Condensing heat exchanger and gas water heater with same

Abstract

This invention provides a condensing heat exchanger and a gas water heater incorporating it, belonging to the field of kitchen appliance technology. The condensing heat exchanger includes a shell, a heat exchange assembly, and a flow guiding assembly. The shell has a flue gas inlet chamber and a heat exchange chamber connected sequentially. The flue gas inlet chamber has a first flue gas inlet, and the heat exchange chamber has a second flue gas inlet connected to the first flue gas inlet. The heat exchange assembly is installed inside the heat exchange chamber, and multiple heat exchange tube groups are arranged sequentially along the water flow direction. Each heat exchange tube group includes multiple heat exchange tubes, wherein the number of heat exchange tubes in the heat exchange tube groups located in the upper part of the heat exchange chamber is greater than the number of heat exchange tubes in the heat exchange tube groups located in the lower part of the heat exchange chamber. The flow guiding assembly is connected to the inner wall of the heat exchange chamber near the second flue gas inlet. High-temperature flue gas entering the second flue gas inlet is guided by the flow guiding assembly and flows to the lower part of the heat exchange chamber. This invention allows more high-temperature flue gas to flow to the lower part of the heat exchange chamber, increasing the heat exchange effect in the lower part of the condensing heat exchanger and improving heat exchange efficiency.

Description

Technical Field

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

[0002] The condensing heat exchanger is the core component of a gas water heater, consisting of a shell and heat exchange components housed within the shell. High-temperature flue gas generated by the gas water heater enters the shell and exchanges heat with the heat exchange components, thus fully utilizing the heat generated during gas combustion. However, existing heat exchange components typically have the same number of water pipes, failing to fully utilize the flow area of ​​the high-temperature flue gas and easily leading to poor heat exchange in localized areas. Utility Model Content

[0003] The first technical problem to be solved by this utility model is to address the problems of the prior art by providing a condensing heat exchanger that, by setting different numbers of heat exchange tubes at the top and bottom and the flow guiding components, allows more high-temperature flue gas to flow to the lower part of the heat exchange chamber, thereby increasing the heat exchange effect between the high-temperature flue gas and the heat exchange tube assembly at the lower part of the heat exchange chamber and reducing costs.

[0004] The second technical problem to be solved by this utility model is a gas water heater applied to the aforementioned condensing heat exchanger.

[0005] The technical solution adopted by this utility model to solve the first technical problem mentioned above is: a condensing heat exchanger, the condensing heat exchanger comprising:

[0006] The shell is provided with a smoke inlet chamber and a heat exchange chamber connected in sequence. The smoke inlet chamber is provided with a first smoke inlet, and the heat exchange chamber is provided with a second smoke inlet connected to the first smoke inlet.

[0007] A heat exchange assembly is installed inside the heat exchange chamber. Multiple heat exchange tube groups are arranged sequentially along the water flow direction. Each heat exchange tube group includes multiple heat exchange tubes. The number of heat exchange tubes in the heat exchange tube group located in the upper part of the heat exchange chamber is greater than the number of heat exchange tubes in the heat exchange tube group located in the lower part of the heat exchange chamber.

[0008] A flow guiding component is connected to the inner wall of the heat exchange chamber near the second flue gas inlet. The high-temperature flue gas entering the second flue gas inlet is guided by the flow guiding component and flows to the lower part of the heat exchange chamber.

[0009] According to one embodiment of the present invention, the number of heat exchange tube groups is 1, and the heat exchange tube groups are sequentially arranged along the water flow direction as a first heat exchange tube group, a second heat exchange tube group, a third heat exchange tube group, and a fourth heat exchange tube group. The number of heat exchange tubes in the first heat exchange tube group and the fourth heat exchange tube group are equal, and the number of heat exchange tubes in the first heat exchange tube group is greater than the number of heat exchange tubes in the second heat exchange tube group or the third heat exchange tube group.

[0010] According to one embodiment of the present invention, the heat exchange chamber further includes a first flue gas outlet, and the flow guiding assembly includes:

[0011] The first guide plate is located on the side of the second smoke inlet near the first smoke outlet and is connected between the cavity wall of the heat exchange chamber and the heat exchange assembly to prevent high-temperature flue gas from flowing directly out of the first smoke outlet.

