Efficient air preheating combustion burner assembly

Abstract

The utility model provides an efficient air preheating combustion burner assembly which comprises a combustion chamber and a metal outer box, a heat exchanger is arranged on the upper portion of the combustion chamber, a plurality of air inlet holes are evenly formed in the upper ends of the four sides of the metal outer box, and a sealing baffle is arranged at the bottom end of the metal outer box. Therefore, outside air sequentially passes through the air inlet hole and the preheating channel from top to bottom to reach the inner side of the sealing baffle, and then returns back to enter the combustion chamber from bottom to top. Through the arrangement of the preheating channel, external cold air can be preheated by the temperature of the combustion chamber before entering the combustion chamber, and then enters the combustion chamber through the air inlet holes distributed in the metal baffle plate for intensified combustion, and the preheated high-temperature air firstly passes through the combustor to heat the preheating mixing throat pipe of the combustor when entering the combustion chamber; therefore, the combustion heating efficiency is further improved, and meanwhile, the combustion is more stable.

Description

Technical Field

[0001] The utility model relates to the technical field of burner assemblies for high-efficiency air preheating combustion, and specifically relates to a burner assembly for high-efficiency air preheating combustion. Background Art

[0002] At present, there are two air intake methods for the air required for water heater combustion and premixed air in the market: the first is that the up-draft fan is above the heat exchanger, and the air required for combustion is directly inhaled from below the burner, and the natural cold air enters the combustion chamber; the second is that the down-blow fan is below the burner, and the air required for combustion is blown into the combustion chamber by the fan with natural cold air.

[0003] In the above two cases, air at the natural ambient temperature participates in combustion. The air temperature is generally between -10 and 35 degrees Celsius, which can only meet natural combustion and cannot achieve the effect of enhanced combustion. The thermal efficiency is generally between 89% and 91%, meeting the national standard of secondary energy efficiency. Therefore, a burner assembly for high-efficiency air preheating combustion is proposed to solve the above problems. Content of the Utility Model

[0004] The purpose of the utility model is to provide a burner assembly for high-efficiency air preheating combustion, which improves the combustion heat-up efficiency and makes the combustion more stable at the same time.

[0005] To achieve the above purpose, the utility model provides the following technical solution: a burner assembly for high-efficiency air preheating combustion, including a combustion chamber and a metal outer box. A heat exchanger is arranged on the upper part of the combustion chamber, and a burner is arranged on the lower part. The metal outer box is arranged outside the combustion chamber and forms a preheating channel between it and the outside of the combustion chamber. A plurality of air inlet holes are evenly distributed at the upper ends of the four sides of the metal outer box. A sealing baffle is arranged at the bottom end of the metal outer box, so that the outside air first passes through the air inlet holes, the preheating channel to the inside of the sealing baffle from top to bottom in sequence, and then turns back and enters the combustion chamber from bottom to top.

[0006] Further, a metal baffle is arranged below the burner. The sealing baffle and the metal baffle form a hot air return interval communicated with the preheating channel. A plurality of air inlet holes are arranged on the metal baffle, so that the preheated air entering the hot air return interval enters the combustion chamber from bottom to top in a dispersed manner through the plurality of air inlet holes.

[0007] Further, the air inlet holes are long strip-shaped air inlet holes.

[0008] Further, the side walls of the metal outer box and the combustion chamber are respectively locked and connected by screws.

[0009] Further, the heat absorption fins of the heat exchanger are erected on the upper part of the combustion chamber, and the outer side of the fins abuts against the inner wall of the combustion chamber.

[0010] Furthermore, hemming is provided at the bottom end of the metal outer box, and threaded holes are provided on the hemming. The sealing baffle is threadedly connected to the hemming on the metal outer box through bolts.

[0011] Compared with the prior art, the technical solution of the present application has the following beneficial effects: by providing a preheating channel, the cold air from the outside can be preheated by the temperature of the combustion chamber in advance before entering the combustion chamber, and then enters the combustion chamber through the air inlet holes distributed by the metal baffle to strengthen combustion. When the preheated high-temperature air enters the combustion chamber, it will first pass through the burner to preheat the mixing throat of the burner, so that the gas is preheated, thereby further improving the combustion heat generation efficiency and making the combustion more stable. Description of the Drawings

[0012] Figure 1 It is a schematic diagram of the present utility model;

[0013] Figure 2 It is an exploded view of the structure of the present utility model;

[0014] Figure 3 It is a top exploded view of the structure of the present utility model;

[0015] Figure 4 It is a cross-sectional view of the structure of the present utility model;

[0016] Figure 5 It is a connection structure diagram of the combustion chamber and the metal baffle of the present utility model;

[0017] Figure 6 It is a schematic diagram of the hot air return interval of the present utility model.

[0018] In the figure: 1. Combustion chamber; 2. Heat exchanger; 3. Burner; 4. Metal outer box; 5. Preheating channel; 6. Metal baffle; 7. Air inlet hole; 8. Air inlet hole; 9. Sealing baffle; 10. Metal throat; 11. Hot air return interval; 12. Screw locking connection hole; 13. First screw connection hole. Detailed Embodiments

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model.

