Multi-split air conditioner

Abstract

The embodiment of the utility model provides a multi-split air conditioner, which relates to the technical field of air conditioners and is provided with an outdoor unit gas bypass and an outdoor unit liquid bypass, so that under a heating working condition, when an outdoor unit liquid pipe electromagnetic valve and an outdoor unit gas pipe electromagnetic valve are closed and a gas pipe bypass electromagnetic valve and a liquid pipe bypass electromagnetic valve are opened, the outdoor unit gas bypass and the outdoor unit gas bypass are closed; and the liquid refrigerant flows in the main air pipe, so that the piping pressure drop is reduced, and the high-low difference value calculated by the air conditioner controller according to the air conditioner parameters is more accurate.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and more specifically, to a multi-split air conditioner. Background Technology

[0002] The elevation difference is the difference in height between the outdoor and indoor units of an air conditioner relative to the ground. In practice, the elevation difference varies to accommodate different installation environments. When the outdoor unit is installed lower than the indoor unit, the user's comfort will be reduced due to pressure head differences.

[0003] In existing technologies, the height difference of the air conditioner is usually measured by construction workers during construction, or the height difference is calculated by obtaining air conditioner parameters through the controller.

[0004] However, manual measurement is inefficient and cumbersome. The controller's method of calculating the height difference does not take into account the impact of the piping pressure drop caused by the difference in the inner diameter of the main gas pipe and the main liquid pipe. The accuracy of the height difference calculated by the controller needs to be improved. Utility Model Content

[0005] The purpose of this utility model includes, for example, providing a multi-split air conditioner that can at least partially solve the above-mentioned technical problems.

[0006] The embodiments of this utility model can be implemented as follows:

[0007] In a first aspect, the present invention provides a multi-split air conditioner, the multi-split air conditioner including an outdoor unit and at least two indoor units, each indoor unit being connected to the outdoor unit via a main liquid pipe and a main gas pipe, wherein an outdoor unit liquid pipe bypass and an outdoor unit gas pipe bypass are respectively provided between the main liquid pipe and the main gas pipe.

[0008] An outdoor unit liquid pipe solenoid valve is installed on the main liquid pipe of the main liquid pipe, and an outdoor unit gas pipe solenoid valve is installed on the main gas pipe of the main gas pipe.

[0009] One end of the outdoor unit liquid pipe bypass is connected to the main gas pipe on the first side of the outdoor unit gas pipe solenoid valve, and the other end is connected to the main liquid pipe on the third side of the outdoor unit liquid pipe solenoid valve. A liquid pipe bypass solenoid valve is provided on the outdoor unit liquid pipe bypass.

[0010] One end of the outdoor unit gas pipe bypass is connected to the main gas pipe on the second side of the outdoor unit gas pipe solenoid valve, and the other end is connected to the main gas pipe on the fourth side of the outdoor unit liquid pipe solenoid valve. A gas pipe bypass solenoid valve is provided on the outdoor unit liquid pipe bypass. The first side and the second side are the two opposite sides of the outdoor unit gas pipe solenoid valve on the main gas pipe, and the third side and the fourth side are the two opposite sides of the outdoor unit liquid pipe solenoid valve on the main liquid pipe.

[0011] Optionally, the outdoor unit includes an outdoor unit heat exchanger and an outdoor unit expansion valve;

[0012] The outdoor unit heat exchanger and the outdoor unit expansion valve are installed on the main liquid pipeline of the main liquid pipe;

[0013] The outdoor unit expansion valve is located between the indoor unit and the outdoor unit heat exchanger; the outdoor unit liquid pipe solenoid valve is located on the main liquid pipe between the outdoor unit expansion valve and the indoor unit.

[0014] Optionally, the outdoor unit also includes a four-way valve;

[0015] The four-way valve is installed on the main gas pipeline of the main gas pipe, and the outdoor unit gas pipe solenoid valve is located on the main gas pipeline between the four-way valve and the indoor unit;

[0016] One end of the outdoor unit gas pipe bypass is connected to the main liquid pipeline between the outdoor unit expansion valve and the outdoor unit liquid pipe solenoid valve, and the other end is connected to the main gas pipeline between the outdoor unit gas pipe solenoid valve and the indoor unit.

