Condensation heat exchange device and gas water heater

Abstract

The utility model belongs to the technical field of water heaters, and discloses a condensation heat exchange device and a gas water heater, the condensation heat exchange device comprises a smoke exhaust shell, a mist exhaust shell and a limiting structure, and a mist exhaust channel is formed in the mist exhaust shell; the smoke exhaust shell is arranged outside the mist exhaust shell in a sleeving mode and fixed to the mist exhaust shell through screws, and a smoke exhaust channel is formed between the smoke exhaust shell and the mist exhaust shell. The limiting structure is arranged on the smoke exhaust shell and the mist exhaust shell and comprises a first limiting block and a first limiting groove which are matched in an up-and-down inserted mode, and a second limiting block and a second limiting groove which are matched in an up-and-down inserted mode, and the first limiting block and the second limiting block are arranged in an up-and-down spaced mode. The depth and the circumferential angle of the portion, stretching into the smoke exhaust shell, of the mist exhaust shell and the angle of the central axis of the mist exhaust shell can be limited. The condensation heat exchange device and the gas water heater comprising the condensation heat exchange device are high in disassembly and assembly efficiency.

Description

Technical Field

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

[0002] The working principle of a condensing gas water heater is as follows: the flue gas that has been cooled by heat exchange in the main heat exchanger is sent into the condensing shell of the condensing heat exchange device. Before the cold water is sent into the main heat exchanger, it is first sent into the condensing heat exchange tube of the condensing heat exchange device so that the flue gas in the condensing shell can preheat the cold water.

[0003] During this process, water vapor in the flue gas is condensed into condensate, which continuously accumulates at the bottom of the condenser shell. One commonly used method for condensate treatment is to install an atomizing unit at the bottom of the condenser shell. The atomizing unit atomizes the condensate into water mist, and the flue gas after heat exchange enters the mist exhaust shell, carrying the water mist from the exhaust shell out of the condenser shell.

[0004] To achieve flue gas diversion and prevent all flue gas from entering the mist exhaust housing and increasing pressure, and to prevent the water mist from recondensing during its ascent, thus reducing the efficiency of condensate discharge, a smoke exhaust housing is also installed outside the mist exhaust housing. A smoke exhaust channel is formed between the smoke exhaust housing and the mist exhaust housing. Part of the flue gas after heat exchange enters the mist exhaust housing and is discharged with the water mist, while the other part enters the smoke exhaust channel to insulate and heat the mist exhaust housing, preventing the water mist from condensing and liquefying too quickly, and reducing the air pressure inside the mist exhaust housing, thereby reducing the inhibition effect on water mist formation in the atomization unit.

[0005] When the mist exhaust housing is assembled inside the smoke exhaust housing, in order to make the mist exhaust housing and the smoke exhaust housing coaxial and thus ensure that the flue gas at the same height in the smoke exhaust channel has the same flow velocity, the mist exhaust housing and the smoke exhaust housing are usually connected by multiple sets of screws spaced at intervals. This makes the assembly of the condensing heat exchanger complicated and inefficient. Utility Model Content

[0006] One of the technical problems solved by this utility model is to provide a condensation heat exchange device that can reduce the use of screws and improve the assembly and disassembly efficiency of the smoke exhaust shell and the mist exhaust shell.

[0007] The second technical problem solved by this utility model is to provide a gas water heater that can reduce the use of screws and improve assembly efficiency.

[0008] The first technical problem mentioned above is solved by the following technical solution:

[0009] A condensing heat exchange device includes a mist exhaust shell, a smoke exhaust shell, and a limiting structure. A mist exhaust channel is formed within the mist exhaust shell. The smoke exhaust shell is fitted over the mist exhaust shell, and a smoke exhaust channel is formed between the smoke exhaust shell and the mist exhaust shell. The limiting structure includes a first limiting block, a second limiting block, a first limiting groove, and a second limiting groove. One of the first limiting block and the first limiting groove is located at one end of the smoke exhaust shell, and the other is located at one end of the mist exhaust shell. One of the second limiting block and the second limiting groove is located at the other end of the smoke exhaust shell, and the other is located at the other end of the mist exhaust shell. The first limiting block and the first limiting groove are vertically interlocked, and the second limiting block and the second limiting groove are vertically interlocked to limit the depth to which the mist exhaust shell extends into the smoke exhaust shell. The mist exhaust shell is fixed to the smoke exhaust shell by screws.

