Combustion system and gas water heater with same

Abstract

The utility model relates to the technical field of water heaters, in particular to a combustion system and a gas water heater with the same, and the combustion system comprises a combustor and a smoke collecting hood body with a first smoke collecting cavity; a smoke outlet of the combustor is communicated with the first smoke collecting cavity through a smoke exhaust channel, and a smoke exhaust pipe is arranged on the smoke collecting hood body and provided with a second smoke collecting cavity communicated with the first smoke collecting cavity; the smoke exhaust pipe is provided with a smoke exhaust port and a backflow port which are communicated with the second smoke collecting cavity; the reflux inlet is communicated with a reflux pipe; the second smoke collecting cavity is internally provided with a guide plate for guiding smoke entering the second smoke collecting cavity to the reflux inlet; the flow guide plate is rotatably arranged in the second smoke collection cavity, and the flow guide plate is rotated by different angles so that the amount of smoke guided into the backflow opening can be changed. Therefore, the combustion system capable of regulating and controlling the smoke backflow amount is formed.

Description

Technical Field

[0001] The utility model relates to the technical field of water heaters, and more particularly to a combustion system and a gas water heater with the system. Background Art

[0002] In the current market, "high energy efficiency" and "low environmental impact" have become the focus of consumer attention. Based on this, gas water heaters with flue gas recirculation have emerged in the existing technology. This is achieved by improving the combustion system in gas water heaters so that some of the flue gas generated by combustion can be recirculated and re-enter the combustion process.

[0003] The combustion system with flue gas recirculation in the existing gas water heater mainly diverts part of the flue gas generated by combustion in the combustion system to the air inlet of the burner in the combustion system by setting up a recirculation piece or a recirculation pipe, so that this part of the recirculated flue gas and fresh air enter the burner together to participate in combustion, thereby improving the combustion efficiency and realizing the effective reuse of part of the flue gas.

[0004] It should be noted that the existing combustion systems with flue gas recirculation are often unable to regulate the flue gas recirculation volume. When the combustion system is placed in different environments (for example, when placed in different users' homes, the smoke exhaust resistance it faces is different), it is easy to directly cause the flue gas recirculation volume to be too high or too low, thereby affecting the combustion efficiency and failing to maintain an efficient and stable combustion state. Utility Model Content

[0005] One of the purposes of the present invention is to address the deficiencies of the prior art and provide a combustion system capable of regulating the amount of flue gas recirculation, so as to better maintain an efficient and stable combustion state under different environments.

[0006] The second purpose of the present utility model is to provide a gas water heater with the above combustion system.

[0007] The technical solutions of this utility model are as follows:

[0008] Combustion system, including:

[0009] The burner has a smoke collecting hood body with a first smoke collecting cavity;

[0010] The smoke outlet of the burner is connected to the first smoke collecting chamber through a smoke exhaust channel. The smoke collecting hood body is provided with a smoke exhaust pipe, which has: a second smoke collecting chamber connected to the first smoke collecting chamber;

[0011] The smoke exhaust pipe is provided with: a smoke exhaust port and a return port connected to the second smoke collecting chamber;

[0012] The return port is connected to a return pipe, which is configured to: guide the flue gas in the return port to the air inlet of the burner;

[0013] The second smoke collecting chamber is provided with: a guide plate for guiding the smoke entering the second smoke collecting chamber to the return flow port;

[0014] The guide plate is rotatably mounted in the second smoke collecting chamber, and the amount of smoke directed to the return flow port can be changed by rotating the guide plate to different angles.

[0015] As a further preferred solution, the guide plate is connected to a driving device for driving the guide plate to rotate, so as to:

[0016] The guide plate is driven to rotate at different angles by a driving device to change the amount of smoke directed to the return flow port.

[0017] As a further preferred solution, the burner is provided with: an air intake cover for covering the air intake;

[0018] The air intake cover is provided with an air intake groove, and the notch of the air intake groove is connected to the air intake port;

[0019] The air intake cover is provided with: a second air intake port connected to the air intake slot, and a first air intake port connected to the air intake slot and for air to enter;

[0020] One end of the return pipe away from the return port is connected to the second air inlet and is communicated with the air inlet groove through the second air inlet.

