Heat exchange system and gas water heater

Abstract

The invention relates to the technical field of gas water heaters, and discloses a heat exchange system and a gas water heater, the heat exchange system comprises a combustion chamber main body, the combustion chamber main body comprises a water inlet wall and a water return wall which are oppositely arranged, the water inlet wall is provided with a water inlet connector and a water inlet cavity, the water return wall is provided with a water return cavity, and one of the water inlet wall and the water return wall is provided with a water outlet connector; the water cooling pipes are arranged on at least one side of the combustion chamber body, one ends of the water cooling pipes communicate with the water inlet cavity, and the other ends of the water cooling pipes communicate with the water return cavity; the heat exchanger assembly is arranged in the combustion chamber body, the water inlet end of the heat exchanger assembly communicates with the water return cavity, and the water outlet end of the heat exchanger assembly communicates with the water outlet connector. The arrangement of the water cooling pipe can absorb heat, so that water entering the heat exchanger assembly is hot water and then absorbs heat again to become water with higher temperature, and therefore, the water temperature can be quickly increased, and the efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas water heaters, and in particular to a heat exchange system and a gas water heater. Background Art

[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 gas combustion is transferred to the heat exchanger flowing through it, thereby heating the cold water.

[0003] Related technologies include an integrated coil water-cooled combustion chamber + heat exchanger. The water-cooled coil is wrapped outside the combustion chamber and can absorb the heat from the combustion chamber, lowering the outer wall of the combustion chamber. The water-cooled coil is connected to the heat exchanger. However, the water-cooled coil is long and has a large water resistance, which can easily cause abnormal pressure in the water system of the gas water heater, resulting in slower water output, insufficient water volume, and even the risk of dry burning. Summary of the Invention

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

[0005] In a first aspect, the present invention provides a heat exchange system comprising:

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

[0007] A plurality of water cooling pipes are provided, each of which is provided at at least one side of the combustion chamber body, one end of each water cooling pipe being connected to the water inlet chamber, and the other end of each water cooling pipe being connected to the water return chamber;

[0008] The heat exchanger assembly is arranged in the combustion chamber body, the water inlet end of the heat exchanger assembly is communicated with the return water chamber, and the water outlet end of the heat exchanger assembly is communicated with the water outlet interface.

[0009] Beneficial effect: Cooling water can enter the water inlet chamber inside the water inlet wall through the water inlet interface, and then be distributed to each water-cooling pipe. After absorbing the heat generated by the combustion in the combustion chamber while flowing along the water-cooling pipe, it enters the return water chamber, and then enters the heat exchanger assembly. While flowing along the heat exchanger assembly, it continues to absorb the heat generated by the combustion, and finally flows out through the water outlet interface. The arrangement of the water-cooling pipe can absorb heat, so that the water entering the heat exchanger assembly is hot water, and then absorbs heat again to become water with a higher temperature, so that the water temperature can be quickly increased and the efficiency is improved. In addition, since multiple water-cooling pipes can pass water at the same time, each water-cooling pipe extends from the water inlet wall to the water outlet wall, thereby increasing the water channel area of ​​the water-cooling pipe and shortening the water flow path of the water-cooling pipe, thereby greatly reducing the water resistance, avoiding problems such as abnormal water system pressure caused by excessive water resistance, slow water discharge, insufficient water volume, or even dry burning. In addition, since the heat exchanger assembly is arranged in the combustion chamber body, the heat exchanger assembly and the combustion chamber body form an integrated structure, there is no air leakage problem, and the water channel connection is more convenient.

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

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

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

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

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

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

[0016] In an 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 are located below the heat exchanger, the water inlet of the first of the plurality of second heat exchange tubes constitutes the water inlet end of the heat exchanger assembly, the last of the plurality of 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 end of the heat exchanger assembly.

