Integrated heat exchanger and air conditioning system

Abstract

The utility model relates to the field of heat exchangers, in particular to an integrated heat exchanger and an air conditioning system. The integrated heat exchanger comprises a first heat exchanger, a second heat exchanger, a first connecting assembly and a second connecting assembly, the first heat exchanger is used for introducing a refrigerant and air for heat exchange, and the second heat exchanger is used for introducing flue gas and air for heat exchange; the first connecting assembly is connected with the top of the first heat exchanger and the top of the second heat exchanger, and the second connecting assembly is connected with the end of the first heat exchanger and the end of the second heat exchanger. The integrated heat exchanger is convenient to install and fix, the occupied installation space can be reduced, and the heating requirement in extremely cold weather is met.

Description

Technical Field

[0001] The present application relates to the field of heat exchangers, and in particular to an integrated heat exchanger and air-conditioning system. Background Art

[0002] As an indispensable household appliance in people's daily life, air conditioners can not only provide cooling in the hot summer to bring coolness to people, but also provide heating in the cold winter to bring warmth to people.

[0003] However, in extremely cold regions or during extreme weather conditions like blizzards, the outdoor ambient temperature is extremely low, significantly limiting the heat transfer of the outdoor heat exchanger. Refrigerant circulation and condensation heat release indoors alone are no longer sufficient to meet heating needs, and a gas furnace is often required for auxiliary heating. The gas furnace heat exchanger and the indoor heat exchanger of the air conditioning unit are separated and need to be installed separately, each with a certain amount of space to ensure heat transfer. This makes installation inconvenient and occupies a large space. Utility Model Content

[0004] The present application provides an integrated heat exchanger and air-conditioning system. The integrated heat exchanger is easy to install and fix, can reduce the installation space occupied, and meet the heating needs in extremely cold weather.

[0005] In the first aspect, the present application provides an integrated heat exchanger, comprising a first heat exchanger, a second heat exchanger, a first connecting assembly and a second connecting assembly, wherein the first heat exchanger is used for introducing refrigerant and air for heat exchange, and the second heat exchanger is used for introducing flue gas and air for heat exchange; the first connecting assembly connects the top of the first heat exchanger and the top of the second heat exchanger, and the second connecting assembly connects the end of the first heat exchanger and the end of the second heat exchanger.

[0006] In some embodiments, the first connecting assembly includes a first connecting piece, a second connecting piece, and a first fastener, wherein the first connecting piece is fixed to the top of the first heat exchanger, the second connecting piece is fixed to the top of the second heat exchanger, and the first connecting piece and the second connecting piece are connected and fixed by the first fastener;

[0007] And / or, the second connection assembly includes a triangular connection plate and a second fastener, and the end of the first heat exchanger and the end of the second heat exchanger are respectively connected and fixed to the connected side edges of the triangular connection plate through the second fastener.

[0008] In some embodiments, the first heat exchanger comprises:

[0009] a pair of first end plates;

[0010] a refrigerant finned tube connected and fixed between the pair of first end plates;

[0011] a liquid distribution pipe assembly, connected to the first end of the refrigerant fin tube, for distributing the liquid refrigerant flowing toward the refrigerant fin tube or collecting the liquid refrigerant flowing out of the refrigerant fin tube;

[0012] The collecting pipe assembly is connected to the second end of the refrigerant fin tube and is used to collect the gaseous refrigerant flowing out of the refrigerant fin tube or to divert the gaseous refrigerant flowing into the refrigerant fin tube.

[0013] In some embodiments, the second heat exchanger comprises:

[0014] a pair of second end plates;

[0015] a flue gas finned tube, connected and fixed between the pair of second end plates;

[0016] a flue gas inlet pipe, connected to the first end of the flue gas fin tube;

[0017] The smoke outlet pipe is connected to the second end of the smoke fin tube.

[0018] In some embodiments, the end of the first heat exchanger is connected to the first sub-heat exchanger, the first sub-heat exchanger is arranged to fit the triangular connecting plate, and the first sub-heat exchanger is connected in series with the refrigerant fin tube.

[0019] In some embodiments, the end of the second heat exchanger is connected to the second sub-heat exchanger, the second sub-heat exchanger is arranged in contact with the triangular connecting plate, and the second sub-heat exchanger is connected in series with the flue gas fin tube.