[0021] As a further preferred solution, the second air inlet is provided on: a side wall of the air inlet groove that is not opposite to the air inlet;

[0022] And / or, the first air inlet is arranged on a side wall of the air inlet groove that is not opposite to the air inlet.

[0023] As a further preferred solution, the second air inlet and the first air inlet are arranged in a non-aligned manner.

[0024] As a further preferred solution, a flow stabilizer is installed in the air inlet groove, which divides the air inlet groove into: a first groove body close to and connected to the air inlet, and a second groove body away from the air inlet;

[0025] The second air inlet and the first air inlet are both arranged on the groove wall of the second groove body;

[0026] The flow stabilizing plate is provided with a plurality of air inlet holes for supplying air flow from the second trough body to the first trough body.

[0027] As a further preferred solution, both ends of the flow stabilizer plate have: an abutment portion protruding toward the bottom surface of the air inlet groove;

[0028] The abutment portion is arranged to match the bottom surface and the notch of the air inlet groove so that:

[0029] When the notch of the air inlet groove faces upward, the two abutting portions are abutted against the bottom surface of the air inlet groove, so that the flow stabilizer is placed in the air inlet groove in a horizontal state.

[0030] As a further preferred solution, a plurality of air inlet holes are evenly distributed on the flow stabilizing plate.

[0031] As a further preferred embodiment, the smoke exhaust passage, the first smoke collecting chamber and the second smoke collecting chamber jointly form: a smoke flow passage for smoke circulation;

[0032] The driving device is arranged outside the flue gas flow passage.

[0033] As a further preferred solution, a return fan is provided in the return duct, which is configured to provide power to the smoke in the return duct to drive it to flow from the return port to the air inlet.

[0034] A gas water heater comprises a combustion system according to any of the above schemes.

[0035] The main beneficial effects of the above technical solution are:

[0036] The guide plate can be driven to rotate to different angles through a driving device to change the amount of smoke directed from the smoke collecting chamber to the return port (i.e., the amount of smoke reflux); the amount of smoke reflux can be adaptively regulated according to different environmental requirements, so that the combustion system can perform combustion more efficiently and stably with an appropriate amount of smoke reflux in any environment.

[0037] Further or more detailed beneficial effects will be described in conjunction with specific examples in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will be further described below with reference to the accompanying drawings:

[0039] Figure 1 Schematic diagram of the overall structure of the combustion system.

[0040] Figure 2 This is a schematic diagram of the smoke hood structure when the return port is set on the smoke exhaust pipe.

[0041] Figure 3 This is a schematic diagram of the smoke diversion when the guide plate is set in the second smoke collecting chamber.

[0042] Figure 4 Schematic diagram of the installation of the baffle.

[0043] Figure 5 This is a schematic diagram of the installation of the air intake cover.

[0044] Figure 6 This is a schematic diagram of the flow stabilizer installation.

[0045] Figure 7 Schematic diagram of the return pipe structure.

[0046] As shown in the figure: burner-1, smoke outlet-1.1, air inlet-1.2, air inlet hood-1a, air inlet slot-1a.1, first slot body-1a.11, second slot body-1a.12, second air inlet-1a.2, first air inlet-1a.3, flow stabilizer-1b, air inlet hole-1b.1, abutment part-1b.2, smoke hood-2, smoke hood body-2a, first smoke collecting chamber-2a.1, smoke exhaust pipe-2b, second smoke collecting chamber-2b.1, Smoke collecting chamber 2.1, smoke inlet 2.11, smoke exhaust outlet 2.12, return outlet 2.13, heat exchanger 3, smoke exhaust duct 3.1, return pipe 4, first return pipe body 4.1, second return pipe body 4.2, connecting pipe body 4.3, guide plate 5, drive device 6, baffle 7, baffle 8, guide hole 8.1, bend 8.2, return fan 9, impeller 9.1, drive element 9.2, fan 10. DETAILED DESCRIPTION

[0047] The present invention is specifically described below with reference to the embodiments:

[0048] Example 1:

[0049] The combustion system is mainly used to burn gas in a gas water heater or a heating device similar to a gas water heater to generate high-temperature flue gas.

