Combustion heat exchange assembly and gas water heater

Abstract

The utility model relates to the technical field of household appliances, in particular to a combustion heat exchange assembly and a gas water heater, and the combustion heat exchange assembly comprises a combustor used for forming flames and provided with a combustion port for spraying the flames outwards; the heat exchanger is arranged above the combustor and comprises a heat exchange shell, a heat exchange pipeline and heat exchange fins, a heat exchange channel is arranged in the heat exchange shell, the heat exchange pipeline is provided with a heat exchange part arranged in the heat exchange channel, and the heat exchange fins are arranged in the heat exchange channel and attached to the heat exchange part; the smoke guide shell is internally provided with a smoke guide channel which is communicated with the combustion opening and upwards discharges smoke generated by combustion into the heat exchange channel, and a lower end opening of the smoke guide channel is connected with the combustion opening so that a combustion area for flame combustion can be formed in the smoke guide channel. A heat resisting structure is formed in the side wall of the smoke guiding channel. According to the combustion heat exchange assembly, heat can be prevented from being dissipated outwards through a simple structure, and the combustion heat exchange assembly is higher in economical efficiency.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, and more specifically to combustion heat exchange components and gas water heaters. Background Technology

[0002] A gas water heater is a household appliance that releases heat energy by burning gas and uses a heat exchange device to transfer the heat to the water flow to achieve rapid heating. A typical gas water heater includes several core modules: combustion heat exchange components (including combustion components that generate high-temperature flames, and heat exchangers that realize gas-water heat transfer through finned heat exchange tubes), a fan system (including components such as turbine fans), and supporting piping and electrical control components.

[0003] In existing technical solutions, to reduce the impact of the high-temperature flame generated by the combustion heat exchange components on surrounding electrical components, two heat dissipation methods are commonly used: one is to install a circulating water cooling device on the outer wall of the combustion chamber, and the other is to install an active air cooling system on the outside. However, in practical applications, it has been found that:

[0004] For water-cooled heat dissipation solutions, the water pipes need to be laid out in a multi-dimensional and three-dimensional manner with the combustion chamber, which leads to structural complexity and complicated installation procedures. In order to prevent coolant leakage and oxidation and corrosion of metal pipes, high-sealing-grade pipes and surface treatment processes must be used, which significantly increases manufacturing costs. There is a risk of scaling during long-term operation, which affects heat dissipation efficiency and increases maintenance costs.

[0005] For active air cooling systems, the need to configure independent fan components not only incurs additional equipment procurement costs, but also requires the setting of dedicated air ducts and independent control circuits, which increases the complexity of the overall assembly.

[0006] In other words, both of the above traditional heat dissipation methods suffer from technical bottlenecks such as complex structures, high production costs, and poor economic efficiency. Utility Model Content

[0007] One objective of this utility model is to address the shortcomings of existing technologies by providing a combustion heat exchange component that combines the characteristics of gas combustion to prevent heat loss through a simple structure, thus achieving higher economic efficiency. A second objective of this utility model is to provide a gas water heater incorporating the aforementioned combustion heat exchange component.

[0008] The technical solution of this utility model is as follows:

[0009] A combustion heat exchange assembly includes: a burner for forming a flame, the burner having a combustion port for the flame to be ejected outward; a heat exchanger positioned above the burner, comprising a heat exchange shell, heat exchange pipes, and heat exchange fins, the heat exchange shell having a heat exchange channel, the heat exchange pipes having a heat exchange portion disposed within the heat exchange channel, and the heat exchange fins disposed within the heat exchange channel and abutting against the heat exchange portion; a smoke guide shell having: a smoke guide channel communicating with the combustion port and discharging the flue gas generated during combustion upward into the heat exchange channel, the lower end opening of the smoke guide channel being connected to the combustion port, so that a combustion zone for flame combustion is formed in the smoke guide channel; a heat-insulating structure formed in the sidewall of the smoke guide channel, the heat-insulating structure including: a heat-insulating cavity disposed in the sidewall of the smoke guide channel; an outlet channel communicating between the heat-insulating cavity and the smoke guide channel; and an inlet channel communicating with the upper region of the heat-insulating cavity and communicating between the heat-insulating cavity and external air.

[0010] In some designs, the vent is connected to the lower region of the heat-insulating cavity.

[0011] In some designs, the end of the exhaust duct furthest from the heat-insulating cavity is aligned with the combustion zone so that the airflow output from the exhaust duct can be delivered to the combustion zone of the smoke guide channel.

[0012] In some embodiments, the heat exchange fins include a fin body having at least two insertion holes spaced laterally; the heat exchange pipes extend in a curved manner and pass through the two insertion holes in sequence; one side of the fin body has a raised smoke-blocking structure, which is located in the middle region of the two insertion holes and drives the flue gas flowing from bottom to top to flow towards the insertion holes on both sides.

[0013] In some designs, the smoke-blocking structure includes a first smoke-blocking section, a second smoke-blocking section, and a third smoke-blocking section arranged sequentially from bottom to top; the width of the first smoke-blocking section, the second smoke-blocking section, and the third smoke-blocking section gradually increases from bottom to top.

[0014] In some designs, the first smoke-blocking part is configured vertically as being below the center of the two insertion holes.

[0015] In some designs, the third smoke-blocking part is configured vertically as being higher than the two insertion holes, and the lower end face of the third smoke-blocking part is a downwardly convex arc-shaped surface.

[0016] In some embodiments, the second smoke-blocking part includes: a first guide plate extending at an angle, configured to guide the flue gas flowing from bottom to top to the upper end of an insertion port; a second guide plate extending at an angle, configured to guide the flue gas flowing from bottom to top to the upper end of another insertion port; and the lower end of the first guide plate is close to or connected to the lower end of the second guide plate.