[0017] Beneficial effect: Since the multiple second heat exchange tubes are located below the heat exchanger, the water inlet of the first second heat exchange tube among the multiple second heat exchange tubes constitutes the water inlet end of the heat exchanger assembly, and the last second heat exchange tube among the multiple second heat exchange tubes is connected to the water inlet end of the heat exchanger, and the water outlet of the heat exchanger constitutes the water outlet end of the heat exchanger assembly. The cooling water enters the water inlet chamber inside the water inlet wall through the water inlet interface, and is then distributed to each water-cooling tube. After absorbing the heat generated by the combustion in the combustion chamber during the flow along the water-cooling tube, it enters the return water chamber, and then enters the first second heat exchange tube, and flows through each second heat exchange tube in turn, and flows out from the last second heat exchange tube into the heat exchanger. During the flow along the second heat exchange tube, it further absorbs heat to increase the water temperature. Finally, during the flow along the heat exchanger, it continues to absorb the heat generated by the combustion, and finally flows out through the water outlet interface. The arrangement of the second heat exchange tube can further absorb heat, so that the water entering the heat exchanger is hot water with a higher temperature, thereby quickly increasing the water temperature and improving efficiency.

[0018] In an optional embodiment, the water inlet wall is provided with at least one third connecting groove, the return water wall is provided with at least one fourth connecting groove, the first end of the second heat exchange tube is connected to the water inlet wall, the second end of the second heat exchange tube is connected to the return water wall, and multiple second heat exchange tubes are connected in sequence 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 water inlet wall, the second end of the second heat exchange tube is connected to the return water wall, and multiple second heat exchange tubes are connected in sequence through the third connecting groove and the fourth connecting groove. Therefore, there is no need to use additional connecting pipes to connect adjacent second heat exchange tubes, the water connection is more convenient, the structure is simpler, and the two ends of the second heat exchange tube are fixed by the water inlet wall and the return water wall, and there is no need to use additional structural parts to fix the second heat exchange tube.

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

[0021] Beneficial effect: The water outlet of the last second heat exchange tube is connected to the water inlet of the heat exchanger through the fifth connecting groove, the structure is simple, and no additional connecting pipe is needed to connect the second heat exchange tube and the heat exchanger.

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

[0023] The return water wall includes a return water outer plate and a return water inner plate, the return water chamber is formed between the return water outer plate and the return water inner plate, and the return water inner plate is provided with a second pipe port;

[0024] Both ends of the heat exchanger assembly and / or the water cooling pipe are connected to the first connecting pipe port and the second connecting pipe port respectively.

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

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

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

[0028] Beneficial effect: The water cooling pipe is arranged on the inner side of the connecting wall, which can better absorb the heat generated by combustion. Moreover, since the water cooling pipe absorbs the heat, the external temperature of the connecting wall is low and the heat loss is less.

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

[0030] Beneficial effects: The inward side of the water-cooling pipe can directly exchange heat with the high-temperature flue gas, and the outward side of the water-cooling pipe can make surface contact with the groove wall of the arc-shaped groove, which can increase the heat exchange area between the water-cooling pipe and the connecting wall, help improve the heat exchange efficiency between the two, and facilitate the positioning and installation of the water-cooling pipe.

[0031] In an optional 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: The area of ​​the water-cooling pipe that absorbs the heat generated by combustion can be increased.

[0033] In an optional embodiment, both ends of the water-cooling pipe extend out of the connecting wall.

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

[0035] In an optional embodiment, the combustion chamber body, and / or the water cooling 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. The corrosion resistance of stainless steel itself can effectively reduce the risk of water pipe leakage.

[0037] In an optional embodiment, the water inlet interface is connected to a water inlet joint, and the water outlet interface is connected to a water outlet joint.

[0038] Beneficial effect: The arrangement of the water inlet joint and the water outlet joint facilitates connection with the water inlet pipe and the water outlet pipe.

[0039] In a second aspect, the present invention further provides a gas water heater, comprising:

[0040] The heat exchange system.

