Condensing heat exchanger structure with flow guide function and gas water heater

Abstract

The utility model provides a condensing heat exchanger structure with a diversion function and a gas water heater, the condensing heat exchanger structure comprises a partition plate with a U-shaped cross section, and a secondary heat exchanger is arranged in the partition plate; smoke inlets are formed in the two sides of the partition plate; side sealing plates are arranged at the two ends of the partition plate, an upper sealing plate is arranged at the top of the partition plate, and the second-stage heat exchanger is wrapped in the upper sealing plate; the upper sealing plate is provided with a smoke outlet; the secondary heat exchanger comprises a first flat pipe and a second flat pipe; one side of the first flat pipe and one side of the second flat pipe are located above the smoke inlet, and the other side of the first flat pipe and the other side of the second flat pipe extend towards the bottom face of the partition plate and form a gap with the bottom face of the partition plate. According to the condensing heat exchanger structure with the flow guide function and the gas water heater, high-temperature smoke can be guided, so that the heat exchange efficiency between the high-temperature smoke and the condensing heat exchanger is improved, energy waste is reduced, and the use cost of a user is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of water heaters, in particular to a condensing heat exchanger structure with a flow guiding function and a gas water heater. Background Art

[0002] With the continuous progress of society, energy conservation and environmental protection have gradually become the direction advocated by the society. Especially for household appliances that users often use, the energy efficiency level is one of the important factors that determine consumers' willingness to buy. As a high-efficiency gas combustion equipment, condensing gas water heaters have great energy-saving potential. Compared with ordinary gas water heaters, condensing gas water heaters add a latent heat exchanger (i.e., condensing heat exchanger) above the sensible heat exchanger (i.e., the primary heat exchanger), which can fully absorb the heat of high-temperature flue gas and improve the heat exchange efficiency of the whole machine by more than 10%. However, the heat exchange efficiency between the high-temperature flue gas and the condensing heat exchanger of the current condensing gas water heater is still unsatisfactory, resulting in a large waste of energy and high user costs.

[0003] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Utility Model Content

[0004] The purpose of the utility model is to provide a condensing heat exchanger structure with a guiding function, which can guide the high-temperature flue gas to improve the heat exchange efficiency between the flue gas and the condensing heat exchanger, thereby reducing energy waste and lowering the user's usage cost.

[0005] Another object of the utility model is to provide a gas water heater, which includes the above-mentioned condensing heat exchanger structure with a diversion function, which can guide the high-temperature flue gas to improve the heat exchange efficiency between it and the condensing heat exchanger, thereby reducing energy waste and reducing users' usage costs.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A condensing heat exchanger structure with a flow diversion function comprises a partition with a U-shaped cross-section, a secondary heat exchanger is arranged inside the partition; smoke inlets are arranged on both sides of the partition; side sealing plates are arranged at both ends of the partition, and an upper sealing plate is arranged on the top of the partition to cover the secondary heat exchanger; the upper sealing plate is provided with a smoke exhaust port; the secondary heat exchanger comprises a first flat tube and a second flat tube; one side of the first flat tube and the second flat tube is located above the smoke inlet, and the other side extends to the bottom surface of the partition and has a gap between the bottom surface of the partition.

[0008] According to one embodiment of the utility model, a downward guide groove is provided in the middle of the upper sealing plate; one end of the side wall of the guide groove is located above the smoke inlet, and the other end extends toward the bottom surface of the partition and has a gap between the bottom surface of the partition.

[0009] According to an embodiment of the utility model, the smoke exhaust port is arranged at the bottom of the guide groove.

[0010] According to one embodiment of the utility model, the secondary heat exchanger also includes a heat exchange guide fin, which includes a first plate body and a second plate body, which are respectively sleeved on the outer periphery of the first flat tube and the second flat tube, and correspond to the shape of the first flat tube and the second flat tube; the first plate body and the second plate body are connected by a third plate body.

