Inner ring fire cover, combustor comprising inner ring fire cover and stove

Abstract

The invention discloses an inner ring fire cover, a combustor comprising the inner ring fire cover and a kitchen range, the inner ring fire cover comprises a plurality of fire holes arranged around the axis of the inner ring fire cover, and the inner ring fire cover comprises a lower cover body and an upper cover body which are detachably spliced with each other in the height direction; an open slotted hole is formed in the surface of the upper cover body or the surface of the lower cover body, and the slotted hole is closed by the opposite splicing surface of the lower cover body or the opposite splicing surface of the upper cover body so that the fire hole can be formed. The extending direction of the groove holes from the inner side inlets to the outer side outlets of the groove holes deviates relative to the radial direction of the inner ring fire cover so as to form opposite outward rotation extension. On one hand, the slotted holes can be cleaned conveniently, attachment of water drops is reduced, on the other hand, the extending distance of the fire holes is increased, and therefore the flame stabilizing performance is still improved under the condition that the size is limited. When energy efficiency conversion is carried out, heat loss from inside to outside in unit time is less.

Description

Technical Field

[0001] The invention relates to an inner ring fire cover, a burner comprising the same and a stove. Background Art

[0002] In existing gas stoves, the fire holes of the inner ring fire cover are easily clogged by oil, overflow, etc., which is not convenient to clean. After cleaning, the fire cannot be ignited due to water in the hole (water is easily attached to the closed hole). In addition, in actual product design, due to the limited overall size of the burner head, the size of the secondary air cavity between the inner ring fire cover and the outer ring fire cover is limited. Therefore, the extension distance of the fire hole of the existing inner ring fire cover is limited and cannot be too long, which leads to excessive gas flow rate, poor flame stability under cold and high pressure conditions, and is prone to flame separation, low efficiency, excessive smoke and other problems.

[0003] Among the existing methods of increasing fire holes, the first is to increase the outer diameter of the inner ring fire cover, but in this way the secondary air cavity between the inner ring fire cover and the outer ring fire cover will become smaller, which will cause the smoke to exceed the standard (incomplete combustion due to insufficient secondary air), so it can only be increased to a limited size; the second is to reduce the inner diameter of the inner ring fire cover. This solution to deepen the extension distance of the fire hole will result in thin walls, insufficient strength and the inability to be processed by the mold, so it can only be reduced to a limited size. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defects in the prior art that the inner ring fire cover is not easy to clean and has poor flame stability.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] An inner ring fire cover comprises a plurality of fire holes arranged around the axis of the inner ring fire cover, the inner ring fire cover comprises a lower cover body and an upper cover body which are separably connected to each other along the height direction, an open slot is formed on the surface of the upper cover body or the lower cover body, the slot is closed by the splicing surface of the relative lower cover body or the upper cover body to form the fire hole, wherein the extension direction of the slot from its inner inlet to the outer outlet is offset relative to the radial direction of the inner ring fire cover to form a relative outward rotation extension.

[0007] In this solution, on the one hand, the split upper cover and lower cover can facilitate the cleaning of the open slots, and the cleaning time will be greatly reduced. After the open slots are cleaned in water, the adhesion of water droplets will be smaller, so it is not easy for water droplets to adhere to the inside of the fire hole after cleaning, causing the fire to fail to ignite. The form of one side of the slots and one side of the splicing surface avoids the problem of alignment of the slots on both sides, and the problems caused by excessive smoke, backfire and explosion.

[0008] On the other hand, by changing the slot, the relative position of the fire hole and the axis of the inner ring fire cover is changed, so that it deviates from the axis, thereby increasing the extension distance of the fire hole, that is, the depth, thereby achieving the improvement of flame stabilization performance under the condition of limited size. The cost of the inner ring fire cover is basically the same as the original one (the material consumption does not increase). When performing energy efficiency conversion, the energy lost to the outside per unit time is less. The open slot also facilitates the processing of the relatively outward rotating slot and the subsequent cleaning.

