Fire cover assembly for combustor

Abstract

The fire cover assembly comprises an outer cover body, a gas outlet part is arranged on the outer cover body, the lower end of the gas outlet part penetrates through the bottom of the outer cover body, and the upper end of the gas outlet part penetrates through the outer side wall or the top of the outer cover body; the inner cover body is arranged on an inner ring of the outer cover body, an outer ring air cavity with a downward opening and an annular gap with an upward opening or an inclined upward opening are formed between the outer cover body and the inner cover body, the annular gap is located above the outer ring air cavity, and the lower end of the annular gap is communicated with the outer ring air cavity. According to the fire cover assembly, the fire shape of circular seam fire can be complete, uniform and attractive, and the flame leaving working condition does not exist.

Description

Technical Field

[0001] The utility model relates to the technical field of burners, in particular to a fire cover assembly for a burner. Background Art

[0002] Commercially available fire holes are formed by partially removing material from the fire cover, with additional material used as support. These holes, such as round fire holes and slotted fire holes, can be used to control the size, shape, and position of the fire holes, making them widely used. However, if the annular gap fire is also supported by material, the fire shape is incomplete. Drilling holes in this supporting material creates a gap, resulting in an incomplete annular gap fire. Furthermore, because the flames are not connected, the flames closest to the supporting material are separated, resulting in an uneven, jagged flame. Summary of the Invention

[0003] The present invention aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the present invention proposes a fire cover assembly for a burner, which has a simple structure and can make the fire shape of the annular seam fire complete, uniform and beautiful without flame separation.

[0004] According to the above-mentioned fire cover assembly for a burner, it is implemented by the following technical solutions:

[0005] A fire cover assembly for a burner comprises: an outer cover body, on which an air outlet is provided, the lower end of the air outlet passes through the bottom of the outer cover body, and the upper end passes through the outer side wall or top of the outer cover body; and an inner cover body, which is arranged in the inner ring of the outer cover body, and an outer ring air cavity opening downward and an annular gap opening upward or obliquely upward are formed between the outer cover body and the inner cover body, the annular gap is located above the outer ring air cavity and its lower end is connected to the outer ring air cavity.

[0006] In some embodiments, a lower outer inclined surface is provided at the upper end of the outer side wall of the outer cover body, which is inclined from top to bottom and inward, and the upper end of the air outlet portion passes through the lower outer inclined surface; and / or a positioning groove is recessed at the lower end of the outer side wall of the outer cover body, which is open downward and outward.

[0007] In some embodiments, the air outlet portion includes a plurality of fire outlet holes, which are spaced apart along the circumference of the outer cover body. The lower ends of the fire outlet holes pass through the bottom of the outer cover body, and the upper ends pass through the lower outer inclined surface.

[0008] In some embodiments, the air outlet portion further includes an annular fire groove, which is concavely provided on the lower outer inclined surface, and the upper ends of the plurality of fire outlet holes are respectively connected to the annular fire groove.

[0009] In some embodiments, an upper outer slope is formed on the outer side wall of the inner cover body, which is tilted from top to bottom and inward. The upper outer slope is located above the inner side of the lower outer slope, and the outlet of the annular gap is located between the lower outer slope and the upper outer slope.

[0010] In some embodiments, the annular gap is arranged from bottom to top and tilted outward; and / or a fire transmission part is provided on the inner cover body, and the fire transmission part is connected to the outer ring air cavity and / or the annular gap.

[0011] In some embodiments, the inner cover body includes an inner annular wall and an annular top wall, the annular top wall is arranged above the outer cover body, and the annular gap is formed between the annular top wall and the outer cover body, the inner annular wall is arranged on the inner ring of the outer cover body and its upper end is fixedly connected to the annular top wall, and the outer ring air cavity is formed by the annular top wall, the inner annular wall and the outer cover body.

