Adjustable heat exchange system and control method thereof, and air conditioner

Abstract

The application discloses an adjustable heat exchange system, a control method thereof and an air conditioner. The adjustable heat exchange system comprises a compressor, a throttling device, at least two heat exchangers and at least two adjusting devices. The compressor is connected with one heat exchanger through one adjusting device, and the throttling device is connected with another heat exchanger through another adjusting device. The heat exchanger comprises a heat exchange pipe, and the heat exchange pipe is connected with the adjusting device. By arranging the adjusting device in the system, the actual heat exchange area of the heat exchanger is adjusted by opening or closing the adjusting device, and the refrigerant which does not need to participate in the circulation is stored in part of the heat exchanger, so that the comprehensive energy efficiency of the heat exchange system is improved.

Description

Technical Field

[0001] This invention relates to the field of heat exchange system technology, and in particular to an adjustable heat exchange system and its control method, as well as an air conditioner. Background Technology

[0002] With continuous technological advancements, the requirements for heat exchange systems in various applications are becoming increasingly stringent, and the operating range of these systems is expanding. Under different operating conditions, the system's load varies, necessitating different effective heat exchange areas and optimal refrigerant charges. In existing heat exchange systems, the heat exchange area and refrigerant charge are constant. During low-load operation, this constant heat exchange area and refrigerant charge result in some waste, with the actual heat exchange volume being far less than the system's rated heat exchange volume. Furthermore, the accumulation of large amounts of refrigerant in the evaporator and condenser can lead to liquid carryover in the compressor suction, causing compressor damage. Ineffective heat exchange area and refrigerant not participating in the cycle reduce the system's overall energy efficiency. To achieve the optimal ratio of effective heat exchange area and operating refrigerant charge under different operating loads, an adjustable heat exchange system needs to be designed. Summary of the Invention

[0003] This invention provides an adjustable heat exchange system and its control method, as well as an air conditioner. By setting an adjustment device in the system, the actual heat exchange area of ​​the heat exchanger can be adjusted by opening or closing the adjustment device, and the refrigerant that does not need to participate in the circulation can be stored in part of the heat exchanger, thereby improving the overall energy efficiency of the system.

[0004] To address the aforementioned problems, according to one aspect of this application, an embodiment of the present invention provides an adjustable heat exchange system, comprising: a compressor, a throttling device, at least two heat exchangers, and at least two regulating devices; the compressor is connected to one heat exchanger via one regulating device, and the throttling device is connected to another heat exchanger via another regulating device; the heat exchanger includes heat exchange tubes, and the heat exchange tubes are connected to the regulating devices.

[0005] In some implementations, the system is provided with a first heat exchanger and a second heat exchanger, the first heat exchanger and / or the second heat exchanger being provided with at least two heat exchange tubes, the two ends of which are connected to different regulating devices.

[0006] In some implementations, an adjustment device is provided between the heat exchange tubes.

[0007] In some implementations, at least a portion of the heat exchangers are connected in parallel to the regulating device.

[0008] In some implementations, the heat exchanger is provided with at least two heat exchange tubes.

[0009] In some implementations, an adjustment device is provided between the heat exchange tubes.

[0010] In some implementations, an adjustment device is provided between at least two heat exchangers.

[0011] In some implementations, the heat exchanger tubes have different heat exchange areas.

[0012] In some implementations, the regulating device is a single-channel control element and / or a multi-channel control element.

[0013] In some implementations, the regulating device is a solenoid valve and / or a multi-line adjustable valve.

[0014] According to another aspect of this application, embodiments of the present invention provide a control method for an adjustable heat exchange system, applied to the aforementioned adjustable heat exchange system, comprising:

[0015] Step 1: Obtain the ambient temperature of at least two heat exchangers, and control the adjustment device to open or close according to the ambient temperature, so that each heat exchange tube is either connected or disconnected.

[0016] Step 2: Obtain the mid-temperature and external medium temperature of at least two heat exchangers. Based on the difference between the mid-temperature and external medium temperature, control the regulating device to open or close, so that each heat exchange tube is either connected or disconnected.

[0017] Step 3: Obtain the compressor's suction pressure, discharge pressure, and suction temperature. Based on the suction pressure, discharge pressure, and the difference between the suction temperature and the intermediate temperature, control the regulating device to open or close, so that each heat exchange tube is either connected or disconnected.

[0018] In some embodiments, a first heat exchanger and a second heat exchanger are included. The first heat exchanger includes L heat exchange tubes, and the second heat exchanger includes Q heat exchange tubes. Step one includes: obtaining the ambient temperature of the first heat exchanger, and according to the ambient temperature, controlling the regulating device connected to the L heat exchange tubes to open M heat exchange tubes of the first heat exchanger, and controlling the regulating device connected to the Q heat exchange tubes of the second heat exchanger to open N heat exchange tubes of the second heat exchanger, wherein M is less than or equal to L, and N is less than or equal to Q.

[0019] In some implementations, L is 4 and Q is 4.

[0020] In some embodiments, controlling the regulating device connected to L heat exchange tubes to open M heat exchange tubes of the first heat exchanger, and controlling the regulating device connected to Q heat exchange tubes of the second heat exchanger to open N heat exchange tubes of the second heat exchanger, based on the obtained ambient temperature of the first heat exchanger, includes:

[0021] When the ambient temperature is in the first outdoor unit temperature range, control to open one heat exchange tube of the first heat exchanger; and when the ambient temperature is in the first indoor unit temperature range, control to open one heat exchange tube of the second heat exchanger.

[0022] Alternatively, when the ambient temperature is in the second outdoor unit temperature range, control the opening of two heat exchange tubes of the first heat exchanger, and when the ambient temperature is in the second indoor unit temperature range, control the opening of two heat exchange tubes of the second heat exchanger.

[0023] Alternatively, when the ambient temperature is within the third outdoor unit temperature range, control the opening of three heat exchange tubes of the first heat exchanger, and when the ambient temperature is within the third indoor unit temperature range, control the opening of three heat exchange tubes of the second heat exchanger.

[0024] Alternatively, when the ambient temperature is within the fourth outdoor unit temperature range, control the opening of the four heat exchange tubes of the first heat exchanger, and when the ambient temperature is within the fourth indoor unit temperature range, control the opening of the four heat exchange tubes of the second heat exchanger.

[0025] In some embodiments, step two includes: when the difference between the temperature at the middle of the first heat exchanger and the temperature of the external medium of the first heat exchanger is less than a first set temperature, and the difference between the temperature of the external medium of the second heat exchanger and the temperature at the middle of the second heat exchanger is less than a second set temperature, and the difference between the compressor suction temperature and the temperature at the middle of the second heat exchanger is greater than a third set temperature, the control adjustment device is opened to increase the number of conductive heat exchange tubes.

[0026] According to another aspect of this application, an embodiment of the present invention provides an air conditioner that includes the adjustable heat exchange system described above.

