Small flame cover and burner having the small flame cover

Abstract

The present invention provides a small fire cover and a burner having the small fire cover. The small fire cover has a gas channel inside, and the small fire cover also has a side wall, and a plurality of main fire holes arranged in a circumferential direction are arranged on the side wall, and the main fire holes connect the gas channel with the outside, and the main fire holes are through holes penetrating the side wall, and the diameter of the main fire holes is 2.2mm-2.8mm; a plurality of fire transfer holes arranged in a circumferential direction are also arranged on the side wall, and the fire transfer holes are countersunk holes penetrating the side wall, and the total depth of the countersunk holes is d, and the countersunk holes of the countersunk holes are close to the outer surface of the side wall, and the diameter of the countersunk holes is 1.6mm-2.4mm, and the depth of the countersunk holes is h, h=(1 / 2-1 / 3)d; the bottom hole of the countersunk hole is close to the inner surface of the side wall, and the diameter of the bottom hole is 1.2mm-1.6mm. The present invention can achieve an extreme small fire based on the design of the main fire hole and the fire transfer hole.

Description

Technical Field

[0001] The invention relates to the technical field of household gas stoves, in particular to a low-fire cover and a burner with the low-fire cover. Background Art

[0002] At present, the burner includes a high fire cover and a low fire cover. The low fire cover is located in the center of the burner (also called the center fire cover). The low fire cover carries the functions of ignition, flame transmission, heating, flameout protection, etc., and is one of the core components of the gas stove.

[0003] With the improvement of the quality of life, consumers need gas stoves to have a high-fire function and also need to add a center low-fire function. Therefore, the functional requirements for the center fire cover are more stringent, and its performance is still required to be stable when the gas volume is small. However, in the prior art, due to the diameter limitation of the small fire cover, it is difficult to maintain combustion when the firepower is as small as 350w, and accidental flameout or direct flameout occurs. In other words, it is difficult to achieve the extreme low fire, resulting in too much fire when making soup, and the soup is easy to overflow.

[0004] In view of this, it is necessary to improve the low fire cover so that it has an extreme low fire function. Summary of the invention

[0005] In order to at least partially solve the problems existing in the prior art, a small fire cover is provided, wherein the small fire cover has a gas channel therein, and the small fire cover also has a side wall, and a plurality of main fire holes arranged along the circumferential direction are provided on the side wall, the main fire holes connect the gas channel with the outside, the main fire holes are through holes penetrating the side wall, and the diameter of the main fire holes is 2.2mm~2.8mm; a plurality of fire transfer holes arranged along the circumferential direction are also provided on the side wall, the fire transfer holes are countersunk holes penetrating the side wall, the total depth of the countersunk holes is d, the countersunk holes of the countersunk holes are close to the outer surface of the side wall, and the diameter of the countersunk holes is 1.6mm~2.4mm, and the depth of the countersunk holes is h, h=(1 / 2~1 / 3)d; the bottom hole of the countersunk hole is close to the inner surface of the side wall, and the diameter of the bottom hole is 1.2mm~1.6mm.

[0006] The above-mentioned low-fire cover is provided with a main fire hole and a fire transfer hole, and the diameter of the main fire hole is 2.2mm-2.8mm, the fire transfer hole is a countersunk hole penetrating the side wall, the total depth of the countersunk hole is d, the diameter of the countersunk hole of the countersunk hole is 1.6mm-2.4mm, the depth of the countersunk hole is h, h=(1 / 2-1 / 3)d; the diameter of the bottom hole of the countersunk hole is 1.2mm-1.6mm, when the gas flow is insufficient, the fire transfer holes will be extinguished first, and the remaining part of the fire transfer holes and the main fire holes will burn, and the gas flow will continue to be reduced, so that only the main fire holes will burn, thereby realizing the extreme low-fire function. And, theoretically, based on such a setting, the main fire holes can be infinitely reduced until only two main fire holes for fire preservation are left. In this way, when the gas flow is reduced until all the fire transfer holes are extinguished, only two main fire holes for fire preservation can be left to burn, so that the load is close to very small.

