Condensing heat exchanger for a gas water heater and gas water heater

Abstract

The embodiment of the present application discloses a condensing heat exchanger for a gas water heater and the gas water heater, the condensing heat exchanger comprises: a condensing heat exchanger shell, the condensing heat exchanger shell comprises a first cavity and a second cavity in communication with each other, flue gas generated by a burner of the gas water heater enters the condensing heat exchanger and flows through the first cavity and the second cavity in turn; a heat exchange part, the heat exchange part is arranged in the first cavity and the second cavity, and is used for heat exchange between liquid flowing through the heat exchange part and the flue gas; the heat exchange part comprises a first heat exchange part and a second heat exchange part, the first heat exchange part is arranged in the first cavity, and at least part of the second heat exchange part is arranged in the second cavity. Through the condensing heat exchanger of the embodiment of the present application, the heat exchange efficiency of the gas water heater can be improved, the processing cost is relatively low, and the assembly is simple.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the field of gas equipment, in particular to a condensation heat exchanger for a gas water heater and the gas water heater. BACKGROUND

[0002] At present, the commonly used gas water heater comprises a fan, a burner, a main heat exchanger and the like. The burner ignites the combustible gas mixed in the fan, and the flue gas produced by the combustion of the combustible gas generates heat, which is transferred to the liquid entering the gas water heater through the main heat exchanger, so as to realize energy exchange. The main heat exchanger is mainly used for absorbing the sensible heat in the flue gas. Since the main heat exchanger is used for absorbing the sensible heat in the flue gas, the temperature of the flue gas is still high, and the heat of the flue gas cannot be fully utilized.

[0003] It should be noted that the above introduction to the technical background is only for the convenience of clearly and completely describing the technical scheme of the present application and facilitating the understanding of those skilled in the art. The above technical scheme cannot be considered as known to those skilled in the art only because it is described in the background section of the present application. SUMMARY

[0004] In view of the above problems, the embodiment of the present application provides a condensation heat exchanger for a gas water heater and the gas water heater. The condensation heat exchanger can improve the heat exchange efficiency of the gas water heater.

[0005] According to a first aspect of the embodiment of the present application, a condensation heat exchanger for a gas water heater is provided, which comprises:

[0006] A condensation heat exchanger shell, which comprises a first cavity and a second cavity in communication with each other, and the flue gas generated by the burner of the gas water heater enters the condensation heat exchanger and flows through the first cavity and the second cavity in sequence;

[0007] A heat exchange part, which is arranged in the first cavity and the second cavity, and is used for heat exchanging the liquid flowing through the heat exchange part with the flue gas;

[0008] The heat exchange part comprises a first heat exchange part and a second heat exchange part, the first heat exchange part is arranged in the first cavity, and at least part of the second heat exchange part is arranged in the second cavity.

[0009] Further, the liquid flowing through the second heat exchange part flows into the first heat exchange part after heat exchanging with the flue gas.

[0010] Further, part of the second heat exchange portion is arranged in the second cavity, and part of the second heat exchange portion is arranged in the first cavity, and the liquid first flows through the part of the second heat exchange portion in the first cavity and then enters the part of the second heat exchange portion in the second cavity.

[0011] Further, the first heat exchange portion has a first pipe body, and the second heat exchange portion has a second pipe body, an inlet of the second pipe body is used for flowing in the liquid, an outlet of the second pipe body is connected with an inlet of the first pipe body, and an outlet of the first pipe body is used for flowing out the liquid.

[0012] Further, the part of the second heat exchange portion arranged in the second cavity includes a first sub heat exchange portion and a second sub heat exchange portion at different heights, and the first sub heat exchange portion is connected with the second sub heat exchange portion to make the liquid first flow through the first sub heat exchange portion and then flow into the second sub heat exchange portion.

[0013] Further, the liquid flowing through the first heat exchange portion exchanges heat with the flue gas and then flows into the second heat exchange portion.

[0014] Further, part of the second heat exchange portion is arranged in the second cavity, and part of the second heat exchange portion is arranged in the first cavity, and the liquid first flows through the part of the second heat exchange portion in the second cavity and then enters the part of the second heat exchange portion in the first cavity.

[0015] Further, the first heat exchange portion has a first pipe body, and the second heat exchange portion has a second pipe body, an inlet of the second pipe body is used for flowing in the liquid, an outlet of the second pipe body is connected with an inlet of the first pipe body, and an outlet of the first pipe body is used for flowing out the liquid.

[0016] Further, the part of the second heat exchange portion arranged in the second cavity includes a first sub heat exchange portion and a second sub heat exchange portion at different heights, and the first sub heat exchange portion is connected with the second sub heat exchange portion to make the liquid first flow through the first sub heat exchange portion and then flow into the second sub heat exchange portion.

[0017] Further, the first cavity is below the second cavity, and part of the second heat exchange portion arranged in the first cavity extends in the up-down direction.

[0018] Further, the first heat exchange portion and the second heat exchange portion are formed by bending a same pipe body.

[0019] Further, the first sub heat exchange portion and the second sub heat exchange portion are formed by pipe bodies, and the arrangement mode of the pipe body of the first sub heat exchange portion is different from the arrangement mode of the pipe body of the second sub heat exchange portion.

[0020] Further, the first sub-heat exchange part comprises multiple turns of pipe lines formed by pipe bodies, and the turns of the pipe lines of different turns have different sizes.

[0021] Further, the second sub-heat exchange part comprises first bent pipe lines of the same height formed by pipe bodies.

[0022] Further, the first sub-heat exchange part is located above the second sub-heat exchange part, the first sub-heat exchange part and the second sub-heat exchange part are connected through a connecting part, the connecting part is formed by pipe bodies, and the bent part formed by the pipe bodies is not more than 2.

[0023] Further, the first heat exchange part comprises multiple layers of pipe lines formed by pipe bodies in a spiral shape, and the pipe lines of different layers have different heights.

[0024] Further, the pipe lines of different layers are arranged in alignment or staggered arrangement.

[0025] Further, a flow guide is arranged in the first cavity, and the flow guide is used for guiding the flue gas entering the first cavity.

[0026] Further, the condensation heat exchanger shell is provided with a flue gas inlet in the transverse direction, the flow guide comprises a baffle extending in the longitudinal direction, and the flue gas entering the first cavity from the flue gas inlet changes the flow direction after being blocked by the baffle.

[0027] Further, the baffle surrounds a cavity, the lower part of the cavity is provided with a flue gas inlet, the upper part of the cavity is provided with a flue gas outlet, and the flue gas inlet is connected with the flue gas outlet through the cavity.

[0028] Further, a partition is arranged between the first cavity and the second cavity, the partition is provided with a communication port for connecting the first cavity and the second cavity, the flue gas outlet is connected with the communication port, or the flue gas outlet is the communication port.

[0029] Further, the lower edge of the baffle is lower than the lower edge of the flue gas inlet.

[0030] Further, the flow guide is in a cylindrical shape.

[0031] Further, there is a gap between the inner surface of the condensation heat exchanger shell and the baffle, and at least the first heat exchange part is arranged in the gap.

[0032] Further, at least one through hole is arranged on the baffle.

[0033] Further, the first cavity is located below the second cavity.

[0034] Further, the side wall of the condensing heat exchanger shell is further provided with a smoke inlet, and the upper wall of the condensing heat exchanger shell is provided with a smoke outlet, wherein the flue gas enters the first cavity through the smoke inlet, and then flows through the second cavity and is discharged from the smoke outlet.