[0027] This application incorporates a regulating device within the system, connected to the heat exchanger tubes. By opening or closing this device, appropriate heat exchanger tubes are selected to participate in system operation under different operating loads, adjusting the heat exchanger's heat exchange area. Simultaneously, refrigerant not required for circulation is stored in these non-operating heat exchanger tubes. This rational adjustment of the effective heat exchange area reduces ineffective refrigerant participation, optimizing the match between heat exchange area and refrigerant charge to the required heat exchange capacity, thereby improving the overall energy efficiency of the heat exchange system. Excess refrigerant stored in the heat exchanger tubes does not participate in system circulation, increasing the refrigerant dryness at compressor intake and preventing liquid carryover to the compressor, thus preventing compressor damage. Furthermore, switching between different heat exchanger tubes during system operation also enables system-on-demand defrosting.

[0028] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of an adjustable heat exchange system according to an embodiment of the present invention;

[0030] Figure 2This is a schematic diagram of an adjustable heat exchange system according to another embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of an adjustable heat exchange system according to another embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of an adjustable heat exchange system according to another embodiment of the present invention;

[0033] Figure 5 This is a logic diagram of a control method according to an embodiment of the present invention;

[0034] Figure 6 This is a logic diagram of the flow path selection for the first heat exchanger according to an embodiment of the present invention;

[0035] Figure 7 This is a logic diagram of the flow path selection for the second heat exchanger according to an embodiment of the present invention;

[0036] Figure 8 This is a logic diagram of the flow path control of the first heat exchanger according to an embodiment of the present invention;

[0037] Figure 9 This is a logic diagram of the flow path control of the second heat exchanger according to an embodiment of the present invention;

[0038] Figure 10 This is a logic diagram of the flow path control of the first heat exchanger according to another embodiment of the present invention;

[0039] Figure 11 This is a logic diagram of the flow path control of the second heat exchanger according to another embodiment of the present invention.

[0040] in:

[0041] 1. Compressor; 11. Discharge port; 12. Inlet port; 2. Throttling device; 21. Liquid inlet; 22. Liquid outlet; 3. Heat exchanger; 31. First heat exchanger; 311. First heat exchange tube; 312. Second heat exchange tube; 313. Third heat exchange tube; 314. Fourth heat exchange tube; 32. Second heat exchanger; 321. Fifth heat exchange tube; 322. Sixth heat exchange tube; 323. Seventh heat exchange tube; 324. Eighth heat exchange tube; 33. Third heat exchanger; 34. Fourth heat exchanger; 35. Fifth heat exchanger; 36. Sixth heat exchanger; 37. Seventh heat exchanger; 38. Eighth heat exchanger; 4. Regulating device; 41. 42. First solenoid valve; 43. Second solenoid valve; 44. Third solenoid valve; 45. Fourth solenoid valve; 46. Fifth solenoid valve; 47. Sixth solenoid valve; 48. Seventh solenoid valve; 49. Eighth solenoid valve; 40. Ninth solenoid valve; 410. Tenth solenoid valve; 411. Eleventh solenoid valve; 412. Twelfth solenoid valve; 413. Thirteenth solenoid valve; 414. Fourteenth solenoid valve; 415. Fifteenth solenoid valve; 416. Sixteenth solenoid valve; 417. First multi-pipe adjustable valve; 418. Second multi-pipe adjustable valve; 419. Third multi-pipe adjustable valve; 420. Fourth multi-pipe adjustable valve. Detailed Implementation

[0042] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the specific embodiments, structures, features, and effects according to the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0043] In the description of this invention, it should be clearly stated that the terms "vertical", "lateral", "longitudinal", "front", "back", "left", "right", "up", "down", "horizontal", etc., which indicate orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this invention, and do not mean that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this invention.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] This embodiment provides an adjustable heat exchange system, such as Figures 1 to 4 As shown, the system includes: a compressor 1, a throttling device 2, at least two heat exchangers 3, and at least two regulating devices 4. The compressor 1 is connected to at least two heat exchangers 3 via the regulating devices 4, and the throttling device 2 is also connected to at least two heat exchangers 3 via the regulating devices 4. The regulating devices 4 can be opened or closed. Each heat exchanger 3 includes heat exchange tubes for the flow or storage of refrigerant, and these tubes are connected to the regulating devices 4. One end of the regulating device 4 is connected to the main flow path of the heat exchange system, either to the compressor 1 or to the throttling device 2. The other end of the regulating device 4 is connected to the heat exchange tubes of the heat exchanger 3. The regulating device 4 can be opened or closed. When the regulating device 4 is open, refrigerant can flow through it, allowing it to enter or exit the heat exchanger 3. When the regulating device 4 is closed, it blocks the flow of refrigerant, preventing it from entering or exiting the heat exchanger 3. By simultaneously closing the regulating devices 4 connected to both ends of the heat exchanger 3, the refrigerant can be stored within the heat exchanger 3, preventing it from leaving the heat exchanger 3. The regulating device 4 can be a single-channel control element, such as a solenoid valve. Each single-channel control element can control the opening or closing of one end of a heat exchange tube in the heat exchanger 3. When multiple single-channel control elements are connected to a heat exchanger 3, they can control the opening or closing of both ends of each heat exchange tube in the heat exchanger 3, allowing refrigerant to flow into or out of the heat exchange tubes of the heat exchanger 3, or to store refrigerant in one or all of the heat exchange tubes of the heat exchanger 3. The regulating device 4 can also be a multi-channel control element, such as a multi-pipe adjustable valve. Like single-channel control elements, multi-channel control elements can open or close, controlling the passage of refrigerant through or blocking the passage of refrigerant through the heat exchange tubes. Unlike single-channel control elements, a multi-channel control element can simultaneously control multiple heat exchange tubes in a heat exchanger 3, allowing refrigerant to flow into or out of one or more heat exchange tubes. The regulating device 4 can also be any other device used to open or close the heat exchange flow path of the heat exchange system. Throttling device 2 is a pressure regulating device in the heat exchange system, which can reduce the pressure of high-pressure refrigerant so that the refrigerant has a suitable pressure when it enters the evaporator.

[0046] In this embodiment, the regulating device 4 can be turned on or off as needed to control the flow of refrigerant into or out of the heat exchange tubes of certain heat exchangers 3, or the refrigerant can be stored in the heat exchange tubes of certain heat exchangers 3. This configuration allows selection of certain heat exchange tubes from certain heat exchangers 3 to participate in the actual operation of the heat exchange system. When fewer heat exchange tubes are needed for actual operation, a suitable number of heat exchange tubes are closed, and the required amount of refrigerant is stored in these closed tubes. This allows adjustment of the heat exchange area and the amount of refrigerant used, achieving a reasonable match between the heat exchange area and refrigerant usage to the heat exchange system's requirements. This avoids reduced overall system energy efficiency and damage to system components caused by excessive heat exchange area and refrigerant participation. Furthermore, when frost forms on certain heat exchangers 3, the regulating device 4 can be used to change the heat exchangers 3 or certain heat exchange tubes involved in actual operation, preventing the frosted parts from participating in system operation. Natural defrosting allows the entire heat exchange system to defrost without shutting down.