[0020] In a second aspect, the present application provides an air-conditioning system comprising a compressor, an indoor heat exchanger, an outdoor heat exchanger, a throttling device and a four-way valve, wherein the indoor heat exchanger adopts the integrated heat exchanger described in any one of the above items; and / or the outdoor heat exchanger adopts the integrated heat exchanger described in any one of the above items.

[0021] In some embodiments, a burner is further included, and a smoke exhaust port of the burner is connected to the second heat exchanger.

[0022] In some embodiments, an indoor fan is provided at the indoor heat exchanger, and the indoor fan is used to drive indoor air from the first heat exchanger to the second heat exchanger.

[0023] In some embodiments, the second heat exchanger is connected to a smoke exhaust pipe, and the smoke exhaust pipe is provided with a smoke exhaust fan.

[0024] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art: the first connecting component is used to connect the tops of the first heat exchanger and the second heat exchanger, and the second connecting component is used to connect the ends of the first heat exchanger and the second heat exchanger, so that the first heat exchanger and the second heat exchanger are connected and fixed in the same direction, which facilitates the simultaneous installation and fixation of the first heat exchanger and the second heat exchanger, improves the convenience of installation and fixation, and at the same time reduces the installation position and the requirements for the installation space margin, thereby reducing the installation space occupancy overall.

[0025] The first heat exchanger of the integrated heat exchanger can be used as the indoor heat exchanger of the air-conditioning system. In cooling mode, refrigerant is introduced into the first heat exchanger for evaporation and heat absorption, and the second heat exchanger does not participate in heat exchange; in heating mode, refrigerant is introduced into the first heat exchanger for condensation and heat release. Due to extremely cold weather, the heat exchange of the outdoor heat exchanger is restricted, resulting in insufficient heat release of the refrigerant in the indoor heat exchanger, that is, the first heat exchanger. At this time, flue gas and indoor air can be introduced through the second heat exchanger for heat exchange, that is, the integrated heat exchanger can realize dual-mode heating of gas and refrigerant to meet the heating needs in extremely cold weather.

[0026] On the other hand, the first heat exchanger of the integrated heat exchanger can also be used as an outdoor heat exchanger of the air-conditioning system. In cooling mode, the second heat exchanger does not participate in the operation, and the refrigerant is introduced into the first heat exchanger, and the refrigerant condenses in the first heat exchanger and releases heat to the outdoor environment; in heating mode, the second heat exchanger introduces high-temperature flue gas and air for heat exchange and radiates heat to the first heat exchanger, increasing the amount of heat absorbed by the refrigerant in the first heat exchanger, which improves the heat exchange efficiency of the outdoor heat exchanger and ensures the heat release and heating needs of the refrigerant in the indoor heat exchanger; there is no need to set up a flue gas heat exchanger indoors, which can also reduce the indoor installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0029] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0030] Figure 1A top view of the integrated heat exchanger provided in an embodiment of the present application;

[0031] Figure 2 for Figure 1 Left view of;

[0032] Figure 3 for Figure 1 Right view of;

[0033] Figure 4 for Figure 1 Front view of

[0034] Figure 5 for Figure 1 Rear view;

[0035] Figure 6 A schematic diagram of an air conditioning system provided in an embodiment of the present application.

[0036] Description of reference numerals:

[0037] 10-first heat exchanger; 11-first sub-heat exchanger; 12-first end plate; 13-refrigerant finned tube; 14-liquid distribution pipe assembly; 15-gas collecting pipe assembly;

[0038] 20 - second heat exchanger; 21 - second sub-heat exchanger; 22 - second end plate; 23 - flue gas finned tube; 24 - flue gas inlet pipe; 25 - flue gas outlet pipe;

[0039] 30-first connecting piece; 31-second connecting piece; 32-first fastener;

[0040] 40-triangular connecting plate; 41-second fastener;

[0041] 50-throttling element; 51-outdoor heat exchanger; 52-four-way valve; 53-compressor;

[0042] 60-burner; 61-gas valve; 62-gas inlet pipe;

[0043] 70-Exhaust pipe. DETAILED DESCRIPTION

[0044] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0045] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, these are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0046] For ease of description, spatially relative terms may be used herein to describe the relative position or movement of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," "above," "front," "back," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figures undergoes a positional flip or a change in posture or a change in motion, then these directional indications will also change accordingly. For example, an element described as "below" or "below" another element or feature will subsequently be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein will be interpreted accordingly.