[0011] According to one embodiment of the utility model, the side sealing plate is provided with a first long hole and a second long hole corresponding to the pipe openings of the first flat tube and the second flat tube; the pipe openings of the first flat tube and the second flat tube are respectively inserted in the first long hole and the second long hole; a connecting plate is provided on the outer side of the side sealing plate, and the connecting plate is provided with a third long hole and a fourth long hole corresponding to the pipe openings of the first flat tube and the second flat tube; the pipe openings of the first flat tube and the second flat tube are respectively fixedly connected to the inner walls of the third long hole and the fourth long hole; a sealing plate corresponding to the shape of the connecting plate is provided on the outer side of the connecting plate, and a first connecting cavity and a second connecting cavity corresponding to the third long hole and the fourth long hole are respectively provided on the outer side of the sealing plate; on one of the sealing plates, the first connecting cavity is connected to the water inlet joint, and the second connecting cavity is connected to the water outlet joint.

[0012] According to one embodiment of the utility model, a condensate water interface is provided at the bottom end of the side sealing plate, and the condensate water interface is connected to the condensate water collecting device through a condensate water discharge pipe.

[0013] According to one embodiment of the utility model, the condensate collection device includes a tank body, a first baffle is provided inside the tank body, the first baffle extends upward from the bottom of the tank body and there is a gap between the free end of the first baffle and the top of the tank body, the first baffle divides the inside of the tank body into a first zone and a second zone connected at the top, a condensate inlet is provided at the top of the tank body, and a condensate outlet is provided at the bottom of the second zone; a second baffle is provided at the top of the second zone extending toward the bottom of the first zone, there is a gap between the free end of the second baffle and the bottom of the tank body, and the second baffle is spaced apart from the first baffle; a water level detection device is provided at the top of the first zone.

[0014] According to one embodiment of the utility model, the condensing heat exchanger structure with a flow guiding function also includes a cylinder formed by connecting a plurality of side plates, and a top plate is provided on the top of the cylinder; a corresponding first mounting slot is provided on the top of a group of side plates opposite to the cylinder, and a second mounting slot corresponding to the first mounting slot is provided on the top plate; the partition is provided between the two first mounting slots to separate the cylinder into an upper area and a lower area; a first-level heat exchanger is provided in the lower area, and a second-level heat exchanger is provided in the upper area; the first-level heat exchanger includes a plurality of first heat exchange tubes and heat exchange fins; the heat exchange fins are inverted U-shape, and the first heat exchange tubes are passed through the heat exchange fins.

[0015] According to an embodiment of the utility model, the side plate includes a cover plate and an inner plate, and an air cooling channel is formed between the cover plate and the inner plate, and the air cooling channel is connected to the air supply system.

[0016] The utility model also provides a gas water heater, comprising the above-mentioned condensing heat exchanger structure with flow guiding function.

[0017] Compared with the prior art, the advantages and beneficial effects of the embodiments of the present invention are:

[0018] The condensing heat exchanger structure and gas water heater with diversion function provided by the embodiment of the utility model are basically closed areas in the partition where the secondary heat exchanger is located, and are only provided with a smoke inlet and a smoke exhaust port for discharging the smoke after the heat exchange is completed, which prolongs the contact and heat exchange time between the high-temperature smoke and the secondary heat exchanger and improves the heat exchange efficiency. In addition, the first flat tube and the second flat tube of the secondary heat exchanger can guide the high-temperature smoke entering from the smoke inlet of the partition to the bottom end of the secondary heat exchanger, so that it can fully exchange heat with the secondary heat exchanger, further improve the heat exchange efficiency, and reduce the user's use cost. In addition, after the high-temperature smoke flows into the partition, it will flow through the secondary heat exchanger along the diversion direction of the first flat tube and the second flat tube, and its flow direction is consistent with the flow direction of the condensed water formed after the smoke heat exchange, thereby achieving the effect of reducing the smoke exhaust resistance. The enclosed area formed by the partition serves as a cavity for heat exchange between the high-temperature flue gas and the secondary heat exchanger. Smoke inlets are provided on the front and rear sides. After the high-temperature flue gas has exchanged heat in the primary heat exchanger below, it flows in from the front and rear smoke inlets of the partition respectively, thereby realizing the functional characteristics of double flow channels, increasing the amount of flue gas entering, and further improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. Among them:

[0020] Figure 1 A schematic structural diagram of a condensing heat exchanger structure with a flow guiding function provided by an embodiment of the utility model;

[0021] Figure 2 A schematic structural diagram of a secondary heat exchanger of a condensing heat exchanger structure with a flow guiding function provided by an embodiment of the utility model;

[0022] Figure 3 A schematic structural diagram of a partition of a condensing heat exchanger structure with a flow guiding function provided by an embodiment of the utility model;

[0023] Figure 4 A schematic structural diagram of an upper sealing plate of a condensing heat exchanger structure with a flow guiding function provided by an embodiment of the utility model;

[0024] Figure 5 A schematic structural diagram of a condensate water collecting device of a condensation heat exchanger structure with a flow guiding function provided by an embodiment of the utility model;

[0025] Figure 6 A schematic diagram of the installation of a primary heat exchanger and a secondary heat exchanger of a condensing heat exchanger structure with a flow guiding function provided in an embodiment of the utility model;

[0026] Figure 7 A schematic structural diagram of a cylinder of a condensing heat exchanger structure with a flow guiding function provided by an embodiment of the utility model;

[0027] Figure 8 A schematic diagram of the pipe connections of the primary heat exchanger and the secondary heat exchanger of the condensing heat exchanger structure with a flow guiding function provided in an embodiment of the utility model;

[0028] Fig. 9 A schematic structural diagram of a side plate of a condensing heat exchanger structure with a flow guiding function provided in an embodiment of the utility model.

[0029] Description of reference numerals:

[0030] 1. Partition plate; 11. Smoke inlet; 12. Side sealing plate; 121. First long hole; 122. Second long hole; 13. Upper sealing plate; 131. Smoke outlet; 132. Guide groove; 14. Connecting plate; 141. Third long hole; 142. Fourth long hole; 15. Sealing plate; 151. First connecting cavity; 152. Second connecting cavity; 2. Secondary heat exchanger; 21. First flat tube; 22. Second flat tube; 23. Heat exchange guide fin; 231. First sheet; 232. Second sheet; 233. Third sheet; 234. Smoke dispersion hole; 24. Connecting pipe; 25. Water inlet pipe; 3. Water inlet joint; 4 , water outlet joint; 5, condensate water interface; 6, condensate water discharge pipe; 7, condensate water collecting device; 71, first baffle; 711, first zone; 712, second zone; 72, condensate water inlet; 73, condensate water outlet; 74, second baffle; 75, water level detection device; 76; sewage outlet; 8, cylinder; 81, side plate; 811, first installation slot; 812, cover plate; 813, inner plate; 814, air-cooled flow channel; 82, top plate; 821, second installation slot; 83, upper zone; 84, lower zone; 9, primary heat exchanger; 91, water outlet pipe; 92, first heat exchange tube; 93, heat exchange fin. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention includes such modifications and variations within the scope of the appended claims and their equivalents.