[0010] The condensation heat exchange device described in this utility model has the following advantages compared with the prior art:

[0011] When assembling the mist exhaust housing and the smoke exhaust housing, the first limiting block and the first limiting groove, as well as the second limiting block and the second limiting groove, which interlock, circumferentially limit the mist exhaust housing, ensuring that the first mounting hole and the second mounting hole on the mist exhaust housing are at the same angle. Furthermore, the first and second limiting grooves also limit the depth to which the mist exhaust housing extends into the smoke exhaust housing, ensuring that the first and second mounting holes on the mist exhaust housing are at the same height, reducing the difficulty of inserting screws into the first and second mounting holes. Moreover, the fact that one end of the mist exhaust housing is limited by the interlocking first limiting block and the first limiting groove, and the other end by the interlocking second limiting block and the second limiting groove, also keeps the central axis angle of the mist exhaust housing constant. Therefore, only a small number of screws are needed to limit the reverse movement of the mist exhaust housing along the direction in which it is assembled with the smoke exhaust housing, reducing the number of screws used.

[0012] In one embodiment, at least one of the first limiting groove and the second limiting groove is closed on one side of the two sides that are opposite to each other in the vertical direction to limit the depth of the mist exhaust housing into the smoke exhaust housing, and / or, the cross-sectional area of ​​the end of the first limiting groove into which the first limiting block is inserted is greater than the cross-sectional area of ​​the other end of the first limiting groove; and / or, the cross-sectional area of ​​the end of the second limiting groove into which the second limiting block is inserted is greater than the cross-sectional area of ​​the other end of the second limiting groove.

[0013] In one embodiment, the first limiting groove, the first limiting block, the second limiting groove, and the second limiting block are all wedge-shaped.

[0014] In one embodiment, a bolt fixing post is provided on one of the smoke exhaust housing and the mist exhaust housing, the bolt fixing post abutting against the other of the smoke exhaust housing and the mist exhaust housing, and a mounting hole for the screw to pass through is provided on the bolt fixing post.

[0015] In one embodiment, multiple first limiting blocks and / or second limiting blocks are provided at circumferential intervals along the mist exhaust housing.

[0016] In one embodiment, the condensation heat exchange device further includes a condensation shell; the upper end of the mist exhaust shell extends out of the condensation shell and communicates with the atmosphere, the lower end of the mist exhaust shell is located inside the condensation shell and communicates with the inner cavity of the condensation shell, and the outer wall of the smoke exhaust shell is provided with protruding ribs, the ribs extending in the vertical direction and abutting against the condensation shell, and / or,

[0017] The upper end of the exhaust housing extends out of the condenser housing and connects to the atmosphere. The lower end of the exhaust housing is located inside the condenser housing and connects to the inner cavity of the condenser housing. A connecting plate is arranged around the outer side wall of the exhaust housing. The connecting plate is connected to the top of the condenser housing by screws. A first sealing ring is provided between the connecting plate and the condenser housing.

[0018] In one embodiment, a first receiving groove is provided on one of the condensing shell and the connecting plate, and the first sealing ring is embedded in the first receiving groove and abuts against the other of the condensing shell and the connecting plate. The side of the first sealing ring facing away from the bottom of the first receiving groove and / or the bottom of the first receiving groove is provided with an annular protrusion.

[0019] In one embodiment, the condensing heat exchange device further includes a transition pipe and a flue pipe. The transition pipe is inserted into and fitted with the flue pipe and the exhaust housing. A second sealing ring is provided between the transition pipe and the exhaust housing. An annular second receiving groove is provided on one of the transition pipe and the exhaust housing. The second sealing ring is embedded in the second receiving groove and abuts against the transition pipe and the exhaust housing. And / or, a third sealing ring is provided between the transition pipe and the flue pipe. An annular third receiving groove is provided on one of the transition pipe and the flue pipe. The third sealing ring is embedded in the third receiving groove and abuts against the transition pipe and the flue pipe.

[0020] In one embodiment, a first sealing sheet protrudes from one side of the second sealing ring away from the bottom of the second receiving groove, and the first sealing sheet is inclined upward toward the central axis of the transition tube; a second sealing sheet protrudes from one side of the third sealing ring away from the bottom of the second receiving groove, and the second sealing sheet is inclined downward toward the central axis of the transition tube.

[0021] The second technical problem mentioned above is solved by the following technical solution:

[0022] A gas water heater includes a main heat exchanger and a condensing heat exchange device as described above, wherein the inlet and outlet of the main heat exchanger are both connected to the condensing heat exchange device.

[0023] Compared with the prior art, the condensing gas water heater of this utility model has the following advantages:

[0024] The condensing gas water heater provided by this utility model reduces the difficulty of fixing screws to the exhaust housing and the mist exhaust housing by means of a first limiting block and a first limiting groove that cooperate with each other, as well as a second limiting block and a second limiting groove that cooperate with each other. At the same time, it reduces the use of screws and increases the difficulty of disassembling and assembling the condensing gas water heater. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural schematic diagram of the condensation heat exchange device provided in this embodiment of the utility model;

[0026] Figure 2 This is a cross-sectional view of the condensation heat exchange device provided in this embodiment of the utility model from one angle;

[0027] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 yes Figure 2 Enlarged view of point B in the middle;

