CN210118745U - Fire cover and combustor with same - Google Patents

Abstract

The utility model provides a fire lid and have combustor of this fire lid. The fire cover is internally provided with a gas channel, the fire cover is provided with large fire holes arranged along the circumferential direction and small fire holes positioned between the adjacent large fire holes, the large fire holes and the small fire holes communicate the gas channel with the outside, wherein at least one of the small fire holes inclines downwards along the direction from the small fire hole inlet to the small fire hole outlet. According to the utility model discloses a fire lid when using, the gas need experience reverse turn when getting into little fire hole from gas passage to reduce the motion potential energy, thereby reduce the gas velocity of flow, even also can avoid flame to break away from little fire hole burning under the condition of gas pressure increase. Therefore, the gas can be burnt on the surface of the small fire hole, and the periphery of the small fire hole is rapidly heated. Due to the preheating effect of the small fire holes, the flame of the large fire hole can be pulled back to the surface of the large fire hole for combustion, and the flame is prevented from leaving. Therefore, the small fire holes can play a good flame stabilizing effect.

Description

Fire cover and combustor with same

Technical Field

The utility model relates to a domestic gas cooking utensils technical field specifically relates to a fire lid and have combustor of this fire lid.

Background

At present, two burners are generally arranged on a household gas cooker. Each burner includes a distributor, a venturi connected to the distributor, and a fire cover covering the distributor, and a mixing chamber is formed by the three. The fire cover is provided with a circle of large fire holes and a circle of small fire holes, and the large fire holes and the small fire holes are inclined upwards along the directions from the respective inlets to the respective outlets. The gas in the gas mixing chamber flows out of the fire holes and is combusted on the surface of the fire holes. During combustion, the small fire holes are small in cross sectional area, and resistance of gas is large, so that the small fire holes can be combusted on the surfaces of the small fire holes, and the periphery of the small fire holes can be rapidly heated. Compared with the small fire holes, the large fire holes have larger cross-sectional areas, and the gas flows out faster, so that burning flames are easy to separate from the surfaces of the large fire holes, namely flame separation. Due to the preheating effect of the small fire, the flame of the large fire hole can be pulled back to the surface of the large fire hole for combustion.

However, since the gas source is relatively complex, the gas pressure in the gas mixing chamber is likely to be relatively high during the actual use. In this case, the gas flow rate through the fire hole increases. At this time, the flame may be burned off the surface of the small fire hole, and thus a good flame stabilizing effect may not be obtained.

SUMMERY OF THE UTILITY MODEL

To at least partially solve the problems in the prior art, a fire lid is provided. The fire cover is internally provided with a gas channel, the fire cover is provided with large fire holes arranged along the circumferential direction and small fire holes positioned between the adjacent large fire holes, the large fire holes and the small fire holes communicate the gas channel with the outside, wherein at least one of the small fire holes inclines downwards along the direction from the small fire hole inlet to the small fire hole outlet. When the fire cover is used, gas in the gas channel respectively enters the big fire hole and the small fire hole. When the gas enters the small fire hole from the gas channel, the second gas flow direction in the small fire hole is bent downwards relative to the first gas flow direction in the gas channel, so that the gas needs to undergo reverse turning when entering the small fire hole so as to reduce the motion potential energy, thereby reducing the gas flow rate, and avoiding the flame from escaping from the small fire hole to burn even under the condition of increasing the gas pressure. Therefore, the gas can be burnt on the surface of the small fire hole, and the periphery of the small fire hole is rapidly heated. Due to the preheating effect of the small fire holes, the flame of the large fire hole can be pulled back to the surface of the large fire hole for combustion, and the flame is prevented from leaving. Therefore, the small fire holes can play a good flame stabilizing effect.

Preferably, the small fire hole outlet is close to the large fire hole outlet of the large fire hole, and the center of the small fire hole outlet is lower than the center of the large fire hole outlet. Therefore, the small fire holes can directly heat the main flame at the root parts of the large fire holes, the heating speed is higher, and the generation of flame separation is avoided.

Preferably, the included angle between the central axis of the small fire hole and the vertical direction is 65-80 degrees. With the arrangement, the flame stabilizing effect is better.

Preferably, the big fire hole is inclined upwards along the direction from the big fire hole inlet to the big fire hole outlet. In this way, the gas velocity for providing the main flame can be ensured, thereby improving the thermal efficiency.

Preferably, the big fire hole inlet of the big fire hole is arranged below the small fire hole inlet. Therefore, the structure of the fire cover can be more compact, the outlet of the small fire hole can be close to the outlet of the large fire hole as much as possible, and a good flame stabilizing effect is achieved.

Preferably, the included angle between the central axis of the big fire hole and the vertical direction is 45-52 degrees. So configured, the gas velocity for providing the main flame can be ensured.