[0017] One end of the outdoor unit liquid pipe bypass is connected to the main gas pipeline between the four-way valve and the outdoor unit gas pipe solenoid valve, and the other end is connected to the main liquid pipeline between the outdoor unit liquid pipe solenoid valve and the indoor unit.

[0018] Optionally, the outdoor unit further includes a compressor;

[0019] The compressor's exhaust port is connected to an exhaust pipe, which is connected to the main gas pipe via the four-way valve.

[0020] The compressor's air inlet is connected to an air inlet pipe, which is connected to the outdoor unit's heat exchanger via the four-way valve.

[0021] Optionally, the multi-split air conditioner further includes a first pressure sensor;

[0022] The first pressure sensor is installed on the main gas pipeline, located between the outdoor unit gas pipeline solenoid valve and the indoor unit;

[0023] The first pressure sensor is used to obtain the indoor unit gas pipe pressure when the multi-split air conditioner is in heating mode and the gas pipe bypass solenoid valve and the liquid pipe bypass solenoid valve are open, and the outdoor unit liquid pipe solenoid valve and the outdoor unit gas pipe solenoid valve are closed.

[0024] Optionally, the multi-split air conditioner also includes a second pressure sensor;

[0025] The second pressure sensor is mounted on the exhaust pipe, located between the compressor and the four-way valve;

[0026] The second pressure sensor is used to obtain the outdoor unit gas pipe pressure when the multi-split air conditioner is in heating mode and the gas pipe bypass solenoid valve and the liquid pipe bypass solenoid valve are open, and the outdoor unit liquid pipe solenoid valve and the outdoor unit gas pipe solenoid valve are closed.

[0027] Optionally, the indoor unit includes an indoor unit heat exchanger;

[0028] One end of the indoor unit heat exchanger is connected to the main liquid pipe, and the other end is connected to the main gas pipe.

[0029] Optionally, the indoor unit also includes an indoor unit expansion valve;

[0030] The indoor unit expansion valve is installed on the main liquid pipe, located between the indoor unit heat exchanger and the outdoor unit liquid pipe solenoid valve.

[0031] Optionally, the inner diameter of the main air pipe is twice the inner diameter of the main liquid pipe.

[0032] Optionally, the main liquid pipe and the main gas pipe are made of degreased and dephosphorized seamless copper pipes.

[0033] The beneficial effects of this utility model embodiment include, for example:

[0034] By setting up outdoor unit gas bypass and outdoor unit liquid bypass, under heating conditions, when the outdoor unit liquid pipe solenoid valve and outdoor unit gas pipe solenoid valve are closed, and the gas pipe bypass solenoid valve and liquid pipe bypass solenoid valve are open, liquid refrigerant flows in the main gas pipe, thereby reducing the piping pressure drop and making the high and low difference calculated by the air conditioner controller from the air conditioner parameters more accurate. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A schematic diagram of a multi-split air conditioner provided for an embodiment of this utility model;

[0037] Figure 2 A system structure diagram of a multi-split air conditioner provided for an embodiment of this utility model;

[0038] Figure 3A block diagram of an electronic device provided in an embodiment of this utility model;

[0039] Figure 4 A flowchart illustrating the steps of a method for detecting the height difference in a multi-split air conditioner, as provided in this embodiment of the utility model.

[0040] Icons: 01-Multi-split air conditioner; 10-Outdoor unit; 20-Indoor unit; 30-Main liquid pipe; 40-Main gas pipe; 50-Outdoor unit liquid pipe bypass; 60-Outdoor unit gas pipe bypass; 31-Outdoor unit liquid pipe solenoid valve; 41-Outdoor unit gas pipe solenoid valve; a1-First side; a2-Second side; b1-Third side; b2-Fourth side; 11-Outdoor unit heat exchanger; 12-Outdoor unit expansion valve; 13-Four-way valve; 14-Compressor; 141-Exhaust pipe; 142-Intake pipe; 70-First pressure sensor; 80-Second pressure sensor; 21-Indoor unit heat exchanger; 22-Indoor unit expansion valve; 51-Liquid pipe bypass solenoid valve; 61-Gas pipe bypass solenoid valve; 100-Electronic equipment; 110-Memory; 120-Processor; 130-Communication module. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0043] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0044] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0045] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0046] To accommodate various construction conditions, the elevation difference between the outdoor and indoor units of multi-split air conditioners varies. When this elevation difference exists, to improve cooling comfort, it's necessary to prevent the reduction in refrigerant circulation in the indoor unit due to gas-liquid mixing of the liquid refrigerant before the indoor expansion valve. However, when the outdoor unit is located at the lower level, the pressure of the liquid refrigerant before the indoor expansion valve decreases due to the presence of a pressure head, resulting in a lower condensation temperature and gas-liquid mixing of the liquid refrigerant. Therefore, subcooling control of the liquid refrigerant under elevation differences needs to be considered.