[0047] like Figure 1 As shown in the illustration, in a specific embodiment of the adjustable heat exchange system, the regulating device 4 is configured with a single-channel control element solenoid valve, namely the first solenoid valve 41 to the sixteenth solenoid valve 416; the heat exchanger 3 is configured as a first heat exchanger 31 and a second heat exchanger 32, the first heat exchanger 31 including the first heat exchange tube 311 to the fourth heat exchange tube 314, and the second heat exchanger 32 including the fifth heat exchange tube 321 to the eighth heat exchange tube 324. The exhaust port 11 of the compressor 1 is connected to one end of the first heat exchange tube 311 to the fourth heat exchange tube 314 of the first heat exchanger 31 through the first solenoid valve 41 to the fourth solenoid valve 44, respectively, and the other end of the first heat exchange tube 311 to the fourth heat exchange tube 314 is connected to the inlet end 21 of the throttling device 2 through the fifth solenoid valve 45 to the eighth solenoid valve 48, respectively. The liquid outlet 22 of the throttling device 2 is connected to one end of the fifth heat exchange tube 321 to the eighth heat exchange tube 324 of the second heat exchanger 32 through the ninth solenoid valve 49 to the twelfth solenoid valve 412 respectively. The other end of the fifth heat exchange tube 321 to the eighth heat exchange tube 324 is connected to the suction port 12 of the compressor 1 through the thirteenth solenoid valve 413 to the sixteenth solenoid valve 416 respectively.

[0048] Specifically, when the required heat exchange is large, the system operates under heavy load, with all or most of the solenoid valves open. At this time, all or most of the heat exchange tubes and refrigerant participate in the system operation. When the required heat exchange decreases, the system transitions from heavy load operation to medium load operation, correspondingly reducing the required heat exchange area and refrigerant quantity. In this case, some heat exchange tubes can be closed, and some refrigerant that does not need to participate in the operation can be stored in these tubes. This reduces the amount of ineffective refrigerant occupying the system's heat exchange area, avoids increased compressor power consumption, and prevents excessive ineffective refrigerant from causing insufficient heat absorption, resulting in liquid carryover in the compressor's intake and potential compressor damage. For example, closing the first solenoid valve 41, the eighth solenoid valve 48, the twelfth solenoid valve 412, and the sixteenth solenoid valve 416 can prevent refrigerant from flowing into and out of the fourth heat exchange tube 314 and the eighth heat exchange tube 324, allowing a suitable amount of refrigerant to be stored within them. Since the fourth heat exchange tube 314 and the eighth heat exchange tube 324 no longer participate in system operation, this reduces the system's ineffective heat exchange area and excess refrigerant. When the required heat exchange volume decreases further, the system transitions from medium-load operation to light-load operation. The required heat exchange area and refrigerant quantity decrease further. At this point, some heat exchange tubes can be closed, and more refrigerant not needed for operation can be stored in the closed tubes. For example, the second solenoid valve 42, the seventh solenoid valve 47, the eleventh solenoid valve 411, and the fifteenth solenoid valve 415 can be closed further, preventing refrigerant from flowing into and out of the third heat exchange tube 313 and the seventh heat exchange tube 323. This allows a suitable amount of refrigerant to be stored in the third and seventh heat exchange tubes, which are no longer involved in system operation. Based on this principle, when the required heat exchange volume decreases further, more solenoid valves can be closed to shut down more heat exchange tubes, preventing the closed tubes and corresponding refrigerant from participating in system operation, thus improving overall system energy efficiency and preventing damage to system components. Conversely, when the required heat exchange is small, the system operates under light load, with most solenoid valves closed. At this time, most of the heat exchange tubes and the refrigerant stored in them do not participate in system operation. When the required heat exchange increases, the system transitions from light load operation to medium load operation, requiring a corresponding increase in heat exchange area and refrigerant quantity. In this case, some heat exchange tubes can be opened, and the refrigerant stored in them can be released into the system to participate in system operation, thereby increasing the effective heat exchange area to accommodate the increased heat exchange demand. For example, the first solenoid valve 41, the eighth solenoid valve 48, the twelfth solenoid valve 412, and the sixteenth solenoid valve 416 can be opened to allow refrigerant to flow into and out of the fourth heat exchange tube 314 and the eighth heat exchange tube 324 to participate in system operation, and the refrigerant stored in these heat exchange tubes can be released into the system to participate in heat exchange.When the required heat exchange volume increases further, the system transitions from medium-load operation to heavy-load operation, requiring an increased heat exchange area and refrigerant quantity. At this point, some heat exchange tubes can be opened, releasing more refrigerant into the system. For example, the second solenoid valve 42, the seventh solenoid valve 47, the eleventh solenoid valve 411, and the fifteenth solenoid valve 415 can be opened to allow refrigerant to flow into and out of the third heat exchange tube 313 and the seventh heat exchange tube 323, participating in system operation. This allows the refrigerant stored in these heat exchange tubes to be released into the system and participate in heat exchange. Following this principle, when the required heat exchange volume increases further, more solenoid valves can be opened to open more heat exchange tubes, allowing more heat exchange tubes and stored refrigerant to participate in system operation, improving heat exchange capacity and meeting heat exchange demands. The above examples are merely illustrations of several ways to adjust the effective heat exchange area and refrigerant quantity in this embodiment. This application also includes other methods of adjusting the effective heat exchange area and refrigerant quantity by controlling the opening or closing of the regulating device.

[0049] like Figure 2 As shown in the illustration, in a specific embodiment of the adjustable heat exchange system, the regulating device 4 is configured as a multi-channel adjustable valve with multiple control elements, namely a first multi-channel adjustable valve 417 to a fourth multi-channel adjustable valve 420; the heat exchanger 3 is configured as a first heat exchanger 31 and a second heat exchanger 32, the first heat exchanger 31 including a first heat exchange tube 311 to a fourth heat exchange tube 314, and the second heat exchanger 32 including a fifth heat exchange tube 321 to an eighth heat exchange tube 324. The discharge port 11 of the compressor 1 is connected to one end of the first heat exchange tube 311 to the fourth heat exchange tube 314 of the first heat exchanger 31 through the first multi-channel adjustable valve 417, and the other end of the first heat exchange tube 311 to the fourth heat exchange tube 314 is connected to the inlet 21 of the throttling device 2 through the second multi-channel adjustable valve 418. The liquid outlet 22 of the throttling device 2 is connected to one end of the fifth heat exchange tube 321 to the eighth heat exchange tube 324 of the second heat exchanger 32 through the third multi-pipe adjustable valve 419. The other end of the fifth heat exchange tube 321 to the eighth heat exchange tube 324 is connected to the suction port 12 of the compressor 1 through the fourth multi-pipe adjustable valve 420.

