Multi-split system

Abstract

The utility model discloses a multi-split air conditioning system which comprises an outdoor unit flow path, an indoor unit flow path and a heat exchange tail end, and the indoor unit flow path and the heat exchange tail end are arranged between the output end and the input end of the outdoor unit flow path in parallel. According to the multi-split air conditioner system, the heat exchange tail end connected with the flow path of the indoor unit in parallel is additionally arranged in the multi-split air conditioner system, when the flow path of the indoor unit needs low-load operation, redundant media provided by the flow path of the outdoor unit are distributed, and therefore the noise problem caused by uneven distribution of refrigerants of the indoor unit is avoided.

Description

Technical Field

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

[0002] A multi-split air conditioning unit usually includes at least one outdoor unit and multiple indoor units. It can use one outdoor unit to transport refrigerant to several indoor units, and meet the indoor cooling and heating load requirements in a timely manner by controlling the refrigerant circulation volume of the compressor and the refrigerant flow entering each heat exchanger.

[0003] The existing multi-split system is generally used in commercial places, and the system load is large. Since the existing outdoor unit has a large number of capacities, when the outdoor unit only drags one or several indoor units, there is excess performance and uneven distribution of refrigerant in the indoor units, resulting in obvious noise problems when the indoor units return liquid after starting up. Therefore, when the load of the existing multi-split system does not reach the specified load, it is usually not allowed to start. Utility Model Content

[0004] The main purpose of the embodiment of the utility model is to provide a multi-split system, aiming to improve the technical problem of uneven distribution of refrigerant in internal machines when the multi-split system is running at low load in the prior art.

[0005] The embodiment of the utility model provides a multi-link system, which includes:

[0006] Outdoor unit flow path;

[0007] An indoor unit flow path, including a plurality of indoor units connected in parallel;

[0008] Heat exchange end;

[0009] The indoor unit flow path and the heat exchange terminal are arranged in parallel between the output end and the input end of the outdoor unit flow path.

[0010] In some embodiments of the present invention, the multi-split system also includes a first throttle valve, which is arranged between the heat exchange end and the output end of the outdoor unit flow path, and the first throttle valve is used to adjust the medium flow rate entering the heat exchange end from the output end of the outdoor unit.

[0011] In some embodiments of the present invention, the multi-connected system also includes a control module and a temperature detection module, the control module is connected to the temperature detection module, the temperature detection module is used to monitor the temperature of the heat exchange end, the first throttle valve is connected to the control module, and the control module is used to control the opening of the first throttle valve according to the temperature information fed back by the temperature detection module.

[0012] In some embodiments of the present invention, the heat exchange end includes a plurality of first capillaries connected in parallel to each other, and the plurality of first capillaries are connected in parallel to form a capillary network.

[0013] In some embodiments of the present invention, the multi-split system further includes a storage cabinet, the heat exchange terminal is disposed in the storage cabinet, and the heat exchange terminal is used to adjust the temperature in the storage cabinet.

[0014] In some embodiments of the present invention, the multi-split system also includes a second throttle valve, the output end of the outdoor unit flow path is connected to one port of the second throttle valve, and the heat exchange end and the indoor unit flow path are connected in parallel to another port of the second throttle valve.

[0015] In some embodiments of the present invention, the multi-split system also includes a first stop valve, the output end of the outdoor unit flow path is connected to one port of the first stop valve, and the heat exchange end and the indoor unit flow path are connected in parallel to another port of the first stop valve.

[0016] In some embodiments of the present invention, the multi-split system further includes a second stop valve, the heat exchange end and the indoor unit flow path are connected in parallel to one port of the second stop valve, and the other port of the second stop valve is connected to the input end of the outdoor unit flow path.

[0017] In some embodiments of the utility model, the outdoor unit flow path includes a four-way valve, a compressor, a condenser and a gas-liquid separator, and the four-way valve has a first interface, a second interface, a third interface and a fourth interface;

[0018] The outlet of the compressor is connected to the first interface, the condenser is connected to the second interface, the inlet of the gas-liquid separator is connected to the third interface, and the outlet of the gas-liquid separator is connected to the inlet of the compressor;

[0019] The indoor unit flow path has a first port and a second port, the heat exchange end has a third port and a fourth port, the first port and the third port are connected in parallel to the condenser, and the second port and the fourth port are connected in parallel to the fourth port;

