Heat recovery multi-split air conditioning system and its control method

Abstract

This invention discloses a heat recovery multi-split air conditioning system and its control method. The system includes an outdoor unit, at least two indoor units, and mode converters corresponding to each indoor unit. Each mode converter includes at least a first mode converter and a second mode converter, both of which include control valve assemblies for controlling refrigerant flow. When the indoor units corresponding to the first and second mode converters simultaneously switch operating modes, both converters simultaneously close the already opened control valve assemblies and gradually open the control valves in both converters corresponding to the operating mode to be switched. This invention solves the problem in the prior art where heat recovery multi-split systems cannot be compatible with two mode converters, improves the operational stability of the system, and reduces operating noise.

Description

Technical Field

[0001] This invention relates to the field of heat recovery multi-split air conditioning technology, and more specifically, to a heat recovery multi-split air conditioning system and its control method. Background Technology

[0002] The heat recovery multi-split air conditioning system consists of an outdoor unit, an indoor unit, and a mode converter. The mode converter is an important component that connects the outdoor unit and the indoor unit and controls the operating mode of the indoor unit.

[0003] In existing heat recovery multi-split air conditioning systems, two common mode converters are used: one employing a solenoid valve to control refrigerant flow, and the other using an electronic expansion valve. These two mode converters have different control methods, and the outdoor unit in existing multi-split systems is often only compatible with one type of mode converter. If an incorrect mode converter is used with the outdoor unit, or if both mode converters are used simultaneously, control errors will occur, resulting in poor performance or abnormal operating noise.

[0004] There is currently no effective solution to the problem that heat recovery multi-split systems in related technologies are incompatible with converters for both modes. Summary of the Invention

[0005] This invention provides a heat recovery multi-split air conditioning system and its control method, which at least solves the problem that heat recovery multi-split systems in the prior art cannot be compatible with two mode converters.

[0006] To address the aforementioned technical problems, according to one aspect of the present invention, a heat recovery multi-split air conditioning system is provided, comprising:

[0007] An outdoor unit, at least two indoor units, and a mode converter that corresponds to each indoor unit; the mode converter includes at least a first mode converter and a second mode converter, both of which include a control valve assembly for controlling the refrigerant flow direction;

[0008] The control valve assembly of the first mode converter includes: a high-pressure solenoid valve, a low-pressure solenoid valve, a high-pressure balancing valve connected in parallel with the high-pressure solenoid valve, and a low-pressure balancing valve connected in parallel with the low-pressure solenoid valve.

[0009] The control valve assembly of the second mode converter includes: a high-pressure electronic expansion valve and a low-pressure electronic expansion valve;

[0010] When the indoor units corresponding to the first mode converter and the second mode converter switch operating modes simultaneously, the first mode converter and the second mode converter simultaneously close the opened control valve components, and simultaneously gradually open the control valves in the first mode converter and the second mode converter corresponding to the operating mode to be switched.

[0011] Based on further improvements to the above scheme, when the indoor units corresponding to the first mode converter and the second mode converter simultaneously switch from cooling mode to heating mode, the low-pressure solenoid valve and low-pressure balance valve of the first mode converter are closed, and the low-pressure electronic expansion valve of the second mode converter is closed; after a first preset time, the high-pressure balance valve of the first mode converter is opened, and the high-pressure electronic expansion valve of the second mode converter is opened for a preset number of steps; after a second preset time, the high-pressure solenoid valve of the first mode converter is opened, and the high-pressure electronic expansion valve of the second mode converter is fully opened.

[0012] When the indoor units corresponding to the first mode converter and the second mode converter simultaneously switch from heating mode to cooling mode, the high-pressure solenoid valve and high-pressure balance valve of the first mode converter are closed, and the high-pressure electronic expansion valve of the second mode converter is closed at the same time; after a third preset time, the low-pressure balance valve of the first mode converter is opened, and the low-pressure electronic expansion valve of the second mode converter is opened for a preset number of steps; after a fourth preset time, the low-pressure solenoid valve of the first mode converter is opened, and the low-pressure electronic expansion valve of the second mode converter is fully opened.

[0013] Based on the further improvement of the above scheme, the indoor units corresponding to the first mode converter and the second mode converter do not switch the operating mode at the same time, and when the indoor unit corresponding to the first mode converter or the second mode converter switches from the cooling mode to the heating mode, the low-pressure solenoid valve and the low-pressure balance valve are closed, the high-pressure balance valve is opened after the fifth preset time, the high-pressure solenoid valve is opened after the sixth preset time, or the low-pressure electronic expansion valve is closed, the high-pressure electronic expansion valve is opened for a certain number of steps after the seventh preset time, and the high-pressure electronic expansion valve is fully opened after the eighth time.

[0014] When the indoor units corresponding to the first mode converter and the second mode converter do not switch operating modes at the same time, and when the indoor unit corresponding to the first mode converter or the second mode converter switches from heating mode to cooling mode, the high-pressure solenoid valve and the high-pressure balance valve are closed, the low-pressure balance valve is opened after the ninth preset time, the low-pressure solenoid valve is opened after the tenth preset time, or the high-pressure electronic expansion valve is closed, the low-pressure electronic expansion valve is opened for a certain number of steps after the eleventh preset time, and the low-pressure electronic expansion valve is fully opened after the twelfth time.