[0032] In the description of the present invention, "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprising" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but do not exclude other elements or objects. The directions or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "connected", "connected" and "set" used in the present invention should be understood in a broad sense, for example, they can be fixedly connected or detachably connected; they can be directly connected or indirectly connected through an intermediate component; they can be wired electrical connections, radio connections, or wireless communication signal connections. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0033] like Figure 1-Figure 4 As shown, the embodiment of the utility model provides a condensing heat exchanger structure with a flow guiding function, including a partition plate 1 with a U-shaped cross section, and a secondary heat exchanger 2 is arranged in the partition plate 1. For the sake of clarity, the definition Figure 6 The top of the middle is the top. Figure 6 The lower part in the figure is the lower part. Smoke inlets 11 are provided on both sides of the partition 1 for high-temperature flue gas to enter the partition 1 from the combustion space below and exchange heat with the secondary heat exchanger 2. Side sealing plates 12 are provided at both ends of the partition 1, and an upper sealing plate 13 is provided on the top of the partition 1 to form a closed area and wrap the secondary heat exchanger 2 therein, so that the high-temperature flue gas and the secondary heat exchanger 2 are in full contact for heat exchange, thereby improving the heat exchange efficiency. The upper sealing plate 13 is provided with a smoke exhaust port 131, which is used to discharge the flue gas that has completed the heat exchange with the secondary heat exchanger 2. The secondary heat exchanger 2 includes a first flat tube 21 and a second flat tube 22. In this embodiment, the first flat tube 21 and the second flat tube 22 are symmetrically arranged and V-shaped. Specifically, one side of the first flat tube 21 and the second flat tube 22 is located above the smoke inlet 11, and the other side extends to the bottom surface of the partition 1 and has a gap between the bottom surface of the partition 1, so as to guide the high-temperature flue gas entering the partition 1 from the smoke inlet 11 to the bottom end of the secondary heat exchanger 2, so that it can fully exchange heat with the secondary heat exchanger 2.

[0034] The condensing heat exchanger structure with a flow guiding function provided by the embodiment of the utility model is a substantially closed area in the partition 1 where the secondary heat exchanger 2 is located, and is only provided with a smoke inlet 11 and a smoke outlet 131 for discharging smoke after heat exchange, which prolongs the contact and heat exchange time between the high-temperature smoke and the secondary heat exchanger 2 and improves the heat exchange efficiency. In addition, the first flat tube 21 and the second flat tube 22 of the secondary heat exchanger 2 can guide the high-temperature smoke entering from the smoke inlet 11 of the partition 1 to the bottom end of the secondary heat exchanger 2 (the direction of smoke flow is shown in FIG. 2 ). Figure 6 In the direction of the middle arrow), it fully exchanges heat with the secondary heat exchanger 2, further improving the heat exchange efficiency and reducing the user's cost of use. In addition, after the high-temperature flue gas flows into the partition 1, it will flow through the secondary heat exchanger 2 along the guide direction of the first flat tube 21 and the second flat tube 22, and its flow direction is consistent with the flow direction of the condensed water formed after the flue gas heat exchange, thereby achieving the effect of reducing the smoke exhaust resistance. The closed area formed by the partition 1 serves as a cavity for heat exchange between the high-temperature flue gas and the secondary heat exchanger 2. The front and rear sides are both provided with smoke inlets 11. After the high-temperature flue gas is heat exchanged in the primary heat exchanger below, it flows in from the smoke inlets 11 on the front and rear sides of the partition 1, thereby realizing the functional characteristics of the double flow channel, increasing the amount of smoke entering, and further improving the heat exchange efficiency.

[0035] In a preferred embodiment of the present invention, Figure 1 , Figure 4 As shown, a downward guide groove 132 is provided in the middle of the upper sealing plate 13. One end of the side wall of the guide groove 132 is located above the smoke inlet 11, and the other end extends to the bottom surface of the partition 1 and has a gap with the bottom surface of the partition 1. The side wall of the guide groove 132 forms a guide plate, which can guide the high-temperature smoke entering from the smoke inlet 11 of the partition 1 to the bottom end of the secondary heat exchanger 2 (the direction of smoke flow is shown in FIG. 2 ). Figure 6 The guide plate formed by the side wall of the guide groove 132 cooperates with the first flat tube 21 and the second flat tube 22 for efficient heat exchange to form an efficient heat exchange main body. The high-temperature flue gas flows from the left and right sides of the first flat tube 21 and the second flat tube 22 along the extension direction of the first flat tube 21 and the second flat tube 22, and exchanges heat with the water flowing inside the first flat tube 21 and the second flat tube 22, so that the latent heat of the flue gas is fully absorbed. Furthermore, the smoke exhaust port 131 is arranged at the bottom of the guide groove 132, so that the distance from the smoke inlet 11 is the largest, so as to prolong the flow time of the high temperature and the smoke in the partition 1, so that it can fully exchange heat with the secondary heat exchanger 2 and improve the heat exchange efficiency.

