Combined fire cover, combustor and gas stove

Abstract

The utility model belongs to the technical field of combustion, and discloses a combined fire cover, a combustor and a gas stove. The combined fire cover comprises an upper fire cover body and a lower fire cover body which are vertically spliced, flame holes and a gas mixing cavity with a lower opening are defined by the upper fire cover body and the lower fire cover body, the flame holes are located in the outer side of the gas mixing cavity, and the multiple flame holes are formed in the circumferential direction of the gas mixing cavity at intervals. The inner ends of the flame holes penetrate through the outer ring cavity wall of the gas mixing cavity, the outer ends of the flame holes penetrate through the outer side wall of the combined fire cover, and the portions, between the two ends, of the flame holes are locally widened to form flow expanding sections. The combustor comprises the combined fire cover. According to the combined fire cover, the combustor and the gas stove, the combustion stability can be improved, the combustion performance can be improved, and the machining cost of the combined fire cover and the machining cost of the combustor can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of combustion technology, and in particular to a combined burner cap, burner and gas stove. Background Technology

[0002] The burner is a device used to ignite and burn gas. It is the core component of a gas stove, and the combustion performance of the burner directly affects the performance of the gas stove.

[0003] Existing burners typically include a furnace head, a flame distributor, and a burner cap arranged sequentially from bottom to top. The burner cap usually consists of an inner ring burner cap and an outer ring burner cap spaced apart from the inner ring burner cap. The inner ring burner cap has multiple inner ring flame holes spaced apart circumferentially, and the outer ring burner cap has multiple outer ring flame holes spaced apart circumferentially. Both the inner and outer ring burner caps are located on the flame distributor, and the mixed gas is supplied to the inner and outer ring flame holes through the inner and outer ring gas distribution chambers on the flame distributor, respectively.

[0004] In existing burners, the flame holes on the burner cap are usually round and straight to reduce the difficulty of manufacturing the flame holes. However, the design of round and straight flame holes can easily cause flame lift-off when the gas flow rate is high, resulting in poor flame stability and even incomplete combustion. At the same time, when the supply pressure of the mixed gas is low, backfire is also likely to occur, affecting the safe use of the burner and even causing safety hazards due to backfire. Utility Model Content

[0005] The purpose of this invention is to provide a flame cap that can reduce the probability of flame lift-off and backfire during combustion, thereby improving combustion stability and safety.

[0006] Another objective of this invention is to provide a burner that can effectively reduce the probability of flame lift-off and flashback, thereby improving combustion stability and safety.

[0007] Another objective of this utility model is to provide a gas stove that can improve the combustion stability and safety of the gas stove.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] A combined flame cap includes an upper flame cap and a lower flame cap that are joined together. The upper flame cap and the lower flame cap together form a mixing chamber with a flame hole and a lower open end. The flame hole is located outside the mixing chamber and is arranged in multiple circumferentially along the mixing chamber. The inner end of the flame hole penetrates the outer ring wall of the mixing chamber, and the outer end of the flame hole penetrates the outer wall of the combined flame cap. The flame hole is locally widened between its two ends to form a flow-expanding section.

[0010] As an optional technical solution for the combined flame cap, the lower end of the upper flame cap and the upper end of the lower flame cap each have a splicing surface, and the two splicing surfaces are fitted together.

[0011] At least one splicing surface is provided with a flame groove, which extends to the inner and outer sides of the splicing surface and is provided in multiple ways at intervals along the circumference of the splicing surface. The groove wall of the flame groove and the groove wall of the flame groove on another splicing surface or on another splicing surface are arranged to form the flame hole.

[0012] As an optional technical solution for the combined flame cap, the flame groove includes a main groove extending in a straight direction, the groove wall of the main groove is partially expanded outward to form a widened groove, and the flame hole forms a flow-expanding section at the widened groove.

[0013] And / or, the flame grooves are provided on the two splicing surfaces in a one-to-one correspondence, and the flame grooves on the two splicing surfaces are symmetrically arranged relative to the overlapping surfaces of the upper and lower splicing surfaces.