[0012] In some embodiments, a fire divider is further included, wherein the fire divider is provided with an upwardly opening gas mixing chamber, and at least one air inlet is provided at the bottom of the fire divider. The inner cover body and the outer cover body are respectively arranged on the inner and outer side walls of the fire divider, and the gas mixing chamber is respectively communicated with the air inlet, the air outlet and the outer ring air cavity.

[0013] In some embodiments, the upper end of the inner wall of the fire divider is inserted into the outer ring air cavity and is sealed with the inner cover body, and the upper end of the outer wall of the fire divider is inserted into the positioning groove of the outer cover body and is sealed with the outer cover body.

[0014] In some embodiments, the inner cover body is riveted to the inner side wall of the fire divider or is detachably connected via fasteners; the outer cover body is riveted to the fire divider or is detachably connected via fasteners.

[0015] In some embodiments, a plurality of mounting holes are provided at the bottom of the ignition divider, which are arranged circumferentially and communicate with the gas mixing chamber. A downwardly extending fixing column is provided at a position on the bottom of the outer cover body corresponding to the mounting holes. The fixing column extends into the gas mixing chamber, and the fastener passes through the mounting hole from bottom to top and is securely connected to the fixing column.

[0016] In some embodiments, the number of the air inlets is no less than three, and all of the air inlets are evenly spaced circumferentially along the bottom of the ignition divider. A downward-extending blocking portion is fixedly provided at the position of the bottom of the ignition divider corresponding to the air inlet, and the blocking portion is located radially outside the air inlet and abuts or connects to the air inlet.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] 1. The fire cover assembly of the utility model forms an outer ring air cavity and an annular gap through the cooperation of the outer cover body and the inner cover body. The mixed gas ignites and burns in the annular gap to form an annular gap fire. The fire shape of the annular gap fire is complete, uniform, and beautiful, and there is no flame separation condition.

[0019] 2. By setting an air outlet on the outer cover body, the air outlet is located outside the outer ring air cavity, which increases the intensity of the fire hole and improves the combustion load. At the same time, it can reduce the interference between the air outlet and the mixed gas required for combustion in the annular gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of the fire cover assembly in Example 1 of the present utility model;

[0021] Figure 2 It is a cross-sectional view of the fire cover assembly in Example 1 of the present utility model;

[0022] Figure 3 This is an exploded view of the fire cover assembly in Example 1 of the present utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the fire cover assembly in Example 2 of the present utility model. Figure 1 ;

[0024] Figure 5 This is a schematic diagram of the structure of the fire cover assembly in Example 2 of the present utility model. Figure 2 ;

[0025] Figure 6 This is a cross-sectional view of the fire cover assembly in Example 2 of the present utility model. Figure 1 ;

[0026] Figure 7 This is a cross-sectional view of the fire cover assembly in Example 2 of the present utility model. Figure 2 .

[0027] In the figure: 1-outer cover body, 111-lower outer bevel, 112-lower inner bevel, 12-positioning groove, 131-fire hole, 132-annular fire groove, 14-fixing column;

[0028] 2-inner cover body, 201-outer ring air cavity, 202-annular gap, 21-annular top wall, 211-upper outer slope, 212-fire transmission part, 213-lower plane, 214-upper inner slope, 22-inner ring wall;

[0029] 3- ignition distributor, 31- air mixing chamber, 32- air inlet, 33- secondary air channel, 34- blocking part, 35- mounting hole. DETAILED DESCRIPTION

[0030] The following examples illustrate the present invention, but the present invention is not limited by these examples. Modifications to the specific embodiments of the present invention or equivalent replacements of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed in the present invention.

[0031] Example 1

[0032] refer to Figure 1-3 This embodiment provides a fire cover assembly for a burner, comprising an outer cover body 1 and an inner cover body 2 that are independent of each other, wherein an air outlet portion (not shown in the figure) is provided on the outer cover body 1, the lower end of the air outlet portion passes through the bottom of the outer cover body 1, and the upper end passes through the outer wall or top of the outer cover body 1, so that when the mixed gas flows out from the air outlet portion and is ignited, an outer circle fire is formed.

