Refrigerating system and refrigerating equipment

Abstract

The utility model relates to the technical field of refrigeration, and discloses a refrigeration system which comprises a main heat exchange loop, a main heat exchange loop and an auxiliary heat exchange loop. The auxiliary heat exchange branch comprises a third heat exchanger; the first branch end of the auxiliary heat exchange branch is connected to an exhaust port of the compressor through the first switching module, and the second branch end of the auxiliary heat exchange branch is connected to a refrigerant pipeline between the first heat exchanger and the second heat exchanger. The first switching module is provided with a first connector connected with the first branch end of the auxiliary heat exchange branch, a second connector connected with an exhaust port of the compressor and a third connector connected with an air return port of the compressor. Wherein the first switching module at least comprises two switching states which enable two interfaces of the first switching module to be communicated and the other interface to be blocked. According to the embodiment of the utility model, multiple functions such as single refrigeration, single heating, double refrigeration, double heating, refrigeration and heating, outdoor unit defrosting and the like can be switched by adjusting the pipeline communication state of the first switching module. The invention further discloses the refrigeration equipment.

Description

Technical Field

[0001] This application relates to the field of refrigeration technology, such as a refrigeration system and refrigeration equipment. Background Technology

[0002] Conventional air conditioning products are divided into various types such as wall-mounted air conditioners, floor-standing air conditioners, central air conditioners, and multi-split air conditioners. These types of air conditioning products can meet the needs of cooling, heating, and dehumidifying the indoor environment. However, these functions only use air as the object of regulation. Therefore, the application scenarios of conventional air conditioners are limited to the scope of optimizing the temperature and humidity of the environment, and cannot meet some special user needs, such as using the heat of the air conditioning refrigerant to produce domestic hot water or indoor heating.

[0003] In light of the above, relevant manufacturers have developed a product that combines the refrigeration system of a conventional air conditioner with a hot water tank, thus providing both air conditioning and hot water production functions. Figure 1 The diagram shows a flow path of an air conditioning refrigeration circuit integrated with a hot water tank in the prior art. The hot water tank includes a water tank for holding hot water and an auxiliary heat exchanger 20 for exchanging heat with the water. The auxiliary heat exchanger 20 is connected in parallel to the air conditioning refrigeration circuit. Specifically, the two ends of the auxiliary heat exchanger 20 are respectively connected to the two ends of the indoor heat exchanger 10 of the refrigeration circuit. In this way, when the refrigeration circuit transports refrigerant in a heating cycle, a portion of the high-temperature refrigerant can be diverted to the auxiliary heat exchanger 20, so that the heat of this portion of high-temperature refrigerant can be used to heat the water in the water tank to produce hot water for the user's daily consumption.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] The existing system described above, while capable of providing both air conditioning and hot water supply, still suffers from limitations imposed by the air conditioning operating mode. For instance, when the air conditioning refrigeration circuit delivers refrigerant according to the refrigeration cycle direction, the auxiliary heat exchanger receives low-temperature refrigerant, rendering this system incapable of producing hot water under refrigeration conditions. Therefore, such products still require technological improvements to overcome the limitations of different air conditioning modes and adapt to various operating scenarios.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides a refrigeration system and refrigeration equipment to solve the technical problem of limited application scenarios in the integrated form of refrigeration circuit and hot water supply device (or heater) in related technologies.

[0009] According to an embodiment of the first aspect of this application, a refrigeration system is provided, comprising:

[0010] The main heat exchange circuit includes a compressor, a first heat exchanger, and a second heat exchanger connected in sequence.

[0011] The secondary heat exchange branch includes a third heat exchanger; the first branch end of the secondary heat exchange branch is connected to the compressor's exhaust port through a first switching module, and the second branch end is connected to the refrigerant pipeline between the first heat exchanger and the second heat exchanger.

[0012] The first switching module has a first interface connecting to the first branch end of the auxiliary heat exchange branch, a second interface connecting to the exhaust port of the compressor, and a third interface connecting to the return port of the compressor; wherein the first switching module includes at least two switching states that connect two interfaces and block the other interface.

[0013] In some alternative embodiments, the first switching module includes a first three-way valve having a first valve port as a first interface, a second valve port as a second interface, and a third valve port as a third interface; or,

[0014] The first switching module includes a first sub-branch and a second sub-branch. The first sub-branch is connected between the first branch end and the compressor's exhaust port, and the second sub-branch is connected between the first branch end and the compressor's return port. The first switching module also includes a first valve disposed in the first sub-branch and a second valve disposed in the second sub-branch. Alternatively,

[0015] The first switching module includes a first sub-branch and a second sub-branch. The first sub-branch is connected between the first branch end and the compressor's exhaust port, and the second sub-branch is connected between the first branch end and the compressor's return port. The first switching module also includes a first valve disposed on the first sub-branch, a second valve disposed on the second sub-branch, and a third valve disposed on the first branch end.

[0016] In some optional embodiments, the first switching module includes at least the following two switching states:

[0017] In the first switching state, the first interface of the first switching module is connected to the second interface, and the third interface is blocked.

[0018] In the second switching state, the first interface of the first switching module is connected to the third interface, and the second interface is blocked.

[0019] In the third switching state, the second and third interfaces of the first switching module are connected, while the first interface is blocked.

[0020] In some alternative embodiments, the main heat exchange branch further includes a main throttling element disposed on the refrigerant pipeline between the second heat exchanger and the first heat exchanger;

[0021] The second branch of the secondary heat exchange branch is connected between the first heat exchanger and the main throttling element.

[0022] In some alternative embodiments, the secondary heat exchange branch also includes a secondary throttling element disposed on the refrigerant pipeline between the third heat exchanger and the second branch end.

[0023] In some alternative embodiments, the main heat exchange branch further includes a main throttling element disposed on the refrigerant pipeline between the second heat exchanger and the first heat exchanger;

[0024] The secondary heat exchange branch also includes a second switching module, which has a fourth interface connecting the second branch end of the secondary heat exchange branch, a fifth interface connecting the first heat exchanger and the main throttling element, and a sixth interface connecting the second heat exchanger and the main throttling element.

[0025] The second switching module includes at least a first bypass state and a second bypass state. In the first bypass state, the fourth interface and the fifth interface are connected and the sixth interface is blocked. In the second bypass state, the fourth interface and the sixth interface are connected and the fifth interface is blocked.

[0026] In some alternative embodiments, the second switching module includes a second three-way valve having a fourth valve port as a fourth interface, a fifth valve port as a fifth interface, and a sixth valve port as a sixth interface; or,

[0027] The second switching module includes a third sub-branch and a fourth sub-branch. One end of the third sub-branch is connected to the end of the second branch, and the other end is connected between the first heat exchanger and the main throttling element. One end of the fourth sub-branch is connected to the end of the second branch, and the other end is connected between the second heat exchanger and the main throttling element. The second switching module also includes a fourth valve disposed on the third sub-branch and a fifth valve disposed on the fourth sub-branch.