[0009] Preferably, the cross-sectional shape of the outer outlet presents different extension heights in the direction around the axis, and the cross-sectional shape of each outer outlet has a longer extension height on one side in the direction of the outward rotation extension, and a shorter extension height on the opposite side, wherein the side with the longer extension height of each outer outlet exceeds the side with the shorter extension height of the adjacent outer outlet in the direction of the axis. Due to the relative outward rotation setting, the flame of the fire hole will spray toward the adjacent fire hole on the side of the outward rotation extension, and thus by setting different extension heights, the flame of the fire hole can cover the root of the flame of the adjacent fire hole on the side of the outward rotation extension in the height direction, thereby achieving a flame stabilizing effect on the fire hole.

[0010] Preferably, the cross-sectional shape of the outer outlet is a quadrilateral shape with the upper edge or the lower edge inclined in the direction of the axis. The quadrilateral shape can provide greater resistance under the same cross-sectional area, help reduce the gas velocity, and help stabilize the flame.

[0011] Preferably, the cross-sectional shape of each part inside the slot is a rectangular shape. The rectangular shape can provide greater resistance than a circular shape under the condition of the same cross-sectional area, which helps to reduce the gas velocity and help stabilize the flame.

[0012] Preferably, the cross-sectional shape of the outer outlet is a right-angled trapezoidal shape. The right-angled trapezoidal shape is easier to process and can ensure more resistance to reduce the gas velocity and help stabilize the flame.

[0013] Preferably, adjacent slots partially overlap and communicate with each other on the side close to the inner inlet, thereby increasing the outward rotation angle of the slots while keeping the number of the slots unchanged, thereby further extending the extension distance of the fire hole.

[0014] Preferably, the cross-sectional shape of the inner inlet presents a form of different extension heights in the direction around the axis, the cross-sectional shape of each inner inlet is located at a lower side in the direction of the outward rotation extension, and the cross-sectional shape of each inner inlet is located at a higher side in the opposite direction of the outward rotation extension, and the connection between adjacent slots is formed between the splicing surface and the higher part of the slot. Thus, the height difference causes the connection between adjacent slots to be narrowed by the higher part, so that part of the gas of adjacent slots is blocked by the higher part in the overlapping area, and only part of it will flow into the adjacent slot. Thus, when the extension distance of the fire hole is increased by overlapping, it is possible to avoid affecting the stability of the gas of each fire hole and reduce mutual interference.

[0015] Preferably, the slotted hole gradually extends upwards in the process of extending from the inner inlet to the outer outlet, the joint surface is in a conical shape as a whole, the slot end surface formed by the side wall of the slotted hole is in a corresponding conical shape, and the fire hole formed by the jointing of the jointed surface and the slotted hole extends upwards from the inside to the outside. In this way, the extension distance of the slotted hole and the fire hole can be further increased, and the flame stabilization capability can be improved. However, the upward extension will shorten the distance between the inner ring fire and the pot, thereby causing the smoke to exceed the standard. Without lifting the pot support, the upward extension distance is limited.

[0016] Preferably, an annular first limiting annular surface is formed on the splicing surface, and an annular second limiting annular surface is formed at a corresponding position of the groove end surface, and the slopes of the first limiting annular surface and the second limiting annular surface are different from the overall slope of the splicing surface or the groove end surface. The first limiting annular surface and the second limiting annular surface can play a limiting role in the radial direction of the inner ring fire cover to ensure that the upper cover body and the lower cover body are spliced ​​in the correct position.

[0017] Preferably, the upper cover or the lower cover is provided with a positioning member protruding along the axis direction, and the corresponding position of the lower cover or the upper cover is provided with a receiving portion recessed along the axis direction, the positioning member and the receiving portion are mutually limited in a plane perpendicular to the axis direction, and the positioning member and the receiving portion are detachably provided along the axis direction. The positioning member and the receiving portion play the role of guiding the splicing and limiting the relative rotation.

[0018] Preferably, the inner side of the upper cover body has a protruding bump portion, and the positioning piece is connected to the bump portion, wherein the ignition hole of the inner ring fire cover extends and passes through the bump portion. On the one hand, the bump portion has more material to increase the connection strength of the positioning piece, and on the other hand, the bump portion also increases the extension distance of the ignition hole, thereby improving the ignition stability.

[0019] Preferably, the slot is provided on the upper cover, and the joint surface is provided on the lower cover, so that the slot can be more conveniently removed along with the upper cover for cleaning.

[0020] A burner comprises a base, an outer ring fire cover and an inner ring fire cover, wherein the lower cover body is connected to the base.

