Center fire cap and burner including center fire cap

Abstract

The present application provides a central fire cover and a burner comprising the central fire cover, the central fire cover having a central passage, a fire hole, a gas cavity, a gas outlet passage, a gas blowing passage and an annular groove communicating with the fire hole and the outside, wherein the central fire cover comprises a lower cover body and an upper cover body arranged above the lower cover body, the gas cavity is formed between the upper cover body and the lower cover body, the central passage is arranged on the lower cover body and communicates with the gas cavity through the gas outlet passage, and the gas cavity communicates with the annular groove through the gas blowing passage. The present application can reduce the risk of flame separation and avoid the problem of fire hole blockage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household gas stoves, in particular to a center fire cover and a burner comprising the same. BACKGROUND

[0002] In the process of cooking food with a gas stove, food overflow, oil-water mixture splashing and other situations are inevitable, especially when making porridge, a little carelessness will cause the pot to overflow. The overflowed food residues either directly block the fire cover fire hole channel, causing ignition failure, or flow down along the fire cover fire hole channel into the gas chamber inside the fire cover, causing the accumulation of solid residues in the gas chamber, making the burner performance poor or unable to ignite, affecting the use of the gas stove.

[0003] When the existing fire cover fire hole is blocked by oil stains, food residues and the like, manual dredging is often required, and some people use it for a long time without dredging, causing the stove to be unable to ignite, and finally feedback to the manufacturer for replacement, which is time-consuming and laborious. SUMMARY

[0004] The main purpose of the present application is to provide a center fire cover to solve the problem that the fire cover is easily blocked in the fire hole when food overflow, oil-water mixture splashing and other situations occur in the prior art.

[0005] In order to achieve the above purpose, the present application provides a center fire cover, which has a center channel and a fire hole, and also has a gas cavity, a gas outlet channel, a gas blowing channel and an annular groove communicating with the outside of the fire hole; wherein the center fire cover comprises a lower cover body and an upper cover body arranged above the lower cover body, the gas cavity is formed between the upper cover body and the lower cover body, the center channel is arranged on the lower cover body and communicates with the gas cavity through the gas outlet channel, and the gas cavity communicates with the annular groove through the gas blowing channel.

[0006] The center fire cover described above, when burning normally, due to the arrangement of the annular groove, a stable flame ring can be formed at the bottom of the annular groove, thereby reducing the risk of flame separation; when food overflow or oil-water mixture splashing occurs, the liquid will not flow directly into the center fire cover, but will flow into the annular groove to form a liquid film, at this time, the gas in the gas cavity will be extruded above the annular groove through the gas blowing channel, thereby breaking the liquid film and allowing the gas to flow normally, thereby avoiding the problem of fire hole blockage.

[0007] Exemplarily, the width of the annular groove is 1mm-3mm. In this way, not only the problem of insufficient secondary air intake and the inability of the gas to form an effective stable flame ring is avoided, but also the problems of too long gas accumulation time and excessive gas consumption are avoided.

[0008] Exemplarily, the air cavity has a depth t of 1mm-4mm. In this way, not only the problem of affecting the combustion performance caused by too much gas gathered in the air cavity due to the air cavity being too large is avoided, but also the problem of the generated extrusion force being too small to break the liquid film caused by the air cavity being too small is avoided.

[0009] Exemplarily, the central fire cover has a central axis, and the air blowing channel and the central axis have an included angle of 0°-45°. The included angle between the air blowing channel and the central axis is, for example, 0°, 15°, 30°, 45°, and the like. Since the central axis of the central fire cover is vertical during use, the gas in the air cavity generates extrusion above the annular groove through the air blowing channel, which is more likely to break the liquid film.

[0010] Exemplarily, the fire hole, the air outlet channel, and the air blowing channel are all arranged on the lower cover body, and the annular groove extends upward from the lower end surface of the lower cover body to communicate with the fire hole. In this way, the fire hole, the air outlet channel, the air blowing channel, and the annular groove are all arranged on the lower cover body, which is convenient for processing.

