Heat exchange system and gas water heater

Abstract

This utility model relates to the field of gas water heater technology, and discloses a heat exchange system and a gas water heater. The heat exchange system includes: a combustion chamber body, including an inlet wall and a return wall arranged opposite each other. The inlet wall has an inlet interface and an inlet chamber, and the return wall has a return chamber. One of the inlet wall and the return wall has an outlet interface; multiple water-cooled pipes are provided, located on at least one side of the combustion chamber body, with one end of the water-cooled pipe connected to the inlet chamber and the other end connected to the return chamber; and a heat exchanger assembly is located inside the combustion chamber body, with the inlet end of the heat exchanger assembly connected to the return chamber and the outlet end of the heat exchanger assembly connected to the outlet interface. The water-cooled pipes of this utility model can absorb heat, making the water entering the heat exchanger assembly hot water, and then absorb heat again to become hotter water, thus rapidly increasing the water temperature and improving efficiency.

Description

Technical Field

[0001] This utility model relates to the field of gas water heater technology, specifically to a heat exchange system and a gas water heater. Background Technology

[0002] A gas water heater consists of a combustion chamber and a heat exchanger. The combustion chamber provides a closed space for the safe and efficient combustion of gas. The heat generated by the combustion of gas is transferred to the heat exchanger, which heats the cold water.

[0003] Related technologies include integrated coil water-cooled combustion chamber + heat exchanger. The water-cooled coil is wrapped outside the combustion chamber and can absorb the heat of the combustion chamber. This can lower the outer wall of the combustion chamber. The water-cooled coil is connected to the heat exchanger. However, the water-cooled coil is relatively long and has a large water resistance, which can easily cause abnormal pressure in the water circuit system of the gas water heater, resulting in slow water output, insufficient water volume, or even the risk of dry burning. Utility Model Content

[0004] In view of this, the present invention provides a heat exchange system and a gas water heater to solve the problems of long water-cooled coil length and high water resistance in related technologies.

[0005] In a first aspect, this utility model provides a heat exchange system, comprising:

[0006] The combustion chamber body includes an inlet wall and a return wall arranged opposite to each other. The inlet wall is provided with an inlet interface and an inlet chamber, and the return wall is provided with a return chamber. One of the inlet wall and the return wall is provided with an outlet interface.

[0007] Multiple water-cooling pipes are provided, and the water-cooling pipes are located on at least one side of the combustion chamber body. One end of the water-cooling pipe is connected to the water inlet chamber, and the other end is connected to the water return chamber.

[0008] A heat exchanger assembly is disposed within the combustion chamber body. The inlet end of the heat exchanger assembly is connected to the return water chamber, and the outlet end of the heat exchanger assembly is connected to the outlet interface.

[0009] Beneficial effects: Cooling water enters the inlet chamber inside the inlet wall through the inlet interface, and is then distributed to various water-cooled pipes. As it flows along the water-cooled pipes, it absorbs heat generated by combustion in the combustion chamber before entering the return water chamber. It then enters the heat exchanger assembly, where it continues to absorb heat. Finally, it flows out through the outlet interface. The water-cooled pipes absorb heat, ensuring the water entering the heat exchanger assembly is hot, and then absorbs heat again to become even hotter water, thus rapidly increasing water temperature and improving efficiency. Furthermore, because multiple water-cooled pipes can flow simultaneously, each extending from the inlet wall to the outlet wall, the water passage area is increased, and the water flow path is shortened. This significantly reduces water resistance, preventing problems such as abnormal water system pressure, slow water output, insufficient water flow, or even dry burning caused by excessive water resistance. Moreover, since the heat exchanger assembly is located inside the combustion chamber body, forming an integrated structure, there is no air leakage problem, and water connection is more convenient.

[0010] In one alternative embodiment, the heat exchanger assembly includes a heat exchanger comprising fins and a first heat exchange tube passing through the fins.

[0011] Beneficial effects: The heat exchanger includes fins and a first heat exchange tube passing through the fins. The fins can quickly absorb the heat generated by combustion and transfer the heat to the first heat exchange tube.

[0012] In one alternative embodiment, the first heat exchange tube has an elliptical cross-section, and the minor axis of the ellipse is perpendicular to the flue gas flow direction.

[0013] Beneficial effects: Since the cross-section of the first heat exchange tube is elliptical and the minor axis of the ellipse is perpendicular to the flue gas flow direction, the first heat exchange tube has a larger contact area with the fins, which can absorb more heat from the fins and improve thermal efficiency.

[0014] In one optional embodiment, the inlet wall is provided with a plurality of first connecting grooves, the return wall is provided with a plurality of second connecting grooves, the first end of the first heat exchange tube is connected to the inlet wall, the second end of the first heat exchange tube is connected to the return wall, and the plurality of first heat exchange tubes are connected sequentially through the first connecting grooves and the second connecting grooves.

[0015] Beneficial effects: The inlet wall is provided with multiple first connecting grooves, and the return wall is provided with multiple second connecting grooves. The first end of the first heat exchange tube is connected to the inlet wall, and the second end of the first heat exchange tube is connected to the return wall. Multiple first heat exchange tubes are connected sequentially through the first connecting grooves and the second connecting grooves. Therefore, there is no need to use additional connecting pipes to connect adjacent first heat exchange tubes, making the water circuit connection more convenient and the structure simpler. Furthermore, the two ends of the first heat exchange tube are fixed by the inlet wall and the return wall, making the heat exchanger and the combustion chamber body an integrated structure, eliminating the problem of air leakage.

