Condensing heat exchanger and water heater

Abstract

The utility model belongs to the technical field of heat supply, and particularly discloses a condensing heat exchanger and a water heater. The condensation heat exchanger comprises a condensation box and a heat exchange pipe assembly. A heat exchange cavity is formed in the condensation box, a smoke inlet and a smoke outlet which are communicated with the heat exchange cavity are formed in the condensation box, a rotation limiting boss is arranged on the inner wall of the condensation box, and a rotation limiting surface is arranged on the rotation limiting boss; the heat exchange pipe assembly comprises a heat exchange pipe, the water inlet end and the water outlet end of the heat exchange pipe are each provided with a water inlet and outlet connector, each water inlet and outlet connector is provided with a rotation limiting plane, and the rotation limiting plane of each water inlet and outlet connector can abut against one rotation limiting face. When the connecting flange is fixed on the condensation box through the bolt and nut assembly, a fixing piece for limiting rotation of the two water inlet and outlet connectors does not need to be welded on the heat exchange tube assembly, and heat exchange tubes are prevented from being welded through during welding.

Description

Technical Field

[0001] The utility model relates to the technical field of heating, in particular to a condensing heat exchanger and a water heater. Background Art

[0002] Condensing gas water heaters are favored by users for their energy-saving and environmentally friendly advantages. Compared with ordinary gas water heaters, condensing gas water heaters have an additional condensing heat exchanger, which can absorb the heat of the high-temperature flue gas generated by gas combustion and preheat the cold water, thereby improving the heat conversion efficiency.

[0003] Condensing heat exchangers are generally equipped with heat exchange coil assemblies. External cold water flows into the heat exchange coil assembly, and high-temperature flue gas exchanges heat with the heat exchange coil assembly to preheat the cold water. The water inlet end of the heat exchange coil assembly is provided with a water inlet joint, and the water outlet end is provided with a water outlet joint.

[0004] See also Figure 1 In order to prevent the water inlet joint 1' and the water outlet joint 2' from rotating and causing the heat exchange coil to twist when the locking nuts are locked and the external water inlet and outlet pipes are connected, a fixing part 3' is generally welded between the water inlet joint 1' and the water outlet joint 2', and the fixing part 3' is also welded to the water inlet end and the water outlet end of the heat coil assembly to limit the rotation of the water inlet joint 1' and the water outlet joint 2'. However, when the fixing part 3' is welded, the heat exchange coil of the heat exchange coil assembly is easily welded through, resulting in water leakage of the heat exchange coil. Utility Model Content

[0005] One of the technical problems solved by the utility model is to provide a condensing heat exchanger, which can effectively solve the technical problem in the prior art that when a fixing piece needs to be welded on the heat exchange coil assembly of the condensing heat exchanger, the heat exchange coil is easily welded and leaked.

[0006] The second technical problem solved by the present invention is to provide a water heater, which can effectively solve the technical problem in the prior art that when a fixing piece needs to be welded on the heat exchange coil assembly of the condensing heat exchanger, the heat exchange coil is easily welded and leaks.

[0007] The first technical problem mentioned above is solved by the following technical solution:

[0008] Condensing heat exchanger, including:

[0009] A condensation box, wherein a heat exchange cavity is arranged in the condensation box, a smoke inlet and a smoke exhaust port connected to the heat exchange cavity are arranged on the condensation box, a rotation limiting boss is arranged on the inner wall of the condensation box, and a rotation limiting surface is arranged on the rotation limiting boss;

[0010] The heat exchange tube assembly comprises a heat exchange tube, wherein the water inlet and outlet ends of the heat exchange tube are both provided with water inlet and outlet joints, and the water inlet and outlet joints are provided with rotation limiting planes, and the rotation limiting plane of each of the water inlet and outlet joints can abut against one of the rotation limiting surfaces.

[0011] Compared with the background technology, the condensing heat exchanger described in the utility model has the following beneficial effects:

[0012] When the heat exchange tube assembly of the condensing heat exchanger is installed in the condensing box, the rotation limiting plane of the inlet and outlet water joints at the water inlet end of the heat exchange tube is abutted against the corresponding rotation limiting surface, and the rotation limiting surface can limit the rotation of the inlet and outlet water joints at the water inlet end; the rotation limiting plane of the inlet and outlet water joints at the water outlet end of the heat exchange tube is abutted against the corresponding rotation limiting surface, and the rotation limiting surface can limit the rotation of the inlet and outlet water joints at the water outlet end.

