A burner

Abstract

The present invention relates to a burner, comprising a shell (1) and a plurality of fire bars arranged in the shell (1), each of the fire bars being connected to a corresponding ejector tube, and the shell (1) being further provided with a gas distribution pipe (3) and an ignition needle (61) corresponding to each ejector tube; the characteristics are as follows: the fire bars comprise a plurality of combustion fire bars (4) and a pilot fire bar (5); each of the combustion fire bars (4) is arranged in sequence along the length direction of the shell, and the gaps between adjacent combustion fire bars form an air passage (7); the pilot fire bar (5) is arranged in the shell perpendicular to each of the combustion fire bars (4), and the length of the pilot fire bar (5) is adapted to the length of the inner cavity of the shell to correspond to all the combustion fire bars; the ignition needle (6) is arranged corresponding to the pilot fire bar (5). The present invention has a fast fire transmission speed, full combustion, high combustion efficiency, is environmentally friendly, and improves the heating uniformity of the heat exchanger heated by the burner.

Description

Technical Field

[0001] The present invention relates to the field of water heaters, in particular to a burner for water heaters. Background Art

[0002] The existing water heater burner chamber box mainly includes a combustion chamber shell and a fire bar arranged in the shell. The fire bars are arranged in parallel in the combustion chamber shell, and there is a gap between adjacent fire bars for air to pass through. A front pipe nozzle is set at the entrance of each fire bar. The fire bar connected to the gas is selected through the solenoid valve and the front pipe selection mechanism, thereby controlling the combustion stage and obtaining the heating effect of different stages.

[0003] The ignition needle of the burner is usually placed above the fire bar at the head position. When the burner is working, the ignition needle ignites the corresponding fire bar, and the ignition of the remaining fire bars is transmitted through the flame on the already ignited fire bar, and the switching between the sections needs to be guaranteed by fast and reliable flame transmission.

[0004] In order to successfully transfer the flame or meet the requirements of the speed of flame transfer, the gap between the flame strips should be as small as possible; on the other hand, in order to make the gas burn fully, it is necessary to provide enough air to the flame, so there must be enough space between each flame strip. These two form a contradiction. The current burner achieves a balance between the two by losing part of the flame transfer speed and part of the air supplement, but this design will also lose the constant temperature performance of the water heater; and once there is a slight structural change, it is easy to cause the failure of flame transfer, or even cause serious safety accidents.

[0005] Furthermore, due to the need for fire transmission, each stage must include a fire bar corresponding to the ignition needle at the head end position, which results in the fire bar of each stage being set on one side. The temperature in the combustion chamber is very uneven, affecting the service life of the heat exchanger and the pollutant content of the flue gas. In order to ensure the amount of air, the fan speed is relatively high when the small stage is burning, but at this time there is a large area of ​​the air inlet area without combustion, resulting in this part of the air being wasted. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a burner that can quickly transfer fire and fully burn without losing the fire transfer speed and air supplement amount in view of the current status of the prior art, and the fire rows on each section can be evenly arranged relative to the heat exchange tubes of the water heater to improve the uniformity of heating of the heat exchange tubes.

[0007] The technical solution adopted by the present invention to solve the above technical problems is as follows: the burner comprises a shell and a plurality of fire bars arranged in the shell, each of the fire bars is connected to a corresponding ejector pipe, and the shell is also provided with a gas distribution pipe and an ignition needle corresponding to each ejector pipe;

[0008] Features:

[0009] The fire bars include a plurality of combustion fire bars and an ignition fire bar; the combustion fire bars are arranged in sequence along the length direction of the shell, and the gaps between adjacent combustion fire bars form air passages;

[0010] The ignition fire bar is arranged in the shell perpendicular to each of the combustion fire bars, and the length of the ignition fire bar is adapted to the length of the inner cavity of the shell to correspond to all the combustion fire bars;

[0011] The ignition needle is arranged corresponding to the ignition fire bar.

[0012] Considering the combustion stability, flame stabilizing wall plates can be provided on the opposite side edges of the fire hole panels of each fire bar, and the flame stabilizing wall plates are higher than the corresponding fire hole panels; a combustion chamber is formed between the two flame stabilizing wall plates on each combustion fire bar, and a ignition chamber is formed between the two flame stabilizing wall plates on the ignition fire bar;

[0013] A plurality of ignition grooves facing the combustion fire bars are arranged at intervals on the flame stabilizing wall plate of the ignition fire bar facing the combustion fire bar, and the combustion chamber on the combustion fire bar and the ignition chamber on the ignition fire bar are connected through the ignition grooves.