[0036] In one embodiment of the present invention, the partition plate 1 and the side sealing plate 12 are formed in one piece.

[0037] In order to further improve the heat exchange efficiency, the secondary heat exchanger 2 also includes heat exchange guide fins 23, such as Figure 1 , Figure 2 As shown, the heat exchange guide fin 23 includes a first sheet 231 and a second sheet 232, which are respectively sleeved on the outer periphery of the first flat tube 21 and the second flat tube 22, and correspond to the shapes of the first flat tube 21 and the second flat tube 22. The structural form is consistent with the flow guide direction of the first flat tube 21 and the second flat tube 22, which can further enhance the heat exchange and improve the heat exchange efficiency. At the same time, the heat exchange guide fins 23 are evenly distributed on the outer periphery of the first flat tube 21 and the second flat tube 22, so that the high-temperature flue gas can be evenly contacted with the first flat tube 21 and the second flat tube 22, so that the heat exchange is uniform. The first sheet 231 and the second sheet 232 are connected by a third sheet 233. Further, as Figure 2 As shown, the first sheet 231, the second sheet 232 and the third sheet 233 are provided with smoke dispersion holes 234, which facilitate the rapid diffusion of high-temperature smoke along the length direction of the first flat tube 21 and the second flat tube 22, thereby improving the heat exchange efficiency.

[0038] In one embodiment of the present invention, in order to realize the installation of the secondary heat exchanger 2, as shown in FIG. Figure 1As shown, the side sealing plate 12 is provided with a first long hole 121 and a second long hole 122 corresponding to the pipe openings of the first flat tube 21 and the second flat tube 22. The first long hole 121 and the second long hole 122 are arranged in a V shape, so that the pipe openings of the first flat tube 21 and the second flat tube 22 are inserted into the first long hole 121 and the second long hole 122 respectively. A connecting plate 14 is provided on the outer side of the side sealing plate 12, and the connecting plate 14 is provided with a third long hole 141 and a fourth long hole 142 corresponding to the pipe openings of the first flat tube 21 and the second flat tube 22. Correspondingly, the third long hole 141 and the fourth long hole 142 are arranged in a V shape, and the pipe openings of the first flat tube 21 and the second flat tube 22 are fixedly connected to the inner walls of the third long hole 141 and the fourth long hole 142 respectively. A sealing plate 15 corresponding to the shape of the connecting plate 14 is provided on the outer side of the connecting plate 14, and the sealing plate 15 is fixedly connected to the connecting plate 14. The outer side of the sealing plate 15 is provided with a first connecting cavity 151 and a second connecting cavity 152 corresponding to and communicating with the third long hole 141 and the fourth long hole 142 respectively. Correspondingly, the first connecting cavity 151 and the second connecting cavity 152 are arranged in a V shape. By connecting and communicating the first connecting cavity 151 with the first connecting cavity 151, the second connecting cavity 152 with the second connecting cavity 152, and the first connecting cavity 151 with the second connecting cavity 152, it is possible to realize the formation of a series of water flow channels between different flat tubes, thereby forming an S-shaped secondary heat exchange pipeline in the first flat tube 21 and the second flat tube 22. The first connecting cavity 151 is connected to the water inlet joint 3, and the second connecting cavity 152 is connected to the water outlet joint 4, so as to introduce cold water into the secondary heat exchange pipeline, and the cold water in the pipeline is heat exchanged and then flows from the water outlet joint 4 to the primary heat exchanger below. In this embodiment, the number of the first flat tube 21 and the second flat tube 22 is two. On one of the sealing plates 15, the first connecting cavity 151 at the bottom is connected to the water inlet joint 3, the second connecting cavity 152 at the bottom is connected to the water outlet joint 4, and the first connecting cavity 151 at the top is connected and communicated with the second connecting cavity 152; on another sealing plate 15, the two first connecting cavities 151 are connected and communicated, and the two second connecting cavities 152 are connected and communicated. In this embodiment, the water inlet joint 3 and the water outlet joint 4 are located on the same side, which is convenient for saving space and connecting with the inlet and outlet water pipes.

