 300.

[0039] refer to Figure 1 , Figure 4 and Figure 5 The anti-condensation pipeline 400 has an anti-condensation section 410, which is located between the input end and the output end of the anti-condensation pipeline 400, and the anti-condensation section 410 is evenly distributed on the inner wall of the shell 320. Since the temperature of the refrigerant flowing out of the outdoor unit coil 200 is relatively high, the temperature of part of the refrigerant flowing into the anti-condensation pipeline 400 is relatively high. When the refrigerant in the anti-condensation pipeline 400 flows through the anti-condensation section 410, the refrigerant with a relatively high temperature in the anti-condensation section 410 transfers heat to the shell 320, so that the overall temperature of the shell 320 can be increased, and then the temperature of the surface of the shell 320 and the air outlet can be increased.

[0040] It should be explained that the compressor 100 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, so that the internal energy of the refrigerant increases and the temperature rises significantly, and then the high-temperature and high-pressure gaseous refrigerant flows into the external unit coil 200. The high-temperature and high-pressure gaseous refrigerant flowing into the external unit coil 200 will condense in the coil and release heat to the surrounding environment. The condensation of the gaseous refrigerant in the external unit coil 200 is a gradual process. Although most of the refrigerant will change from gas to liquid, it is difficult to make all the gaseous refrigerants completely converted instantly in this process. In actual situations, when the liquid refrigerant flows out of the external unit coil 200, some gaseous refrigerant will mix with it. Since the heat of these gaseous refrigerants is high, the refrigerant flowing out as a whole still maintains a high temperature. The above process is common knowledge in the field of air conditioners and will not be further described here. It should be explained that the dew point temperature of the air refers to when the air temperature drops to the dew point temperature, the water vapor in the air will begin to condense into condensed water. When the surface temperature of an object is lower than the dew point temperature of the air, and the difference between the surface temperature of the object and the dew point temperature of the air is large, the condensation phenomenon will be more serious.

[0041] It can be understood that the refrigerant flowing out from the output end of the outdoor unit coil 200 maintains a relatively high temperature, and the input end and the output end of the anti-condensation pipeline 400 are respectively connected to the output end of the outdoor unit coil 200 and the input end of the indoor unit coil 300, so part of the refrigerant flowing out from the output end of the outdoor unit coil 200 will flow into the anti-condensation pipeline 400. The anti-condensation pipeline 400 has an anti-condensation section 410, and the anti-condensation section 410 is arranged on the shell 320. When the refrigerant maintaining a relatively high temperature in the anti-condensation pipeline 400 flows through the anti-condensation section 410, the refrigerant maintaining a relatively high temperature will transfer heat to the shell 320, so that the overall temperature of the shell 320 can be increased, and then the temperature of the surface of the shell 320 and the air outlet can be increased. When the temperature of the surface of the housing 320 and the air outlet increases, the difference between the temperature of the surface of the housing 320 and the air outlet and the dew point temperature of the air can be reduced, and even the temperature of the surface of the housing 320 and the air outlet can be greater than the dew point temperature of the air, thereby reducing or preventing the generation of condensation. The air conditioner can reduce or prevent the generation of condensation on the surface of the housing 320 and the air outlet while maintaining the operating frequency of the compressor 100 and the speed of the indoor fan 310, thereby helping to ensure the user experience.

[0042] Furthermore, when the overall temperature of the shell 320 increases, the surface temperature of the indoor unit coil 300 in the shell 320 will also increase accordingly, so that the difference between the surface temperature of the indoor unit coil 300 and the dew point temperature of the air can be reduced, and the surface temperature of the indoor unit coil 300 can even be greater than the dew point temperature of the air, thereby reducing or preventing the occurrence of condensation on the surface of the indoor unit coil 300, and effectively suppressing the condensation phenomenon in the shell 320.

[0043] refer to Figure 2 The air conditioner further includes a first valve 420, which is disposed on the input end of the anti-condensation pipeline 400, and the first valve 420 is used to open or close the input end of the anti-condensation pipeline 400. It is understandable that when anti-condensation is required, the first valve 420 will open the input end of the anti-condensation pipeline 400, so that part of the refrigerant flowing out of the outdoor unit coil 200 can flow into the anti-condensation pipeline 400. When anti-condensation is not required, the first valve 420 will close the input end of the anti-condensation pipeline 400, so that all the refrigerant flowing out of the outdoor unit coil 200 can flow into the indoor unit coil 300. In the embodiment of the present invention, the first valve 420 may be a first solenoid valve.

