Heat exchanger and gas water heater

Abstract

The utility model discloses a heat exchanger and gas water heater relates to water heater technical field. Among them, the heat exchanger includes the casing, a plurality of heat exchange pipes, a plurality of first water box, two groups of cooling flow channel group and two second water box. The casing includes the first side wall, the second side wall, the third side wall and the fourth side wall, a plurality of heat exchange pipes are arranged in the heat exchange room, and the both ends of heat exchange pipe are respectively worn in the third side wall and the fourth side wall, every adjacent two heat exchange pipes are communicated through a first water box, and the heat exchange flow channel is equipped with the water inlet, two groups of cooling flow channel group are respectively arranged in the first side wall and the second side wall, and two second water boxes are respectively arranged in the third side wall and the fourth side wall, one second water box communicates two groups of cooling flow channel group, and the other second water box is equipped with the water outlet, the height size h1 of first water box in the second direction, the height size h2 of second water box in the second direction satisfy: h1>h2. The utility model technical scheme can reduce the local resistance loss in heat exchanger, and promote the heat exchange efficiency.

Description

Technical Field

[0001] This utility model relates to the field of water heater technology, and in particular to a heat exchanger and a gas water heater. Background Technology

[0002] A gas water heater is a device that uses gas as fuel and heats cold water flowing through a heat exchanger to produce hot water.

[0003] In related technologies, the large local resistance at the bends connecting heat exchange tubes in heat exchangers leads to low heat exchange efficiency. Utility Model Content

[0004] The main purpose of this invention is to propose a heat exchanger that aims to reduce local resistance and improve heat exchange efficiency.

[0005] To achieve the above objectives, the heat exchanger proposed in this utility model includes:

[0006] The shell includes a first sidewall and a second sidewall opposite to each other along a first direction, and a third sidewall and a fourth sidewall opposite to each other along a second direction. The first sidewall, the fourth sidewall, the second sidewall, and the third sidewall are connected end to end to enclose a heat exchange chamber that is open at both ends in a third direction. The first direction, the second direction, and the third direction intersect each other.

[0007] Multiple heat exchange tubes are disposed in the heat exchange chamber, and the two ends of the heat exchange tubes extend along the second direction to pass through the third side wall and the fourth side wall respectively;

[0008] Multiple first water boxes are respectively disposed on the third side wall and the fourth side wall; each pair of adjacent heat exchange tubes are connected through a first water box, so that multiple heat exchange tubes are connected in series to form a heat exchange channel, and the heat exchange channel is provided with a water inlet;

[0009] Two sets of cooling channels are respectively disposed on the first sidewall and the second sidewall, and are connected to the heat exchange channels; and

[0010] Two second water boxes are respectively located on the third side wall and the fourth side wall; one of the second water boxes connects the two sets of cooling channel groups, and the other second water box is provided with a water outlet;

[0011] Wherein, the height dimension h1 of the first water box in the second direction and the height dimension h2 of the second water box in the second direction satisfy: h1>h2.

[0012] In one embodiment of this application, the height dimension h1 of the first water box in the second direction and the height dimension h2 of the second water box in the second direction satisfy: h1<3h2.

[0013] In one embodiment of this application, multiple first water boxes on the same sidewall are arranged independently of each other.

[0014] In one embodiment of this application, the first water box includes:

[0015] The first bottom shell has two first mounting holes, and two adjacent heat exchange tubes are respectively inserted into the two first mounting holes; and

[0016] The first cover is placed on the side of the first bottom shell away from the shell and forms a first flow cavity with the first bottom shell. The two adjacent heat exchange tubes are connected to the first flow cavity.

[0017] In one embodiment of this application, the first cover shell is welded and fixed to the first bottom shell.

[0018] In one embodiment of this application, the heat exchange tube is welded and fixed to the periphery of the corresponding first mounting hole;

[0019] And / or, the first bottom shell is welded and fixed to the corresponding third sidewall or the fourth sidewall.

[0020] In one embodiment of this application, the second water box extends along a first direction and is disposed on the corresponding third and fourth sidewalls.

[0021] In one embodiment of this application, the heat exchanger further includes two mounting plates disposed outside the third and fourth side walls, the mounting plates protruding outward in a direction away from the shell to form the second water box;

[0022] The first water box is located on the outside of the mounting plate, and the mounting plate has multiple first through holes for the heat exchange tubes to pass through.

[0023] In one embodiment of this application, each group of cooling channels includes at least two cooling pipes arranged in parallel along a third direction;

[0024] The heat exchanger also includes a third water box disposed on the third side wall or the fourth side wall, the third water box connecting the cooling channel assembly on the first side wall to one end of the heat exchange channel.

[0025] In one embodiment of this application, the third water box is set independently of the first water box.

[0026] In one embodiment of this application, the third water box includes:

[0027] The third bottom shell has a second mounting hole and at least two third mounting holes, the second mounting hole for mounting the corresponding heat exchange tube, and the at least two third mounting holes for mounting the corresponding cooling tube; and

[0028] The third cover is installed on the side of the third bottom shell away from the shell and forms a third flow cavity with the third bottom shell. The corresponding heat exchange tube and at least two cooling tubes are all in communication with the third flow cavity.

[0029] In one embodiment of this application, the third cover shell is welded and fixed to the third bottom shell.

