Heat exchange structure and air conditioning system with same

Abstract

The utility model provides a heat exchange structure and an air conditioning system with the heat exchange structure, the heat exchange structure comprises a main heat exchange pipeline, the main heat exchange pipeline is provided with a first communication part and a second communication part, and the first communication part is used for being connected with a four-way valve; the auxiliary heat exchange pipeline is provided with a third communicating part and a fourth communicating part, the second communicating part communicates with the third communicating part, and the fourth communicating part is used for being connected with a throttling device; wherein the heat exchange structure has a refrigeration working state and a heating working state; when the heat exchange structure is in a refrigeration working state, the first communicating part is an inflow part, the third communicating part is an inlet part, and the at least two auxiliary branches are arranged in series; and when the heat exchange structure is in a heating working state, the second communicating part is an inflow part, the fourth communicating part is an inlet part, and the at least two auxiliary branches are arranged in parallel. According to the technical scheme provided by the utility model, the technical problem that a heat exchange structure in the prior art cannot have better refrigerating and heating effects at the same time can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange structures, in particular to a heat exchange structure and an air-conditioning system having the same. Background Art

[0002] At present, heat exchange structures in the prior art are widely used in the field of air conditioning. A refrigerant flows through the heat exchange structure, and the heat exchange structure is used to exchange heat with the air to achieve evaporation or condensation functions.

[0003] However, the heat exchange structure in the prior art is mostly a single heat exchange process structure, and the heat exchange process of the heat exchange structure when performing cooling or heating is constant, which cannot effectively take into account the requirements of different heat exchange processes during cooling or heating. As a result, the existing heat exchange structure cannot simultaneously meet the better cooling or heating effects. Utility Model Content

[0004] The main purpose of the utility model is to provide a heat exchange structure and an air-conditioning system having the same, so as to solve the technical problem that the heat exchange structure in the prior art cannot have good cooling and heating effects at the same time.

[0005] In order to achieve the above object, according to one aspect of the present invention, a heat exchange structure is provided, comprising:

[0006] A main heat exchange pipeline, the main heat exchange pipeline having a first communicating portion and a second communicating portion, one of the first communicating portion and the second communicating portion being an inflow portion and the other being an outflow portion, the first communicating portion being used to connect to the four-way valve;

[0007] an auxiliary heat exchange pipeline, the auxiliary heat exchange pipeline having a third communicating portion and a fourth communicating portion, one of the third communicating portion and the fourth communicating portion being an inlet portion and the other being an outlet portion, the second communicating portion being in communication with the third communicating portion, and the fourth communicating portion being used to connect to the throttling device;

[0008] Among them, the auxiliary heat exchange pipeline has at least two auxiliary branches, and the heat exchange structure has a cooling working state and a heating working state; when the heat exchange structure is in the cooling working state, the first connecting part is the inlet part, the third connecting part is the inlet part, and at least two auxiliary branches are arranged in series; when the heat exchange structure is in the heating working state, the second connecting part is the inlet part, the fourth connecting part is the inlet part, and at least two auxiliary branches are arranged in parallel.

[0009] Furthermore, the connection between two adjacent auxiliary branches of at least two auxiliary branches is a U-shaped connection structure; and / or,

[0010] The auxiliary branch is a U-shaped branch.

[0011] Furthermore, the at least two auxiliary branches include a first auxiliary branch, a second auxiliary branch, and a third auxiliary branch, two ends of the second auxiliary branch are respectively connected to one end of the first auxiliary branch and one end of the third auxiliary branch, and the heat exchange structure further includes:

[0012] a first three-way valve, wherein the three communication ports of the first three-way valve respectively form a third communication portion connected to the other end of the third auxiliary branch and to the connection point between the first auxiliary branch and the second auxiliary branch;

[0013] a second three-way valve, wherein the three communication ports of the second three-way valve respectively form a fourth communication portion, connected to the connection point of the second auxiliary branch and the third auxiliary branch, and connected to the other end of the first auxiliary branch;

[0014] a first one-way valve, provided on the connecting pipeline between the connection point of the first auxiliary branch and the second auxiliary branch and the first three-way valve, so that the fluid in the connecting pipeline flows to the first three-way valve through the first one-way valve;

[0015] The second one-way valve is arranged on the connecting pipeline between the connection point of the second auxiliary branch and the third auxiliary branch and the second three-way valve, so that the fluid in the connecting pipeline flows through the second one-way valve to the connection point of the second auxiliary branch and the third auxiliary branch.

