A spoiler and condensing heat exchanger

Abstract

The application belongs to the technical field of condensing heat exchangers, and particularly relates to a spoiler and a condensing heat exchanger. The spoiler of the application is provided with a water blocking surface arranged in an array along the inclined direction on the smoke exhaust surface, can form accurate shielding for the smoke gas through hole between the smoke inlet surface and the smoke exhaust surface, and effectively prevents the condensate water from dropping into the hole. Meanwhile, by arraying a plurality of smoke gas through holes at the corresponding positions, the uniform distribution of the smoke gas can be promoted, and the limitation of the concentrated wall-attached flow of the smoke gas in the traditional structure is broken. The design is beneficial to guiding the smoke gas to fully diffuse into the heat exchange cavity, enlarging the covered water supply and return pipeline area, reducing the local low-speed area and flow dead angle, and thus significantly improving the uniformity of heat exchange and the latent heat recovery efficiency.

Description

Technical Field

[0001] This application belongs to the field of condensing heat exchanger technology, specifically relating to a baffle plate that promotes the diffusion and distribution of flue gas inside a condensing heat exchanger to improve the heat exchange effect. Background Technology

[0002] A condensing heat exchanger is a heat exchange device that improves thermal efficiency by recovering the latent heat released by the condensation of water vapor in flue gas. It is widely used in gas water heaters. It is typically used as a secondary heat exchange unit added to the existing main heat exchanger. Its core structure includes a heat exchange chamber connected to the main heat exchanger. This chamber contains supply and return water pipes for primary heat exchange, and is equipped with a flue gas outlet and a condensate outlet. During operation, the high-temperature flue gas generated by the main heat exchanger enters the heat exchange chamber and undergoes heat exchange as it flows over the outer surface of the supply and return water pipes, heating the water flow inside the pipes. Simultaneously, the water vapor in the flue gas condenses into liquid water on the pipe surface due to cooling, dripping to the bottom of the heat exchange chamber and flowing out through the condensate outlet. The cooled flue gas is then discharged from the flue gas outlet, thus achieving effective recovery and utilization of latent heat.

[0003] To improve the utilization efficiency of latent heat within condensing heat exchangers, existing technologies largely focus on the design of flue gas guide plates within the heat exchange chamber. Patent application number 202422611531.6 discloses a guide plate: starting from the flue gas inlet side, it extends upwards around the supply and return water pipes and then downwards, with a pre-reserved flue gas flow gap between its end and the bottom of the heat exchange chamber. This design prevents high-temperature flue gas from flowing directly to the exhaust port after entering the heat exchange chamber, forcing it to flow meanderingly along the curved surface of the guide plate. This continuously heats the supply and return water pipes in the adjacent area, effectively extending the contact time between the flue gas and the supply and return water pipes and improving the heat exchange effect. Similarly, patent application number 202510548783.5 constructs a C-shaped flue gas flow channel within the heat exchange chamber through the coordinated arrangement of three guide plates. This allows the flue gas to flow sequentially through multiple heat exchange channels before exhaust, further extending the travel distance and residence time, and improving the latent heat recovery efficiency. In fact, the design of the guide plates in most current condensing heat exchangers is essentially to create a tortuous flue gas path inside the heat exchange chamber by using the guide plates, so as to extend the flue gas residence time, improve the utilization rate of the heat exchange area, and thus enhance the overall heat recovery capacity.

[0004] However, driven by a fan, the flue gas tends to flow along the guide vanes and adhere to the wall, creating a low-speed zone or dead zone at the bottom of the heat exchange chamber, resulting in insufficient local heat exchange. In particular, to prevent condensate from flowing back to the main heat exchanger through the flue gas inlet and interfering with its normal operation, the aforementioned patents generally use small-sized flue gas inlets. This directly reduces the flue gas flow area, significantly increases the flow velocity of the flue gas near the inlet, and exacerbates the wall-adhering flow phenomenon, thus often making it difficult to achieve the expected heat exchange effect. Utility Model Content

[0005] The purpose of this application is to provide a method that can effectively promote the diffusion and distribution of flue gas inside a condenser heat exchanger.

