Split control method for air conditioner

Abstract

The present application relates to the air conditioning technical field, specifically to a kind of air conditioner's shunt control method.This application aims to solve the problems of existing shunt mode, such as complex shunt system, large structure space, not conducive to assembly and application.To this end, the air conditioner of the present application is provided with a variable displacement compressor, the indoor heat exchanger includes inner discharge heat pipe line, outer discharge heat pipe line and the communication pipe line connecting the two, the outdoor heat exchanger includes a plurality of heat pipe sections and the on-off valve group that can switch the communication form between heat pipe sections, and the control method includes: obtaining the operating mode of the air conditioner;Based on the operating mode, determine the communication form of the outdoor heat exchanger and the indoor heat exchanger, and the working mode of the variable displacement compressor;Based on the communication form and the working mode, control the air conditioner to work.This application can realize the adaptive coupling change of shunt, improve the heat exchange effect of air conditioner, and the variable displacement compressor can further improve the operating efficiency of air conditioner.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to a split control method of an air conditioner. BACKGROUND

[0002] The development of household air conditioners has entered an era of high energy efficiency, miniaturization and low resource consumption, requiring improved heat exchanger efficiency and resource conservation. During refrigeration and heating, the functions of indoor heat exchangers and outdoor heat exchangers are different. Whether indoor heat exchangers or outdoor heat exchangers, when used as condensers and evaporators, different forms of split are required. As an evaporator, the pressure is low and the flow rate is slow, requiring multiple flow paths. As a condenser, the temperature is high and the pressure is large, requiring a large heat exchange temperature difference and a large subcooling degree.

[0003] If the existing heat exchanger needs to be split, a split pipe or a splitter is usually used for split design. However, the conventional split method has many drawbacks, such as a complex split system, a large structure space, and being not conducive to assembly and application. Moreover, the flow process of a split scheme is fixed and cannot be adaptively coupled to change according to the load and actual use.

[0004] Correspondingly, there is a need in the art for a new technical solution to solve the above problems. SUMMARY

[0005] To solve at least one of the above problems in the prior art, i.e., to solve the problems of a complex split system, a large structure space, and being not conducive to assembly and application of the existing split method, the present application provides a split control method of an air conditioner, the air conditioner comprising a variable displacement compressor, an outdoor heat exchanger, a throttling element, and an indoor heat exchanger, the variable displacement compressor having two compression cylinders,

[0006] The indoor heat exchanger comprises an inner discharge heat pipe and an outer discharge heat pipe that are independent of each other. The first end of the inner discharge heat pipe and the first end of the outer discharge heat pipe are in communication with the throttling element through a first liquid pipe and a second liquid pipe, respectively. The second end of the inner discharge heat pipe and the second end of the outer discharge heat pipe are in communication with the variable displacement compressor through a first gas pipe and a second gas pipe, respectively. A communication pipe is further provided between the first end of the inner discharge heat pipe and the second end of the outer discharge heat pipe. The communication pipe, the first liquid pipe, the second gas pipe, and the first gas pipe can be selectively communicated or blocked.

[0007] The outdoor heat exchanger comprises a plurality of heat pipe segments. A on-off valve group is further provided in the outdoor heat exchanger. The on-off valve group comprises a plurality of on-off valves. The on-off valve group is configured to control the communication form between the plurality of heat pipe segments.

[0008] The split control method comprises:

[0009] obtaining an operation mode of the air conditioner;

[0010] determining a connection form of the outdoor heat exchanger and the indoor heat exchanger and an operation mode of the variable displacement compressor based on the operation mode;

[0011] controlling the air conditioner to operate based on the connection form and the operation mode;

[0012] The operation mode of the variable displacement compressor comprises a double-cylinder mode and a double-stage mode, in the double-cylinder mode, two compression cylinders of the variable displacement compressor compress refrigerant separately, and in the double-stage mode, the two compression cylinders of the variable displacement compressor compress refrigerant in sequence.

[0013] In the preferred technical scheme of the split control method of the air conditioner, the outdoor heat exchanger comprises a first heat exchange pipe section, a second heat exchange pipe section and a third heat exchange pipe section connected in sequence, and the outdoor heat exchanger further comprises a first branch pipe, a second branch pipe and a third branch pipe, a first end of the first branch pipe is communicated with a refrigerant pipe between the variable displacement compressor and the first heat exchange pipe section, a second end of the first branch pipe is communicated with a refrigerant pipe between the second heat exchange pipe section and the third heat exchange pipe section, a first end of the second branch pipe is communicated with the third branch pipe, a second end of the second branch pipe is communicated with one end of the third heat exchange pipe section close to the second heat exchange pipe section, a first end of the third branch pipe is communicated with a refrigerant pipe between the first heat exchange pipe section and the second heat exchange pipe section, and a second end of the third branch pipe is communicated with a refrigerant pipe between the third heat exchange pipe section and the throttling element.

[0014] The on-off valve group comprises a first on-off valve, a second on-off valve, a third on-off valve and a fourth on-off valve, the first on-off valve is arranged in the first branch pipe, the second on-off valve is arranged in the refrigerant pipe between the second heat exchange pipe section and the third heat exchange pipe section and located between the second end of the first branch pipe and the third heat exchange pipe section, the third on-off valve is arranged in the second branch pipe, and the fourth on-off valve is arranged in the third branch pipe and located between the first end of the second branch pipe and the second end of the third branch pipe.

[0015] In the preferred technical scheme of the split control method of the air conditioner, the step of "determining a connection form of the outdoor heat exchanger and the indoor heat exchanger and an operation mode of the variable displacement compressor based on the operation mode" further comprises:

[0016] when the operation mode is a cooling mode, obtaining an outdoor environment temperature and a first condensing pressure of the outdoor heat exchanger;

[0017] determining a connection form of the outdoor heat exchanger and the indoor heat exchanger based on the outdoor ambient temperature;

[0018] determining the working mode of the variable displacement compressor based on the first condensing pressure.

[0019] In the preferred technical scheme of the split control method of the air conditioner, the step of "determining a connection form of the outdoor heat exchanger and the indoor heat exchanger based on the outdoor ambient temperature" further comprises:

[0020] when the outdoor ambient temperature is less than a first preset temperature threshold, the first on-off valve, the third on-off valve and the fourth on-off valve are closed, the second on-off valve is opened, the connection pipeline is blocked, the first liquid pipe is connected, the second gas pipe is connected, and the first gas pipe and the second gas pipe are blocked.

[0021] In the preferred technical scheme of the split control method of the air conditioner, the step of "determining a connection form of the outdoor heat exchanger and the indoor heat exchanger based on the outdoor ambient temperature" further comprises:

[0022] when the outdoor ambient temperature is greater than or equal to the first preset temperature threshold, the first on-off valve and the third on-off valve are opened, the second on-off valve and the fourth on-off valve are closed, the connection pipeline is blocked, the first liquid pipe is connected, the second gas pipe is connected, and the first gas pipe and the second gas pipe are blocked.

[0023] In the preferred technical scheme of the split control method of the air conditioner, the step of "determining the working mode of the variable displacement compressor based on the first condensing pressure" further comprises:

[0024] if the first condensing pressure is greater than a first preset pressure threshold, the working mode of the variable displacement compressor is determined as a two-stage mode;

[0025] if the first condensing pressure is less than or equal to the first preset pressure threshold, the working mode of the variable displacement compressor is determined as a two-cylinder mode.

