Air conditioner and refrigeration control method thereof

Abstract

The present invention relates to the field of air-conditioning technology, and in particular to an air conditioner and a refrigeration control method for the air conditioner. The present application aims to solve the problems of complex systems and fixed processes in existing heat exchanger diversion means. To this end, the air conditioner of the present application includes a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger. The compressor, the outdoor heat exchanger, the throttling device and the indoor heat exchanger are connected through a refrigerant pipeline. The outdoor heat exchanger includes a plurality of heat exchange pipe sections. An on-off valve group is also provided in the outdoor heat exchanger. The on-off valve group includes a plurality of on-off valves. The on-off valve group is configured to control the connection form between the plurality of heat exchange pipe sections. The on-off valve group can be used to adjust the connection form between the plurality of heat exchange pipe sections, thereby realizing the adjustment of a plurality of diversion modes of the outdoor heat exchanger and the adaptation to a variety of application scenarios without significantly increasing the complexity of the system.

Description

Technical Field

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

[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. While current heat exchangers use the same pipes and lengths for both cooling and heating, the refrigerant state inside the pipes, the temperature difference between the pipes inside and the environment, the refrigerant flow rate, pressure drop, and heat transfer coefficient all differ during cooling and heating.

[0003] The applicant has found through research that when the heat exchanger is used as a condenser, the gaseous refrigerant is continuously liquefied along the flow direction of the refrigerant, and the liquid refrigerant becomes more and more, until it is completely converted into liquid refrigerant at the outlet. According to the principle of continuity of flow, the mass flow rate of the refrigerant is constant along the flow direction of the refrigerant, and the specific volume of the gaseous refrigerant is more than ten times that of its liquid state (taking R410A as an example, the specific volume of saturated vapor at 40°C is 0.01003m3 / kg, and the specific volume of saturated liquid is 0.00106m3 / kg. The gaseous specific volume is 9.5 times that of the liquid state, which means that the liquid density is 9.5 times the gaseous density). Therefore, the volume of the refrigerant is greatly reduced after liquefaction, and the refrigerant flow rate will be greatly reduced. According to the heat transfer coefficient equation of the turbulent flow of the refrigerant in the pipe, α=Bf*W 0.8 / D 0.2 It can be seen that the heat transfer coefficient is proportional to the 0.8 power of the refrigerant flow rate W. If the refrigerant flow rate at the outlet is low, the heat transfer coefficient is also low, and therefore the optimal heat transfer effect cannot be achieved.

[0004] Flow diversion is one solution to this problem. Existing heat exchangers typically employ diversion tubes or diverters to achieve this. However, these conventional diversion methods have numerous drawbacks, including complex systems, large structural footprints, and inconvenient assembly and application. Furthermore, the flow path of a diversion solution is fixed, preventing adaptive coupling changes based on load and actual usage.

[0005] Accordingly, this field requires a new technical solution to solve the above problems. Summary of the Invention

[0006] In order to solve at least one of the above-mentioned problems in the prior art, that is, to solve the problems of complex system and fixed process existing in the existing heat exchanger diversion means, the present application provides an air conditioner, which includes a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger. The compressor, the outdoor heat exchanger, the throttling device and the indoor heat exchanger are connected through a refrigerant pipeline. The outdoor heat exchanger includes multiple heat exchange pipe sections. An on-off valve group is also provided in the outdoor heat exchanger. The on-off valve group includes multiple on-off valves. The on-off valve group is configured to control the connection between the multiple heat exchange pipe sections.

[0007] Since the outdoor heat exchanger includes multiple heat exchange pipe sections and an on-off valve group is provided on the outdoor heat exchanger, the on-off valve group can be used to adjust the connection between the multiple heat exchange pipe sections, thereby realizing the adjustment of multiple diversion modes of the outdoor heat exchanger and the adaptation of diversified application scenarios without significantly increasing the complexity of the system.

[0008] In the preferred technical solution of the above air conditioner, the outdoor heat exchanger includes a first heat exchange pipe section, a second heat exchange pipe section and a third heat exchange pipe section which are connected in sequence.

[0009] In the preferred technical solution of the above-mentioned air conditioner, the outdoor heat exchanger also includes a first branch pipe and a second branch pipe, the first end of the first branch pipe is connected to the refrigerant pipeline between the compressor and the first heat exchange pipe section, the second end of the first branch pipe is connected to the refrigerant pipeline between the second heat exchange pipe section and the third heat exchange pipe section, the first end of the second branch pipe is connected to the refrigerant pipeline between the first heat exchange pipe section and the second heat exchange pipe section, the second end of the second branch pipe is connected to an end of the third heat exchange pipe section close to the second heat exchange pipe section, the on-off valve group includes a first on-off valve, a second on-off valve and a third on-off valve, the first on-off valve is arranged on the first branch pipe, the second on-off valve is arranged on the refrigerant pipeline between the second heat exchange pipe section and the third heat exchange pipe section and is located between the second end of the first branch pipe and the third heat exchange pipe section, and the third on-off valve is arranged on the second branch pipe.

[0010] In the preferred technical solution of the above-mentioned air conditioner, the outdoor heat exchanger also includes a third branch pipe, the first end of the third branch pipe is connected to the refrigerant pipeline between the first heat exchange pipe section and the second heat exchange pipe section, the second end of the third branch pipe is connected to the refrigerant pipeline between the third heat exchange pipe section and the throttling device, the first end of the second branch pipe is further connected to the third branch pipe, and the on-off valve group also includes a fourth on-off valve, which is arranged on the third branch pipe and located between the first end of the second branch pipe and the second end of the third branch pipe.

[0011] In a preferred technical solution of the above air conditioner, the compressor is a variable capacity compressor having two compression cylinders.

[0012] By setting up a variable capacity compressor, the variable capacity compressor can be used to switch between multiple working modes, making the air conditioner run more efficiently and stably.