[0050] Specifically, when the required heat exchange is large, the system operates under heavy load, and all or most of the multi-pipe adjustable valves are open. At this time, all or most of the heat exchange tubes and refrigerant participate in the system operation. When the required heat exchange decreases, the system switches from heavy load operation to medium load operation, and the required heat exchange area and refrigerant quantity decrease accordingly. At this time, some heat exchange tubes can be closed, and some refrigerant that does not need to participate in the operation can be stored in these heat exchange tubes, improving the overall energy efficiency of the system. For example, the first multi-pipe adjustable valve 417, the second multi-pipe adjustable valve 418, the third multi-pipe adjustable valve 419, and the fourth multi-pipe adjustable valve 420 can be controlled to prevent refrigerant from flowing into and out of the fourth heat exchange tube 314 and the eighth heat exchange tube 324. This allows an appropriate amount of refrigerant to be stored in the fourth heat exchange tube 314 and the eighth heat exchange tube 324, preventing them from participating in the system operation and reducing the ineffective heat exchange area and excess refrigerant. When the required heat exchange volume decreases further, the system transitions from medium-load operation to light-load operation. The required heat exchange area and refrigerant quantity decrease further. At this point, some heat exchange tubes can be closed, and more refrigerant not needed for operation can be stored in the closed tubes. For example, the first multi-pipe adjustable valve 417, the second multi-pipe adjustable valve 418, the third multi-pipe adjustable valve 419, and the fourth multi-pipe adjustable valve 420 can be controlled to prevent refrigerant from flowing into and out of the third and seventh heat exchange tubes 313 and 323. This allows a suitable amount of refrigerant to be stored in the third and seventh heat exchange tubes 313 and 323, preventing them from participating in system operation. Based on this principle, when the required heat exchange volume decreases further, any number of multi-pipe adjustable valves can be controlled to close more heat exchange tubes, preventing the closed tubes and corresponding refrigerant from participating in system operation, improving overall system energy efficiency, and preventing damage to system components. Conversely, when the required heat exchange is small, the system operates under light load, with most heat exchange tubes closed. At this time, most of the heat exchange tubes and the refrigerant stored in them do not participate in system operation. When the required heat exchange increases, the system transitions from light load operation to medium load operation, requiring a corresponding increase in heat exchange area and refrigerant quantity. In this case, some heat exchange tubes can be opened, and the refrigerant stored in them can be released into the system to participate in system operation, thereby increasing the effective heat exchange area to adapt to the increased heat exchange demand. For example, the first multi-pipe adjustable valve 417, the second multi-pipe adjustable valve 418, the third multi-pipe adjustable valve 419, and the fourth multi-pipe adjustable valve 420 can be controlled to allow refrigerant to flow into and out of the fourth heat exchange tube 314 and the eighth heat exchange tube 324 to participate in system operation, and to release the refrigerant stored in these heat exchange tubes into the system to participate in heat exchange.When the required heat exchange volume increases further, the system transitions from medium-load to heavy-load operation, requiring a larger heat exchange area and a larger amount of refrigerant. At this point, some heat exchange tubes can be opened, releasing more refrigerant into the system. For example, the first multi-pipe adjustable valve 417, the second multi-pipe adjustable valve 418, the third multi-pipe adjustable valve 419, and the fourth multi-pipe adjustable valve 420 can be controlled to allow refrigerant to flow into and out of the third and seventh heat exchange tubes 313 and 323, participating in system operation. This also allows the refrigerant stored in these heat exchange tubes to be released into the system and participate in heat exchange. Based on this principle, when the required heat exchange volume increases further, any number of multi-pipe adjustable valves can be controlled to open more heat exchange tubes, allowing more heat exchange tubes and stored refrigerant to participate in system operation, increasing heat exchange capacity and meeting the heat exchange demands.

[0051] like Figure 3 As shown, in a specific implementation, in the adjustable heat exchange system, the regulating device 4 is configured as a multi-channel adjustable valve with multiple control elements, namely a first multi-channel adjustable valve 417 to a fourth multi-channel adjustable valve 420; the heat exchanger 3 is configured as a first heat exchanger 31 to an eighth heat exchanger 38. The discharge port 11 of the compressor 1 is connected to one end of the first heat exchanger 31 to the fourth heat exchanger 34 through the first multi-channel adjustable valve 417, and the other end of the first heat exchanger 31 to the fourth heat exchanger 34 is connected to the inlet 21 of the throttling device 2 through the second multi-channel adjustable valve 418. The outlet 22 of the throttling device 2 is connected to one end of the fifth heat exchanger 35 to the eighth heat exchanger 38 through the third multi-channel adjustable valve 419, and the other end of the fifth heat exchanger 35 to the eighth heat exchanger 38 is connected to the suction port 12 of the compressor 1 through the fourth multi-channel adjustable valve 420.

[0052] Specifically, when the required heat exchange is large, the system operates under heavy load, and all or most of the multi-pipe adjustable valves are open. At this time, all or most of the heat exchangers and refrigerant participate in the system operation. When the required heat exchange decreases, the system switches from heavy load operation to medium load operation, and the required heat exchange area and refrigerant quantity decrease accordingly. At this time, some heat exchangers can be shut down, and some refrigerant that does not need to participate in the operation can be stored in those heat exchangers, improving the overall energy efficiency of the system. For example, the first multi-pipe adjustable valve 417, the second multi-pipe adjustable valve 418, the third multi-pipe adjustable valve 419, and the fourth multi-pipe adjustable valve 420 can be controlled to prevent refrigerant from flowing into and out of the first heat exchanger 31 and the eighth heat exchanger 38. This allows an appropriate amount of refrigerant to be stored in the heat exchange tubes of the first heat exchanger 31 and the eighth heat exchanger 38, preventing them from participating in the system operation and reducing the ineffective heat exchange area and excess refrigerant. When the required heat exchange volume decreases further, the system transitions from medium-load operation to light-load operation. The required heat exchange area and refrigerant quantity decrease further. At this point, some heat exchangers can be shut down, and more refrigerant not needed for operation can be stored in the heat exchanger tubes of the shut-down heat exchangers. For example, the first multi-pipe adjustable valve 417, the second multi-pipe adjustable valve 418, the third multi-pipe adjustable valve 419, and the fourth multi-pipe adjustable valve 420 can be controlled to prevent refrigerant from flowing into and out of the second and seventh heat exchangers 32 and 37, allowing a suitable amount of refrigerant to be stored in them. The second and seventh heat exchangers 32 and 37 no longer participate in system operation. Based on this principle, when the required heat exchange volume decreases further, any number of multi-pipe adjustable valves can be controlled to shut down more heat exchangers, preventing the heat exchanger tubes and corresponding refrigerant from participating in system operation, improving overall system energy efficiency, and preventing damage to system components. Conversely, when the required heat exchange is small, the system operates under light load, with most heat exchangers closed. At this time, most heat exchangers and the refrigerant stored in their heat exchange tubes do not participate in system operation. When the required heat exchange increases, the system transitions from light load operation to medium load operation, requiring a corresponding increase in heat exchange area and refrigerant quantity. In this case, some heat exchangers can be opened, and the refrigerant stored in their heat exchange tubes can be released into the system to participate in system operation, thereby increasing the effective heat exchange area to accommodate the increased heat exchange demand. For example, the first multi-pipe adjustable valve 417, the second multi-pipe adjustable valve 418, the third multi-pipe adjustable valve 419, and the fourth multi-pipe adjustable valve 420 can be controlled to allow refrigerant to flow into and out of the first heat exchanger 31 and the eighth heat exchanger 38 to participate in system operation, and to release the refrigerant stored in these heat exchangers into the system to participate in heat exchange.When the required heat exchange volume increases further, the system transitions from medium-load operation to heavy-load operation, requiring a larger heat exchange area and a larger amount of refrigerant. At this point, some heat exchangers can be opened, releasing more refrigerant into the system. For example, the first multi-pipe adjustable valve 417, the second multi-pipe adjustable valve 418, the third multi-pipe adjustable valve 419, and the fourth multi-pipe adjustable valve 420 can be controlled to allow refrigerant to flow into and out of the second and seventh heat exchangers 32 and 37, participating in system operation. This also allows the refrigerant stored in the heat exchange tubes of these heat exchangers to be released into the system and participate in heat exchange. Based on this principle, when the required heat exchange volume increases further, any number of multi-pipe adjustable valves can be controlled to open more heat exchangers, allowing more heat exchangers and stored refrigerant to participate in system operation, increasing heat exchange capacity and meeting heat exchange demands. In this embodiment, the heat exchangers are essentially connected in parallel within the system, and the control and regulation devices are used to adjust the timing of each heat exchanger's participation in system operation. Optionally, the heat exchanger can be configured as a single-tube heat exchanger, a multi-tube heat exchanger, or a combination thereof. The more heat exchangers or heat exchange tubes are used, the greater the range and the wider the adjustable effective heat exchange area and refrigerant usage. Similarly, the various regulating devices in the system can be configured as any device that can be used to open or close the heat exchange flow path of the heat exchange system. The use of different types of regulating devices or their combinations can also improve the reliability of system control.

