Fire cover and combustor

Abstract

A fire hole is provided with a plurality of fire hole units which are sequentially communicated in the radial direction of the fire cover, and each fire hole unit comprises a first branch, a second branch and a third branch; the first branch and the third branch are linear sections extending in the radial direction of the fire cover, the second branch is a bent section bent towards the radial inner side of the fire cover, and two ports of the second branch face the radial outer side of the fire cover; the outer side end of the first branch is connected and communicated with the first end of the second branch, the second end of the second branch is connected and communicated with the inner side end of the third branch, the outer side end of the third branch is located on the side, facing the radial outer side of the fire cover, of the inner side end of the first branch, and the outer side end of the third branch is connected and communicated with the first branch. When the gas flows reversely, the flowing directions of the gas in the second branch, the first branch and the third branch are opposite to generate opposite impact, the gas in the second branch can prevent the gas in the first branch or the third branch from continuously flowing towards the radial inner side of the burner cap, and backfire of the burner is prevented.

Description

Technical Field

[0001] The present invention relates to the field of stoves, and in particular to a fire cover and a burner. Background Art

[0002] Gas stove flashback refers to a combustion phenomenon in which the flame retracts into the stove's interior, causing a "deflagration" of the flame. Prior art methods typically mitigate flashback by adjusting the damper, unclogging the flame holes, replacing the flame cover, improving the distance between the pot bottom and the flame cover, cleaning the stove, and inspecting the gas lines. Technicians have also attempted to mitigate flashback by modifying the flame hole structure. Currently, this is typically achieved by reducing the diameter, increasing the depth, or extending the path of the flame holes. However, these methods can only alleviate flashback to a limited extent and are generally ineffective, failing to completely resolve the issue. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a fire cover and a burner in order to overcome the defect in the prior art that the flashback of a gas stove is generally alleviated by reducing the diameter of the fire hole, increasing the depth of the fire hole, etc.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] A fire cover, comprising a fire cover body and a fire hole, wherein an air mixing chamber is provided inside the fire cover body, and the fire hole is provided in the fire cover body. One end of the fire hole in the radial direction of the fire cover penetrates into the air mixing chamber, and the other end of the fire hole in the radial direction of the fire cover penetrates the outer peripheral wall of the fire cover body. The fire hole has a plurality of fire hole units that are sequentially connected along the radial direction of the fire cover, and the fire hole units include a first branch, a second branch, and a third branch.

[0006] The first branch and the third branch are both straight segments extending radially along the fire cover, the second branch is a curved segment curved toward the radial inside of the fire cover, and both ends of the second branch are directed toward the radial outside of the fire cover;

[0007] Define that the end of the first branch and the third branch facing radially outward from the fire cover is the outer end, and the end facing radially inward from the fire cover is the inner end; the outer end of the first branch is connected to and communicated with the first end of the second branch, the second end of the second branch is connected to and communicated with the inner end of the third branch, the outer end of the third branch is located on the side of the inner end of the first branch facing radially outward from the fire cover, and the outer end of the third branch is connected to and communicated with the first branch.

[0008] In this solution, when the gas flows normally, that is, from the radially inner side of the fire cover to the radially outer side of the fire cover, the gas can flow directly along the straight section of the first and third branches, ensuring that the gas flows normally out to the radially outer side of the fire cover for combustion. When the gas flow direction becomes abnormal, that is, the gas flows from the radially outer side of the fire cover to the radially inner side of the fire cover, because both ports of the curved section of the second branch face the radially outer side of the fire cover, the gas flowing into the second branch will change its flow direction and flow from the radially inner side of the fire cover to the radially outer side of the fire cover. The flow direction of the gas in the first and third branches remains unchanged, still flowing from the radially outer side of the fire cover to the radially inner side of the fire cover. The two gas flows in opposite directions will meet at the intersection of the first and second branches or the intersection of the second and third branches. The gas in the second branch will prevent the gas in the first or third branch from continuing to flow toward the radially inner side of the fire cover, thereby effectively preventing the occurrence of burner flashback.

[0009] Preferably, the outer end of the third branch is connected to and communicates with the outer end of the first branch, and the intersection of the first branch and the third branch passes through the outer peripheral wall of the fire cover body.