[0007] For example, the flame transfer hole is inclined upward from the flame transfer hole entrance to the flame transfer hole exit, wherein the flame transfer hole entrance is located on the inner surface of the side wall, and the flame transfer hole exit is located on the outer surface of the side wall. This arrangement can facilitate the processing of the drill bit and can also ensure the gas rate for providing the flame, thereby improving the flame transfer efficiency.

[0008] For example, the clockwise angle β between the central axis of the flame transfer hole and the horizontal plane is 20° to 30°. This arrangement can further ensure the gas rate for providing the flame, and the flame transfer and continuous flame effect is strong.

[0009] Exemplarily, the main fire hole is inclined upward along the direction from the main fire hole entrance to the main fire hole exit, and the counterclockwise angle between the central axis of the main fire hole and the horizontal plane is ε, ε=β, wherein the main fire hole entrance is located on the inner surface of the side wall, and the main fire hole exit is located on the outer surface of the side wall. In this arrangement, the inclination angle of the main fire hole is the same as the inclination angle of the flame transfer hole, and the flames burning from the main fire hole can be quickly connected to each other through the flame transfer hole, which can fundamentally achieve a continuous flame effect.

[0010] For example, the main fire hole outlets are distributed in an annular shape on the outer surface of the side wall, and the centers of the main fire hole outlets are on the same horizontal plane; the fire transfer hole outlets are distributed in an annular shape on the outer surface of the side wall, and the centers of the fire transfer hole outlets are on the same horizontal plane, and the centers of the fire transfer hole outlets are lower than the centers of the main fire hole outlets. With such an arrangement, the flames from the main fire hole can be basically maintained on the same horizontal plane, and the flames from the fire transfer hole can also be basically maintained on the same horizontal plane, thereby meeting the requirement of uniform heating, and the fire transfer hole can directly connect to the main flame below the main fire hole, with a faster flame connection speed and a better flame connection effect.

[0011] Exemplarily, the fire transfer hole includes a first fire transfer hole and a second fire transfer hole, and the distance between the center of the first fire transfer hole and the center of the adjacent second fire transfer hole is 1.6mm to 2.1mm. Such a setting can, on the one hand, avoid the fire transfer hole being difficult to process, and the inner edge of the fire transfer hole being broken or punched; on the other hand, it can avoid the fire transfer hole being too large, which makes it difficult to transfer fire, resulting in some fire holes being out of flame, and then causing gas leakage, incomplete combustion of gas, and excessive smoke.

[0012] For example, the distance between the center of the first fire transfer hole and the center of the adjacent main fire hole is 1.9mm to 2.4mm. This arrangement can, on the one hand, avoid the fire transfer hole being difficult to process, and the inner edge of the fire transfer hole being broken or punched; on the other hand, it can avoid the fire transfer hole and the main fire hole being too far apart, which makes it difficult to transfer fire, causing some fire holes to be out of flame, and then causing gas leakage, incomplete combustion of gas, and excessive smoke.

[0013] Exemplarily, the small fire cover is provided with a flameout protection device outside, and the small fire cover is provided with a positioning piece for aligning the main fire hole with the flameout protection device. Based on the arrangement of the positioning piece, it can be ensured that the main fire hole is aligned with the flameout protection device, and the flame protection effect is good.

[0014] Exemplarily, the positioning member is a positioning notch, or a positioning column extending downward from the top of the small fire cover. The positioning notch and the positioning column can provide a position guide when the small fire cover is installed so as to be placed in place.

[0015] According to another aspect of the present invention, there is also provided a burner, comprising any one of the small flame covers described above.