[0053] like Figure 4As shown in the illustration, in a specific implementation, in the adjustable heat exchange system, the regulating device 4 is configured with a single-channel control element solenoid valve, namely, the first solenoid valve 41 to the sixth solenoid valve 46; the heat exchanger 3 is configured as a first heat exchanger 31 and a second heat exchanger 32. The first heat exchanger 31 includes a first heat exchange tube 311 and a second heat exchange tube 312, and the second heat exchanger 32 includes a fifth heat exchange tube 321 and a sixth heat exchange tube 322. The exhaust port 11 of the compressor 1 is connected to one end of the first heat exchange tube 311 of the first heat exchanger 31. The other end of the first heat exchange tube 311 is connected to one end of the second heat exchange tube 312 through the first solenoid valve 41. At the same time, this end of the first heat exchange tube 311 is also connected to the liquid inlet 21 of the throttling device 2 through the third solenoid valve 43. The end of the second heat exchange tube 312 that is not connected to the first solenoid valve 41 is connected to the liquid inlet 21 of the throttling device 2 through the second solenoid valve 42. The liquid outlet 22 of the throttling device 2 is connected to one end of the fifth heat exchange tube 321 of the second heat exchanger 32. The other end of the fifth heat exchange tube 321 is connected to one end of the sixth heat exchange tube 322 through the fourth solenoid valve 44. At the same time, the end of the fifth heat exchange tube 321 not connected to the liquid outlet 22 is also connected to the suction port 12 of the compressor 1 through the fifth solenoid valve 45. The end of the sixth heat exchange tube 322 not connected to the fourth solenoid valve 44 is connected to the suction port 12 of the compressor 1 through the sixth solenoid valve 46.

[0054] Specifically, when the required heat exchange is large, the system operates under heavy load, all solenoid valves are open, and all heat exchanger tubes and refrigerant participate in system operation. When the required heat exchange decreases, the system switches from heavy load operation to medium or light load operation, and the required heat exchange area and refrigerant amount decrease accordingly. At this time, some heat exchanger tubes can be closed, and some refrigerant that does not need to participate in operation can be stored in these heat exchanger tubes to improve the overall energy efficiency of the system and protect system components. For example, the first solenoid valve 41, the second solenoid valve 42, the fourth solenoid valve 44, and the sixth solenoid valve 46 can be closed to prevent refrigerant from flowing into or out of the second heat exchanger tube 312 and the sixth heat exchanger tube 322, thus storing some unnecessary refrigerant in the second heat exchanger tube 312 and the sixth heat exchanger tube 322. Conversely, when the required heat exchange is small, the system operates under light load, some solenoid valves are open, and some heat exchanger tubes and some refrigerant participate in system operation. When the required heat exchange increases, the system transitions from light-load to medium-load or heavy-load operation, correspondingly increasing the required heat exchange area and refrigerant quantity. In this case, some of the closed heat exchange tubes can be opened, releasing the refrigerant stored in those tubes into the system to participate in system operation and meet the heat exchange demands. For example, the first solenoid valve 41, the second solenoid valve 42, the fourth solenoid valve 44, and the sixth solenoid valve 46 can be opened to allow refrigerant to flow into or out of the second heat exchange tube 312 and the sixth heat exchange tube 322, releasing the refrigerant stored in these tubes into the system to participate in heat exchange. In this embodiment, the heat exchange tubes are connected in series. Adjustment devices at both ends of some heat exchange tubes can control their timely participation in system operation, achieving the purpose of adjusting the effective heat exchange area and refrigerant quantity. Optionally, connecting more heat exchange tubes in series can expand the adjustable range of the entire system and increase the adjustable amplitude. In a series connection, heat exchange tubes or heat exchangers can also be connected in parallel to achieve better regulation.

[0055] This embodiment provides a control method for an adjustable heat exchange system, applied to the aforementioned adjustable heat exchange system. The control method includes the following steps:

[0056] Step 1: Obtain the ambient temperature of each heat exchanger set in the system, and determine and control the opening or closing of the corresponding adjustment device based on the ambient temperature of each heat exchanger, so that the heat exchange tubes in each heat exchanger are at least partially connected or not connected.

[0057] Step two involves acquiring the central temperature of each heat exchanger and the temperature of the external medium used for heat exchange. Based on the temperature difference between these two temperatures, the corresponding regulating devices are opened or closed to ensure that the heat exchange tubes of each heat exchanger are at least partially conductive or non-conductive. The central temperature of the heat exchanger can be the temperature of the central part of the entire heat exchanger, such as the air temperature at the center of the entire heat exchanger or the internal temperature of the heat exchange tubes. The external medium temperature can be the temperature of the substance outside the heat exchanger that exchanges heat with it, such as the temperature of the air surrounding the heat exchanger when it is in an air environment for heat exchange, or the temperature of the liquid surrounding the heat exchanger when it is in a liquid environment for heat exchange.

[0058] Step 3: Obtain the compressor's suction pressure, discharge pressure, and suction temperature. Based on the peak changes in suction and discharge pressures over a certain period, and the difference between the compressor's suction temperature and the mid-temperature of some heat exchangers, determine and control the opening or closing of the regulating device to ensure that the heat exchange tubes of each heat exchanger are at least partially connected or not connected.