[0011] Exemplarily, the annular groove divides the fire hole into a first hole section and a second hole section. In this way, during normal combustion, a part of the gas can directly burn out of the fire through the fire hole from the central channel, and another part of the gas enters the air cavity through the air outlet channel and then flows into the annular groove through the air blowing channel, thereby forming a stable flame ring at the bottom of the annular groove. In this way, not only the combustion efficiency is ensured, but also the risk of flame separation is reduced.

[0012] Exemplarily, the lower cover body includes an inner side wall, a top wall, and an outer side wall, the top wall and the inner side wall enclose the central channel, the inner side wall, the top wall, and the outer side wall enclose the annular groove, the first hole section is located on the inner side wall, the second hole section is located on the outer side wall, and the air outlet channel and the air blowing channel are both arranged on the top wall. In this way, the lower cover body not only has a simple structure, but also is conducive to forming the air outlet channel and the air blowing channel.

[0013] Exemplarily, the top wall has a central hole, an outer ring located outside the air blowing channel, and an inner ring located between the central hole and the outer ring; the upper cover body has an insertion part, a top part, and a side part, the insertion part is inserted into the central hole, the side part is placed on the outer ring, the top part has a lower surface, the inner ring has a top surface, and the lower surface and the top surface have a gap to form the air cavity. In this way, not only can the upper cover body be stably covered on the lower cover body, but also the air cavity can be formed with a simple structure.

[0014] Exemplarily, the air outlet passage comprises a plurality of air outlet holes, centers of the plurality of air outlet holes are located on a same circle D1, and the plurality of air outlet holes are uniformly distributed; the air blowing passage comprises a plurality of air inlet holes, centers of the plurality of air inlet holes are located on a same circle D2, D2>D1, and the plurality of air inlet holes are uniformly distributed. In this way, it can be avoided that too much gas enters the air cavity through the air outlet passage during normal combustion, thereby affecting the combustion performance.

[0015] Exemplarily, the air outlet passage is a through hole located at the center of the lower cover body; the air blowing passage comprises a plurality of air inlet holes, centers of the plurality of air inlet holes are located on a same circle D2, and the plurality of air inlet holes are uniformly distributed, or the air blowing passage is an annular through groove. In this way, it can be avoided that too much gas enters the air blowing passage through the air cavity during normal combustion, thereby affecting the combustion performance.

[0016] Exemplarily, the air outlet passage is an annular through groove; the air blowing passage is an annular through groove. In this way, not only the purposes of connecting the central passage with the air cavity and connecting the air cavity with the annular groove can be achieved, but also the structure is simple and convenient for processing.

[0017] Exemplarily, the insertion portion and the central hole are sealingly connected through threads and / or sealing rings. In this way, on the one hand, the upper cover body can be stably arranged on the lower cover body, and on the other hand, the air tightness of the air cavity can be ensured, so that the gas in the air cavity can only enter and exit through the air outlet passage and the air blowing passage.

[0018] Exemplarily, the annular groove divides the lower cover body into an inner ring body and an outer ring body, and the fire hole is arranged on the outer ring body. In this way, during normal combustion, the gas enters the air cavity through the air outlet passage, and then is branched through the air blowing passage, a part of the gas directly combusts through the fire hole, and another part of the gas flows into the annular groove, so that a stable flame ring is formed at the bottom of the annular groove, thereby achieving the purposes of ensuring the combustion efficiency and reducing the risk of flame separation.

[0019] Exemplarily, the lower cover body has a lower side wall, the upper cover body has an upper side wall surrounding the lower side wall, the upper side wall has an inner side surface, the lower side wall has an outer side surface, and the air blowing passage and the annular groove are formed between the inner side surface and the outer side surface. In this way, the air blowing passage and the annular groove can be formed in a simple manner.

[0020] Exemplarily, the fire hole is arranged on the upper side wall. In this way, the fire hole is formed on the upper cover body, during normal combustion, the gas enters the air cavity through the air outlet passage, and then is branched through the air blowing passage, a part of the gas directly combusts through the fire hole, and another part of the gas flows into the annular groove, so that a stable flame ring is formed at the bottom of the annular groove, thereby achieving the purposes of ensuring the combustion efficiency and reducing the risk of flame separation.