[0016] The advantages and features of the present invention are described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following drawings of the present invention are used as part of the present invention for understanding the present invention. The drawings show the embodiments of the present invention and their descriptions, and are used to explain the principles of the present invention. In the drawings,

[0018] Figure 1 A longitudinal sectional view of a small fire cover according to an exemplary embodiment of the present invention;

[0019] Figure 2 FIG. 4 is a cross-sectional view of a small fire cover according to an exemplary embodiment of the present invention.

[0020] The above drawings include the following reference numerals:

[0021] 100, small fire cover; 110, gas channel; 102, top wall; 104, side wall; 120, main fire hole; 121, main fire hole entrance; 122, main fire hole exit; 130, fire transfer hole; 131, fire transfer hole entrance; 132, fire transfer hole exit; 1301, first fire transfer hole; 1302, second fire transfer hole; 140, small fire hole; 141, small fire hole entrance; 142, small fire hole exit; 150, positioning piece; 200, flameout protection device. DETAILED DESCRIPTION

[0022] In the following description, a large amount of details are provided so that the present invention can be thoroughly understood. However, it will be appreciated by those skilled in the art that the following description only exemplarily illustrates a preferred embodiment of the present invention, and the present invention can be implemented without one or more such details. In addition, in order to avoid confusion with the present invention, some technical features well known in the art are not described in detail.

[0023] In view of the problem that it is difficult to achieve a low flame limit in the prior art, the present invention provides a low flame cover. If necessary, a high flame cover can also adopt this structure. In order to understand the present invention as a whole, a burner using the low flame cover is first described.

[0024] For household gas stoves, its burner usually has a large fire cover and a small fire cover to form at least two rings of flames, thereby providing a variety of flame modes when the user uses it. Accordingly, the burner further includes a large fire distributor and a small fire distributor, as well as a large fire venturi and a small fire venturi. The small fire distributor is arranged at the center of the large fire distributor. The large fire cover and the small fire cover are respectively covered on the large fire distributor and the small fire distributor, and the large fire cover is located at the periphery of the small fire cover. The large fire venturi and the small fire venturi are respectively connected to the large fire distributor and the small fire distributor. The large fire distributor, the large fire cover and the large fire venturi form a large fire mixing chamber. The small fire distributor, the small fire cover and the small fire venturi form a small fire mixing chamber.

[0025] The following will combine Figure 1 to Figure 2 A small fire cover according to an embodiment of the present invention is described.

[0026] like Figure 1 As shown, the small fire cover 100 has a gas passage 110 therein. The gas passage 110 is a part of the gas mixing chamber. Specifically, in the illustrated embodiment, the small fire cover 100 may include a top wall 102 and a side wall 104. The side wall 104 extends downward from the periphery of the top wall 102 to enclose and form the gas passage 110. In this way, the gas passage 110 can be formed with a simple structure.

[0027] The side wall 104 is provided with a main fire hole 120 that connects the gas channel 110 with the outside, providing a main flame for heating. Specifically, in the illustrated embodiment, a circle of main fire holes 120 is provided along the circumferential direction of the small fire cover 100. The main fire holes 120 are through holes that penetrate the side wall 104. The diameter D of the main fire holes 120 can be 2.2 mm to 2.8 mm. The main fire hole inlet 121 is provided on the inner surface of the side wall 104, and the main fire hole outlet 122 is provided on the outer surface of the side wall 104. It should be noted that the "inner surface" and "outer surface" involved here are relative to the small fire cover 100 covering the fire distributor. After the small fire cover 100 is covered on the fire distributor, the exposed surface is the outer surface, and the unexposed surface is the inner surface.

[0028] The main flame holes 120 can be evenly spaced on the small flame cover 100. As required, the main flame holes 120 can also be unequally spaced on the small flame cover 100. Optionally, a circle of small flame holes 140 can be arranged along the circumferential direction of the small flame cover 100, and a small flame hole 140 can be correspondingly arranged below each main flame hole 120 to provide a flame stabilizing flame for the main flame generated by the large flame hole 120.