[0041] Beneficial effect: In this gas water heater, cooling water can enter the water inlet chamber inside the water inlet wall through the water inlet interface, and then be distributed to each water cooling pipe. After absorbing the heat generated by combustion in the combustion chamber during the flow along the water cooling pipe, it enters the return water chamber, and then enters the heat exchanger assembly. During the flow along the heat exchanger assembly, it continues to absorb the heat generated by combustion, and finally flows out through the water outlet interface. The arrangement of the water cooling pipe can absorb heat, so that the water entering the heat exchanger assembly is hot water, and then absorbs heat again to become water with a higher temperature, thereby quickly raising the water temperature and improving efficiency. In addition, since multiple water cooling pipes can pass water at the same time, each water cooling pipe extends from the water inlet wall to the water outlet wall, thereby increasing the water channel area of ​​the water cooling pipe and shortening the water flow path of the water cooling pipe, thereby greatly reducing water resistance, avoiding problems such as abnormal water system pressure, slow water output, insufficient water volume, or even dry burning caused by excessive water resistance. In addition, since the heat exchanger assembly is arranged in the combustion chamber body, the heat exchanger assembly and the combustion chamber body form an integrated structure, there is no air leakage problem, and the water channel connection is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 A schematic diagram of a heat exchange system according to an embodiment of the present invention Figure 1 ;

[0044] Figure 2 A schematic diagram of a heat exchange system according to an embodiment of the present invention Figure 2 ;

[0045] Figure 3 An exploded diagram of a heat exchange system according to an embodiment of the present invention;

[0046] Figure 4 This is the exploded view of the water inlet wall;

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

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

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

[0050] Figure 8 This is a schematic diagram of the water cooling pipe being assembled behind the connecting wall;

[0051] Figure 9 This is the main view of the water cooling pipe assembled behind the connecting wall;

[0052] Figure 10 This is a side view of the water cooling pipe assembled behind the connecting wall;

[0053] Figure 11 This is a schematic diagram of the heat exchanger, the second heat exchange tube, the connecting wall, the water cooling tube and the return water wall after being assembled together;

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

[0055] Figure 13 A partially cutaway schematic diagram of a heat exchange system according to an embodiment of the present invention;

[0056] Figure 14 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 when the water inlet joint, water outlet joint and water inlet outer plate are not assembled together;

[0058] Figure 16 This is a schematic diagram of the water inlet joint, water outlet joint and water inlet outer plate assembled together.

[0059] Description of reference numerals:

[0060] 1. Water inlet wall; 101. Water inlet outer plate; 1011. Water inlet interface; 1012. Water outlet interface; 1013. First connecting groove; 1014. Third connecting groove; 1015. First protrusion; 1016. First groove; 1017. First connecting edge; 102. Water inlet inner plate; 1021. First pipe opening; 1022. Second groove; 103. Water inlet chamber; 2. Water return wall; 201. Water return outer plate; 2011. Second connecting groove; 2012. Third connecting groove; 1015. First protrusion; 1016. First groove; 1017. First connecting edge; 102. Water inlet inner plate; 1021. First pipe opening; 1022. Second groove; 103. Water inlet chamber; 2. Water return wall; 201. Water return outer plate; 2011. Second connecting groove; 2012. Third connecting groove Four connecting grooves; 2013, fifth connecting groove; 2014, second convex portion; 2015, third groove; 202, return water inner plate; 2021, second connecting pipe port; 2022, fourth groove; 203, return water chamber; 2031, third cavity section; 2032, fourth cavity section; 3, water-cooling pipe; 4, heat exchanger; 401, fin; 402, first heat exchange pipe; 5, second heat exchange pipe; 6, connecting wall; 601, arc-shaped groove; 7, water inlet joint; 8, water outlet joint. DETAILED DESCRIPTION

[0061] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0062] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. 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 the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0064] In addition, the technical features involved in the different embodiments of the present invention 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 gas combustion is transferred to the heat exchanger flowing through it, thereby heating the cold water.

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

[0067] The following combination Figures 1 to 16 , describing embodiments of the present invention.