[0047] During oil return operation, an appropriate operating frequency needs to be selected to prevent insufficient oil in the compressor. However, as the elevation difference increases, the amount of oil retained in the vertical pipe also increases. Therefore, when the elevation difference is unknown, the frequency of oil return operation needs to be increased to cope with the maximum elevation difference of the air conditioner. However, frequent oil return operation can lead to a decrease in comfort. Therefore, after the air conditioner is installed, the elevation difference needs to be determined to improve the user's comfort when using the air conditioner.

[0048] In existing solutions, construction workers typically measure the height difference of the air conditioner during construction and manually input this value into the air conditioner unit. This method is inefficient and cumbersome.

[0049] In another approach, a pressure sensor can be installed on the indoor unit side of the liquid pipe connecting the outdoor and indoor units (hereinafter referred to as the main liquid pipe). When the air conditioner is under test, the pressure difference of the main liquid pipe is calculated based on the exhaust pressure and the indoor unit liquid pipe pressure during cooling operation, thus estimating the height difference. However, during cooling operation, due to pipe pressure loss, the pressure of the downstream indoor unit liquid pipe decreases, and both the pressure head and piping pressure loss will change. Therefore, the final measured height difference is not accurate enough.

[0050] Based on the above, this utility model provides a multi-split air conditioner 01, which can effectively alleviate the above-mentioned technical problems.

[0051] Please see Figure 2 This utility model provides a multi-split air conditioner 01, which includes an outdoor unit 10 and at least two indoor units 20. Each indoor unit 20 is connected to the outdoor unit 10 through a main liquid pipe 30 and a main gas pipe 40. An outdoor unit liquid pipe bypass 50 and an outdoor unit gas pipe bypass 60 are respectively provided between the main liquid pipe 30 and the main gas pipe 40.

[0052] An outdoor unit liquid pipe solenoid valve 31 is installed on the main liquid pipe 30, and an outdoor unit gas pipe solenoid valve 41 is installed on the main gas pipe 40.

[0053] One end of the outdoor unit liquid pipe bypass 50 is connected to the main air pipe 40 on the first side a1 of the outdoor unit air pipe solenoid valve 41, and the other end is connected to the main liquid pipe 30 on the third side b1 of the outdoor unit liquid pipe solenoid valve 31. The outdoor unit liquid pipe bypass 50 is equipped with a liquid pipe bypass solenoid valve 51.

[0054] One end of the outdoor unit gas pipe bypass 60 is connected to the main gas pipe 40 on the second side a2 of the outdoor unit gas pipe solenoid valve 41, and the other end is connected to the main gas pipe 40 on the fourth side b2 of the outdoor unit liquid pipe solenoid valve 31. A gas pipe bypass solenoid valve 61 is installed on the outdoor unit liquid pipe bypass 50. Among them, the first side a1 and the second side a2 are the two opposite sides of the outdoor unit gas pipe solenoid valve 41 on the main gas pipe 40, and the third side b1 and the fourth side b2 are the two opposite sides of the outdoor unit liquid pipe solenoid valve 31 on the main liquid pipe 30.

[0055] Under normal circumstances, when the multi-split air conditioner 01 is in heating mode, the high-pressure gaseous refrigerant is discharged from the outdoor unit 10, flows into the indoor unit 20 through the main gas pipe 40, and after being condensed in the indoor unit 20, the liquid refrigerant flows out from the indoor unit 20 and flows back to the outdoor unit 10 through the main liquid pipe 30.

[0056] In the solution of this utility model embodiment, such as Figure 1 As shown, an outdoor unit gas pipe solenoid valve 41 is installed on the main gas pipe 40, an outdoor unit liquid pipe solenoid valve 31 is installed on the main liquid pipe 30, an outdoor unit gas pipe bypass 60 leading to the main liquid pipe 30 is installed on the main gas pipe 40 of the main gas pipe 40, an outdoor unit liquid pipe bypass 50 leading to the main gas pipe 40 is installed on the main liquid pipe 30 of the main liquid pipe 30, a liquid pipe bypass solenoid valve 51 is installed on the outdoor unit liquid pipe bypass 50, and a gas pipe bypass solenoid valve 61 is installed on the outdoor unit gas pipe bypass 60.

