Combined heat exchange device, heat pump unit and hot water equipment

Abstract

The invention relates to a combined heat exchange device, a heat pump unit and hot water equipment, the combined heat exchange device comprises a first heat exchanger and a second heat exchanger, and the first heat exchanger is formed by spirally winding a sleeve; the second heat exchanger is arranged in the inner space surrounded by the first heat exchanger. According to the combined heat exchange device, the sleeve is spirally wound to form the first heat exchanger, and the heat exchange tube pass and the heat exchange area of the first heat exchanger can be increased in a limited installation space. The second heat exchanger is arranged in the inner space surrounded by the first heat exchanger, the inner space of the center area of the first heat exchanger can be fully utilized, waste of the hollow inner space, formed by winding of the sleeve, of the first heat exchanger can be avoided, and when the second heat exchanger and the first heat exchanger have the same function, the second heat exchanger can be recycled in the same volume space. The first heat exchanger and the second heat exchanger are combined to improve the heat exchange capacity of the heat exchange device, and the heat exchange device can be matched with other heat exchangers with good heat exchange performance in heat exchange performance.

Description

Technical Field

[0001] The present application relates to the field of energy conversion technology, and in particular to a combined heat exchange device, a heat pump unit and a hot water device. Background Art

[0002] Since the shell and tube heat exchanger can be applied to a variety of fluids and working conditions, including high temperature, high pressure, corrosive fluid, etc., it has a wide range of application prospects in various heat exchange equipment.

[0003] In order to increase the tube length and heat exchange area of ​​the shell-and-tube heat exchanger within a limited installation space, the shell of the shell-and-tube heat exchanger is often wound into a spiral tube. However, this will also result in a hollow internal space in the middle of the shell-and-tube heat exchanger. If this part of the internal space cannot be utilized, it will lead to space waste in the central area of ​​the shell-and-tube heat exchanger.

[0004] In addition, when other heat exchangers with better heat exchange performance (such as fin heat exchangers, etc.) are used in the refrigerant circulation system (such as heat pump units, air-conditioning units, etc.) to cooperate with the shell and tube heat exchanger to realize refrigerant circulation, due to the low heat exchange performance of the shell and tube heat exchanger, it is impossible to match the heat exchange performance with other heat exchangers (such as fin heat exchangers, etc.), which will cause the whole machine to fail to perform effectively. Summary of the invention

[0005] The present application provides a combined heat exchange device, a heat pump unit and a hot water device to solve the technical problems of space waste and limited heat exchange performance when using a shell-and-tube heat exchanger for heat exchange in the prior art.

[0006] In a first aspect, the present application provides a combined heat exchange device, comprising:

[0007] The first heat exchanger is formed by spirally winding a casing;

[0008] The second heat exchanger is arranged in the inner space surrounded by the first heat exchanger.

[0009] Optionally, the first heat exchanger and the second heat exchanger are connected in series via a first connecting pipe, so as to allow the first fluid to flow from the first heat exchanger to the second heat exchanger;

[0010] The first heat exchanger and the second heat exchanger are connected in series via a second connecting pipe, so as to allow the second fluid to flow from the second heat exchanger to the first heat exchanger;

[0011] The first fluid and the second fluid exchange heat in the first heat exchanger and the second heat exchanger.

[0012] Optionally, both ends of the first connecting pipe are detachably connected to the first heat exchanger and the second heat exchanger respectively;

[0013] Both ends of the second connecting pipe are detachably connected to the first heat exchanger and the second heat exchanger respectively.

[0014] Optionally, a first inlet and a second outlet are provided at the first end of the sleeve, and a second inlet and a first outlet are provided at the second end of the sleeve, the first inlet is connected to the first outlet through a first channel inside the sleeve, and the second inlet is connected to the second outlet through a second channel inside the sleeve, and the fluid flow direction in the first channel is opposite to the fluid flow direction in the second channel.

[0015] Optionally, the sleeve includes an inner tube and an outer tube which are coaxially arranged, one of the first channel and the second channel is formed inside the inner tube, and the other is formed between an outer wall of the inner tube and an inner wall of the outer tube.

[0016] Optionally, the second heat exchanger includes a cylinder and a heat exchange tube, the cylinder has a cavity for accommodating a fluid, and the heat exchange tube is arranged in contact with a wall surface of the cylinder.

[0017] Optionally, a third inlet and a third outlet are provided on the cylinder, the heat exchange tube is arranged inside the cylinder, and the heat exchange tube has a fourth inlet and a fourth outlet extending out of the cylinder.

[0018] Optionally, the outer surface of the cylinder is in contact with the sleeve, and the cylinder is made of a heat-conducting material.

[0019] Optionally, there is a preset distance between the outer surface of the cylinder and the sleeve, and the material of the cylinder is a heat-insulating material.

[0020] Optionally, exhaust valves are provided at the tops of the first heat exchanger and the second heat exchanger.

[0021] Optionally, drain valves are provided at the bottoms of the first heat exchanger and the second heat exchanger.

