Combustion system and gas water heater

Abstract

The present invention relates to the technical field of water heaters, and more specifically to a combustion system and a gas water heater, wherein the combustion system comprises: a burner, a smoke collecting hood placed above the burner and having a smoke collecting chamber; the smoke outlet of the burner is connected to the smoke inlet of the smoke collecting chamber through a smoke exhaust channel, and the smoke collecting hood is provided with: a smoke exhaust port and a return port connected to the smoke collecting chamber; the return port is connected to a return pipe, which is configured to: guide the smoke in the return port to the air inlet of the burner; the smoke collecting chamber is provided with: a guide plate that guides the smoke entering the smoke collecting chamber to the return port; the guide plate is rotatably installed in the smoke collecting chamber, and the amount of smoke guided to the return port can be changed by rotating the guide plate to different angles. A combustion system capable of regulating the amount of smoke reflux is formed, so that combustion work can be performed more efficiently and stably under different environments.

Description

Technical Field

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

[0002] In the current market, "high energy efficiency" and "low environmental protection" have become the focus of consumers. Based on this, gas water heaters with flue gas recirculation have appeared in the prior art; that is, by improving the combustion system in the gas water heater, part of the flue gas generated by its combustion can be recirculated and re-combusted.

[0003] The combustion system with flue gas recirculation in the existing gas water heater mainly guides part of the flue gas generated by the combustion in the combustion system to the air inlet of the burner in the combustion system by setting 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 the 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 recirculation volume of the flue gas. 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) for operation, it is easy to directly cause the recirculation volume of the flue gas to be too high or too low, thereby affecting the combustion efficiency and making it impossible to carry out the combustion work more efficiently and stably. Summary of the invention

[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 perform combustion work more efficiently and stably under different environments.

[0006] A second object of the present invention is to provide a gas water heater having the above combustion system.

[0007] The technical solutions of the present invention are as follows:

[0008] Combustion system, including:

[0009] A burner, and a smoke collecting hood placed above the burner and having a smoke collecting cavity;

[0010] The smoke outlet of the burner is connected to the smoke inlet of the smoke collecting chamber through a smoke exhaust passage, and the smoke collecting hood is provided with: a smoke exhaust outlet and a return outlet connected to the smoke collecting chamber;

[0011] The return port is connected to a return pipe, which is configured to: guide the smoke in the return port to the air inlet of the burner;

[0012] A guide plate is provided in the smoke collecting chamber to guide the smoke entering the smoke collecting chamber to the return port;

[0013] The guide plate is rotatably installed in the smoke collecting chamber, and the amount of smoke directed to the return port can be changed by rotating the guide plate to different angles.

[0014] As a further preferred solution, the guide plate is connected to a driving device for driving the guide plate to rotate, so as to:

[0015] The guide plate is driven to rotate at different angles by a driving device to change the amount of smoke directed to the return port.

[0016] As a further preferred solution, the smoke hood comprises: a smoke hood body having a smoke inlet, and a smoke exhaust pipe connected to the smoke hood body;

[0017] The first smoke collecting chamber in the smoke collecting hood body and the second smoke collecting chamber in the smoke exhaust pipe are connected to form a smoke collecting chamber together;

[0018] The smoke exhaust port is arranged on the smoke exhaust pipe, the return port is arranged on the smoke collecting hood body, and the guide plate is rotatably installed in the first smoke collecting chamber.

[0019] As a further preferred solution, in the direction from the smoke inlet to the smoke exhaust pipe, the guide plate is arranged opposite to a partial area of ​​the second smoke collecting chamber, and a baffle for blocking smoke flow is arranged in the partial area of ​​the second smoke collecting chamber.

[0020] As a further preferred solution, the smoke hood comprises: a smoke hood body having a smoke inlet, and a smoke exhaust pipe connected to the smoke hood body;

[0021] The first smoke collecting chamber in the smoke collecting hood body and the second smoke collecting chamber in the smoke exhaust pipe are connected to form a smoke collecting chamber together;

[0022] The smoke exhaust port and the return port are both arranged on the smoke exhaust pipe, and the guide plate is rotatably installed in the second smoke collecting chamber.

[0023] As a further preferred solution, a baffle is provided in the first smoke collecting chamber, and the baffle covers the second smoke collecting chamber in the direction from the smoke inlet to the smoke exhaust pipe;

[0024] The edge of the baffle plate is spaced apart from the side wall of the first smoke collecting chamber to form: a channel for smoke to flow from the first smoke collecting chamber to the second smoke collecting chamber;

[0025] A plurality of guide holes are arranged on the baffle plate, and the guide holes allow smoke to flow from the first smoke collecting chamber to the second smoke collecting chamber.