[0068] According to an embodiment of the present invention, on the one hand, a heat exchange system is provided, including a combustion chamber body, a water cooling tube 3 and a heat exchanger assembly.

[0069] Among them, the combustion chamber main body includes an inlet wall 1 and a return water wall 2 arranged relatively to each other, the inlet wall 1 is provided with a water inlet interface 1011 and a water inlet chamber 103, the return water wall 2 is provided with a return water chamber 203, and one of the inlet wall 1 and the return water wall 2 is provided with a water outlet interface 1012; there are multiple water cooling pipes 3, and the water cooling pipes 3 are arranged on at least one side of the combustion chamber main body, one end of the water cooling pipe 3 is connected to the water inlet chamber 103, and the other end is connected to the return water chamber 203; the heat exchanger assembly is arranged in the combustion chamber main body, the water inlet end of the heat exchanger assembly is connected to the return water chamber 203, and the water outlet end of the heat exchanger assembly is connected to the water outlet interface 1012.

[0070] In this embodiment, cooling water can enter the water inlet chamber 103 inside the water inlet wall 1 through the water inlet interface 1011, and then be distributed to each water-cooling tube 3. After absorbing the heat generated by the combustion in the combustion chamber while flowing along the water-cooling tube 3, it enters the return water chamber 203, and then enters the heat exchanger assembly. While flowing along the heat exchanger assembly, it continues to absorb the heat generated by the combustion, and finally flows out through the water outlet interface 1012. The setting of the water-cooling tube 3 can absorb heat, so that the water entering the heat exchanger assembly is hot water, and then absorbs heat again to become water with a higher temperature, so that the water temperature can be quickly increased and the efficiency can be improved. In addition, since multiple water-cooling tubes 3 can pass water at the same time, each water-cooling tube 3 extends from the water inlet wall 1 to the water outlet wall, thereby increasing the water path area of ​​the water-cooling tube 3 and shortening the water flow path of the water-cooling tube 3, thereby greatly reducing the water resistance, avoiding problems such as abnormal water system pressure, slow water outlet, insufficient water volume, and even dry burning caused by excessive water resistance. Furthermore, since the heat exchanger assembly is arranged in the combustion chamber body, the heat exchanger assembly and the combustion chamber body form an integrated structure, there is no air leakage problem, and the water connection is more convenient.

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

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

[0073] Specifically in one embodiment, the water outlet interface 1012 is provided on the water inlet wall 1 .

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

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

[0076] Specifically in one embodiment, during assembly, the first heat exchange tube 402 is inserted into the hole of the fin 401, and an expansion tool is used to expand the inner diameter of the first heat exchange tube 402 so that the first heat exchange tube 402 is in close contact with the fin 401, and welding materials are used to tightly weld the first heat exchange tube 402 and the fin 401 together, thereby forming a heat exchanger 4.

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

[0078] In this embodiment, since the cross-section of the first heat exchange tube 402 is elliptical and the short axis of the ellipse is perpendicular to the direction of flue gas flow, the first heat exchange tube 402 has more contact area with the fin 401, can absorb more heat from the fin 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, Figure 6 As shown, the cross section of the first heat exchange tube 402 is circular.

[0081] In one embodiment, the water inlet wall 1 is provided with multiple first connecting grooves 1013, and the return water wall 2 is provided with multiple second connecting grooves 2011. The first end of the first heat exchange tube 402 is connected to the water inlet wall 1, and the second end of the first heat exchange tube 402 is connected to the return water wall 2. Multiple first heat exchange tubes 402 are connected in sequence through the first connecting groove 1013 and the second connecting groove 2011.