[0021] A stove comprises the inner ring fire cover.

[0022] The positive effect of the present invention is that: on the one hand, the present invention facilitates the cleaning of the slot holes and reduces the adhesion of water droplets, and on the other hand, increases the extension distance of the fire hole, thereby achieving the improvement of flame stabilization performance under the condition of limited size. When performing energy efficiency conversion, the energy lost to the outside in unit time is less. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the inner ring fire cover according to a preferred embodiment of the present invention.

[0024] Figure 2 Schematic diagram of the explosion structure of the inner ring fire cover according to a preferred embodiment of the present invention.

[0025] Figure 3 It is a schematic diagram of the side structure of the inner ring fire cover of a preferred embodiment of the present invention.

[0026] Figure 4 It is a schematic cross-sectional structure diagram of the inner ring fire cover of a preferred embodiment of the present invention.

[0027] Figure 5 It is a schematic diagram of the three-dimensional structure of the lower cover body of a preferred embodiment of the present invention.

[0028] Figure 6 It is a schematic diagram of the three-dimensional structure of the upper cover body of a preferred embodiment of the present invention.

[0029] Figure 7 It is a bottom view structural schematic diagram of the upper cover body of a preferred embodiment of the present invention.

[0030] Figure 8 Schematic diagram of the outward rotation of the slot hole in a preferred embodiment of the present invention.

[0031] Fig. 9 It is a schematic structural diagram of the outer outlet of a preferred embodiment of the present invention.

[0032] Fig.10 Schematic diagram of the overlap of the inner inlet of a preferred embodiment of the present invention.

[0033] Fig.11 Schematic diagram of the structure of the inner inlet of a preferred embodiment of the present invention.

[0034] Fig.12 Schematic diagram of the structure of a burner according to a preferred embodiment of the present invention.

[0035] Description of Reference Numerals

[0036] Upper cover 100

[0037] Fire Hole 101

[0038] Groove end face 102

[0039] Slot 110

[0040] Inside inlet 111

[0041] External exit 112

[0042] External rotation extends to one side 113

[0043] The opposite side 114

[0044] Higher point 115

[0045] Lower 116

[0046] Bump 120

[0047] Ignition hole 130

[0048] Flame stabilizing hole 140

[0049] Positioning piece 150

[0050] The second limiting annular surface 160

[0051] Lower cover 200

[0052] Splicing surface 210

[0053] The first limiting annular surface 220

[0054] Accommodation portion 230

[0055] Outer ring fire cover 300

[0056] Base 400

[0057] Axis O

[0058] External rotation direction X

[0059] Extension direction A

[0060] Radial B

[0061] Extended height c

[0062] Extended height d

[0063] Overlapping area E

[0064] Connection F DETAILED DESCRIPTION

[0065] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0066] like Figure 1-Figure 11 As shown, the preferred embodiment of the present invention discloses an inner ring fire cover. Figure 1-Figure 4 As shown, the inner ring fire cover of this embodiment includes a lower cover body 200 and an upper cover body 100 which are separably spliced ​​to each other along the height direction. The upper cover body 100 and the lower cover body 200 constitute the inner ring fire cover as a whole. Among them, the upper cover body 100 and the lower cover body 200 are spliced ​​by stacking up and down, and the upper cover body 100 can be lifted to complete the separation during disassembly. In other embodiments, the upper cover body 100 and the lower cover body 200 can also be spliced ​​by a known splicing method. The split upper cover body 100 and the lower cover body 200 can facilitate the cleaning of the open slot hole 110, and the cleaning time will be greatly reduced. After the open slot hole 110 is cleaned in water, the adhesion of water droplets will be smaller, so it is not easy for water droplets to adhere to the inside of the fire hole 101 after cleaning, resulting in a failure to ignite.

