Secondary heat exchanger

Abstract

The utility model relates to the technical field of heat exchange devices, and provides a secondary heat exchanger which comprises an outer shell with an inner cavity, an outer plate and an inner plate, the inner cavity of the outer shell is of an opening structure and is provided with a positioning protruding point, the inner plate is positioned and installed on the positioning protruding point of the inner cavity of the outer shell, and the outer plate is installed on the outer side of the inner plate and presses the inner plate towards the positioning protruding point. And the shell is provided with a hooked edge for pressing the outer plate, so that the hooked edge of the shell and the positioning salient point clamp the outer plate and the inner plate. The outer side of the shell is provided with a hooked edge for pressing the outer plate so as to tightly press the inner plate and the outer plate, so that before entering a brazing furnace, the inner plate and the outer plate can be tightly pressed, a gap between the inner plate and the outer plate is reduced as much as possible, the distance between the inner plate and the outer plate is ensured to be within 0.1 mm in the brazing process, welding flux cannot flow away, the machining sealing performance of the secondary heat exchanger is good, and the service life of the secondary heat exchanger is prolonged. Smoke leakage can be avoided as much as possible in the heat exchange process.

Description

Technical Field

[0001] This utility model relates to the technical field of heat exchange devices, specifically to a secondary heat exchanger. Background Technology

[0002] The secondary heat exchanger utilizes high-temperature flue gas, which heats the liquid passing through it (heat exchange occurs between the flue gas and the liquid). During this process, flue gas leakage is crucial. The secondary heat exchanger consists of an outer shell, inner plates, and outer plates. Therefore, during brazing, the distance between the inner and outer plates must be maintained within 0.1mm to prevent solder leakage. Since brazing solder is watery, even a slightly larger gap between the inner and outer plates will cause solder to flow away, resulting in a weak weld and potential flue gas leakage during operation. Furthermore, during heat exchange, the inner and outer plates deform at different heating levels, potentially leading to separation and further flue gas leakage. Utility Model Content

[0003] This utility model proposes a secondary heat exchanger. The inner cavity of the outer shell has positioning protrusions. The inner plate's periphery is bent inwards to form a flange. The inner plate is installed on the inner cavity of the outer shell, with the flange positioned and supported on the positioning protrusions. The outer plate is installed on the outer side of the inner plate, pressing against it. This limits the inner plate's position between the outer plate and the positioning protrusions. The outer side of the outer shell has hooks that press against the outer plate, further tightening the inner and outer plates. Before entering the brazing furnace, the inner and outer plates can be pressed tightly together, minimizing gaps between them. During brazing, the distance between the inner and outer plates is kept within 0.1mm, preventing solder leakage. The secondary heat exchanger has good sealing properties, minimizing flue gas leakage during heat exchange.

[0004] A secondary heat exchanger designed for this purpose includes an inner plate disposed at an opening on the side of the outer shell and an outer plate pressed against the outside of the inner plate. The outer shell is provided with positioning protrusions that abut against the inner side of the inner plate, and the outer shell is provided with hooks pressed against the outer plate, so that the outer plate and the inner plate are pressed and positioned on the outer shell.

[0005] The inner plate has a flange on its edge that faces the inside of the outer shell. The flange is embedded inside the outer shell and abuts against the positioning protrusion.

[0006] The outer shell is provided with positioning protrusions on all four sides corresponding to the inner plate.

[0007] The outer panel has no bent edges and is provided with a water-permeable protrusion.

[0008] After the inner plate and outer plate are sequentially mounted on the outer shell, the portion of the outer shell that is higher than the outer plate is bent inward to form a hook edge pressed onto the outer plate.

[0009] The outer shell edge is tightly connected to the outer panel by welding.

[0010] The outer shell is provided with an inner cavity for installing the inner plate, and the outer shell is also provided with a smoke inlet pipe and an air inlet for connecting the smoke inlet pipe. The smoke inlet pipe is connected to the inner cavity of the outer shell through the air inlet.

[0011] The outer casing is provided with an exhaust pipe and an exhaust port for connecting the exhaust pipe, and the exhaust pipe is connected to the inner cavity of the outer casing through the exhaust port.

[0012] The outer casing is provided with a condensate drain pipe and a drain outlet for connecting the condensate drain pipe. The condensate drain pipe is connected to the inner cavity of the outer casing through the drain outlet.

[0013] Both sides of the outer shell are provided with inner plates, and each inner plate is provided with a water pipe and an assembly hole for connecting the water pipe; one end of the water pipe is connected to the assembly hole of one of the inner plates, and the other end of the water pipe is connected to the assembly hole of the other inner plate.

[0014] The inner plates on both sides of the outer shell are provided with outer plates. One of the outer plates is provided with a first protrusion and a second protrusion. The second protrusion is provided with a first water connector and a second water connector for connecting a water pipe. The other outer plate is provided with a third protrusion and a fourth protrusion arranged adjacent to each other.