[0016] In one optional embodiment, the heat exchanger assembly further includes a plurality of second heat exchange tubes connected in sequence, the plurality of second heat exchange tubes being located below the heat exchanger, the inlet of the first of the plurality of second heat exchange tubes constituting the water inlet end of the heat exchanger assembly, the last of the plurality of second heat exchange tubes being connected to the water inlet of the heat exchanger, and the outlet of the heat exchanger constituting the water outlet end of the heat exchanger assembly.

[0017] Beneficial effects: Because multiple second heat exchange tubes are located below the heat exchanger, the inlet of the first of the multiple second heat exchange tubes constitutes the water inlet of the heat exchanger assembly, the last of the multiple second heat exchange tubes is connected to the water inlet of the heat exchanger, and the water outlet of the heat exchanger constitutes the water outlet of the heat exchanger assembly. Cooling water enters the water inlet chamber inside the water inlet wall through the water inlet interface, and is then distributed to each water-cooled tube. During the flow along the water-cooled tubes, it absorbs the heat generated by combustion in the combustion chamber, enters the return water chamber, then enters the first second heat exchange tube, and flows through each second heat exchange tube in sequence. After flowing out from the last second heat exchange tube, it enters the heat exchanger, further absorbs heat and raises the water temperature during the flow along the second heat exchange tubes, and finally continues to absorb the heat generated by combustion during the flow along the heat exchanger, and finally flows out through the water outlet. The setting of the second heat exchange tubes can further absorb heat, so that the water entering the heat exchanger is hot water with a higher temperature, thus rapidly raising the water temperature and improving efficiency.

[0018] In one optional embodiment, the inlet wall is provided with at least one third connecting groove, the return wall is provided with at least one fourth connecting groove, the first end of the second heat exchange tube is connected to the inlet wall, the second end of the second heat exchange tube is connected to the return wall, and multiple second heat exchange tubes are connected sequentially through the third connecting groove and the fourth connecting groove.

[0019] Beneficial effects: The first end of the second heat exchange tube is connected to the inlet wall, and the second end of the second heat exchange tube is connected to the return wall. Multiple second heat exchange tubes are connected in sequence through the third and fourth connecting grooves. Therefore, there is no need to use additional connecting pipes to connect adjacent second heat exchange tubes, making water circuit connection more convenient and the structure simpler. Furthermore, the two ends of the second heat exchange tube are fixed by the inlet wall and the return wall, eliminating the need for additional structural components to fix the second heat exchange tube.

[0020] In one optional embodiment, one of the inlet wall and the return wall is further provided with a fifth connecting groove, which is inclined so that the outlet of the last second heat exchange tube is connected to the inlet of the heat exchanger.

[0021] Beneficial effects: The outlet of the last second heat exchange tube is connected to the inlet of the heat exchanger through the fifth connecting groove. The structure is simple and does not require additional connecting pipes to connect the second heat exchange tube and the heat exchanger.

[0022] In one optional embodiment, the water inlet wall includes an outer water inlet plate and an inner water inlet plate, with the water inlet chamber formed between the outer water inlet plate and the inner water inlet plate, and the inner water inlet plate being provided with a first connecting pipe port;

[0023] The return water wall includes an outer return water plate and an inner return water plate, and the return water chamber is formed between the outer return water plate and the inner return water plate. The inner return water plate is provided with a second inlet.

[0024] The two ends of the heat exchanger assembly and / or the water-cooled pipe are respectively connected to the first connecting port and the second connecting port.

[0025] Beneficial effects: By setting a first connecting port on the inner side plate of the inlet water and a second connecting port on the inner side plate of the return water, it is convenient to fix the two ends of the heat exchanger assembly and / or water-cooled pipe.

[0026] In one optional embodiment, the combustion chamber body further includes:

[0027] A connecting wall is provided between the inlet wall and the return wall. Two connecting walls are provided and arranged opposite to each other. The water-cooling pipe is located on the inner side of the connecting wall.

[0028] Beneficial effects: The water-cooled pipe is located on the inside of the connecting wall, which can better absorb the heat generated by combustion. Furthermore, because the water-cooled pipe absorbs the heat, the external temperature of the connecting wall is low, resulting in less heat loss.

[0029] In one optional embodiment, the connecting wall is provided with an arc-shaped groove, and the water-cooling pipe is disposed within the arc-shaped groove.

[0030] Beneficial effects: The inward-facing side of the water-cooled tube can directly exchange heat with the high-temperature flue gas, while the outward-facing side can make surface contact with the groove wall of the arc-shaped groove. This increases the heat exchange area between the water-cooled tube and the connecting wall, which helps to improve the heat exchange efficiency between the two and facilitates the positioning and installation of the water-cooled tube.

[0031] In one alternative embodiment, the arc length of the arc-shaped groove is less than or equal to half the circumference of the water-cooling pipe.

[0032] Beneficial effect: It can increase the surface area of ​​the water-cooled pipes that absorbs the heat generated by combustion.

[0033] In one alternative embodiment, both ends of the water-cooling pipe extend beyond the connecting wall.

[0034] Beneficial effects: The two ends of the water-cooling pipe extend out of the connecting wall, which facilitates the connection of the two ends of the water-cooling pipe to the inlet wall and the return wall.

[0035] In one alternative embodiment, the combustion chamber body, and / or the water-cooled pipe, and / or the heat exchanger assembly are made of stainless steel.

[0036] Beneficial effects: The combustion chamber body, water cooling pipes, and heat exchanger components are made of stainless steel, and the corrosion resistance of stainless steel can effectively reduce the risk of water pipe leakage.

[0037] In one optional embodiment, the water inlet is connected to a water inlet connector, and the water outlet is connected to a water outlet connector.