[0013] In a second aspect of the present application, a refrigeration control method for an air conditioner is provided, wherein the air conditioner includes a compressor, an outdoor heat exchanger, a throttling device, and an indoor heat exchanger connected by a refrigerant pipeline, the outdoor heat exchanger includes a plurality of heat exchange pipe sections, and an on-off valve group is further provided in the outdoor heat exchanger, the on-off valve group includes a plurality of on-off valves, and the on-off valve group is configured to control the communication between the plurality of heat exchange pipe sections.

[0014] The refrigeration control method comprises:

[0015] Obtaining the outdoor ambient temperature and the operating frequency of the compressor;

[0016] determining an opening and closing mode of the on-off valve group based on the outdoor ambient temperature and the operating frequency;

[0017] Based on the opening and closing mode, the action of the on-off valve group is controlled.

[0018] The refrigeration control method of the present application can realize multiple diversion modes of the outdoor heat exchanger by determining the opening and closing mode of the on-off valve group based on the outdoor ambient temperature and operating frequency, and adjust the optimal diversion mode according to the actual load to achieve the best performance and energy efficiency.

[0019] In the preferred technical solution of the refrigeration control method of the above-mentioned air conditioner, the outdoor heat exchanger includes a first heat exchange pipe section, a second heat exchange pipe section and a third heat exchange pipe section connected in sequence, the outdoor heat exchanger also includes a first branch pipe and a second branch pipe, the first end of the first branch pipe is connected to the refrigerant pipeline between the compressor and the first heat exchange pipe section, the second end of the first branch pipe is connected to the refrigerant pipeline between the second heat exchange pipe section and the third heat exchange pipe section, the first end of the second branch pipe is connected to the refrigerant pipeline between the first heat exchange pipe section and the second heat exchange pipe section, the second end of the second branch pipe is connected to an end of the third heat exchange pipe section close to the second heat exchange pipe section, the on-off valve group includes a first on-off valve, a second on-off valve and a third on-off valve, the first on-off valve is arranged on the first branch pipe, the second on-off valve is arranged on the refrigerant pipeline between the second heat exchange pipe section and the third heat exchange pipe section and is located between the second end of the first branch pipe and the third heat exchange pipe section, and the third on-off valve is arranged on the second branch pipe.

[0020] In the preferred technical solution of the above-mentioned refrigeration control method for the air conditioner, the step of "determining the opening and closing mode of the on-off valve group based on the outdoor ambient temperature and the operating frequency" further includes:

[0021] If the outdoor ambient temperature is less than or equal to a first temperature threshold and the operating frequency is less than or equal to a first frequency threshold, determining that the on / off valve group has a first mode of opening and closing;

[0022] If the outdoor ambient temperature is less than or equal to the first temperature threshold and the operating frequency is greater than the first frequency threshold, determining that the opening and closing mode of the on-off valve group is the second mode;

[0023] The first mode is as follows: the first on-off valve is closed, the second on-off valve is open, and the third on-off valve is closed;

[0024] The second mode is: the first on-off valve is open, the second on-off valve is closed, and the third on-off valve is open.

[0025] In the preferred technical solution of the above-mentioned refrigeration control method for the air conditioner, the step of "determining the opening and closing mode of the on-off valve group based on the outdoor ambient temperature and the operating frequency" further includes:

[0026] If the outdoor ambient temperature is greater than the first temperature threshold and less than or equal to the second temperature threshold, and the operating frequency is less than or equal to the second frequency threshold, determining that the on / off valve group is in the first mode;

[0027] If the outdoor ambient temperature is greater than the first temperature threshold and less than or equal to the second temperature threshold, and the operating frequency is greater than the second frequency threshold, determining that the on / off valve group is in the second mode;

[0028] The second frequency threshold is greater than the first frequency threshold.

[0029] In the preferred technical solution of the above-mentioned refrigeration control method for the air conditioner, the step of "determining the opening and closing mode of the on-off valve group based on the outdoor ambient temperature and the operating frequency" further includes:

[0030] If the outdoor ambient temperature is greater than the second temperature threshold and the operating frequency is less than or equal to a third frequency threshold, determining that the on / off valve group is in the first mode;

[0031] If the outdoor ambient temperature is greater than the second temperature threshold and the operating frequency is greater than the third frequency threshold, determining that the on / off valve group is in the second mode;

[0032] The third frequency threshold is greater than the second frequency threshold. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present application is described below with reference to the accompanying drawings.

[0034] Figure 1 A system diagram of a first embodiment of the air conditioner of the present application;

[0035] Figure 2 A system diagram of a second embodiment of the air conditioner of the present application;

[0036] Figure 3 This is a flow chart of a first embodiment of the refrigeration control method for an air conditioner of the present application;

[0037] Figure 4 A logic diagram of a possible implementation of the refrigeration control method for an air conditioner of the present application;

[0038] Figure 5 This is a flow chart of a second embodiment of the cooling control method for an air conditioner of the present application.

[0039] Reference Signs List

[0040] 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; 4. Throttling device; 5. Indoor heat exchanger; 6. Refrigerant pipeline; 71. First branch pipe; 72. Second branch pipe; 73. Third branch pipe; 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

[0041] The preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application. For example, in the following embodiments, although the various steps are described in the aforementioned order, it will be understood by those skilled in the art that in order to achieve the effect of the present embodiment, the different steps do not have to be performed in such an order, and they can be performed simultaneously (in parallel) or in a reversed order, and these simple changes are all within the scope of protection of the present application.

[0042] It should be noted that, in the description of this application, the terms "upper", "lower", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely 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. Therefore, it cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", "fourth", "fifth", and "sixth" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, "multiple" refers to at least two.

[0043] Furthermore, it should be noted that, in the description of this application, 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; they can refer to direct connections, indirect connections through an intermediate medium, or 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.

[0044] First refer to Figure 1 , the air conditioner of this application is described.