[0026] In the preferred technical scheme of the split control method of the air conditioner, the step of "determining a connection form of the outdoor heat exchanger and the indoor heat exchanger based on the outdoor ambient temperature" further comprises:

[0027] when the working mode is a heating mode, the first on-off valve, the second on-off valve and the fourth on-off valve are opened, the third on-off valve is closed, the connection pipeline is connected, the first liquid pipe is blocked, the second gas pipe is blocked, and the first gas pipe and the second gas pipe are connected.

[0028] In the preferred technical solutions of the split control method of the air conditioner, the step of "determining the working mode of the variable displacement compressor based on the operation mode" further comprises:

[0029] When the operation mode is the heating mode, the second condensing pressure of the indoor heat exchanger is obtained;

[0030] The working mode of the variable displacement compressor is determined based on the second condensing pressure.

[0031] In the preferred technical solutions of the split control method of the air conditioner, the step of "determining the working mode of the variable displacement compressor based on the condensing pressure" further comprises:

[0032] If the second condensing pressure is greater than a second preset pressure threshold, the working mode of the variable displacement compressor is determined as the two-stage mode;

[0033] If the second condensing pressure is less than or equal to the second preset pressure threshold, the working mode of the variable displacement compressor is determined as the two-cylinder mode.

[0034] In the preferred technical solutions of the split control method of the air conditioner, a three-way control valve is arranged on the second gas pipe, the first port, the second port and the third port of the three-way control valve are respectively communicated with the second end of the outdoor exhaust heat exchange pipeline, the variable displacement compressor and the first gas pipe; and / or

[0035] A first one-way valve is arranged on the communication pipeline, and the first one-way valve is arranged to be conductive when the refrigerant flows from the first end of the indoor exhaust heat exchange pipeline to the second end of the outdoor exhaust heat exchange pipeline; and / or

[0036] A second one-way valve is arranged on the first liquid pipe, and the second one-way valve is arranged to be conductive when the refrigerant flows from the throttling element to the first end of the indoor exhaust heat exchange pipeline.

[0037] The technical solutions of the present application can switch the split forms of the indoor heat exchanger and the outdoor heat exchanger according to different application scenarios by determining the communication forms of the outdoor heat exchanger and the indoor heat exchanger and the working mode of the variable displacement compressor based on the operation mode of the air conditioner, realize adaptive coupling change of split, and improve the heat exchange efficiency and effect of the air conditioner. By arranging the variable displacement compressor, the variable displacement compressor can be used to switch multiple working modes during the split process, so that the air conditioner runs more efficiently and stably. Moreover, the above technical solutions are simple in structure, do not occupy additional space, and are beneficial to assembly and application. BRIEF DESCRIPTION OF DRAWINGS

[0038] The present application will be described below with reference to the accompanying drawings. In the drawings:

[0039] Figure 1System diagram of the air conditioner of the first embodiment of the present application in the heating mode;

[0040] Figure 2 System diagram of the air conditioner of the first embodiment of the present application in the heating mode;

[0041] Figure 3 Flow chart of the split control method of the air conditioner of the first embodiment of the present application;

[0042] Figure 4 System diagram of the air conditioner of the second embodiment of the present application in the double-stage mode of the compressor operation;

[0043] Figure 5 System diagram of the air conditioner of the second embodiment of the present application in the double-cylinder mode of the compressor operation;

[0044] Figure 6 Flow chart of the split control method of the air conditioner of the second embodiment of the present application.

[0045] List of reference signs

[0046] 1, compressor; 11, first compression cylinder; 12, second compression cylinder; 13, first port; 14, second port; 15, third port; 16, fourth port; 17, exhaust port; 2, second four-way valve; 3, outdoor heat exchanger; 31, first heat exchange pipe section; 32, second heat exchange pipe section; 33, third heat exchange pipe section; 34, first branch pipe; 35, second branch pipe; 36, third branch pipe; 4, throttling element; 5, indoor heat exchanger; 51, inner discharge heat exchange pipe; 511, first inner discharge heat exchange pipe section; 512, second inner discharge heat exchange pipe section; 52, outer discharge heat exchange pipe; 521, first outer discharge heat exchange pipe section; 522, second outer discharge heat exchange pipe section; 53, communication pipe; 61, first liquid pipe; 62, second liquid pipe; 63, first gas pipe; 64, second gas pipe; 71, first one-way valve; 72, second one-way valve; 73, three-way control valve; 81, first on-off valve; 82, second on-off valve; 83, third on-off valve; 84, fourth on-off valve; 9, first four-way valve; 10, gas-liquid separator. DETAILED DESCRIPTION

[0047] For example, although the detailed steps of the method of the present application are described in detail below, the skilled in the art can combine, split and change the order of the steps without deviating from the basic principles of the present application, and the modified technical solutions do not change the basic concept of the present application, and thus fall within the protection scope of the present application. For example, although the detailed steps of the method of the present application are described in detail below, the skilled in the art can combine, split and change the order of the steps without deviating from the basic principles of the present application, and the modified technical solutions do not change the basic concept of the present application, and thus fall within the protection scope of the present application.

[0048] It should be noted that, in the description of the present application, the terms indicating the direction or position relationship of the terms "upper", "lower" and the like are based on the direction or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", "fourth", "fifth" are only for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present application, "a plurality of" means at least two.

[0049] In addition, it should be noted that, in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication between the two elements inside. The skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0050] Firstly, referring to Figure 1 and Figure 2 , the air conditioner of the present application is described.

[0051] As shown in Figure 1 and Figure 2 , the air conditioner of the present application comprises a compressor 1, a second four-way valve 2, an outdoor heat exchanger 3, a throttling element 4 and an indoor heat exchanger 5. Among them, the compressor 1, the second four-way valve 2, the outdoor heat exchanger 3, the throttling element 4 and the indoor heat exchanger 5 are sequentially communicated through the refrigerant pipe to form a refrigerant circulation. Preferably, the throttling element 4 is an electronic expansion valve. The above connection mode and the working principle of the air conditioner are conventional technical means in the art, and the present application will not be described again.

[0052] Particularly, the outdoor heat exchanger 3 of the present application comprises a plurality of heat exchange pipe sections, and a group of on-off valves is further arranged in the outdoor heat exchanger 3, the group of on-off valves comprises a plurality of on-off valves, and the group of on-off valves is arranged to be capable of controlling the communication form between the plurality of heat exchange pipe sections. Specifically, the outdoor heat exchanger 3 comprises a first heat exchange pipe section 31, a second heat exchange pipe section 32 and a third heat exchange pipe section 33 connected in sequence. The first heat exchange pipe section 31 is located in the middle of the outdoor heat exchanger 3, the second heat exchange pipe section 32 is located above the first heat exchange pipe section 31, and the third heat exchange pipe section 33 is located below the first heat exchange pipe section 31. One end of the first heat exchange pipe section 31 is communicated with the exhaust port 17 of the compressor 1 through a refrigerant pipe, and the other end of the first heat exchange pipe section 31 is communicated with one end of the second heat exchange pipe section 32 through a refrigerant pipe, the other end of the second heat exchange pipe section 32 is communicated with one end of the third heat exchange pipe section 33 through a refrigerant pipe, and the other end of the third heat exchange pipe section 33 is communicated with the throttling element 4 through a refrigerant pipe.