[0035] Further, a partition is arranged between the first cavity and the second cavity, and the partition is provided with a communication port for communicating the first cavity and the second cavity, and the communication port is coincident or fully coincident with the projection of the smoke outlet in the vertical direction.

[0036] Further, the area of the communication port is equal to or greater than the area of the smoke outlet.

[0037] According to a second aspect of the embodiments of the present application, a gas water heater is provided, which comprises the condensing heat exchanger for a gas water heater as described in the foregoing first aspect.

[0038] Further, the gas water heater further comprises a burner, a main heat exchanger for a gas water heater arranged above the burner, the condensing heat exchanger and a fan, wherein the flue gas generated by the burner sequentially flows through the main heat exchanger, the air inlet of the fan, the air outlet of the fan and the condensing heat exchanger.

[0039] Further, the gas water heater further comprises a liquid inlet and a liquid outlet, wherein the liquid entering through the liquid inlet sequentially flows through the condensing heat exchanger and the main heat exchanger, and then flows out through the liquid outlet.

[0040] Further, at least part of the fan is arranged between the main heat exchanger and the condensing heat exchanger.

[0041] Further, the second cavity at least partially protrudes from the first cavity in the transverse direction.

[0042] At least part of the fan is arranged between the main heat exchanger and the second cavity.

[0043] Further, the fan is arranged above the main heat exchanger, and the part of the second cavity protruding from the first cavity is arranged above at least part of the fan.

[0044] Further, the second cavity is arranged above the first cavity, the first cavity is provided with a smoke inlet, and the air outlet of the fan communicates with the first cavity through the smoke inlet.

[0045] Further, the fan is arranged transversely to the gas water heater, the air inlet of the fan is directed towards the main heat exchanger, and the air outlet of the fan is arranged transversely.

[0046] Further, the fan is obliquely arranged on the gas water heater.

[0047] Further, the part of the fan close to the condensing heat exchanger is higher than the part of the fan far from the condensing heat exchanger.

[0048] Further, the air outlet of the fan is connected with the condensing heat exchanger through an adapter.

[0049] Further, the smoke outlet of the condensing heat exchanger is arranged at or close to the middle of the gas water heater.

[0050] One of the beneficial effects of the embodiment of the present application is that by arranging double cavities in the condensing heat exchanger and arranging heat exchange parts in each cavity, the heat exchange efficiency can be improved, the processing cost is lower, and the assembly is simple.

[0051] With reference to the following description and drawings, specific embodiments of the present application are disclosed in detail, indicating the ways in which the principles of the present application can be employed. It is understood that the embodiments of the present application are not limited in scope in terms of the appended claims and their equivalents. Embodiments of the present application include many changes, modifications and equivalents within the spirit and scope of the appended claims. Features described and / or illustrated with respect to one embodiment can be used in the same or similar manner in one or more other embodiments, in combination with other features in other embodiments, or in place of other features in other embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0052] The drawings described herein are for the purpose of illustrating the present application and are not intended to limit the scope of the present application in any way. In addition, the shapes and proportions of the components in the drawings are only illustrative and are used to help understand the present application, and are not specifically limited to the shapes and proportions of the components. Those skilled in the art can select various possible shapes and proportions to implement the present application according to specific circumstances under the teachings of the present application.

[0053] Figure 1 is a schematic view of a condensing heat exchanger in the embodiment of the present application along the X direction;

[0054] Figure 2 is a side view of the condenser heat exchanger of the embodiment of the present application;

[0055] Figure 3 is a schematic view of the heat exchange part 102 of the embodiment of the present application;

[0056] Figure 4 is a top view of the heat exchange part 102 of the embodiment of the present application;

[0057] Figure 5is a bottom view of the heat exchange part 102 of the embodiment of the present application;

[0058] Figure 6 is a schematic view of the flow guide of the embodiment of the present application;

[0059] Figure 7 is a schematic view of the structure of the gas water heater of the embodiment of the present application;

[0060] Figure 8 is a schematic view of the structure of the gas water heater of the embodiment of the present application;

[0061] Figure 9 is a schematic view of the cross section of the condensing heat exchanger in the embodiment of the present application;

[0062] Figure 10 is a schematic view of the heat exchange part 102 of the embodiment of the present application.

[0063] 101: condensing heat exchanger housing, 102: heat exchange part, 103: flow guide;

[0064] 1011: first cavity, 1012: second cavity, 1021: first heat exchange part, 1022: second heat exchange part; 1013: partition, 1014: communication port, 1015: smoke inlet, 1016: smoke outlet; 10221: one part of the tube, 10222: another part of the tube; 1031: baffle; 1032: flue gas inlet; 1033: flue gas outlet;

[0065] 31, 32, 33: multi-layer coil, 34: first sub heat exchange part, 35: second sub heat exchange part; 36: connecting part, 361, 362, 511, 512, 513: bending part, 37: opening, 41, 42, 43: multi-turn pipe, 51: first bent pipe, 311: first port, 312: second port, 321: third port, 322: fourth port, 61: through hole;

[0066] 700: gas water heater, 701: condensing heat exchanger, 702: burner, 703: main heat exchanger, 704: fan, 705: liquid inlet, 706: liquid outlet, 707: liquid seal device, 708: motor, 709: gas valve and related pipe, 71: adapter, 72: air inlet, 73: air outlet. DETAILED DESCRIPTION

[0067] The technical solutions of the present application will be described in detail below in combination with the drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present application and are not used to limit the scope of the present application. After reading the present application, those skilled in the art can make various equivalent modifications of the present application, which all fall within the scope defined by the appended claims of the present application.

[0068] In the embodiments of the present application, the terms "first", "second" and the like are used to distinguish different elements from each other, but do not indicate spatial arrangement or time sequence of the elements, and the elements should not be limited by these terms. The term "and / or" includes any one and all combinations of the associated listed terms. The terms "comprise", "include", "have" and the like mean the presence of the stated features, elements, components or assemblies, but do not exclude the presence or addition of one or more other features, elements, components or assemblies.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0070] Embodiments of the first aspect

[0071] Embodiments of the first aspect of the present application provide a condensing heat exchanger for a gas water heater, Figure 1 and Figure 9 is a schematic view of a condensing heat exchanger according to an embodiment of the present application along the X direction, as shown in Figure 1 and Figure 9 The condensing heat exchanger comprises:

[0072] A condensing heat exchanger housing 101, the condensing heat exchanger housing comprising a first cavity 1011 and a second cavity 1012 in communication with each other, and the flue gas generated by the burner of the gas water heater flows through the first cavity 1011 and the second cavity 1012 in sequence after entering the condensing heat exchanger;

[0073] A heat exchange portion 102, the heat exchange portion 102 being arranged in the first cavity 1011 and the second cavity 1012, and being used for heat exchange between the liquid flowing through the heat exchange portion 102 and the flue gas;

[0074] The heat exchange portion 102 comprises a first heat exchange portion 1021 and a second heat exchange portion 1022, the first heat exchange portion 1021 being arranged in the first cavity 1011, and at least part of the second heat exchange portion 1022 being arranged in the second cavity 1012.

