Heat exchanger, air conditioner and control method

Abstract

The application discloses a heat exchanger, an air conditioner and a control method, and through the design of a first heat exchange pipeline, a second heat exchange pipeline and a shunt branch, a third throttling valve is arranged at a first port of the first heat exchange pipeline, a second throttling valve is arranged at a second port of the first heat exchange pipeline, and a fifth throttling valve is arranged in series on the shunt branch; the first heat exchange pipeline can be used as a liquid accumulator, so that the first heat exchange pipeline has a liquid storage function; the liquid storage function can be realized without additionally arranging a liquid accumulator, cost is reduced, and the problem of high cost caused by the arrangement of the liquid accumulator is solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of air conditioning technology, and particularly relates to a heat exchanger, an air conditioner and a control method. BACKGROUND

[0002] During the operation of the air conditioner, the refrigerant quantity is required to be different in the refrigeration and heating states and under different loads, and too much or too little refrigerant quantity will affect the normal operation of the air conditioner.

[0003] Generally, a liquid accumulator is arranged in the air conditioner to store refrigerant, and the system refrigerant is increased or decreased during refrigeration or heating, so that the refrigeration and heating effects are optimal.

[0004] However, the arrangement of the liquid accumulator in the air conditioner not only increases the cost, but also does not meet the requirement of the miniaturization design trend of the shell. SUMMARY

[0005] The present application provides a heat exchanger, which can realize the liquid storage function without arranging a liquid accumulator, thereby reducing the cost.

[0006] To achieve the above technical purpose, the present application adopts the following technical scheme:

[0007] A heat exchanger comprises:

[0008] An air pipe;

[0009] A liquid pipe, which is connected in series with a fourth throttling valve;

[0010] A first heat exchange pipe, which is provided with a third throttling valve at a first port and a second throttling valve at a second port, and is connected with the liquid pipe at the first port;

[0011] A second heat exchange pipe, which is provided with a first throttling valve at a first port and connected with the air pipe at a second port, and the first port of the second heat exchange pipe is connected with the second port of the first heat exchange pipe;

[0012] A shunt branch, which is connected in series with a fifth throttling valve, and the first port of the shunt branch is connected with the liquid pipe, and the second port of the shunt branch is connected with a connection node of the first heat exchange pipe and the second heat exchange pipe.

[0013] In some embodiments of the present application, the first heat exchange pipe comprises a plurality of heat exchange pipes connected in series, and the second heat exchange pipe comprises a plurality of heat exchange pipes connected in series.

[0014] The ratio of the number of heat exchange pipes of the first heat exchange pipe to the number of heat exchange pipes of the second heat exchange pipe is any value between 1 / 4 and 1 / 3.

[0015] An air conditioner comprises:

[0016] A compressor;

[0017] an indoor heat exchanger;

[0018] an outdoor heat exchanger, comprising a gas pipe, a liquid pipe, a first heat exchange pipe, a second heat exchange pipe, and a shunt branch;

[0019] a first port of the first heat exchange pipe is connected with the liquid pipe, a second port of the first heat exchange pipe is connected with a first port of the second heat exchange pipe, and a second port of the second heat exchange pipe is connected with the gas pipe;

[0020] the first port of the second heat exchange pipe is provided with a first throttling valve, the second port of the first heat exchange pipe is provided with a second throttling valve, the first port of the first heat exchange pipe is provided with a third throttling valve, and the liquid pipe is provided with a fourth throttling valve;

[0021] the shunt branch is provided with a fifth throttling valve in series, a first port of the shunt branch is connected with the liquid pipe, and a second port of the shunt branch is connected with a connection node of the first heat exchange pipe and the second heat exchange pipe;

[0022] a controller for controlling the opening degrees of the first throttling valve, the second throttling valve, the third throttling valve, the fourth throttling valve, and the fifth throttling valve.

[0023] In some embodiments of the present application, in the refrigeration mode, the controller is specifically used for:

[0024] when the condensing temperature is within a first set condensing temperature range and the evaporating temperature is within a first set evaporating temperature range, controlling the second throttling valve, the third throttling valve, and the fifth throttling valve to keep the opening degrees;

[0025] when the condensing temperature is less than a lower limit value of the first set condensing temperature range and the evaporating temperature is less than a lower limit value of the first set evaporating temperature range, controlling the fifth throttling valve to be fully open, the second throttling valve to be fully open, and the third throttling valve to decrease the opening degree;

[0026] when the condensing temperature is greater than an upper limit value of the first set condensing temperature range and the evaporating temperature is greater than an upper limit value of the first set evaporating temperature range, controlling the fifth throttling valve to be closed, the second throttling valve to be fully open, and the third throttling valve to increase the opening degree.

[0027] In some embodiments of the present application, in the heating mode, the controller is specifically used for:

[0028] when the condensing temperature is within a second set condensing temperature range and the evaporating temperature is within a second set evaporating temperature range, controlling the second throttling valve, the third throttling valve, and the fifth throttling valve to keep the opening degrees;

[0029] when the condensing temperature is less than the lower limit value of the second set condensing temperature range and the evaporating temperature is less than the lower limit value of the second set evaporating temperature range, controlling the fifth throttling valve to be fully open, the third throttling valve to be fully open, and the second throttling valve to have a reduced opening degree;

[0030] when the condensing temperature is greater than the upper limit value of the second set condensing temperature range and the evaporating temperature is greater than the upper limit value of the second set evaporating temperature range, controlling the fifth throttling valve to be closed, the third throttling valve to be fully open, and the second throttling valve to have an increased opening degree.

[0031] In some embodiments of the present application, in the cooling mode, the temperature of the intermediate heat exchange tube of the outdoor heat exchanger is taken as the condensing temperature, and the temperature of the intermediate heat exchange tube of the indoor heat exchanger is taken as the evaporating temperature.