[0020] Please refer to Figures 1-6, in this embodiment, a burner assembly for efficient air preheating combustion includes a combustion chamber 1 and a metal outer box 4. A heat exchanger 2 is provided at the upper part of the combustion chamber 1, and a burner 3 is provided at the lower part. The burner 3 is provided with a metal throat 10 for connecting gas. The metal outer box 4 is arranged outside the combustion chamber 1, and a preheating channel 5 is formed between the metal outer box 4 and the outside of the combustion chamber 1. A plurality of long strip air inlet holes 8 are evenly distributed at the upper ends of the four sides of the metal outer box 4. The air inlet holes 8 are long strip air inlet holes 8. A sealing baffle 9 is provided at the bottom end of the metal outer box 4, so that the outside air first passes through the air inlet holes 8, the preheating channel 5 to the inside of the sealing baffle 9 from top to bottom in sequence, and then turns back and enters the combustion chamber 1 from bottom to top.

[0021] To make the hot air disperse and flow upward, a metal baffle 6 is provided below the burner 3. The sealing baffle 9 and the metal baffle 6 form a hot air return interval 11 communicating with the preheating channel 5. A plurality of air inlet holes 7 are provided on the metal baffle 6, so that the preheated air entering the hot air return interval 11 enters the combustion chamber 1 from bottom to top in a dispersed manner through the plurality of air inlet holes 7.

[0022] To facilitate the upward flow of gas in the combustion chamber 1, an exhaust fan is provided at the top of the combustion chamber 1. The exhaust fan provides power for the outside air to first pass through the air inlet holes 8, the preheating channel 5 to the inside of the sealing baffle 9 from top to bottom in sequence, and then turn back and pass through the metal baffle 6 to enter the combustion chamber 1 from bottom to top.

[0023] To fixedly install the combustion chamber 1 in the metal outer box 4, the side walls of the metal outer box 4 and the side walls of the combustion chamber 1 are respectively locked and connected by screws.

[0024] Specifically: screw connection holes one 13 are provided on the four side walls of the metal outer box 4, and screw locking connection holes two 12 are correspondingly provided on the combustion chamber 1.

[0025] In this embodiment, when the water heater fan starts to burn, the hot air inside the combustion chamber 1 is discharged from bottom to top. Since the combustion chamber 1 is suspended in the metal outer box 4 with a closed bottom, the outside cold air enters the preheating channel 5 from top to bottom through the air inlet holes 8 of the metal outer box 4, and is preheated by the combustion temperature of the combustion chamber 1 in the preheating channel 5. The preheated air is transmitted to the hot air return interval 11. After being blocked by the sealing baffle 9, it is transmitted upward, first dispersed through the plurality of air inlet holes 7 on the metal baffle 6, enters the combustion chamber 1 to strengthen combustion, and the preheated air contacts the burner 3 during the process of entering the combustion chamber 1 from bottom to top, preheating the gas in the burner 3, thereby further improving the combustion heat generation efficiency.

[0026] Preferably, as an embodiment of the present utility model, the heat absorption fins of the heat exchanger 2 are installed on the upper part of the combustion chamber 1, and the outer sides of the heat absorption fins are in contact with the inner wall of the combustion chamber 1. Installation holes adapted to the pipes of the heat exchanger 2 are provided on both the metal outer box 4 and the combustion chamber 1, and the pipes of the heat exchanger 2 extend outside the metal outer box 4 through the installation holes.

[0027] In addition to the above embodiments, the heat exchanger 2 can be directly placed on the upper part of the combustion chamber 1, which is convenient for installation and disassembly and thus convenient for maintenance.

[0028] Preferably, flanges are provided at the bottom ends of the metal outer box 4, and threaded holes are provided on the flanges. The sealing baffle 9 is threadedly connected to the flanges on the metal outer box 4 through bolts.

[0029] In this embodiment, the preheated air is blocked by the sealing baffle 9, so that the preheated air turns back into the combustion chamber 1.

[0030] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A burner assembly for efficient air preheating combustion, comprising a combustion chamber (1) and a metal outer box (4). A heat exchanger (2) is provided at the upper part of the combustion chamber (1), and a burner (3) is provided at the lower part. It is characterized in that: The metal outer box (4) is arranged outside the combustion chamber (1), and a preheating channel (5) is formed between the metal outer box (4) and the outside of the combustion chamber (1). A plurality of air inlet holes (8) are evenly arranged at the upper ends of the four sides of the metal outer box (4). A sealing baffle (9) is arranged at the bottom end of the metal outer box (4), so that the outside air first passes through the air inlet holes (8) and the preheating channel (5) from top to bottom in sequence to the inside of the sealing baffle (9), and then turns back and enters the combustion chamber (1) from bottom to top.

2. The burner assembly for high-efficiency air preheating combustion according to claim 1, characterized in that: A metal baffle (6) is arranged below the burner (3). The sealing baffle (9) and the metal baffle (6) form a hot air return interval (11) communicating with the preheating channel (5). A plurality of air intake holes (7) are formed in the metal baffle (6), so that the preheated air entering the hot air return interval (11) is dispersed into the combustion chamber (1) from bottom to top through the plurality of air intake holes (7).

3. The burner assembly for efficient air preheating combustion according to claim 1, characterized in that: The air inlet holes (8) are long strip-shaped air inlet holes (8).

4. The burner assembly for high-efficiency air preheating combustion according to claim 1, characterized in that: The side walls of the metal outer box (4) and the side walls of the combustion chamber (1) are respectively locked and connected by screws.

5. The burner assembly for efficient air preheating combustion according to claim 1, characterized in that: The heat absorption fins of the heat exchanger (2) are arranged above the combustion chamber (1), and the outside of the heat absorption fins abuts against the inner wall of the combustion chamber (1).

6. The burner assembly for high-efficiency air preheating combustion according to claim 1, characterized in that: Flanging is provided at the bottom end of the metal outer box (4), and threaded holes are provided on the flanging. The sealing baffle (9) is threadedly connected to the flanging on the metal outer box (4) by bolts.

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