[0075] In some embodiments, the gas water heater can further comprise a burner and a main heat exchanger, the structure of which can refer to the related art, and will be specifically described in the embodiments of the second aspect. The burner produces flue gas after igniting the combustible gas, and the main heat exchanger is mainly used to absorb the sensible heat in the flue gas. For example, the generated flue gas can flow in the heat exchanger, and the heat of the flue gas is transferred to the liquid entering the main heat exchanger. Since the main heat exchanger is used to absorb the sensible heat in the flue gas, the temperature of the flue gas is still relatively high. In order to fully utilize the heat of the flue gas, the gas water heater of the embodiments of the present application further comprises a condensing heat exchanger. The flue gas produced after the combustible gas is ignited by the burner exchanges heat with the liquid in the main heat exchanger and the liquid in the condensing heat exchanger in turn. The condensing heat exchanger is used to absorb the sensible heat and latent heat in the flue gas after the main heat exchanger.

[0076] Figure 2 is a side view of the condenser heat exchanger of the embodiments of the present application. As shown in Figure 2 The condensing heat exchanger housing 101 comprises a first cavity 1011 and a second cavity 1012 which are in communication with each other. The first cavity 1011 and the second cavity 1012 can be integrally formed by housing injection molding, or can be separately injection molded and then connected (for example, welded) into one body. The first cavity 1011 and the second cavity 1012 are cuboids. In the X direction, the first cavity 1011 is located below the second cavity 1012, and the height of the first cavity 1011 is greater than the height of the second cavity 1012. In the Y direction, the width of the first cavity 1011 and the width of the second cavity 1012 are the same. In the Z direction, the width of the second cavity 1012 is greater than the width of the first cavity 1011. That is, in the Z direction, the second cavity at least partially protrudes in the transverse (Z) direction from the first cavity. That is, in the Z direction, the second cavity 1012 has a portion overlapping the first cavity 1011, and a protruding portion not overlapping the first cavity 1011. However, the embodiments of the present application are not limited thereto. For example, in the Z direction, the width of the second cavity 1012 is less than or equal to the width of the first cavity 1011, in the X direction, the height of the first cavity 1011 is less than or equal to the height of the second cavity 1012, and the like. Here, it will not be described one by one.

[0077] In some embodiments, as shown in Figure 1 and Figure 9As shown, a partition 1013 is arranged between the first cavity 1011 and the second cavity 1012, and a communication port 1014 for communicating the first cavity and the second cavity is arranged on the partition 1013. The partition 1013 can be integrally formed with the condensing heat exchanger shell 101, or can be arranged between the first cavity 1011 and the second cavity 1012 by splicing or welding, etc. The communication port 1014 is arranged in the middle region of the partition 1013, and can be circular or elliptical or other shapes, which are not limited by the embodiments of the present application. The flue gas flows through the first cavity 1011 and the second cavity 1012 in sequence after entering the condensing heat exchanger, that is, the flue gas enters the first cavity 1011 first, and then enters the second cavity 1012 through the communication port 1014.

[0078] In some embodiments, as shown in Figure 1 and Figure 2 and Figure 9 As shown, the condensing heat exchanger shell 101 is provided with a flue gas inlet in the transverse (Z) direction, wherein the flue gas inlet 1015 is arranged on the side wall of the condensing heat exchanger shell, and the flue gas outlet 1016 is arranged on the upper wall of the condensing heat exchanger shell. The flue gas enters the first cavity through the flue gas inlet, and then enters the second cavity through the communication port 1014, and then flows through the second cavity and is discharged from the flue gas outlet. For example, the flue gas inlet 1015 can be arranged on the side wall of the first cavity, which is located on the side of the protruding part of the first cavity close to the second cavity. The flue gas inlet can be square, but the embodiments of the present application are not limited thereto. The flue gas inlet is connected with the fan, and details are described in the embodiments of the second aspect. The flue gas outlet 1016 can be arranged on the upper wall of the second cavity, that is, on the side of the second cavity away from the first cavity. The flue gas outlet can be circular, but the embodiments of the present application are not limited thereto.

[0079] In some embodiments, the flue gas outlet can be located at the middle position of the upper wall of the second cavity or the position close to the side of the protruding part, as shown in Figure 1 As shown, the projection of the communication port 1014 and the flue gas outlet 1016 in the vertical direction is coincident or fully coincident, that is, the projection of the communication port 1014 and the flue gas outlet 1016 in the vertical direction is not completely staggered. Therefore, after the flue gas enters the second cavity from the first cavity through the communication port, at least part of the flue gas can be directly discharged from the flue gas outlet 1016 after heat exchange (because the flue gas path is short), thereby reducing the flue resistance of the second cavity.

[0080] In some embodiments, the area of the communication port is equal to or greater than the area of the smoke outlet port, thereby ensuring that the flow area of the flue gas is greater than or equal to the area of the smoke outlet port, which facilitates the smooth discharge of flue gas.

[0081] The structure of the shell is described above, and the heat exchange part in the shell is described below.

[0082] In some embodiments, as shown in Figure 1 The heat exchange part 102 is arranged in the first cavity 1011 and the second cavity 1012, and the heat exchange part 102 includes a first heat exchange part 1021 and a second heat exchange part 1022. The first heat exchange part 1021 is arranged in the first cavity 1011, and at least part of the second heat exchange part 1022 is arranged in the second cavity 1012. The first heat exchange part 1021 and the second heat exchange part 1022 are in communication, for example, the first heat exchange part 1021 and the second heat exchange part 1022 are composed of a pipe body. When the gas water heater is working, liquid flows in the pipe body, and the flue gas outside the pipe body can exchange heat with the liquid in the pipe body.

[0083] In some embodiments, the first heat exchange part has a first pipe body, and the second heat exchange part has a second pipe body. The first pipe body and the second pipe body are connected by a connecting part, or the first pipe body and the second pipe body (the first heat exchange part and the second heat exchange part) are formed by bending a same pipe body. Thereby, the liquid flow resistance is further reduced, and the embodiments of the present application are not limited thereto. The pipe body can be composed of a large pipe diameter (for example, the large pipe diameter is greater than 4 inch pipe) corrugated pipe. Through the large pipe diameter corrugated pipe, large flow of liquid can be achieved, and the liquid flow resistance in the pipe is reduced. In addition, the corrugated pipe can form a turbulent flow, so that the effects of self-cleaning, scale removal and scale prevention in the pipe can be achieved, but the embodiments of the present application are not limited thereto.

[0084] The structures of the first heat exchange part and the second heat exchange part are described below.

[0085] Figure 3 And Figure 10 is a schematic view of the heat exchange part 102 according to an embodiment of the present application, as shown in Figure 3 and Figure 10 The first heat exchange part 1021 includes a plurality of layers of pipe routes formed by a pipe body in a spiral shape at a position close to the inner circumferential wall in the first cavity. The heights of the pipe routes of different layers are different, that is, the first heat exchange part in the first cavity includes a plurality of layers of coils with different heights in the X direction (as shown in Figure 3 and Figure 10As shown, the multi-layer coil pipes 31, 32 and 33 are arranged in alignment in the different layers, but the present application is not limited thereto, for example, the pipes in different layers can be staggered (which can further reduce the resistance of smoke) and the like. In addition, the number of layers of the multi-layer coil pipes can be determined according to the height of the first cavity and the diameter of the first pipe, for example, in order to improve the heat exchange efficiency, the number of layers can be increased as much as possible under the condition that the first cavity can accommodate, but the present application is not limited thereto. In addition, the lengths of the pipes in different layers are the same or different, that is, the diameters of the circles surrounded by the pipes in different layers are the same or different. Since the volume of the first cavity is small, the space of the first cavity can be fully utilized by the spiral multi-layer pipes, thereby further improving the heat exchange efficiency.