[0016] Furthermore, the connection between the first auxiliary branch and the second auxiliary branch is a U-shaped connection structure; and / or,

[0017] The connection point between the second auxiliary branch and the third auxiliary branch is a U-shaped connection structure.

[0018] Furthermore, the first auxiliary branch is a U-shaped flow path; and / or,

[0019] The second auxiliary branch is a U-shaped flow path; and / or,

[0020] The third auxiliary branch is a U-shaped flow path.

[0021] Furthermore, the first auxiliary branch, the second auxiliary branch and the third auxiliary branch are connected in sequence along the height direction of the heat exchange structure; and / or,

[0022] The first auxiliary branch is located above the second auxiliary branch.

[0023] Furthermore, the main heat exchange pipeline is a U-shaped bent pipe.

[0024] Furthermore, the main heat exchange pipeline includes a plurality of main heat exchange branches, one end of each of the plurality of main heat exchange branches is connected to the first connecting portion, and the other end of each of the plurality of main heat exchange branches is connected to the second connecting portion.

[0025] Furthermore, the heat exchange structure further includes a first liquid separator, which is arranged between one end of the plurality of main heat exchange branches and the first connecting portion; and / or,

[0026] The heat exchange structure further includes a second liquid separator, which is arranged between the other end of the plurality of main heat exchange branches and the second connecting portion; and / or,

[0027] A plurality of main heat exchange branches are arranged at intervals along the height direction of the heat exchange structure.

[0028] According to another aspect of the present invention, an air-conditioning system is provided, comprising the heat exchange structure provided above.

[0029] By applying the technical solution of the present invention, when the heat exchange structure is in a cooling working state, the first connecting part is the inlet part, the third connecting part is the inlet part, and at least two auxiliary branches are arranged in series. In this way, it is easy to increase the heat exchange and cooling process, provide the maximum local resistance coefficient, increase the pressure loss of the refrigerant, and release heat by reducing pressure, so that the refrigerant is fully converted to a low-temperature and low-pressure pressure, thereby improving the heat exchange efficiency and the cooling effect, and finally flows to the throttling device for throttling. When the heat exchange structure is in a heating working state, the second connecting part is the inlet part, the fourth connecting part is the inlet part, and at least two auxiliary branches are arranged in parallel. In this way, it is possible to provide the minimum local resistance coefficient, reduce the pressure loss of the refrigerant, prevent excessive pressure loss, and prevent frost from forming due to too low an evaporation temperature, thereby avoiding affecting the heating amount and frequently entering defrost, thereby improving the heating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0031] Figure 1 A schematic structural diagram of a heat exchange structure provided according to an embodiment of the present utility model is shown.

[0032] The above drawings include the following reference numerals:

[0033] 10. Main heat exchange pipeline; 11. First connecting portion; 12. Second connecting portion; 13. Main heat exchange branch;

[0034] 20. Auxiliary heat exchange pipeline; 21. Third connecting portion; 22. Fourth connecting portion; 23. First auxiliary branch; 24. Second auxiliary branch; 25. Third auxiliary branch; 26. U-shaped connection structure;

[0035] 31. First three-way valve; 32. Second three-way valve;

[0036] 41. First one-way valve; 42. Second one-way valve;

[0037] 51. First liquid dispenser; 52. Second liquid dispenser. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] like Figure 1 As shown, embodiment 1 of the present invention provides a heat exchange structure, which includes a main heat exchange pipeline 10 and an auxiliary heat exchange pipeline 20. The main heat exchange pipeline 10 has a first connecting portion 11 and a second connecting portion 12, one of the first connecting portion 11 and the second connecting portion 12 is an inlet portion and the other is an outflow portion, and the first connecting portion 11 is used to connect to the four-way valve; the auxiliary heat exchange pipeline 20 has a third connecting portion 21 and a fourth connecting portion 22, one of the third connecting portion 21 and the fourth connecting portion 22 is an inlet portion and the other is an outlet portion, the second connecting portion 12 is connected to the third connecting portion 21, and the fourth connecting portion 22 is used to connect to the throttling device. Among them, the auxiliary heat exchange pipeline 20 has at least two auxiliary branches, and the heat exchange structure has a cooling working state and a heating working state; when the heat exchange structure is in the cooling working state, the first connecting part 11 is the inlet part, the third connecting part 21 is the inlet part, and at least two auxiliary branches are arranged in series; when the heat exchange structure is in the heating working state, the second connecting part 12 is the inlet part, the fourth connecting part 22 is the inlet part, and at least two auxiliary branches are arranged in parallel.