[0014] As an optional technical solution for the combined flame cap, the widened groove is arranged around the main groove.

[0015] As an optional technical solution for the combined flame cap, the length of the main groove along the circumferential direction of the splicing surface is L1, and the length of the flow expansion section along the circumferential direction of the splicing surface is L2, where L2 = 1.5L1 to 3L1.

[0016] As an optional technical solution for the combined flame cap, the combined flame cap is provided with multiple flame hole groups at intervals along the circumference. Each flame hole group includes multiple flame holes evenly spaced along the circumference of the combined flame cap. In the same flame hole group, the distance between the diffuser sections of two adjacent flame holes is L3, where 0.5mm≤L3≤3mm.

[0017] As an optional technical solution for the combined flame cap, at least two of the flow-expanding sections are provided at intervals along the extension direction of the flame holes;

[0018] And / or, the combined flame cap is an outer ring flame cap, the upper flame cap has an annular structure and the upper flame cap has an annular groove with the opening facing downwards, the lower flame cap is located outside the annular groove, and the inner sidewall of the lower flame cap and the groove wall of the annular groove together form the gas mixing chamber.

[0019] A burner comprising the combined burner cap as described above.

[0020] As an optional technical solution for the burner, it also includes a lifting drive component, which is connected to the upper burner cap. The lifting drive component drives the upper burner cap to move vertically up and down, so that a flame stabilizing groove is formed between the upper burner cap and the lower burner cap. The flame stabilizing groove is connected to the mixing chamber, and the lifting drive component can adjust the width of the flame stabilizing groove.

[0021] A gas stove, including a burner as described above.

[0022] The beneficial effects of this utility model are:

[0023] The combined flame cap provided by this utility model, because the upper and lower flame caps together form a flame hole, allows the flame hole to be machined on the corresponding splicing surfaces of the upper and / or lower flame caps, reducing the machining difficulty and cost of the flame hole. Simultaneously, because each flame hole is locally widened at both ends to form a flow-expanding section, this section increases the contact area between the mixed gas and the inner wall of the flame hole, thereby increasing the residence time of the premixed gas flow through the flow-expanding section, increasing the Dumcolé number of the combustion reaction, reducing incomplete combustion products, and thus reducing pollutants generated during combustion. Furthermore, the presence of the flow-expanding section causes the flow velocity of the mixed gas to decrease at the junction of the flow-expanding section and the main orifice of the flame hole due to the shearing effect of the flow-expanding section wall. This results in a relatively high velocity of the mixed gas flow in the unexpanded region of the flame orifice, and a relatively low velocity in the expanded region, creating a velocity gradient field. According to Bernoulli's principle, this generates a secondary flow phenomenon perpendicular to the flow direction, thereby promoting the mixing between the fuel gas and air, improving the premixing uniformity of the gas flowing out of the flame orifice, and thus improving combustion completeness and stability. Furthermore, when the velocity of the mixed gas is high, boundary layer separation occurs in the gas flow within the expansion section, resulting in stable vortices that enhance the anchoring effect on the flame, providing ignition for combustion, preventing flame lift-off due to excessively high gas flow velocity, and reducing the probability of backfire due to insufficient gas supply pressure, further enhancing combustion stability.

[0024] The burner provided by this utility model, by adopting the above-mentioned combined flame cap, can improve combustion stability and safety, reduce pollutants generated during combustion, and reduce the processing cost of the burner.

[0025] The gas stove provided by this utility model, by adopting the above-mentioned burner, can improve the combustion stability and reliability of the gas stove, thereby enhancing the performance of the gas stove. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the burner provided in Embodiment 1 of this utility model;

[0027] Figure 2This is a schematic diagram of the disassembled structure of the burner provided in Embodiment 1 of this utility model;

[0028] Figure 3 This is a cross-sectional view of the burner provided in Embodiment 1 of this utility model;

[0029] Figure 4 yes Figure 3 A magnified view of a section at point I;

[0030] Figure 5 This is a schematic diagram of the combined flame cap provided in Embodiment 1 of this utility model;

[0031] Figure 6 This is a schematic diagram of the structure of the upper heating cap provided in Embodiment 1 of this utility model;

[0032] Figure 7 yes Figure 6 A magnified view of a section at point J;

[0033] Figure 8 This is a schematic diagram of the structure of the lower fire cover provided in Embodiment 1 of this utility model;

[0034] Figure 9 This is a cross-sectional view of the burner provided in Embodiment 2 of this utility model;

[0035] Figure 10 yes Figure 9 A magnified view of the area at point K.