[0045] like Figure 1 As shown, in order to solve the problems of complex system and fixed process in the existing heat exchanger diversion means, the air conditioner of the present application includes a compressor 1, a second four-way valve 2, an outdoor heat exchanger 3, a throttling device 4 and an indoor heat exchanger 5. Among them, the compressor 1, the second four-way valve 2, the outdoor heat exchanger 3, the first throttling device 4 and the indoor heat exchanger 5 are connected in sequence through the refrigerant pipeline 6 to form a refrigerant cycle. Preferably, the indoor heat exchanger 5 has an inner discharge pipeline and an outer discharge pipeline, which are arranged in parallel. The first throttling device 4 is an electronic expansion valve. The above-mentioned connection method and the working principle of the air conditioner are conventional technical means in this field, and will not be repeated in this application. In particular, the outdoor heat exchanger 3 of the present application includes a plurality of heat exchange pipe sections, and an on-off valve group is also provided in the outdoor heat exchanger 3. The on-off valve group includes a plurality of on-off valves, and the on-off valve group is configured to control the connection between the plurality of heat exchange pipe sections.

[0046] Since the outdoor heat exchanger 3 includes multiple heat exchange pipe sections and an on-off valve group is provided on the outdoor heat exchanger 3, the on-off valve group can be used to adjust the connection between the multiple heat exchange pipe sections, thereby realizing the adjustment of multiple diversion modes of the outdoor heat exchanger 3 and the adaptation of diversified application scenarios without significantly increasing the complexity of the system.

[0047] Refer to the following Figure 1 and Figure 2 , two preferred implementation modes of this application are introduced.

[0048] First refer to Figure 1 In a preferred embodiment, the outdoor heat exchanger 3 includes a first heat exchange pipe section 31, a second heat exchange pipe section 32, and a third heat exchange pipe section 33, which are 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 connected to the exhaust port 17 of the compressor 1 through the refrigerant pipeline 6, the other end of the first heat exchange pipe section 31 is connected to one end of the second heat exchange pipe section 32 through the refrigerant pipeline 6, the other end of the second heat exchange pipe section 32 is connected to one end of the third heat exchange pipe section 33 through the refrigerant pipeline 6, and the other end of the third heat exchange pipe section 33 is connected to the throttling device 4 through the refrigerant pipeline 6.

[0049] The outdoor heat exchanger 3 also includes a first branch pipe 71 and a second branch pipe 72. The first end of the first branch pipe 71 is connected to the refrigerant pipeline 6 between the compressor 1 and the first heat exchange pipe segment 31, and the second end of the first branch pipe 71 is connected to the refrigerant pipeline 6 between the second heat exchange pipe segment 32 and the third heat exchange pipe segment 33. The first end of the second branch pipe 72 is connected to the refrigerant pipeline 6 between the first heat exchange pipe segment 31 and the second heat exchange pipe segment 32, and the second end of the second branch pipe 72 is connected to the end of the third heat exchange pipe segment 33 closest to the second heat exchange pipe segment 32 (i.e., the end of the third heat exchange pipe segment 33 that is connected to the second heat exchange pipe segment 32).

[0050] The on-off valve assembly includes a first on-off valve 81, a second on-off valve 82, and a third on-off valve 83. The first on-off valve 81 is disposed on the first branch pipe 71, the second on-off valve 82 is disposed on the refrigerant pipeline 6 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 71 and the third heat exchange pipe section 33. The third on-off valve 83 is disposed on the second branch pipe 72.

[0051] Under the above-mentioned setting method, by controlling the opening and closing of the first on-off valve 81, the second on-off valve 82, and the third on-off valve 83, different connection 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 achieved, thereby achieving different diversion modes and heat exchange effects of the outdoor heat exchanger 3.

[0052] Next refer to Figure 2 In another preferred embodiment, based on the first embodiment, the outdoor heat exchanger 3 further includes a third branch pipe 73. The first end of the second branch pipe 72 is connected to the third branch pipe 73, the first end of the third branch pipe 73 is connected to the refrigerant pipeline 6 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 73 is connected to the refrigerant pipeline 6 between the third heat exchange pipe section 33 and the throttling device 4.

[0053] On this basis, the on-off valve assembly further includes a fourth on-off valve 84 . The fourth on-off valve 84 is disposed in the third branch pipe 73 and is located between the first end of the second branch pipe 72 and the second end of the third branch pipe 73 .

[0054] Under the above-mentioned setting method, 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, more connection 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 achieved, thereby achieving more diversion modes and heat exchange effects of the outdoor heat exchanger 3.

[0055] Further references Figure 2 In one embodiment, the compressor 1 is a variable capacity compressor 1 having two compression cylinders. Specifically, a first compression cylinder 11 and a second compression cylinder 12 are disposed within the variable capacity compressor 1. Four ports and an exhaust port 17 are provided on the housing of the compressor 1. 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 15 is connected to the exhaust port 17 through the interior of the housing.

[0056] The variable capacity compressor 1 is further equipped with a first four-way valve 9 having four ports a, b, c, and d. The first port a is connected to the fourth port 15, the second port b is connected to the second port 14, and the third port c is connected to the third port 15. A moving part is provided inside the first four-way valve 9. When the first four-way valve 9 is powered on or off, the moving part moves inside the first four-way valve 9 to connect or block the different ports.

[0057] 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 capacity 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 to the third port 15 indirectly through the fourth interface d of the first four-way valve 9. One end of the air supply pipeline is connected to the inlet of one of the gas-liquid separators 10. Figure 1 and Figure 2 What is shown in FIG. 1 is connected to the inlet of the gas-liquid separator 10 on the right.

[0058] Under the above configuration, the working modes of the variable capacity compressor 1 include a dual-cylinder mode and a dual-stage mode. Figure 2When the first four-way valve 9 is powered on, it is in two-stage mode. In this mode, the two compression cylinders of the variable capacity compressor 1 compress the refrigerant in sequence. Specifically, the first interface a and the fourth interface d of the first four-way valve 9 are separated by a moving part. After passing through one of the gas-liquid separators 10, the refrigerant discharged from the outdoor heat exchanger 3 enters the first compression cylinder 11 through the first port 13. After being compressed by the first compression cylinder 11, it is discharged from the second port 14. Then, after passing through the second interface b and the third interface c of the first four-way valve 9, it enters the second compression cylinder 12 through the third port 15. After secondary compression in the second compression cylinder 12, it is discharged from the exhaust port 17.