Preferably, the small fire hole is provided with a first section close to the inlet of the small fire hole and a second section close to the outlet of the small fire hole, and the cross-sectional area of the first section is smaller than that of the second section. Therefore, the gas outflow speed at the outlet of the small fire hole can be further reduced, and the flame separation caused by overlarge gas pressure in the gas channel is avoided.

Preferably, the small fire holes have a gradually increasing cross-sectional area from the small fire hole inlets to the small fire hole outlets. Therefore, the gas outflow speed at the small fire hole outlet of the small fire hole can be further reduced, and the flame separation caused by the overlarge gas pressure in the gas channel is avoided.

Preferably, the diameter of the inlet of the small fire hole is 1.0mm-1.3mm, and the diameter of the outlet of the small fire hole is 1.5mm-2.0 mm. The applicant has found that when the diameters of the first and second sections are within the above range, the gas outflow rate at the outlet of the small fire hole can be further reduced, and the occurrence of flame-out due to an excessive gas pressure in the gas passage can be avoided.

According to another aspect of the present invention, there is also provided a burner comprising any one of the fire covers as described above.

A series of concepts in a simplified form are introduced in the disclosure, which will be described in further detail in the detailed description section. The summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

The advantages and features of the present invention are described in detail below with reference to the accompanying drawings.

Drawings

The following drawings of the present invention are used herein as part of the present invention for understanding the present invention. There are shown in the drawings, embodiments and descriptions thereof, which are used to explain the principles of the invention. In the drawings, there is shown in the drawings,

fig. 1 is a perspective view of a fire cover according to an exemplary embodiment of the present invention;

FIG. 2 is a perspective view of another angle of the fire cover shown in FIG. 1;

FIG. 3 is a cross-sectional view of the fire cover shown in FIG. 1 cut through to the small fire hole; and

fig. 4 is a sectional view of the fire cover shown in fig. 1 cut into a fire hole.

Detailed Description

In the following description, numerous details are provided to provide a thorough understanding of the present invention. One skilled in the art, however, will understand that the following description illustrates only a preferred embodiment of the invention and that the invention may be practiced without one or more of these details. In addition, some technical features that are well known in the art are not described in detail in order to avoid obscuring the present invention.

To the flame problem that leaves that exists among the prior art, the utility model provides a fire lid, especially big fire lid. This configuration can also be used for small fire lids if desired. In order to understand the present invention as a whole, a burner using the fire cover will be described first.

For a household gas range, a burner thereof generally 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 used by a user. Accordingly, the burner further comprises a large flame distributor and a small flame distributor, and a large flame venturi and a small flame venturi. The small fire distributor is arranged at the center of the large fire distributor. The big fire cover and the small fire cover are respectively covered on the big fire distributor and the small fire distributor, and the big fire cover is positioned at the periphery of the small fire cover. The big fire venturi and the small fire venturi are respectively connected to the big fire distributor and the small fire distributor. The big fire distributor, the big fire cover and the big fire venturi form a big fire gas mixing chamber. The small fire distributor, the small fire cover and the small fire venturi form a small fire gas mixing chamber.

A fire cover according to an embodiment of the present invention will be described with reference to fig. 1 to 4.

As shown in fig. 1 and 2, the fire cover 100 has a gas passage 110 therein. The gas channel 110 serves as a part of a gas mixing chamber. Specifically, in the illustrated embodiment, the fire lid 100 may include an annular top wall 102, an inner sidewall 104, and an outer sidewall 106. Inner and outer side walls 104 and 106 extend downwardly from the inner and outer peripheries of annular top wall 102, respectively, to enclose a gas passage 110. In this manner, the gas channel 110 can be formed with a simple structure. The thickness of outer sidewall 106 may be greater than the thickness of inner sidewall 104.

As shown in fig. 1 and 2, the fire cover 100 is provided with a big fire hole 120 and a small fire hole 130 which communicate the gas passage 110 with the outside. Specifically, in the illustrated embodiment, a circle of large fire holes 120 and a circle of small fire holes 130 are provided along the circumferential direction of the fire cover 100. The large fire holes 120 and the small fire holes 130 may be distributed at equal intervals on the fire cover 100. The large fire holes 120 and the small fire holes 130 may be distributed on the fire cover 100 at unequal intervals, as needed. Alternatively, the large fire holes 120 may not be provided corresponding to the positions of the legs (generally, four legs) of the pot holder, and the small fire holes 130 may be provided at the positions. Of course, the present invention does not exclude the embodiment that the large fire holes 120 are also arranged at the positions corresponding to the supporting legs of the pot rack.