[0013] With such an arrangement, when the fastening nut is locked and the external inlet and outlet water pipes are connected, the inlet and outlet water joints will not rotate, so there is no need to weld fixings on the heat exchange tube assembly to limit the rotation of the two inlet and outlet water joints, thereby avoiding welding through the heat exchange tube during welding and improving product reliability.

[0014] In one of the embodiments, the inner wall of the condensation box is provided with two rotation limiting bosses, and the two rotation limiting bosses are provided one-to-one with the two water inlet and outlet joints, and the rotation limiting plane of each water inlet and outlet joint can abut against the rotation limiting surface of the corresponding rotation limiting boss; or

[0015] The inner wall of the condensation box is provided with a rotation limiting boss, and the opposite sides of the rotation limiting boss are respectively provided with a rotation limiting surface, and the two rotation limiting surfaces are arranged in a one-to-one correspondence with the two inlet and outlet water joints, and the rotation limiting plane of each inlet and outlet water joint can abut against the corresponding rotation limiting surface.

[0016] In one embodiment, a first smoke baffle is provided in the heat exchange cavity, and the first smoke baffle divides the heat exchange cavity into a smoke inlet channel and a heat exchange tube assembly installation cavity connected at the top, and the heat exchange tube assembly is installed in the heat exchange tube assembly installation cavity;

[0017] Along the flow direction of the smoke, the flow area of ​​the smoke inlet channel gradually decreases, the smoke inlet is communicated with the entrance of the smoke inlet channel, and the outlet of the heat exchange tube assembly installation cavity is communicated with the smoke exhaust port.

[0018] In one of the embodiments, a heat insulation cover with openings at both ends is provided at the entrance of the smoke inlet channel, and a gap exists between the outer side surface of the heat insulation cover and the inner side surface of the smoke inlet channel.

[0019] In one of the embodiments, one of the heat insulation cover and the condensation box is provided with a buckle, and the other is provided with a snap-fitting hole for snapping with the buckle.

[0020] In one of the embodiments, a second smoke baffle is further provided in the installation cavity of the heat exchange tube assembly, and the second smoke baffle divides the installation cavity of the heat exchange tube assembly into a first space and a second space. A part of the heat exchange tubes of the heat exchange tube assembly are located in the first space, and the rest of the heat exchange tubes are located in the second space. The outlet of the smoke inlet channel is connected to the upper part of the first space, the lower part of the first space is connected to the lower part of the second space, and the upper part of the second space is connected to the smoke exhaust port.

[0021] In one embodiment, the inlet end of the heat exchange tube is located in the second space, and the outlet end of the heat exchange tube is located in the first space.

[0022] In one of the embodiments, a plug-in groove for plugging and cooperating with the second smoke baffle is provided in the installation cavity of the heat exchange tube assembly.

[0023] In one of the embodiments, the ratio of the minimum flow area of ​​the smoke inlet channel to the flow area of ​​the smoke exhaust port is 1-1.2.

[0024] The above second technical problem is solved by the following technical solution:

[0025] A water heater comprises the above-mentioned condensing heat exchanger.

[0026] Compared with the background technology, the water heater of the utility model has the following beneficial effects:

[0027] When assembling the condensing heat exchanger of the heat exchanger, the heat exchange tube assembly is installed in the condensation box, and the rotation limiting plane of the inlet and outlet water joints at the water inlet end of the heat exchange tube is abutted against the corresponding rotation limiting surface, and the rotation limiting surface can limit the rotation of the inlet and outlet water joints at the water inlet end; the rotation limiting plane of the inlet and outlet water joints at the water outlet end of the heat exchange tube is abutted against the corresponding rotation limiting surface, and the rotation limiting surface can limit the rotation of the inlet and outlet water joints at the water outlet end.