[0059] In contrast, when the first four-way valve 9 is de-energized, the system operates in dual-cylinder mode. In this mode, the two compression cylinders of the variable capacity compressor 1 independently compress the refrigerant. Specifically, a portion of the refrigerant discharged from the outdoor heat exchanger 3 passes through one of the gas-liquid separators 10 and enters the first compression cylinder 11 from the first port 13. After being compressed by the first compression cylinder 11, it is discharged from the second port 14. The refrigerant then passes through the second port b and the first port a of the first four-way valve 9, enters the housing, and is ultimately discharged from the exhaust port 17. Another portion of the refrigerant passes through the other gas-liquid separator 10, passes through the fourth port d and the third port c of the first four-way valve 9, and enters the second compression cylinder 12 from the third port 15. After being compressed by the second compression cylinder 12, it is discharged from the exhaust port 17.

[0060] By providing the variable capacity compressor 1, the variable capacity compressor 1 can be used to switch between multiple working modes, making the air conditioner run more efficiently and stably.

[0061] Those skilled in the art will understand that the above-mentioned setting of the air conditioner is only a preferred method, and those skilled in the art can adjust the structure of the above-mentioned air conditioner without deviating from the principles of this application, so that this application is applicable to more specific application scenarios. For example, although the above-mentioned air conditioner is introduced in combination with the second four-way valve 2, this embodiment is not static. In other embodiments, those skilled in the art can also selectively omit the second four-way valve 2 to make the air conditioner a single heating air conditioner. For another example, the specific form of the first throttling device 4 is not limited in this application, and the first throttling device 4 can also be a capillary tube or a thermal expansion valve. For another example, although the above-mentioned outdoor heat exchanger 3 is introduced in combination with the main heat exchange pipe section and the auxiliary heat exchange pipe section, the specific structural form of the outdoor heat exchanger 3 is not static. Those skilled in the art can replace it, such as including only the main heat exchange pipe section and omitting the auxiliary heat exchange pipe section. For example, the number and arrangement of the heat exchange pipe sections of the outdoor heat exchanger 3, the number and connection method of the branch pipes, the number and location of the on-off valves in the on-off valve group, and other aspects of the invention can all be adjusted by those skilled in the art so that the invention is applicable to more specific application scenarios. For example, those skilled in the art can increase or decrease the number, location, and connection method of the heat exchange pipe sections; or increase or decrease the number and connection relationship of the branch pipes; or increase or decrease the number and location of the on-off valves. In short, as long as the connection method of the heat exchange pipe sections can be adjusted by controlling the opening and closing of the on-off valves in the on-off valve group, such changes do not deviate from the principles of the invention. For example, the switching between the dual-cylinder mode and the bipolar mode of the variable displacement compressor 1 can be achieved without the first four-way valve 9, but by setting up multiple valve groups and 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 fixed. Under the premise of being able to switch between the dual-cylinder mode and the two-stage mode, those skilled in the art can adjust the structure of the variable displacement compressor 1, such as changing the number, location, and connection relationship of the ports. For another example, the gas-liquid separator 10 and the like are not necessarily provided, and those skilled in the art can select them according to specific needs.

[0062] Refer to the following Figure 1 and Figure 3 , the startup control method of the air conditioner of this application is introduced.

[0063] like Figure 1 and Figure 3 As shown, corresponding to the first preferred embodiment of the air conditioner, the cooling control method of the air conditioner of the present application includes:

[0064] S101: Acquire the outdoor ambient temperature and the compressor operating frequency. For example, the outdoor ambient temperature is acquired via a temperature sensor, and the operating frequency is acquired based on the air conditioner's operating information. Of course, the specific method for acquiring the outdoor ambient temperature and the compressor operating frequency is not fixed, and those skilled in the art may adjust this method, as long as both parameters can be successfully acquired.

[0065] S103: Determine the on / off mode of the on / off valve assembly based on the outdoor ambient temperature and the operating frequency. For example, after obtaining the outdoor ambient temperature and the operating frequency, determine the on / off mode of the on / off valve assembly based on the range of the two. Alternatively, determine the on / off mode of the on / off valve assembly based on a correlation between the two and the on / off valve assembly.

[0066] S105, based on the opening and closing mode, controlling the operation of the on-off valve group. For example, after determining the opening and closing mode of the on-off valve group, controlling each on-off valve in the on-off valve group to be switched on and off according to the opening and closing mode.

[0067] The refrigeration control method of the present application can realize multiple diversion modes of the outdoor heat exchanger by determining the opening and closing mode of the on-off valve group based on the outdoor ambient temperature and operating frequency, and adjust the optimal diversion mode according to the actual load to achieve the best performance and energy efficiency.

[0068] The preferred technical solution of this embodiment is introduced below.

[0069] In one embodiment, the on-off valve assembly of the present application has an opening and closing mode including a first mode and a second mode.

[0070] In the first mode, the first and third on-off valves are closed, and the second on-off valve is open. Thus, during operation, the refrigerant is discharged from the compressor and passes through the four-way valve. It then enters the first heat exchange segment from the upper portion of the first heat exchange segment, is discharged from the lower portion of the first heat exchange segment, and enters the second heat exchange segment from the lower portion of the second heat exchange segment. It then exits through the upper portion of the second heat exchange segment and enters the third heat exchange segment from the upper portion of the third heat exchange segment. Finally, it exits through the lower portion of the third heat exchange segment to the throttling device. In other words, the refrigerant passes through the first, second, and third heat exchange segments in sequence.

[0071] In the second mode, the first and third on-off valves are open, and the second on-off valve is closed. Thus, during operation, the refrigerant discharged from the compressor and passing through the four-way valve is split into two parts: one portion enters the first heat exchange segment through the upper portion of the first heat exchange segment and is discharged from the lower portion of the first heat exchange segment, while the other portion enters the second heat exchange segment through the upper portion of the second heat exchange segment and is discharged from the lower portion of the second heat exchange segment. The refrigerants discharged from the first and second heat exchange segments merge and then enter the third heat exchange segment through the upper portion of the third heat exchange segment, finally being discharged from the lower portion of the third heat exchange segment to the throttling device.