[0047] In order to solve the technical problem in the prior art that the air-conditioning system cooperates with the gas furnace device for auxiliary heating, which makes the installation and fixation of the heat exchanger inconvenient and occupies a large space, the present application provides an integrated heat exchanger that can realize the air-conditioning system cooperating with the gas furnace for heating, meet the heating needs in extremely cold weather, improve the convenience of installation and fixation of the heat exchanger and reduce the installation space occupied.

[0048] The embodiment of the present application provides an integrated heat exchanger, such as Figures 1 to 5 As shown, the heat exchanger includes a first heat exchanger 10, a second heat exchanger 20, a first connecting assembly, and a second connecting assembly. The first heat exchanger 10 is used to introduce refrigerant and exchange heat with air, while the second heat exchanger 20 is used to introduce flue gas and exchange heat with air. The first connecting assembly securely connects the top of the first heat exchanger 10 to the top of the second heat exchanger 20, while the second connecting assembly securely connects the end of the first heat exchanger 10 to the end of the second heat exchanger 20.

[0049] The integrated heat exchanger provided in the embodiment of the present application utilizes a first connecting component to connect the tops of the first heat exchanger 10 and the second heat exchanger 20, and a second connecting component to connect the ends of the first heat exchanger 10 and the second heat exchanger 20, thereby connecting and fixing the first heat exchanger 10 and the second heat exchanger 20 in the same direction, making it easier to install and fix the first heat exchanger 10 and the second heat exchanger 20 simultaneously, thereby improving the convenience of installation and fixation, and at the same time reducing the installation position and the requirements for installation space margin, thereby reducing the installation space occupancy overall.

[0050] The first heat exchanger 10 of the integrated heat exchanger can be used as an indoor heat exchanger of the air-conditioning system. In cooling mode, refrigerant is introduced into the first heat exchanger 10 for evaporation and heat absorption, and the second heat exchanger 20 does not participate in heat exchange; in heating mode, refrigerant is introduced into the first heat exchanger 10 for condensation and heat release. Due to the extremely cold weather, the heat exchange of the outdoor heat exchanger 51 is restricted, resulting in insufficient heat release of the refrigerant in the indoor heat exchanger, that is, the first heat exchanger 10. At this time, flue gas and indoor air can be introduced through the second heat exchanger 20 for heat exchange, that is, the integrated heat exchanger can perform dual-mode heating of flue gas and refrigerant to meet the heating needs in extremely cold weather.

[0051] On the other hand, the first heat exchanger 10 of the integrated heat exchanger can also be used as the outdoor heat exchanger 51 of the air-conditioning system. In the cooling mode, the second heat exchanger 20 does not participate in the operation, and the first heat exchanger 10 passes the refrigerant, and the refrigerant condenses in the first heat exchanger 10 and releases heat to the outdoor environment; in the heating mode, the second heat exchanger 20 passes the high-temperature flue gas and air for heat exchange and radiates heat to the first heat exchanger 10, thereby increasing the heat absorption of the refrigerant in the first heat exchanger 10, thereby improving the heat exchange energy efficiency of the outdoor heat exchanger 51, ensuring the heat release and heating needs of the refrigerant in the indoor heat exchanger, and eliminating the need to set up a flue gas heat exchanger indoors, which can also reduce the indoor installation space occupied.

[0052] refer to Figure 1 、 Figure 4 and Figure 5 In one embodiment provided herein, the first heat exchanger 10 and the second heat exchanger 20 are connected and secured at a predetermined angle via a first connecting assembly and a second connecting assembly, making the integrated heat exchanger more securely mounted. Specifically, the first connecting assembly includes a first connecting piece 30, a second connecting piece 31, and several first fasteners 32, while the second connecting assembly includes a pair of triangular connecting plates 40 and several second fasteners 41.