[0040] With the heat exchange structure provided in this embodiment, when the heat exchange structure is in a cooling state, the first connecting portion 11 serves as the inlet, the third connecting portion 21 serves as the inlet, and at least two auxiliary branches are arranged in series. This facilitates increasing the heat exchange and cooling process, provides a maximum local resistance coefficient, increases the pressure loss of the refrigerant, and releases heat by reducing pressure, allowing the refrigerant to fully reach a low temperature and low pressure, improving heat exchange efficiency and enhancing the cooling effect, and finally flowing to the throttling device for throttling. When the heat exchange structure is in a heating state, the second connecting portion 12 serves as the inlet, the fourth connecting portion 22 serves as the inlet, and at least two auxiliary branches are arranged in parallel. This minimizes the local resistance coefficient, reduces the pressure loss of the refrigerant, prevents excessive pressure loss and frosting due to low evaporation temperatures, thereby avoiding affecting the heating capacity and frequent defrosting, and improving the heating effect. Therefore, the heat exchange structure in this embodiment has different flow paths in different operating states. Therefore, the heat exchange structure provided in this embodiment can solve the technical problem that heat exchange structures in the prior art cannot achieve both good cooling and heating effects.

[0041] In this embodiment, the connection point between two adjacent auxiliary branches of at least two auxiliary branches is a U-shaped connection structure 26. With such a structural setting, the flow rate and pressure loss of the refrigerant can be reduced by adopting the U-shaped connection structure 26. Specifically, when the refrigeration is used as a condenser, since the necessity of considering pressure loss is low, the flow path can be flexibly processed by the U-shaped connection structure 26, which increases the pressure loss, improves the heat transfer rate, and improves the energy efficiency of the whole machine. The U-shaped connection structure 26 can flexibly process the flow path of the heat exchange structure, and based on the different optimal pressure drops required for cooling and heating, the energy efficiency of the heat exchange structure and the air-conditioning system can be effectively improved.

[0042] Specifically, the auxiliary branch is a U-shaped branch, which can facilitate better flexible processing of the flow path in each auxiliary branch, thereby improving the energy efficiency of the heat exchange structure and the air conditioning system.

[0043] In this embodiment, the at least two auxiliary branches include a first auxiliary branch 23, a second auxiliary branch 24, and a third auxiliary branch 25. The two ends of the second auxiliary branch 24 are connected to one end of the first auxiliary branch 23 and one end of the third auxiliary branch 25, respectively. The heat exchange structure further includes a first three-way valve 31, a second three-way valve 32, a first check valve 41, and a second check valve 42. The three communication ports of the first three-way valve 31 respectively form a third communication portion 21, which is connected to the other end of the third auxiliary branch 25 and the junction of the first auxiliary branch 23 and the second auxiliary branch 24. The three communication ports of the second three-way valve 32 respectively form a fourth communication portion 22, which is connected to the junction of the second auxiliary branch 24 and the third auxiliary branch 25, and the other end of the first auxiliary branch 23. The first check valve 41 is disposed in the connecting pipeline between the junction of the first and second auxiliary branches 23, 24 and the first three-way valve 31, so that fluid in the connecting pipeline flows through the first check valve 41 to the first three-way valve 31. A second one-way valve 42 is disposed in the connecting pipeline between the junction of the second auxiliary branch 24 and the third auxiliary branch 25 and the second three-way valve 32, allowing the fluid in the connecting pipeline to flow through the second one-way valve 42 to the junction of the second auxiliary branch 24 and the third auxiliary branch 25. With this structural arrangement, when the heat exchange structure is in a cooling state, the first auxiliary branch 23, the second auxiliary branch 24, and the third auxiliary branch 25 are connected in series to further improve the cooling effect; when the heat exchange structure is in a heating state, the first auxiliary branch 23, the second auxiliary branch 24, and the third auxiliary branch 25 are connected in parallel to further improve the heating effect.

