CN216897591U

CN216897591U - Multi-split air conditioner

Info

Publication number: CN216897591U
Application number: CN202220176739.8U
Authority: CN
Inventors: 王帆; 武连发; 高晗; 金孟孟; 焦华超
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-01-21
Filing date: 2022-01-21
Publication date: 2022-07-05
Anticipated expiration: 2032-01-21

Abstract

The utility model relates to a multi-split air conditioner, multi-split air conditioner includes indoor module, conversion module and outdoor module, through set up first compression blast pipe in outdoor module, second compression blast pipe, first compression breathing pipe, second compression breathing pipe, join in marriage the first compression discharge valve who connects in first compression blast pipe, join in marriage the second compression discharge valve who connects in second compression blast pipe, join in marriage the first compression suction valve who connects in first compression breathing pipe, and join in marriage the second compression suction valve who connects in second compression breathing pipe, only through the first compression discharge valve of simple control, second compression discharge valve, first compression suction valve and second compression suction valve, can realize the switching of complete refrigeration mode and complete heating mode, therefore have the simple characteristics of control.

Description

Multi-split air conditioner

Technical Field

The application relates to the technical field of multi-split air conditioners, in particular to a multi-split air conditioner.

Background

The multi-split air conditioner is an air conditioner integrating the functions of refrigeration, heating, water heating and the like. Because the multifunctional desk can realize multiple functions at the same time, the multifunctional desk is popular with people due to the fact that one desk has multiple functions, and is widely applied to life of people. The traditional multi-split air conditioner pipeline structure is complex, so that the control of the multi-split air conditioner is also complex.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a multi-split air conditioner with simple control, in order to solve the problem of complicated control.

A multi-split air conditioner comprising:

the indoor module comprises at least one group of indoor branches, each group of indoor branches comprises a first heat exchange tube, a second heat exchange tube and an indoor heat exchanger, and one ends of the first heat exchange tube and the second heat exchange tube are communicated with the indoor heat exchanger;

the conversion module comprises at least one group of conversion branches which correspond to all the indoor branches one to one, each group of conversion branches comprises conversion branch pipes, and one end of each conversion branch pipe is communicated with the second heat exchange pipe of the corresponding group of indoor branches; and

the outdoor module comprises a compressor, a first compression exhaust pipe, a second compression exhaust pipe, a first compression suction pipe, a second compression suction pipe, a first compression exhaust valve connected with the first compression exhaust pipe in a matching mode, a second compression exhaust valve connected with the second compression exhaust pipe in a matching mode, a first compression suction valve connected with the first compression suction pipe in a matching mode, and a second compression suction valve connected with the second compression suction pipe in a matching mode, wherein the first compression exhaust valve is located outside a flow path of a refrigerant flowing back to the first compression suction pipe;

the compressor is provided with an exhaust end and a suction end, the first compression exhaust pipe is communicated between the exhaust end and the other end of each first heat exchange pipe, the second compression exhaust pipe is communicated between the exhaust end and the other end of each conversion branch pipe, the first compression air suction pipe is communicated between the suction end and the first compression exhaust pipe, and the second compression air suction pipe is communicated between the suction end and the other end of each second heat exchange pipe;

the multi-split air conditioner has a complete refrigeration mode and a complete heating mode, and when the multi-split air conditioner is in the complete refrigeration mode, the first compression exhaust valve and the second compression suction valve are opened, and the first compression suction valve and the second compression exhaust valve are both closed; and when the air conditioner is in the complete heating mode, the first compression exhaust valve and the second compression suction valve are closed, and the first compression suction valve and the second compression exhaust valve are both opened.

In one embodiment, the second compression/exhaust valve is an electronic expansion valve.

In one embodiment, each group of the conversion branches further includes a first branch valve and a second branch valve, the first branch valve is connected to the conversion branch pipes in the same group, and the second branch valve is connected to the corresponding second heat exchange pipe and is located outside a flow path of a refrigerant in the second heat exchange pipe and the conversion branch pipe;

when in the full cooling mode, each first branch valve is closed, and each second branch valve is opened; in the full heating mode, each of the first bypass valves is opened, and each of the second bypass valves is closed.

In one embodiment, at least two groups of indoor branches are provided, and the multi-split air conditioner further comprises a main body refrigeration mode in which the refrigeration capacity is greater than the heating capacity;

in the main body cooling mode, the first compression discharge valve, the second compression suction valve, each of the second branch valves corresponding to each group of the indoor branches for cooling, and each of the first branch valves corresponding to each group of the indoor branches for heating are all opened;

the first compression suction valve, each of the first branch valves corresponding to each set of the indoor branches for cooling, and each of the second branch valves corresponding to each set of the indoor branches for heating are closed.

In one embodiment, the indoor branches are at least two groups, and the multi-split air conditioner further comprises a main body heating mode in which the heating capacity is greater than the cooling capacity;

when the main heating mode is adopted, the second compression exhaust valve, the first compression suction valve, the second compression suction valve, each first branch valve corresponding to each group of indoor branches for heating, and each second branch valve corresponding to each group of indoor branches for cooling are all opened;

the first compression discharge valve, the second branch valve corresponding to each of the indoor branches for each group for heating, and the first branch valve corresponding to each of the indoor branches for each group for cooling are all closed.