[0015] Among them, the first preset time is the maximum of the fifth and seventh preset times, the second preset time is the maximum of the sixth and eighth preset times, the third preset time is the maximum of the ninth and eleventh preset times, and the fourth preset time is the maximum of the tenth and twelfth preset times.

[0016] Based on further improvements to the above scheme, both the first mode converter and the second mode converter include a piping assembly. The piping assembly includes a high-pressure air pipe section, a low-pressure air pipe section and an indoor unit air pipe section. One end of the high-pressure air pipe section is connected to the outdoor high-pressure air pipe and the other end is connected to the indoor unit air pipe section. One end of the low-pressure air pipe section is connected to the outdoor low-pressure air pipe and the other end is connected to the indoor unit air pipe section. The indoor unit air pipe section is also connected to the indoor air pipe.

[0017] A high-pressure solenoid valve is installed in the high-pressure gas pipe section of the first mode converter; a high-pressure balancing valve is connected in parallel with the high-pressure solenoid valve, and the flow diameter of the high-pressure balancing valve is smaller than that of the high-pressure solenoid valve; a low-pressure solenoid valve is installed in the low-pressure gas pipe section of the first mode converter; a low-pressure balancing valve is connected in parallel with the low-pressure solenoid valve, and the flow diameter of the low-pressure balancing valve is smaller than that of the low-pressure solenoid valve.

[0018] The high-pressure electronic expansion valve is located in the high-pressure gas pipe section of the second mode converter; the low-pressure electronic expansion valve is located in the low-pressure gas pipe section of the second mode converter.

[0019] According to another aspect of the present invention, a control method for a heat recovery multi-split air conditioning system is provided, applied to the heat recovery multi-split air conditioning system as described above, the method comprising:

[0020] Mode converter for testing heat recovery multi-split air conditioning systems;

[0021] Detect the operating mode of the indoor unit;

[0022] The operation of the mode converter is controlled based on the operating mode of the mode converter and the indoor unit.

[0023] Further improvements to the above scheme include controlling the operation of the mode converter based on the operating modes of the mode converter and the indoor unit, including:

[0024] When the mode converter includes a first mode converter and a second mode converter, and the indoor unit switches operating modes simultaneously, the mode converter corresponding to the indoor unit controls the control valve assembly that has been opened, and simultaneously gradually opens the control valves in the first mode converter and the second mode converter that correspond to the operating mode to be switched.

[0025] Based on further improvements to the above scheme, when the mode converter includes a first mode converter and a second mode converter, and the indoor unit simultaneously switches from cooling mode to heating mode, the mode converter corresponding to the indoor unit is controlled to simultaneously close the already opened control valve assembly, and simultaneously gradually open the control valves in the first and second mode converters corresponding to the operating mode to be switched, including: controlling the low-pressure solenoid valve and low-pressure balance valve of the first mode converter to close, and simultaneously closing the low-pressure electronic expansion valve of the second mode converter; after a first preset time, controlling the high-pressure balance valve of the first mode converter to open, and the high-pressure electronic expansion valve of the second mode converter to open a preset number of steps; after a second preset time, controlling the high-pressure solenoid valve of the first mode converter to open, and the high-pressure electronic expansion valve of the second mode converter to fully open;

[0026] When the mode converter includes a first mode converter and a second mode converter, and the indoor unit simultaneously switches from heating mode to cooling mode, the mode converter corresponding to the indoor unit controls the closed control valve assembly that has been opened, and simultaneously gradually opens the control valves in the first and second mode converters corresponding to the operating mode to be switched, including: controlling the high-pressure solenoid valve and high-pressure balance valve of the first mode converter to close, and the high-pressure electronic expansion valve of the second mode converter to close; after a third preset time, controlling the low-pressure balance valve of the first mode converter to open, and the low-pressure electronic expansion valve of the second mode converter to open a preset number of steps; after a fourth preset time, controlling the low-pressure solenoid valve of the first mode converter to open, and the low-pressure electronic expansion valve of the second mode converter to fully open.

[0027] Further improvements to the above scheme, based on the operating modes of the mode converter and the indoor unit, include controlling the operation of the mode converter according to their respective operating modes:

[0028] When the mode converter includes a first mode converter and a second mode converter, and the indoor units corresponding to the first mode converter and the second mode converter do not switch operating modes at the same time, or when the mode converter only includes a first mode converter or only a second mode converter, the mode converter corresponding to the indoor unit whose operating mode is to be switched closes the already opened control valve assembly and gradually opens the control valve corresponding to the operating mode to be switched.

[0029] Based on the further improvement of the above scheme, when the operating mode to be switched to is heating mode, the mode converter corresponding to the indoor unit to be switched to close the already opened control valve component, and gradually open the control valve corresponding to the operating mode to be switched, including: controlling the low-pressure solenoid valve and the low-pressure balance valve to close, the high-pressure balance valve to open after the fifth preset time, the high-pressure solenoid valve to open after the sixth preset time, or controlling the low-pressure electronic expansion valve to close, the high-pressure electronic expansion valve to open a certain number of steps after the seventh preset time, and the high-pressure electronic expansion valve to fully open after the eighth time.