[0030] In one embodiment of this application, the periphery of the second mounting hole is welded and fixed to the corresponding heat exchange tube, and the cooling tube is welded and fixed to the periphery of the corresponding third mounting hole;

[0031] And / or, the third bottom shell is welded and fixed to the first sidewall.

[0032] In one embodiment of this application, the height dimension h3 of the third water box in the second direction satisfies: h2 <h3<3h2。

[0033] In one embodiment of this application, the third water box extends along a third direction.

[0034] In one embodiment of this application, the water inlet and the water outlet are located on the same side of the housing.

[0035] In one embodiment of this application, the third direction is the vertical direction of the housing, and in the third direction, the water outlet is located on the upper edge of the second water box.

[0036] The upper edge of the second water box with the outlet is higher than the upper edge of the second water box opposite.

[0037] In one embodiment of this application, in a third-party direction, the upper surface of the water outlet is higher than the upper surface of the cooling channel assembly.

[0038] In one embodiment of this application, the cooling channel group includes a first cooling pipe, a second cooling pipe, and a third cooling pipe arranged sequentially along a third direction, wherein the cross-sectional area of ​​the first cooling pipe and / or the second cooling pipe is smaller than the cross-sectional area of ​​the third cooling pipe.

[0039] In one embodiment of this application, the flow cross-sectional shape of the first cooling pipe is circular;

[0040] And / or, the flow cross-sectional shape of the second cooling pipe is circular;

[0041] And / or, the cross-sectional shape of the third cooling pipe is elliptical.

[0042] In one embodiment of this application, the distance between the first cooling pipe and the second cooling pipe is greater than the distance between the second cooling pipe and the third cooling pipe.

[0043] To achieve the above objectives, this application also provides a gas water heater, including the heat exchanger described above.

[0044] In this utility model's heat exchanger, a heat exchange chamber is formed inside the shell. Multiple heat exchange tubes extending along a second direction and penetrating the third and fourth side walls are arranged within the heat exchange chamber. Multiple first water boxes are arranged on the third and fourth side walls. Each pair of adjacent heat exchange tubes is connected through a first water box, allowing the multiple heat exchange tubes to be connected in series to form a heat exchange channel. Simultaneously, cooling channel groups are arranged on the first and second side walls, and second water boxes are arranged on the third and fourth side walls. This allows water entering from the inlet to sequentially flow through the heat exchange channel, a cooling channel group, a second water box, another cooling channel group, and another second water box before flowing out from the outlet, achieving the function of preparing hot water while preventing the shell wall temperature from becoming too high. By setting the height dimension h1 of the first water box in the second direction to be greater than the height dimension h2 of the second water box in the second direction, the height dimension of the first water box in the second direction is increased. When the projected area of ​​the first water box on its side wall is the same, the volume of the first water box is increased, which reduces the flow velocity at the first water box, thereby reducing the local resistance at the first water box and improving the overall heat exchange efficiency of the heat exchanger. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the heat exchanger of this utility model from one perspective;

[0047] Figure 2 for Figure 1 A schematic diagram of the structure after the first water box and the third water box are hidden in the embodiment;

[0048] Figure 3 This is a structural schematic diagram of the heat exchanger of this utility model from another perspective;

[0049] Figure 4 This is a schematic diagram of the structure of the first water box in an embodiment of this utility model;

[0050] Figure 5 for Figure 4 Another perspective view of the embodiment;

[0051] Figure 6 This is a schematic diagram of the structure of the third water box in an embodiment of this utility model;

[0052] Figure 7 This is a schematic diagram of the structure of the mounting plate on the third side wall in an embodiment of this utility model;

[0053] Figure 8 This is a schematic diagram of the structure of the mounting plate on the fourth side wall in an embodiment of this utility model;

[0054] Figure 9 This is a cross-sectional view of the heat exchanger of this utility model.

[0055] Explanation of icon numbers:

[0056]

[0057]

[0058] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0059] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0060] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0061] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0062] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0063] This utility model proposes a heat exchanger. The aim is to improve heat exchange efficiency by increasing the volume of the water box connecting adjacent heat exchange tubes and their bends, thereby reducing local resistance at these bends. It is understood that this heat exchanger can be applied to both fully premixed combustion gas water heaters and atmospheric combustion gas water heaters. For ease of understanding, the following explanation uses an application of the heat exchanger in a fully premixed combustion gas water heater as an example.

[0064] In the embodiments of this utility model, such as Figures 1 to 5 As shown, the heat exchanger includes a shell 100, multiple heat exchange tubes 200, multiple first water boxes 310, two sets of cooling channel groups (401 / 402 / 403) and two second water boxes 320.