[0072] In one embodiment, the step of "determining the opening and closing mode of the on-off valve group based on the outdoor ambient temperature and the operating frequency" further includes: if the outdoor ambient temperature is less than or equal to the first temperature threshold and the operating frequency is less than or equal to the first frequency threshold, then determining that the opening and closing mode of the on-off valve group is the first mode; if the outdoor ambient temperature is less than or equal to the first temperature threshold and the operating frequency is greater than the first frequency threshold, then determining that the opening and closing mode of the on-off valve group is the second mode.

[0073] Specifically, the first temperature threshold is 22°C, and the first frequency threshold is 30Hz. When the outdoor ambient temperature is less than or equal to 22°C and the operating frequency is less than or equal to 30Hz, the load on the air conditioner is relatively small, and the on-off valve group adopts the first mode. In this mode, the outdoor heat exchanger has a long flow path, a large subcooling section, a fast refrigerant flow rate, a large heat exchange capacity, low air conditioning power, and high energy efficiency. When the outdoor ambient temperature is less than or equal to 22°C and the operating frequency is greater than 30Hz, the load on the air conditioner is relatively large, and the on-off valve group adopts the second mode. In this mode, the flow path is relatively short, the subcooling section is small, the flow rate is slow, the heat exchange is sufficient, the condensing temperature is low, and the power is low.

[0074] Of course, the above-mentioned first temperature threshold and first frequency threshold are not unique, and those skilled in the art can adjust them based on specific application scenarios.

[0075] In one embodiment, the step of "determining the opening and closing mode of the on-off valve group based on the outdoor ambient temperature and the operating frequency" further includes: if the outdoor ambient temperature is greater than a first temperature threshold and less than or equal to a second temperature threshold, and the operating frequency is less than or equal to the second frequency threshold, then determining that the opening and closing mode of the on-off valve group is the first mode; if the outdoor ambient temperature is greater than the first temperature threshold and less than or equal to the second temperature threshold, and the operating frequency is greater than the second frequency threshold, then determining that the opening and closing mode of the on-off valve group is the second mode; wherein the second frequency threshold is greater than the first frequency threshold.

[0076] Specifically, the second temperature threshold takes 29°C as an example, and the second frequency threshold takes 40Hz as an example. When the outdoor ambient temperature is greater than 22°C and less than or equal to 29°C, and the operating frequency is less than or equal to 40Hz, the load of the air conditioner is relatively small within the current temperature range, and the on-off valve group adopts the first mode. In this mode, the outdoor heat exchanger has a long flow, a large subcooling section, a fast refrigerant flow rate, a large heat exchange capacity, low air conditioning power, and high energy efficiency. When the outdoor ambient temperature is greater than 22°C and less than or equal to 29°C, and the operating frequency is greater than 40Hz, the load of the air conditioner is relatively large within the current temperature range, and the on-off valve group adopts the second mode. In this mode, the flow is relatively short, the subcooling section is small, the flow rate is slow, the heat exchange is sufficient, the condensing temperature is low, and the power is low.

[0077] Of course, the above-mentioned second temperature threshold and second frequency threshold are not unique, and those skilled in the art can adjust them based on specific application scenarios.

[0078] In one embodiment, the step of "determining the opening and closing mode of the on-off valve group based on the outdoor ambient temperature and the operating frequency" further includes: if the outdoor ambient temperature is greater than the second temperature threshold and the operating frequency is less than or equal to the third frequency threshold, then determining the opening and closing mode of the on-off valve group to be the first mode; if the outdoor ambient temperature is greater than the second temperature threshold and the operating frequency is greater than the third frequency threshold, then determining the opening and closing mode of the on-off valve group to be the second mode; wherein the third frequency threshold is greater than the second frequency threshold.

[0079] Specifically, the second temperature threshold is 29°C, and the third frequency threshold is 50Hz. When the outdoor ambient temperature is greater than 29°C and the operating frequency is less than or equal to 50Hz, the load of the air conditioner is relatively small within the current temperature range, and the on-off valve group adopts the first mode. In this mode, the outdoor heat exchanger has a long flow, a large subcooling section, a fast refrigerant flow rate, a large heat exchange capacity, low air conditioning power, and high energy efficiency. When the outdoor ambient temperature is greater than 29°C and the operating frequency is greater than 50Hz, the load of the air conditioner is relatively large within the current temperature range, and the on-off valve group adopts the second mode. In this mode, the flow is relatively short, the subcooling section is small, the flow rate is slow, the heat exchange is sufficient, the condensing temperature is low, and the power is low.

[0080] Of course, the third frequency threshold mentioned above is not unique, and those skilled in the art can adjust it based on specific application scenarios.

[0081] The following combination Figure 4 , a possible implementation process of this application is introduced.

[0082] like Figure 4 As shown, in one possible operation process:

[0083] S201, during the cooling operation, obtain the outdoor ambient temperature Tao and the compressor operating frequency f, and then execute S202.

[0084] S202, determine whether Tao ≤ 22 ° C is true. If so, execute S203; otherwise, if not, execute S206.

[0085] S203, further determine whether f≤30Hz is true. If true, execute S204; otherwise, execute S205.

[0086] S204, controlling the on-off valve group to switch to the first mode.

[0087] S205, controlling the on-off valve group to switch to the second mode.

[0088] S206, determine whether Tao>29 ° C is true. If so, execute S210; otherwise, if not, execute S207.

[0089] S207: Further determine whether f≤40Hz is true. If true, execute S208; otherwise, execute S209.

[0090] S208, controlling the on-off valve group to switch to the first mode.

[0091] S209, controlling the on-off valve group to switch to the second mode.

[0092] S210, further determine whether f≤50Hz is true. If true, execute S211; otherwise, execute S212.

[0093] S211, controlling the on-off valve group to switch to the first mode.

[0094] S212, controlling the on-off valve group to switch to the second mode.

[0095] It should be noted that although the detailed steps of the method of the present application are described in detail above, without departing from the basic principles of the present application, technical personnel in this field can combine, split and change the order of the above steps. The modified technical solution does not change the basic concept of the present application and therefore falls within the scope of protection of the present application.

