A semi-premixed combustion device for a gas boiler
By using a combination structure and regulating mechanism such as annular plates in the semi-premixed combustion device of a gas boiler, the problem of insufficient mixing of gas and air is solved, and uniform mixing of gas and air and improved combustion stability are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANXI HAOBANG ENERGY SAVING & ENVIRONMENTAL PROTECTION TECH CO LTD
- Filing Date
- 2025-07-18
- Publication Date
- 2026-07-24
AI Technical Summary
In traditional semi-premixed combustion devices, the residence time of gas and air in the mixing chamber is short, resulting in insufficient contact between gas and oxygen, and thus failing to achieve a fully uniform mixture.
The system employs a combination structure of annular plate, slot, T-shaped column, first diverter plate, connecting column, second diverter plate, and vertical column to achieve uniform mixing of gas and air. The size of the gas outlet can be adjusted by a mechanism consisting of hollow plate, disc, and rotating shaft to adapt to different working loads.
It achieves a thorough and uniform mixing of fuel gas and air, improves combustion stability, and adapts to combustion requirements under different load conditions.
Smart Images
Figure CN224551545U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gas boiler technology, specifically to a semi-premixed combustion device for gas boilers. Background Technology
[0002] As the name suggests, a gas-fired boiler is a boiler that uses gas as fuel. Most people choose gas-fired boilers for steam, heating, and bathing. When using a gas-fired boiler, a semi-premixed combustion device is needed to mix the gas and air.
[0003] In traditional semi-premixed combustion devices, fuel gas and air enter the mixing chamber through fuel gas pipe and air pipe respectively, where they are mixed. The mixed gas then enters the combustion chamber for combustion. However, during the semi-premixing of gas and air, the gas and air remain in the mixing chamber for a relatively short time, resulting in insufficient contact between the gas and oxygen. This causes a large amount of gas to be discharged without complete combustion, thus preventing the gas and air from being fully and evenly mixed. Utility Model Content
[0004] To address the shortcomings of existing technologies, this utility model provides a semi-premixed combustion device for gas-fired boilers, which solves the problem that when gas and air are semi-premixed, the gas and air cannot fully contact oxygen due to the short residence time of the gas and air inside the mixing chamber, resulting in insufficient and uneven mixing of gas and air.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a semi-premixed combustion device for a gas-fired boiler, comprising a shell, a connecting seat fixed to the top of the shell by bolts, a cylinder fixed to the bottom of the connecting seat, a mixing chamber inside the cylinder, a gas pipe and an air pipe connected to the bottom of the cylinder, and a blocking mechanism inside the cylinder; the blocking mechanism comprises an annular plate, a slot, a T-shaped column, a first diverter plate, a connecting column, a second diverter plate, and a vertical column; the annular plate is fixed to the lower inner wall of the cylinder, a slot is provided on the surface of the annular plate, a T-shaped column is inserted into the inner wall of the slot, a first diverter plate is fixed to the top of the T-shaped column, a second diverter plate is fixed to the first diverter plate via the connecting column, and the outer walls of the first and second diverter plates are attached to the inner wall of the cylinder.
[0006] Preferably, a vertical column is fixed to the top of the second diverter plate.
[0007] Preferably, a first branch pipe is attached to the end of the gas pipe.
[0008] Preferably, the top of the air pipe is connected to a horizontal pipe, and the side wall of the horizontal pipe is connected to a second diverter pipe.
[0009] Preferably, a partition is fixed to the inner wall of the cylinder, and a vertical pipe is connected to the inner wall of the partition.