[0021] Exemplarily, the fire hole comprises a first hole section arranged on the lower sidewall and a second hole section arranged on the upper sidewall. In this way, the upper cover body and the lower cover body are both formed with a partial fire hole, and when normally burning, a part of the gas can directly burn out of the fire hole from the central passage, and another part of the gas enters the air cavity through the gas outlet passage and then flows into the annular groove through the air blowing passage, so as to form a stable flame ring at the bottom of the annular groove. In this way, not only the burning efficiency can be ensured, but also the risk of off-flame can be reduced.

[0022] According to another aspect of the present application, there is also provided a burner comprising any one of the central fire covers as described above. Since the central fire cover has the beneficial effects as described above, the burner provided with the central fire cover also has the beneficial effects as described above.

[0023] The advantages and features of the present application will be explained in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] The following drawings are included herewith as part of the present application to assist in understanding the application. The application is described and explained with additional specificity and detail through the use of the accompanying drawings in which:

[0025] Figure 1 is an exploded schematic view of the central fire cover according to an exemplary embodiment of the present application;

[0026] Figure 2 is a schematic view of the internal structure of the central fire cover in Figure 1 ;

[0027] Figure 3 is a schematic view of the internal structure of the central fire cover according to another exemplary embodiment of the present application; Figure 1

[0028] Figure 4 is a schematic view of the internal structure of the central fire cover according to another exemplary embodiment of the present application; Figure 3

[0029] Figure 5 is a schematic view of the internal structure of the central fire cover according to another exemplary embodiment of the present application; Figure 1

[0030] Figure 6 is a schematic view of the internal structure of the central fire cover according to another exemplary embodiment of the present application;

[0031] Figure 7 is a schematic view of the internal structure of the central fire cover according to another exemplary embodiment of the present application;

[0032] Figure 8 is a schematic view of the internal structure of the central fire cover according to another exemplary embodiment of the present application;

[0033] Figure 9 ​​​Fig. 2 is an exploded view of the center burner cap according to an exemplary embodiment of the present application;

[0034] Figure 10 Fig. 3 is a cross-sectional view of the center burner cap of Fig. 1. Figure 9

[0035] Wherein the above figures include the following reference numerals:

[0036] 110 - lower cap body

[0037] 101 - central passage

[0038] 102 - burner hole

[0039] 1021 - first hole section

[0040] 1022 - second hole section

[0041] 102' - lower ring burner hole

[0042] 103 - air outlet passage

[0043] 1031 - air outlet hole

[0044] 104 - air blowing passage

[0045] 1041 - air inlet hole

[0046] 1042 - air blowing outlet

[0047] 1043 - air blowing inlet

[0048] 105 - annular groove

[0049] 111 - inner side wall

[0050] 111' - lower side wall

[0051] 1111' - outer side surface

[0052] 112 - top wall

[0053] 1121 - central hole

[0054] 11201 - middle top surface

[0055] 11202 - step surface

[0056] 1122 - outer ring

[0057] 1123 - inner ring

[0058] 11231 - top surface

[0059] 113 - outer side wall

[0060] 114 - catch groove ​

[0061] 120 - upper cover body

[0062] 121 - insertion portion

[0063] 122 - top portion

[0064] 1221 - lower surface

[0065] 123 - side portion

[0066] 123' - upper side wall

[0067] 1231' - inner side surface

[0068] 1201 - lower surface of cover body

[0069] 124 - brim portion

[0070] 130 - air cavity

[0071] t - gap

[0072] a - width of annular groove

[0073] p - thickness of outer side wall DETAILED DESCRIPTION

[0074] In the following description, numerous specific details are provided to provide a thorough understanding of the present application. One of ordinary skill in the art will recognize, however, that the application can be practiced without one or more of the specific details. Also, techniques and structures that would be known to one of ordinary skill in the art are not described in detail to avoid obscuring the present application. In other instances, various techniques and structures have not been described in detail in order to not unnecessarily obscure the present application.