[0028] With such an arrangement, when the fastening nut is locked and the external inlet and outlet water pipes are connected, the inlet and outlet water joints will not rotate, so there is no need to weld fixings on the heat exchange tube assembly to limit the rotation of the two inlet and outlet water joints, thereby avoiding welding through the heat exchange tube during welding and improving product reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of welding a fixing part on a heat exchange coil assembly in the prior art;

[0030] Figure 2A schematic diagram of the structure of a condensing heat exchanger provided in Embodiment 1 of the present utility model;

[0031] Figure 3 A schematic cross-sectional structure diagram of a condensing heat exchanger provided in Embodiment 1 of the present utility model;

[0032] Figure 4 A schematic diagram of the structure of a heat exchange tube assembly provided in Embodiment 1 of the present utility model;

[0033] Figure 5 A schematic diagram of the structure of the water inlet and outlet joints provided in the first embodiment of the utility model;

[0034] Figure 6 A front view of the water inlet and outlet joint provided in the first embodiment of the utility model;

[0035] Figure 7 This is a schematic diagram of the installation of the water inlet and outlet joints and the rotation limiting boss provided in the first embodiment of the utility model;

[0036] Figure 8 This is a schematic diagram of the body and the heat insulation cover of the condensation box provided in the first embodiment of the utility model when they are not installed in place;

[0037] Fig. 9 for Figure 8 The enlarged view of point A in the middle;

[0038] Fig.10 A schematic structural diagram of a cover body of a condensation box provided in Embodiment 1 of the present utility model;

[0039] Fig.11 This is a schematic diagram of the flow direction of flue gas when the condensing heat exchanger provided in Example 1 of the utility model is working.

[0040] Description of labels:

[0041] Figure 1 middle:

[0042] 1', water inlet joint; 2', water outlet joint; 3', fixing piece;

[0043] Figure 2-Figure 11 middle:

[0044] 1. Condensation box; 11. Heat exchange chamber; 111. First smoke baffle; 112. Smoke inlet channel; 113. Heat exchange tube assembly installation chamber; 1131. First space; 1132. Second space; 1133. Plug-in slot; 114. Second smoke baffle; 1141. First plate; 1142. Second plate;

[0045] 12. Smoke inlet; 13. Smoke outlet; 14. Rotation limiting boss; 141. Rotation limiting surface; 15. Condensation box body; 151. Clamping hole; 16. Cover plate; 161. Fixed bracket;

[0046] 2. heat exchange tube assembly; 21. heat exchange tube; 22. water inlet and outlet joints; 221. connecting flange; 2211. rotation limit plane;

[0047] 3. heat shield; 31. buckle; 311. buckle body; 312. elastic clamp arm;

[0048] 4. Exhaust pipe;

[0049] 5. Drain pipe. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0051] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0052] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0053] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0054] Embodiment 1

[0055] See also Figure 2-Figure 7 This embodiment provides a condensing heat exchanger, which is used to be installed on a water heater. Furthermore, the condensing heat exchanger is used to be installed on a condensing gas water heater.

[0056] Specifically, in this embodiment, the condensing heat exchanger includes a condensing box 1 and a heat exchange tube assembly 2 .

[0057] A heat exchange chamber 11 is provided in the condensation box 1 , a smoke inlet 12 and a smoke exhaust port 13 communicating with the heat exchange chamber 11 are provided on the condensation box 1 , a rotation limiting boss 14 is provided on the inner wall of the condensation box 1 , and a rotation limiting surface 141 is provided on the rotation limiting boss 14 .

[0058] The heat exchange tube assembly 2 includes a heat exchange tube 21, and an inlet and outlet joint 22 is provided at the water inlet and outlet ends of the heat exchange tube 21. A rotation limiting plane 2211 is provided on the inlet and outlet joint 22, and the rotation limiting plane 2211 of each inlet and outlet joint 22 can abut against a rotation limiting surface 141.

[0059] Furthermore, the water inlet and outlet joint 22 includes a connecting flange 221 , and a rotation limiting plane 2211 is provided on the connecting flange 221 .

[0060] Optionally, in this embodiment, the heat exchange tube 21 is a stainless steel corrugated tube; the heat exchange tube 21 is formed by bending and coiling a whole corrugated tube. Adjacent tubes of the heat exchange tube 21 are positioned by clamps.

[0061] Optionally, a water inlet and outlet joint 22 is welded to the water inlet and outlet ends of the heat exchange tube 21. When the water inlet and outlet joints 22 are welded in place, the extension direction of the rotation limiting plane 2211 of the water inlet and outlet joints 22 is controlled to be consistent with the extension direction of the rotation limiting surface 141, so that when the water inlet and outlet joints 22 are installed on the condensation box 1, the rotation limiting plane 2211 can abut against the corresponding rotation limiting surface 141.

