Multi-position air conditioner parallel system

Abstract

The utility model discloses a multi-position air-conditioning parallel system, which belongs to the technical field of air-conditioning systems, and comprises at least one indoor unit and at least two outdoor units, and the indoor unit comprises a primary liquid pipe, a primary low-pressure air pipe and a primary high-pressure air pipe; the outdoor unit comprises secondary liquid pipes, a secondary low-pressure air pipe and a secondary high-pressure air pipe; all the secondary liquid pipes are communicated with all the primary liquid pipes; all the secondary low-pressure air pipes are communicated with all the primary low-pressure air pipes; and all the secondary high-pressure air pipes are communicated with all the primary high-pressure air pipes. According to the multi-position air conditioner parallel system, the problem that the indoor temperature is affected due to the fact that outdoor units can only conduct unified defrosting in an existing air conditioner system is solved, the effect of keeping the indoor temperature on the basis that the indoor units do not stop in the defrosting process is achieved, and the comfort of the indoor environment is effectively guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of air-conditioning systems, and in particular relates to a multi-position air-conditioning parallel system. Background Art

[0002] In real life, due to the large indoor space, multiple indoor units are often required to meet the required cooling or heating requirements. However, in the existing air-conditioning system formed by multiple indoor units connected in series, the connected outdoor units cannot be defrosted individually. When all outdoor units enter the defrost state at the same time, all indoor units must be shut down, so that the indoor units can no longer cool or heat the indoor space, which in turn causes the temperature of the indoor space to fluctuate, affecting the comfort of the indoor environment.

[0003] Therefore, the existing technology needs to be improved and developed. Utility Model Content

[0004] The purpose of the utility model is to provide a multi-unit air-conditioning parallel system, which solves the problem in the existing air-conditioning system that the indoor temperature is affected by the fact that the outdoor units can only defrost uniformly, and achieves the effect of maintaining the indoor temperature without stopping the indoor units during the defrosting process, effectively ensuring the comfort of the indoor environment.

[0005] In a first aspect, the present invention provides a multi-unit air-conditioning parallel system, comprising at least one indoor unit, wherein the indoor unit comprises a first-level liquid pipe, a first-level low-pressure gas pipe, and a first-level high-pressure gas pipe;

[0006] The multi-unit air-conditioning parallel system further includes:

[0007] At least two outdoor units, each of which includes a secondary liquid pipe, a secondary low-pressure air pipe, and a secondary high-pressure air pipe. All of the secondary liquid pipes are connected to all of the primary liquid pipes; all of the secondary low-pressure air pipes are connected to all of the primary low-pressure air pipes; and all of the secondary high-pressure air pipes are connected to all of the primary high-pressure air pipes.

[0008] The multi-unit air-conditioning parallel system provided by the utility model connects all the parallel outdoor units with all the indoor units, thereby enabling a single outdoor unit to control multiple indoor units, and further allowing some of the outdoor units to be defrosted separately, achieving non-stop defrosting while controlling the operating energy of the outdoor units. It can also maintain the indoor temperature during the defrosting process, thereby ensuring the comfort of the indoor environment.

[0009] Furthermore, the outdoor unit further includes an outdoor unit heat exchanger, a main electronic expansion valve, a refrigerant heat sink, an economizer, an auxiliary electronic expansion valve, a first four-way valve, a second four-way valve, a compressor, an oil separator, an unloading valve, a quick oil return valve, a gas-liquid separator and a liquid spray cooling valve;

[0010] The first end of the secondary liquid pipe is connected to the second end of the refrigerant heat sink through the economizer, the first end of the refrigerant heat sink is connected to the second end of the main electronic expansion valve, the first end of the main electronic expansion valve is connected to the second end of the outdoor unit heat exchanger, and the first end of the outdoor unit heat exchanger is connected to the fourth end of the first four-way valve.

[0011] The first end of the secondary liquid pipe is also connected to the second end of the auxiliary electronic expansion valve, and the first end of the auxiliary electronic expansion valve is connected to the air supply port of the compressor through the economizer;

[0012] The first end of the secondary liquid pipe is also connected to the first end of the first four-way valve, the second end of the first four-way valve, the fourth end of the second four-way valve, the first end of the second four-way valve, the inlet of the gas-liquid separator, the first end of the secondary low-pressure gas pipe and the second end of the unloading valve; the third end of the first four-way valve is connected to the third end of the second four-way valve; and the second end of the second four-way valve is connected to the secondary high-pressure gas pipe.