[0030] When the operating mode to be switched to is cooling mode, the mode converter corresponding to the indoor unit to be switched to close the already opened control valve assembly and gradually open the control valve corresponding to the operating mode to be switched to, including: controlling the high pressure solenoid valve and the high pressure balance valve to close, the low pressure balance valve to open after the ninth preset time, the low pressure solenoid valve to open after the tenth preset time, or controlling the high pressure electronic expansion valve to close, the low pressure electronic expansion valve to open a certain number of steps after the eleventh preset time, and the low pressure electronic expansion valve to fully open after the twelfth time.

[0031] Among them, the first preset time is the maximum of the fifth and seventh preset times, the second preset time is the maximum of the sixth and eighth preset times, the third preset time is the maximum of the ninth and eleventh preset times, and the fourth preset time is the maximum of the tenth and twelfth preset times.

[0032] According to another aspect of the present invention, a storage medium containing computer-executable instructions is provided, which, when executed by a computer processor, are used to perform the heat recovery multi-split air conditioning system control method described above.

[0033] This invention provides a heat recovery multi-split air conditioning system compatible with two mode converters. For this system, a control scheme compatible with both mode converters is automatically adopted. Specifically, when the indoor units simultaneously switch operating modes, the first and second mode converters simultaneously close the already opened control valve components and gradually open the control valves in both converters corresponding to the operating mode to be switched. This scheme can simultaneously support two mode converters and avoids mismatches between the converters and control schemes, preventing poor operating performance or abnormal noise. This improves the stability of the heat recovery multi-split air conditioning system and reduces operating noise. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of an optional structure of a heat recovery multi-split air conditioning system according to an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of another optional structure of the heat recovery multi-split air conditioning system according to an embodiment of the present invention;

[0036] Figure 3 This is another optional structural schematic diagram of a heat recovery multi-split air conditioning system according to an embodiment of the present invention;

[0037] Figure 4 This is an optional flowchart of a heat recovery multi-split air conditioning system control method according to an embodiment of the present invention.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Outdoor unit; 2. Indoor unit; 3. First mode converter; 4. Second mode converter; 5. Low-pressure bypass valve; 6. Low-pressure solenoid valve; 7. High-pressure bypass valve; 8. High-pressure solenoid valve; 9. Low-pressure electronic expansion valve; 10. High-pressure electronic expansion valve. Detailed Implementation

[0040] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0041] Example 1

[0042] In existing technologies, heat recovery multi-split air conditioning systems typically only have one mode converter, and the control system is only designed for that mode converter. If different mode converters are used, the mismatch between the control system and the mode converter may result in poor operating performance or abnormal noise.

[0043] Figure 1 The diagram shows an optional structure of a heat recovery multi-split air conditioning system, such as... Figure 1 As shown, the heat recovery multi-split air conditioning system includes: an indoor unit, a mode converter, a low-pressure bypass valve, a low-pressure solenoid valve, a high-pressure bypass valve, a high-pressure solenoid valve, and an outdoor unit. Figure 1 The system employs a first mode converter 3, which uses a solenoid valve, though other control valves can also be used. The first mode converter 3 also includes a piping assembly comprising: a high-pressure gas pipe section, a low-pressure gas pipe section, and an indoor unit gas pipe section. One end of the high-pressure gas pipe section connects to the outdoor high-pressure gas pipe, and the other end connects to the indoor unit gas pipe section. One end of the low-pressure gas pipe section connects to the outdoor low-pressure gas pipe, and the other end connects to the indoor unit gas pipe section, which is also connected to the indoor gas pipe. Figure 1 As shown, the high-pressure solenoid valve 8 is installed in the high-pressure air pipe section of the first mode converter 3; the high-pressure balance valve 7 is connected in parallel with the high-pressure solenoid valve 8, and the flow diameter of the high-pressure balance valve 7 is smaller than that of the high-pressure solenoid valve 8; the low-pressure solenoid valve 6 is installed in the low-pressure air pipe section of the first mode converter 3; the low-pressure balance valve 5 is connected in parallel with the low-pressure solenoid valve 6, and the flow diameter of the low-pressure balance valve 5 is smaller than that of the low-pressure solenoid valve 6.

[0044] When only the first mode converter 3 is detected in the system, it is controlled as follows:

[0045] Indoor unit 2 is in cooling operation: the corresponding mode converter opens the low-pressure solenoid valve 6 and the low-pressure balance valve 5, and closes the high-pressure solenoid valve 8 and the high-pressure balance valve 7.

[0046] Indoor unit 2 in heating mode: corresponding mode converter high pressure solenoid valve 8 and high pressure balance valve 7 open, low pressure solenoid valve 6 and low pressure balance valve 5 close;

[0047] When indoor unit 2 switches from cooling operation to heating operation: the corresponding mode converter low-pressure solenoid valve 6 and low-pressure balance valve 5 are closed, and the high-pressure balance valve 7 is opened after time T1, and the high-pressure solenoid valve 8 is opened after time T2.

[0048] When indoor unit 2 switches from heating to cooling operation: the corresponding mode converter high-pressure solenoid valve 8 and high-pressure balance valve 7 are closed, the low-pressure balance valve 5 opens after time T3, and the low-pressure balance valve 5 closes after time T4.