[0065] The housing 100 includes a first sidewall 110 and a second sidewall 120 opposite to each other along a first direction, and a third sidewall 130 and a fourth sidewall 140 opposite to each other along a second direction. The first sidewall 110, the fourth sidewall 140, the second sidewall 120, and the third sidewall 130 are connected end to end to form a heat exchange chamber B that is open at both ends in a third direction. The first direction, the second direction, and the third direction intersect each other. A plurality of heat exchange tubes 200 are disposed in the heat exchange chamber B, and the two ends of the heat exchange tubes 200 extend along the second direction to pass through the third sidewall 130 and the fourth sidewall 140 respectively. A plurality of first water boxes 310 are respectively disposed in the third sidewall 130 and the fourth sidewall 140. Each pair of adjacent heat exchange tubes 200 passes through a first water box. 310 is connected so that multiple heat exchange tubes 200 are connected in series to form a heat exchange channel 201, and the heat exchange channel 201 is provided with a water inlet 501; two sets of cooling channel groups (401 / 402 / 403) are respectively provided on the first side wall 110 and the second side wall 120, and are connected to the heat exchange channel 201; two second water boxes 320 are respectively provided on the third side wall 130 and the fourth side wall 140; one of the second water boxes 320 connects the two sets of cooling channel groups (401 / 402 / 403), and the other second water box 320 is provided with a water outlet 502; the height dimension h1 of the first water box 310 in the second direction and the height dimension h2 of the second water box 320 in the second direction satisfy: h1>h2.

[0066] It is understandable that the first direction, the second direction, and the third direction can be determined according to the actual situation and are not limited to a specific combination of directions. For ease of explanation, this specification uses the first direction as the front-back direction of the housing 100, the second direction as the left-right direction of the housing 100, and the third direction as the up-down direction of the housing 100.

[0067] The shell 100 includes a first sidewall 110, a fourth sidewall 140, a second sidewall 120, and a third sidewall 130 connected end-to-end. It is understood that the first sidewall 110 and the second sidewall 120 are the front and rear sidewalls, respectively, and the third sidewall 130 and the fourth sidewall 140 are the left and right sidewalls, respectively. Optionally, the shell 100 has a cross-section that is approximately "U"-shaped, with the combustion component 600 installed at the upper opening, and the heat exchange tube 200 located near the lower opening of the shell 100. The first sidewall 110, the fourth sidewall 140, the second sidewall 120, and the third sidewall 130 can be four independent side plate structures, fixed together by welding or riveting; alternatively, the four sidewalls can be a one-piece molded structure, such as formed by bending sheet metal. In this embodiment, considering the installation of internal components such as heat exchange components and cooling pipes, it is preferable that the four sidewalls are independently molded before assembly and fixation. A heat exchange chamber B is formed inside the shell 100. The mixture of gas and air can be ignited in the heat exchange chamber B, or high-temperature flue gas from the outside can flow into the heat exchange chamber B. The high-temperature flue gas can exchange heat with the heat exchange channel 201, the two sets of cooling channels (401 / 402 / 403) and each water box to achieve the function of preparing hot water.

[0068] Multiple heat exchange tubes 200 are disposed within heat exchange chamber B and extend along a second direction to pass through the third side wall 130 and the fourth side wall 140 respectively. Each pair of adjacent heat exchange tubes 200 is connected through a first water box 310, so that the multiple heat exchange tubes 200 are connected in series to form a heat exchange channel 201. Optionally, the multiple heat exchange tubes 200 are arranged at intervals along the first direction, and the high-temperature flue gas in heat exchange chamber B can pass through the gaps between adjacent heat exchange tubes 200 for heat exchange.

[0069] Cooling channel groups (401 / 402 / 403) are respectively provided on the first side wall 110 and the second side wall 120, and the cooling channel groups (401 / 402 / 403) are connected to the heat exchange channel 201. At the same time, two second water boxes 320 are respectively provided on the third side wall 130 and the fourth side wall 140. One of the second water boxes 320 connects the two cooling channel groups (401 / 402 / 403), and the other second water box 320 is provided with an outlet 502, so that the water entering from the inlet 501 will flow through the heat exchange channel 201, one cooling channel group (401 / 402 / 403), one second water box 320, another cooling channel group (401 / 402 / 403), and another second water box 320 in sequence for heat exchange and then flow out from the outlet 502. This configuration ensures that water flows over each side wall of the casing 100, which effectively reduces the temperature of each wall surface of the casing 100, while also improving heat utilization and accelerating heat exchange efficiency.

[0070] Understandably, in this embodiment, the first water box 310 is used to connect two adjacent heat exchange tubes 200 in series. The connection method between the first water box 310 and its side wall can be determined according to the actual situation. For example, the first water box 310 can be a box structure independent of the side wall. In this case, the height dimension h1 of the first water box 310 in the second direction can be understood as the height dimension of the first water box 310 itself in the second direction; or the first water box 310 can be a convex structure formed by the outward protrusion of the side wall. In this case, the height dimension h1 of the first water box 310 in the second direction can be understood as the height dimension of the first water box 310 protruding from its side wall in the second direction. The second water box 320 is used to connect the two sets of cooling channel groups (401 / 402 / 403) in series or to connect the cooling channel groups (401 / 402 / 403) to the outlet 502. The two sets of cooling channel groups (401 / 402 / 403) are located on the opposite first side wall 110 and second side wall 120 respectively. The second water box 320 can cover the third side wall 130 and the fourth side wall 140 in the front-back direction. The height dimension of the second water box 320 in the second direction is h2, which can be understood as the height dimension of the second water box 320 protruding from its side wall in the second direction.

[0071] By setting the height dimensions of both water tanks to satisfy h1>h2, compared to the related art where the first water tank 310 and the second water tank 320 use the same height dimension, this embodiment increases the height dimension of the first water tank 310 in the second direction. Therefore, given a fixed projected area of ​​the first water tank 310 on its sidewall, this embodiment can increase the volume of the first water tank 310, thereby reducing the flow velocity at the first water tank 310. According to the local resistance formula... It can be seen that when the flow rate decreases, the local resistance decreases. Therefore, this embodiment can effectively reduce the local resistance at the first water box 310 and improve the overall heat exchange efficiency of the heat exchanger.