[0044] Specifically, the connection between the first auxiliary branch 23 and the second auxiliary branch 24 is a U-shaped connection structure 26, so as to better flexibly handle the refrigerant at the connection between the first auxiliary branch 23 and the second auxiliary branch 24, change the resistance of the refrigerant at the connection between the first auxiliary branch 23 and the second auxiliary branch 24, and better achieve cooling or heating working conditions.

[0045] Specifically, the connection between the second auxiliary branch 24 and the third auxiliary branch 25 is a U-shaped connection structure 26. This structural arrangement facilitates flexible processing of the refrigerant at the connection between the second auxiliary branch 24 and the third auxiliary branch 25, changes the resistance of the refrigerant at the connection between the first auxiliary branch 23 and the second auxiliary branch 24, and thus better achieves cooling or heating conditions.

[0046] In this embodiment, the first auxiliary branch 23 is a U-shaped flow path, which can facilitate better flexible processing of the refrigerant in the first auxiliary branch 23 and change the resistance of the refrigerant in the first auxiliary branch 23.

[0047] Specifically, the second auxiliary branch 24 is a U-shaped flow path, which can facilitate better flexible processing of the refrigerant in the second auxiliary branch 24 and change the resistance of the refrigerant in the second auxiliary branch 24.

[0048] Specifically, the third auxiliary branch 25 is a U-shaped flow path, which can facilitate better flexible processing of the refrigerant in the third auxiliary branch 25 and change the resistance of the refrigerant in the third auxiliary branch 25.

[0049] In this embodiment, the first auxiliary branch 23, the second auxiliary branch 24, and the third auxiliary branch 25 are sequentially connected along the height direction of the heat exchange structure. This structural arrangement optimizes the structural and spatial layout of the first auxiliary branch 23, the second auxiliary branch 24, and the third auxiliary branch 25, resulting in a simple structure and space saving.

[0050] Specifically, the first auxiliary branch 23 is located above the second auxiliary branch 24 to optimize the structural layout and make the layout of the heat exchange structure simpler.

[0051] In this embodiment, the main heat exchange pipeline 10 is a U-shaped bent tube, so as to better flexibly process the refrigerant in the main heat exchange pipeline 10 and reduce the circulation resistance of the refrigerant.

[0052] Specifically, the main heat exchange pipeline 10 includes multiple main heat exchange branches 13, one end of each of the multiple main heat exchange branches 13 is connected to the first connecting portion 11, and the other end of each of the multiple main heat exchange branches 13 is connected to the second connecting portion 12. In this way, it is convenient to flexibly implement the heat exchange process of the multiple main heat exchange branches 13 separately, avoid the situation where heat exchange is performed only through a longer heat exchange branch, reduce flow losses in the normal flow path, and facilitate better improvement of the heat exchange effect.

[0053] In this embodiment, the heat exchange structure also includes a first liquid separator 51, which is arranged between one end of the multiple main heat exchange branches 13 and the first connecting part 11, so as to facilitate liquid separation or liquid collection through the first liquid separator 51, so as to smoothly divide the liquid into multiple main heat exchange branches 13 or collect liquid in multiple main heat exchange branches 13.

[0054] Specifically, the heat exchange structure also includes a second liquid separator 52, which is arranged between the other end of the multiple main heat exchange branches 13 and the second connecting part 12, so as to facilitate liquid separation or liquid collection through the second liquid separator 52, so as to smoothly divide the liquid into multiple main heat exchange branches 13 or collect liquid in multiple main heat exchange branches 13.

[0055] In this embodiment, the plurality of main heat exchange branches 13 are spaced apart along the height direction of the heat exchange structure. This facilitates the optimization of the structural layout of the plurality of main heat exchange branches 13, making the structural layout of the plurality of main heat exchange branches 13 simple, easy to arrange and install, and saving space.

[0056] Specifically, the number of main heat exchange branches 13 in this embodiment may also be three.