[0032] In the heating mode, the temperature of the intermediate heat exchange tube of the outdoor heat exchanger is taken as the evaporating temperature, and the temperature of the intermediate heat exchange tube of the indoor heat exchanger is taken as the condensing temperature.

[0033] In some embodiments of the present application, the controller is specifically used for:

[0034] In the cooling mode, the first throttling valve is fully open, and the opening degree of the fourth throttling valve is controlled according to the supercooling degree.

[0035] In the heating mode, the fourth throttling valve is fully open, and the opening degree of the first throttling valve is controlled according to the supercooling degree.

[0036] A control method of an air conditioner, wherein an outdoor heat exchanger of the air conditioner comprises a gas tube, a liquid tube, a first heat exchange tube, a second heat exchange tube, and a shunt branch; a first port of the first heat exchange tube is connected with the liquid tube, a second port of the first heat exchange tube is connected with a first port of the second heat exchange tube, and a second port of the second heat exchange tube is connected with the gas tube; the first port of the second heat exchange tube is provided with a first throttling valve, the second port of the first heat exchange tube is provided with a second throttling valve, the first port of the first heat exchange tube is provided with a third throttling valve, and the outdoor liquid tube is provided with a fourth throttling valve; the shunt branch is provided with a fifth throttling valve in series; a first port of the shunt branch is connected with the liquid tube, and a second port of the shunt branch is connected with a connection node of the first heat exchange tube and the second heat exchange tube.

[0037] The control method comprises:

[0038] obtaining a condensing temperature and an evaporating temperature;

[0039] controlling the opening degrees of the second throttling valve, the third throttling valve, and the fifth throttling valve according to the condensing temperature and the evaporating temperature.

[0040] In some embodiments of the present application, the controlling of the opening degrees of the second throttling valve, the third throttling valve, and the fifth throttling valve according to the condensing temperature and the evaporating temperature specifically comprises:

[0041] in the refrigeration mode,

[0042] when the condensing temperature is in the first set condensing temperature range and the evaporating temperature is in the first set evaporating temperature range, controlling the second throttle valve, the third throttle valve and the fifth throttle valve to keep the opening degree;

[0043] when the condensing temperature is less than the lower limit value of the first set condensing temperature range and the evaporating temperature is less than the lower limit value of the first set evaporating temperature range, controlling the fifth throttle valve to be fully opened, the second throttle valve to be fully opened and the third throttle valve to decrease the opening degree;

[0044] when the condensing temperature is greater than the upper limit value of the first set condensing temperature range and the evaporating temperature is greater than the upper limit value of the first set evaporating temperature range, controlling the fifth throttle valve to be closed, the second throttle valve to be fully opened and the third throttle valve to increase the opening degree.

[0045] In some embodiments of the application, the controlling the opening degree of the second throttle valve, the third throttle valve and the fifth throttle valve according to the condensing temperature and the evaporating temperature specifically comprises:

[0046] in the heating mode,

[0047] when the condensing temperature is in the second set condensing temperature range and the evaporating temperature is in the second set evaporating temperature range, controlling the second throttle valve, the third throttle valve and the fifth throttle valve to keep the opening degree;

[0048] when the condensing temperature is less than the lower limit value of the second set condensing temperature range and the evaporating temperature is less than the lower limit value of the second set evaporating temperature range, controlling the fifth throttle valve to be fully opened, the third throttle valve to be fully opened and the second throttle valve to decrease the opening degree;

[0049] when the condensing temperature is greater than the upper limit value of the second set condensing temperature range and the evaporating temperature is greater than the upper limit value of the second set evaporating temperature range, controlling the fifth throttle valve to be closed, the third throttle valve to be fully opened and the second throttle valve to increase the opening degree.

[0050] Compared with the prior art, the heat exchanger, the air conditioner and the control method have the advantages and positive effects that: the first heat exchange pipeline, the second heat exchange pipeline and the shunt branch are designed, the third throttle valve is arranged at the first port of the first heat exchange pipeline, the second throttle valve is arranged at the second port of the first heat exchange pipeline, and the fifth throttle valve is arranged in series on the shunt branch; the first heat exchange pipeline can be used as a liquid accumulator, so that the first heat exchange pipeline has a liquid storage function; the liquid storage function is realized without additionally arranging a liquid accumulator, the cost is reduced, and the problem of high cost caused by arranging the liquid accumulator is solved.

[0051] Other features and advantages of the application will become more apparent after reading the detailed description of the embodiments of the application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort based on these drawings.

[0053] Figure 1 is a structural schematic diagram of an embodiment of the heat exchanger proposed by the present application;

[0054] Figure 2 is a structural schematic diagram of an embodiment of the air conditioner proposed by the present application;

[0055] Figure 3 is a flow chart of an embodiment of the air conditioner control method proposed by the present application.

[0056] Reference signs:

[0057] 10, heat exchanger; 11, gas pipe; 12, liquid pipe; 13, shunt branch;

[0058] 14, first heat exchange pipe; 15, second heat exchange pipe;

[0059] 20, indoor heat exchanger; 21, gas pipe; 22, liquid pipe;

[0060] 30, reversing valve. DETAILED DESCRIPTION

[0061] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the scope of protection of the present application.

[0062] In the description of the present application, it should be understood that the terms “center”, “upper”, “lower”, “front”, “back”, “top”, “bottom”, “inner”, “outer” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0063] In the description of the application, it is necessary to understand that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can be explicitly or implicitly included one or more features. In the description of the application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0064] In the description of the application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0065] In view of the technical problem of high cost of air conditioner caused by setting the liquid accumulator, the application provides a heat exchanger, air conditioner and control method, which can realize the liquid storage function without setting the liquid accumulator, thereby reducing the cost and solving the problem of high cost of air conditioner caused by setting the liquid accumulator. In the following, the heat exchanger, air conditioner and control method of the application will be described in detail in combination with the drawings.