[0006] The spoiler is achieved through the following technical solutions:

[0007] A spoiler includes a smoke-facing surface and a smoke-exhausting surface; a plurality of smoke vents are provided between the smoke-facing surface and the smoke-exhausting surface to allow smoke to flow from the smoke-facing surface to the smoke-exhausting surface; the surface of the smoke-exhausting surface is provided with a water-blocking surface to shield the smoke vents and prevent condensate from dripping into the smoke vents; the water-blocking surfaces are arranged in an array along the inclined direction of the smoke-exhausting surface, and the smoke outlets of the smoke vents are correspondingly distributed on the side near the lower end of the smoke-exhausting surface.

[0008] Preferably, the water-blocking surface includes a first water-blocking surface distributed above the flue gas inlet, and a second water-blocking surface extending downward from the first water-blocking surface to connect with the smoke exhaust surface, wherein the first water-blocking surface and the second water-blocking surface enclose the smoke outlet.

[0009] Preferably, the exhaust surface is further provided with a guide portion for causing water to flow downward along its surface to the end, the guide portion being distributed between adjacent water-blocking surfaces.

[0010] Preferably, the spoiler further includes a barrier surface for blocking the flow of smoke, the smoke exhaust surface being disposed on both sides of the barrier surface, and the smoke exhaust surface being inclined downward from the barrier surface.

[0011] Preferably, the barrier surface has an upwardly convex arc-shaped structure.

[0012] A condensing heat exchanger includes a heat exchange chamber connected to a flue gas inlet and a flue gas outlet to form a flue gas flow channel; the heat exchange chamber contains supply and return water pipes and a condensate treatment assembly for collecting and discharging condensate dripping from the surface of the supply and return water pipes; the condensing heat exchanger further includes a baffle plate as described in any of the above claims, the baffle plate being distributed between the flue gas inlet and the supply and return water pipes.

[0013] Preferably, the condensate treatment assembly includes a water receiving plate for enclosing the heat exchange cavity, with the flue gas inlet formed in the middle of the water receiving plate.

[0014] Preferably, the water receiving plate further includes water-carrying wings that are mirror-distributed on both sides of the smoke inlet.

[0015] Preferably, the two ends of the spoiler are distributed above the water-carrying wing section.

[0016] Preferably, the lower end of the first water-blocking surface located near the barrier surface is distributed above the water-carrying wing.

[0017] Compared with the prior art, this application has the following beneficial effects:

[0018] The baffle plate in this application features water-blocking surfaces arranged in an array along an inclined direction on the exhaust surface. This precisely blocks the flue gas perforations between the smoke-facing and exhaust surfaces, effectively preventing condensate from dripping into the perforations. Simultaneously, by arraying multiple flue gas perforations at corresponding positions, it promotes uniform flue gas distribution, overcoming the limitations of concentrated, wall-hugging flow in traditional structures. This design facilitates the full diffusion of flue gas into the heat exchange chamber, expanding its coverage area of ​​the supply and return water pipes, reducing localized low-velocity zones and dead zones, thereby significantly improving heat exchange uniformity and latent heat recovery efficiency.

[0019] This application utilizes a first water-blocking surface positioned above the flue gas perforations to prevent condensate flowing down from above from directly entering the perforations. Furthermore, a second water-blocking surface extending downwards from the first surface and connecting to the exhaust surface effectively prevents condensate from flowing along the inclined baffles and entering the flue gas perforations. This structure effectively prevents obstruction of flue gas flow due to water accumulation, ensuring uniform distribution and smooth diffusion of flue gas between the perforations. It avoids uneven flow and reduced heat exchange efficiency caused by localized blockages, further enhancing the system's stability and heat exchange performance.

[0020] This application utilizes the inclined angle of the flue gas exhaust surface by incorporating a guide section between adjacent water-retaining surfaces to form an orderly drainage channel. This guide section directs condensate rapidly downwards along the exhaust surface and discharges it, effectively preventing moisture retention or accumulation on the surface. This design not only improves drainage efficiency but also significantly reduces the risk of condensate clogging the flue gas vents, ensuring unobstructed and uniform flue gas flow, thereby maintaining good heat exchange performance and system operational stability.

