Premixed rich / lean burner after fan

Abstract

The present invention relates to a post-fan premixed rich-lean burner, which relates to the field of gas burners. It comprises a fan and a combustion box body, the combustion box body comprises an air intake chamber, a gas injection chamber, a flow equalizing chamber, a mixing chamber and a combustion panel, the fan and the air intake chamber are connected; the gas injection chamber and the air intake chamber are connected, a gas nozzle is provided on one side of the gas injection chamber for injecting gas, the gas injection chamber is divided into a gas injection chamber for rich combustion and a gas injection chamber for lean combustion which are not connected to each other and have different air-fuel ratios, the other side of the gas injection chamber is connected to the flow equalizing chamber through a deflection chamber, the deflection chamber, the flow equalizing chamber and the mixing chamber are also divided into chambers for rich combustion, the gas injection chamber, the deflection chamber, the flow equalizing chamber and the mixing chamber for the same combustion mode are correspondingly connected; the mixing chamber supplies gas to the rich combustion flame hole and the lean combustion flame hole on the combustion panel to realize rich-lean combustion.

Description

Technical Field

[0001] The invention relates to a rich-lean burner, in particular to a high-power rich-lean burner. Background Art

[0002] Designing a gas burner for lean-to-dense combustion helps improve combustion efficiency and reduce nitrogen oxide emissions. Currently, the market primarily uses fire grate burners to achieve lean-to-dense combustion. Burners that achieve lean-to-dense combustion through grate airflow design have been widely used in water heaters, particularly household gas instantaneous water heaters, gas heating water boilers, and steam heat source units. When burner power needs to be increased, the number of fire grate burners often needs to be increased, significantly increasing manufacturing costs. Therefore, developing high-power lean-to-dense burners with lower manufacturing costs has become a trend in the burner industry. Summary of the Invention

[0003] The purpose of the present invention is to provide a rich-lean burner, which can not only realize rich-lean combustion, but also has lower cost and lighter material than fire-grate type rich-lean burners of the same level of combustion power, and is easier to promote to the market.

[0004] The technical solution adopted by the present invention to solve the above-mentioned problems is: a post-blower premixed rich-lean burner, comprising a blower and a combustion box, the combustion box comprising an air intake chamber, a gas injection chamber, a flow equalizing chamber, a mixing chamber, and a combustion panel, the blower and the air intake chamber are connected for blowing air into the air intake chamber; the gas injection chamber and the air intake chamber are connected so that air enters the gas injection chamber, a gas nozzle is provided on one side of the gas injection chamber for injecting gas into the gas injection chamber, the gas injection chamber is divided into a gas injection chamber for rich combustion and a gas injection chamber for lean combustion which are not connected to each other and have different air-fuel ratios, a deflection chamber is provided on the other side of the gas injection chamber and is connected to the flow equalizing chamber through the deflection chamber. The chambers are connected, the deflection chamber is also divided into a deflection chamber for rich combustion and a deflection chamber for lean combustion, the flow equalizing chamber is also divided into a flow equalizing chamber for rich combustion and a flow equalizing chamber for lean combustion, the gas injection chamber, deflection chamber and flow equalizing chamber used for the same combustion mode are correspondingly connected; the mixing chamber is divided into a mixing chamber for rich combustion and a mixing chamber for lean combustion, the mixing chamber and flow equalizing chamber used for the same combustion mode are correspondingly connected, the combustion panel is arranged on the mixing chamber, and rich combustion flame holes and lean combustion flame holes are arranged on the surface, the rich combustion flame holes are connected to the mixing chamber for rich combustion, and the lean combustion flame holes are connected to the mixing chamber for lean combustion, so that rich and lean combustion is realized on the combustion panel.

[0005] As one of the embodiments of the present invention, a gas inlet chamber is provided on the combustion box body. The gas inlet chamber is connected to a gas source and is connected to the gas nozzle for delivering gas to the gas nozzle.

[0006] As one embodiment of the present invention, the air intake chamber, gas injection chamber, and flow equalizing chamber are arranged sequentially from bottom to top. The air intake chamber and the gas injection chamber are connected on one side, and the gas injection chamber and the flow equalizing chamber are connected on the opposite side through the baffle chamber. The gas injection chamber has an airflow cross-section that gradually decreases and then increases along the airflow direction, while the flow equalizing chamber has an airflow cross-section that gradually decreases along the airflow direction. The baffle chamber is provided with a plurality of spaced baffles that divide the baffle chamber into a plurality of baffle gaps, and the airflow is diverted through the baffle gaps, thereby facilitating sufficient mixing of the gas and air.

[0007] Furthermore, the gas injection chamber and the flow equalizing chamber are separated by guide plates at the top and bottom, and the guide plates are arranged obliquely to achieve the airflow cross-sectional shaping of the gas injection chamber and the flow equalizing chamber.