[0028] In some alternative embodiments, the third heat exchanger is at least one of the following types: water-cooled refrigerant heat exchanger, air-cooled refrigerant heat exchanger, and solar collector.

[0029] In some alternative embodiments, the secondary heat exchange branch also includes a liquid storage control valve, which is located on the refrigerant pipeline between the third heat exchanger and the first branch end.

[0030] In some alternative embodiments, the main heat exchange branch also includes a main control valve, which is located on the refrigerant pipeline between the first heat exchanger and the second branch end.

[0031] According to an embodiment of the second aspect of this application, a refrigeration device is provided, comprising:

[0032] Equipment body; and

[0033] The refrigeration system as described in any of the embodiments of the first aspect above.

[0034] The refrigeration system and refrigeration equipment provided in this disclosure can achieve the following technical effects:

[0035] The refrigeration system in this embodiment includes a main heat exchange circuit for basic refrigeration and a secondary heat exchange branch for supplying hot water, heating, and other functions. One end of the secondary heat exchange branch is connected to the compressor exhaust side of the main heat exchange circuit via a first switching module, and the other end is connected between the first and second heat exchangers of the main heat exchange circuit. By adjusting the pipeline connection state of the first switching module, the refrigeration system can have multiple functions such as single refrigeration, single heating, dual refrigeration, dual heating, refrigeration + heating, and outdoor unit defrosting, meeting the usage requirements of the refrigeration system under different operating conditions.

[0036] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0037] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0038] Figure 1 This is a schematic diagram of the flow path of a system integrating an air conditioning refrigeration circuit and a hot water tank in the prior art;

[0039] Figure 2 This is a schematic diagram of the structure of a refrigeration system provided in an embodiment of the present disclosure;

[0040] Figure 3 This is a schematic diagram of the structure of a refrigeration system provided in yet another embodiment of this disclosure;

[0041] Figure 4 This is a schematic diagram of the structure of a refrigeration system provided in yet another embodiment of this disclosure;

[0042] Figure 5 This is a schematic diagram of the structure of a refrigeration system provided in yet another embodiment of this disclosure;

[0043] Figure 6 This is a schematic diagram of the flow path of the refrigeration system provided in the embodiments of this disclosure in "single refrigeration" mode;

[0044] Figure 7 This is a schematic diagram of the flow path of the refrigeration system in "dual refrigeration" mode provided in the embodiments of this disclosure;

[0045] Figure 8 This is a schematic diagram of the flow path of the refrigeration system in "refrigeration + heating" mode provided in the embodiments of this disclosure;

[0046] Figure 9 This is a schematic diagram of the flow path of the refrigeration system provided in the embodiments of this disclosure in "single heating" mode;

[0047] Figure 10 This is a schematic diagram of the flow path of the refrigeration system in "dual heating" mode provided in the embodiments of this disclosure;

[0048] Figure 11 This is a schematic diagram of the flow path of the refrigeration system in "defrost" mode according to an embodiment of this disclosure;

[0049] Figure 12 This is a schematic diagram of the flow path of the refrigeration system in "low load" mode according to an embodiment of this disclosure;

[0050] Figure 13 This is a schematic diagram of the structure of a refrigeration system provided in yet another embodiment of this disclosure;

[0051] Figure 14 This is a schematic flowchart of a control method for a refrigeration system provided in an embodiment of the present disclosure.

[0052] Prior art reference numerals:

[0053] 10. Indoor heat exchanger; 20. Auxiliary heat exchanger.

[0054] Reference numerals in the attached drawings of this application:

[0055] 100. Main heat exchange circuit; 110. Compressor; 111. Exhaust port; 112. Return port; 120. First heat exchanger; 130. Second heat exchanger; 140. Four-way valve; 150. Main throttling element; 160. Main control valve;

[0056] 200, Secondary heat exchange branch; 210, Third heat exchanger; 221, First branch end; 222, Second branch end; 230, Secondary throttling element; 240, Liquid storage control valve;

[0057] 300. First switching module; 310. First three-way valve; 311. First valve port; 312. Second valve port; 313. Third valve port; 321. First sub-branch; 322. Second sub-branch; 323. First valve; 324. Second valve; 325. Third valve;

[0058] 400, Second switching module; 410, Second three-way valve; 411, Fourth valve port; 412, Fifth valve port; 413, Sixth valve port; 421, Third sub-branch; 422, Fourth sub-branch; 423, Fourth valve; 424, Fifth valve. Detailed Implementation

[0059] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0060] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0061] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0062] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0063] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0064] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0065] This application discloses a refrigeration system that can be used as an energy supply component in refrigeration equipment. Specifically, it can be used to supply cooling capacity to the target object of the refrigeration equipment under cooling conditions, or to supply heat to the target object of the refrigeration equipment under heating conditions, or to supply cooling capacity and heat to different target objects separately under combined conditions. Optionally, the types of refrigeration equipment used include, but are not limited to, air conditioners, refrigerators, dehumidifiers, etc.

[0066] The specific configuration of the refrigeration system of this application will be described in detail below with reference to some optional embodiments. Here, the refrigeration equipment used in the refrigeration system in the following embodiments is an air conditioner that integrates the function of producing hot water.

[0067] Combination Figures 2 to 5 As shown in the figure, this disclosure provides a refrigeration system, which includes at least a main heat exchange circuit 100, a secondary heat exchange branch 200, and a first switching module 300. The main heat exchange circuit 100 is primarily used for air conditioning, providing cooling and heating to the indoor environment to meet user comfort requirements. The secondary heat exchange branch 200 is primarily used for hot water production, providing domestic hot water and heating water to meet user needs for hot water supply for kitchen washing, showering, and room heating. The first switching module 300 connects the main heat exchange circuit 100 and the secondary heat exchange branch 200, enabling connectivity between their flow paths. Specifically, the first switching module 300 controls the switching of the flow paths between the main heat exchange circuit 100 and the secondary heat exchange branch 200, thereby controlling the actual number and direction of the refrigerant flow paths in the refrigeration system to adapt to different functional requirements under different operating conditions.

[0068] Specifically, such as Figures 2 to 5As shown, the main heat exchange circuit 100 mainly includes a compressor 110, a first heat exchanger 120 and a second heat exchanger 130 connected in sequence.