[0015] The first, second, third, and fourth convex bulges are all provided to protrude along the outer side of the outer plate, and each convex bulge has a water-permeable cavity forming a water-permeable convex bulge on its inner side.

[0016] The outer shell is provided with an exhaust pipe, and a bracket is provided inside the exhaust pipe. The bracket is provided with a vent that connects to the inner cavity of the outer shell. The bracket is provided with rotating blades, which open and close the vent of the bracket by rotating.

[0017] The beneficial technical effects of this utility model are as follows:

[0018] The inner cavity of the outer shell is provided with positioning protrusions. The inner plate is bent inwards to form a flange. The inner plate is installed on the inner cavity of the outer shell, and the flange is positioned and supported on the positioning protrusions. The outer plate is installed on the outer side of the inner plate and presses against the inner plate. In this way, the inner plate is limited between the outer plate and the positioning protrusions. The outer side of the outer shell is provided with a hook edge to press against the outer plate, thereby pressing the inner plate and the outer plate tightly. In this way, the inner plate and the outer plate can be pressed tightly before entering the brazing furnace, minimizing the gap between the inner plate and the outer plate. During the brazing process, the distance between the inner plate and the outer plate is kept within 0.1mm, so that the solder will not flow away. The secondary heat exchanger has good sealing performance and can minimize the leakage of flue gas during the heat exchange process.

[0019] The outer shell has hooks on the outside to press the inner and outer panels together, and the gap between the hooks and the outer panel is sealed by brazing, so that even if the inner and outer panels are deformed by heat, the inner and outer panels will not easily separate. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 This is a three-dimensional structural diagram of a secondary heat exchanger according to an embodiment of the present invention.

[0022] Figure 2 This is a three-dimensional structural diagram of a secondary heat exchanger according to another embodiment of the present invention.

[0023] Figure 3 This is an exploded view of the assembly structure of the outer plate, inner plate and outer shell of a secondary heat exchanger according to an embodiment of the present invention.

[0024] Figure 4 This is an exploded view of the outer plate, inner plate and outer shell assembly of a secondary heat exchanger in another position according to an embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram showing the assembly and disassembly structure of a secondary heat exchanger according to an embodiment of the present invention.

[0026] Figure 6 This is an exploded view of the secondary heat exchanger assembly in another orientation according to an embodiment of the present invention.

[0027] Figure 7 This is a three-dimensional structural diagram of the outer shell of a secondary heat exchanger according to an embodiment of the present invention.

[0028] Figure 8 This is a three-dimensional cross-sectional structural diagram of a secondary heat exchanger according to an embodiment of the present invention.

[0029] Figure 9 for Figure 8 Enlarged view of point A in the middle.

[0030] Figure 10 This is a three-dimensional cross-sectional structural diagram of a secondary heat exchanger according to an embodiment of the present invention. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. In order to make the above-mentioned objects, features and advantages of the present application more apparent and understandable, many specific details are set forth in the following description in order to provide a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0032] See Figures 1-10 A secondary heat exchanger includes an inner plate 3 disposed at an opening on the side of a housing 1 and an outer plate 2 pressed against the outside of the inner plate 3. The housing 1 is provided with positioning protrusions 5 that abut against the inner side of the inner plate 3, and the housing 1 is provided with hook edges 6 pressed against the outer plate 2, so that the outer plate 2 and the inner plate 3 are pressed and positioned on the housing 1.

[0033] The inner plate 3 has a flange 19 on its edge facing the inside of the outer shell. The flange 19 is embedded inside the outer shell 1 and abuts against the positioning protrusion 5.

[0034] The outer shell 1 is provided with positioning protrusions 5 on all four sides corresponding to the inner plate 3.

[0035] The outer plate 2 has no bent edges and is provided with a water-permeable protrusion 25.

[0036] After the inner plate 3 and the outer plate 2 are sequentially arranged on the outer shell 1, the portion of the outer shell 1 that is higher than the outer plate 2 is bent inward to form a hook edge 6 pressed onto the outer plate 2.

[0037] The outer shell 1 with its hook edge 6 is tightly connected to the outer panel 2 by welding.

[0038] The inner plate 3 has its edges bent inwards to form flanges 19, while the outer plate 2 remains unbent. The outer shell 1 has hooked edges 6, and the inner cavity of the outer shell 1 also has positioning protrusions 5, which are recessed from the outer side of the outer shell 1 to the inner side. The positioning protrusions 5 support and hold the inner plate 3 in place. The outer plate 2 is a flat plate with protrusions that presses down on the inner plate 3. The outer plate 2 does not have any curved edges, which can cooperate with the hooked edges 6 of the outer shell 1. The rolling machine rolls the raised edges of the outer shell 1 inwards, thus forming the hooked edges 6 that press down on the inner plate 3 and the outer plate 2. In this way, before entering the brazing furnace, the inner plate 3 and the outer plate 2 can be pressed very tightly, minimizing the gap between them.