The cross-sectional area of the large fire hole 120 is larger than that of the small fire hole 130. For example, the diameter of the large fire hole 120 may be 2.5mm to 3.1mm, and the diameter of the small fire hole 130 may be 1.3mm to 2.0 mm. The large fire hole 120 is a main fire hole, and provides a main flame for heating. The small flame holes 130 are flame-stabilizing holes for providing flame-stabilizing flames to the main flames generated from each of the large flame holes 120. The big fire hole inlet 121 of the big fire hole 120 and the small fire hole inlet 131 of the small fire hole 130 are located on the inner surface of the fire cover 100 and communicate with the gas passage 110, and the big fire hole outlet 122 of the big fire hole 120 and the small fire hole outlet 132 of the small fire hole 130 are located on the outer surface of the fire cover 100. Specifically, in the illustrated embodiment, the large fire holes 120 and the small fire holes 130 are both disposed on the outer sidewall 106 of the fire lid 100 and extend through the outer sidewall 106. Both the large fire hole inlet 121 and the small fire hole inlet 131 are provided on the inner surface of the outer sidewall 106, and both the large fire hole outlet 122 and the small fire hole outlet 132 are provided on the outer surface of the outer sidewall 106. It should be noted that reference herein to "inner surface" and "outer surface" is with respect to the fire cover 100 being placed over the distributor, with the exposed surface being the outer surface and the unexposed surface being the inner surface after the fire cover 100 is placed over the distributor.

As shown in fig. 2-3, the combustion gas flows in the gas passage 110 to the small fire hole inlet 131 along the first gas flow direction D1, then bends downward in the small fire hole 130, and flows to the small fire hole outlet 132 along the second gas flow direction D2.

It should be noted that, in addition to the small fire holes 130 located between two adjacent large fire holes 120, other small fire holes, such as a small fire hole (not shown) correspondingly located right below the large fire hole 120, may be provided on the fire cover 100. In addition, between two adjacent big fire holes 120, a small fire hole 130 may be provided as shown. In other embodiments not shown, a plurality of small fire holes 130 may be provided. The plurality of small fire holes 130 may be provided such that a portion (e.g., one) or all thereof is bent downward in the gas flow direction.

In use, the gas in the gas channel 110 enters the large fire hole 120 and the small fire hole 130 respectively. When the gas enters the small fire holes 130 from the gas channel 110, since the second gas flow direction D2 in the small fire holes 130 is bent downward relative to the first gas flow direction D1 in the gas channel 110, the gas needs to undergo reverse turning when entering the small fire holes 130 to reduce the kinetic potential energy, thereby reducing the gas flow rate and preventing the flame from escaping from the small fire holes 130 to burn even if the gas pressure is increased. Thus, the gas can be burned on the surface of the small fire hole 130 to rapidly heat the periphery of the small fire hole 130. Due to the preheating function of the small fire holes 130, the flame of the large fire hole 120 can be pulled back to the surface of the large fire hole 120 for combustion, and the generation of the flame can be avoided. Thus, the small fire holes 130 can provide a good flame stabilizing effect.

Preferably, the central axis of the small fire hole 130 is at an angle of 65-80 degrees to the vertical. For example, 65 degrees, 68 degrees, 70 degrees, 75 degrees, 79 degrees, 80 degrees, etc. The applicant finds that the flame stabilizing effect is good when the included angle between the central axis of the small fire hole 130 and the vertical direction is within the above range.

Preferably, the small fire hole outlet 132 is located near the large fire hole outlet 122, and the center of the small fire hole outlet 132 is lower than the center of the large fire hole outlet 122. Therefore, the small fire holes 130 can directly heat the main flame at the root of the large fire hole 120, the heating speed is faster, the function of a power source of gas chemical reaction is achieved, the flame of the large fire hole 120 can rapidly generate chemical reaction, the originally separated flame can be pulled back to the surface of the large fire hole 120 for combustion, and the generation of flame separation is avoided.

Preferably, as shown in fig. 2 and 4, the bullports 120 are inclined upwardly in the direction from the bullport inlet 121 to the bullport outlet 122. That is, as shown in fig. 4, the first gas flow direction D1 in the gas passage 110 and the third gas flow direction D3 in the fire hole 120 are at an obtuse angle. The gas enters the big fire hole 120 from the gas channel 110, and then flows out in an obliquely upward direction, and generates a main flame that is jetted upward at the big fire hole outlet 122. In this way, the gas velocity for providing the main flame can be ensured, thereby improving the thermal efficiency. Further preferably, the central axis of the fire hole 120 is at an angle of 45-52 degrees to the vertical. For example, 45 degrees, 47 degrees, 50 degrees, 52 degrees, etc. The applicant found that the gas velocity for providing the main flame can be secured when the angle between the first gas flow direction D1 in the gas passage 110 and the third gas flow direction D3 in the fire hole 120 is within the above range.