[0022] In a second aspect, the present application provides a heat pump unit, comprising the combined heat exchange device provided in the first aspect of the present application, and further comprising a fixing component, wherein the fixing component is respectively connected to the first heat exchanger and the second heat exchanger.

[0023] In a third aspect, the present application provides a water heating device, including the combined heat exchange device provided in the first aspect of the present application;

[0024] Alternatively, it includes the heat pump unit provided in the second aspect of the embodiment of the present application.

[0025] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0026] The combined heat exchange device provided in the embodiment of the present application includes a first heat exchanger and a second heat exchanger, wherein the first heat exchanger is formed by spirally winding a sleeve, and the heat exchange pipe and heat exchange area of ​​the first heat exchanger can be increased within a limited installation space. The second heat exchanger is arranged in the internal space surrounded by the first heat exchanger, and the internal space of the central area of ​​the first heat exchanger can be fully utilized, and the waste of the hollow internal space formed by the sleeve winding of the first heat exchanger can be avoided. When the second heat exchanger has the same function as the first heat exchanger, the heat exchange capacity of the whole machine can be improved by combining the first heat exchanger and the second heat exchanger in the same volume space, and the heat exchange performance can be matched with other heat exchangers with better heat exchange performance (such as finned heat exchangers), so that the performance of the whole machine can be effectively exerted, thereby improving the competitiveness of heat exchange products (such as heat pump units, air conditioning units or hot water equipment, etc.).

[0027] The heat pump unit and hot water equipment provided in the embodiment of the present application include the above-mentioned combined heat exchange device, which can arrange the second heat exchanger in the internal space of the first heat exchanger, which is conducive to the compact arrangement of the heat exchange device while improving the heat exchange performance. Therefore, it naturally has the technical effect of the above-mentioned combined heat exchange device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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.

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0030] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0031] Figure 1 A schematic diagram of the structure of the combined heat exchange device provided in the embodiment of the present application Figure 1 ;

[0032] Figure 2 A schematic diagram of the structure of the combined heat exchange device provided in the embodiment of the present application Figure 2 ;

[0033] Figure 3 A schematic diagram of the structure of a first heat exchanger and a first bracket provided in an embodiment of the present application;

[0034] Figure 4 Provided for the embodiments of this application Figure 3 A top view of

[0035] Figure 5 The embodiment of the present application provides Figure 4 Partial cross-section of the middle AA;

[0036] Figure 6 A schematic diagram of the structure of the second heat exchanger and the second bracket provided in an embodiment of the present application;

[0037] Figure 7 A schematic diagram of the structure of the second heat exchanger and the second bracket after the cylinder is removed provided in an embodiment of the present application;

[0038] Figure 8 A partial cross-sectional view of a second heat exchanger provided in an embodiment of the present application;

[0039] Fig. 9 A connection diagram of a heat pump unit provided in an embodiment of the present application;

[0040] Fig.10 A schematic diagram of the partial structure of a water heating device provided in an embodiment of the present application.

[0041] Description of reference numerals:

[0042] 1. first heat exchanger; 11. casing; 111. inner tube; 112. outer tube; 12. first inlet; 13. second outlet; 14. second inlet; 15. first outlet; 16. first exhaust valve; 17. first drain valve; 18. first temperature detection element;

[0043] 2. Second heat exchanger; 21. Cylinder; 211. Third inlet; 212. Third outlet; 213. Cylinder body; 22. Heat exchange tube; 221. Fourth inlet; 222. Fourth outlet; 223. Spiral tube section; 23. Second exhaust valve; 24. Second drain valve; 25. Second temperature detection element;

[0044] 3. First connecting pipe;

[0045] 4. Second connecting pipe;

[0046] 5. Fixing assembly; 51. First bracket; 511. Bracket body 1; 512. First fixing hole; 513. Connector; 52. Second bracket; 521. Bracket body 2; 522. Second fixing hole;

[0047] 6. Compressor;

[0048] 7. The third heat exchanger;

[0049] 8. Chassis components;

[0050] 9. Partition assembly. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0052] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0053] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0054] In order to solve the technical problems of space waste and limited heat exchange performance when using a shell and tube heat exchanger for heat exchange in the prior art, the present application provides a combined heat exchange device, a heat pump unit and a hot water device. The combined heat exchange device arranges the second heat exchanger 2 in the internal space of the first heat exchanger 1 (i.e., the shell and tube heat exchanger), which can fully utilize the internal space of the central area of ​​the first heat exchanger 1 and avoid wasting installation space; at the same time, when the first heat exchanger 1 and the second heat exchanger 2 have the same function, the combination of the two can be used to match the heat exchange performance with other heat exchangers with better heat exchange performance (such as fin heat exchangers, etc.), which is conducive to fully and effectively exerting the heat exchange performance of the whole machine.