[0029] Figure 5 yes Figure 2 Enlarged view of point C in the middle;

[0030] Figure 6 This is a schematic diagram of the structure of the first sealing ring provided in this embodiment of the utility model;

[0031] Figure 7 This is a cross-sectional view of the condensation heat exchange device provided in this embodiment of the utility model from another angle;

[0032] Figure 8 This is a schematic diagram of the structure of the smoke exhaust housing provided in this embodiment of the utility model;

[0033] Figure 9 yes Figure 8 Enlarged structural diagram at point D;

[0034] Figure 10 yes Figure 8 Enlarged structural diagram at point E;

[0035] Figure 11 This is a schematic diagram of the structure of the mist exhaust housing provided in this embodiment of the utility model;

[0036] Figure 12 yes Figure 11 Enlarged structural diagram at point F;

[0037] Figure 13 This is a schematic diagram of the structure of the third sealing ring provided in this embodiment of the utility model.

[0038] In the picture:

[0039] 1. Condenser housing; 11. First flue gas inlet; 12. First receiving tank;

[0040] 2. Condensing heat exchange tubes;

[0041] 3. Atomizing housing; 31. Water inlet; 32. Mist outlet;

[0042] 4. Atomizing unit;

[0043] 5. Mist exhaust housing; 51. Mist inlet; 52. Mist exhaust channel; 53. Second mounting hole; 54. Bolt fixing post; 55. First limiting groove; 56. Second limiting block;

[0044] 6. Smoke exhaust housing; 61. First mounting hole; 62. Rib; 63. Connecting plate; 64. First limiting block; 65. Second limiting groove;

[0045] 7. Smoke exhaust duct;

[0046] 8. First sealing ring; 81. Protrusion;

[0047] 9. Second sealing ring; 91. First sealing plate;

[0048] 10. Third sealing ring; 101. Second sealing plate;

[0049] 20. Transition pipe; 201. Second receiving groove; 202. Third receiving groove;

[0050] 30. Screws;

[0051] 40. Connecting sleeve. Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0053] In the description of this application, it should be understood that the terms "center", "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0054] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0055] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0056] like Figures 1 to 13 As shown, an embodiment of this utility model provides a condensing heat exchange device and a gas water heater. The gas water heater includes a condensing heat exchange device, a main heat exchanger, and a burner. The burner can generate high-temperature flue gas, and the water in the main heat exchanger can exchange heat with the high-temperature flue gas to form hot water. At the same time, the condensing heat exchange device can use the flue gas after exchanging heat with the water in the main heat exchanger to preheat the cold water entering the main heat exchanger, thereby making full use of the heat in the flue gas and improving the heat exchange efficiency.

[0057] refer to Figure 2As shown, the condensing heat exchange device includes a condensing shell 1, a condensing heat exchange tube 2, an atomizing shell 3, an atomizing unit 4, a flue gas shell 6, and a mist exhaust shell 5. The main body of the condensing heat exchange tube 2 is located inside the condensing shell 1, and its two ends extend out of the condensing shell 1. The inlet end of the condensing heat exchange tube 2 is connected to an external cold water supply pipe, and the outlet end of the condensing heat exchange tube 2 is connected to the inlet end of the main heat exchanger. The condensing shell 1 is also provided with a first flue gas inlet 11, and the condensing shell 1 is connected to the flue gas outlet end of the main heat exchanger through the first flue gas inlet 11. The atomizing housing 3 is located at the lower end of the condensing housing 1. The atomizing housing 3 has an inlet 31 and an outlet 32 ​​that connect to the condensing housing 1. The atomizing unit 4 is located inside the atomizing housing 3 and is used to atomize the condensate formed after the flue gas has been heated by the condensing heat exchange tube 2. The condensate enters the atomizing housing 3 through the inlet 31 and, after atomization, enters the condensing housing 1 through the outlet 32. The mist exhaust housing 5 is located on one side of the condensing heat exchange tube 2. Its upper end extends out of the condensing housing 1 and is connected to the outside atmosphere. The lower end of the mist exhaust housing 5 is located inside the condensing housing 1 and has an inlet 51. The outlet 32 ​​is located below the inlet 51 so that the water mist formed by the atomizing unit 4 can enter the mist exhaust housing 5. The smoke exhaust housing 6 is fixedly sleeved outside the mist exhaust housing 5, and the upper end of the smoke exhaust housing 6 also extends out of the condensation housing 1, while the lower end is located inside the condensation housing 1 and communicates with the inner cavity of the condensation housing 1. A smoke exhaust channel 7 is formed between the smoke exhaust housing 6 and the mist exhaust housing 5, and the smoke exhaust channel 7 is connected to the outside atmosphere and the inner cavity of the condensation housing 1.