[0036] In the picture:

[0037] 100. Combination burner cap; 200. Gas distributor seat; 201. Inner ring premixing chamber; 202. Outer ring premixing chamber; 203. Inner wall; 204. Outer wall; 300. Inner ring burner cap; 301. Inner ring burner hole; 302. Cavity; 400. Lifting drive component; 500. Temperature detection component;

[0038] 1. Sub-flame cap; 1a. Upper flame cap; 1a1. Upper main body; 1a2. Inner positioning ring; 1a3. Annular groove; 1b. Lower flame cap; 1b1. Lower main body; 1b2. Outer positioning ring; 11. Joint surface; 11a. Upper joint surface; 11b. Lower joint surface; 12. Flame groove; 121. Main groove; 122. Widened groove;

[0039] 2. Flame hole; 21. Main hole section; 22. Flow diffuser section; 3. Mixing chamber; 4. Flame stabilizer groove. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0041] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0044] Example 1

[0045] This embodiment provides a burner that can be applied to a gas stove to ignite and burn gas, thereby heating the cooking appliances, while improving combustion stability and reducing the probability of flame lift-off or backfire.

[0046] like Figures 1 to 3As shown, specifically, the burner includes a burner head (not shown), a gas distribution seat 200, and a burner cap assembly arranged sequentially from bottom to top. The upper end of the gas distribution seat 200 has an inner ring mixing chamber 3 and an outer ring premixing chamber 202 spaced around the inner ring premixing chamber 201. The burner head is equipped with nozzles for supplying gas to the inner and outer ring premixing chambers 201 and 202. The burner cap assembly includes an inner ring burner cap 300 and an outer ring burner cap spaced around the outer side of the inner ring burner cap 300. The inner ring burner cap 300 has a cavity 302 with a lower opening, and an inner ring flame hole 301 is arranged circumferentially on the inner ring burner cap. The outer ring burner cap has an outer ring flame hole arranged circumferentially, which communicates with the outer ring premixing chamber 202. The inner ring flame hole 301 communicates with the inner ring premixing chamber 201 through the cavity 302.

[0047] In this embodiment, the inner ring flame cap 300 and / or the outer ring flame cap is a combined flame cap 100. The combined flame cap 100 includes two sub-flame caps 1 connected vertically. The two sub-flame caps 1 together form a flame hole 2 and a lower open mixing chamber 3. The flame holes 2 are located outside the mixing chamber 3 and are arranged in multiple circumferentially along the mixing chamber 3. The inner end of each flame hole 2 penetrates the outer ring wall of the mixing chamber 3, and the outer end penetrates the outer wall of the combined flame cap 100. Each flame hole 2 is locally widened between its two ends to form a flow-expanding section 22. The sub-flame cap 1 located on the upper side is the upper flame cap 1a, and the sub-flame cap 1 located on the lower side is the lower flame cap 1b.