[0066] Embodiment one,

[0067] The heat exchanger 10 of the embodiment includes a gas pipe 11, a liquid pipe 12, a first heat exchange pipe 14, a second heat exchange pipe 15, a shunt branch 13, etc., as shown in Figure 1 .

[0068] The liquid pipe 12 is connected in series with a fourth throttling valve V4.

[0069] The first heat exchange pipe 14 has a first port and a second port; the first port of the first heat exchange pipe 14 is provided with a third throttling valve V3, and the second port of the first heat exchange pipe 14 is provided with a second throttling valve V2; the first port of the first heat exchange pipe 14 is connected with the liquid pipe 12.

[0070] The second heat exchange pipe 15 has a first port and a second port; the first port of the second heat exchange pipe 15 is provided with a first throttling valve V1, and the second port of the second heat exchange pipe 15 is connected with the gas pipe 11; the first port of the second heat exchange pipe 15 is connected with the second port of the first heat exchange pipe 14.

[0071] The shunt branch 13 has a first port and a second port, and the fifth throttling valve V5 is connected in series on the shunt branch 13. The first port of the shunt branch 13 is connected with the liquid pipe 12, and the second port of the shunt branch 13 is connected with the connecting node of the first heat exchange pipe 14 and the second heat exchange pipe 15.

[0072] The heat exchanger of the embodiment has the first heat exchange pipe 14 connected in series with the second heat exchange pipe 15, and the shunt branch 13 connected in series with the second heat exchange pipe 15, and the shunt branch 13 connected in parallel with the second throttling valve V2, the first heat exchange pipe 14 and the third throttling valve V3.

[0073] When the refrigerant enters the heat exchanger 10 from the gas pipe 11, the refrigerant in the gas pipe 11 enters the second heat exchange pipe 15, and the refrigerant flowing out of the second heat exchange pipe 15 is divided into two paths, one of which enters the shunt branch 13, and the other of which enters the first heat exchange pipe 14, and then the refrigerant in the two paths converges into the liquid pipe 12.

[0074] When the refrigerant enters the heat exchanger 10 from the liquid pipe 12, the refrigerant flowing out of the liquid pipe 12 is divided into two paths, one of which enters the shunt branch 13, and the other of which enters the first heat exchange pipe 14, and then the refrigerant in the two paths converges into the second heat exchange pipe 15, and then flows into the gas pipe 11 from the second heat exchange pipe 15.

[0075] By controlling the opening degrees of the second throttling valve V2 and the third throttling valve V3, the refrigerant can be stored in the first heat exchange pipe 14, so that the first heat exchange pipe 14 has a liquid storage function, that is, the heat exchanger 10 has a liquid storage function.

[0076] When the refrigerant enters the heat exchanger 10 from the gas pipe 11, if it is desired to reduce the amount of refrigerant participating in circulation, the fifth throttling valve V5 is fully opened, the second throttling valve V2 is fully opened, and the opening degree of the third throttling valve V3 is reduced, that is, the amount of refrigerant flowing out of the first heat exchange pipe 14 is less than the amount of refrigerant flowing into the first heat exchange pipe 14, and the refrigerant is stored in the first heat exchange pipe 14. If it is desired to increase the amount of refrigerant participating in circulation, the fifth throttling valve V5 is closed, the second throttling valve V2 is fully opened, and the opening degree of the third throttling valve V3 is increased, that is, the amount of refrigerant flowing out of the first heat exchange pipe 14 gradually increases. The first throttling valve V1 is fully opened, and the opening degree of the fourth throttling valve V4 is controlled according to the supercooling degree.

[0077] When the refrigerant enters the heat exchanger 10 from the liquid pipe 12, if it is desired to reduce the amount of refrigerant participating in the cycle, the fifth throttle valve V5 is fully opened, the third throttle valve V3 is fully opened, and the opening degree of the second throttle valve V2 is reduced, that is, the amount of refrigerant flowing out of the first heat exchange pipeline 14 is less than the amount of refrigerant flowing into the first heat exchange pipeline 14, and the first heat exchange pipeline 14 stores the refrigerant. If it is desired to increase the amount of refrigerant participating in the cycle, the fifth throttle valve V5 is closed, the third throttle valve V3 is fully opened, and the opening degree of the second throttle valve V2 is increased, that is, the amount of refrigerant flowing out of the first heat exchange pipeline 14 is gradually increased. The fourth throttle valve V4 is fully opened, and the opening degree of the first throttle valve V1 is controlled according to the supercooling degree.

[0078] The heat exchanger of the embodiment can be used as an outdoor heat exchanger or an indoor heat exchanger when applied to an air conditioner.

[0079] In some embodiments of the present application, the first heat exchange pipeline 14 includes a plurality of heat exchange pipes connected in series, and the second heat exchange pipeline 15 includes a plurality of heat exchange pipes connected in series. The ratio of the number of heat exchange pipes of the first heat exchange pipeline 14 to the number of heat exchange pipes of the second heat exchange pipeline 15 is any value between 1 / 4 and 1 / 3.

[0080] The number of heat exchange pipes of the first heat exchange pipeline 14 is n1, the number of heat exchange pipes of the second heat exchange pipeline 15 is n2, and the ratio of the number of heat exchange pipes n1 of the first heat exchange pipeline 14 to the number of heat exchange pipes n2 of the second heat exchange pipeline 15 is R. The ratio R = n1 / n2.