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

[0083] Specifically in one embodiment, a first connecting groove 1013 is opposite to a part of a second connecting groove 2011, and another part of the second connecting groove 2011 is opposite to a part of an adjacent first connecting groove 1013. The same first connecting groove 1013 or second connecting groove 2011 is opposite to two adjacent first heat exchange tubes 402 at the same time, so that multiple first heat exchange tubes 402 can be connected in sequence 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 water inlet of the first second heat exchange tube 5 among the plurality of second heat exchange tubes 5 constitutes the water inlet end of the heat exchanger assembly, the last second heat exchange tube 5 among the plurality of second heat exchange tubes 5 is connected to the water inlet of the heat exchanger 4, and the water outlet of the heat exchanger 4 constitutes the water outlet end of the heat exchanger assembly.

[0085] In this embodiment, since the plurality of second heat exchange tubes 5 are located below the heat exchanger 4, the water inlet of the first second heat exchange tube 5 among the plurality of second heat exchange tubes 5 constitutes the water inlet end of the heat exchanger assembly, the last second heat exchange tube 5 among the plurality of second heat exchange tubes 5 is connected to the water inlet end of the heat exchanger 4, and the water outlet end of the heat exchanger 4 constitutes the water outlet end of the heat exchanger assembly. The 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-cooling tube 3. In the process of flowing along the water-cooling tube 3, the cooling water absorbs the heat generated by the combustion in the combustion chamber. After the heat is absorbed, it enters the return water chamber 203, and then enters the first second heat exchange tube 5, and flows through each second heat exchange tube 5 in turn, and flows out from the last second heat exchange tube 5 into the heat exchanger 4. In the process of flowing along the second heat exchange tube 5, it further absorbs heat to increase the water temperature. Finally, in the process of flowing along the heat exchanger 4, it continues to absorb the heat generated by the combustion, and finally flows out through the water outlet interface 1012. The setting of the second heat exchange tube 5 can further absorb heat, so that the water entering the heat exchanger 4 is hot water with a higher temperature, so the water temperature can be quickly increased, and the efficiency is improved.

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

[0087] Specifically in one embodiment, when the fins 401 of the heat exchanger 4 are copper fins 401, the second heat exchange tubes 5 may not be provided due to the high efficiency of the copper fins 401. When the fins 401 of the heat exchanger 4 are stainless steel fins 401, a row of second heat exchange tubes 5 needs to be provided below the heat exchanger 4 due to the relatively low heat exchange efficiency of stainless steel.

[0088] In one embodiment, the water inlet wall 1 is provided with at least one third connecting groove 1014, the return water 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 water inlet wall 1, and the second end of the second heat exchange tube 5 is connected to the return water wall 2, and multiple second heat exchange tubes 5 are connected in sequence 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 water inlet wall 1, and the second end of the second heat exchange tube 5 is connected to the return water wall 2. Multiple second heat exchange tubes 5 are connected in sequence 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. The water connection is more convenient and the structure is simpler. In addition, the two ends of the second heat exchange tube 5 are fixed by the water inlet wall 1 and the return water wall 2, and there is no need to use additional structural parts to fix the second heat exchange tube 5.

[0090] Specifically in one embodiment, a third connecting groove 1014 is opposite to a part of a fourth connecting groove 2012, and another part of the fourth connecting groove 2012 is opposite to a part of an adjacent third connecting groove 1014. The same third connecting groove 1014 or fourth connecting groove 2012 is opposite to two adjacent second heat exchange tubes 5 at the same time, so that multiple second heat exchange tubes 5 can be connected in sequence through the third connecting groove 1014 and the fourth connecting groove 2012.

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

[0092] In this embodiment, the water outlet of the last second heat exchange tube 5 is connected to the water inlet of the heat exchanger 4 through the fifth connecting groove 2013. The structure is simple and no additional connecting pipe is needed to connect the second heat exchange tube 5 and the heat exchanger 4.

[0093] Specifically in one embodiment, the fifth connecting groove 2013 is provided on the return water wall 2 .

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

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

[0096] In one embodiment, both ends of the water cooling pipe 3 are respectively fixed to the first pipe opening 1021 and the second pipe opening 2021. The both ends of the water cooling pipe 3 are fixed to the first pipe opening 1021 and the second pipe opening 2021 by annular welding.