[0048] The combined flame cap 100 provided by this utility model, since the upper flame cap 1a and the lower flame cap 1b together form a flame hole 2, allows the flame hole 2 to be processed on the corresponding splicing surface 11 of the upper flame cap 1a and / or the lower flame cap 1b, which reduces the processing difficulty and cost of the flame hole 2. At the same time, since each flame hole 2 is locally widened between its two ends to form a flow-expanding section 22, the flow-expanding section 22 can increase the contact area between the mixed gas and the inner wall of the flame hole 2, thereby increasing the residence time of the premixed gas flow when flowing through the flow-expanding section 22, increasing the Damcole number of the combustion reaction, reducing incomplete combustion products, and thus reducing the pollutants generated by combustion. Furthermore, the presence of the flow-expanding section 22 causes the mixed gas to be affected by the flow-expanding section 22 when flowing through the junction of the flow-expanding section 22 and the main hole portion 21 of the flame hole 2. 2. The wall shearing effect reduces the flow velocity, resulting in a relatively high flow velocity in the unwidened region of the flame orifice 2 and a relatively low flow velocity in the widened region, creating a velocity gradient field. According to Bernoulli's principle, this generates a secondary flow phenomenon perpendicular to the flow direction, promoting the mixing of fuel gas and air, improving the premixing uniformity of the gas exiting the flame orifice 2, and thus improving combustion completeness and stability. Furthermore, when the flow velocity of the gas mixture is high, boundary layer separation occurs in the flow expansion section 22, resulting in stable vortices within the expansion section 22. This enhances the anchoring effect on the flame, provides ignition for combustion, avoids flame lift-off due to excessively high gas mixture velocity, and also reduces the probability of backfire due to insufficient gas supply pressure, further enhancing combustion stability.

[0049] Because the inner ring flame cap 300 is relatively small in size and relatively easy to manufacture, and because the parameter design of the outer ring flame holes on the outer ring flame cap has a greater impact on the burner's combustion performance than the inner ring flame holes 301, in this embodiment, the outer ring flame cap is a combined flame cap 100, meaning the flame hole 2 is an outer ring flame hole, and the inner ring flame cap 300 is an integrated flame cap. This reduces the overall cost of the flame cap assembly and effectively improves the overall performance of the burner. In other embodiments, both the inner ring flame cap 300 and the outer ring flame cap can be combined flame caps 100.

[0050] In this embodiment, the structural configuration of the combined flame cap 100 is described using the outer ring flame cap as an example. However, it is understood that when the combined flame cap 100 is the inner ring flame cap 300, the structural configuration of the combined flame cap 100 can refer to the configuration in this embodiment, and will not be described again in this embodiment.

[0051] It is worth noting that the structure of the gas distribution seat 200 can be set with reference to existing technology, and this embodiment does not limit or elaborate on it.

[0052] like Figures 3 to 8As shown, in this embodiment, since the combined flame cap 100 is an outer ring flame cap, the upper flame cap 1a has an annular structure and an annular groove 1a3 with a lower opening. The lower end face of the outer ring wall of the upper flame cap 1a forms an upper splicing surface 11a. The lower flame cap 1b is located outside the annular groove 1a3, and the lower flame cap 1b and the groove wall of the annular groove 1a3 enclose the gas mixing chamber 3.

[0053] In other embodiments, the combined flame cap 100 is an inner ring flame cap 300, that is, the upper flame cap 1a includes a top plate and a surrounding wall arranged around the outer periphery of the top plate, the lower end face of the surrounding wall forms an upper splicing surface 11a, and the lower flame cap 1b, the surrounding wall and the top plate together form a gas mixing chamber 3.

[0054] The gas distribution seat 200 has an inner wall 203 and an outer wall 204 that surround and form an outer ring premixing chamber 202. The inner end of the upper burner cap 1a is supported on the inner wall 203, and the lower burner cap 1b is supported on the outer wall 204. The upper burner cap 1a and the lower burner cap 1b are detachably connected to ensure the stability and reliability of the combined burner cap 100 on the gas distribution seat 200.

[0055] Furthermore, the upper flame cover 1a includes an annular upper main body 1a1, the cross-section of which is a downward-opening V-shaped structure or a U-shaped structure. An inner positioning ring 1a2 extends downward from the inner end of the upper main body 1a1. The inner positioning ring 1a2 is fitted onto the outer side of the inner wall 203, and the upper end of the inner wall 203 abuts against the upper main body 1a1 to achieve axial and radial installation positioning. The lower flame cover 1b includes a lower main body 1b1, the upper end of which has a lower splicing surface 11b. An outer positioning ring 1b2 extends downward from the lower end of the lower main body 1b1, the outer positioning ring 1b2 is fitted onto the inner side of the outer wall 204, and the upper end of the outer wall 204 abuts against the lower main body 1b1 to achieve axial and radial installation positioning.