[0021] This application incorporates a baffle surface to impede flue gas flow, with symmetrical exhaust surfaces on both sides of the baffle surface, ensuring the overall structure of the baffle plate matches the water receiving plate of the condensing heat exchanger. In this design, the baffle surface effectively prevents condensate from dripping directly onto the flue gas inlet, thus avoiding impact on the operation of the main heat exchanger. Simultaneously, the exhaust surfaces on both sides not only expand the effective area for flue gas flow but also further promote uniform flue gas diffusion through flue gas perforations and water-blocking structures. Compared to single-sided exhaust, the double-sided exhaust design significantly improves the coverage and throughput of flue gas distribution, strengthens airflow organization within the heat exchange chamber, and allows for more complete contact between the flue gas and the supply and return water pipes, thereby improving heat exchange efficiency and latent heat recovery capacity. Furthermore, the upward-protruding baffle surface effectively prevents condensate from accumulating on it.

[0022] The condensing heat exchanger of this application, by placing a baffle plate between the flue gas inlet and the supply and return water pipes, effectively disperses and guides the flue gas from the inlet into multiple areas of the heat exchange chamber through the array of flue gas perforations on the baffle plate. This significantly improves the coverage and uniformity of flue gas distribution on the surface of the supply and return water pipes. This structure breaks the traditional concentrated flow pattern of flue gas, reduces local low-velocity zones and dead zones, and enhances the heat transfer effect. Simultaneously, the design of the water-blocking surface, guide section, and arc-shaped barrier surface on the baffle plate not only effectively prevents condensate backflow or dripping into the flue gas inlet but also promotes the orderly discharge of condensate, ensuring unobstructed flue gas passages. Therefore, the heat exchange area is fully utilized, heat exchange is more uniform and efficient, the recovery efficiency of sensible and latent heat is significantly improved, and the overall heat exchange performance and operational stability are significantly enhanced.

[0023] The condensing heat exchanger of this application integrates a water receiving plate as a component of the heat exchange chamber, with a flue gas inlet in its center, achieving a unified layout of flue gas passage and drainage function. This not only results in a compact structure but also improves space utilization efficiency. Water-carrying wings are mirror-shaped on both sides of the water receiving plate, effectively collecting condensate dripping from the supply and return water pipes and the surface of the baffle plate. The condensate is guided to flow orderly along the inclined surface towards the drain end, preventing splashing or water from the flue gas inlet into the main heat exchange chamber of the water heater below. Furthermore, by positioning the lower end of the first baffle plate near the barrier surface above the water-carrying wings, vertical dripping of condensate from the flue gas vents is directly prevented, eliminating the possibility of water directly dripping into the main heat exchanger. This ensures stable heat exchange performance of the main heat exchanger and improves system safety and long-term operational reliability. Attached Figure Description

[0024] The attached diagram will be briefly described below:

[0025] Figure 1 This is a schematic diagram of the spoiler structure;

[0026] Figure 2 This is a side sectional view of the spoiler;

[0027] Figure 3 This is a schematic diagram of the water receiving plate structure;

[0028] Figure 4 This is a side sectional view of a condensing heat exchanger;

[0029] Figure 5 This is an exploded view of a condenser heat exchanger.

[0030] Reference numerals: 1000, smoke-facing surface; 2000, smoke-exhaust surface; 2100, guide section; 3000, flue gas vent; 3100, smoke outlet; 4000, water-blocking surface; 4100, first water-blocking surface; 4200, second water-blocking surface; 5000, barrier surface; 6000, heat exchange chamber; 6100, smoke inlet; 6200, smoke outlet; 6300, supply and return water pipes; 6400, condensate treatment assembly; 6500, water receiving plate; 6510, water-carrying fin. Detailed Implementation

[0031] The present application will now be further described by way of specific embodiments. Those skilled in the art will be able to implement the present application based on these descriptions. Furthermore, the embodiments of the present application described below are generally only a part of the embodiments of the present application, and not all of the embodiments. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present application without inventive effort should fall within the scope of protection of the present application.

[0032] Example 1

[0033] This embodiment discloses a baffle plate applied to a condensing heat exchanger. The baffle plate is an integral structure adapted to the internal space of the heat exchange cavity, mainly including a smoke-facing surface 1000, a smoke-exhausting surface 2000, and a barrier surface 5000. The barrier surface 5000 has an upwardly convex arc-shaped structure and serves as the central core support structure of the baffle plate. The smoke-exhausting surfaces 2000 are symmetrically arranged on both sides of the barrier surface 5000, and each smoke-exhausting surface 2000 is set at an angle downwards from the barrier surface 5000. The smoke-facing surface 1000 is arranged opposite to the smoke-exhausting surface 2000, together forming the main body of the baffle plate.

