Heat exchange device and air conditioning unit

Abstract

The heat exchange device comprises a first heat exchange area, a first supercooling area and a second heat exchange area, the first supercooling area is located between the first heat exchange area and the second heat exchange area, when the first heat exchange area is defrosted, the first supercooling area heats and defrosts, at the moment, the second heat exchange area refrigerates, and when the second heat exchange area defrosts, the first supercooling area heats and defrosts. And when the second heat exchange area is defrosted, the first supercooling area heats and defrosts, and at the moment, the first heat exchange area refrigerates. According to the subarea defrosting air conditioner, it can be effectively guaranteed that when different areas are subjected to subarea defrosting, the supercooling area located between the two areas is in the heating defrosting state all the time, it can be guaranteed that effective and thorough defrosting is achieved at the junction, and the problem that defrosting is not thorough at the junction of the boundary areas of the subarea defrosting air conditioner is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to a heat exchange device and an air conditioning unit. Background Art

[0002] At present, during the daily use of air conditioners, if the air conditioner is operated in heating mode under low ambient temperature, frost will appear on the outdoor heat exchanger. At this time, the air conditioning system needs to enter the defrost mode every time it runs for a period of time. When defrosting the outdoor heat exchanger, the air conditioner's operating mode is changed to cooling mode to defrost the outdoor unit, which causes indoor temperature fluctuations, greatly affecting the comfort of users using the air conditioner. Existing air conditioners have an air conditioning structure with zoned defrosting. While defrosting one of the outdoor heat exchangers or part of the outdoor heat exchanger, the other outdoor heat exchanger or another part of the outdoor heat exchanger can be cooled to ensure that the indoor heating temperature is constant, which can solve the problem of indoor temperature fluctuations. However, a major problem with zoned defrosting is that there will always be areas that are not defrosted cleanly at the junction of the boundary areas, resulting in incomplete frosting and ice accumulation.

[0003] Since the zoned defrosting air conditioner in the prior art has technical problems such as incomplete defrosting at the junction of the boundary areas, the utility model studies and designs a heat exchange device and an air conditioning unit. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the defect of incomplete defrosting at the junction of the boundary areas in the zoned defrosting air conditioner in the prior art, thereby providing a heat exchange device and an air conditioning unit.

[0005] In order to solve the above problems, the utility model provides a heat exchange device, which includes:

[0006] A first heat exchange zone, a first subcooling zone and a second heat exchange zone, wherein the first subcooling zone is located between the first heat exchange zone and the second heat exchange zone, when the first heat exchange zone is defrosted, the first subcooling zone is heated and defrosted, and at this time the second heat exchange zone is refrigerated, and when the second heat exchange zone is defrosted, the first subcooling zone is heated and defrosted, and at this time the first heat exchange zone is refrigerated.

[0007] In some embodiments,

[0008] It also includes a second subcooling zone, which is located on a side of the second heat exchange zone away from the first heat exchange zone. When the first heat exchange zone is defrosted, the second subcooling zone is heated and defrosted. When the second heat exchange zone is defrosted, the second subcooling zone is also heated and defrosted.

[0009] In some embodiments,

[0010] The first heat exchange zone and the second heat exchange zone are arranged up and down, and the first heat exchange zone is located above the second heat exchange zone; the first supercooling zone is located below the first heat exchange zone, and the second supercooling zone is located below the second heat exchange zone, and the first supercooling zone is located above the second heat exchange zone.

[0011] In some embodiments,

[0012] The first supercooling zone includes a first heat exchange pipe segment, one end of which is connected to one end of a first pipeline, and the other end of which is connected to one end of a second pipeline. The second supercooling zone includes a second heat exchange pipe segment, one end of which is connected to the other end of the first pipeline, and the other end of which is connected to the other end of the second pipeline. The first pipeline is also connected to a third pipeline, and the second pipeline is also connected to a fourth pipeline.