[0097] In one embodiment, the first heat exchange tube 402 of the heat exchanger 4 is fixed at both ends to the first and second pipe openings 1021 and 2021 respectively. The first heat exchange tube 402 is fixed at both ends to the first and second pipe openings 1021 and 2021 by annular welding.

[0098] In one embodiment, both ends of the second heat exchange tube 5 are respectively fixed to the first pipe opening 1021 and the second pipe opening 2021. The two ends of the second heat exchange tube 5 are fixed to the first pipe opening 1021 and the second pipe opening 2021 by annular welding.

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

[0100] During use of the heat exchange system, cooling water can sequentially enter the water-cooling tube 3 through the water inlet interface 1011, the first cavity section, and the second cavity section. The second cavity section is disposed around the outside of the first cavity section. Through this arrangement, the flow area of ​​the water flow hardly changes along the cooling water flow path, thereby reducing water resistance and preventing changes in the flow pattern of the water flow from impacting the water inlet cavity 103, which helps to enhance the ability of the water inlet cavity 103 to withstand water pressure. Because the second cavity section is disposed around the outer circumference of the first cavity section, the water inlet cavity 103 has a larger area. The water in the water inlet cavity 103 can quickly absorb the heat transferred to the water inlet wall 1 by the flame combustion. The flowing water then transfers the absorbed heat to the heat exchanger assembly.

[0101] As a convertible embodiment, in an embodiment not shown in the accompanying drawings, the water inlet chamber 103 includes a water inlet main road and multiple water inlet branches connected in sequence, the water inlet main road is connected to the water inlet interface 1011, and the multiple water inlet branches are connected in parallel to each other and connected between the water inlet main road and the water cooling pipe 3.

[0102] In one embodiment, Figure 4 As shown, the water inlet wall 1 includes an oppositely arranged water inlet outer plate 101 and a water inlet inner plate 102, a water inlet interface 1011 is provided on the water inlet outer plate 101, and the water cooling pipe 3 is connected to the water inlet inner plate 102. A first convex portion 1015 and a first groove 1016 are provided on the water inlet outer plate 101. The first convex portion 1015 protrudes in a direction away from the water inlet inner plate 102, and the first groove 1016 is provided in the middle of the first convex portion 1015 and is recessed in a direction close to the water inlet inner plate 102. A second groove 1022 is provided on the water inlet inner plate 102. The second groove 1022 is provided at a position corresponding to the first groove 1016 and is recessed in a direction away from the water inlet outer plate 101. The first cavity section is provided between the first groove 1016 and the second groove 1022, and the second cavity section is provided between the first convex portion 1015 and the water inlet inner plate 102.

[0103] Through such an arrangement, the cooperation of the first groove 1016, the first protrusion 1015 and the second groove 1022 can not only form the first cavity section and the second cavity section 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 side wall and the second side wall, thereby enhancing the ability of the water inlet wall 1 to resist water flow impact, which helps to extend the service life of the combustion chamber assembly.

[0104] In one embodiment, Figure 4 As shown, the water inlet outer plate 101 is further provided with a first connecting edge 1017 . The first connecting edge 1017 is provided around the first protrusion 1015 for connecting to the water inlet inner plate 102 .

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

[0106] By such a configuration, not only the water inlet outer plate 101 can be connected to the water inlet inner plate 102 , but also the sealing performance of the water inlet chamber 103 can be improved.

[0107] As a convertible implementation, in an embodiment not shown in the drawings, the water inlet outer side plate 101 and the water inlet inner side plate 102 may also be connected by bonding or bolts.

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

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

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

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

[0112] Through such an arrangement, the cooperation of the third groove 2015, the fourth groove 2022 and the second protrusion 2014 can not only form a third cavity section 2031 in the water inlet wall 1, but the curved third groove 2015, the fourth groove 2022 and the second protrusion 2014 can also increase the structural strength of the third side wall and the fourth side wall, thereby enhancing the ability of the return water wall 2 to resist water flow impact, which helps 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 arranged on the inner side of the connecting wall 6 .