[0053] The outdoor heat exchanger 3 further comprises a first branch pipe 34, a second branch pipe 35 and a third branch pipe 36. Among them, the first end of the first branch pipe 34 is communicated with the refrigerant pipe between the compressor 1 and the first heat exchange pipe section 31, and the second end of the first branch pipe 34 is communicated with the refrigerant pipe between the second heat exchange pipe section 32 and the third heat exchange pipe section 33. The first end of the second branch pipe 35 is communicated with the third branch pipe 36, the second end of the second branch pipe 35 is communicated with one end of the third heat exchange pipe section 33 close to the second heat exchange pipe section 32 (i.e. the end of the third heat exchange pipe section 33 communicated with the second heat exchange pipe section 32), the first end of the third branch pipe 36 is communicated with the refrigerant pipe between the first heat exchange pipe section 31 and the second heat exchange pipe section 32, and the second end of the third branch pipe 36 is communicated with the refrigerant pipe between the third heat exchange pipe section 33 and the throttling element 4.

[0054] The group of on-off valves comprises a first on-off valve 81, a second on-off valve 82, a third on-off valve 83 and a fourth on-off valve 84. Preferably, the first on-off valve 81, the second on-off valve 82, the third on-off valve 83 and the fourth on-off valve 84 are all solenoid valves. Among them, the first on-off valve 81 is arranged in the first branch pipe 34, the second on-off valve 82 is arranged in the refrigerant pipe between the second heat exchange pipe section 32 and the third heat exchange pipe section 33, and is located between the second end of the first branch pipe 34 and the third heat exchange pipe section 33, the third on-off valve 83 is arranged in the second branch pipe 35, and the fourth on-off valve 84 is arranged in the third branch pipe 36 and is located between the first end of the second branch pipe 35 and the second end of the third branch pipe 36.

[0055] Under the above arrangement, by controlling the opening and closing of the first on-off valve 81, the second on-off valve 82, the third on-off valve 83 and the fourth on-off valve 84, different communication forms of the first heat exchange pipe section 31, the second heat exchange pipe section 32 and the third heat exchange pipe section 33 can be realized, so as to realize different heat exchange effects of the outdoor heat exchanger 3.

[0056] Continuing to refer to Figure 1and Figure 2 Preferably, the indoor heat exchanger 5 comprises an inner row heat exchanger pipe 51 and an outer row heat exchanger pipe 52 which are independent of each other, the first end of the inner row heat exchanger pipe 51 and the first end of the outer row heat exchanger pipe 52 are communicated with the throttling element 4 through the first liquid pipe 61 and the second liquid pipe 62 respectively, the second end of the inner row heat exchanger pipe 51 and the second end of the outer row heat exchanger pipe 52 are communicated with the second four-way valve 2 through the first gas pipe 63 and the second gas pipe 64 respectively. Preferably, a communication pipe 53 is further arranged between the first end of the inner row heat exchanger pipe 51 and the second end of the outer row heat exchanger pipe 52, the communication pipe 53 can be selectively communicated or blocked, more preferably, a first one-way valve 71 is arranged on the communication pipe 53, the first one-way valve 71 is arranged to be conducted when the refrigerant flows from the first end of the inner row heat exchanger pipe 51 to the second end of the outer row heat exchanger pipe 52. Preferably, the first liquid pipe 61 can be selectively communicated or blocked, more preferably, a second one-way valve 72 is arranged on the first liquid pipe 61, the second one-way valve 72 is arranged to be conducted when the refrigerant flows from the throttling element 4 to the first end of the inner row heat exchanger pipe 51. Preferably, the second gas pipe 64 can be selectively communicated or blocked, the first gas pipe 63 and the second gas pipe 64 can be selectively communicated or blocked. More preferably, a three-way control valve 73 is arranged on the second gas pipe 64, the first port 13 (the left end shown in FIG. 1), the second port 14 (the right end shown in FIG. 1) and the third port 15 (the upper end shown in FIG. 1) of the three-way control valve 73 are communicated with the second end of the outer row heat exchanger pipe 52, the second four-way valve 2 and the first gas pipe 63 respectively. Figure 1 Preferably, the second four-way valve 2 comprises a valve body 21, a first port 22 (the left end shown in FIG. 1), a second port 23 (the right end shown in FIG. 1) and a third port 24 (the upper end shown in FIG. 1) are arranged on the valve body 21, the first port 22 is communicated with the first liquid pipe 61, the second port 23 is communicated with the second liquid pipe 62, the third port 24 is communicated with the first gas pipe 63. Figure 1 Preferably, the throttling element 4 comprises a valve body 41, a first port 42 (the left end shown in FIG. 1), a second port 43 (the right end shown in FIG. 1) and a third port 44 (the upper end shown in FIG. 1) are arranged on the valve body 41, the first port 42 is communicated with the first liquid pipe 61, the second port 43 is communicated with the second liquid pipe 62, the third port 44 is communicated with the first gas pipe 63. Figure 1 Preferably, the first four-way valve 1 comprises a valve body 11, a first port 12 (the left end shown in FIG. 1), a second port 13 (the right end shown in FIG. 1) and a third port 14 (the upper end shown in FIG. 1) are arranged on the valve body 11, the first port 12 is communicated with the second gas pipe 64, the second port 13 is communicated with the second liquid pipe 62, the third port 14 is communicated with the second four-way valve 2.

[0057] With reference to Figure 1 and Figure 2 In the present application, the inner row heat exchanger pipe 51 comprises a first inner row heat exchanger pipe segment 511 and a second inner row heat exchanger pipe segment 512, the first end of the first inner row heat exchanger pipe segment 511 and the first end of the second inner row heat exchanger pipe segment 512 are communicated with the first liquid pipe 61 simultaneously, the second end of the first inner row heat exchanger pipe segment 511 and the second end of the second inner row heat exchanger pipe segment 512 are communicated with the first gas pipe 63 simultaneously. The outer row heat exchanger pipe 52 comprises a first outer row heat exchanger pipe segment 521 and a second outer row heat exchanger pipe segment 522, the first end of the first outer row heat exchanger pipe segment 521 and the first end of the second outer row heat exchanger pipe segment 522 are communicated with the second liquid pipe 62 simultaneously, the second end of the first outer row heat exchanger pipe segment 521 and the second end of the second outer row heat exchanger pipe segment 522 are communicated with the second gas pipe 64 simultaneously. The communication pipe 53 is provided with two, one of which is communicated between the first end of the first inner row heat exchanger pipe segment 511 and the second end of the first outer row heat exchanger pipe segment 521, the other is communicated between the first end of the second inner row heat exchanger pipe segment 512 and the second end of the second outer row heat exchanger pipe segment 522.

[0058] Next, with reference to Figure 4 and Figure 5The second embodiment of the air conditioner of this application will be described.

[0059] like Figure 4 and Figure 5 As shown, in another preferred embodiment, based on the first embodiment, the compressor 1 is a variable displacement compressor 1, which has two compression cylinders. Specifically, the variable displacement compressor 1 has a first compression cylinder 11 and a second compression cylinder 12 inside. The compressor 1 housing has four ports and an exhaust port 17. The first port 13 is connected to the air inlet of the first compression cylinder 11, the second port 14 is connected to the air outlet of the first compression cylinder 11, the third port 15 is connected to the air inlet of the second compression cylinder 12, the air outlet of the second compression cylinder 12 is connected to the exhaust port 17, and the fourth port 16 is connected to the exhaust port 17 through the inside of the housing.

[0060] The variable displacement compressor 1 is also equipped with a first four-way valve 9, which has four ports a, b, c, and d. Port a is connected to the fourth port 16, port b is connected to the second port 14, and port c is connected to the third port 15. A moving part is installed inside the first four-way valve 9. When the first four-way valve 9 is energized or de-energized, the moving part moves within the first four-way valve 9 to achieve connection and disconnection between different ports.