[0081] When the first heat exchange pipeline 14 is used as a liquid accumulator, its heat exchange function will be weakened, which will affect the heat exchange function of the entire heat exchanger 10. If the ratio R is too large, when the first heat exchange pipeline 14 is used as a liquid accumulator, it will have a greater impact on the heat exchange function of the entire heat exchanger 10. If the ratio R is too small, the liquid accumulation function of the first heat exchange pipeline 14 will be weakened. Therefore, in the embodiment, the ratio R is any value between 1 / 4 and 1 / 3, which not only satisfies the liquid accumulation function of the first heat exchange pipeline 14, but also avoids having a greater impact on the heat exchange function of the entire heat exchanger.

[0082] The heat exchanger of the embodiment can be used as an outdoor heat exchanger or an indoor heat exchanger when applied to an air conditioner.

[0083] Embodiment two,

[0084] Based on the design of the heat exchanger in embodiment one, this embodiment two proposes an air conditioner, which includes the heat exchanger in embodiment one. The heat exchanger in embodiment one is used as the outdoor heat exchanger of the air conditioner.

[0085] The air conditioner in this embodiment includes a compressor, a reversing valve 30, an indoor heat exchanger 20, an outdoor heat exchanger 10, a controller, etc., as shown in the figure. Figure 2

[0086] The indoor heat exchanger 20 has a gas pipe 21 and a liquid pipe 22.

[0087] The outdoor heat exchanger 10 includes a gas pipe 11, a liquid pipe 12, a first heat exchange pipe 14, a second heat exchange pipe 15, and a shunt branch 13. The liquid pipe 12 is connected to the liquid pipe 22, the gas pipe 11 is connected to the reversing valve 30, and the gas pipe 21 is connected to the reversing valve 30.

[0088] The first heat exchange pipe 14 has a first port and a second port. The first port of the first heat exchange pipe 14 is connected to the liquid pipe 12, the second port of the first heat exchange pipe 14 is connected to the first port of the second heat exchange pipe 15, and the second port of the second heat exchange pipe 15 is connected to the gas pipe 11.

[0089] The second heat exchange pipe 15 has a first port and a second port. The first port of the second heat exchange pipe 15 is provided with a first throttle valve V1, the second port of the first heat exchange pipe 14 is provided with a second throttle valve V2, the first port of the first heat exchange pipe 14 is provided with a third throttle valve V3, and the liquid pipe 12 is provided with a fourth throttle valve V4.

[0090] The shunt branch 13 has a first port and a second port. The shunt branch 13 is connected in series with a fifth throttle valve V5; the first port of the shunt branch 13 is connected to the liquid pipe 12, and the second port of the shunt branch 13 is connected to the connection node of the first heat exchange pipe 14 and the second heat exchange pipe 15.

[0091] The controller is used to control the opening degrees of the first throttle valve V1, the second throttle valve V2, the third throttle valve V3, the fourth throttle valve V4, and the fifth throttle valve V5.

[0092] The outdoor heat exchanger 10 in this embodiment has the first heat exchange pipe 14 connected in series with the second heat exchange pipe 15, the shunt branch 13 connected in series with the second heat exchange pipe 15, and the shunt branch 13 connected in parallel with the second throttle valve V2, the first heat exchange pipe 14, and the third throttle valve V3.

[0093] ​In the refrigeration cycle, the high-temperature and high-pressure gaseous refrigerant discharged by the compressor enters the outdoor heat exchanger 10 through the reversing valve 30, the refrigerant flowing out of the outdoor heat exchanger 10 enters the indoor heat exchanger 20, and the refrigerant flowing out of the indoor heat exchanger 20 flows back to the compressor through the reversing valve 30. In the refrigeration cycle, the refrigerant enters the outdoor heat exchanger 10 from the gas pipe 11, and the refrigerant in the gas pipe 11 enters the second heat exchange pipe 15. The refrigerant flowing out of the second heat exchange pipe 15 is divided into two paths, one path of the refrigerant enters the branch pipe 13, and the other path of the refrigerant enters the first heat exchange pipe 14, and then the two paths of the refrigerant converge to the liquid pipe 12.

[0094] In the heating cycle, the high-temperature and high-pressure gaseous refrigerant discharged by the compressor enters the indoor heat exchanger 20 through the reversing valve 30, the refrigerant flowing out of the indoor heat exchanger 20 enters the outdoor heat exchanger 10, and the refrigerant flowing out of the outdoor heat exchanger 10 flows back to the compressor through the reversing valve 30. In the heating cycle, the refrigerant enters the outdoor heat exchanger 10 from the liquid pipe 12, and the refrigerant flowing out of the liquid pipe 12 is divided into two paths, one path of the refrigerant enters the branch pipe 13, and the other path of the refrigerant enters the first heat exchange pipe 14, and then the two paths of the refrigerant converge to the second heat exchange pipe 15, and then flow into the gas pipe 11 from the second heat exchange pipe 15.

[0095] By controlling the opening degrees of the second throttle valve V2 and the third throttle valve V3, the refrigerant can be stored in the first heat exchange pipe 14, and the first heat exchange pipe 14 has a liquid storage function, that is, the outdoor heat exchanger has a liquid storage function.

[0096] The air conditioner of the embodiment has the first heat exchange pipe 14, the second heat exchange pipe 15, and the branch pipe 13 designed in the outdoor heat exchanger 10, the first port of the first heat exchange pipe 14 is provided with the third throttle valve V3, the second port of the first heat exchange pipe 14 is provided with the second throttle valve V2, and the fifth throttle valve V5 is connected in series on the branch pipe 13; the first heat exchange pipe 14 can be used as a liquid accumulator, so that the outdoor heat exchanger 10 has a liquid storage function; the air conditioner of the embodiment does not need to additionally provide a liquid accumulator to realize the liquid storage function, thereby reducing the cost of the air conditioner and solving the problem of high cost of the air conditioner caused by providing the liquid accumulator.