[0033] The inner cover body 2 is arranged on the inner ring of the outer cover body 1, and an outer ring air cavity 201 opening downward and an annular gap 202 opening upward or obliquely upward are formed between the outer cover body 1 and the inner cover body 2. The outer ring air cavity 201 is located in the inner periphery of the gas outlet portion, and the annular gap 202 is located above the outer ring air cavity 201 and the gas outlet portion, and its lower end is connected to the outer ring air cavity 201. In this way, when the mixed gas in the outer ring air cavity 201 flows out from the annular gap 202 and is ignited, an inner ring fire is formed. The inner ring fire is an annular gap fire, which is located in the inner ring of the outer ring fire. It can be seen that the fire cover assembly has two circles of fire, which increases the strength of the fire hole and improves the combustion load. At the same time, the fire shape of the annular gap fire (i.e., the inner ring fire) is complete, uniform, and beautiful, and there is no flame separation condition. Since the gas outlet portion and the annular gap are arranged at intervals, it is beneficial to reduce the interference between the mixed gas required for combustion of the gas outlet portion and the annular gap.

[0034] refer to Figure 1-2 A lower outer bevel 111 and a vertical surface are formed at the upper and lower ends of the outer wall of the outer cover body 1, that is, a lower outer bevel 111 is provided at the upper end of the outer wall of the outer cover body 1, which is arranged from top to bottom and tilted inward. The upper end of the air outlet passes through the lower outer bevel 111, so that the lower outer bevel 111 can guide the flame burning at the air outlet. That is, when the mixed gas burns at the outlet of the air outlet, the burning flame can spread obliquely upward along the lower outer bevel 111, which is beneficial to increase the flame area of ​​the outer ring fire, thereby increasing the heating efficiency. A downward and outward-opening positioning groove 12 is recessed at the lower end of the outer wall of the outer cover body 1, that is, a downward and outward-opening positioning groove 12 is recessed on the vertical surface. The positioning groove 12 is configured to limit and fix the fire divider and also to form a planar sealing contact with the fire divider.

[0035] Furthermore, the specific structure of the air outlet includes but is not limited to any of the following:

[0036] The first type involves the air outlet portion comprising a plurality of fire holes 131 spaced apart circumferentially along the outer cover body 1. The lower end of each fire hole 131 extends through the bottom of the outer cover body 1, while the upper end of each fire hole extends through the lower outer inclined surface 111. This results in an outer ring of flames formed at the plurality of fire holes 131. However, due to the spacing between the fire holes 131, the flames of the outer ring may not connect, resulting in an uneven outer ring of flames.

[0037] See also Figure 1-3 , the second type, the air outlet portion includes a plurality of fire holes 131 and an annular fire groove 132, an annular fire groove 132 opening toward the radial outside is recessed on the lower outer inclined surface 111, and a plurality of fire holes 131 opening toward the bottom are circumferentially spaced at the lower end of the outer cover body 1, and the upper ends of the plurality of fire holes 131 are respectively connected to the annular fire groove 132. In this embodiment, the fire holes 131 are arranged vertically, and the annular fire groove 132 is arranged from bottom to top and tilted outward. It can be seen that by recessing the annular fire groove 132 on the outer side wall of the outer cover body 1, the upper ends of the plurality of fire holes 131 are connected to the external atmosphere through the annular fire groove 132. At this time, the outer ring fire is formed at the annular fire groove 132, and forms an annular seam fire, which ensures that the outer ring fire is an annular seam fire, and the fire shape is complete, uniform, and beautiful, and there is no flame separation condition.

[0038] refer to Figure 3 Furthermore, a plurality of fixing columns 14 arranged circumferentially at intervals are provided at the bottom of the outer cover body 1. Each fixing column 14 is integrally formed with the outer cover body 1 and is used to be connected and fixed to the fire cover or flame distributor of the burner, so that the outer cover body 1 can be stably and reliably detachably connected to the fire cover or flame distributor of the burner.