[0017] In some designs, the sidewall of the flue gas duct is provided with: a protruding guide portion in the flue gas duct; the interior of the guide portion is hollow and communicates with the heat-insulating cavity; and the outer wall of the guide portion includes: a guide wall facing the combustion port, which is inclined to guide the airflow flowing upward from the sidewall of the flue gas duct to the center of the flue gas duct; a backflow wall facing away from the combustion port; and a connecting wall extending vertically and connecting the guide wall and the backflow wall; and an exhaust channel is provided on the backflow wall.

[0018] In some designs, the sidewall of the smoke guide duct is provided with: a protruding guide portion in the smoke guide duct; the interior of the guide portion is hollow and communicates with the heat insulation cavity; and the outer wall of the guide portion includes: a guide wall facing the combustion port, which is inclined to guide the airflow at the sidewall of the smoke guide duct to the center of the smoke guide duct; a backflow wall facing away from the combustion port; and a connecting wall extending vertically and connecting the guide wall and the backflow wall; and an exhaust channel is provided in the connecting wall.

[0019] In some designs, the burner has a flange located on the outer periphery of the combustion port, and the lower end of the side wall of the flue gas duct abuts against the flange, so that the flange has a shielding part that shields the edge of the lower opening of the flue gas duct; the shielding part is provided with a supplementary air channel for external air to enter the flue gas duct.

[0020] A gas water heater comprising the combustion heat exchange component described in any of the above embodiments.

[0021] The main beneficial effects of the above technical solution are as follows:

[0022] 1. By setting a heat-insulating structure in the smoke guide housing located in the side wall of the smoke guide channel, which can use cold air as a heat insulation medium, the heat generated by the flame combustion in the smoke guide housing can be prevented from overflowing outward, effectively controlling the surface temperature of the combustion components.

[0023] 2. The overall heat-insulating structure is simpler, which can better reduce production costs.

[0024] 3. In addition to creating air-cooled insulation, the heat-insulating airflow can also bring the dissipated heat back into the flue gas duct for heat exchange with the heat exchanger, thereby improving the overall effective heat output rate of the combustion components and forming a high-efficiency gas combustion structure.

[0025] 4. By forming a heat-resistant structure, when the combustion components are working, more and more stable oxygen from the external space can be input into the smoke guide channel, so as to better form a uniform oxygen and stable combustion chamber in the smoke guide shell.

[0026] 5. By setting the fins accordingly to form a smoke-blocking structure, the heat exchange efficiency can be improved.

[0027] 6. Connect the air outlet to the lower region of the heat-insulating cavity to allow airflow to flow into the heat-insulating cavity from the upper region and out from the lower region. This creates a larger airflow area within the heat-insulating cavity, resulting in a larger heat-blocking area and improving the heat-blocking effect.

[0028] 7. By setting up a flow guide, on the one hand, the airflow (air, gas, and high-temperature flue gas, etc.) can be better concentrated in the center of the flue, thereby improving combustion efficiency and heat concentration rate, and thus enabling better heat accumulation and output, which facilitates better utilization of heat in the future; on the other hand, it can simultaneously drive the airflow away from the side wall of the flue, thereby further reducing the effect of heat transfer to the outside.

[0029] 8. Further, by setting the air outlet channel on the connecting wall, the airflow in the heat-insulating cavity can be better attracted, further improving the smoothness of the heat-insulating airflow, thereby improving the overall blocking effect on overflowing heat and better reducing the surface temperature of the smoke guide shell.

[0030] 9. By setting up air supply channels, the amount of air entering can be further increased, so that the gas can be burned more completely. On the other hand, combined with the above-mentioned flow guide, under the condition that the rest of the settings are the same, adding air supply channels can increase the overall air intake, thereby better improving the gas flow rate in the smoke guide channel at the connecting wall, further contributing to the formation and smooth flow of heat-resistant airflow, so as to better prevent the heat in the smoke guide channel from overflowing outward.

[0031] Further or more detailed beneficial effects will be described in conjunction with specific embodiments in the detailed implementation. Attached Figure Description

[0032] The present invention will be further described below with reference to the accompanying drawings:

[0033] Figure 1 This is a schematic diagram of the internal structure of a gas water heater.

[0034] Figure 2 A schematic diagram of the combustion assembly installation structure.

[0035] Figure 3 This is a cross-sectional schematic diagram of the combustion assembly.

[0036] Figure 4 This is a schematic diagram of a heat exchanger.

[0037] Figure 5 This is a schematic diagram of the fin structure.

[0038] Figure 6 This is a frontal view of the fins.

[0039] Figure 7 This is an enlarged schematic diagram of the air outlet and air inlet.

[0040] Figure 8 This is a schematic diagram of the airflow for heat dissipation.

[0041] Figure 9 This is a schematic diagram of an installation structure for a smoke guide shell.

[0042] Figure 10 This is a schematic diagram of the flow guide section.

[0043] Figure 11 A schematic diagram showing the setup of the air supply channel.

[0044] Figure 12 This is a schematic diagram of an installation structure for the smoke guide shell when a protrusion is formed in the heat-insulating cavity. Detailed Implementation

[0045] The present invention will be illustrated with specific examples below:

[0046] Example:

[0047] Gas water heater, as attached Figure 1 As shown, it mainly includes a water heater casing, and a combustion heat exchange assembly and a fan assembly 4 placed inside the water heater casing. The combustion heat exchange assembly includes a combustion component for forming a high-temperature flame, and a heat exchanger 3 with water pipes for transferring high temperature to cold water in the water pipes. The fan assembly 4 is used to form a directional airflow in the combustion heat exchange assembly.

[0048] Specifically, for example, attached Figure 1 As shown, as an example, the combustion assembly includes a burner 1 and a flue gas housing 2. The flue gas housing 2 can be detachably (using a detachable connection method such as screws) or non-detachably (using a non-detachable connection method such as welding or integral molding) fixedly connected to the burner 1, or it can be not connected to the burner 1, but connected to other external support structures, such as the water heater casing.