[0014] The combustion fire bars in the above methods can be divided into multiple groups according to the design of the combustion sections to obtain different heating effects; preferably, each of the combustion fire bars is divided into two groups, including a first group of combustion fire bars composed of a plurality of first combustion fire bars and a second group of combustion fire bars composed of a plurality of second combustion fire bars; each of the first combustion fire bars is stacked and arranged along the center of the inner cavity of the shell, and each of the first combustion fire bars is adjacent to the second combustion fire bar. The combustion fire bars are divided into two groups to obtain three combustion sections, which can meet the daily heating requirements of most water heaters, and has a simple structure and is easy to process; at the same time, the first combustion fire bars and the second combustion fire bars are arranged at intervals, so that the burner can evenly heat the corresponding heat exchanger at different sections, thereby improving the balanced heating of the heat exchanger.

[0015] Furthermore, the second group of combustion fire bars may have an odd number of second combustion fire bars, one of which is arranged at the center of the inner cavity of the shell, and the remaining second combustion fire bars are symmetrically arranged relative to the center of the inner cavity of the shell.

[0016] Preferably, each first combustion fire row can be evenly arranged in the inner cavity of the shell, and each second combustion fire row can be evenly arranged in the inner cavity of the shell.

[0017] In the above schemes, the structure of the gas distribution pipe can be multiple. Preferably, the gas distribution pipe can include a body and nozzles arranged on the body corresponding to each of the ejector pipes.

[0018] The main body is provided with an ignition channel connected to the ignition nozzle corresponding to the ignition ejection tube, a first channel connected to each first nozzle corresponding to the first group of combustion fire bars, and a second channel connected to each second nozzle corresponding to the second group of combustion fire bars;

[0019] The first channel, the second channel and the ignition channel are independent of each other;

[0020] An ignition electromagnetic valve is arranged on the ignition channel, a first electromagnetic valve is arranged on the first channel, and a second electromagnetic valve is arranged on the second channel to switch the ignition channel, the first channel and the second channel.

[0021] To facilitate the processing and assembly of parts, preferably, the main body may include a cover body and a base body, and a cavity is formed between the cover body and the base body after the cover body and the base body are connected;

[0022] The first channel, the second channel and the ignition channel are arranged on the cover body; each of the nozzles is arranged on the base body;

[0023] Corresponding to the second nozzle, a plurality of annular first flanges are provided on the inner side surface of the base body facing the cover body, and these first flanges are all sealed and connected to the inner side wall of the cover body, so that the inner cavity of the first flange is independent of the cavity;

[0024] The second channel is connected to the inner cavity of each first flange, thereby connecting to each second nozzle;

[0025] The first channel on the cover body is connected to each of the first nozzles through the cavity;

[0026] The ignition passage is connected to the ignition nozzle.

[0027] To facilitate the arrangement of the pilot nozzle, a convex block may be formed on the upper edge of the base, and the pilot nozzle is arranged on the convex block; the outlet direction of the pilot nozzle is perpendicular to the outlet direction of each of the combustion nozzles;

[0028] The first nozzle and the second nozzle are arranged in a row.

[0029] A pressing plate may be further provided between the cover body and the base body; the pressing plate is provided with a first through hole corresponding to the first channel, a second through hole corresponding to the second channel, and an ignition through hole corresponding to the ignition channel;

[0030] Each of the first flanges is sealingly connected to the pressure plate.

[0031] Furthermore, a second annular flange may be provided on the side wall of the base body facing the cover body, the second flange is sealed and connected to the pressure plate, and the inner cavity of the second flange is independent of the cavity and connected to the ignition channel and the ignition nozzle.

[0032] Furthermore, a first sealing gasket may be provided between the pressing plate and the cover body, and a second sealing gasket may be provided between the pressing plate and the base body, so as to reduce the machining accuracy requirements of each component while ensuring the sealing of each channel.

[0033] Compared with the prior art, the burner provided by the present invention can ignite each combustion fire bar at the same time through the design of the ignition fire bar, breaking the disadvantages of the prior art of concentrated arrangement of each section and slow ignition speed caused by ignition. The fire transmission speed is extremely fast, and the interval between adjacent fire bars can be designed according to the ideal supplementary air requirements to ensure the sufficiency of combustion, improve combustion efficiency, and reduce the emission of harmful substances; at the same time, the supplementary air can be fully utilized to reduce noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a three-dimensional schematic diagram of the assembly structure of an embodiment of the present invention;

[0035] Figure 2 This is a three-dimensional schematic diagram of an embodiment of the present invention after omitting the gas distribution pipe and the front cover plate of the housing;

