Outer ring fire cap and burner

Abstract

An outer ring fire cover and a burner, the outer ring fire cover comprising: a fire cover body having a ring-shaped top wall, an inner ring wall and an outer ring wall, the ring-shaped top wall, the inner ring wall and the outer ring wall jointly forming a ring-shaped gas mixing cavity, the ring-shaped top wall being provided with ring slits extending in a circumferential direction and communicating with the ring-shaped gas mixing cavity, the ring slits being at least two and being distributed in a radial direction; an upper surface or / and a lower surface of the ring-shaped top wall being provided with radially extending radial ribs extending in an inner-outer direction, the radial ribs being at least two and being distributed in a circumferential direction, adjacent two radial ribs separating each ring slit into a corresponding fire outlet hole; for two ring slits adjacent in a radial direction, a ring slit located at an inner side being smaller in a radial direction than a ring slit located at an outer side. Compared with the prior art, the present application can improve the combustion efficiency.

Description

Technical Field

[0001] This invention belongs to the field of household stove technology, specifically relating to an outer ring burner cap and a burner. Background Technology

[0002] To avoid nozzle clogging caused by overflow, the top-inlet burner adopts a nozzle-top design. The ejector tube is placed horizontally at the bottom of the burner, and its length is limited by the outer diameter of the burner, making it shorter than the length of a conventional ejector tube. Therefore, the ejector performance of the ejector structure is weaker than that of a conventional bottom-inlet structure.

[0003] To compensate for the insufficient primary air in the top-intake burner, the applicant adopted a thin-walled porous form on the top wall of the outer ring burner cap, as shown in the utility model patent application number 202121878439.6, "A burner cap for a gas stove and a burner with the same cap" (authorization announcement number CN215863399U). The burner cap body includes an annular top wall. The annular top wall, together with the inner and outer ring walls extending vertically or obliquely downward from the inner and outer edges of the annular top wall, together form a mixing chamber. The annular top wall is provided with at least two annular slits at intervals along the radial direction, connecting the mixing chamber. At least two partitions are provided at intervals along the circumferential direction on the lower surface of the annular top wall. Adjacent partitions divide each annular slit into their respective corresponding flame outlet areas.

[0004] However, in actual use, the secondary air inside the outer ring burner cap and outside the inner ring burner cap needs to be supplied to both the inner and outer ring burner caps simultaneously. This results in insufficient secondary air supply at the burner holes on the inner ring of the outer ring burner cap (i.e., the burner holes relatively close to the inner ring burner cap), which affects the combustion efficiency. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide an outer ring flame cap that can improve combustion efficiency, in light of the current state of the prior art.

[0006] The second technical problem to be solved by the present invention is to provide a burner having the above-mentioned outer ring flame cap.

[0007] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: an outer ring flame cap, comprising:

[0008] The flame cap body has an annular top wall, an inner annular wall extending downward from the inner edge of the annular top wall, and an outer annular wall extending downward from the outer edge of the annular top wall. The annular top wall, the inner annular wall, and the outer annular wall together form an annular mixing chamber. The annular top wall has annular slits extending circumferentially and communicating with the annular mixing chamber. There are at least two annular slits that are distributed radially at intervals. The upper surface and / or lower surface of the annular top wall has radial ribs extending inward and outward. There are at least two radial ribs that are distributed circumferentially at intervals. Adjacent radial ribs divide each annular slit into its corresponding flame outlet.

[0009] Its features are:

[0010] For two radially adjacent annular seams, the radial dimension of the inner annular seam is less than or equal to the radial dimension of the outer annular seam.

[0011] In this way, the outer secondary air is sufficient, and the corresponding annular gap has a larger radial dimension. The external secondary air is sufficient to fill the annular gap located on the outer side, thereby reducing the flue gas generated during combustion and improving combustion efficiency. The radial dimension of the inner annular gap is no greater than that of the outer annular gap, and there are no flame holes at the radial ribs. The upper surface of the radial ribs forms an inner and outer extending secondary air replenishment channel. Some of the secondary air on the outer side can flow along the upper surface of the radial ribs to the inner side, which can also ensure the replenishment of secondary air in the inner annular gap, thereby improving the overall combustion efficiency of the burner.

[0012] Preferably, the portion of the annular top wall located between two adjacent annular seams is an annular rib;

[0013] The ratio of the radial dimension of a single circumferential seam to the radial width of the corresponding single circumferential rib is 1.5 to 2. This achieves the following technical effects: First, it facilitates secondary air replenishment, and this ratio meets the secondary air requirements of the flame area; second, while the width of the circumferential rib affects both flame propagation and flame cap strength, the aforementioned ratio ensures flame cap strength while also facilitating radial flame propagation.