[0062] Specifically, in this embodiment, the extension direction of the rotation limiting surface 141 is the vertical direction; when the inlet and outlet water joints 22 are welded in place, the extension direction of the rotation limiting plane 2211 of the inlet and outlet water joints 22 is controlled to be the vertical direction.

[0063] In the condensing heat exchanger provided in this embodiment, when the heat exchange tube assembly 2 is installed in the condensing box 1, the connecting flange 221 is located in the heat exchange cavity 11. The rotation limiting plane 2211 of the water inlet and outlet joints 22 at the water inlet end of the heat exchange tube 21 is abutted against the corresponding rotation limiting surface 141, and the rotation limiting surface 141 can limit the rotation of the water inlet and outlet joints 22 at the water inlet end; the rotation limiting plane 2211 of the water inlet and outlet joints 22 at the water outlet end of the heat exchange tube 21 is abutted against the corresponding rotation limiting surface 141, and the rotation limiting surface 141 can limit the rotation of the water inlet and outlet joints 22 at the water outlet end.

[0064] With such an arrangement, when the fastening nut is locked and the external inlet and outlet water pipes are connected, the inlet and outlet water joints 22 will not rotate, so there is no need to weld fixings on the heat exchange tube assembly 2 to limit the rotation of the two inlet and outlet water joints 22, thereby avoiding welding through the heat exchange tube during welding and improving product reliability.

[0065] When the condensing heat exchanger is working, high-temperature flue gas enters the heat exchange chamber 11 from the smoke inlet 12 and exchanges heat with the heat exchange tube 21, thereby preheating the water in the heat exchange tube 21; the flue gas that has completed the heat exchange is discharged from the smoke exhaust port 13.

[0066] Optionally, in this embodiment, the smoke exhaust port 13 is arranged upward. Of course, in other embodiments, the smoke exhaust port 13 can also be arranged sideways.

[0067] In one embodiment, two rotation limiting bosses 14 are provided on the inner wall of the condensation box 1 .

[0068] Specifically, the two rotation limiting bosses 14 are arranged relatively spaced apart.

[0069] The two rotation limiting bosses 14 are arranged in one-to-one correspondence with the two water inlet and outlet joints 22, and the rotation limiting plane 2211 of each water inlet and outlet joint 22 can abut against the rotation limiting surface 141 of its corresponding rotation limiting boss 14; or

[0070] The inner wall of the condensation box 1 is provided with a rotation limiting boss 14, and the opposite sides of the rotation limiting boss 14 are respectively provided with a rotation limiting surface 141, and the two rotation limiting surfaces 141 are arranged one by one with the two inlet and outlet water joints 22, and the rotation limiting plane 2211 of each inlet and outlet water joint 22 can abut against its corresponding rotation limiting surface 141.

[0071] Optionally, in other embodiments, a rotation limiting boss 14 is provided on the inner wall of the condensation box 1, and a rotation limiting surface 141 is provided on the opposite sides of the rotation limiting boss 14 respectively. The two rotation limiting surfaces 141 are arranged one-to-one with the two inlet and outlet water joints 22, and the rotation limiting plane 2211 of each inlet and outlet water joint 22 can abut against its corresponding rotation limiting surface 141. In this way, the two inlet and outlet water joints 22 can share one rotation limiting boss 14.

[0072] Specifically, see Figure 5-Figure 7 In this embodiment, two rotation limiting bosses 14 are provided on the inner wall of the condensation box 1. The two rotation limiting bosses 14 are arranged relatively spaced apart, and the two rotation limiting bosses 14 are arranged one-to-one with the two inlet and outlet water joints 22. The rotation limiting plane 2211 of each inlet and outlet water joint 22 can abut against the rotation limiting surface 141 of its corresponding rotation limiting boss 14.

[0073] More specifically, two rotation limiting planes 2211 are provided on the connection flange 221 of the water inlet and outlet joint 22, so that the installer can select one of the rotation limiting planes 2211 to abut against the corresponding rotation limiting surface 141. Of course, in other embodiments, the number of the rotation limiting planes 2211 on the connection flange 221 can also be set as needed.

[0074] Specifically, in this embodiment, two rotation limiting planes 2211 can be formed by cutting away part of the material on both sides of the circular connecting flange 221 .