[0069] For air conditioner products, compressor 110 and first heat exchanger 120 are located on the outdoor side and serve as the outdoor unit of the refrigeration system. Here, compressor 110 is used to compress refrigerant, thereby compressing low-temperature, low-pressure refrigerant gas into high-temperature, high-pressure refrigerant liquid. First heat exchanger 120 is used as an "outdoor heat exchanger," which can exchange heat with the outdoor environment. For example, when the main heat exchange circuit 100 supplies refrigerant according to the refrigeration cycle, first heat exchanger 120 acts as a "condenser" and releases refrigerant heat to the outdoor environment. When the main heat exchange circuit 100 supplies refrigerant according to the heating cycle, first heat exchanger 120 acts as an "evaporator" and absorbs ambient heat from the outdoor environment. The second heat exchanger 130 is located on the indoor side and serves as part of the indoor unit of the refrigeration system. In this embodiment, the second heat exchanger 130 is used as an "indoor heat exchanger" and can exchange heat with the indoor environment. For example, when the main heat exchange circuit 100 supplies refrigerant according to the refrigeration cycle, the second heat exchanger 130 acts as an "evaporator" and absorbs ambient heat from the indoor environment. When the main heat exchange circuit 100 supplies refrigerant according to the heating cycle, the second heat exchanger 130 acts as a "condenser" and releases heat to the indoor environment.

[0070] In this embodiment, the main heat exchange circuit 100 also includes a four-way valve 140, which can be used to control the refrigerant flow direction of the main heat exchange circuit 100, and specifically can control the main heat exchange circuit 100 to switch between two flow directions: refrigeration cycle and heating cycle. Here, the four-way valve 140 includes valve port a, valve port b, valve port c, and valve port d, wherein valve port a is connected to the exhaust port 111 side of the compressor 110, valve port b is connected to one end of the first heat exchanger 120, valve port c is connected to the suction port side of the compressor 110, and valve port d is connected to one end of the second heat exchanger 130.

[0071] Here, the four-way valve 140 includes a first valve 323 state corresponding to the refrigeration cycle flow direction and a second valve 324 state corresponding to the heating cycle flow direction. When the four-way valve 140 is switched to the first valve 323 state, valve port a and valve port b of the four-way valve 140 are connected, and valve port c and valve port d are connected. When the four-way valve 140 is switched to the second valve 324 state, valve port a and valve port d of the four-way valve 140 are connected, and valve port b and valve port c are connected.

[0072] In this embodiment, the main heat exchange circuit 100 also includes a main throttling element 150, which is disposed on the refrigerant pipeline between the second heat exchanger 130 and the first heat exchanger 120. It can be used to throttle the medium-temperature and medium-pressure refrigerant from the "condenser" side into a low-temperature and low-pressure refrigerant and deliver it to the "evaporator" side.

[0073] Combination Figures 2 to 5 As shown, the secondary heat exchange branch 200 includes a third heat exchanger 210. In this embodiment, the third heat exchanger 210 is a component used to realize heat exchange between water and refrigerant, that is, its type is a water-refrigerant heat exchanger. In this embodiment, the refrigeration equipment used in the refrigeration system also includes a water tank. The third heat exchanger 210 of the secondary heat exchange branch 200 is housed in the water tank, and the refrigerant flowing through the third heat exchanger 210 can exchange heat with the water stored in the water tank, thereby realizing the purpose of preparing hot water using the temperature of the refrigerant.

[0074] In this embodiment, the secondary heat exchange branch 200 has a first branch end 221 and a second branch end 222. Here, the first branch end 221 is connected to the exhaust port 111 of the compressor 110 via the first switching module 300, as shown below. Figure 2 The first branch end 221 shown is connected to the refrigerant pipeline between the exhaust port 111 of the compressor 110 and port a of the four-way valve 140; the second branch end 222 is connected to the refrigerant pipeline between the first heat exchanger 120 and the second heat exchanger 130. Here, the first branch end 221 is connected to the high-pressure refrigerant side of the main heat exchange circuit 100, and serves as the liquid inlet port of the secondary heat exchange branch 200. The high-temperature refrigerant discharged from the compressor 110 can flow into the secondary heat exchange branch 200 through the first branch end 221, and then heat the water stored in the water tank to generate high-temperature hot water during the flow through the third heat exchanger 210; the second branch end 222 is connected to the low-pressure refrigerant side of the main heat exchange circuit 100, and serves as the liquid outlet port of the secondary heat exchange branch 200. The refrigerant after heat exchange through the third heat exchanger 210 can be reintegrated into the main heat exchange circuit 100 through the second branch end 222.

[0075] In several embodiments of this application, the first switching module 300 has a first interface, a second interface, and a third interface. The first interface is for connecting to the first branch end 221 of the secondary heat exchange branch 200, the second interface is for connecting to the exhaust port 111 of the compressor 110, and the third branch end is for connecting to the return port 112 of the compressor 110. The first switching module 300 includes at least two switching states that connect two interfaces while blocking the other. For example, in the first switching state, the first interface and the second interface of the first switching module 300 are connected, and the third interface is blocked; in the second switching state, the first interface and the third interface of the first switching module 300 are connected, and the second interface is blocked; in the third switching state, the second interface and the third interface of the first switching module 300 are connected, and the first interface is blocked.

[0076] Here, in the first switching state, the first branch end 221 of the auxiliary heat exchange branch 200 is directly connected to the exhaust port 111 of the compressor 110, while the return port 112 of the compressor 110 is not directly connected to either the auxiliary heat exchange branch 200 or the exhaust port 111 of the compressor 110. In this state, a portion of the high-temperature refrigerant discharged by the compressor 110 can flow into the auxiliary heat exchange branch 200 sequentially through the first interface and the second interface of the first switching module 300. At the same time, since the first branch end 221 of the auxiliary heat exchange branch 200 is connected in parallel between the exhaust port 111 of the compressor 110 and the a-port of the four-way valve 140, another portion of the high-temperature refrigerant discharged by the compressor 110 can still be transported along the flow direction defined by the main heat exchange circuit 100. That is, this portion of high-temperature refrigerant flows to the four-way valve 140 and is then guided to the first heat exchanger 120 (refrigeration cycle flow direction) or the second heat exchanger 130 (heating cycle flow direction) for heat exchange.

[0077] In the second switching state, the first branch end 221 of the auxiliary heat exchange branch 200 is directly connected to the return port 112 of the compressor 110, and the exhaust port 111 of the compressor 110 is not directly connected to the auxiliary heat exchange branch 200 or the return port 112 of the compressor 110. In this state, all the high-temperature refrigerant discharged by the compressor 110 flows to the four-way valve 140 and is guided to the first heat exchanger 120 or the second heat exchanger 130 for heat exchange. Meanwhile, since the second branch end 222 of the auxiliary heat exchange branch 200 is connected in parallel between the first heat exchanger 120 and the second heat exchanger 130, a portion of the refrigerant after heat exchange in the first heat exchanger 120 or the second heat exchanger 130 can flow into the auxiliary heat exchange branch 200 through the second branch end 222. This portion of refrigerant then undergoes heat exchange in the third heat exchanger 210, and subsequently flows back to the exhaust port 111 of the compressor 110 via the second branch end 222, the first port of the three-way valve, and the third port. In this state, the second branch end 222 of the auxiliary heat exchange branch 200 serves as the liquid inlet port, and the first branch end 221 serves as the liquid outlet port.

