Heat shield and gas stove

Abstract

The heat insulation cover is suitable for the gas stove, the gas stove comprises a combustor, a combustion cavity used for containing the combustor is formed in the middle of the heat insulation cover, the heat insulation cover comprises an upper cover shell, a plurality of top rotational flow pieces and a lower cover shell, and the upper cover shell is provided with a flow guide face used for being arranged towards the bottom of a cooker; the multiple top rotational flow pieces are arranged on the flow guide face in a protruding mode at intervals, a top rotational flow channel is formed between every two adjacent top rotational flow pieces and the flow guide face, so that the flow direction of smoke flowing through the top rotational flow channels surrounds the axial direction of the combustion cavity, and a heat insulation cavity is defined by the lower housing and the upper housing. The contact time between the smoke and the cooker is prolonged, the smoke heat absorption of the cooker is improved, and the overall heat efficiency of the gas stove is improved.

Description

Technical Field

[0001] This application relates to the field of kitchenware technology, and more specifically, to a heat insulation cover and a gas stove. Background Technology

[0002] A gas stove is a common kitchen appliance that uses the combustion of gas (such as natural gas, liquefied petroleum gas, etc.) to generate heat for cooking.

[0003] Gas stoves typically consist of a heat shield and a burner. The heat shield is located around the burner and is used to support the cooking utensils. The burner is used to heat the cooking utensils.

[0004] However, in related technologies, the limited heat exchange time between high-temperature flue gas and cooking utensils results in low thermal efficiency of gas stoves. Summary of the Invention

[0005] This application provides a heat insulation cover and a gas stove, which are designed to improve the combustion efficiency of the gas stove.

[0006] This application provides a heat insulation cover suitable for a gas stove, the gas stove including a burner, and the heat insulation cover having a combustion chamber for housing the burner in its middle portion, the heat insulation cover comprising:

[0007] The upper cover has a guide surface for directing airflow toward the bottom of the cookware;

[0008] Multiple top swirl elements are spaced apart and protrude from the guide surface, with a top swirl channel formed between two adjacent top swirl elements and the guide surface, such that the flow direction of the flue gas passing through the top swirl channel is arranged axially around the combustion chamber; and

[0009] The lower cover, together with the upper cover, forms a heat-insulating cavity.

[0010] In some embodiments, the top swirl element includes:

[0011] An arc-shaped swirl section protrudes from the guide surface and extends in an arc shape; and / or;

[0012] A planar swirling section protrudes from the guide surface, and the planar swirling section is arranged at an angle to the radial direction of the combustion chamber passing through it.

[0013] In some embodiments, the projections of two adjacent top swirl elements along the radial direction of the heat shield passing through them do not overlap; and / or,

[0014] Along the inside-out direction of the heat insulation cover, the distance between two adjacent top swirling elements gradually increases in the circumferential direction of the heat insulation cover.

[0015] In some embodiments, the top swirl element has a chamfer at one end near the combustion chamber and on the side away from the guide surface.

[0016] In some embodiments, on the side near the combustion chamber, the upper cover and the lower cover are spaced apart to form a gas injection channel, the gas injection channel having a gas outlet communicating with the combustion chamber; the heat insulation cover further includes:

[0017] Multiple central swirl elements are spaced apart in the air supply channel, and a central swirl channel is formed between two adjacent central swirl elements. The central swirl channel is used to change the flow direction of secondary air in the air supply channel, so that the flow direction of secondary air blown out from the air outlet is arranged around the axial direction of the combustion chamber.

[0018] In some embodiments, the swirl direction of the flue gas guided by the top swirl element is the same as or opposite to the swirl direction of the secondary air guided by the middle swirl element.

[0019] In some embodiments, the central swirl element includes:

[0020] An arc-shaped swirl plate is disposed within the air supply channel and extends in an arc shape; and / or;

[0021] A planar swirl plate is disposed within the air supply channel, and the planar swirl plate is arranged at an angle to the radial direction of the combustion chamber passing through it.