[0013] In some embodiments,

[0014] The first heat exchange zone includes a third heat exchange pipe segment, one end of the third heat exchange pipe segment is connected to one end of the fifth pipe, and the other end of the third heat exchange pipe segment is connected to one end of the sixth pipe, and the second heat exchange zone includes a fourth heat exchange pipe segment, one end of the fourth heat exchange pipe segment is connected to the other end of the fifth pipe, and the other end of the fourth heat exchange pipe segment is connected to the other end of the sixth pipe;

[0015] The fifth pipeline is also connected to a seventh pipeline, a first on-off valve is provided on a pipe section of the fifth pipeline between one end of the third heat exchange pipe section and the seventh pipeline, and a second on-off valve is provided on a pipe section of the fifth pipeline between one end of the fourth heat exchange pipe section and the seventh pipeline;

[0016] One end of the fourth pipeline is connected to the second pipeline, and the other end is connected to the sixth pipeline. A third on-off valve is provided on the section of the sixth pipeline between the other end of the third heat exchange pipe segment and the fourth pipeline, and a fourth on-off valve is provided on the section of the sixth pipeline between the other end of the fourth heat exchange pipe segment and the fourth pipeline.

[0017] In some embodiments,

[0018] It also includes an eighth pipeline and a ninth pipeline, one end of the eighth pipeline is connected to a position on the fifth pipeline and between the first on-off valve and the third heat exchange pipe section, and the other end of the eighth pipeline is connected to a position on the sixth pipeline and between the fourth on-off valve and the fourth heat exchange pipe section;

[0019] One end of the ninth pipeline is connected to a position on the fifth pipeline and between the second on-off valve and the fourth heat exchange pipe section, and the other end of the ninth pipeline is connected to a position on the sixth pipeline and between the third on-off valve and the third heat exchange pipe section.

[0020] In some embodiments,

[0021] The eighth pipeline is provided with a first one-way throttling device, which only allows fluid to flow from the fifth pipeline to the sixth pipeline. The ninth pipeline is provided with a second one-way throttling device, which only allows fluid to flow from the fifth pipeline to the sixth pipeline.

[0022] In some embodiments,

[0023] The first one-way throttling device includes a first one-way valve and a first capillary tube, and the second one-way throttling device includes a second one-way valve and a second capillary tube.

[0024] The utility model also provides an air conditioning unit, which includes the aforementioned heat exchanger, a compressor, an indoor heat exchanger and a throttle valve.

[0025] It also includes a tenth pipeline and an eleventh pipeline. One end of the indoor heat exchanger is connected to the suction end or the exhaust end of the compressor through the tenth pipeline, and the other end of the indoor heat exchanger is connected to one end of the throttle valve through the eleventh pipeline. The other end of the throttle valve is connected to the third pipeline. One end of the seventh pipeline is connected to the fifth pipeline, and the other end is connected to the exhaust end or the suction end of the compressor.

[0026] The utility model provides a heat exchange device and an air conditioning unit with the following beneficial effects:

[0027] The utility model divides the heat exchange device into zones including a first heat exchange zone, a second heat exchange zone, a first supercooling zone and a second supercooling zone, wherein the first supercooling zone is located between the first heat exchange zone and the second heat exchange zone, and the second supercooling zone is located at a side of the second heat exchange zone away from the first heat exchange zone. When the first heat exchange zone is defrosted, the first and second supercooling zones are maintained to be heated and defrosted, and the second heat exchange zone is maintained to be cooled. When the second heat exchange zone is defrosted, the first and second supercooling zones are also maintained to be heated and defrosted, and the first heat exchange zone is cooled. This can effectively ensure that when different zones are defrosted, the supercooling zone between the two zones is always in a state of heating and defrosting, and can ensure that effective and thorough defrosting is obtained at the junction. The problem of incomplete defrosting at the junction of boundary areas of zoned defrosting air conditioners is solved; and the utility model is preferably arranged in an upper and lower structural form, and the second supercooling zone is located at the bottom, where there is a lot of condensed water and a poor wind field, resulting in incomplete defrosting. The utility model can effectively ensure that the area at the bottom is effectively and thoroughly defrosted by always maintaining the second supercooling zone at the bottom in a heating and defrosting state while defrosting in the two heat exchange zones. At the same time, it effectively solves the problem of incomplete defrosting at the junction and incomplete defrosting at the bottom of the zoned defrosting air conditioner, ensuring that the heat exchange device is cleanly and thoroughly defrosted in these two severe frosting areas, and de-icing is also thorough. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is the overall structural diagram of the heat exchange device of the utility model;

[0029] Figure 2 It is a structural diagram of a one-way throttling device in a heat exchange device of the utility model;

[0030] Figure 3 This is a system cross-sectional view of an air conditioning unit with a heat exchange device according to the utility model;

[0031] Figure 4 This is a flow path structure diagram of the heat exchange device of the utility model in the heating mode;

[0032] Figure 5 It is a flow path structure diagram of the heat exchange device of the utility model in the cooling mode;

[0033] Figure 6 It is a flow path structure diagram of the heat exchange device of the utility model in the upper defrosting mode;

[0034] Figure 7 It is a flow path structure diagram of the heat exchange device of the utility model in the lower defrosting mode.