[0078] In the third switching state, the exhaust port 111 and return port 112 of the compressor 110 are directly connected. The first branch of the auxiliary heat exchange branch 200 is not directly connected to the exhaust port 111 and return port 112 of the compressor 110. In this state, a portion of the high-temperature refrigerant discharged by the compressor 110 can flow back to the return port 112 of the compressor 110 through the first interface and the third interface of the first switching module 300, thereby achieving the effect of replenishing gas and increasing enthalpy. In addition, another portion of the high-temperature refrigerant discharged by the compressor 110 can still be transported along the flow direction defined by the main heat exchange circuit 100. That is, this portion of high-temperature refrigerant flows to the four-way valve 140 and is then guided to the first heat exchanger 120 (refrigeration cycle flow direction) or the second heat exchanger 130 (heating cycle flow direction) for heat exchange.

[0079] Regarding the specific structural form of the first switching module 300, in some optional embodiments, the first switching module 300 includes a first three-way valve 310, and the first branch end 221 is connected to the main heat exchange circuit 100 through the first three-way valve 310. For example... Figure 2 As shown, the first three-way valve 310 has a first valve port 311, a second valve port 312 and a third valve port 313. The first valve port 311 serves as the aforementioned "first interface" and can be used to connect to the first branch end 221 of the auxiliary heat exchange branch 200. The second valve port 312 serves as the aforementioned "second interface" and can be used to connect to the exhaust port 111 of the compressor 110. The third valve port 313 serves as the aforementioned "third interface" and can be used to connect to the return port 112 of the compressor 110.

[0080] In this embodiment, optionally, the first three-way valve 310 includes the aforementioned first switching state and second switching state, and can switch between these two states. Alternatively, the first three-way valve 310 includes the aforementioned first switching state and third switching state, and can switch between these two states. Alternatively, the first three-way valve 310 includes the aforementioned second switching state and third switching state, and can switch between these two states. Alternatively, the first three-way valve 310 includes the aforementioned first switching state, second switching state, and third switching state, and can switch between these three states.

[0081] In some alternative embodiments, the first switching module 300 consists of two sub-branches and valves corresponding to each sub-branchose. Specifically, as shown in... Figure 3As shown, the first switching module 300 includes a first sub-branch 321 and a second sub-branch 322. The two ends of the first sub-branch 321 are respectively connected to the first branch end 221 of the auxiliary heat exchange branch 200 and the exhaust port 111 of the compressor 110, so that the flow paths of the first branch end 221 and the exhaust port 111 of the compressor 110 are connected. The two ends of the second sub-branch 322 are respectively connected to the first branch end 221 of the auxiliary heat exchange branch 200 and the return port 112 of the compressor 110, so that the first branch end 221 and the return port 112 of the compressor 110 are connected. Simultaneously, the first switching module 300 also includes a first valve 323 and a second valve 324. The first valve 323 is disposed on the first sub-branch 321 and can be used to control the on / off state of the first sub-branch 321. The second valve 324 is disposed on the second sub-branch 322 and can be used to control the on / off state of the second sub-branch 322. In the embodiment, the first sub-branch 321 and the second sub-branch 322 are connected in parallel to the port of the first branch end 221, which is equivalent to the "first interface" mentioned above. The port of the first sub-branch 321 that connects to the exhaust port 111 of the compressor 110 is the "second interface" mentioned above, and the port of the second sub-branch 322 that connects to the return port 112 of the compressor 110 is the "third interface" mentioned above.

[0082] In this embodiment, the first switching module 300 includes the aforementioned first switching state and second switching state, and can switch between the two states. Specifically, in the first switching state, the first valve 323 is in the open state and the second valve 324 is in the closed state; and in the second switching state, the first valve 323 is in the closed state and the second valve 324 is in the open state.

[0083] In some alternative embodiments, similar to the previous embodiment, the combination of Figure 3 As shown, the first switching module 300 also includes a first sub-branch 321, a second sub-branch 322, and a first valve 323 disposed on the first sub-branch 321 and a second valve 324 disposed on the second sub-branch 322. Additionally, the first switching module 300 also includes a third valve 325 disposed at the first branch end 221, which can be used to control the on / off state of the first branch end 221.

[0084] In this embodiment, the first switching module 300 includes the aforementioned first switching state, second switching state, and / or third state, and switches between at least two switching states. Specifically, in the first switching state, the first valve 323 is in the open state, the second valve 324 is in the closed state, and the third valve 325 is in the open state; in the second switching state, the first valve 323 is in the closed state, the second valve 324 is in the open state, and the third valve 325 is in the open state; and in the third switching state, the first valve 323 is in the open state, the second valve 324 is in the open state, and the third valve 325 is in the closed state.

[0085] In some of the embodiments shown above, combined with Figure 2 and Figure 3 As shown, the second branch end 222 of the secondary heat exchange branch 200 is connected between the first heat exchanger 120 and the main throttling element 150.

[0086] Optionally, with the main heat exchange branch flowing according to the refrigeration cycle direction and the first switching module 300 in the first switching state, a portion of the refrigerant discharged from the compressor 110 flows to the liquid inlet side of the main throttling device 150 after heat exchange via the auxiliary heat exchange branch 200. The other portion of the refrigerant discharged from the compressor 110 also flows to the liquid inlet side of the main throttling device 150 after heat exchange via the first heat exchanger 120. After the two portions of refrigerant merge, they are throttled by the main throttling device 150 and then flow to the second heat exchanger 130 for heat exchange. Therefore, this usage configuration can achieve both indoor cooling and hot water production functions.

[0087] In some other embodiments, the secondary heat exchange branch 200 further includes a secondary throttling element 230 disposed on the refrigerant pipeline between the third heat exchanger 210 and the second branch end 222. The secondary throttling element 230 can be used to throttle the refrigerant flowing through the secondary heat exchange branch 200.