[0013] The first end of the secondary liquid pipe is also connected to the second end of the liquid spray cooling valve, and the first end of the liquid spray cooling valve is simultaneously connected to the outlet of the gas-liquid separator, the second end of the quick oil return valve, the return air port of the compressor and the second oil outlet of the oil separator, the exhaust port of the compressor is connected to the oil and gas inlet of the oil separator, the air outlet of the oil separator is simultaneously connected to the third end of the first four-way valve, the third end of the second four-way valve and the first end of the unloading valve, and the first oil outlet of the oil separator is connected to the first end of the quick oil return valve.

[0014] Any outdoor unit can independently control the refrigerant phase of all outdoor units, thereby controlling the outdoor units to perform cooling, heating and defrosting.

[0015] Furthermore, the outdoor unit also includes a liquid-sensing bypass solenoid valve and a quick defrost valve, and the liquid-sensing bypass solenoid valve is connected in parallel to the main electronic expansion valve; the second end of the quick defrost valve is connected to the first end of the secondary liquid pipe, and the first end of the quick defrost valve is simultaneously connected to the first end of the first four-way valve, the second end of the first four-way valve, the fourth end of the second four-way valve, the first end of the second four-way valve, the inlet of the gas-liquid separator, the first end of the secondary low-pressure gas pipe and the second end of the unloading valve.

[0016] The control liquid bypass solenoid valve and the fast defrost valve are opened at the same time, thereby speeding up the defrosting speed of the corresponding outdoor unit.

[0017] Furthermore, a low-pressure pressure sensor and a low-pressure pressure switch are arranged between the second end of the quick oil return valve and the first end of the liquid spray cooling valve. The low-pressure pressure sensor is connected to the low-pressure pressure switch and is used to measure pressure as control information of the low-pressure pressure switch.

[0018] Keeping the low-pressure gas phase refrigerant in a controllable state is beneficial to improving the overall reliability and stability of the system.

[0019] Furthermore, a high-pressure pressure sensor and a high-pressure pressure switch are provided between the exhaust port of the compressor and the oil and gas inlet of the oil separator. The high-pressure pressure sensor is connected to the high-pressure pressure switch and is used to measure pressure as control information of the high-pressure pressure switch.

[0020] Furthermore, a protection switch is provided between the exhaust port of the compressor and the oil and gas inlet of the oil separator.

[0021] Furthermore, a first temperature sensor is provided between the economizer and the first end of the auxiliary electronic expansion valve, and a second temperature sensor is provided between the economizer and the air supply port of the compressor.

[0022] Furthermore, a third temperature sensor is provided between the economizer and the second end of the refrigerant heat sink;

[0023] A fourth temperature sensor is provided between the first end of the main electronic expansion valve and the second end of the outdoor heat exchanger;

[0024] A fifth temperature sensor is provided between the second end of the rapid oil return valve and the first end of the liquid spray cooling valve.

[0025] Furthermore, the indoor unit further comprises an indoor unit electronic expansion valve, an indoor unit heat exchanger, a first solenoid valve and a second solenoid valve;

[0026] The first-level liquid pipe is simultaneously connected to the second ends of all the second-level liquid pipes and the first ends of all the indoor unit electronic expansion valves, the second ends of the indoor unit electronic expansion valves are connected to the first end of the indoor unit heat exchanger, and the second ends of the indoor unit heat exchangers are simultaneously connected to the second ends of the first solenoid valve and the second ends of the second solenoid valve.

[0027] The first-level low-pressure air pipe is simultaneously connected to the second ends of all the second-level low-pressure air pipes and the first end of the second solenoid valve;

[0028] The first-level high-pressure gas pipe is simultaneously connected to the second ends of all the second-level high-pressure gas pipes and the first end of the first solenoid valve.

[0029] Furthermore, a sixth temperature sensor is provided between the second end of the indoor unit heat exchanger and the second end of the first solenoid valve and the second end of the second solenoid valve.