[0058] The high-temperature flue gas generated by the burner exchanges heat in the main heat exchanger and then enters the condenser shell 1 through the first flue gas inlet 11. It exchanges heat with the low-temperature water in the condenser heat exchange tube 2 and forms condensate. The condensate enters the atomizing shell 3 through the water inlet 31. Under the action of the atomizing unit 4, the condensate is atomized to form water mist and enters the mist exhaust channel 52 formed in the mist exhaust shell 5 through the mist outlet 32 ​​and the mist inlet 51. Some flue gas also enters the mist exhaust channel 52 and mixes with the water mist and is discharged through the top of the mist exhaust shell 5. The other part of the flue gas enters the exhaust channel 7 and is discharged from the exhaust channel 7. The flue gas entering the exhaust channel 7 keeps the mist exhaust shell 5 warm and prevents the water mist in the mist exhaust channel 52 from condensing and flowing back, thus improving the water mist discharge efficiency.

[0059] refer to Figure 2 and Figure 4As shown, the exhaust housing 6 has a first mounting hole 61, and the mist exhaust housing 5 has a corresponding second mounting hole 53. Screws 30 pass through the first mounting hole 61 and the second mounting hole 53, achieving a fixed and detachable connection between the exhaust housing 6 and the mist exhaust housing 5. Obviously, it is simpler for the screws 30 to pass through from the outside in; therefore, at least the second mounting hole 53 is a threaded hole. Specifically, the exhaust housing 6 or the mist exhaust housing 5 is provided with a bolt fixing post 54. One end of the bolt fixing post 54 is fixedly connected to one of the exhaust housing 6 and the mist exhaust housing 5, while the other end abuts against the other of the exhaust housing 6 and the mist exhaust housing 5. The first mounting hole 61 or the second mounting hole 53 penetrates the bolt fixing post 54. The bolt fixing post 54 can increase the contact area between the bolt and the exhaust housing 6 or the mist exhaust housing 5 without increasing the shell thickness of the exhaust housing 6 and the mist exhaust housing 5, reducing the possibility of damage to the exhaust housing 6 or the mist exhaust housing 5 when subjected to non-axial external forces from the bolt. Meanwhile, the bolt fixing post 54 can also improve the radial stability between the smoke exhaust housing 6 and the mist exhaust housing 5, so that the radial width of the smoke exhaust channel 7 formed between the smoke exhaust housing 6 and the mist exhaust housing 5 is consistent with the preset width. For example, the bolt fixing post 54 is provided on the outer wall of the mist exhaust housing 5, and its end away from the mist exhaust housing 5 abuts against the inner wall of the smoke exhaust housing 6.

[0060] In order to reduce the number of screws 30 used and to align the first mounting hole 61 and the corresponding second mounting hole 53 in advance to reduce the difficulty of bolt installation, a limiting structure is provided between the smoke exhaust housing 6 and the mist exhaust housing 5 to limit the movement of the mist exhaust housing 5.

[0061] refer to Figures 2-4 as well as Figures 8-12 As shown, the limiting structure includes a first limiting block 64, a second limiting block 56, a first limiting groove 55, and a second limiting groove 65. One of the first limiting block 64 and the first limiting groove 55 is located at one end of the smoke exhaust housing 6, and the other is located at one end of the mist exhaust housing 5. One of the second limiting block 56 and the second limiting groove 65 is located at the other end of the smoke exhaust housing 6, and the other is located at the other end of the mist exhaust housing 5. The first limiting block 64 and the first limiting groove 55 are vertically inserted and engaged, and the second limiting block 56 and the second limiting groove 65 are vertically inserted and engaged, so as to limit the depth of the mist exhaust housing 5 extending into the smoke exhaust housing 6 in the vertical direction.

[0062] When assembling the exhaust housing 6 and the mist exhaust housing 5, the mist exhaust housing 5 is gradually inserted into the exhaust housing 6 from one end. The first limiting block 64 is inserted into the first limiting groove 55, and the second limiting block 56 is inserted into the second limiting groove 65, thereby limiting the circumferential and longitudinal directions of the mist exhaust housing 5. At this time, the first mounting hole 61 and the corresponding second mounting hole 53 are opposite each other, reducing the difficulty of inserting the screw 30 into the first mounting hole 61 and the second mounting hole 53. Moreover, one end of the mist exhaust housing 5 is limited by the first limiting block 64 and the first limiting groove 55 through the insertion and cooperation, and the other end of the mist exhaust housing 5 is limited by the second limiting block 56 and the second limiting groove 65 through the insertion and cooperation. This also keeps the central axis angle of the mist exhaust housing 5 unchanged. Therefore, only the screw 30 is needed to prevent the mist exhaust housing 5 from detaching from the mist exhaust housing 5 in the opposite direction of the assembly direction. As a result, the number of screws 30 used is reduced, making disassembly and assembly convenient, thereby reducing the difficulty of maintenance of the condensing heat exchange device and the gas water heater in the later stage.