[0057] With the above settings, when the multi-split air conditioner 01 is in heating mode, if the outdoor unit liquid pipe solenoid valve 31 and the outdoor unit gas pipe solenoid valve 41 are closed, and the liquid pipe bypass solenoid valve 51 and the gas pipe bypass solenoid valve 61 are opened, then when the high-pressure gaseous refrigerant is discharged from the outdoor unit 10, the high-pressure gaseous refrigerant will enter the main liquid pipe 30 through the outdoor unit liquid pipe bypass 50 and flow into the indoor unit 20. The liquid refrigerant, after being condensed in the indoor unit 20, flows out of the indoor unit 20 into the main gas pipe 40, and when it reaches the outdoor unit gas pipe bypass 60, it flows back into the main liquid pipe 30 through the outdoor unit gas pipe bypass 60, and finally returns to the outdoor unit 10.

[0058] Since the inner diameter of the main gas pipe 40 is generally about twice as large as the inner diameter of the main liquid pipe 30, the refrigerant flow rate, which is inversely proportional to the cross-sectional area of ​​the piping, is about 1 / 4.

[0059] According to the formula

[0060] △P=λ×L / d×ρ×V 2 / 2×10-5

[0061] Where ΔP is the pipe pressure drop (bar), λ is the pipe friction coefficient, L is the pipe length (m), d is the pipe inner diameter (m), ρ is the refrigerant density (kg / m3), and V is the refrigerant velocity (m / s).

[0062] It can be seen that when the inner diameter of the piping is doubled and the refrigerant flow rate is reduced to 1 / 4, the pressure drop in the piping will decrease significantly to 1 / 32. Therefore, when calculating the pressure head based on the pressure change of the liquid refrigerant in the vertical piping, the error caused by the pressure drop in the piping will increase significantly.

[0063] In this embodiment of the utility model, since the liquid refrigerant between the outdoor unit 10 and the indoor unit 20 does not flow in the main liquid pipe 30, but in the main gas pipe 40, the situation of increased pipe pressure drop due to different pipe inner diameters, which leads to increased pressure head calculation error, can be avoided.

[0064] Optionally, the outdoor unit 10 includes an outdoor unit heat exchanger 11 and an outdoor unit expansion valve 12.

[0065] The outdoor unit heat exchanger 11 and the outdoor unit expansion valve 12 are installed on the main liquid pipe 30.

[0066] The outdoor unit expansion valve 12 is located between the indoor unit 20 and the outdoor unit heat exchanger 11. The outdoor unit liquid pipe solenoid valve 31 is located on the main liquid pipe 30 between the outdoor unit expansion valve 12 and the indoor unit 20.

[0067] Please see Figure 2 Both the outdoor unit heat exchanger 11 and the outdoor unit expansion valve 12 are located on the main liquid pipe 30. When the liquid refrigerant flows from the main gas pipe 40 through the outdoor unit gas pipe bypass 60, it flows through the outdoor unit expansion valve 12 and reaches the outdoor unit heat exchanger 11. Through the evaporation of the outdoor unit heat exchanger 11, the liquid refrigerant is converted into low-pressure gaseous refrigerant.

[0068] Optionally, the outdoor unit 10 also includes a four-way valve 13. The four-way valve 13 is located on the main gas pipe 40, and the outdoor unit gas pipe solenoid valve 41 is located on the main gas pipe 40 between the four-way valve 13 and the indoor unit 20.

[0069] One end of the outdoor unit gas pipe bypass 60 is connected to the main liquid pipe 30 between the outdoor unit expansion valve 12 and the outdoor unit liquid pipe solenoid valve 31, and the other end is connected to the main gas pipe 40 between the outdoor unit gas pipe solenoid valve 41 and the indoor unit 20.

[0070] One end of the outdoor unit liquid pipe bypass 50 is connected to the main air pipe 40 between the four-way valve 13 and the outdoor unit air pipe solenoid valve 41, and the other end is connected to the main liquid pipe 30 between the outdoor unit liquid pipe solenoid valve 31 and the indoor unit 20.