[0010] Preferably, the connecting seat is provided with an adjustment mechanism; the adjustment mechanism includes a hollow plate, a disc and a rotating shaft; the outer wall of the hollow plate is fixed to the inner wall of the connecting seat by bolts, the inner wall of the hollow plate is rotatably connected to the rotating shaft by bearings, and a disc is fixed to the bottom of the rotating shaft. Beneficial effects
[0011] This invention provides a semi-premixed combustion device for gas-fired boilers. It offers the following advantages: This semi-premixed combustion device for gas-fired boilers, through the cooperation of annular plate, slot, T-shaped column, first diverter plate, connecting column, second diverter plate, and vertical column, achieves uniform mixing of gas and air. This solves the problem that in semi-premixing of gas and air, the short residence time of gas and air within the mixing chamber prevents sufficient contact between gas and oxygen, resulting in incomplete and uniform mixing.
[0012] By coordinating the hollow plate, disc, and rotating shaft, the size of the air outlet on the surface of the hollow plate and disc can be adjusted according to different working loads. This solves the problem that traditional semi-premixed combustion devices cannot adjust the size of the air outlet according to different working loads, resulting in insufficient combustion stability. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 An exterior schematic diagram; Figure 3 for Figure 1 A schematic diagram of the structure of the middle annular plate, the first diverter plate, and the second diverter plate; Figure 4 for Figure 1 Schematic diagram of the middle cylinder, the second branch pipe, and the gas pipe; Figure 5 for Figure 1 A schematic diagram of the structure of the connecting seat, hollow plate and disk.
[0014] In the diagram: 1. Outer shell; 2. Connecting seat; 3. Cylinder; 4. Mixing chamber; 5. Annular plate; 6. Slot; 7. T-shaped column; 8. First diverter plate; 9. Connecting column; 10. Second diverter plate; 11. Vertical column; 12. Gas pipe; 13. First diverter pipe; 14. Air pipe; 15. Horizontal pipe; 16. Second diverter pipe; 17. Partition plate; 18. Vertical pipe; 19. Hollow plate; 20. Disc; 21. Rotating shaft. Detailed Implementation
[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0016] When gas and air are semi-premixed, the gas and air stay in the mixing chamber for a relatively short time, which prevents the gas from fully contacting the oxygen and thus prevents the gas and air from being fully and evenly mixed.
[0017] In view of this, the present invention provides a semi-premixed combustion device for a gas boiler. Through the cooperation between the annular plate, slot, T-shaped column, first diversion plate, connecting column, second diversion plate and vertical column, the gas and air are mixed evenly. This solves the problem that when gas and air are semi-premixed, the gas and air cannot fully contact oxygen due to the short residence time of gas and air in the mixing chamber, thus resulting in insufficient and uneven mixing of gas and air.
[0018] Those skilled in the art can connect the components in this case sequentially. The specific connection and operation sequence should refer to the working principle below. The detailed connection methods are well-known technologies in the field. The working principle and process are mainly introduced below.
[0019] Example 1, by Figure 1-5As can be seen, a semi-premixed combustion device for a gas boiler in this case includes a shell 1. A connecting seat 2 is fixed to the top of the shell 1 by bolts. A cylinder 3 is fixed to the bottom of the connecting seat 2. A mixing chamber 4 is provided inside the cylinder 3. A gas pipe 12 and an air pipe 14 are respectively connected to the bottom of the cylinder 3. A blocking mechanism is provided inside the cylinder 3. The blocking mechanism includes an annular plate 5, a slot 6, a T-shaped column 7, a first diverter plate 8, a connecting column 9, a second diverter plate 10, and a vertical column 11. The annular plate 5 is fixed to the lower inner wall of the cylinder 3. A slot 6 is opened on the surface of the annular plate 5. A T-shaped column 7 is inserted into the inner wall of the slot 6. A first diverter plate 8 is fixed to the top of the T-shaped column 7. A second diverter plate 10 is fixed to the first diverter plate 8 through the connecting column 9. The outer walls of the first diverter plate 8 and the second diverter plate 10 are attached to the inner wall of the