An air conditioner indoor heat exchanger, an air conditioner and a control method

Abstract

The application discloses an air conditioner indoor heat exchanger, an air conditioner and a control method. The air conditioner indoor heat exchanger comprises a gas pipe, a liquid pipe, a rear-row heat exchanger, a front-row heat exchanger and a shunt pipeline. The first inlet and outlet liquid port of the rear-row heat exchanger is connected with the liquid pipe. The first inlet and outlet liquid port of the rear-row heat exchanger is provided with a first valve. The inlet and outlet liquid port of the front-row heat exchanger is connected with the second inlet and outlet liquid port of the rear-row heat exchanger, and the inlet and outlet gas port of the front-row heat exchanger is connected with the gas pipe. The front-row heat exchanger is located at the windward side of the rear-row heat exchanger. One end of the shunt pipeline is connected with the liquid pipe, and the other end of the shunt pipeline is connected with the second inlet and outlet liquid port of the rear-row heat exchanger. The shunt pipeline is provided with a second valve. The opening degree of the first valve and the second valve is adjusted to adjust the refrigerant amount entering the rear-row heat exchanger and the shunt pipeline, so that the refrigerant temperature entering the front-row heat exchanger can be adjusted, and then the evaporation temperature of the front-row heat exchanger is adjusted to improve the heat exchange effect and solve the problem of poor heat exchange effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioning, and in particular relates to an indoor heat exchanger of an air conditioner, an air conditioner and a control method. Background Art

[0002] In low-temperature environments, such as communication base stations and bars, although the external temperature is low, the air conditioner is still needed for cooling.

[0003] Existing air conditioners operate in a low-temperature environment for cooling. Since the evaporation temperature and condensation temperature are both low and there is no adjustment device, the heat exchange effect becomes poor and the cooling effect is relatively poor, which cannot meet the cooling demand. Summary of the Invention

[0004] The present invention provides an indoor heat exchanger for an air conditioner, which solves the problem of poor heat exchange effect.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0006] An indoor heat exchanger for an air conditioner, comprising:

[0007] trachea;

[0008] liquid pipe;

[0009] A rear heat exchanger having a first liquid inlet and outlet and a second liquid inlet and outlet; the first liquid inlet and outlet of the rear heat exchanger is connected to the liquid pipe; and a first valve is provided at the first liquid inlet and outlet of the rear heat exchanger;

[0010] A front heat exchanger having a liquid inlet and outlet and an air inlet and outlet; the liquid inlet and outlet of the front heat exchanger are connected to the second liquid inlet and outlet of the rear heat exchanger, and the air inlet and outlet of the front heat exchanger are connected to the air pipe; and the front heat exchanger is located on the windward side of the rear heat exchanger;

[0011] A shunt pipeline has one end connected to the liquid pipe and the other end connected to the second liquid inlet and outlet of the rear heat exchanger; a second valve is provided on the shunt pipeline.

[0012] In some embodiments of the present application, an ejector is provided at the liquid inlet and outlet of the front-row heat exchanger.

[0013] In some embodiments of the present application, the ratio of the number of heat exchange tubes in the rear heat exchanger to the number of heat exchange tubes in the front heat exchanger is any value between 1 / 3 and 1 / 2.

[0014] An air conditioner, comprising:

[0015] compressor;

[0016] outdoor heat exchanger;

[0017] Indoor heat exchanger, which includes gas pipe, liquid pipe, rear heat exchanger, front heat exchanger, and diversion pipeline;

[0018] The rear heat exchanger has a first liquid inlet and outlet and a second liquid inlet and outlet; the first liquid inlet and outlet of the rear heat exchanger is connected to the liquid pipe; and a first valve is provided at the first liquid inlet and outlet of the rear heat exchanger;

[0019] The front heat exchanger has a liquid inlet and outlet and an air inlet and outlet; the liquid inlet and outlet of the front heat exchanger are connected to the second liquid inlet and outlet of the rear heat exchanger, and the air inlet and outlet of the front heat exchanger are connected to the air pipe; and the front heat exchanger is located on the windward side of the rear heat exchanger;

[0020] One end of the shunt pipeline is connected to the liquid pipe, and the other end of the shunt pipeline is connected to the second liquid inlet and outlet of the rear heat exchanger; a second valve is provided on the shunt pipeline;

[0021] A controller is used to control the opening of the first valve and the second valve.

[0022] In some embodiments of the present application, in the cooling mode, the controller is specifically configured to:

[0023] When the evaporation temperature of the front row heat exchanger is within the set temperature range, the first valve and the second valve are controlled to maintain their openings;

[0024] When the evaporation temperature of the front row heat exchanger is lower than the lower limit of the set temperature range, the second valve is controlled to be fully opened and the opening of the first valve is reduced;

[0025] When the evaporation temperature of the front row heat exchanger is greater than the upper limit of the set temperature range, the second valve is controlled to close and the opening of the first valve is increased.

[0026] In some embodiments of the present application, when the evaporation temperature of the front row heat exchanger is lower than the lower limit of the set temperature range, controlling the second valve to fully open and reducing the opening of the first valve specifically includes:

[0027] Calculate the difference between the lower limit of the set temperature range and the evaporation temperature of the front heat exchanger;

[0028] When the difference is greater than the first set difference, the second valve is controlled to be fully opened, and the opening of the first valve is reduced at a first set speed;

[0029] When 0<difference≤first set difference, the second valve is controlled to be fully open, and the opening of the first valve is reduced at a second set speed;

[0030] The first set speed is greater than the second set speed.