[0086] In some embodiments, as shown in Figure 3 and Figure 10 part of the second heat exchange part is arranged in the second cavity, and part of the second heat exchange part is arranged in the first cavity, that is, the second heat exchange part 1022 includes a part of the pipe 10221 arranged in the second cavity 1012 and another part of the pipe 10222 arranged in the first cavity, wherein the part of the second heat exchange part arranged in the first cavity (that is, the other part of the pipe 10222) extends in the up-down direction, for example, the other part of the pipe 10222 extends in the up-down direction in the hollow space between the multi-layer coil pipes of the first heat exchange part, thereby reducing the flow resistance of the liquid in the pipe. The part of the second heat exchange part arranged in the second cavity (that is, the part of the pipe 10221) communicates with the other part of the pipe 10222, for example, the other part of the pipe 10222 and the part of the pipe 10221 are formed by bending the same pipe, or the other part of the pipe 10222 and the part of the pipe 10221 are connected through a connecting part, but the present application is not limited thereto.

[0087] In some embodiments, the other part of the pipe 10222 further includes a part of the pipe located in the second cavity, and the length of the other part of the pipe 10222 is approximately the same as the height of the first cavity and the second cavity, that is, the other part of the pipe 10222 extends upward from the lowermost end (lower wall) of the first cavity to the uppermost end (upper wall) of the second cavity in the aforementioned hollow space, and then communicates with the part of the pipe 10221 at the upper wall side of the second cavity.

[0088] In some embodiments, as shown in Figure 3 and Figure 10As shown, the second heat exchange part (part of the tube body 10221) arranged in the second cavity includes a first sub heat exchange part 34 and a second sub heat exchange part 35 at different heights, the first sub heat exchange part 34 is in communication with the second sub heat exchange part 35, and the first sub heat exchange part and the second sub heat exchange part are formed by a tube body, for example, the first sub heat exchange part 34 and the second sub heat exchange part 35 are formed by bending the same tube body, or the first sub heat exchange part 34 and the second sub heat exchange part 35 are connected by a connecting part 36.

[0089] In some embodiments, the first sub heat exchange part is above the second sub heat exchange part, and the connecting part 36 is formed by a tube body, and the bending part of the tube body is not more than two. As shown, Figure 3 As shown, the connecting part 36 is needed to connect the first sub heat exchange part and the second sub heat exchange part at different heights to make the liquid flow smoothly in the tube body. The bending part of the connecting part 36 is not more than two, as shown, Figure 3 As shown, the connecting part 36 includes bending parts 361 and 362, and one ends A and B of the first sub heat exchange part and the second sub heat exchange part in communication with each other are located at the same position in the second cavity (the positions in the Z direction and the Y direction are substantially the same, but the positions in the X direction are different, that is, the heights are different), the bending part 361 is in communication with the one end A, and the bending part 362 is in communication with the one end B, thereby facilitating assembly and further reducing the resistance of the flowing liquid.

[0090] In some embodiments, the arrangement of the tube body of the first sub heat exchange part is different from the arrangement of the tube body of the second sub heat exchange part. Figure 4 Fig. 2 is a top view of the heat exchange part 102 according to an embodiment of the present application, Figure 5 Fig. 3 is a bottom view of the heat exchange part 102 according to an embodiment of the present application, as shown, Figure 3 and Figure 4 As shown, the first sub heat exchange part is close to the lower wall of the second cavity, and includes multiple turns of tube lines 41, 42 and 43 formed by a tube body, the sizes of the turns of different turns of tube lines are different, and the tube lines of different turns are located at the same height. The innermost turn of tube line 41 is in communication with the upper end C of the other part of the tube body 10222, and one end A of the outermost turn of tube line 43 is in communication with the second sub heat exchange part (formed by the same tube, or connected by the connecting part 36). As shown, Figure 3 and Figure 5As shown, the second sub-heat exchange section is located near the upper lower wall of the second cavity and includes a first bent pipe 51 of the same height formed by a tube. This first bent pipe 51 may include a serpentine arrangement of the tube (multiple S-shaped bends), including multiple bends 511, 512, 513, etc., with different bends having the same or different curvatures. One end B of the edge pipe on one side of the first bent pipe 51 is connected to the aforementioned first sub-heat exchange section (formed from the same tube, or connected via a connecting part 36), and one end D of the edge pipe on the other side is connected to the first heat exchange section (formed from the same tube, or connected via a connecting part). Figure 3 As shown, the straight edge of the first bent pipe 51 extends along the Z direction, but it can also extend along the Y direction. This embodiment of the application does not limit it in this way.

[0091] In some embodiments, such as Figure 1 As shown, an opening 37 is provided on the partition 1013 between the first cavity and the second cavity. The tube of the first heat exchange section and the tube of the second heat exchange section located in the second cavity (a part of the tube 10221) are connected at the opening 37 (formed by the same tube or connected via a connecting part).

[0092] The following example, using the example of the first and second heat exchange sections being formed from the same tube, further illustrates the tube arrangement and method. This tube extends upwards from the bottom (lower wall) of the first cavity, through the aforementioned hollow space, to the top (upper wall) of the second cavity. Then, starting from the innermost coil, it coils around the upper wall of the second cavity, forming multiple coils at the same height. The coils of different sizes are then extended downwards to above the lower wall of the second cavity, forming a serpentine arrangement of a first bend at the same height (essentially the same height or completely the same height). One end D of the edge of the first bend enters the first cavity through an opening 37 on the separator. The first cavity forms a spiral multi-layered pipe system close to its inner circumferential wall. The pipes of different layers have different heights and finally extend from the lower wall of the first cavity. That is to say, both ends of the single pipe are located at the lower wall of the first cavity. The pipes between the two ends of the single pipe are arranged in the first and second cavities in the above manner. This non-reciprocating pipe arrangement in the height direction in the shell of the condenser heat exchanger can improve heat exchange efficiency, reduce liquid flow resistance, and prevent water accumulation in the pipes, thus avoiding drainage difficulties.

[0093] The first heat exchange part and the second heat exchange part are formed by the same pipe as an example, but the embodiments of the present application are not limited thereto. When the first heat exchange part and the second heat exchange part are formed by different pipes, they can be connected by different connecting parts. For example, part of the pipe 10221 and another part of the pipe 10222 need to be connected through the connecting part, the first sub heat exchange part and the second sub heat exchange part need to be connected through the connecting part, the second sub heat exchange part and the first heat exchange part need to be connected through the connecting part, and the like, which will not be described one by one here.

[0094] It should be noted that the arrangement of the pipe of the first sub heat exchange part and the arrangement of the pipe of the second sub heat exchange part are only examples, and the embodiments of the present application are not limited thereto. The arrangement of the pipe of the first sub heat exchange part and the arrangement of the pipe of the second sub heat exchange part can be different. For example, the first sub heat exchange part can be a same-height bending pipe formed by a pipe, and the second sub heat exchange part can be a multi-turn pipe formed by a pipe, and the like, which will not be described one by one here. In addition, the second heat exchange part in the second cavity includes two sub heat exchange parts of different heights as an example, but the embodiments of the present application are not limited thereto. For example, the second heat exchange part in the second cavity can include at least three sub heat exchange parts at different heights under the condition that the height of the second cavity can accommodate. The arrangement of the pipe of at least two sub heat exchange parts of the at least three sub heat exchange parts is different. Taking three sub heat exchange parts as an example, the uppermost sub heat exchange part is a multi-turn pipe formed by a pipe, the middle layer sub heat exchange part is a same-height bending pipe formed by a pipe, and the lowermost sub heat exchange part is a same-height bending pipe formed by a pipe, and the like, which will not be described one by one here.