[0020] The four-way valve is configured to be switchable between a first state and a second state so that the multi-split system can be switched between a cooling mode and a heating mode;

[0021] When the multi-split system is in cooling mode, the medium flowing out of the compressor is supplied to the condenser, and after passing through the condenser, it is divided by the first port and the third port to enter the indoor unit flow path and the heat exchange end respectively, and then merged by the second port and the fourth port to enter the gas-liquid separator;

[0022] When the multi-split system is in heating mode, the medium flowing out of the compressor is distributed and flows through the second port and the fourth port, and then is divided into the indoor unit flow path and the heat exchange end, and then merges with the first port and the third port to flow into the condenser, and then flows out of the condenser and enters the gas-liquid separator.

[0023] In some embodiments of the utility model, the multi-split system also includes a bypass noise reduction branch, the input port of the bypass noise reduction branch is connected to the condenser, the input port of the bypass noise reduction branch is also connected to the first port and the third port, the output port of the bypass noise reduction branch is connected to the gas-liquid separator, and a capillary device is arranged in the bypass noise reduction branch.

[0024] An embodiment of the utility model provides a multi-split system, which includes an outdoor unit flow path, an indoor unit flow path and a heat exchange terminal, wherein the indoor unit flow path and the heat exchange terminal are arranged in parallel between the output end and the input end of the outdoor unit flow path; that is, by adding a heat exchange terminal in parallel with the indoor unit flow path in the multi-split system, when the indoor unit flow path needs to operate at a low load, the excess medium provided by the outdoor unit flow path is distributed, thereby avoiding the noise problem caused by uneven distribution of the indoor unit refrigerant. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of medium flow in a refrigeration mode of a multi-split system according to an embodiment of the utility model;

[0027] Figure 2 A schematic diagram of medium flow in a heating mode of a multi-split system according to an embodiment of the utility model;

[0028] Figure 3 It is a schematic diagram of the medium flow direction in the refrigeration mode of the multi-split system of the second embodiment of the utility model.

[0029] Figure numerals: 10, outdoor unit flow path; 20, heat exchange end; 30, indoor unit flow path; 40, bypass noise reduction branch; 100, compressor; 200, condenser; 300, gas-liquid separator; 400, four-way valve; 500. First throttle valve; 600, second throttle valve; 700, first stop valve; 800, second stop valve. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0034] like Figure 1-3 As shown, the utility model provides a multi-split system, including an outdoor unit flow path 10, an indoor unit flow path 30 and a heat exchange terminal 20, wherein the indoor unit flow path 30 includes a plurality of indoor units connected in parallel. The indoor unit flow path 30 and the heat exchange terminal 20 are arranged in parallel between the output end and the input end of the outdoor unit flow path 10.

[0035] Specifically, the input end of the indoor unit flow path 30 and the input end of the heat exchange terminal 20 are connected in parallel to the output end of the outdoor unit flow path 10, and the output end of the heat exchange terminal 20 and the output end of the heat exchange terminal 20 are connected in parallel to the input end of the outdoor unit flow path 10.

[0036] It is understandable that by adding a medium energy consumption flow path, namely the heat exchange terminal 20, in parallel with the indoor unit flow path 30 in the multi-split system, when the indoor unit flow path 30 needs to operate at a low load, the excess medium provided by the outdoor unit flow path 10 is distributed, thereby avoiding the noise problem caused by the uneven distribution of the indoor unit refrigerant. In addition, when the load demand is low, the multi-split system can only open some of the indoor units. At this time, on the one hand, the heat exchange terminal 20 can be used to divert part of the refrigerant to avoid the refrigerant concentrating on some indoor units and causing a large noise problem. On the other hand, when the cooling capacity provided by the system exceeds the load demand of the opened indoor unit, the excess cooling capacity can be stored or consumed through the heat exchange terminal 20, thereby improving the utilization rate of cooling capacity and the energy efficiency of the system.

[0037] In some embodiments, the multi-split system also includes a first throttle valve 500, which is arranged between the heat exchange terminal 20 and the output end of the outdoor unit flow path 10, and the first throttle valve 500 is used to adjust the medium flow rate entering the heat exchange terminal 20 from the output end of the outdoor unit flow path 10.