cylinder 3. In the specific implementation process, it is worth noting that the outer shell 1, as the external protective structure of the entire combustion device, can effectively protect the internal components from the influence of the external environment, such as dust or moisture, while providing installation support for the internal components. Workers can disassemble and install the outer shell 1 and the connecting seat 2 by rotating the bolts on the connecting seat 2, facilitating later inspection and maintenance of the internal components. The surfaces of the first diversion plate 8 and the second diversion plate 10 have holes. The through hole on the first diversion plate 8 is larger than the hole on the second diversion plate 10. Before the gas boiler starts working, the worker moves the second diversion plate 10, thereby moving the first diversion plate 8. The first diversion plate 8 moves the T-shaped column 7, causing the T-shaped column 7 to insert into the slot 6. Then, the worker... The operator rotates the second diverter plate 10, thereby rotating the T-shaped column 7 to the end of the slot 6, thus installing the first diverter plate 8 and the second diverter plate 10 into the cylinder 3. When the gas boiler is working, the operator opens the valves on the gas pipe 12 and the air pipe 14. At this time, the gas enters the mixing chamber 4 through the gas pipe 12, and the external air enters the mixing chamber 4 through the air pipe 14. The gas and air entering the mixing chamber 4 first encounter the first diverter plate 8. The holes on the first diverter plate 8 change the direction and speed of the airflow, achieving initial diversion and mixing. Then the airflow passes through the holes of the second diverter plate 10, and is further refined and mixed, making the mixing more thorough. The mixed gas enters the connecting seat 2 and is ignited, thus achieving uniform mixing of gas and air. Furthermore, a vertical column 11 is fixedly connected to the top of the second diverter plate 10; In the specific implementation process, it is worth noting that the outer wall of the vertical column 11 is provided with a recessed hole. When the worker installs the blocking mechanism into the inside of the cylinder 3, the worker inserts an external tool into the recessed hole on the surface of the vertical column 11, thereby moving the entire blocking mechanism and placing it on the annular plate 5. The worker then rotates the tool, thereby driving the vertical column 11 to rotate, thereby fixing the first diverter plate 8 and the second diverter plate 10, making it convenient for the worker to install the blocking mechanism. Furthermore, a first branch pipe 13 is attached to the end of the gas pipe 12; In the specific implementation process, it is worth noting that there are two first diversion pipes 13, which are circular in shape. The top of the first diversion pipe 13 is connected to a gas outlet. The gas enters the interior of the first diversion pipe 13 through the gas pipe 12, and finally enters the interior of the mixing chamber 4 through the gas outlet at the top of the first diversion pipe 13. This makes the gas distribution in the mixing chamber 4 more uniform through the first diversion pipe 13, which is conducive to thorough mixing with air. Furthermore, the top of the air pipe 14 is connected to a horizontal pipe 15, and the side wall of the horizontal pipe 15 is connected to a second branch pipe 16. In the specific implementation process, it is worth noting that there are two second diversion pipes 16. The top of the horizontal pipe 15 and the second diversion pipe 16 are respectively connected to nozzles. External air enters the horizontal pipe 15 through the air pipe 14, and then enters the second diversion pipes 16 on both sides through the horizontal pipe 15. Finally, the air enters the interior of the mixing chamber 4 through the nozzles at the top of the horizontal pipe 15 and the second diversion pipe 16, so as to ensure that the air can evenly cover the entire mixing chamber 4 and fully contact the gas. Furthermore, a partition 17 is fixedly connected to the inner wall of the cylinder 3, and a vertical pipe 18 is connected to the inner wall of the partition 17. In the specific implementation process, it is worth noting that a mixing chamber 4 is formed between the inner wall of the cylinder 3 and the partition 17. When the mixed gas enters the interior of the connecting seat 2 through the guide of the vertical pipe 18, the vertical pipe 18 can rectify the gas to a certain extent.