[0038] Beneficial effects: The inlet and outlet connectors facilitate connection with the inlet and outlet pipes.

[0039] Secondly, this utility model also provides a gas water heater, comprising:

[0040] The aforementioned heat exchange system.

[0041] Beneficial effects: In this gas water heater, cooling water enters the inlet chamber inside the inlet wall through the inlet interface. It is then distributed to various water-cooled pipes. As the water flows along these pipes, it absorbs heat generated by combustion in the combustion chamber before entering the return chamber. From there, it enters the heat exchanger assembly, where it continues to absorb heat. Finally, it flows out through the outlet interface. The water-cooled pipes absorb heat, ensuring the water entering the heat exchanger assembly is hot. This heat absorption further increases the water temperature, thus improving efficiency. Furthermore, because multiple water-cooled pipes can flow simultaneously, each extending from the inlet wall to the outlet wall, the water flow area is increased, and the flow path is shortened. This significantly reduces water resistance, preventing problems such as abnormal water system pressure, slow water flow, insufficient water volume, or even dry burning caused by excessive water resistance. Moreover, since the heat exchanger assembly is located inside the combustion chamber, forming an integrated structure, there is no air leakage, and water connections are more convenient. Attached Figure Description

[0042] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of a heat exchange system according to an embodiment of the present utility model. Figure 1 ;

[0044] Figure 2 This is a schematic diagram of a heat exchange system according to an embodiment of the present utility model. Figure 2 ;

[0045] Figure 3 This is an exploded view of a heat exchange system according to an embodiment of the present invention;

[0046] Figure 4 An exploded view of the inlet wall;

[0047] Figure 5 An exploded view of the backwater wall;

[0048] Figure 6 for Figure 3 Schematic diagram of the intermediate heat exchanger;

[0049] Figure 7 A schematic diagram of the heat exchanger when the cross-section of the first heat exchange tube is elliptical;

[0050] Figure 8A schematic diagram showing the water-cooled pipes assembled on the connecting wall;

[0051] Figure 9 Front view of the water-cooled pipes after they are assembled into the connecting wall;

[0052] Figure 10 Side view of the water-cooled pipes assembled behind the connecting wall;

[0053] Figure 11 A schematic diagram showing the heat exchanger, second heat exchange tube, connecting wall, water-cooled pipe and return water wall assembled together;

[0054] Figure 12 This is a schematic diagram showing the heat exchanger, second heat exchange tube, connecting wall, water cooling tube, return water wall, and inlet inner side plate assembled together.

[0055] Figure 13 This is a schematic diagram of a heat exchange system according to an embodiment of the present invention, after partial cross-section.

[0056] Figure 14 This is a schematic diagram of a heat exchange system according to an embodiment of the present invention, with the water flow direction marked in the return water chamber;

[0057] Figure 15 This is a schematic diagram showing the inlet connector, outlet connector, and inlet outer side plate not assembled together.

[0058] Figure 16 This is a schematic diagram showing the assembly of the inlet connector, outlet connector, and inlet outer side plate.

[0059] Explanation of reference numerals in the attached figures:

[0060] 1. Inlet wall; 101. Inlet outer side plate; 1011. Inlet port; 1012. Outlet port; 1013. First connecting groove; 1014. Third connecting groove; 1015. First protrusion; 1016. First groove; 1017. First connecting edge; 102. Inlet inner side plate; 1021. First connecting pipe; 1022. Second groove; 103. Inlet chamber; 2. Return wall; 201. Return outer side plate; 2011. Second connecting groove; 2012. First connecting edge; 1013. First connecting groove; 1014. Third connecting groove; 1015. First protrusion; 1016. First groove; 1017. First connecting edge; 102. Inlet inner side plate; 1021. First connecting pipe; 1022. Second connecting groove; 103. Inlet chamber; 2. Return wall; 201. Return outer side plate; 2011. Second connecting groove; 2012. Third connecting groove; 1013. First connecting groove; 1014. Third connecting groove; 1015. First protrusion; 1016. First groove; 1017. First connecting edge; 102. Inlet inner side plate; 1021. First connecting pipe; 1022. Second connecting groove; 1013. Third connecting groove; 1014. Third connecting groove; 1015. First protrusion; 1016. First groove; 1017. First connecting edge; 1018. Four-way connecting groove; 2013, fifth connecting groove; 2014, second protrusion; 2015, third groove; 202, inner side plate for return water; 2021, second connecting pipe; 2022, fourth groove; 203, return water chamber; 2031, third section; 2032, fourth section; 3, water-cooled pipe; 4, heat exchanger; 401, fins; 402, first heat exchange pipe; 5, second heat exchange pipe; 6, connecting wall; 601, arc-shaped groove; 7, inlet connector; 8, outlet connector. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0062] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0063] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0064] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0065] A gas water heater consists of a combustion chamber and a heat exchanger. The combustion chamber provides a closed space for the safe and efficient combustion of gas. The heat generated by the combustion of gas is transferred to the heat exchanger, which heats the cold water.

[0066] Related technologies include integrated coil water-cooled combustion chamber + heat exchanger. The water-cooled coil is wrapped outside the combustion chamber and can absorb the heat of the combustion chamber. This can lower the outer wall of the combustion chamber. The water-cooled coil is connected to the heat exchanger. However, the water-cooled coil is relatively long and has a large water resistance, which can easily cause abnormal pressure in the water circuit system of the gas water heater, resulting in slow water output, insufficient water volume, or even the risk of dry burning.

[0067] The following is combined with Figures 1 to 16 The following describes embodiments of the present invention.