[0057] Specifically, the heat exchange structure in this embodiment includes 12 long U-tubes, 2 diverters (the diverter is a 1-to-3 structure, and the 2 diverters correspond to the first diverter and the second diverter respectively), 2 one-way valves, 6 elbows, 2 U-bend tees (corresponding to the U-shaped connection structure 26), two three-way valves (the three-way valve can be a T-shaped structure, and the two three-way valves correspond to the first three-way valve 31 and the second three-way valve 32) and several connecting pipelines.

[0058] The cooling working state of the heat exchange structure in this embodiment is:

[0059] The first diverter is the high-pressure side, and the second three-way valve 32 is the low-pressure side. Therefore, the refrigerant flows from the first diverter to the second three-way valve 32, and then to the throttling device for throttling. During refrigeration, the high-temperature and high-pressure refrigerant vapor passes through the first diverter and is divided into three paths to condense and release heat, and then converges at the second diverter. At this time, each of the three paths is three long U-tubes. After passing through the second diverter, it comes to the first three-way valve 31. Since the first three-way valve 31 is below the cut-off direction of the first one-way valve 41, it cannot pass through. The refrigerant flows into the first auxiliary branch 23, and after passing through the first auxiliary branch 23, it flows into the connection between the first auxiliary branch 23 and the second auxiliary branch 24. The connection between the first auxiliary branch 23 and the second auxiliary branch 24 is correspondingly connected to the second one-way valve 42, and the corresponding flow direction is the cut-off direction of the second one-way valve 42, so the refrigerant can only flow into the second auxiliary branch 24. After passing through the second auxiliary branch 24, the refrigerant flows through the connection between the second auxiliary branch 24 and the third auxiliary branch 25. At this time, the connection between the second auxiliary branch 24 and the third auxiliary branch 25 has two directions, one of which is the flow direction leading to the first one-way valve 41. Since the pressure at the connection between the second auxiliary branch 24 and the third auxiliary branch 25 is lower than the pressure of the first three-way valve 31, the refrigerant will not flow back and can only flow to the third auxiliary branch 25. After passing through the third auxiliary branch 25, it enters the second three-way valve 32. Similarly, since the pressure before the second one-way valve 42 here is lower than the pressure at the connection between the first auxiliary branch 23 and the second auxiliary branch 24, the second one-way valve 42 cannot be connected, and the refrigerant can only flow to the throttling device to complete the refrigeration cycle. Here, the first auxiliary branch 23, the second auxiliary branch 24 and the third auxiliary branch 25 are connected in series, providing the maximum local resistance coefficient, increasing the pressure loss of the refrigerant, and releasing heat by reducing the pressure, so that the refrigerant is fully converted to low-temperature and low-pressure pressure, thereby improving the heat exchange efficiency. Finally, throttling is carried out at the throttling device.

[0060] The heating working state of the heat exchange structure in this embodiment is:

[0061] During heating, due to the direction switching of the four-way valve, the pressure of the second three-way valve 32 is higher than the pressure of the first diverter, so the refrigerant flows through the second three-way valve 32 and then flows to the third auxiliary branch 25 and the second one-way valve 42 respectively. The refrigerant flowing to the second one-way valve 42 passes through the second one-way valve 42 and then passes through the connection between the first auxiliary branch 23 and the second auxiliary branch 24 to be diverted to the second auxiliary branch 24 and the first auxiliary branch 23. Among them, the refrigerant in the first auxiliary branch 23 directly comes to the first three-way valve 31, while the refrigerant in the second auxiliary branch 24 and the third auxiliary branch 25 converges at the connection between the second auxiliary branch 24 and the second auxiliary branch 24, and then passes through the first one-way valve 41. After passing through the first one-way valve 41, it comes to the first three-way valve 31 and merges with the refrigerant in the first auxiliary branch 23, and goes to the second diverter together for diversion. At this time, the first auxiliary branch 23, the second auxiliary branch 24 and the third auxiliary branch 25 are in parallel under the action of the first one-way valve 41 and the second one-way valve 42, and the number of diversion paths is consistent with the overall heat exchange number, and is also divided into three paths. Here, the first auxiliary branch 23, the second auxiliary branch 24 and the third auxiliary branch 25 are in parallel, providing a minimum local resistance coefficient, reducing the pressure loss of the refrigerant, preventing excessive pressure loss, too low evaporation temperature, frosting, affecting heating capacity and frequent defrosting. When the refrigerant passes through the first auxiliary branch 23, the second auxiliary branch 24 and the third auxiliary branch 25, part of the refrigerant has evaporated into a gaseous state, and is divided into three paths through the second diverter to fully evaporate into a gaseous state, and then converge at the first diverter and return to the compressor through the four-way valve.