[0055] See also Figures 1 to 10 In a first aspect, the embodiment of the present application provides a combined heat exchange device, including a first heat exchanger 1 and a second heat exchanger 2. The first heat exchanger 1 is formed by spirally winding a sleeve 11, which can improve the heat exchange tube and heat exchange area of ​​the first heat exchanger 1 within a limited installation space. The second heat exchanger 2 is arranged in the internal space surrounded by the first heat exchanger 1, which can make full use of the internal space in the central area of ​​the first heat exchanger 1, and can avoid the waste of the hollow internal space of the first heat exchanger 1 formed by winding the sleeve 11. When the second heat exchanger 2 has the same function as the first heat exchanger 1, the heat exchange capacity of the whole machine can be improved by combining the first heat exchanger 1 and the second heat exchanger 2 in the same volume space, and the heat exchange performance can be matched with other heat exchangers with better heat exchange performance (such as finned heat exchangers), so that the performance of the whole machine can be effectively exerted, thereby improving the competitiveness of heat exchange products (such as heat pump units, air conditioning units or hot water equipment, etc.).

[0056] It should be noted that the size and shape of the second heat exchanger 2 match the internal space of the central area of ​​the first heat exchanger 1, so that the combined heat exchange device has a compact product structure. The heat exchange capacity (condensation heat release capacity or evaporation heat absorption capacity) of the first heat exchanger 1 and the second heat exchanger 2 can be superimposed to improve the overall heat exchange capacity of the combined heat exchange device. Alternatively, under the same heating capacity conditions, through this combined heat exchange device, a smaller shell and tube heat exchanger (i.e., the first heat exchanger 1) size can be achieved, reducing the space occupied by the combined heat exchange device as a whole inside the unit, which is conducive to realizing the small-sized structural design of the unit.

[0057] In the above embodiments, the first heat exchanger 1 and the second heat exchanger 2 have the same function, and the refrigerant can be evaporated in both the first heat exchanger 1 and the second heat exchanger 2, or the refrigerant can be condensed in both the first heat exchanger 1 and the second heat exchanger 2, which is conducive to achieving sufficient evaporation or sufficient condensation of the refrigerant. The specific functions of the combined heat exchange device can be set as needed and are not limited here.

[0058] In some embodiments of this application, please refer to Figure 1 , Figure 2 and Fig. 9 The first heat exchanger 1 and the second heat exchanger 2 are connected in series through a first connecting pipe 3, which is used to make the first fluid flow from the first heat exchanger 1 to the second heat exchanger 2; the first heat exchanger 1 and the second heat exchanger 2 are connected in series through a second connecting pipe 4, which is used to make the second fluid flow from the second heat exchanger 2 to the first heat exchanger 1; the first fluid and the second fluid exchange heat in the first heat exchanger 1 and the second heat exchanger 2, which can realize countercurrent heat exchange between the first fluid and the second fluid in the first heat exchanger 1 and the second heat exchanger 2, thereby realizing optimized heat exchange of the combined heat exchange device.

[0059] In the above embodiments, the first fluid and the second fluid can be substances (i.e., refrigerants) that can realize heat exchange, such as refrigerants, water, and oil. The types of the first fluid and the second fluid can be the same or different, and both can realize countercurrent heat exchange in two heat exchangers through a combined heat exchange device. This heat exchange method can make the cold fluid and the hot fluid flow in opposite directions, so that the cold fluid can absorb more heat when flowing out of the combined heat exchange device, and the hot fluid can release more heat when flowing out of the combined heat exchange device, so that the temperature difference between the cold and hot fluids can always be kept large, thereby improving the heat exchange efficiency of the combined heat exchange device.

[0060] In some embodiments of this application, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 6 , the two ends of the first connecting pipe 3 are detachably connected to the first heat exchanger 1 and the second heat exchanger 2 respectively; the two ends of the second connecting pipe 4 are detachably connected to the first heat exchanger 1 and the second heat exchanger 2 respectively. Since the second heat exchanger 2 is embedded in the internal space at the center of the first heat exchanger 1, it is easy for the pipes to be intertwined. The first connecting pipe 3 and the second connecting pipe 4 are both detachably connected to the first heat exchanger 1 and the second heat exchanger 2. The second heat exchanger 2 can be embedded in the middle of the first heat exchanger 1, and then the first connecting pipe 3 and the second connecting pipe 4 are assembled. The interference between the heat exchangers (i.e., the first heat exchanger 1 and the second heat exchanger 2) and the connecting pipes (i.e., the first connecting pipe 3 and the second connecting pipe 4) can be avoided, and the difficulty of connecting the pipes between the first heat exchanger 1 and the second heat exchanger 2 can be reduced, which is beneficial to improving the assembly efficiency of the combined heat exchange device.

[0061] In the above embodiment, the shapes and lengths of the first connecting pipe 3 and the second connecting pipe 4 are determined according to the layout requirements of the first heat exchanger 1 and the second heat exchanger 2, and are not limited here.