[0050] As attached Figure 1 To the attached Figure 7 As shown in the figure, the combustion system mainly includes a burner 1 that receives gas and ignites and burns the gas, a smoke hood 2 that receives high-temperature flue gas and discharges the high-temperature flue gas, and a smoke exhaust channel 3.1 that transmits the high-temperature flue gas generated by the burner 1 to the smoke hood 2.

[0051] In this embodiment, as shown in the attached Figure 1 As shown, the bottom of the burner 1 has an air inlet 1.2 for air entry, a gas inlet for gas entry on the side of the burner 1, and a smoke exhaust port 2.12 for flue gas exiting. The air inlet 1.2 is connected to the smoke exhaust port 2.12 via an air flow channel within the burner 1, and the gas inlet is connected to the smoke exhaust port 2.12 via a gas flow channel within the burner 1. An ignition device is provided at the smoke exhaust port 2.12. When air enters the air inlet 1.2 and flows to the smoke exhaust port 2.12, and when gas enters the gas inlet and flows to the smoke exhaust port 2.12, the ignition device ignites the gas, causing it to burn and form high-temperature flue gas, which is then discharged upward from the smoke exhaust port 2.12.

[0052] A smoke hood 2 is positioned to one side of the burner 1, preferably above the burner 1. A smoke chamber 2.1 is formed hollow within the smoke hood 2. A smoke inlet 2.11 is provided at the bottom of the smoke hood 2, communicating with the smoke chamber 2.1 for admitting smoke into the chamber 2.1. The smoke inlet 2.11 is preferably aligned with a smoke exhaust port 2.12. Furthermore, a smoke exhaust port 2.12 is provided on the smoke hood 2, communicating with the chamber 2.1 for discharging smoke from the chamber 2.1.

[0053] The lower end of the smoke exhaust duct 3.1 is connected to and communicates with the smoke exhaust port 2.12 of the burner 1, and the upper end is connected to and communicates with the smoke inlet 2.11 of the smoke hood 2. This allows smoke generated by the burner 1 to flow upward through the smoke exhaust duct 3.1 into the smoke collection chamber 2.1 and be discharged outward through the smoke exhaust port 2.12. When the combustion system is used in a gas water heater, a heat exchanger 3 is provided between the burner 1 and the smoke hood 2. The smoke exhaust duct 3.1 is a channel structure formed within the heat exchanger 3 for the flow of smoke.

[0054] Furthermore, in order to be able to reflux part of the flue gas for reuse to improve combustion efficiency.

[0055] In this embodiment, as shown in the attached Figure 1 As shown in FIG, a return port 2.13 is further provided on the smoke collecting hood 2. The return port 2.13 is connected to a return pipe 4, which is configured to guide the smoke in the return port 2.13 to the air inlet 1.2 of the burner 1.

[0056] That is, one end of the return pipe 4 is connected to and in communication with the return port 2.13, while the other end is positioned near, and preferably aligned with, the air inlet 1.2 of the burner 1. This ensures that, after the smoke enters the smoke collecting chamber 2.1 as described above, some of the smoke can flow from the return port 2.13 through the return pipe 4 to the air inlet 1.2. At this point, air enters the burner 1 from the air inlet 1.2, and the returned smoke also enters the burner 1 from the air inlet 1.2. When the smoke reaches the air inlet 1.2, it mixes with fresh air and enters the burner 1 for combustion, thereby achieving smoke recirculation and reuse, and improving overall combustion efficiency.

[0057] Furthermore, in order to allow air to enter the burner 1 better and smoke to be discharged more quickly, the combustion system may also be provided with a fan 10 configured to introduce external air into the air inlet 1.2 of the burner 1 and drive the smoke to be discharged from the smoke outlet 2.12.

[0058] In this embodiment, the smoke exhaust channel 3.1, the first smoke collecting chamber 2a.1 and the second smoke collecting chamber 2b.1 together form a smoke flow passage for smoke to circulate; the fan 10 can be arranged in the smoke flow passage. Alternatively, as shown in the attached Figure 1As shown in FIG, the fan 10 is preferably disposed at the air inlet 1.2, and is configured to blow external air into the burner 1 through the air inlet 1.2.