[0044] refer to Figure 3 The air conditioner further includes a second valve 330, which is disposed on the input end of the indoor unit coil 300. The second valve 330 is used to open or close the input end of the indoor unit coil 300. The second valve 330 can close the input end of the indoor unit coil 300 so that all the refrigerant flowing out of the outdoor unit coil 200 can flow into the anti-condensation pipeline 400. It can be understood that when the outdoor temperature is high or the relative humidity of the indoor air is high, in these special cases, a large amount of condensed water is easily condensed on the surface of the housing 320 and the air outlet. When the air conditioner detects that it is currently in these special conditions after running for a period of time, the first valve 420 can be kept open, and the second valve 330 can close the input end of the indoor unit coil 300, so that the refrigerant with a relatively high temperature flowing out of the outdoor unit coil 200 can all flow into the anti-condensation pipeline 400, thereby allowing the refrigerant in the anti-condensation section 410 to have more heat transferred to the shell 320, so that the overall temperature of the shell 320 can be quickly increased to inhibit condensation on the surface and air outlet of the shell 320, thereby preventing a large amount of condensed water from condensing on the surface and air outlet of the shell 320. In the embodiment of the present invention, the second valve 330 can be a second electromagnetic valve.

[0045] It should be explained that the dew point temperature of the air is related to the ambient temperature. When the outdoor temperature rises, the indoor temperature is also likely to rise. Under certain humidity conditions, the temperature increase will increase the saturated water vapor pressure of the air, and the dew point temperature of the air will also increase accordingly. When the outdoor temperature is high and causes the indoor temperature to be high, the dew point temperature of the indoor air will also become higher accordingly. At this time, the temperature difference between the temperature on the surface of the shell 320 and the air outlet and the dew point temperature of the air will increase. According to the condensation principle, the greater the temperature difference, the easier it is for water vapor to reach the dew point temperature on the low-temperature surface and condense, so the condensation phenomenon will be more serious. When the relative humidity of the indoor air is high, it means that the water vapor content in the air is closer to the saturation state. In this case, when the condensation conditions are formed, more water vapor can condense into liquid water than when the relative humidity is low. Therefore, when the relative humidity of the indoor air is high, the condensation phenomenon will be more serious.

[0046] refer to Figures 1 to 3 The air conditioner further includes a throttling element 340, which is arranged on the circuit, and between the outdoor unit coil 200 and the indoor unit coil 300, and the refrigerant flowing out of the anti-condensation pipeline 400 flows through the throttling element 340 and then flows into the indoor unit coil 300. The throttling element 340 can be a thermal expansion valve, an electronic expansion valve or a capillary tube. The throttling element 340 is a common element in the field of air conditioners, and will not be further described here.

[0047] It is understandable that when the second valve 330 remains closed and the first valve 420 remains open, the refrigerant flowing out of the compressor 100 flows through the outdoor unit coil 200, the first valve 420, the anti-condensation pipeline 400, the throttling element 340 and the indoor unit coil 300 in sequence, and finally the refrigerant in the indoor unit coil 300 flows back into the compressor 100, and the cycle repeats. The refrigerant flowing out of the anti-condensation pipeline 400 flows through the throttling element 340 and then flows into the indoor unit coil 300. The refrigerant flowing into the indoor unit coil 300 can still evaporate and absorb heat, that is, the air conditioner is still in a cooling state at this time. Specifically, when the second valve 330 remains closed and the first valve 420 remains open, all the refrigerant flowing out of the outdoor unit coil 200 flows into the indoor unit coil 300 after passing through the anti-condensation pipeline 400 and the throttling element 340. Since the temperature of the refrigerant will be reduced after flowing through the anti-condensation pipeline 400, the refrigerant flowing into the indoor unit coil 300 may have a large degree of supercooling, and can even make the air conditioner have a better cooling effect.