[0029] The side wall 104 is also provided with a circle of fire transfer holes 130 arranged in the circumferential direction. The fire transfer hole entrance 131 is provided on the inner surface of the side wall 104, and the fire transfer hole exit 132 is provided on the outer surface of the side wall 104. The fire transfer holes 130 are used to connect the flames between two adjacent main fire holes. It should be understood that in order to connect the flames between two adjacent main fire holes, at least one fire transfer hole 130 needs to be provided between two adjacent main fire holes. The fire transfer hole 130 is a countersunk hole penetrating the side wall 104, and the total depth of the countersunk hole is d. The countersunk hole of the countersunk hole is close to the outer surface of the side wall 104, and the diameter f of the countersunk hole is 1.6mm-2.4mm, and the depth of the countersunk hole is h, h=(1 / 2-1 / 3)d; the bottom hole of the countersunk hole is close to the inner surface of the side wall 104, and the diameter e of the bottom hole is 1.2mm-1.6mm.

[0030] The small fire cover 100 of this structure is provided with a main fire hole 120 and a fire transfer hole 130, and the diameter D of the main fire hole 120 is 2.2mm-2.8mm, the fire transfer hole 130 is a countersunk hole penetrating the side wall 104, the total depth of the countersunk hole is d, the diameter f of the countersunk hole is 1.6mm-2.4mm, the depth of the countersunk hole is h, h=(1 / 2-1 / 3)d; the diameter e of the bottom hole of the countersunk hole is 1.2mm-1.6mm. When the gas flow is insufficient, the fire transfer hole 130 will be extinguished first, and the remaining fire transfer holes and the main fire hole 120 will burn. Continuing to reduce the gas flow can make only the main fire hole 120 burn, thereby realizing the extreme small fire function. Moreover, theoretically, based on such a setting, the main fire holes 120 can be reduced infinitely until only two main fire holes for fire preservation are left. In this way, when the gas flow is reduced until all the fire transmission holes 130 are extinguished, only two main fire holes for fire preservation can be left burning, so that the load is close to being very small.

[0031] Exemplarily, the flame transfer hole 130 is inclined upward along the direction from the flame transfer hole inlet 131 to the flame transfer hole outlet 132. Such a configuration can facilitate the drill bit processing and also ensure the gas rate for providing the flame, thereby improving the flame transfer efficiency.

[0032] In a preferred embodiment, the clockwise angle β between the central axis of the flame transfer hole 130 and the horizontal plane is 20° to 30°, for example, 20°, 22°, 25°, 28°, 30°, etc. The applicant has found that such a setting can further ensure the gas rate for providing the flame, and the flame transfer and continuous flame effect is strong.

[0033] For example, the main fire hole 120 is inclined upward along the direction from the main fire hole entrance 121 to the main fire hole exit 122, and the counterclockwise angle between the central axis of the main fire hole 120 and the horizontal plane is ε, ε = β. In this way, the inclination angle of the main fire hole 120 is the same as the inclination angle of the flame transfer hole 130, and the flames burning from the main fire hole 120 can be quickly connected to each other through the flame transfer hole 130, which can fundamentally achieve a continuous flame effect.

[0034] For example, referring to Figure 2 and Figure 1, the main fire hole outlets 122 are distributed in an annular shape on the outer surface of the side wall 104, and the centers of the main fire hole outlets 122 are on the same horizontal plane; the fire transfer hole outlets 132 are distributed in an annular shape on the outer surface of the side wall 104, and the centers of the fire transfer hole outlets 132 are on the same horizontal plane, and the centers of the fire transfer hole outlets 132 are lower than the centers of the main fire hole outlets 122. With such a configuration, the flames from the main fire hole 120 can be basically maintained on the same horizontal plane, and the flames from the fire transfer hole 130 can also be basically maintained on the same horizontal plane, thereby meeting the requirement of uniform heating, and the fire transfer hole 130 can directly connect to the main flame below the main fire hole 120, with a faster flame connection speed and a better flame connection effect.