[0096] Refer to the following Figure 5 , another preferred implementation of the refrigeration control method of the present application is introduced.

[0097] like Figure 5 As shown, corresponding to the second embodiment of the above-mentioned air conditioner, the refrigeration control method of the present application includes:

[0098] S301: Acquire the outdoor ambient temperature and the operating frequency of the variable capacity compressor. For example, the outdoor ambient temperature is acquired via a temperature sensor, and the operating frequency is acquired based on the air conditioner's operating information. Of course, the specific method for acquiring the outdoor ambient temperature and the compressor's operating frequency is not fixed, and those skilled in the art may adjust this method, as long as both parameters can be successfully acquired.

[0099] S303: Determine the operating mode of the variable capacity compressor and the on / off valve assembly opening and closing mode based on the outdoor ambient temperature and operating frequency. For example, after obtaining the outdoor ambient temperature and operating frequency, the operating mode of the variable capacity compressor and the on / off valve assembly opening and closing mode are determined based on the range within which the outdoor ambient temperature and operating frequency fall. Alternatively, the operating mode and opening and closing mode are determined based on a correlation between the outdoor ambient temperature and operating frequency and the variable capacity compressor and on / off valve assembly.

[0100] S305 controls the operation of the variable capacity compressor and the on-off valve assembly based on the operating mode and the on-off mode. For example, after determining the operating mode of the variable capacity compressor and the on-off mode of the on-off valve assembly, the variable capacity compressor is controlled to switch modes, and each on-off valve in the on-off valve assembly is controlled to open and close according to the on-off mode.

[0101] The refrigeration control method of the present application includes multiple heat exchange pipe sections through the outdoor heat exchanger, and an on-off valve group is set on the outdoor heat exchanger. The on-off valve group can be used to adjust the connection between the multiple heat exchange pipe sections, thereby realizing the adjustment of multiple diversion modes of the outdoor heat exchanger and the adaptation of diversified application scenarios without significantly increasing the complexity of the system. By determining the opening and closing mode of the on-off valve group based on the outdoor ambient temperature and the operating frequency, a variety of diversion modes of the outdoor heat exchanger can be realized, and the optimal diversion mode can be adjusted according to the actual load to achieve the best performance and energy efficiency. By setting a variable capacity compressor, the variable capacity compressor can be used to realize the switching of multiple working modes, making the operation of the air conditioner more efficient and stable.

[0102] The preferred technical solution of the second embodiment is introduced below.

[0103] In one embodiment, the opening and closing modes of the on-off valve group include a first mode and a second mode. The two modes have been introduced in the previous embodiment and will not be repeated here.

[0104] In one embodiment, the step of "determining the operating mode of the variable displacement compressor and the opening and closing mode of the on-off valve group based on the outdoor ambient temperature and the operating frequency" further includes: if the outdoor ambient temperature is less than or equal to the first temperature threshold and the operating frequency is less than or equal to the first frequency threshold, then determining that the operating mode of the variable displacement compressor is a two-stage mode, and the opening and closing mode of the on-off valve group is a first mode. If the outdoor ambient temperature is less than or equal to the first temperature threshold and the operating frequency is greater than the first frequency threshold and less than or equal to the second frequency threshold, then determining that the operating mode of the variable displacement compressor is a two-cylinder mode, and the opening and closing mode of the on-off valve group is a first mode. If the outdoor ambient temperature is less than or equal to the first temperature threshold and the operating frequency is greater than the second frequency threshold, then determining that the operating mode of the variable displacement compressor is a two-stage mode, and the opening and closing mode of the on-off valve group is a second mode.

[0105] Specifically, the first temperature threshold is 22°C, the first frequency threshold is 30Hz, and the second frequency threshold is 60Hz. When the outdoor ambient temperature is 22°C or less and the operating frequency is 30Hz or less, the air conditioner load is low, and the compressor operates in two-stage mode. In this mode, the variable-capacity compressor can achieve a higher compression ratio at a lower operating frequency, thereby meeting the condensing temperature requirement and ensuring the air conditioner's cooling effect and efficiency. The on-off valve assembly operates in the first mode. In this mode, the outdoor heat exchanger has a long flow path, a large subcooling section, a fast refrigerant flow rate, a high heat exchange rate, low air conditioning power, and high energy efficiency. When the outdoor ambient temperature is 22°C or less and the operating frequency is greater than 30Hz and less than 60Hz, the variable-capacity compressor operates in a two-cylinder mode, which has a lower frequency for the same exhaust volume. This reduces the high pressure of the air conditioning system and increases the low pressure, reducing the compressor's compression ratio. The on-off valve assembly operates in the first mode. In this mode, the outdoor temperature and compressor operating frequency are moderate, which, combined with the compressor's two-cylinder mode, results in high efficiency. When the outdoor ambient temperature is ≤22°C and the operating frequency is >60Hz, the air conditioner load is heavy due to the low temperature and high frequency. The variable-capacity compressor uses a two-stage mode, which allows it to achieve a higher compression ratio at a lower operating frequency. The on-off valve assembly uses the second mode, which shortens the flow path, minimizes the subcooling section, slows the flow rate, ensures efficient heat exchange, lowers the condensing temperature, and reduces power consumption. This combination reduces system pressure drop and improves heat exchange capacity.

[0106] Of course, the first temperature threshold, the first frequency threshold, and the second frequency threshold are not unique, and those skilled in the art can adjust them based on specific application scenarios.