[0035] The reference numerals are:

[0036] 1. First heat exchange zone; 2. First subcooling zone; 3. Second heat exchange zone; 4. Second subcooling zone; 5. First heat exchange pipe section; 6. Second heat exchange pipe section; 7. Third heat exchange pipe section; 8. Fourth heat exchange pipe section; 9. First on-off valve; 10. Second on-off valve; 11. Third on-off valve; 12. Fourth on-off valve; 13. First one-way throttling device; 14. Second one-way throttling device; 15. First one-way valve; 16. First capillary tube; 17. Second one-way valve 1. a first pipe; 102. a second pipe; 103. a third pipe; 104. a fourth pipe; 105. a fifth pipe; 106. a sixth pipe; 107. a seventh pipe; 108. an eighth pipe; 109. a ninth pipe; 110. a tenth pipe; 111. an eleventh pipe. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0038] 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, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0039] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, 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 the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0040] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model 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, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0041] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. 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 figure. For example, if the device in the accompanying 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.

[0042] 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. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0043] like Figure 1-7 As shown, the utility model provides a heat exchange device and an air conditioning unit thereof, which comprises:

[0044] A first heat exchange zone 1, a first subcooling zone 2 and a second heat exchange zone 3, wherein the first subcooling zone 2 is located between the first heat exchange zone 1 and the second heat exchange zone 3, when the first heat exchange zone 1 is defrosted, the first subcooling zone 2 is heated to defrost, and at this time the second heat exchange zone 3 is refrigerated, and when the second heat exchange zone 3 is defrosted, the first subcooling zone 2 is heated to defrost, and at this time the first heat exchange zone 1 is refrigerated.

[0045] The utility model divides the heat exchange device into zones including a first heat exchange zone, a second heat exchange zone, a first supercooling zone and a second supercooling zone, wherein the first supercooling zone is located between the first heat exchange zone and the second heat exchange zone, and the second supercooling zone is located on the side of the second heat exchange zone away from the first heat exchange zone. When the first heat exchange zone is defrosted, the first and second supercooling zones are maintained to be heated and defrosted, and the second heat exchange zone is maintained to be refrigerated. When the second heat exchange zone is defrosted, the first and second supercooling zones are also maintained to be heated and defrosted, and the first heat exchange zone is refrigerated. This can effectively ensure that when different zones are defrosted, the supercooling zone between the two zones is always in a state of heating and defrosting, and can ensure that effective and thorough defrosting is obtained at the junction, thereby solving the problem of incomplete defrosting at the junction of the partitioned defrosting air conditioner. The utility model designs an outdoor unit heat exchanger, which can enable the outdoor unit to continue to heat during normal defrosting, solve the problem of large indoor temperature fluctuations when entering the defrost mode, and solve the problem of incomplete defrosting at the junction of the partitioned defrosting zones.

[0046] In some embodiments,

[0047] It also includes a second subcooling zone 4, which is located on a side of the second heat exchange zone 3 away from the first heat exchange zone 1. When the first heat exchange zone 1 is defrosted, the second subcooling zone 4 is heated and defrosted. When the second heat exchange zone 3 is defrosted, the second subcooling zone 4 is also heated and defrosted.

[0048] The present invention preferably also includes a second supercooling zone, where there is a lot of condensed water and a poor wind field, resulting in incomplete defrosting. The present invention can effectively ensure that the area at the bottom is effectively and thoroughly defrosted by always maintaining the second supercooling zone in a heating and defrosting state while defrosting in the two heat exchange zones. At the same time, it effectively solves the problems of incomplete defrosting at the junction and incomplete defrosting at the bottom of the zoned defrosting air conditioner, ensuring that the heat exchange device is cleanly and thoroughly defrosted and de-iced in these two severe frosting areas.

[0049] In some embodiments,

[0050] The first heat exchange zone 1 and the second heat exchange zone 3 are arranged up and down, and the first heat exchange zone 1 is located above the second heat exchange zone 3; the first supercooling zone 2 is located below the first heat exchange zone 1, and the second supercooling zone 4 is located below the second heat exchange zone 3, and the first supercooling zone 2 is located above the second heat exchange zone 3.