[0056] Specifically, the lower end of the upper burner cap 1a and the upper end of the lower burner cap 1b each have a splicing surface 11, which are arranged in a ring shape and are fitted together. The splicing surface 11 located at the upper end of the lower burner cap 1b is the lower splicing surface 11b, and the splicing surface 11 located at the lower end of the upper burner cap 1a is the upper splicing surface 11a. Both the upper splicing surface 11a and the lower splicing surface 11b are located on the outer side of the mixing chamber 3.

[0057] In this embodiment, both the upper splicing surface 11a and the lower splicing surface 11b are provided with flame grooves 12. Multiple flame grooves 12 are spaced apart circumferentially along the splicing surface 11 and extend to the inner and outer sides of the corresponding splicing surface 11. The flame grooves 12 on the two splicing surfaces 11 correspond one-to-one, and the groove walls of the flame grooves 12 on the upper splicing surface 11a and the lower splicing surface 11b together form a flame hole 2. This allows for the reduction of the groove depth of a single flame groove 12 while ensuring the processing dimensions of the flame hole 2, thus better guaranteeing the structural strength and rigidity of the corresponding upper flame cap 1a and lower flame cap 1b.

[0058] In other embodiments, one of the two splicing surfaces 11 may have a flame groove 12, and the groove wall of the flame groove 12 and the other of the two splicing surfaces 11 may together form a flame hole 2.

[0059] The flame hole 2 extends upward at an inward angle from the inside to the outside, ensuring that the mixed gas flowing out of the flame hole 2 has an upward flow tendency, thereby causing the flame generated by combustion to rise upward. Therefore, both splicing surfaces 11 are set upward at an inward angle from the inside to the outside, so that the inclination direction of the splicing surface 11 is the extension direction of the flame hole 2.

[0060] Furthermore, the flame grooves 12 on the two splicing surfaces 11 are symmetrically arranged relative to the overlapping surfaces of the two splicing surfaces 11, so that the flame grooves 12 on the two splicing surfaces 11 have the same shape, which is more conducive to controlling the shape accuracy of the flame hole 2 formed by splicing and reducing the processing difficulty of the combined flame cap 100.

[0061] The flame groove 12 includes a main groove portion 121 extending radially to both the inner and outer sides of the splicing surface 11. The main groove portion 121 is partially widened to form a widened groove portion 122. The flame hole 2 forms a main flame hole at the main groove portion 121 and a flow-expanding section 22 at the widened groove portion 122. That is, the cross-sectional shape of the main groove portion 121 is consistent along the extension direction. Specifically, in this embodiment, the main groove portion 121 surrounds to form the main hole portion 21 of the flame hole 2, and the two widened groove portions 122 facing each other vertically surround to form the flow-expanding section 22.

[0062] In this embodiment, the widening groove 122 is arranged around the main groove 121 to increase the cross-sectional area of ​​the flow-expanding section 22 while keeping the cross-sectional area and width of the main hole 21 unchanged. This improves the uniformity of the airflow in the circumferential direction of the flame hole 2 when the mixed airflow flows through the flow-expanding section 22. In other embodiments, the widening groove 122 may be arranged on one side of the main groove 121, or multiple widening grooves 122 may be arranged at intervals along the circumference of the main groove 121.

[0063] In this embodiment, the main groove 121 is a semi-cylindrical groove to reduce the processing difficulty, and the main hole 21 formed by the main groove 121 is a cylindrical hole to reduce the processing difficulty of the flame groove 12 while ensuring the smooth flow of the mixed gas through the main groove 121. In other embodiments, the cross-section of the main groove 121 can also be elliptical, rectangular, or other shapes. This utility model does not impose specific limitations on the shape of the main groove 121.