[0072] Optionally, during manufacturing, multiple first water boxes 310 are manufactured independently, and then each first water box 310 is installed onto the housing 100. This ensures that the height h1 of the first water box 310 is higher than the height of multiple water boxes manufactured as a single piece, effectively reducing local resistance at the connection between adjacent heat exchange tubes 200. Optionally, the height h1 of the first water box 310 is not less than 12mm.

[0073] In summary, in the heat exchanger of this utility model, a heat exchange chamber B is formed inside the shell 100. Multiple heat exchange tubes 200 extending along the second direction and passing through the third side wall 130 and the fourth side wall 140 are arranged in the heat exchange chamber B. Multiple first water boxes 310 are arranged on the third side wall 130 and the fourth side wall 140. Each pair of adjacent heat exchange tubes 200 is connected through a first water box 310, so that the multiple heat exchange tubes 200 are connected in series to form a heat exchange channel 201. Meanwhile, cooling fans are respectively provided on the first side wall 110 and the second side wall 120. The flow channel group (401 / 402 / 403) has a second water box 320 respectively installed on the third side wall 130 and the fourth side wall 140. This allows water entering from the inlet 501 to flow sequentially through the heat exchange channel 201, a set of cooling flow channel groups (401 / 402 / 403), a second water box 320, another set of cooling flow channel groups (401 / 402 / 403), and another second water box 320 before flowing out from the outlet 502. This achieves the function of preparing hot water while preventing the wall temperature of the shell 100 from becoming too high. By setting the height dimension h1 of the first water box 310 in the second direction to be greater than the height dimension h2 of the second water box 320 in the second direction, the height dimension of the first water box 310 in the second direction is increased. When the projected area of ​​the first water box 310 on its side wall is the same, the volume of the first water box 310 is increased, which reduces the flow velocity at the first water box 310, thereby reducing the local resistance at the first water box 310 and improving the overall heat exchange efficiency of the heat exchanger.

[0074] In one embodiment of this application, as Figures 1 to 5 The height dimension h1 of the first water box 310 in the second direction and the height dimension h2 of the second water box 320 in the second direction satisfy: h1<3h2.

[0075] Understandably, the height h1 of the first water box 310 in the second direction should not be too high. If it is too high, the width of the heat exchanger in the second direction will be too wide, resulting in excessive space occupation when installed in the water heater. Based on this, in this embodiment, the height h1 of the first water box 310 in the second direction is set to satisfy h1 < 3h2. This setting can reduce local resistance loss while avoiding an excessively large overall structure of the heat exchanger.

[0076] In one embodiment of this application, as Figures 1 to 5 Multiple first water boxes 310 on the same side wall are set independently of each other.

[0077] In this embodiment, each first water box 310 can be manufactured and formed separately before being assembled onto the third side wall 130 and the fourth side wall 140. This design ensures that the height of the first water box 310 in the second direction is higher than that of a conventional water box formed by stamping multiple water boxes in one piece, effectively reducing local resistance loss.

[0078] Alternatively, the first water box 310 may be manufactured by stamping a single sheet, casting, or machining.

[0079] Specifically, such as Figure 4 The first water box 310 includes a first bottom shell 311 and a first cover shell 312. The first bottom shell 311 is provided with two first mounting holes 3111, and two adjacent heat exchange tubes 200 are respectively inserted into the two first mounting holes 3111. The first cover shell 312 covers the side of the first bottom shell 311 away from the shell 100 and forms a first flow cavity with the first bottom shell 311. Two adjacent heat exchange tubes 200 are connected to the first flow cavity.

[0080] This embodiment describes the structure of the first water box 310. A first bottom shell 311 and a first cover shell 312 enclose a first flow cavity. The first bottom shell 311 has two first mounting holes 3111, and two heat exchange tubes 200 are respectively inserted into the two first mounting holes 3111, allowing the first flow cavity to connect two adjacent heat exchange tubes 200 in series. Optionally, the first cover shell 312 is welded to the first bottom shell 311 to ensure the structural reliability of the first water box 310 while improving the sealing of the first flow cavity to prevent leakage.

[0081] It should be noted that in this embodiment, the first water box 310 is a structure independent of the housing 100, and two heat exchange tubes 200 extend from the third side wall 130 or the fourth side wall 140 to connect with the first water box 310. Optionally, the heat exchange tubes 200 are welded and fixed to the periphery of the corresponding first mounting holes 3111 to ensure the installation seal between the heat exchange tubes 200 and the first bottom shell 311. Optionally, the first bottom shell 311 is welded and fixed to the corresponding third side wall 130 or the fourth side wall 140 to improve the connection reliability between the first water box 310 and the housing 100.

[0082] In one embodiment of this application, as Figures 1 to 3 as well as Figure 7 and Figure 8 The second water box 320 extends along the first direction and is disposed on the corresponding third side wall 130 and fourth side wall 140. This design can increase the area of ​​the second water box 320 covering the corresponding side wall, increase the heat exchange area with the wall of the shell 100, and further accelerate the efficiency of cooling the wall of the shell 100.