[0075] For a household gas stove, its burner usually has a large fire cover (also called outer ring fire cover) and a small fire cover (also called center fire cover) to form at least two ring flames, thereby providing multiple flame modes for users to use. Accordingly, the burner further includes a large fire damper and a small fire damper, and a large fire venturi and a small fire venturi. The small fire damper is arranged at the center of the large fire damper. The large fire cover and the small fire cover are respectively covered on the large fire damper and the small fire damper, and the large fire cover is located at the outer periphery of the small fire cover. The large fire venturi and the small fire venturi are respectively connected to the large fire damper and the small fire damper. The large fire damper forms a large fire mixing chamber with the large fire cover and the large fire venturi. The small fire damper forms a small fire mixing chamber with the small fire cover and the small fire venturi. Embodiment 1

[0076] The following will be described in conjunction with FIGS. 1 to Figure 6 A center fire cover of an embodiment of the present application is described.

[0077] The central fire cover comprises a lower cover body 110 and an upper cover body 120 arranged above the lower cover body 110. The lower cover body 110 has a central passage 101 and fire holes 102 for communicating the central passage 101 with the outside. The fire holes 102 can be multiple, Figure 1 In the illustrated embodiment, the multiple fire holes 102 are divided into upper and lower two circles. The upper circle fire holes have a larger diameter than the lower circle fire holes. The upper circle fire holes are main fire holes, and the lower circle fire holes are stable flame holes. An air cavity 130 is formed between the upper cover body 120 and the lower cover body 110. The lower cover body 110 further has an air outlet passage 103, an air blowing passage 104, and an annular groove 105 for communicating the fire holes 102 with the outside. The annular groove 105 divides the fire holes 102 into first hole sections 1021 and second hole sections 1022. The central passage 101 communicates with the air cavity 130 through the air outlet passage 103. The air cavity 130 communicates with the annular groove 105 through the air blowing passage 104.

[0078] The central fire cover described above, when normally burning, a part of the gas directly burns out of the fire through the fire holes 102 from the central passage 101, and another part of the gas enters the air cavity 130 through the air outlet passage 103 and then flows into the annular groove 105 through the air blowing passage 104, thereby forming a stable flame ring at the bottom of the annular groove 105. The stable flame ring does not interfere with the gas in the fire holes 102 to affect the combustion performance, and can reduce the risk of off-flame. When food overflows or oil-water mixture splashes, the liquid does not directly flow into the inside of the central fire cover, but flows into the annular groove 105 to form a liquid film. At this time, the gas in the air cavity 130 is extruded above the annular groove 105 through the air blowing passage 104, thereby breaking the liquid film and allowing the gas to flow normally, thereby avoiding the problem of the fire holes 102 being blocked.

[0079] For reference, Figure 2 , Figure 4 and Figure 6 , the lower cover body 110 comprises an inner side wall 111, a top wall 112, and an outer side wall 113. The top wall 112 and the inner side wall 111 enclose the central passage 101. It should be noted that the "outer side wall 113" referred to here is relative to the central fire cover being arranged on the distributor. After the central fire cover is arranged on the distributor, the exposed surface wall is the outer side wall. After the central fire cover is arranged on the distributor, the central passage 101 serves as a gas passage. The inner side wall 111, the top wall 112, and the outer side wall 113 enclose the annular groove 105. The first hole sections 1021 are located on the inner side wall 111, and the second hole sections 1022 are located on the outer side wall 113. The air outlet passage 103 and the air blowing passage 104 are both arranged on the top wall 112. In this way, the lower cover body 110 can be integrally formed, which not only has a simple structure, but also facilitates the formation of the air outlet passage 103 and the air blowing passage 204.

[0080] For reference, Figure 5 and Figure 6As an exemplary embodiment, the gas outlet passage 103 comprises a plurality of gas outlet holes 1031, the centers of the plurality of gas outlet holes 1031 are located on the same circle D1, and the plurality of gas outlet holes 1031 are uniformly distributed. In this way, too much gas can be prevented from entering the gas cavity 130 through the gas outlet passage 103 during normal combustion, thereby affecting the combustion performance. It should be understood that the number and size of the gas outlet holes 1031 are not limited, as long as the purpose of connecting the central passage 101 and the gas cavity 130 is achieved. In an embodiment not shown, the gas outlet passage 103 can also be an annular groove. In this way, the purpose of connecting the central passage 101 and the gas cavity 130 is achieved, and the structure is simple and convenient to process.