[0048] refer to Figures 1 to 3The air conditioner further includes a one-way valve 430, which is arranged on the output end of the anti-condensation pipeline 400. The output end of the anti-condensation pipeline 400 is connected to the input end of the indoor unit coil 300 through the one-way valve 430. It can be understood that the refrigerant in the anti-condensation pipeline 400 can flow into the indoor unit coil 300 through the one-way valve 430. The one-way valve 430 is a component that allows the refrigerant to flow freely in one direction and hinders the flow of the refrigerant in the opposite direction. In the embodiment of the present invention, the one-way valve 430 allows the refrigerant in the anti-condensation pipeline 400 to flow into the input end of the indoor unit coil 300, while the refrigerant at the input end of the indoor unit coil 300 cannot flow into the anti-condensation pipeline 400 through the one-way valve 430.

[0049] refer to Figures 1 to 3 The air conditioner further includes a flow meter 440 and a regulating valve 450, both of which are arranged on the anti-condensation pipeline 400, so that the refrigerant flows through the flow meter 440 and the regulating valve 450 in sequence and then flows into the anti-condensation section 410. In the embodiment of the present invention, the refrigerant flowing into the anti-condensation pipeline 400 flows through the flow meter 440 and the regulating valve 450 in sequence and then flows into the anti-condensation section 410. The flow meter 440 is used to measure the flow rate of the refrigerant in the anti-condensation pipeline 400 and feed back the flow rate signal to the control system of the air conditioner. When the flow meter 440 detects that the flow rate of the refrigerant is higher than the set value, the flow meter 440 will send this information to the control system of the air conditioner. According to the signal, the control system sends an instruction to the regulating valve 450 to let the regulating valve 450 close the valve opening to reduce the flow rate of the refrigerant. On the contrary, when the flow rate of the refrigerant is lower than the set value, the control system of the air conditioner increases the opening of the regulating valve 450 to make the flow rate of the refrigerant return to a suitable range. Through the cooperation between the flow meter 440 and the regulating valve 450, the air conditioner can accurately control the flow rate of the refrigerant in the anti-condensation pipeline 400, and then the air conditioner can control the amount of heat transferred to the shell 320 by the anti-condensation section 410 according to the condensation situation. In the embodiment of the present invention, the regulating valve 450 can be an electric regulating valve 450, and the flow meter 440 is an electromagnetic flow meter 440. The regulating valve 450 and the flow meter 440 are both common components in the field of air conditioners, and will not be further described here.

[0050] In the embodiment of the present invention, the air conditioner further includes a first three-way valve 460, a second three-way valve 350 and an outdoor unit. The first three-way valve 460 has a first inlet, a first outlet and a second outlet, and the second three-way valve 350 has a second inlet, a third outlet and a fourth outlet. The output end of the outdoor unit coil 200 is communicated with the first inlet of the first three-way valve 460, the input end of the anti-condensation pipeline 400 is communicated with the first outlet of the first three-way valve 460, the second outlet of the first three-way valve 460 is communicated with the second inlet of the second three-way valve 350 through the second valve 330, the fourth outlet of the second three-way valve 350 is communicated with the input end of the indoor unit coil 300 through the throttling element 340, and the third outlet of the second three-way valve 350 is communicated with the output end of the anti-condensation pipeline 400. The outdoor unit includes an outdoor unit coil 200 and an outdoor fan 210, and the outdoor fan 210 is arranged corresponding to the outdoor unit coil 200. The indoor unit also includes an indoor fan 310, and the indoor fan 310 is arranged corresponding to the indoor unit coil 300. The first three-way valve 460, the second three-way valve 350, the outdoor fan 210 and the indoor fan 310 are all common components in the field of air conditioners, and will not be further described here.

[0051] refer to Figure 1 , Figure 2 , Figure 3 and Figure 6 The embodiment of the present invention also provides an air conditioner anti-condensation control method, which is applied to the air conditioner. The air conditioner anti-condensation control method includes presetting an operating time threshold; after the air conditioner is started and runs in a cooling mode, obtaining the real-time operating time of the compressor 100 and the real-time indoor temperature of the indoor environment; after the real-time operating time is equal to the operating time threshold, obtaining the coil temperature of the indoor unit coil 300, obtaining the outdoor temperature of the outdoor environment, obtaining the relative humidity of the indoor environment, and obtaining the temperature change amplitude of the real-time indoor temperature.