[0059] However, the reflux rate of flue gas in the above-mentioned combustion system cannot be regulated. When the combustion system is placed in different environments (for example, when placed in different users' homes, the smoke exhaust resistance it faces is different) to operate, it is easy to directly cause the reflux rate of flue gas to be too high or too low, thereby affecting the combustion efficiency and making it impossible to carry out combustion work more efficiently and stably.

[0060] Based on this, as attached Figure 1 To the attached Figure 3 As shown in FIG, in this embodiment, a guide plate 5 is provided in the smoke collecting chamber 2.1 to guide the smoke entering the smoke collecting chamber 2.1 to the return flow port 2.13. The guide plate 5 is rotatably mounted in the smoke collecting chamber 2.1. By rotating the guide plate 5 to different angles, the amount of smoke directed to the return flow port 2.13 can be varied, and the amount of smoke discharged can also be adjusted and varied.

[0061] The guide plate 5 can be rotatably mounted in the smoke collecting chamber 2.1 by a commonly used rotating connection structure (e.g., a pin connection structure). When the angular position of the guide plate 5 needs to be adjusted, the guide plate 5 is manually driven to rotate to different angles to change the amount of smoke directed to the return port 2.13.

[0062] Alternatively, preferably, the guide plate 5 can be connected to a driving device 6 for driving it to rotate (the driving device 6 is preferably a rotating motor for driving the guide plate 5 to rotate), so that: the driving device 6 can drive the guide plate 5 to rotate to different angles, thereby changing the amount of flue gas directed to the return port 2.13.

[0063] Specifically, in this embodiment:

[0064] As attached Figure 2 To the attached Figure 3 As shown, the smoke hood 2 comprises: a smoke hood body 2a having a smoke inlet 2.11 at the bottom, and a smoke exhaust pipe 2b connected to the top of the smoke hood body 2a.

[0065] Among them, as attached Figure 3 As shown in FIG, a first smoke collection chamber 2a.1 is formed in the smoke hood body 2a as a hollow structure, and a second smoke collection chamber 2b.1 is formed in the smoke exhaust pipe 2b as a hollow structure. A smoke inlet 2.11 at the bottom of the smoke hood body 2a is connected to the first smoke collection chamber 2a.1, and the first smoke collection chamber 2a.1 and the second smoke collection chamber 2b.1 are connected to form the smoke collection chamber 2.1.

[0066] As attached Figure 3As shown, in this embodiment, both the smoke exhaust port 2.12 and the return port 2.13 are disposed within the smoke exhaust pipe 2b. Specifically, in this embodiment, the smoke exhaust port 2.12 is preferably disposed at the top of the smoke exhaust pipe 2b and communicates with the second smoke collecting chamber 2b.1, facilitating the upward discharge of smoke. Depending on whether the return pipe 4 is inserted into the smoke exhaust pipe 2b, the return port 2.13 can be disposed on the sidewall of the smoke exhaust pipe 2b and communicate with the second smoke collecting chamber 2b.1. Alternatively, the return port 2.13 can be disposed within the smoke exhaust pipe 2b and communicate with the second smoke collecting chamber 2b.1 (when one end of the return pipe 4 is inserted into the smoke exhaust pipe 2b). Furthermore, the deflector 5 is rotatably mounted within the second smoke collecting chamber 2b.1.

[0067] Specifically, the guide plate 5 is preferably positioned relative to the return port 2.13 (for example, Figure 6 In the embodiment, the guide plate 5 is positioned on the left side of the return port 2.13 and is arranged in the second smoke collecting chamber 2b.1. Moreover, the two ends of the guide plate 5 are rotatably connected to the smoke exhaust pipe 2b; at the same time, the smoke exhaust channel 3.1, the first smoke collecting chamber 2a.1 and the second smoke collecting chamber 2b.1 jointly form a smoke flow passage for smoke circulation; in order to prevent the smoke from affecting the drive device 6, the drive device 6 is arranged outside the smoke flow passage. At this time, the drive device 6 is preferably fixed to the outer surface of the smoke exhaust pipe 2b, and one end of the guide plate 5 passes through the smoke exhaust pipe 2b and is transmission-connected to the drive device 6, so that the drive device 6 can drive the guide plate 5 to rotate.