[0039] After the secondary heat exchanger 2 exchanges heat with the high-temperature flue gas, the water vapor in the high-temperature flue gas condenses to form condensed water, which falls into the cavity formed between the partition plate 1 and the side sealing plate 12. Figure 1As shown, in one embodiment of the utility model, a condensate interface 5 is provided at the bottom of the side sealing plate 12, and the condensate interface 5 is connected to a condensate collection device 7 through a condensate discharge pipe 6. The condensate formed in the secondary heat exchange process of converting high-temperature flue gas into low-temperature flue gas is uniformly collected by the partition 1, and finally flows out from the condensate discharge pipe 6, and the condensate is introduced into the condensate collection device 7 to prevent the condensate from affecting the heat exchange of the secondary heat exchanger in the partition 1.

[0040] Specifically, if Figure 5 As shown, the condensate collecting device 7 comprises a tank body, and a first baffle 71 required for condensate liquid sealing is provided inside the tank body, the first baffle 71 extends upward from the bottom of the tank body, and there is a gap between the free end of the first baffle 71 and the top of the tank body, and the first baffle 71 divides the inside of the tank body into a first area 711 and a second area 712 connected at the top, the top of the first area 711 is provided with a condensate inlet 72, and the bottom of the second area 712 is provided with a condensate outlet 73. A second baffle 74 extending toward the bottom of the first area 711 is provided on the top of the tank body, and there is a gap between the free end of the second baffle 74 and the bottom of the tank body, and the second baffle 74 is spaced apart from the first baffle 71. An S-shaped flow channel is formed between the second baffle 74 and the first baffle 71, which can prevent floating objects from entering the second area 712 and blocking the condensate outlet 73. In order to give an alarm when the condensate outlet 73 is blocked, a water level detection device 75 is provided at the top of the first zone 711. When the condensate outlet 73 is blocked, the water level in the tank body continues to rise. When it rises to a predetermined height, the water level detection device 75 gives an alarm. The water level detection device 75 can be a water level sensor or a detection electrode. When the condensate cannot be discharged, the condensate level in the tank body gradually rises. When it reaches the water level point of the detection electrode detection position, the detection electrode is turned on to realize the function of blockage alarm. Furthermore, a sewage outlet 76 is provided at the bottom of the first zone 711 to discharge sludge and other debris.

[0041] In one embodiment of the present invention, Figure 6-Figure 7As shown, the above-mentioned condensing heat exchanger structure with a flow-guiding function also includes a cylinder 8 formed by connecting a plurality of side plates 81. In this embodiment, the number of the side plates 81 is 4. A top plate 82 is provided on the top of the cylinder 8 to form a cylinder with an opening at the bottom. A corresponding first mounting notch 811 is provided on the top of a group of side plates 81 opposite to the cylinder 8, and a second mounting notch 821 corresponding to the first mounting notch 811 is provided on the top of the top plate 82. The partition 1 can be installed from the second mounting notch 821 to between the two first mounting notches 811 to separate the cylinder 8 into an upper area 83 and a lower area 84. A primary heat exchanger 9 is provided in the lower area 84 for heat exchange with the flame generated by the burner below; the secondary heat exchanger 2 is provided in the upper area 83 for heat exchange with the high-temperature flue gas generated by the burner flame. The condensing heat exchanger structure with a flow diversion function provided in this embodiment has a primary heat exchanger 9 and a secondary heat exchanger 2 integrated in a cylinder 8 formed by connecting four side panels 81. The side panels 81 can be connected to external devices, and a first mounting slot 811 and a second mounting slot 821 for mounting the secondary heat exchanger 2 are designed on the top, which can meet the combined integrated connection of the primary heat exchanger 9 and the secondary heat exchanger 2 to form an integrated condensing heat exchanger, making the condenser structure compact and simple, and reducing the manufacturing and assembly costs.