[0012] The second guide plate is disposed in the middle of the second flue gas inlet, and the second guide plate is inclined downward from the second flue gas inlet toward the interior of the heat exchange cavity, so as to guide the high temperature flue gas entering the heat exchange cavity to the lower part of the heat exchange cavity.

[0013] According to one embodiment of the present invention, the second guide plate includes:

[0014] The guide plate body has its middle part bent towards the smoke inlet chamber, and the cross-section of the guide plate body is "V" shaped;

[0015] Two flanges are respectively connected to both ends of the guide plate body, and each flange is connected to the cavity wall of the heat exchange chamber.

[0016] According to one embodiment of the present invention, the bending angle of the guide plate body is α, wherein 150°≤α≤170°.

[0017] According to one embodiment of the present invention, the guide plate body has the following openings:

[0018] The first flow guide hole array is located in the middle of the flow guide plate body, and the plate area occupied by the first flow guide hole array is 0.5 to 0.6 times the plate area of ​​the flow guide plate body.

[0019] Two second flow guide hole arrays are located at both ends of the first flow guide hole array;

[0020] The opening ratio of the first flow guide array is 25% to 40%, and the opening ratio of the second flow guide array is 35% to 50%.

[0021] According to one embodiment of the present invention, the first flow guide hole array includes at least a plurality of first flow guide holes with two different apertures, and the second flow guide hole array includes a plurality of second flow guide holes with the same aperture. The aperture of the first flow guide hole is 1.8 to 3 mm, and the diameter of the second flow guide hole is 3.5 to 4.5 mm.

[0022] According to one embodiment of the present invention, the angle between the second guide plate and the horizontal plane is β, wherein 45°≤β≤65°.

[0023] According to one embodiment of the present invention, the first guide plate includes:

[0024] The smoke baffle is L-shaped and includes a vertical plate segment and a horizontal plate segment. The vertical plate segment is connected to the cavity wall of the heat exchange chamber, and the horizontal plate segment is connected to the vertical plate segment and extends in the direction of the heat exchange assembly to prevent the high-temperature flue gas from flowing directly out of the first smoke outlet.

[0025] The smoke guide section has one end connected to the free end of the horizontal plate segment and the other end extending downward to the heat exchange component, so as to guide the high-temperature flue gas blocked by the smoke baffle section towards the heat exchange component.

[0026] Each of the smoke guiding parts is provided with a smoke guiding hole.

[0027] The technical solution adopted by this utility model to solve the second technical problem mentioned above is: a gas water heater, the gas water heater comprising: a condensing heat exchanger as described in any of the above claims.

[0028] Compared with the prior art, the present invention has the following advantages or beneficial effects:

[0029] This invention, by setting different numbers of heat exchange tubes at the top and bottom and the flow guiding component, allows more high-temperature flue gas to flow to the lower part of the heat exchange chamber, which not only increases the heat exchange between the high-temperature flue gas and the heat exchange tube assembly and improves the heat exchange efficiency, but also reduces the cost. Attached Figure Description

[0030] The above and other features and advantages of this invention will become more apparent from a detailed description of exemplary embodiments with reference to the accompanying drawings.

[0031] Figure 1 This is a schematic diagram of a condensing heat exchanger according to an exemplary embodiment.

[0032] Figure 2 This is an exploded view of a condenser heat exchanger according to an exemplary embodiment.

[0033] Figure 3 This is a cross-sectional view of a condensing heat exchanger according to an exemplary embodiment.

[0034] Figure 4 This is a schematic diagram showing the connection of the heat exchange chamber, heat exchange assembly, and flow guiding assembly of a condenser heat exchanger according to an exemplary embodiment.

[0035] Figure 5 This is a schematic diagram of a second deflector according to an exemplary embodiment.

[0036] Figure 6This is a schematic diagram illustrating the bending angle of a second guide plate according to an exemplary embodiment.