[0088] Optionally, with the main heat exchange branch flowing according to the refrigeration cycle direction and the first switching module 300 in the first switching state, a portion of the refrigerant discharged from the compressor 110 is throttled by the secondary throttling device 230 after heat exchange in the secondary heat exchange branch 200, and then flows to the liquid inlet side of the main throttling device 150; the other portion of the refrigerant discharged from the compressor 110 is also merged into the liquid inlet side of the main throttling device 150 after heat exchange in the first heat exchanger 120. After the two portions of refrigerant merge, they are throttled by the main throttling device 150, and then flow to the second heat exchanger 130 for heat exchange. Therefore, this usage state can realize both indoor cooling and hot water preparation functions. Compared with the previous embodiment, the added secondary throttling device 230 can throttle the refrigerant flowing through the secondary heat exchange branch 200 once in advance, thereby enhancing the heat exchange efficiency of the refrigeration system.

[0089] Alternatively, with the main heat exchange branch flowing according to the heating cycle direction and the first switching module 300 in the first switching state, a portion of the refrigerant discharged from the compressor 110 is throttled by the secondary throttling device 230 after heat exchange in the secondary heat exchange branch 200, and then flows to the liquid inlet side of the first heat exchanger 120; the other portion of the refrigerant discharged from the compressor 110 is also merged into the liquid inlet side of the first heat exchanger 120 after heat exchange in the second heat exchanger 130, and the two portions of refrigerant enter the first heat exchanger 120 for heat exchange. Therefore, this usage mode can realize both indoor heating and hot water production functions.

[0090] In some of the embodiments shown above, combined with Figure 4 and Figure 5 As shown, the second branch end 222 of the secondary heat exchange branch 200 is connected in parallel to both ends of the main throttling element 150 through the second switching module 400, and the secondary heat exchange branch 200 can be selectively connected to one end of the main throttling element 150 using the second switching module 400. For example, the secondary heat exchange branch 200 can be selectively connected between the main throttling element 150 and the first heat exchanger 120, or the secondary heat exchange branch 200 can be selectively connected between the main throttling element 150 and the second heat exchanger 130.

[0091] Here, the second switching module 400 includes a fourth interface, a fifth interface, and a sixth interface. The fourth interface is connected to the second branch end 222 of the secondary heat exchange branch 200; the fifth interface is connected to the refrigerant pipeline between the first heat exchanger 120 and the main throttling device 150; and the sixth interface is connected to the refrigerant pipeline between the second heat exchanger 130 and the main throttling device 150. Furthermore, the second switching module 400 includes at least a first bypass state and a second bypass state. In the first bypass state, the fourth and fifth interfaces are connected, and the sixth interface is blocked, so that the second branch end 222 of the secondary heat exchange branch 200 is actually connected between the first heat exchanger 120 and the main throttling device 150. In the second bypass state, the fourth and sixth interfaces are connected, and the fifth interface is blocked, so that the second branch end 222 of the secondary heat exchange branch 200 is actually connected between the second heat exchanger and the main throttling device 150.

[0092] Specifically, regarding the specific structural form of the second switching module 400, in some optional embodiments, the second switching module 400 includes a second three-way valve 410, and the second branch end 222 is connected in parallel to both ends of the main throttling element 150 through the second three-way valve 410. For example... Figure 4As shown, the second three-way valve 410 has a fourth valve port 411, a fifth valve port 412, and a sixth valve port 413. The fourth valve port 411 serves as the aforementioned "fourth interface" and can be used to connect to the second branch end 222 of the auxiliary heat exchange branch 200. The fifth valve port 412 serves as the aforementioned "fifth interface" and can be used to connect to the refrigerant pipeline between the first heat exchanger 120 and the main throttling device 150. The sixth valve port 413 serves as the aforementioned "sixth interface" and can be used to connect to the refrigerant pipeline between the second heat exchanger 130 and the main throttling device 150.

[0093] In some alternative embodiments, the second switching module 400 consists of two sub-branches and valves corresponding to each sub-branchose. Specifically, as shown in... Figure 5 As shown, the second switching module 400 includes a third sub-branch 421 and a fourth sub-branch 422. The two ends of the third sub-branch 421 are respectively connected between the second branch end 222 of the auxiliary heat exchange branch 200, the first heat exchanger 120 and the main throttling device 150, so that the pipeline between the second branch end 222 and the first heat exchanger 120 and the main throttling device 150 is connected. The two ends of the third sub-branch 421 are respectively connected between the second branch end 222 of the auxiliary heat exchange branch 200, the second heat exchanger 130 and the main throttling device 150, so that the pipeline between the second branch end 222 and the second heat exchanger 130 and the main throttling device 150 is connected. Meanwhile, the second switching module 400 also includes a fourth valve 423 and a fifth valve 424. The fourth valve 423 is disposed on the third sub-branch 421 and can be used to control the on / off state of the third sub-branch 421. The fifth valve 424 is disposed on the fourth sub-branch 422 and can be used to control the on / off state of the fourth sub-branch 422. In the embodiment, the third sub-branch 421 and the fourth sub-branch 422 are connected in parallel to the port of the second branch end 222, which is equivalent to the "fourth interface" mentioned above. The port of the third sub-branch 421 that connects between the first heat exchanger 120 and the main throttling device 150 is the "fifth interface" mentioned above. The port of the fourth sub-branch 422 that connects between the second heat exchanger 130 and the main throttling device 150 is the "sixth interface" mentioned above.

[0094] In addition to the third heat exchanger 210, which is a "water-refrigerant heat exchanger" type used for preparing hot water or heating water as shown in the previous embodiments, the secondary heat exchange branch 200 can also serve as a flow path for air-cooled temperature regulation of the indoor environment. Therefore, the type of the third heat exchanger 210 can also be an "air-refrigerant heat exchanger". The third heat exchanger 210 can use the high-temperature refrigerant flowing through the secondary heat exchange branch 200 to heat the indoor ambient air, thereby playing an auxiliary heating role. Alternatively, the third heat exchanger 210 can use the low-temperature refrigerant flowing through the secondary heat exchange branch 200 to cool the indoor ambient air, thereby playing an auxiliary cooling role.

[0095] In some alternative embodiments, the third heat exchanger 210 is a type of heat exchanger integrated with photovoltaic solar energy modules. For example, the third heat exchanger 210 is a solar collector that can be integrated with components such as solar panels and can absorb solar heat to heat the refrigerant flowing through the third heat exchanger 210, thereby supplementing the circulating heat of the refrigeration system, improving the heat exchange efficiency of the refrigeration system, and reducing the power consumption cost.

[0096] In the preceding embodiments, since the main heat exchange circuit 100 and the secondary heat exchange branch 200 may be used simultaneously for dual heat exchange, or only one of them may be used for single heat exchange, the total amount of refrigerant filled in the refrigeration system is generally determined based on the amount of refrigerant required when both are used simultaneously. This necessitates storing excess refrigerant in the system during single heat exchange to reduce the impact of system pressure or compressor overload. Based on this situation, in this embodiment, the secondary heat exchange branch 200 can also serve as a flow path for refrigerant storage, thereby enabling dynamic control of the actual refrigerant circulation volume in the refrigeration system and maintaining system operational stability.