[0010] In this solution, the gas in the first branch or the third branch can directly flow out of the fire cover, shortening the gas flow path and reducing harmful gas emissions.

[0011] Preferably, there are multiple fire hole units, and for two fire hole units that are adjacent in the radial direction of the fire cover, the intersection of the first branch and the third branch of the fire hole unit located radially inside the fire cover passes through the intersection of the first branch and the second branch of the fire hole unit located radially outside the fire cover, or, the intersection of the first branch and the third branch of the fire hole unit located radially inside the fire cover passes through the intersection of the second branch and the third branch of the fire hole unit located radially outside the fire cover.

[0012] In this solution, the above arrangement allows the straight sections of two adjacent fire hole units to connect directly, shortening the gas flow path and reducing harmful gas emissions. Furthermore, the intersections of the first and second branches, as well as the intersections of the second and third branches, can create a gas counterflow, thereby restricting the flow of gas from the fire hole units located radially outside the fire cover into the fire hole units located radially inside the fire cover.

[0013] Preferably, the number of the fire hole units is three or more;

[0014] For the three adjacent fire hole units in the radial direction of the fire cover, the intersection of the first branch and the third branch of the fire hole unit located in the radial middle passes through the intersection of the first branch and the second branch of the fire hole unit located in the radial outer side, and the intersection of the first branch and the third branch of the fire hole unit located in the radial inner side passes through the intersection of the second branch and the third branch of the fire hole unit located in the radial middle;

[0015] Alternatively, for the three fire hole units adjacent in the radial direction of the fire cover, the intersection of the first branch and the third branch of the fire hole unit located in the radial middle passes through the intersection of the second branch and the third branch of the fire hole unit located in the radial outer side, and the intersection of the first branch and the third branch of the fire hole unit located in the radial inner side passes through the intersection of the first branch and the second branch of the fire hole unit located in the radial middle.

[0016] In this solution, the above arrangement enables the two first branches of two fire hole units adjacent in the radial direction of the fire cover to be directly connected or the two third branches to be directly connected, thereby guiding the gas to flow from the connected branch into the second branch to change the flow direction of the gas.

[0017] Preferably, there are multiple fire hole units. For two fire hole units that are adjacent in the radial direction of the fire cover, the fire hole unit located radially outside the fire cover is defined as the first fire hole unit, and the fire hole unit located radially inside the fire cover is defined as the second fire hole unit; the outer end of the first branch of the second fire hole unit is connected to and communicated with the intersection of the second branch and the third branch of the first fire hole unit.

[0018] In this solution, the provision of multiple fire hole units increases resistance to gas flow radially inward of the fire cover, further preventing burner flashback. The outer end of the first branch of the second fire hole unit connects to the intersection of the second and third branches of the first fire hole unit, allowing gas in the first branch of a fire hole unit to flow directly into the third branch of another adjacent fire hole unit. This eliminates the second branch, shortens the gas flow path, and reduces harmful gas emissions.

[0019] Preferably, the outer end of the third branch is connected to and communicates with the outer end of the first branch;

[0020] The outer end of the third branch of the second fire hole unit is connected to and communicates with the intersection of the second branch and the third branch of the first fire hole unit.

[0021] In this solution, the above-mentioned setting can reduce the radial length of a single fire hole unit in the fire cover, making the structure of the fire hole unit more compact. Therefore, when the radial width of the fire cover is constant, a larger number of fire hole units can be set, thereby increasing the resistance of the gas to flow radially inwardly of the fire cover and effectively preventing the occurrence of burner backfire.

[0022] Preferably, the intersection of the first branch and the third branch passes through the outer peripheral wall of the fire cover body.

[0023] In this solution, the above arrangement enables the gas in the first branch or the third branch to flow directly out of the fire cover, shortening the gas flow path and reducing harmful gas emissions.

[0024] Preferably, the second branch passes through the gas mixing chamber.

[0025] In this solution, the above arrangement allows the gas to flow directly into the fire hole unit, shortening the gas flow path and reducing harmful gas emissions.

[0026] Preferably, when the number of the fire hole units in a single fire hole is an odd number, the intersection of the second branch and the third branch passes through the gas mixing chamber;

[0027] When the number of the fire hole units in a single fire hole is an even number, the intersection of the first branch and the second branch passes through the gas mixing chamber.