[0083] Understandably, since the second water box 320 covers a large area of ​​the third sidewall 130 and the fourth sidewall 140, and due to the high water pressure, the second water box 320 may deform or even be damaged. Therefore, in one embodiment, the outer sidewall of the second water box 320 is provided with a reinforcing recess 322 recessed towards its corresponding sidewall to increase the structural strength of the second water box 320. Optionally, the reinforcing recess 322 of the second water box 320 can be recessed to fit snugly against its corresponding sidewall and fixed by welding.

[0084] In one embodiment of this application, as Figures 1 to 3 as well as Figure 7 and Figure 8 The heat exchanger also includes two mounting plates 321 located outside the third side wall 130 and the fourth side wall 140. The mounting plates 321 protrude outward in the direction away from the shell 100 to form a second water box 320. The first water box 310 is located outside the mounting plate 321. The mounting plate 321 has a plurality of first through holes 3211 through which the heat exchange tubes 200 pass.

[0085] In this embodiment, by providing an mounting plate 321 on the outer side of the third sidewall 130 and the fourth sidewall 140, a second water box 320 can be formed by protruding outward from the mounting plate 321, ensuring the integrity of the third sidewall 130 and the fourth sidewall 140, improving the sealing of the heat exchange chamber B, and preventing the leakage of high-temperature flue gas. The first water box 310 is located on the outer side of the mounting plate 321. Optionally, the first bottom shell 311 of the first water box 310 is welded and fixed to the mounting plate 321, and the heat exchange tube 200 passes through the first through hole 3211 on the mounting plate 321 into the first water box 310. Optionally, the heat exchange tube 200 is welded and sealed to the periphery of the first through hole 3211.

[0086] In one embodiment of this application, as Figures 1 to 3 as well as Figure 9 Each cooling channel group (401 / 402 / 403) includes at least two cooling pipes arranged in parallel along a third direction.

[0087] In this embodiment, each cooling channel group (401 / 402 / 403) includes at least two cooling pipes arranged in parallel along a third direction. That is, the at least two cooling pipes are arranged in parallel with the side wall of the heat exchange chamber B along the flue gas flow direction. Compared with using only a single cooling pipe, this design increases the heat exchange area of ​​the cooling pipes and accelerates the cooling speed of the side wall surface of the shell 100. With at least two cooling pipes arranged in parallel, the inlets and outlets of the at least two cooling pipes are connected to each other. The water entering the at least two cooling pipes from the inlets is at a lower temperature. Compared with the series connection, this increases the temperature difference between the water in the cooling pipes and the heat exchange chamber B, resulting in higher heat exchange efficiency. Furthermore, while obtaining the same heat exchange area on the wall as in the series connection, it can increase the flow cross-sectional area, reduce water flow resistance, and increase the flow rate.

[0088] Furthermore, such as Figures 1 to 3 as well as Figure 6 The heat exchanger also includes a third water box 330 disposed on the third side wall 130 or the fourth side wall 140, the third water box 330 connecting the cooling channel assembly (401 / 402 / 403) on the first side wall 110 to one end of the heat exchange channel 201.

[0089] The third water box 330 serves to connect the heat exchange channel 201 with at least two cooling pipes on the first side wall 110. In other words, the third water box 330 acts as a transition water box between series and parallel pipes, allowing water flowing out of the heat exchange channel 201 to be evenly distributed in the third water box 330 before simultaneously entering the at least two parallel cooling pipes. This reduces water flow resistance and achieves better flow distribution. Specifically, cold water enters from the inlet 501, flows sequentially through the heat exchange channel 201, the third water box 330, the cooling channel group (401 / 402 / 403) on the first side wall 110, the second water box 320 on the fourth side wall 140, the cooling channel group (401 / 402 / 403) on the second side wall 120, and the second water box 320 on the third side wall 130, and then flows out from the outlet 502.

[0090] Furthermore, such as Figure 1 , Figure 2 , Figures 4 to 6 The third water box 330 and the first water box 310 are independently configured. In this embodiment, the third water box 330 and the first water box 310 are manufactured and formed separately before being assembled onto the third side wall 130 or the fourth side wall 140. This design ensures that the height of the first water box 310 and the third water box 330 in the second direction is higher than the height of a conventional water box formed by stamping multiple water boxes in one piece, which can effectively reduce local resistance and improve heat exchange efficiency.

[0091] Alternatively, the third water box 330 can be manufactured by stamping a single sheet, casting, or machining.

[0092] Specifically, such as Figure 6 The third water box 330 includes a third bottom shell 331 and a third cover shell 332. The third bottom shell 331 has a second mounting hole 3311 and at least two third mounting holes 3312. The second mounting hole 3311 is for mounting the corresponding heat exchange tube 200, and the at least two third mounting holes 3312 are for mounting the corresponding cooling tubes. The third cover shell 332 covers the side of the third bottom shell 331 away from the shell 100 and forms a third flow cavity with the third bottom shell 331. The corresponding heat exchange tube 200 and at least two cooling tubes are all connected to the third flow cavity.