[0062] In some embodiments of this application, please refer to Figure 1 , Figure 2, Figure 3 , Figure 4 and Figure 5 The first end of the sleeve 11 is provided with a first inlet 12 and a second outlet 13, and the second end of the sleeve 11 is provided with a second inlet 14 and a first outlet 15. The first inlet 12 and the first outlet 15 are communicated through a first channel inside the sleeve 11, which can be used to realize the flow of the first fluid inside the sleeve 11, so that the first fluid flows from the first end to the second end of the sleeve 11. The second inlet 14 and the second outlet 13 are communicated through a second channel inside the sleeve 11, which can be used to realize the flow of the second fluid inside the sleeve 11, so that the second fluid flows from the second end to the first end of the sleeve 11. The flow direction of the fluid in the first channel is opposite to the flow direction of the fluid in the second channel, so that the first fluid and the second fluid can realize countercurrent heat exchange in the length direction of the sleeve 11, which is conducive to realizing efficient heat exchange between the first fluid and the second fluid in the first heat exchanger 1.

[0063] In some embodiments of this application, please refer to Figure 4 and Figure 5 The sleeve 11 includes an inner tube 111 and an outer tube 112 which are coaxially arranged. One of the first channel and the second channel is formed inside the inner tube 111, and the other is formed between the outer wall of the inner tube 111 and the inner wall of the outer tube 112, so that the fluid in the first channel and the fluid in the second channel can achieve heat exchange through the tube wall of the inner tube 111.

[0064] In some embodiments of this application, please refer to Figures 1 to 5 The first inlet 12 and the first outlet 15 are both connected to the tube wall of the outer tube 112 in the sleeve 11, so that the first channel is formed between the outer wall of the inner tube 111 and the inner wall of the outer tube 112. The second inlet 14 and the second outlet 13 are both connected to the inner tube 111 in the sleeve 11, so that the second channel is formed inside the inner tube 111.

[0065] In some embodiments of this application, please refer to Figure 1 , Figure 2 , Figure 6 and Figure 7 The second heat exchanger 2 includes a cylinder 21 and a heat exchange tube 22. The cylinder 21 has a cavity for accommodating a fluid. The heat exchange tube 22 is arranged in contact with the wall of the cylinder 21, so that heat transfer between the cylinder 21 and the heat exchange tube 22 can be achieved, thereby achieving heat exchange between the fluid inside the cylinder 21 and the fluid inside the heat exchange tube 22.

[0066] It should be noted that the barrel 21 of the present application is arranged in contact with the heat exchange tube 22, which can make the structure of the second heat exchanger 2 compact and avoid the situation where there is space waste in the second heat exchanger 2. The heat exchange tube 22 can be arranged outside the barrel 21 or inside the barrel 21, and the purpose of the present application can be achieved.

[0067] In some embodiments of this application, please refer to Figure 1 , Figure 2 , Figure 6 , Figure 7 and Figure 8 The barrel 21 is provided with a third inlet 211 and a third outlet 212, which can be used to realize the input and output of the fluid inside the barrel 21. The heat exchange tube 22 is arranged inside the barrel 21, so that the tube wall of the heat exchange tube 22 can fully contact the fluid inside the barrel 21, thereby realizing efficient heat exchange between the fluid inside the heat exchange tube 22 and the fluid inside the barrel 21. The heat exchange tube 22 has a fourth inlet 221 and a fourth outlet 222 extending out of the barrel 21, which can realize the input and output of the fluid inside the heat exchange tube 22. One of the first fluid and the second fluid flows inside the barrel 21, and the other flows inside the heat exchange tube 22. The first fluid and the second fluid can realize heat exchange inside the barrel 21 through the tube wall of the heat exchange tube 22.

[0068] It should be noted that when the heat exchange tube 22 is disposed inside the cylinder 21 , heat loss caused by contact between the heat exchange tube 22 and the air outside the cylinder 21 can be avoided, thereby ensuring the heat exchange efficiency of the second heat exchanger 2 .

[0069] In the above embodiment, the number of heat exchange tubes 22 can be one or more, and all can realize the heat exchange function with the fluid inside the barrel 21, but when the number of heat exchange tubes 22 is multiple, the connection process between the heat exchange tube 22 and the barrel 21 will be complicated. In order to ensure the heat exchange tube length and heat exchange area of ​​the heat exchange tube 22, it is preferred to wind a single heat exchange tube 22 in a spiral shape, so that the heat exchange tube 22 has a spiral tube section 223, and a dense heat exchange area is set on the inner wall of the barrel 21, and the number of heat exchange tubes 22 assembled inside the barrel 21 can also be reduced.

[0070] In some embodiments of this application, please refer to Figure 6 , Figure 7 and Figure 8 The third inlet 211 and the third outlet 212 are both connected to the wall of the cylinder body 213. Fluid can be input into the interior of the cylinder body 21 through the third inlet 211. The fluid inside the cylinder body 21 can be output through the third outlet 212 after passing through the wall gap of the spiral tube section 223, thereby realizing the input and output of the fluid inside the cylinder body 21.