[0030] From the above, it can be seen that the multi-unit air-conditioning parallel system of the present invention connects at least two outdoor units in parallel to all indoor units at the same time, so that any outdoor unit can control all indoor units, which is conducive to controlling the defrosting of some outdoor units while controlling the remaining outdoor units to maintain normal working conditions, thereby achieving the effect of non-stop defrosting; further, the outdoor units in the non-defrosting state can make up for the missing operating energy demand, thereby achieving the effect of maintaining the indoor temperature, and effectively avoiding the comfort of the indoor environment affected by the defrosting of the outdoor units.

[0031] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the embodiments of the present invention. The purposes and other advantages of the present invention can be achieved and obtained by the structures particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The present invention provides a schematic structural diagram of a multi-unit air-conditioning parallel system.

[0033] Figure 2 Schematic diagram of the structure of the outdoor unit in the embodiment of the present utility model.

[0034] Figure 3 Schematic diagram of the structure of the indoor unit in the embodiment of the present utility model.

[0035] Description of labels:

[0036] 100, indoor unit; 110, first-level liquid pipe; 120, first-level low-pressure gas pipe; 130, first-level high-pressure gas pipe; 200, outdoor unit; 210, second-level liquid pipe; 220, second-level low-pressure gas pipe; 230, second-level high-pressure gas pipe; 1, outdoor unit heat exchanger; 2, main electronic expansion valve; 3, refrigerant heat sink; 4, economizer; 5, auxiliary electronic expansion valve; 6, first four-way valve; 7, second four-way valve; 8, compressor; 9, oil separator; 10, unloading valve; 11, quick oil return valve; 12, gas-liquid separator; 13, liquid spray cooling valve; 14, liquid test bypass solenoid valve; 15, quick defrost valve; 1 6. Indoor unit electronic expansion valve; 17. Indoor unit heat exchanger; 18. First solenoid valve; 19. Second solenoid valve; 310. Low-pressure pressure sensor; 320. Low-pressure pressure switch; 410. High-pressure pressure sensor; 420. High-pressure pressure switch; 500. Protection switch; T1. First temperature sensor; T2. Second temperature sensor; T3. Third temperature sensor; T4. Fourth temperature sensor; T5. Fifth temperature sensor; T6. Sixth temperature sensor; T7. Seventh temperature sensor; T8. Eighth temperature sensor; T9. Ninth temperature sensor; T10. Tenth temperature sensor. DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0039] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or mutual communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0040] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0041] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but a person of ordinary skill in the art will recognize the application of other processes and / or the use of other materials.

[0042] Reference Attachment Figure 1 The present invention provides a multi-unit air conditioner parallel system, comprising at least one indoor unit 100, wherein the indoor unit 100 comprises a first-level liquid pipe 110, a first-level low-pressure gas pipe 120, and a first-level high-pressure gas pipe 130; the multi-unit air conditioner parallel system further comprises:

[0043] At least two outdoor units 200, the outdoor unit 200 includes a secondary liquid pipe 210, a secondary low-pressure gas pipe 220 and a secondary high-pressure gas pipe 230, all secondary liquid pipes 210 are connected to all primary liquid pipes 110; all secondary low-pressure gas pipes 220 are connected to all primary low-pressure gas pipes 120; all secondary high-pressure gas pipes 230 are connected to all primary high-pressure gas pipes 130.

[0044] In this embodiment, the indoor unit 100 is composed of a first-level liquid pipe 110, a first-level low-pressure gas pipe 120 and a first-level high-pressure gas pipe 130 to form a three-pipe structure, and all indoor units 100 are connected in parallel; the outdoor unit 200 is composed of a second-level liquid pipe 210, a second-level low-pressure gas pipe 220 and a second-level high-pressure gas pipe 230 to form a three-pipe structure, and all outdoor units 200 are connected in parallel; the second-level liquid pipe 210 of all outdoor units 200 is connected to the first-level liquid pipe 110, the second-level low-pressure gas pipe 220 is connected to the first-level low-pressure gas pipe 120, and the second-level high-pressure gas pipe 230 is connected to the first-level high-pressure gas pipe 130, so that any outdoor unit 200 can control all indoor units 100, thereby realizing that some of the outdoor units 200 enter the defrosting mode. When the outdoor units 200 are in the defrosting state, the other part of the outdoor units 200 can control all the indoor units 100 to maintain the original working state (i.e., cooling state or heating state), thereby avoiding the need for the corresponding indoor units 100 to cooperate with the shutdown when the outdoor units 200 are defrosting, thereby achieving the effect of defrosting without stopping the machine; and in actual application, the missing operating energy demand (i.e., operating capacity and demand) due to the defrosting of some outdoor units 200 can be reallocated to all outdoor units 200 in the non-defrosting state, so that the original total amount of operating energy demand of the system remains unchanged, so that the indoor units 100 can maintain the original cooling effect or heating effect, thereby achieving the effect of maintaining the indoor temperature, and effectively avoiding the comfort of the indoor environment being affected by the defrosting of the outdoor units 200.