[0068] At this time, as attached Figure 3 As shown in Figures C and D, by rotating the guide plate 5 to different angles via the drive device 6, the amount of smoke directed from the second smoke collecting chamber 2b.1 to the return port 2.13 (i.e., the amount of smoke reflux) can be varied. This allows for adaptive regulation of the amount of smoke reflux based on varying environmental requirements, ensuring that the combustion system operates more efficiently and stably with the appropriate amount of smoke reflux in any environment.

[0069] Furthermore, in order to achieve fixed-point and directional exhaust of smoke, the smoke exhaust pipe 2b is preferably a cylindrical tube structure, in which the second smoke collecting chamber 2b.1 serves as a smoke exhaust channel, and the channel diameter for smoke flow is often small, so the smoke will flow at a relatively high speed inside it, and the fast-flowing smoke is often easy to cause impact on the guide plate 5, affecting its stability.

[0070] At this time, in this embodiment, as shown in the attached Figure 4As shown, a baffle 8 can also be provided in the first smoke collecting chamber 2a.1 to cover the second smoke collecting chamber 2b.1 in the direction from the smoke inlet 2.11 to the smoke exhaust pipe 2b. The edge of the baffle 8 is spaced apart from the sidewall of the first smoke collecting chamber 2a.1 to form a channel for smoke to flow from the first smoke collecting chamber 2a.1 to the second smoke collecting chamber 2b.1. The baffle 8 is also provided with a plurality of guide holes 8.1 for smoke to flow from the first smoke collecting chamber 2a.1 to the second smoke collecting chamber 2b.1. By providing the baffle 8 in the first smoke collecting chamber 2a.1, while minimizing the obstruction to the exhaust of smoke to ensure smooth exhaust of smoke, the baffle 8 can also reduce the smoke flow velocity in the area where the guide plate 5 is located, reducing the impact of the smoke on the guide plate 5, so that the guide plate 5 can stably rotate or stably stop at a certain angle to maintain a stable smoke reflux rate. At the same time, by providing the baffle 8, the flow rate of the flue gas in the area of ​​the exhaust channel 3.1 opposite to the exhaust pipe 2b and where the flue gas flows at a high speed can be reduced, so that the flow rate of the flue gas in other areas of the exhaust channel 3.1 not opposite to the exhaust pipe 2b is close to the flow rate of the flue gas in the exhaust channel 3.1, thereby achieving the uniformity of the overall flow rate of the balanced exhaust channel 3.1, ensuring that the overall flow rate of the flue gas is more uniform, and optimizing the heat exchange uniformity of the heat exchanger 3 and the uniformity of the combustion flame in the burner 1.

[0071] In this embodiment, a bent portion 8.2 is provided on the edge of the baffle 8, and the baffle 8 is installed by fixing the bent portion 8.2 to the smoke hood body 2a with screws.

[0072] Based on any of the above options.

[0073] As attached Figure 5 To the attached Figure 6 As shown in , in this embodiment, an air intake cover 1a can also be provided on the burner 1. The air intake cover 1a is preferably detachably fixed to the burner 1 by, for example, screws, and when the air intake cover 1a is fixed to the burner 1, it covers the air inlet 1.2.

[0074] As attached Figure 5 As shown in the figure, the air intake cover 1a is also provided with: an air intake groove 1a.1 with an opening facing the air intake port 1.2 and connected to the air intake port 1.2; when the air intake cover 1a is fixed to the burner 1, the air intake port 1.2 is docked with the notch of the air intake groove 1a.1 to achieve the connection between the air intake port 1.2 and the air intake groove 1a.1.

[0075] As attached Figure 5 To the attached Figure 6As shown, the air intake cover 1a is provided with a second air intake port 1a.2 communicating with the air intake groove 1a.1, and a first air intake port 1a.3 communicating with the air intake groove 1a.1 for air to enter. The end of the return pipe 4, remote from the return port 2.13, is connected to the second air intake port 1a.2 and communicates with the air intake groove 1a.1 through the second air intake port 1a.2.

[0076] At this time, the first air inlet 1a.3 serves as the air inlet for external air. The fan 10 is preferably arranged at the first air inlet 1a.3 and is configured to: blow the external air from the first air inlet 1a.3 into the air inlet groove 1a.1, and then enter the air inlet 1.2 through the air inlet groove 1a.1.