In one embodiment, in the main heating mode, all the indoor heat exchangers in all the groups of the indoor branches for heating are condensers; or

When the main body heating mode is adopted, the indoor heat exchangers in all the groups of indoor branches for heating are condensers in part of the groups of indoor branches, and the indoor heat exchangers in the other groups of indoor branches are hot water generators.

In one embodiment, the indoor heat exchanger is at least one of an evaporator and a cold water generator;

when the indoor heat exchangers are in the main heating mode, all the indoor branches are used for cooling, and all the indoor heat exchangers are the evaporators; or

When the main body heating mode is adopted, the indoor heat exchangers in all the groups of indoor branches used for refrigeration are the evaporators, and the indoor heat exchangers in the rest groups of indoor branches are the cold water generators.

In one embodiment, the indoor branches are at least two groups, and the multi-split air conditioner further comprises a complete heat recovery mode in which the heating capacity is equal to the cooling capacity;

in the full heat recovery mode, the second compression discharge valve, the second compression suction valve, each of the first branch valves corresponding to each group of the indoor branches for heating, and each of the second branch valves corresponding to each group of the indoor branches for cooling are opened;

the first compression discharge valve, the first compression suction valve, each of the second branch valves corresponding to each group of the indoor branches for heating, and each of the first branch valves corresponding to each group of the indoor branches for cooling are all closed.

In one embodiment, the second compressively absorbing valve is a check valve.

In one embodiment, the oil separator is communicated between the exhaust end and the first compression exhaust pipe and between the exhaust end and the second compression exhaust pipe.

According to the multi-split air conditioner, the first compression exhaust pipe, the second compression exhaust pipe, the first compression air suction pipe, the second compression air suction pipe, the first compression exhaust valve, the second compression exhaust valve, the first compression air suction valve and the second compression air suction valve are arranged, and the switching between the complete refrigeration mode and the complete heating mode can be realized only by simply controlling the first compression exhaust valve, the second compression exhaust valve, the first compression air suction valve and the second compression air suction valve, so that the multi-split air conditioner has the characteristic of simple control.

Drawings

Fig. 1 is a schematic structural diagram of a multi-split air conditioner in a main heating mode according to an embodiment of the present application.

Reference numerals:

1. a multi-split air conditioner; 10. an indoor module; 11. a first set of indoor branches; 12. a second set of indoor branches; 13. a third set of indoor branches; 14. a fourth group of indoor branches; 15. a fifth set of indoor branches; 16. a sixth set of indoor branches; 17. a first heat exchange tube; 18. a second heat exchange tube; 19. an indoor heat exchanger; 21. an indoor expansion valve; 30. a conversion module; 31. a first set of conversion legs; 32. a second set of switching legs; 33. a third set of conversion legs; 34. a fourth group of conversion branches; 35. a fifth set of switching legs; 36. a sixth set of conversion legs; 37. converting branch pipes; 38. a first bypass valve; 39. a second bypass valve; 40. an outdoor module; 41. a compressor; 42. a first compression exhaust pipe; 43. a second compression exhaust pipe; 44. a first compression suction duct; 45. a second compression suction duct; 46. a first compression exhaust valve; 47. a second compression exhaust valve; 48. a first compression suction valve; 49. a second compression suction valve; 51. an outdoor heat exchanger; 52. an outdoor heat exchange pipe; 53. an outdoor expansion valve; 54. an outdoor control valve; 55. a third compression exhaust valve; 56. a third compression suction valve; 60. an oil separator; 70. a gas-liquid separator.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiment in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and therefore the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1, the present application provides a multi-split air conditioner 1, which includes an indoor module 10, a conversion module 30, and an outdoor module 40, wherein the indoor module 10 and the conversion module 30 are located inside a building (e.g., indoors), and the outdoor module 40 is located outside the building (e.g., outdoors).

The indoor module 10 comprises at least one group of indoor branches, each group of indoor branches comprises a first heat exchange tube 17, a second heat exchange tube 18, an indoor heat exchanger 19 and an indoor expansion valve 21, one end of each of the first heat exchange tube 17 and the second heat exchange tube 18 is communicated with the indoor heat exchanger 19 in the same group, and the indoor expansion valve 21 is connected to the first heat exchange tube 17 in the same group in a matching mode. The indoor heat exchanger 19 may be one or more of a condenser, an evaporator, a hot water generator, and a cold water generator, and may be specifically configured according to different operation modes of the multi-split air conditioner 1.

The conversion module 30 includes at least one set of conversion branches corresponding to all the indoor branches one to one, each set of conversion branches includes a conversion branch pipe 37, and one end of each conversion branch pipe 37 is communicated with the second heat exchange pipe 18 of the corresponding set of indoor branches. That is, the number of groups of the switching branches is the same as the number of groups of the indoor branches, and the switching branches correspond to one another.

The outdoor module 40 includes a compressor 41, a first compression discharge pipe 42, a second compression discharge pipe 43, a first compression suction pipe 44, a second compression suction pipe 45, a first compression discharge valve 46, a second compression discharge valve 47, a first compression suction valve 48, and a second compression suction valve 49. The first compression exhaust valve 46 is connected to the first compression exhaust pipe 42 for controlling the on/off of the first compression exhaust pipe 42, and the first compression exhaust valve 46 is located outside the flow path of the refrigerant flowing back to the first compression suction pipe 44. A second compression discharge valve 47 is connected to the second compression discharge pipe 43 for controlling the on/off of the second compression discharge pipe 43, a first compression suction valve 48 is connected to the first compression suction pipe 44 for controlling the on/off of the first compression suction pipe 44, and a second compression suction valve 49 is connected to the second compression suction pipe 45 for controlling the on/off of the second compression suction pipe 45.