[0026] As a further preferred solution, the burner is provided with: an air inlet hood for covering the air inlet;

[0027] The air intake cover is provided with an air intake groove, and the notch of the air intake groove is connected with the air intake port;

[0028] The air intake hood is also 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;

[0029] One end of the reflux pipe away from the reflux port is connected to the second air inlet port and is connected to the air inlet groove through the second air inlet port.

[0030] As a further preferred solution, the second air inlet is arranged on: a side wall of the air inlet groove that is not opposite to the air inlet;

[0031] 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.

[0032] 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;

[0033] The second air inlet and the first air inlet are both arranged on the groove wall of the second groove body;

[0034] The flow stabilizing plate is provided with a plurality of air inlet holes for supplying air flow from the second slot body to the first slot body.

[0035] 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.

[0036] A gas water heater comprises a combustion system in any of the above solutions.

[0037] The main beneficial effects of the above technical solution are:

[0038] 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 smoke reflux amount); the smoke reflux amount can be adaptively regulated according to different environmental requirements, so that the combustion system can perform combustion work more efficiently and stably with a suitable smoke reflux amount in any environment.

[0039] Further or more detailed beneficial effects will be described in detail in conjunction with specific examples in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The present invention will be further described below in conjunction with the accompanying drawings:

[0041] Figure 1 This is a schematic diagram of the overall structure of the combustion system.

[0042] Figure 2 This is a schematic diagram of the smoke hood structure when the return port is arranged on the smoke hood body.

[0043] Figure 3The figure is a schematic diagram of smoke diversion when the guide plate is arranged in the first smoke collecting chamber.

[0044] Figure 4 Schematic diagram of the installation of the spoiler.

[0045] Figure 5 This is a schematic diagram of the smoke hood structure when the return port is set on the smoke exhaust pipe.

[0046] Figure 6 The figure is a schematic diagram of smoke diversion when the guide plate is arranged in the second smoke collecting chamber.

[0047] Figure 7 Schematic diagram of the installation of the baffle.

[0048] Figure 8 This is a schematic diagram of the installation of the air intake hood.

[0049] Fig. 9 This is a schematic diagram of the flow stabilizer installation.

[0050] Fig.10 Schematic diagram of the return pipe structure.

[0051] 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 channel 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, driving device 6, baffle plate 7, baffle plate 8, guide hole 8.1, bending part 8.2, return fan 9, impeller 9.1, driving member 9.2, fan 10. DETAILED DESCRIPTION

[0052] The present invention is specifically described below with reference to the embodiments:

[0053] Embodiment 1:

[0054] 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.

[0055] As attached Figure 1 To Attachment Fig.10As shown in the figure, the combustion system mainly includes a burner 1 for receiving gas and igniting the gas, a smoke hood 2 for receiving high-temperature flue gas and exhausting the high-temperature flue gas, and a smoke exhaust channel 3.1 for transmitting the high-temperature flue gas generated by the burner 1 to the smoke hood 2.

[0056] 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 to enter, the side of the burner 1 has a gas inlet for gas to enter, and the top of the burner 1 is provided with a smoke exhaust port 2.12 for smoke to be discharged. The air inlet 1.2 is connected to the smoke exhaust port 2.12 through the air flow channel inside the burner 1, and the gas inlet is connected to the smoke exhaust port 2.12 through the gas flow channel inside the burner 1, and an ignition device is provided at the smoke exhaust port 2.12. When air enters from the air inlet 1.2 and flows to the smoke exhaust port 2.12, and when gas enters from the gas inlet and flows to the smoke exhaust port 2.12, the ignition device ignites the gas to burn, forming high-temperature smoke, which is discharged upward from the smoke exhaust port 2.12.

[0057] The smoke collecting hood 2 is placed above the burner 1, and a smoke collecting chamber 2.1 is formed in the form of a hollow cavity inside the smoke collecting hood 2. A smoke inlet 2.11 is provided at the bottom of the smoke collecting hood 2, which is connected to the smoke collecting chamber 2.1 for smoke to enter the smoke collecting chamber 2.1. The smoke inlet 2.11 is preferably arranged in a vertically aligned position with the smoke exhaust port 2.12. The smoke collecting hood 2 is provided with a smoke exhaust port 2.12, which is connected to the smoke collecting chamber 2.1 and is used to exhaust smoke from the smoke collecting chamber 2.1 to the outside.