[0052] Based on the comparison results of relative humidity, coil temperature, outdoor temperature and temperature change amplitude with the set threshold value, the air conditioner is triggered to operate in the first anti-condensation mode or the second anti-condensation mode; in the first anti-condensation mode, the first valve 420 and the second valve 330 are kept open at the same time, so that the refrigerant flowing out of the outdoor unit coil 200 can flow into the indoor unit coil 300 and the anti-condensation pipeline 400; in the second anti-condensation mode, the first valve 420 is kept open and the second valve 330 is kept closed, so that the refrigerant flowing out of the outdoor unit coil 200 can only flow into the anti-condensation pipeline 400.

[0053] For the convenience of explanation, the running time threshold is defined as T 运行 , the real-time running time of the compressor 100 is T 压缩机 , the real-time indoor temperature of the indoor environment is t 室内 , the coil temperature of the indoor unit coil 300 is t 盘管 , the outdoor temperature of the outdoor environment is t室外 , the relative humidity of the indoor environment is RH 室内 , real-time indoor temperature t 室内 The temperature change amplitude is Δt 室内 It should be explained that the coil temperature of the indoor unit coil 300 is the surface temperature of the indoor unit coil 300 .

[0054] Understandably, reference Figure 2 , when the air conditioner is based on RH 室内 ,t 室外 ,t 盘管 and Δt 室内 After running the first anti-condensation mode, it means that the condensation phenomenon generated in the shell 320 is relatively light. At this time, the refrigerant flowing out of the outdoor unit coil 200 will flow into the indoor unit coil 300 and the anti-condensation pipeline 400 respectively. When the refrigerant maintained at a relatively high temperature in the anti-condensation pipeline 400 flows through the anti-condensation section 410, the refrigerant maintained at a relatively high temperature will transfer heat to the shell 320, so that the overall temperature of the shell 320 can be increased, and then the temperature of the surface of the shell 320 and the air outlet can be increased, so as to reduce or prevent the generation of condensation on the surface of the shell 320 and the air outlet. Reference Figure 3 , when the air conditioner is adjusted according to RH 室内 ,t 室外 ,t 盘管 and Δt 室内 After the second anti-condensation mode is run, it means that the condensation phenomenon generated in the shell 320 is relatively serious. At this time, all the refrigerant flowing out of the outdoor unit coil 200 flows into the anti-condensation pipeline 400, so that the refrigerant in the anti-condensation section 410 has more heat transferred to the shell 320, so that the overall temperature of the shell 320 can be quickly increased to suppress the serious condensation phenomenon on the surface of the indoor unit coil 300, the surface of the shell 320 and the air outlet.

[0055] In the embodiment of the present invention, reference Figure 2 When the air conditioner is running in the first anti-condensation mode, part of the refrigerant flowing out of the outdoor unit coil 200 will flow into the anti-condensation pipeline 400, and the other part of the refrigerant flowing out of the outdoor unit coil 200 will flow into the indoor unit coil 300. The refrigerant flowing into the indoor unit coil 300 will evaporate and absorb heat. In other words, the air conditioner is in a cooling state while running in the first anti-condensation mode. Figure 3When the air conditioner is running in the second anti-condensation mode, the refrigerant flowing out of the anti-condensation pipeline 400 flows through the throttling element 340 and then flows into the indoor unit coil 300. The refrigerant flowing into the indoor unit coil 300 can still evaporate and absorb heat. In other words, the air conditioner is also in a cooling state when running in the second anti-condensation mode. It can be seen from this that the air conditioner in the embodiment of the present invention can ensure the normal cooling of the air conditioner while running in the first anti-condensation mode and the second anti-condensation mode, ensuring that the user experience will not be reduced.

[0056] In the embodiment of the present invention, the air conditioner further comprises a first temperature sensor, a second temperature sensor, a third temperature sensor, a humidity sensor and a timer. The first temperature sensor, the second temperature sensor and the humidity sensor are all arranged in the indoor unit. The first temperature sensor is used to detect the coil temperature t of the indoor unit coil 300. 盘管 The second temperature sensor is used to detect the real-time indoor temperature of the indoor environment. 室内 , humidity sensor is used to detect the relative humidity RH of the indoor environment 室内 The third temperature sensor is arranged in the outdoor unit and is used to detect the outdoor temperature of the outdoor environment. 室外 The timer is used to record the real-time running time T of the compressor 100. 压缩机 The first temperature sensor, the second temperature sensor, the third temperature sensor, the humidity sensor and the timer are all common components in the field of air conditioners, and their principles and settings will not be further described here.