[0031] In some embodiments of the present application, when the evaporation temperature of the front row heat exchanger is greater than the upper limit of the set temperature range, controlling the second valve to close and increasing the opening of the first valve specifically includes:

[0032] Calculate the difference between the evaporation temperature of the front heat exchanger and the upper limit of the set temperature range;

[0033] When the difference is greater than the second set difference, the second valve is controlled to close, and the opening of the first valve increases at a third set speed;

[0034] When 0<difference≤second set difference, the second valve is controlled to close, and the opening of the first valve increases at a fourth set speed;

[0035] Among them, the third set speed>the fourth set speed.

[0036] In some embodiments of the present application, the evaporation temperature of the front-row heat exchanger refers to the temperature of the middle heat exchange tube of the front-row heat exchanger.

[0037] 14. The method of claim 13, wherein the indoor heat exchanger of the air conditioner comprises an air pipe, a liquid pipe, a rear heat exchanger, a front heat exchanger, and a diverter pipe; the rear heat exchanger has a first liquid inlet and a second liquid inlet and an outlet; the first liquid inlet and an outlet of the rear heat exchanger are connected to the liquid pipe; and a first valve is provided at the first liquid inlet and an outlet of the rear heat exchanger; the front heat exchanger has a liquid inlet and an outlet, and an air inlet and an outlet; the liquid inlet and an outlet of the front heat exchanger are connected to the second liquid inlet and an outlet of the rear heat exchanger, and the air inlet and an outlet of the front heat exchanger are connected to the air pipe; and the front heat exchanger is located on the windward side of the rear heat exchanger; one end of the diverter pipe is connected to the liquid pipe, and the other end of the diverter pipe is connected to the second liquid inlet and an outlet of the rear heat exchanger; a second valve is provided on the diverter pipe;

[0038] The control method includes:

[0039] Get the evaporation temperature of the front heat exchanger;

[0040] The openings of the first valve and the second valve are adjusted according to the obtained evaporation temperature of the front-row heat exchanger.

[0041] In some embodiments of the present application, adjusting the openings of the first valve and the second valve according to the obtained evaporation temperature of the front heat exchanger specifically includes:

[0042] In cooling mode,

[0043] When the evaporation temperature of the front row heat exchanger is within the set temperature range, the first valve and the second valve are controlled to maintain their openings;

[0044] When the evaporation temperature of the front row heat exchanger is lower than the lower limit of the set temperature range, the second valve is controlled to be fully opened and the opening of the first valve is reduced;

[0045] When the evaporation temperature of the front row heat exchanger is greater than the upper limit of the set temperature range, the second valve is controlled to close and the opening of the first valve is increased.

[0046] Compared with the prior art, the advantages and positive effects of the present invention are as follows: the indoor heat exchanger, air conditioner and control method of the air conditioner of the present invention are designed by designing the rear heat exchanger, the front heat exchanger and the diversion pipeline; the first liquid inlet and outlet of the rear heat exchanger are connected to the liquid pipe; a first valve is provided at the first liquid inlet and outlet of the rear heat exchanger; the liquid inlet and outlet of the front heat exchanger are connected to the second liquid inlet and outlet of the rear heat exchanger, and the air inlet and outlet of the front heat exchanger are connected to the air pipe; the front heat exchanger is located on the windward side of the rear heat exchanger; one end of the diversion pipeline is connected to the liquid pipe, and the other end of the diversion pipeline is connected to the second liquid inlet and outlet of the rear heat exchanger; a second valve is provided on the diversion pipeline; by adjusting the opening of the first valve and the second valve, the amount of refrigerant entering the rear heat exchanger and the diversion pipeline can be adjusted, so that the temperature of the refrigerant entering the front heat exchanger can be adjusted, and then the evaporation temperature of the front heat exchanger can be adjusted to improve the heat exchange effect, thereby solving the problem of poor heat exchange effect.

[0047] Other features and advantages of the present invention will become more apparent after reading the detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0049] Figure 1 1 is a structural diagram of an embodiment of an indoor heat exchanger for an air conditioner proposed by the present invention;

[0050] Figure 2 1 is a structural diagram of an embodiment of an air conditioner proposed by the present invention;

[0051] Figure 3 This is a flow chart of an embodiment of the air conditioner control method proposed by the present invention.

[0052] Reference numerals:

[0053] 10. Indoor heat exchanger; 11. Gas pipe; 12. Liquid pipe;

[0054] 13. Rear heat exchanger; 14. Front heat exchanger; 15. Diversion pipeline;

[0055] 16. Ejector; 17. First valve; 18. Second valve;

[0056] 20. Throttle valve;

[0057] 30. Outdoor heat exchanger. DETAILED DESCRIPTION

[0058] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0059] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application 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 this application.

[0060] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0061] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0062] To address the current technical problem of poor heat exchange performance in air conditioners, the present invention proposes an indoor heat exchanger, an air conditioner, and a control method for an air conditioner. These improve the heat exchange performance of the indoor heat exchanger, enhance the cooling performance of the air conditioner, and meet cooling requirements. The indoor heat exchanger, air conditioner, and control method of the present invention are described in detail below with reference to the accompanying drawings.