The compressor 41 has an exhaust end and an air suction end, the first compression exhaust pipe 42 is connected between the exhaust end and the other end of each first heat exchange pipe 17, the second compression exhaust pipe 43 is connected between the exhaust end and the other end of each conversion branch pipe 37, the first compression air suction pipe 44 is connected between the air suction end and the first compression exhaust pipe 42, and the second compression air suction pipe 45 is connected between the air suction end and the other end of each second heat exchange pipe 18.

The outdoor module 40 further includes an outdoor heat exchanger 51, an outdoor heat exchange pipe 52, an outdoor expansion valve 53, an outdoor control valve 54, a third compression discharge valve 55, and a third compression suction valve 56. The first compression discharge pipe 42 communicates with the other end of each first heat exchanging pipe 17 through an outdoor heat exchanger 51 and an outdoor heat exchanging pipe 52. Specifically, the outdoor heat exchanger 51 has opposite first and second ends, the first compression exhaust pipe 42 communicates between the exhaust end and the first end, and the outdoor heat exchange pipe 52 communicates between the second end and the other end of each of the first heat exchange pipes 17, so that the first compression exhaust pipe 42 can communicate with the other end of each of the first heat exchange pipes 17. The outdoor expansion valve 53 and the outdoor control valve 54 are both connected to the outdoor heat exchange tube 52 and are used for controlling the on/off of the outdoor heat exchange tube 52, the third compression exhaust valve 55 is connected to the second compression exhaust tube 43 and is used for controlling the on/off of the second compression exhaust tube 43, and the third compression suction valve 56 is connected to the second compression suction tube 45 and is used for controlling the on/off of the second compression suction tube 45. The outdoor heat exchanger 51 may be one of a condenser and an evaporator, and may be specifically switched according to different operation modes of the multi-split air conditioner 1.

The multi-split air conditioner 1 has a complete cooling mode and a complete heating mode. In the full cooling mode, the first compression/discharge valve 46, the outdoor expansion valve 53, the outdoor control valve 54, the second compression/suction valve 49, and the third compression/suction valve 56 are all opened, and the first compression/suction valve 48, the second compression/discharge valve 47, and the third compression/discharge valve 55 are all closed. The compressor 41 compresses a refrigerant into a high-temperature and high-pressure gas, and then passes through the first compression discharge pipe 42, the first compression discharge valve 46, and the outdoor heat exchanger 51. The high-temperature and high-pressure gas is condensed into medium-temperature and medium-pressure liquid in the outdoor heat exchanger 51, then passes through the outdoor expansion valve 53, the outdoor control valve 54 and the outdoor heat exchange tube 52, is divided at the outdoor heat exchange tube 52, and flows into the first heat exchange tubes 17 of each group of indoor branches respectively. In the process of flowing through each first heat exchange tube 17, the medium-temperature medium-pressure liquid passes through the indoor expansion valve 21 in the same group, and is changed into low-temperature low-pressure liquid under the throttling action of the indoor expansion valve 21, and then flows into the indoor heat exchanger 19 in the same group for heat exchange, and low-temperature low-pressure gas is formed. Then, the low-temperature and low-pressure gas formed in each indoor branch is converged to the second compressing suction pipe 45 through the second heat exchange pipe 18 in the same group, and flows back to the compressor 41 through the third compressing suction valve 56 and the second compressing suction valve 49, so as to complete the single refrigeration cycle.

In the complete heating mode, the first compression/discharge valve 46, the second compression/discharge valve 49, and the third compression/discharge valve 56 are all closed, and the first compression/discharge valve 48, the second compression/discharge valve 47, the third compression/discharge valve 55, the outdoor expansion valve 53, and the outdoor control valve 54 are all opened. The compressor 41 compresses the refrigerant into a high-temperature and high-pressure gas, and then the high-temperature and high-pressure gas flows into each indoor heat exchanger 19 through the second compression exhaust pipe 43, the second compression exhaust valve 47, the third compression exhaust valve 55, the switching branch pipe 37 in each set of switching branches, and each second heat exchange pipe 18. Then, the high-temperature and high-pressure gas flowing into each indoor heat exchanger 19 releases heat and condenses into medium-temperature and medium-pressure liquid under the action of the corresponding indoor heat exchanger 19, and then flows together to the outdoor heat exchange tube 52 after passing through the indoor expansion valve 21 on each first heat exchange tube 17. Then, the medium temperature and medium pressure liquid in the outdoor heat exchange tube 52 passes through the outdoor control valve 54 and the outdoor expansion valve 53, and is changed into low temperature and low pressure liquid after the throttling action of the outdoor expansion valve 53, enters the outdoor heat exchanger 51 to be evaporated into low temperature and low pressure gas, and then returns to the compressor 41 through the first compression suction valve 48, thereby completing the single heating cycle.