[0057] Referring to FIG. 6 , the air conditioner anti-condensation control method further includes presetting a first relative humidity threshold and a second relative humidity threshold, wherein the second relative humidity threshold is greater than the first relative humidity threshold. After the real-time operation time is equal to the operation time threshold, it is determined whether the relative humidity meets a first condition, wherein the first condition is that the relative humidity is less than the second relative humidity threshold and is greater than or equal to the first relative humidity threshold. If the relative humidity meets the first condition, the air conditioner runs the first anti-condensation mode. If the relative humidity does not meet the first condition, it is determined whether the relative humidity meets a second condition, wherein the second condition is that the relative humidity is greater than or equal to the second relative humidity threshold. If the relative humidity meets the second condition, the air conditioner runs the second anti-condensation mode.

[0058] For the convenience of explanation, the first relative humidity threshold is defined as RH 1 , define the second relative humidity threshold as RH 2 , the first condition is RH 2 >RH 室内 ≥RH 1 , the second condition is RH 室内 ≥RH 2It is understandable that when the relative humidity of the indoor air is high, the condensation phenomenon of the housing 320 will be more serious. 压缩机 Equal to T 运行 Then, the relative humidity RH of the indoor environment is obtained. 室内 And judge RH 室内 Whether the first condition is met, if RH 室内 If the first condition is met, it means that the relative humidity of the current indoor environment is moderate. At this time, the condensation on the surface of the housing 320 and the indoor unit coil 300 is relatively light, and the air conditioner can operate in the first anti-condensation mode. 室内 The first condition is not met, and RH 室内 When the second condition is met, it means that the relative humidity of the current indoor environment is relatively high. At this time, the condensation phenomenon on the surface of the housing 320 and the indoor unit coil 300 is relatively serious. The air conditioner needs to run the second anti-condensation mode to suppress the serious condensation phenomenon.

[0059] refer to Figure 6 The air conditioner anti-condensation control method further includes presetting a first outdoor temperature threshold, a first coil temperature threshold, a second coil temperature threshold and a first temperature change amplitude threshold, wherein the second coil temperature threshold is greater than the first coil temperature threshold. If the relative humidity does not meet the second condition, it is determined whether the outdoor temperature, the coil temperature and the temperature change amplitude meet the third condition, wherein the third condition is that the outdoor temperature is less than or equal to the first outdoor temperature threshold, the coil temperature is less than or equal to the second coil temperature threshold and greater than the first coil temperature threshold, and the temperature change amplitude is less than the first temperature change amplitude threshold; if the outdoor temperature, the coil temperature and the temperature change amplitude meet the third condition, the air conditioner operates in the first anti-condensation mode.

[0060] For the convenience of explanation, the first outdoor temperature threshold is defined as t 外1 , the first coil temperature threshold is t 管1 , the second coil temperature threshold is t 管2 , the first temperature change amplitude threshold is Δt 1 The third condition is t 室外 ≤t 外1 , t 管1 <t 盘管 ≤t 管2 , Δt 室内 <Δt 1 .

[0061] It should be explained that after the air conditioner runs in cooling mode, the compressor 100 will start, and the air conditioner will start to record the real-time running time T of the compressor 100. 压缩机 At the same time, the air conditioner will obtain the real-time indoor temperature of the current indoor environment as t 室内 , and every minute, the air conditioner will obtain the current real-time indoor temperature t室内 When the real-time running time of the compressor 100 is T 压缩机 Equal to the running time threshold T 运行 When the air conditioner obtains the real-time indoor temperature t of the current indoor environment 室内 , and calculate the real-time indoor temperature t of the last minute 室内 The current real-time indoor temperature 室内 The difference is the real-time indoor temperature t 室内 Temperature variation Δt 室内 The condition for condensation is that the hot air in the evaporative environment (indoor environment) encounters a relatively low temperature surface (such as the surface of the indoor unit coil 300 and the surface of the housing 320 and the air outlet). If the indoor environment temperature changes by a small amplitude, that is, the temperature change amplitude Δt 室内 If the indoor temperature is small, it means that the indoor temperature is still relatively high. At this time, the air in the indoor environment will easily condense when it encounters a surface with a relatively low temperature. On the contrary, if the indoor temperature changes greatly, that is, the temperature change amplitude Δt 室内 If it is larger, it proves that the indoor temperature is lower. At this time, the air in the indoor environment is not likely to produce condensation when it encounters a surface with a relatively low temperature.