[0061] The second four-way valve 2 is connected to two gas-liquid separators 10, and the outlets of the two gas-liquid separators 10 are respectively connected to the two compression cylinders of the variable displacement compressor 1. Among them, the outlet of one gas-liquid separator 10 is directly connected to the first port 13, and the outlet of the other gas-liquid separator 10 is connected through the fourth interface d of the first four-way valve 9, thereby indirectly achieving connection with the third port 15.

[0062] Under the above configuration, the variable displacement compressor 1 operates in two-cylinder and two-stage modes. See also... Figure 4 When the first four-way valve 9 is powered on, it operates in two-stage mode. In this mode, the two compression cylinders of the variable-capacity compressor 1 compress the refrigerant sequentially. Specifically, the first port a and the fourth port d of the first four-way valve 9 are separated by a moving part. The refrigerant discharged from the outdoor heat exchanger 3 passes through one of the gas-liquid separators 10 and then enters the first compression cylinder 11 through the first port 13. After being compressed by the first compression cylinder 11, it is discharged through the second port 14. Then, after passing through the second port b and the third port c of the first four-way valve 9, it enters the second compression cylinder 12 through the third port 15. After secondary compression by the second compression cylinder 12, it is discharged through the exhaust port 17. In this mode, the variable-capacity compressor 1 can achieve a higher compression ratio at a lower operating frequency, thereby meeting the condensing temperature requirements and ensuring the cooling effect and efficiency of the air conditioner.

[0063] See Figure 5In contrast, when the first four-way valve 9 is de-energized, the variable capacity compressor 1 is in a two-cylinder mode, in which two compression cylinders of the variable capacity compressor 1 compress refrigerant separately. Specifically, a portion of refrigerant discharged from the outdoor heat exchanger 3 passes through one of the gas-liquid separators 10, enters the first compression cylinder 11 from the first port 13, is compressed by the first compression cylinder 11, is discharged from the second port 14, passes through the second interface b and the first interface a of the first four-way valve 9, enters the housing, and is finally discharged from the discharge port 17. Another portion of the refrigerant passes through the other gas-liquid separator 10, passes through the fourth interface d and the third interface c of the first four-way valve 9, enters the second compression cylinder 12 from the third port 15, is compressed by the second compression cylinder 12, and is discharged from the discharge port 17. The variable capacity compressor 1 is in the two-cylinder mode, and the frequency is lower at the same discharge capacity, so that the high pressure of the air conditioning system is lowered, the low pressure is increased, and the compression ratio of the compressor 1 is reduced.

[0064] Those skilled in the art can understand that the above setting mode of the air conditioner is only preferred, and those skilled in the art can adjust the structure of the air conditioner without departing from the principles of the present application, so that the present application is applicable to more specific application scenarios. For example, although the above air conditioner is introduced in combination with the second four-way valve 2, this implementation is not immutable, and those skilled in the art can also selectively omit the setting of the second four-way valve 2, so that the air conditioner becomes a single cold or single warm air conditioner. For another example, the specific form of the throttling element 4 is not limited by the present application, and the throttling element 4 can also be a capillary tube or a thermal expansion valve, etc. For another example, the number, setting mode, branch pipe number, connection mode, number and setting position of the on-off valve in the on-off valve group of the heat exchange pipe section of the outdoor heat exchanger 3 can be adjusted by those skilled in the art to adapt to more specific application scenarios. For example, those skilled in the art can increase or decrease the number, setting position, and communication mode of the heat exchange pipe section; or, the number and communication relationship of the branch pipe can also be increased or decreased; or, the number and setting position of the on-off valve can also be increased or decreased. In short, as long as the adjustment of the communication form of the heat exchange pipe section can be realized by controlling the opening and closing of the on-off valve in the on-off valve group, such changes do not deviate from the principles of the present application. For another example, the switching between the double-cylinder mode and the double-stage mode of the variable displacement compressor 1 can not be through the first four-way valve 9, but a plurality of valve groups can be set to realize the switching by controlling the opening and closing of each valve in the valve group. For another example, the specific structure of the variable displacement compressor 1 is not immutable, and those skilled in the art can adjust the structure of the variable displacement compressor 1 under the premise of realizing the switching between the double-cylinder mode and the double-stage mode, such as changing the number, position, and connection relationship of the ports. For another example, the setting of the gas-liquid separator 10 is not necessary, and those skilled in the art can choose according to specific needs. For another example, the communication pipeline 53 can selectively communicate or block, and in addition to being realized through the first one-way valve 71, it can also be realized through a solenoid valve, an electronic expansion valve, etc. Similarly, the second one-way valve 72 on the first liquid pipe 61 can also be replaced by a solenoid valve or an electronic expansion valve. For another example, the second gas pipe 64 can selectively communicate or block, and the first gas pipe 63 and the second gas pipe 64 can selectively communicate or block, which can also be realized by using two separate solenoid valves. For another example, the specific structure of the indoor heat exchanger 5 is not immutable, and those skilled in the art can adjust it, such as increasing the number of the inner discharge heat exchange pipeline 51 and the outer discharge heat exchange pipeline 52. For another example, the specific composition of the inner discharge heat exchange pipeline 51 and the outer discharge heat exchange pipeline 52 is not unique, and those skilled in the art can choose the number of heat exchange pipe sections based on specific application scenarios, and the number of communication pipelines 53 also needs to be adjusted accordingly.

[0065] The following refers to Figure 3 The split control method of the air conditioner of the present application is introduced.

[0066] As Figure 3 shown, corresponding to the first embodiment of the air conditioner, the air conditioner of the present application includes a split control method comprising:

[0067] S101, obtaining the operation mode of the air conditioner. In the present application, the operation mode of the air conditioner includes the cooling mode and the heating mode, and the operation mode of the air conditioner is obtained during the operation of the air conditioner.

[0068] S103, determining the communication form of the outdoor heat exchanger and the indoor heat exchanger based on the operation mode. For example, in different operation modes, the communication form of the indoor heat exchanger and the outdoor heat exchanger is different, so that the split form of the indoor heat exchanger and the outdoor heat exchanger can be switched according to different application scenarios, such as controlling the on-off state of the valve group, the communication state of the three-way control valve, the communication state of the communication pipeline, the first liquid pipe, the second gas pipe, etc., so as to facilitate the efficient operation of the air conditioner.

[0069] S105, controlling the air conditioner to work based on the communication form. For example, after determining the communication form of the indoor heat exchanger and the outdoor heat exchanger, the air conditioner is controlled to switch to the communication form and operate in the state.

[0070] The technical scheme of the present application can determine the communication form of the outdoor heat exchanger and the indoor heat exchanger based on the operation mode, switch the split form of the indoor heat exchanger and the outdoor heat exchanger according to different application scenarios, realize adaptive coupling change of split, and improve the heat exchange efficiency and effect of the air conditioner. Moreover, the above technical scheme is simple in structure, does not occupy additional space, and is beneficial to assembly and application.

[0071] The present embodiment will be described in detail below.

[0072] In one embodiment, the step of "determining the communication form of the outdoor heat exchanger and the indoor heat exchanger based on the operation mode" further comprises: when the operation mode is the cooling mode, obtaining the outdoor environment temperature; determining the communication form of the outdoor heat exchanger and the indoor heat exchanger based on the outdoor environment temperature.