[0014] When the ratio of the radial dimension of a single circumferential seam to the radial width of the corresponding single circumferential rib is less than 1.5, the area of ​​the burner cap of a household gas stove is limited, resulting in an excessively small area of ​​flame outlets that cannot be properly arranged and cannot meet the design requirements for high loads. When the ratio of the radial dimension of a single circumferential seam to the radial width of the corresponding single circumferential rib is greater than 2, the channel for secondary air circulation between the seams is too small, failing to meet the secondary air requirements of the internal flame outlets and affecting combustion efficiency.

[0015] Preferably, the radial dimension of a single circumferential slit is 1.5–3 mm. If the radial dimension of a single circumferential slit is less than 1.5 mm, the flame area is too small to meet the requirements of high loads; if the radial dimension of a single circumferential slit is greater than 3 mm, with a fixed flame cap area, the channel for secondary air circulation between the circumferential slits is too small to meet the secondary air requirements of the flame holes, thus affecting combustion efficiency.

[0016] Preferably, the radial dimension of the annular slit remains constant or increases from bottom to top. That is, the radial dimension of the annular slit does not decrease from bottom to top, thereby reducing the exhaust resistance; and because the upper end of the annular slit is larger, the upper ends of adjacent annular slits in the radial direction are relatively close, which is beneficial for radial flame propagation; and the larger upper end of the annular slit increases the contact area with secondary air. The "from bottom to top" mentioned above refers to the direction of gas flow.

[0017] In the above scheme, to further promote the replenishment of secondary air, preferably, the annular top wall is inclined downwards from the inside to the outside. The inclined annular top wall has the following technical effects: First, after the air is heated, it flows upwards. The inclined annular top wall facilitates the flow of secondary air from the outside to the inside, making the replenishment of secondary air at the flame outlet holes on the inner ring of the outer ring burner cap and the flame outlet holes on the inner ring burner cap smoother and the combustion efficiency higher; Second, combined with the radial ribs, it is beneficial to guide the overflow, allowing the overflow to flow down along the radial ribs; Third, with a fixed burner cap diameter, the inclined annular top wall can provide more flame outlet holes compared to a planar annular top wall, ensuring a sufficiently large flame outlet area; Fourth, the outer edge of the annular top wall is at a lower height, reducing the overall height of the burner.

[0018] Radial ribs may protrude from the upper surface and / or the upper surface of the annular top wall, preferably from the lower surface of the annular top wall. The radial ribs on the lower surface of the annular top wall ensure that the root of the flame outlet is located within the groove formed by adjacent radial ribs, facilitating circumferential flame transmission and allowing the flame to spread outwards after exiting the annular seam. Simultaneously, they separate adjacent flame outlets, preventing blockage and allowing overflow to flow down along the radial ribs, thus preventing overflow from flowing circumferentially along the lower surface of the annular top wall and spreading to other surrounding flame outlets, thereby preventing blockage of the surrounding flame outlets.

[0019] Preferably, the radial ribs have a thickness of 1.5–7 mm in the vertical direction. Radial ribs within this thickness range provide good anti-blocking and flow guidance. When the gas flows upwards and through adjacent radial ribs, the ribs preheat the gas; conversely, the gas absorbs heat from the ribs, which helps dissipate heat from the burner cap. If the thickness of the radial ribs in the vertical direction is greater than 7 mm, it will result in insufficient space in the mixing chamber below the burner cap, affecting the mixing effect. Furthermore, it will prevent overflow from flowing down the radial ribs, leaving residue on them and thus blocking the flame outlets. If the thickness of the radial ribs in the vertical direction is less than 1.5 mm, it will not effectively separate adjacent circumferential flame outlets, and overflow will not flow completely down the radial ribs.

[0020] Preferably, the ratio of the circumferential length of a single flame outlet to the circumferential width of the corresponding single radial rib is 0.8 to 2. This ensures both effective flame transmission and sufficient flame outlet strength and area. If the width ratio is less than 0.8, the flame transmission effect will be poor. The upper surface of the radial rib forms an inwardly extending secondary air supply channel, allowing some secondary air on the outer side to flow to the inner side along the upper surface of the radial rib. If the width ratio is greater than 2, the secondary air supply channel will be too small, affecting the intake of secondary air and thus impacting combustion efficiency.

[0021] Preferably, the width of a single radial rib in the circumferential direction is 1.5 to 4 mm.

