A coil type wall-hung boiler burner assembly

Abstract

The present application belongs to the field of wall-hanging stove burner, and particularly relates to a coil pipe type wall-hanging stove burner assembly, which comprises a shell, a heat exchanger and a burner. The heat exchanger comprises a disc-shaped heat pipe, which is coiled outside the burner. The front and rear sides of the shell are respectively provided with front and rear mounting end covers. The burner comprises a combustion inner cylinder, a combustion inner cylinder shell, a combustion outer cylinder and a fuel nozzle and ignition needle radially extending into the combustion inner cylinder, which are coaxially arranged from inside to outside. The combustion inner cylinder is installed in the combustion inner cylinder shell, and the combustion inner cylinder shell extends into the combustion outer cylinder. The combustion inner cylinder shell is provided with a flame spouting port near one side of the combustion outer cylinder. The flame spouting port is in butt joint with the opening of the combustion outer cylinder. A plurality of flame holes are formed in the outer wall of the combustion outer cylinder in the circumferential direction. An air introduction cavity is formed between the outer wall of the combustion inner cylinder and the inner wall of the combustion inner cylinder shell, and a backfire chamber is formed between the outer wall of the combustion inner cylinder and the inner cavity of the combustion outer cylinder. The present application has the advantages of compact structure, good heat absorption effect and high thermal efficiency.

Description

Technical Field

[0001] This invention belongs to the field of wall-hung boiler burners, and specifically relates to a coil-type wall-hung boiler burner assembly. Background Technology

[0002] Existing wall-hung boiler burners heat water in pipes, then exchange heat with domestic hot water through a heat exchanger to meet users' heating needs. However, existing burners suffer from problems such as large size, uneven flame distribution, incomplete combustion, and poor combustion efficiency. Typically, some burners produce large flames while others produce small flames, resulting in uneven combustion and low energy efficiency. Conventional wall-hung boilers often require a large space for complete fuel combustion to meet users' heating and domestic hot water needs.

[0003] The existing burner needs further improvement to achieve uniform flame and complete combustion within a limited space, resulting in a better combustion effect and a better user experience. Summary of the Invention

[0004] To address the technical problems existing in the prior art and achieve the above-mentioned objectives, the present invention provides a coil-type wall-hung boiler burner assembly, including a shell, a heat exchanger, and a burner. The heat exchanger includes a coiled heat pipe and a circulating water pump. The coiled heat pipe is coiled around the outside of the burner. A front mounting end cover and a rear mounting end cover are respectively provided on the front and rear sides of the shell. The burner includes a combustion inner cylinder, a combustion inner cylinder outer shell, and a combustion outer cylinder arranged coaxially from the inside out, as well as a fuel nozzle, an ignition needle, and a flame detection needle extending radially into the combustion inner cylinder. The combustion inner cylinder shaft... The cross-section is "door" shaped. The combustion inner cylinder is installed inside the combustion inner cylinder outer shell. The combustion inner cylinder outer shell extends into the combustion outer cylinder. The combustion inner cylinder outer shell has a flame nozzle on the side near the combustion outer cylinder. The flame nozzle is connected to the opening of the combustion outer cylinder. Several flame holes are opened along the circumferential direction on the outer wall of the combustion outer cylinder. An air inlet cavity is formed between the outer wall of the combustion inner cylinder and the inner wall of the combustion inner cylinder outer shell. The inner side of the combustion inner cylinder is a combustion cavity. A tempering chamber is formed between the outer wall of the combustion inner cylinder and the inner cavity of the combustion outer cylinder. The combustion outer cylinder and the disc-shaped heat pipe on its outer side constitute a heating cavity.

[0005] The combustion inner cylinder includes a cylinder body and a flange. The flange and the cylinder body are provided with an inclined surface that slopes towards the inner wall of the cylinder body. The flange is provided with a plurality of first air inlets, which are oriented towards the inclined surface. The cylinder body is provided with a plurality of second air inlets evenly distributed around its circumference.