[0097] The sizes of the condensation temperature and the evaporation temperature can reflect whether the circulating refrigerant amount in the air conditioner is too much or too little, and therefore the circulating refrigerant amount in the air conditioner can be judged by monitoring the sizes of the condensation temperature and the evaporation temperature.

[0098] In some embodiments of the present application, in the refrigeration mode, the controller is specifically configured to perform the following control:

[0099] (1) When the condensing temperature is in the first set condensing temperature range and the evaporating temperature is in the first set evaporating temperature range, it indicates that the refrigerant circulating in the air conditioner is appropriate, and the refrigerant amount is in the set range, so the second throttle valve V2, the third throttle valve V3 and the fifth throttle valve V5 are controlled to keep the opening degree.

[0100] (2) When the condensing temperature is less than the lower limit value of the first set condensing temperature range and the evaporating temperature is less than the lower limit value of the first set evaporating temperature range, it indicates that the refrigerant circulating in the air conditioner is more, so the fifth throttle valve V5 is controlled to be fully opened, the second throttle valve V2 is controlled to be fully opened, and the opening degree of the third throttle valve V3 is reduced; that is, the refrigerant flowing out of the first heat exchange pipeline 14 is less than the refrigerant flowing into the first heat exchange pipeline 14, and part of the refrigerant is stored in the first heat exchange pipeline 14 to reduce the refrigerant circulating in the air conditioner.

[0101] (3) When the condensing temperature is greater than the upper limit value of the first set condensing temperature range and the evaporating temperature is greater than the upper limit value of the first set evaporating temperature range, it indicates that the refrigerant circulating in the air conditioner is less, so the fifth throttle valve V5 is controlled to be closed, the second throttle valve V2 is controlled to be fully opened, and the opening degree of the third throttle valve V3 is increased; that is, the refrigerant flowing out of the first heat exchange pipeline 14 is gradually increased to increase the refrigerant circulating in the air conditioner.

[0102] By controlling the opening degrees of the fifth throttle valve V5, the second throttle valve V2 and the third throttle valve V3 in the refrigeration mode, the refrigerant circulating amount in the air conditioner is adjusted to ensure the normal refrigeration operation of the air conditioner, and the control is simple and easy to implement.

[0103] In some embodiments of the application, in the heating mode, the controller is specifically configured to perform the following control:

[0104] (1) When the condensing temperature is in the second set condensing temperature range and the evaporating temperature is in the second set evaporating temperature range, it indicates that the refrigerant circulating in the air conditioner is appropriate, and the refrigerant amount is in the set range, so the second throttle valve V2, the third throttle valve V3 and the fifth throttle valve V5 are controlled to keep the opening degree.

[0105] (2) When the condensing temperature is less than the lower limit value of the second set condensing temperature range and the evaporating temperature is less than the lower limit value of the second set evaporating temperature range, it indicates that the refrigerant circulating in the air conditioner is more, so the fifth throttle valve V5 is controlled to be fully opened, the third throttle valve V3 is controlled to be fully opened, and the opening degree of the second throttle valve V2 is reduced; that is, the refrigerant flowing out of the first heat exchange pipeline 14 is less than the refrigerant flowing into the first heat exchange pipeline 14, and part of the refrigerant is stored in the first heat exchange pipeline 14 to reduce the refrigerant circulating in the air conditioner.

[0106] (3) When the condensing temperature is greater than the upper limit of the second set condensing temperature range and the evaporating temperature is greater than the upper limit of the second set evaporating temperature range, it indicates that the refrigerant circulating in the air conditioner is less, and the fifth throttling valve V5 is controlled to be closed, the third throttling valve V3 is controlled to be fully opened, and the opening of the second throttling valve V2 is increased; that is, the amount of refrigerant flowing out of the first heat exchange pipeline 14 is gradually increased to increase the amount of refrigerant circulating in the air conditioner.

[0107] By controlling the opening of the fifth throttling valve V5, the second throttling valve V2 and the third throttling valve V3 in the heating mode, the refrigerant circulating amount in the air conditioner is adjusted to ensure normal heating operation of the air conditioner, and the control is simple and easy to implement.

[0108] In the present application, the condensing temperature T C , the evaporating temperature T e ;

[0109] The first set condensing temperature range is T C0 ~T C1 , the lower limit of the first set condensing temperature range T C0 , the upper limit of the first set condensing temperature range T C1 , T C0 <T C1 ;

[0110] The second set condensing temperature range is T C2 ~T C3 , the lower limit of the second set condensing temperature range T C2 , the upper limit of the second set condensing temperature range T C3 , T C2 <T C3 ;

[0111] The first set evaporating temperature range is T e0 ~T e1 , the lower limit of the first set evaporating temperature range T e0 , the upper limit of the first set evaporating temperature range T e1 , T e0 <T e1 ;

[0112] The second set evaporating temperature range is T e2 ~T e3 , the lower limit of the second set evaporating temperature range T e2 , the upper limit of the second set evaporating temperature range T e3 , T e2 <T e3 .

[0113] In some embodiments of the present application, in the cooling mode, the temperature of the intermediate heat exchange tube of the outdoor heat exchanger 10 is taken as the condensing temperature, and the temperature of the intermediate heat exchange tube of the indoor heat exchanger 20 is taken as the evaporating temperature, so as to simplify the obtaining process of the condensing temperature and the evaporating temperature.

[0114] In some embodiments of the present application, in the heating mode, the temperature of the intermediate heat exchange tube of the outdoor heat exchanger 10 is taken as the evaporating temperature, and the temperature of the intermediate heat exchange tube of the indoor heat exchanger 20 is taken as the condensing temperature, so as to simplify the obtaining process of the condensing temperature and the evaporating temperature.