[0042] In one embodiment of the present invention, Figure 8 As shown, the water connection between the primary heat exchanger 9 and the secondary heat exchanger 2 is conducted through the connecting pipe 24. The tap water flows into the secondary heat exchanger 2 from the water inlet pipe 25 and then flows into the primary heat exchanger 9 through the connecting pipe 24, and then flows out from the water outlet pipe 91 of the primary heat exchanger 9.

[0043] Specifically, if Figure 6 As shown, the first-stage heat exchanger 9 includes a plurality of first heat exchange tubes 92 and heat exchange fins 93. The cold water in the first heat exchange tubes 92 absorbs the heat transferred by the flame generated by the burner below through the tube wall and the heat exchange fins 93, thereby increasing the temperature for use by customers. Preferably, the heat exchange fins 93 are in an inverted U shape, and the first heat exchange tubes 92 are passed through the heat exchange fins 93. In this embodiment, a heat exchange fin imitating the shape of a flame is adopted, which imitates the shape of a flame combustion process with a high middle and low sides, thereby achieving uniform heat exchange between the entire combustion flame and the heat exchange fins 93, and ensuring high energy efficiency output of the heat exchange process of the first-stage heat exchanger 9.

[0044] In order to air-cool the shell (i.e., the cylinder 8) of the condensing heat exchanger, Figure 6 , Fig. 9As shown, the side plates 81 of the cylinder 8 each include a cover plate 812 and an inner plate 813, between which an air cooling channel 814 is formed, and the air cooling channel 814 is connected to an air supply system (not shown in the figure). Cold air flows in from one end of the air cooling channel 814, exchanges heat with the inner wall of the channel to reduce the surface temperature of the side plate 81, and then flows out from the other end of the air cooling channel 814.

[0045] The utility model also provides a gas water heater, comprising the above-mentioned condensing heat exchanger structure with flow guiding function.

[0046] The condensing heat exchanger structure with a flow guiding function provided by the utility model can achieve a structural output of efficient heat exchange by ensuring the flow direction of high-temperature flue gas, meet the first-level energy efficiency of the product, and enable it to be effectively and reliably used in gas water heaters.

[0047] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A condensing heat exchanger structure with a flow guiding function, characterized in that: The invention comprises a partition (1) with a U-shaped cross section, wherein a secondary heat exchanger (2) is arranged inside the partition (1); smoke inlets (11) are arranged on both sides of the partition (1); side sealing plates (12) are arranged at both ends of the partition (1), and an upper sealing plate (13) is arranged on the top of the partition (1) to cover the secondary heat exchanger (2); the upper sealing plate (13) is provided with a smoke exhaust port (131); the secondary heat exchanger (2) comprises a first flat tube (21) and a second flat tube (22); one side of the first flat tube (21) and the second flat tube (22) is located above the smoke inlet (11), and the other side extends to the bottom surface of the partition (1) and has a gap with the bottom surface of the partition (1).

2. The condensing heat exchanger structure with flow guiding function according to claim 1 is characterized in that: A downward guiding groove (132) is provided in the middle of the upper sealing plate (13); one end of the side wall of the guiding groove (132) is located above the smoke inlet (11), and the other end extends toward the bottom surface of the partition (1) and has a gap with the bottom surface of the partition (1).

3. The condensing heat exchanger structure with flow guiding function according to claim 2 is characterized in that: The smoke exhaust port (131) is arranged at the bottom of the guide groove (132).