[0036] Figure 3 It is a three-dimensional schematic diagram of the assembly structure of the ignition fire bar and the ignition ejection tube in an embodiment of the present invention;

[0037] Figure 4 It is a three-dimensional schematic diagram of the assembly structure of the combustion fire grate and the combustion ejector pipe in an embodiment of the present invention;

[0038] Figure 5 It is a three-dimensional schematic diagram of the gas distribution pipe assembly structure in an embodiment of the present invention;

[0039] Figure 6 for Figure 5 Exploded diagram;

[0040] Figure 7 is a three-dimensional schematic diagram of a substrate in an embodiment of the present invention;

[0041] Figure 8 for Figure 5 Longitudinal cross-sectional view of . DETAILED DESCRIPTION

[0042] The present invention is further described in detail below with reference to the accompanying drawings.

[0043] like Figures 1 to 8 As shown, the burner comprises:

[0044] The shell 1 is used to accommodate the burner fire grate and the ejector tube, and serves as the installation base of other components. In this embodiment, the inner cavity of the shell 1 is roughly a rectangular structure, and the upper end of the shell is open for flame combustion. An air inlet 11 is provided on the lower cover plate of the shell for a blower (not shown in the figure) to blow air into the shell.

[0045] The fire grate is arranged in the inner cavity of the shell, and there are two types, including a combustion fire grate 4 and an ignition fire grate 5.

[0046] There are multiple combustion fire bars 4, which are arranged in sequence along the length direction of the inner cavity of the shell and parallel to the width direction of the shell; the spacing between adjacent combustion fire bars forms an air channel 7 for secondary air supply, and each air channel is connected to the air inlet 11. The number of combustion fire bars can be set according to the specifications of the burner. In this embodiment, there are eleven combustion fire bars, which are divided into two groups. The first group of combustion fire bars consists of four first combustion fire bars 41. The four first combustion fire bars 41 are symmetrically arranged relative to the center position of the length direction of the inner cavity of the shell, and second combustion fire bars 42 are arranged between adjacent first combustion fire bars 41.

[0047] The second group of combustion fire bars consists of seven second combustion fire bars 42, one of which is located at the center of the shell cavity, and the remaining six second combustion fire bars 42 are symmetrically arranged relative to the center of the shell cavity to ensure uniform heating of the heat exchanger.

[0048] The second combustion fire bars are arranged at intervals from the first combustion fire bars, and one second combustion fire bar or two second combustion fire bars may be arranged between adjacent first combustion fire bars.

[0049] There is an ignition fire bar 5, which is arranged in the shell perpendicular to each combustion fire bar 4. The length of the ignition fire bar 5 is adapted to the length of the inner cavity of the shell, and is arranged close to the side wall of the shell in the length direction to cover all the combustion fire bars for easy fire transmission.

[0050] Flame-stabilizing wall panels 44, 54 for stabilizing flames are provided on the opposite side edges in the length direction of the fire hole panels 43, 53 of each fire row, and the flame-stabilizing wall panels 44, 54 are higher than the corresponding fire hole panels 43, 53; a combustion chamber 45 is formed between the two flame-stabilizing wall panels on each combustion fire row, and an ignition chamber 55 is formed between the two flame-stabilizing wall panels on the ignition fire row.

[0051] A plurality of ignition grooves 52 are arranged at intervals on the flame stabilizing wall plate 52 of the ignition fire bar 5 facing the combustion fire bar 4 , and each ignition groove is connected to the combustion chamber of the corresponding combustion fire bar 4 .

[0052] The partitions 51 between adjacent ignition grooves block the air passages 7 between adjacent fire rows.

[0053] The ignition needle 61 and the flame sensing needle 62 are arranged corresponding to the ignition fire bar 5 .

[0054] Each fire row is connected to its corresponding ejector pipe, wherein each first combustion fire row 41 is connected to its corresponding first combustion ejector pipe 211, each second combustion fire row 42 is connected to its corresponding second combustion ejector pipe 212, and the ignition fire row is connected to the ignition ejector pipe 22.

[0055] The gas distribution pipe 3 is used to distribute the gas sent from the gas pipeline to each ejector pipe, and is arranged on the front cover plate of the shell or between the side plates connected to both sides of the shell; it includes a body 35 and nozzles 36 arranged on the body 35 corresponding to each ejector pipe. The nozzles 36 include four first nozzles 361 corresponding to each first ejector pipe, seven second nozzles 362 corresponding to each second ejector pipe, and a pilot nozzle 363 corresponding to the pilot ejector pipe.

[0056] The body 35 includes a cover body 351 and a base body 352 that are butted against each other. After the cover body 351 and the base body 352 are butted against each other, a cavity 37 is defined between the two.