[0049] Figure 2 The diagram shows another optional structure for a heat recovery multi-split air conditioning system, such as... Figure 2 As shown, the heat recovery multi-split air conditioning system includes: a low-pressure electronic expansion valve and a high-pressure electronic expansion valve. Figure 2 The mode converter in the middle is the second mode converter 4, which uses an electronic expansion valve. The second mode converter 4 also includes a piping assembly, which includes a high-pressure gas pipe section, a low-pressure gas pipe section, and an indoor unit gas pipe section. One end of the high-pressure gas pipe section is connected to the outdoor high-pressure gas pipe, and the other end is connected to the indoor unit gas pipe section. One end of the low-pressure gas pipe section is connected to the outdoor low-pressure gas pipe, and the other end is connected to the indoor unit gas pipe section, which is also connected to the indoor gas pipe. Figure 2 As shown, the high-pressure electronic expansion valve 10 is installed in the high-pressure gas pipe section of the second mode converter 4; the low-pressure electronic expansion valve 9 is installed in the low-pressure gas pipe section of the second mode converter 4.

[0050] When only the second-mode converter 4 is detected in the system, control is performed as follows:

[0051] Indoor unit 2 cooling operation: corresponding mode converter low-pressure electronic expansion valve 9 is open, high-pressure electronic expansion valve 10 is closed;

[0052] Indoor unit 2 in heating mode: corresponding mode converter high-pressure electronic expansion valve 10 is open, low-pressure electronic expansion valve 9 is closed;

[0053] When indoor unit 2 switches from cooling operation to heating operation: the low-pressure electronic expansion valve 9 of the corresponding mode converter closes, the high-pressure electronic expansion valve 10 opens a certain number of steps after time t1, and the high-pressure electronic expansion valve 10 is fully opened after time t2.

[0054] When indoor unit 2 switches from heating to cooling operation: the high-pressure electronic expansion valve 10 of the corresponding mode converter closes, the low-pressure electronic expansion valve 9 opens a certain number of steps after time t1, and the low-pressure electronic expansion valve 9 is fully opened after time t2.

[0055] In a preferred embodiment 1 of the present invention, another heat recovery multi-split air conditioning system is also provided. Figure 3 The diagram shows another optional structure for a heat recovery multi-split air conditioning system, such as... Figure 3 As shown, this heat recovery multi-split air conditioning system includes:

[0056] The system includes an outdoor unit 1, at least two indoor units 2, and a mode converter that corresponds one-to-one with each indoor unit 2. The mode converter includes at least a first mode converter 3 and a second mode converter 4, and both the first mode converter 3 and the second mode converter 4 include a control valve assembly for controlling the refrigerant flow.

[0057] The control valve assembly of the first mode converter 3 includes: a high-pressure solenoid valve 8, a low-pressure solenoid valve 6, a high-pressure balancing valve 7 connected in parallel with the high-pressure solenoid valve 8, and a low-pressure balancing valve 5 connected in parallel with the low-pressure solenoid valve 6.

[0058] The control valve assembly of the second mode converter 4 includes: a high-pressure electronic expansion valve 10 and a low-pressure electronic expansion valve 9.

[0059] When the indoor unit 2 corresponding to the first mode converter 3 and the second mode converter 4 simultaneously switches the operating mode, the first mode converter 3 and the second mode converter 4 simultaneously close the opened control valve assembly, and simultaneously gradually open the control valve in the first mode converter 3 and the second mode converter 4 corresponding to the operating mode to be switched.

[0060] In the above embodiments, a heat recovery multi-split air conditioning system compatible with two mode converters is provided. For this heat recovery multi-split air conditioning system, a control scheme compatible with the two mode converters is automatically adopted. In particular, when the indoor units switch operating modes simultaneously, the first mode converter and the second mode converter simultaneously close the already opened control valve components and simultaneously and gradually open the control valves in the first mode converter and the second mode converter corresponding to the operating mode to be switched. The above scheme can be compatible with two mode converters at the same time, and the control of the two mode converters avoids the problem of incorrect matching between converters and control schemes, which leads to poor operating effect or abnormal noise. This improves the stability of the heat recovery multi-split air conditioning system and reduces operating noise.

[0061] Based on further improvements to the above scheme, when the indoor unit 2 corresponding to the first mode converter 3 and the second mode converter 4 simultaneously switches from cooling mode to heating mode, the low-pressure solenoid valve 6 and the low-pressure balance valve 5 of the first mode converter 3 are closed, and the low-pressure electronic expansion valve 9 of the second mode converter 4 is closed; after a first preset time, the high-pressure balance valve 7 of the first mode converter 3 is opened, and the high-pressure electronic expansion valve 10 of the second mode converter 4 is opened for a preset number of steps; after a second preset time, the high-pressure solenoid valve 8 of the first mode converter 3 is opened, and the high-pressure electronic expansion valve 10 of the second mode converter 4 is fully opened;

[0062] When the indoor unit 2 corresponding to the first mode converter 3 and the second mode converter 4 simultaneously switches from heating mode to cooling mode, the high-pressure solenoid valve 8 and the high-pressure balance valve 7 of the first mode converter 3 are closed, and the high-pressure electronic expansion valve 10 of the second mode converter 4 is closed. After a third preset time, the low-pressure balance valve 5 of the first mode converter 3 is opened, and the low-pressure electronic expansion valve 9 of the second mode converter 4 is opened for a preset number of steps. After a fourth preset time, the low-pressure solenoid valve 6 of the first mode converter 3 is opened, and the low-pressure electronic expansion valve 9 of the second mode converter 4 is fully opened.