[0028] In this solution, the above-mentioned setting makes the flow path of the gas in the straight section flow from the first branch of one fire hole unit to the third branch of another adjacent fire hole unit, so that each fire hole unit can form a gas counter-flow when the gas flows backward, so as to increase the resistance of the gas to the radial inner side of the fire cover, and effectively prevent the occurrence of burner backfire.

[0029] Preferably, the axis of the port at the first end of the second branch coincides with the axis of the first branch, and / or the axis of the port at the second end of the second branch coincides with the axis of the third branch.

[0030] In this solution, when the gas flows from the radial outer side of the fire cover toward the radial inner side of the fire cover, the above-mentioned setting makes the direction of the gas flowing out of the second branch completely opposite to the direction of the gas in the first branch or the third branch, thereby better preventing the gas in the first branch or the third branch from continuing to flow toward the radial inner side of the fire cover, thereby effectively preventing the occurrence of burner backfire.

[0031] Preferably, there are a plurality of fire holes, and the plurality of fire holes are arranged on the fire cover body at intervals along the circumference of the fire cover;

[0032] The first branch, the second branch and the third branch of the single fire hole are located at the same circumferential position of the fire cover, and the third branch is arranged below the first branch in the axial direction of the fire cover.

[0033] In this solution, the above arrangement reduces the space occupied by a single fire hole in the circumferential direction of the fire cover, thereby being able to provide a greater number of fire holes while keeping the circumferential size of the fire cover constant, thereby improving the combustion effect.

[0034] Preferably, the fire hole further comprises an air intake section, which is a straight section extending radially along the fire cover. The air intake section is provided on a side of the fire hole unit facing radially outward of the fire cover. One end of the air intake section passes through the outer peripheral wall of the fire cover body, and the other end of the air intake section is connected to and communicates with the fire hole unit.

[0035] And / or, the fire hole also includes an air outlet section, which is a straight section extending radially along the fire cover. The air outlet section is arranged on the radial inner side of the fire hole unit toward the fire cover, and one end of the air outlet section passes through the gas mixing chamber, and the other end of the air outlet section is connected to and communicated with the fire hole unit.

[0036] In this solution, the above arrangement can reduce the space occupied by the fire holes on the outer peripheral wall and the inner peripheral wall of the fire cover body, reduce the flame propagation speed, and reduce the risk of flashback to a certain extent.

[0037] A burner comprises the fire cover as described above.

[0038] The positive and progressive effect of the present invention is that when the gas flow direction becomes abnormal, that is, when the gas flows from the radial outside of the fire cover to the radial inside of the fire cover, since the two ports of the second branch of the curved section are both facing the radial outside of the fire cover, the gas flowing into the second branch will change its flow direction and flow from the radial inside of the fire cover to the radial outside of the fire cover. The flow direction of the gas in the first branch and the third branch remains unchanged, and still flows from the radial outside of the fire cover to the radial inside of the fire cover. The two streams of gas with opposite flow directions will meet at the intersection of the first branch and the second branch or the intersection of the second branch and the third branch. The gas in the second branch will prevent the gas in the first branch or the third branch from continuing to flow toward the radial inside of the fire cover, thereby effectively preventing the occurrence of burner backfire. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Schematic diagram of the three-dimensional structure of a fire cover according to an embodiment of the present invention.

[0040] Figure 2 Schematic diagram of the internal structure of a fire cover according to an embodiment of the present invention.

[0041] Figure 3 Schematic diagram of the shape of the fire hole unit according to one embodiment of the present invention.

[0042] Figure 4 FIG. 1 is a schematic diagram of a gas flow path according to an embodiment of the present invention.

[0043] Figure 5 FIG. 1 is a schematic diagram of another shape of a fire hole according to an embodiment of the present invention.