[0059] This embodiment provides an adjustable heat exchange system and its control method, such as Figure 1 As shown, the adjustable heat exchange system includes a first heat exchanger 31, a second heat exchanger 32, a compressor 1, a throttling device 2, and regulating devices, including first solenoid valves 41 to sixteenth solenoid valves 416. The first heat exchanger 31 includes four heat exchange tubes, namely the first heat exchange tube 311 to the fourth heat exchange tube 314. Correspondingly, the first heat exchange tube 311 to the fourth heat exchange tube 314 can be regarded as flow path 1 to flow path 4 in sequence, that is, the first heat exchange tube 311 is flow path 1, the second heat exchange tube 312 is flow path 2, and so on. The heat exchange areas of the first heat exchange tube 311 to the fourth heat exchange tube 314 are S1, S2, S3, and S4 in sequence. S1 < S2 < S3 < S4, and (S1+S2) < (S1+S3) < (S2+S3) < (S1+S4) < (S2+S4) < (S3+S4), and (S1+S2+S3) < (S1+S2+S4) < (S1+S3+S4) < (S2+S3+S4). The second heat exchanger 32 includes four heat exchange tubes, namely the fifth heat exchange tube 321 to the eighth heat exchange tube 324. Correspondingly, the fifth heat exchange tube 321 to the eighth heat exchange tube 324 can be regarded as flow paths 5 to 8, that is, the fifth heat exchange tube 321 is flow path 5, the sixth heat exchange tube 322 is flow path 6, etc.; the heat exchange areas of the fifth heat exchange tube 321 to the eighth heat exchange tube 324 are S5, S6, S7, and S8, respectively. S5<S6<S7<S8, and (S5+S6)<(S5+S7)<(S6+S7)<(S5+S8)<(S6+S8)< (S7+S8), and (S5+S6+S7)<(S5+S6+S8)<(S5+S7+S8)<(S6+S7+S8).

[0060] like Figures 5 to 11As shown, the control method includes: system operation, operation parameter detection, acquisition of relevant parameter detection values, calculation of the required calculated values ​​using some of the detection values, judgment based on the relationship between the detection values ​​and calculated values ​​and preset values ​​or preset intervals, and control adjustment device to adjust the conduction or closure of at least some heat exchange tubes of the heat exchanger.

[0061] Obtain the suction pressure Pe, discharge pressure Pc, and suction temperature Tx of compressor 1; the ambient temperature Th, external medium temperature T2l, and middle temperature T3l of the first heat exchanger 31; the ambient temperature Tn, external medium temperature T4z, and middle temperature T5z of the second heat exchanger 32.

[0062] Calculate the difference ΔT1 between the middle temperature T3l of the first heat exchanger 31 and the external medium temperature T2l of the first heat exchanger 31, i.e., ΔT1 = T3l - T2l. Calculate the difference ΔT2 between the external medium temperature T4z and the middle temperature T5z of the second heat exchanger 32, i.e., ΔT2 = T4z - T5z. Calculate the difference ΔT5 between the suction temperature Tx of the compressor 1 and the middle temperature T5z of the second heat exchanger 32, i.e., ΔT5 = Tx - T5z. Calculate the difference ΔPe between the maximum and minimum suction pressure Pe of the compressor 1 within the first cycle t1. Optionally, the first cycle t1 can be 2 minutes or any time period. Calculate the difference ΔPc between the maximum and minimum discharge pressure Pc of the compressor 1 within the second cycle t2. Optionally, the second cycle t2 can be 2 minutes or any time period.

[0063] Specifically, after obtaining the ambient temperature Th of the first heat exchanger 31, based on the ambient temperature Th, select to open part or all of the flow paths 1 to 4 of the first heat exchanger 31. Eight temperature ranges are preset: the first outdoor unit temperature range T1 to T2, where T1 < T2; the second outdoor unit temperature range T3 to T4, where T3 < T4; the third outdoor unit temperature range T5 to T6, where T5 < T6; the fourth outdoor unit temperature range T7 to T8, where T7 < T8; the first indoor unit temperature range T1 to Ta, where T1 < Ta; the second indoor unit temperature range Ta to Tb, where Ta < Tb; the third indoor unit temperature range Tb to Tc, where Tb < Tc; and the fourth indoor unit temperature range Tc to T8, where Tc < T8.

[0064] like Figure 5 As shown, when the ambient temperature Th of the first heat exchanger 31 is in the first outdoor unit temperature range, i.e., T1 < Th < T2, one flow path of the first heat exchanger 31 is selected to be opened, and the other flow paths are used to store refrigerant. When the ambient temperature Th of the first heat exchanger 31 is in the first indoor unit temperature range, i.e., T1 < Th < Ta, one flow path of the second heat exchanger 32 is selected to be opened, and the other flow paths are used to store refrigerant.

[0065] When the ambient temperature Th of the first heat exchanger 31 is in the second outdoor unit temperature range (T3 < Th < T4), two flow paths of the first heat exchanger 31 are opened, and the other flow paths are used to store refrigerant. When the ambient temperature Th of the first heat exchanger 31 is in the second indoor unit temperature range (Ta < Th < Tb), two flow paths of the second heat exchanger 32 are opened, and the other flow paths are used to store refrigerant. Optionally, the lowest value of the second outdoor unit temperature range is greater than or equal to the highest value of the first outdoor unit temperature range, and the lowest value of the second indoor unit temperature range is greater than or equal to the highest value of the first indoor unit temperature range.

[0066] When the ambient temperature Th of the first heat exchanger 31 is within the third outdoor unit temperature range (T5 < Th < T6), three flow paths of the first heat exchanger 31 are activated, and the other flow paths are used to store refrigerant. When the ambient temperature Th of the first heat exchanger 31 is within the third indoor unit temperature range (Tb < Th < Tc), three flow paths of the second heat exchanger 32 are activated, and the other flow paths are used to store refrigerant. Optionally, the lowest value of the third outdoor unit temperature range is greater than or equal to the highest value of the second outdoor unit temperature range, and the lowest value of the third indoor unit temperature range is greater than or equal to the highest value of the second indoor unit temperature range.

[0067] When the ambient temperature Th of the first heat exchanger 31 is within the fourth outdoor unit temperature range (T7 < Th < T8), all four flow paths of the first heat exchanger 31 are opened. Similarly, when the ambient temperature Th of the first heat exchanger 31 is within the fourth indoor unit temperature range (Tc < Th < T8), all four flow paths of the second heat exchanger 32 are opened. Optionally, the lowest value in the fourth outdoor unit temperature range is greater than or equal to the highest value in the third outdoor unit temperature range, and the lowest value in the fourth indoor unit temperature range is greater than or equal to the highest value in the third indoor unit temperature range.