[0051] The utility model is preferably in the form of an upper and lower arrangement structure, with the second supercooling zone located at the very bottom, where there is a lot of condensed water and a poor wind field, resulting in incomplete defrosting. The utility model can effectively ensure that the area at the bottom is effectively and thoroughly defrosted by always maintaining the second supercooling zone at the bottom in a heating and defrosting state while defrosting in the two heat exchange zones, and effectively solves the problems of incomplete defrosting at the junction and at the bottom of the zoned defrosting air conditioner, ensuring that the heat exchange device is cleanly and thoroughly defrosted in these two severe frosting areas, and de-icing is also thorough.

[0052] In some embodiments,

[0053] When operating in the heating mode, the first heat exchange zone 1, the second heat exchange zone 3, the first supercooling zone 2 and the second supercooling zone 4 all perform cooling; when operating in the cooling mode, the first heat exchange zone 1, the second heat exchange zone 3, the first supercooling zone 2 and the second supercooling zone 4 all perform heating.

[0054] This is the working form of the heat exchange device of the utility model in heating mode and cooling mode respectively. The heat exchange device of the utility model is preferably an outdoor heat exchanger. In the indoor heating mode, the first and second heat exchange zones and the first and second supercooling zones of the outdoor heat exchanger are all in cooling operation, and in the indoor cooling mode, the first and second heat exchange zones and the first and second supercooling zones of the outdoor heat exchanger are all in heating operation, effectively ensuring normal heating and cooling in the room.

[0055] In some embodiments,

[0056] The first supercooling zone 2 includes a first heat exchange pipe segment 5, one end of which is connected to one end of the first pipeline 101, and the other end of the first heat exchange pipe segment 5 is connected to one end of the second pipeline 102. The second supercooling zone 4 includes a second heat exchange pipe segment 6, one end of the second heat exchange pipe segment 6 is connected to the other end of the first pipeline 101, and the other end of the second heat exchange pipe segment 6 is connected to the other end of the second pipeline 102. The first pipeline 101 is also connected to a third pipeline 103, and the second pipeline 102 is also connected to a fourth pipeline 104.

[0057] This is the preferred structural form of the first supercooling zone and the second supercooling zone of the utility model, that is, the first supercooling zone includes a first heat exchange pipe segment, and the second supercooling zone includes a second heat exchange pipe segment. One ends of the first and second heat exchange pipe segments are effectively connected together through the first pipeline, and the other ends of the first and second heat exchange pipe segments are effectively connected together through the second pipeline. The fluid of the first pipeline can be effectively discharged or introduced into the first pipeline through the third pipeline, and the fluid of the second pipeline can be effectively discharged or introduced into the second pipeline through the fourth pipeline.

[0058] In some embodiments,

[0059] The first heat exchange zone 1 includes a third heat exchange pipe segment 7, one end of the third heat exchange pipe segment 7 is connected to one end of the fifth pipeline 105, and the other end of the third heat exchange pipe segment 7 is connected to one end of the sixth pipeline 106; the second heat exchange zone 3 includes a fourth heat exchange pipe segment 8, one end of the fourth heat exchange pipe segment 8 is connected to the other end of the fifth pipeline 105, and the other end of the fourth heat exchange pipe segment 8 is connected to the other end of the sixth pipeline 106;

[0060] The fifth pipeline 105 is also connected to a seventh pipeline 107, a first on-off valve 9 is provided on a section of the fifth pipeline 105 between one end of the third heat exchange pipe section 7 and the seventh pipeline 107, and a second on-off valve 10 is provided on a section of the fifth pipeline 105 between one end of the fourth heat exchange pipe section 8 and the seventh pipeline 107;

[0061] One end of the fourth pipeline 104 is connected to the second pipeline 102, and the other end is connected to the sixth pipeline 106. A third on-off valve 11 is provided on the section of the sixth pipeline 106 between the other end of the third heat exchange pipe segment 7 and the fourth pipeline 104, and a fourth on-off valve 12 is provided on the section of the sixth pipeline 106 between the other end of the fourth heat exchange pipe segment 8 and the fourth pipeline 104.