[0063] Example 1

[0064] The indoor heat exchanger 10 of the air conditioner of this embodiment includes an air pipe 11, a liquid pipe 12, a rear heat exchanger 13, a front heat exchanger 14, a diversion pipe 15, etc. Figure 1 shown.

[0065] The rear heat exchanger 13 has a first liquid inlet and a second liquid inlet; the first liquid inlet of the rear heat exchanger 13 is connected to the liquid pipe 12; a first valve 17 is provided at the first liquid inlet of the rear heat exchanger 13.

[0066] The front heat exchanger 14 has a liquid inlet and outlet, and an air inlet and outlet. The liquid inlet and outlet of the front heat exchanger 14 are connected to the second liquid inlet and outlet of the rear heat exchanger 13, and the air inlet and outlet of the front heat exchanger 14 are connected to the air pipe 11. The front heat exchanger 14 is located on the windward side of the rear heat exchanger 13. The airflow first passes through the front heat exchanger 14 and then passes through the rear heat exchanger 13. In other words, the airflow first exchanges heat with the front heat exchanger 14 and then with the rear heat exchanger 13.

[0067] One end of the shunt pipe 15 is connected to the liquid pipe 12 , and the other end of the shunt pipe 15 is connected to the second liquid inlet and outlet of the rear heat exchanger 13 ; a second valve 18 is provided on the shunt pipe 15 .

[0068] In the indoor heat exchanger 10 of this embodiment, the rear heat exchanger 13 and the front heat exchanger 14 are connected in series, and the diversion pipeline 15 is connected in parallel with the rear heat exchanger 13 .

[0069] When the refrigerant enters the indoor heat exchanger 10 from the liquid pipe 12, the refrigerant flowing out of the liquid pipe 12 is divided into two paths, one path of refrigerant enters the rear heat exchanger 13, and the other path of refrigerant enters the diversion pipe 15. Then the two paths of refrigerant converge to the front heat exchanger 14, and then flow into the gas pipe 11 from the front heat exchanger 14.

[0070] By adjusting the opening of the first valve 17 and the second valve 18, the amount of refrigerant entering the rear heat exchanger 13 and the amount of refrigerant in the bypass pipe 15 can be adjusted, so that the temperature of the refrigerant converging to the front heat exchanger 14 can be adjusted, that is, the temperature of the refrigerant entering the front heat exchanger 14 can be adjusted, and then the evaporation temperature of the front heat exchanger 14 can be adjusted to improve the heat exchange effect.

[0071] When the air conditioner is in cooling operation, the refrigerant enters the indoor heat exchanger 10 from the liquid pipe 12.

[0072] If you want to increase the temperature of the refrigerant entering the front heat exchanger 14, control the second valve 18 to be fully open and reduce the opening of the first valve 17; that is, the amount of refrigerant entering the bypass pipe 15 increases, and the amount of refrigerant entering the rear heat exchanger 13 decreases. Therefore, the amount of refrigerant participating in the heat exchange in the rear heat exchanger 13 is reduced, which increases the temperature of the refrigerant entering the front heat exchanger 14, thereby increasing the evaporation temperature of the front heat exchanger 14.

[0073] If you want to lower the temperature of the refrigerant entering the front heat exchanger 14, control the second valve 18 to close and increase the opening of the first valve 17; that is, the amount of refrigerant entering the bypass pipe 15 is reduced, and the amount of refrigerant entering the rear heat exchanger 13 is increased. Therefore, the amount of refrigerant participating in the heat exchange in the rear heat exchanger 13 is increased, which reduces the temperature of the refrigerant entering the front heat exchanger 14, thereby reducing the evaporation temperature of the front heat exchanger 14.

[0074] The indoor heat exchanger 10 of this embodiment is designed with a rear heat exchanger 13, a front heat exchanger 14, and a diversion pipe 15; the first liquid inlet and outlet of the rear heat exchanger 13 are connected to the liquid pipe 12; a first valve 17 is provided at the first liquid inlet and outlet of the rear heat exchanger 13; the liquid inlet and outlet of the front heat exchanger 14 are connected to the second liquid inlet and outlet of the rear heat exchanger 13, and the air inlet and outlet of the front heat exchanger 14 are connected to the air pipe 11; the front heat exchanger 14 is located on the windward side of the rear heat exchanger 13. side; one end of the shunt pipe 15 is connected to the liquid pipe 12, and the other end of the shunt pipe 15 is connected to the second liquid inlet and outlet of the rear heat exchanger 13; a second valve 18 is provided on the shunt pipe 15; by adjusting the opening of the first valve 17 and the second valve 18 to adjust the amount of refrigerant entering the rear heat exchanger 13 and the shunt pipe 15, the temperature of the refrigerant entering the front heat exchanger 14 can be adjusted, and then the evaporation temperature of the front heat exchanger 14 can be adjusted to improve the heat exchange effect.

[0075] The indoor heat exchanger 10 of this embodiment can increase the evaporation temperature of the front heat exchanger 14 in a low temperature environment, thereby improving the heat exchange effect and increasing the cooling capacity of the air conditioner to meet the cooling demand.

[0076] In some embodiments of the present application, an ejector 16 is provided at the liquid inlet and outlet of the front heat exchanger 14 to introduce the refrigerant flowing out of the rear heat exchanger 13 and the refrigerant flowing out of the diversion pipe 15 into the front heat exchanger 14 to prevent poor refrigerant circulation due to too low pressure.