[0037] Figure 7 This is a schematic diagram of a first deflector plate according to an exemplary embodiment. Attached image description:

[0039] 1. Shell; 11. Smoke inlet chamber; 111. First smoke inlet; 12. Heat exchange chamber; 121. Second smoke inlet; 122. First smoke outlet; 123. Water inlet; 124. Water outlet;

[0040] 2. Heat exchange assembly; 21. Heat exchange tube assembly; 21a. First heat exchange tube assembly; 21b. Second heat exchange tube assembly; 21c. Third heat exchange tube assembly; 21d. Fourth heat exchange tube assembly; 211. Heat exchange tube;

[0041] 3. Flow guiding assembly; 31. First flow guiding plate; 311. Smoke blocking part; 3111. Vertical plate segment; 3112. Horizontal plate segment; 312. Smoke guiding part; 313. Smoke guiding hole; 32. Second flow guiding plate; 321. Flow guiding plate body; 3211. First flow guiding hole array; 32111. First flow guiding hole; 3212. Second flow guiding hole array; 32121. Second flow guiding hole; 322. Flanged edge. Detailed Implementation

[0042] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0043] The terms “a,” “one,” and “the” are used to indicate the existence of one or more elements / components / etc.; the terms “include” and “have” are used to indicate an open-ended meaning of inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.

[0044] This utility model embodiment provides a condensing heat exchanger, such as Figure 1-7As shown, the condensing heat exchanger includes a shell 1, a heat exchange assembly 2, and a flow guiding assembly 3. The shell 1 is provided with a flue gas inlet chamber 11 and a heat exchange chamber 12 connected in sequence. The flue gas inlet chamber 11 is provided with a first flue gas inlet 111, and the heat exchange chamber 12 is provided with a second flue gas inlet 121 connected to the first flue gas inlet 111. The heat exchange assembly 2 is installed inside the heat exchange chamber 12, and multiple heat exchange tube groups 21 are arranged in sequence along the water flow direction. Each heat exchange tube group 21 includes multiple heat exchange tubes 211. The number of heat exchange tubes in the heat exchange tube group 21 located in the upper part of the heat exchange chamber 12 is greater than the number of heat exchange tubes in the heat exchange tube group 21 located in the lower part of the heat exchange chamber 12. The flow guiding assembly 3 is connected to the inner wall of the heat exchange chamber 12 near the second flue gas inlet 121. The high-temperature flue gas entering the second flue gas inlet 121 is guided by the flow guiding assembly 3 and flows to the lower part of the heat exchange chamber 12. In the prior art, there is less high-temperature flue gas in the lower part of the heat exchange chamber 12 and more high-temperature flue gas in the upper part of the heat exchange chamber 12. In this application, on the one hand, the number of heat exchange tubes is redesigned according to the flue gas distribution. By setting different numbers of heat exchange tubes 211 at the top and bottom, the heat exchange effect between the high-temperature flue gas in the lower part of the heat exchange chamber 12 and the heat exchange tube group 21 is increased, and the number of heat exchange tubes in the heat exchange tube group 21 in the lower part of the heat exchange chamber 12 is reduced. On the other hand, the flow guiding component 3 is set so that more high-temperature flue gas can flow to the lower part of the heat exchange chamber 12, further enhancing the heat exchange in the lower part of the heat exchange chamber 12 and improving the heat exchange efficiency.