[0068] According to an embodiment of the present invention, a heat exchange system is provided, including a combustion chamber body, a water-cooled pipe 3, and a heat exchanger assembly.

[0069] The combustion chamber body includes an inlet wall 1 and a return wall 2 arranged opposite to each other. The inlet wall 1 is provided with an inlet interface 1011 and an inlet chamber 103, and the return wall 2 is provided with a return chamber 203. One of the inlet wall 1 and the return wall 2 is provided with an outlet interface 1012. Multiple water-cooled pipes 3 are provided and are located on at least one side of the combustion chamber body. One end of the water-cooled pipe 3 is connected to the inlet chamber 103 and the other end is connected to the return chamber 203. A heat exchanger assembly is located in the combustion chamber body. The inlet end of the heat exchanger assembly is connected to the return chamber 203, and the outlet end of the heat exchanger assembly is connected to the outlet interface 1012.

[0070] In this embodiment, cooling water enters the inlet chamber 103 inside the inlet wall 1 through the inlet port 1011, and is then distributed to each water-cooled pipe 3. As it flows along the water-cooled pipe 3, it absorbs the heat generated by combustion in the combustion chamber, then enters the return chamber 203, and subsequently enters the heat exchanger assembly. While flowing along the heat exchanger assembly, it continues to absorb the heat generated by combustion, and finally flows out through the outlet port 1012. The water-cooled pipe 3 is designed to absorb heat, making the water entering the heat exchanger assembly hot water, which then absorbs heat again to become even hotter water, thus rapidly increasing the water temperature and improving efficiency. Furthermore, since multiple water-cooled pipes 3 can flow simultaneously, each extending from the inlet wall 1 to the outlet wall, the water path area of ​​the water-cooled pipes 3 is increased, and the water flow path is shortened. This significantly reduces water resistance, avoiding problems such as abnormal water system pressure, slow water output, insufficient water flow, or even dry burning caused by excessive water resistance. Furthermore, since the heat exchanger assembly is located inside the combustion chamber body, the heat exchanger assembly and the combustion chamber body form an integrated structure, eliminating the air leakage problem and making water circuit connection more convenient.

[0071] Specifically, such as Figure 3 As shown, water cooling pipe 3 is a straight pipe, which can greatly reduce water resistance and avoid problems such as abnormal water system pressure, slow water output, insufficient water volume, or even dry burning caused by excessive water resistance.

[0072] In addition, under the action of water flow, the heat of the combustion flame is basically not transferred to the periphery of the combustion chamber body, and the heat loss is very small.

[0073] In one specific embodiment, the water outlet 1012 is located on the water inlet wall 1.

[0074] In one embodiment, the heat exchanger assembly includes a heat exchanger 4, which includes fins 401 and a first heat exchange tube 402 passing through the fins 401.

[0075] In this embodiment, the heat exchanger 4 includes fins 401 and a first heat exchange tube 402 passing through the fins 401. The fins 401 can quickly absorb the heat generated by combustion and transfer the heat to the first heat exchange tube 402.

[0076] In one specific embodiment, during assembly, the first heat exchange tube 402 is inserted into the hole of the fin 401, and the inner diameter of the first heat exchange tube 402 is expanded using a tube expansion tool so that the first heat exchange tube 402 and the fin 401 are in close contact. Then, welding material is used to tightly weld the first heat exchange tube 402 and the fin 401 together to form a heat exchanger 4.

[0077] In one embodiment, such as Figure 7 As shown, the cross-section of the first heat exchange tube 402 is elliptical, and the minor axis of the ellipse is perpendicular to the flue gas flow direction.

[0078] In this embodiment, since the cross-section of the first heat exchange tube 402 is elliptical and the minor axis of the ellipse is perpendicular to the flue gas flow direction, the first heat exchange tube 402 has a larger contact area with the fins 401, which can absorb more heat from the fins 401 and improve thermal efficiency.

[0079] It should be noted that when the cross-section of the first heat exchange tube 402 is elliptical, the holes of the fins 401 are also elliptical.

[0080] In one embodiment, such as Figure 6 As shown, the cross-section of the first heat exchange tube 402 is circular.

[0081] In one embodiment, the inlet wall 1 is provided with a plurality of first connecting grooves 1013, the return wall 2 is provided with a plurality of second connecting grooves 2011, the first end of the first heat exchange tube 402 is connected to the inlet wall 1, the second end of the first heat exchange tube 402 is connected to the return wall 2, and the plurality of first heat exchange tubes 402 are connected sequentially through the first connecting grooves 1013 and the second connecting grooves 2011.

[0082] In this embodiment, the inlet wall 1 is provided with multiple first connecting grooves 1013, and the return wall 2 is provided with multiple second connecting grooves 2011. The first end of the first heat exchange tube 402 is connected to the inlet wall 1, and the second end of the first heat exchange tube 402 is connected to the return wall 2. Multiple first heat exchange tubes 402 are connected sequentially through the first connecting grooves 1013 and the second connecting grooves 2011. Therefore, there is no need to use additional connecting pipes to connect adjacent first heat exchange tubes 402, making the water circuit connection more convenient and the structure simpler. Furthermore, the two ends of the first heat exchange tube 402 are fixed by the inlet wall 1 and the return wall 2, making the heat exchanger 4 and the combustion chamber body an integrated structure, eliminating the air leakage problem.

[0083] In one specific embodiment, a first connecting groove 1013 is directly opposite a portion of a second connecting groove 2011, and another portion of the second connecting groove 2011 is directly opposite a portion of an adjacent first connecting groove 1013. The same first connecting groove 1013 or second connecting groove 2011 is simultaneously opposite to two adjacent first heat exchange tubes 402, thereby enabling multiple first heat exchange tubes 402 to be connected sequentially through the first connecting groove 1013 and the second connecting groove 2011.