[0049] The burner 1 includes a burner housing 1.1, the upper end of which has a combustion port 1.11 for the flame to be ejected outwards. More specifically, as shown in the attached... Figure 3 As an example, the burner housing 1.1 has an upward-facing opening at its upper end, which is a combustion port 1.11; and several burners 1.2 are installed in a hollow cavity inside the burner housing 1.1, and an air intake channel 1.12 for air to flow in is formed; an ignition device 1.3 for ignition is also provided in the combustion port 1.11 (the ignition device 1.3 is a conventional ignition device used in gas water heaters and gas stoves, such as an electric spark ignition device).

[0050] A gas passage for gas to flow into is formed inside the burner 1.2. The lower end of the gas passage is connected to the gas delivery pipeline, and the upper end is connected to the combustion port 1.11 so that the gas can be delivered to the combustion port 1.11 through the burner 1.2.

[0051] The lower end of the air intake passage 1.12 is open to allow air to flow in; the upper end is connected to the combustion port 1.11 so that external air can be delivered from the air intake passage 1.12 to the combustion port 1.11.

[0052] The smoke guide housing 2 is disposed above the burner 1, and the smoke guide housing 2 has a smoke guide channel 2.1 that communicates with the combustion port 1.11 and discharges the flue gas generated by combustion upward. The smoke guide channel 2.1 can be a vertically penetrating channel disposed in the smoke guide housing 2, and the lower end of the channel is connected to the combustion port 1.11.

[0053] Meanwhile, to better prevent the heat and smoke generated during combustion from escaping, the lower opening of the smoke guide channel 2.1 is connected to the combustion port 1.11 (i.e., the port of the combustion port 1.11 is close to or sufficiently adjacent to the port of the lower opening of the smoke guide channel 2.1), so that a combustion zone for flame combustion is formed in the smoke guide channel 2.1. The diameter of the smoke guide channel 2.1 is often greater than or equal to the opening diameter of the combustion port 1.11.

[0054] During operation, gas is supplied from the gas passage inside the burner 1.2 to the combustion port 1.11, and air flows from the air intake passage 1.12 to the combustion port 1.11. The ignition device 1.3 is then activated for ignition, igniting the gas at the combustion port 1.11 of the burner 1 to form an upward-flowing combustion flame. This flame enters the smoke guide passage 2.1 for combustion, creating a combustion zone within the passage. Simultaneously, the flue gas and heat generated by combustion enter the smoke guide passage 2.1 and flow upwards under its guiding effect.

[0055] The heat exchanger 3 is placed above the flue gas housing 2 and is used to exchange heat with the high-temperature flue gas in the flue gas channel 2.1 to form hot water.

[0056] To be precise, as shown in the appendix Figure 4 As illustrated as an example, the heat exchanger 3 includes a heat exchange housing 3.1, which can be detachably connected to the flue gas housing 2, for example, by screws, or to other external support structures, such as the water heater casing. The heat exchange housing 3.1 has heat exchange channels 3.11 (as shown in the attached diagram) that are through-type at both ends. Figure 3As shown, the heat exchange channel 3.11 is a vertically through-hole; the lower end of the heat exchange channel 3.11 is connected to the upper opening of the flue gas guide channel 2.1 so that the high-temperature flue gas generated by combustion in the flue gas guide channel 2.1 can flow upward into the heat exchange channel 3.11.

[0057] Meanwhile, the heat exchanger 3 also includes a heat exchange pipe 3.2, which has a water inlet at one end and a water outlet at the other end. The heat exchange pipe 3.2 is connected to the heat exchange shell 3.1 and has a heat exchange portion placed in the heat exchange channel 3.11. Implementation: When combustion occurs as described above to form a flame and high-temperature flue gas, the high-temperature flue gas flows into the heat exchange channel 3.11 to transfer heat to the heat exchange portion of the heat exchange pipe 3.2 placed in the heat exchange channel 3.11. At the same time, cold water is supplied to the water inlet of the heat exchange pipe 3.2 through, for example, a tap water pipe. This cold water is heated after flowing through the portion of the heat exchange pipe 3.2 placed in the heat exchange channel 3.11, and then hot water is output from the outlet for use.

[0058] The heat exchange channel 3.11 may also be provided with several heat exchange fins 3.3 (the heat exchange fins 3.3 are sheet-like structures made of materials with good thermal conductivity such as steel strips, stainless steel strips, copper strips, and aluminum strips). The heat exchange fins 3.3 have a part that fits into the heat exchange pipe 3.2 to increase the heat exchange contact area with the high-temperature flue gas, so as to transfer the heat in the high-temperature flue gas to the heat exchange pipe 3.2 better and over a larger area, thereby further improving the heat exchange effect on the cold water in the heat exchange pipe 3.2.

[0059] To improve heat exchange efficiency, especially when the flow guide 2.6 is provided to concentrate the high-temperature airflow at the center of the heat exchange channel 3.11 and allow it to flow upwards, it is suitable for heat exchange with a higher-speed airflow to improve heat exchange effect and efficiency; as shown in the attached figure. Figure 5 As shown, the heat exchange fin 3.3 in this embodiment includes a fin body 3.31, which is provided with insertion holes 3.32 for inserting heat exchange pipes 3.2. There are at least two insertion holes 3.32, which are spaced apart laterally. When the heat exchange fin 3.3 is installed in the heat exchange channel 3.11, the heat exchange pipe 3.2 extends in a curved manner and passes through several insertion holes 3.32 in sequence. The inserted part of the heat exchange pipe 3.2 is in contact with the heat exchange fin 3.3, so that the heat obtained by the heat exchange fin 3.3 through heat transfer with the high-temperature flue gas can be transferred to the heat exchange pipe 3.2 to heat the heat exchange pipe 3.2.