[0058] At the same time, the lower end of the smoke exhaust channel 3.1 is connected to and communicated with the smoke exhaust port 2.12 of the burner 1, and the upper end is connected to and communicated with the smoke inlet 2.11 of the smoke collecting hood 2. The smoke generated in the burner 1 can flow upward to the smoke collecting chamber 2.1 through the smoke exhaust channel 3.1 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 collecting hood 2, and the smoke exhaust channel 3.1 is a channel structure formed inside the heat exchanger 3 for the smoke to flow.

[0059] Furthermore, in order to be able to reflux part of the flue gas for reuse to improve the combustion efficiency.

[0060] In this embodiment, as shown in the attached Figure 1 As shown in FIG. 1 , 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.

[0061] That is, one end of the return pipe 4 is connected to and connected with the return port 2.13, and the other end is arranged close to the air inlet 1.2 of the burner 1, and preferably arranged in a counterposition with the air inlet 1.2. After the smoke enters the smoke collecting chamber 2.1 as described above, part of the smoke can flow from the return port 2.13 to the air inlet 1.2 through the return pipe 4. At this time, the 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 flows to the air inlet 1.2, it will mix with the fresh air and enter the burner 1 for combustion, so as to realize the reflux and reuse of the smoke and improve the overall combustion efficiency.

[0062] Furthermore, in order to allow air to enter the burner 1 better and smoke to be discharged better and faster, a fan 10 may be provided in the combustion system, which is 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.

[0063] In this embodiment, the smoke exhaust passage 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 flow; the fan 10 can be arranged in the smoke flow passage. Figure 1 As shown in FIG. 1 , the fan 10 is preferably disposed at the air inlet 1.2 and is configured to blow external air into the burner 1 from the air inlet 1.2.

[0064] However, the recirculation 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) for operation, it is easy to directly cause the recirculation 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.

[0065] Based on this, as attached Figure 1 To Attachment Figure 6 As shown in FIG. 1 , 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 port 2.13. The guide plate 5 is rotatably installed in the smoke collecting chamber 2.1. At this time, by rotating the guide plate 5 to different angles, the amount of smoke guided to the return port 2.13 can be changed, and the amount of smoke discharged can also be adjusted and changed.

[0066] The guide plate 5 can be rotatably installed in the smoke collecting chamber 2.1 through a commonly used rotating connection structure (such as 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.

[0067] Alternatively, preferably, the guide plate 5 may 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 to change the amount of smoke directed to the return port 2.13.

[0068] Specifically, in one form:

[0069] As attached Figure 2 To Attachment Figure 3 As shown, the smoke collecting hood 2 comprises: a smoke collecting 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 collecting hood body 2a.

[0070] Among them, as attached Figure 3 As shown in the figure, a first smoke collecting chamber 2a.1 is formed in the smoke collecting hood body 2a in a hollow structure, and a second smoke collecting chamber 2b.1 is formed in the smoke exhaust pipe 2b in a hollow structure. A smoke inlet 2.11 at the bottom of the smoke collecting hood body 2a is connected to the first smoke collecting chamber 2a.1, and the first smoke collecting chamber 2a.1 is connected to the second smoke collecting chamber 2b.1 to form a smoke collecting chamber 2.1 together.

[0071] The smoke exhaust port 2.12 is arranged on the smoke exhaust pipe 2b, the return port 2.13 is arranged on the side wall of the smoke hood body 2a, and the guide plate 5 is rotatably installed in the first smoke collecting chamber 2a.1. Specifically, the guide plate 5 is placed in the first smoke collecting chamber 2a.1, and the two ends of the guide plate 5 are respectively rotatably connected to the smoke collecting chamber 2a; 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 avoid the influence of smoke on the driving device 6, the driving device 6 is arranged outside the smoke flow passage. At this time, the driving device 6 is preferably fixed to the outer surface of the smoke collecting chamber 2a, and one end of the guide plate 5 passes through the smoke collecting chamber 2a and is transmission-connected to the driving device 6, so that the driving device 6 can drive the guide plate 5 to rotate.

[0072] At this time, if the attached Figure 3 As shown in A and B, the driving device 6 drives the guide plate 5 to rotate to different angles, so as to change the amount of smoke (i.e., the amount of smoke reflux) directed from the first smoke collecting chamber 2a.1 to the reflux port 2.13. The amount of smoke reflux can be adaptively regulated according to different environmental requirements, so that the combustion system can perform combustion work more efficiently and stably with a suitable amount of smoke reflux in any environment.