[0045] In certain embodiments, reference is made to the accompanying Figure 2 The outdoor unit 200 further includes an outdoor unit heat exchanger 1, a main electronic expansion valve 2, a refrigerant heat sink 3, an economizer 4, an auxiliary electronic expansion valve 5, a first four-way valve 6, a second four-way valve 7, a compressor 8, an oil separator 9, an unloading valve 10, a quick oil return valve 11, a gas-liquid separator 12, and a liquid spray cooling valve 13;

[0046] The first end of the secondary liquid pipe 210 is connected to the second end of the refrigerant heat sink 3 through the economizer 4, the first end of the refrigerant heat sink 3 is connected to the second end of the main electronic expansion valve 2, the first end of the main electronic expansion valve 2 is connected to the second end of the outdoor unit heat exchanger 1, and the first end of the outdoor unit heat exchanger 1 is connected to the fourth end of the first four-way valve 6;

[0047] The first end of the secondary liquid pipe 210 is also connected to the second end of the auxiliary electronic expansion valve 5, and the first end of the auxiliary electronic expansion valve 5 is connected to the air supply port of the compressor 8 through the economizer 4;

[0048] The first end of the secondary liquid pipe 210 is also connected to the first end of the first four-way valve 6, the second end of the first four-way valve 6, the fourth end of the second four-way valve 7, the first end of the second four-way valve 7, the inlet of the gas-liquid separator 12, the first end of the secondary low-pressure gas pipe 220, and the second end of the unloading valve 10; the third end of the first four-way valve 6 is connected to the third end of the second four-way valve 7; and the second end of the second four-way valve 7 is connected to the secondary high-pressure gas pipe 230.

[0049] The first end of the secondary liquid pipe 210 is also connected to the second end of the liquid spray cooling valve 13, and the first end of the liquid spray cooling valve 13 is simultaneously connected to the outlet of the gas-liquid separator 12, the second end of the quick oil return valve 11, the return air port of the compressor 8 and the second oil outlet of the oil separator 9, the exhaust port of the compressor 8 is connected to the oil and gas inlet of the oil separator 9, the air outlet of the oil separator 9 is simultaneously connected to the third end of the first four-way valve 6, the third end of the second four-way valve 7 and the first end of the unloading valve 10, and the first oil outlet of the oil separator 9 is connected to the first end of the quick oil return valve 11.

[0050] In this embodiment, the refrigerant circulates between the indoor unit 100 and the outdoor unit 200 between the first-level liquid pipe 110, the second-level liquid pipe 210, the first-level high-pressure gas pipe 130, the second-level high-pressure gas pipe 230, the first-level low-pressure gas pipe 120 and the second-level low-pressure gas pipe 220 and alternates between the liquid phase and the gas phase. Since any outdoor unit 200 is connected to all indoor units 100 through pipelines, any outdoor unit 200 can individually control the refrigerant phase of all outdoor units 200, thereby controlling the outdoor unit 200 to perform cooling, heating and defrosting.

[0051] In certain embodiments, reference is made to the accompanying Figure 2 The outdoor unit 200 also includes a liquid-sensing bypass solenoid valve 14 and a quick defrost valve 15. The liquid-sensing bypass solenoid valve 14 is connected in parallel to the main electronic expansion valve 2; the second end of the quick defrost valve 15 is connected to the first end of the secondary liquid pipe 210, and the first end of the quick defrost valve 15 is simultaneously connected to the first end of the first four-way valve 6, the second end of the first four-way valve 6, the fourth end of the second four-way valve 7, the first end of the second four-way valve 7, the inlet of the gas-liquid separator 12, the first end of the secondary low-pressure gas pipe 220 and the second end of the unloading valve 10.

[0052] In this embodiment, in actual application, the main electronic expansion valve 2 is controlled to open to the maximum and the liquid bypass solenoid valve 14 and the fast defrost valve 15 are controlled to open at the same time, thereby accelerating the defrosting speed of the corresponding outdoor unit 200.