[0038] It can be understood that by controlling the opening of the first throttle valve 500, the flow rate of the refrigerant medium output from the outdoor unit flow path 10 into the indoor unit flow path 30 and the heat exchange terminal 20 is controlled. If the opening of the first throttle valve 500 increases, the flow rate of the refrigerant medium output from the outdoor unit flow path 10 into the heat exchange terminal 20 increases, and the flow rate into the indoor unit flow path 30 decreases. That is, by controlling the opening of the first throttle valve 500, the flow distribution of the outdoor unit flow path 10 into the indoor unit flow path 30 and the heat exchange terminal 20 is controlled, and when the load of the indoor unit flow path 30 is small, the heat exchange terminal 20 takes away more medium, thereby avoiding the excess medium from flowing into the indoor unit flow path 30, resulting in uneven distribution of the indoor unit refrigerant.

[0039] In some embodiments, the multi-connected system also includes a control module and a temperature detection module. The control module is connected to the temperature detection module, and the temperature detection module is used to monitor the temperature of the heat exchange end 20. The first throttle valve 500 is connected to the control module, and the control module is used to control the opening of the first throttle valve 500 according to the temperature information fed back by the temperature detection module.

[0040] It can be understood that, in the cooling mode, the temperature of the heat exchange end 20 is controlled by adjusting the opening of the first throttle valve 500 .

[0041] In some embodiments, the heat exchange end 20 includes a plurality of first capillaries connected in parallel to each other, and the plurality of first capillaries are connected in parallel to form a capillary network.

[0042] In some embodiments, the multi-split system further includes a storage cabinet, and the heat exchange terminal 20 is disposed in the storage cabinet. The heat exchange terminal 20 is used to adjust the temperature in the storage cabinet.

[0043] It is understandable that the heat exchange terminal 20 can receive the cooling / heating medium of the outdoor unit flow path 10, so as to perform heat exchange in the storage cabinet, and then adjust the internal temperature of the storage cabinet so that the interior of the storage cabinet has a better storage temperature.

[0044] In some embodiments, the capillary network is disposed on the inner wall of the storage cabinet.

[0045] In some embodiments, the multi-split system further includes a storage cabinet, and the heat exchange terminal is disposed in the storage cabinet, and the heat exchange terminal is used to adjust the temperature in the storage cabinet.

[0046] In some embodiments, the multi-split system also includes a second throttle valve 600, the output end of the outdoor unit flow path 10 is connected to one port of the second throttle valve 600, and the heat exchange terminal 20 and the indoor unit flow path 30 are connected in parallel to another port of the second throttle valve 600.

[0047] In some embodiments, the multi-split system further includes a first stop valve 700 , the output end of the outdoor unit flow path 10 is connected to one port of the first stop valve 700 , and the heat exchange terminal 20 and the indoor unit flow path 30 are connected in parallel to another port of the first stop valve 700 .

[0048] In some embodiments, the multi-split system further includes a second stop valve 800 , the heat exchange terminal 20 and the indoor unit flow path 30 are connected in parallel to one port of the second stop valve 800 , and the other port of the second stop valve 800 is connected to the input end of the outdoor unit flow path 10 .

[0049] In some embodiments, the outdoor unit flow path 10 includes a four-way valve 400, a compressor 100, a condenser 200 and a gas-liquid separator 300, and the four-way valve 400 has a first interface, a second interface, a third interface and a fourth interface. The outlet of the compressor 100 is connected to the first interface, the condenser 200 is connected to the second interface, the inlet of the gas-liquid separator 300 is connected to the third interface, and the outlet of the gas-liquid separator 300 is connected to the inlet of the compressor 100.

[0050] The indoor unit flow path 30 has a first port and a second port, the heat exchange terminal 20 has a third port and a fourth port, the first port and the third port are connected in parallel to the condenser 200, and the second port and the fourth port are connected in parallel to the fourth port.

[0051] The four-way valve 400 is configured to switch between a first state and a second state to change the flow direction of the medium flowing out of the outlet of the compressor 100, thereby changing the working mode of the multi-split system. For example, when the four-way valve 400 is in the first state, the multi-split system is in a cooling mode; when the four-way valve 400 is in the second state, the multi-split system is in a heating mode. When the four-way valve 400 is in the first state, the first interface is connected to the second interface, and the third interface is connected to the fourth interface; when the four-way valve 400 is in the second state, the first interface is connected to the fourth interface, and the second interface is connected to the third interface.