[0081] Further, the gas blowing passage 104 comprises a plurality of gas inlet holes 1041, the centers of the plurality of gas inlet holes 1041 are located on the same circle D2, D2>D1, and the plurality of gas inlet holes 1041 are uniformly distributed. In this way, too much gas can be prevented from entering the gas blowing passage 104 through the gas cavity 130 during normal combustion, thereby affecting the combustion performance. It should be understood that the number and size of the gas inlet holes 1041 are not limited, as long as the purpose of connecting the gas cavity 130 and the annular groove 105 is achieved. In an embodiment not shown, the gas blowing passage 104 can also be an annular groove. In this way, the purpose of connecting the gas cavity 130 and the annular groove 105 is achieved, and the structure is simple and convenient to process.

[0082] Again referring to Figure 4 The thickness P of the outer side wall 113 is 0.5mm-3mm. For example, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc. In this way, the problem of easy breakage or deformation of the wall during processing of the fire hole 102 when the thickness is too small is avoided, and the problem of too short flame length when the flame in the annular groove 105 passes around the outer side wall 113 when the thickness is too large, thereby affecting the stable flame effect is avoided.

[0083] In order to facilitate the formation of the air cavity 130, the top wall 112 has a central hole 1121, an outer ring 1122 outside the blowing channel 103, and an inner ring 1123 between the central hole 1121 and the outer ring 1122. The upper cover body 120 has an insertion part 121, a top part 122, and a side part 123, the insertion part 121 is inserted into the central hole 1121 and is sealingly connected with the central hole 1121, for example, a threaded seal can be used, and a sealing ring or the like can also be used to achieve sealing connection, thereby on the one hand, the upper cover body 120 can be stably arranged on the lower cover body 110, on the other hand, the air tightness of the air cavity 130 can be ensured, so that the gas in the air cavity 130 can only enter and exit from the gas outlet channel 103 and the blowing channel 104. The side part 123 is arranged on the outer ring 1122, the top part 122 has a lower surface 1221, the inner ring 1123 has a top surface 11231, and the lower surface 1221 and the top surface 11231 have a gap t to form the air cavity 130. In this way, the upper cover body 120 can be stably arranged on the lower cover body 110, and the air cavity 130 can be formed with a simple structure.

[0084] Exemplarily, the gap t is 1mm-4mm. For example, 1mm, 2mm, 3mm, 4mm, etc., in this way, not only can the problem of too much gas accumulation due to too large gap affecting the combustion performance be avoided, but also the problem of too small extrusion force caused by too small gap and unable to break through the liquid film can be avoided.

[0085] Exemplarily, the width a of the annular groove is 1mm-3mm. For example, 1mm, 2mm, 3mm, etc., in this way, not only can the problem of insufficient secondary air intake and the gas being unable to form an effective stable flame ring be avoided, but also the problems of too long gas accumulation time and too large gas consumption can be avoided.

[0086] In this embodiment, the blowing channel 104 is parallel to the central axis of the center fire cover, that is, the included angle between the blowing channel 104 and the central axis of the center fire cover is 0°, and the central axis is vertical when the center fire cover is in use, and the blowing channel 104 is also vertical. In this way, the gas in the air cavity 130 generates extrusion above the annular groove 105 through the blowing channel 104, which is more likely to break through the liquid film.