[0063] In another optional embodiment of the present invention, when the indoor unit 2 corresponding to the first mode converter 3 and the second mode converter 4 does not switch operating modes at the same time, and when the indoor unit 2 corresponding to the first mode converter 3 or the second mode converter 4 switches from cooling mode to heating mode, the low-pressure solenoid valve 6 and the low-pressure balance valve 5 are closed, the high-pressure balance valve 7 is opened after a fifth preset time, the high-pressure solenoid valve 8 is opened after a sixth preset time, or the low-pressure electronic expansion valve 9 is closed, the high-pressure electronic expansion valve 10 is opened a certain number of steps after a seventh preset time, and the high-pressure electronic expansion valve 10 is fully opened after an eighth time.

[0064] When the indoor unit 2 corresponding to the first mode converter 3 and the second mode converter 4 does not switch operating modes at the same time, and when the indoor unit 2 corresponding to the first mode converter 3 or the second mode converter 4 switches from heating mode to cooling mode, the high-pressure solenoid valve 8 and the high-pressure balance valve 7 are closed, the low-pressure balance valve 5 is opened after the ninth preset time, the low-pressure solenoid valve 6 is opened after the tenth preset time, or the high-pressure electronic expansion valve 10 is closed, the low-pressure electronic expansion valve 9 is opened a certain number of steps after the eleventh preset time, and the low-pressure electronic expansion valve 9 is fully opened after the twelfth time.

[0065] Specifically, the first preset time is the maximum of the fifth and seventh preset times; the second preset time is the maximum of the sixth and eighth preset times; the third preset time is the maximum of the ninth and eleventh preset times; and the fourth preset time is the maximum of the tenth and twelfth preset times. These time settings ensure that the control valve components open in an orderly, batch-by-batch manner. During each batch opening process, the control valves of the two-mode converter have sufficient time to complete the predetermined actions, thereby guaranteeing control accuracy.

[0066] As an optional implementation of the above control scheme, when the presence of both the first mode converter 3 and the second mode converter 4 is detected in the system, if the indoor unit under the first mode converter 3 and the indoor unit under the second mode converter 4 switch modes simultaneously, the control shall be performed as follows; otherwise, the two mode converters shall be controlled according to the control methods described above for the sole presence of either the first mode converter 3 or the second mode converter 4:

[0067] When indoor unit 2 switches from cooling operation to heating operation: the low-pressure solenoid valve 6 and low-pressure balance valve 5 of the corresponding first mode converter 3 are closed, and the low-pressure electronic expansion valve 9 of the corresponding second mode converter 4 is closed; after time A1, the high-pressure balance valve 7 of the first mode converter 3 is opened, and the high-pressure electronic expansion valve 10 of the second mode converter 4 is opened a certain number of steps; after time A2, the high-pressure solenoid valve 8 of the first mode converter 3 is opened, and the high-pressure electronic expansion valve 10 of the second mode converter 4 is fully opened;

[0068] When indoor unit 2 switches from heating to cooling operation: the high-pressure solenoid valve 8 and high-pressure balance valve 7 of the corresponding first mode converter 3 are closed, and the high-pressure electronic expansion valve 10 of the corresponding second mode converter 4 is closed; after time A3, the low-pressure balance valve 5 of the first mode converter 3 is opened, and the low-pressure electronic expansion valve 9 of the second mode converter 4 is opened a certain number of steps; after time A4, the low-pressure solenoid valve 6 of the first mode converter 3 is opened, and the low-pressure electronic expansion valve 9 of the second mode converter 4 is fully opened;

[0069] Where A1 is the larger of T1 and t1; A2 is the larger of T2 and t2; A3 is the larger of T3 and t3; and A4 is the larger of T4 and t4.

[0070] When two mode converters are present in the heat recovery multi-split air conditioning system of this invention, it automatically adopts a mode converter compatible with both. That is, by employing the mode converter control technology of this invention, the heat recovery multi-split air conditioning system can be used simultaneously with different types of mode converters, avoiding operational abnormalities caused by incorrect matching and reducing the maintenance difficulty of the heat recovery multi-split air conditioning system.

[0071] Example 2

[0072] Based on the heat recovery multi-split air conditioning system provided in Embodiment 1 above, a preferred embodiment 2 of the present invention further provides a control method for the heat recovery multi-split air conditioning system. Specifically, Figure 4 An optional flowchart of the method is shown, such as Figure 4 As shown, the method includes the following steps S402-S406:

[0073] S402: Mode converter for detecting heat recovery multi-split air conditioning systems;

[0074] S404: Detects the operating mode of the indoor unit;

[0075] S406: Controls the operation of the mode converter based on the operating mode of the mode converter and the indoor unit.

[0076] In the above embodiments, a heat recovery multi-split air conditioning system compatible with two mode converters is provided. For this heat recovery multi-split air conditioning system, a control scheme compatible with the two mode converters is automatically adopted. In particular, when the indoor units switch operating modes simultaneously, the first mode converter and the second mode converter simultaneously close the already opened control valve components and simultaneously and gradually open the control valves in the first mode converter and the second mode converter corresponding to the operating mode to be switched. The above scheme can be compatible with two mode converters at the same time, and the control of the two mode converters avoids the problem of incorrect matching between converters and control schemes, which leads to poor operating effect or abnormal noise. This improves the stability of the heat recovery multi-split air conditioning system and reduces operating noise.