[0071] In some embodiments of this application, please refer to Figures 1 to 8The first outlet 15 on the first heat exchanger 1 is connected to the fourth inlet 221 of the second heat exchanger 2 through the first connecting pipe 3, so that after the first fluid enters from the first inlet 12 of the first heat exchanger 1, it flows along the first channel formed between the outer wall of the inner tube 111 and the inner wall of the outer tube 112 to the first outlet 15, and then flows into the fourth inlet 221 of the heat exchange tube 22 through the first connecting pipe 3, flows along the spiral tube section 223 of the heat exchange tube 22, and finally outputs from the fourth outlet 222 of the heat exchange tube 22.

[0072] In some embodiments of this application, please refer to Figures 1 to 8 The third outlet 212 on the second heat exchanger 2 is connected to the second inlet 14 of the first heat exchanger 1 through the second connecting pipe 4, so that the second fluid enters the interior of the cylinder 21 from the third inlet 211 of the second heat exchanger 2, and then enters the second connecting pipe 4 through the third outlet 212 on the cylinder 21, and then enters the inner tube 111 of the sleeve 11 from the second inlet 14, and finally flows out from the second outlet 13 connected to the inner tube 111.

[0073] In some embodiments of this application, please refer to Figure 1 and Figure 2 The first outlet 15 is arranged at the bottom of the sleeve 11, and the fourth inlet 221 is arranged at the top of the cylinder 21. In order to realize the connection between the two, the first outlet 15 extends upward to the internal space of the sleeve 11. The first connecting pipe 3 is an inverted U-shaped pipe, which can realize the connection between the first outlet 15 and the fourth inlet 221.

[0074] In some embodiments of this application, please refer to Figure 1 and Figure 2 The second inlet 14 is arranged at the bottom of the sleeve 11, and the third outlet 212 is arranged on one side of the cylinder 21. In order to realize the connection between them, the second inlet 14 extends upward to the outside of the sleeve 11, and the second connecting pipe 4 is a 7-shaped pipe, which can realize the connection between the third outlet 212 and the second inlet 14.

[0075] In some embodiments of the present application, the outer surface of the cylinder 21 is in contact with the sleeve 11, and the material of the cylinder 21 is a heat-conducting material, which can achieve heat conduction between the first heat exchanger 1 and the second heat exchanger 2, and can reduce the heat loss of the first heat exchanger 1 and the second heat exchanger 2. Since the first heat exchanger 1 and the second heat exchanger 2 have the same function, the contact setting between the two will not have an adverse effect on their respective heat exchange efficiency.

[0076] In other embodiments of the present application, there is a preset distance between the outer surface of the cylinder 21 and the sleeve 11, so that there is a small assembly gap (1-10mm) between the two, which can reduce the difficulty of assembling the second heat exchanger 2 embedded in the first heat exchanger 1. The material of the cylinder 21 is a thermal insulation material, which can prevent the heat in the second heat exchanger 2 from dissipating into the internal space at the center of the first heat exchanger 1, and can reduce the energy loss of the second heat exchanger 2.

[0077] In some embodiments of this application, please refer to Figure 1 , Figure 2 and Figure 3 The tops of the first heat exchanger 1 and the second heat exchanger 2 are both provided with exhaust valves, which can discharge the air inside the first heat exchanger 1 and the second heat exchanger 2 to prevent the occurrence of air blockage, thereby ensuring the normal operation of the first heat exchanger 1 and the second heat exchanger 2.

[0078] In some embodiments of this application, please refer to Figure 1 , Figure 2 and Figure 3 The first heat exchanger 1 is provided with a first exhaust valve 16, which is connected to the second outlet 13 at the top of the sleeve 11 and can be used to exhaust the air accumulated at the top of the inner tube 111, thereby ensuring that the second fluid can flow smoothly in the inner tube 111, thereby improving the heat exchange efficiency between the first fluid and the second fluid inside the sleeve 11.

[0079] In some embodiments of this application, please refer to Figure 1 and Figure 2 In order to discharge the air accumulated inside the cylinder 21 of the second heat exchanger 2, the second exhaust valve 23 of the second heat exchanger 2 can be set on the third outlet 212 located at the upper part of the second heat exchanger 2 or on the second connecting pipe 4 connected to the third outlet 212, both of which can achieve the purpose of the present application, so that the second fluid can flow out smoothly from the inside of the cylinder 21, thereby improving the flow smoothness of the second fluid inside the cylinder 21, thereby improving the heat exchange efficiency between the first fluid and the second fluid inside the cylinder 21.

[0080] In some embodiments of this application, please refer to Figure 1 and Figure 3 The first heat exchanger 1 and the second heat exchanger 2 are both provided with drain valves at the bottom, which can realize the discharge of the accumulated liquid and impurities at the bottom of the first heat exchanger 1 and the second heat exchanger 2, which is beneficial to the sewage discharge of the first heat exchanger 1 and the second heat exchanger 2, and avoids the presence of accumulated liquid and impurities affecting the heat transfer efficiency and service life of the first heat exchanger 1 and the second heat exchanger 2.