[0063] For example, four bolt fixing posts 54 are provided, arranged in pairs on two opposite side walls of the exhaust housing 5. Correspondingly, four first mounting holes 61 and four second mounting holes 53 are provided, arranged in pairs. Four first limiting blocks 64 and four first limiting grooves 55 are arranged in an array along the circumference of the exhaust housing 5, and four second limiting blocks 56 and four second limiting grooves 65 are also arranged at intervals along the circumference of the exhaust housing 5, to further limit the radial movement of the exhaust housing 5, thereby maintaining the smoke exhaust channel 7 at a predetermined size.

[0064] It is understood that the number of first limit blocks 64 and second limit blocks 56 is not limited to four each, but can also be two, three or more. Multiple first limit blocks 64 together constitute a first limit block group, and multiple second limit blocks 56 together constitute a second limit block group.

[0065] refer to Figure 2 and Figure 6 As shown, in one embodiment, the mist exhaust housing 5 includes a mist inlet section, a mist exhaust transition section, and a mist outlet section connected sequentially from bottom to top. The effective flow area of ​​the mist exhaust transition section gradually decreases from one end connected to the mist inlet section to the other end, so as to increase the mist discharge speed while avoiding abrupt changes in the effective flow area of ​​the atomizing housing 3. For the same purpose, the smoke exhaust housing 6 includes a smoke inlet section, a smoke exhaust transition section, and a smoke exhaust section connected sequentially from bottom to top. The effective flow area of ​​the smoke exhaust transition section gradually decreases from one end connected to the smoke inlet section to the other end. Based on the above configuration, the mist exhaust housing 5 can only be assembled into the smoke exhaust housing 6 from bottom to top, that is, the assembly direction of the mist exhaust housing 5 is from bottom to top. Exemplarily, the mist inlet section and the smoke inlet section are both rectangular, while the mist outlet section and the smoke outlet section are circular.

[0066] In one embodiment, the first limiting block 64 is disposed on the inner wall of the smoke exhaust housing 6, and the first limiting groove 55 is disposed on the outer wall of the mist exhaust housing 5. The first limiting groove 55 extends to the upper end face of the mist exhaust housing 5, that is, the upper end opening of the first limiting groove 55. When the mist exhaust housing 5 is assembled onto the smoke exhaust housing 6 from bottom to top, the first limiting block 64 is inserted into the first limiting groove 55 from top to bottom.

[0067] In another embodiment, the first limiting block 64 can also be disposed on the outer wall of the mist exhaust housing 5, while the first limiting groove 55 is disposed on the inner wall of the smoke exhaust housing 6. In this case, the first limiting groove 55 is disposed in the smoke exhaust section and the lower end of the first limiting groove 55 extends to the smoke exhaust transition section and opens.

[0068] Continue to refer to Figure 2 and Figure 6 As shown, in one embodiment, the mist exhaust housing 5 further includes a guide section connected to the mist inlet section away from the mist outlet section. The guide section is located outside the smoke exhaust housing 6 and is configured as a cone with an effective flow area that gradually increases from one end connected to the mist inlet section to one end of the atomizing housing 3, in order to guide water mist into the mist exhaust housing 5. Based on this, a second limiting block 56 is disposed on the outer wall of the mist exhaust housing 5, and a second limiting groove 65 is disposed on the smoke exhaust housing 6, extending to the lower end face of the smoke exhaust housing 6, i.e., the lower end opening of the second limiting groove 65. When the mist exhaust housing 5 is assembled onto the smoke exhaust housing 6 from bottom to top, the second limiting block 56 is inserted into the second limiting groove 65 from bottom to top.

[0069] In one embodiment, the distance between the second limiting block and the first mounting hole 61 along the length of the exhaust housing 5 is less than the distance between the first limiting block and the first mounting hole 61. It is understood that the second limiting block 56 can be located on the same side as the first mounting hole 61 or on a different side from the second mounting hole 53; no specific limitation is made here. It is worth emphasizing that, based on the arrangement of the second limiting block 56 on the outer wall of the exhaust housing 5 and the second limiting groove 65 on the smoke exhaust housing 6, the two opposite ends of the second limiting groove 65, arranged radially along the smoke exhaust housing 6, penetrate the smoke exhaust housing 6 to increase the contact area between the second limiting block 56 and the second limiting groove 65, further improving the limiting stability of the exhaust housing 5 and the smoke exhaust housing 6. Specifically, the second limiting groove 65 and the second limiting block 56 have the same shape and size to prevent flue gas from flowing out of the smoke exhaust channel 7 from the second limiting groove 65.

[0070] It is understood that in other embodiments, multiple cooperating second limiting grooves 65 and second limiting blocks 56 can radially limit the mist exhaust housing 5. For example, when the second limiting block 56 is disposed on the mist exhaust housing 5, its end face away from the mist exhaust housing 5 abuts against the bottom of the second limiting groove 65, that is, one side of the second limiting groove 65 that is radially opposite to the mist exhaust housing 5 is closed. In one embodiment, at least one of the first limiting groove 55 and the second limiting groove 65 is closed on one side of the two sides that are radially opposite to each other in the vertical direction, so as to limit the depth of the mist exhaust housing 5 extending into the smoke exhaust housing 6.