[0062] This is the preferred structural form of the first heat exchange zone and the second heat exchange zone of the utility model, that is, the first heat exchange zone includes the third heat exchange pipe segment, the second heat exchange zone includes the fourth heat exchange pipe segment, one end of the third and fourth heat exchange pipe segments are effectively connected together through the fifth pipeline, the other end of the third and fourth heat exchange pipe segments are effectively connected together through the sixth pipeline, the fluid of the fifth pipeline can be effectively exported or introduced into the fifth pipeline through the seventh pipeline, the connection between the sixth pipeline and the fourth pipeline can make the two heat exchange zones connected with the two supercooling zones separately or simultaneously, and the first and second on-off valves are respectively arranged on the two pipe segments of the fifth pipeline. , and by respectively arranging the third and fourth on-off valves on the two pipe sections of the sixth pipeline, one of the heat exchange zones can be connected with both supercooling zones for heating, while the other heat exchange zone is connected with the heat exchange zone after heat exchange for cooling, and finally the refrigerant is exported, so as to realize defrosting of one of the heat exchange zones while cooling the other heat exchange zone, so as to ensure normal indoor heating, realize zoned defrosting, and ensure that the two supercooling zones are always in the state of heating and defrosting, solve the problem of incomplete defrosting and deicing in the supercooling zone between the zoned heat exchange zones and the bottom supercooling zone, and improve the defrosting and deicing effects of the two areas.

[0063] In some embodiments,

[0064] It also includes an eighth pipeline 108 and a ninth pipeline 109, one end of the eighth pipeline 108 is communicated with a position on the fifth pipeline 105 and between the first on-off valve 9 and the third heat exchange pipe section 7, and the other end of the eighth pipeline 108 is communicated with a position on the sixth pipeline 106 and between the fourth on-off valve 12 and the fourth heat exchange pipe section 8;

[0065] One end of the ninth pipeline 109 is connected to a position on the fifth pipeline 105 and located between the second on-off valve 10 and the fourth heat exchange pipe section 8, and the other end of the ninth pipeline 109 is connected to a position on the sixth pipeline 106 and located between the third on-off valve 11 and the third heat exchange pipe section 7.

[0066] This is a further preferred structural form of the heat exchange device of the utility model. Through the setting of the eighth pipeline, the refrigerant of the fifth pipeline after heating and defrosting through the first heat exchange zone can be exported to the second heat exchange zone, and cooling is carried out in the second heat exchange zone, thereby realizing zoned defrosting while ensuring the effect of indoor heating; through the setting of the ninth pipeline, the refrigerant of the sixth pipeline after heating and defrosting through the second heat exchange zone can be exported to the first heat exchange zone, and cooling is carried out in the first heat exchange zone, thereby realizing zoned defrosting while ensuring the effect of indoor heating.

[0067] In some embodiments,

[0068] The eighth pipeline 108 is provided with a first one-way throttling device 13, and the first one-way throttling device 13 only allows the fluid to flow from the fifth pipeline 105 to the sixth pipeline 106. The ninth pipeline 109 is provided with a second one-way throttling device 14, and the second one-way throttling device 14 only allows the fluid to flow from the fifth pipeline 105 to the sixth pipeline 106.

[0069] The utility model further provides first and second one-way throttling devices respectively arranged on the eighth pipeline and the ninth pipeline, so that the refrigerant after heating and defrosting from the first heat exchange zone can be throttled and reduced in pressure through the first one-way throttling device, and guided to the second heat exchange zone for cooling. The one-way valve prevents the refrigerant in the second heat exchange zone from flowing to the first heat exchange zone. The utility model also provides first and second one-way throttling devices respectively arranged on the eighth pipeline and the ninth pipeline, so that the refrigerant after heating and defrosting from the second heat exchange zone can be throttled and reduced in pressure through the first one-way throttling device, and guided to the first heat exchange zone for cooling. The one-way valve prevents the refrigerant in the first heat exchange zone from flowing to the second heat exchange zone.

[0070] In some embodiments,

[0071] The first one-way throttling device 13 includes a first one-way valve 15 and a first capillary tube 16 , and the second one-way throttling device 14 includes a second one-way valve 17 and a second capillary tube 18 .

[0072] This is the preferred structural form of the first and second one-way throttling devices of the utility model, that is, by connecting the first one-way valve and the first capillary tube (the second one-way valve and the second capillary tube) in series, it is possible to prevent the refrigerant from flowing back while throttling and reducing its pressure, thereby achieving regional defrosting while ensuring the normal heating effect of the room. The one-way throttling device of the utility model is composed of a capillary tube and a one-way valve connected in series to form a one-way conduction effect. Using a one-way throttling device for control can significantly reduce costs compared to using a throttle valve for throttling control.