[0081] In some embodiments of this application, please refer to Figure 1 and Figure 3The first drain valve 17 disposed at the bottom of the first heat exchanger 1 is connected to the second inlet 14 at the bottom of the casing 11, so that the accumulated liquid and impurities at the bottom of the casing 11 can be discharged.

[0082] In some embodiments of this application, please refer to Figure 1 and Figure 2 The second liquid discharge valve 24 disposed at the bottom of the second heat exchanger 2 is communicated with the third inlet 211 disposed at the bottom of the cylinder 21 , so that the accumulated liquid and impurities at the bottom of the cylinder 21 can be discharged.

[0083] When the combined heat exchange device is set in a low-temperature environment, if the combined heat exchange device is powered off or stops running, the temperature inside the first heat exchanger 1 and the second heat exchanger 2 will drop, which may cause the water in the pipeline to freeze, so that there is a risk of freezing inside the first heat exchanger 1 and the second heat exchanger 2. Through the first exhaust valve 16 and the second exhaust valve 23, the air in the first heat exchanger 1 and the second heat exchanger 2 can be discharged, which is conducive to reducing the pressure of the sleeve 11 and the cylinder 21, thereby reducing the possibility of water freezing, and can prevent the freezing cracking of the pipeline and the cylinder 21 due to the freezing of internal water to a certain extent. Through the first drain valve 17 and the second drain valve 24, the accumulated liquid in the pipeline or the cylinder 21 can be drained. After draining the accumulated liquid, the possibility of freezing of water inside the pipeline and the cylinder 21 can be greatly reduced, thereby preventing freezing damage to the pipeline and the cylinder 21 and damage to the device caused by freezing.

[0084] It should be noted that the combined heat exchange device in the present application can be applied to any equipment that needs to achieve heat exchange, such as heat pump units, air-conditioning units, etc., and can achieve reasonable utilization of installation space and a significant improvement in heat exchange capacity.

[0085] See also Figures 1 to 10 The second aspect of the embodiment of the present application provides a heat pump unit, including the combined heat exchange device described in the above embodiment, and also includes a fixing component 5, which is respectively connected to the first heat exchanger 1 and the second heat exchanger 2, and can be used to realize the fixed setting of the first heat exchanger 1 and the second heat exchanger 2 in the heat pump unit.

[0086] In some embodiments of this application, please refer to Figure 2 , Figure 3 , Figure 4 , Figure 6 , Fig. 9 and Fig.10The fixing assembly 5 includes a first bracket 51 and a second bracket 52, wherein the first bracket 51 is used to connect with the first heat exchanger 1, and the second bracket 52 is used to connect with the second heat exchanger 2. The second bracket 52 can be firstly set on the first bracket 51 to connect the first heat exchanger 1 and the second heat exchanger 2 into a whole, and then connected with other components in the heat pump unit (such as the chassis assembly 8, etc.) through the first bracket 51 or the second bracket 52, so as to realize the fixed setting of the combined heat exchange device in the heat pump unit.

[0087] In some embodiments of this application, please refer to Figure 3 and Figure 4 The first bracket 51 includes a bracket body 511, a first fixing hole 512 and a connecting piece 513. The connecting piece 513 is used to realize a detachable connection between the bracket body 511 and the second bracket 52. The first fixing hole 512 is used to realize a connection between the bracket body 511 and the chassis assembly 8, so that the connection between the combined heat exchange device and the chassis assembly 8 can be realized through the first bracket 51.

[0088] In some embodiments of this application, please refer to Figure 4 The first fixing hole 512 is a strip hole, which can realize the adjustment of the installation position of the bracket body 511 on the chassis assembly 8, so that the combined heat exchange device is located at a suitable position in the heat pump unit.

[0089] In some embodiments of this application, please refer to Figure 6 and Figure 7 The second bracket 52 includes two symmetrically arranged bracket bodies 521. The two bracket bodies 521 are connected to both sides of the cylinder 21 to achieve vertical support for the cylinder 21. The bracket bodies 521 are provided with second fixing holes 522, which can be used to connect with the connecting piece 513 on the first bracket 51.

[0090] In some embodiments of this application, please refer to Figure 7 and Fig.10 The heat pump unit also includes a compressor 6 and a third heat exchanger 7. The function of the third heat exchanger 7 is different from that of the first heat exchanger 1 and the second heat exchanger 2, and can allow the refrigerant to achieve physical changes of evaporation heat absorption and condensation heat release in the heat pump unit. Specifically, when the refrigerant evaporates and absorbs heat in the third heat exchanger 7, the refrigerant condenses and releases heat in the first heat exchanger 1 and the second heat exchanger 2. When the refrigerant condenses and releases heat in the third heat exchanger 7, the refrigerant evaporates and absorbs heat in the first heat exchanger 1 and the second heat exchanger 2.