[0077] Implementation: Fresh air and flue gas returning from the return pipe 4 can be pre-mixed in the air inlet groove 1a.1, and then enter the burner 1 together from the air inlet 1.2 for combustion, so as to better improve the combustion effect.

[0078] To better mix the fresh air and the flue gas returning from the return pipe 4 in the air inlet slot 1a.1, thereby improving mixing uniformity and enhancing combustion efficiency, in this embodiment, the first air inlet 1a.3 is preferably located on a sidewall of the air inlet slot 1a.1 that is not opposite the air inlet 1.2; and the second air inlet 1a.2 may also be preferably located on a sidewall of the air inlet slot 1a.1 that is not opposite the air inlet 1.2.

[0079] In this way, neither air nor returned flue gas flows into the air inlet groove 1a.1 toward the air inlet port 1.2, but flows into the air inlet groove 1a.1 from the side wall of the air inlet groove 1a.1. After the gas flows in, it collides with the inner wall of the air inlet groove 1a.1 to slow down the flow rate, so that the fresh air and the returned flue gas have more time to mix.

[0080] Furthermore, the second air inlet 1a.2 and the first air inlet 1a.3 are preferably arranged in a non-aligned manner, which can better prevent fresh air from obstructing the return flue gas from flowing into the air inlet slot 1a.1, or the return flue gas from obstructing the fresh air from flowing into the air inlet slot 1a.1.

[0081] Furthermore, as attached Figure 5 To the attached Figure 6 A flow stabilizer plate 1b can also be installed in the air inlet trough 1a.1, dividing the air inlet trough 1a.1 into a first trough body 1a.11 adjacent to and connected to the air inlet 1.2, and a second trough body 1a.12 further away from the air inlet 1.2. The second air inlet 1a.2 and the first air inlet 1a.3 are both located on the wall of the second trough body 1a.12. The flow stabilizer plate 1b is provided with a plurality of air inlet holes 1b.1 for airflow from the second trough body 1a.12 to the first trough body 1a.11.

[0082] At this time, whether it is the fresh air entering the second trough body 1a.12 from the first air inlet 1a.3 or the return flue gas entering the second trough body 1a.12 from the second air inlet 1a.2, under the flow resistance of the flow stabilizer 1b, they will tend to diffuse in the second trough body 1a.12 to fill the second trough body 1a.12; in this way, the diffused fresh air and return flue gas can be mixed faster and more evenly; moreover, the gas in the second trough body 1a.12 enters the first trough body 1a.11 through several air inlet holes 1b.1. During the flow process, the fresh air and return flue gas will be dispersed and flow into the first trough body 1a.11, and better secondary mixing will be achieved in the first trough body 1a.11, further improving the mixing effect.

[0083] In this embodiment, a plurality of air inlet holes 1b.1 are evenly distributed on the flow stabilizer 1b. In this way, on the one hand, the mixed gas can flow evenly to the first trough body 1a.11 through the plurality of air inlet holes 1b.1, and evenly flow to the air inlet 1.2 through the first trough body 1a.11 to participate in the combustion, thereby improving the uniformity of combustion; on the other hand, the fresh air and the return flue gas can be more evenly dispersed, and then can be more evenly mixed for the second time in the first trough body 1a.11, thereby improving the uniformity of mixing and thereby improving the uniformity and stability of subsequent combustion.

[0084] On the basis of the above, as attached Figure 6 As shown, both ends of the flow stabilizer 1b have: an abutment portion 1b.2 that protrudes toward the bottom surface of the air inlet groove 1a.1; the abutment portion 1b.2 is arranged to match the bottom surface and the slot opening of the air inlet groove 1a.1, so that: when the slot opening of the air inlet groove 1a.1 faces upward, the flow stabilizer 1b is placed in the air inlet groove 1a.1 in a horizontal state (that is, the upper surface of the flow stabilizer 1b is horizontal or nearly horizontal) by abutting both abutment portions 1b.2 against the bottom surface of the air inlet groove 1a.1.