[0067] like Figure 2 , Figure 5 and Figure 6 As shown, the inner ring fire cover of the present embodiment includes a plurality of fire holes 101 arranged around the axis O of the inner ring fire cover, a splicing surface 210 is formed on the side of the lower cover body 200 facing the upper cover body 100, an open slot 110 is formed on the surface of the upper cover body 100, and the slot 110 is closed by the splicing surface 210 of the lower cover body 200 relative to form the fire hole 101. Among them, the fire hole 101 in the present embodiment refers to a closed channel with open ends formed by the splicing surface 210 and the slot 110, and the slot 110 refers to a semi-closed channel without being blocked by the splicing surface 210. Therefore, the two are in an inclusive relationship, and some parts indicated by guide lines in the figure refer to both the slot 110 and the fire hole 101 to which it belongs. In addition, as Figure 6 As shown, the open slot 110 also facilitates the processing and subsequent cleaning of the relatively outwardly rotating slot 110. In this embodiment, the slot 110 is only on the upper cover 100, which avoids the alignment problem and the problems of excessive smoke, flashback and explosion caused by it, compared with directly dividing the fire hole 101 in half.

[0068] like Figure 7 and Figure 8As shown in FIG. 1 , in this embodiment, the extending direction A of the slot hole 110 from its inner inlet 111 to the outer outlet 112 is offset relative to the radial direction B to form a relative outward extension. The distance that the existing inner inlet 111 extends along the radial direction B is the extension distance of the existing slot hole. In this embodiment, due to the inclined setting of the extending direction A, Figure 8 The extension distance or depth of the slot 110 in the inner ring fire cover increases. The greater the angle of inclination relative to the radial direction B, the greater the extension distance or depth of the slot 110 increases. Therefore, by changing the extension direction A of the slot 110, the relative position of the fire hole 101 in the radial direction B with respect to the axis O of the inner ring fire cover is changed, so that it deviates from the axis O, thereby increasing the extension distance, i.e., the depth, of the fire hole 101, thereby still achieving an improvement in the flame stabilization performance under the condition of limited size. The cost of the inner ring fire cover is also basically the same as the original one (the material consumption does not increase).

[0069] At the same time, along the gas outlet direction of the fire hole 101, the circle formed by the distance point extending outward from the root of the fire hole 101 relative to the axis X is the effective circle of the inner ring fire cover (energy efficiency effect). Due to the inclined setting of the slot 110 and the fire hole 101, the distance range extending outward from the fire hole 101 in this embodiment is angled relative to the radial direction B. Therefore, at the same extended distance, the distance point extending outward in this embodiment is closer to the axis X (due to the inclination, the distance component along the radial direction B is less than the distance extending outward), and the energy efficiency circle formed thereby has a smaller diameter, that is, the energy efficiency circle is closer to the inside of the burner. When performing energy efficiency conversion, the energy lost to the outside in unit time is less. From the law of conservation of energy, it can be seen that Qtotal = Qeffective + Qloss, the total energy Qtotal remains unchanged, and Qloss is reduced, thereby improving Qeffective and improving energy efficiency. At the same time, since the energy efficiency circle is smaller, the flame acts on the energy-efficient cookware for a longer time, which is also beneficial to improving energy efficiency.

[0070] like Fig. 9 As shown, in a preferred embodiment, the cross-sectional shape of the outer outlet 112 presents different extension heights in the direction around the axis O, and the side 113 of the cross-sectional shape of each outer outlet 112 located in the direction of outward rotation extension (outward rotation direction X) has a longer extension height d, and the side 114 in the opposite direction has a shorter extension height c, wherein the side 114 of each outer outlet 112 with a longer extension height exceeds the side 113 of the adjacent outer outlet 112 with a shorter extension height in the direction of the axis O, that is, the extension height d exceeds the extension height c in the direction of the axis O. Due to the relative outward rotation setting, the flame of the fire hole 101 will spray toward the adjacent fire hole 101 on the side of the outward rotation extension direction (outward rotation direction X), that is, Fig. 9By setting different extension heights, the flame of the fire hole 101 can cover the root of the flame of the adjacent fire hole 101 on the left side along the outward extension direction, thereby achieving the flame stabilization effect on the fire hole 101. Fig. 9 The fire holes 101 or slots 110 shown in the figure have the same shape, so the relative size relationship can be ensured as long as one side 113 of each slot 110 is larger than the other side 114. Of course, in other embodiments, the fire holes 101 or slots 110 have different shapes.

[0071] like Fig. 9 As shown, in a preferred embodiment, the cross-sectional shape of the outer outlet 112 is that the upper edge is in the direction of the axis O (ie Fig. 9 The fire hole 101 of the present embodiment and the existing circular fire hole can be of equal area, that is, the fire hole strength is the same. However, when the cross-sectional shape is different, the resistance coefficient is different; the rectangular hole or quadrilateral hole of equal area has a longer perimeter corresponding to the same area, and its resistance coefficient is greater, which is more conducive to flame stabilization from the perspective of flame stabilization, and the larger the perimeter, the less likely it is to flash back due to the large resistance coefficient, thereby solving the problem of explosion when the fire is turned off.