[0022] In some embodiments, the upper housing includes:

[0023] upper body;

[0024] An upper inner extension is provided on the side of the upper body near the combustion chamber;

[0025] The lower cover includes:

[0026] Lower body;

[0027] The lower inner extension is disposed on the side of the lower body near the combustion chamber;

[0028] The upper inner extension and the lower inner extension are spaced apart to form the air supply channel. The lower inner extension and / or the lower body have an air inlet that communicates with the air supply channel. Secondary air enters the air supply channel through the air inlet. The middle swirl member is connected to the upper inner extension and / or the lower inner extension.

[0029] In some embodiments, the central swirl element is connected to the lower inner extension, and the top end of the central swirl element is spaced apart from the upper inner extension along the axial direction of the combustion chamber.

[0030] In some embodiments, the upper housing further includes:

[0031] An inner flow-blocking section is disposed on the side of the upper body near the combustion chamber, and is inclined downward or vertically downward in the direction of the lower cover to connect with the upper inner extension. The inner flow-blocking section has an inner flow-blocking surface facing the combustion chamber, and the inner flow-blocking surface is used to gather smoke towards the bottom of the cookware.

[0032] The upper body, the inner flow-blocking portion, and the upper inner extension portion constitute an inner step structure.

[0033] In some embodiments, the air inlet is located on the lower body, and the opening area of ​​the air inlet is larger than the opening area of ​​the air outlet.

[0034] In some embodiments, the upper housing further includes:

[0035] The upper extension portion is disposed on the side of the upper body away from the combustion chamber and extends towards the lower body, forming an extension space;

[0036] The lower cover also includes:

[0037] The lower extension portion is disposed on the side of the lower body away from the combustion chamber and extends into the extension space in a direction close to the upper body. The lower extension portion is partially connected to the upper extension portion.

[0038] In some embodiments, the upper extension portion includes:

[0039] The connecting sub-part is connected to the lower extension portion;

[0040] An epitaxial sub-part is provided at a distance from the lower epitaxial part along the radial direction of the combustion chamber;

[0041] Wherein, along the radial direction of the combustion chamber, there is a second distance D2 between the outer epitaxial portion and the lower epitaxial portion, wherein D2 satisfies 0.2mm≤D2≤1mm.

[0042] In some embodiments, the heat shield further includes:

[0043] A partition is disposed within the heat insulation cavity and connects the upper cover and the lower cover. The partition divides the heat insulation cavity into a first cavity and a second cavity. The first cavity is located on the side of the partition facing the upper cover, and the second cavity is located on the side of the partition facing the lower cover.

[0044] In some embodiments, the separator includes:

[0045] The main body, together with the upper cover, forms a first cavity;

[0046] A partition is provided at least on the side of the upper body facing the upper cover, the partition dividing the first cavity into multiple partitioned cavities to reduce the flow of air within the first cavity.

[0047] In some embodiments, a heat insulation layer is provided on the surface of the main body and the surface of the partition, the heat insulation layer being used to reduce the transfer of heat from the first cavity to the second cavity.

[0048] In some embodiments, along the axial direction of the combustion chamber, the partition is spaced apart from the top of the main body from the upper cover.

[0049] In some embodiments, along the axial direction of the combustion chamber, there is a third gap dimension L3 between the top of the partition and the upper cover, wherein L3 satisfies: 0.5mm≤L3≤2mm.

[0050] In some embodiments, the heat shield further includes:

[0051] An insulating filler is placed inside the first cavity to reduce the flow of air within the first cavity.

[0052] In some embodiments, it also includes:

[0053] Upper support legs, connected to the upper cover and higher than the top swirl element, are used to support the cookware; and

[0054] The lower support foot is connected to the lower cover and is used to support the lower cover.

[0055] This application also provides a gas stove, including:

[0056] Burner;

[0057] The heat insulation cover, as described in any of the above embodiments, is installed outside the burner.

[0058] The heat insulation cover based on this application includes a heat insulation cavity formed by an upper cover and a lower cover. The heat insulation cavity helps to reduce the loss of heat to the external environment through heat conduction and radiation, thereby improving the overall thermal efficiency of the gas stove.

[0059] Furthermore, multiple top swirling elements are provided on the guide surface of the upper cover to form a top swirling channel, which allows the high-temperature flue gas to circulate around the combustion chamber axially when it flows through, which helps to prolong the contact time between the flue gas and the cookware, improves the absorption of heat from the flue gas by the cookware, and thus helps to improve the overall thermal efficiency of the gas stove.