[0085] In this way, not only can the stability of the installation of the flow stabilizer 1b be improved; but also when the flow stabilizer 1b is installed in the air inlet groove 1a.1, the openings of the several air inlet holes 1b.1 on the flow stabilizer 1b can be arranged opposite to the slot of the air inlet groove 1a.1, and the air flow can enter the first slot body 1a.11 and enter the air inlet 1.2 more evenly from the second slot body 1a.12.

[0086] Furthermore, the flow stabilizer plate 1b can be detachably fixed to the air intake cover 1a by means of fasteners such as screws, which not only improves the stability of the flow stabilizer plate 1b but also makes the flow stabilizer plate 1b easy to remove and replace.

[0087] Moreover, the edge of the flow stabilizing plate 1b can be bent to form a flange structure to improve the structural strength of the flow stabilizing plate 1b so that it can withstand the impact of fresh air and return flue gas.

[0088] Considering that when the combustion system is used in a gas water heater, the combustion system has multiple different combustion states according to the set temperature. When the combustion is more intense, the backflowing flue gas is likely to be retained in the return pipe 4, resulting in obstruction of the overall flow of the flue gas.

[0089] Therefore, on the basis of the above, Figure 1 As shown in FIG, in this embodiment, a return fan 9 may be further provided in the return duct 4, which is configured to provide power to the smoke in the return duct 4 to drive it to flow from the return port 2.13 to the air inlet 1.2.

[0090] Specifically, in this embodiment, the return fan 9 includes: an impeller 9.1 placed in the return duct 4; and a driving member 9.2 (the driving member 9.2 is preferably a rotating motor that drives the impeller 9.1 to rotate), and the driving member 9.2 is transmission-connected to the impeller 9.1 and is used to drive the impeller 9.1 to rotate.

[0091] The driving member 9.2 can be electrically connected to the control mainboard of the combustion system. When the combustion system is in combustion operation, the control mainboard synchronously controls the driving member 9.2 to start, thereby driving the impeller 9.1 to rotate, providing continuous and stable power to the flue gas in the return pipe 4, driving it to flow from the return port 2.13 to the air inlet 1.2.

[0092] Of course, the driving member 9.2 can also be configured to increase the speed of the impeller 9.1 as the combustion temperature set by the control main board increases, so as to better adapt to the different combustion conditions of the combustion system and ensure that the flue gas can always flow stably and smoothly in the return pipe 4.

[0093] In order to avoid the erosion of the driving member 9.2 by the smoke, the driving member 9.2 is preferably placed outside the return pipe 4. Figure 7 As shown in FIG, the driving member 9.2 is fixed to the outer wall of the return pipe 4, and the rotating shaft of the impeller 9.1 passes through the return pipe 4 and is transmission-connected to the driving member 9.2.

[0094] Furthermore, in order to facilitate the overall maintenance or replacement of the return fan 9, in this embodiment, as shown in the attached Figure 7 As shown in the figure, the return pipe 4 includes a first return pipe body 4.1, a second return pipe body 4.2, and a connecting pipe body 4.3 that connects the first return pipe body 4.1 and the second return pipe body 4.2; the connecting pipe body 4.3 is detachably arranged between the first return pipe body 4.1 and the second return pipe body 4.2, and the return fan 9 is fixedly connected to the connecting pipe body 4.3.

[0095] Example 2:

[0096] A gas water heater comprises a water heater shell, a water supply pipeline for circulating water, and a combustion system as described in any one of the schemes in embodiment 1.

[0097] The combustion system is placed in the water heater shell, and the water supply pipeline has a portion connected to the side wall of the smoke exhaust channel 3.1, or the water supply pipeline has a portion inserted into the smoke exhaust channel 3.1.