[0060] As attached Figure 5As shown, one side of the fin body 3.31 has a raised smoke-blocking structure. This smoke-blocking structure is located in the middle area of ​​the two insertion holes 3.32 and drives the flue gas flowing from bottom to top to flow into the insertion holes 3.32 on both sides. This achieves the following: By setting the smoke-blocking structure, not only is the contact area of ​​the heat exchange fins 3.3 for contact with the hot airflow increased, and the airflow velocity is reduced to prolong the contact time between the airflow and the heat exchange fins 3.3, thereby improving the heat exchange effect; it also drives the airflow to flow into the insertion holes 3.32 where the heat exchange pipes 3.2 are inserted, so that the hot airflow can heat the heat exchange pipes 3.2 better and faster.

[0061] Furthermore, in this embodiment, the smoke-blocking structure includes a first smoke-blocking portion 3.34, a second smoke-blocking portion 3.35, and a third smoke-blocking portion 3.36 arranged sequentially from bottom to top. And, in the bottom-to-top direction, the width dimensions of the first smoke-blocking portion 3.34, the second smoke-blocking portion 3.35, and the third smoke-blocking portion 3.36 (as shown in the attached figure)... Figure 5 In the middle, the spacing between the two ends of the smoke-blocking section in the left-right direction gradually increases. That is, as shown in the attached figure... Figure 6 As shown, the width dimension d1 of the first smoke-blocking part 3.34 is smaller than the width dimension d2 of the second smoke-blocking part 3.35, and the width dimension d2 of the second smoke-blocking part 3.35 is smaller than the width dimension d3 of the third smoke-blocking part 3.36.

[0062] At this point, the first smoke-blocking section 3.34, the second smoke-blocking section 3.35, and the third smoke-blocking section 3.36 together form an inverted triangular flow-guiding structure. When the flue gas flowing from bottom to top impacts the smoke-blocking structure, it not only slows down the flow velocity but also splits the airflow into two streams: one near the left insertion hole 3.32 and the other near the right insertion hole 3.32. This achieves the following: when a heat exchange pipe 3.2 is inserted into the insertion hole 3.32 of the heat exchange fin 3.3, it can better drive the high-temperature flue gas towards the heat exchange pipe 3.2, thereby improving the heat exchange effect.

[0063] Moreover, the smoke-blocking structure in this embodiment consists of three vertically spaced smoke-blocking sections, with sufficient space between them for airflow to avoid excessive airflow blockage. This improves heat exchange efficiency while optimizing the smoothness of airflow.

[0064] In the vertical direction (attached) Figure 5 In the vertical direction, the first smoke-blocking part 3.34 can be configured such that it is lower than the center of the two insertion holes 3.32 (the center of the insertion hole; when the insertion hole is circular, its center position is the center of the circle). That is, as shown in the attached figure. Figure 6The first smoke-blocking part 3.34 is lower than the center of both the left and right insertion holes 3.32. This achieves the following: the first smoke-blocking part 3.34 can better drive the airflow from bottom to top to the insertion holes 3.32 on both sides; and the airflow can have more space to flow smoothly upwards.

[0065] Furthermore, in the vertical direction (attached) Figure 5 In the vertical direction, the third smoke-blocking section 3.36 is configured to be higher than both the left and right insertion holes 3.32; that is, the third smoke-blocking section 3.36 is higher than both its left and right insertion holes 3.32. This allows the third smoke-blocking section 3.36 to create a greater flow-blocking effect at a higher position, better slowing the airflow in the area where the insertion holes 3.32 are located on the heat exchange fins 3.3, prolonging the time that the airflow can have thermal contact with the heat exchange fins 3.3, and improving the heat exchange effect. Furthermore, the lower end face of the third smoke-blocking section 3.36 is an arc-shaped surface that convexes downwards in the middle; this optimizes the smoothness of airflow and reduces the possibility of eddies.

[0066] Furthermore, as shown in the appendix Figure 5 As shown, the second smoke-blocking part 3.35 includes: a first guide plate 3.351 extending at an angle (e.g., attached to...). Figure 5 In the middle, it extends at an angle with the left side higher than the right side, and is configured to guide the flue gas flowing from bottom to top to the upper end of an insertion port 3.32.

[0067] The second smoke-blocking part 3.35 also includes a second guide plate 3.352 extending at an angle (e.g., attached). Figure 5 (Extending at an angle, higher on the right and lower on the left), it is configured to guide the flue gas flowing from bottom to top to the upper end of another insertion port 3.32. And the lower end of the first guide plate 3.351 is close to or connected to the lower end of the second guide plate 3.352.

[0068] In this way, the airflow can be better guided to the upper end of the insertion hole 3.32, which is not easy to come into contact with the hot airflow; especially when the heat exchange pipe 3.2 is inserted into the insertion hole 3.32, the above-mentioned second smoke blocking part 3.35 can better guide the flue gas to the black side of the heat exchange pipe 3.2 (i.e. the upper end of the heat exchange pipe 3.2 facing away from the airflow), so as to improve the heat exchange effect.

[0069] Similarly, as shown in the appendix Figure 5 As shown, one side of the fin body 3.31 may also be provided with a plurality of flow-blocking pillars 3.33 arranged around the upper half of the insertion hole 3.32. In this embodiment, the flow-blocking pillars 3.33 and the smoke-blocking structure are arranged on the same side of the fin body 3.31.

[0070] To increase the contact area with the heat exchange pipe 3.2, the wall of the insertion hole 3.32 may also extend to include a raised extension wall 3.321 on one side of the fin body 3.31.