As can be seen from the above, in the multi-split air conditioner 1 of the present application, by providing the first compressing exhaust pipe 42, the second compressing exhaust pipe 43, the first compressing intake pipe 44, the second compressing intake pipe 45, the first compressing exhaust valve 46, the second compressing exhaust valve 47, the first compressing intake valve 48, and the second compressing intake valve 49, the switching between the complete cooling mode and the complete heating mode can be achieved only by simply controlling the first compressing exhaust valve 46, the second compressing exhaust valve 47, the first compressing intake valve 48, and the second compressing intake valve 49, and thus, the control is simple.

The outdoor expansion valve 53, the outdoor control valve 54, the third compression exhaust valve 55 and the third compression suction valve 56 are arranged, so that the reliability of opening and closing of corresponding pipelines can be enhanced, the internal channeling of the multi-split air conditioner 1 can be prevented, and the multi-split air conditioner 1 has better working reliability.

In addition, in the conventional multi-split air conditioner 1, the second compression discharge valve 47 is provided on the switching branch pipe 37 in the switching module 30. The second compression exhaust valve 47 is an electronic expansion valve, which generates a large noise during operation. Since the converting module 30 is disposed in the building, the noise is relatively high, which results in poor experience of the user. In the present application, the second compression exhaust valve 47 is disposed in the outdoor module 40, so that even if the second compression exhaust valve 47 generates a large noise, the interference to the life of the user is small, and the user experience is better. Preferably, the second compression suction valve 49 is a one-way valve. In this way, when the refrigerant flows back to the compressor 41 through the second compression suction pipe 45, the refrigerant is prevented from flowing backward, thereby ensuring the operation reliability of the multi-split air conditioner 1.

It should be noted that when the multi-split air conditioner 1 is in the complete heating mode, each indoor heat exchanger 19 is one of a condenser and a hot water generator, and all the indoor heat exchangers 19 may be condensers, may also be hot water generators, or the condensers and the hot water generators coexist. When the multi-split air conditioner 1 is in the complete refrigeration mode, each indoor heat exchanger 19 is one of an evaporator and a cold water generator, and all the indoor heat exchangers 19 may be evaporators or cold water generators, or the evaporators and the cold water generators coexist.

In some embodiments, each group of the switching branches further includes a first branch valve 38 and a second branch valve 39, the first branch valve 38 is coupled to the switching branch pipe 37 in the same group, the second branch valve 39 is coupled to the corresponding second heat exchange pipe 18, and the second branch valve 39 is located outside the flow path of the refrigerant in the second heat exchange pipe 18 and the switching branch pipe 37. In the full cooling mode, each first bypass valve 38 is closed, and each second bypass valve 39 is opened. In this way, it is ensured that the high-temperature and high-pressure gas flowing out of the compressor 41 flows into each indoor heat exchanger 19 only through the first compression exhaust pipe 42, the outdoor heat exchange pipe 52 and each first heat exchange pipe 17, and it is also ensured that the low-temperature and low-pressure gas in each indoor heat exchanger 19 can flow together to the second compression suction pipe 45 through the respectively corresponding second heat exchange pipe 18. In the full heating mode, each first bypass valve 38 is opened and each second bypass valve 39 is closed. In this way, it is ensured that the high-temperature and high-pressure gas flowing out of the compressor 41 flows into each indoor heat exchanger 19 only through the second compression exhaust pipe 43, each conversion branch pipe 37 and each second heat exchange pipe 18, and it is also ensured that the medium-temperature and medium-pressure liquid in each indoor heat exchanger 19 can flow together to the outdoor heat exchange pipe 52 through the corresponding first heat exchange pipe 17 and flow back to the compressor 41 through the first compression suction pipe 44. Therefore, the pipelines in the whole multi-split air conditioner 1 cannot flow by cross flow, and the working reliability of the multi-split air conditioner 1 is guaranteed.

The multi-split air conditioner 1 further comprises a main body refrigeration mode in which the refrigerating capacity is greater than the heating capacity. In the main body cooling mode, the first compression discharge valve 46, the outdoor expansion valve 53, the outdoor control valve 54, the second compression discharge valve 47, the third compression discharge valve 55, the second compression suction valve 49, the third compression suction valve 56, each second branch valve 39 corresponding to each set of indoor branches for cooling, and each first branch valve 38 corresponding to each set of indoor branches for heating are opened. The first compression suction valve 48, each first branch valve 38 corresponding to each set of indoor branches for cooling, and each second branch valve 39 corresponding to each set of indoor branches for heating are closed.

For example, the indoor branches are four groups, and the first, second, and third indoor branches 13 are used for cooling, and the fourth indoor branch 14 is used for heating. Correspondingly, the number of the conversion branches is also four, the first, second and third conversion branches 33 correspond to the first, second and third indoor branches 13 one to one, and the fourth conversion branch 34 corresponds to the fourth indoor branch 14.

In the main cooling mode, the compressor 41 compresses the refrigerant into high-temperature and high-pressure gas, and outputs the gas through the discharge end. Subsequently, the refrigerant is divided into two paths: one of the high-temperature and high-pressure gas flows into the indoor heat exchanger 19 of the fourth group of indoor branches 14 through the second compression exhaust pipe 43, the second compression exhaust valve 47, the third compression exhaust valve 55, the switching branch pipe 37 of the fourth group of switching branches 34 and the second heat exchange pipe 18 of the fourth group of indoor branches 14, then releases heat under the action of the indoor heat exchanger 19 of the fourth group of indoor branches 14 and is condensed into medium-temperature and medium-pressure liquid, and then flows into the outdoor heat exchange pipe 52 through the indoor expansion valve 21 on the first heat exchange pipe 17 of the fourth group of indoor branches 14.