[0073] The utility model also provides an air conditioning unit, which includes the aforementioned heat exchange device 100, a compressor 19, an indoor heat exchanger 20 and a throttle valve 21.

[0074] It also includes a tenth pipeline 110 and an eleventh pipeline 111. One end of the indoor heat exchanger 20 is connected to the intake end or the exhaust end of the compressor 19 through the tenth pipeline 110, and the other end of the indoor heat exchanger 20 is connected to one end of the throttle valve 21 through the eleventh pipeline 111. The other end of the throttle valve 21 is connected to the third pipeline 103. One end of the seventh pipeline 107 is connected to the fifth pipeline 105, and the other end is connected to the exhaust end or the intake end of the compressor 19.

[0075] The utility model designs a heat exchanger branch system with a one-way throttling device, and an air-conditioning unit using the heat exchanger. In the process of defrosting, a part of the heat of the outdoor unit condenser is used for defrosting, and a part of the heat is provided to the indoor room, so that the unit does not switch modes during the defrosting process, and the indoor heating is kept stable. A major problem of zoned defrosting is that there will always be an area with ice accumulated due to poor defrosting at the junction of the boundary areas. The utility model designs an outdoor unit flow path with a distributed supercooling heat exchanger, which can solve the problem of ice accumulation in the boundary areas.

[0076] The utility model preferably uses a two-way outdoor heat exchanger. The outdoor heat exchanger is divided into two upper and lower areas. The branch is provided with 4 on-off valves, two one-way throttling devices, and a throttling valve. The schematic diagram of the air conditioning system is as follows: Figure 1 The utility model adopts a distributed supercooling flow path design in the design of the external unit flow path, that is, in the refrigeration mode, each branch is individually supercooled and then collected into the condenser collecting pipe, which can effectively ensure that when different areas are defrosted in different zones, the supercooling zone between the two zones is always in the state of heating and defrosting, and can ensure effective and thorough defrosting at the junction, solving the problem of incomplete defrosting at the junction of the boundary areas of the zoned defrosting air conditioner, and can also effectively ensure effective and thorough defrosting of the area located at the bottom, and at the same time effectively solves the problem of incomplete defrosting at the junction and incomplete defrosting at the bottom of the zoned defrosting air conditioner, ensuring that the heat exchange device is cleanly and thoroughly defrosted in these two severe frosting areas, and de-icing is also thorough.

[0077] The utility model also provides a control method for the air conditioning unit as described above, which comprises:

[0078] A determination step of determining whether the operation mode of the air conditioning unit is a heating mode, a cooling mode, an upper defrost mode, or a lower defrost mode;

[0079] Control step, when the operation mode is the heating mode, the first on-off valve 9, the second on-off valve 10, the third on-off valve 11 and the fourth on-off valve 12 are all controlled to be open, the throttle valve 21 is throttled normally, and the first supercooling zone 2, the second supercooling zone 4, the first heat exchange zone 1 and the second heat exchange zone 3 are all refrigerated;

[0080] When the operation mode is the cooling mode, the first on-off valve 9, the second on-off valve 10, the third on-off valve 11 and the fourth on-off valve 12 are all controlled to be open, the throttle valve 21 is throttled normally, and the first subcooling zone 2, the second subcooling zone 4, the first heat exchange zone 1 and the second heat exchange zone 3 are all heated;

[0081] When the operation mode is the upper defrost mode, and when there are both the first one-way throttling device 13 and the second one-way throttling device 14, the first on-off valve 9 is controlled to be closed, the second on-off valve 10 is opened, the third on-off valve 11 is opened, and the fourth on-off valve 12 is closed, the first one-way throttling device 13 is operated, the second one-way throttling device 14 is not operated, the throttling valve 21 is fully opened, the first supercooling zone 2 and the second supercooling zone 4 are both heated, the first heat exchange zone 1 is heated, and the second heat exchange zone 3 is cooled;

[0082] When the operation mode is the lower defrost mode, when there are both the first one-way throttling device 13 and the second one-way throttling device 14, the first on-off valve 9 is controlled to be opened, the second on-off valve 10 is closed, the third on-off valve 11 is closed and the fourth on-off valve 12 is opened, the first one-way throttling device 13 does not operate, the second one-way throttling device 14 operates, the throttling valve 21 is fully opened, the first supercooling zone 2 and the second supercooling zone 4 are both heated, the first heat exchange zone 1 is cooled, and the second heat exchange zone 3 is heated.