[0006] A central hole is formed in the middle of the front mounting end cap. An inner annular boss and an outer annular boss are respectively provided on the inner and outer end faces of the central hole. An air supply pipe is formed on the annular wall of the outer annular boss. The combustion inner cylinder shell is fixedly installed inside the front mounting end cap. The inner annular boss fits against the inner wall of the combustion inner cylinder shell, and the end face of the inner annular boss abuts against the flange of the combustion inner cylinder. An air pre-introduction cavity is formed between the outer end face of the flange and the inner wall of the outer annular boss and the inner wall of the inner annular boss. The inner wall of the combustion inner cylinder shell is provided with a locking protrusion for the combustion inner cylinder. The annular shoulder of the outer ring has a gap formed at the bottom of the combustion inner cylinder away from the bottom of the combustion inner cylinder outer shell. The air pre-introduction chamber and the air introduction chamber are connected through a first air inlet. The air introduction chamber and the combustion chamber are connected through a second air inlet and the gap. The combustion chamber is connected to the flashback chamber through a flame nozzle. The flashback chamber is connected to the heating chamber through an opening near the side of the combustion inner cylinder outer shell and a flame hole. A fixing seat is matched on the outer end face of the outer annular boss. The fuel nozzle, ignition needle, and flame detection needle are integrated and installed on the fixing seat.

[0007] The housing includes a housing body and cover mounting portions that are connected to both sides of the housing body. The cover mounting portions are fixed to both sides of the housing body by a number of screws. The front mounting end cover and the rear mounting end cover are respectively fixedly mounted on the cover mounting portions on both sides. A condensate drain outlet is provided at the lower end of the cover mounting portion on one side of the rear mounting end cover.

[0008] The fuel nozzle is provided with a conical baffle at the end and a conical hole is formed at the end of the fuel nozzle. The fuel is sprayed out in a fan shape from the conical hole, which faces the second air inlet.

[0009] The rear mounting end cap is provided with a base boss on the side near the disc-shaped heat pipe. The combustion outer cylinder is fixedly mounted on the base boss. A smoke box is provided on the other side of the rear mounting end cap. A flue gas guide cavity is formed between the smoke box and the outer side of the mounting end cap. A first smoke outlet is opened on the top of the base boss, and a second smoke outlet is opened on the top of the smoke box.

[0010] Fire-resistant plates are respectively provided on the side of the front mounting end cap near the inner cavity of the disc-shaped heat pipe and on the base boss of the rear mounting end cap.

[0011] The disc-shaped heat pipe includes an inlet and an outlet, and the inlet is connected to a water tank via a circulating water pump.

[0012] An observation window is provided on the front mounting end cover.

[0013] The inner diameter of the outer annular boss is larger than the inner diameter of the inner annular boss.