[0095] Through the above embodiments, the pipe of the first heat exchange part and the pipe of the second heat exchange part in the second cavity adopt different arrangements. In addition, the pipe of the first sub heat exchange part and the pipe of the second sub heat exchange part adopt different arrangements. Therefore, the space in the first cavity and the second cavity is fully utilized for pipe arrangement, the heat exchange efficiency is improved, the liquid flow resistance is reduced, the water accumulation in the pipe is avoided, and the problem of difficult drainage does not exist.

[0096] The liquid flow path and the flue gas path in the condensing heat exchanger will be described in combination with the structure of the heat exchange part and the shell. The liquid and the flue gas can be directly heat exchanged, that is, the liquid flow path and the flue gas path are consistent, or the liquid and the flue gas can be inversely heat exchanged, that is, the liquid flow path and the flue gas path are opposite, which will be described respectively.

[0097] In some embodiments, as Figure 3 and Figure 10As shown, the first tube body as the first heat exchange part includes a first port 311 and a second port 312, and the second tube body as the second heat exchange part includes a third port 321 and a fourth port 322, wherein the second port 312 and the third port 321 are communicated, and the first port 311 and the fourth port 322 are used for flowing in and out of the liquid (cold liquid) respectively.

[0098] In some embodiments, when the heat exchange is in the forward direction, the liquid flowing through the first heat exchange part exchanges heat with the flue gas and then flows into the second heat exchange part. The first port 311 is the inlet of the first tube body and is used for flowing in of the liquid (cold liquid), and the fourth port 322 is the outlet of the second tube body and is used for flowing out of the liquid, that is, the flow path of the liquid is first from the first port 311 into the first heat exchange part, then into the second heat exchange part through the second port 312 and the third port 321, and finally out of the fourth port 322. More specifically, when entering the second heat exchange part, the liquid first flows through the part of the second heat exchange part located in the second cavity and then enters the part of the second heat exchange part located in the first cavity, that is, first enters one part of the tube body 10221 and then enters another part of the tube body 10222. More specifically, flowing through the part of the second heat exchange part located in the second cavity includes that the liquid first flows through the second sub heat exchange part and then flows into the first sub heat exchange part, that is, the liquid first enters the first heat exchange part, and then flows into the second sub heat exchange part, the first sub heat exchange part, and another part of the tube body 10222 in sequence, and finally out of the fourth port 322.

[0099] In this embodiment, the cold liquid first enters the first heat exchange part in the first cavity, and the high-temperature flue gas also first enters the first cavity. After heat exchange, the flue gas cooled down enters the second cavity, and the liquid heated up enters the second heat exchange part. The flue gas and the liquid are heat exchanged again to further reduce the temperature of the flue gas and further increase the temperature of the liquid, thereby further improving the heat exchange efficiency.

[0100] In some embodiments, the liquid flowing through the second heat exchange portion exchanges heat with the flue gas and then flows into the first heat exchange portion when the heat exchange is reversed. The fourth port 322 is the inlet of the second tube body for the inflow of the liquid (cold liquid), and the first port 311 is the outlet of the first tube body for the outflow of the liquid, that is, the flow path of the liquid is from the fourth port 322 into the second heat exchange portion, into the first heat exchange portion through the third port 321 and the second port 312, and finally outflows from the first port 311. More specifically, when entering the second heat exchange portion, the liquid first flows through the part of the second heat exchange portion located in the first cavity and then enters the part of the second heat exchange portion located in the second cavity, that is, first enters the other part of the tube body 10222 and then enters the part of the tube body 10221. More specifically, flowing through the part of the second heat exchange portion located in the second cavity includes that the liquid first flows through the first sub heat exchange portion and then flows into the second sub heat exchange portion, that is, the liquid first enters the other part of the tube body 10222, and then enters the first sub heat exchange portion, the second sub heat exchange portion and the first heat exchange portion in sequence and outflows from the first port.

[0101] In this embodiment, the cold liquid first enters the second heat exchange portion, the high-temperature flue gas first enters the first cavity and then flows into the second cavity, the flue gas flowing into the second cavity exchanges heat with the low-temperature cold liquid and then is discharged, the liquid after being heated enters the first heat exchange portion in the first cavity and exchanges heat with the high-temperature flue gas newly entering the first cavity, the temperature of the liquid is further increased, and the flue gas after being cooled enters the second cavity and exchanges heat with the newly flowing cold liquid. That is, the cold liquid first enters the second cavity and exchanges heat with the flue gas and then enters the first cavity and exchanges heat with the flue gas with a higher temperature, so that the liquid in the heat exchange portion always maintains a large heat exchange temperature difference with the flue gas, and the heat exchange efficiency can be further improved.

[0102] In some embodiments, in order to make the flue gas heat exchange more sufficient, the condensation heat exchanger can further be provided with a flow guide, which is described below.

[0103] In some embodiments, as shown in Figure 1 , the first cavity is provided with a flow guide 103 for guiding the flue gas entering the first cavity. Figure 6 is a schematic view of the flow guide of the present embodiment, as shown in Figure 1 and Figure 6As shown, the flow guide 103 includes a baffle 1031 extending in the longitudinal direction, and the smoke entering the first cavity from the smoke inlet 1015 changes the flow direction after being blocked by the baffle. That is, after the smoke enters the first cavity, the smoke path is changed by the blocking of the baffle 1031, and the smoke path is extended. In an ideal case, the smoke can fill the first cavity and then flow into the second cavity. Therefore, the smoke stays in the cavity for a longer time, the heat exchange of the smoke is more sufficient, and the heat exchange efficiency is further improved. On the other hand, the baffle can reduce the resistance of the smoke, and reduce the load of the front-stage fan. This will be described in the second aspect of the embodiment.

[0104] In some embodiments, as shown in Figure 1 and Figure 6 As shown, the baffle 1031 forms a cavity, the lower part of the cavity is provided with a smoke inlet 1032, the upper part of the cavity is provided with a smoke outlet 1033, and the smoke inlet 1032 is in communication with the smoke outlet 1033 through the cavity. The areas, sizes, and shapes of the smoke inlet, the smoke outlet, and the communication port are the same or different. The smoke outlet 1033 is in communication with the communication port 1014 on the partition (for example, through a connecting portion). Alternatively, the smoke outlet is the communication port, or the communication port is the smoke outlet.

[0105] In some embodiments, the flow guide is in a cylindrical shape, and the cross-sectional area of the cylindrical shape is greater than or equal to the area of the smoke outlet. Thus, the flow area of the smoke is greater than or equal to the area of the smoke outlet, which is beneficial for the smooth discharge of the smoke. For example, the baffle 1031 forms a cylinder, the inside of the cylinder forms a cavity, and the two ends of the cylinder are the smoke outlet and the smoke inlet. The baffle forms a cylinder, and the baffle is made of stainless steel or PPS and glass fiber material. The flow guide can be integrally formed with the shell, or separately formed and then assembled. Compared with the integrally formed flow guide, the structure of the integrally formed flow guide is more stable, the smoke path and the heat exchange effect are more stable, no additional assembly is required, and the process is relatively simple. In addition, the flow guide can also have other shapes, such as a cone, a cuboid, or an elliptical cylinder, and the embodiments of the present application are not limited in this regard.