[0097] Specifically, the secondary heat exchange branch 200 also includes a liquid storage control valve 240, which is disposed on the secondary heat exchange branch 200 and located on the refrigerant pipeline between the third heat exchanger 210 and the first branch end 221. In this embodiment, the refrigerant pipeline of the secondary heat exchange branch 200 located between the liquid storage control valve 240 and the second branch end 222, especially the flow path portion including the third heat exchanger 210, is used as a flow path space for storing refrigerant. Here, the liquid storage control valve 240 can cooperate with the secondary throttling device 230 to open or close the liquid storage function. For example, when it is necessary to store refrigerant, the liquid storage control valve 240 can be opened and the secondary throttling device 230 can be closed, so that the refrigerant flows unidirectionally from the first branch end 221 into the secondary heat exchange branch 200 and accumulates and stores in the third heat exchanger 210. Then, the liquid storage control valve 240 is closed, so that the third heat exchanger 210 and its related flow paths can be constructed as a closed flow path storing refrigerant. Similarly, when it is necessary to release the stored excess refrigerant, the liquid storage control valve 240 and the secondary throttling device 230 can be controlled to open, so that the secondary heat exchange branch 200 is connected to the main heat exchange circuit 100, and the stored refrigerant can re-enter the refrigerant circulation.

[0098] Here, the advantage of using the secondary heat exchange branch 200 as a refrigerant storage container is that the second branch end 222 of the secondary heat exchange branch 200 is connected between the first heat exchanger 120 and the second heat exchanger 130 of the main heat exchange circuit 100. Since the refrigerant stored in the secondary heat exchange branch 200 is mostly in liquid form, during the refrigerant release process, this part of the liquid refrigerant must first enter the first heat exchanger 120 or the second heat exchanger 130 through the second branch end 222 for heat exchange before it can flow back to the compressor 110. During this process, the refrigerant always flows towards the heat exchanger that acts as an "evaporator" (for example, it flows towards the second heat exchanger 130 in the refrigeration cycle and towards the first heat exchanger 120 in the heating cycle). The liquid refrigerant can evaporate from liquid to gaseous form, thereby avoiding the "liquid slugging" problem caused by too much liquid refrigerant flowing back to the compressor 110, and ensuring the reliability and safety of the compressor 110 operation.

[0099] The following describes the operating modes that the refrigeration system of this application can achieve, with reference to some embodiments:

[0100] (a) "Single Cooling" mode, such as Figure 6 The refrigerant flow direction is indicated by the middle arrow. In this mode, only the second heat exchanger 130 of the main heat exchange circuit 100 is used to cool the indoor environment. Here, when the refrigeration system switches to the "single refrigeration" mode, the four-way valve 140 is controlled to switch to the first valve 323 state so that the main heat exchange circuit 100 operates according to the refrigeration cycle flow direction; and the secondary throttling element 230 and / or liquid storage solenoid valve of the secondary heat exchange branch 200 are controlled to close to block the flow path of the secondary heat exchange branch 200; optionally, in this mode, the first switching module 300 can be in the first switching state or the second switching state.

[0101] (ii) "Dual cooling" mode, such as Figure 7The refrigerant flow direction is indicated by the middle arrow. In this mode, the second heat exchanger 130 of the main heat exchange circuit 100 and the third heat exchanger 210 (air-refrigerant heat exchanger) of the auxiliary heat exchange branch 200 are used simultaneously to cool the indoor environment, or the third heat exchanger 210 (water-refrigerant heat exchanger) of the auxiliary heat exchange branch 200 is used simultaneously to produce chilled water. Here, when the refrigeration system switches to the "dual refrigeration" mode, the four-way valve 140 is controlled to switch to the first valve 323 state so that the main heat exchange circuit 100 operates according to the refrigeration cycle flow direction; and the first switching module 300 is controlled to switch to the second switching state so that the first branch end 221 of the auxiliary heat exchange branch 200 is connected to the return port 112 of the compressor 110, and the auxiliary throttling device 230, liquid storage solenoid valve and other valves of the auxiliary heat exchange branch 200 are controlled to open to open the flow path of the auxiliary heat exchange branch 200. During this process, the refrigerant discharged from the compressor 110 first flows through the outdoor unit heat exchanger, and then is split to the second heat exchanger 130 and the third heat exchanger 210 for heat exchange respectively. Finally, the refrigerant from the two heat exchangers merges again and flows back to the compressor 110.

[0102] (III) "Cooling + Heating" mode, such as Figure 8 The refrigerant flow direction indicated by the middle arrow indicates that this mode utilizes the second heat exchanger 130 of the main heat exchange circuit 100 to cool the indoor environment, while simultaneously using the third heat exchanger 210 (water-refrigerant heat exchanger) of the auxiliary heat exchange branch 200 to produce hot water. Here, when the refrigeration system switches to the "cooling + heating" mode, the four-way valve 140 is controlled to switch to the first valve 323 state so that the main heat exchange circuit 100 operates according to the refrigeration cycle flow direction; and the first switching module 300 is controlled to switch to the first switching state so that the first branch end 221 of the auxiliary heat exchange branch 200 is connected to the exhaust port 111 of the compressor 110, and the auxiliary throttling element 230, liquid storage solenoid valve, and other valves of the auxiliary heat exchange branch 200 are controlled to open to open the flow path of the auxiliary heat exchange branch 200. During this process, part of the refrigerant discharged from the compressor 110 flows to the first heat exchanger 120, and another part of the refrigerant flows to the third heat exchanger 210 of the auxiliary heat exchange branch 200. After that, the two flow back into the second heat exchanger 130 for heat exchange, and finally the refrigerant flows back to the compressor 110.

[0103] (iv) "Single heating" mode, such as Figure 9The refrigerant flow direction is indicated by the middle arrow. In this mode, only the second heat exchanger 130 of the main heat exchange circuit 100 is used to heat the indoor environment. Here, when the refrigeration system switches to the "single heating" mode, the four-way valve 140 is controlled to switch to the second valve 324 state so that the main heat exchange circuit 100 operates according to the heating cycle flow direction; and the secondary throttling element 230 and / or liquid storage solenoid valve of the secondary heat exchange branch 200 are controlled to close to block the flow path of the secondary heat exchange branch 200; optionally, in this mode, the first switching module 300 can be in the first switching state or the second switching state.