[0014] This invention has the following features and beneficial effects: An igniter and fuel nozzle are inserted into the combustion inner cylinder. Fuel is sprayed in a fan shape through a conical hole formed at the end of the nozzle. The conical hole faces the second air inlet, which is beneficial for combustion. The fuel burns in the combustion inner cylinder, fully preheating both the inner and outer cylinders. The sprayed fuel is atomized. The remaining fuel after atomization enters the preheated outer cylinder for vaporization and then undergoes further combustion. An air inlet chamber is formed between the combustion inner cylinder and its outer shell. The combustion inner cylinder is under negative pressure, drawing in outside air. Air at different angles inside the circular combustion inner cylinder forms a rotating airflow, further increasing the contact area between the combustion air and the fuel gas, resulting in a more uniform mixture. This allows the mixture to burn for the first time within the inner cylinder. The flame from the combustion inner cylinder enters the space between the outer wall of the combustion inner cylinder and the inner cavity of the outer cylinder along the nozzle, forming a flashback chamber. The flame from the outer cylinder then... The flame is ejected outwards for a second combustion, heating the water in the disc-shaped heat pipe. This structure is compact, has good heat absorption, and high thermal efficiency. Each chamber has a flat structure with tight connections, resulting in a relatively flat overall structure. This ensures combustion efficiency while facilitating wall mounting, making installation easy and minimizing the axial distance of the overall structure. The combustion outer cylinder is installed on the rear end cover base boss, with the rear half of the disc-shaped heat pipe positioned on one side of the boss as a condensation zone. This zone absorbs some of the waste heat from the flue gas to heat the heating return water. Waste heat recovery from the flue gas helps lower the flue gas temperature before it is discharged. The condensate formed in the condensation zone is drained through the condensate drain outlet located at the lower end of the cover mounting part. The flue gas can flow between the gaps of the disc-shaped heat pipes in the heat exchanger, enters the smoke box through the first exhaust port, and is then drawn away by the second exhaust port at the top of the smoke box, reducing resistance during flue gas discharge. Finally, the flue gas is discharged through each exhaust port. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the half-section structure of the present invention; Figure 3 This is a schematic diagram of the half-section structure of each chamber of the present invention; Figure 4 Schematic diagram of the disc-shaped heat pipe structure of the present invention; Figure 5 This is a schematic diagram of the combustion inner cylinder structure of the present invention; Figure 6 This is a schematic diagram of the combustion inner cylinder outer shell structure of the present invention; Figure 7 This is a schematic diagram of the combustion outer cylinder structure of the present invention; Figure 8 This is a schematic diagram of the installation of the combustion inner cylinder, the combustion inner cylinder outer shell, and the combustion outer cylinder of the present invention. Figure 9This is a schematic diagram of the fuel nozzle structure of the present invention; Figure 10 This is a schematic diagram illustrating the air and fuel flow patterns of the present invention. Figure 11 This is a schematic diagram of the front mounting end cap structure of the present invention; Figure 12 This is a schematic diagram of the half-section structure of the front mounting end cap of the present invention; Figure 13 This is a schematic diagram of the rear-mounted end cap structure of the present invention; Figure 14 This is a schematic diagram of the installation structure of the rear-mounted end cap and smoke box of the present invention.

[0016] In the diagram: 1-Shell; 101-Shell body; 102-Cover mounting part; 1021-Condensate drain outlet; 11-Front mounting end cover; 111-Inner annular boss; 112-Outer annular boss; 113-Air supply duct; 114-Air pre-introduction cavity; 115-Observation window; 12-Rear mounting end cover; 120-Base boss; 121-Smoke box; 122-First smoke exhaust outlet; 123-Smoke guide cavity; 124-Second smoke exhaust outlet; 13-Fixing base; 14-Refractory plate; 15-Screw; 21-Disc heat pipe; 21 1-Water inlet; 212-Water outlet; 31-Inner combustion cylinder; 311-Cylinder body; 312-Flange; 313-First air inlet; 314-Second air inlet; 32-Outer shell of inner combustion cylinder; 321-Flame nozzle; 322-Annular shoulder; 33-Outer combustion cylinder; 331-Flame hole; 34-Temperature chamber; 35-Air inlet chamber; 36-Gap; 37-Combustion chamber; 38-Heating chamber; 51-Fuel nozzle; 511-Conical baffle; 512-Conical hole; 52-Ignition needle; 53-Flame detection needle. Detailed Implementation

[0017] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, this invention will be further described in detail. It should be understood that the specific embodiments described herein are only for explaining this invention and are not intended to limit this invention.