[0106] In some embodiments, when the smoke outlet is the communication port, the upper edge of the baffle can be arranged along the outer circumferential side of the communication port, and the baffle extends downward. In addition, the lower edge of the baffle is lower than the lower edge of the smoke inlet 1015. Thus, the smoke path can be extended to a greater extent.

[0107] In some embodiments, the inner surface of the aforementioned condensing heat exchanger shell has a gap between the baffle, and at least the first heat exchange portion is arranged in the gap. Alternatively, as mentioned above, the first heat exchange portion can be arranged in multiple layers of coils with different heights along the inner surface of the first cavity, and the baffle is arranged in the hollow space formed between the multiple layers of coils. In this way, the flue gas path can be extended, and the space inside the condensing heat exchanger shell can be fully utilized, thereby reducing the volume of the condensing heat exchanger shell and further reducing the volume of the gas heat exchange device.

[0108] In some embodiments, as shown in Figure 6 At least one through hole 61 is arranged on the baffle for splitting a small portion of the flue gas, so that the small portion of the flue gas entering the first cavity directly enters the hollow space formed by the baffle, and then enters the second cavity through the communication port. In this way, the flue gas resistance can be further reduced, and the smooth flue gas exhaust effect and the sufficient heat exchange effect can be achieved. The number of the at least one through hole 61 is not limited in the embodiments of the present application, for example, multiple rows of through holes can be uniformly arranged in the circumferential and longitudinal directions of the baffle, and the like, which will not be illustrated one by one here.

[0109] The flue gas path after the flue gas enters the condensing heat exchanger with the flow guide is described again below in combination with the structure of the flow guide (as shown by the arrows in Figure 1 Figure 1 As shown in Figure 1 After the flue gas enters the first cavity from the flue gas inlet 1015 on the side wall of the first cavity, a small portion of the flue gas directly enters the hollow space formed by the baffle through the through hole on the baffle of the flow guide, and most of the flue gas changes the flow direction after being blocked by the flow guide, and then flows to the flue gas inlet of the flow guide. The flue gas enters the hollow space formed by the baffle from the flue gas inlet, and then enters the second cavity from the flue gas outlet (communication port). After entering the second cavity, the flue gas is diffused and finally discharged from the flue gas outlet.

[0110] As can be seen from the above embodiments, by arranging double cavities in the condensing heat exchanger and arranging heat exchange portions in each cavity, the heat exchange efficiency can be improved, the flow resistance of the fluid in the condensing heat exchanger is small, the processing cost is low, and the assembly is simple.

[0111] In addition, through reverse heat exchange, the cold liquid enters the second cavity first and exchanges heat with the flue gas, and then enters the first cavity and exchanges heat with the flue gas with a higher temperature. In this way, the liquid in the heat exchange portion always maintains a large heat exchange temperature difference with the flue gas, and the heat exchange efficiency can be further improved.

[0112] In addition, by designing the flow guide, the residence time of the flue gas in the cavity is prolonged, the flue gas heat exchange is more sufficient, and the heat exchange efficiency is further improved. On the other hand, the baffle can reduce the resistance of the flue gas and reduce the load of the front-stage fan.

[0113] ​In addition, the pipe body of the first heat exchange part and the pipe body of the second heat exchange part in the second cavity adopt different arrangement modes, and the non-reciprocal pipe arrangement mode in the height direction in the shell of the condensing heat exchanger can improve the heat exchange efficiency, reduce the liquid flow resistance, avoid water accumulation in the pipe, and avoid the problem of difficult drainage.

[0114] In addition, the lower edge of the baffle is lower than the lower edge of the smoke inlet, thereby maximizing the smoke path, and at least one through hole is arranged on the baffle, thereby further reducing smoke resistance.

[0115] Embodiments of the second aspect

[0116] Embodiments of the second aspect of the application provide a gas water heater. Figure 7 is a schematic diagram of a gas water heater according to an embodiment of the application. As shown in Figure 7 the gas water heater 700 comprises the condensing heat exchanger 701 according to the first aspect, and the structure of the condensing heat exchanger can refer to the first aspect, which will not be repeated here.

[0117] In some embodiments, the gas water heater further comprises a burner 702, a main heat exchanger 703 for the gas water heater located above the burner 702, and a fan 704, wherein the flue gas generated by the burner sequentially flows through the main heat exchanger 703, the air inlet 72 of the fan 704, and the air outlet 73 of the fan 704, and then enters the condensing heat exchanger 701. The air outlet of the fan 704 can be connected to the smoke inlet 1015 of the condensing heat exchanger 701 through an adapter 71, or can be directly connected to the smoke inlet 1015. That is, the air outlet of the fan is in communication with the first cavity through the smoke inlet.

[0118] In some embodiments, the burner 702 is used to mix and burn gas and air. When ignited, the high-temperature flue gas generated by the mixed combustion of gas and air. Specifically, the burner can include a plurality of parallel arranged fire rows, and the plurality of fire rows can be mounted on a mounting seat. Of course, the structure, form, etc. of the burner can be different according to different actual use scenarios, and the application does not make specific limitations here. The upper portion of the burner 702 is provided with a main heat exchanger 703, and the structure of the main heat exchanger 703 is not limited in the embodiments of the application. The fan 704 is arranged above the main heat exchanger 703, and the fan 704 provides the required amount of air for combustion by air extraction. The inside of the burner is always in a negative pressure state. In addition, the high-temperature flue gas (such as Figure 7 the coarse arrow) generated by the combustion of the burner enters the main heat exchanger and then the condensing heat exchanger in sequence after being extracted by the fan 704, and is discharged from the smoke outlet after heat exchange.

[0119] In some embodiments, the gas water heater can further include a motor 708 above the fan, and a gas valve and related pipeline 709 below the burner 702, the structure of which can refer to the related art, which will not be described here.

[0120] The following describes the liquid flow path structure of the gas water heater.

[0121] In some embodiments, as Figure 7 As shown by the fine arrows, the gas water heater further includes an inlet 705 and an outlet 706, the liquid entering the inlet 705 flows through the condensing heat exchanger 701 and the main heat exchanger 703 in sequence, and then flows out of the outlet 706. The inlet 705 is connected with a water pump and a water pipe, and the cold liquid entering the inlet 705 enters the condensing heat exchanger 701 (through the first port or the fourth port) via the water pump and the water pipe, and after heat exchange with the flue gas, the obtained warm liquid flows out of the condensing heat exchanger 701 (through the fourth port or the first port), enters the main heat exchanger 703 to exchange heat with the flue gas, and then the high-temperature liquid flows out of the outlet 706. In addition, the condensing heat exchanger 701 is used to absorb the sensible heat and latent heat of the flue gas after the main heat exchange, and after absorbing the latent heat, the condensed liquid is discharged via the pipe body and the liquid seal device 707.

[0122] The following describes the liquid and flue gas heat exchange mode of the gas water heater in combination with the above structure.