[0077] When the refrigerant flow rate, pressure and flow rate in the rear heat exchanger 13 are small, the pressure is low and the flow rate is low, while the refrigerant flow rate, pressure and flow rate in the bypass pipe 15 are large, the ejector 16 draws out the refrigerant flowing out of the rear heat exchanger 13, mixes it with the refrigerant flowing out of the bypass pipe 15, and introduces it into the front heat exchanger 14.

[0078] In some embodiments of the present application, the rear heat exchanger 13 includes a heat exchange pipeline composed of multiple heat exchange tubes connected in series. The front heat exchanger 14 includes a heat exchange pipeline composed of multiple heat exchange tubes connected in series. Alternatively, the front heat exchanger 14 includes multiple heat exchange pipelines connected in parallel, each heat exchange pipeline composed of multiple heat exchange tubes connected in series.

[0079] The ratio of the number of heat exchange tubes of the rear heat exchanger 13 to the number of heat exchange tubes of the front heat exchanger 14 is any value between 1 / 3 and 1 / 2.

[0080] The airflow first undergoes a first heat exchange with the front heat exchanger 14 and then undergoes a second heat exchange with the rear heat exchanger 13 .

[0081] If the ratio of the number of heat exchange tubes in the rear heat exchanger 13 to the number of heat exchange tubes in the front heat exchanger 14 is too small, the heat exchange effect of the second heat exchange will be affected, and the evaporation temperature of the front heat exchanger 14 cannot be changed effectively and quickly.

[0082] If the ratio of the number of heat exchange tubes in the rear heat exchanger 13 to the number of heat exchange tubes in the front heat exchanger 14 is too large, the evaporation temperature of the front heat exchanger 14 will be greatly affected, which may easily cause unstable operation of the air conditioner.

[0083] Therefore, in this embodiment, the ratio of the number of heat exchange tubes in the rear heat exchanger 13 to the number of heat exchange tubes in the front heat exchanger 14 is any value between 1 / 3 and 1 / 2, which can effectively and quickly change the evaporation temperature of the front heat exchanger 14 while ensuring the heat exchange effect of the second heat exchange.

[0084] Example 2

[0085] Based on the design of the indoor heat exchanger 10 in the first embodiment, the second embodiment proposes an air conditioner, which includes the indoor heat exchanger 10 in the first embodiment.

[0086] The air conditioner of this embodiment includes a compressor, an outdoor heat exchanger 30, a throttle valve 20, an indoor heat exchanger 10, a controller, etc. Figure 2 The compressor, the outdoor heat exchanger 30, the throttle valve 20, and the indoor heat exchanger 10 are sequentially connected to form a refrigerant circulation system.

[0087] The indoor heat exchanger 10 includes an air pipe 11, a liquid pipe 12, a rear heat exchanger 13, a front heat exchanger 14, a diversion pipe 15, etc. Figure 1 shown.

[0088] The rear heat exchanger 13 has a first liquid inlet and a second liquid inlet; the first liquid inlet of the rear heat exchanger 13 is connected to the liquid pipe 12; a first valve 17 is provided at the first liquid inlet of the rear heat exchanger 13.

[0089] The front heat exchanger 14 has a liquid inlet and outlet, and an air inlet and outlet. The liquid inlet and outlet of the front heat exchanger 14 are connected to the second liquid inlet and outlet of the rear heat exchanger 13, and the air inlet and outlet of the front heat exchanger 14 are connected to the air pipe 11. The front heat exchanger 14 is located on the windward side of the rear heat exchanger 13. The airflow first passes through the front heat exchanger 14 and then passes through the rear heat exchanger 13. In other words, the airflow first exchanges heat with the front heat exchanger 14 and then with the rear heat exchanger 13.

[0090] One end of the shunt pipe 15 is connected to the liquid pipe 12 , and the other end of the shunt pipe 15 is connected to the second liquid inlet and outlet of the rear heat exchanger 13 ; a second valve 18 is provided on the shunt pipe 15 .

[0091] The compressor's exhaust port is connected to the gas pipe of the outdoor heat exchanger 30. The liquid pipe of the outdoor heat exchanger 30 is connected to the liquid pipe 12 of the indoor heat exchanger 10. The gas pipe 11 of the indoor heat exchanger 10 is connected to the compressor's intake port. The throttle valve 20 is installed on the liquid pipe of the outdoor heat exchanger 30; of course, it can also be installed on the liquid pipe 12 of the indoor heat exchanger 10.

[0092] The controller is used to control the opening of the first valve 17 , the second valve 18 , and the throttle valve 30 .

[0093] In the cooling mode, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor enters the outdoor heat exchanger 30. The refrigerant flowing out of the outdoor heat exchanger 30 is throttled by the throttle valve 20 and becomes a low-temperature and low-pressure liquid refrigerant. Then, it enters the indoor heat exchanger 10. The refrigerant flowing out of the indoor heat exchanger 10 flows back to the compressor.

[0094] In cooling mode, the refrigerant enters the indoor 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 refrigerant enters the rear heat exchanger 13, and the other path of refrigerant enters the diversion pipe 15, and then the two paths of refrigerant converge to the front heat exchanger 14, and then flow into the air pipe 11 from the front heat exchanger 14.