[0018] like Figure 1-10As shown, a coil-type wall-hung boiler burner assembly includes a shell 1, a heat exchanger, and a burner. The heat exchanger includes a coiled heat pipe 21 and a circulating water pump. The coiled heat pipe is coiled around the outside of the burner and includes an inlet 211 and an outlet 212. The inlet is connected to a water tank via the circulating water pump. The shell includes a shell body 101 and cover mounting portions 102 that are connected to both sides of the shell body 101. The cover mounting portions 102 are fixed to both sides of the shell body by a plurality of screws 15. A front mounting end cover 11 and a rear mounting end cover 12 are respectively fixedly mounted on the side cover mounting portions 102. The burner includes a combustion inner cylinder 31, a combustion inner cylinder outer shell 32, and a combustion outer cylinder 33 arranged coaxially from the inside out, as well as a fuel nozzle 51, an ignition needle 52, and a flame detection needle 53 extending radially into the combustion inner cylinder. The combustion inner cylinder 31 includes a cylinder body 311 and a flange 312. The flange 312 has an inclined surface at its connection with the cylinder body, sloping towards the inner wall of the cylinder. The flange 312 has several first air inlets 313 facing the inclined surface. The cylinder body 311 has several second air inlets 314 evenly distributed around its circumference. The bottom of the combustion inner cylinder 31 is open. The bottom of the combustion inner cylinder outer shell 32 has a flame nozzle 321. The outer cylinder 33 has several flame holes 331 circumferentially formed on its outer wall. The combustion inner cylinder has a "door" shaped cross-section and is installed inside the combustion inner cylinder outer shell 32. The outer edge of the flange 312 of the combustion inner cylinder 31 is fitted against the inner wall of the combustion inner cylinder outer shell 32. The inner wall of the combustion inner cylinder outer shell 32 is provided with an annular shoulder 322 that engages with the flange 312. The bottom of the combustion inner cylinder is far from the bottom of the combustion inner cylinder outer shell, forming a gap 36. The combustion inner cylinder outer shell 32 extends into the combustion outer cylinder 33 and is located at the front end of the combustion outer cylinder 33. The inner diameter of the flame nozzle 321 is smaller than the inner diameter of the open end of the combustion inner cylinder 31. The fuel nozzle end is provided with a conical baffle 511 and a conical hole 512 is formed at the fuel nozzle end. Fuel is sprayed in a fan shape from the conical hole 512, and the conical hole is sprayed toward the second air inlet 314, rapidly mixing the atomized fuel with air and igniting it. An air inlet cavity 35 is formed between the outer wall of the combustion inner cylinder and the inner wall of the combustion inner cylinder outer shell. The inner side of the combustion inner cylinder is a combustion chamber 37. A tempering chamber 34 is formed between the outer wall of the combustion inner cylinder and the inner cavity of the combustion outer cylinder. The combustion outer cylinder and the disc-shaped heat pipe on its outer side constitute a heating chamber 38. An air pre-inlet cavity 114 is formed between the outer end face of the flange and the inner wall of the outer annular boss and the inner wall of the inner annular boss. The air pre-inlet cavity and the air inlet cavity are connected through a first air inlet hole. The air inlet cavity and the combustion chamber are connected through a second air inlet hole and a gap. The combustion chamber is connected to the tempering chamber through a flame nozzle. The tempering chamber is connected to the heating chamber through an opening end near the outer shell of the combustion inner cylinder and a flame hole.

[0019] like Figure 11-12As shown, a central hole 110 is provided in the middle of the front mounting end cover. An inner annular boss 111 and an outer annular boss 112 are respectively provided on the inner and outer end faces of the central hole 110. The inner diameter of the outer annular boss is larger than the inner diameter of the inner annular boss. An air supply pipe 113 is provided on the annular wall of the outer annular boss 112. An observation window 115 is provided on the front mounting end cover. A fire-resistant plate 14 is provided on the side of the front mounting end cover 11 near the inner cavity of the disc-shaped heat pipe 21.

[0020] like Figure 3 , 13 As shown in Figure 14, a base boss 120 is provided on the side of the rear mounting end cover 12 near the disc-shaped heat pipe. The combustion outer cylinder is fixedly mounted on the base boss 120. The base boss 120 has an open outer side. A smoke box 121 is provided on the other side of the rear mounting end cover. The smoke box 121 and the mounting end cover form a flue gas guiding cavity 123. A first smoke outlet 122 is opened on the top of the base boss, and a second smoke outlet 124 is opened on the top of the smoke box. A fire-resistant plate 14 is provided on the base boss of the rear mounting end cover 12.