[0123] In some embodiments, the high-temperature flue gas generated by the burner enters the main heat exchanger after being drawn by the fan 704, and exchanges heat with the liquid in the main heat exchanger. The main heat exchanger is used to absorb the sensible heat of the flue gas, and after heat exchange, the flue gas temperature can be reduced to about 190°. In addition, the liquid in the main heat exchanger is the warm liquid flowing out of the condensing heat exchanger, that is, in the main heat exchanger, the warm liquid exchanges heat with the high-temperature flue gas, the warm liquid becomes high-temperature liquid and is discharged from the outlet, and the cooled flue gas (first cooling) enters the condensing heat exchanger via the fan, and exchanges heat again with the cold liquid in the condensing heat exchanger according to the mode in the foregoing embodiments. The condensing heat exchanger is used to absorb the sensible heat and latent heat of the flue gas, and the flue gas temperature is reduced again to 70-100° (second cooling). The cold liquid entering the condensing heat exchanger from the water inlet is changed into warm liquid after heat exchange and enters the main heat exchanger, that is, in the condensing heat exchanger, the cold liquid exchanges heat with the cooled flue gas (first cooling), the cold liquid becomes warm liquid and flows out of the condensing heat exchanger, and the once-cooled flue gas becomes twice-cooled flue gas and is discharged from the condensing heat exchanger. Thus, the liquid always maintains a large heat exchange temperature difference with the flue gas, which can further improve the heat exchange efficiency.

[0124] In some embodiments, at least a portion of the fan is disposed between the main heat exchanger and the condensing heat exchanger. As described in the previous embodiment, the second cavity protrudes at least partially from the first cavity in the lateral direction; at least a portion of the fan is disposed between the main heat exchanger and the second cavity. The fan is located above the main heat exchanger, and the portion of the second cavity protruding from the first cavity (the protrusion) is located above at least a portion of the fan. That is, a portion of the fan is sandwiched between the main heat exchanger and the protrusion of the second cavity. By providing the protrusion, heat exchange piping can be arranged within the space of the protrusion, ensuring heat exchange efficiency. Furthermore, the aforementioned positional relationship between the condensing heat exchanger and the fan, especially the positional relationship between the protrusion, the fan, and the main heat exchanger, allows for a more compact internal structure of the gas-fired water heater.

[0125] In some embodiments, such as Figure 7 As shown, the fan is horizontally positioned on the gas water heater, with the fan inlet facing the main heat exchanger and the fan outlet horizontally positioned.

[0126] Figure 8 This is a schematic diagram of a gas-fired water heater according to an embodiment of this application. Figure 7 The similarities will not be repeated here, such as Figure 7 The difference lies in the fact that the fan is tilted relative to the gas water heater. The portion E of the fan near the condensing heat exchanger is higher than the portion F of the fan away from the condensing heat exchanger. Furthermore, the motor located above the fan is also tilted. Because the fan and motor are tilted, the space above the gas water heater is increased, allowing for a suitable increase in the volume of the second chamber. The motor no longer obstructs the middle position above the gas water heater, thus enabling the exhaust port 1016 of the condensing heat exchanger to be located in or near the middle of the gas water heater, thereby facilitating assembly. Additionally, to support this tilted fan configuration, the arrangement of the gas valve and related pipes 709 can be altered; however, this embodiment is not intended to limit the scope of the invention.

[0127] In some embodiments, the gas-fired water heating device includes a gas-fired boiler. It is worth noting that the gas-fired water heating device may also include components not shown in the figure. For reference, please refer to related technologies. Examples will not be listed here.

[0128] The apparatuses described in connection with the embodiments disclosed herein can be directly implemented as hardware, executed by a processor through a software module or a combination of the two. For example, one or more of the functional blocks shown in the figures and / or a combination of one or more of the functional blocks can correspond to individual software modules of a computer program flow or individual hardware modules. These hardware modules can be implemented, for example, by using a field programmable gate array (FPGA) to solidify the software modules.

[0129] The software modules can be located in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a mobile disk, a CD-ROM, or any other form of storage medium known in the art. A storage medium can be coupled to the processor, so that the processor can read information from the storage medium and write information to the storage medium; or the storage medium can be an integral part of the processor. The processor and the storage medium can be located in an ASIC. The software modules can be stored in the memory of the information processing system, or in a storage card that can be inserted into the information processing system.

[0130] One or more of the functional blocks shown in the figures and / or a combination of one or more of the functional blocks can be implemented as a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any appropriate combination thereof, for performing the functions described herein. One or more of the functional blocks shown in the figures and / or a combination of one or more of the functional blocks can also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in communication with a DSP core, or any other such configuration.

[0131] The embodiments of the present application described above are merely exemplary and are not intended to limit the scope of the present application. Those skilled in the art can make various modifications and variations to the present application based on the spirit and principles of the present application, and such modifications and variations are also within the scope of the present application.

Claims

1. A condensing heat exchanger for a gas-fired water heating appliance, characterized in that, The condensing heat exchanger comprises: a condensing heat exchanger housing comprising a first cavity and a second cavity in communication with each other, flue gas generated by a burner of the gas water heater sequentially flows through the first cavity and the second cavity after entering the condensing heat exchanger; a heat exchange part arranged in the first cavity and the second cavity, for heat exchange between liquid flowing through the heat exchange part and flue gas after heat exchange with liquid in the main heat exchanger of the gas water heater; the heat exchange part comprises a first heat exchange part and a second heat exchange part, the first heat exchange part is arranged in the first cavity, and at least part of the second heat exchange part is arranged in the second cavity; wherein a flow guide is arranged in the first cavity, the flow guide is used for guiding the flue gas entering the first cavity; the flow guide comprises a baffle extending in the longitudinal direction, the baffle surrounds a cavity, the lower part of the cavity is provided with a flue gas inlet, the upper part of the cavity is provided with a flue gas outlet, the flue gas inlet is communicated with the flue gas outlet through the cavity, and at least one through hole is arranged on the baffle, wherein part of the flue gas entering the first cavity directly enters the cavity through the through hole and then enters the second cavity, and the other part of the flue gas entering the first cavity changes the flow direction after being blocked by the flow guide, then flows to the flue gas inlet, enters the cavity from the flue gas inlet, and then enters the second cavity; there is a gap between the inner surface of the condensing heat exchanger housing and the baffle, and at least the first heat exchange part is arranged in the gap, wherein the first heat exchange part is arranged close to the inner surface of the first cavity and forms a hollow space therebetween, and the baffle is arranged in the hollow space.

2. The condensing heat exchanger for a gas water heating device according to claim 1, characterized by, The liquid flowing through the second heat exchange part flows into the first heat exchange part after heat exchange with the flue gas.

3. The condensing heat exchanger for the gas water heater according to claim 2, wherein part of the second heat exchange part is arranged in the second cavity, and part of the second heat exchange part is arranged in the first cavity, and the liquid first flows through the part of the second heat exchange part in the first cavity and then flows into the part of the second heat exchange part in the second cavity.

4. The condensing heat exchanger for the gas water heater according to claim 3, wherein the first heat exchange part has a first pipe body, the second heat exchange part has a second pipe body, the inlet of the second pipe body is used for flowing into the liquid, the outlet of the second pipe body is connected with the inlet of the first pipe body, and the outlet of the first pipe body is used for flowing out of the liquid.

5. The condensing heat exchanger for the gas water heater according to claim 2, wherein the part of the second heat exchange part arranged in the second cavity comprises a first sub heat exchange part and a second sub heat exchange part at different heights, the first sub heat exchange part and the second sub heat exchange part are communicated, so that the liquid first flows through the first sub heat exchange part and then flows into the second sub heat exchange part.