[0075] Preferably, the rotation limiting boss 14 is integrally formed on the inner wall of the condensation box 1 .

[0076] In one of the embodiments, in order to improve the heat exchange efficiency of the condensing heat exchanger, a first smoke baffle 111 is provided in the heat exchange chamber 11, and the first smoke baffle 111 divides the heat exchange chamber 11 into a smoke inlet channel 112 and a heat exchange tube assembly installation chamber 113 connected at the top, and the heat exchange tube assembly 2 is installed in the heat exchange tube assembly installation chamber 113.

[0077] Along the flow direction of the smoke, the flow area of ​​the smoke inlet channel 112 gradually decreases, and the smoke inlet port 12 is connected to the entrance of the smoke inlet channel 112. The exit of the smoke inlet channel 112 is connected to the entrance of the heat exchange tube assembly installation cavity 113. The exit of the heat exchange tube assembly installation cavity 113 is connected to the smoke exhaust port 13.

[0078] The smoke inlet channel 112 is offset relative to the smoke exhaust port 13 .

[0079] By setting the first smoke baffle 111, a smoke inlet channel 112 is formed; in the smoke inlet channel 112, along the flow direction of the smoke, the flow area of ​​the smoke inlet channel 112 gradually decreases. When the smoke enters the smoke inlet channel 112 from the smoke inlet port 12, the flow speed of the smoke will gradually increase due to the structure of the smoke inlet channel 112 with a gradually decreasing flow cross-sectional area, so that more smoke can flow through the heat exchange tube assembly installation cavity 113 per unit time and exchange heat with the heat exchange tube 21 in the heat exchange tube assembly installation cavity 113, thereby improving the heat exchange efficiency.

[0080] Furthermore, the condensing heat exchanger further comprises a drain pipe 5, which is located outside the condensing box 1. A drain port communicating with the drain pipe 5 is provided at the lowest point of the heat exchange tube assembly installation cavity 113.

[0081] Preferably, in this embodiment, the first smoke baffle 111 is a curved surface, and the condensed water condensed on the heat exchange tube 21 drops onto the first smoke baffle 111 and flows along the first smoke baffle 111 to the lowest point of the heat exchange tube assembly installation cavity 113.

[0082] In one embodiment, the ratio of the minimum flow area of ​​the smoke inlet channel 112 to the flow area of ​​the smoke exhaust port 13 is 1-1.2. This arrangement can reduce the smoke exhaust resistance and ensure that after the condensing heat exchanger is installed on the gas water heater, the smoke exhaust resistance of the high-temperature smoke of the main heat exchanger of the gas water heater is constant and appropriate.

[0083] In one embodiment, see Figure 7 and Figure 8 A heat shield 3 with openings at both ends is provided at the entrance of the smoke inlet channel 112, and there is a gap between the outer side of the heat shield 3 and the inner side of the smoke inlet channel 112. The smoke at the smoke inlet port 12 flows into the smoke inlet channel 112 through the heat shield 3. The provision of the heat shield 3 can prevent the smoke with too high temperature from directly contacting the condensation box 1 and damaging the condensation box 1.

[0084] Optionally, the heat insulation cover 3 is snap-connected with the condensation box 1 .

[0085] Optionally, the size of the gap is 2mm-3mm; illustratively, the size of the gap can be 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm or 3mm. Of course, in other embodiments, the size of the gap can be set as needed, and no excessive restrictions are made here.

[0086] Furthermore, the outlet flow area of ​​the heat insulation cover 3 is smaller than the inlet flow area of ​​the heat insulation cover 3; such an arrangement enables the heat insulation cover 3 to pre-accelerate the flow velocity of the flue gas.

[0087] At the same time, the outlet flow area of ​​the heat insulation cover 3 is smaller than the inlet flow area of ​​the heat insulation cover 3 , which requires a baffle to be provided at the outlet of the heat insulation cover 3 , and the baffle can also play a heat insulation role.

[0088] The outlet of the heat shield 3 is offset relative to the smoke exhaust port 13 .