[0084] In one embodiment, the heat exchanger assembly further includes a plurality of second heat exchange tubes 5 connected in sequence. The plurality of second heat exchange tubes 5 are located below the heat exchanger 4. The inlet of the first of the plurality of second heat exchange tubes 5 constitutes the water inlet end of the heat exchanger assembly. The last of the plurality of second heat exchange tubes 5 is connected to the water inlet of the heat exchanger 4. The outlet of the heat exchanger 4 constitutes the water outlet end of the heat exchanger assembly.

[0085] In this embodiment, since multiple second heat exchange tubes 5 are located below the heat exchanger 4, the inlet of the first of the multiple second heat exchange tubes 5 constitutes the water inlet of the heat exchanger assembly, the last of the multiple second heat exchange tubes 5 is connected to the water inlet of the heat exchanger 4, and the outlet of the heat exchanger 4 constitutes the water outlet of the heat exchanger assembly. Cooling water enters the water inlet chamber 103 inside the water inlet wall 1 through the water inlet interface 1011, and is then distributed to each water-cooled tube 3. During the flow along the water-cooled tubes 3, it absorbs the combustion gases generated in the combustion chamber. After absorbing heat, the water enters the return water chamber 203, then the first second heat exchange tube 5, and flows through each of the second heat exchange tubes 5 in sequence. After flowing out from the last second heat exchange tube 5, it enters the heat exchanger 4. During the flow along the second heat exchange tubes 5, it further absorbs heat to raise the water temperature. Finally, during the flow along the heat exchanger 4, it continues to absorb the heat generated by combustion, and finally flows out through the water outlet 1012. The setting of the second heat exchange tubes 5 can further absorb heat, so that the water entering the heat exchanger 4 is hot water with a higher temperature, thus quickly raising the water temperature and improving efficiency.

[0086] It should be noted that, in combination Figure 3 In the figure, the second heat exchange tube 5 on the far right is the first second heat exchange tube 5, the second heat exchange tube 5 on the far left is the last second heat exchange tube 5, the first heat exchange tube 402 on the far left is the first first heat exchange tube 402, and the first heat exchange tube 402 on the far right is the last first heat exchange tube 402.

[0087] In one specific embodiment, when the fins 401 of the heat exchanger 4 are copper fins 401, since copper fins 401 have high efficiency, the second heat exchange tube 5 does not need to be provided. When the fins 401 of the heat exchanger 4 are stainless steel fins 401, since stainless steel has relatively low heat exchange efficiency, a row of second heat exchange tubes 5 needs to be provided below the heat exchanger 4.

[0088] In one embodiment, the inlet wall 1 is provided with at least one third connecting groove 1014, the return wall 2 is provided with at least one fourth connecting groove 2012, the first end of the second heat exchange tube 5 is connected to the inlet wall 1, the second end of the second heat exchange tube 5 is connected to the return wall 2, and multiple second heat exchange tubes 5 are connected sequentially through the third connecting groove 1014 and the fourth connecting groove 2012.

[0089] In this embodiment, the first end of the second heat exchange tube 5 is connected to the inlet wall 1, and the second end of the second heat exchange tube 5 is connected to the return wall 2. Multiple second heat exchange tubes 5 are connected sequentially through the third connecting groove 1014 and the fourth connecting groove 2012. Therefore, there is no need to use additional connecting pipes to connect adjacent second heat exchange tubes 5, making the water circuit connection more convenient and the structure simpler. Furthermore, the two ends of the second heat exchange tube 5 are fixed by the inlet wall 1 and the return wall 2, eliminating the need for additional structural components to fix the second heat exchange tube 5.

[0090] In one specific embodiment, a third connecting groove 1014 is directly opposite a portion of a fourth connecting groove 2012, and another portion of the fourth connecting groove 2012 is directly opposite a portion of an adjacent third connecting groove 1014. The same third connecting groove 1014 or fourth connecting groove 2012 is simultaneously opposite to two adjacent second heat exchange tubes 5, thereby enabling multiple second heat exchange tubes 5 to be connected sequentially through the third connecting groove 1014 and the fourth connecting groove 2012.

[0091] In one embodiment, one of the inlet wall 1 and the return wall 2 is further provided with a fifth connecting groove 2013, which is inclined so that the outlet of the last second heat exchange tube 5 is connected to the inlet of the heat exchanger 4.

[0092] In this embodiment, the outlet of the last second heat exchange tube 5 is connected to the inlet of the heat exchanger 4 through the fifth connecting groove 2013. The structure is simple and does not require additional connecting pipes to connect the second heat exchange tube 5 and the heat exchanger 4.

[0093] In one specific embodiment, the fifth connecting channel 2013 is provided on the return water wall 2.

[0094] In one embodiment, the water inlet wall 1 includes an outer water inlet plate 101 and an inner water inlet plate 102, with a water inlet chamber 103 formed between the outer water inlet plate 101 and the inner water inlet plate 102, and the inner water inlet plate 102 is provided with a first inlet port 1021; the water return wall 2 includes an outer water return plate 201 and an inner water return plate 202, with a water return chamber 203 formed between the outer water return plate 201 and the inner water return plate 202, and the inner water return plate 202 is provided with a second inlet port 2021; the two ends of the heat exchanger assembly and / or the water-cooled pipe 3 are respectively connected to the first inlet port 1021 and the second inlet port 2021.