The other path of high-temperature and high-pressure gas passes through the first compression exhaust pipe 42, the first compression exhaust valve 46 and the outdoor heat exchanger 51. The high-temperature high-pressure gas flows through the outdoor heat exchanger 51 and is condensed to form medium-temperature medium-pressure liquid, and then the medium-temperature medium-pressure liquid flows through the outdoor expansion valve 53 and the outdoor control valve 54 at the outdoor heat exchange tube 52 and is merged with the medium-temperature medium-pressure liquid flowing out of the fourth group of outdoor branches, then the liquid is divided, and flows into the first heat exchange tubes 17 in the first group of indoor branches 11, the second group of indoor branches 12 and the third group of indoor branches 13 respectively. In the process of flowing through the first heat exchange tubes 17 in the first group of indoor branches 11, the second group of indoor branches 12 and the third group of indoor branches 13, the medium-temperature medium-pressure liquid passes through the indoor expansion valves 21 in the first group of indoor branches 11, the second group of indoor branches 12 and the third group of indoor branches 13, forms low-temperature low-pressure liquid under the throttling action of the indoor expansion valves 21 corresponding to the medium-temperature medium-pressure liquid, then flows into the indoor heat exchangers 19 in the same group for heat exchange, and forms low-temperature low-pressure gas. Then, the low-temperature and low-pressure gas formed in the first group of indoor branches 11, the second group of indoor branches 12 and the third group of indoor branches 13 flows together in the second compression suction pipe 45 through the second heat exchange pipe 18 in the same group, and flows back to the compressor 41 through the third compression suction valve 56 and the second compression suction valve 49, thereby completing the single-body refrigeration mode cycle.

In the main cooling mode, all the indoor heat exchangers 19 in all the sets of indoor branches for cooling are evaporators. All evaporators are used for cooling the room. Or, in the main cooling mode, the indoor heat exchangers 19 in all the groups of indoor branches used for cooling are evaporators, and the indoor heat exchangers 19 in the other groups of indoor branches are cold water generators. The cold water produced by the cold water generator can be used for providing domestic cold water or refrigerating the indoor.

In the main cooling mode, all the indoor heat exchangers 19 in all the sets of indoor branches for heating are condensers. All condensers are used to heat the room. Or, in the main cooling mode, the indoor heat exchangers 19 in all the groups of indoor branches for heating are condensers, and the indoor heat exchangers 19 in the other groups of indoor branches are hot water generators. The hot water prepared by the hot water generator can be used for providing domestic hot water or floor heating.

It should be noted that, in the main refrigeration mode, since the cooling capacity is greater than the heating capacity, the flow rate of the refrigerant diverted into the first compression exhaust pipe 42 needs to be greater than the flow rate of the refrigerant diverted into the second compression exhaust pipe 43. Preferably, the second compression/exhaust valve 47 is an electronic expansion valve, and the flow rates of the refrigerant flowing into the first compression/exhaust pipe 42 and the second compression/exhaust pipe 43 can be adjusted by controlling the opening degree of the electronic expansion valve. For example, the first compression exhaust valve 46 may be opened seventy-five percent and the second compression exhaust valve 47 may be opened twenty-five percent, such that most of the high temperature and high pressure gas in the compressor 41 flows into the first compression exhaust pipe 42 and only a small portion of the high temperature and high pressure gas flows into the second compression exhaust pipe 43. The majority of the high-temperature and high-pressure gas is refrigerant amount larger than fifty percent of the high-temperature and high-pressure gas output by the compressor 41 in a unit time. The small portion of the high-temperature and high-pressure gas means a refrigerant amount of less than or equal to fifty percent of the high-temperature and high-pressure gas output by the compressor 41 per unit time. Of course, the specific opening degree is not limited to the above-described embodiment, and it is understood that the more the cooling capacity for cooling, the smaller the opening degree of the second compression discharge valve 47.

Of course, the adjustment method of the refrigerant amount is not limited to the above-mentioned one, and in other embodiments, the refrigerant amount branched to the first compression/discharge pipe 42 and the second compression/discharge pipe 43 may be adjusted by adjusting the opening degree of the third compression/discharge valve 55 and/or adjusting the opening degree of the first compression/discharge valve 46. In an embodiment, there are at least two groups of indoor branches, and the multi-split air conditioner 1 further includes a main heating mode in which the heating capacity is greater than the cooling capacity. In the main body heating mode, the second compression discharge valve 47, the third compression discharge valve 55, the first compression suction valve 48, the second compression suction valve 49, the third compression suction valve 56, the outdoor expansion valve 53, the outdoor control valve 54, each first branch valve 38 corresponding to each set of indoor branches for heating, and each second branch valve 39 corresponding to each set of indoor branches for cooling are opened. The first compression discharge valve 46, the second branch valve 39 of each corresponding to each set of indoor branches for heating, and each first branch valve 38 corresponding to each set of indoor branches for cooling are closed.