[0053] The first heat exchanger 10 and the second heat exchanger 20 have similar overall dimensions. The length of the first connecting piece 30 is comparable to that of the first heat exchanger 10, and the width of the first connecting piece 30 is greater than the width of the top of the first heat exchanger 10. The first connecting piece 30 can be secured to the top of the first heat exchanger 10 by welding. The length of the second connecting piece 31 is comparable to that of the second heat exchanger 20, and the width of the second connecting piece 31 is greater than the width of the top of the second heat exchanger 20. The first fastener 32 can be a fastening bolt. The side of the first connecting piece 30 near the second heat exchanger 20 is provided with multiple fixing holes at a predetermined interval, and the side of the second connecting piece 31 near the first heat exchanger 10 is provided with multiple fixing holes at the same interval. When connecting the tops of the first heat exchanger 10 and the second heat exchanger 20, the first connecting piece 30 and the second connecting piece 31 are partially overlapped and their fixing holes are aligned one by one. Then, the fastening bolts are inserted through the corresponding fixing holes and secured. The first fastener 32 can also be a fastening screw. There is no need to set fixing holes at the corresponding connecting edges of the first connecting piece 30 and the second connecting piece 31. After the first connecting piece 30 and the second connecting piece 31 are partially overlapped, they can be directly fixed with a fastening screw.

[0054] After the tops of the first and second heat exchangers 10 and 20 are connected and secured via the first connecting assembly, the ends of the first and second heat exchangers 10 and 20 are roughly aligned, and the first and second heat exchangers 10 and 20 maintain a predetermined angle. The two triangular connecting plates 40 are then connected between the first and second ends of the first and second heat exchangers 10 and 20, respectively, using the second fasteners 41. Specifically, a set of side edges of the triangular connecting plates 40 are connected and secured to the end of the first end of the first heat exchanger 10 using the second fasteners 41. Then, adjacent side edges of the triangular connecting plates 40 are connected and secured to the end of the first end of the second heat exchanger 20 using the second fasteners 41, thereby achieving a secure connection between the first and second ends of the first and second heat exchangers 10 and 20. Then, a group of side plates of another group of triangular connecting plates 40 are connected and fixed to the end of the second end of the first heat exchanger 10 through the second fastener 41, and the adjacent side edges of the triangular connecting plate 40 are connected and fixed to the end of the second end of the second heat exchanger 20, thereby realizing the connection and fixation of the second ends of the first heat exchanger 10 and the second heat exchanger 20.

[0055] The connection between the triangular connecting plate 40 and the first heat exchanger 10 and the second heat exchanger 20 through the second fastener 41 can refer to the connection between the first connecting piece 30 and the second connecting piece 31 through the first fastener 32, and will not be further described in this application.

[0056] In some embodiments, the first heat exchanger 10 and the second heat exchanger 20 preferably use finned tube heat exchangers to increase the heat exchange area with the air and improve the heat exchange efficiency. The first heat exchanger 10 includes a pair of first end plates 12, refrigerant finned tubes 13, a liquid distribution pipe assembly 14 and a gas collection pipe assembly 15. Figure 2 and Figure 3 As shown. Among them, a pair of first end plates 12 are arranged parallel to each other at a preset distance, and the preset distance is approximately equal to the length of the first heat exchanger 10. A number of fixing holes are provided through the first end plate 12. The refrigerant finned tube 13 includes a straight tube section and a U-shaped tube section provided with fins. The heat exchange area is increased by providing fins on the straight tube section. The straight tube section array is arranged between the pair of first end plates 12 and is provided corresponding to the fixing holes. The U-shaped tube section is provided at the fixing holes and connects the adjacent straight tube sections. The U-shaped tube section plays a reversing role. The refrigerant finned tube 13 has a first end and a second end. The liquid distributor assembly 14 is connected to the first end of the refrigerant finned tube 13, and the gas collecting pipe assembly 15 is connected to the second end of the refrigerant finned tube 13.

[0057] The liquid distribution pipe assembly 14 includes a liquid distribution head and a plurality of connecting pipes, one end of each connecting pipe being connected to the liquid distribution head and the other end being connected to the first end of a group of refrigerant finned tubes 13. The liquid distribution pipe assembly 14 is connected to the first ends of the plurality of refrigerant finned tubes 13 via the liquid distribution head and the connecting pipes. The liquid distribution pipe assembly 14 serves to divert the liquid refrigerant when the liquid refrigerant is input to the refrigerant finned tubes 13; and the liquid distribution pipe assembly 14 serves to collect the liquid refrigerant when the refrigerant finned tubes 13 output the liquid refrigerant through the liquid distribution pipe assembly 14.