[0072] For details, please refer to Stoke's law: the viscosity of the fluid will cause resistance between the fluid and the solid side wall when it flows, F = 6πηυR. In the formula, F is the resistance, R is the radius of the sphere, υ is its speed relative to the liquid, and η is the viscosity coefficient of the liquid. This formula is called Stoke's law. The formula F = 6πηυR is converted to F = 3*(2πR)ηυ = 3Cηυ; where 2πR is the circumference of the circle C. When the initial velocity of the fluid is the same as V0, in the cross-sections with equal cross-sections but different shapes, and the flow length is the same as L, the reduction of the outlet flow velocity V1 from V0 is affected by the resistance between the fluid and the side wall of the cross-section. The longer the circumference of the cross-section, the larger the contact area between the process and the channel, the greater the resistance F, and the greater the flow velocity reduction value △V = V0-V1, that is, the more the flow velocity is reduced at the outlet. According to the resistance formula F = 6πηυR of Stoke's law, it can be obtained that the resistance of the quadrilateral fire hole is greater than that of the circular fire hole, which is more conducive to flame stabilization.

[0073] It can be seen that the quadrilateral shape can provide greater resistance under the same cross-sectional area, which helps to reduce the gas velocity and help stabilize the flame. In other embodiments, if the slot 110 is set on the upper cover, the cross-sectional shape of the corresponding outer outlet 112 is a quadrilateral shape with the lower edge inclined in the direction of the axis O.

[0074] In a further preferred embodiment, the cross-sectional shape of each part inside the slot 110 is a rectangular shape. The rectangular shape can provide greater resistance than a circular shape with the same cross-sectional area, which helps to reduce the gas velocity and help stabilize the flame.

[0075] like Fig. 9 As shown, in a further preferred embodiment, the cross-sectional shape of the outer outlet 112 is a right-angled trapezoid. The right-angled trapezoid shape is easier to process and can ensure more resistance to reduce the gas velocity and help stabilize the flame. Of course, in other embodiments, it can also be set to a suitable shape according to actual conditions.

[0076] like Figure 8 , Fig.10 and Fig.11 As shown, in a preferred embodiment, adjacent slots 110 may partially overlap and communicate with each other on the side close to the inner inlet 111. Fig.10 As shown, there is an overlapping area E between the inner inlets 111 of adjacent slots 110. When the number of slots 110 is constant, the inclined slots 110 can increase the extension distance of the slots 110, but at the same time, the extension distance of the inner inlet 111 around the axis O will also be increased. Therefore, by overlapping, the outward rotation angle of the slots 110 can be further increased without reducing the number of slots 110, thereby further extending the extension distance of the fire hole 101. Of course, in other embodiments, the slots 110 may not overlap at all and be isolated from each other.

[0077] like Fig.11 As shown, in a further preferred embodiment, the cross-sectional shape of the inner inlet 111 presents a form with different extension heights in the direction around the axis O, and the side of the cross-sectional shape of each inner inlet 111 located in the direction of the outward rotation extension (outward rotation direction X) is a lower part 116, and the side of the cross-sectional shape of each outer outlet 112 located in the opposite direction of the outward rotation extension is a higher part 115. Fig.11, the left side of the slot hole 110 in the figure (located in the direction of the external rotation extension, i.e., the external rotation direction X) is the lower part 116, and the right side is the higher part 115. The connection point F of the adjacent slot holes 110 is formed between the joint surface 210 and the higher part 115 of the slot hole 110. Therefore, the height difference causes the connection point F of the inner side inlet 111 of the adjacent slot hole 110 to be narrowed by the higher part 115, which is equivalent to the space below the connection point F being blocked by the higher part 115 of the slot hole 110 on the left. Therefore, part of the gas located at the lower part 116 of the inner side inlet 111 of the adjacent right slot hole 110 is blocked by the higher part 115 of the inner side inlet 111 of the slot hole 110 on the left in the overlapping area E, and only part of it will flow into the adjacent slot hole 110. Therefore, when the extension distance of the fire hole 101 is increased by overlapping, it can avoid affecting the stability of the gas of each fire hole 101 and reduce mutual interference.