[0093] This embodiment describes the structure of the third water box 330. The third bottom shell 331 and the third cover shell 332 enclose a third flow cavity. The third bottom shell 331 has a second mounting hole 3311 and at least two third mounting holes 3312. The heat exchange tube 200 at the end passes through the second mounting hole 3311, and at least two cooling tubes are respectively inserted into the at least two third mounting holes 3312, so that the third flow cavity can connect the heat exchange channel 201 with the at least two cooling tubes. It can be understood that the water flowing from the heat exchange tube 200 can be mixed in the third flow cavity before entering the at least two cooling tubes. By independently molding the third water box 330, the height dimension of the third water box 330 in the second direction can be increased, the volume of the third water box 330 can be increased, and local resistance can be further reduced.

[0094] Optionally, the third cover 332 is welded and fixed to the third bottom cover 331, which ensures the structural reliability of the third water box 330 while improving the sealing performance of the third flow cavity to prevent water leakage.

[0095] It should be noted that in this embodiment, the third water box 330 is a structure independent of the housing 100. The heat exchange tube 200 and at least two cooling tubes extend from the third side wall 130 or the fourth side wall 140 to connect with the third water box 330. Optionally, the heat exchange tube 200 is welded and fixed to the periphery of the corresponding second mounting hole 3311 to ensure the installation seal between the heat exchange tube 200 and the third bottom shell 331. The cooling tube is welded and fixed to the periphery of the corresponding third mounting hole 3312 to ensure the installation seal between the cooling tube and the third bottom shell 331. Optionally, the third bottom shell 331 is welded and fixed to the first side wall 110 to improve the connection reliability between the third water box 330 and the housing 100.

[0096] Furthermore, such as Figure 2 and Figure 6 The height dimension h3 of the third water box 330 in the second direction satisfies: h2 <h3<3h2。

[0097] By setting the height h3 of the third water box 330 in the second direction to be greater than the height h2 of the second water box 320 in the second direction, compared with the related technology in which the third water box 330 and the second water box 320 adopt the same height dimension, this embodiment increases the height dimension of the third water box 330 in the second direction. Therefore, when the projected area of ​​the third water box 330 on its side wall is constant, this embodiment can increase the volume of the third water box 330, thereby reducing the flow velocity at the third water box 330, reducing the local resistance at the third water box 330, and improving the overall heat exchange efficiency of the heat exchanger.

[0098] Meanwhile, the height h3 of the third water box 330 in the second direction should not be too high. If it is too high, the width of the heat exchanger in the second direction will be too wide, resulting in excessive space occupation when installed in the water heater. Based on this, in this embodiment, the height h3 of the third water box 330 in the second direction is set to satisfy h3 < 3h2. This setting can reduce local resistance loss while avoiding an excessively large overall structure of the heat exchanger.

[0099] As an example, the height dimension h3 of the third water box 330 in the second direction can be equal to the height dimension h1 of the first water box 310 in the second direction. This design facilitates molding and manufacturing, and simplifies the complexity of the process.

[0100] Furthermore, such as Figure 1 The third water box 330 extends along the third direction. This design allows the third water box 330 to cover all the cooling pipes arranged in parallel along the third direction, ensuring that the amount of water entering at least two cooling pipes. On the other hand, it increases the coverage area of ​​the third water box 330 on the third side wall 130, increases the heat exchange area with the wall of the shell 100, and further accelerates the cooling efficiency of the wall of the shell 100.

[0101] In one embodiment of this application, as Figure 1 and Figure 2 The inlet 501 and outlet 502 are located on the same side of the housing 100. This design makes it easier to connect external pipelines. Alternatively, both the inlet 501 and outlet 502 can be located on this side of the third sidewall 130.

[0102] Furthermore, in the third direction, the water outlet 502 is located on the upper edge of the second water box 320 to which it is located; the upper edge of the second water box 320 with the water outlet 502 is higher than the upper edge of the opposite second water box 320.

[0103] This design allows water to enter from a low position and exit from a high position, making the outlet 502 relatively high. This ensures that the pipes through which the water flows are filled with water, thus preventing the upper cooling pipes from being incompletely filled and causing severe vaporization noise under low flow conditions.

[0104] Furthermore, on a third-order upward, the upper surface of the outlet 502 is higher than the upper surface of the cooling channel assembly (401 / 402 / 403). This design prevents the upper cooling pipe from being insufficiently filled under low flow conditions, thus avoiding severe vaporization noise. Optionally, the center horizontal line of the outlet 502 is aligned with the center horizontal line of the uppermost first cooling pipe 401 in the cooling channel assembly, and the diameter of the outlet 502 is larger than the inner diameter of the first cooling pipe 401.

[0105] In one embodiment of this application, as Figure 1 To the diagram and Figure 9 The cooling channel assembly (401 / 402 / 403) includes a first cooling pipe 401, a second cooling pipe 402 and a third cooling pipe 403 arranged sequentially along a third direction. The cross-sectional area of ​​the first cooling pipe 401 and / or the second cooling pipe 402 is smaller than the cross-sectional area of ​​the third cooling pipe 403.