[0077] Further improvements to the above scheme include controlling the operation of the mode converter based on the operating modes of the mode converter and the indoor unit, including:

[0078] When the mode converter includes a first mode converter and a second mode converter, and the indoor unit switches operating modes simultaneously, the mode converter corresponding to the indoor unit controls the control valve assembly that has been opened, and simultaneously gradually opens the control valves in the first mode converter and the second mode converter that correspond to the operating mode to be switched.

[0079] Based on further improvements to the above scheme, when the mode converter includes a first mode converter and a second mode converter, and the indoor unit simultaneously switches from cooling mode to heating mode, the mode converter corresponding to the indoor unit is controlled to simultaneously close the already opened control valve assembly, and simultaneously gradually open the control valves in the first and second mode converters corresponding to the operating mode to be switched, including: controlling the low-pressure solenoid valve and low-pressure balance valve of the first mode converter to close, and simultaneously closing the low-pressure electronic expansion valve of the second mode converter; after a first preset time, controlling the high-pressure balance valve of the first mode converter to open, and the high-pressure electronic expansion valve of the second mode converter to open a preset number of steps; after a second preset time, controlling the high-pressure solenoid valve of the first mode converter to open, and the high-pressure electronic expansion valve of the second mode converter to fully open;

[0080] When the mode converter includes a first mode converter and a second mode converter, and the indoor unit simultaneously switches from heating mode to cooling mode, the mode converter corresponding to the indoor unit controls the closed control valve assembly that has been opened, and simultaneously gradually opens the control valves in the first and second mode converters corresponding to the operating mode to be switched, including: controlling the high-pressure solenoid valve and high-pressure balance valve of the first mode converter to close, and the high-pressure electronic expansion valve of the second mode converter to close; after a third preset time, controlling the low-pressure balance valve of the first mode converter to open, and the low-pressure electronic expansion valve of the second mode converter to open a preset number of steps; after a fourth preset time, controlling the low-pressure solenoid valve of the first mode converter to open, and the low-pressure electronic expansion valve of the second mode converter to fully open.

[0081] The operation of the mode converter is controlled based on the operating modes of the mode converter and the indoor unit, and also includes:

[0082] When the mode converter includes a first mode converter and a second mode converter, and the indoor units corresponding to the first mode converter and the second mode converter do not switch operating modes at the same time, or when the mode converter only includes a first mode converter or only a second mode converter, the mode converter corresponding to the indoor unit whose operating mode is to be switched closes the already opened control valve assembly and gradually opens the control valve corresponding to the operating mode to be switched.

[0083] Specifically, when the operating mode to be switched to is heating mode, the mode converter corresponding to the indoor unit to be switched to closes the already opened control valve component and gradually opens the control valve corresponding to the operating mode to be switched to, including: controlling the low-pressure solenoid valve and low-pressure balance valve to close, the high-pressure balance valve to open after the fifth preset time, the high-pressure solenoid valve to open after the sixth preset time, or controlling the low-pressure electronic expansion valve to close, the high-pressure electronic expansion valve to open a certain number of steps after the seventh preset time, and the high-pressure electronic expansion valve to fully open after the eighth time.

[0084] When the operating mode to be switched to is cooling mode, the mode converter corresponding to the indoor unit to be switched to close the already opened control valve assembly and gradually open the control valve corresponding to the operating mode to be switched to, including: controlling the high pressure solenoid valve and the high pressure balance valve to close, the low pressure balance valve to open after the ninth preset time, the low pressure solenoid valve to open after the tenth preset time, or controlling the high pressure electronic expansion valve to close, the low pressure electronic expansion valve to open a certain number of steps after the eleventh preset time, and the low pressure electronic expansion valve to fully open after the twelfth time.

[0085] Among them, the first preset time is the maximum of the fifth and seventh preset times, the second preset time is the maximum of the sixth and eighth preset times, the third preset time is the maximum of the ninth and eleventh preset times, and the fourth preset time is the maximum of the tenth and twelfth preset times.

[0086] The heat recovery multi-split air conditioning system of this invention can automatically adopt the corresponding control according to the type of mode converter in the system, and when two mode converters exist in the system at the same time, it will automatically adopt the control compatible with both mode converters. That is, by adopting the mode converter control technology of this invention, the heat recovery multi-split air conditioning system can be used with different types of mode converters simultaneously, avoiding operational abnormalities caused by incorrect matching and reducing the maintenance difficulty of the heat recovery multi-split air conditioning system.

[0087] Example 3

[0088] Based on the heat recovery multi-split air conditioning system control method provided in Embodiment 2 above, in the preferred embodiment 3 of the present invention, a storage medium containing computer-executable instructions is also provided. When executed by a computer processor, the computer-executable instructions are used to execute the heat recovery multi-split air conditioning system control method as described above.

[0089] In the above embodiments, a heat recovery multi-split air conditioning system compatible with two mode converters is provided. For this heat recovery multi-split air conditioning system, a control scheme compatible with the two mode converters is automatically adopted. In particular, when the indoor units switch operating modes simultaneously, the first mode converter and the second mode converter simultaneously close the already opened control valve components and simultaneously and gradually open the control valves in the first mode converter and the second mode converter corresponding to the operating mode to be switched. The above scheme can be compatible with two mode converters at the same time, and the control of the two mode converters avoids the problem of incorrect matching between converters and control schemes, which leads to poor operating effect or abnormal noise. This improves the stability of the heat recovery multi-split air conditioning system and reduces operating noise.