[0095] In this embodiment, by providing a first connecting port 1021 on the inner side plate 102 for the water inlet and a second connecting port 2021 on the inner side plate 202 for the water return, it is convenient to fix the two ends of the heat exchanger assembly and / or the water cooling pipe 3.

[0096] In one specific embodiment, the two ends of the water-cooling pipe 3 are fixed to the first connecting port 1021 and the second connecting port 2021, respectively. Specifically, the two ends of the water-cooling pipe 3 are fixed to the first connecting port 1021 and the second connecting port 2021 by circumferential welding.

[0097] In one specific embodiment, the two ends of the first heat exchange tube 402 of the heat exchanger 4 are fixed to the first connecting port 1021 and the second connecting port 2021, respectively. Specifically, the two ends of the first heat exchange tube 402 are fixed to the first connecting port 1021 and the second connecting port 2021 by circumferential welding.

[0098] In one specific embodiment, the two ends of the second heat exchange tube 5 are fixed to the first connecting port 1021 and the second connecting port 2021, respectively. Specifically, the two ends of the second heat exchange tube 5 are fixed to the first connecting port 1021 and the second connecting port 2021 by circumferential welding.

[0099] In one embodiment, the water inlet chamber 103 includes a first chamber segment and a second chamber segment. The first chamber segment is connected to the water inlet interface 1011, and the second chamber segment is connected to the first chamber segment and the water cooling pipe 3. The second chamber segment is arranged around the outer periphery of the first chamber segment.

[0100] During the operation of the heat exchange system, cooling water sequentially enters the water-cooled pipe 3 through the inlet port 1011, the first chamber section, and the second chamber section. The second chamber section is arranged around the outside of the first chamber section. This arrangement ensures that the flow area of ​​the water along the flow path remains almost unchanged, thereby reducing water resistance and preventing changes in the water flow pattern from impacting the inlet chamber 103, thus enhancing the water pressure resistance of the inlet chamber 103. Because the second chamber section surrounds the outer periphery of the first chamber section, the inlet chamber 103 has a large area. The water in the inlet chamber 103 can quickly absorb the heat transferred to the inlet wall 1 by the flame combustion, and the flowing water transports the absorbed heat to the heat exchanger assembly.

[0101] As a possible implementation, in one embodiment not shown in the accompanying drawings, the water inlet chamber 103 includes a main water inlet and a plurality of water inlet branches connected in sequence. The main water inlet is connected to the water inlet interface 1011, and the plurality of water inlet branches are connected in parallel between the main water inlet and the water cooling pipe 3.

[0102] In one embodiment, such as Figure 4 As shown, the water inlet wall 1 includes an outer water inlet plate 101 and an inner water inlet plate 102 arranged opposite to each other. A water inlet interface 1011 is provided on the outer water inlet plate 101, and a water cooling pipe 3 is connected to the inner water inlet plate 102. The outer water inlet plate 101 is provided with a first protrusion 1015 and a first groove 1016. The first protrusion 1015 protrudes away from the inner water inlet plate 102, and the first groove 1016 is provided in the middle of the first protrusion 1015 and is recessed towards the inner water inlet plate 102. The inner water inlet plate 102 is provided with a second groove 1022. The second groove 1022 is provided at the corresponding position of the first groove 1016 and is recessed away from the outer water inlet plate 101. A first cavity is provided between the first groove 1016 and the second groove 1022, and a second cavity is provided between the first protrusion 1015 and the inner water inlet plate 102.

[0103] With this configuration, the first groove 1016, the first protrusion 1015, and the second groove 1022 can not only form the first cavity and the second cavity in the water inlet wall 1, but the curved first groove 1016, the first protrusion 1015, and the second groove 1022 can also increase the structural strength of the first sidewall and the second sidewall, thereby enhancing the water inlet wall 1's ability to resist water flow impact and helping to extend the service life of the combustion chamber assembly.

[0104] In one embodiment, such as Figure 4 As shown, the outer side plate 101 of the water inlet is also provided with a first connecting edge 1017, which surrounds the first protrusion 1015 and is used to connect the inner side plate 102 of the water inlet.

[0105] In one embodiment, the first connecting edge 1017 is welded to the inner side plate 102 of the water inlet.

[0106] This configuration not only connects the outer water inlet plate 101 to the inner water inlet plate 102, but also helps to improve the sealing performance of the water inlet chamber 103.

[0107] As an alternative implementation, in an embodiment not shown in the accompanying drawings, the outer water inlet plate 101 and the inner water inlet plate 102 may also be connected by adhesive bonding or bolting.

[0108] In one embodiment, such as Figure 5As shown, the return water chamber 203 includes a third section 2031 and a fourth section 2032. The third section 2031 is connected to each water-cooled pipe 3, and the fourth section 2032 is connected to the third section 2031 and the first second heat exchange pipe 5. The third section 2031 is annular.

[0109] During the use of the combustion chamber assembly, cooling water can flow sequentially through water-cooled pipe 3, third section 2031 and fourth section 2032 to the heat exchanger assembly. Along the flow path of the cooling water, the flow area of ​​the water flow hardly changes, thereby reducing water resistance and avoiding the impact of changes in the flow pattern on the water inlet chamber 103, which helps to strengthen the water inlet chamber 103's ability to withstand water pressure.

[0110] As an alternative implementation, in one embodiment not shown in the accompanying drawings, the water outlet chamber includes a water outlet branch and a water outlet main connected in sequence, multiple water outlet branches are connected in parallel to each other, connecting the water outlet main and the water-cooled pipe 3, and the water outlet main is connected to the first and second heat exchange pipes 5.