[0053] In certain embodiments, reference is made to the accompanying Figure 2A low-pressure pressure sensor 310 and a low-pressure pressure switch 320 are arranged between the second end of the quick oil return valve 11 and the first end of the liquid spray cooling valve 13. The low-pressure pressure sensor 310 is connected to the low-pressure pressure switch 320 and is used to measure the pressure as control information of the low-pressure pressure switch 320. The arrangement of the low-pressure pressure sensor 310 and the low-pressure pressure switch 320 makes the low-pressure gas phase refrigerant in a controllable state, which is conducive to improving the overall reliability and stability of the system.

[0054] In certain embodiments, reference is made to the accompanying Figure 2 A high-pressure pressure sensor 410 and a high-pressure pressure switch 420 are arranged between the exhaust port of the compressor 8 and the oil and gas inlet of the oil separator 9. The high-pressure pressure sensor 410 is connected to the high-pressure pressure switch 420 and is used to measure the pressure as control information of the high-pressure pressure switch 420. The arrangement of the high-pressure pressure sensor 410 and the high-pressure pressure switch 420 makes the high-pressure gas phase refrigerant in a controllable state, which is conducive to improving the overall reliability and stability of the system.

[0055] In certain embodiments, reference is made to the accompanying Figure 2 A protection switch 500 is also provided between the exhaust port of the compressor 8 and the oil and gas inlet of the oil separator 9. The protection switch 500 is used to disconnect the connection between the compressor 8 and the oil separator 9 in time when the exhaust temperature of the compressor 8 is abnormal, thereby protecting the equipment, ensuring the safe operation of the equipment, and achieving the effect of improving the overall safety of the system.

[0056] In certain embodiments, reference is made to the accompanying Figure 2 A first temperature sensor T1 is provided between the economizer 4 and the first end of the auxiliary electronic expansion valve 5, and a second temperature sensor T2 is provided between the economizer 4 and the air supply port of the compressor 8. The first temperature sensor T1 is used to monitor the temperature of the auxiliary inlet of the economizer, and the second temperature sensor T2 is used to monitor the temperature of the auxiliary outlet of the economizer. Real-time monitoring of the temperature of each component of the system is conducive to ensuring stable operation of the system.

[0057] In certain embodiments, reference is made to the accompanying Figure 2 A third temperature sensor T3 is provided between the economizer 4 and the second end of the refrigerant heat sink 3; a fourth temperature sensor T4 is provided between the first end of the main electronic expansion valve 2 and the second end of the outdoor unit heat exchanger 1; a fifth temperature sensor T5 is provided between the second end of the quick return oil valve 11 and the first end of the spray cooling valve 13. The third temperature sensor T3 is used to monitor the temperature of the heat dissipation outlet in the refrigerant heat sink 3, the fourth temperature sensor T4 is used to monitor the temperature of the outlet in the outdoor unit heat exchanger 1, and the fifth temperature sensor T5 is used to monitor the return air temperature of the low-pressure gas-phase refrigerant. Real-time monitoring of the temperature of each component of the system is conducive to ensuring stable operation of the system.

[0058] In certain embodiments, reference is made to the accompanying Figure 3 , the indoor unit 100 further includes an indoor unit electronic expansion valve 16, an indoor unit heat exchanger 17, a first solenoid valve 18 and a second solenoid valve 19;

[0059] The first-level liquid pipe 110 is simultaneously connected to the second ends of all the second-level liquid pipes 210 and the first ends of all the indoor unit electronic expansion valves 16. The second ends of the indoor unit electronic expansion valves 16 are connected to the first end of the indoor unit heat exchanger 17. The second end of the indoor unit heat exchanger 17 is simultaneously connected to the second end of the first solenoid valve 18 and the second end of the second solenoid valve 19.

[0060] The first-level low-pressure air pipe 120 is simultaneously connected to the second ends of all the second-level low-pressure air pipes 220 and the first end of the second solenoid valve 19;

[0061] The first-level high-pressure gas pipe 130 is simultaneously connected to the second ends of all the second-level high-pressure gas pipes 230 and the first end of the first solenoid valve 18 .