[0083] This is the preferred control mode of the air conditioning unit of the utility model. In normal cooling and heating modes, the four on-off valves are all open, the one-way throttling devices are all in a strong throttling state or a non-conducting state, and the throttling valve throttles normally. Figure 4 and Figure 5 The two partitions of the heat exchange device are connected in parallel to exchange heat.

[0084] In the defrosting state, it is divided into upper defrosting mode and lower defrosting mode.

[0085] When defrosting is required, first enter the upper defrost mode, such as Figure 6 At this time, the first on-off valve 9 and the fourth on-off valve 12 are closed, the second on-off valve 10 and the third on-off valve 11 are opened, and the throttle valve is fully opened. The high-temperature and high-pressure gaseous refrigerant flows through the cold section and enters the first heat exchange zone 1 to defrost the first heat exchange zone 1, and then enters the second heat exchange zone 3 for evaporation after throttling by the one-way throttling device. At this time, the first heat exchange zone 1 is in the defrosting state, and the second heat exchange zone 3 is evaporating and absorbing heat, and the heat absorbed by the evaporation provides heating for the room.

[0086] After the upper defrost mode is completed, the lower defrost mode is performed. Figure 7 At this time, the second on-off valve 10 and the third on-off valve 11 are closed, the first on-off valve 9 and the fourth on-off valve 12 are opened, and the throttle valve is fully opened. The high-temperature and high-pressure gaseous refrigerant flows through the cold section and enters the second heat exchange zone 3, defrosts the second heat exchange zone 3, and then enters the first heat exchange zone 1 for evaporation after throttling by the one-way throttling device. At this time, the second heat exchange zone 3 is in the defrosting state, and the first heat exchange zone 1 is evaporating and absorbing heat, and the heat absorbed by the evaporation provides heating for the room.

[0087] The advantage of this utility model is that, in defrost mode, part of the heat absorbed from the outside is used for defrosting, and the other part can continuously provide heat to the room. This is unlike ordinary air conditioners, which need to switch to cooling mode during defrost and cannot provide heat to the room, causing indoor temperature fluctuations.

[0088] As for the problem of whether the defrosting is clean, there are usually two areas where frost is worse. One is the junction of the two heat exchange areas, because the junction is always in contact with the side that has not been defrosted. The other is near the chassis, because there is more condensed water near the chassis and the wind field is poor, the problem of unclean defrosting often occurs. The utility model adopts a distributed subcooling flow path, the first subcooling zone 2 is the junction position, and the second subcooling zone 4 is close to the chassis. Regardless of the upper defrosting mode or the lower defrosting mode, the first subcooling zone 2 and the second subcooling zone 4 are both defrosting, which ensures that the two frosting areas of the unit can be defrosted cleanly.

[0089] The utility model is described by taking a two-way condenser as an example, and can also be used in the design of a three-way, four-way or even more-way condenser (outdoor heat exchange device). As long as the on-off valves corresponding to the number of flow paths are designed, the single-phase throttling device and the supercooling section can achieve the same effect as the two-way condenser.

[0090] The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the utility model should be included in the protection scope of the utility model. The above is only a preferred implementation of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the utility model, and these improvements and variations should also be regarded as the protection scope of the utility model.

Claims

1. A heat exchange device, characterized in that: include: A first heat exchange zone (1), a first subcooling zone (2) and a second heat exchange zone (3), wherein the first subcooling zone (2) is located between the first heat exchange zone (1) and the second heat exchange zone (3); when the first heat exchange zone (1) is defrosted, the first subcooling zone (2) is heated to defrost, and at this time the second heat exchange zone (3) is refrigerated; when the second heat exchange zone (3) is defrosted, the first subcooling zone (2) is heated to defrost, and at this time the first heat exchange zone (1) is refrigerated.

2. The heat exchange device according to claim 1, characterized in that: The invention also comprises a second subcooling zone (4), wherein the second subcooling zone (4) is located on a side of the second heat exchange zone (3) away from the first heat exchange zone (1); when the first heat exchange zone (1) is defrosted, the second subcooling zone (4) is heated to defrost; and when the second heat exchange zone (3) is defrosted, the second subcooling zone (4) is also heated to defrost.

3. The heat exchange device according to claim 2, characterized in that: The first heat exchange zone (1) and the second heat exchange zone (3) are arranged vertically, with the first heat exchange zone (1) being located above the second heat exchange zone (3); the first subcooling zone (2) being located below the first heat exchange zone (1), the second subcooling zone (4) being located below the second heat exchange zone (3), and the first subcooling zone (2) being located above the second heat exchange zone (3).