For example, the indoor branches are four groups, and the first, second, and third indoor branches 13 are used for heating, and the fourth indoor branch 14 is used for cooling. In the main heating mode, the compressor 41 compresses the refrigerant into high-temperature and high-pressure gas, and outputs the gas through the exhaust end. Subsequently, the high-temperature and high-pressure gas passes through the second compression discharge valve 47, the third compression discharge valve 55, and the second compression discharge pipe 43, and is branched at the second compression discharge pipe 43. The high-temperature high-pressure gas after being divided is divided into three paths. The first branch flows into the indoor heat exchangers 19 of the first group of indoor branches 11 via the switching branch pipes 37 in the first group of switching branches 31. The second path flows into the indoor heat exchangers 19 of the second group of indoor branches 12 through the switching branch pipes 37 in the second group of switching branches 32. The third path flows into the indoor heat exchanger 19 of the third group of indoor branches 13 through the switching branch pipe 37 in the third group of switching branches 33. The high-temperature and high-pressure gas flowing into the indoor heat exchangers 19 in the first group of indoor branches 11, the second group of indoor branches 12 and the third group of indoor branches 13 releases heat and is condensed into medium-temperature and medium-pressure liquid, and then flows into the outdoor heat exchange tube 52 through the corresponding first heat exchange tube 17.

Then, the medium temperature and medium pressure liquid is divided in the outdoor heat exchange tube 52, wherein one of the liquid flows into the fourth group of indoor heat exchangers 19 through the first heat exchange tube 17 of the fourth group of indoor branches 14, and forms low temperature and low pressure gas under the action of the indoor heat exchangers 19 in the fourth group of indoor branches 14, and then flows back to the compressor 41 through the second heat exchange tube 18 of the fourth group of indoor branches 14, the switching branch tube 37 of the fourth group of switching branches 34 and the second compression suction tube 45. The other path of the refrigerant is throttled by an outdoor expansion valve 53 on an outdoor heat exchange tube 52 to become low-temperature low-pressure liquid, then is evaporated into low-temperature low-pressure gas by an outdoor heat exchanger 51, finally flows back into the compressor 41 through a first compression suction tube 44, and completes a single main body heating cycle.

It should be noted that, in the main heating mode, the heating capacity of the multi-split air conditioner 1 is greater than the cooling capacity, and therefore, the amount of the refrigerant flowing into the outdoor expansion valve 53 in the outdoor heat exchange tube 52 needs to be greater than the flow rate of the refrigerant flowing into the fourth group indoor branch 14. Preferably, the refrigerant amount converged by the outdoor heat exchange tube 52 to the compressor 41 and branched to the fourth group indoor branch 14 can be adjusted by adjusting the second compression suction valve 49, the third compression suction valve 56, the second branch valve 39 in the fourth group switching branch 34, or the like.

In the main heating mode, all the indoor heat exchangers 19 in all the sets of indoor branches for heating are condensers. All condensers are used to heat the room. Or, in the main heating mode, the indoor heat exchangers 19 in all the groups of indoor branches for heating are condensers, and the indoor heat exchangers 19 in the remaining groups of indoor branches are hot water generators. The hot water prepared by the hot water generator can be used for providing domestic hot water or floor heating.

Further, the indoor heat exchanger 19 is at least one of an evaporator and a cold water generator. In the main heating mode, all the indoor heat exchangers 19 are evaporators in all the sets of indoor branches for cooling. All evaporators are used for cooling the room. Or, when in the main heating mode, the indoor heat exchangers 19 in all the groups of indoor branches for cooling are evaporators, and the indoor heat exchangers 19 in the other groups of indoor branches are cold water generators. The cold water produced by the cold water generator can be used for providing domestic cold water or refrigerating the indoor.

Taking the indoor branch as six groups as an example, for example, the indoor heat exchangers 19 in the first, second, and third groups of

indoor branches

11, 12, and 13 may be condensers, the indoor heat exchanger 19 in the fourth group of indoor branches 14 may be a hot water generator, the indoor heat exchanger 19 in the fifth group of indoor branches 15 may be an evaporator, and the indoor heat exchanger 19 in the sixth group of indoor branches 16 may be a cold water generator. Correspondingly, the number of the conversion branches is also six, the first group of conversion branches 31 corresponds to the first group of indoor branches 11, the second group of conversion branches 32 corresponds to the second group of indoor branches 12, the third group of conversion branches 33 corresponds to the third group of indoor branches 13, the fourth group of conversion branches 34 corresponds to the fourth group of indoor branches 14, the fifth group of conversion branches 35 corresponds to the fifth group of indoor branches 15, and the sixth group of conversion branches 36 corresponds to the sixth group of indoor branches 16.

In one embodiment, there are at least two indoor branches, and the multi-split air conditioner 1 further includes a full heat recovery mode in which the heating capacity is equal to the cooling capacity. In the full heat recovery mode, the second compression discharge valve 47, the third compression discharge valve 55, the second compression suction valve 49, the third compression suction valve 56, each first branch valve 38 corresponding to each set of indoor branches for heating, and each second branch valve 39 corresponding to each set of indoor branches for cooling are opened. The first compression discharge valve 46, the first compression suction valve 48, the outdoor expansion valve 53, the outdoor control valve 54, each second branch valve 39 corresponding to each set of indoor branches for heating, and each first branch valve 38 corresponding to each set of indoor branches for cooling are closed.