[0114] In this embodiment, the water cooling pipe 3 is arranged on the inner side of the connecting wall 6, which can better absorb the heat generated by combustion. Since the water cooling pipe 3 absorbs the heat, the external temperature of the connecting wall 6 is low and the heat loss is less.

[0115] In an embodiment not shown in the figures, when there are a large number of water-cooling tubes 3 and they are sealed and connected in sequence, the water-cooling tubes 3 can constitute the side wall 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 provided in the arc-shaped groove 601 .

[0117] In this embodiment, the inward side of the water-cooling tube 3 can directly exchange heat with the high-temperature flue gas, and the outward side of the water-cooling tube 3 can make surface contact with the groove wall of the arc-shaped groove 601, which can increase the heat exchange area between the water-cooling tube 3 and the connecting wall 6, help improve the heat exchange efficiency between the two, and facilitate the positioning and installation of the water-cooling tube 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-cooling tube 3 for absorbing 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 tube 3, which can maximize the contact area between the connecting wall 6 and the water-cooling tube 3.

[0121] In one embodiment, both ends of the water-cooling tube 3 extend out of the connecting wall 6 .

[0122] In this embodiment, both ends of the water-cooling pipe 3 extend out of the connecting wall 6 , so as to facilitate the connection between the both ends of the water-cooling pipe 3 and the water inlet wall 1 and the water return wall 2 .

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

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

[0125] In the related art, the combustion chamber body of a gas water heater is generally made of copper, and copper water pipes are at risk of corrosion and leakage.

[0126] The combustion chamber body, water-cooling pipe 3, and heat exchanger assembly of the gas water heater of the embodiment of the present invention are made of stainless steel. The corrosion resistance of stainless steel itself can effectively reduce the risk of water pipe leakage. In addition, the use of stainless steel to make water pipes and combustion chamber bodies has the defect of being difficult to shape. The water-cooling pipe 3 of the embodiment of the present application uses multiple straight pipes arranged in parallel to replace a single coil arranged around the outside of the combustion chamber body. The combustion chamber body is connected by the water inlet wall 1, the water return wall 2, and the connecting wall 6. No bending is required during the assembly process, avoiding the rebound and forming resistance of stainless steel during the processing process, thereby overcoming the defect of being difficult to shape caused by making the combustion chamber body and water-cooling pipe 3 of stainless steel.

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

[0128] In this embodiment, the arrangement of the water inlet joint 7 and the water outlet joint 8 facilitates connection with the water inlet pipe and the water outlet pipe.

[0129] Specifically in one embodiment, the water inlet interface 1011 and the water outlet interface 1012 are both arranged on the water inlet outer plate 101, the water inlet joint 7 is inserted into the water inlet interface 1011, and is sealed and connected to the water inlet interface 1011 by welding, and the water outlet joint 8 is inserted into the water outlet interface 1012, and is sealed and connected to the water outlet interface 1012 by welding.

[0130] According to an embodiment of the present invention, on the other hand, a gas water heater is provided, comprising the heat exchange system provided in the above embodiment.

[0131] In this gas water heater, cooling water can enter the water inlet chamber 103 inside the water inlet wall 1 through the water inlet interface 1011, and then be distributed to each water-cooling pipe 3. After absorbing the heat generated by the combustion in the combustion chamber while flowing along the water-cooling pipe 3, it enters the return water chamber 203, and then enters the heat exchanger assembly. While flowing along the heat exchanger assembly, it continues to absorb the heat generated by the combustion, and finally flows out through the water outlet interface 1012. The setting of the water-cooling pipe 3 can absorb heat, so that the water entering the heat exchanger assembly is hot water, and then absorbs heat again to become water with a higher temperature, so that the water temperature can be quickly increased and the efficiency can be improved. In addition, since multiple water-cooling pipes 3 can pass water at the same time, each water-cooling pipe 3 extends from the water inlet wall 1 to the water outlet wall, thereby increasing the water path area of ​​the water-cooling pipe 3 and shortening the water flow path of the water-cooling pipe 3, thereby greatly reducing the water resistance, avoiding problems such as abnormal water system pressure, slow water output, insufficient water volume, and even dry burning caused by excessive water resistance. Furthermore, since the heat exchanger assembly is arranged in the combustion chamber body, the heat exchanger assembly and the combustion chamber body form an integrated structure, there is no air leakage problem, and the water connection is more convenient.