[0008] As one of the embodiments of the present invention, there may be multiple mixing chambers, through which the mixed gas for rich combustion and the mixed gas for lean combustion are mixed continuously multiple times, and the mixing chambers for rich combustion and the mixing chambers for lean combustion of the multiple mixing chambers are correspondingly connected.

[0009] As one of the embodiments of the present invention, the mixing chamber is located above the equalizing flow chamber, and is separated from the upper and lower parts by a partition. The partition is provided with an air inlet hole, and the equalizing flow chambers used for the same combustion mode are respectively connected to the corresponding mixing chamber through the air inlet hole.

[0010] In the present invention, the rich and lean flame holes on the combustion panel are evenly arranged, so the mixing chamber for rich combustion and the mixing chamber for lean combustion must evenly supply air to the combustion panel. As one embodiment of the present invention, the mixing chamber is provided with a plurality of independent small mixing chambers, which are evenly distributed within the mixing chamber. The small mixing chambers communicate with the mixing chamber peripheral wall and the gaps between adjacent small mixing chambers to form an enclosure for the small mixing chambers. The small mixing chambers and the surrounding gaps serve as the mixing chamber for lean combustion and the mixing chamber for rich combustion, respectively.

[0011] The rich burn flame hole and the lean burn flame hole are combined to form a rich-lean burn unit. As one embodiment of the present invention, the diameter of the rich burn flame hole is smaller than that of the lean burn flame hole, and one or more rich burn flame holes are distributed around each lean burn flame hole.

[0012] Compared with the existing technology, the advantages of the present invention are: it adopts a combustion box structure and achieves rich-lean combustion by designing the air chamber inside the combustion box. Compared with burners composed of fire grate, the air chamber of the combustion box of the present invention is larger in volume, the flow rate of mixed gas is greater, and the gas and air can be mixed inside the box, ultimately achieving high-power combustion. At the same combustion power, the burner of the present application uses less materials, is smaller in size, and has a lower cost, making it more suitable for popularization and application.

[0013] Furthermore, the present invention uses a mixing chamber for rich combustion to supply air to the rich flame holes, while a mixing chamber for lean combustion supplies air to the lean flame holes. This allows for a uniform and stable air supply to both the rich and lean flame holes across the entire combustion panel, ensuring uniform combustion across the panel. Conventional fire-grate burners, on the other hand, each fire bar has its own independent airflow, making it difficult to achieve uniform airflow between the fire bars, often resulting in uneven surface combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A perspective view of a rich-lean burner according to an embodiment of the present invention;

[0015] Figure 2 A top view of a rich-lean burner according to an embodiment of the present invention;

[0016] Figure 3 for Figure 2 Middle EE cross-sectional view;

[0017] Figure 4 It is a front view of a rich-lean burner in an embodiment of the present invention;

[0018] Figure 5 for Figure 4 Middle FF cross-sectional view;

[0019] Figure 6 for Figure 4 Middle GG section view;

[0020] Figure 7 for Figure 4 Middle HH section view;

[0021] Figure 8 for Figure 3 Middle JJ cross-sectional view;

[0022] Figure 9 for Figure 3 Middle KK section view;

[0023] Figure 10 This is a gas trend chart for light combustion in an embodiment of the present invention;

[0024] Figure 11 for Figure 10Middle GG section view;

[0025] Figure 12 This is a gas trend diagram of rich combustion in an embodiment of the present invention;

[0026] Figure 13 for Figure 12 Middle GG section view;

[0027] Figure 14 It is a structural diagram of the combustion panel;

[0028] In the figure, there are fan 1, air intake chamber 2, gas injection chamber 3, deflection chamber 4, flow equalizing chamber 5, mixing chamber 6, combustion panel 7, gas intake chamber 8, gas nozzle 9, transverse partition 10, guide plate 11, deflection plate 12, partition 13, air intake hole 14, gas injection chamber 301 for lean combustion, gas injection chamber 302 for rich combustion, deflection chamber 401 for lean combustion, deflection chamber 402 for rich combustion, flow equalizing chamber 501 for lean combustion, flow equalizing chamber 502 for rich combustion, mixing chamber 601 for lean combustion, mixing chamber 602 for rich combustion, rich combustion flame hole 15, lean combustion flame hole 16. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below with reference to the accompanying drawings. The embodiments described are illustrative and intended to explain the present invention, but are not to be construed as limiting the present invention. The directions "up, down, left, right, front, and back" in this embodiment are based on the accompanying drawings to facilitate a better understanding of the embodiments, but should not be construed as limiting the scope of protection of the present invention.