[0039] refer to Figure 1-3 An upper outer bevel 211 is formed on the outer sidewall of the inner cover body 2, sloping downward and inward. The upper outer bevel 211 is located above and inside the lower outer bevel 111. The outlet of the annular gap 202 is located between the lower outer bevel 111 and the upper outer bevel 211. This allows the upper outer bevel 211 to guide the flames of the inner ring fire. In this embodiment, the upper outer bevel 211 and the lower outer bevel 111 have the same inclination and are located on the same inclined plane, enhancing the overall aesthetics.

[0040] Furthermore, the annular gap 202 is arranged to be tilted upward and outward from bottom to top, so that the air outlet direction of the annular gap is radially outward. In this embodiment, the annular gap 202 is formed by the lower inner bevel 112 and the upper inner bevel 214 arranged in parallel and opposite each other. This helps to ensure that the annular gap fire formed at the annular gap 202 has a complete, uniform, and beautiful fire shape. The lower inner bevel 112 is arranged at the upper end of the inner side wall of the outer cover body 1 and is tilted upward and outward from bottom to top. The upper inner bevel 214 is arranged at the bottom of the annular top wall 21 of the inner cover body 2 and is tilted upward and outward from bottom to top.

[0041] refer to Figure 1-3 A flame transfer portion 212 is provided on the inner cover body 2. This portion communicates with the outer ring air cavity 201 and / or the annular gap 202. This facilitates the transfer of flames from the flame transfer portion 212 to the annular gap 202, igniting the mixed gas ejected from the annular gap 202, which in turn ignites the mixed gas flowing out of the gas outlet. In this embodiment, the flame transfer portion 212 is composed of a plurality of flame transfer holes. The lower ends of most of these flame transfer holes communicate with the annular gap 202, while the lower ends of a smaller number of these flame transfer holes communicate with the outer ring air cavity 201.

[0042] Furthermore, the inner cover body 2 includes an inner annular wall 22 and an annular top wall 21 extending outward from the upper end of the inner annular wall 22. The annular top wall 21 is disposed above the outer cover body 1, and an annular gap 202 is formed between the annular top wall 21 and the outer cover body 1. The inner annular wall 22 is disposed on the inner circle of the outer cover body 1, and its upper end is fixedly connected to the inner end of the annular top wall 21. The outer ring air cavity 201 is formed by the inner end of the annular top wall 21, the inner annular wall 22, and the lower end of the inner side wall of the outer cover body 1. In this embodiment, the upper outer bevel 211 is arranged on the outer side wall of the annular top wall 21, and the fire transfer portion 212 is arranged on the annular top wall 21. A lower plane 213 and an upper inner bevel 214 set at an obtuse angle are formed on the bottom surface of the annular top wall 21. The upper inner bevel 214 constitutes the top cavity wall surface of the outer ring air cavity 201. The upper inner bevel 214 is connected between the lower plane 213 and the upper outer bevel 211 and is arranged from bottom to top and outward. The upper inner bevel 214 constitutes the upper side wall surface of the annular gap 202.

[0043] Example 2

[0044] refer to Figure 4-7The difference between this embodiment and embodiment 1 is that the fire cover assembly further includes a fire divider 3, which is provided with an upwardly opening gas mixing chamber 31, and at least one air inlet 32 ​​is provided at the bottom of the fire divider 3. The inner cover body 2 and the outer cover body 1 are respectively provided on the inner and outer side walls of the fire divider 3, and the gas mixing chamber 31 is respectively connected to the air inlet 32, the air outlet portion, and the outer ring air chamber 201. Thus, by providing the fire divider 3, the inner cover body 2 and the outer cover body 1, which are independently arranged from each other, are stably and reliably mounted on the fire divider, and a stable and reliable annular gap 201 is ensured to be formed between the inner cover body 2 and the outer cover body 1. In addition, the same fire divider is used to supply air to the air outlet portion on the outer cover body 1 and the outer ring air chamber between the inner and outer cover bodies.