[0071] At this point, the extension wall 3.321 and the smoke-blocking structure are preferably located on the same side of the fin body 3.31, and the protrusion height of the extension wall 3.321 is greater than the protrusion height of the smoke-blocking structure. Furthermore, the outer edge of the protruding end of the extension wall 3.321 is provided with several support ends 3.322 extending towards the outer periphery of the insertion hole 3.32. Thus, when multiple heat exchange fins 3.3 are stacked, the support ends 3.322, acting as a support structure, will protect the smoke-blocking structure, ensuring that the smoke-blocking structure can stably and smoothly change the airflow as required, as described above.

[0072] The first smoke-blocking part 3.34, the second smoke-blocking part 3.35, the third smoke-blocking part 3.36 and the flow-blocking column 3.33 are preferably formed by flanging or pressurizing the fin body 3.31 to form the above structure while avoiding excessive increase in the overall weight of the heat exchange fin 3.3.

[0073] Based on the above, as shown in the appendix Figure 5 As shown, the fin body 3.31 can also be provided with an overflow hole 3.38 located above the insertion hole 3.32 to improve the overall airflow smoothness. Furthermore, a baffle portion 3.37 protruding on one side of the fin body 3.31 can be provided above the overflow hole 3.38 to block the airflow flowing upwards from the overflow hole 3.38, better preventing excessive airflow from overflowing from the overflow hole 3.38, thereby extending the overall heat contact time between the airflow and the heat exchange fins 3.3 and improving the heat exchange effect. This baffle portion 3.37 is preferably formed by flanging the edge of the fin body 3.31.

[0074] The fan assembly 4 is a fan structure used in a gas water heater to form an airflow, and it is configured to form an airflow that drives flue gas from the flue gas channel 2.1 into the heat exchange channel 3.11.

[0075] The fan assembly 4 can be connected to the heat exchange housing 3.1, positioned at the upper opening of the heat exchange channel 3.11, and configured to draw in the flue gas from the smoke guide channel 2.1, driving the flue gas from the smoke guide channel 2.1 into the heat exchange channel 3.11. The fan assembly 4 is also equipped with a smoke exhaust duct for directional discharge of the drawn-in flue gas, which is connected to a smoke exhaust outlet in the building to directionally discharge the flue gas.

[0076] The fan assembly 4 can also be connected to the burner 1, positioned at the lower opening of the air intake passage 1.12, and configured to blow the flue gas in the smoke guide passage 2.1 upwards, thereby driving the flue gas from the smoke guide passage 2.1 into the heat exchange passage 3.11. In this case, the upper opening of the heat exchange passage 3.11 is used to connect with the exhaust port in the building.

[0077] In summary, the combustion heat exchange assembly (including the combustion component and heat exchanger 3) and the fan assembly 4 together constitute the main components of a gas water heater. In addition, the gas water heater also includes several electrical components located outside the combustion heat exchange assembly. When the combustion heat exchange assembly operates as described above, the following issues arise: the high-temperature heat inside the flue gas casing 2 easily escapes, which not only drives the surface temperature of the flue gas casing 2 to be too high, affecting its service life, but also adversely affects the electrical components outside the combustion heat exchange assembly, potentially significantly reducing the lifespan of the gas water heater in severe cases.

[0078] Therefore, a combustion heat exchange component is needed that can prevent heat leakage from the smoke guide shell 2 and better reduce the surface temperature of the smoke guide shell 2. A gas water heater equipped with this combustion heat exchange component is proposed.

[0079] As one approach, a water-cooling structure can be provided on the outer surface of the smoke guide shell 2 to solve the above problems. However, setting up a water-cooling structure often requires a complex piping structure, resulting in complex piping structures and installation difficulties for the combustion assembly; moreover, in order to better prevent water leakage and water corrosion, the water-cooled piping structure often requires a large cost.

[0080] To address the aforementioned issues while simplifying the structure and reducing costs, this application proposes a combustion heat exchange component that, by combining the characteristics of gas combustion, can effectively prevent heat loss through a simple structure, thus achieving higher economic efficiency. A gas water heater incorporating this combustion heat exchange component is also proposed.

[0081] As an example, see attached Figure 3 and attached Figure 7 As shown, the combustion heat exchange assembly in this embodiment also includes a heat-resistant structure formed in the sidewall of the smoke guide channel 2.1.

[0082] Specifically, the heat-insulating structure includes: a heat-insulating cavity 2.2, an air outlet channel 2.4, and an air inlet channel 2.3. More precisely, for example, [the structure includes...]. Figure 3 and attached Figure 7As shown, the heat-insulating cavity 2.2 is a cavity located in the side wall of the smoke guiding channel 2.1; the air outlet 2.4 is a hole located in the side wall of the heat-insulating cavity 2.2, which is laterally closer to the smoke guiding channel 2.1, and connects the heat-insulating cavity 2.2 with the smoke guiding channel 2.1; the air inlet 2.3 is a hole located in the side wall of the heat-insulating cavity 2.2, which is laterally farther from the smoke guiding channel 2.1, and connects the heat-insulating cavity 2.2 with the outside air, and the air inlet 2.3 is connected to the upper region of the heat-insulating cavity 2.2. (In the vertical direction, the heat-insulating cavity 2.2 is divided into three equal parts, from top to bottom, into an upper region, a middle region, and a lower region.)

[0083] At this time, when a flame forms in the combustion zone of the smoke guide duct 2.1, it consumes oxygen and fuel gas, and forms directly rising high-temperature flue gas, creating a low-pressure zone in the smoke guide duct 2.1. Meanwhile, external air enters the heat-insulating cavity 2.2 through the air inlet duct 2.3, flows through the heat-insulating cavity 2.2, and then flows out through the air outlet duct 2.4 back into the smoke guide duct 2.1, thus creating a flowing airflow in the heat-insulating cavity 2.2 (as shown in the attached diagram). Figure 8 (As indicated by the middle arrow) This is called the heat-insulating airflow. This heat-insulating airflow forms a wind-cooled heat insulation, which can bring the heat dissipated from the surface of the smoke guide shell 2 outward through the smoke guide channel 2.1 back into the smoke guide channel 2.1. It not only prevents the heat generated by the flame combustion in the smoke guide shell 2 from escaping outward, effectively controlling the surface temperature of the combustion component, but also brings the dissipated heat back into the smoke guide channel 2.1 for heat exchange with the heat exchanger 3, improving the overall effective heat output rate of the combustion component. At the same time, the above-mentioned heat-insulating structure does not require additional complex water pipe structures, has a simpler and easier-to-install structure, and does not require significant costs to deal with the control of the water cooling circuit and the problem of water corrosion, thus better avoiding the problems associated with water cooling.