[0030] The post-blower premixed burner in this embodiment includes a blower 1 and a combustion box. The combustion box includes an air intake chamber 2, a gas injection chamber 3, a flow equalization chamber 5, a mixing chamber 6 and a combustion panel 7 formed in sequence from bottom to top. The blower 1 is arranged at the bottom of the combustion box and is connected to the air intake chamber 2 for blowing air into the air intake chamber 2. The blower 1 is biased to the right side of the air intake chamber 2 so that air can flow throughout the entire air intake chamber 2.

[0031] The gas injection chamber 3 and the air intake chamber 2 are connected on the left side, allowing air to flow upward into the gas injection chamber 3. A gas nozzle 9 is provided on the left side of the gas injection chamber 3 for injecting gas into the gas injection chamber 3 and also for guiding air into the gas injection chamber 3. A gas intake chamber 8 is provided on the combustion chamber body, connected to an external gas source and connected to the gas nozzle 9. The gas injection chamber 3 is divided into two independent gas injection chambers 302 for rich combustion and 301 for lean combustion, each with a different air-fuel ratio. Two transverse partitions 10 are provided within the gas injection chamber 3. The two transverse partitions 10 respectively separate two long chambers on the front and rear inner sides of the gas injection chamber, which serve as the injection chamber 302 for rich combustion. The gas injection chamber 301 for lean combustion is located between the two transverse partitions 10. The gas injection chamber 301 for lean combustion and the two gas injection chambers 302 for rich combustion are arranged in parallel.

[0032] The gas injection chamber 3 and the flow equalizing chamber 5 are separated from each other by a guide plate 11, which is arranged at an angle. The gas injection chamber 3 and the flow equalizing chamber 5 are connected on the right side through a deflection chamber 4. The gas injection chamber 3 gradually decreases and then gradually increases along the airflow direction (refer to the direction from left to right in the figure). The airflow cross-section of the flow equalizing chamber 5 gradually decreases along the airflow direction (refer to the direction from right to left in the figure). A number of spaced-apart deflection plates 12 are arranged in the deflection chamber 4. The deflection plates 12 separate the deflection chamber 4 into a number of deflection gaps. The airflow coming out of the gas injection chamber is diverted through a number of deflection gaps and then mixed into the flow equalizing chamber.

[0033] The deflection chamber 4 is also divided by the two transverse partitions 10 into a deflection chamber 402 for rich combustion and a deflection chamber 401 for lean combustion. The equalizing flow chamber 5 is also divided by the two transverse partitions 10 into an equalizing flow chamber 502 for rich combustion and an equalizing flow chamber 501 for lean combustion. The gas injection chamber, deflection chamber and equalizing flow chamber used for the same combustion mode are correspondingly connected.

[0034] The mixing chamber 6 is located above the equalizing chamber 5 and is separated from the upper and lower parts by a partition 13. The mixing chamber 6 is also designed to have a mixing chamber 602 for rich combustion and a mixing chamber 601 for lean combustion. The partition 13 is provided with an air inlet 14. The equalizing chamber 5 and the mixing chamber 6 for the same combustion mode are connected to each other through the air inlet 14. In order to achieve uniform air supply to the combustion panel 7, the mixing chamber 602 for rich combustion and the mixing chamber 601 for lean combustion should be evenly distributed in the mixing chamber. A number of independent small mixing chambers are provided in the mixing chamber. The small mixing chambers are evenly distributed in the mixing chamber. There are flow gaps between adjacent small mixing chambers, and there are also flow gaps between the small mixing chambers and the inner walls of the mixing chambers. The flow gaps around the small mixing chambers and within the inner walls of the mixing chambers are connected. The small mixing chambers serve as the mixing chamber 601 for lean combustion, and the flow gaps serve as the mixing chamber 602 for rich combustion. As shown in the figure, each small mixing chamber is a long empty chamber, and the gaps around the small mixing chambers serve as the above-mentioned flow gaps.

[0035] The combustion panel 7 is positioned at the top of the mixing chamber 6 and is provided with rich-burn flame holes 15 and lean-burn flame holes 16 on its surface. The rich-burn flame holes 15 are connected to the mixing chamber 602 for rich combustion, while the lean-burn flame holes 16 are connected to the mixing chamber 601 for lean combustion. The diameter of the rich-burn flame holes 15 is smaller than that of the lean-burn flame holes 16. Multiple rich-burn flame holes 15 are evenly distributed around each lean-burn flame hole 16, forming a rich-lean combustion unit. Since the combustion panel 7 must withstand high combustion temperatures, a high-temperature-resistant copper-based metal plate can be selected.