[0022] Furthermore, the spacing between two adjacent radial ribs gradually decreases from bottom to top. This allows the gas to be accelerated as it flows upwards and passes between adjacent radial ribs. The "bottom to top" mentioned above refers to the direction of gas flow.

[0023] Furthermore, the spacing between two adjacent radial ribs gradually decreases from the outside to the inside. This achieves the following technical effects: First, the combustion gas under the burner is accelerated as it flows from the outside to the inside between two adjacent radial ribs; second, the flame area of ​​each flame outlet decreases from the outside to the inside, meaning that the secondary air required for the inner flame outlet is less than that required for the outer flame outlet, while the outer flame outlet has sufficient secondary air, resulting in a larger flame area and higher combustion efficiency; some of the secondary air on the outside can flow along the radial ribs to the inside, ensuring the replenishment of secondary air for the inner flame outlet, thus effectively improving the overall combustion efficiency of the burner.

[0024] Preferably, the radial ribs extend through the center of the corresponding circle of the annular top wall. This facilitates the output of the gas.

[0025] In the above-mentioned schemes, preferably, the flame outlet is quadrilateral.

[0026] The technical solution adopted by the present invention to solve the second technical problem mentioned above is: a burner, characterized by having an outer ring flame cap as described above.

[0027] Preferably, the burner is used in a stove.

[0028] The burner is preferably an upper air intake burner. Of course, the burner can also be a lower air intake burner.

[0029] Compared with the prior art, the advantages of the present invention are as follows: by designing the radial dimension of the inner annular seam to be smaller than or equal to the radial dimension of the outer annular seam, the outer secondary air is sufficient, and the corresponding radial dimension of the annular seam is larger, so that the external secondary air is sufficient to replenish the outer annular seam, thereby reducing the flue gas generated during combustion and improving combustion efficiency; the radial dimension of the inner annular seam is not greater than that of the outer annular seam, and there are no flame holes at the radial ribs. The upper surface of the radial ribs forms an inner and outer extending secondary air replenishment channel, and part of the secondary air on the outside can flow along the upper surface of the radial ribs to the inside, which can also ensure the replenishment of secondary air in the inner annular seam, thereby improving the overall combustion efficiency of the burner. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the outer ring flame cap in an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the outer ring fire cap from another perspective in an embodiment of the present invention.

[0032] Figure 3 This is a cross-sectional view of the outer ring fire cover in an embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the burner structure in an embodiment of the present invention;

[0034] Figure 5 This is a cross-sectional view of the burner in an embodiment of the present invention. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0036] like Figures 1-5 As shown, this is a preferred embodiment of the outer ring burner and burner of the present invention. The burner is for top-intake combustion in a stove and includes a base 3, an outer ring burner and an inner ring burner 2.

[0037] The base 3 is a prior art technology, having an inner ring mixing chamber 31 with its opening facing upwards and an outer ring mixing chamber 32 located circumferentially around the inner ring mixing chamber 31.

[0038] The inner ring burner cap 2 is installed on the inner ring mixing chamber 31 and has a vertically extending peripheral wall 21. The peripheral wall 21 is provided with inner ring burner holes 210 at intervals along the circumference. The diameter of a single inner ring burner hole 210 is 1.8 to 3 mm (the diameter of a single inner ring main burner hole 210 can be any value from 1.8 to 3, such as 1.8, 2 or 3).

[0039] An outer ring flame cap is mounted on an outer ring mixing chamber 32 and includes a flame cap body 1. The flame cap body 1 has an annular top wall 11, an inner ring wall 12 extending downward from the inner edge of the annular top wall 11, and an outer ring wall 13 extending downward from the outer edge of the annular top wall 11. An annular mixing chamber 10 with a downward opening is formed between the annular top wall 11, the inner ring wall 12, and the outer ring wall 13. In this embodiment, the annular top wall 11 of the outer ring flame cap slopes downward from the inside to the outside, and the angle between the annular top wall 11 and the horizontal plane is 20° to 45° (this angle can be any value between 20° and 45°, such as 20°, 30°, or 45°). The inner ring wall 12 of the outer ring flame cap is located outside the peripheral wall 21 of the inner ring flame cap 2 and is spaced apart from the peripheral wall 21. Furthermore, the upper part of the inner ring wall 12 of the outer ring flame cap slopes inward from top to bottom to form a guide wall 121. The angle between the guide wall 121 and the horizontal plane is smaller than the angle between the axis of the inner ring flame hole 210 and the horizontal plane. Simultaneously, the upper edge of the guide wall 121 engages with the inner edge of the annular top wall 11. The lower edge of the guide wall 121 is at a lower height than the lower edge of the inner ring flame hole 210. This prevents the flame at the inner ring main flame hole 210 from burning the guide wall 121.