[0115] In some embodiments of the present application, the controller is specifically used for performing the following control:

[0116] In the cooling mode, the first throttling valve V1 is fully opened to ensure that the refrigerant in the second heat exchange tube 15 flows out smoothly; the fourth throttling valve V4 is used for throttling the entire air conditioner, and the opening degree of the fourth throttling valve V4 is controlled according to the supercooling degree, so that the refrigerant flowing from the liquid tube 12 to the indoor heat exchanger 20 becomes low-temperature and low-pressure liquid refrigerant, and the normal cooling operation of the air conditioner is ensured.

[0117] In the heating mode, the fourth throttling valve V4 is fully opened to ensure that the refrigerant in the liquid tube 12 flows to the outdoor heat exchanger 10 smoothly; the first throttling valve V1 is used for throttling the entire air conditioner, and the opening degree of the first throttling valve V1 is controlled according to the supercooling degree, so that the refrigerant entering the second heat exchange tube 15 is low-temperature and low-pressure liquid refrigerant, and the normal heating operation of the air conditioner is ensured.

[0118] The air conditioner of the present embodiment adjusts the opening degree of the corresponding throttling valve, so that the first heat exchange tube 14 of the outdoor heat exchanger 10 has a liquid storage function, stores part of the refrigerant, adjusts the amount of refrigerant circulating in the air conditioner, and meets the refrigerant amount demand under different working conditions; without the need to additionally set a liquid accumulator, the installation space is saved, and the cost of the air conditioner is reduced.

[0119] Embodiment three,

[0120] Based on the design of the air conditioner of embodiment two, the present embodiment three proposes an air conditioner control method.

[0121] The air conditioner comprises a compressor, a reversing valve 30, an indoor heat exchanger 20, an outdoor heat exchanger 10, a controller, etc., as shown in Figure 2 .

[0122] The outdoor heat exchanger 10 includes a gas pipe 11, a liquid pipe 12, a first heat exchange pipe 14, a second heat exchange pipe 15, and a shunt branch 13. The first port of the first heat exchange pipe 14 is connected to the liquid pipe 12, the second port of the first heat exchange pipe 14 is connected to the first port of the second heat exchange pipe 15, and the second port of the second heat exchange pipe 15 is connected to the gas pipe 11. The first port of the second heat exchange pipe 15 is provided with a first throttling valve V1, the second port of the first heat exchange pipe 14 is provided with a second throttling valve V2, the first port of the first heat exchange pipe 14 is provided with a third throttling valve V3, and the liquid pipe 12 is provided with a fourth throttling valve V4. The shunt branch 13 is connected in series with a fifth throttling valve V5, the first port of the shunt branch 13 is connected to the liquid pipe 12, and the second port of the shunt branch 13 is connected to the connection node of the first heat exchange pipe 14 and the second heat exchange pipe 15.

[0123] The specific structure design of the air conditioner is described in Embodiment Two, which will not be repeated here.

[0124] The air conditioner control method of the embodiment mainly includes the following steps, which are described with reference to Figure 3 .

[0125] Step S1: Obtain the condensation temperature and the evaporation temperature.

[0126] Step S2: Control the opening degrees of the second throttling valve V2, the third throttling valve V3, and the fifth throttling valve V5 according to the obtained condensation temperature and evaporation temperature, so that the circulating refrigerant amount in the air conditioner is within the set range, and the normal operation of the air conditioner is ensured.

[0127] The air conditioner control method of the embodiment, by designing the first heat exchange pipe 14, the second heat exchange pipe 15, and the shunt branch 13 in the outdoor heat exchanger 10 of the air conditioner, the first port of the first heat exchange pipe 14 is provided with the third throttling valve V3, and the second port of the first heat exchange pipe 14 is provided with the second throttling valve V2; the shunt branch 13 is connected in series with the fifth throttling valve V5; the opening degrees of the second throttling valve V2, the third throttling valve V3, and the fifth throttling valve V5 are controlled according to the obtained condensation temperature and evaporation temperature, so that the circulating refrigerant amount in the air conditioner is within the set range, and the normal operation of the air conditioner is ensured; the first heat exchange pipe 14 of the outdoor heat exchanger 10 can be used as a liquid accumulator, so that the outdoor heat exchanger 10 has a liquid storage function, and a liquid accumulator does not need to be additionally provided to achieve the liquid storage function, thereby reducing the cost of the air conditioner and solving the problem of high cost of the air conditioner caused by the provision of the liquid accumulator.

[0128] Because the circulating refrigerant amount required by the air conditioner is different in the refrigeration mode and the heating mode, the set range includes a first set refrigerant amount range and a second set refrigerant amount range.

[0129] In some embodiments of the present application, the opening degrees of the second throttle valve V2, the third throttle valve V3 and the fifth throttle valve V5 are controlled according to the condensing temperature and the evaporating temperature, specifically including the following steps:

[0130] In the cooling mode,

[0131] (2-1) When the condensing temperature is within the first set condensing temperature range and the evaporating temperature is within the first set evaporating temperature range, it indicates that the refrigerant circulating in the air conditioner is appropriate, and the refrigerant amount is within the first set refrigerant amount range, so the opening degrees of the second throttle valve V2, the third throttle valve V3 and the fifth throttle valve V5 are maintained.

[0132] (2-2) When the condensing temperature is less than the lower limit value of the first set condensing temperature range and the evaporating temperature is less than the lower limit value of the first set evaporating temperature range, it indicates that the refrigerant circulating in the air conditioner is too much, so the fifth throttle valve V5 is fully opened, the second throttle valve V2 is fully opened, and the opening degree of the third throttle valve V3 is reduced; that is, the refrigerant flowing out of the first heat exchange pipeline 14 is less than the refrigerant flowing into the first heat exchange pipeline 14, and part of the refrigerant is stored in the first heat exchange pipeline 14 to reduce the refrigerant circulating in the air conditioner.