[0034] Between the smoke-facing surface 1000 and the smoke-exhausting surface 2000, several through-holes 3000 are evenly opened. The smoke-exhausting holes 3000 are arranged in multiple rows along the inclined direction of the smoke-exhausting surface 2000, so that the smoke can flow smoothly from the smoke-facing surface 1000 to the smoke-exhausting surface 2000. In order to prevent condensate from dripping into the smoke-exhausting holes 3000 and causing blockage or affecting the flow of smoke, a water-blocking surface 4000 is provided on the surface of the smoke-exhausting surface 2000 corresponding to each smoke-exhausting hole 3000. The water-blocking surface 4000 corresponds to each smoke-exhausting hole 3000, and the whole is arranged in an array along the inclined direction of the smoke-exhausting surface 2000. The smoke outlet 3100 of the smoke-exhausting hole 3000 is opened on the side closer to the inclined direction of the smoke-exhausting surface 2000.

[0035] Specifically, each water-blocking surface 4000 is composed of a first water-blocking surface 4100 and a second water-blocking surface 4200. The first water-blocking surface 4100 is positioned above the corresponding flue gas inlet 3000, and the second water-blocking surface 4200 extends vertically downward from the outer end of the first water-blocking surface 4100 until it is seamlessly connected to the surface of the exhaust surface 2000. The first water-blocking surface 4100 and the second water-blocking surface 4200 together form an open exhaust port 3100, through which the flue gas flowing out of the flue gas inlet 3000 can be smoothly discharged to the outside of the exhaust surface 2000. At the same time, the first water-blocking surface 4100 can effectively block the condensate dripping from above, preventing it from entering the flue gas inlet 3000.

[0036] In addition, on the surface of the exhaust surface 2000, in the area between two adjacent water-blocking surfaces 4000, a guide section 2100 is provided; this design can cause the condensate adhering to the surface of the exhaust surface 2000 to flow quickly downward along the guide section 2100 to the end of the baffle, thereby achieving orderly guidance of the condensate.

[0037] Example 2

[0038] This embodiment discloses a highly efficient condensing heat exchanger for recovering heat from flue gas. The main body of the heat exchanger forms a closed heat exchange chamber 6000. One end of the heat exchange chamber 6000 is connected to the flue gas inlet 6100, and the other end is connected to the flue gas outlet 6200. The flue gas inlet 6100 and the flue gas outlet 6200 are coaxially arranged, forming the core flow channel for flue gas within the heat exchange chamber 6000. Inside the heat exchange chamber 6000, baffles and supply and return water pipes 6300 are arranged sequentially along the flue gas flow direction. The baffles are precisely positioned between the flue gas inlet 6100 and the supply and return water pipes 6300 to equalize and guide the flue gas entering the heat exchange chamber 6000. The supply and return water pipes 6300 are distributed in multiple sets of serpentine coil structures, which can fully contact the flue gas to achieve heat exchange.

[0039] The heat exchange chamber 6000 is formed by the water receiving plate 6500 in the condensate treatment assembly 6400. The water receiving plate 6500 is a one-piece stamped structure with a flue gas inlet 6100 in the middle, through which flue gas can directly enter the heat exchange chamber 6000. The water receiving plate 6500 also extends integrally to form water-carrying wings 6510 mirrored on both sides of the flue gas inlet 6100. The water-carrying wings 6510 have a downwardly inclined groove-shaped structure, serving as a temporary bearing and guiding area for condensate.

[0040] The spoiler in this application adopts the spoiler of Embodiment 1. Since the arc-shaped barrier surface 5000 is the central support, the exhaust surfaces 2000 on both sides of it extend downward at an angle. The two ends of the spoiler are just mounted above the water-carrying wings 6510 on both sides of the smoke inlet 6100. Furthermore, the lower end of the first water-blocking surface 4100 set near the barrier surface 5000 is precisely aligned with the top of the water-carrying wings 6510, ensuring that condensate can drip precisely into the water-carrying wings 6510.