For example, the indoor branches and the switching branches are four groups, the first and second groups of indoor branches 12 are used for heating, and the third and fourth groups of indoor branches 14 are used for cooling. In the complete heat recovery mode, the compressor 41 compresses the refrigerant into high-temperature and high-pressure gas, and outputs the gas through the exhaust end. Subsequently, the high-temperature and high-pressure gas passes through the second compression discharge valve 47, the third compression discharge valve 55, and the second compression discharge pipe 43, and is branched at the second compression discharge pipe 43. One of the two flows into the indoor heat exchanger 19 in the first group of indoor branches 11 through the switching branch pipe 37 in the first group of switching branches 31 and the second heat exchange pipe 18 in the first group of indoor branches 11. The other path flows into the indoor heat exchanger 19 in the second group of indoor branches 12 through the switching branch pipe 37 in the second group of switching branches 32 and the second heat exchange pipe 18 in the second group of indoor branches 12. Then, the high-temperature and high-pressure gas exchanges heat in the indoor heat exchangers 19 in the first group of indoor branches 11 and the second group of indoor branches 12, and medium-temperature and medium-pressure liquid is formed. Then, the heat exchange tubes flow to the outdoor heat exchange tube 52 through the corresponding first heat exchange tube 17 in the first group of indoor branches 11 and the first heat exchange tube 17 in the second group of indoor branches 12.

Furthermore, the medium temperature and medium pressure liquid is divided in the outdoor heat exchange tube 52, and one of the liquid flows into the indoor heat exchanger 19 in the third group of indoor branches 13 through the first heat exchange tube 17 and the indoor expansion valve 21 in the third group of indoor branches 13. After passing through the indoor expansion valve 21 of the third group of indoor branches 13, the medium temperature and medium pressure liquid forms a low temperature and low pressure liquid. After passing through the indoor heat exchanger 19 of the third group of indoor branches 13, the low-temperature and low-pressure liquid forms low-temperature and low-pressure gas. The other flow passes through the first heat exchange tube 17 of the fourth indoor branch 14 and the indoor expansion valve 21 and flows into the indoor heat exchanger 19 of the fourth indoor branch 14. After passing through the indoor expansion valve 21 of the fourth indoor branch 14, the medium temperature and medium pressure liquid forms a low temperature and low pressure liquid. After passing through the indoor heat exchanger 19 of the fourth indoor branch 14, the low-temperature low-pressure liquid forms low-temperature low-pressure gas. Then, the low-temperature and low-pressure gas in the third group of indoor branches 13 and the fourth group of indoor branches 14 respectively flows through the corresponding second heat exchange tubes 18 to converge to the second compression gas suction pipe 45 and flows back to the compressor 41, and a single complete heat recovery mode cycle is completed.

In some embodiments, the multi-split air conditioner 1 further includes an oil separator 60, and the oil separator 60 is communicated between the exhaust end and the first compression exhaust pipe 42, and between the exhaust end and the second compression exhaust pipe 43. The refrigerant flowing out of the discharge end of the compressor 41 passes through the oil separator 60 and then flows into the first compression/discharge pipe 42 and/or the second compression/discharge pipe 43. Specifically, the refrigerant flowing out of the compressor 41 may carry lubricating oil in the compressor 41, and by providing the oil separator 60, the oil separator 60 is used for separating the lubricating oil in the refrigerant, so that the refrigerant flowing out of the compressor 41 is cleaner.

In some embodiments, the multi-split air conditioner 1 further includes a gas-liquid separator 70, and the gas-liquid separator 70 is communicated between the suction end and the first compressing suction pipe 44, and between the suction end and the second compressing suction pipe 45. The refrigerant flowing back from the first suction pipe 44 and/or the second suction pipe 45 is required to pass through the gas-liquid separator 70 and then flow back to the compressor 41. Specifically, the refrigerant after heat exchange by the indoor heat exchanger 19 and/or the outdoor heat exchanger 51 may carry a small amount of liquid refrigerant, and by providing the gas-liquid separator 70, the gas-liquid separator 70 is configured to separate the liquid refrigerant from the gas-liquid mixed refrigerant, so that the refrigerant flowing back to the compressor 41 is all in a gaseous state.

In the multi-split air conditioner 1, the first compression exhaust pipe 42, the second compression exhaust pipe 43, the first compression intake pipe 44, the second compression intake pipe 45, the first compression exhaust valve 46, the second compression exhaust valve 47, the first compression intake valve 48 and the second compression intake valve 49 are provided, and the switching between the complete cooling mode and the complete heating mode can be realized only by simply controlling the first compression exhaust valve 46, the second compression exhaust valve 47, the first compression intake valve 48 and the second compression intake valve 49, so that the control is simple.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A multi-split air conditioner (1) characterized by comprising:

the indoor module (10) comprises at least one group of indoor branches, each group of indoor branches comprises a first heat exchange tube (17), a second heat exchange tube (18) and an indoor heat exchanger (19), and one end of each of the first heat exchange tube (17) and the second heat exchange tube (18) is communicated with the indoor heat exchanger (19);

the conversion module (30) comprises at least one group of conversion branches which correspond to all the indoor branches one to one, each group of conversion branches comprises conversion branch pipes (37), and one end of each conversion branch pipe (37) is communicated with the second heat exchange pipes (18) of the corresponding group of indoor branches; and