[0020] Example 2, by Figure 1-5 It can be seen that the connecting seat 2 is provided with an adjustment mechanism; the adjustment mechanism includes a hollow plate 19, a disc 20 and a rotating shaft 21; the outer wall of the hollow plate 19 is fixed to the inner wall of the connecting seat 2 by bolts, and the inner wall of the hollow plate 19 is rotatably connected to the rotating shaft 21 by bearings, and the bottom of the rotating shaft 21 is fixed to the disc 20. In the specific implementation process, it is worth noting that the hollow plate 19 is made of a high-strength and wear-resistant material. The specific material is selected according to the actual situation, as long as it meets the working conditions. The bearing is made of ceramic material, such as silicon nitride, which has low density and a small coefficient of thermal expansion, can operate at 1000℃, and has excellent wear resistance. The surface of the rotating shaft 21 has through holes, and the surfaces of the hollow plate 19 and the disc 20 have vent holes. When facing different working loads, the operator inserts an external tool into the through hole on the surface of the rotating shaft 21 and rotates the tool, which drives the rotating shaft 21 to rotate. The rotating shaft 21 drives the disc 20 to rotate, and the disc 20 drives the air outlet holes on its surface to rotate, thereby intersecting the air outlet holes on the surface of the disc 20 with the air outlet holes on the surface of the hollow plate 19, thus changing the size of the air outlet holes between them. For example, when the burner needs to operate under high load, the diameter of the air outlet holes can be increased to improve the combustion power. Under low load conditions, the diameter of the air outlet holes can be reduced or increased to limit the flow rate and increase the flow velocity, so as to prevent the flame from backfired due to the low flow velocity. This allows for adjustment of the size of the air outlet holes on the surfaces of the hollow plate 19 and the disc 20 when facing different working loads.
[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A semi-premixed combustion device for a gas-fired boiler, comprising a housing (1), characterized in that: The top of the outer shell (1) is fixed with a connecting seat (2) by bolts, and the bottom of the connecting seat (2) is fixed with a cylinder (3). The cylinder (3) is provided with a mixing chamber (4). The bottom of the cylinder (3) is connected to a gas pipe (12) and an air pipe (14). The cylinder (3) is provided with a blocking mechanism. The blocking mechanism includes an annular plate (5), a slot (6), a T-shaped post (7), a first diverter plate (8), a connecting post (9), a second diverter plate (10), and a vertical post (11). The annular plate (5) is fixed to the lower inner wall of the cylinder (3). The surface of the annular plate (5) is provided with a slot (6). A T-shaped column (7) is inserted into the inner wall of the slot (6). A first diverter plate (8) is fixed to the top of the T-shaped column (7). A second diverter plate (10) is fixed to the first diverter plate (8) through a connecting column (9). The outer walls of the first diverter plate (8) and the second diverter plate (10) are attached to the inner wall of the cylinder (3).
2. A semi-premixed combustion device for a gas-fired boiler according to claim 1, characterized in that: A vertical column (11) is fixed to the top of the second diverter plate (10).
3. A semi-premixed combustion device for a gas-fired boiler according to claim 1, characterized in that: The end of the gas pipe (12) is attached to the first branch pipe (13).
4. A semi-premixed combustion device for a gas-fired boiler according to claim 1, characterized in that: The top of the air pipe (14) is connected to a horizontal pipe (15), and the side wall of the horizontal pipe (15) is connected to a second diversion pipe (16).
5. A semi-premixed combustion device for a gas-fired boiler according to claim 1, characterized in that: The inner wall of the cylinder (3) is fixed with a partition (17), and the inner wall of the partition (17) is connected to a vertical pipe (18).
6. A semi-premixed combustion device for a gas-fired boiler according to claim 1, characterized in that: The connecting seat (2) is provided with an adjustment mechanism inside; The adjustment mechanism includes a hollow plate (19), a disc (20), and a rotating shaft (21). The outer wall of the hollow plate (19) is fixed to the inner wall of the connecting seat (2) by bolts. The inner wall of the hollow plate (19) is rotatably connected to the rotating shaft (21) by bearings. The bottom of the rotating shaft (21) is fixed to the disc (20).