[0064] In this embodiment, the widened groove 122 is a semi-circular annular groove coaxial with the main groove 121, that is, the flow-expanding section 22 is a cylindrical section coaxial with the main hole 21. This makes the shapes of the widened groove 122 and the main groove 121 compatible, thereby reducing the difficulty of opening the flame groove 12 and thus reducing the processing difficulty of the upper flame cap 1a and the lower flame cap 1b.

[0065] Furthermore, the length of the main groove 121 along the splicing surface 11 is L1, and the length of the expansion section 22 along the splicing surface 11 is L2, where L2 = 1.5L1 to 3L1. This can better ensure the local widening effect of the flame hole 2, appropriately increase the residence time of the airflow when it flows through the expansion section 22, avoid the need to increase the spacing between two adjacent flame holes 2 due to the expansion section 22 being too wide, and avoid the backfire problem caused by the expansion section 22 being too wide.

[0066] The combined flame cap 100 is provided with multiple flame hole groups at intervals along the circumference. Each flame hole group includes multiple flame holes 2 at intervals along the circumference of the combined flame cap 100. In the same flame hole group, the distance between the diffuser sections 22 of two adjacent flame holes 2 in the circumference of the combined flame cap 100 is L3, 0.2mm≤L3≤2mm, so as to ensure the local structural strength between the two flame holes 2 and the overall structural strength of the combined flame cap 100.

[0067] Furthermore, in the same group of flame holes, the distance between the center lines of two adjacent flame holes 2 is d, where d = 2L1 ~ 3L1.

[0068] In this embodiment, one diffuser section 22 is provided along the extension direction of the flame hole 2 to simplify the processing of the flame hole 2. In other embodiments, at least two diffuser sections 22 are provided at intervals along the extension direction of the flame hole 2 to further enhance combustion stability.

[0069] Other structures of the burner can be designed with reference to existing technologies, which is not the focus of this utility model and will not be described in detail here.

[0070] This embodiment also provides a gas stove, including the burner described above. The gas stove provided in this embodiment, by employing the aforementioned burner, can improve the combustion stability and reliability of the gas stove, thereby enhancing its performance.

[0071] Example 2

[0072] This embodiment provides a burner, and the burner provided in this embodiment is a further improvement based on the burner in Embodiment 1. This embodiment will not repeat the contents that are the same as in Embodiment 1.

[0073] like Figure 9 and Figure 10 As shown, in this embodiment, the burner also includes a lifting drive 400, which is connected to the upper burner cap 1a. The lifting drive 400 drives the upper burner cap 1a to move vertically up and down, so that a flame stabilizing groove 4 is formed between the upper burner cap 1a and the lower burner cap 1b. The flame stabilizing groove 4 is connected to the mixing chamber 3, and the lifting drive 400 can adjust the width of the flame stabilizing groove 4.

[0074] That is, the combined flame cap 100 has a spliced ​​state and a flame-stabilized state. When the combined flame cap 100 is in the spliced ​​state, the upper splicing surface 11a of the upper flame cap 1a and the lower splicing surface 11b of the lower flame cap 1b are fitted together, and the flame grooves 12 on the two splicing surfaces 11 form a flame hole 2. When the combined flame cap 100 is in the flame-stabilized state, the upper splicing surface 11a and the lower splicing surface 11b are spaced apart, so that a flame-stabilizing groove 4 is formed between the upper splicing surface 11a and the lower splicing surface 11b, so as to increase the speed at which the mixed gas flows out of the combined flame cap 100 and achieve the function of flame stabilization.

[0075] That is, the burner provided in this embodiment drives the upper flame cap 1a to move vertically relative to the lower flame cap 1b by setting a lifting drive component 400, so that the combined flame cap 100 can switch between combined state and stable flame state. This allows the distance between the upper flame cap 1a and the lower flame cap 1b to be adjusted according to the combustion stage and firepower requirements, improving the convenience of firepower adjustment. At the same time, it can further improve the stability of combustion, better meet the combustion requirements under various working conditions, and improve the user experience of the flame cap assembly and the burner.