[0062] If the outdoor temperature t 室外 , coil temperature t 盘管 and the temperature change amplitude Δt 室内 The third condition is met, and the air conditioner operates in the first anti-condensation mode. It can be understood that when t 室外 ≤t 外1 When, it represents the current outdoor temperature t 室外 As mentioned above, the outdoor ambient temperature t 室外 Will affect the indoor ambient temperature 室内 , at outdoor temperature t 室外 When the temperature is lower, the dew point temperature of the indoor air will also decrease accordingly. At this time, the temperature difference between the surface temperature of the indoor unit coil 300, the surface temperature of the shell 320 and the air outlet and the air dew point temperature will decrease. According to the condensation principle, the smaller the temperature difference, the less likely it is for water vapor to reach the dew point temperature and condense on the low-temperature surface, so the condensation phenomenon will be lighter. When t 管1 <t 盘管 ≤t 管2 When t is t, it means the current coil temperature of the indoor unit coil 300 is t 盘管 Moderate, that is, the coil temperature t of the indoor unit coil 300 盘管 The temperature difference between the dew point temperature and the air temperature is small, and the condensation on the surface of the indoor unit coil 300 is also light. 室内 <Δt 1When the outdoor temperature is t 室外 , coil temperature t 盘管 and the temperature change amplitude Δt 室内 When the third condition is met, it means that the condensation phenomenon currently generated on the surface of the indoor unit coil 300, the surface of the housing 320 and the air outlet is relatively light, and at this time the air conditioner only needs to operate the first anti-condensation mode.

[0063] refer to Figure 6 The air conditioner anti-condensation control method also includes presetting a second outdoor temperature threshold and a second temperature change amplitude threshold, the second outdoor temperature threshold is greater than the first outdoor temperature threshold, and the second temperature change amplitude threshold is less than the first temperature change amplitude threshold; if the outdoor temperature, the coil temperature and the temperature change amplitude do not meet the third condition, it is judged whether the outdoor temperature, the coil temperature and the temperature change amplitude meet the fourth condition, the fourth condition is that the outdoor temperature is less than or equal to the second outdoor temperature threshold and greater than the first outdoor temperature threshold, and the coil temperature is less than or equal to the first coil temperature threshold, and the temperature change amplitude is less than the second temperature change amplitude threshold; if the outdoor temperature, the coil temperature and the temperature change amplitude meet the fourth condition, the air conditioner operates in the second anti-condensation mode.

[0064] For the convenience of explanation, the second outdoor temperature threshold is defined as t 外2 , the second temperature change amplitude threshold is Δt 2 The fourth condition is t 外1 <t 室外 ≤t 外2 , t 盘管 ≤t 管1 , Δt 室内 <Δt 2 If the outdoor temperature t 室外 , coil temperature t 盘管 and the temperature change amplitude Δt 室内 The fourth condition is met, and the air conditioner operates in the second anti-condensation mode. It can be understood that when t 外1 <t 室外 ≤t 外2 When, it represents the current outdoor temperature t 室外 High. Outdoor ambient temperature t 室外 Will affect the indoor ambient temperature 室内 , at outdoor temperature t 室外When the temperature is higher, the dew point temperature of the indoor air will also be higher. At this time, the temperature difference between the surface temperature of the indoor unit coil 300, the surface temperature of the shell 320 and the air outlet and the air dew point temperature will increase. According to the condensation principle, the greater the temperature difference, the easier it is for water vapor to reach the dew point temperature on the low-temperature surface and condense, so the condensation phenomenon will be more serious. When t 盘管 ≤t 管1 When t is t, it means the current coil temperature of the indoor unit coil 300 is t 盘管 Lower, that is, the coil temperature t of the indoor unit coil 300 is 盘管 The temperature difference between the dew point temperature and the air temperature is large, and the condensation phenomenon on the surface of the indoor unit coil 300 is serious. 室内 <Δt 2 When the outdoor temperature is t 室外 , coil temperature t 盘管 and the temperature change amplitude Δt 室内 When the fourth condition is met, it means that the condensation phenomenon generated on the surface of the indoor unit coil 300, the surface of the shell 320 and the air outlet is relatively serious. At this time, the air conditioner needs to run the second anti-condensation mode to suppress the serious condensation phenomenon.