[0045] Furthermore, there are multiple air inlets 32, and the multiple air inlets 32 are evenly arranged at circumferential intervals along the bottom of the ignition divider 3. The lower end of each air inlet 32 ​​extends downward to the bottom of the ignition divider 3, and a secondary air channel 33 for secondary air to pass through is formed between adjacent air inlets 32, so as to supplement the secondary air required for combustion for the burner through the secondary air channel, thereby improving the completeness of combustion.

[0046] refer to Figure 6-7 In this embodiment, the upper end of the inner wall of the ignition divider 3 is inserted into the outer ring air cavity 201 and is sealed with the inner cover body 2 to ensure airtightness between the ignition divider and the inner cover body. The upper end of the outer wall of the ignition divider 3 is inserted into the positioning groove 12 of the outer cover body 1 and is sealed with the outer cover body 1 to ensure airtightness between the ignition divider and the outer cover body.

[0047] Furthermore, the inner cover body 2 is riveted to the inner side wall of the fire divider 3 or is detachably connected by fasteners, so that the inner cover body and the fire divider are connected as one. The outer cover body 1 is riveted to the fire divider 3 or is detachably connected by fasteners (such as screws), so that the outer cover body and the fire divider are connected as one. In particular, the fire divider 3 can also be designed to be unconnected and fixed to the inner cover body and the outer cover body respectively. In this case, the inner cover body is directly placed on the inner side wall of the fire divider 3, and the outer cover body is also directly placed on the outer side wall of the fire divider.

[0048] Taking the example of the removable connection between the outer cover body 1 and the ignition divider 3 via fasteners (e.g., screws), a plurality of mounting holes 35 are provided at the bottom of the ignition divider 3, spaced circumferentially and communicating with the gas mixing chamber 31. A downwardly extending fixing post 14 is integrally formed at the bottom of the outer cover body 1 at positions corresponding to the mounting holes 35. The fixing post 14 extends into the gas mixing chamber 31, and the fasteners pass through the mounting holes 35 from bottom to top and are securely connected to the fixing post 14. In this embodiment, the number of mounting holes 35 is equal to the number of air inlets 32. The air inlets 32 and the mounting holes 35 are staggered circumferentially. The upper end of each mounting hole 35 extends upward to above the bottom surface of the gas mixing chamber 31 and abuts against the bottom of the fixing post 14.

[0049] In this embodiment, there are four mounting holes 35 and four air inlets 32, though three or five could also be used. A downwardly extending blocking portion 34 is fixedly disposed at the bottom of the ignition divider 3, corresponding to the air inlet 32. The blocking portion 34 is located radially outward from the air inlet 32 ​​and abuts or connects to it. In this embodiment, the arc length of the blocking portion 34 is greater than the arc length of the air inlet 32. Air inlets are formed between adjacent blocking portions 34, and are connected to the secondary air passage 33. Thus, the blocking portion 34 conceals the air inlet radially inward of the blocking portion without affecting the passage of secondary air. Furthermore, the blocking portion prevents liquid overflowing along the outer wall of the ignition divider from flowing into the air inlet 32.

[0050] The above descriptions are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A fire cover assembly for a burner, characterized in that: include: An outer cover body (1), wherein an air outlet portion is provided on the outer cover body (1), wherein the lower end of the air outlet portion passes through the bottom of the outer cover body (1), and the upper end of the air outlet portion passes through the outer side wall or top of the outer cover body (1); and The inner cover body (2) is arranged on the inner ring of the outer cover body (1), and an outer ring air cavity (201) opening downward and an annular gap (202) opening upward or obliquely upward are formed between the outer cover body (1) and the inner cover body (2). The annular gap (202) is located above the outer ring air cavity (201) and its lower end is connected to the outer ring air cavity (201).