[0060] Furthermore, the arrangement of multiple top swirling elements creates a swirling flow of flue gas, which helps to distribute the flue gas more evenly at the bottom of the cookware, reducing local overheating or underheating. Attached Figure Description

[0061] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0062] Figure 1 This is a schematic diagram of the structure of the heat insulation cover in one embodiment of this application;

[0063] Figure 2 This is an exploded structural diagram of the heat insulation cover in one embodiment of this application;

[0064] Figure 3 This is an exploded structural diagram of the heat insulation cover in another embodiment of this application;

[0065] Figure 4 This is a schematic diagram of another structure of the heat insulation cover in one embodiment of this application;

[0066] Figure 5 For along Figure 4 A schematic diagram of a cross-sectional structure along line AA in the middle;

[0067] Figure 6 for Figure 5 Enlarged structural diagram at point B;

[0068] Figure 7 This is a cross-sectional view of the heat insulation cover in one embodiment of this application;

[0069] Figure 8 for Figure 7 Enlarged structural diagram at point C;

[0070] Figure 9 This is a schematic diagram of the structure of the heat insulation cover in another embodiment of this application;

[0071] Figure 10 For along Figure 9 A schematic diagram of a cross-sectional structure of the DD line in the middle;

[0072] Figure 11 for Figure 10 A magnified structural diagram at point E in the middle.

[0073] Explanation of reference numerals in the attached drawings: 1. Heat shield; 1A. Combustion chamber; 1B. Heat shield; 1B1. First chamber; 1B2. Second chamber; 1C. Air supply channel; 1C1. Air outlet; 11. Upper cover; 111. Upper body; 111A. Guide surface; 112. Upper inner extension; 113. Upper outer extension; 113A. Extension space; 1131. Connecting sub-section; 1132. Outer extension sub-section; 114. Inner flow obstruction section; 114A. Inner flow obstruction surface; 115. Outer flow obstruction section; 115A. Outer flow obstruction surface; 116. Top swirl element ; 116A, Top swirl channel; 1161, Arc-shaped swirl section; 1161A, Chamfer; 1161B, Cut corner; 12, Lower cover; 121, Lower body; 121A, Air inlet; 122, Lower inner extension; 123, Middle swirl component; 123A, Middle swirl channel; 1231, Arc-shaped swirl plate; 124, Lower outer extension; 13, Separator; 13A, Heat insulation layer; 131, Main body; 132, Settlement platform; 133, Separator; 133A, Separator cavity; 14, Upper support foot; 15, Lower support foot. Detailed Implementation

[0074] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0075] Please refer to Figure 1 This application provides a gas stove (not shown in the figure). In this embodiment, the gas stove includes a heat insulation cover 1 and a burner (not shown in the figure). The burner is the core component of the gas stove, responsible for mixing and igniting gas and air to produce a flame for cooking. The heat insulation cover 1 surrounds the outside of the burner to isolate the flame from high-temperature flue gas, reducing heat loss. Furthermore, the heat insulation cover 1 is placed on the stovetop to support the cookware, preventing it from sliding or tipping over during heating, reducing the risk of accidental injury, and ensuring the stability of the cooking process.

[0076] The heat insulation cover 1 has a combustion chamber 1A in the middle for placing the burner. In this way, the flame generated by the burner during operation will pass through the combustion chamber 1A to contact the bottom of the cookware and heat the cookware. Furthermore, under the surrounding arrangement of the heat insulation cover 1, the heat of the burner can be concentrated and transferred towards the bottom of the cookware, preventing heat leakage. This allows the heat generated by the burner to be fully applied to the cookware, thereby improving the thermal efficiency of the burner.

[0077] It is understood that the heat shield 1 has a ring-shaped structure with a combustion chamber 1A at its center. Of course, depending on the actual needs, the heat shield 1 can also be a square ring or other shapes; the combustion chamber 1A can also be a circular hole, a square hole, or other shaped hole. In the embodiments of this application, there are no specific limitations on the overall shape of the heat shield 1 and the shape of the combustion chamber 1A.