[0073] Specifically, when the outdoor environment temperature is less than a first preset temperature threshold, the first on-off valve, the third on-off valve and the fourth on-off valve are closed, the second on-off valve is opened, the communication pipeline is blocked, the first liquid pipe is communicated, the second gas pipe is communicated, and the first gas pipe and the second gas pipe are blocked. When the outdoor environment temperature is greater than or equal to the first preset temperature threshold, the first on-off valve and the third on-off valve are opened, the second on-off valve and the fourth on-off valve are closed, the communication pipeline is blocked, the first liquid pipe is communicated, the second gas pipe is communicated, and the first gas pipe and the second gas pipe are blocked.

[0074] For example, the first preset temperature threshold is 29℃. When the air conditioner is in cooling mode, the outdoor ambient temperature is first acquired. When the outdoor ambient temperature Tao<29℃, the outdoor unit load is small, and the heat exchange amount is small. At this time, the first on-off valve is controlled to be closed, the second on-off valve is controlled to be opened, the third on-off valve is controlled to be closed, and the fourth on-off valve is controlled to be closed. The refrigerant is discharged from the compressor, passes through the second four-way valve, enters the upper part of the first heat exchange pipe section of the first heat exchange pipe section, is discharged from the lower part of the first heat exchange pipe section, enters the lower part of the second heat exchange pipe section of the second heat exchange pipe section, is discharged from the upper part of the second heat exchange pipe section, enters the upper part of the third heat exchange pipe section of the third heat exchange pipe section, and is finally discharged from the lower part of the third heat exchange pipe section to the throttling element. In this mode, the refrigerant flow of the outdoor heat exchanger is one-in-one-out, the flow is long, the supercooling end is large, the flow rate is fast, the efficiency of the outdoor heat exchanger is high, the convective heat exchange amount is large, the power is low, and the energy efficiency is high.

[0075] Then, the first port and the second port of the three-way control valve are controlled to be communicated, and the third port is controlled to be disconnected, that is, the second gas pipe is communicated, and the communication between the second gas pipe and the first gas pipe is blocked. At this time, the refrigerant passes through the throttling of the throttling element, enters the inner discharge heat exchange pipeline and the outer discharge heat exchange pipeline of the indoor heat exchanger through the first liquid pipe and the second liquid pipe respectively, is discharged from the first gas pipe and the second gas pipe after heat exchange with indoor air, is converged before the second four-way valve and flows into the compressor. In this mode, the flow path of the refrigerant is two-in-two-out, the flow is divided, the pressure drop is small, and the heat exchange effect is good.

[0076] It should be noted that the refrigerant enters the inner discharge heat exchange pipeline and the outer discharge heat exchange pipeline after passing through the first liquid pipe and the second liquid pipe. Since the indoor heat exchanger acts as an evaporator in the cooling mode, the temperature and pressure of the refrigerant inside the evaporator gradually increase from the inlet to the outlet during the heat absorption and evaporation process. Therefore, the refrigerant entering the inner discharge heat exchange pipeline directly flows out to the first gas pipe without flowing to the outlet of the outer discharge heat exchange pipeline through the first check valve, because the outlet pressure of the outer discharge heat exchange pipeline is higher than the inlet pressure of the inner discharge heat exchange pipeline.

[0077] When the outdoor ambient temperature Tao≥29℃, the outdoor unit load is large, and the heat exchange amount is large. At this time, the first on-off valve is controlled to be opened, the second on-off valve is controlled to be closed, the third on-off valve is controlled to be opened, and the fourth on-off valve is controlled to be closed. The refrigerant discharged from the compressor is divided into two parts. One part of the refrigerant enters the upper part of the first heat exchange pipe section of the first heat exchange pipe section, and is discharged from the lower part of the first heat exchange pipe section. The other part of the refrigerant enters the upper part of the second heat exchange pipe section of the second heat exchange pipe section, and is discharged from the lower part of the second heat exchange pipe section. The refrigerant discharged from the first heat exchange pipe section and the second heat exchange pipe section is combined, enters the upper part of the third heat exchange pipe section of the third heat exchange pipe section, and is finally discharged from the lower part of the third heat exchange pipe section to the third throttling element. In this mode, the refrigerant flow is two-in-one-out, the flow is short, the supercooling end is small, the flow rate is slow, and it is suitable for medium-high temperature and high frequency conditions. This kind of flow division is suitable for large load, high outdoor environment temperature, low condensation temperature, and low power.

[0078] Then, the first port and the second port of the three-way control valve are controlled to be communicated, and the third port is disconnected, that is, the second gas pipe is communicated, and the second gas pipe is blocked between the first gas pipe. At this time, the refrigerant passes through the throttling of the throttling element and enters the inner and outer heat exchange pipe lines of the indoor heat exchanger through the first liquid pipe and the second liquid pipe, respectively, and flows out from the first gas pipe and the second gas pipe after heat exchange with indoor air, and converges before the second four-way valve and flows into the compressor. In this mode, the flow path of the refrigerant is two-in and two-out, the flow is divided, the pressure drop is small, and the heat exchange effect is good.

[0079] In this way, in the refrigeration mode, the communication form of the indoor heat exchanger and the outdoor heat exchanger is controlled according to the outdoor environment temperature, which can adapt the running state of the air conditioner to the environment, and is more conducive to improving the overall energy efficiency of the air conditioner.

[0080] Of course, the above control method is only preferred, and those skilled in the art can adjust it. For example, the size of the first preset temperature threshold can be adjusted by those skilled in the art based on specific application scenarios.

[0081] In an embodiment, the step of "determining the communication form of the outdoor heat exchanger and the indoor heat exchanger based on the running mode" further comprises: when the running mode is the heating mode, the first on-off valve, the second on-off valve and the fourth on-off valve are opened, the third on-off valve is closed, the communication pipe line is communicated, the first liquid pipe is blocked, the second gas pipe is blocked, and the first gas pipe is communicated with the second gas pipe.

[0082] For example, when the running mode is the heating mode, the indoor heat exchanger acts as a condenser, and the outdoor heat exchanger acts as an evaporator. At this time, the first port of the three-way control valve is controlled to be blocked, and the second port and the third port are communicated, that is, the second gas pipe is blocked, and the second gas pipe is communicated with the first gas pipe. At this time, the refrigerant in the second gas pipe is divided into two paths after converging with the first gas pipe to enter the first inner heat exchange pipe section and the second inner heat exchange pipe section from one end of the inner heat exchange pipe line, and after heat exchange with indoor air, the refrigerant enters the first outer heat exchange pipe section and the second outer heat exchange pipe section through the communication pipe line due to the presence of the second one-way valve, and converges to the second liquid pipe after heat exchange with indoor air. In this mode, the flow path of the refrigerant in the indoor heat exchanger is two-in and one-out, the heat exchanger acts as a condenser, the two-in and one-out mode has a large temperature difference for flow heat exchange, a large supercooling degree, and a low air conditioner power.

[0083] Then the first on-off valve is controlled to open, the second on-off valve is controlled to open, the third on-off valve is controlled to close, and the fourth on-off valve is controlled to open. The refrigerant enters the outdoor heat exchanger from one end thereof after throttling by the throttling element, and is divided into three flow paths. One flow path passes through the third heat exchange pipe section to exchange heat with outdoor air, and returns to the compressor through the second on-off valve and the first branch pipe. One flow path passes through the third branch pipe and the fourth on-off valve, and is divided into two flow paths. One of the two flow paths passes through the first heat exchange pipe section to exchange heat with outdoor air, and returns to the compressor. The other of the two flow paths passes through the second heat exchange pipe section to exchange heat with outdoor air, and then returns to the compressor through the first on-off valve. In this mode, the flow path of the refrigerant in the outdoor heat exchanger is three-in and three-out. As an evaporator, the refrigerant is divided into multiple flow paths, the pressure drop is small, and the heat exchange effect is good.