[0111] In one embodiment, such as Figure 3 and Figure 5 As shown, the return water wall 2 includes an outer return water plate 201 and an inner return water plate 202 arranged opposite to each other. The water cooling pipe 3 is connected to the inner return water plate 202. The outer return water plate 201 is provided with a second protrusion 2014 and a third groove 2015. The second protrusion 2014 protrudes away from the inner return water plate 202. The third groove 2015 is located in the middle of the second protrusion 2014 and is recessed towards the inner return water plate 202. The inner return water plate 202 is provided with a fourth groove 2022. The fourth groove 2022 is located at the corresponding position of the third groove 2015 and is recessed away from the outer return water plate 201. The third cavity section 2031 is located between the third groove 2015 and the fourth groove 2022.

[0112] With this configuration, the cooperation of the third groove 2015, the fourth groove 2022, and the second protrusion 2014 not only forms a third cavity 2031 in the inlet wall 1, but the curved third groove 2015, the fourth groove 2022, and the second protrusion 2014 also increase the structural strength of the third and fourth side walls, thereby enhancing the water return wall 2's resistance to water flow impact and helping to extend the service life of the combustion chamber assembly.

[0113] In one embodiment, the combustion chamber body further includes a connecting wall 6, which is connected between the water inlet wall 1 and the water return wall 2. Two connecting walls 6 are provided and arranged opposite to each other, and the water cooling pipe 3 is located on the inner side of the connecting wall 6.

[0114] In this embodiment, the water-cooling pipe 3 is located inside the connecting wall 6, which can better absorb the heat generated by combustion. Furthermore, since the water-cooling pipe 3 absorbs the heat, the external temperature of the connecting wall 6 is low, resulting in less heat loss.

[0115] In one embodiment not shown in the figure, when there are many water-cooled pipes 3 and they are sequentially and sealed together, the water-cooled pipes 3 can form the sidewall of the combustion chamber body.

[0116] In one embodiment, the connecting wall 6 is provided with an arc-shaped groove 601, and the water-cooling pipe 3 is disposed in the arc-shaped groove 601.

[0117] In this embodiment, the inward-facing side of the water-cooled pipe 3 can directly exchange heat with the high-temperature flue gas, and the outward-facing side of the water-cooled pipe 3 can make surface contact with the groove wall of the arc-shaped groove 601. This can increase the heat exchange area between the water-cooled pipe 3 and the connecting wall 6, which helps to improve the heat exchange efficiency between the two and facilitates the positioning and installation of the water-cooled pipe 3.

[0118] In one embodiment, the arc length of the arc-shaped groove 601 is less than or equal to half the circumference of the water-cooling pipe 3.

[0119] In this embodiment, the area of ​​the water-cooled pipe 3 that absorbs the heat generated by combustion can be increased.

[0120] In a preferred embodiment, the arc length of the arc-shaped groove 601 is set to be equal to half the circumference of the water-cooling pipe 3, which can maximize the contact area between the connecting wall 6 and the water-cooling pipe 3.

[0121] In one embodiment, the two ends of the water-cooled pipe 3 extend out of the connecting wall 6.

[0122] In this embodiment, the two ends of the water-cooling pipe 3 extend out of the connecting wall 6, which facilitates the connection of the two ends of the water-cooling pipe 3 with the water inlet wall 1 and the water return wall 2.

[0123] In a preferred embodiment, such as Figure 10 As shown, the length of the water-cooled pipe 3 extending out of the connecting wall 6 at both ends is L, where 2mm≤L≤5mm.

[0124] In one embodiment, the combustion chamber body, and / or water-cooled pipe 3, and / or heat exchanger assembly are made of stainless steel.

[0125] In related technologies, the combustion chamber of gas water heaters is generally made of copper, and copper water pipes pose a risk of corrosion and leakage.

[0126] The combustion chamber body, water-cooling pipe 3, and heat exchanger assembly of the gas water heater in this embodiment are made of stainless steel. The corrosion resistance of stainless steel effectively reduces the risk of water pipe leakage. Furthermore, the use of stainless steel for water pipes and the combustion chamber body presents a challenge in shaping. In this embodiment, the water-cooling pipe 3 uses multiple parallel straight pipes instead of a single coil surrounding the combustion chamber body. The combustion chamber body is composed of an inlet wall 1, a return wall 2, and a connecting wall 6. This eliminates the need for bending during assembly, avoiding the springback and forming resistance inherent in stainless steel during processing. This overcomes the shaping difficulties associated with using stainless steel for the combustion chamber body and water-cooling pipe 3.

[0127] In one embodiment, the water inlet 1011 is connected to the water inlet connector 7, and the water outlet 1012 is connected to the water outlet connector 8.

[0128] In this embodiment, the inlet connector 7 and the outlet connector 8 are designed to facilitate connection with the inlet pipe and the outlet pipe.

[0129] In one specific embodiment, the water inlet 1011 and the water outlet 1012 are both located on the outer side plate 101 of the water inlet. The water inlet connector 7 is inserted into the water inlet 1011 and is sealed to the water inlet 1011 by welding. The water outlet connector 8 is inserted into the water outlet 1012 and is sealed to the water outlet 1012 by welding.

[0130] According to an embodiment of the present invention, another aspect provides a gas water heater, including the heat exchange system provided in the above embodiment.