[0035] Exemplarily, the fire transfer hole 130 includes a first fire transfer hole 1301 and a second fire transfer hole 1302, which are mainly defined for the purpose of distinction, wherein the first fire transfer hole 1301 refers to a fire transfer hole adjacent to the main fire hole 120, and the second fire transfer hole 1302 refers to a fire transfer hole adjacent to the first fire transfer hole 1301, and the spacing between the center of the first fire transfer hole 1301 and the center of the second fire transfer hole 1302 is 1.6 mm to 2.1 mm. For example, it is 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, etc. The applicant has found that such a setting can, on the one hand, avoid the fire transfer hole 130 being difficult to process, and the inner edge of the fire transfer hole being broken or punched; on the other hand, it can avoid the fire transfer hole spacing being too large, which makes it difficult to achieve fire transfer, resulting in some fire holes being out of flame, and then causing gas leakage, incomplete combustion of gas, and excessive smoke. It should be noted that the distance between the center of the first flame transmission hole 1301 and the center of the second flame transmission hole 1302 here refers to the arc length l1 between the center of the first flame transmission hole 1301 and the center of the second flame transmission hole 1302 on the small flame cover diameter circle (see Figure 2 ).

[0036] Exemplarily, the distance between the center of the first fire hole 1301 and the center of the main fire hole 120 is 1.9mm to 2.4mm. For example, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, etc. The applicant has found that such a setting, on the one hand, can avoid the fire hole 130 being difficult to process, and the inner circle edge of the fire hole having holes or punching breaks; on the other hand, it can avoid the distance between the fire hole 130 and the main fire hole 120 being too large, making it difficult to achieve fire transfer, resulting in some fire holes being out of flame, and then causing gas leakage, incomplete combustion of gas, and excessive smoke. It should be noted that the distance between the center of the first fire hole 1301 and the center of the main fire hole 120 here refers to the arc length 12 (see the diameter circle of the small fire cover) between the center of the first fire hole 1301 and the center of the main fire hole 120. Figure 2 ).

[0037] For example, see again Figure 1 The small fire cover 100 is provided with a flameout protection device 200 on the outside, and the small fire cover 100 is provided with a positioning piece 150 for aligning the main fire hole 120 with the flameout protection device 200. The flameout protection device 200 is a thermocouple. When the main fire hole 120 near the flameout protection device 200 burns and burns the thermocouple, the thermocouple can generate negative electrons, thereby generating a current to attract the solenoid valve, thereby realizing the gas passage. Once the flame is extinguished, the current is interrupted and the gas passage is closed. The flameout protection device 200 can also be a sensing needle. When the main fire hole 120 near the flameout protection device 200 burns and burns the sensing needle, the fire conducts the sensing needle, the solenoid valve opens, and the gas passage can burn normally. Once the flame is extinguished, the sensing needle is non-conductive, the current is interrupted, and the gas passage is closed. Based on the setting of the positioning piece 150, it can be ensured that the main fire hole 120 is aligned with the flameout protection device 200, and the fire protection effect is good.

[0038] Figure 1 In the illustrated embodiment, the positioning member 150 is a positioning column extending downward from the top of the small fire cover 100 (the top of the small fire cover 100 corresponds to the top wall 102), and two positioning columns can be provided, wherein the angle θ between the two positioning columns can be set to 120°. Optionally, the positioning member 150 can also be a positioning notch. Based on the positioning notch and the positioning column setting, a position guide can be provided when the small fire cover is installed so as to be placed in place.

[0039] According to another aspect of the present invention, a burner is provided, which has any of the small flame covers as described above. In addition, the burner also includes a venturi and a flame distributor, etc. The venturi and the flame distributor may have various structures that are currently available or may appear in the future, which do not constitute a limitation on the protection scope of the present invention.