Further preferably, as shown in fig. 2, in the case where the big fire hole 120 is provided to be inclined upward in the direction from the big fire hole inlet 121 to the big fire hole outlet 122, the big fire hole inlet 121 is provided below the small fire hole inlet 131. In this way, the fire cover 100 can be made more compact, and the small fire hole outlet 132 can be as close to the large fire hole outlet 122 as possible, which provides a good flame stabilizing effect.

Preferably, the small fire hole 130 has a first section near the small fire hole inlet 131 and a second section near the small fire hole outlet 132, wherein the cross-sectional area of the first section is smaller than that of the second section. As such, a step is formed on the inner sidewall of the small fire hole 130 so that the small fire hole 130 has an increased cross-sectional area along the flow direction of the gas therein. Therefore, the gas outflow speed at the small fire hole outlet 132 can be further reduced, and the occurrence of flame-out due to excessive gas pressure in the gas channel 110 can be avoided.

Preferably, the small fire holes 130 may also have a gradually increasing cross-sectional area from the small fire hole inlets 131 to the small fire hole outlets 132. I.e., the small fire holes 130 have a gradually increasing cross-sectional area in the flow direction of the gas therein. Therefore, the gas outflow speed at the small fire hole outlet 132 can also be further reduced, and the occurrence of flame-out due to excessive gas pressure in the gas channel 110 can be avoided.

Alternatively, the diameter of the small fire hole inlets 131 may be 1.0mm to 1.3mm, for example, 1.0mm, 1.1mm, 1.2mm, 1.3 mm. The diameter of the small fire hole outlet 132 may be 1.5mm to 2.0mm, e.g., 1.5mm, 1.6mm, 1.8mm, 1.9mm, 2.0 mm. The applicant has found that when the diameters of the first and second sections are within the above range, the gas outflow rate at the outlet of the small fire hole can be further reduced, and the occurrence of flame-out due to an excessive gas pressure in the gas passage can be avoided.

According to another aspect of the present invention, there is also provided a burner having any one of the fire covers as described above. Besides, the burner also comprises a venturi, a distributor and the like. The venturi and the distributor may have various structures, present or possible in the future, which do not constitute a limitation of the scope of protection of the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front", "back", "upper", "lower", "left", "right", "horizontal", "vertical", "horizontal" and "top", "bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the scope of the present invention.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe the spatial relationship of one or more components or features shown in the figures to other components or features. It is to be understood that the spatially relative terms are intended to encompass not only the orientation of the component as depicted in the figures, but also different orientations of the component in use or operation. For example, if an element in the drawings is turned over in its entirety, the articles "over" or "on" other elements or features will include the articles "under" or "beneath" the other elements or features. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". Further, these components or features may also be positioned at various other angles (e.g., rotated 90 degrees or other angles), all of which are intended to be encompassed herein.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, elements, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The present invention has been described in terms of the above embodiments, but it is to be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many more modifications and variations are possible in light of the teaching of the present invention and are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A fire cover (100) having a gas channel (110) therein, the fire cover being provided with large fire holes (120) arranged in a circumferential direction and small fire holes (130) located between adjacent large fire holes, the large fire holes and the small fire holes communicating the gas channel with the outside, wherein at least one of the small fire holes is inclined downward in a direction from a small fire hole inlet (131) to a small fire hole outlet (132).

2. The fire cover of claim 1, wherein the small fire hole outlet (132) is adjacent to the large fire hole outlet (122) of the large fire hole, and the center of the small fire hole outlet is lower than the center of the large fire hole outlet.

3. The fire cover according to claim 1, wherein the central axis of the small fire hole (130) is at an angle of 65-80 degrees to the vertical direction.

4. The fire cover of claim 1, wherein the fire hole (120) is inclined upward in a direction from the fire hole inlet (121) to the fire hole outlet (122).

5. The fire cover according to claim 4, wherein the large fire hole inlet (121) is disposed below the small fire hole inlet (131).

6. The fire cover according to claim 5, wherein the central axis of the big fire hole (120) is at an angle of 45-52 degrees to the vertical direction.

7. The fire cover according to claim 1, wherein the small fire holes (130) have a first section near the small fire hole inlets (131) and a second section near the small fire hole outlets (132), the first section having a smaller cross-sectional area than the second section.

8. The fire cover of claim 1, wherein the small fire holes have a gradually increasing cross-sectional area from the small fire hole inlets (131) to the small fire hole outlets (132).

9. The fire cover according to claim 7 or 8, wherein the diameter of the small fire hole inlet (131) is 1.0mm to 1.3mm, and the diameter of the small fire hole outlet (132) is 1.5mm to 2.0 mm.

10. Burner, characterized in that it comprises a fire cover according to any one of claims 1 to 9.

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