[0084] In this way, in the heating mode, by controlling the connection forms of the indoor heat exchanger and the outdoor heat exchanger, the indoor heat exchanger and the outdoor heat exchanger can both maintain high heat exchange efficiency, thereby improving the operating energy efficiency of the entire machine.

[0085] Hereinafter, the application will be described in detail with reference to the accompanying drawings. Figure 6 Another preferred embodiment of the split control method of the application is introduced.

[0086] As shown in Figure 6 According to the second embodiment of the air conditioner, the split control method of the application includes:

[0087] S201, obtaining the operating mode of the air conditioner. In the application, the operating mode of the air conditioner includes a cooling mode and a heating mode. During the operation of the air conditioner, the operating mode of the air conditioner is obtained.

[0088] S203, determining the connection forms of the outdoor heat exchanger and the indoor heat exchanger, and the working mode of the variable displacement compressor based on the operating mode. For example, in different working modes, the connection forms of the indoor heat exchanger and the outdoor heat exchanger are different. In this way, the split forms of the indoor heat exchanger and the outdoor heat exchanger can be switched according to different application scenarios, such as controlling the on-off state of the on-off valve group, the connection state of the three-way control valve, the connection state of the connection pipeline, the first liquid pipe, the second gas pipe, and the like, thereby facilitating the efficient operation of the air conditioner. The working mode of the variable displacement compressor includes a double-cylinder mode and a double-stage mode. In the double-cylinder mode, the two compression cylinders of the variable displacement compressor compress the refrigerant separately. In the double-stage mode, the two compression cylinders of the variable displacement compressor compress the refrigerant in sequence. In different operating modes, the working mode of the compressor is different. Based on the operating mode of the air conditioner, the working mode of the compressor is determined, which is conducive to improving the overall operating effect of the air conditioner.

[0089] S205, control the air conditioner to work based on the connection form and the working mode. For example, after determining the connection form of the indoor heat exchanger and the outdoor heat exchanger and the working mode of the compressor, the air conditioner is controlled to switch to the corresponding connection form, the compressor is switched to the corresponding working mode, and the air conditioner is operated in this state.

[0090] The technical solution of the present application can determine the connection form of the outdoor heat exchanger and the indoor heat exchanger and the working mode of the variable displacement compressor based on the operating mode of the air conditioner, switch the shunt form of the indoor heat exchanger and the outdoor heat exchanger according to different application scenarios, realize adaptive coupling change of shunting, and improve the heat exchange efficiency and effect of the air conditioner. By setting the variable displacement compressor, the variable displacement compressor can be used to switch multiple working modes during shunting, so that the air conditioner runs more efficiently and stably. Moreover, the above technical solution has simple structure and does not occupy additional space, which is beneficial to assembly and application.

[0091] The present embodiment will be described in detail below.

[0092] In one possible implementation, the step of "determining the connection form of the outdoor heat exchanger and the indoor heat exchanger and the working mode of the variable displacement compressor based on the operating mode" further includes: when the operating mode is the cooling mode, obtaining an outdoor environment temperature and a first condensing pressure of the outdoor heat exchanger; determining the connection form of the outdoor heat exchanger and the indoor heat exchanger based on the outdoor environment temperature; and determining the working mode of the variable displacement compressor based on the first condensing pressure.

[0093] Specifically, the step of "determining the connection form of the outdoor heat exchanger and the indoor heat exchanger based on the outdoor environment temperature" further includes: when the outdoor environment temperature is less than a first preset temperature threshold, the first on-off valve, the third on-off valve and the fourth on-off valve are closed, the second on-off valve is opened, the connection pipeline is blocked, the first liquid pipe is connected, the second gas pipe is connected, and the first gas pipe and the second gas pipe are blocked. When the outdoor environment temperature is greater than or equal to the first preset temperature threshold, the first on-off valve and the third on-off valve are opened, the second on-off valve and the fourth on-off valve are closed, the connection pipeline is blocked, the first liquid pipe is connected, the second gas pipe is connected, and the first gas pipe and the second gas pipe are blocked.

[0094] For example, the first preset temperature threshold is 29℃. When the air conditioner is in cooling mode, the outdoor ambient temperature is first acquired. When the outdoor ambient temperature Tao < 29℃, the outdoor unit load is small, and the heat exchange amount is small. At this time, the first on-off valve is controlled to be closed, the second on-off valve is controlled to be opened, the third on-off valve is controlled to be closed, and the fourth on-off valve is controlled to be closed. The refrigerant is discharged from the compressor, passes through the second four-way valve, enters the upper part of the first heat exchange pipe section from the first heat exchange pipe section, is discharged from the lower part of the first heat exchange pipe section, enters the lower part of the second heat exchange pipe section from the second heat exchange pipe section, is discharged from the upper part of the second heat exchange pipe section, enters the upper part of the third heat exchange pipe section from the third heat exchange pipe section, and is finally discharged from the lower part of the third heat exchange pipe section to the throttling element. In this mode, the refrigerant flow path of the outdoor heat exchanger is one-in-one-out, the flow path is long, the supercooling end is large, the flow rate is fast, the outdoor heat exchanger has high efficiency, large convective heat exchange amount, low power, and high energy efficiency.

[0095] Then, the first port and the second port of the three-way control valve are controlled to be communicated, and the third port is controlled to be disconnected, that is, the second gas pipe is communicated, and the communication between the second gas pipe and the first gas pipe is blocked. At this time, the refrigerant passes through the throttling of the throttling element, enters the inner discharge heat exchange pipeline and the outer discharge heat exchange pipeline of the indoor heat exchanger from the first liquid pipe and the second liquid pipe respectively, is discharged from the first gas pipe and the second gas pipe after heat exchange with indoor air, is converged before the second four-way valve and flows into the compressor. In this mode, the refrigerant flow path is two-in-two-out, the flow is divided, the pressure drop is small, and the heat exchange effect is good.

[0096] It should be noted that the refrigerant enters the inner discharge heat exchange pipeline and the outer discharge heat exchange pipeline after passing through the first liquid pipe and the second liquid pipe. Since the indoor heat exchanger acts as an evaporator in the cooling mode, the temperature and pressure of the refrigerant inside the evaporator gradually increase from the inlet to the outlet during the heat absorption and evaporation process. Therefore, the refrigerant entering the inner discharge heat exchange pipeline directly flows out to the first gas pipe without flowing to the outlet of the outer discharge heat exchange pipeline through the first check valve, because the outlet pressure of the outer discharge heat exchange pipeline is higher than the inlet pressure of the inner discharge heat exchange pipeline.

[0097] When the outdoor ambient temperature Tao ≥ 29℃, the outdoor unit load is large, and the heat exchange amount is large. At this time, the first on-off valve is controlled to be opened, the second on-off valve is controlled to be closed, the third on-off valve is controlled to be opened, and the fourth on-off valve is controlled to be closed. The refrigerant discharged from the compressor is divided into two parts. One part of the refrigerant enters the upper part of the first heat exchange pipe section from the first heat exchange pipe section, and is discharged from the lower part of the first heat exchange pipe section. The other part of the refrigerant enters the upper part of the second heat exchange pipe section from the second heat exchange pipe section, and is discharged from the lower part of the second heat exchange pipe section. The refrigerant discharged from the first heat exchange pipe section and the second heat exchange pipe section is combined, enters the upper part of the third heat exchange pipe section from the third heat exchange pipe section, and is finally discharged from the lower part of the third heat exchange pipe section to the third throttling element. In this mode, the refrigerant flow path is two-in-one-out, the flow path is short, the supercooling end is small, the flow rate is slow, and it is suitable for medium-high temperature and high frequency conditions. This kind of flow division is suitable for large load, high outdoor ambient temperature, low condensation temperature, and low power.