[0057] The cover body 351 is provided with a first channel 31, a second channel 32 and an ignition channel 33 connected to the gas pipeline; the first channel 31 is provided with a first solenoid valve (not shown in the figure), the second channel 32 is provided with a second solenoid valve (not shown in the figure), and the ignition channel 33 is provided with an ignition solenoid valve 73.

[0058] Each nozzle is arranged on the base 325, wherein the first combustion nozzle and the second combustion nozzle are arranged in a row corresponding to the combustion ejection tube. The upper edge of the base 352 is partially convex to form a convex block 354, and the ignition nozzle 363 is arranged on the convex block 354, and the ignition nozzle 363 is perpendicular to each combustion nozzle.

[0059] Corresponding to the second nozzle 362, a plurality of annular first flanges 353 are provided on the inner side surface of the base 352 facing the cover body 351. These first flanges 353 are sealed and connected to the inner wall of the cover body 351 to isolate the cavity 37 between the cover body 351 and the main body 352. The second channel 32 connects the space enclosed by each first flange 353, thereby connecting each second nozzle 362.

[0060] The first channel 31 on the cover body is connected to each first nozzle 361 through the cavity 37 .

[0061] The ignition passage 33 is connected to the ignition nozzle 363 .

[0062] In this embodiment, a pressing plate 355 is further arranged between the cover 351 and the base 352. The pressing plate 355 is provided with a first through hole 31' corresponding to the first channel 31, a second through hole 32' corresponding to the second channel, and an ignition through hole 33' corresponding to the ignition channel. Each first flange is sealed to the pressing plate 355.

[0063] A second annular flange 358 is further provided on the side wall of the base 352 facing the cover body 351 . The second flange 358 is sealed to the pressure plate 355 . The inner cavity of the second flange 358 is independent of the cavity 37 and communicates with the ignition channel 33 and the ignition nozzle 22 .

[0064] A first sealing gasket 356 and a second sealing gasket 357 are respectively provided between the pressing plate 355 and the cover body 351 and between the pressing plate 355 and the base body 352 to further ensure the sealing requirements and reduce the processing accuracy of the parts.

[0065] When the burner is working, the control system of the burner opens the ignition solenoid valve, the first solenoid valve and / or the second solenoid valve, the gas enters the ignition nozzle through the ignition channel, the air blown in by the blower enters the ignition ejector tube together with the gas in the ignition nozzle, and is ejected from the ignition fire exhaust; the ignition needle ignites to ignite the gas ejected from the ignition fire exhaust.

[0066] At the same time, the gas is ejected from the gas nozzle, carrying the surrounding air into the combustion ejector tube, and ejected from the combustion fire bar. The flames on the ignition fire bar ignite the gas on each combustion fire bar through each ignition groove, and each combustion fire bar is ignited at the same time, with a fast fire transmission speed.

[0067] The ignition solenoid valve can be normally open or closed after the ignition is completed according to the design; closing the ignition solenoid valve helps to further improve the heating uniformity of the heat exchanger.

[0068] When the first solenoid valve is opened and the second solenoid valve is closed, the first group of combustion fire grates works, and the burner is in the first stage; when the first solenoid valve is closed and the second solenoid valve is opened, only the second group of combustion fire grates works, and the burner is in the second stage; when the first and second solenoid valves are opened at the same time, all the combustion fire grates work, and the burner is in the third stage.

[0069] Since the ignition fire bars cover all the combustion fire bars, the first combustion fire bars in the first group of combustion fire bars can be arranged relatively evenly along the length direction of the shell cavity; similarly, the second combustion fire bars can be arranged in this way so that the corresponding heat exchanger can be heated evenly; and the air from each air channel can be fully utilized, effectively reducing the fan noise; at the same time, the spacing between each fire bar can be designed according to the ideal air supply requirements, and is no longer limited by the ignition; it makes the combustion more complete and the combustion efficiency higher, greatly reduces the generation of incomplete combustion products such as NOx, and is environmentally friendly.

Claims

1. A burner, comprising a shell (1) and a plurality of fire bars arranged in the shell (1), each of the fire bars being connected to a corresponding ejector tube, and the shell (1) is further provided with a gas distribution pipe (3) and an ignition needle (61) corresponding to each of the ejector tubes; Features: The fire bars include a plurality of combustion fire bars (4) and an ignition fire bar (5); the combustion fire bars (4) are arranged in sequence along the length direction of the shell, and the gaps between adjacent combustion fire bars form air passages (7); The ignition fire bar (5) is arranged in the shell perpendicular to each of the combustion fire bars (4), and the length of the ignition fire bar (5) is adapted to the length of the inner cavity of the shell to correspond to all the combustion fire bars; The ignition needle (61) is arranged corresponding to the ignition fire bar (5).