[0071] The outdoor unit 10 of the multi-split air conditioner 01 also includes a four-way valve 13. The four-way valve 13 is installed on the main gas pipe 40. By flexibly switching the refrigerant flow direction, the four-way valve 13 enables the air conditioning system to operate efficiently in cooling and heating modes according to the ambient temperature and user needs, avoiding the use of additional heating or cooling equipment and improving energy utilization efficiency.

[0072] Optionally, the outdoor unit 10 also includes a compressor 14. The exhaust port of the compressor 14 is connected to an exhaust pipe 141, which is connected to the main gas pipe 40 via a four-way valve 13.

[0073] The compressor 14 has an intake pipe 142 connected to its intake port, and the intake pipe 142 is connected to the outdoor unit heat exchanger 11 through a four-way valve 13.

[0074] like Figure 2 As shown, the exhaust port of compressor 14 is connected to the main gas pipe 40 through exhaust pipe 141 and four-way valve 13, and the intake port is connected to outdoor unit heat exchanger 11 through intake pipe 142 and four-way valve 13. In heating mode, after the liquid refrigerant evaporates into low-pressure gaseous refrigerant through outdoor unit heat exchanger 11, it is converted back into high-pressure gaseous refrigerant by compressor 14.

[0075] Optionally, the multi-split air conditioner 01 also includes a first pressure sensor 70. The first pressure sensor 70 is located on the main gas pipe 40, between the outdoor unit gas pipe solenoid valve 41 and the indoor unit 20.

[0076] The first pressure sensor 70 is used to obtain the gas pipe pressure of the indoor unit 20 when the multi-split air conditioner 01 is in heating mode and the gas pipe bypass solenoid valve 61 and liquid pipe bypass solenoid valve 51 are open, while the outdoor unit liquid pipe solenoid valve 31 and outdoor unit gas pipe solenoid valve 41 are closed.

[0077] The first pressure sensor 70 is located at the inlet of the main gas pipe 40 leading to the indoor unit 20. In this embodiment of the invention, calculating the height difference requires obtaining the gas pipe pressure of the indoor unit 20 and the gas pipe pressure of the outdoor unit 10. The first pressure sensor 70 can be used to obtain the gas pipe pressure of the indoor unit 20 when the multi-split air conditioner 01 is in heating mode and the gas pipe bypass solenoid valve 61 and the liquid pipe bypass solenoid valve 51 are open, while the outdoor unit liquid pipe solenoid valve 31 and the outdoor unit gas pipe solenoid valve 41 are closed.

[0078] Optionally, the multi-split air conditioner 01 also includes a second pressure sensor 80. The second pressure sensor 80 is disposed on the exhaust pipe 141, located between the compressor 14 and the four-way valve 13.

[0079] The second pressure sensor 80 is used to obtain the gas pipe pressure of the outdoor unit 10 when the multi-split air conditioner 01 is in heating mode and the gas pipe bypass solenoid valve 61 and the liquid pipe bypass solenoid valve 51 are open, while the outdoor unit liquid pipe solenoid valve 31 and the outdoor unit gas pipe solenoid valve 41 are closed.

[0080] The second pressure sensor 80 is installed on the exhaust pipe 141 of the compressor 14. In this embodiment of the present invention, the second pressure sensor 80 can be used to obtain the gas pipe pressure of the outdoor unit 10 when the multi-split air conditioner 01 is in heating mode and the gas pipe bypass solenoid valve 61 and the liquid pipe bypass solenoid valve 51 are open, while the outdoor unit liquid pipe solenoid valve 31 and the outdoor unit gas pipe solenoid valve 41 are closed.

[0081] Optionally, the indoor unit 20 includes an indoor unit heat exchanger 21. One end of the indoor unit heat exchanger 21 is connected to the main liquid pipe 30, and the other end is connected to the main gas pipe 40.

[0082] Optionally, the indoor unit 20 also includes an indoor unit expansion valve 22. The indoor unit expansion valve 22 is disposed on the main liquid pipe 30, located between the indoor unit heat exchanger 21 and the outdoor unit liquid pipe solenoid valve 31.

[0083] In this embodiment of the present invention, when the high-pressure gaseous refrigerant flows to each indoor unit 20 through the main liquid pipe 30 under heating conditions, it first passes through the indoor unit expansion valve 22, and then enters the indoor unit heat exchanger 21. The indoor unit heat exchanger 21 condenses the high-pressure gaseous refrigerant into liquid refrigerant, and then the liquid refrigerant flows out from the indoor unit heat exchanger 21 and flows into the main gas pipe 40.