[0089] Specifically, the condensation box 1 is an injection molded part, and its material can be selected as PPS+30% GF (that is, 30% glass fiber reinforced PPS). The condensation box 1 can withstand high-temperature flue gas at a temperature of 180°C-200°C. The heat insulation cover 3 is made of aluminum-plated plate. The setting of the heat insulation cover 3 can prevent the condensation box 1 from being melted by flue gas exceeding the temperature resistance range of the condensation box 1, thereby preventing the temperature control detection device on the surface of the condensation box 1 from being misaligned due to the distortion of the condensation box 1, and failing to identify the poor heat exchange of the whole machine, thereby causing other technical problems of potential safety hazards.

[0090] See also Figure 8 and Fig. 9 In one of the embodiments, one of the heat insulation cover 3 and the condensation box 1 is provided with a buckle 31, and the other is provided with a snap-fitting hole 151 snap-fitted with the buckle 31.

[0091] Specifically, in this embodiment, the condensation box includes a condensation box body 15 and a cover plate 16. The heat exchange chamber 11 is arranged in the condensation box body 15. The cover plate 16 covers the upper opening of the heat exchange chamber 11, and the smoke exhaust port 13 is arranged on the cover plate 16. The cover plate 16 is provided with a smoke exhaust pipe 4 connected to the smoke exhaust port 13.

[0092] Furthermore, a fixing bracket 161 is also provided on the cover plate 16 , and the fixing bracket 161 is used to be installed and fixed with the bottom shell of the gas water heater, so as to realize the installation of the condensing heat exchanger on the bottom shell of the gas water heater.

[0093] The lower opening of the condensation box body 15 is the smoke inlet 12, and a lower flange is arranged around the lower opening, and a snap-on hole 151 is arranged on the lower flange; a heat insulation cover flange is arranged at the lower opening of the heat insulation cover 3, and a snap 31 is arranged on the heat insulation cover flange.

[0094] When assembling the condensation box body 15 and the heat insulation cover 3 of the condensation box 1, the heat insulation cover 3 is installed into the smoke inlet channel 112 from the lower end opening of the condensation box body 15. As the heat insulation cover 3 is installed, the buckle 31 passes through the snap-fit ​​hole 151 and is finally snap-fitted with the snap-fit ​​hole 151.

[0095] An upper flange is arranged around the upper opening of the condensation box body 15 , and a cover plate connecting flange is arranged around the cover plate 16 . The upper flange and the cover plate connecting flange are fixedly connected.

[0096] Specifically, see Figure 8 and Fig. 9In this embodiment, the buckle 31 includes a buckle body 311 and an elastic clamp arm 312. The elastic clamp arm 312 is formed by cutting material on the buckle body 311. When the buckle 31 passes through the clamping hole 151, the elastic clamp arm 312 is restricted to be coplanar with the buckle body 311; when the heat shield 3 is installed in place, the elastic clamp arm 312 is reset and the lower end abuts against the upper surface of the lower flange.

[0097] In one embodiment, see Figure 3 A second smoke baffle 114 is also provided in the heat exchange tube assembly installation cavity 113, and the second smoke baffle 114 divides the heat exchange tube assembly installation cavity 113 into a first space 1131 and a second space 1132. A part of the heat exchange tubes 21 of the heat exchange tube assembly 2 are located in the first space 1131, and the remaining heat exchange tubes 21 are located in the second space 1132. The outlet of the smoke inlet channel 112 is connected to the entrance of the first space 1131, the outlet of the first space 1131 is connected to the entrance of the second space 1132, and the outlet of the second space 1132 is connected to the smoke exhaust port 13.

[0098] Specifically, the outlet of the smoke inlet channel 112 is communicated with the upper portion of the first space 1131 , the lower portion of the first space 1131 is communicated with the lower portion of the second space 1132 , and the upper portion of the second space 1132 is communicated with the smoke exhaust port 13 .

[0099] Such an arrangement can extend the flow path of the flue gas in the heat exchange tube assembly installation cavity 113, thereby improving the utilization rate of the flue gas preheating.

[0100] Preferably, the lowest point of the second flue gas baffle 114 is lower than the axial height of the lowest heat exchange tube 21, so that the flue gas can flow to the bottom heat exchange tube 21, ensuring that the heat exchange tubes 21 in the first space 1131 and the second space 1132 can exchange heat with the flue gas.

[0101] Preferably, in this embodiment, the heat exchange tubes 21 on both sides of the second flue gas baffle 114 are symmetrically distributed.