[0071] Or, refer to Figure 11 As shown, a first guide surface is formed on the groove wall of the first limiting groove 55. The first guide surface gradually approaches the groove wall opposite to the first limiting block 64 from one end of the first limiting groove 55 into which the first limiting block 64 is inserted. That is, the cross-sectional area of ​​the end of the first limiting groove 55 into which the first limiting block 64 is inserted is larger than the cross-sectional area of ​​the other end. This reduces the difficulty of inserting the first limiting block 64 into the first limiting groove 55 while limiting the depth of the mist exhaust housing 5 into the smoke exhaust housing 6.

[0072] In one embodiment, the first limiting groove 55 is configured as a wedge-shaped groove and the first limiting block 64 is configured as a wedge-shaped block. In addition to serving as a guide, the first guide surface on the first limiting groove 55 can also cooperate to clamp the first limiting block 64, thereby further improving the stability of the connection between the mist exhaust housing 5 and the smoke exhaust housing 6.

[0073] Similarly, see reference Figure 10 As shown, a second guide surface is formed on the groove wall of the second limiting groove 65. The second guide surface gradually approaches the opposite side wall from the end into which the second limiting block 56 is inserted. That is, the cross-sectional area of ​​the end of the second limiting groove 65 into which the second limiting block 56 is inserted is larger than the cross-sectional area of ​​the other end, so as to reduce the difficulty of inserting the second limiting block 56 into the second limiting groove 65. For example, the second limiting groove 65 and the second limiting block 56 are also wedge-shaped.

[0074] Furthermore, in order to improve the structural strength of the second limiting block 56, a reinforcing rib is provided on the side of the second limiting block 56 away from the second limiting groove 65, and the reinforcing rib is arranged perpendicular to the second limiting block 56.

[0075] refer to Figure 8As shown, the outer wall of the exhaust housing 6 is provided with protruding ribs 62, which extend vertically and abut against the condenser housing 1. Besides strengthening the structural strength of the exhaust housing 6, the protruding ribs 62 also prevent deformation of the condenser housing 1 or the exhaust housing 6 from affecting the distance between them. A stable distance between the exhaust housing 6 and the condenser housing 1 facilitates the circumferential entry of flue gas into the exhaust channel 7 and the mist channel 52, improving exhaust and mist removal efficiency.

[0076] refer to Figure 2 and Figure 5 As shown, a connecting plate 63 is arranged around the outer wall of the exhaust housing 6, and the connecting plate 63 is connected to the top of the condenser housing 1 by screws 30. To ensure the sealing of the inner cavity of the condenser housing 1, a first sealing ring 8 is provided between the connecting plate 63 and the top end face of the outer shell. Specifically, a first receiving groove 12 is provided on one of the condenser housing 1 and the connecting plate 63, and the first sealing ring 8 is embedded in the first receiving groove 12 and abuts against the other of the condenser housing 1 and the connecting plate 63. The first receiving groove 12 prevents the first sealing ring 8 from shifting, thereby preventing the seal between the exhaust housing 6 and the condenser housing 1 from failing.

[0077] In one embodiment, the first receiving groove 12 is disposed on the condenser housing 1, and the first sealing ring 8 abuts against the connecting plate 63. Based on this, refer to Figure 5 and Figure 6 As shown, to further improve the sealing performance, an annular protrusion 81 is provided on the top surface of the first sealing ring 8, i.e., the side facing the connecting plate 63, and the protrusion 81 abuts against the lower surface of the connecting plate 63; or, an annular protrusion 81 is provided at the bottom of the first receiving groove 12, and the protrusion 81 abuts against the first sealing ring 8. For example, at least two protrusions 81 are provided at intervals.

[0078] In another embodiment, the first receiving groove 12 is disposed on the connecting plate 63. In this case, the first sealing ring 8 or the bottom of the first receiving groove 12 can also be provided with a protrusion 81, wherein the protrusion 81 provided on the first sealing ring 8 abuts against the condenser shell 1, and the protrusion 81 provided on the first receiving groove 12 abuts against the first sealing ring 8.

[0079] Of course, protrusions 81 can be provided on the bottom of the first receiving groove 12 and the first sealing ring 8 at the same time, which will not be explained in detail here.

[0080] refer to Figure 2As shown, the condensing heat exchanger also includes a transition pipe 20, which is located at the top of the exhaust housing 6 and connects the exhaust housing 6 and the flue pipe. The transition pipe 20 is inserted into both the exhaust housing 6 and the flue pipe, making assembly and disassembly simple. A second sealing ring 9 is provided between the transition pipe 20 and the exhaust housing 6, and a third sealing ring 10 is provided between the transition pipe 20 and the flue pipe. By providing two sealing rings to seal the connection points of the transition pipe 20 to the exhaust housing 6 and the flue pipe respectively, the connection points can be effectively sealed. The tight-fitting structure compresses the sealing rings to achieve a good seal.