6. The condensing heat exchanger for the gas water heater according to claim 1, wherein The liquid flowing through the first heat exchange portion exchanges heat with the flue gas and then flows into the second heat exchange portion.

7. The condensing heat exchanger for a gas water heater according to claim 6, wherein Part of the second heat exchange portion is arranged in the second cavity and part of the second heat exchange portion is arranged in the first cavity, and the liquid flows through the part of the second heat exchange portion arranged in the second cavity first and then flows into the part of the second heat exchange portion arranged in the first cavity.

8. The condensing heat exchanger for a gas water heater according to claim 7, wherein The first heat exchange portion has a first pipe body, and the second heat exchange portion has a second pipe body, the inlet of the first pipe body is used for flowing in the liquid, the inlet of the second pipe body is connected with the outlet of the first pipe body, and the outlet of the second pipe body is used for flowing out the liquid.

9. The condensing heat exchanger for a gas water heater according to claim 6, wherein The part of the second heat exchange portion arranged in the second cavity comprises a first sub-heat exchange portion and a second sub-heat exchange portion arranged at different heights, and the first sub-heat exchange portion and the second sub-heat exchange portion are connected to allow the liquid to flow through the second sub-heat exchange portion first and then flow into the first sub-heat exchange portion.

10. The condensing heat exchanger for a gas water heater according to claim 3 or 7, wherein The first cavity is arranged below the second cavity, and the part of the second heat exchange portion arranged in the first cavity extends in the up-down direction.

11. The condensing heat exchanger for a gas water heater according to claim 1, wherein The first heat exchange portion and the second heat exchange portion are formed by bending the same pipe body.

12. The condensing heat exchanger for a gas water heater according to claim 5 or 9, wherein The first sub-heat exchange portion and the second sub-heat exchange portion are formed by pipe bodies, and the arrangement of the pipe bodies of the first sub-heat exchange portion is different from the arrangement of the pipe bodies of the second sub-heat exchange portion.

13. The condensing heat exchanger for a gas water heater according to claim 5 or 9, wherein The first sub-heat exchange portion comprises multiple turns of pipe routes formed by pipe bodies, and the sizes of the turns of different turns of pipe routes are different.

14. The condensing heat exchanger for a gas water heater according to claim 5 or 9, wherein The second sub-heat exchange portion comprises first bent pipe routes formed by pipe bodies at the same height.

15. The condensing heat exchanger for a gas water heater according to claim 5 or 9, wherein The first sub-heat exchange portion is arranged above the second sub-heat exchange portion, the first sub-heat exchange portion and the second sub-heat exchange portion are connected through a connecting portion, the connecting portion is formed by a pipe body, and the number of bends of the pipe body is not more than 2.

16. The condensing heat exchanger for a gas water heater according to claim 1, wherein The first heat exchange portion comprises multiple layers of pipe routes formed by pipe bodies in a spiral shape, and the heights of different layers of pipe routes are different.

17. The condensing heat exchanger for a gas water heater according to claim 16, wherein The different layers of pipes are arranged in alignment or misalignment.

18. The condensing heat exchanger for a gas water heater according to claim 1, wherein the condensing heat exchanger housing is provided with a smoke inlet in a lateral direction, and the smoke entering the first cavity from the smoke inlet is changed in flow direction after being blocked by the baffle.

19. The condensing heat exchanger for a gas water heater according to claim 1, wherein the condensing heat exchanger housing is provided with a smoke outlet in a lateral direction, and the smoke entering the first cavity from the smoke inlet is changed in flow direction after being blocked by the baffle.

20. The condensing heat exchanger for a gas water heater according to claim 18, wherein a lower edge of the baffle is lower than a lower edge of the smoke inlet.

21. The condensing heat exchanger for a gas water heater according to claim 1, wherein the flow guide is in a cylindrical shape.

22. The condensing heat exchanger for a gas water heater according to claim 1, wherein the first cavity is located below the second cavity.

23. The condensing heat exchanger for a gas water heater according to claim 22, wherein the condensing heat exchanger housing is further provided with a smoke inlet in a lateral direction, and the condensing heat exchanger housing is provided with a smoke outlet in an upper wall, and the smoke enters the first cavity from the smoke inlet, and then flows through the second cavity and is discharged from the smoke outlet.

24. The condensing heat exchanger for a gas water heater according to claim 23, wherein a partition is provided between the first cavity and the second cavity, and the partition is provided with a communication opening for communicating the first cavity and the second cavity, and the smoke outlet communicates with a projection of the communication opening in a vertical direction or all of the projection.

25. The condensing heat exchanger for a gas water heater according to claim 24, wherein an area of the communication opening is equal to or greater than an area of the smoke outlet.

26. A gas water heater comprising the condensing heat exchanger for a gas water heater according to any one of claims 1 to 25.

27. The gas water heater according to claim 26, further comprising a burner, a main heat exchanger for a gas water heater located above the burner, the condensing heat exchanger, and a fan, and the smoke generated by the burner sequentially flows through the main heat exchanger, an air inlet of the fan, an air outlet of the fan, and the condensing heat exchanger.

28. The gas water heater according to claim 27, further comprising a liquid inlet and a liquid outlet, and the liquid entering from the liquid inlet sequentially flows through the condensing heat exchanger and the main heat exchanger, and then flows out from the liquid outlet.

29. The gas water heater according to claim 27, wherein at least part of the fan is located between the main heat exchanger and the condensing heat exchanger.

24. The condensing heat exchanger for a gas-fired water heating device according to claim 23, wherein 30. The gas water heater according to claim 29, wherein the second cavity at least partially protrudes from the first cavity in a lateral direction, and at least part of the fan is located between the main heat exchanger and the second cavity.

25. The condensing heat exchanger for a gas-fired water heating device according to claim 24, wherein 31. The gas water heater according to claim 30, wherein the fan is located above the main heat exchanger, and the part of the second cavity protruding from the first cavity is located above at least part of the fan.

26. A gas water heating apparatus characterised by ​ 27. The gas water heating apparatus according to claim 26 wherein, ​ 28. The gas water heating apparatus according to claim 27 wherein, ​ 29. The gas water heating apparatus according to claim 27 wherein, ​ ​ ​ ​ 31. The gas water heating apparatus according to claim 30, wherein ​ 32. The gas water heating apparatus according to claim 31 wherein, The second cavity is located above the first cavity, the first cavity is provided with a smoke inlet, and an air outlet of the fan is communicated with the first cavity through the smoke inlet.

33. The gas-fired water heating device of claim 27, wherein, The fan is transversely arranged in the gas water heater, an air inlet of the fan faces the main heat exchanger, and an air outlet of the fan is transversely arranged.

34. The gas-fired water heating appliance of claim 27, wherein, The fan is obliquely arranged in the gas water heater.

35. The gas water heating apparatus according to claim 34 wherein, A part of the fan close to the condensation heat exchanger is higher than a part of the fan away from the condensation heat exchanger.

36. The gas water heating apparatus according to claim 35 wherein, The air outlet of the fan is connected with the condensation heat exchanger through an adapter.

37. The gas-fired water heating appliance of claim 34, wherein, The smoke outlet of the condensation heat exchanger is located in the middle of the gas water heater or arranged close to the middle of the gas water heater.

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