4. The condensing heat exchanger structure with flow guiding function according to claim 1, characterized in that: The first flat tube (21) and the second flat tube (22) are symmetrically arranged; the secondary heat exchanger (2) further comprises a heat exchange guide fin (23), the heat exchange guide fin (23) comprising a first plate (231) and a second plate (232), which are respectively sleeved on the outer periphery of the first flat tube (21) and the second flat tube (22), and correspond to the shapes of the first flat tube (21) and the second flat tube (22); the first plate (231) and the second plate (232) are connected via a third plate (233).

5. The condensing heat exchanger structure with flow guiding function according to claim 1, characterized in that: The side sealing plate (12) is provided with a first long hole (121) and a second long hole (122) corresponding to the pipe openings of the first flat tube (21) and the second flat tube (22); the pipe openings of the first flat tube (21) and the second flat tube (22) are respectively inserted into the first long hole (121) and the second long hole (122); a connecting plate (14) is provided on the outer side of the side sealing plate (12); the connecting plate (14) is provided with a third long hole (141) and a fourth long hole (142) corresponding to the pipe openings of the first flat tube (21) and the second flat tube (22); the first flat tube (21) ) and the pipe openings of the second flat tube (22) are respectively fixedly connected to the inner walls of the third long hole (141) and the fourth long hole (142); a sealing plate (15) corresponding to the shape of the connecting plate (14) is provided on the outer side of the connecting plate (14); a first connecting cavity (151) and a second connecting cavity (152) corresponding to the third long hole (141) and the fourth long hole (142) are respectively provided on the outer side of the sealing plate (15); on one of the sealing plates (15), the first connecting cavity (151) is connected to the water inlet joint (3), and the second connecting cavity (152) is connected to the water outlet joint (4).

6. The condensing heat exchanger structure with flow guiding function according to claim 1, characterized in that: A condensate water interface (5) is provided at the bottom end of the side sealing plate (12), and the condensate water interface (5) is connected to a condensate water collecting device (7) via a condensate water discharge pipe (6).

7. The condensing heat exchanger structure with flow guiding function according to claim 6, characterized in that: The condensate collecting device (7) comprises a tank body, wherein a first baffle (71) is arranged inside the tank body, the first baffle (71) extends upward from the bottom of the tank body and there is a gap between the free end of the first baffle (71) and the top of the tank body, the first baffle (71) divides the inside of the tank body into a first zone (711) and a second zone (712) which are connected at the top, the top of the first zone (711) is provided with a condensate inlet (72), and the bottom of the second zone (712) is provided with a condensate outlet (73); a second baffle (74) is arranged on the top of the tank body and extends toward the bottom of the first zone (711), there is a gap between the free end of the second baffle (74) and the bottom of the tank body, and the second baffle (74) and the first baffle (71) are arranged at intervals; a water level detection device (75) is arranged on the top of the first zone (711).

8. The condensing heat exchanger structure with flow guiding function according to any one of claims 1 to 7, characterized in that: The heat exchanger (8) further comprises a cylinder (8) formed by connecting a plurality of side plates (81), wherein a top plate (82) is provided on the top of the cylinder (8); a corresponding first mounting notch (811) is provided on the top of a group of side plates (81) opposite to the cylinder (8), and a second mounting notch (821) corresponding to the first mounting notch (811) is provided on the top of the top plate (82); the partition (1) is provided between two of the first mounting notches (811) to separate the cylinder (8) into an upper area (83) and a lower area (84); a primary heat exchanger (9) is provided in the lower area (84), and a secondary heat exchanger (2) is provided in the upper area (83); the primary heat exchanger (9) comprises a plurality of first heat exchange tubes (92) and heat exchange fins (93); the heat exchange fins (93) are in an inverted U shape, and the first heat exchange tubes (92) are passed through the heat exchange fins (93).

9. The condensing heat exchanger structure with flow guiding function according to claim 8, characterized in that: The side plate (81) comprises a cover plate (812) and an inner plate (813), an air cooling channel (814) is formed between the cover plate and the inner plate, and the air cooling channel (814) is connected to an air supply system.

10. A gas water heater, characterized in that: The invention comprises a condensing heat exchanger structure with a flow guiding function according to any one of claims 1 to 9.

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