[0058] The manifold assembly 15 includes a manifold and several connecting tubes, one end of which is connected to the manifold, and the other end is connected to the second end of a group of refrigerant finned tubes 13. The manifold assembly 15 is connected to the second ends of the multiple groups of refrigerant finned tubes 13 through the manifold and connecting tubes. The manifold assembly 15 diverts the gaseous refrigerant when it is input to the refrigerant finned tubes 13, and collects the gaseous refrigerant when the refrigerant finned tubes 13 output the gaseous refrigerant through the manifold assembly 15.

[0059] The number of branches of the liquid distribution pipe assembly 14, i.e., the number of connecting pipes, is equal to the number of branches of the gas collection pipe assembly 15, i.e., the number of connecting pipes, and is equal to the number of refrigerant flow channels of the refrigerant finned tubes 13 of the first heat exchanger 10. The liquid distribution pipe assembly 14 and the gas collection pipe assembly 15 divide and gather the refrigerant, thereby evenly transporting the refrigerant to different refrigerant finned tubes 13 for separate heat exchange, thereby improving heat exchange efficiency.

[0060] The second heat exchanger 20 includes a pair of second end plates 22, flue gas finned tubes 23, a flue gas inlet pipe 24, and a flue gas outlet pipe 25. The pair of second end plates 22 are arranged parallel to each other at a preset spacing approximately equal to the length of the second heat exchanger 20. Several fixing holes are provided through the second end plates 22. The flue gas finned tubes 23 also include straight tube sections and U-shaped tube sections with fins. The fins provided on the straight tube sections increase the heat exchange area. The straight tube sections are arranged in an array between the pair of second end plates 22 and corresponding to the fixing holes. The U-shaped tube sections are provided through the fixing holes and connect adjacent straight tube sections, serving as a reversing device. The flue gas finned tubes 23 have a first end and a second end. The flue gas inlet pipe 24 is connected to the first end of the flue gas finned tubes 23, and the flue gas outlet pipe 25 is connected to the second end of the flue gas finned tubes 23.

[0061] The flue gas inlet pipe 24 and the flue gas outlet pipe 25 can also be provided with the same number of branches, which is equal to the number of flue gas flow channels of the flue gas finned tubes 23. The flue gas is divided by the flue gas inlet pipe 24 and sent to different flue gas finned tubes 23 for heat exchange, and the flue gas is collected and discharged by the flue gas outlet pipe 25, thereby improving heat exchange efficiency.

[0062] like Figure 1 、 Figure 4 and Figure 5 As shown, considering that the first heat exchanger 10 and the second heat exchanger 20 are connected relative to each other at one side, the air flow between the relative sides of the two is restricted to a certain extent, resulting in a decrease in heat exchange efficiency. In order to ensure the heat exchange efficiency, the integrated heat exchanger provided in the embodiment of the present application also includes a first sub-heat exchanger 11 and a second sub-heat exchanger 21. The first sub-heat exchanger 11 and the refrigerant finned tube 13 of the first heat exchanger 10 are connected in series, and the first sub-heat exchanger 11 is arranged in a triangular connection plate 40 at one end of the first heat exchanger 10 and the second heat exchanger 20. The second sub-heat exchanger 21 and the flue gas finned tube 23 of the second heat exchanger 20 are connected in series, and the second sub-heat exchanger 21 is arranged in a triangular connection plate 40 at the other end of the first heat exchanger 10 and the second heat exchanger 20.

[0063] The first sub-heat exchanger 11 increases the heat exchange area between the refrigerant and the air, improving heat exchange efficiency. Furthermore, the first sub-heat exchanger 11 is positioned in a manner that fits the triangular connecting plate 40, fully utilizing the space at one end of the first heat exchanger 10 and the second heat exchanger 20 without significantly increasing the volume of the integrated heat exchanger. Furthermore, the second sub-heat exchanger 21 increases the heat exchange area between the flue gas and the air, improving heat exchange efficiency. Furthermore, the second sub-heat exchanger 21 fits the triangular connecting plate 40, fully utilizing the space at the other end of the first heat exchanger 10 and the second heat exchanger 20 without significantly increasing the volume of the integrated heat exchanger.