[0021] The structure and working principle of this invention are as follows: The combustion inner cylinder shell 32 is fixedly installed inside the front mounting end cover. The inner annular boss 111 fits against the inner wall of the combustion inner cylinder shell 32, and the end face of the inner annular boss 111 abuts against the flange 312 of the combustion inner cylinder 31. A fixing seat 13 is matched and provided on the outer end face of the outer annular boss 112. The fuel nozzle 51, ignition needle 52, and flame detection needle 53 are integrated and fixed on the fixing seat 13. A hole for accommodating the fuel nozzle 51 is provided in the middle of the flange 312 of the combustion inner cylinder 31. The fuel is sprayed in a fan shape through the conical hole formed at the end of the nozzle. The conical hole faces the second inlet. The air inlet is formed between the combustion inner cylinder and the outer shell of the combustion inner cylinder. The combustion inner cylinder is under negative pressure, which draws in outside air. The air at different angles inside the combustion inner cylinder forms a rotating airflow, which further increases the contact area between the combustion air and the fuel gas, making the mixture more uniform. This allows the mixture to burn for the first time inside the combustion inner cylinder. The flame of the combustion inner cylinder enters the space between the outer wall of the combustion inner cylinder and the inner cavity of the outer cylinder through the flame nozzle, forming a flashback chamber. Then, the flame is sprayed outward from the flame hole of the outer cylinder to form a second combustion, which heats the water in the disc-shaped heat pipe, which is beneficial to combustion. The fuel nozzle 51 sprays fuel in a mist form, which is simultaneously ignited by the ignition needle 52. The atomized fuel burns in the inner combustion chamber and preheats the outer combustion chamber. The flame is ejected from the nozzle. The remaining fuel after atomization enters the preheated outer combustion chamber for vaporization. It then returns to the tempering chamber 34, formed between the outer wall of the inner combustion chamber 31 and the inner cavity of the outer combustion chamber 33, to form a tempering effect. The vaporized fuel undergoes further combustion in the tempering chamber 34 and is then ejected from the flame hole 331. The burner then ignites the nearby disc-shaped heat pipe 2. 1. Heating: The disc-shaped heat pipes are circulated by a pump, with the medium drawn in through the inlet. After heating, the medium flows out through the outlet to the radiators and other areas requiring heating. To lower the exhaust temperature, the rear end of the disc-shaped heat pipes has 3-4 empty discs as a condensation zone, which absorbs some of the waste heat from the flue gas to heat the heating return water. The flue gas generated by combustion is quickly cooled and discharged. The exhaust gas after fuel combustion is discharged through the first exhaust port 122 on the top of the rear end cover base boss, the flue gas guide chamber, and the second exhaust port 124 on the top of the smoke box. A fan is connected at the air supply pipe 113 to increase the mixing of air and fuel, ensuring complete combustion. This structure is compact, has good heat absorption, and high thermal efficiency. Each chamber has a flat structure with tight connections. The overall structure is relatively flat, ensuring combustion efficiency while facilitating wall mounting, thus simplifying installation and minimizing the axial distance of the overall structure.