[0045] In a preferred embodiment of this utility model, such as Figure 1-4 The number of heat exchanger tube groups 21 shown is 4. The 4 heat exchanger tube groups 21 are arranged in the direction of water flow as follows: first heat exchanger tube group 21a, second heat exchanger tube group 21b, third heat exchanger tube group 21c and fourth heat exchanger tube group 21d. The number of heat exchanger tubes in the first heat exchanger tube group 21a is equal to the number of heat exchanger tubes in the fourth heat exchanger tube group 21d. The number of heat exchanger tubes in the first heat exchanger tube group 21a is greater than the number of heat exchanger tubes in the second heat exchanger tube group 21b and / or the third heat exchanger tube group 21c. In this application, the side wall of the heat exchange chamber 12 is also provided with an inlet 123 and an outlet 124. The inlet 123 is connected to the inlet end of the first heat exchange tube group 21a, and the outlet 124 is connected to the outlet end of the fourth heat exchange tube group 21d. Water flows through the inlet 123, through the first heat exchange tube group 21a, the second heat exchange tube group 21b, the third heat exchange tube group 21c, and the fourth heat exchange tube group 21d, and then flows out from the outlet 124, completing heat exchange with the high-temperature flue gas in the process. This application improves the heat exchange effect of the heat exchange component 2 in two aspects: on the one hand, such as Figure 3The first heat exchange tube group 21a and the fourth heat exchange tube group 21d are located at the upper part of the heat exchange chamber 12, while the second heat exchange tube group 21b and the third heat exchange tube group 21c are located below the condenser heat exchanger. The number of heat exchange tubes in the first heat exchange tube group 21a, the second heat exchange tube group 21b, the third heat exchange tube group 21c, and the fourth heat exchange tube group 21d are 9, 8, 6, and 9, respectively. When water flows along the first heat exchange tube group 21a, the second heat exchange tube group 21b, the third heat exchange tube group 21c, and the fourth heat exchange tube group 21d, the water velocity increases as the number of heat exchange tubes decreases, and decreases as the number of heat exchange tubes increases. That is, the water velocity is faster in the second heat exchange tube group 21b and the third heat exchange tube group 21c, and slower in the fourth heat exchange tube group 21d, which allows for sufficient heat exchange with the high-temperature flue gas. On the other hand, considering that there is less high-temperature flue gas in the lower part of the heat exchange chamber 12 and more in the upper part, this application places the third heat exchange tube group 21c and the fourth heat exchange tube group 21d on the air inlet side of the heat exchange chamber 12. This way, the high-temperature flue gas first exchanges with the third heat exchange tube group 21c and the fourth heat exchange tube group 21d, reducing heat loss during water flow and ensuring the temperature of the outlet 124. This results in a higher flow velocity in the heat exchange tubes 211 at the lower part of the condenser where there is less flue gas, and a slower flow velocity in the heat exchange tubes 211 at the upper part of the condenser where there is more flue gas, thus enhancing the heat exchange effect. In other words, this application can enhance the heat exchange effect while reducing the number of heat exchange tubes in the lower part of the condenser, achieving the goal of cost reduction and efficiency improvement. Additionally, it should be noted that in this application, the number of heat exchange tubes in the first heat exchange tube group 21a and the fourth heat exchange tube group 21d are equal. The number of heat exchange tubes in the first heat exchange tube group can be greater than the number of heat exchange tubes in the second heat exchange tube group 21b, or greater than the number of heat exchange tubes in the third heat exchange tube group 21c, or the number of heat exchange tubes in the first heat exchange tube group can be greater than the number of heat exchange tubes in both the second heat exchange tube group 21b and the third heat exchange tube group 21c. Figure 3 The number of the first heat exchanger tube group 21a, the second heat exchanger tube group 21b, the third heat exchanger tube group 21c, and the fourth heat exchanger tube group 21d mentioned above is only one embodiment for the sake of illustration. Other embodiments may use other numbers, as long as they can accelerate the water flow in the lower part where there is less high-temperature flue gas. This application does not impose any restrictions on this.

[0046] In a preferred embodiment of this utility model, such as Figure 1-7The heat exchange chamber 12 shown also includes a first flue gas outlet 122. The flow guiding assembly 3 includes a first flow guiding plate 31 and a second flow guiding plate 32. The first flow guiding plate 31 is located on the side of the second flue gas inlet 121 near the first flue gas outlet 122 and is connected between the cavity wall of the heat exchange chamber 12 and the heat exchange assembly 2 to prevent high-temperature flue gas from flowing directly out of the first flue gas outlet 122. The second flow guiding plate 32 is disposed in the middle of the second flue gas inlet 121 and is inclined downward from the second flue gas inlet 121 toward the interior of the heat exchange chamber 12, so as to guide the high-temperature flue gas entering the heat exchange chamber 12 to the lower part of the heat exchange chamber 12. In this application, the first guide plate 31 is located above the second guide plate 32, and the first guide plate 31 is disposed above the heat exchange chamber 12 and the heat exchange assembly 2 on one side corresponding to the second flue gas inlet 121. The projection of the first guide plate 31 along the air inlet side of the second flue gas inlet 121 falls on the upper part of the second flue gas inlet 121. That is, the first guide plate 31 can intercept part of the high-temperature flue gas entering the heat exchange chamber 12 through the second flue gas inlet 121, preventing the high-temperature flue gas from flowing directly out from the first flue gas outlet 122. The second guide plate 32 is inclined inward and downward from the middle of the outlet end of the second flue gas inlet 121, so that the airflow of the second flue gas inlet 121 is divided into two branches. The high-temperature flue gas located on the windward side of the second guide plate 32 moves downward along the second guide plate 32 to the lower part of the heat exchange chamber 12 to exchange heat with the second heat exchange tube group 21b and the third heat exchange tube group 21c. The high-temperature flue gas entering the leeward side of the second guide plate 32 moves inward along the area between the first guide plate 31 and the second guide plate 32, moving sequentially from the upper part to the lower part of the condensing heat exchanger to enhance its heat exchange effect. Therefore, by optimizing the number of heat exchange tubes in the lower part of the heat exchange assembly 2, this application, through the cooperation of the first guide plate 31 and the second guide plate 32, allows more high-temperature flue gas to flow towards the lower part of the heat exchange chamber 12, further enhancing the heat exchange in the lower part of the heat exchange chamber 12 and improving the thermal efficiency of the condensing heat exchanger.