[0107] In one embodiment, the step of "determining the working mode of the variable displacement compressor and the opening and closing mode of the on-off valve group based on the outdoor ambient temperature and the operating frequency" further includes: if the outdoor ambient temperature is greater than the first temperature threshold and less than or equal to the second temperature threshold, and the operating frequency is less than or equal to the third frequency threshold, then the working mode of the variable displacement compressor is determined to be a two-stage mode, and the opening and closing mode of the on-off valve group is the first mode. If the outdoor ambient temperature is greater than the first temperature threshold and less than or equal to the second temperature threshold, and the operating frequency is greater than the third frequency threshold and less than or equal to the fourth frequency threshold, then the working mode of the variable displacement compressor is determined to be a two-cylinder mode, and the opening and closing mode of the on-off valve group is the first mode. If the outdoor ambient temperature is greater than the first temperature threshold and less than or equal to the second temperature threshold, and the operating frequency is greater than the fourth frequency threshold, then the working mode of the variable displacement compressor is determined to be a two-cylinder mode, and the opening and closing mode of the on-off valve group is the first mode. Wherein, the third frequency threshold is greater than the first frequency threshold.

[0108] Specifically, the second temperature threshold is 29°C, the third frequency threshold is 40Hz, and the fourth frequency threshold is 70Hz. When the outdoor ambient temperature is greater than 22°C but less than or equal to 29°C, and the operating frequency is less than or equal to 40Hz, the air conditioner load is relatively low within the current temperature range. The variable-capacity compressor adopts two-stage mode. In this mode, the variable-capacity compressor can achieve a higher compression ratio at a lower operating frequency, thereby meeting the condensing temperature requirement and ensuring the air conditioner's cooling effect and efficiency. The on-off valve assembly adopts the first mode. In this mode, the outdoor heat exchanger has a long flow path, a large subcooling section, a fast refrigerant flow rate, a high heat exchange rate, low air conditioning power, and high energy efficiency. When the outdoor ambient temperature is greater than 22°C but less than or equal to 29°C, and the operating frequency is greater than 40Hz but less than 70Hz, the variable-capacity compressor adopts the two-cylinder mode. This lowers the frequency for the same exhaust volume, resulting in a lower high-pressure and higher low-pressure of the air conditioning system, and a lower compression ratio. The on-off valve assembly adopts the first mode. In this mode, the outdoor temperature and the compressor operating frequency are moderate, which, combined with the compressor's two-cylinder mode, results in high efficiency. When the outdoor ambient temperature is greater than 22°C and less than or equal to 29°C, and the operating frequency is greater than 70Hz, the air conditioner load is high within the current temperature range due to the low temperature and high frequency. The variable capacity compressor adopts a two-stage mode, which allows it to achieve a higher compression ratio at a lower operating frequency. The on-off valve assembly adopts the second mode, which shortens the flow path, reduces the subcooling section, slows the flow rate, ensures efficient heat exchange, lowers the condensing temperature, and reduces power consumption. This combination reduces system pressure drop and improves heat exchange capacity.

[0109] Of course, the second temperature threshold, the third frequency threshold, and the fourth frequency threshold are not unique, and those skilled in the art may adjust them based on specific application scenarios.

[0110] In one embodiment, the step of "determining the working mode of the variable displacement compressor and the opening and closing mode of the on-off valve group based on the outdoor ambient temperature and the operating frequency" further includes: if the outdoor ambient temperature is greater than the second temperature threshold and the operating frequency is less than or equal to the fifth frequency threshold, then the working mode of the variable displacement compressor is determined to be a two-stage mode, and the opening and closing mode of the on-off valve group is the first mode. If the outdoor ambient temperature is greater than the second temperature threshold and the operating frequency is greater than the fifth frequency threshold and is less than or equal to the sixth frequency threshold, then the working mode of the variable displacement compressor is determined to be a two-stage mode, and the opening and closing mode of the on-off valve group is the second mode. If the outdoor ambient temperature is greater than the second temperature threshold and the operating frequency is greater than the sixth frequency threshold, then the working mode of the variable displacement compressor is determined to be a two-cylinder mode, and the opening and closing mode of the on-off valve group is the second mode. Wherein, the fifth frequency threshold is greater than the third frequency threshold.

[0111] Specifically, the second temperature threshold is 29°C, the fifth frequency threshold is 50Hz, and the sixth frequency threshold is 80Hz. When the outdoor ambient temperature is greater than 29°C and the operating frequency is ≤50Hz, the air conditioner load is relatively low within the current temperature range. The variable-capacity compressor adopts two-stage mode. In this mode, the variable-capacity compressor can achieve a higher compression ratio at a lower operating frequency, thereby meeting the condensing temperature requirement and ensuring the air conditioner's cooling effect and efficiency. The on-off valve assembly adopts the first mode. In this mode, the outdoor heat exchanger has a long flow path, a large subcooling section, a fast refrigerant flow rate, a high heat exchange capacity, low air conditioning power, and high energy efficiency. When the outdoor ambient temperature is greater than 29°C and the operating frequency is greater than 50Hz and less than 80Hz, the variable-capacity compressor adopts two-stage mode, achieving a higher compression ratio at a lower operating frequency. The on-off valve assembly adopts the second mode. In this mode, the flow path is relatively short, the subcooling section is small, the flow rate is slow, heat exchange is sufficient, the condensing temperature is low, and power is low. Combining these two modes reduces pipeline pressure drop and improves heat exchange capacity. When the outdoor ambient temperature is greater than 29°C and the operating frequency is greater than 80Hz, the air conditioner load is high within the current temperature range. High temperatures, high frequencies, large pressure ratios, and significant leakage are common. In this case, the variable displacement compressor selects the dual-cylinder mode, which lowers the frequency at the same exhaust volume. This lowers the high pressure and high low pressure of the air conditioning system, reduces the compressor's compression ratio, and reduces leakage. The on-off valve group uses the second mode, which shortens the flow path, minimizes the subcooling section, slows the flow rate, ensures sufficient heat exchange, and reduces the condensing temperature and power.

[0112] Of course, the fifth frequency threshold and the sixth frequency threshold are not unique, and those skilled in the art may adjust them based on specific application scenarios.

[0113] Those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of this application and to form different embodiments. For example, in the claims of this application, any of the claimed embodiments may be used in any combination.

[0114] Thus far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present application.