[0039] The inner plate 3 has a flange 19 positioned on the positioning protrusion 5 on its outer periphery. The flange 19 extends toward the bottom of the inner plate 3. The inner cavity 4 has a number of positioning protrusions 5 spaced apart on its inner periphery. The positioning protrusions 5 protrude from the inner wall of the inner cavity 4.

[0040] A sealing layer is provided between the hook edge 6 of the outer shell 1 and the outer plate 2 to seal the connection gap between the hook edge 6 of the outer shell 1 and the outer plate 2. The sealing layer is a welded sealing layer. After the hook edge 6 of the outer shell 1 and the outer plate 2 are sealed, the leakage of flue gas during the heat exchange process of the secondary heat exchanger is prevented.

[0041] The outer shell 1 is provided with an inner cavity 4 for installing the inner plate 3. The outer shell 1 is also provided with a smoke inlet pipe 7 and an air inlet 8 for connecting the smoke inlet pipe 7. The smoke inlet pipe 7 is connected to the inner cavity 4 of the outer shell 1 through the air inlet 8.

[0042] The outer casing 1 is provided with an exhaust pipe 9 and an exhaust port 10 for connecting the exhaust pipe 9. The exhaust pipe 9 is connected to the inner cavity 4 of the outer casing 1 through the exhaust port 10.

[0043] The outer casing 1 is provided with a condensate drain pipe 23 and a drain outlet 24 for connecting the condensate drain pipe 23. The condensate drain pipe 23 is connected to the inner cavity 4 of the outer casing 1 through the drain outlet 24. High-temperature flue gas will produce condensate when it encounters cold air, so the drain outlet 24 can drain the condensate and prevent water accumulation in the inner cavity 4 of the outer casing 1.

[0044] In this embodiment, the smoke inlet pipe 7 and the air inlet 8 can be fixedly connected by welding, the exhaust pipe 9 and the exhaust port 10 can be fixedly connected by welding, and the condensate drain pipe 23 and the drain port 24 can be fixedly connected by welding.

[0045] The outer shell 1 has inner plates 3 on both sides. Each inner plate 3 has a water pipe 11 and an assembly hole 12 for connecting the water pipe 11. One end of the water pipe 11 is connected to the assembly hole 12 of one inner plate 3, and the other end of the water pipe 11 is connected to the assembly hole 12 of the other inner plate 3.

[0046] In this embodiment, the end of the water pipe 11 is inserted into the assembly hole 12.

[0047] The number of water pipes 11 and assembly holes 12 is several, and they are arranged in a rectangular array on the inner plate 3.

[0048] In this embodiment, the water pipe 11 is a straight pipe, with one water inlet and the other water outlet. The outer plate 2 without any protrusions is a flat plate that abuts against one end of the sealing water pipe 11. This controls the direction of water flow, allowing water to enter multiple water pipes 11 through the inlet and then flow to the outlet, effectively extending the water flow path, increasing the heat exchange time, and effectively replacing the formation of spiral pipes.

[0049] The inner plates 3 on both sides of the outer shell 1 are provided with outer plates 2. One outer plate 2 is provided with a first protrusion 13 and a second protrusion 14. The second protrusion 14 is provided with a first water connector 15 and a second water connector 16 for connecting the water pipe 11. The other outer plate 2 is provided with a third protrusion 17 and a fourth protrusion 18 arranged adjacent to each other.

[0050] The first convex 13, the second convex 14, the third convex 17, and the fourth convex 18 are all provided to protrude along the outer side of the outer plate 2, and each convex 13 is provided with a water-passing cavity 20 forming a water-passing convex 25 on its inner side.

[0051] The outer shell 1 is provided with an exhaust pipe 9, and a bracket 21 is provided inside the exhaust pipe 9. The bracket 21 is provided with a vent that connects to the inner cavity 4 of the outer shell 1. The bracket 21 is provided with a rotating blade 22, which opens and closes the vent of the bracket 21 by rotating.

[0052] In this embodiment, the first convex 13 and the second convex 14 are arranged vertically or horizontally on the outer plate 2; the first convex 13 and the second convex 14 are arranged horizontally or vertically on one of the outer plates 2; the third convex 17 and the fourth convex 18 are arranged horizontally or vertically on the other outer plate 2.

[0053] In this embodiment, a support block is positioned on the bracket 21. When the blade 22 closes the vent of the bracket 21, the blade 22 is supported on the support block. When the secondary heat exchanger discharges gas, the gas pushes open the blade 22, causing the blade 22 to rotate and the exhaust port of the bracket 21 to open. Figure 10 As shown.