[0047] In a preferred embodiment of this utility model, such as Figure 1-6 The second guide plate 32 shown includes a guide plate body 321 and two flanges 322. The two flanges 322 are respectively connected to both ends of the guide plate body 321, and each flange 322 is connected to the cavity wall of the heat exchange chamber 12. The middle part of the guide plate body 321 is bent towards the smoke inlet chamber 11, and the cross-section of the guide plate body 321 is "V" shaped. In this way, the bending of the guide plate body 321 can guide the high-temperature flue gas to flow to both sides of the guide plate body 321, ensuring that the high-temperature flue gas is evenly distributed in the heat exchange chamber 12. In addition, the guide plate body 321 is fixed by welding the two flanges 322 to the cavity wall of the heat exchange chamber 12, ensuring the stability of the second guide plate 32 and the smoothness of the airflow.

[0048] In a preferred embodiment of this utility model, such as Figure 2-6The bending angle of the guide plate body 321 shown is α, where 150°≤α≤170°. This design can reduce the resistance of the guide plate body 321 to the airflow, reduce the energy loss between the guide plate body 321 and the high-temperature flue gas, optimize the airflow path of the high-temperature flue gas, and make the airflow on the windward side flow more stably to both sides of the heat exchange cavity 12, thereby increasing the heat exchange effect.

[0049] In a preferred embodiment of this utility model, such as Figure 2-5 The guide plate body 321 shown has a first guide hole array 3211 and two second guide hole arrays 3212. The first guide hole array 3211 is located in the middle of the guide plate body 321, and the second guide hole arrays 3212 are located at both ends of the first guide hole array 3211. The plate area occupied by the first guide hole array 3211 is 0.5 to 0.6 times the plate area of ​​the guide plate body 321. The opening ratio of the first guide hole array 3211 is 25% to 40%, and the opening ratio of the second guide hole array 3212 is 35% to 50%. In other words, although the first guide hole array 32111 occupies a relatively large area, its opening ratio is smaller than that of the second guide hole array 3212. In this way, some flue gas comes into contact with and exchanges heat with the heat exchange tube 211 after passing through the first guide hole array 3211, while some high-temperature flue gas flows along the guide plate body 321 to the second guide hole array 3212 and then enters both sides of the heat exchange cavity 12, ensuring that the high-temperature flue gas is evenly distributed in the heat exchange cavity 12 and improving the heat exchange effect of the heat exchanger.

[0050] In a preferred embodiment of this utility model, such as Figure 2-5 The first guide hole array 3211 shown includes at least two different diameters of first guide holes 32111, and the second guide hole array 3212 includes multiple diameters of second guide holes 32121. The diameters of the first guide holes 32111 are 1.8–3 mm, and the diameters of the second guide holes 32121 are 3.5–4.5 mm. By setting different diameters of first guide holes 32111, the flue gas resistance and energy loss in the middle of the guide plate body 321 can be reduced, the pressure distribution of the guide plate body 321 can be optimized, and the airflow can be distributed more evenly and stably in the heat exchange chamber 12, ensuring the heat exchange effect of the heat exchanger.

[0051] In a preferred embodiment of this utility model, such as Figure 1-3 The angle between the second guide plate 32 and the horizontal plane is β, where 45°≤β≤65°. Thus, when the high-temperature flue gas passes through the second guide plate 32 designed with the aforementioned angle, it not only undergoes a smooth deflection but also generates downward pressure on the windward side of the guide plate 32. This pressure guides the high-temperature flue gas to preferentially flow towards the heat exchange tube assembly 21 at the lower part of the heat exchange chamber 12 for heat exchange, improving the poor heat exchange effect at the lower part of the heat exchange chamber 12 in the prior art and enhancing heat exchange efficiency.