[0078] In the above preferred embodiment, the inner inlet 111 of each slot 110 is set to be one high and one low, thereby forming a continuous sawtooth shape (such as Figure 6 In other embodiments, the connection point F of the overlapping area E may be narrowed by other structures, for example, by adding a wall structure extending in the overlapping area E to block part of the airflow.

[0079] like Figure 4 , Figure 5 and Figure 6 As shown, in a preferred embodiment, the slot hole 110 gradually extends upward from the inner inlet 111 to the outer outlet 112, the joint surface 210 is in a conical shape as a whole, the slot end surface 102 formed by the side wall of the slot hole 110 is in a corresponding conical shape, and the fire hole 101 formed by the joint surface 210 and the slot hole 110 extends upward from the inside to the outside. In this way, the extension distance of the slot hole 110 and the fire hole 101 can be further increased, and the flame stabilization capability can be improved. However, the upward extension will shorten the distance between the inner ring fire and the pot, thereby causing the smoke to exceed the standard. Without lifting the pot support, the upward extension distance is limited.

[0080] like Figure 5 and Figure 6As shown, in a preferred embodiment, an annular first limiting annular surface 220 is formed on the splicing surface 210, and an annular second limiting annular surface 160 is formed at the corresponding position of the groove end surface 102, and the slopes of the first limiting annular surface 220 and the second limiting annular surface 160 are different from the overall slope of the splicing surface 210 or the groove end surface 102. The first limiting annular surface 220 and the second limiting annular surface 160 can play a limiting role in the radial direction of the inner ring fire cover to ensure that the upper cover body 100 and the lower cover body 200 are spliced ​​in the correct position. In a further preferred embodiment, the first limiting annular surface 220 and the second limiting annular surface 160 are both set to planes with a slope of 0. The overall slope in this preferred embodiment includes the slope of a straight line and the curvature of a curve. That is, the first limiting annular surface 220 and the second limiting annular surface 160 can also be in the form of curved surfaces to produce different overall slopes.

[0081] like Figure 4 , Figure 5 and Figure 6 As shown, in a preferred embodiment, a positioning member 150 protruding along the axis O direction is provided on the upper cover body 100, and a receiving portion 230 recessed along the axis O direction is provided at a corresponding position of the lower cover body 200, and the positioning member 150 and the receiving portion 230 are mutually limited in a plane perpendicular to the axis O direction, and the positioning member 150 and the receiving portion 230 are detachably arranged along the axis O direction. The positioning member 150 and the receiving portion 230 play the role of guiding splicing and limiting relative rotation. In other embodiments, the positions of the positioning member 150 and the receiving portion 230 can also be interchanged as needed. The number of positioning members 150 and the receiving portion 230 is not limited to 1, and the corresponding number and position can also be set according to actual needs. The positioning member 150 can be connected to the upper cover body 100 or the lower cover body 200 in a detachable manner. For example, it can be connected by a threaded manner. A corresponding operating shape can be set on the surface of the positioning member, such as a cross shape for a screwdriver to install and remove.

[0082] like Figure 4 , Figure 5 and Figure 6 As shown, in a further preferred embodiment, the inner side of the upper cover body 100 has a protruding lug portion 120, and the positioning member 150 is connected to the lug portion 120, wherein the ignition hole 130 of the inner ring fire cover extends and passes through the lug portion 120. On the one hand, the lug portion 120 has more material to increase the connection strength of the positioning member 150, and on the other hand, the lug portion 120 also increases the extension distance of the ignition hole 130, thereby improving the ignition stability. Of course, in other embodiments, multiple lug portions 120 may also be provided for the setting of the ignition hole 130 and the installation of the positioning member 150, respectively.

[0083] This embodiment of Figure 1-Figure 11The embodiment shown is that the slot 110 is provided on the upper cover 100, and the splicing surface 210 is provided on the lower cover 200. This makes it easier for the slot 110 to be disassembled and cleaned along with the upper cover 100. However, in other embodiments, the arrangement can be reversed, that is, the splicing surface is provided on the upper cover 100, and the slot is provided on the lower cover 200.