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

Claims

1. A heat exchange system, characterized in that: include: The combustion chamber body comprises a water inlet wall (1) and a water return wall (2) arranged opposite to each other, the water inlet wall (1) being provided with a water inlet interface (1011) and a water inlet chamber (103), the water return wall (2) being provided with a water return chamber (203), and one of the water inlet wall (1) and the water return wall (2) being provided with a water outlet interface (1012); A plurality of water cooling pipes (3) are provided, wherein the water cooling pipes (3) are provided at at least one side of the combustion chamber body, one end of the water cooling pipe (3) is communicated with the water inlet chamber (103), and the other end is communicated with the water return chamber (203); A heat exchanger assembly is arranged in the combustion chamber body, the water inlet end of the heat exchanger assembly is communicated with the return water chamber (203), and the water outlet end of the heat exchanger assembly is communicated with the water outlet interface (1012).

2. The heat exchange system according to claim 1, characterized in that: The heat exchanger assembly comprises a heat exchanger (4), wherein the heat exchanger (4) comprises 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 cross section of the first heat exchange tube (402) is elliptical, and the short axis of the ellipse is perpendicular to the flow direction of the flue gas.

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

5. The heat exchange system according to claim 2, characterized in that: The heat exchanger assembly further comprises a plurality of second heat exchange tubes (5) connected in sequence, the plurality of second heat exchange tubes (5) being located below the heat exchanger (4), the water inlet of the first second heat exchange tube (5) among the plurality of second heat exchange tubes (5) constituting the water inlet end of the heat exchanger assembly, the last second heat exchange tube (5) among the plurality of second heat exchange tubes (5) being connected to the water inlet end of the heat exchanger (4), and the water outlet end of the heat exchanger (4) constituting the water outlet end of the heat exchanger assembly.

6. The heat exchange system according to claim 5, characterized in that: The water inlet wall (1) is provided with at least one third connecting groove (1014), the water 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 water inlet wall (1), the second end of the second heat exchange tube (5) is connected to the water return wall (2), and a plurality of the second heat exchange tubes (5) are connected in sequence 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 water inlet wall (1) and the water return wall (2) is further provided with a fifth connecting groove (2013), and the fifth connecting groove (2013) is arranged at an angle so that the water outlet of the last second heat exchange tube (5) is connected to the water 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) comprises a water inlet outer plate (101) and a water inlet inner plate (102), wherein the water inlet chamber (103) is formed between the water inlet outer plate (101) and the water inlet inner plate (102), and the water inlet inner plate (102) is provided with a first pipe opening (1021); The return water wall (2) comprises a return water outer plate (201) and a return water inner plate (202), the return water chamber (203) is formed between the return water outer plate (201) and the return water inner plate (202), and the return water inner plate (202) is provided with a second pipe connection port (2021); Both ends of the heat exchanger assembly and / or the water-cooling pipe (3) are respectively connected to the first connecting pipe port (1021) and the second connecting pipe port (2021).

9. The heat exchange system according to any one of claims 1 to 7, characterized in that: The combustion chamber body further comprises: A connecting wall (6) is connected between the water inlet wall (1) and the water return wall (2). Two connecting walls (6) are provided and are arranged opposite to each other. The water cooling pipe (3) is arranged 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 arranged 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: Both ends of the water cooling 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 cooling 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 interface (1011) is connected to a water inlet joint (7), and the water outlet interface (1012) is connected to a water outlet joint (8).

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

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