[0084] The specific location of the air outlet 2.4 can be set according to requirements. In this embodiment, as shown in the attached figure... Figure 3 and attached Figure 7 As shown, the air outlet 2.4 is preferably connected to the lower region of the heat-insulating cavity 2.2, so that airflow can flow into the heat-insulating cavity 2.2 from the upper region and out from the lower region. This allows for the formation of a larger airflow area in the heat-insulating cavity 2.2, thereby creating a larger heat-blocking area and improving the heat-blocking effect.

[0085] Furthermore, as shown in the appendix Figure 3 and attached Figure 7As shown, the end of the air outlet 2.4 furthest from the heat-insulating cavity 2.2 can be aligned with the combustion zone so that the airflow output from the air outlet 2.4 can be delivered to the combustion zone of the smoke guide channel 2.1. In this way, the air with a certain amount of heat in the heat-insulating cavity 2.2 can participate more effectively in the combustion of the combustion assembly, thereby improving the overall combustion efficiency and combustion effect of the combustion assembly.

[0086] In the above plan, as shown in the appendix Figure 3 As shown, the air intake duct 2.3 can be located on the side wall of the heat-insulating cavity 2.2 facing away from the smoke guide channel 2.1 (i.e., the side wall of the heat-insulating cavity 2.2 is laterally away from the smoke guide channel 2.1), so as to have a more spacious area for external air to flow into the air intake duct 2.3, thereby improving the smoothness of airflow and enhancing the heat blocking effect. At this time, as shown in the attached... Figure 7 As shown, the side wall of the heat-insulating cavity 2.2 facing away from the smoke guide channel 2.1 may also be provided with a protruding flow guide 2.5 into the heat-insulating cavity 2.2. The flow guide 2.5 is inclined so as to guide the airflow entering the heat-insulating cavity 2.2 from the air inlet channel 2.3 to flow upward and then downward, so as to further increase the flow area of ​​the airflow in the heat-insulating cavity 2.2 and increase the heat blocking area.

[0087] In some designs, for the side wall of the heat-insulating cavity 2.2 located between the smoke guide channel 2.1 and the heat-insulating cavity 2.2, a plurality of heat-drawing parts 2.24 protruding into the heat-insulating cavity 2.2 can be provided. This can increase the contact area between the airflow and the side wall of the smoke guide channel 2.1, thereby improving the heat exchange efficiency between the airflow and the side wall of the smoke guide channel 2.1, so that the airflow flowing through the heat-insulating cavity 2.2 can carry an equal amount of heat back to the smoke guide channel 2.1.

[0088] To improve the overall heat blocking effect, multiple heat-blocking structures as described above can be arranged around the smoke guide channel 2.1, and the heat-blocking cavities 2.2 in each heat-blocking structure are interconnected to form an annular cavity around the outer periphery of the smoke guide channel 2.1, which blocks the heat in the smoke guide shell 2 from overflowing outward in a 360-degree manner.

[0089] At this time, as attached Figure 9As shown, the smoke guide housing 2 mainly consists of an inner housing 2a with an internal smoke guide channel 2.1, and an outer housing surrounding the inner housing 2a. A heat-insulating cavity 2.2 is formed between the inner housing 2a and the outer housing at intervals. The outer housing includes a first outer plate 2b.1 and a second outer plate 2b.2, which are detachably connected by, for example, screws to form the outer housing. Preferably, both the first outer plate 2b.1 and the second outer plate 2b.2 are detachably fixed to the inner housing 2a by, for example, screws. An exhaust duct 2.4 is provided in the inner housing 2a, and an intake duct 2.3 is provided in the outer housing.

[0090] In any of the above schemes, as shown in the appendix Figure 10 As shown, a guide section 2.6 protruding in the smoke guide channel 2.1 can also be provided on the side wall of the smoke guide channel 2.1.

[0091] Specifically, the guide section 2.6 has a hollow interior and is connected to the heat-insulating cavity 2.2; and the outer wall of the guide section 2.6 (i.e., the side wall of the protruding outer surface of the guide section 2.6 for contacting the airflow in the smoke guide channel 2.1) includes: a guide wall 2.61 facing the combustion port 1.11 (i.e., the airflow flowing towards the airflow after being output from the combustion port 1.11), a backflow wall 2.63 facing away from the combustion port 1.11 (i.e., the airflow flowing away from the airflow after being output from the combustion port 1.11), and a connecting wall 2.62 extending vertically (vertically or arcuately) and connecting the guide wall 2.61 and the backflow wall 2.63. For example, see attached... Figure 10 As shown, the outer wall of the flow guide 2.6 includes: a flow guide wall 2.61 facing downward, a back flow wall 2.63 facing upward, and a connecting wall 2.62 extending in an arc shape in the vertical direction.

[0092] The guide wall 2.61 is inclined to guide the airflow flowing upward from the side wall of the smoke guide channel 2.1 to the center of the smoke guide channel 2.1 (the area where the axis of the smoke guide channel 2.1 is located). This allows for better concentration of airflow (air, fuel gas, and high-temperature flue gas) at the center of the smoke guide channel 2.1, improving combustion efficiency and heat concentration, thus facilitating better heat accumulation and output for subsequent heat utilization. Simultaneously, it drives the airflow away from the side wall of the smoke guide channel 2.1, further reducing the outward transfer of heat.