[0064] In some embodiments, an integrated heat exchanger may be provided with a first insulation board as needed on the side of the second heat exchanger 20 facing the first heat exchanger 10. The first heat exchanger 10 of the integrated heat exchanger serves as the indoor heat exchanger for the air conditioning system, while the second heat exchanger 20 serves as the flue gas heat exchanger. In heating mode, the first insulation board can isolate the heat released by the second heat exchanger 20 to a certain extent, reducing the impact of the heat released by the second heat exchanger 20 on the condensation heat released by the refrigerant in the first heat exchanger 10, thereby ensuring the heat release of the first heat exchanger 10. The first insulation board and the second heat exchanger 20 preferably utilize a detachable connection to facilitate removal of the first insulation board in cooling mode, thereby ensuring the ventilation and heat exchange efficiency of the first heat exchanger 10.

[0065] In some other embodiments, the integrated heat exchanger may be provided with a second heat insulation plate as needed on the side of the second heat exchanger 20 facing away from the first heat exchanger 10. The first heat exchanger 10 of the integrated heat exchanger can serve as the outdoor heat exchanger 51 of the air-conditioning system, and the second heat exchanger 20 serves as the flue gas heat exchanger. In the heating mode, the second heat exchanger 20 can allow flue gas to release heat, thereby increasing the ambient temperature of the first heat exchanger 10, promoting the evaporation and heat absorption of the refrigerant in the first heat exchanger 10, and thereby increasing the heat release of the air-conditioning system in the indoor heat exchanger to ensure heating needs. The second heat insulation plate cooperates with the triangular connecting plate to form an insulation space, so that the heat released by the second heat exchanger 20 is transferred toward the first heat exchanger 10. The second heat insulation plate and the second heat exchanger 20 are connected in a detachable manner so that the second heat insulation plate can be removed in the cooling mode to ensure the ventilation and heat exchange efficiency of the first heat exchanger 10.

[0066] The present application also provides an air conditioning system. Figure 6 As shown, the air conditioning system includes a compressor 53, an indoor heat exchanger, an outdoor heat exchanger 51, a throttling element 50, and a four-way valve 52. The indoor heat exchanger uses the integrated heat exchanger provided in the above embodiment. The four-way valve 52 is used to switch the refrigerant flow path and thus the cooling and heating modes. Furthermore, the air conditioning system includes a burner 60, which is connected to a gas inlet pipe 62, which is provided with a gas valve 61. The burner 60 has a smoke exhaust port that communicates with the smoke inlet of the second heat exchanger 20. The smoke outlet of the second heat exchanger 20 is connected to a smoke exhaust pipe 70, which is provided with a smoke exhaust fan to facilitate the smooth discharge of smoke through the smoke exhaust pipe 70 to the outside.

[0067] In cooling mode, the first heat exchanger 10 acts as an evaporator, the gas valve 61 is closed, and the burner 60 and the second heat exchanger 20 are not in operation. In heating mode, the air conditioning system forms a refrigerant circuit through the compressor 53, the four-way valve 52, the outdoor heat exchanger 51, the throttling element 50, and the first heat exchanger 10. The refrigerant absorbs heat in the outdoor heat exchanger 51 and condenses and releases heat at the first heat exchanger 10, achieving refrigerant heating. The gas valve 61 is opened, and the gas inlet pipe 62 feeds gas to the burner 60 for combustion. The generated high-temperature flue gas is fed into the second heat exchanger 20 to release heat and is finally discharged through the exhaust pipe 70 and the exhaust fan. The flue gas heating is carried out with the help of the second heat exchanger 20, thus achieving dual-mode heating.

[0068] The outdoor heat exchanger 51 can also utilize the integrated heat exchanger provided in the aforementioned embodiment. In heating mode, the first heat exchanger 10 acts as an outdoor evaporator, absorbing heat from the environment. The second heat exchanger 20 heats the first heat exchanger 10, increasing the refrigerant's heat absorption efficiency in the first heat exchanger 10. This, in turn, promotes heat release to the indoor heat exchanger during refrigerant circulation in the air conditioning system, thereby meeting heating needs. In cooling mode, the second heat exchanger 20 and the burner 60 are not in operation.