[0087] It should be noted that in this embodiment, although the fire hole 102 includes two sections (i.e., the first hole section 1021 and the second hole section 1022); however, in an embodiment not shown, the fire hole 102 can only have the second hole section 1022, in which case the annular groove 105 divides the lower cover body 110 into an inner ring body and an outer ring body (as shown in the embodiment not shown). Figure 2The inner wall 111 can be considered as an inner ring, and the outer wall 113 can be considered as an outer ring. The burner hole 102 is only set on the outer ring. During normal combustion, the gas enters the gas chamber 130 through the gas outlet passage 103 and then branches through the blowing passage 104. Part of it is directly burned through the burner hole 102, and the other part flows into the annular groove 105, thereby forming a flame stabilizing ring at the bottom of the annular groove 105 to ensure combustion efficiency and reduce the risk of flame lift-off. Example 2

[0088] like Figure 7 As shown, this embodiment has a structure largely the same as the first embodiment. The flame hole 102, air outlet channel 103, air blowing channel 104, and annular groove 105 are all located on the lower cover 110, facilitating processing. The difference between this embodiment and the first embodiment is that the top wall 112 of the lower cover 110 has a central top surface 11201 and a stepped surface 11202. The upper cover 120 is a cover plate, with its outer edge supported by the stepped surface 11202 to cover the lower cover 110. The upper cover 120 has a lower cover surface 1201, with a gap between the lower cover surface 1201 and the central top surface 11201 to form an air cavity 130. The central top surface 11201 is a stepped surface; in embodiments not shown, the central top surface 11201 can also be a plane. Thus, not only can the upper cover 120 be securely placed on the lower cover 110, but the air cavity 130 can also be formed with a simple structure.

[0089] in addition, Figure 7 In the illustrated embodiment, the vent channel 103 is a through hole located at the center of the lower cover 110. It should be understood that, in embodiments not shown, the vent channel 103 may also include a plurality of vent holes 1031 as shown in the first embodiment, with the centers of the plurality of vent holes 1031 located on the same circumference D1, and the plurality of vent holes 1031 being evenly distributed. In embodiments not shown, the vent channel 103 may also be an annular through groove.

[0090] Other structures that are the same as those in the first embodiment will not be described in detail here. Example 3

[0091] like Figure 8 As shown, this embodiment has a structure substantially the same as the first embodiment. The difference between this embodiment and the first embodiment is that: the lower cover 110 has a lower sidewall 111', the upper cover 120 has an upper sidewall 123' surrounding the lower sidewall 111', the upper sidewall 123' has an inner sidewall 1231', the lower sidewall 111' has an outer sidewall 1111', and the air blowing channel 104 and the annular groove 105 are formed between the inner sidewall 1231' and the outer sidewall 1111'. In this way, the air blowing channel 104 and the annular groove 105 can be formed in a simple manner.

[0092] In this embodiment, the flame hole 102 includes a first hole section 1021 disposed on the lower sidewall 111' and a second hole section 1022 disposed on the upper sidewall 123'. Thus, both the upper cover 120 and the lower cover 110 have partial flame holes. During normal combustion, a portion of the combustion gas can directly ignite from the central channel 101 through the flame hole 102, while another portion enters the gas chamber 130 through the gas outlet channel 103 and then flows into the annular groove 105 through the blowing channel 104, thereby forming a flame-stabilizing ring at the bottom of the annular groove 105. This not only ensures combustion efficiency but also reduces the risk of flame lift-off.

[0093] In an embodiment not shown, the flame hole 102 may only have a second hole segment 1022 provided on the upper sidewall 123', that is, the flame hole 102 is provided on the upper sidewall 123'. In this way, the flame hole 102 is formed on the upper cover 120. During normal combustion, the gas enters the gas chamber 130 through the gas outlet passage 103 and then branches through the blowing passage 104. Part of it is directly burned through the flame hole 102, and the other part flows into the annular groove 105, thereby forming a flame stabilizing ring at the bottom of the annular groove 105 to ensure combustion efficiency and reduce the risk of flame lift-off.

[0094] Other structures that are the same as those in the first embodiment will not be described in detail here. Example 4

[0095] like Figure 9 and Figure 10 As shown, this embodiment has a structure that is substantially the same as the first embodiment. The main difference between this embodiment and the first embodiment is that the blowing channel 104 is inclined downward and outward from the blowing inlet 1043 to the blowing outlet 1042, so that it has an angle α with the central axis of the central flame cap. In this embodiment, the angle α is 25°. In embodiments not shown, the angle α can also be 5°, 15°, 35°, 45°, etc. That is to say, the angle α is between 0° and 45°. Since the central axis of the central flame cap is vertical when in use, the blowing channel 104 is set in this way, so that when the gas in the gas chamber 130 is squeezed above the annular groove 105 through the blowing channel 104, it is easier to break through the liquid film.