[0095] By adjusting the opening of the first valve 17 and the second valve 18, the amount of refrigerant entering the rear heat exchanger 13 and the amount of refrigerant in the bypass pipe 15 can be adjusted, so that the temperature of the refrigerant converging to the front heat exchanger 14 can be adjusted, that is, the temperature of the refrigerant entering the front heat exchanger 14 can be adjusted, and then the evaporation temperature of the front heat exchanger 14 can be adjusted to improve the heat exchange effect and increase the cooling capacity.

[0096] In cooling mode, the controller adjusts the opening of the throttle valve 20 according to the degree of supercooling, so that the refrigerant flowing to the indoor heat exchanger 10 becomes a low-temperature and low-pressure liquid refrigerant, ensuring normal cooling operation of the air conditioner.

[0097] The air conditioner of this embodiment is designed with a rear heat exchanger 13, a front heat exchanger 14, and a diversion pipe 15 in the indoor heat exchanger 10; the first liquid inlet and outlet of the rear heat exchanger 13 are connected to the liquid pipe 12; a first valve 17 is provided at the first liquid inlet and outlet of the rear heat exchanger 13; the liquid inlet and outlet of the front heat exchanger 14 are connected to the second liquid inlet and outlet of the rear heat exchanger 13, and the air inlet and outlet of the front heat exchanger 14 are connected to the air pipe 11; the front heat exchanger 14 is located on the windward side of the rear heat exchanger 13 side; one end of the shunt pipe 15 is connected to the liquid pipe 12, and the other end of the shunt pipe 15 is connected to the second liquid inlet and outlet of the rear heat exchanger 13; a second valve 18 is provided on the shunt pipe 15; by adjusting the opening of the first valve 17 and the second valve 18 to adjust the amount of refrigerant entering the rear heat exchanger 13 and the shunt pipe 15, the temperature of the refrigerant entering the front heat exchanger 14 can be adjusted, and then the evaporation temperature of the front heat exchanger 14 can be adjusted to improve the heat exchange effect and increase the cooling capacity.

[0098] The air conditioner of this embodiment can increase the evaporation temperature of the front heat exchanger 14 in a low-temperature environment, thereby improving the heat exchange effect and the cooling capacity to meet the cooling demand.

[0099] In some embodiments of the present application, in the cooling mode, the controller is specifically configured to perform the following operations:

[0100] (1) When the evaporation temperature of the front heat exchanger is within the set temperature range, it means that the evaporation temperature of the front heat exchanger is relatively appropriate, and the first valve 17 and the second valve 18 are controlled to maintain the opening.

[0101] (2) When the evaporation temperature of the front heat exchanger is lower than the lower limit of the set temperature range, it means that the evaporation temperature of the front heat exchanger is low. Then the second valve 18 is controlled to be fully open and the opening of the first valve 17 is reduced, so that the amount of refrigerant entering the rear heat exchanger is reduced, that is, the amount of refrigerant participating in the heat exchange in the rear heat exchanger is reduced, thereby increasing the temperature of the refrigerant entering the front heat exchanger, and then increasing the evaporation temperature of the front heat exchanger.

[0102] (3) When the evaporation temperature of the front heat exchanger is greater than the upper limit of the set temperature range, it means that the evaporation temperature of the front heat exchanger is higher, so the second valve 18 is controlled to be closed and the opening of the first valve 17 is increased, so that the amount of refrigerant entering the rear heat exchanger increases, that is, the amount of refrigerant participating in the heat exchange of the rear heat exchanger increases, thereby reducing the temperature of the refrigerant entering the front heat exchanger, and further reducing the evaporation temperature of the front heat exchanger.

[0103] By controlling the openings of the first valve 17 and the second valve 18 according to (1) to (3) above in the cooling mode, the evaporation temperature of the front heat exchanger can be adjusted, thereby improving the heat exchange effect of the front heat exchanger and ensuring the normal cooling operation of the air conditioner. Moreover, the control is simple and easy to implement.

[0104] Assuming that the target evaporation temperature of the front heat exchanger is T0 and the accuracy hysteresis is △T, the set temperature range is [T0-△T, T0+△T]; the lower limit of the set temperature range is T0-△T; the upper limit of the set temperature range is T0+△T.

[0105] In some embodiments of the present application, when the evaporation temperature of the front row heat exchanger is lower than the lower limit of the set temperature range, the second valve 18 is controlled to be fully opened and the opening of the first valve 17 is reduced, specifically including the following steps:

[0106] (21) Calculate the difference between the lower limit of the set temperature range and the evaporation temperature of the front heat exchanger.

[0107] (22) When the difference is greater than the first set difference, it indicates that the evaporation temperature of the front heat exchanger is very low, and the second valve 18 is controlled to be fully opened, and the first valve opening 17 is reduced at the first set speed V1; so as to quickly reduce the amount of refrigerant entering the rear heat exchanger, thereby quickly increasing the temperature of the refrigerant entering the front heat exchanger, and then quickly increasing the evaporation temperature of the front heat exchanger to avoid affecting normal heat exchange.

[0108] (23) When 0<difference ≤ first set difference, it indicates that the evaporation temperature of the front heat exchanger is low, and the second valve 18 is controlled to be fully open, and the first valve opening 17 is reduced at the second set speed V2; so as to slowly reduce the amount of refrigerant entering the rear heat exchanger, thereby slowly increasing the temperature of the refrigerant entering the front heat exchanger, and then slowly increasing the evaporation temperature of the front heat exchanger, so as to avoid affecting the stable operation of the air conditioner.