2. The burner according to claim 1, characterized in that Flame-stabilizing wall panels (44, 54) are provided on opposite side edges of the fire hole panels (43, 53) of each fire bar, and the flame-stabilizing wall panels (44, 54) are higher than the corresponding fire hole panels (43, 53); a combustion chamber (45) is formed between the two flame-stabilizing wall panels on each combustion fire bar, and an ignition chamber (55) is formed between the two flame-stabilizing wall panels on the ignition fire bar; A plurality of ignition grooves (52) facing each of the combustion fire bars (4) are arranged at intervals on the flame stabilizing wall plate (54) of the ignition fire bar (5) facing the combustion fire bar (4), and the combustion chamber (45) on the combustion fire bar and the ignition chamber (55) on the ignition fire bar are connected through the ignition grooves (52).

3. The burner according to claim 1 or 2, characterized in that Each of the combustion fire bars (4) is divided into two groups, including a first group of combustion fire bars consisting of a plurality of first combustion fire bars (41) and a second group of combustion fire bars consisting of a plurality of second combustion fire bars (42); each of the first combustion fire bars is stacked and arranged along the center of the inner cavity of the shell, and each of the first combustion fire bars (41) is adjacent to the second combustion fire bars (42).

4. The burner according to claim 3, characterized in that The second group of combustion fire bars has an odd number of second combustion fire bars (42), one of which is arranged at the center of the inner cavity of the shell, and the remaining second combustion fire bars are symmetrically arranged relative to the center of the inner cavity of the shell.

5. The burner according to claim 3, characterized in that The gas distribution pipe (3) comprises a body (35) and nozzles (36) arranged on the body (35) and corresponding to the ejector pipes; The main body (35) is provided with an ignition channel (33) connected to an ignition nozzle (363) corresponding to the ignition ejection tube, a first channel (31) connected to each first nozzle (361) corresponding to the first group of combustion fire bars, and a second channel (32) connected to each second nozzle (362) corresponding to the second group of combustion fire bars; The first channel (31), the second channel (32) and the ignition channel (33) are independent of each other; The ignition channel (33) is provided with an ignition electromagnetic valve (73), the first channel (31) is provided with a first electromagnetic valve, the second channel (32) is provided with a second electromagnetic valve, and the ignition channel (33), the first channel (31) and the second channel (32) are opened and closed.

6. The burner according to claim 5, characterized in that The body (35) comprises a cover body (351) and a base body (352); after the cover body (351) and the base body (352) are butt-jointed, a cavity (37) is formed between the two. The first channel (31), the second channel (32) and the ignition channel (33) are arranged on the cover body (351); each of the nozzles (36) is arranged on the base body (352); Corresponding to the second nozzle (362), a plurality of annular first flanges (353) are provided on the inner side surface of the base (352) facing the cover (351), and the first flanges (353) are all sealedly connected to the inner side wall of the cover (351), so that the inner cavity of the first flange is independent of the cavity (37); The second channel (32) is connected to the inner cavity of each first flange (353), thereby connecting to each second nozzle (362); The first channel (31) on the cover body is connected to each of the first nozzles (361) through the cavity (37); The ignition passage (33) is connected to the ignition nozzle (363).

7. The burner according to claim 6, characterized in that The upper edge of the base (352) is partially convex to form a convex block (354), and the ignition nozzle (363) is arranged on the convex block (354); the outlet direction of the ignition nozzle (363) is perpendicular to the outlet direction of each combustion nozzle; The first nozzle (361) and the second nozzle (362) are arranged in a row.

8. The burner according to claim 6, characterized in that A pressing plate (355) is further provided between the cover body (351) and the base body (352); the pressing plate (355) is provided with a first through hole (31') corresponding to the first channel (31), a second through hole (32') corresponding to the second channel, and an ignition through hole (33') corresponding to the ignition channel; Each of the first flanges is sealingly connected to the pressure plate (355).

9. The burner according to claim 8, characterized in that A first sealing gasket (356) is provided between the pressing plate (355) and the cover body (351), and a second sealing gasket (357) is provided between the pressing plate (355) and the base body (352).

10. The burner according to claim 9, characterized in that A second annular flange (358) is also provided on the side wall of the base (352) facing the cover body (351); the second flange (358) is sealedly connected to the pressure plate (355); the inner cavity of the second flange (358) is independent of the cavity (37) and is connected to the ignition channel (33) and the ignition nozzle (363).

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