[0096] In addition, in this embodiment, in order to form an air cavity 130 after the upper cover 120 is placed on the lower cover 110, a locking groove 114 may be provided on the lower cover 110, the upper cover 120 may be sheet-like, and the upper cover 120 has a cap edge portion 124 that can be squeezed and deformed to be locked into the locking groove 114.

[0097] In this embodiment, the annular groove 105 is also inclined relative to the central axis of the central flame cap, and has the same inclination angle as the air blowing channel 104. The air outlet channel 103 is a through hole located at the center of the lower cover 110.

[0098] Also, in the present embodiment, the fire holes are also in the upper and lower ring structure, but the upper and lower ring fire holes have different structures, for example Figure 10 As shown, the fire hole 102 includes two segments (i.e., a first hole segment 1021 and a second hole segment 1022), and the lower ring fire hole 102' only has one segment.

[0099] Other structures same as the first embodiment are not described here.

[0100] According to another aspect of the present application, there is also provided a burner having any of the center fire caps as described above. In addition to this, the burner also includes a venturi, a burner tip, and the like. The venturi, the burner tip, and the like can have various structures that are available now or that can be available in the future, which do not constitute a limitation to the protection scope of the present application.

[0101] In the description of the present application, it is to be understood that the orientation words such as "upper", "lower", and "top" and the like indicated orientation or position relationship is generally based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and in the absence of contrary description, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation to the protection scope of the present application; the orientation words "inner" and "outer" refer to the inner and outer relative to the contour of each component itself.

[0102] For the convenience of description, spatial relative terms such as "above", "upper", "on", "top", and the like can be used herein to describe the spatial relationship of one or more components or features shown in the drawings with other components or features. It should be understood that the spatial relative terms not only include the orientation of the components as described in the drawings, but also include different orientations in use or operation. For example, if the components in the drawings are inverted as a whole, the components "above" or "on" other components or features will include the case of "below" or "under" other components or features. Thus, the exemplary term "above" can include both "above" and "below" orientations. In addition, these components or features can also be positioned at other different angles (for example, rotated by 90 degrees or other angles), and all these cases are intended to be included herein.

[0103] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting, as the scope of the exemplary embodiments of this application is limited only by the appended claims. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, components, elements, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, components, elements, and / or groups thereof.

[0104] It should be noted that the terms "first", "second", and the like, herein do not necessarily have an either chronological or spatial relation to each other, but are used to distinguish a certain element from another, unless specifically stated otherwise. It should be understood that the use of the term "and / or" includes any and all combinations of one or more of the associated listed items. It should be understood that the use of the terms "includes", "including", "comprising", "comprises" or "comprising" does not exclude the presence of other elements or steps than those listed.

[0105] The application has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of illustration and description, and are not intended to limit the application to the scope of the described embodiments. Furthermore, those skilled in the art can understand that the application is not limited to the above embodiments, and more various modifications and changes can be made according to the teachings of the application, and these modifications and changes all fall within the scope of the application claimed. The scope of protection of the application is defined by the appended claims and their equivalents.

Claims

1. A center burner cap having a central passage and a burner hole communicating with said central passage, said burner hole being divided into upper and lower rings, characterized in that, Further comprising an air cavity, an air outlet channel, an air blowing channel and an annular groove connecting the fire hole and the outside; The center fire cover comprises a lower cover body and an upper cover body arranged above the lower cover body, the air cavity is formed between the upper cover body and the lower cover body, the center channel is arranged on the lower cover body and communicated with the air cavity through the air outlet channel, the air cavity is communicated with the annular groove through the air blowing channel, the fire hole, the air outlet channel and the air blowing channel are arranged on the lower cover body, and the annular groove extends upward from the lower end surface of the lower cover body to be communicated with the fire hole, and the annular groove divides the fire hole into a first hole section and a second hole section.