[0098] Then, the first port and the second port of the three-way control valve are communicated, and the third port is disconnected, that is, the second gas pipe is communicated, and the second gas pipe is blocked from the first gas pipe. At this time, the refrigerant flows into the indoor heat exchanger through the throttling element and the first liquid pipe and the second liquid pipe, and flows out from the first gas pipe and the second gas pipe after heat exchange with indoor air, and flows into the compressor after converging in front of the second four-way valve. In this mode, the refrigerant flow path is two-in and two-out, the flow is divided, the pressure drop is small, and the heat exchange effect is good.

[0099] In this way, in the refrigeration mode, the communication form of the indoor heat exchanger and the outdoor heat exchanger is controlled according to the outdoor environment temperature, so that the running state of the air conditioner is adapted to the environment, and the overall energy efficiency of the air conditioner is more conducive to being improved.

[0100] Of course, the above control mode is only preferred, and those skilled in the art can adjust it. For example, the size of the first preset temperature threshold can be adjusted by those skilled in the art based on specific application scenarios.

[0101] In one possible implementation, the step of "determining the working mode of the variable displacement compressor based on the first condensing pressure" further includes: if the first condensing pressure is greater than a first preset pressure threshold, determining the working mode of the variable displacement compressor as a two-stage mode; and if the first condensing pressure is less than or equal to the first preset pressure threshold, determining the working mode of the variable displacement compressor as a two-cylinder mode.

[0102] For example, the first condensing pressure can be obtained by setting a pressure sensor on the outdoor heat exchanger, and the pressure value reflects the heat exchange state of the outdoor heat exchanger. The first preset pressure threshold can be determined by comparing the outdoor environment temperature with the first preset pressure threshold, or can be determined based on experiments, experience, fitting formulas, etc. After obtaining the first condensing pressure, the difference or ratio between the first condensing pressure and the first preset pressure threshold is calculated to calculate the size of the two. Specifically, when the first condensing pressure is less than or equal to the first preset pressure threshold, the condensing pressure in the outdoor heat exchanger is not high, and the heat exchange capacity of the outdoor heat exchanger is not large. At this time, the compressor is controlled to run in a two-cylinder mode, which can achieve a larger exhaust volume at the same frequency, thereby improving the operation efficiency and refrigeration effect. When the first condensing pressure is greater than the first preset pressure threshold, it proves that the condensing pressure in the outdoor heat exchanger is too high, and at this time the heat exchange capacity of the outdoor heat exchanger is large, and the working mode of the compressor is switched to a two-stage mode at this time. A larger compression ratio can be achieved at a lower operating frequency, thereby meeting the condensing temperature requirement and ensuring the refrigeration effect and efficiency of the air conditioner.

[0103] Thus, the working mode of the compressor is determined based on the first condensing pressure of the outdoor heat exchanger in the refrigeration mode, so that the compressor can be matched with the heat exchange state of the current outdoor heat exchanger, and the energy efficiency of the air conditioning system can be improved.

[0104] In a possible implementation, the step of determining the connection mode of the outdoor heat exchanger and the indoor heat exchanger based on the working mode further includes: when the working mode is the heating mode, the first on-off valve, the second on-off valve, and the fourth on-off valve are opened, the third on-off valve is closed, the connection pipeline is connected, the first liquid pipe is blocked, the second gas pipe is blocked, and the first gas pipe is connected with the second gas pipe.

[0105] For example, when the working mode is the heating mode, the indoor heat exchanger functions as a condenser, and the outdoor heat exchanger functions as an evaporator. At this time, the first port of the three-way control valve is blocked, the second port is connected with the third port, that is, the second gas pipe is blocked, and the second gas pipe is connected with the first gas pipe. At this time, the refrigerant in the second gas pipe is divided into two paths after converging with the first gas pipe, enters the first indoor heat exchange pipe section and the second indoor heat exchange pipe section from one end of the indoor heat exchange pipeline, and is heated exchanged with indoor air. After that, the refrigerant enters the first outdoor heat exchange pipe section and the second outdoor heat exchange pipe section through the connection pipeline due to the presence of the second one-way valve, and is heated exchanged with indoor air. After that, the refrigerant converges to the second liquid pipe and is discharged to the throttling element. In this mode, the flow path of the refrigerant in the indoor heat exchanger is two-in and one-out, the heat exchanger functions as a condenser, the two-in and one-out mode has a large temperature difference of convective heat exchange and a large supercooling degree, and the air conditioner has low power.

[0106] Then, the first on-off valve is opened, the second on-off valve is opened, the third on-off valve is closed, and the fourth on-off valve is opened. After the refrigerant is throttled by the throttling element, the refrigerant enters one end of the outdoor heat exchanger and is divided into three flow paths. One flow path is heated exchanged with outdoor air through the third heat exchange pipe section and is returned to the compressor through the second on-off valve and the first branch pipe. One flow path is divided into two paths after passing through the third branch pipe and the fourth on-off valve. One of the two paths is heated exchanged with outdoor air through the first heat exchange pipe section and is returned to the compressor. The other path is heated exchanged with outdoor air through the second heat exchange pipe section and is returned to the compressor after passing through the first on-off valve. In this mode, the flow path of the refrigerant in the outdoor heat exchanger is three-in and three-out, the refrigerant is divided into multiple paths, the pressure drop is small, and the heat exchange effect is good.

[0107] Thus, in the heating mode, the connection mode of the indoor heat exchanger and the outdoor heat exchanger is controlled, so that the indoor heat exchanger and the outdoor heat exchanger can both maintain high-efficiency heat exchange, and the energy efficiency of the entire air conditioning system can be improved.

[0108] In a possible implementation, the step of determining the working mode of the variable displacement compressor based on the operation mode further includes: obtaining a second condensing pressure of the indoor heat exchanger when the operation mode is the heating mode; and determining the working mode of the variable displacement compressor based on the second condensing pressure.

[0109] Specifically, if the second condensing pressure is greater than a second preset pressure threshold, the working mode of the variable displacement compressor is determined as the two-stage mode; and if the second condensing pressure is less than or equal to the second preset pressure threshold, the working mode of the variable displacement compressor is determined as the two-cylinder mode.

[0110] For example, the second condensing pressure can be obtained by arranging a pressure sensor on the indoor heat exchanger, and the pressure value reflects the heat exchange state of the indoor heat exchanger. The second preset pressure threshold can be determined by a comparison table between the indoor environment temperature and the second preset pressure threshold, or can be determined based on experiments, experience, fitting formula, etc. After obtaining the second condensing pressure, the difference or ratio between the second condensing pressure and the second preset pressure threshold is calculated to calculate the size of the two. Specifically, when the second condensing pressure is less than or equal to the second preset pressure threshold, the condensing pressure in the indoor heat exchanger is not high, and the heat exchange capacity of the indoor heat exchanger is not large. At this time, the compressor is controlled to operate in the two-cylinder mode, which can achieve a larger exhaust capacity at the same frequency, thereby improving the operation efficiency and refrigeration effect. When the second condensing pressure is greater than the second preset pressure threshold, it proves that the condensing pressure in the indoor heat exchanger is too high, and at this time the heat exchange capacity of the indoor heat exchanger is large. At this time, the working mode of the compressor is switched to the two-stage mode, which can achieve a larger compression ratio at a lower operating frequency, thereby meeting the condensing temperature requirement and ensuring the refrigeration effect and efficiency of the air conditioner.