[0091] It should be noted that the third heat exchanger 7 can be a heat exchanger with good heat exchange performance such as a finned heat exchanger. By connecting the first heat exchanger 1 and the second heat exchanger 2 in series, the heat exchange performance matching with the third heat exchanger 7 can be achieved. A second heat exchanger 2 is placed in the internal cavity of the shell and tube heat exchanger (i.e., the first heat exchanger 1) for combination, thereby improving the heat exchange capacity of the heat pump unit, and making the combined heat exchange device installed in a limited structural space have the same heat exchange performance as the finned heat exchanger, which can better exert the performance of the heat exchanger, is conducive to fully realizing the energy efficiency of the heat pump unit and improving product competitiveness.

[0092] In some embodiments of the present application, the first fluid is a hot fluid, and the second fluid is a cold fluid. The first heat exchanger 1 and the second heat exchanger 2 have the same function, and are both used to achieve the heating of the second fluid. At this time, the first fluid condenses and releases heat in the first heat exchanger 1 and the second heat exchanger 2, and the heat can be transferred to the second fluid to achieve heating of the second fluid.

[0093] In some embodiments of this application, please refer to Fig. 9 When the first fluid is the refrigerant circulating in the heat pump unit, the third heat exchanger 7 is the evaporator of the heat pump unit, which can realize the evaporation heat absorption of the first fluid so as to continuously input the high-temperature first fluid into the combined heat exchange device.

[0094] Specifically, after the first fluid is discharged from the compressor 6, it enters the first heat exchanger 1 and the second heat exchanger 2 in sequence to condense and release heat, and the second fluid flows into the second heat exchanger 2 and the first heat exchanger 1 in sequence to perform countercurrent heat exchange with the first fluid, absorb the heat transferred by the first fluid, and achieve the temperature increase of the second fluid. The first fluid flows from the high temperature side to the low temperature side of the combined heat exchange device, and the second fluid flows from the low temperature side to the high temperature side of the combined heat exchange device, which is conducive to achieving efficient heat exchange between the first fluid and the second fluid in the combined heat exchange device.

[0095] In some embodiments of this application, please refer to Fig.10 The heat pump unit also includes a partition assembly 9 arranged on the chassis assembly 8, which can be used to separate the installation space of the combined heat exchange device in the heat pump unit, which is conducive to the zoning arrangement of various components in the heat pump unit, avoiding mutual interference or mutual influence between the combined heat exchange device and other components in the heat pump unit. It is suitable for side-outlet heat pump units, and the partition assembly 9 can be used to separate the installation space matching the combined heat exchange device.

[0096] See also Figures 1 to 10In a third aspect, the embodiment of the present application provides a water heater, including the combined heat exchange device described in the above embodiment; in this case, the first fluid is a refrigerant, and the second fluid is water, and the water can be heated by the first heat exchanger 1 and the second heat exchanger 2. By combining the two heat exchangers, the heat exchange performance of the whole machine can be further improved within the same volume space, and the heating efficiency of the water heater can be improved. Alternatively, a compact combined heat exchange device is used to facilitate the miniaturization of the water heater.

[0097] In some embodiments of the present application, the hot water equipment includes the heat pump unit described in the above embodiments. The heat pump unit uses the heat energy of the refrigerant (i.e., the first fluid) to heat water (i.e., the second fluid), and does not need to consume a large amount of electricity or gas. The use of the heat pump unit can replace traditional coal, oil, boilers and other equipment, improve heating efficiency, and reduce operating costs. This makes the hot water equipment of the present application not only suitable for household hot water supply, but also suitable for commercial places such as factories, schools, and hospitals.

[0098] In some embodiments of this application, please refer to Figure 1 and Figure 2 The first exhaust valve 16 and the second exhaust valve 23 are arranged at the high point of the water outlet pipes of the first heat exchanger 1 and the second heat exchanger 2, and can be used to discharge the gas accumulated on the top of the water outlet pipes. The first drain valve 17 and the second drain valve 24 are arranged at the low point of the water inlet pipes of the first heat exchanger 1 and the second heat exchanger 2, which can facilitate the emptying of accumulated liquid and impurities, and is beneficial to realize the sewage discharge and power-off antifreeze function of the hot water equipment.

[0099] In some embodiments of the present application, in order to detect the water temperature, a second temperature detection element 25 is provided at the third inlet 211 of the second heat exchanger 2 for measuring the initial temperature of the second fluid (i.e., water), and a first temperature detection element 18 is provided at the second outlet 13 of the first heat exchanger 1 for measuring the output temperature of the second fluid. According to the detection information of the first temperature detection element 18 and the second temperature detection element 25, the heating parameters can be adjusted, which is conducive to realizing intelligent temperature control adjustment of the hot water equipment.