[0040] The annular top wall 11 is provided with circumferentially extending annular slits 110 that connect to the annular mixing chamber 10. Multiple annular slits 110 are distributed radially at intervals. The radial dimension d of a single annular slit 110 is 1.5–3 mm (the dimension d can be any value from 1.5 to 3 mm, such as 1.5 mm, 2 mm, or 3 mm, etc.). The radial dimension of the inner annular slit 110 is less than or equal to the radial dimension of the outer annular slit 110. The radial dimension of the annular slits 110 remains constant or increases from bottom to top. The annular top wall 11 is located between two adjacent annular slits. The portion between 110 is an annular rib 112. The ratio of the radial dimension d of a single annular seam 110 to the radial width d1 of the corresponding single annular rib 112 is 1.5 to 2 (the ratio can be any value between 1.5 and 2, such as 1.5, 2, or 1.8). Thus, the annular rib 112 with a ratio of 1.5 to 2 can ensure the strength of the flame cap while also facilitating radial flame transmission. Furthermore, secondary air can flow and be replenished along the annular rib. The annular seam and annular rib with a ratio of 1.5 to 2 can meet the secondary air requirements of the flame area.

[0041] The lower surface of the annular top wall 11 is provided with radial ribs 111 extending inward and outward. The radial ribs 111 extend through the corresponding center of the annular top wall 11. The thickness D1 of the radial ribs 111 in the vertical direction is 1.5 to 7 mm, and the width D2 in the circumferential direction of the flame cap is 1.5 to 4 mm (the thickness D1 can be any value from 1.5 to 7 mm, such as 1.5 mm, 2 mm, 5 mm, or 7 mm. The width D2 can be any value from 1.5 to 4 mm, such as 1.5 mm, 2 mm, 3 mm, or 4 mm). At the same time, there are multiple radial ribs 111 distributed at intervals along the circumference. Two adjacent radial ribs 111 divide each annular slit 110 into their respective corresponding flame outlet holes. Each flame outlet is quadrilateral, and the ratio of its circumferential length D3 to the circumferential width D2 of the corresponding radial rib 111 is 0.8 to 2 (the ratio can be any value between 0.8 and 2, such as 0.8, 1, or 2). This ensures both effective flame transmission and flame outlet strength and area. Furthermore, the spacing between adjacent radial ribs 111 gradually decreases from bottom to top and from outside to inside.

[0042] In this embodiment, multiple flame outlets arranged at intervals form flame zones 11a. There are four flame zones 11a, distributed circumferentially. A portion of the annular top wall 11 located between two adjacent flame zones 11a is a first flame-outlet zone 11b without flame outlets. A portion of the annular top wall 11 corresponding to each flame zone 11a is a second flame-outlet zone 11c without flame outlets. The circumferential width of a single second flame-outlet zone 11c is smaller than the circumferential width of a single first flame-outlet zone 11b, but larger than the circumferential width of a single flame outlet in the corresponding flame zone 11a. Thus, the wider second flame-outlet zone 11c can guide secondary air, allowing it to enter along the second flame-outlet zone and replenish each flame outlet, solving the problem of insufficient secondary air replenishment. Furthermore, since the second flame-outlet zones 11c are positioned corresponding to flame zones 11a, they can separate the flames in flame zones 11a, forming smaller flame outlet areas, reducing flame height, and improving thermal efficiency.

[0043] In this embodiment, the flame zone 11a has an inner portion relatively close to the inner edge of the annular top wall 11 and an outer portion relatively far from the inner edge of the annular top wall 11. A first flame-outlet zone 11b extends radially and is located on the outer portion of the flame zone 11a, and a second flame-outlet zone 11c extends radially and is located on the outer portion of the flame zone 11a. The first flame-outlet zone 11b and the second flame-outlet zone 11c are arranged alternately in the circumferential direction. This allows the flame-outlet zones to guide the secondary air outside the flame cap to flow inward, thus replenishing the secondary air.