[0044] Description of reference numerals:

[0045] Fire cover body 1

[0046] Fire Hole 2

[0047] Fire hole unit 21

[0048] 211 First Branch Road

[0049] Second Branch Road 212

[0050] 213 Third Branch Road

[0051] First fire hole unit 214

[0052] Second fire hole unit 215

[0053] The third fire hole unit 216

[0054] Fourth fire hole unit 217

[0055] Intake section 22

[0056] Exhaust section 23

[0057] Mixing chamber 3 DETAILED DESCRIPTION

[0058] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0059] like Figure 1 and Figure 2 As shown, this embodiment discloses a burner including a fire cover. The fire cover includes a fire cover body 1 and a plurality of fire holes 2. The fire cover body 1 is provided with a gas mixing chamber 3 connected to the burner's gas mixing chamber to accommodate a mixture of fuel gas and primary air. The plurality of fire holes 2 are arranged on the fire cover body 1 at intervals along the circumference of the fire cover. The fire holes 2 extend radially along the fire cover. One end of the fire hole 2 in the radial direction of the fire cover penetrates into the gas mixing chamber 3, and the other end of the fire hole 2 in the radial direction of the fire cover penetrates the outer peripheral wall of the fire cover body 1 to draw the gas in the gas mixing chamber to the outside of the fire cover body 1 for combustion.

[0060] It should be noted that the “radial extension along the fire cover” involved in this embodiment is only for the convenience of describing the general direction of the structure, and does not mean that its extension direction is completely parallel to the radial direction of the fire cover. The angle between the actual extension direction of the structure and the radial direction of the fire cover is within 90°, which belongs to the “radial extension along the fire cover” described in this embodiment.

[0061] like Figure 2 and Figure 3 As shown, a single fire hole 2 has four fire hole units 21 that are sequentially connected along the radial direction of the fire cover. Each fire hole unit 21 includes a first branch 211, a second branch 212, and a third branch 213. The first branch 211 and the third branch 213 are both straight segments extending radially along the fire cover. The second branch 212 is located at one end of the first branch 211 and the third branch 213 that faces radially inward of the fire cover. The second branch 212 is a curved segment that bends radially inward of the fire cover. Both ends of the second branch 212 face radially outward of the fire cover. The first branch 211, the second branch 212, and the third branch 213 are sequentially connected end to end to form a meandering fire hole unit 21.

[0062] Specifically, if Figure 2 and Figure 3 As shown, the radially outer end of the first branch 211 and the radially inner end of the third branch 213 facing the fire cover is defined as the outer end, and the radially inner end of the first branch 211 and the radially inner end of the third branch 213 facing the fire cover is defined as the inner end. The outer end of the first branch 211 is connected to and communicates with the first end of the second branch 212, the second end of the second branch 212 is connected to and communicates with the inner end of the third branch 213, and the outer end of the third branch 213 is connected to and communicates with the outer end of the first branch 211.

[0063] In other alternative embodiments, the outer end of the third branch 213 can also be designed to be connected and communicated with the middle part of the first branch 211, etc., so that the outer end of the third branch 213 is located on the radially outer side of the inner end of the first branch 211 toward the fire cover, and the outer end of the third branch 213 is connected and communicated with the first branch 211.

[0064] like Figure 2As shown, in this embodiment, four fire hole units 21 are defined from the radial outer side to the radial inner side of the fire cover, namely the first fire hole unit 214, the second fire hole unit 215, the third fire hole unit 216 and the fourth fire hole unit 217. Among them, the intersection of the first branch 211 and the third branch 213 of the second fire hole unit 215 passes through the intersection of the second branch 212 and the third branch 213 of the first fire hole unit 214, the intersection of the first branch 211 and the third branch 213 of the third fire hole unit 216 passes through the intersection of the first branch 211 and the second branch 212 of the second fire hole unit 215, and the intersection of the first branch 211 and the third branch 213 of the fourth fire hole unit 217 passes through the intersection of the second branch 212 and the third branch 213 of the third fire hole unit 216. As a result, the third branch 213 of the first fire hole unit 214 is directly connected to the third branch 213 of the second fire hole unit 215, the first branch 211 of the second fire hole unit 215 is directly connected to the first branch 211 of the third fire hole unit 216, and the third branch 213 of the third fire hole unit 216 is directly connected to the third branch 213 of the fourth fire hole unit 217.