4. The heat exchange device according to claim 2, characterized in that: The first supercooling zone (2) comprises a first heat exchange pipe section (5), one end of the first heat exchange pipe section (5) is connected to one end of a first pipeline (101), and the other end of the first heat exchange pipe section (5) is connected to one end of a second pipeline (102); the second supercooling zone (4) comprises a second heat exchange pipe section (6), one end of the second heat exchange pipe section (6) is connected to the other end of the first pipeline (101), and the other end of the second heat exchange pipe section (6) is connected to the other end of the second pipeline (102); the first pipeline (101) is also connected to a third pipeline (103), and the second pipeline (102) is also connected to a fourth pipeline (104).

5. The heat exchange device according to claim 4, characterized in that: The first heat exchange zone (1) comprises a third heat exchange pipe segment (7), one end of the third heat exchange pipe segment (7) is connected to one end of the fifth pipeline (105), and the other end of the third heat exchange pipe segment (7) is connected to one end of the sixth pipeline (106); the second heat exchange zone (3) comprises a fourth heat exchange pipe segment (8), one end of the fourth heat exchange pipe segment (8) is connected to the other end of the fifth pipeline (105), and the other end of the fourth heat exchange pipe segment (8) is connected to the other end of the sixth pipeline (106); The fifth pipeline (105) is also connected to a seventh pipeline (107); a first on-off valve (9) is provided on a pipe section of the fifth pipeline (105) between one end of the third heat exchange pipe section (7) and the seventh pipeline (107); and a second on-off valve (10) is provided on a pipe section of the fifth pipeline (105) between one end of the fourth heat exchange pipe section (8) and the seventh pipeline (107); One end of the fourth pipeline (104) is connected to the second pipeline (102), and the other end is connected to the sixth pipeline (106); a third on-off valve (11) is provided on the section of the sixth pipeline (106) between the other end of the third heat exchange pipe section (7) and the fourth pipeline (104); and a fourth on-off valve (12) is provided on the section of the sixth pipeline (106) between the other end of the fourth heat exchange pipe section (8) and the fourth pipeline (104).

6. The heat exchange device according to claim 5, characterized in that: It also includes an eighth pipeline (108) and a ninth pipeline (109), one end of the eighth pipeline (108) being connected to a position on the fifth pipeline (105) and located between the first on-off valve (9) and the third heat exchange pipe section (7), and the other end of the eighth pipeline (108) being connected to a position on the sixth pipeline (106) and located between the fourth on-off valve (12) and the fourth heat exchange pipe section (8); One end of the ninth pipeline (109) is connected to a position on the fifth pipeline (105) and located between the second on-off valve (10) and the fourth heat exchange pipe section (8), and the other end of the ninth pipeline (109) is connected to a position on the sixth pipeline (106) and located between the third on-off valve (11) and the third heat exchange pipe section (7).

7. The heat exchange device according to claim 6, characterized in that: The eighth pipeline (108) is provided with a first one-way throttling device (13), and the first one-way throttling device (13) only allows the fluid to flow from the fifth pipeline (105) to the sixth pipeline (106); the ninth pipeline (109) is provided with a second one-way throttling device (14), and the second one-way throttling device (14) only allows the fluid to flow from the fifth pipeline (105) to the sixth pipeline (106).

8. The heat exchange device according to claim 7, characterized in that: The first one-way throttling device (13) comprises a first one-way valve (15) and a first capillary tube (16), and the second one-way throttling device (14) comprises a second one-way valve (17) and a second capillary tube (18).

9. An air conditioning unit, characterized in that: The heat exchange device (100) comprises any one of claims 5 to 8, and further comprises a compressor (19), an indoor heat exchanger (20) and a throttle valve (21), The indoor heat exchanger (20) further comprises a tenth pipeline (110) and an eleventh pipeline (111); one end of the indoor heat exchanger (20) is connected to the intake end or the exhaust end of the compressor (19) via the tenth pipeline (110); the other end of the indoor heat exchanger (20) is connected to one end of the throttle valve (21) via the eleventh pipeline (111); the other end of the throttle valve (21) is connected to the third pipeline (103); one end of the seventh pipeline (107) is connected to the fifth pipeline (105); and the other end is connected to the exhaust end or the intake end of the compressor (19).

Images