[0093] In this case, as a method, the air outlet 2.4 can be set on the back flow wall 2.63.

[0094] Alternatively, as another approach, the vent 2.4 is disposed on the connecting wall 2.62; and the vent 2.4 is preferably disposed in an inclined manner so that the airflow in the heat-insulating cavity 2.2 can be conveyed obliquely upward after flowing out of the vent 2.4.

[0095] Regardless of the method described above, the airflow generated by combustion in the smoke guide channel 2.1 is unlikely to cause unnecessary obstruction to the airflow in the heat-insulating cavity 2.2, so that the heat-insulating airflow that blocks heat can always be smoothly formed in the heat-insulating cavity 2.2 as described above.

[0096] Furthermore, when the air outlet 2.4 is located on the connecting wall 2.62, the guiding effect of the flow guide wall 2.61 on the airflow will cause the diameter of the smoke guide channel 2.1 at the connecting wall 2.62 to shrink, resulting in increased flow velocity and decreased fluid pressure in this area. This will better attract the airflow in the heat insulation cavity 2.2, further improving the smoothness of the heat insulation airflow (the airflow from the external air inlet 2.3 into the heat insulation cavity 2.2 and then out through the air outlet 2.4 to the smoke guide channel 2.1), thereby improving the overall blocking effect on the overflowing heat and better reducing the surface temperature of the smoke guide shell 2.

[0097] Furthermore, as shown in the appendix Figure 11 As shown, the burner 1 may also have a flange 1.13 located on the outer periphery of the combustion port 1.11, which may be formed by extending outward from the burner housing 1.1. The diameter of the flue gas duct 2.1 is configured to be larger than the diameter of the combustion port 1.11, and the flue gas duct housing 2 is placed on the flange 1.13 of the burner housing 1.1, with the lower end of the side wall of the flue gas duct 2.1 abutting against the flange 1.13, so that the flange 1.13 has a shielding portion that shields the edge of the lower opening of the flue gas duct 2.1. This shielding portion is provided with an air supply channel 1.14 for external air to enter the flue gas duct 2.1.

[0098] In this way, by setting the air supply channel 1.14, the amount of air entering can be further increased so that the gas can be burned more completely. On the other hand, combined with the setting of the above-mentioned guide section 2.6, under the condition that the other settings are the same, adding the air supply channel 1.14 can increase the overall air intake, thereby better improving the gas flow rate in the smoke guide channel 2.1 at the connecting wall 2.62, further contributing to the formation and smooth flow of the heat-resistant airflow, so as to better prevent the heat in the smoke guide channel 2.1 from overflowing outward.

[0099] In some designs, the air supply duct 1.14 can extend vertically so that external airflow flows upward into the smoke guide channel 2.1 through the air supply duct 1.14. Furthermore, the upper opening of the air supply duct 1.14 is positioned close to the side wall of the smoke guide channel 2.1, and preferably below the guide wall 2.61. In this way, the airflow not only replenishes the air as described above, increasing the air velocity, but also, in some cases, forms an upward-flowing air curtain that adheres to the surface of the smoke guide channel 2.1, preventing heat from escaping from the smoke guide channel 2.1 and further enhancing the heat-blocking effect.

[0100] Based on any of the above schemes, especially in the scheme with the flow guide 2.6, as shown in the appendix Figure 12 As shown, at least one side wall of the heat-insulating cavity 2.2 may also be provided with a protrusion facing the center region of the smoke-guiding channel 2.1 (the region where the axis of the smoke-guiding channel 2.1 is located, which is often also the region where high-temperature flue gas accumulates) in the lateral direction. The arrangement of this protrusion is such that: in the vertical direction, the diameter (diameter or size of the cavity opening) of the heat-insulating cavity 2.2 is arranged in a large-small-large pattern (i.e., an arrangement that first decreases and then increases); and the region where the diameter of the heat-insulating cavity 2.2 decreases is positioned in the lateral direction opposite to the center region of the smoke-guiding channel 2.1.

[0101] For example, attached Figure 12 As shown, the heat-insulating cavity 2.2 has a first protrusion 2.21 on one side wall of the heat-insulating cavity 2.2 that is laterally opposite to the central region of the smoke-guiding channel 2.1 and protrudes into the heat-insulating cavity 2.2; or, the heat-insulating cavity 2.2 has a second protrusion 2.22 on one side wall of the heat-insulating cavity 2.2 that is laterally opposite to the central region of the smoke-guiding channel 2.1 and protrudes into the heat-insulating cavity 2.2.

[0102] By setting a protrusion, the airflow velocity in the heat-insulating cavity 2.2 can be increased to a certain extent when flowing through the narrow opening area that is laterally opposite to the central area of ​​the flue gas channel 2.1. This not only increases the contact area between the airflow and the flue gas housing 2, thus better carrying the heat transferred to the side wall of the flue gas channel 2.1 back into the flue gas channel 2.1 and optimizing the heat insulation effect, but also, based on the working characteristics of the combustion components in the gas water heater, under a certain airflow flow, areas where heat is more easily lost can be carried back to the flue gas channel 2.1 more quickly through a faster airflow; while other areas where heat loss is slower are carried back to the flue gas channel 2.1 through a slower but larger airflow, which is stable, slow, and sufficient for heat transfer with the side wall of the flue gas channel 2.1, thereby improving the overall heat insulation effect.

[0103] In some designs, the cross-sectional area of ​​the protrusion can be gradually increased from top to bottom to better drive the airflow to flow smoothly from top to bottom in the heat-insulating cavity 2.2.