[0062] The efficiency improvement principle in this embodiment is described as follows:

[0063] In cooling mode, the advantage of using three long U-tubes in series (first auxiliary branch 23, second auxiliary branch 24, and third auxiliary branch 25) is increased liquid subcooling. When the refrigerant is throttled, the pressure drop causes some of the refrigerant to evaporate and gasify. This reduces the amount of refrigerant entering the evaporator for evaporation, reducing energy efficiency. Lowering the refrigerant temperature before throttling reduces the amount of liquid refrigerant that evaporates during throttling, resulting in higher evaporation efficiency. In practice, within a certain range, the longer the subcooling process, the better the subcooling effect.

[0064] In heating mode, the advantage of using three parallel U-tubes (first auxiliary branch 23, second auxiliary branch 24, and third auxiliary branch 25) is that it reduces pressure loss compared to a series connection. During heating, the outer heat exchanger functions as an evaporator, and the refrigerant inlet and outlet are opposite to those during cooling. Furthermore, the refrigerant has just been throttled before entering, resulting in a higher flow rate. This increase in the local resistance coefficient can easily cause pressure loss. The refrigerant flowing through this section is in liquid form, so this section of the flow path has a smaller impact on the cooling pressure loss. This is the theoretical basis for the previously mentioned reasoning that it is unnecessary to consider pressure loss when the refrigerant is used as a condenser. The figure below further illustrates the impact of pressure loss on evaporation. This discussion focuses solely on the impact of pressure drop in the evaporator on overall performance and heating capacity. To ensure near-complete evaporation at the evaporator outlet, the refrigerant pressure or temperature must be increased to overcome resistance losses in the system. This provides an average temperature during evaporation, but this reduces the heat exchange temperature difference and reduces energy efficiency. Conversely, if the refrigerant's pressure or temperature when entering the evaporator is not increased, the evaporation process will be characterized by lower pressure and temperature. This lower pressure results in increased suction volume, increased compression, and reduced energy efficiency. Lower evaporation temperature also increases the likelihood of frost formation on the heat exchanger, which further impairs heat transfer, lowering pressure and temperature and creating a vicious cycle. Therefore, connecting three long U-tubes in parallel can reduce the local resistance coefficient several times compared to connecting three long U-tubes in series, thus improving the aforementioned theoretical pressure drop problem.

[0065] Taking air conditioners as an example, actual data comparisons show that both three-U series and three-U parallel cooling systems have their own advantages. Using flexible heat exchange, the annual energy efficiency is 5.40, and low-temperature heating is 4496W, with good performance and efficiency. When using series cooling, the annual energy efficiency is 5.44, and low-temperature heating is 4170W. Heating pressure drop is high, capacity is low, and subcooling is good, with high efficiency. When using parallel heating, the annual energy efficiency is 5.34, and low-temperature heating is 4553W. Heating pressure drop is low, capacity is high, and subcooling is poor, with low efficiency.

[0066] A second embodiment of the present invention provides an air-conditioning system, including the heat exchange structure provided in the above embodiment.

[0067] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: through flexible processing of local processes, based on the principle that the optimal processes required for heating and cooling are different, the capacity and energy efficiency of the heat exchanger and the entire machine can be improved. The structure is simple and space-saving.