[0104] (V) "Dual heating" mode, such as Figure 10 The refrigerant flow direction is indicated by the middle arrow. In this mode, the second heat exchanger 130 of the main heat exchange circuit 100 and the third heat exchanger 210 (air-refrigerant heat exchanger) of the auxiliary heat exchange branch 200 are used simultaneously to heat the indoor environment, or the third heat exchanger 210 (water-refrigerant heat exchanger) of the auxiliary heat exchange branch 200 is used simultaneously to produce hot water. Here, when the refrigeration system switches to the "dual heating" mode, the four-way valve 140 is controlled to switch to the second valve 324 state so that the main heat exchange circuit 100 operates according to the heating cycle flow direction; and the first switching module 300 is controlled to switch to the first switching state so that the first branch end 221 of the auxiliary heat exchange branch 200 is connected to the exhaust port 111 of the compressor 110, and the auxiliary throttling element 230, liquid storage solenoid valve and other valves of the auxiliary heat exchange branch 200 are controlled to open to conduct the flow path of the auxiliary heat exchange branch 200. During this process, part of the refrigerant discharged from the compressor 110 flows to the second heat exchanger 130, and another part of the refrigerant flows to the third heat exchanger 210 of the auxiliary heat exchange branch 200. After that, the two flow back into the first heat exchanger 120 for heat exchange, and finally the refrigerant flows back to the compressor 110.

[0105] (vi) "Defrost" mode, such as Figure 11The refrigerant flow direction indicated by the middle arrow indicates that this mode simultaneously utilizes the refrigerant heat from the main heat exchange circuit 100 to defrost the first heat exchanger 120, and utilizes the solar energy from the third heat exchanger 210 (solar heat exchanger) of the secondary heat exchange branch 200 to maintain heating for the second heat exchanger 130. Here, when the refrigeration system switches to the "defrost" mode, the four-way valve 140 is controlled to switch to the first valve 323 state so that the main heat exchange circuit 100 operates according to the refrigeration cycle flow direction; and the first switching module 300 is controlled to switch to the first switching state so that the first branch end 221 of the secondary heat exchange branch 200 is connected to the exhaust port 111 side of the compressor 110, and the valves such as the secondary throttling element 230 and the liquid storage solenoid valve of the secondary heat exchange branch 200 are opened to open the flow path of the secondary heat exchange branch 200. During this process, a portion of the refrigerant discharged from the compressor 110 flows directly to the first heat exchanger 120. At this time, the heat of the high-temperature refrigerant can be used to melt the frost condensed in the first heat exchanger 120. Another portion of the refrigerant flows to the third heat exchanger 210 of the secondary heat exchange branch 200 and is heated by light energy. Afterward, the two re-merge and flow into the first heat exchanger 120 for heat exchange. Since the refrigerant temperature from the secondary heat exchange branch 200 is higher, the refrigerant flowing into the first heat exchanger 120 can also play a role in heating the indoor environment.

[0106] (vii) "Low load" mode, such as Figure 12 The refrigerant flow direction indicated by the middle arrow is suitable for indoor environments with low heat exchange loads corresponding to the second heat exchanger 130. Taking the refrigeration mode as an example, when the refrigeration system switches to the "low load" mode, the four-way valve 140 is controlled to switch to the first valve 323 state so that the main heat exchange circuit 100 operates according to the refrigeration cycle flow direction; and the first switching module 300 is controlled to switch to the third switching state so that the exhaust port 111 side and the return port 112 side of the compressor 110 are connected with a small flow rate. At this time, part of the refrigerant discharged by the compressor 110 can flow back to the return port 112 of the compressor 110 through the first switching module 300. Optionally, before the refrigeration system executes the "low load" mode, the auxiliary heat exchange branch 200 can be controlled to perform liquid storage operation. The specific liquid storage control method can be referred to the previous embodiment to use the auxiliary heat exchange branch 200 to store the excess refrigerant of the refrigeration system, so that the actual refrigerant circulation volume of the refrigeration system meets the refrigerant circulation requirements of the current low load condition.

[0107] Combination Figure 13 In addition to the embodiments shown, this application also provides another refrigeration system, which solves the problem of... Figure 2Based on the illustrated model, a main control valve 160 is added. The main control valve 160 is installed on the main heat exchange branch 100 and located on the refrigerant pipeline between the first heat exchanger 120 and the second branch end 222 of the auxiliary heat exchange branch 200. Here, by coordinating the control of the main control valve 160 with the first switching module 300, the main throttling device 150, and the auxiliary throttling device 230, switching control of different operating states under various working conditions can be achieved.

[0108] Table 1 shows the operating states that the refrigeration system can achieve and the control methods for each valve component when the "air-refrigerant heat exchanger" is used as the third heat exchanger 210, as shown in the table below:

[0109] Table 1

[0110]

[0111]

[0112] Table 2 shows the operating states that the refrigeration system can achieve and the control methods for each valve component when a "water-cooled medium heat exchanger" is used as the third heat exchanger 210, as shown in the table below:

[0113] Table 2

[0114]

[0115] Compared to the refrigeration system shown in the previous embodiment, this embodiment can achieve coordinated control of multiple states of the two indoor units (second heat exchanger 130 and third heat exchanger 210) by switching the states of valves such as the main control valve 160 and the first switching module 300. In particular, the second heat exchanger 130 and the third heat exchanger 210 can be used to form a refrigerant circulation working state independently, such as the "second heat exchanger heating, third heat exchanger cooling" operation mode shown in Table 1. In this mode, the second heat exchanger 130 acts as a "condenser" and the third heat exchanger 210 acts as an "evaporator". The first heat exchanger 120 does not need to participate in the refrigerant circulation. Therefore, it can be applied to special working conditions such as outdoor unit heat exchanger failure maintenance and outdoor unit frosting. It can maintain the normal operation of the refrigeration system without activating the outdoor unit heat exchanger.

[0116] In some optional embodiments, this application also discloses a control method for a refrigeration system, which is applicable to the refrigeration system configurations shown in the foregoing embodiments. Specifically, as Figure 14 As shown, the main steps of this control method include:

[0117] S10. Obtain the target operating mode of the refrigeration system;

[0118] Optionally, the target operating mode can be a mode type selected by the user. For example, taking an air conditioner as an example, the user can trigger the generation of a mode operating command through the "Mode" function button on the air conditioner's remote control or touchscreen, or through the "Mode" function option in a mobile application (such as a mobile phone or tablet) associated with the air conditioner. In this way, the air conditioner can use the mode type corresponding to the mode operating command as the target operating mode of the refrigeration system.

[0119] Alternatively, the target operating mode can be the default operating mode of the refrigeration system during this startup. For example, the air conditioner may use the operating mode corresponding to the previous shutdown as the default operating mode for the next startup.

[0120] S20. Control the switching status of the first switching module according to the target operating mode.