[0041] The working process of this condensing heat exchanger is as follows: High-temperature flue gas enters the heat exchange chamber 6000 through the inlet 6100, first flowing through the baffle plate. The flue gas is evenly distributed through the flue gas perforations 3000 on the baffle plate, and then flows towards the supply and return water pipes 6300, fully contacting them to complete heat exchange. During the heat exchange process, condensate generated on the surface of the supply and return water pipes 6300 drips onto the exhaust surface 2000 and the water-blocking surface 4000 of the baffle plate. Under the guidance of the guide section 2100 of the exhaust surface 2000, the flue gas flows along the inclined direction of the exhaust surface 2000 to the lower end of the exhaust surface 2000, and finally drips into the water-carrying wing 6510 of the water receiving plate 6500. The condensate collected by the water-carrying wing 6510 is collected by the drainage structure of the condensate treatment component 6400 and discharged from the heat exchange chamber 6000, completing the closed-loop treatment of the condensate. The flue gas after heat exchange and cooling continues to flow to the exhaust port 6200 and is finally discharged from the heat exchange chamber 6000.

Claims

1. A spoiler, the spoiler comprising a smoke-facing surface (1000) and a smoke-exhausting surface (2000); a plurality of smoke vents (3000) are provided between the smoke-facing surface (1000) and the smoke-exhausting surface (2000) to allow smoke to flow from one side of the smoke-facing surface (1000) to the other side of the smoke-exhausting surface (2000); characterized in that, The surface of the exhaust surface (2000) is provided with a water-blocking surface (4000) for shielding the flue gas vent (3000) to prevent condensate from dripping into the flue gas vent (3000); the water-blocking surface (4000) is arranged in an array along the inclined direction of the exhaust surface (2000), and the smoke outlet (3100) of the flue gas vent (3000) is correspondingly distributed on the side near the lower end of the exhaust surface (2000).

2. A spoiler according to claim 1, characterized in that, The water-blocking surface (4000) includes a first water-blocking surface (4100) distributed above the flue gas vent (3000) and a second water-blocking surface (4200) extending downward from the first water-blocking surface (4100) to connect with the smoke exhaust surface (2000). The first water-blocking surface (4100) and the second water-blocking surface (4200) together form the smoke outlet (3100).

3. A spoiler according to claim 1, characterized in that, The exhaust surface (2000) is also provided with a guide section (2100) for causing water to flow down its surface to the end, the guide section (2100) being distributed between adjacent water-blocking surfaces (4000).

4. A spoiler according to claim 1, characterized in that, The spoiler also includes a barrier surface (5000) for blocking the flow of smoke, and the smoke exhaust surface (2000) is disposed on both sides of the barrier surface (5000), and the smoke exhaust surface (2000) is inclined downward from the barrier surface (5000).

5. A spoiler according to claim 4, characterized in that, The barrier surface (5000) has an upwardly convex arc-shaped structure.

6. A condensing heat exchanger, comprising a heat exchange chamber (6000) connected to a flue gas inlet (6100) and a flue gas outlet (6200) to form a flue gas flow channel; wherein supply and return water pipes (6300) are distributed inside the heat exchange chamber (6000), and a condensate treatment assembly (6400) for collecting and discharging condensate dripping from the surface of the supply and return water pipes (6300); characterized in that, The condensing heat exchanger further includes a baffle plate as described in any one of claims 1 to 5, the baffle plate being distributed between the flue gas inlet (6100) and the supply and return water pipeline (6300).

7. A condensing heat exchanger according to claim 6, characterized in that, The condensate treatment assembly includes a water receiving plate (6500) for enclosing the heat exchange chamber (6000), and the flue gas inlet (6100) is formed in the middle of the water receiving plate (6500).

8. A condensing heat exchanger according to claim 7, characterized in that, The water receiving plate (6500) also includes water-carrying wings (6510) that are mirror-distributed on both sides of the flue gas inlet (6100).

9. A condensing heat exchanger according to claim 8, characterized in that, The two ends of the spoiler are distributed above the water-carrying wing (6510).

10. A condensing heat exchanger according to claim 9, characterized in that, The lower end of the first water-blocking surface (4100) located near the barrier surface (5000) is distributed above the water-carrying wing (6510).

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