[0100] See also Figures 1 to 10 In some embodiments of the present application, the working process of the above-mentioned water heating device is as follows:

[0101] Step 1: compressing the first fluid (i.e., refrigerant) by means of the compressor 6 to make the first fluid into a high-temperature and high-pressure gas;

[0102] Step 2: The high-temperature and high-pressure first fluid enters the first channel of the casing 11 through the first inlet 12, and then flows to the first outlet 15 of the casing 11 through the first channel; then enters the heat exchange tube 22 of the second heat exchanger 2 through the first connecting pipe 3, and flows through the fourth inlet 221, the spiral pipe section 223 and the fourth outlet 222 in sequence, and realizes secondary condensation in the first heat exchanger 1 and the second heat exchanger 2, so that the first fluid becomes a high-pressure and low-temperature liquid;

[0103] At the same time, the low-temperature second fluid (i.e., water) enters the interior of the cylinder 21 through the third inlet 211 at the bottom of the cylinder 21, exchanges heat with the first fluid inside the heat exchange tube 22, and then enters the second connecting pipe 4 through the third outlet 212 at the top of the cylinder 21, enters the second inlet 14 at the bottom of the sleeve 11 through the second connecting pipe 4, flows in the inner tube 111 of the sleeve 11, and exchanges heat with the first fluid outside the inner tube 111, and finally outputs high-temperature hot water through the second outlet 13 at the top of the sleeve 11.

[0104] Step three: The first fluid flowing out from the fourth outlet 222 of the heat exchange tube 22 flows through the refrigerant circulation pipeline to the third heat exchanger 7, evaporates and absorbs heat in the third heat exchanger 7, and becomes a low-temperature and low-pressure saturated gas form, and returns to the compressor 6 again to facilitate the next refrigerant cycle.

[0105] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments 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 "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence 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 interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0106] 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, 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.

[0107] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A combined heat exchange device, characterized in that: include: A first heat exchanger (1), wherein the first heat exchanger (1) is formed by spirally winding a casing (11); A second heat exchanger (2), wherein the second heat exchanger (2) is arranged in an internal space surrounded by the first heat exchanger (1).

2. The combined heat exchange device according to claim 1, characterized in that: The first heat exchanger (1) and the second heat exchanger (2) are connected in series via a first connecting pipe (3) for allowing the first fluid to flow from the first heat exchanger (1) to the second heat exchanger (2); The first heat exchanger (1) and the second heat exchanger (2) are connected in series via a second connecting pipe (4) for allowing the second fluid to flow from the second heat exchanger (2) to the first heat exchanger (1); The first fluid and the second fluid exchange heat in the first heat exchanger (1) and the second heat exchanger (2).

3. The combined heat exchange device according to claim 2, characterized in that: Both ends of the first connecting pipe (3) are detachably connected to the first heat exchanger (1) and the second heat exchanger (2); Both ends of the second connecting pipe (4) are detachably connected to the first heat exchanger (1) and the second heat exchanger (2) respectively.

4. The combined heat exchange device according to any one of claims 1 to 3, characterized in that: The first end of the sleeve (11) is provided with a first inlet (12) and a second outlet (13), and the second end of the sleeve (11) is provided with a second inlet (14) and a first outlet (15); the first inlet (12) and the first outlet (15) are communicated through a first channel inside the sleeve (11); the second inlet (14) and the second outlet (13) are communicated through a second channel inside the sleeve (11); and the flow direction of the fluid in the first channel is opposite to the flow direction of the fluid in the second channel.

5. The combined heat exchange device according to claim 4, characterized in that: The sleeve (11) comprises an inner tube (111) and an outer tube (112) which are coaxially arranged, one of the first channel and the second channel is formed inside the inner tube (111), and the other is formed between the outer wall of the inner tube (111) and the inner wall of the outer tube (112).

6. The combined heat exchange device according to any one of claims 1 to 3, characterized in that: The second heat exchanger (2) comprises a cylinder (21) and a heat exchange tube (22); the cylinder (21) has a cavity for accommodating a fluid; and the heat exchange tube (22) is arranged in contact with a wall surface of the cylinder (21).

7. The combined heat exchange device according to claim 6, characterized in that: The cylinder (21) is provided with a third inlet (211) and a third outlet (212); the heat exchange tube (22) is arranged inside the cylinder (21); and the heat exchange tube (22) has a fourth inlet (221) and a fourth outlet (222) extending out of the cylinder (21).

8. The combined heat exchange device according to claim 6, characterized in that: The outer surface of the cylinder (21) is arranged in contact with the sleeve (11), and the material of the cylinder (21) is a heat-conducting material.

9. The combined heat exchange device according to claim 6, characterized in that: There is a preset distance between the outer surface of the cylinder (21) and the sleeve (11), and the cylinder (21) is made of a heat-insulating material.

10. The combined heat exchange device according to any one of claims 1 to 3, characterized in that: The tops of the first heat exchanger (1) and the second heat exchanger (2) are both provided with exhaust valves.

11. The combined heat exchange device according to any one of claims 1 to 3, characterized in that: The bottoms of the first heat exchanger (1) and the second heat exchanger (2) are both provided with drain valves.

12. A heat pump unit, characterized in that: It comprises the combined heat exchange device according to any one of claims 1 to 11, and further comprises a fixing component (5), wherein the fixing component (5) is respectively connected to the first heat exchanger (1) and the second heat exchanger (2).

13. A water heating device, characterized in that: Comprising the combined heat exchange device according to any one of claims 1 to 11; Alternatively, it comprises the heat pump unit as claimed in claim 12.

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