[0054] In this embodiment, the bracket 21 is provided with a rotating shaft, and the blade 22 is rotatably mounted on the bracket 21 via the rotating shaft. The blade 22 is provided with a connecting rolled edge for inserting the rotating shaft. The connecting rolled edge is rolled up, and the inner side of the connecting rolled edge forms a shaft hole for inserting the rotating shaft. The bracket 21 is provided with a through hole corresponding to the shaft hole, so that the rotating insertion through hole is aligned with the shaft hole of the blade 22.

[0055] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

[0056] In the above description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms 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.

[0057] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0058] In the foregoing description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to fixed connections using screws, rivets, or welding; detachable connections; or connections formed by metal processing (die casting, deep drawing, lathe machining, etc.) or injection molding; they can also be mechanical or electrical connections; they can be direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0059] In the above description of this application, unless otherwise expressly specified and limited, the use of terms such as "above" or "below" the second feature indicates that the first and second features are in direct contact, or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0060] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

Claims

1. A secondary heat exchanger, characterized in that: It includes an inner plate (3) provided at the side opening of the outer shell (1) and an outer plate (2) pressed on the outside of the inner plate (3). The outer shell (1) is provided with a positioning protrusion (5) that abuts against the inner side of the inner plate (3). The outer shell (1) is provided with a hook edge (6) pressed on the outer plate (2) so that the outer plate (2) and the inner plate (3) are pressed and positioned on the outer shell (1).

2. The secondary heat exchanger according to claim 1, characterized in that: The inner plate (3) has a flange (19) facing the inside of the outer shell. The flange (19) is embedded inside the outer shell (1) and abuts against the positioning protrusion (5).

3. The secondary heat exchanger according to claim 1, characterized in that: The outer shell (1) is provided with positioning protrusions (5) on all four sides corresponding to the inner plate (3).

4. The secondary heat exchanger according to claim 1, characterized in that: The outer plate (2) has no bent edges and is provided with a water-permeable protrusion (25).

5. The secondary heat exchanger according to claim 1, characterized in that: After the inner plate (3) and the outer plate (2) are sequentially arranged on the outer shell (1), the portion of the outer shell (1) that is higher than the outer plate (2) is bent inward and forms a hook edge (6) pressed onto the outer plate (2).

6. The secondary heat exchanger according to claim 1, characterized in that: The outer shell (1) is tightly connected to the outer panel (2) by welding (6).

7. The secondary heat exchanger according to claim 1, characterized in that: The outer shell (1) is provided with an inner cavity (4) for installing the inner plate (3), and the outer shell (1) is also provided with a smoke inlet pipe (7) and an air inlet (8) for connecting the smoke inlet pipe (7). The smoke inlet pipe (7) is connected to the inner cavity (4) of the outer shell (1) through the air inlet (8). The outer shell (1) is provided with an exhaust pipe (9) and an exhaust port (10) for connecting the exhaust pipe (9). The exhaust pipe (9) is connected to the inner cavity (4) of the outer shell (1) through the exhaust port (10).

8. The secondary heat exchanger according to claim 7, characterized in that: The outer shell (1) is provided with a condensate drain pipe (23) and a drain outlet (24) for connecting the condensate drain pipe (23). The condensate drain pipe (23) is connected to the inner cavity (4) of the outer shell (1) through the drain outlet (24).

9. The secondary heat exchanger according to claim 1, characterized in that: The outer shell (1) has inner plates (3) on both sides. Each inner plate (3) has a water pipe (11) and an assembly hole (12) for connecting the water pipe (11). One end of the water pipe (11) is connected to the assembly hole (12) of one inner plate (3), and the other end of the water pipe (11) is connected to the assembly hole (12) of the other inner plate (3).

10. The secondary heat exchanger according to claim 9, characterized in that: The inner plates (3) on both sides of the outer shell (1) are provided with outer plates (2). One of the outer plates (2) is provided with a first protrusion (13) and a second protrusion (14). The second protrusion (14) is provided with a first water connector (15) and a second water connector (16) for connecting the water pipe (11). The other outer plate (2) is provided with a third protrusion (17) and a fourth protrusion (18) arranged adjacent to each other. The first convex humb (13), the second convex humb (14), the third convex humb (17), and the fourth convex humb (18) are all convex along the outer side of the outer plate (2), and each convex humb has a water-permeable cavity (20) forming a water-permeable convex humb (25) on its inner side; The outer shell (1) is provided with an exhaust pipe (9), and a bracket (21) is provided inside the exhaust pipe (9). The bracket (21) is provided with a vent that connects to the inner cavity (4) of the outer shell (1). The bracket (21) is provided with a rotating blade (22), which opens and closes the vent of the bracket (21) by rotating.

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