[0073] Furthermore, the second smoke collecting chamber 2b.1 in the smoke exhaust pipe 2b serves as a smoke exhaust channel. When smoke is exhausted, the area in the first smoke collecting chamber 2a.1 opposite to the second smoke collecting chamber 2b.1 is the area with the fastest smoke flow velocity in the first smoke collecting chamber 2a.1. Figure 2 To Attachment Figure 3 As shown in the figure, in this embodiment, in the direction from the smoke inlet 2.11 to the smoke exhaust pipe 2b, the guide plate 5 is arranged opposite to a part of the second smoke collecting chamber 2b.1. In this way, by driving the guide plate 5 to rotate, the smoke with a faster flow rate can be quickly guided to change the size of the smoke reflux amount more efficiently and quickly.

[0074] At this time, the fast-flowing smoke often easily impacts the guide plate 5, affecting its stability. Figure 4 As shown in the figure, a baffle plate 7 for blocking the flow of smoke may also be provided in a partial area of ​​the second smoke collecting chamber 2b.1 that is arranged opposite to the baffle plate 5; the baffle plate 7 is preferably fixed to the smoke exhaust pipe 2b by, for example, screws. By providing the baffle plate 7, the flow velocity of smoke in the area where the baffle plate 5 is located can be slowed down, and the impact effect of smoke on the baffle plate 5 can be slowed down, so that the baffle plate 5 can stably rotate or stably stop at a certain angle to maintain a stable smoke reflux amount.

[0075] In another form:

[0076] As attached Figure 5 To Attachment Figure 6 As shown, the smoke collecting hood 2 comprises: a smoke collecting 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 collecting hood body 2a.

[0077] Among them, as attached Figure 3 As shown in the figure, a first smoke collecting chamber 2a.1 is formed in the smoke collecting hood body 2a in a hollow structure, and a second smoke collecting chamber 2b.1 is formed in the smoke exhaust pipe 2b in a hollow structure. A smoke inlet 2.11 at the bottom of the smoke collecting hood body 2a is connected to the first smoke collecting chamber 2a.1, and the first smoke collecting chamber 2a.1 is connected to the second smoke collecting chamber 2b.1 to form a smoke collecting chamber 2.1 together.

[0078] As attached Figure 6 As shown, the smoke exhaust port 2.12 and the return port 2.13 are both arranged in the smoke exhaust pipe 2b. Specifically, in this embodiment, the smoke exhaust port 2.12 is preferably arranged at the top of the smoke exhaust pipe 2b and communicated with the second smoke collecting chamber 2b.1 to facilitate the smoke to rise and discharge; depending on whether the return pipe 4 is inserted into the smoke exhaust pipe 2b, the return port 2.13 can be arranged on the side wall of the smoke exhaust pipe 2b and communicated with the second smoke collecting chamber 2b.1; or, the return port 2.13 can also be arranged in the smoke exhaust pipe 2b and communicated with the second smoke collecting chamber 2b.1 (when one end of the return pipe 4 is inserted into the smoke exhaust pipe 2b). And the guide plate 5 is rotatably installed in the second smoke collecting chamber 2b.1.

[0079] Specifically, the guide plate 5 is preferably located relative to the return port 2.13 (for example, Figure 6In the figure, the guide plate 5 is arranged 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 respectively; 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 avoid the influence of smoke on the driving device 6, the driving device 6 is arranged outside the smoke flow passage. At this time, the driving 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 driving device 6, so that the driving device 6 can drive the guide plate 5 to rotate.

[0080] At this time, if the attached Figure 6 As shown in C and D, the driving device 6 drives the guide plate 5 to rotate to different angles, so as to change the amount of smoke (i.e., the amount of smoke reflux) directed from the second smoke collecting chamber 2b.1 to the reflux port 2.13. The amount of smoke reflux can be adaptively regulated according to different environmental requirements, so that the combustion system can perform combustion work more efficiently and stably with a suitable amount of smoke reflux in any environment.

[0081] 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.