[0052] In a preferred embodiment of this utility model, such as Figure 1-7 The first guide plate 31 shown includes a smoke-blocking part 311 and a smoke-guiding part 312. The smoke-blocking part 311 is L-shaped and includes a vertical plate section 3111 and a horizontal plate section 3112. Both ends of the smoke-guiding part 312 are provided with smoke-guiding holes 313. The vertical plate section 3111 is connected to the cavity wall of the heat exchange chamber 12, and the horizontal plate section 3112 is connected to the vertical plate section 3111 and extends towards the heat exchange assembly 2 to prevent high-temperature flue gas from flowing directly out of the first smoke outlet 122. One end of the smoke-guiding part 312 is connected to the free end of the horizontal plate section 3112, and the other end extends downward to the heat exchange assembly 2. The smoke-guiding part 312 and the smoke-guiding holes 313 on it can guide the high-temperature flue gas blocked by the smoke-blocking part 311 to flow towards the heat exchange assembly 2. The smoke-guiding part 312 is provided with smoke-guiding holes 313. In this application, the first guide plate 31 is located between the second smoke inlet 121 and the first smoke outlet 122. The vertical plate segment 3111 is welded to the cavity wall of the heat exchange chamber 12, and the horizontal plate segment 3112 is located between the heat exchange assembly 2 and the cavity wall of the heat exchange chamber 12. The smoke guide section 312 extends downward from the free end of the horizontal plate segment 3112 to the side of the heat exchange assembly 2 corresponding to the second smoke inlet 121. Thus, when the high-temperature flue gas flows from the first smoke inlet 111 toward the heat exchange chamber 12, the high-temperature flue gas flows directly to the heat exchange assembly 2 through the upper and lower surfaces of the guide plate body 321 for heat exchange. Among them, some of the high-temperature flue gas first flows toward the guide plate body 321, is then blocked by the guide plate body 321, and then moves downward to the heat exchange assembly 2 under the guidance of the smoke guide section 312 for heat exchange.

[0053] In addition, in this application, the projection of the smoke guide section 312 along the air intake direction of the second smoke inlet 121 falls above the second smoke inlet 121, and the first smoke outlet 123 is located in the middle of the smoke guide section 312. Therefore, the middle of the smoke guide section 312 is not provided with a smoke guide hole 313, that is, smoke guide holes 313 are only provided at both ends of the smoke guide section 312. This allows the flue gas to flow to both sides of the first guide plate 31 and enter the heat exchange chamber 12 and both sides of the heat exchange component 2 for heat exchange, thus preventing the flue gas from flowing out directly from the first smoke outlet 122.

[0054] Furthermore, the perforation rate of the smoke guide holes 313 of the first guide plate 31 is controlled to be between 20% and 30%. This design allows a small portion of the high-temperature flue gas to flow directly to the heat exchange component 2 through the smoke guide holes 313, reducing the heat loss of the high-temperature flue gas flowing to both sides of the first guide plate 31 and improving the heat exchange efficiency.

[0055] This utility model embodiment provides a gas water heater with a condensing heat exchanger, the gas water heater including as follows: Figure 1-7The condenser heat exchanger shown can make full use of the distribution location of high-temperature flue gas, reduce the number of heat exchange tubes at the bottom while increasing the flow guiding components, so that more high-temperature flue gas enters the bottom of the condenser heat exchanger and fully exchanges heat with the heat exchange tubes 211, thereby improving heat exchange efficiency and reducing costs.

[0056] In this embodiment of the invention, the term "multiple" refers to two or more, unless otherwise explicitly defined. The terms "install," "connect," and "fix" should be interpreted broadly. For example, "connect" can mean a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention based on the specific circumstances.

[0057] In the description of the embodiments of this utility model, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific direction or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0058] In the description of this specification, the terms "an embodiment," "a preferred embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0059] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A condensing heat exchanger, characterized by, include: The shell (1) is provided with a smoke inlet chamber (11) and a heat exchange chamber (12) connected in sequence. The smoke inlet chamber (11) is provided with a first smoke inlet (111), and the heat exchange chamber (12) is provided with a second smoke inlet (121) connected to the first smoke inlet (111). A heat exchange assembly (2) is installed inside the heat exchange chamber (12), and multiple heat exchange tube groups (21) are arranged sequentially along the water flow direction. Each heat exchange tube group (21) includes multiple heat exchange tubes (211). The number of heat exchange tubes in the heat exchange tube group (21) located in the upper part of the heat exchange chamber (12) is greater than the number of heat exchange tubes in the heat exchange tube group (21) located in the lower part of the heat exchange chamber (12). The flow guiding component (3) is connected to the inner wall of the heat exchange chamber (12) near the second flue gas inlet (121). The high-temperature flue gas entering the second flue gas inlet (121) is guided by the flow guiding component (3) and flows to the lower part of the heat exchange chamber (12).