[0111] In this way, in the heating mode, the working mode of the compressor is determined based on the second condensing pressure of the indoor heat exchanger, which can make the compressor more matched with the current heat exchange state of the indoor heat exchanger, and improve the energy efficiency of the air conditioning system.

[0112] Although the above embodiments describe the steps in the above order, those skilled in the art can understand that, in order to achieve the effect of the embodiments, the different steps do not have to be executed in such an order, but can be executed simultaneously (in parallel) or in a reversed order, and these simple changes are within the protection scope of the present application.

[0113] In addition, those skilled in the art can understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments means to be within the scope of the present application and form different embodiments. For example, in the claims of the present application, any one of the claimed embodiments can be used in any combination.

[0114] So far, the technical solution of the present application has been described in combination with the preferred embodiments shown in the drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after these changes or replacements will all fall within the protection scope of the present application.

Claims

1. A method for controlling the flow of an air conditioner, characterized in that, The air conditioner includes a variable-capacity compressor, an outdoor heat exchanger, a throttling element, and an indoor heat exchanger. The variable-capacity compressor has two compression cylinders. The indoor heat exchanger includes independent internal and external heat exchange pipes. The first ends of the internal and external heat exchange pipes are connected to the throttling element via a first liquid pipe and a second liquid pipe, respectively. The second ends of the internal and external heat exchange pipes are connected to the variable displacement compressor via a first gas pipe and a second gas pipe, respectively. A connecting pipe is also provided between the first end of the internal heat exchange pipe and the second end of the external heat exchange pipe. This connecting pipe can be selectively connected or blocked. The first liquid pipe can be selectively connected or blocked, the second gas pipe can be selectively connected or blocked, and the first gas pipe and the second gas pipe can be selectively connected or blocked. The outdoor heat exchanger includes a first heat exchange tube section, a second heat exchange tube section, and a third heat exchange tube section connected in sequence. The outdoor heat exchanger also includes a first branch pipe, a second branch pipe, and a third branch pipe. A first end of the first branch pipe is connected to a refrigerant pipe between the variable capacity compressor and the first heat exchange tube section. A second end of the first branch pipe is connected to a refrigerant pipe between the second heat exchange tube section and the third heat exchange tube section. A first end of the second branch pipe is connected to the third branch pipe, and a second end of the second branch pipe is connected to the end of the third heat exchange tube section closest to the second heat exchange tube section. A first end of the third branch pipe is connected to a refrigerant pipe between the first heat exchange tube section and the second heat exchange tube section. A second end of the third branch pipe is connected to a refrigerant pipe between the third heat exchange tube section and the throttling element. The outdoor heat exchanger is also equipped with an on / off valve assembly, which includes a first on / off valve, a second on / off valve, a third on / off valve, and a fourth on / off valve. The first on / off valve is located on the first branch pipe. The second on / off valve is located on the refrigerant pipe between the second heat exchange pipe section and the third heat exchange pipe section, and is situated between the second end of the first branch pipe and the third heat exchange pipe section. The third on / off valve is located on the second branch pipe. The fourth on / off valve is located on the third branch pipe, and is situated between the first end of the second branch pipe and the second end of the third branch pipe. The diversion control method includes: Obtain the operating mode of the air conditioner; Based on the operating mode, the connection form between the outdoor heat exchanger and the indoor heat exchanger, as well as the operating mode of the variable capacity compressor, are determined. Based on the connection type and the working mode, control the air conditioner to work; The variable capacity compressor has two operating modes: a dual-cylinder mode and a two-stage mode. In the dual-cylinder mode, the two compression cylinders of the variable capacity compressor compress the refrigerant separately. In the two-stage mode, the two compression cylinders of the variable capacity compressor compress the refrigerant sequentially. The step of "determining the connection form between the outdoor heat exchanger and the indoor heat exchanger based on the operating mode" further includes: When the operating mode is heating mode, the first on / off valve, the second on / off valve, and the fourth on / off valve are open, the third on / off valve is closed, the connecting pipeline is connected, the first liquid pipe is blocked, the second gas pipe is blocked, and the first gas pipe and the second gas pipe are connected.

2. The air conditioning shunt control method according to claim 1, characterized in that, The step of "determining the connection configuration of the outdoor heat exchanger and the indoor heat exchanger, and the operating mode of the variable capacity compressor based on the operating mode" further includes: When the operating mode is cooling mode, the outdoor ambient temperature and the first condensing pressure of the outdoor heat exchanger are obtained; Based on the outdoor ambient temperature, determine the connection configuration between the outdoor heat exchanger and the indoor heat exchanger; The operating mode of the variable capacity compressor is determined based on the first condensing pressure.

3. The air conditioning shunt control method according to claim 2, characterized in that, The step of "determining the connection configuration of the outdoor heat exchanger and the indoor heat exchanger based on the outdoor ambient temperature" further includes: When the outdoor ambient temperature is less than a first preset temperature threshold, the first on / off valve, the third on / off valve, and the fourth on / off valve are closed, the second on / off valve is opened, the connecting pipeline is blocked, the first liquid pipe is connected, the second gas pipe is connected, and the connection between the first gas pipe and the second gas pipe is blocked.

4. The air conditioning shunt control method according to claim 3, characterized in that, The step of "determining the connection configuration of the outdoor heat exchanger and the indoor heat exchanger based on the outdoor ambient temperature" further includes: When the outdoor ambient temperature is greater than or equal to the first preset temperature threshold, the first on / off valve and the third on / off valve are opened, the second on / off valve and the fourth on / off valve are closed, the connecting pipeline is blocked, the first liquid pipe is connected, the second gas pipe is connected, and the connection between the first gas pipe and the second gas pipe is blocked.

5. The air conditioning shunt control method according to claim 2, characterized in that, The step of "determining the operating mode of the variable capacity compressor based on the first condensing pressure" further includes: If the first condensing pressure is greater than the first preset pressure threshold, then the working mode of the variable capacity compressor is determined to be two-stage mode; If the first condensing pressure is less than or equal to the first preset pressure threshold, then the operating mode of the variable capacity compressor is determined to be dual-cylinder mode.

6. The air conditioning shunt control method according to claim 1, characterized in that, The step of "determining the operating mode of the variable capacity compressor based on the operating mode" further includes: When the operating mode is heating mode, the second condensing pressure of the indoor heat exchanger is obtained; The operating mode of the variable capacity compressor is determined based on the second condensing pressure.

7. The air conditioning shunt control method according to claim 6, characterized in that, The step of "determining the operating mode of the variable capacity compressor based on the condensing pressure" further includes: If the second condensing pressure is greater than the second preset pressure threshold, then the operating mode of the variable capacity compressor is determined to be two-stage mode; If the second condensing pressure is less than or equal to the second preset pressure threshold, then the operating mode of the variable capacity compressor is determined to be the dual-cylinder mode.

8. The air conditioning system's shunt control method according to any one of claims 1 to 7, characterized in that, A three-way control valve is provided on the second gas pipe, wherein the first port, the second port, and the third port of the three-way control valve are respectively connected to the second end of the external heat exchange pipeline, the variable capacity compressor, and the first gas pipe; and / or A first check valve is provided on the connecting pipeline, and the first check valve is configured to open when the refrigerant flows from the first end of the internal heat exchange pipeline to the second end of the external heat exchange pipeline; and / or A second one-way valve is provided on the first liquid pipe, and the second one-way valve is configured to open when the refrigerant flows from the throttling element to the first end of the internal heat exchange pipe.

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