[0082] At this time, in this embodiment, as shown in the attached Figure 7As shown, a baffle plate 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 plate 8 is spaced apart from the side wall 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; and the baffle plate 8 is 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 plate 8 in the first smoke collecting chamber 2a.1, while trying not to cause excessive obstruction to the discharge of smoke to ensure smooth discharge of smoke, the smoke flow velocity in the area where the guide plate 5 is located can be slowed down, and the impact effect of smoke on the guide plate 5 can be slowed down, so that the guide plate 5 can stably rotate or stably stop at a certain angle to maintain a stable smoke reflux amount. At the same time, by setting the baffle 8, the flow rate of the smoke in the area of ​​the smoke exhaust channel 3.1 opposite to the smoke exhaust pipe 2b and where the smoke flows at a high speed can be reduced, so that it is close to the flow rate of the smoke in other areas of the smoke exhaust channel 3.1 that are not opposite to the smoke exhaust pipe 2b, thereby achieving the uniformity of the overall flow rate of the smoke exhaust channel 3.1, ensuring that the overall flow rate of the smoke 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.

[0083] In this embodiment, a bending portion 8.2 is provided on the edge of the baffle plate 8, and the baffle plate 8 is installed by fixing the bending portion 8.2 to the smoke hood body 2a by screws.

[0084] Based on any of the above options.

[0085] As attached Figure 8 To Attachment Fig. 9 As shown in the figure, in this embodiment, an air intake cover 1a may be further 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 intake port 1.2.

[0086] As attached Figure 8 As shown in the figure, the air intake cover 1a is also provided with: an air intake groove 1a.1 opening toward 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.

[0087] As attached Figure 8 To Attachment Fig. 9As shown, the air inlet cover 1a is provided with: a second air inlet 1a.2 connected to the air inlet groove 1a.1, and a first air inlet 1a.3 connected to the air inlet groove 1a.1 and for air to enter. One end of the return pipe 4 away from the return 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.

[0088] At this time, the first air inlet 1a.3 serves as the air inlet for external air to enter. The fan 10 is preferably arranged at the first air inlet 1a.3 and configured to blow external air from the first air inlet 1a.3 into the air inlet slot 1a.1 and into the air inlet 1.2 through the air inlet slot 1a.1.

[0089] Realization: Fresh air and flue gas returning from the return pipe 4 can be pre-mixed in the air inlet slot 1a.1 first, and then enter the burner 1 from the air inlet port 1.2 for combustion, so as to better improve the combustion effect.

[0090] In order to better achieve the mixing of fresh air and smoke returning from the return pipe 4 in the air inlet slot 1a.1, improve the uniformity of the mixing and improve the combustion effect. In this embodiment, the first air inlet 1a.3 is preferably arranged on the side wall of the air inlet slot 1a.1 not opposite to the air inlet 1.2; and the second air inlet 1a.2 may also be preferably arranged on the side wall of the air inlet slot 1a.1 not opposite to the air inlet 1.2.

[0091] In this way, neither air nor recirculated smoke 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 recirculated smoke have more time to mix.

[0092] 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.

[0093] Furthermore, as attached Figure 8 To Attachment Fig. 9 In the embodiment, a flow stabilizing plate 1b may be 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; and the flow stabilizing plate 1b is provided with a plurality of air inlet holes 1b.1 for air flow from the second groove body 1a.12 to the first groove body 1a.11.

[0094] 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 recirculated 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, it 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 the recirculated 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 a number of air inlet holes 1b.1. During the flow process, the fresh air and the recirculated flue gas will be dispersedly flowed 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.

[0095] 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, so as to improve 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 further improving the uniformity and stability of subsequent combustion.

[0096] On the basis of the above, as attached Fig. 9 As shown, both ends of the flow stabilizer 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 notch of the air inlet groove 1a.1, so that: when the notch 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 the two abutment portions 1b.2 against the bottom surface of the air inlet groove 1a.1.

[0097] In this way, not only can the installation stability 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 airflow can enter the first slot body 1a.11 and enter the air inlet port 1.2 more evenly from the second slot body 1a.12.

[0098] Furthermore, the flow stabilizer plate 1b can be detachably fixed to the air intake cover 1a by means of fasteners such as screws, so as to improve the stability of the flow stabilizer plate 1b and make it easy to remove and replace the flow stabilizer plate 1b.

[0099] Moreover, the edge of the flow stabilizer plate 1b can be bent to form a flange structure to improve the structural strength of the flow stabilizer plate 1b so that it can withstand the impact of fresh air and reflowing smoke.

[0100] 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 refluxed smoke is easily retained in the reflux pipe 4, resulting in the overall flow of the smoke being blocked.

[0101] Therefore, on the basis of the above, if Figure 1 As shown in FIG. 1 , in this embodiment, a return fan 9 may be further provided in the return pipe 4 , which 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.