[0062] In this embodiment, the liquid refrigerant enters and exits the indoor unit heat exchanger 17 through the first-level liquid pipe 110, the low-pressure gas-phase refrigerant enters and exits the indoor unit heat exchanger 17 through the second-level low-pressure gas pipe 220, and the high-pressure gas-phase refrigerant enters and exits the indoor unit heat exchanger 17 through the second-level high-pressure gas pipe 230. The three-pipe structure enables the user to change the operating energy demand of the outdoor unit 200 in the non-defrosting state by controlling the gas pressure of the gas-phase refrigerant and make the outdoor unit 200 in the non-defrosting state sufficient to make up for the missing operating energy demand due to the defrosting of some outdoor units 200, thereby keeping the original total operating energy demand of the system unchanged, thereby achieving the effect of maintaining the indoor temperature.

[0063] In certain embodiments, reference is made to the accompanying Figure 3 A sixth temperature sensor T6 is provided between the second end of the indoor unit heat exchanger 17, the second end of the first solenoid valve 18, and the second end of the second solenoid valve 19. The sixth temperature sensor T6 is used to monitor the outlet temperature of the indoor unit heat exchanger 17 in real time, which is conducive to ensuring stable operation of the system.

[0064] In certain embodiments, reference is made to the accompanying Figure 2 and attached Figure 3 The multi-unit air-conditioning parallel system also includes a seventh temperature sensor T7 for detecting the outdoor ambient temperature, an eighth temperature sensor T8 located on the top of the compressor 8 and used to monitor the temperature of the compressor 8, a ninth temperature sensor T9 for detecting the indoor ambient temperature, and a tenth temperature sensor T10 located in the middle of the indoor unit heat exchanger 17 and used to monitor the temperature of the middle of the indoor unit heat exchanger 17.

[0065] Throughout this specification, reference to terms such as "one embodiment," "certain embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0066] The above descriptions are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A multi-unit air-conditioning parallel system, comprising at least one indoor unit (100), characterized in that: The indoor unit (100) comprises a first-level liquid pipe (110), a first-level low-pressure gas pipe (120), and a first-level high-pressure gas pipe (130); The multi-unit air-conditioning parallel system further includes: At least two outdoor units (200), each of the outdoor units (200) comprising a secondary liquid pipe (210), a secondary low-pressure gas pipe (220), and a secondary high-pressure gas pipe (230), wherein all the secondary liquid pipes (210) are in communication with all the primary liquid pipes (110); all the secondary low-pressure gas pipes (220) are in communication with all the primary low-pressure gas pipes (120); and all the secondary high-pressure gas pipes (230) are in communication with all the primary high-pressure gas pipes (130).

2. The multi-station air-conditioning parallel system according to claim 1, characterized in that: The outdoor unit (200) further includes an outdoor unit heat exchanger (1), a main circuit electronic expansion valve (2), a refrigerant heat sink (3), an economizer (4), an auxiliary circuit electronic expansion valve (5), a first four-way valve (6), a second four-way valve (7), a compressor (8), an oil separator (9), an unloading valve (10), a quick oil return valve (11), a gas-liquid separator (12), and a liquid spray cooling valve (13); Wherein, the first end of the secondary liquid pipe (210) is connected to the second end of the refrigerant heat sink (3) through the economizer (4), the first end of the refrigerant heat sink (3) is connected to the second end of the main electronic expansion valve (2), the first end of the main electronic expansion valve (2) is connected to the second end of the outdoor unit heat exchanger (1), and the first end of the outdoor unit heat exchanger (1) is connected to the fourth end of the first four-way valve (6); The first end of the secondary liquid pipe (210) is also connected to the second end of the auxiliary electronic expansion valve (5), and the first end of the auxiliary electronic expansion valve (5) is connected to the air supply port of the compressor (8) through the economizer (4); The first end of the secondary liquid pipe (210) is also simultaneously connected to the first end of the first four-way valve (6), the second end of the first four-way valve (6), the fourth end of the second four-way valve (7), the first end of the second four-way valve (7), the inlet of the gas-liquid separator (12), the first end of the secondary low-pressure gas pipe (220) and the second end of the unloading valve (10); the third end of the first four-way valve (6) is connected to the third end of the second four-way valve (7); and the second end of the second four-way valve (7) is connected to the secondary high-pressure gas pipe (230); The first end of the secondary liquid pipe (210) is also connected to the second end of the liquid spray cooling valve (13), and the first end of the liquid spray cooling valve (13) is simultaneously connected to the outlet of the gas-liquid separator (12), the second end of the quick oil return valve (11), the return air port of the compressor (8), and the second oil outlet of the oil separator (9). The exhaust port of the compressor (8) is connected to the oil and gas inlet of the oil separator (9), and the air outlet of the oil separator (9) is simultaneously connected to the third end of the first four-way valve (6), the third end of the second four-way valve (7), and the first end of the unloading valve (10). The first oil outlet of the oil separator (9) is connected to the first end of the quick oil return valve (11).