an outdoor module (40) including a compressor (41), a first compression exhaust pipe (42), a second compression exhaust pipe (43), a first compression intake pipe (44), a second compression intake pipe (45), a first compression exhaust valve (46) coupled to the first compression exhaust pipe (42), a second compression exhaust valve (47) coupled to the second compression exhaust pipe (43), a first compression intake valve (48) coupled to the first compression intake pipe (44), and a second compression intake valve (49) coupled to the second compression intake pipe (45), wherein the first compression exhaust valve (46) is located outside a flow path through which refrigerant flows back to the first compression intake pipe (44);

the compressor (41) is provided with an exhaust end and a suction end, the first compression exhaust pipe (42) is communicated between the exhaust end and the other end of each first heat exchange pipe (17), the second compression exhaust pipe (43) is communicated between the exhaust end and the other end of each conversion branch pipe (37), the first compression air suction pipe (44) is communicated between the suction end and the first compression exhaust pipe (42), and the second compression air suction pipe (45) is communicated between the suction end and the other end of each second heat exchange pipe (18);

the multi-split air conditioner (1) is provided with a complete cooling mode and a complete heating mode, when in the complete cooling mode, the first compression exhaust valve (46) and the second compression suction valve (49) are opened, and the first compression suction valve (48) and the second compression exhaust valve (47) are closed; and when the air conditioner is in the complete heating mode, the first compression exhaust valve (46) and the second compression suction valve (49) are closed, and the first compression suction valve (48) and the second compression exhaust valve (47) are both opened.

2. A multi-split air conditioner (1) as claimed in claim 1, wherein the second compression exhaust valve (47) is an electronic expansion valve.

3. A multi-split air conditioner (1) as claimed in any one of claims 1 to 2, wherein each group of the switching branches further comprises a first branch valve (38) and a second branch valve (39), the first branch valve (38) is coupled to the switching branch pipe (37) in the same group, and the second branch valve (39) is coupled to the corresponding second heat exchange pipe (18) and is located outside the flow path of the refrigerant in the second heat exchange pipe (18) and the switching branch pipe (37);

in the full cooling mode, each first bypass valve (38) is closed, and each second bypass valve (39) is opened; in the full heating mode, each of the first bypass valves (38) is opened, and each of the second bypass valves (39) is closed.

4. A multi-split air conditioner (1) as claimed in claim 3, wherein the indoor branches are at least two groups, and the multi-split air conditioner (1) further comprises a main cooling mode in which the cooling capacity is greater than the heating capacity;

in the main body cooling mode, the first compression discharge valve (46), the second compression discharge valve (47), the second compression suction valve (49), each of the second branch valves (39) corresponding to each set of the indoor branches for cooling, and each of the first branch valves (38) corresponding to each set of the indoor branches for heating are opened;

the first compression suction valve (48), each of the first branch valves (38) corresponding to each set of the indoor branches for cooling, and each of the second branch valves (39) corresponding to each set of the indoor branches for heating are closed.

5. A multi-split air conditioner (1) as claimed in claim 3, wherein the indoor branches are at least two groups, and the multi-split air conditioner (1) further comprises a main heating mode in which the heating capacity is larger than the cooling capacity;

in the heating-by-body mode, the second compression discharge valve (47), the first compression suction valve (48), the second compression suction valve (49), each of the first branch valves (38) corresponding to each set of the indoor branches for heating, and each of the second branch valves (39) corresponding to each set of the indoor branches for cooling are opened;

the first compression exhaust valve (46), the second branch valve (39) corresponding to each of the indoor branches of each group for heating, and each of the first branch valves (38) corresponding to each of the indoor branches of each group for cooling are all closed.

6. A multi-split air conditioner (1) as claimed in claim 5, characterized in that in the main heating mode, all the indoor heat exchangers (19) in all the groups of the indoor branches for heating are condensers; or alternatively

When the main body heating mode is adopted, the indoor heat exchangers (19) in all the groups of indoor branches for heating are condensers, and the indoor heat exchangers (19) in the rest groups of indoor branches are hot water generators.

7. A multi-split air conditioner (1) as claimed in claim 6, wherein the indoor heat exchanger (19) is at least one of an evaporator and a cold water generator;

in the main heating mode, all the indoor heat exchangers (19) in all the groups of indoor branches for cooling are the evaporators; or

When the main body heating mode is adopted, the indoor heat exchangers (19) in all the groups of indoor branches used for refrigeration are the evaporators, and the indoor heat exchangers (19) in the rest groups of indoor branches are the cold water generators.

8. A multi-split air conditioner (1) as claimed in claim 3, wherein the indoor branches are at least two groups, and the multi-split air conditioner (1) further comprises a full heat recovery mode in which the heating capacity is equal to the cooling capacity;

in the full heat recovery mode, the second compression discharge valve (47), the second compression suction valve (49), each of the first branch valves (38) corresponding to each set of the indoor branches for heating, and each of the second branch valves (39) corresponding to each set of the indoor branches for cooling are opened;

the first compression discharge valve (46), the first compression suction valve (48), each of the second branch valves (39) corresponding to each set of the indoor branches for heating, and each of the first branch valves (38) corresponding to each set of the indoor branches for cooling are closed.

9. A multi-split air conditioner (1) as claimed in claim 1, wherein said second compression suction valve (49) is a check valve.

10. A multi-split air conditioner (1) as claimed in claim 1, further comprising an oil separator (60), wherein the oil separator (60) is communicated between the exhaust end and the first compression exhaust pipe (42) and between the exhaust end and the second compression exhaust pipe (43).