2. A fire cover assembly for a burner according to claim 1, characterized in that: A lower outer inclined surface (111) is provided at the upper end of the outer side wall of the outer cover body (1), which is arranged from top to bottom and tilted inward, and the upper end of the air outlet portion passes through the lower outer inclined surface (111); and / or a positioning groove (12) is provided at the lower end of the outer side wall of the outer cover body (1), which is downward and outwardly open.

3. A fire cover assembly for a burner according to claim 2, characterized in that: The gas outlet portion includes a plurality of fire outlet holes (131), and the plurality of fire outlet holes (131) are arranged at intervals along the circumference of the outer cover body (1). The lower ends of the fire outlet holes (131) pass through the bottom of the outer cover body (1), and the upper ends pass through the lower outer inclined surface (111).

4. A fire cover assembly for a burner according to claim 3, characterized in that: The gas outlet portion further comprises an annular fire groove (132), the annular fire groove (132) being recessed on the lower outer inclined surface (111), and the upper ends of the plurality of fire outlet holes (131) are respectively connected to the annular fire groove (132).

5. A fire cover assembly for a burner according to claim 2, characterized in that: An upper outer bevel (211) is formed on the outer side wall of the inner cover body (2) and is arranged from top to bottom and tilted inward. The upper outer bevel (211) is located above the inner side of the lower outer bevel (111), and the outlet of the annular gap (202) is located between the lower outer bevel (111) and the upper outer bevel (211).

6. A fire cover assembly for a burner according to claim 1, characterized in that: The annular gap (202) is arranged from bottom to top and tilted outward; and / or a fire transmission portion (212) is provided on the inner cover body (2), and the fire transmission portion (212) is connected to the outer ring air cavity (201) and / or the annular gap (202).

7. A fire cover assembly for a burner according to any one of claims 1 to 6, characterized in that: The inner cover body (2) includes an inner ring wall (22) and an annular top wall (21), the annular top wall (21) is arranged above the outer cover body (1), and the annular gap (202) is formed between the annular top wall (21) and the outer cover body (1), the inner ring wall (22) is arranged on the inner ring of the outer cover body (1) and its upper end is fixedly connected to the annular top wall (21), and the outer ring air cavity (201) is formed by the annular top wall (21), the inner ring wall (22) and the outer cover body (1).

8. A fire cover assembly for a burner according to any one of claims 1 to 6, characterized in that: The invention also includes a fire divider (3), wherein the fire divider (3) is provided with an upwardly opening gas mixing chamber (31), and at least one air inlet (32) is provided at the bottom of the fire divider (3). The inner cover body (2) and the outer cover body (1) are respectively arranged on the inner and outer side walls of the fire divider (3), and the gas mixing chamber (31) is respectively connected with the air inlet (32), the air outlet portion and the outer ring air chamber (201).

9. A fire cover assembly for a burner according to claim 8, characterized in that: The upper end of the inner wall of the ignition divider (3) is inserted into the outer ring air cavity (201) and is sealed with the inner cover body (2); the upper end of the outer wall of the ignition divider (3) is inserted into the positioning groove (12) of the outer cover body (1) and is sealed with the outer cover body (1).

10. A fire cover assembly for a burner according to claim 8, characterized in that: The inner cover body (2) is riveted to the inner side wall of the fire distributor (3) or is detachably connected via fasteners; the outer cover body (1) is riveted to the fire distributor (3) or is detachably connected via fasteners.

11. A fire cover assembly for a burner according to claim 10, characterized in that: A plurality of mounting holes (35) are provided at the bottom of the ignition distributor (3) and are arranged at circumferential intervals and communicated with the gas mixing chamber (31). A downwardly extending fixing column (14) is provided at a position on the bottom of the outer cover body (1) corresponding to the mounting holes (35). The fixing column (14) extends into the gas mixing chamber (31). The fastener passes through the mounting holes (35) from bottom to top and is fixedly connected to the fixing column (14).

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