[0065] like Figure 4 As shown, when the gas flows normally, that is, the gas flows from the radial inner side of the fire cover to the radial outer side of the fire cover (refer to Figure 4 (In the direction of the arrow in the fire hole 2 in the lower left corner), the gas can flow directly along the first branch 211 and the third branch 213 of the straight section to ensure that the gas flows normally to the radially outer side of the fire cover for combustion. The gas flows alternately between the first branch 211 and the third branch 213 of different fire hole units 21. Specifically, the gas flows from the first branch 211 of the fourth fire hole unit 217 into the third branch 213 of the third fire hole unit 216, flows from the third branch 213 of the third fire hole unit 216 into the first branch 211 of the second fire hole unit 215, and flows from the first branch 211 of the second fire hole unit 215 into the third branch 213 of the first fire hole unit 214, and flows out of the fire cover body 1 through the intersection of the first branch 211 and the third branch 213 of the first fire hole unit 214.

[0066] like Figure 4 As shown, when the gas flow direction is abnormal, that is, the gas flows from the radial outside of the fire cover to the radial inside of the fire cover (refer to Figure 4(See the arrow in the fire hole 2 in the upper right corner.) Because both ends of the curved second branch 212 face radially outward from the fire cover, the gas flowing into the second branch 212 changes direction, flowing from the radially inner side to the radially outer side of the fire cover. The gas flowing in the first branch 211 and the third branch 213 remains unchanged, flowing from the radially outer side to the radially inner side of the fire cover. Specifically, the gas flows into the interior of the fire cover body 1 from the intersection of the first branch 211 and the third branch 213 of the first fire hole unit 214, and is divided into two flows through the first branch 211 and the third branch 213 of the first fire hole unit 214. One stream of gas flows into the second branch 212 of the first fire hole unit 214 through the first branch 211 of the first fire hole unit 214 and changes the flow direction, and flows toward the radial outside of the fire cover. The other stream of gas flows directly along the third branch 213 of the first fire hole unit 214, still flowing toward the radial inside of the fire cover, thereby causing the gas in the third branch 213 of the first fire hole unit 214 to collide with the gas flowing out from the second branch 212 of the first fire hole unit 214. The second branch 212 of the first fire hole unit 214 will organize the gas in the third branch 213 to continue to flow toward the radial inside of the fire cover, thereby effectively preventing the occurrence of burner backfire.

[0067] The second, third, and fourth fire hole units 215, 216, and 217 all work on the same principle to prevent burner flashback. The only difference is that, in the second and fourth fire hole units 215, 217, the gas from the third branch 213 flows into the second branch 212, changing the direction of the gas flow. This causes the gas in the second branch 212 to counteract the gas in the first branch 211, preventing the gas in the first branch 211 from continuing to flow radially inward of the fire cover, thereby effectively preventing burner flashback. The gas in the third fire hole unit 216 flows in the same direction as the gas in the first unit.

[0068] Further, if Figure 2 and Figure 3 As shown, the axis of the third branch 213 of the first fire hole unit 214 coincides with the axis of the third branch 213 of the second fire hole unit 215, the axis of the first branch 211 of the second fire hole unit 215 coincides with the axis of the first branch 211 of the third fire hole unit 216, and the axis of the third branch 213 of the third fire hole unit 216 coincides with the axis of the third branch 213 of the fourth fire hole unit 217, so as to facilitate the flow of gas.

[0069] In other alternative embodiments, the number of fire hole units 21 in a single fire hole 2 can be other, at least one. Providing multiple fire hole units 21 in a single fire hole 2 results in a gas counter-flow situation within each fire hole unit 21, further increasing the resistance to gas flow radially inward of the fire cover and preventing burner flashback.

[0070] Furthermore, the axis of the port at the first end of the second branch 212 coincides with the axis of the first branch 211, and the axis of the port at the second end of the second branch 212 coincides with the axis of the third branch 213, so that the direction of the gas flowing out of the second branch 212 is completely opposite to the direction of the gas in the first branch 211 and the third branch 213, thereby better preventing the gas in the first branch 211 or the third branch 213 from continuing to flow toward the radial inner side of the fire cover, thereby effectively preventing the occurrence of burner backfire.

[0071] In other alternative embodiments, the axis of the port at the first end of the second branch 212 may also form a certain angle with the axis of the first branch 211, and / or the axis of the port at the second end of the second branch 212 may also form a certain angle with the axis of the third branch 213, so as to achieve gas counteraction.