2. The center burner cap of claim 1, wherein The width of the annular groove is 1mm-3mm.

3. The center burner cap of claim 1, wherein The air cavity has a depth t, and the depth t is 1mm-4mm.

4. The center burner cap of claim 1, wherein, The center fire cover has a central axis, and the air blowing channel and the central axis have an included angle of 0°-45°.

5. The center burner cap of claim 1, wherein, The lower cover body comprises an inner side wall, a top wall and an outer side wall, the top wall and the inner side wall enclose the center channel, the inner side wall, the top wall and the outer side wall enclose the annular groove, the first hole section is located on the inner side wall, the second hole section is located on the outer side wall, and the air outlet channel and the air blowing channel are arranged on the top wall.

6. The center pilot flame guard of claim 5 wherein, The top wall has a center hole, an outer ring outside the air blowing channel and an inner ring between the center hole and the outer ring; the upper cover body has an insertion part, a top part and a side part, the insertion part is inserted into the center hole, the side part is arranged on the outer ring, the top part has a lower surface, the inner ring has a top surface, and the lower surface and the top surface have a gap to form the air cavity.

7. The center pilot flame guard of claim 5 wherein, The air outlet channel comprises a plurality of air outlet holes, the centers of the plurality of air outlet holes are located on the same circle D1, and the plurality of air outlet holes are uniformly distributed; the air blowing channel comprises a plurality of air inlet holes, the centers of the plurality of air inlet holes are located on the same circle D2, D2>D1, and the plurality of air inlet holes are uniformly distributed.

8. The center burner cap of claim 5, wherein, The air outlet channel is a through hole located at the center of the lower cover body; the air blowing channel comprises a plurality of air inlet holes, the centers of the plurality of air inlet holes are located on the same circle D2, and the plurality of air inlet holes are uniformly distributed, or the air blowing channel is an annular through groove.

9. The center burner cap of claim 5 wherein, The air outlet channel is an annular through groove; the air blowing channel is an annular through groove.

10. The center burner cap of claim 6, wherein, The insertion part and the center hole are connected by threads and / or a sealing ring.

11. A center burner cap having a central passage and a burner orifice in communication with said central passage, said burner orifice being divided into upper and lower rings, characterized by, Further comprising an air cavity, an air outlet channel, an air blowing channel and an annular groove connecting the fire hole and the outside; The center fire cap comprises a lower cap body and an upper cap body arranged above the lower cap body, the air cavity is formed between the upper cap body and the lower cap body, the center passage is arranged on the lower cap body and communicates with the air cavity through the air outlet passage, the air cavity communicates with the annular groove through the air blowing passage, the lower cap body has a lower side wall, the upper cap body has an upper side wall arranged outside the lower side wall, the upper side wall has an inner side surface, the lower side wall has an outer side surface, the air blowing passage and the annular groove are formed between the inner side surface and the outer side surface, and the fire hole comprises a first hole section arranged on the lower side wall and a second hole section arranged on the upper side wall.

12. The center burner cap of claim 11, wherein, The width of the annular groove is 1mm-3mm.

13. The center burner cap of claim 11, wherein, The air cavity has a depth t, and the depth t is 1mm-4mm.

14. The center burner cap of claim 11, wherein, The center fire cap has a central axis, and the air blowing passage and the central axis have an included angle of 0°-45°.

15. A burner characterized by, The center fire cap comprises a lower cap body and an upper cap body arranged above the lower cap body, the air cavity is formed between the upper cap body and the lower cap body, the center passage is arranged on the lower cap body and communicates with the air cavity through the air outlet passage, the air cavity communicates with the annular groove through the air blowing passage, the lower cap body has a lower side wall, the upper cap body has an upper side wall arranged outside the lower side wall, the upper side wall has an inner side surface, the lower side wall has an outer side surface, the air blowing passage and the annular groove are formed between the inner side surface and the outer side surface, and the fire hole comprises a first hole section arranged on the lower side wall and a second hole section arranged on the upper side wall.

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