[0081] Specifically, refer to Figure 2 and Figure 3 As shown, one of the transition pipe 20 and the smoke exhaust housing 6 is provided with an annular second receiving groove 201, and one of the transition pipe 20 and the smoke pipe is provided with an annular third receiving groove 202. The second sealing ring 9 and the third sealing ring 10 are respectively embedded in the second receiving groove 201 and the third receiving groove 202. The second receiving groove 201 can limit the position of the second sealing ring 9 to prevent the second sealing ring 9 from shifting when the transition pipe 20 is inserted into the smoke exhaust housing 6, which would cause the seal to fail. The third receiving groove 202 limits the position of the third sealing ring 10 to prevent the third sealing ring 10 from shifting when the transition pipe 20 is inserted into the smoke pipe, which would cause the seal to fail.

[0082] It is understandable that the transition pipe 20 is inserted into the smoke exhaust housing 6 from top to bottom. Based on this, refer to Figure 3 and Figure 13 As shown, the second sealing ring 9 has two first sealing pieces 91 protruding from the side of the groove bottom away from the second receiving groove 201, which are aligned with the insertion direction of the transition tube 20; at the same time, the transition tube 20 is inserted into the flue from bottom to top, and the third sealing ring 10 has two second sealing pieces 101 protruding from the side of the groove bottom away from the second receiving groove 201, which are aligned with the insertion direction of the transition tube 20.

[0083] For example, if the second receiving groove 201 is provided on the transition pipe 20, then the first sealing plate 91 is provided on the side of the second sealing ring 9 facing the smoke exhaust housing 6, and the first sealing plate 91 is inclined upwards; if the second receiving groove 201 is provided on the smoke exhaust housing 6, then the first sealing plate 91 is provided on the side of the second sealing ring 9 facing the transition pipe 20, and the first sealing plate 91 is inclined downwards. Similarly, if the third receiving groove 202 is provided on the transition pipe 20, then the second sealing plate 101 is inclined downwards; if the third receiving groove 202 is provided on the smoke pipe, then the second sealing plate 101 is inclined upwards. In summary, the first sealing plate 91 gradually tilts upwards towards the central axis of the transition pipe 20; the second sealing plate 101 gradually tilts downwards towards the central axis of the transition pipe 20.

[0084] By setting the first sealing plate 91 and the second sealing plate 101 at an angle, the connection position can be sealed in accordance with the installation direction, reducing the displacement of the first sealing ring 8. Furthermore, the first sealing plate 91 and the second sealing plate 101 can increase the sealing area at this position and improve the sealing effect.

[0085] In one embodiment, the second receiving groove 201 and the third receiving groove 202 are both formed on the transition tube 20. The second receiving groove 201 and the third receiving groove 202 are both stamped to reduce the wall thickness of the transition tube 20, thereby reducing material costs and manufacturing costs.

[0086] In one embodiment, the lower end of the transition pipe 20 is fitted onto the smoke exhaust housing 6 to avoid affecting the size of the smoke exhaust channel 7, while the lower end of the transition pipe 20 is fitted onto the smoke pipe. Furthermore, a limiting step is provided on the outer wall of the smoke exhaust housing 6, and the lower end of the transition pipe 20, after being fitted onto the outside of the smoke exhaust housing 6, abuts against the limiting step, thereby restricting the insertion position of the transition pipe 20 and the smoke exhaust housing 6.

[0087] refer to Figure 4 As shown, in order to further improve the connection stability between the transition pipe 20 and the smoke exhaust housing 6, a connecting sleeve 40 is also provided between the transition pipe 20 and the smoke exhaust housing 6. The connecting sleeve 40 is sleeved on the outside of the transition pipe 20 and connected to the smoke exhaust housing 6 by screws 30.

[0088] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0089] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A condensation heat exchange device, comprising a mist exhaust shell (5) and a smoke exhaust shell (6), wherein a mist exhaust channel (52) is formed inside the mist exhaust shell (5), the smoke exhaust shell (6) is sleeved outside the mist exhaust shell (5), and a smoke exhaust channel (7) is formed between the smoke exhaust shell (6) and the mist exhaust shell (5) at an interval, characterized in that, The condensation heat exchanger also includes: The limiting structure includes a first limiting block (64), a second limiting block (56), a first limiting groove (55), and a second limiting groove (65); one of the first limiting block (64) and the first limiting groove (55) is disposed at one end of the exhaust housing (6), and the other of the first limiting block (64) and the first limiting groove (55) is disposed at one end of the mist exhaust housing (5); one of the second limiting block (56) and the second limiting groove (65) is disposed at the other end of the exhaust housing (6), and the other is disposed at the other end of the mist exhaust housing (5); the first limiting block (64) and the first limiting groove (55) are inserted into each other in the vertical direction, and the second limiting block (56) and the second limiting groove (65) are inserted into each other in the vertical direction to limit the depth of the mist exhaust housing (5) extending into the exhaust housing (6); the mist exhaust housing (5) is fixed to the exhaust housing (6) by screws (30).