[0133] (2-3) When the condensing temperature is greater than the upper limit value of the first set condensing temperature range and the evaporating temperature is greater than the upper limit value of the first set evaporating temperature range, it indicates that the refrigerant circulating in the air conditioner is too little, so the fifth throttle valve V5 is closed, the second throttle valve V2 is fully opened, and the opening degree of the third throttle valve V3 is increased; that is, the refrigerant flowing out of the first heat exchange pipeline 14 is gradually increased to increase the refrigerant circulating in the air conditioner.

[0134] By controlling the opening degrees of the fifth throttle valve V5, the second throttle valve V2 and the third throttle valve V3 in the cooling mode, the refrigerant circulating amount in the air conditioner is adjusted, so that the refrigerant circulating in the air conditioner is within the set range, ensuring the normal cooling operation of the air conditioner, and the control is simple and easy to implement.

[0135] In some embodiments of the present application, the opening degrees of the second throttle valve V2, the third throttle valve V3 and the fifth throttle valve V5 are controlled according to the condensing temperature and the evaporating temperature, specifically including the following steps:

[0136] In the heating mode,

[0137] (2-4) When the condensing temperature is within the second set condensing temperature range and the evaporating temperature is within the second set evaporating temperature range, it indicates that the refrigerant circulating in the air conditioner is appropriate, and the refrigerant amount is within the second set refrigerant amount range, so the opening degrees of the second throttle valve V2, the third throttle valve V3 and the fifth throttle valve V5 are maintained.

[0138] (2-5) When the condensing temperature is less than the lower limit value of the second set condensing temperature range and the evaporating temperature is less than the lower limit value of the second set evaporating temperature range, it indicates that the refrigerant circulating in the air conditioner is too much, and the fifth throttling valve V5 is controlled to be fully opened, the third throttling valve V3 is controlled to be fully opened, and the opening degree of the second throttling valve V2 is reduced; that is, the refrigerant flowing out of the first heat exchange pipeline 14 is less than the refrigerant flowing into the first heat exchange pipeline 14, and part of the refrigerant is stored in the first heat exchange pipeline 14, so as to reduce the refrigerant circulating in the air conditioner.

[0139] (2-6) When the condensing temperature is greater than the upper limit value of the second set condensing temperature range and the evaporating temperature is greater than the upper limit value of the second set evaporating temperature range, it indicates that the refrigerant circulating in the air conditioner is too little, and the fifth throttling valve V5 is controlled to be closed, the third throttling valve V3 is controlled to be fully opened, and the opening degree of the second throttling valve V2 is increased; that is, the refrigerant flowing out of the first heat exchange pipeline 14 is gradually increased, so as to increase the refrigerant circulating in the air conditioner.

[0140] By controlling the opening degrees of the fifth throttling valve V5, the second throttling valve V2 and the third throttling valve V3 in the heating mode, the refrigerant circulating amount in the air conditioner is adjusted, so that the refrigerant circulating in the air conditioner is within the set range, and the air conditioner is ensured to operate normally in heating mode, and the control is simple and easy to implement.

[0141] In the cooling mode, the first throttling valve V1 is fully opened to ensure that the refrigerant in the second heat exchange pipeline 15 flows out smoothly; the fourth throttling valve V4 is used for throttling the entire air conditioner, and the opening degree of the fourth throttling valve V4 is controlled according to the supercooling degree, so that the refrigerant flowing from the liquid pipe 12 to the indoor heat exchanger 20 becomes low-temperature and low-pressure liquid refrigerant, and the air conditioner is ensured to operate normally in cooling mode.

[0142] In the heating mode, the fourth throttling valve V4 is fully opened to ensure that the refrigerant in the liquid pipe 12 flows to the outdoor heat exchanger 10 smoothly; the first throttling valve V1 is used for throttling the entire air conditioner, and the opening degree of the first throttling valve V1 is controlled according to the supercooling degree, so that the refrigerant entering the second heat exchange pipeline 15 is low-temperature and low-pressure liquid refrigerant, and the air conditioner is ensured to operate normally in heating mode.

[0143] The air conditioner control method of the embodiment adjusts the opening degrees of the corresponding throttling valves, so that the first heat exchange pipeline 14 of the outdoor heat exchanger 10 has a liquid storage function, stores part of the refrigerant, adjusts the refrigerant circulating amount in the air conditioner, and meets the refrigerant amount demand under different working conditions; without additionally setting a liquid accumulator, installation space is saved, and the cost of the air conditioner is reduced.

[0144] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; and although the present application has been described in detail with reference to the foregoing embodiments, it should be appreciated by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An air conditioner characterized by comprising: Comprise: Compressor; Indoor heat exchanger; Outdoor heat exchanger, comprising gas pipe, liquid pipe, first heat exchange pipeline, second heat exchange pipeline, shunt branch; The first port of the first heat exchange pipeline is connected with the liquid pipe, the second port of the first heat exchange pipeline is connected with the first port of the second heat exchange pipeline, and the second port of the second heat exchange pipeline is connected with the gas pipe; The first port of the second heat exchange pipeline is provided with a first throttling valve, the second port of the first heat exchange pipeline is provided with a second throttling valve, the first port of the first heat exchange pipeline is provided with a third throttling valve, and the liquid pipe is provided with a fourth throttling valve; The shunt branch is provided with a fifth throttling valve in series, the first port of the shunt branch is connected with the liquid pipe, and the second port of the shunt branch is connected with the connection node of the first heat exchange pipeline and the second heat exchange pipeline; The controller is used for controlling the opening degree of the first throttling valve, the second throttling valve, the third throttling valve, the fourth throttling valve and the fifth throttling valve; In the refrigeration mode, the controller is specifically used for: When the condensing temperature is in the first set condensing temperature range and the evaporation temperature is in the first set evaporation temperature range, controlling the second throttling valve, the third throttling valve and the fifth throttling valve to keep the opening degree; When the condensing temperature is less than the lower limit value of the first set condensing temperature range and the evaporation temperature is less than the lower limit value of the first set evaporation temperature range, controlling the fifth throttling valve to be fully opened, the second throttling valve to be fully opened and the third throttling valve to reduce the opening degree; When the condensing temperature is greater than the upper limit value of the first set condensing temperature range and the evaporation temperature is greater than the upper limit value of the first set evaporation temperature range, controlling the fifth throttling valve to be closed, the second throttling valve to be fully opened and the third throttling valve to increase the opening degree.