[0106] Understandably, along the flue gas flow path, the downstream temperature is lower than the upstream temperature. Therefore, the flue gas temperature at the locations of the first cooling pipe 401 and the second cooling pipe 402 will be higher than the flue gas temperature at the location of the third cooling pipe 403. Because of the higher temperature at the locations of the first and second cooling pipes 401 and 402, there is a risk of high-temperature vaporization inside the pipes due to localized high temperatures on the pipe walls. Therefore, in this embodiment, the flow cross-sectional area of ​​the first cooling pipe 401 and / or the second cooling pipe 402 is set to be smaller than that of the third cooling pipe 403. This results in a relatively smaller heat exchange area between the first and second cooling pipes 401 and the high-temperature flue gas, reducing the risk of high-temperature vaporization. Simultaneously, since the third cooling pipe 403 is located in a relatively low-temperature flue gas region, its flow cross-sectional area is set to be relatively larger, increasing the heat exchange area between the third cooling pipe 403 and the flue gas to maximize heat utilization. This achieves the function of utilizing the high-temperature flue gas temperature in stages, improving the overall heat exchange efficiency of the heat exchanger.

[0107] The flow cross-sectional area of ​​the first cooling pipe 401 and / or the second cooling pipe 402 is smaller than the flow cross-sectional area of ​​the third cooling pipe 403. This can be understood as follows: only the flow cross-sectional area of ​​the first cooling pipe 401 is smaller than the flow cross-sectional area of ​​the third cooling pipe 403; or only the flow cross-sectional area of ​​the second cooling pipe 402 is smaller than the flow cross-sectional area of ​​the third cooling pipe 403; or both the flow cross-sectional areas of the first cooling pipe 401 and the second cooling pipe 402 are smaller than the flow cross-sectional area of ​​the third cooling pipe 403. It should be noted that the flow cross-sectional areas of the first cooling pipe 401 and the second cooling pipe 402 can be the same or different. In some embodiments, it is possible to choose that both have the same flow cross-sectional area, so that the water flow distribution of the cooling pipes on the sidewall of the housing 100 is more uniform, preventing the smaller cooling pipe from easily vaporizing at high temperatures due to uneven flow.

[0108] Furthermore, in practical applications, the number of cooling pipes is not limited to three as in the above embodiment; it can also be two, four, or more. In this embodiment, considering that setting two pipes may result in insufficient combustion distance, which could easily cause the flame to bake the fins in the heat exchange component; and setting four or more pipes may result in excessive combustion distance, which could affect heat exchange efficiency, this embodiment preferably sets three cooling pipes side by side.

[0109] Specifically, during manufacturing, the three cooling pipes and the shell 100 can be manufactured separately first, and then the three pipes can be assembled into the inner side wall of the heat exchange chamber B and fixed by welding.

[0110] Optionally, the flow cross-sectional shape of the first cooling pipe 401 is circular;

[0111] Optionally, the flow cross-sectional shape of the second cooling pipe 402 is circular;

[0112] Optionally, the cross-sectional shape of the third cooling pipe 403 is elliptical.

[0113] Furthermore, the distance between the first cooling pipe 401 and the second cooling pipe 402 is greater than the distance between the second cooling pipe 402 and the third cooling pipe 403.

[0114] This design ensures sufficient spacing between the first cooling pipe 401 and the second cooling pipe 402 for the installation of the ignition device 700, guaranteeing the installation distance between the ignition device 700 and the combustion component 600 in terms of height. It also cools the wall surface where the ignition device 700 is located, preventing the ignition device 700 from deforming or loosening due to heat, thus ensuring the installation reliability of the ignition device 700 and extending its service life.

[0115] like Figure 1 To the diagram and Figure 9 In one embodiment, the cross-sectional shape of the heat exchange tube 200 is elliptical, and the major axis of the heat exchange tube 200 is aligned with the flue gas flow direction. By setting the heat exchange tube 200 as an elliptical tube, the heat exchange area of ​​the heat exchange tube 200 is increased. At the same time, aligning the major axis of the heat exchange tube 200 with the flue gas flow direction can reduce the flow resistance of the high-temperature flue gas and improve the heat exchange efficiency.

[0116] It should be noted that the flue gas temperature is distributed from high to low from top to bottom. By placing the first cooling pipe 401 and the second cooling pipe 402, which have smaller flow cross-sectional areas, at the higher flue gas temperature positions, the heat exchange area with the high-temperature flue gas can be reduced, preventing high-temperature vaporization. Placing the third cooling pipe 403, which has a larger flow cross-sectional area, at the lower flue gas temperature positions increases the heat exchange area, maximizing the utilization of heat at this location. Placing the finned heat exchanger tube 200 at the lower flue gas temperature positions results in an even larger heat exchange area, where the convective heat transfer capacity of the high-temperature flue gas is strongest, thus improving heat exchange efficiency. In this way, the high-temperature flue gas temperature is utilized in a stepped manner, allowing the heat from the high-temperature flue gas to be absorbed across the entire temperature range within the heat exchanger, thereby improving the heat exchanger's efficiency.