[0102] Specifically, in this embodiment, the return fan 9 includes: an impeller 9.1 placed in the return pipe 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), the driving member 9.2 is transmission-connected to the impeller 9.1, and is used to drive the impeller 9.1 to rotate.

[0103] The driving member 9.2 can be electrically connected to the control main board of the combustion system. When the combustion system is performing combustion operation, the control main board synchronously controls the driving member 9.2 to start, so as to drive the impeller 9.1 to rotate, and provide continuous and stable power to the flue gas in the return pipe 4 to drive it to flow from the return port 2.13 to the air inlet 1.2.

[0104] Of course, the driving member 9.2 can also be configured to increase the speed at which the driving member 9.2 drives the impeller 9.1 to rotate as the combustion temperature set by the control mainboard increases, so as to better adapt to the different degrees of combustion state of the combustion system and ensure that the smoke can always flow stably and smoothly in the return pipe 4.

[0105] In order to prevent the flue gas from corroding the driving member 9.2, the driving member 9.2 is preferably placed outside the return pipe 4. Fig.10 As shown in FIG. 1 , the driving member 9.2 is fixedly connected 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 drivingly connected to the driving member 9.2.

[0106] Further, in order to facilitate the overall maintenance or replacement of the return fan 9, in this embodiment, as shown in the attached Fig.10 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 connecting 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.

[0107] Embodiment 2:

[0108] A gas water heater comprises a water heater shell, a water supply pipeline for circulating water, and a combustion system as described in any scheme in the first embodiment.

[0109] The combustion system is placed in the water heater housing, 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.

[0110] The above description is only a preferred embodiment of the present invention and does not limit the scope of the present invention. In addition, the terms "vertical", "horizontal", "front", "rear" and the like mentioned in the embodiments of the present invention indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should be further explained that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like in the description should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The present invention will be described in detail with reference to the drawings and in combination with the embodiments.

[0111] Although the 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 present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A combustion system, characterized in that: include: A burner (1), and a smoke collecting hood (2) disposed above the burner (1) and having a smoke collecting chamber (2.1); The smoke outlet (1.1) of the burner (1) is connected to the smoke inlet (2.11) of the smoke collecting chamber (2.1) via a smoke exhaust passage (3.1), and the smoke collecting hood (2) is provided with: a smoke exhaust port (2.12) and a return port (2.13) connected to the smoke collecting chamber (2.1); 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); The smoke collecting chamber (2.1) is provided with a guide plate (5) which guides the smoke entering the smoke collecting chamber (2.1) to the return port (2.13); The guide plate (5) is rotatably mounted in the smoke collecting chamber (2.1), and the amount of smoke directed to the return port (2.13) can be changed by rotating the guide plate (5) at different angles; The smoke collecting hood (2) comprises: a smoke collecting hood body (2a) having the smoke inlet (2.11), and a smoke exhaust pipe (2b) connected to the smoke collecting hood body (2a); The first smoke collecting chamber (2a.1) in the smoke collecting hood body (2a) and the second smoke collecting chamber (2b.1) in the smoke exhaust pipe (2b) are connected to each other to form the smoke collecting chamber (2.1); The smoke exhaust port (2.12) is arranged on the smoke exhaust pipe (2b), the return port (2.13) is arranged on the smoke collecting hood body (2a), and the guide plate (5) is rotatably mounted in the first smoke collecting chamber (2a.1); In the direction from the smoke inlet (2.11) to the smoke exhaust pipe (2b), the guide plate (5) and a partial area of ​​the second smoke collecting chamber (2b.1) are arranged opposite to each other, and a baffle plate (7) for blocking the flow of smoke is arranged in the partial area of ​​the second smoke collecting chamber (2b.1).

2. The combustion system according to claim 1, characterized in that: The guide plate (5) is drivingly connected to a driving device (6) for driving the guide plate 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 to the return 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 further provided with: a second air intake port (1a.2) connected to the air intake slot (1a.1), and a first air intake port (1a.3) connected to the air intake slot (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 port (1a.2), and is connected to the air inlet groove (1a.1) through the second air inlet port (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 4, characterized in that: The air inlet groove (1a.1) is provided with a flow stabilizing plate (1b), 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 flow to flow from the second slot body (1a.12) to the first slot body (1a.11).

6. The combustion system according to any one of claims 1 to 5, characterized in that: The return pipe (4) is provided with a return fan (9), which 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).

7. Gas water heater, characterized in that: A combustion system comprising any one of claims 1 to 6.

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