[0121] Here, the specific configuration of the first switching module and its piping arrangement with the refrigeration system can be referred to the previous embodiment, and will not be repeated here.

[0122] Specifically, when the target operating mode is "cooling + heating", the first switching module is in the first switching state. In the first switching state, its first interface is connected to the second interface, and the third interface is blocked. In this mode, the refrigerant can flow through the main heat exchange circuit and the auxiliary heat exchange branch respectively, and can simultaneously realize the functions of indoor cooling and hot water production.

[0123] When the target operating mode is "dual heating," the first switching module is in the first switching state, in which its first interface is connected to the second interface and the third interface is blocked. In this mode, the refrigerant can flow through the main heat exchange circuit and the auxiliary heat exchange branch respectively, and can simultaneously realize the functions of indoor heating and hot water preparation.

[0124] When the target operating mode is "defrost," the first switching module is in the first switching state, in which its first interface is connected to the second interface and the third interface is blocked. In this mode, the refrigerant can flow through the main heat exchange circuit and the auxiliary heat exchange branch respectively, and can simultaneously realize the functions of defrosting the outdoor unit and maintaining indoor heating.

[0125] When the target operating mode is "dual cooling," the first switching module is in the second switching state. In the second switching state, the first and third interfaces are connected, while the second interface is blocked. In this mode, the refrigerant can flow through the main heat exchange circuit and the auxiliary heat exchange branch respectively, and the function of cooling both sides of the room can be realized simultaneously.

[0126] When the target operating mode is "low load," the first switching module is in the third switching state. In the third switching state, the second and third interfaces are connected, and the first interface is blocked. In this mode, the refrigerant flows only through the main heat exchange circuit, enabling indoor cooling / heating functions under low load conditions.

[0127] Here, the coordination of other valves or flow path components under the above target operating modes can be referred to the previous embodiments, and will not be repeated here.

[0128] In some alternative embodiments, this application also provides a refrigeration device, which may include, but is not limited to, air conditioners, refrigerators, freezers, etc.

[0129] Specifically, the refrigeration equipment includes the main body of the equipment and the refrigeration system shown in the previous embodiment. The refrigeration system can have multiple functions such as single refrigeration, single heating, dual refrigeration, dual heating, refrigeration + heating, and outdoor unit defrosting, which can meet the usage needs of the refrigeration system under different working conditions and also expand the overall function of the refrigeration system.

[0130] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A refrigeration system, characterized in that, include: The main heat exchange circuit includes a compressor, a first heat exchanger, and a second heat exchanger connected in sequence. The secondary heat exchange branch includes a third heat exchanger; the first branch end of the secondary heat exchange branch is connected to the compressor's exhaust port through a first switching module, and the second branch end is connected to the refrigerant pipeline between the first heat exchanger and the second heat exchanger. The first switching module has a first interface connecting to the first branch end of the auxiliary heat exchange branch, a second interface connecting to the exhaust port of the compressor, and a third interface connecting to the return port of the compressor; wherein the first switching module includes at least two switching states that connect two interfaces and block the other interface.

2. The refrigeration system according to claim 1, characterized in that, The first switching module includes a first three-way valve, which has a first valve port as a first interface, a second valve port as a second interface, and a third valve port as a third interface; or, The first switching module includes a first sub-branch and a second sub-branch. The first sub-branch is connected between the first branch end and the compressor's exhaust port, and the second sub-branch is connected between the first branch end and the compressor's return port. The first switching module also includes a first valve disposed in the first sub-branch and a second valve disposed in the second sub-branch. Alternatively, The first switching module includes a first sub-branch and a second sub-branch. The first sub-branch is connected between the first branch end and the compressor's exhaust port, and the second sub-branch is connected between the first branch end and the compressor's return port. The first switching module also includes a first valve disposed on the first sub-branch, a second valve disposed on the second sub-branch, and a third valve disposed on the first branch end.

3. The refrigeration system according to claim 1 or 2, characterized in that, The first switching module includes at least the following two switching states: In the first switching state, the first interface of the first switching module is connected to the second interface, and the third interface is blocked. In the second switching state, the first interface of the first switching module is connected to the third interface, and the second interface is blocked. In the third switching state, the second and third interfaces of the first switching module are connected, while the first interface is blocked.

4. The refrigeration system according to claim 1, characterized in that, The main heat exchange branch also includes a main throttling element, which is installed on the refrigerant pipeline between the second heat exchanger and the first heat exchanger; The second branch of the secondary heat exchange branch is connected between the first heat exchanger and the main throttling element.

5. The refrigeration system according to claim 4, characterized in that, The secondary heat exchange branch also includes a secondary throttling element, which is installed on the refrigerant pipeline between the third heat exchanger and the second branch end.

6. The refrigeration system according to claim 1, characterized in that, The main heat exchange branch also includes a main throttling element, which is installed on the refrigerant pipeline between the second heat exchanger and the first heat exchanger; The secondary heat exchange branch also includes a second switching module, which has a fourth interface connecting the second branch end of the secondary heat exchange branch, a fifth interface connecting the first heat exchanger and the main throttling element, and a sixth interface connecting the second heat exchanger and the main throttling element. The second switching module includes at least a first bypass state and a second bypass state. In the first bypass state, the fourth interface and the fifth interface are connected and the sixth interface is blocked. In the second bypass state, the fourth interface and the sixth interface are connected and the fifth interface is blocked.

7. The refrigeration system according to claim 6, characterized in that, The second switching module includes a second three-way valve, which has a fourth valve port as a fourth interface, a fifth valve port as a fifth interface, and a sixth valve port as a sixth interface. or, The second switching module includes a third sub-branch and a fourth sub-branch. One end of the third sub-branch is connected to the end of the second branch, and the other end is connected between the first heat exchanger and the main throttling element. One end of the fourth sub-branch is connected to the end of the second branch, and the other end is connected between the second heat exchanger and the main throttling element. The second switching module also includes a fourth valve disposed on the third sub-branch and a fifth valve disposed on the fourth sub-branch.

8. The refrigeration system according to claim 1, characterized in that, The third heat exchanger is of at least one of the following types: water-cooled refrigerant heat exchanger, air-cooled refrigerant heat exchanger, or solar collector.

9. The refrigeration system according to claim 1, characterized in that, The secondary heat exchange branch also includes a liquid storage control valve, which is located on the refrigerant pipeline between the third heat exchanger and the first branch end.

10. The refrigeration system according to claim 1, characterized in that, The main heat exchange branch also includes a main control valve, which is located on the refrigerant pipeline between the first heat exchanger and the second branch end.

11. A refrigeration device, characterized in that, include: Equipment body; and The refrigeration system as described in any one of claims 1 to 10.

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