[0076] Furthermore, the burner also includes a temperature detection element 500, which is used to detect the temperature of the combined burner cap 100 or the flame. The gas stove includes a controller, and both the temperature detection element 500 and the lifting drive element 400 are communicatively connected to the controller. The controller controls the operation of the lifting drive element 400 based on the temperature detected by the temperature detection element 500. The temperature detection element 500 may, but is not limited to, be installed on the lower burner cap 1b or the gas distributor 200 to detect the temperature at the lower burner cap 1b.

[0077] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A combined flame cap, characterized in that, It includes an upper flame cap (1a) and a lower flame cap (1b) that are spliced ​​together. The upper flame cap (1a) and the lower flame cap (1b) together form a flame hole (2) and a lower open mixing chamber (3). The flame hole (2) is located outside the mixing chamber (3) and is arranged in multiple circumferentially along the mixing chamber (3). The inner end of the flame hole (2) penetrates the outer ring wall of the mixing chamber (3), and the outer end of the flame hole (2) penetrates the outer wall of the combined flame cap. The flame hole (2) is partially widened between its two ends to form a flow-expanding section (22).

2. The combined flame cap according to claim 1, characterized in that, The lower end of the upper flame cap (1a) and the upper end of the lower flame cap (1b) each have a splicing surface (11), and the two splicing surfaces (11) are fitted together. At least one of the splicing surfaces (11) is provided with a flame groove (12). The flame groove (12) extends to the inner and outer sides of the splicing surface (11) and is provided in multiple ways at intervals along the circumference of the splicing surface (11). The groove wall of the flame groove (12) and the groove wall of the flame groove (12) on another splicing surface (11) or the other splicing surface (11) together form the flame hole (2).

3. The combined flame cap according to claim 2, characterized in that, The flame slot (12) includes a main slot (121) extending in a straight direction. The main slot (121) has a partially expanded slot (122) formed by the outward expansion of the slot wall. The flame hole (2) forms the flow-expanding section (22) at the expanded slot (122). And / or, the flame grooves (12) are provided on the two splicing surfaces (11) in a one-to-one correspondence, and the flame grooves (12) on the two splicing surfaces (11) are symmetrically arranged relative to the overlapping surfaces of the upper and lower splicing surfaces (11).

4. The combined flame cap according to claim 3, characterized in that, The widened groove (122) is arranged around the main groove (121).

5. The combined flame cap according to claim 3, characterized in that, The length of the main channel (121) along the splicing surface (11) is L1, and the length of the expansion section (22) along the splicing surface (11) is L2, where L2 = 1.5L1 ~ 3L1.

6. The combined flame cap according to claim 5, characterized in that, The combined flame cap is provided with multiple flame hole groups at intervals along the circumference. Each flame hole group includes multiple flame holes (2) evenly spaced along the circumference of the combined flame cap. In the same flame hole group, the distance between the diffuser section (22) of two adjacent flame holes (2) is L3, 0.2mm≤L3≤2mm.

7. The combined flame cap according to any one of claims 1-6, characterized in that, The diffuser section (22) is provided at least two at intervals along the extension direction of the flame hole (2); And / or, the combined flame cap is an outer ring flame cap, the upper flame cap (1a) has an annular structure, and the upper flame cap (1a) has an annular groove (1a3) with the opening facing downward, the lower flame cap (1b) is located outside the annular groove (1a3), and the inner sidewall of the lower flame cap (1b) and the groove wall of the annular groove (1a3) together form the gas mixing chamber (3).

8. A burner, characterized in that, Includes the combined flame cap as described in any one of claims 1-7.

9. The burner according to claim 8, characterized in that, The burner also includes a lifting drive (400), which is connected to the upper burner cap (1a). The lifting drive (400) drives the upper burner cap (1a) to move vertically up and down so that a flame stabilizing groove (4) is formed between the upper burner cap (1a) and the lower burner cap (1b). The flame stabilizing groove (4) is connected to the mixing chamber (3), and the lifting drive (400) can adjust the width of the flame stabilizing groove (4).

10. A gas stove, characterized in that, Includes the burner as described in claim 8 or 9.

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