[0098] The above description is merely a preferred embodiment of the present invention and does not limit the scope of the present invention. In addition, the terms "vertical," "horizontal," "front," and "rear" used in the embodiments of the present invention to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product is typically placed when in use, are intended only to facilitate the description of the present invention and simplify the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. It should be further noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," and "fixed" used in the description should be understood broadly. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or internal communication between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood based on the specific circumstances. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0099] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. Combustion system, characterized in that, include: A burner (1) having a smoke collecting hood body (2a) with a first smoke collecting chamber (2a.1); The smoke outlet (1.1) of the burner (1) is connected to the first smoke collecting chamber (2a.1) via a smoke exhaust channel (3.1); a smoke exhaust pipe (2b) is provided on the smoke collecting hood body (2a), which comprises: a second smoke collecting chamber (2b.1) connected to the first smoke collecting chamber (2a.1); The smoke exhaust pipe (2b) is provided with: a smoke exhaust port (2.12) and a return port (2.13) connected to the second smoke collecting chamber (2b.1); The return port (2.13) is connected to a return pipe (4), which is configured to: guide the flue gas in the return port (2.13) to the air inlet (1.2) of the burner (1); The second smoke collecting chamber (2b.1) is provided with: a guide plate (5) for guiding the smoke entering the second smoke collecting chamber (2b.1) to the return flow port (2.13); The guide plate (5) is rotatably mounted in the second smoke collecting chamber (2b.1), and the amount of smoke directed to the return port (2.13) can be changed by rotating the guide plate (5) at different angles.

2. The combustion system according to claim 1, characterized in that: The guide plate (5) is connected to a driving device (6) for driving the guide plate (5) to rotate, so as to: The driving device (6) drives the guide plate (5) to rotate at different angles, thereby changing the amount of smoke directed into the return flow port (2.13).

3. The combustion system according to claim 1, characterized in that: The burner (1) is provided with: an air intake cover (1a) for covering the air intake port (1.2); The air intake cover (1a) is provided with an air intake groove (1a.1), and the notch of the air intake groove (1a.1) is connected to the air intake port (1.2); The air intake cover (1a) is provided with: a second air intake (1a.2) connected to the air intake groove (1a.1), and a first air intake (1a.3) connected to the air intake groove (1a.1) and for air to enter; One end of the reflux pipe (4) away from the reflux port (2.13) is connected to the second air inlet (1a.2) and is connected to the air inlet groove (1a.1) through the second air inlet (1a.2).

4. The combustion system according to claim 3, characterized in that: The second air inlet (1a.2) is arranged on: a side wall of the air inlet groove (1a.1) that is not opposite to the air inlet (1.2); And / or, the first air inlet (1a.3) is arranged on a side wall of the air inlet groove (1a.1) that is not opposite to the air inlet (1.2).

5. The combustion system according to claim 3, characterized in that: The second air inlet (1a.2) and the first air inlet (1a.3) are arranged in a non-aligned manner.

6. The combustion system according to claim 3, characterized in that: A flow stabilizing plate (1b) is installed in the air inlet groove (1a.1), which divides the air inlet groove (1a.1) into: a first groove body (1a.11) close to and connected to the air inlet (1.2), and a second groove body (1a.12) away from the air inlet (1.2); The second air inlet (1a.2) and the first air inlet (1a.3) are both arranged on the groove wall of the second groove body (1a.12); Furthermore, the flow stabilizing plate (1b) is provided with a plurality of air inlet holes (1b.1) for allowing air to flow from the second trough body (1a.12) to the first trough body (1a.11).

7. The combustion system according to claim 6, characterized in that: Both ends of the flow stabilizing plate (1b) have: an abutment portion (1b.2) protruding toward the bottom surface of the air inlet groove (1a.1); The abutment portion (1b.2) is arranged to match the bottom surface and the slot opening of the air inlet slot (1a.1) so that: When the notch of the air inlet groove (1a.1) faces upward, the two abutting portions (1b.2) are abutted against the bottom surface of the air inlet groove (1a.1), so that the flow stabilizing plate (1b) is placed in the air inlet groove (1a.1) in a horizontal state.

8. The combustion system according to claim 2, characterized in that: The smoke exhaust channel (3.1), the first smoke collecting chamber (2a.1) and the second smoke collecting chamber (2b.1) together form: a smoke flow channel for smoke circulation; The driving device (6) is arranged outside the flue gas flow duct.

9. The combustion system according to any one of claims 1 to 8, characterized in that: A return fan (9) is provided in the return pipe (4), and is configured to provide power to the smoke in the return pipe (4) to drive it to flow from the return port (2.13) to the air inlet (1.2).

10. Gas water heater, characterized by: A combustion system comprising any one of claims 1 to 9.

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