Claims

1. A coil-type wall-hung boiler burner assembly, comprising a shell, a heat exchanger, and a burner, wherein the heat exchanger includes a coiled heat pipe (21) and a circulating water pump, the coiled heat pipe being coiled around the outside of the burner, and a front mounting end cap (11) and a rear mounting end cap (12) are respectively provided on the front and rear sides of the shell, characterized in that: The burner includes a combustion inner cylinder (31), a combustion inner cylinder outer shell (32), a combustion outer cylinder (33) arranged coaxially from the inside to the outside, and a fuel nozzle (51), an ignition needle (52), and a flame detection needle (53) extending radially into the combustion inner cylinder. The axial cross-section of the combustion inner cylinder is "door" shaped. The combustion inner cylinder is installed inside the combustion inner cylinder outer shell, and the combustion inner cylinder outer shell extends into the combustion outer cylinder. The combustion inner cylinder outer shell has a flame nozzle (321) on the side near the combustion outer cylinder, and the flame nozzle is connected to the opening of the combustion outer cylinder. Several flame holes (331) are opened along the circumferential direction on the outer wall of the combustion outer cylinder. An air inlet cavity (35) is formed between the outer wall of the combustion inner cylinder and the inner wall of the combustion inner cylinder outer shell. The inner side of the combustion inner cylinder is a combustion cavity (37). A tempering chamber (34) is formed between the outer wall of the combustion inner cylinder and the inner cavity of the combustion outer cylinder. The combustion outer cylinder and the disc-shaped heat pipe on its outer side constitute a heating cavity (38). The combustion inner cylinder includes a cylinder body (311). The combustion inner cylinder shell is fixedly installed inside the front mounting end cover. The inner annular boss is in contact with the inner wall of the combustion inner cylinder shell. The end face of the inner annular boss is in contact with the flange of the combustion inner cylinder. An air pre-introduction cavity (114) is formed between the outer end face of the flange and the inner wall of the outer annular boss and the inner wall of the inner annular boss. The inner wall of the combustion inner cylinder shell is fixedly installed inside the front mounting end cover. The inner annular boss is in contact with the inner wall of the combustion inner cylinder shell. The end face of the inner annular boss is in contact with the flange of the combustion inner cylinder. An air pre-introduction cavity (114) is formed between the outer end face of the flange and the inner wall of the outer annular boss and the inner wall of the inner annular boss. The inner wall of the combustion inner cylinder shell is provided with an annular shoulder (322) for engaging the flange of the combustion inner cylinder. The bottom of the combustion inner cylinder forms a gap (36) away from the bottom of the combustion inner cylinder outer shell. The air pre-introduction chamber and the air introduction chamber are connected through the first air inlet. The air introduction chamber and the combustion chamber are connected through the second air inlet and the gap. The combustion chamber is connected to the flashback chamber through the flame nozzle. The flashback chamber is connected to the heating chamber through the opening end near the side of the combustion inner cylinder outer shell and the flame hole. The outer end face of the outer annular boss is matched with a fixing seat (13). The fuel nozzle, ignition needle and flame detection needle are integrated and installed on the fixing seat.

2. The coil-type wall-hung boiler burner assembly according to claim 1, characterized in that: The housing includes a housing body (101) and cover mounting parts (102) that are combined with both sides of the housing body. The cover mounting parts are fixed to both sides of the housing body by a plurality of screws (15). The front mounting end cover and the rear mounting end cover are respectively fixedly mounted on the cover mounting parts on both sides. A condensate drain outlet (1021) is provided at the lower end of the cover mounting part on one side of the rear mounting end cover.

3. The coil-type wall-hung boiler burner assembly according to claim 2, characterized in that: The fuel nozzle end is provided with a conical baffle (511) and a conical hole (512) is formed at the fuel nozzle end. Fuel is sprayed from the conical hole in a fan shape, and the conical hole faces the second air inlet.

4. The coil-type wall-hung boiler burner assembly according to claim 3, characterized in that: The rear mounting end cap is provided with a base boss (120) on the side near the disc-shaped heat pipe. The combustion outer cylinder is fixedly installed on the base boss. A smoke box (121) is provided on the other side of the rear mounting end cap. A flue gas guide cavity (123) is formed between the smoke box and the outer side of the mounting end cap. A first smoke outlet (122) is opened on the top of the base boss. A second smoke outlet (124) is opened on the top of the smoke box.

5. A coil-type wall-hung boiler burner assembly according to claim 4, characterized in that: A fire-resistant plate (14) is provided on the side of the front mounting end cover near the inner cavity of the disc-shaped heat pipe and on the base boss of the rear mounting end cover, respectively.

6. A coil-type wall-hung boiler burner assembly according to any one of claims 1-5, characterized in that: The disc-shaped heat pipe includes an inlet (211) and an outlet (212), and the inlet is connected to a water tank via a circulating water pump.

7. A coil-type wall-hung boiler burner assembly according to claim 5, characterized in that: An observation window (115) is provided on the front mounting end cover.

8. The coil-type wall-hung boiler burner assembly according to claim 1, characterized in that: The inner diameter of the outer annular boss is larger than the inner diameter of the inner annular boss.

Images