[0044] Meanwhile, the radial extension length of the first non-flame-escape zone 11b is at least half the radial dimension of the flame zone 11a, and the inner side of the flame zone 11a has flame-escape holes distributed circumferentially corresponding to the position of the first non-flame-escape zone 11b; the radial extension length of the second non-flame-escape zone 11c is at least half the radial dimension of the flame zone 11a, and the inner side of the flame zone 11a has flame-escape holes distributed circumferentially corresponding to the position of the second non-flame-escape zone 11c, thereby avoiding the non-flame-escape zone setting from affecting the circumferential flame transmission, while ensuring the radial replenishment of secondary air. Furthermore, from the outside to the inside, the circumferential width of the first non-flame-escape zone 11b gradually decreases, and the circumferential width of the second non-flame-escape zone 11c gradually decreases, thus effectively guiding the secondary air while increasing the number of flame-escape holes and the flame-escape area in contact with the secondary air. Furthermore, the sum of the upper surface areas of the first no-flame zone 11b and the second no-flame zone 11c accounts for at least 1 / 10 of the upper surface area of ​​the entire annular top wall 11. This ensures optimal secondary air replenishment and the best combustion efficiency, with the replenished secondary air being sufficient or even just enough to meet the combustion requirements.

[0045] Meanwhile, in this embodiment, the lower surface of the annular top wall 11 is provided with a first protrusion 113 corresponding to the position of each first non-flame zone 11b; and the lower surface of the annular top wall 11 is provided with a second protrusion 114 corresponding to the position of each second non-flame zone 11c. The provision of the first and second protrusions can prevent the overflow liquid from flowing circumferentially and blocking other surrounding flame outlets.

[0046] The specification and claims of this invention use terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," to describe various exemplary structural parts and elements of the invention. However, these terms are used herein merely for ease of explanation and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this invention can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0047] The term "vertical" is also used in the specification and claims of this invention, meaning basically along the up and down direction, and is not limited to just the vertical direction, but can also be slightly deviated from the vertical direction.

[0048] The term "radial" is also used in the specification and claims of this invention, meaning essentially along the inside-out direction, and is not limited to the radial direction that passes through the center of the circle, but can also be slightly deviated from the radial direction.

Claims

1. An outer ring flame cap, comprising: The flame cap body (1) has an annular top wall (11), an inner annular wall (12), and an outer annular wall (13). The annular top wall (11), the inner annular wall (12), and the outer annular wall (13) together form an annular mixing chamber (10). The annular top wall (11) is provided with annular slits (110) that extend circumferentially and connect to the annular mixing chamber (10). There are at least two annular slits (110) that are distributed radially at intervals. The upper surface and / or lower surface of the annular top wall (11) are provided with radial ribs (111) that extend inward and outward. There are at least two radial ribs (111) that are distributed circumferentially at intervals. Two adjacent radial ribs (111) divide each annular slit (110) into their respective corresponding flame outlets. Its features are: For two radially adjacent annular seams (110), the radial dimension of the inner annular seam (110) is less than or equal to the radial dimension of the outer annular seam (110); Multiple flame holes arranged at intervals form flame zones (11a), each flame zone (11a) is distributed circumferentially, and the part of the annular top wall (11) located between two adjacent flame zones (11a) is the first flameless zone (11b) without flame holes.

2. The outer ring flame cap according to claim 1, characterized in that: The portion of the annular top wall (11) located between two adjacent annular seams (110) is an annular rib (112); The ratio of the radial dimension of a single annular seam (110) to the radial width of the corresponding single annular rib (112) is 1.5 to 2.

3. The outer ring flame cap according to claim 1, characterized in that: The radial dimension of a single circumferential slit (110) is 1.5~3mm.

4. The outer ring flame cap according to claim 1, characterized in that: The radial dimension of the circumferential seam (110) remains constant or increases from bottom to top.

5. The outer ring flame cap according to any one of claims 1 to 4, characterized in that: The annular top wall (11) slopes downward from the inside to the outside; The radial ribs (111) protrude from the lower surface of the annular top wall (11).

6. The outer ring flame cap according to claim 5, characterized in that: The radial rib (111) has a thickness of 1.5~7mm in the vertical direction.

7. The outer ring flame cap according to claim 5, characterized in that: The ratio of the length of a single fire hole in the circumferential direction to the width of the corresponding single radial rib (111) in the circumferential direction is 0.8~2.

8. The outer ring flame cap according to claim 5, characterized in that: The width of a single radial rib (111) in the circumferential direction is 1.5~4mm.

9. The outer ring flame cap according to claim 5, characterized in that: The spacing between two adjacent radial stiffeners (111) gradually decreases from bottom to top.

10. The outer ring flame cap according to claim 5, characterized in that: The spacing between two adjacent radial stiffeners (111) gradually decreases from the outside to the inside.

11. The outer ring flame cap according to claim 5, characterized in that: The radial ribs (111) extend through the center of the annular top wall (11).

12. A burner, characterized in that... It has an outer ring fire cap as described in any one of claims 1 to 11.

13. The burner according to claim 12, characterized in that: The burner is an upward-intake burner and is used in stoves.

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