[0090] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not invented by the invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0091] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A heat recovery multi-split air conditioning system, characterized in that, include: An outdoor unit (1), at least two indoor units (2), and a mode converter that corresponds one-to-one with each of the indoor units (2); The mode converter includes at least a first mode converter (3) and a second mode converter (4), both of which include a control valve assembly for controlling the refrigerant flow direction; The control valve assembly of the first mode converter (3) includes: a high-pressure solenoid valve (8), a low-pressure solenoid valve (6), a high-pressure balancing valve (7) connected in parallel with the high-pressure solenoid valve (8), and a low-pressure balancing valve (5) connected in parallel with the low-pressure solenoid valve (6); The control valve assembly of the second mode converter (4) includes: a high-pressure electronic expansion valve (10) and a low-pressure electronic expansion valve (9); When the indoor unit (2) corresponding to the first mode converter (3) and the second mode converter (4) simultaneously switches the operating mode, the first mode converter (3) and the second mode converter (4) simultaneously close the already opened control valve assembly, and simultaneously gradually open the control valve in the first mode converter (3) and the second mode converter (4) corresponding to the operating mode to be switched.

2. The heat recovery multi-split air conditioning system according to claim 1, characterized in that, When the indoor unit (2) corresponding to the first mode converter (3) and the second mode converter (4) simultaneously switches from cooling mode to heating mode, the low-pressure solenoid valve (6) and the low-pressure balance valve (5) of the first mode converter (3) are closed, and the low-pressure electronic expansion valve (9) of the second mode converter (4) is closed; after a first preset time, the high-pressure balance valve (7) of the first mode converter (3) is opened, and the high-pressure electronic expansion valve (10) of the second mode converter (4) is opened for a preset number of steps; after a second preset time, the high-pressure solenoid valve (8) of the first mode converter (3) is opened, and the high-pressure electronic expansion valve (10) of the second mode converter (4) is fully opened; When the indoor unit (2) corresponding to the first mode converter (3) and the second mode converter (4) simultaneously switches from heating mode to cooling mode, the high-pressure solenoid valve (8) and the high-pressure balance valve (7) of the first mode converter (3) are closed, and the high-pressure electronic expansion valve (10) of the second mode converter (4) is closed. After a third preset time, the low-pressure balance valve (5) of the first mode converter (3) is opened, and the low-pressure electronic expansion valve (9) of the second mode converter (4) is opened for a preset number of steps. After a fourth preset time, the low-pressure solenoid valve (6) of the first mode converter (3) is opened, and the low-pressure electronic expansion valve (9) of the second mode converter (4) is fully opened.

3. The heat recovery multi-split air conditioning system according to claim 2, characterized in that, When the indoor unit (2) corresponding to the first mode converter (3) and the second mode converter (4) does not switch operating modes at the same time, and when the indoor unit (2) corresponding to the first mode converter (3) or the second mode converter (4) switches from the cooling mode to the heating mode, the low-pressure solenoid valve (6) and the low-pressure balance valve (5) are closed, the high-pressure balance valve (7) is opened after a fifth preset time, the high-pressure solenoid valve (8) is opened after a sixth preset time, or the low-pressure electronic expansion valve (9) is closed, the high-pressure electronic expansion valve (10) is opened a certain number of steps after a seventh preset time, and the high-pressure electronic expansion valve (10) is fully opened after an eighth preset time; When the indoor unit (2) corresponding to the first mode converter (3) and the second mode converter (4) does not switch operating modes at the same time, and when the indoor unit (2) corresponding to the first mode converter (3) or the second mode converter (4) switches from the heating mode to the cooling mode, the high-pressure solenoid valve (8) and the high-pressure balance valve (7) are closed, the low-pressure balance valve (5) is opened after the ninth preset time, the low-pressure solenoid valve (6) is opened after the tenth preset time, or the high-pressure electronic expansion valve (10) is closed, the low-pressure electronic expansion valve (9) is opened a certain number of steps after the eleventh preset time, and the low-pressure electronic expansion valve (9) is fully opened after the twelfth preset time; Wherein, the first preset time is the maximum of the fifth preset time and the seventh preset time, the second preset time is the maximum of the sixth preset time and the eighth preset time, the third preset time is the maximum of the ninth preset time and the eleventh preset time, and the fourth preset time is the maximum of the tenth preset time and the twelfth preset time.

4. The heat recovery multi-split air conditioning system according to claim 1, characterized in that, Both the first mode converter (3) and the second mode converter (4) include a piping assembly, which includes a high-pressure air pipe section, a low-pressure air pipe section and an indoor unit air pipe section. The high-pressure air pipe section is connected at one end to an outdoor high-pressure air pipe and at the other end to the indoor unit air pipe section. The low-pressure air pipe section is connected at one end to an outdoor low-pressure air pipe and at the other end to the indoor unit air pipe section. The indoor unit air pipe section is also connected to an indoor air pipe. The high-pressure solenoid valve (8) is installed in the high-pressure gas pipe section of the first mode converter (3); the high-pressure balance valve (7) is connected in parallel with the high-pressure solenoid valve (8), and the flow diameter of the high-pressure balance valve (7) is smaller than that of the high-pressure solenoid valve (8); the low-pressure solenoid valve (6) is installed in the low-pressure gas pipe section of the first mode converter (3); the low-pressure balance valve (5) is connected in parallel with the low-pressure solenoid valve (6), and the flow diameter of the low-pressure balance valve (5) is smaller than that of the low-pressure solenoid valve (6); The high-pressure electronic expansion valve (10) is installed in the high-pressure gas pipe section of the second mode converter (4); the low-pressure electronic expansion valve (9) is installed in the low-pressure gas pipe section of the second mode converter (4).