[0065] refer to Figure 6 As an embodiment of the present invention, the running time threshold T 运行 The first relative humidity threshold RH is 10min. 1 The second relative humidity threshold RH is 80% 2 is 90%, the first outdoor temperature threshold t 外1 The second outdoor temperature threshold is 27℃. 外2 The first coil temperature threshold t is 38℃. 管1 is 10℃, the second coil temperature threshold t 管2 The first temperature change threshold Δt is 12°C. 1 The second temperature change amplitude threshold Δt is 4°C. 2 is 3℃.

[0066] The first condition is: 80% ≤ relative humidity RH of the indoor environment 室内 <90%;

[0067] The second condition is: relative humidity RH of the indoor environment 室内 ≥90%;

[0068] The third condition is: the outdoor temperature of the outdoor environment is t 室外 ≤27℃, and 10℃<300℃ coil temperature of indoor unit coil 盘管≤12℃, and the real-time indoor temperature change range Δt 室内 <4℃;

[0069] The fourth condition is: 27℃<outdoor temperature of outdoor environment t 室外 ≤38℃, and the coil temperature of the indoor unit coil is 300℃ 盘管 ≤10℃, and the real-time indoor temperature change range Δt 室内 <3℃.

[0070] The process of the air conditioner anti-condensation control method according to the embodiment of the present invention is roughly as follows:

[0071] When the user starts the cooling mode of the air conditioner, the air conditioner obtains the real-time running time T of the compressor 100. 压缩机 , the air conditioner obtains the real-time indoor temperature of the indoor environment 室内 ;

[0072] When the real-time running time T of the compressor 100 压缩机 = 10min, obtain the coil temperature t of the indoor unit coil 300 盘管 , get the outdoor temperature t of the outdoor environment 室外 , get the relative humidity RH of the indoor environment 室内 , get the temperature change amplitude Δt of the real-time indoor temperature 室内 ;

[0073] Determine RH 室内 Whether the first condition is met, if RH 室内 When the first condition is met, the air conditioner operates in the first anti-condensation mode;

[0074] If RH 室内 If the first condition is not met, judge RH 室内 Whether the second condition is met, if RH 室内 When the second condition is met, the air conditioner operates in the second anti-condensation mode;

[0075] If RH 室内 The second condition is not met, so t 室外 ,t 盘管 and Δt 室内 Whether the third condition is met, if t 室外 ,t 盘管 and Δt 室内 When the third condition is met, the air conditioner operates in the first anti-condensation mode;

[0076] If t 室外 ,t 盘管 and Δt 室内 The third condition is not met, so t 室外 ,t 盘管 and Δt 室内Whether the fourth condition is met, if t 室外 ,t 盘管 and Δt 室内 If the fourth condition is met, the air conditioner operates in the second anti-condensation mode.

[0077] In the embodiment of the present invention, when the user starts the dehumidification mode of the air conditioner, the air conditioner will also enter the judgment process of the anti-condensation control method, which will not be further described here.

[0078] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An air conditioner, characterized in that: include: compressor; Outdoor unit coil; An indoor unit, the indoor unit comprising a shell and an indoor unit coil, a circuit for refrigerant flow is formed between the compressor, the outdoor unit coil and the indoor unit coil; an anti-condensation pipeline, wherein the input end of the anti-condensation pipeline is connected to the output end of the outdoor unit coil, and the output end of the anti-condensation pipeline is connected to the input end of the indoor unit coil, so that part of the refrigerant flowing out of the outdoor unit coil can flow through the anti-condensation pipeline and flow into the indoor unit coil; The anti-condensation pipeline has an anti-condensation section, and the anti-condensation section is arranged on the shell so that the refrigerant in the anti-condensation section can increase the temperature of the shell.

2. The air conditioner according to claim 1, characterized in that: It also includes a first valve, which is arranged on the input end of the anti-condensation pipeline and is used to open or close the anti-condensation pipeline.

3. The air conditioner according to claim 2, characterized in that: It also includes a second valve, which is arranged on the input end of the indoor unit coil. The second valve is used to open or close the input end of the indoor unit coil. The second valve can close the input end of the indoor unit coil so that the refrigerant flowing out of the outdoor unit coil can all flow into the anti-condensation pipeline.