[0069] Furthermore, the air conditioning system also includes an indoor fan. In heating mode, the indoor fan is used to blow indoor air from the first heat exchanger 10 to the second heat exchanger 20. This configuration allows indoor air to flow from the first heat exchanger 10, where the temperature is lower, to the second heat exchanger 20, where the temperature is higher. This prevents hot air after heat exchange with the second heat exchanger 20 from flowing into the first heat exchanger 10 and affecting the condensation heat exchange of the refrigerant in the first heat exchanger 10. An air duct can also be provided between the first heat exchanger 10 and the second heat exchanger 20 of the integrated heat exchanger, with the indoor fan provided at the air inlet of the air duct. Temperature sensors can be provided at both the air inlet and the air outlet of the air duct as needed.

[0070] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0071] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0072] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. An integrated heat exchanger, characterized in that: It includes a first heat exchanger, a second heat exchanger, a first connecting component and a second connecting component. The first heat exchanger is used to pass refrigerant and air for heat exchange, and the second heat exchanger is used to pass flue gas and air for heat exchange; the first connecting component connects the top of the first heat exchanger and the top of the second heat exchanger, and the second connecting component connects the end of the first heat exchanger and the end of the second heat exchanger.

2. The integrated heat exchanger according to claim 1, characterized in that The first connecting assembly includes a first connecting piece, a second connecting piece, and a first fastener. The first connecting piece is fixed to the top of the first heat exchanger, and the second connecting piece is fixed to the top of the second heat exchanger. The first connecting piece and the second connecting piece are connected and fixed by the first fastener. And / or, the second connection assembly includes a triangular connection plate and a second fastener, and the end of the first heat exchanger and the end of the second heat exchanger are respectively connected and fixed to the connected side edges of the triangular connection plate through the second fastener.

3. The integrated heat exchanger according to claim 2, characterized in that: The first heat exchanger comprises: a pair of first end plates; a refrigerant finned tube connected and fixed between the pair of first end plates; a liquid distribution pipe assembly, connected to the first end of the refrigerant fin tube, for distributing the liquid refrigerant flowing toward the refrigerant fin tube or collecting the liquid refrigerant flowing out of the refrigerant fin tube; The collecting pipe assembly is connected to the second end of the refrigerant fin tube and is used to collect the gaseous refrigerant flowing out of the refrigerant fin tube or to divert the gaseous refrigerant flowing into the refrigerant fin tube.

4. The integrated heat exchanger according to claim 3, characterized in that The second heat exchanger comprises: a pair of second end plates; a flue gas finned tube, connected and fixed between the pair of second end plates; a flue gas inlet pipe, connected to the first end of the flue gas fin tube; The smoke outlet pipe is connected to the second end of the smoke fin tube.

5. The integrated heat exchanger according to claim 4, characterized in that: The end of the first heat exchanger is connected to the first sub-heat exchanger, the first sub-heat exchanger is arranged in contact with the triangular connecting plate, and the first sub-heat exchanger is connected in series with the refrigerant fin tube.

6. The integrated heat exchanger according to claim 5, characterized in that: The end of the second heat exchanger is connected to the second sub-heat exchanger, the second sub-heat exchanger is arranged in contact with the triangular connecting plate, and the second sub-heat exchanger is connected in series with the flue gas fin tube.

7. An air conditioning system comprising a compressor, an indoor heat exchanger, an outdoor heat exchanger, a throttle element and a four-way valve, characterized in that: The indoor heat exchanger uses the integrated heat exchanger described in any one of claims 1 to 6.

8. The air conditioning system according to claim 7, characterized in that It also includes a burner, and the smoke exhaust port of the burner is connected to the second heat exchanger.

9. The air conditioning system according to claim 7, characterized in that The indoor heat exchanger is provided with an indoor fan, and the indoor fan is used to drive indoor air from the first heat exchanger to the second heat exchanger.

10. The air conditioning system according to claim 9, characterized in that The second heat exchanger is connected to a smoke exhaust pipe, and the smoke exhaust pipe is provided with a smoke exhaust fan.

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