[0036] The post-premix burner structure eliminates the need for a fan to premix gas and air. Instead, the fan only needs to draw in air. The gas and air are then separated in the gas injection chamber within the combustion chamber and evenly mixed in the flow equalization chamber. This eliminates the need for expensive and complex premixing fans. Furthermore, the combustion chamber itself can achieve a higher gas flow rate. At the same combustion power, the combustion chamber is lighter in weight and more cost-effective than a fire-grate burner.

[0037] In addition to the above embodiments, the present invention also includes other implementation methods. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of protection of the claims of the present invention.

Claims

1. A post-fan premixed rich-lean burner, comprising a fan (1) and a combustion box, characterized in that: The combustion box comprises an air intake chamber (2), a gas injection chamber (3), a flow equalization chamber (5), a mixing chamber (6) and a combustion panel (7); the fan (1) is connected to the air intake chamber (2) for blowing air into the air intake chamber (2); The gas injection chamber (3) and the air intake chamber (2) are connected so that air enters the gas injection chamber (3). A gas nozzle (9) is provided on one side of the gas injection chamber (3) for injecting gas into the gas injection chamber (3). The gas injection chamber (3) is divided into a gas injection chamber (302) for rich combustion and a gas injection chamber (301) for lean combustion that are not connected to each other and have different air-fuel ratios. A deflection chamber (4) is provided on the other side of the gas injection chamber (3) and is connected to the flow balancing chamber (5) through the deflection chamber (4). The deflection chamber (4) is also divided into a deflection chamber (402) for rich combustion and a deflection chamber (401) for lean combustion. The flow balancing chamber (5) is also divided into a flow balancing chamber (502) for rich combustion and a flow balancing chamber (501) for lean combustion. The gas injection chambers, deflection chambers and flow balancing chambers for the same combustion mode are correspondingly connected. The air intake chamber (2), the gas injection chamber (3), and the equalizing chamber (5) are sequentially distributed from bottom to top. The air intake chamber and the gas injection chamber are connected on one side. The gas injection chamber (3) and the equalizing chamber (5) are connected on the other side via the deflection chamber (4). The gas injection chamber (3) has an airflow cross section that gradually decreases and then gradually increases along the airflow direction. The equalizing chamber (5) has an airflow cross section that gradually decreases along the airflow direction. A plurality of deflection plates arranged at intervals are provided in the deflection chamber (4). The deflection plates (12) divide the deflection chamber (4) into a plurality of deflection gaps, and the airflow is diverted through the plurality of deflection gaps. The mixing chamber (6) is divided into a mixing chamber (602) for rich combustion and a mixing chamber (601) for lean combustion, and the mixing chamber and the flow equalization chamber for the same combustion mode are connected to each other. The combustion panel (7) is arranged on the top of the mixing chamber (6), and a rich combustion flame hole (15) and a lean combustion flame hole (16) are arranged on the surface. The rich combustion flame hole (15) is connected to the mixing chamber (602) for rich combustion, and the lean combustion flame hole (16) is connected to the mixing chamber (601) for lean combustion, thereby realizing rich and lean combustion on the combustion panel (7); The mixing chamber is provided with a plurality of independent small mixing chambers, which are evenly distributed in the mixing chamber. The small mixing chambers are interconnected with the peripheral wall of the mixing chamber and the gaps between adjacent small mixing chambers to form a surround for the small mixing chambers. The small mixing chambers and the surrounding gaps serve as a mixing chamber (601) for lean combustion and a mixing chamber (602) for rich combustion, respectively.

2. The post-fan premixed rich-lean burner according to claim 1, characterized in that: A gas inlet chamber (8) is provided on the combustion box body. The gas inlet chamber (8) is connected to a gas source and is in communication with the gas nozzle (9) for delivering gas to the gas nozzle (9).

3. The post-fan premixed rich-lean burner according to claim 1, characterized in that: The gas injection chamber (3) and the flow equalizing chamber (5) are separated up and down by a guide plate (11), and the guide plate (11) is arranged at an angle to achieve the airflow cross-section shaping of the gas injection chamber (3) and the flow equalizing chamber (5).

4. The post-fan premixed rich-lean burner according to claim 1, characterized in that: The mixing chamber (6) is located above the equalizing chamber (5) and is separated from the upper and lower parts by a partition (13). An air inlet hole (14) is provided on the partition (13). The equalizing chambers (5) used for the same combustion mode are connected to the corresponding mixing chamber (6) through the air inlet hole (14).

5. The post-fan premixed rich-lean burner according to claim 1, characterized in that: The rich combustion flame hole (15) and the lean combustion flame hole (16) are combined to form a rich-lean combustion unit.

6. The post-fan premixed rich-lean burner according to claim 5, characterized in that: The aperture of the rich combustion flame hole (15) is smaller than the aperture of the lean combustion flame hole (16), and one or more rich combustion flame holes (15) are distributed around each lean combustion flame hole (16).

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