[0068] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0069] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. Technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0070] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0071] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0072] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A heat exchange structure, characterized in that: include: A main heat exchange pipeline (10), the main heat exchange pipeline (10) having a first communicating portion (11) and a second communicating portion (12), one of the first communicating portion (11) and the second communicating portion (12) being an inflow portion and the other being an outflow portion, the first communicating portion (11) being used for connecting to a four-way valve; an auxiliary heat exchange pipeline (20), the auxiliary heat exchange pipeline (20) having a third communicating portion (21) and a fourth communicating portion (22), one of the third communicating portion (21) and the fourth communicating portion (22) being an inlet portion and the other being an outlet portion, the second communicating portion (12) being in communication with the third communicating portion (21), and the fourth communicating portion (22) being used for connecting to a throttling device; The auxiliary heat exchange pipeline (20) has at least two auxiliary branches, and the heat exchange structure has a cooling working state and a heating working state; when the heat exchange structure is in the cooling working state, the first connecting portion (11) is the inlet portion, the third connecting portion (21) is the inlet portion, and the at least two auxiliary branches are arranged in series; when the heat exchange structure is in the heating working state, the second connecting portion (12) is the inlet portion, the fourth connecting portion (22) is the inlet portion, and the at least two auxiliary branches are arranged in parallel.

2. The heat exchange structure according to claim 1, characterized in that: The connection between two adjacent auxiliary branches of the at least two auxiliary branches is a U-shaped connection structure (26); and / or, The auxiliary branch is a U-shaped branch.

3. The heat exchange structure according to claim 1, characterized in that: The at least two auxiliary branches include a first auxiliary branch (23), a second auxiliary branch (24), and a third auxiliary branch (25), wherein two ends of the second auxiliary branch (24) are respectively connected to one end of the first auxiliary branch (23) and one end of the third auxiliary branch (25), and the heat exchange structure further includes: a first three-way valve (31), wherein the three communication ports of the first three-way valve (31) respectively form the third communication portion (21), are connected to the other end of the third auxiliary branch (25), and are connected to the connection point between the first auxiliary branch (23) and the second auxiliary branch (24); a second three-way valve (32), wherein the three communication ports of the second three-way valve (32) respectively form the fourth communication portion (22), are connected to the connection point of the second auxiliary branch (24) and the third auxiliary branch (25), and are connected to the other end of the first auxiliary branch (23); a first one-way valve (41) provided on a connecting pipeline between a connection point between the first auxiliary branch (23) and the second auxiliary branch (24) and the first three-way valve (31), so that fluid on the connecting pipeline flows to the first three-way valve (31) through the first one-way valve (41); A second one-way valve (42) is provided on the communication pipeline between the connection point between the second auxiliary branch (24) and the third auxiliary branch (25) and the second three-way valve (32), so that the fluid in the communication pipeline flows through the second one-way valve (42) to the connection point between the second auxiliary branch (24) and the third auxiliary branch (25).

4. The heat exchange structure according to claim 3, characterized in that: The connection point between the first auxiliary branch (23) and the second auxiliary branch (24) is a U-shaped connection structure (26); and / or, The connection point between the second auxiliary branch (24) and the third auxiliary branch (25) is a U-shaped connection structure (26).

5. The heat exchange structure according to claim 3, characterized in that: The first auxiliary branch (23) is a U-shaped flow path; and / or, The second auxiliary branch (24) is a U-shaped flow path; and / or, The third auxiliary branch (25) is a U-shaped flow path.

6. The heat exchange structure according to claim 3, characterized in that: The first auxiliary branch (23), the second auxiliary branch (24) and the third auxiliary branch (25) are connected in sequence along the height direction of the heat exchange structure; and / or, The first auxiliary branch (23) is located above the second auxiliary branch (24).

7. The heat exchange structure according to claim 1, characterized in that: The main heat exchange pipeline (10) is a U-shaped bent pipe.

8. The heat exchange structure according to claim 1, characterized in that: The main heat exchange pipeline (10) comprises a plurality of main heat exchange branches (13), one end of each of the plurality of main heat exchange branches (13) is connected to the first connecting portion (11), and the other end of each of the plurality of main heat exchange branches (13) is connected to the second connecting portion (12).

9. The heat exchange structure according to claim 8, characterized in that: The heat exchange structure further comprises a first liquid separator (51), the first liquid separator (51) being arranged between one end of the plurality of main heat exchange branches (13) and the first connecting portion (11); and / or, The heat exchange structure further includes a second liquid separator (52), the second liquid separator (52) being arranged between the other end of the plurality of main heat exchange branches (13) and the second connecting portion (12); and / or, The plurality of main heat exchange branches (13) are arranged at intervals along the height direction of the heat exchange structure.

10. An air conditioning system, characterized in that: The heat exchange structure comprises the heat exchange structure according to any one of claims 1 to 9.

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