[0117] This utility model also proposes a gas water heater, which includes a heat exchanger. The specific structure of the heat exchanger is as described in the above embodiments. Since this gas water heater adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0118] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A heat exchanger, characterized in that, include: The shell includes a first sidewall and a second sidewall opposite to each other along a first direction, and a third sidewall and a fourth sidewall opposite to each other along a second direction. The first sidewall, the fourth sidewall, the second sidewall and the third sidewall are connected end to end to enclose a heat exchange chamber that is open to both ends in the third direction. The first direction, the second direction, and the third direction intersect each other; Multiple heat exchange tubes are disposed in the heat exchange chamber, and the two ends of the heat exchange tubes extend along the second direction to pass through the third side wall and the fourth side wall respectively; Multiple first water boxes are respectively disposed on the third side wall and the fourth side wall; each pair of adjacent heat exchange tubes are connected through a first water box, so that multiple heat exchange tubes are connected in series to form a heat exchange channel, and the heat exchange channel is provided with a water inlet; Two sets of cooling channels are respectively disposed on the first sidewall and the second sidewall, and are connected to the heat exchange channels; and Two second water boxes are respectively disposed on the third side wall and the fourth side wall; one of the second water boxes connects the two sets of cooling channel groups, and the other second water box is provided with a water outlet; Wherein, the height dimension h1 of the first water box in the second direction and the height dimension h2 of the second water box in the second direction satisfy: h1>h2.

2. The heat exchanger as described in claim 1, characterized in that, The height dimension h1 of the first water box in the second direction and the height dimension h2 of the second water box in the second direction satisfy: h1 < 3h2.

3. The heat exchanger as described in claim 1, characterized in that, Multiple first water boxes on the same side wall are set up independently.

4. The heat exchanger as described in claim 3, characterized in that, The first water box includes: The first bottom shell has two first mounting holes, and two adjacent heat exchange tubes are respectively inserted into the two first mounting holes; and The first cover is placed on the side of the first bottom shell away from the shell and forms a first flow cavity with the first bottom shell. The two adjacent heat exchange tubes are connected to the first flow cavity.

5. The heat exchanger as described in claim 4, characterized in that, The first cover shell is welded and fixed to the first bottom shell.

6. The heat exchanger as described in claim 4, characterized in that, The heat exchange tube is welded and fixed to the periphery of the corresponding first mounting hole; And / or, the first bottom shell is welded and fixed to the corresponding third sidewall or the fourth sidewall.

7. The heat exchanger according to any one of claims 1 to 6, characterized in that, The second water box extends along the first direction and is disposed on the corresponding third and fourth side walls.

8. The heat exchanger according to any one of claims 1 to 6, characterized in that, The heat exchanger also includes two mounting plates disposed outside the third and fourth side walls, the mounting plates protruding outward in a direction away from the shell to form the second water box; The first water box is located on the outside of the mounting plate, and the mounting plate has multiple first through holes for the heat exchange tubes to pass through.

9. The heat exchanger according to any one of claims 1 to 6, characterized in that, Each cooling channel group includes at least two cooling pipes arranged in parallel along a third direction; The heat exchanger also includes a third water box disposed on the third side wall or the fourth side wall, the third water box connecting the cooling channel assembly on the first side wall to one end of the heat exchange channel.

10. The heat exchanger as claimed in claim 9, characterized in that, The third water box is set up independently of the first water box.

11. The heat exchanger as claimed in claim 10, characterized in that, The third water tank includes: The third bottom shell has a second mounting hole and at least two third mounting holes, the second mounting hole for mounting the corresponding heat exchange tube, and the at least two third mounting holes for mounting the corresponding cooling tube; and The third cover is installed on the side of the third bottom shell away from the shell and forms a third flow cavity with the third bottom shell. The corresponding heat exchange tube and at least two cooling tubes are all in communication with the third flow cavity.

12. The heat exchanger as claimed in claim 11, characterized in that, The third cover shell is welded and fixed to the third bottom shell.

13. The heat exchanger as claimed in claim 11, characterized in that, The periphery of the second mounting hole is welded and fixed to the corresponding heat exchange tube, and the cooling tube is welded and fixed to the periphery of the corresponding third mounting hole; And / or, the third bottom shell is welded and fixed to the first sidewall.

14. The heat exchanger as claimed in claim 9, characterized in that, The height dimension h3 of the third water box in the second direction satisfies: h2 <h3<3h2。 15. The heat exchanger as claimed in claim 9, characterized in that, The third water box extends in a third direction.

16. The heat exchanger according to any one of claims 1 to 6, characterized in that, The inlet and the outlet are located on the same side of the housing.

17. The heat exchanger according to any one of claims 1 to 6, characterized in that, The third direction is the vertical direction of the housing. In the third direction, the water outlet is located on the upper edge of the second water box. The upper edge of the second water box with the outlet is higher than the upper edge of the second water box opposite.

18. The heat exchanger according to any one of claims 1 to 6, characterized in that, In the third direction, the upper surface of the water outlet is higher than the upper surface of the cooling channel assembly.

19. The heat exchanger according to any one of claims 1 to 6, characterized in that, The cooling channel assembly includes a first cooling pipe, a second cooling pipe, and a third cooling pipe arranged sequentially along a third direction, wherein the cross-sectional area of ​​the first cooling pipe and / or the second cooling pipe is smaller than the cross-sectional area of ​​the third cooling pipe.

20. The heat exchanger as claimed in claim 19, characterized in that, The cross-sectional shape of the first cooling pipe is circular; And / or, the flow cross-sectional shape of the second cooling pipe is circular; And / or, the cross-sectional shape of the third cooling pipe is elliptical.

21. The heat exchanger as claimed in claim 19, characterized in that, The distance between the first cooling pipe and the second cooling pipe is greater than the distance between the second cooling pipe and the third cooling pipe.

22. A gas water heater, characterized in that, Includes the heat exchanger as described in any one of claims 1 to 21.

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