[0131] In this gas water heater, cooling water enters the inlet chamber 103 inside the inlet wall 1 through the inlet port 1011. It is then distributed to various water-cooled pipes 3. As the water flows along the water-cooled pipes 3, it absorbs heat generated by combustion in the combustion chamber before entering the return chamber 203. Next, it enters the heat exchanger assembly, where it continues to absorb heat. Finally, it flows out through the outlet port 1012. The water-cooled pipes 3 absorb heat, ensuring the water entering the heat exchanger assembly is hot. It then absorbs heat again to become even hotter water, thus rapidly increasing the water temperature and improving efficiency. Furthermore, since multiple water-cooled pipes 3 can flow simultaneously, each extending from the inlet wall 1 to the outlet wall, the water path area of ​​the water-cooled pipes 3 is increased, and the water flow path is shortened. This significantly reduces water resistance, preventing problems such as abnormal water system pressure, slow water flow, insufficient water volume, or even dry burning caused by excessive water resistance. Furthermore, since the heat exchanger assembly is located inside the combustion chamber body, the heat exchanger assembly and the combustion chamber body form an integrated structure, eliminating the air leakage problem and making water circuit connection more convenient.

[0132] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A heat exchange system, characterized in that, include: The combustion chamber body includes an inlet wall (1) and a return wall (2) arranged opposite to each other. The inlet wall (1) is provided with an inlet port (1011) and an inlet chamber (103). The return wall (2) is provided with a return chamber (203). One of the inlet wall (1) and the return wall (2) is provided with an outlet port (1012). Multiple water-cooled pipes (3) are provided. The water-cooled pipes (3) are located at least one side of the combustion chamber body. One end of the water-cooled pipe (3) is connected to the water inlet chamber (103), and the other end is connected to the water return chamber (203). A heat exchanger assembly is disposed within the combustion chamber body. The inlet end of the heat exchanger assembly is connected to the return water chamber (203), and the outlet end of the heat exchanger assembly is connected to the outlet interface (1012).

2. The heat exchange system according to claim 1, characterized in that, The heat exchanger assembly includes a heat exchanger (4) that includes fins (401) and a first heat exchange tube (402) passing through the fins (401).

3. The heat exchange system according to claim 2, characterized in that, The first heat exchange tube (402) has an elliptical cross-section, and the minor axis of the ellipse is perpendicular to the flue gas flow direction.

4. The heat exchange system according to claim 2, characterized in that, The inlet wall (1) is provided with a plurality of first connecting grooves (1013), and the return wall (2) is provided with a plurality of second connecting grooves (2011). The first end of the first heat exchange tube (402) is connected to the inlet wall (1), and the second end of the first heat exchange tube (402) is connected to the return wall (2). The plurality of first heat exchange tubes (402) are connected in sequence through the first connecting grooves (1013) and the second connecting grooves (2011).

5. The heat exchange system according to claim 2, characterized in that, The heat exchanger assembly also includes multiple second heat exchange tubes (5) connected in sequence. The multiple second heat exchange tubes (5) are located below the heat exchanger (4). The inlet of the first of the multiple second heat exchange tubes (5) constitutes the water inlet of the heat exchanger assembly. The last of the multiple second heat exchange tubes (5) is connected to the water inlet of the heat exchanger (4). The outlet of the heat exchanger (4) constitutes the water outlet of the heat exchanger assembly.

6. The heat exchange system according to claim 5, characterized in that, The inlet wall (1) is provided with at least one third connecting groove (1014), and the return wall (2) is provided with at least one fourth connecting groove (2012). The first end of the second heat exchange tube (5) is connected to the inlet wall (1), and the second end of the second heat exchange tube (5) is connected to the return wall (2). Multiple second heat exchange tubes (5) are connected sequentially through the third connecting groove (1014) and the fourth connecting groove (2012).

7. The heat exchange system according to claim 5, characterized in that, One of the inlet wall (1) and the return wall (2) is further provided with a fifth connecting groove (2013), which is inclined so that the outlet of the last second heat exchange tube (5) is connected to the inlet of the heat exchanger (4).

8. The heat exchange system according to any one of claims 1 to 7, characterized in that, The water inlet wall (1) includes an outer water inlet plate (101) and an inner water inlet plate (102), and the water inlet chamber (103) is formed between the outer water inlet plate (101) and the inner water inlet plate (102). The inner water inlet plate (102) is provided with a first connecting port (1021). The return water wall (2) includes a return water outer side plate (201) and a return water inner side plate (202), and the return water chamber (203) is formed between the return water outer side plate (201) and the return water inner side plate (202). The return water inner side plate (202) is provided with a second connecting port (2021). The two ends of the heat exchanger assembly and / or the water-cooled pipe (3) are respectively connected to the first connecting port (1021) and the second connecting port (2021).

9. The heat exchange system according to any one of claims 1 to 7, characterized in that, The combustion chamber body also includes: A connecting wall (6) is connected between the inlet wall (1) and the return wall (2). Two connecting walls (6) are provided and arranged opposite to each other. The water cooling pipe (3) is located on the inner side of the connecting wall (6).

10. The heat exchange system according to claim 9, characterized in that, The connecting wall (6) is provided with an arc-shaped groove (601), and the water-cooling pipe (3) is located in the arc-shaped groove (601).

11. The heat exchange system according to claim 10, characterized in that, The arc length of the arc-shaped groove (601) is less than or equal to half the circumference of the water-cooling pipe (3).

12. The heat exchange system according to claim 10, characterized in that, The two ends of the water-cooled pipe (3) extend out of the connecting wall (6).

13. The heat exchange system according to any one of claims 1 to 7, characterized in that, The combustion chamber body, and / or the water-cooled pipe (3), and / or the heat exchanger assembly are made of stainless steel.

14. The heat exchange system according to any one of claims 1 to 7, characterized in that, The water inlet (1011) is connected to a water inlet connector (7), and the water outlet (1012) is connected to a water outlet connector (8).

15. A gas-fired water heater, characterized in that, include: The heat exchange system according to any one of claims 1 to 14.

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