[0072] Further, if Figure 2 As shown, the first branch 211, the second branch 212 and the third branch 213 of a single fire hole 2 are located at the same circumferential position of the fire cover, and the third branch 213 is arranged below the first branch 211 in the axial direction of the fire cover to reduce the space occupied by the single fire hole 2 in the circumferential direction of the fire cover, so that more fire holes 2 can be arranged when the circumferential size of the fire cover is constant, thereby improving the combustion effect.

[0073] In other alternative embodiments, the first branch 211 and the third branch 213 of a single fire hole 2 may also be arranged along the circumference of the fire cover.

[0074] In this embodiment, the outer end of the third branch 213 of a single fire hole unit 21 is connected to and communicates with the outer end of the first branch 211. Furthermore, for two fire hole units 21 radially adjacent to each other in the fire cover, the intersection of the first branch 211 and the third branch 213 of the fire hole unit 21 located radially inward of the fire cover passes through the intersection of the first branch 211 and the second branch 212 of the fire hole unit 21 located radially outward of the fire cover. Alternatively, the intersection of the first branch 211 and the third branch 213 of the fire hole unit 21 located radially inward of the fire cover passes through the intersection of the second branch 212 and the third branch 213 of the fire hole unit 21 located radially outward of the fire cover. This is to make the structure of the fire hole 2 more compact, shorten the gas flow path, and reduce harmful gas emissions. Furthermore, if the radial width of the fire cover is constant, a larger number of fire hole units 21 can be provided to increase the resistance to gas flow radially inward of the fire cover, effectively preventing burner flashback.

[0075] like Figure 3 As shown, the intersection of the first branch 211 and the third branch 213 passes through the outer wall of the fire cover body 1, and the intersection of the first branch 211 and the second branch 212 passes through the mixing chamber 3, so that the gas in the mixing chamber can directly flow into the first branch 211 of the fourth fire hole unit 217, and the gas in the third branch 213 of the first fire hole unit 214 can directly flow out of the fire cover, shortening the gas flow path and reducing harmful gas emissions.

[0076] In other alternative embodiments, it may also be designed so that other portions of the second branch 212 extend through the gas mixing chamber 3, such as the curved portion of the second branch 212 or the intersection of the second branch 212 and the third branch 213. Preferably, when the number of fire hole units 21 in a single fire hole 2 is an odd number, the intersection of the second branch 212 and the third branch 213 extends through the gas mixing chamber 3; and when the number of fire hole units 21 in a single fire hole 2 is an even number, the intersection of the first branch 211 and the second branch 212 extends through the gas mixing chamber 3. This allows the gas to flow along the straight line from the first branch 211 of one fire hole unit 21 to the third branch 213 of another adjacent fire hole unit 21, so that each fire hole unit 21 can form a gas counterflow when the gas flows backward, thereby increasing the resistance to the gas flowing radially inward of the fire cover and effectively preventing the burner from backfire.

[0077] In other alternative embodiments, an air inlet section 22 and / or an air outlet section 23 may be further provided on the fire hole 2. Figure 5As shown, the air inlet section 22 and the air outlet section 23 are both straight sections extending radially along the fire cover. The air inlet section 22 is provided on the radially outer side of the first fire hole unit 214 toward the fire cover. One end of the air inlet section 22 penetrates the outer peripheral wall of the fire cover body 1, and the other end of the air inlet section 22 is connected and communicated with the intersection of the first branch 211 and the third branch 213 of the first fire hole unit 214. The air outlet section 23 is provided on the radially inner side of the fourth fire hole unit 217 toward the fire cover. One end of the air outlet section 23 penetrates into the gas mixing chamber 3, and the other end of the air outlet section 23 is connected and communicated with the intersection of the first branch 211 and the second branch of the fourth fire hole unit 217. The diameter of the air inlet section 22 and / or the air outlet section 23 is smaller than the diameter of the intersection of the two branches, so as to reduce the space occupied by the fire hole 2 on the outer peripheral wall and the inner peripheral wall of the fire cover body 1, reduce the flame propagation speed, and reduce the risk of backfire to a certain extent.

[0078] This embodiment shows an inner ring fire cover. In other alternative embodiments, the structure of the fire hole 2 can also be used for an outer ring fire cover.

[0079] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in normal use of the device or component. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0080] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of the present invention.