[0084] Optionally, the inner diameter of the main air tube 40 is twice the inner diameter of the main liquid tube 30.

[0085] Because liquid refrigerant has a high density and small volume, the main liquid pipe 30 can be designed to be thinner to reduce costs and save space. The flow rate must be controlled within a reasonable range to balance pressure loss and oil carrying capacity. In contrast, gaseous refrigerant has a low density and large volume, so the main gas pipe 40 requires a larger flow area. Its flow rate must be conducive to the return of lubricating oil to the compressor. If the pipe diameter is too small, it will increase pressure loss, affect system efficiency, and even make it difficult for the compressor 14 to return oil.

[0086] Therefore, in this embodiment of the present invention, the inner diameter of the main air pipe 40 can be set to twice the inner diameter of the main liquid pipe 30.

[0087] Optionally, the main liquid pipe 30 and the main gas pipe 40 are made of degreased and dephosphorized seamless copper pipes.

[0088] Degreased and dephosphorized seamless copper pipes (R410A dedicated seamless copper pipes) possess excellent thermal conductivity and corrosion resistance, enabling rapid and efficient heat transfer. This ensures efficient heat exchange of the refrigerant as it flows through the pipes, thereby improving the cooling or heating efficiency of the air conditioning system. Furthermore, they maintain the integrity and stability of the pipes during long-term operation, reducing pipe leaks caused by corrosion and extending the system's lifespan. In addition, degreased and dephosphorized seamless copper pipes also have excellent sealing properties. When connected by welding or other methods, they form a reliable sealing structure, effectively preventing refrigerant leakage and ensuring the normal operation and cooling effect of the air conditioning system.

[0089] Please refer to Figure 3 This is a block diagram of an electronic device 100 provided by this utility model. The electronic device 100 can be a device capable of data processing, and this embodiment does not limit this. The electronic device 100 includes a memory 110, a processor 120, and a communication module 130. The memory 110, processor 120, and communication module 130 are electrically connected directly or indirectly to achieve data transmission or interaction. For example, these components can be electrically connected to each other through one or more communication buses or signal lines.

[0090] The memory 110 is used to store programs or data. The memory 110 may be, but is not limited to, random access memory (RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), etc.

[0091] The processor 120 is used to read / write data or programs stored in memory and to perform corresponding functions.

[0092] The communication module 130 is used to establish a communication connection between the server and other communication terminals via the network, and to send and receive data via the network.

[0093] It should be understood that, Figure 3 The structure shown is only a schematic diagram of the electronic device 100. The electronic device 100 may also include components that are larger than... Figure 3 The more or fewer components shown, or having the same Figure 3Different configurations are shown, such as electronic device 100 may also include multiple pressure sensors, etc. Figure 3 The components shown can be implemented using hardware, software, or a combination thereof. The electronic device 100 can be installed in other devices (such as in a multi-split air conditioner) or as a stand-alone device.

[0094] Corresponding to electronic device 100, this utility model embodiment provides a method for detecting the height difference of a multi-split air conditioner, which can be applied to the multi-split air conditioner 01 mentioned above. The method includes, as follows: Figure 4 The following steps are shown:

[0095] Step S110: Control the multi-split air conditioner 01 to operate in heating mode, and control the gas pipe bypass solenoid valve 61 and liquid pipe bypass solenoid valve 51 to open, the outdoor unit liquid pipe solenoid valve 31 and the outdoor unit gas pipe solenoid valve 41 to close, and control the indoor unit expansion valve 22 to open to the maximum degree.

[0096] Step S120: Obtain the air pipe pressure of the indoor unit 20 and the air pipe pressure of the outdoor unit 10 through the first pressure sensor 70 and the second pressure sensor 80 respectively.

[0097] Step S130: Based on the pressure head calculation formula, determine the pressure head according to the gas pipe pressure of indoor unit 20 and outdoor unit 10.

[0098] Step S140: Based on the height difference calculation formula, determine the height difference of the multi-split air conditioner 01 according to the pressure head.