[0084] like Fig.12 As shown, this embodiment also discloses a burner, which includes a base 400, an outer ring fire cover 300 and an inner ring fire cover, and a lower cover body 200 is connected to the base 400. The inner ring fire cover of this embodiment can be used for a stove.

[0085] The present invention facilitates cleaning of the slot hole 110 and reduces the attachment of water droplets. On the other hand, it increases the extension distance of the fire hole 101, thereby improving the flame stabilization performance under the condition of limited size. When performing energy efficiency conversion, less energy is lost to the outside in unit time.

[0086] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection 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, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. An inner ring fire cover, comprising a plurality of fire holes arranged around the axis of the inner ring fire cover, characterized in that: The inner ring fire cover includes a lower cover body and an upper cover body which are separably spliced ​​to each other along the height direction, and an open slot is formed on the surface of the upper cover body or the lower cover body, and the slot is closed by the splicing surface of the relative lower cover body or the upper cover body to form the fire hole, wherein the extension direction of the slot from its inner inlet to the outer outlet is set relative to the radial deviation of the inner ring fire cover to form a relative outward rotation extension.

2. The inner ring fire cover according to claim 1, characterized in that: The cross-sectional shape of the outer outlet presents different extension heights in the direction around the axis, and the cross-sectional shape of each outer outlet has a longer extension height on one side in the direction of outward extension, and a shorter extension height on the opposite direction, wherein the side with the longer extension height of each outer outlet exceeds the side with the shorter extension height of the adjacent outer outlet in the direction of the axis.

3. The inner ring fire cover according to claim 2, characterized in that: The cross-sectional shape of the outer outlet is a quadrilateral whose upper edge or lower edge is inclined in the direction of the axis.

4. The inner ring fire cover according to claim 3, characterized in that: The cross-sectional shape of each part inside the slot is a rectangular shape.

5. The inner ring fire cover according to claim 3, characterized in that: The cross-sectional shape of the outer outlet is a right-angled trapezoid.

6. The inner ring fire cover according to claim 1, characterized in that: The adjacent slots are partially overlapped and connected at one side close to the inner inlet.

7. The inner ring fire cover according to claim 6, characterized in that: The cross-sectional shape of the inner inlet presents different extension heights in the direction around the axis, the cross-sectional shape of each inner inlet is at a lower side on the direction of the outward rotation extension, and the cross-sectional shape of each inner inlet is at a higher side on the opposite direction of the outward rotation extension, and the connection between adjacent slots is formed between the splicing surface and the higher part of the slot.

8. The inner ring fire cover according to any one of claims 1 to 7, characterized in that: The slot hole gradually extends upward during the extension process from the inner inlet to the outer outlet, the splicing surface is overall in a conical shape, the slot end surface formed by the side wall of the slot hole is a corresponding conical shape, and the fire hole formed after the splicing surface and the slot hole are spliced ​​together extends upward from the inside to the outside.

9. The inner ring fire cover according to claim 8, characterized in that: A first annular limiting annular surface is formed on the splicing surface, and a second annular limiting annular surface is formed at a corresponding position of the groove end surface. The slopes of the first limiting annular surface and the second limiting annular surface are different from the overall slope of the splicing surface or the groove end surface.

10. The inner ring fire cover according to claim 1, characterized in that: The upper cover body or the lower cover body is provided with a positioning piece protruding along the direction of the axis, and the corresponding position of the lower cover body or the upper cover body is provided with a receiving portion recessed along the direction of the axis, the positioning piece and the receiving portion limit each other in a plane perpendicular to the direction of the axis, and the positioning piece and the receiving portion can be separated in the direction of the axis.

11. The inner ring fire cover according to claim 10, characterized in that: The inner side of the upper cover body has a protruding bump portion, and the positioning member is connected to the bump portion, wherein the ignition hole of the inner ring fire cover extends and passes through the bump portion.

12. The inner ring fire cover according to any one of claims 1 to 11, characterized in that: The slot is arranged on the upper cover, and the joint surface is arranged on the lower cover.

13. A burner, characterized in that: The burner comprises a base, an outer ring fire cover and an inner ring fire cover as described in any one of claims 1 to 12, and the lower cover body is connected to the base.

14. A cooking appliance, characterized in that: The stove comprises the inner ring fire cover as described in any one of claims 1-12.

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