[0068] Furthermore, multiple temperature ranges are preset, such as the first temperature range T100~T101, where T100 < T101; the second temperature range T101~T102, where T101 < T102; the third temperature range T102~T103, where T102 < T103; the fourth temperature range T103~T104, where T103 < T104; the sixteenth temperature range T115~T116, where T115 < T116; the seventeenth temperature range T116~T117, where T116 < T117; the eighteenth temperature range T117~T118, where T117 < T118; and the nineteenth temperature range T118~T119, where T118 < T119, etc. By obtaining the ambient temperature Tn of the second heat exchanger 32, and based on the relationship between the ambient temperature Tn of the second heat exchanger 32 and multiple set temperature ranges, it is determined whether the first heat exchanger 31 or the second heat exchanger 32 should specifically open a certain flow path or a combination of several flow paths. Optionally, the lower the ambient temperature, the larger the required heat exchange area and the more flow paths of the heat exchanger need to be opened. The temperature range can be set corresponding to the required heat exchange area. The following example, with reference to the attached figures, illustrates this further. Figure 1 and Figure 6 As shown, when the ambient temperature Th of the first heat exchanger 31 is within the first outdoor unit temperature range (T1 < Th < T2), one flow path of the first heat exchanger 31 is opened. Simultaneously, when the ambient temperature Tn of the second heat exchanger 32 is within the first temperature range (T100 < Tn < T101), flow path 4 of the first heat exchanger 31 is opened. Flow paths 1, 2, and 3 are used to store refrigerant, and the flow paths are closed after the refrigerant is stored. If the ambient temperature Tn of the second heat exchanger 32 is within the second temperature range (T101 < Tn < T102), flow path 3 of the first heat exchanger 31 is opened. Flow paths 1, 2, and 4 are used to store refrigerant, and the flow paths are closed after the refrigerant is stored. Similarly, other flow paths can be selected to be opened based on the range of Tn. Figure 1 and Figure 7As shown, when the ambient temperature Th of the first heat exchanger 31 is within the first indoor unit temperature range (T1 < Th < Ta), one flow path of the second heat exchanger 32 is opened. Simultaneously, when the ambient temperature Tn of the second heat exchanger 32 is within the sixteenth temperature range (T115 < Tn < T116), flow path 8 of the second heat exchanger 32 is opened. Flow paths 5, 6, and 7 are used to store refrigerant, and the flow paths are closed after the refrigerant is stored. If the ambient temperature Tn of the second heat exchanger 32 is within the seventeenth temperature range (T116 < Tn < T117), flow path 7 of the second heat exchanger 32 is opened. Flow paths 5, 6, and 8 are used to store refrigerant, and the flow paths are closed after the refrigerant is stored. Similarly, other flow paths can be opened depending on the range of Tn. The above are just examples. When the system is equipped with multiple heat exchangers or multiple heat exchange tubes, multiple temperature ranges can be set according to the above method. The relationship between the ambient temperature of multiple heat exchangers and the temperature range can be used to determine the specific method for each heat exchanger to select the heat exchange tube to turn on or store refrigerant after the system starts to run. This will not be elaborated here.

[0069] Specifically, the first heat exchanger is preset to a set temperature Tls, with a stable range of T11 to T12, and T11 < T12; the second heat exchanger is preset to a set temperature Tzs, with a stable range of T9 to T10, and T9 < T10; the compressor is preset to a decision temperature Ts, and 0 < Ts. For example... Figure 1 and Figure 5As shown, after determining the open flow paths of the first heat exchanger 31 and the second heat exchanger 32 in the initial stage, the heat exchange system continues to monitor operating parameters. When the difference ΔT2 between the external medium temperature T4z and the middle temperature T5z of the second heat exchanger 32 is less than the set temperature Tzs of the second heat exchanger (i.e., ΔT2 < Tzs); and the difference ΔT1 between the middle temperature T3l and the external medium temperature T2l of the first heat exchanger 31 is less than the set temperature Tls of the first heat exchanger (i.e., ΔT1 < Tls); and the difference ΔT5 between the suction temperature Tx of the compressor 1 and the middle temperature T5z of the second heat exchanger 32 is greater than the compressor's judgment temperature Ts (i.e., ΔT5 > Ts), the system opens a portion of the regulating device, opens a portion of the flow path to release some refrigerant from the heat exchange tubes that do not participate in the circulation into the system, replenishes the refrigerant, and allows more heat exchange tubes to participate in the system's heat exchange. When the difference ΔT2 between the external medium temperature T4z and the middle temperature T5z of the second heat exchanger 32 is within the stable range of the second heat exchanger (i.e., T9 < ΔT2 < T10); and the difference ΔT1 between the middle temperature T3l and the external medium temperature T2l of the first heat exchanger 31 is within the stable range of the first heat exchanger (i.e., T11 < ΔT1 < T12); and the difference ΔT5 between the suction temperature Tx of the compressor 1 and the middle temperature T5z of the second heat exchanger 32 is less than the compressor judgment temperature Ts and greater than 0 (i.e., 0 < ΔT5 < Ts), the system will no longer open or close the regulating device, and all regulating devices will remain in their current state to stabilize the refrigerant usage in the heat exchange tubes participating in the cycle, thereby stabilizing the heat exchange area of ​​the system and achieving the current optimal state.

[0070] In one specific implementation, the first judgment pressure of the compressor is preset to a MPa. The difference ΔPe between the maximum and minimum values ​​of the suction pressure Pe of compressor 1 during the first cycle t1 is calculated. The difference ΔPc between the maximum and minimum values ​​of the discharge pressure Pc of compressor 1 during the second cycle t2 is calculated. Optionally, both the first cycle t1 and the second cycle t2 are 2 minutes. Figure 1 and Figure 8 As shown, excess refrigerant in the system can be collected using the heat exchanger tubes of the first heat exchanger 31 that do not participate in the circulation. Optionally, the fifth solenoid valve 45, the sixth solenoid valve 46, the seventh solenoid valve 47, and the eighth solenoid valve 48 are closed. When ΔPe < aMPa and ΔPc < aMPa are simultaneously satisfied, the second solenoid valve 42, the third solenoid valve 43, and the fourth solenoid valve 44 are closed, and the eighth solenoid valve 48 is opened, putting the fourth heat exchanger tube 314 in a conducting state, and closing the first heat exchanger tube 311, the second heat exchanger tube 312, and the third heat exchanger tube 313, using the closed heat exchanger tubes for refrigerant storage. Figure 1 and Figure 9As shown, excess refrigerant in the system can be collected using the heat exchanger tubes of the second heat exchanger 32 that do not participate in the circulation. Optionally, the thirteenth solenoid valve 413, the fourteenth solenoid valve 414, the fifteenth solenoid valve 415, and the sixteenth solenoid valve 416 are closed. When ΔPe < aMPa and ΔPc < aMPa are simultaneously satisfied, the ninth solenoid valve 49, the tenth solenoid valve 410, and the eleventh solenoid valve 411 are closed, and the sixteenth solenoid valve 416 is opened. This keeps the eighth heat exchanger tube 324 in a flowing state, while the fifth heat exchanger tube 321, the sixth heat exchanger tube 322, and the seventh heat exchanger tube 323 are closed, allowing refrigerant to be stored using the closed heat exchanger tubes.

[0071] like Figure 1 and Figure 10 As shown, the heat exchange area and refrigerant quantity of the system can be adjusted using the heat exchange tubes of the first heat exchanger 31. Optionally, with the fourth heat exchange tube 314 in a flow state, the second solenoid valve 42, the third solenoid valve 43, and the fourth solenoid valve 44 are open. When T9 < ΔT2 < T10, T11 < ΔT1 < T12, and 0 < ΔT5 < Ts are simultaneously satisfied, the second solenoid valve 42, the third solenoid valve 43, and the fourth solenoid valve 44 are closed.