[0104] Furthermore, the side wall of the heat-insulating cavity 2.2 facing away from the smoke-guiding channel 2.1 (i.e., the side wall of the heat-insulating cavity 2.2 that is laterally away from the smoke-guiding channel 2.1) has a portion laterally aligned with the protrusion. This portion may also be provided with a flow-inlet channel 2.23 for external air to flow into the heat-insulating cavity 2.2. When a heat-insulating airflow is formed as described above, the external airflow can flow into the heat-insulating cavity 2.2 more quickly through the flow-inlet channel 2.23, increasing the overall flow rate of the heat-insulating airflow, further optimizing and improving the blocking effect on overflowing heat, and better reducing the surface temperature of the smoke-guiding shell 2.

[0105] The above description is only a preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model.

Claims

1. A combustion heat exchange assembly, characterized in that, include: A burner (1) for forming a flame, the burner (1) having a combustion port (1.11) for the flame to be ejected outward; A heat exchanger (3) positioned above the burner (1) includes a heat exchange shell (3.1), a heat exchange pipe (3.2), and heat exchange fins (3.3). The heat exchange shell (3.1) has a heat exchange channel (3.11), the heat exchange pipe (3.2) has a heat exchange portion placed in the heat exchange channel (3.11), and the heat exchange fins (3.3) are placed in the heat exchange channel (3.11) and are in contact with the heat exchange portion. The smoke guide housing (2) has a smoke guide channel (2.1) that is connected to the combustion port (1.11) and discharges the flue gas generated by combustion upward to the heat exchange channel (3.11). The lower end opening of the smoke guide channel (2.1) is connected to the combustion port (1.11) so that a combustion zone for flame combustion is formed in the smoke guide channel (2.1). A heat-resistant structure is formed in the sidewall of the smoke guiding channel (2.1), the heat-resistant structure comprising: A heat-insulating cavity (2.2) is disposed in the side wall of the smoke guiding channel (2.1); An air outlet (2.4) is provided to connect the heat-insulating cavity (2.2) with the smoke guiding channel (2.1); An air inlet (2.3) is connected to the upper region of the heat-insulating cavity (2.2) and allows the heat-insulating cavity (2.2) to communicate with the outside air.

2. The combustion heat exchange assembly according to claim 1, characterized in that: The vent (2.4) is connected to the lower region of the heat-insulating cavity (2.2).

3. The combustion heat exchange assembly according to claim 1, characterized in that: The heat exchange fin (3.3) includes a fin body (3.31), which has at least two insertion holes (3.32) arranged at intervals in the transverse direction; The heat exchange pipe (3.2) extends in a curved manner and passes through the two insertion holes (3.32) in sequence; One side of the fin body (3.31) has a raised smoke-blocking structure, which is placed in the middle area of ​​the two insertion holes (3.32) and drives the flue gas flowing from bottom to top to flow to the insertion holes (3.32) on both sides.

4. The combustion heat exchange assembly according to claim 3, characterized in that: The smoke-blocking structure includes: a first smoke-blocking part (3.34), a second smoke-blocking part (3.35), and a third smoke-blocking part (3.36) arranged sequentially from bottom to top; In the direction from bottom to top, the width of the first smoke-blocking part (3.34), the second smoke-blocking part (3.35), and the third smoke-blocking part (3.36) gradually increases.

5. The combustion heat exchange assembly according to claim 4, characterized in that: In the vertical direction, the first smoke-blocking part (3.34) is configured to be lower than the center of the two insertion holes (3.32).

6. The combustion heat exchange assembly according to claim 5, characterized in that: In the vertical direction, the third smoke-blocking part (3.36) is configured to be higher than the two insertion holes (3.32); Furthermore, the lower end face of the third smoke-blocking part (3.36) is a downwardly convex arc-shaped surface.

7. The combustion heat exchange assembly according to claim 5, characterized in that: The second smoke-blocking part (3.35) includes: A first guide plate (3.351) extending at an angle is configured to guide flue gas flowing from bottom to top to the upper end of one of the insertion holes (3.32); A second guide plate (3.352) extending at an angle is configured to guide the flue gas flowing from bottom to top to the upper end of another insertion port (3.32); Furthermore, the lower end of the first guide plate (3.351) is close to or connected to the lower end of the second guide plate (3.352).

8. The combustion heat exchange assembly according to any one of claims 1 to 7, characterized in that: The sidewall of the smoke guide channel (2.1) is provided with a guide portion (2.6) protruding into the smoke guide channel (2.1); The interior of the flow guide (2.6) is hollow and is connected to the heat-insulating cavity (2.2); Furthermore, the outer wall of the guide portion (2.6) includes: The guide wall (2.61) facing the combustion port (1.11) is inclined so as to guide the airflow flowing upward from the side wall of the smoke guide channel (2.1) to the center of the smoke guide channel (2.1); Backflow wall (2.63) facing away from the combustion port (1.11); And a connecting wall (2.62) that extends vertically and connects the flow-guiding wall (2.61) to the backflow wall (2.63); The air outlet (2.4) is disposed on the backflow wall (2.63).

9. The combustion heat exchange assembly according to any one of claims 1 to 7, characterized in that: The sidewall of the smoke guide channel (2.1) is provided with a guide portion (2.6) protruding into the smoke guide channel (2.1); The interior of the flow guide (2.6) is hollow and is connected to the heat-insulating cavity (2.2); Furthermore, the outer wall of the guide portion (2.6) includes: The guide wall (2.61) facing the combustion port (1.11) is inclined so as to guide the airflow at the side wall of the smoke guide channel (2.1) to the center of the smoke guide channel (2.1); Backflow wall (2.63) facing away from the combustion port (1.11); And a connecting wall (2.62) that extends vertically and connects the flow-guiding wall (2.61) to the backflow wall (2.63); The air outlet (2.4) is disposed on the connecting wall (2.62).

10. A gas-fired water heater, characterized in that: It includes the combustion heat exchange component as described in any one of claims 1 to 9.

Images