[0109] The first set speed V1 is greater than the second set speed V2.

[0110] By designing (21) to (23), when the difference between the lower limit of the set temperature range and the evaporation temperature of the front heat exchanger is large, the evaporation temperature of the front heat exchanger is quickly increased; when the difference is small, the evaporation temperature of the front heat exchanger is slowly increased; this ensures both the heat exchange effect of the indoor heat exchanger and the stable operation of the air conditioner.

[0111] In some embodiments of the present application, when the evaporation temperature of the front row heat exchanger is greater than the upper limit of the set temperature range, the second valve 18 is controlled to close and the opening of the first valve 17 is increased, specifically including the following steps:

[0112] (31) Calculate the difference between the evaporation temperature of the front heat exchanger and the upper limit of the set temperature range.

[0113] (32) When the difference is greater than the second set difference, it indicates that the evaporation temperature of the front heat exchanger is very high, and the second valve 18 is controlled to close, and the opening of the first valve 17 is increased at the third set speed V3; so as to quickly increase the amount of refrigerant entering the rear heat exchanger, thereby quickly reducing the temperature of the refrigerant entering the front heat exchanger, and then quickly reducing the evaporation temperature of the front heat exchanger, thereby ensuring the normal operation of the air conditioner.

[0114] (33) When 0<difference ≤ second set difference, it means that the evaporation temperature of the front heat exchanger is high, then the second valve 18 is controlled to close, and the opening of the first valve 17 is increased at the fourth set speed V4; so as to slowly increase the amount of refrigerant entering the rear heat exchanger, thereby slowly reducing the temperature of the refrigerant entering the front heat exchanger, and then slowly reducing the evaporation temperature of the front heat exchanger, so as to avoid affecting the stable operation of the air conditioner.

[0115] The third set speed V3 is greater than the fourth set speed V4.

[0116] By designing (31) to (33), when the difference between the evaporation temperature of the front heat exchanger and the upper limit of the set temperature range is large, the evaporation temperature of the front heat exchanger is quickly reduced; when the difference is small, the evaporation temperature of the front heat exchanger is slowly reduced, thereby ensuring both the heat exchange effect of the indoor heat exchanger and the stable operation of the air conditioner.

[0117] In some embodiments of the present application, in cooling mode, the evaporation temperature of the front heat exchanger refers to the temperature of the middle heat exchange tube of the front heat exchanger. By measuring the temperature of the middle heat exchange tube, the evaporation temperature of the front heat exchanger can be easily, conveniently and quickly determined. The middle heat exchange tube refers to the middle heat exchange tube among the multiple heat exchange tubes arranged from top to bottom in the front heat exchanger.

[0118] The air conditioner of this embodiment adjusts the refrigerant flow rate of the rear heat exchanger 13 to increase the evaporation temperature of the front heat exchanger 14. The ejector 16 is designed to smoothly mix the refrigerant flowing out of the rear heat exchanger 13 and the refrigerant flowing out of the diverter pipe 15 and flow to the front heat exchanger 14, thereby increasing the temperature of the refrigerant entering the front heat exchanger 14 and thereby increasing the evaporation temperature of the front heat exchanger 14 and the cooling capacity. When the refrigerant flow rate into the rear heat exchanger 13 decreases, the cooling capacity of the rear heat exchanger 13 decreases. However, due to the increase in the evaporation temperature of the front heat exchanger 14, the cooling capacity of the front heat exchanger 14 increases, and the cooling capacity of the entire indoor heat exchanger 10 increases, thereby improving the cooling effect and enhancing the cooling capacity of the air conditioner at low temperatures.

[0119] When the evaporation temperature of the front heat exchanger 14 increases, the temperature of the refrigerant flowing back to the compressor will also increase, thereby increasing the condensing temperature of the outdoor heat exchanger 30 and improving the heat exchange effect of the entire air conditioner.

[0120] When the openings of the first valve 17 , the second valve 18 , and the throttle valve 20 are adjusted, the openings of the three valves are adjusted by adjusting the pulses.

[0121] Example 3:

[0122] Based on the design of the air conditioner in the second embodiment, this third embodiment proposes a method for controlling the air conditioner.

[0123] The air conditioner includes a compressor, an outdoor heat exchanger 30, a throttle valve 20, an indoor heat exchanger 10, a controller, etc. Figure 2 The compressor, the outdoor heat exchanger 30, the throttle valve 20, and the indoor heat exchanger 10 are sequentially connected to form a refrigerant circulation system.

[0124] The indoor heat exchanger 10 includes an air pipe 11, a liquid pipe 12, a rear heat exchanger 13, a front heat exchanger 14, a diversion pipe 15, etc. Figure 1 shown.

[0125] The rear heat exchanger 13 has a first liquid inlet and a second liquid inlet; the first liquid inlet of the rear heat exchanger 13 is connected to the liquid pipe 12; a first valve 17 is provided at the first liquid inlet of the rear heat exchanger 13.

[0126] The front heat exchanger 14 has a liquid inlet and outlet, and an air inlet and outlet. The liquid inlet and outlet of the front heat exchanger 14 are connected to the second liquid inlet and outlet of the rear heat exchanger 13, and the air inlet and outlet of the front heat exchanger 14 are connected to the air pipe 11. The front heat exchanger 14 is located on the windward side of the rear heat exchanger 13. The airflow first passes through the front heat exchanger 14 and then passes through the rear heat exchanger 13. In other words, the airflow first exchanges heat with the front heat exchanger 14 and then with the rear heat exchanger 13.