[0072] like Figure 1 and Figure 11 As shown, the heat exchange tubes of the second heat exchanger 32 can be used to adjust the heat exchange area and refrigerant quantity of the system. Optionally, with the eighth heat exchange tube 324 in the flow state, the ninth solenoid valve 49, the tenth solenoid valve 410, and the eleventh solenoid valve 411 are open. When T9 < ΔT2 < T10, T11 < ΔT1 < T12, and 0 < ΔT5 < Ts are simultaneously satisfied, the ninth solenoid valve 49, the tenth solenoid valve 410, and the eleventh solenoid valve 411 are closed.

[0073] This embodiment provides an air conditioner, which includes the aforementioned adjustable heat exchange system. For example... Figure 1 As shown, optionally, the first heat exchanger 31 can be an outdoor heat exchanger, and the second heat exchanger 32 can be an indoor heat exchanger. When the indoor environment is in cooling mode, the first heat exchanger 31 acts as a condenser, and the second heat exchanger 32 acts as an evaporator; when the indoor environment is in heating mode, the first heat exchanger 31 acts as an evaporator, and the second heat exchanger 32 acts as a condenser. When the air conditioner is running, water vapor in the air may condense on the surface of the heat exchange tubes of the heat exchanger, forming frost. Frost can affect the heat exchange efficiency of the heat exchanger. Air conditioners with adjustable heat exchange systems can switch different heat exchange tubes to stop the operation of the frosted heat exchange tubes, gradually melting the frost using natural temperature differences, restoring the heat exchange tubes to normal operation, thus achieving a defrosting effect without stopping the air conditioner.

[0074] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention. It will be readily understood by those skilled in the art that, without conflict, the above-mentioned advantageous technical features can be freely combined and superimposed.

Claims

1. An adjustable heat exchange system, characterized in that, include: A compressor, a throttling device, at least two heat exchangers, and at least two regulating devices; the compressor is connected to one of the heat exchangers via one of the regulating devices, and the throttling device is connected to another of the heat exchangers via the other regulating device; each heat exchanger includes heat exchange tubes connected to the regulating devices. The system is provided with a first heat exchanger and a second heat exchanger. Both the first heat exchanger and the second heat exchanger are provided with at least two heat exchange tubes. The two ends of the heat exchange tubes are connected to different regulating devices. When the difference between the temperature at the middle of the first heat exchanger and the temperature of the external medium of the first heat exchanger is less than the first set temperature, and the difference between the temperature of the external medium of the second heat exchanger and the temperature at the middle of the second heat exchanger is less than the second set temperature, and the difference between the compressor suction temperature and the temperature at the middle of the second heat exchanger is greater than the third set temperature, the regulating device is opened to increase the number of heat exchange tubes in operation. When the temperature difference between the external medium temperature of the second heat exchanger and the middle temperature of the second heat exchanger is within the stable range of the second heat exchanger, and the temperature difference between the middle temperature of the first heat exchanger and the external medium temperature of the first heat exchanger is within the stable range of the first heat exchanger, and the temperature difference between the suction temperature of the compressor and the middle temperature of the second heat exchanger is less than the compressor's judgment temperature Ts and greater than 0, all regulating devices maintain their current state.

2. The adjustable heat exchange system according to claim 1, characterized in that, The regulating device is provided between the heat exchange tubes.

3. The adjustable heat exchange system according to claim 1, characterized in that, At least a portion of the heat exchangers are connected in parallel to the regulating device.

4. The adjustable heat exchange system according to claim 3, characterized in that, The heat exchanger is provided with at least two heat exchange tubes.

5. The adjustable heat exchange system according to claim 4, characterized in that, The regulating device is provided between the heat exchange tubes.

6. The adjustable heat exchange system according to claim 5, characterized in that, The regulating device is provided between at least two of the heat exchangers.

7. The adjustable heat exchange system according to claim 6, characterized in that, The heat exchange tubes of the heat exchangers have different heat exchange areas.

8. The adjustable heat exchange system according to any one of claims 1-7, characterized in that, The regulating device is a single-channel control element and / or a multi-channel control element.

9. The adjustable heat exchange system according to claim 8, characterized in that, The single-channel control element is a solenoid valve, and the multi-channel control element is a multi-pipe adjustable valve.

10. A control method for an adjustable heat exchange system, characterized in that, The method is applied to the adjustable heat exchange system according to any one of claims 1-9, comprising: Step 1: Obtain the ambient temperature of the at least two heat exchangers, and control the adjustment device to open or close according to the ambient temperature, so that each heat exchange tube is either connected or disconnected. Step 2: Obtain the mid-temperature and external medium temperature of the at least two heat exchangers, and control the regulating device to open or close based on the difference between the mid-temperature and the external medium temperature, so that each heat exchange tube is either connected or disconnected. Step 3: Obtain the suction pressure, discharge pressure, and suction temperature of the compressor. Based on the suction pressure, discharge pressure, and the difference between the suction temperature and the intermediate temperature, control the regulating device to open or close, so that each heat exchange tube is either connected or disconnected.

11. The control method according to claim 10, characterized in that, The system includes a first heat exchanger and a second heat exchanger. The first heat exchanger includes L heat exchange tubes, and the second heat exchanger includes Q heat exchange tubes. Step one includes: obtaining the ambient temperature of the first heat exchanger; and, based on the ambient temperature, controlling a regulating device connected to the L heat exchange tubes to open M heat exchange tubes of the first heat exchanger, and controlling a regulating device connected to the Q heat exchange tubes of the second heat exchanger to open N heat exchange tubes of the second heat exchanger, wherein M is less than or equal to L, and N is less than or equal to Q.

12. The control method according to claim 11, characterized in that, L is 4, and Q is 4.

13. The control method according to claim 12, characterized in that, Based on the obtained ambient temperature of the first heat exchanger, controlling the regulating device connected to the L heat exchange tubes to open M heat exchange tubes of the first heat exchanger, and controlling the regulating device connected to the Q heat exchange tubes of the second heat exchanger to open N heat exchange tubes of the second heat exchanger includes: When the ambient temperature is in the first outdoor unit temperature range, control to open one heat exchange tube of the first heat exchanger; and when the ambient temperature is in the first indoor unit temperature range, control to open one heat exchange tube of the second heat exchanger. Alternatively, when the ambient temperature is in the second outdoor unit temperature range, control the opening of two heat exchange tubes of the first heat exchanger, and when the ambient temperature is in the second indoor unit temperature range, control the opening of two heat exchange tubes of the second heat exchanger. Alternatively, when the ambient temperature is within the third outdoor unit temperature range, control the opening of three heat exchange tubes of the first heat exchanger, and when the ambient temperature is within the third indoor unit temperature range, control the opening of three heat exchange tubes of the second heat exchanger. Alternatively, when the ambient temperature is within the fourth outdoor unit temperature range, control the opening of four heat exchange tubes of the first heat exchanger, and when the ambient temperature is within the fourth indoor unit temperature range, control the opening of four heat exchange tubes of the second heat exchanger.

14. An air conditioner, characterized in that, The air conditioner includes the adjustable heat exchange system according to any one of claims 1-9.

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