2. The condensing heat exchanger according to claim 1, wherein The number of heat exchange tube groups (21) is 4. The 4 heat exchange tube groups (21) are arranged in the direction of water flow as the first heat exchange tube group (21a), the second heat exchange tube group (21b), the third heat exchange tube group (21c) and the fourth heat exchange tube group (21d). The number of heat exchange tubes in the first heat exchange tube group (21a) is equal to the number of heat exchange tubes in the fourth heat exchange tube group (21d). The number of heat exchange tubes in the first heat exchange tube group (21a) is greater than the number of heat exchange tubes in the second heat exchange tube group (21b) or the third heat exchange tube group (21c).

3. The condensing heat exchanger of claim 1, wherein The heat exchange chamber (12) further includes a first flue gas outlet (122), and the flow guiding assembly (3) includes: The first guide plate (31) is located on the side of the second smoke inlet (121) near the first smoke outlet (122) and is connected between the cavity wall of the heat exchange chamber (12) and the heat exchange assembly (2) to prevent high-temperature flue gas from flowing directly out of the first smoke outlet (122). The second guide plate (32) is located in the middle of the second flue gas inlet (121), and the second guide plate (32) is inclined downward from the second flue gas inlet (121) toward the interior of the heat exchange chamber (12), so that the high temperature flue gas entering the heat exchange chamber (12) can be guided to the lower part of the heat exchange chamber (12).

4. The condensing heat exchanger according to claim 3, wherein The second guide vane (32) includes: The guide plate body (321) is bent in the direction of the smoke inlet chamber (11) in the middle part, and the cross-section of the guide plate body (321) is "V" shaped; Two flanges (322) are respectively connected to the two ends of the guide plate body (321), and each flange (322) is connected to the cavity wall of the heat exchange cavity (12).

5. The condensing heat exchanger of claim 4, wherein The bending angle of the guide plate body (321) is α, where 150°≤α≤170°.

6. The condensing heat exchanger of claim 4, wherein The guide vane body (321) has the following openings: The first flow guide hole array (3211) is located in the middle of the flow guide plate body (321), and the plate area occupied by the first flow guide hole array (3211) is 0.5 to 0.6 times the plate area of ​​the flow guide plate body (321). Two second flow guide hole arrays (3212) are located at both ends of the first flow guide hole array (3211); The opening ratio of the first flow guide array (3211) is 25% to 40%, and the opening ratio of the second flow guide array (3212) is 35% to 50%.

7. The condensing heat exchanger of claim 6, wherein The first flow guide array (3211) includes at least two different apertures of multiple first flow guide holes (32111), and the second flow guide array (3212) includes multiple second flow guide holes (32121) of the same aperture. The aperture of the first flow guide hole (32111) is 1.8 to 3 mm, and the diameter of the second flow guide hole (32121) is 3.5 to 4.5 mm.

8. The condensing heat exchanger according to claim 6, characterized in that, The angle between the second guide plate (32) and the horizontal plane is β, where 45°≤β≤65°.

9. The condensing heat exchanger of claim 3, wherein The first guide vane (31) includes; The smoke baffle (311) is L-shaped and includes a vertical plate segment (3111) and a horizontal plate segment (3112). The vertical plate segment (3111) is connected to the cavity wall of the heat exchange chamber (12), and the horizontal plate segment (3112) is connected to the vertical plate segment (3111) and extends toward the heat exchange assembly (2) to prevent the high-temperature flue gas from flowing directly out of the first smoke outlet (122). The smoke guide (312) is connected at one end to the free end of the horizontal plate segment (3112) and extends downward to the heat exchange assembly (2) to guide the high-temperature flue gas blocked by the smoke baffle (311) to the heat exchange assembly (2). The smoke guide part (312) is provided with a smoke guide hole (313).

10. A gas water heater, characterized by, Includes the condensing heat exchanger as described in any one of claims 1-9.

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