[0102] In order to further improve the utilization rate of flue gas preheating and avoid energy waste, in one embodiment, the inlet end of the heat exchange tube 21 is located in the second space 1132, and the outlet end of the heat exchange tube 21 is located in the first space 1131. This arrangement allows a large temperature difference between the water and the flue gas in the heat exchange tube 21 in both the first space 1131 and the second space 1132, so as to strengthen the whole heat exchange process of the heat exchange tube 21.

[0103] In one embodiment, the heat exchange tube assembly installation cavity 113 is provided with a plug-in groove 1133 for plugging with the second smoke baffle 114. Such a configuration can ensure the stability of the position of the second smoke baffle 114 and prevent the second smoke baffle 114 from being displaced or deformed by the impact of fast-flowing smoke.

[0104] Specifically, see Figure 3 and Fig.10 The second smoke baffle 114 includes a first plate 1141 and a second plate 1142 which are arranged at an angle. The first plate 1141 is inclined relative to the horizontal plane and is connected to the lower surface of the cover plate 16. The second plate 1142 is arranged approximately along the vertical direction.

[0105] Preferably, in this embodiment, the first smoke baffle 111 and the second smoke baffle 114 are made of stainless steel, preferably 201 stainless steel. The surfaces of the first smoke baffle 111 and the second smoke baffle 114 need to be mirror-finished to reflect the heat radiated by the smoke and enhance the heat exchange between the heat exchange tube 21 and the high-temperature smoke.

[0106] For example, see Fig.11 When the condensing heat exchanger is working, the high-temperature flue gas first enters the heat insulation cover 3 from the smoke inlet 12, and the smoke coming out of the heat insulation cover 3 goes up along the smoke inlet channel 112, and enters the first space 1131 from top to bottom from the outlet end of the smoke inlet channel 112, and the smoke exchanges heat with the heat exchange tube 21 in the first space 1131; after the smoke flows out from the outlet of the first space 1131, it enters the second space 1132 from bottom to top, and the smoke exchanges heat with the heat exchange tube 21 in the second space 1132; finally, the smoke flows out from the exhaust pipe 4 through the exhaust port 13.

[0107] Embodiment 2

[0108] This embodiment provides a water heater, including the condensing heat exchanger of the first embodiment.

[0109] Specifically, the water heater includes a burner and a main heat exchanger. The burner is located at the lower side of the main heat exchanger to heat the main heat exchanger. The smoke outlet of the main heat exchanger is communicated with the smoke inlet 12 .

[0110] Specifically, the burner is located in the combustion chamber of the water heater, and the combustion chamber is located below the main heat exchanger. The burner can burn to heat the main heat exchanger, and the flue gas generated by the burner can enter the heat exchange chamber 11 of the condensing heat exchanger through the smoke inlet 12, thereby preheating the water in the heat exchange tube 21.

[0111] Specifically, the water heater is a gas water heater.

[0112] When assembling the condensing heat exchanger of the heat exchanger, the heat exchange tube assembly 2 is installed in the condensing box 1, and the rotation limiting plane 2211 of the inlet and outlet water joints 22 at the water inlet end of the heat exchange tube 21 is abutted against the corresponding rotation limiting surface 141, and the rotation limiting surface 141 can limit the rotation of the inlet and outlet water joints 22 at the water inlet end; the rotation limiting plane 2211 of the inlet and outlet water joints 22 at the water outlet end of the heat exchange tube 21 is abutted against the corresponding rotation limiting surface 141, and the rotation limiting surface 141 can limit the rotation of the inlet and outlet water joints 22 at the water outlet end.

[0113] With such arrangement, when the inlet and outlet water joints 22 are fixed to the condensation box 1 by means of the bolt and nut assembly, it is not necessary to weld fixings to the heat exchange tube assembly 2 to limit the rotation of the two inlet and outlet water joints 22, so as to avoid welding through the heat exchange tube 21 during welding.

[0114] In the water heater, the smoke inlet channel 112 of the condensing heat exchanger is close to the front of the water heater, and the heat exchange tube assembly installation cavity 113 is close to the back of the water heater. This arrangement can prevent the small amount of condensed water that has not been discharged during the trial operation from flowing back into the main heat exchanger of the water heater when the water heater is turned over during transportation. Since the condensed water is weakly acidic, flowing back into the main heat exchanger will cause corrosion damage to the main heat exchanger.