[0099] The controller first controls the multi-split air conditioner 01 to operate in heating mode. Simultaneously, it controls the opening of the gas pipe bypass solenoid valve 61 and the liquid pipe bypass solenoid valve 51, the closing of the outdoor unit liquid pipe solenoid valve 31 and the outdoor unit gas pipe solenoid valve 41, and the opening of the indoor unit expansion valve 22 to its maximum degree. After the multi-split air conditioner 01 has been running for a set period, the controller obtains the gas pipe pressure of the indoor unit 20 and the outdoor unit 10 through the first pressure sensor 70 and the second pressure sensor 80, respectively. The obtained gas pipe pressures of the indoor unit 20 and the outdoor unit 10 are substituted into the pressure head calculation formula to determine the pressure head of the multi-split air conditioner 01. Then, the pressure head is substituted into the height difference calculation formula to obtain the height difference of the multi-split air conditioner 01.

[0100] Optionally, the formula for calculating pressure head is:

[0101] △P=P LOU -P LIU =P d -P LIU

[0102] Among them, P LOUThe outdoor unit's gas pipe pressure is P. LIU For the indoor unit's 20 gas pipe pressure, P d The exhaust pressure is ΔP, and the pressure head is ΔP.

[0103] The formula for calculating elevation difference is:

[0104] h=△P / (ρ×10 -4 )

[0105] Where h is the height difference and ρ is the density of the liquid refrigerant.

[0106] Assuming the pressure in the outdoor unit's No. 10 gas pipe is equal to the exhaust pressure, the exhaust pressure can be considered the pressure in the outdoor unit's No. 10 gas pipe. The liquid refrigerant density is calculated using a general approximation formula based on the liquid refrigerant pressure. Since the change in liquid refrigerant density due to pressure is small, the exhaust pressure can also be used as the liquid refrigerant pressure. Then, the height difference is calculated using the pressure head and liquid refrigerant density formula.

[0107] Based on the same inventive concept, the embodiments of this utility model specification provide a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of any of the methods in the aforementioned method for detecting the height difference of multi-split air conditioners.

[0108] This utility model has at least the following beneficial effects:

[0109] By setting up outdoor unit gas bypass and outdoor unit liquid bypass, under heating conditions, when the outdoor unit liquid pipe solenoid valve and outdoor unit gas pipe solenoid valve are closed, and the gas pipe bypass solenoid valve and liquid pipe bypass solenoid valve are open, liquid refrigerant flows in the main gas pipe, thereby reducing the piping pressure drop and making the high and low difference calculated by the air conditioner controller from the air conditioner parameters more accurate.

[0110] In the several embodiments provided by this utility model, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the architecture, functions, and operations of possible implementations of apparatus, methods, and computer program products according to various embodiments of this utility model. In this regard, each block in a flowchart or block diagram may represent a module, segment, or part of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0111] In addition, the functional modules in the various embodiments of this utility model can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0112] If the functionality is implemented as a software module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this utility model, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this utility model. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0113] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A multi-split air conditioner, characterized in that, The multi-split air conditioner (01) includes an outdoor unit (10) and at least two indoor units (20). Each indoor unit (20) is connected to the outdoor unit (10) through a main liquid pipe (30) and a main gas pipe (40). An outdoor unit liquid pipe bypass (50) and an outdoor unit gas pipe bypass (60) are respectively provided between the main liquid pipe (30) and the main gas pipe (40). An outdoor unit liquid pipe solenoid valve (31) is installed on the main liquid pipe (30) of the main liquid pipe (30), and an outdoor unit gas pipe solenoid valve (41) is installed on the main gas pipe (40) of the main gas pipe (40). One end of the outdoor unit liquid pipe bypass (50) is connected to the main air pipe (40) of the first side (a1) of the outdoor unit air pipe solenoid valve (41), and the other end is connected to the main liquid pipe (30) of the third side (b1) of the outdoor unit liquid pipe solenoid valve (31). A liquid pipe bypass solenoid valve (51) is provided on the outdoor unit liquid pipe bypass (50). One end of the outdoor unit air pipe bypass (60) is connected to the main air pipe (40) of the second side (a2) of the outdoor unit air pipe solenoid valve (41), and the other end is connected to the main air pipe (40) of the fourth side (b2) of the outdoor unit liquid pipe solenoid valve (31). An air pipe bypass solenoid valve (61) is provided on the outdoor unit liquid pipe bypass (50). The first side (a1) and the second side (a2) are the opposite sides of the outdoor unit air pipe solenoid valve (41) on the main air pipe (40), and the third side (b1) and the fourth side (b2) are the opposite sides of the outdoor unit liquid pipe solenoid valve (31) on the main liquid pipe (30).