[0052] When the multi-split system is in cooling mode, the medium flowing out of the compressor 100 is supplied to the condenser 200, and after passing through the condenser 200, it is divided by the first port and the third port to enter the indoor unit flow path 30 and the heat exchange terminal 20 respectively, and then merged by the second port and the fourth port to enter the gas-liquid separator 300.

[0053] That is, when the multi-split unit is in cooling mode, the medium flowing out of the compressor 100 first enters the condenser 200 for condensation, then enters the indoor unit flow path 30 and the heat exchange terminal 20, then merges with the indoor unit flow path 30 and the heat exchange terminal 20 and flows into the gas-liquid separator 300, and finally flows out of the gas-liquid separator 300 and enters the compressor 100.

[0054] When the multi-split system is in heating mode, the medium flowing out of the compressor 100 is distributed through the second port and the fourth port and then divided into the indoor unit flow path 30 and the heat exchange terminal 20, and then merged into the condenser 200 from the first port and the third port, and then flows into the gas-liquid separator 300 after flowing out of the condenser 200.

[0055] That is, when the multi-split unit is in cooling mode, the medium flowing out of the compressor 100 first enters the indoor unit flow path 30 and the heat exchange terminal 20, then enters the condenser 200 from the indoor unit flow path 30 and the heat exchange terminal 20, then enters the gas-liquid separator 300 from the condenser 200, and finally enters the compressor 100 from the gas-liquid separator 300.

[0056] It can be understood that in the above embodiment, the output end of the outdoor unit flow path 10 is changed by the four-way valve 400. That is, the outlet of the condenser 200 in the cooling mode is used as the output end of the outdoor unit flow path 10, and in the heating mode, the outlet of the compressor 100 is used as the output end of the outdoor unit flow path 10; the inlet of the gas-liquid separator 300 in the cooling mode is used as the input end of the outdoor unit flow path 10, and in the heating mode, the inlet of the condenser 200 is used as the input end of the outdoor unit flow path 10.

[0057] In some embodiments, the heat exchange end 20 further includes a first throttle valve 500 , the input port of the capillary network is connected to one port of the first throttle valve 500 , and the other port of the first throttle valve 500 is connected to the condenser 200 .

[0058] It is understandable that in cooling mode, if the heat exchange terminal 20 diverts too much refrigerant from the outdoor unit flow path 10 , the first throttle valve 500 can be closed so that all the refrigerant flows into the indoor unit flow path 30 .

[0059] At the same time, in the cooling mode, by adjusting the opening of the first throttle valve 500, the temperature and flow rate of the medium entering the heat exchange end 20 can also be adjusted; at the same time, the first throttle valve 500 can also adjust the temperature and flow rate of the medium flowing out of the heat exchange end 20 in the heating mode.

[0060] In some embodiments, the multi-split system further includes a second throttle valve 600 , the condenser 200 is connected to one port of the second throttle valve 600 , and the first port and the third port are connected in parallel to another port of the second throttle valve 600 .

[0061] It can be understood that by adjusting the opening of the second throttle valve 600, the temperature and flow rate of the medium entering the indoor unit flow path 30 and the heat exchange terminal 20 can be adjusted in the cooling mode.

[0062] In some embodiments, the multi-split system further includes a first stop valve 700 , the condenser 200 is connected to one port of the first stop valve 700 , and the first port and the third port are connected in parallel to another port of the first stop valve 700 .

[0063] It should be noted that the first stop valve 700 is located between the second throttle valve 600 and the first port and the third port, that is, one port of the first stop valve 700 is connected to one port of the second throttle valve 600, and the first port and the third port are connected in parallel to the other port of the first stop valve 700.

[0064] In some embodiments, the multi-connection system further includes a second stop valve 800 , the second port and the fourth port are connected in parallel to one port of the second stop valve 800 , and the other port of the second stop valve 800 is connected to the four-way valve 400 .

[0065] It can be understood that the first stop valve 700 and the second stop valve 800 are both used to control the opening and closing of the indoor unit flow path 30 and the heat exchange terminal 20 .

[0066] In some embodiments, the multi-split system also includes a bypass noise reduction branch 40, the input port of the bypass noise reduction branch 40 is connected to the condenser 200, the input port of the bypass noise reduction branch 40 is also connected to the first port and the third port, the output port of the bypass noise reduction branch 40 is connected to the gas-liquid separator 300, and a capillary device is arranged in the bypass noise reduction branch 40.