Claims

1. A fire cover, comprising a fire cover body and a fire hole, wherein a gas mixing chamber is provided inside the fire cover body, the fire hole is provided in the fire cover body, one end of the fire hole in the radial direction of the fire cover penetrates into the gas mixing chamber, and the other end of the fire hole in the radial direction of the fire cover penetrates the outer peripheral wall of the fire cover body, characterized in that: The fire hole comprises a plurality of fire hole units which are sequentially connected along the radial direction of the fire cover, and the fire hole unit comprises a first branch, a second branch and a third branch; The first branch and the third branch are both straight segments extending radially along the fire cover, the second branch is a curved segment curved toward the radial inside of the fire cover, and both ports of the second branch are toward the radial outside of the fire cover; Define that the end of the first branch and the third branch facing radially outward from the fire cover is the outer end, and the end facing radially inward from the fire cover is the inner end; the outer end of the first branch is connected and communicated with the first end of the second branch, the second end of the second branch is connected and communicated with the inner end of the third branch, the outer end of the third branch is located on the side of the inner end of the first branch facing radially outward from the fire cover, and the outer end of the third branch is connected and communicated with the first branch.

2. The fire cover according to claim 1, characterized in that: The outer end of the third branch is connected to and communicates with the outer end of the first branch, and the intersection of the first branch and the third branch passes through the outer peripheral wall of the fire cover body.

3. The fire cover according to claim 2, characterized in that: There are multiple fire hole units. For two fire hole units adjacent in the radial direction of the fire cover, the intersection of the first branch and the third branch of the fire hole unit located radially inside the fire cover passes through the intersection of the first branch and the second branch of the fire hole unit located radially outside the fire cover, or, the intersection of the first branch and the third branch of the fire hole unit located radially inside the fire cover passes through the intersection of the second branch and the third branch of the fire hole unit located radially outside the fire cover.

4. The fire cover according to claim 3, characterized in that: The number of the fire hole units is three or more; For the three adjacent fire hole units in the radial direction of the fire cover, the intersection of the first branch and the third branch of the fire hole unit located in the radial middle part passes through the intersection of the first branch and the second branch of the fire hole unit located in the radial outer side, and the intersection of the first branch and the third branch of the fire hole unit located in the radial inner side passes through the intersection of the second branch and the third branch of the fire hole unit located in the radial middle part; Alternatively, for the three fire hole units adjacent in the radial direction of the fire cover, the intersection of the first branch and the third branch of the fire hole unit located in the radial middle passes through the intersection of the second branch and the third branch of the fire hole unit located in the radial outer side, and the intersection of the first branch and the third branch of the fire hole unit located in the radial inner side passes through the intersection of the first branch and the second branch of the fire hole unit located in the radial middle.

5. The fire cover according to claim 1, characterized in that: The second branch passes through the gas mixing chamber.

6. The fire cover according to claim 5, characterized in that When the number of the fire hole units in a single fire hole is an odd number, the intersection of the second branch and the third branch runs through the gas mixing chamber; When the number of the fire hole units in a single fire hole is an even number, the intersection of the first branch and the second branch passes through the gas mixing chamber.

7. The fire cover according to claim 1, characterized in that The axis of the port at the first end of the second branch coincides with the axis of the first branch, and / or the axis of the port at the second end of the second branch coincides with the axis of the third branch.

8. The fire cover according to claim 1, characterized in that There are multiple fire holes, and the multiple fire holes are arranged on the fire cover body at intervals along the circumference of the fire cover; The first branch, the second branch and the third branch of the single fire hole are located at the same circumferential position of the fire cover, and the third branch is arranged below the first branch in the axial direction of the fire cover.

9. The fire cover according to claim 1, characterized in that: The fire hole further comprises an air intake section, which is a straight line section extending radially along the fire cover, and is arranged on a side of the fire hole unit facing the radial outer side of the fire cover, one end of the air intake section penetrates the outer peripheral wall of the fire cover body, and the other end of the air intake section is connected and communicated with the fire hole unit; And / or, the fire hole also includes an air outlet section, which is a straight line section extending radially along the fire cover, and the air outlet section is arranged on the radial inner side of the fire hole unit toward the fire cover, one end of the air outlet section penetrates into the gas mixing chamber, and the other end of the air outlet section is connected to and communicated with the fire hole unit.

10. A burner, characterized in that: The burner comprises a fire cover as claimed in any one of claims 1-9.

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