2. The multi-split air conditioner as described in claim 1, characterized in that, The outdoor unit (10) includes an outdoor unit heat exchanger (11) and an outdoor unit expansion valve (12); The outdoor unit heat exchanger (11) and the outdoor unit expansion valve (12) are installed on the main liquid pipe (30) of the main liquid pipe (30); The outdoor unit expansion valve (12) is located between the indoor unit (20) and the outdoor unit heat exchanger (11); the outdoor unit liquid pipe solenoid valve (31) is located on the main liquid pipe (30) between the outdoor unit expansion valve (12) and the indoor unit (20).

3. The multi-split air conditioner as described in claim 2, characterized in that, The outdoor unit (10) also includes a four-way valve (13); The four-way valve (13) is installed on the main gas pipe (40) of the main gas pipe (40), and the outdoor unit gas pipe solenoid valve (41) is located on the main gas pipe (40) between the four-way valve (13) and the indoor unit (20); One end of the outdoor unit gas pipe bypass (60) is connected to the main liquid pipe (30) between the outdoor unit expansion valve (12) and the outdoor unit liquid pipe solenoid valve (31), and the other end is connected to the main gas pipe (40) between the outdoor unit gas pipe solenoid valve (41) and the indoor unit (20). One end of the outdoor unit liquid pipe bypass (50) is connected to the main air pipe (40) between the four-way valve (13) and the outdoor unit air pipe solenoid valve (41), and the other end is connected to the main liquid pipe (30) between the outdoor unit liquid pipe solenoid valve (31) and the indoor unit (20).

4. The multi-split air conditioner as described in claim 3, characterized in that, The outdoor unit (10) also includes a compressor (14); The compressor (14) has an exhaust pipe (141) connected to its exhaust port, and the exhaust pipe (141) is connected to the main air pipe (40) through the four-way valve (13). The compressor (14) has an air inlet connected to an air inlet pipe (142), which is connected to the outdoor unit heat exchanger (11) via the four-way valve (13).

5. The multi-split air conditioner as described in claim 4, characterized in that, The multi-split air conditioner (01) also includes a first pressure sensor (70); The first pressure sensor (70) is installed on the main gas pipe (40) and located between the outdoor unit gas pipe solenoid valve (41) and the indoor unit (20); The first pressure sensor (70) is used to obtain the gas pipe pressure of the indoor unit (20) when the multi-split air conditioner (01) is in heating mode and the gas pipe bypass solenoid valve (61) and the liquid pipe bypass solenoid valve (51) are open, and the outdoor unit liquid pipe solenoid valve (31) and the outdoor unit gas pipe solenoid valve (41) are closed.

6. The multi-split air conditioner as described in claim 5, characterized in that, The multi-split air conditioner (01) also includes a second pressure sensor (80); The second pressure sensor (80) is disposed on the exhaust pipe (141) and located between the compressor (14) and the four-way valve (13); The second pressure sensor (80) is used to obtain the gas pipe pressure of the outdoor unit (10) when the multi-split air conditioner (01) is in heating mode and the gas pipe bypass solenoid valve (61) and the liquid pipe bypass solenoid valve (51) are open, and the outdoor unit liquid pipe solenoid valve (31) and the outdoor unit gas pipe solenoid valve (41) are closed.

7. The multi-split air conditioner as described in claim 1, characterized in that, The indoor unit (20) includes an indoor unit heat exchanger (21); One end of the indoor unit heat exchanger (21) is connected to the main liquid pipe (30), and the other end is connected to the main gas pipe (40).

8. The multi-split air conditioner as described in claim 7, characterized in that, The indoor unit (20) also includes an indoor unit expansion valve (22); The indoor unit expansion valve (22) is installed on the main liquid pipe (30) and is located between the indoor unit heat exchanger (21) and the outdoor unit liquid pipe solenoid valve (31).

9. The multi-split air conditioner as described in any one of claims 1 to 8, characterized in that, The inner diameter of the main air pipe (40) is twice the inner diameter of the main liquid pipe (30).

10. The multi-split air conditioner as described in claim 1, characterized in that, The main liquid pipe (30) and the main gas pipe (40) are made of degreased and dephosphorized seamless copper pipes.

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