[0127] One end of the shunt pipe 15 is connected to the liquid pipe 12 , and the other end of the shunt pipe 15 is connected to the second liquid inlet and outlet of the rear heat exchanger 13 ; a second valve 18 is provided on the shunt pipe 15 .

[0128] The compressor's exhaust port is connected to the gas pipe of the outdoor heat exchanger 30, the liquid pipe of the outdoor heat exchanger 30 is connected to the liquid pipe 12 of the indoor heat exchanger 10, and the gas pipe 11 of the indoor heat exchanger 10 is connected to the compressor's intake port. A throttle valve 20 is provided on the liquid pipe of the outdoor heat exchanger 30.

[0129] The controller is used to control the opening of the first valve 17 , the second valve 18 , and the throttle valve 30 .

[0130] The specific structural design of the air conditioner is described in the second embodiment and will not be repeated here.

[0131] The air conditioner control method of this embodiment mainly includes the following steps: Figure 3shown.

[0132] Step S1: Obtain the evaporation temperature of the front heat exchanger.

[0133] The temperature of the middle heat exchange tube of the front heat exchanger is obtained by the temperature sensor, which is the evaporation temperature of the front heat exchanger.

[0134] Step S2: adjusting the openings of the first valve 17 and the second valve 18 according to the obtained evaporation temperature of the front heat exchanger.

[0135] By adjusting the opening of the first valve 17 and the second valve 18, the amount of refrigerant entering the rear heat exchanger 13 and the amount of refrigerant in the bypass pipe 15 can be adjusted, so that the temperature of the refrigerant converging to the front heat exchanger 14 can be adjusted, that is, the temperature of the refrigerant entering the front heat exchanger 14 can be adjusted, and then the evaporation temperature of the front heat exchanger 14 can be adjusted to improve the heat exchange effect and increase the cooling capacity.

[0136] The air conditioner control method of this embodiment is to design a rear heat exchanger 13, a front heat exchanger 14, and a diversion pipe 15 in the indoor heat exchanger 10 of the air conditioner; the first liquid inlet and outlet of the rear heat exchanger 13 are connected to the liquid pipe 12; a first valve 17 is provided at the first liquid inlet and outlet of the rear heat exchanger 13; the liquid inlet and outlet of the front heat exchanger 14 are connected to the second liquid inlet and outlet of the rear heat exchanger 13, and the air inlet and outlet of the front heat exchanger 14 are connected to the air pipe 11; the front heat exchanger 14 is located on the windward side of the rear heat exchanger 13; the diversion pipe 15 is ... One end of the pipeline 15 is connected to the liquid pipe 12, and the other end of the bypass pipeline 15 is connected to the second liquid inlet and outlet of the rear heat exchanger 13; a second valve 18 is provided on the bypass pipeline 15; the opening of the first valve 17 and the second valve 18 is adjusted according to the obtained evaporation temperature of the front heat exchanger to adjust the amount of refrigerant entering the rear heat exchanger 13 and the bypass pipeline 15, so as to adjust the temperature of the refrigerant entering the front heat exchanger 14, and then adjust the evaporation temperature of the front heat exchanger 14 to improve the heat exchange effect and thus increase the cooling capacity.

[0137] By adjusting the opening of the first valve 17 and the second valve 18, the evaporation temperature is kept within the set temperature range, ensuring normal cooling operation of the air conditioner.

[0138] In step S2, the openings of the first valve 17 and the second valve 18 are adjusted according to the obtained evaporation temperature of the front heat exchanger, which specifically includes the following steps:

[0139] In cooling mode,

[0140] (1) When the evaporation temperature of the front heat exchanger is within the set temperature range, it means that the evaporation temperature of the front heat exchanger is relatively appropriate, and the first valve 17 and the second valve 18 are controlled to maintain the opening.

[0141] (2) When the evaporation temperature of the front heat exchanger is lower than the lower limit of the set temperature range, it means that the evaporation temperature of the front heat exchanger is low, so the second valve 18 is controlled to be fully open and the opening of the first valve 17 is reduced; so that the amount of refrigerant entering the rear heat exchanger is reduced, that is, the amount of refrigerant participating in the heat exchange of the rear heat exchanger is reduced, thereby increasing the temperature of the refrigerant entering the front heat exchanger, and then increasing the evaporation temperature of the front heat exchanger.

[0142] (3) When the evaporation temperature of the front heat exchanger is greater than the upper limit of the set temperature range, it means that the evaporation temperature of the front heat exchanger is higher, so the second valve 18 is controlled to close and the opening of the first valve 17 is increased; so that the amount of refrigerant entering the rear heat exchanger increases, that is, the amount of refrigerant participating in the heat exchange of the rear heat exchanger increases, thereby reducing the temperature of the refrigerant entering the front heat exchanger, and further reducing the evaporation temperature of the front heat exchanger.

[0143] By controlling the openings of the first valve 17 and the second valve 18 according to (1) to (3) above in the cooling mode, the evaporation temperature of the front heat exchanger can be adjusted, thereby improving the heat exchange effect of the front heat exchanger and ensuring the normal cooling operation of the air conditioner. Moreover, the control is simple and easy to implement.