[0040] In the description of the present invention, it is necessary to understand that the orientation or positional relationship indicated by directional words such as "upper", "lower", "horizontal", "top", "bottom", etc. is usually based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention; the directional words "inside" and "outside" refer to the inside and outside relative to the contour of each component itself.

[0041] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between one or more components or features shown in the figure and other components or features. It should be understood that spatially relative terms include not only the orientation of the components as described in the figure, but also different orientations in use or operation. For example, if the components in the accompanying drawings are inverted as a whole, the components "above other components or features" or "above other components or features" will include the situation where the components are "below other components or structures" or "below other components or structures". Therefore, the exemplary term "above" may include both "above" and "below". In addition, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and this article is intended to include all of these situations.

[0042] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, parts, components and / or combinations thereof.

[0043] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0044] The present invention has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention. The protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A small fire cover, wherein the small fire cover has a gas channel therein, and the small fire cover also has a side wall, wherein the side wall is provided with a plurality of main fire holes arranged in a circumferential direction, wherein the main fire holes connect the gas channel with the outside, wherein: The main fire hole is a through hole penetrating the side wall, and the diameter of the main fire hole is 2.2 mm to 2.8 mm; The side wall is also provided with a plurality of fire transfer holes arranged in a circumferential direction, the fire transfer holes are countersunk holes penetrating the side wall, the total depth of the countersunk holes is d, the countersunk holes of the countersunk holes are close to the outer surface of the side wall, and the diameter of the countersunk holes is 1.6 mm to 2.4 mm, the depth of the countersunk holes is h, and h=(1 / 2 to 1 / 3) d; the bottom hole of the countersunk holes is close to the inner surface of the side wall, and the diameter of the bottom hole is 1.2 mm to 1.6 mm; The fire transmission hole is inclined upward along the direction from the fire transmission hole entrance to the fire transmission hole exit, and the angle between the central axis of the fire transmission hole and the horizontal plane in the clockwise direction is β; The main fire hole is inclined upward along the direction from the main fire hole entrance to the main fire hole exit, and the counterclockwise angle between the central axis of the main fire hole and the horizontal plane is ε, ε=β, wherein the main fire hole entrance is located on the inner surface of the side wall, and the main fire hole exit is located on the outer surface of the side wall.

2. The small fire cover according to claim 1, characterized in that: The inlet of the fire transmission hole is located on the inner surface of the side wall, and the outlet of the fire transmission hole is located on the outer surface of the side wall.

3. The small fire cover according to claim 2, characterized in that: The angle β is 20° to 30°.

4. The small fire cover according to claim 1, characterized in that: The main fire hole outlet is distributed in a ring shape on the outer surface of the side wall, and the centers of the main fire hole outlets are on the same horizontal plane; the fire transfer hole outlet is distributed in a ring shape on the outer surface of the side wall, and the centers of the fire transfer hole outlets are on the same horizontal plane, and the center of the fire transfer hole outlet is lower than the center of the main fire hole outlet.

5. The small fire cover according to any one of claims 1 to 4, characterized in that: The fire transfer holes include a first fire transfer hole and a second fire transfer hole, and the distance between the center of the first fire transfer hole and the center of the adjacent second fire transfer hole is 1.6 mm to 2.1 mm.

6. The small fire cover according to claim 5, characterized in that: The distance between the center of the first fire transfer hole and the center of the adjacent main fire hole is 1.9 mm to 2.4 mm.

7. The small fire cover according to claim 5, characterized in that: The small fire cover is provided with a flameout protection device outside, and the small fire cover is provided with a positioning piece for aligning the main fire hole with the flameout protection device.

8. The small fire cover according to claim 7, characterized in that: The positioning piece is a positioning notch, or a positioning column extending downward from the top of the small fire cover.

9. A burner, characterized in that: The invention comprises a small fire cover as claimed in any one of claims 1 to 8.

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