2. The condensation heat exchanger according to claim 1, characterized in that, At least one of the first limiting groove (55) and the second limiting groove (65) is closed on one side of the two sides that are opposite each other in the vertical direction to limit the depth of the mist exhaust housing (5) extending into the smoke exhaust housing (6), and / or, the cross-sectional area of ​​the end of the first limiting groove (55) into which the first limiting block (64) is inserted is greater than the cross-sectional area of ​​the other end of the first limiting groove (55); and / or, the cross-sectional area of ​​the end of the second limiting groove (65) into which the second limiting block (56) is inserted is greater than the cross-sectional area of ​​the other end of the second limiting groove (65).

3. The condensation heat exchanger according to claim 2, characterized in that, The first limiting groove (55), the first limiting block (64), the second limiting groove (65) and the second limiting block (56) are all wedge-shaped.

4. The condensation heat exchanger according to claim 1, characterized in that, A bolt fixing post (54) is provided on one of the smoke exhaust housing (6) and the mist exhaust housing (5). The bolt fixing post (54) abuts against the other of the smoke exhaust housing (6) and the mist exhaust housing (5). A mounting hole for the screw (30) to pass through is provided on the bolt fixing post (54).

5. The condensation heat exchanger according to claim 1, characterized in that, The first limiting block (64) and / or the second limiting block (56) are provided in multiple circumferentially spaced along the mist exhaust housing (5).

6. The condensing heat exchanger according to any one of claims 1-5, characterized in that, The condensation heat exchange device further includes a condenser shell (1); the upper end of the mist exhaust shell (5) extends out of the condenser shell (1) and is connected to the atmosphere, the lower end of the mist exhaust shell (5) is located inside the condenser shell (1) and is connected to the inner cavity of the condenser shell (1), and the outer wall of the smoke exhaust shell (6) is provided with protruding ribs (62), the ribs (62) extend in the vertical direction and abut against the condenser shell (1), and / or, The upper end of the exhaust housing (6) extends through the condenser housing (1) and is connected to the atmosphere. The lower end of the exhaust housing (6) is located inside the condenser housing (1) and is connected to the inner cavity of the condenser housing (1). A connecting plate (63) is arranged around the outer wall of the exhaust housing (6). The connecting plate (63) is connected to the top of the condenser housing (1). A first sealing ring (8) is provided between the connecting plate (63) and the condenser housing (1).

7. The condensation heat exchanger according to claim 6, characterized in that, A first receiving groove (12) is provided on one of the condenser shell (1) and the connecting plate (63), and the first sealing ring (8) is embedded in the first receiving groove (12) and abuts against the other of the condenser shell (1) and the connecting plate (63); the side of the first sealing ring (8) facing away from the bottom of the first receiving groove (12) and / or the bottom of the first receiving groove (12) is provided with an annular protrusion (81).

8. The condensing heat exchanger according to any one of claims 1-5, characterized in that, The condensing heat exchange device further includes a transition pipe (20) and a flue pipe. The transition pipe (20) is inserted into the flue pipe and the exhaust shell (6). A second sealing ring (9) is provided between the transition pipe (20) and the exhaust shell (6). An annular second receiving groove (201) is provided on one of the transition pipe (20) and the exhaust shell (6). The second sealing ring (9) is embedded in the second receiving groove (201) and abuts against the transition pipe (20) and the exhaust shell (6). And / or, a third sealing ring (10) is provided between the transition pipe (20) and the smoke pipe; an annular third receiving groove (202) is provided on one of the transition pipe (20) and the smoke pipe, and the third sealing ring (10) is embedded in the third receiving groove (202) and abuts against the transition pipe (20) and the smoke pipe.

9. The condensation heat exchanger according to claim 8, characterized in that, The second sealing ring (9) has a first sealing piece (91) protruding from one side away from the bottom of the second receiving groove (201), and the first sealing piece (91) is inclined upward toward the central axis of the transition tube (20); the third sealing ring (10) has a second sealing piece (101) protruding from one side away from the bottom of the third receiving groove (202), and the second sealing piece (101) is inclined downward toward the central axis of the transition tube (20).

10. A gas-fired water heater, including a main heat exchanger, characterized in that, The gas water heater further includes a condensing heat exchange device as described in any one of claims 1-9, wherein the inlet end and the outlet end of the main heat exchanger are both connected to the condensing heat exchange device.

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