2. The air conditioner of claim 1, wherein: In the heating mode, the controller is specifically used for: When the condensing temperature is in the second set condensing temperature range and the evaporation temperature is in the second set evaporation temperature range, controlling the second throttling valve, the third throttling valve and the fifth throttling valve to keep the opening degree; When the condensing temperature is less than the lower limit value of the second set condensing temperature range and the evaporation temperature is less than the lower limit value of the second set evaporation temperature range, controlling the fifth throttling valve to be fully opened, the third throttling valve to be fully opened and the second throttling valve to reduce the opening degree; When the condensing temperature is greater than the upper limit value of the second set condensing temperature range and the evaporation temperature is greater than the upper limit value of the second set evaporation temperature range, controlling the fifth throttling valve to be closed, the third throttling valve to be fully opened and the second throttling valve to increase the opening degree.

3. The air conditioner control method according to claim 1 or 2, wherein: In the refrigeration mode, the temperature of the intermediate heat exchange pipe in the outdoor heat exchanger is taken as the condensing temperature, and the temperature of the intermediate heat exchange pipe in the indoor heat exchanger is taken as the evaporation temperature; In the heating mode, the temperature of the intermediate heat exchange pipe in the outdoor heat exchanger is taken as the evaporation temperature, and the temperature of the intermediate heat exchange pipe in the indoor heat exchanger is taken as the condensing temperature.

4. The air conditioner of claim 1, wherein: The controller is specifically used for: In the refrigeration mode, the first throttling valve is fully opened, and the opening degree of the fourth throttling valve is controlled according to the supercooling degree; In the heating mode, the fourth throttling valve is fully opened, and the opening degree of the first throttling valve is controlled according to the supercooling degree.

5. The air conditioner of claim 1, wherein: The first heat exchange pipeline comprises a plurality of heat exchange pipes connected in series, and the second heat exchange pipeline comprises a plurality of heat exchange pipes connected in series. The ratio of the number of heat exchange tubes of the first heat exchange tube line to the number of heat exchange tubes of the second heat exchange tube line is any value between 1 / 4 and 1 / 3.

6. An air conditioner control method characterized by comprising: The outdoor heat exchanger of the air conditioner comprises a gas pipe, a liquid pipe, a first heat exchange tube line, a second heat exchange tube line, and a shunt branch; a first port of the first heat exchange tube line is connected to the liquid pipe, a second port of the first heat exchange tube line is connected to a first port of the second heat exchange tube line, and a second port of the second heat exchange tube line is connected to the gas pipe; the first port of the second heat exchange tube line is provided with a first throttling valve, the second port of the first heat exchange tube line is provided with a second throttling valve, the first port of the first heat exchange tube line is provided with a third throttling valve, and the outdoor liquid pipe is provided with a fourth throttling valve; the shunt branch is provided with a fifth throttling valve in series; a first port of the shunt branch is connected to the liquid pipe, and a second port of the shunt branch is connected to a connection node of the first heat exchange tube line and the second heat exchange tube line; The control method comprises: obtaining a condensing temperature and an evaporating temperature; controlling the opening degrees of the second throttling valve, the third throttling valve, and the fifth throttling valve according to the condensing temperature and the evaporating temperature; The control of the opening degrees of the second throttling valve, the third throttling valve, and the fifth throttling valve according to the condensing temperature and the evaporating temperature specifically comprises: in the cooling mode, when the condensing temperature is within a first set condensing temperature range and the evaporating temperature is within a first set evaporating temperature range, the second throttling valve, the third throttling valve, and the fifth throttling valve are controlled to keep the opening degrees; when the condensing temperature is less than the lower limit value of the first set condensing temperature range and the evaporating temperature is less than the lower limit value of the first set evaporating temperature range, the fifth throttling valve is controlled to be fully open, the second throttling valve is controlled to be fully open, and the opening degree of the third throttling valve is reduced; when the condensing temperature is greater than the upper limit value of the first set condensing temperature range and the evaporating temperature is greater than the upper limit value of the first set evaporating temperature range, the fifth throttling valve is controlled to be closed, the second throttling valve is controlled to be fully open, and the opening degree of the third throttling valve is increased.

7. The air conditioner control method of claim 6, wherein: The control of the opening degrees of the second throttling valve, the third throttling valve, and the fifth throttling valve according to the condensing temperature and the evaporating temperature specifically comprises: in the heating mode, when the condensing temperature is within a second set condensing temperature range and the evaporating temperature is within a second set evaporating temperature range, the second throttling valve, the third throttling valve, and the fifth throttling valve are controlled to keep the opening degrees; when the condensing temperature is less than the lower limit value of the second set condensing temperature range and the evaporating temperature is less than the lower limit value of the second set evaporating temperature range, the fifth throttling valve is controlled to be fully open, the third throttling valve is controlled to be fully open, and the opening degree of the second throttling valve is reduced; when the condensing temperature is greater than the upper limit value of the second set condensing temperature range and the evaporating temperature is greater than the upper limit value of the second set evaporating temperature range, the fifth throttling valve is controlled to be closed, the third throttling valve is controlled to be fully open, and the opening degree of the second throttling valve is increased.

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