[0144] When the evaporation temperature of the front row heat exchanger is lower than the lower limit of the set temperature range, the specific steps of controlling the second valve to fully open and reducing the opening of the first valve are described in the second embodiment.

[0145] When the evaporation temperature of the front row heat exchanger is greater than the upper limit of the set temperature range, the specific steps of controlling the second valve to close and the first valve to increase the opening degree are described in the second embodiment.

[0146] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air conditioner, characterized in that: include: compressor; outdoor heat exchanger; Indoor heat exchanger, which includes gas pipe, liquid pipe, rear heat exchanger, front heat exchanger, and diversion pipeline; The rear heat exchanger has a first liquid inlet and outlet and a second liquid inlet and outlet; the first liquid inlet and outlet of the rear heat exchanger is connected to the liquid pipe; and a first valve is provided at the first liquid inlet and outlet of the rear heat exchanger; The front heat exchanger has a liquid inlet and outlet and an air inlet and outlet; the liquid inlet and outlet of the front heat exchanger are connected to the second liquid inlet and outlet of the rear heat exchanger, and the air inlet and outlet of the front heat exchanger are connected to the air pipe; and the front heat exchanger is located on the windward side of the rear heat exchanger; One end of the shunt pipeline is connected to the liquid pipe, and the other end of the shunt pipeline is connected to the second liquid inlet and outlet of the rear heat exchanger; a second valve is provided on the shunt pipeline; a controller for controlling the opening of the first valve and the second valve; In cooling mode, the controller is specifically configured to: When the evaporation temperature of the front row heat exchanger is within the set temperature range, the first valve and the second valve are controlled to maintain their openings; When the evaporation temperature of the front row heat exchanger is lower than the lower limit of the set temperature range, the second valve is controlled to be fully opened and the opening of the first valve is reduced; When the evaporation temperature of the front row heat exchanger is greater than the upper limit of the set temperature range, the second valve is controlled to close and the opening of the first valve is increased.

2. The air conditioner according to claim 1, characterized in that: When the evaporation temperature of the front row heat exchanger is lower than the lower limit of the set temperature range, the second valve is controlled to be fully opened and the opening of the first valve is reduced, specifically including: Calculate the difference between the lower limit of the set temperature range and the evaporation temperature of the front heat exchanger; When the difference is greater than the first set difference, the second valve is controlled to be fully opened, and the opening of the first valve is reduced at a first set speed; When 0<difference≤first set difference, the second valve is controlled to be fully open, and the opening of the first valve is reduced at a second set speed; The first set speed is greater than the second set speed.

3. The air conditioner according to claim 1, wherein: When the evaporation temperature of the front row heat exchanger is greater than the upper limit of the set temperature range, controlling the second valve to close and the first valve to increase the opening degree specifically includes: Calculate the difference between the evaporation temperature of the front heat exchanger and the upper limit of the set temperature range; When the difference is greater than the second set difference, the second valve is controlled to close, and the opening of the first valve increases at a third set speed; When 0<difference≤second set difference, the second valve is controlled to close, and the opening of the first valve increases at a fourth set speed; Among them, the third set speed>the fourth set speed.

4. The air conditioner according to any one of claims 1 to 3, characterized in that: The evaporation temperature of the front heat exchanger refers to the temperature of the middle heat exchange tube of the front heat exchanger.

5. The air conditioner according to claim 1, characterized in that: Ejectors are provided at the liquid inlet and outlet of the front-row heat exchanger.

6. The air conditioner according to claim 1 or 5, characterized in that: The ratio of the number of heat exchange tubes in the rear heat exchanger to the number of heat exchange tubes in the front heat exchanger is any value between 1 / 3 and 1 / 2.

7. An air conditioner control method, characterized in that: The indoor heat exchanger of the air conditioner includes an air pipe, a liquid pipe, a rear heat exchanger, a front heat exchanger, and a diverter pipe; the rear heat exchanger has a first liquid inlet and outlet and a second liquid inlet and outlet; the first liquid inlet and outlet of the rear heat exchanger is connected to the liquid pipe; and a first valve is provided at the first liquid inlet and outlet of the rear heat exchanger; the front heat exchanger has a liquid inlet and outlet, and an air inlet and outlet; the liquid inlet and outlet of the front heat exchanger are connected to the second liquid inlet and outlet of the rear heat exchanger, and the air inlet and outlet of the front heat exchanger are connected to the air pipe; and the front heat exchanger is located on the windward side of the rear heat exchanger; one end of the diverter pipe is connected to the liquid pipe, and the other end of the diverter pipe is connected to the second liquid inlet and outlet of the rear heat exchanger; a second valve is provided on the diverter pipe; The control method includes: Get the evaporation temperature of the front heat exchanger; adjusting the openings of the first valve and the second valve according to the obtained evaporation temperature of the front heat exchanger; The adjusting the openings of the first valve and the second valve according to the obtained evaporation temperature of the front heat exchanger specifically includes: In cooling mode, When the evaporation temperature of the front row heat exchanger is within the set temperature range, the first valve and the second valve are controlled to maintain their openings; When the evaporation temperature of the front row heat exchanger is lower than the lower limit of the set temperature range, the second valve is controlled to be fully opened and the opening of the first valve is reduced; When the evaporation temperature of the front row heat exchanger is greater than the upper limit of the set temperature range, the second valve is controlled to close and the opening of the first valve is increased.

Images