[0067] In some embodiments, the input port of the bypass noise reduction branch 40 is connected to one port of the second throttle valve 600, the other port of the second throttle valve 600 is connected to the condenser 200, the input port of the bypass noise reduction branch 40 is also connected to the first port and the second port, and the output port of the bypass noise reduction branch 40 is connected to the inlet of the gas-liquid separator 300.

[0068] It can be understood that the bypass noise reduction branch 40 serves to share the excess performance of the indoor unit flow path 30 at low load to a certain extent. The capillary tube device can be a capillary tube.

[0069] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the application concept of the present invention, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A multi-connection system, characterized in that: include: Outdoor unit flow path; An indoor unit flow path, including a plurality of indoor units connected in parallel; Heat exchange end; The indoor unit flow path and the heat exchange terminal are arranged in parallel between the output end and the input end of the outdoor unit flow path.

2. The multi-connection system according to claim 1, characterized in that: The multi-split system also includes a first throttle valve, which is arranged between the heat exchange end and the output end of the outdoor unit flow path, and the first throttle valve is used to adjust the medium flow rate from the output end of the outdoor unit into the heat exchange end.

3. The multi-connection system according to claim 2, characterized in that: The multi-connected system also includes a control module and a temperature detection module. The control module is connected to the temperature detection module, and the temperature detection module is used to monitor the temperature of the heat exchange end. The first throttle valve is connected to the control module, and the control module is used to control the opening of the first throttle valve according to the temperature information fed back by the temperature detection module.

4. The multi-connection system according to claim 1, characterized in that: The heat exchange end includes a plurality of first capillaries connected in parallel to each other, and the plurality of first capillaries are connected in parallel to form a capillary network.

5. The multi-connection system according to any one of claims 1 to 4, characterized in that: The multi-split system further includes a storage cabinet, the heat exchange terminal is arranged in the storage cabinet, and the heat exchange terminal is used to adjust the temperature in the storage cabinet.

6. The multi-connection system according to claim 1, characterized in that: The multi-split system also includes a second throttle valve, the output end of the outdoor unit flow path is connected to one port of the second throttle valve, and the heat exchange end and the indoor unit flow path are connected in parallel to another port of the second throttle valve.

7. The multi-connection system according to claim 1, characterized in that: The multi-split system further includes a first stop valve, the output end of the outdoor unit flow path is connected to one port of the first stop valve, and the heat exchange end and the indoor unit flow path are connected in parallel to another port of the first stop valve.

8. The multi-connection system according to claim 1, characterized in that: The multi-split system further includes a second stop valve, the heat exchange end and the indoor unit flow path are connected in parallel to one port of the second stop valve, and the other port of the second stop valve is connected to the input end of the outdoor unit flow path.

9. The multi-connection system according to claim 1, characterized in that: The outdoor unit flow path includes a four-way valve, a compressor, a condenser and a gas-liquid separator, and the four-way valve has a first interface, a second interface, a third interface and a fourth interface; The outlet of the compressor is connected to the first interface, the condenser is connected to the second interface, the inlet of the gas-liquid separator is connected to the third interface, and the outlet of the gas-liquid separator is connected to the inlet of the compressor; The indoor unit flow path has a first port and a second port, the heat exchange end has a third port and a fourth port, the first port and the third port are connected in parallel to the condenser, and the second port and the fourth port are connected in parallel to the fourth port; The four-way valve is configured to be switchable between a first state and a second state so that the multi-split system can be switched between a cooling mode and a heating mode; When the multi-split system is in cooling mode, the medium flowing out of the compressor is supplied to the condenser, and after passing through the condenser, it is divided by the first port and the third port to enter the indoor unit flow path and the heat exchange end respectively, and then merged by the second port and the fourth port to enter the gas-liquid separator; When the multi-split system is in heating mode, the medium flowing out of the compressor is distributed and flows through the second port and the fourth port, and then is divided into the indoor unit flow path and the heat exchange end, and then merges with the first port and the third port to flow into the condenser, and then flows out of the condenser and enters the gas-liquid separator.

10. The multi-connection system according to claim 9, characterized in that: The multi-split system also includes a bypass noise reduction branch, the input port of the bypass noise reduction branch is connected to the condenser, the input port of the bypass noise reduction branch is also connected to the first port and the third port, the output port of the bypass noise reduction branch is connected to the gas-liquid separator, and a capillary device is arranged in the bypass noise reduction branch.

Images