Claims

1. An air conditioner, characterized in that: The air conditioner includes a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger, wherein the compressor, the outdoor heat exchanger, the throttling device and the indoor heat exchanger are connected via a refrigerant pipeline, the outdoor heat exchanger includes a plurality of heat exchange pipe sections, and an on-off valve group is further provided in the outdoor heat exchanger, the on-off valve group includes a plurality of on-off valves, and the on-off valve group is configured to control the communication between the plurality of heat exchange pipe sections; 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; The outdoor heat exchanger further includes a first branch pipe and a second branch pipe, the first end of the first branch pipe being connected to the refrigerant pipeline between the compressor and the first heat exchange pipe section, the second end of the first branch pipe being connected to the refrigerant pipeline between the second heat exchange pipe section and the third heat exchange pipe section, the first end of the second branch pipe being connected to the refrigerant pipeline between the first heat exchange pipe section and the second heat exchange pipe section, the second end of the second branch pipe being connected to an end of the third heat exchange pipe section close to the second heat exchange pipe section, the on-off valve group including a first on-off valve, a second on-off valve and a third on-off valve, the first on-off valve being arranged on the first branch pipe, the second on-off valve being arranged on the refrigerant pipeline between the second heat exchange pipe section and the third heat exchange pipe section and being located between the second end of the first branch pipe and the third heat exchange pipe section, and the third on-off valve being arranged on the second branch pipe; The on-off valve group is configured to control the communication between the plurality of heat exchange pipe sections in the following manner: Obtaining the outdoor ambient temperature and the operating frequency of the compressor; If the outdoor ambient temperature is less than or equal to a first temperature threshold and the operating frequency is less than or equal to a first frequency threshold, determining that the on / off valve group has a first mode of opening and closing; If the outdoor ambient temperature is less than or equal to the first temperature threshold and the operating frequency is greater than the first frequency threshold, determining that the opening and closing mode of the on-off valve group is the second mode; The first mode is as follows: the first on-off valve is closed, the second on-off valve is open, and the third on-off valve is closed; The second mode is: the first on-off valve is open, the second on-off valve is closed, and the third on-off valve is open.

2. The air conditioner according to claim 1, characterized in that The outdoor heat exchanger also includes a third branch pipe, a first end of the third branch pipe is connected to the refrigerant pipeline between the first heat exchange pipe section and the second heat exchange pipe section, a second end of the third branch pipe is connected to the refrigerant pipeline between the third heat exchange pipe section and the throttling device, and the first end of the second branch pipe is further connected to the third branch pipe. The on-off valve group also includes a fourth on-off valve, which is arranged on the third branch pipe and located between the first end of the second branch pipe and the second end of the third branch pipe.

3. The air conditioner according to claim 1, characterized in that The compressor is a variable capacity compressor having two compression cylinders.

4. A cooling control method for an air conditioner, characterized in that: The air conditioner includes a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger connected by a refrigerant pipeline. The outdoor heat exchanger includes a plurality of heat exchange pipe sections. An on-off valve group is also provided in the outdoor heat exchanger. The on-off valve group includes a plurality of on-off valves. The on-off valve group is configured to control the communication between the plurality of heat exchange pipe sections. The refrigeration control method comprises: Obtaining the outdoor ambient temperature and the operating frequency of the compressor; determining an opening and closing mode of the on-off valve group based on the outdoor ambient temperature and the operating frequency; Based on the opening and closing mode, controlling the action of the on-off valve group; The outdoor heat exchanger includes a first heat exchange pipe section, a second heat exchange pipe section and a third heat exchange pipe section connected in sequence, the outdoor heat exchanger also includes a first branch pipe and a second branch pipe, the first end of the first branch pipe is connected to the refrigerant pipe between the compressor and the first heat exchange pipe section, the second end of the first branch pipe is connected to the refrigerant pipe between the second heat exchange pipe section and the third heat exchange pipe section, the first end of the second branch pipe is connected to the refrigerant pipe between the first heat exchange pipe section and the second heat exchange pipe section, the second end of the second branch pipe is connected to an end of the third heat exchange pipe section close to the second heat exchange pipe section, the on-off valve group includes a first on-off valve, a second on-off valve and a third on-off valve, the first on-off valve is arranged on the first branch pipe, the second on-off valve is arranged on the refrigerant pipe between the second heat exchange pipe section and the third heat exchange pipe section and is located between the second end of the first branch pipe and the third heat exchange pipe section, and the third on-off valve is arranged on the second branch pipe; The step of “determining the opening and closing mode of the on-off valve group based on the outdoor ambient temperature and the operating frequency” further includes: If the outdoor ambient temperature is less than or equal to a first temperature threshold and the operating frequency is less than or equal to a first frequency threshold, determining that the on / off valve group has a first mode of opening and closing; If the outdoor ambient temperature is less than or equal to the first temperature threshold and the operating frequency is greater than the first frequency threshold, determining that the opening and closing mode of the on-off valve group is the second mode; The first mode is as follows: the first on-off valve is closed, the second on-off valve is open, and the third on-off valve is closed; The second mode is: the first on-off valve is open, the second on-off valve is closed, and the third on-off valve is open.

5. The cooling control method of the air conditioner according to claim 4, characterized in that: The step of “determining the opening and closing mode of the on-off valve group based on the outdoor ambient temperature and the operating frequency” further includes: If the outdoor ambient temperature is greater than the first temperature threshold and less than or equal to the second temperature threshold, and the operating frequency is less than or equal to the second frequency threshold, determining that the on / off valve group is in the first mode; If the outdoor ambient temperature is greater than the first temperature threshold and less than or equal to the second temperature threshold, and the operating frequency is greater than the second frequency threshold, determining that the on / off valve group is in the second mode; The second frequency threshold is greater than the first frequency threshold.

6. The cooling control method of the air conditioner according to claim 5, characterized in that: The step of “determining the opening and closing mode of the on-off valve group based on the outdoor ambient temperature and the operating frequency” further includes: If the outdoor ambient temperature is greater than the second temperature threshold and the operating frequency is less than or equal to a third frequency threshold, determining that the on / off valve group is in the first mode; If the outdoor ambient temperature is greater than the second temperature threshold and the operating frequency is greater than the third frequency threshold, determining that the on / off valve group is in the second mode; The third frequency threshold is greater than the second frequency threshold.

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