3. The multi-unit air-conditioning parallel system according to claim 2, characterized in that: The outdoor unit (200) further comprises a liquid-sensing bypass solenoid valve (14) and a quick defrost valve (15), wherein the liquid-sensing bypass solenoid valve (14) is connected in parallel to the main electronic expansion valve (2); the second end of the quick defrost valve (15) is connected to the first end of the secondary liquid pipe (210), and the first end of the quick defrost valve (15) is simultaneously connected to the first end of the first four-way valve (6), the second end of the first four-way valve (6), the fourth end of the second four-way valve (7), the first end of the second four-way valve (7), the inlet of the gas-liquid separator (12), the first end of the secondary low-pressure gas pipe (220), and the second end of the unloading valve (10).

4. The multi-unit air-conditioning parallel system according to claim 2, characterized in that: A low-pressure pressure sensor (310) and a low-pressure pressure switch (320) are provided between the second end of the quick oil return valve (11) and the first end of the liquid spray cooling valve (13); the low-pressure pressure sensor (310) is connected to the low-pressure pressure switch (320) and is used to measure pressure as control information for the low-pressure pressure switch (320).

5. The multi-unit air-conditioning parallel system according to claim 2, characterized in that: A high-pressure pressure sensor (410) and a high-pressure pressure switch (420) are provided between the exhaust port of the compressor (8) and the oil and gas inlet of the oil separator (9); the high-pressure pressure sensor (410) is connected to the high-pressure pressure switch (420) and is used to measure pressure for serving as control information for the high-pressure pressure switch (420).

6. The multi-unit air-conditioning parallel system according to claim 5, characterized in that: A protection switch (500) is also provided between the exhaust port of the compressor (8) and the oil and gas inlet of the oil separator (9).

7. The multi-unit air-conditioning parallel system according to claim 2, characterized in that: A first temperature sensor (T1) is provided between the economizer (4) and the first end of the auxiliary electronic expansion valve (5), and a second temperature sensor (T2) is provided between the economizer (4) and the air supply port of the compressor (8).

8. The multi-unit air-conditioning parallel system according to claim 2, characterized in that: A third temperature sensor (T3) is provided between the economizer (4) and the second end of the refrigerant heat sink (3); A fourth temperature sensor (T4) is provided between the first end of the main electronic expansion valve (2) and the second end of the outdoor unit heat exchanger (1); A fifth temperature sensor (T5) is provided between the second end of the quick oil return valve (11) and the first end of the liquid spray cooling valve (13).

9. The multi-unit air-conditioning parallel system according to claim 1, characterized in that: The indoor unit (100) further includes an indoor unit electronic expansion valve (16), an indoor unit heat exchanger (17), a first solenoid valve (18), and a second solenoid valve (19); The first-level liquid pipe (110) is simultaneously connected to the second ends of all the second-level liquid pipes (210) and the first ends of all the indoor unit electronic expansion valves (16); the second ends of the indoor unit electronic expansion valves (16) are connected to the first end of the indoor unit heat exchanger (17); and the second ends of the indoor unit heat exchangers (17) are simultaneously connected to the second ends of the first solenoid valves (18) and the second ends of the second solenoid valves (19); The first-level low-pressure air pipe (120) is simultaneously connected to the second ends of all the second-level low-pressure air pipes (220) and the first end of the second solenoid valve (19); The first-level high-pressure gas pipe (130) is simultaneously connected to the second ends of all the second-level high-pressure gas pipes (230) and the first end of the first solenoid valve (18).

10. The multi-unit air-conditioning parallel system according to claim 9, characterized in that: A sixth temperature sensor (T6) is provided between the second end of the indoor unit heat exchanger (17), the second end of the first solenoid valve (18), and the second end of the second solenoid valve (19).

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