5. A control method for a heat recovery multi-split air conditioning system, characterized in that, The method, applied to a heat recovery multi-split air conditioning system as described in any one of claims 1 to 4, comprises: The mode converter of the heat recovery multi-split air conditioning system is tested; Detect the operating mode of the indoor unit; The operation of the mode converter is controlled according to the operating modes of the mode converter and the indoor unit.

6. The method according to claim 5, characterized in that, Controlling the operation of the mode converter according to the operating modes of the mode converter and the indoor unit includes: When the mode converter includes a first mode converter and a second mode converter, and the indoor unit switches operating modes simultaneously, the mode converter corresponding to the indoor unit controls the control valve assembly that has been opened to close simultaneously, and gradually opens the control valves in the first mode converter and the second mode converter that correspond to the operating mode to be switched.

7. The method according to claim 6, characterized in that, When the mode converter includes a first mode converter and a second mode converter, and the indoor unit simultaneously switches from cooling mode to heating mode, the mode converter corresponding to the indoor unit is controlled to simultaneously close the already opened control valve assembly, and simultaneously gradually open the control valves in the first and second mode converters corresponding to the operating mode to be switched, including: controlling the low-pressure solenoid valve and the low-pressure balance valve of the first mode converter to close, and simultaneously closing the low-pressure electronic expansion valve of the second mode converter; after a first preset time, controlling the high-pressure balance valve of the first mode converter to open, and the high-pressure electronic expansion valve of the second mode converter to open a preset number of steps; after a second preset time, controlling the high-pressure solenoid valve of the first mode converter to open, and the high-pressure electronic expansion valve of the second mode converter to fully open; When the mode converter includes a first mode converter and a second mode converter, and the indoor unit simultaneously switches from heating mode to cooling mode, the mode converter corresponding to the indoor unit is controlled to simultaneously close the already opened control valve assembly, and simultaneously gradually open the control valves in the first and second mode converters corresponding to the operating mode to be switched, including: controlling the high-pressure solenoid valve and the high-pressure balance valve of the first mode converter to close, and simultaneously closing the high-pressure electronic expansion valve of the second mode converter; after a third preset time, controlling the low-pressure balance valve of the first mode converter to open, and the low-pressure electronic expansion valve of the second mode converter to open a preset number of steps; after a fourth preset time, controlling the low-pressure solenoid valve of the first mode converter to open, and the low-pressure electronic expansion valve of the second mode converter to fully open.

8. The method according to claim 7, characterized in that, Controlling the operation of the mode converter based on the operating modes of the mode converter and the indoor unit further includes: The mode converter includes a first mode converter and a second mode converter, and the indoor units corresponding to the first mode converter and the second mode converter do not switch operating modes at the same time; or, when the mode converter only includes the first mode converter or only the second mode converter, the mode converter corresponding to the indoor unit whose operating mode is to be switched closes the already opened control valve assembly and gradually opens the control valve corresponding to the operating mode to be switched.

9. The method according to claim 8, characterized in that, When the operating mode to be switched to is the heating mode, the mode converter corresponding to the indoor unit controlling the operating mode to be switched closes the already opened control valve assembly and gradually opens the control valve corresponding to the operating mode to be switched, including: controlling the low-pressure solenoid valve and the low-pressure balance valve to close, the high-pressure balance valve to open after a fifth preset time, the high-pressure solenoid valve to open after a sixth preset time, or controlling the low-pressure electronic expansion valve to close, the high-pressure electronic expansion valve to open a certain number of steps after a seventh preset time, and the high-pressure electronic expansion valve to fully open after an eighth preset time; When the operating mode to be switched to is the cooling mode, the mode converter corresponding to the indoor unit controlling the operating mode to be switched closes the already opened control valve assembly and gradually opens the control valve corresponding to the operating mode to be switched, including: controlling the high-pressure solenoid valve and the high-pressure balance valve to close, the low-pressure balance valve to open after a ninth preset time, the low-pressure solenoid valve to open after a tenth preset time, or controlling the high-pressure electronic expansion valve to close, the low-pressure electronic expansion valve to open a certain number of steps after an eleventh preset time, and the low-pressure electronic expansion valve to fully open after a twelfth preset time; Wherein, the first preset time is the maximum of the fifth preset time and the seventh preset time, the second preset time is the maximum of the sixth preset time and the eighth preset time, the third preset time is the maximum of the ninth preset time and the eleventh preset time, and the fourth preset time is the maximum of the tenth preset time and the twelfth preset time.

10. A storage medium containing computer-executable instructions, characterized in that, The computer-executable instructions, when executed by a computer processor, are used to perform the heat recovery multi-split air conditioning system control method as described in any one of claims 5 to 9.

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