[0115] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0116] The specific contents of the above specific implementations only express several implementations of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. Condensing heat exchanger, characterized in that: include: A condensation box (1), wherein a heat exchange chamber (11) is arranged in the condensation box (1), a smoke inlet (12) and a smoke exhaust port (13) which are in communication with the heat exchange chamber (11) are arranged on the condensation box (1), a rotation limiting boss (14) is arranged on the inner wall of the condensation box (1), and a rotation limiting surface (141) is arranged on the rotation limiting boss (14); A heat exchange tube assembly (2) comprises a heat exchange tube (21), wherein the water inlet and water outlet ends of the heat exchange tube (21) are both provided with water inlet and water outlet joints (22), and the water inlet and water outlet joints (22) are provided with rotation limiting planes (2211), and the rotation limiting planes (2211) of each of the water inlet and water outlet joints (22) can abut against one of the rotation limiting surfaces (141).

2. The condensing heat exchanger according to claim 1, characterized in that: The inner wall of the condensation box (1) is provided with two rotation limiting bosses (14), and the two rotation limiting bosses (14) are arranged in one-to-one correspondence with the two water inlet and outlet joints (22), and the rotation limiting plane (2211) of each water inlet and outlet joint (22) can abut against the rotation limiting surface (141) of the corresponding rotation limiting boss (14); or The inner wall of the condensation box (1) is provided with a rotation limiting boss (14), and opposite sides of the rotation limiting boss (14) are respectively provided with a rotation limiting surface (141), and the two rotation limiting surfaces (141) are arranged in a one-to-one correspondence with the two water inlet and outlet joints (22), and the rotation limiting plane (2211) of each water inlet and outlet joint (22) can abut against its corresponding rotation limiting surface (141).

3. The condensing heat exchanger according to claim 1, characterized in that: A first smoke baffle (111) is arranged in the heat exchange chamber (11), the first smoke baffle (111) divides the heat exchange chamber (111) into a smoke inlet channel (112) and a heat exchange tube assembly installation chamber (113) which are connected at the top, and the heat exchange tube assembly (2) is installed in the heat exchange tube assembly installation chamber (113); Along the flow direction of the smoke, the flow area of ​​the smoke inlet channel (112) gradually decreases, the smoke inlet port (12) is connected to the entrance of the smoke inlet channel (112), and the outlet of the heat exchange tube assembly installation cavity (113) is connected to the smoke exhaust port (13).

4. The condensing heat exchanger according to claim 3, characterized in that: A heat insulation cover (3) with openings at both ends is provided at the entrance of the smoke inlet channel (112), and a gap exists between the outer side surface of the heat insulation cover (3) and the inner side surface of the smoke inlet channel (112).

5. The condensing heat exchanger according to claim 4, characterized in that: One of the heat insulation cover (3) and the condensation box (1) is provided with a buckle (31), and the other is provided with a buckle hole (151) for buckling with the buckle (31).

6. The condensing heat exchanger according to claim 3, characterized in that: A second smoke baffle (114) is also provided in the heat exchange tube assembly installation cavity (113), and the second smoke baffle (114) divides the heat exchange tube assembly installation cavity (113) into a first space (1131) and a second space (1132); a portion of the heat exchange tubes (21) of the heat exchange tube assembly (2) are located in the first space (1131), and the rest of the heat exchange tubes (21) are located in the second space (1132); the outlet of the smoke inlet channel (112) is connected to the upper part of the first space (1131), the lower part of the first space (1131) is connected to the lower part of the second space (1132), and the upper part of the second space (1132) is connected to the smoke exhaust port (13).

7. The condensing heat exchanger according to claim 6, characterized in that: The inlet end of the heat exchange tube (21) is located in the second space (1132), and the outlet end of the heat exchange tube (21) is located in the first space (1131).

8. The condensing heat exchanger according to claim 6, characterized in that: The heat exchange tube assembly installation cavity (113) is provided with a plug-in groove (1133) for plugging and matching with the second smoke baffle (114).

9. The condensing heat exchanger according to any one of claims 3 to 8, characterized in that: The ratio of the minimum flow area of ​​the smoke inlet channel (112) to the flow area of ​​the smoke exhaust port (13) is 1-1.

2.

10. A water heater, characterized in that It comprises a condensing heat exchanger as described in any one of claims 1 to 9.

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