4. The air conditioner according to claim 3, characterized in that: It also includes a throttling element, which is arranged on the circuit, and the throttling element is arranged between the external unit coil and the internal unit coil, and the refrigerant flowing out of the anti-condensation pipeline flows through the throttling element and then flows into the internal unit coil.

5. The air conditioner according to claim 1, characterized in that: It also includes a one-way valve, which is arranged on the output end of the anti-condensation pipeline. The output end of the anti-condensation pipeline is connected to the input end of the indoor unit coil through the one-way valve.

6. The air conditioner according to claim 1, characterized in that: It also includes a flow meter and a regulating valve, which are both arranged on the anti-condensation pipeline so that the refrigerant flows through the flow meter and the regulating valve in sequence and then flows into the anti-condensation section.

7. An air conditioner anti-condensation control method, characterized in that: Applied to the air conditioner as claimed in claim 4, the air conditioner anti-condensation control method comprises: Preset run time threshold; After the air conditioner is started and runs in cooling mode, the real-time running time of the compressor and the real-time indoor temperature of the indoor environment are obtained; After the real-time running time is equal to the running time threshold, obtaining the coil temperature of the indoor unit coil, obtaining the outdoor temperature of the outdoor environment, obtaining the relative humidity of the indoor environment, and obtaining the temperature change amplitude of the real-time indoor temperature; Triggering the air conditioner to operate in a first anti-condensation mode or a second anti-condensation mode according to a comparison result of the relative humidity, the coil temperature, the outdoor temperature and the temperature change amplitude with a set threshold; The first anti-condensation mode is that the first valve and the second valve are kept open at the same time, so that the refrigerant flowing out of the outdoor unit coil can flow into the indoor unit coil and the anti-condensation pipeline; The second anti-condensation mode is that the first valve remains open and the second valve remains closed, so that the refrigerant flowing out of the outdoor unit coil can only flow into the anti-condensation pipeline.

8. The air conditioner anti-condensation control method according to claim 7, characterized in that: Preset a first relative humidity threshold and a second relative humidity threshold, wherein the second relative humidity threshold is greater than the first relative humidity threshold; After the real-time running time is equal to the running time threshold, determining whether the relative humidity satisfies a first condition, the first condition being that the relative humidity is less than the second relative humidity threshold and greater than or equal to the first relative humidity threshold, and if the relative humidity satisfies the first condition, the air conditioner operates in the first anti-condensation mode; If the relative humidity does not meet the first condition, it is determined whether the relative humidity meets the second condition, the second condition being that the relative humidity is greater than or equal to the second relative humidity threshold value. If the relative humidity meets the second condition, the second anti-condensation mode is operated.

9. The air conditioner anti-condensation control method according to claim 8, characterized in that: Preset a first outdoor temperature threshold, a first coil temperature threshold, a second coil temperature threshold and a first temperature change amplitude threshold, wherein the second coil temperature threshold is greater than the first coil temperature threshold; If the relative humidity does not meet the second condition, determine whether the outdoor temperature, the coil temperature and the temperature change amplitude meet a third condition, wherein the third condition is that the outdoor temperature is less than or equal to the first outdoor temperature threshold, the coil temperature is less than or equal to the second coil temperature threshold and greater than the first coil temperature threshold, and the temperature change amplitude is less than the first temperature change amplitude threshold; If the outdoor temperature, the coil temperature and the temperature variation amplitude meet the third condition, the air conditioner operates in the first anti-condensation mode 10. The air conditioner anti-condensation control method according to claim 9, characterized in that: A second outdoor temperature threshold and a second temperature change amplitude threshold are preset, wherein the second outdoor temperature threshold is greater than the first outdoor temperature threshold, and the second temperature change amplitude threshold is less than the first temperature change amplitude threshold; If the outdoor temperature, the coil temperature, and the temperature variation range do not satisfy the third condition, determining whether the outdoor temperature, the coil temperature, and the temperature variation range satisfy a fourth condition, wherein the fourth condition is that the outdoor temperature is less than or equal to the second outdoor temperature threshold and greater than the first outdoor temperature threshold, and the coil temperature is less than or equal to the first coil temperature threshold, and the temperature variation range is less than the second temperature variation range threshold; If the outdoor temperature, the coil temperature, and the temperature variation range satisfy the fourth condition, the air conditioner operates in the second anti-condensation mode.

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