[0078] Please refer to Figure 1 and Figure 2 In one embodiment, the heat insulation cover 1 includes an upper cover 11 and a lower cover 12. The upper cover 11 is the upper structure of the heat insulation cover 1, and the lower cover 12 is the lower structure of the heat insulation cover 1. The upper cover 11 and the lower cover 12 can be made of any one of stainless steel, aluminum alloy, carbon steel, and cast iron. The outer surfaces of the upper cover 11 and the lower cover 12 can be coated with one of an anti-corrosion coating, a ceramic coating, and an anodized coating to improve the corrosion resistance, wear resistance, ease of cleaning, or heat reflectivity of the upper cover 11 and the lower cover 12.

[0079] The lower cover 12 works in conjunction with the upper cover 11 to form a heat insulation cavity 1B. The main function of the heat insulation cavity 1B is to isolate the flame and high-temperature flue gas, reducing heat loss to the surrounding environment and thus improving the thermal efficiency of the gas stove. The design of the heat insulation cavity 1B helps maintain the high temperature of the combustion zone while preventing the flame from directly contacting the external structure of the heat insulation cover 1, reducing the risk of fire.

[0080] The upper body 111 has a guide surface 111A on the side opposite to the lower cover 12. Understandably, the guide surface 111A is set towards the bottom of the cookware, which helps to guide the high-temperature flue gas directly to the bottom of the cookware, thereby increasing the contact area between the flue gas and the cookware and improving the heat exchange efficiency.

[0081] Please continue reading. Figure 1 and Figure 2 Furthermore, the heat insulation cover 1 also includes a plurality of top swirl elements 116, which are spaced apart and protrude from the guide surface 111A. The top swirl elements 116 can be used to support the bottom of the cookware. A top swirl channel 116A is formed between two adjacent top swirl elements 116 and the guide surface 111A, so that the flow direction of the flue gas flowing through the top swirl channel 116A is arranged around the axial direction of the combustion chamber 1A, thereby extending the contact path between the high-temperature flue gas and the bottom surface of the cookware, thereby increasing the contact time between the high-temperature flue gas and the bottom surface of the cookware, and improving the heating efficiency of the cookware.

[0082] Furthermore, the arrangement of multiple top swirl elements 116 causes the flue gas to form a swirling flow, which helps to distribute the flue gas more evenly at the bottom of the cookware and reduces local overheating or underheating.

[0083] For example, the number of top swirl elements 116 can be 4, 6, 8, or 10. In other embodiments, the number of top swirl elements 116 can also be other. In the embodiments of this application, there is no specific limitation on the number of top swirl elements 116.

[0084] like Figure 2 As shown, specifically, the top swirl member 116 may include an arc-shaped swirl section 1161, which protrudes from the guide surface 111A and extends in an arc shape, so that the top swirl channel 116A is arc-shaped, thereby further extending the contact path between the high-temperature flue gas and the bottom surface of the cookware, thereby further increasing the contact time between the high-temperature flue gas and the bottom surface of the cookware and improving the heating efficiency of the cookware.

[0085] Furthermore, the arc-shaped swirl section 1161 and the upper cover 11 are integrally formed components. The arc-shaped swirl section 1161 can be protruded onto the guide surface 111A by stamping, reducing connection points and seams, allowing the flue gas to move along a preset path. The integrally formed component also reduces assembly steps and the number of required parts, which can reduce manufacturing costs and production time. The integrally formed component is more robust than a structure assembled from multiple independent parts, which helps to improve the structural strength and durability of the entire heat insulation cover 1.

[0086] In other embodiments, the top swirl member 116 may include a planar swirl portion (not shown in the figure), which protrudes from the guide surface 111A and is arranged at an angle to the radial direction of the combustion chamber 1A passing through it. This can also extend the contact path between the high-temperature flue gas and the bottom surface of the cookware, thereby increasing the contact time between the high-temperature flue gas and the bottom surface of the cookware and improving the heating efficiency of the cookware. In the embodiments of this application, the specific form of the top swirl member 116 is not limited.

[0087] Please continue reading. Figure 2 In one embodiment, the radial projections of two adjacent top swirl elements 116 through their own heat shield 1 do not overlap, so that the top swirl channel 116A formed between the two adjacent top swirl elements 116 is larger, thereby increasing the contact area between the high-temperature flue gas and the bottom surface of the cookware, thereby improving the heating efficiency of the cookware.

[0088] In one embodiment, along the direction from the inside to the outside of the heat insulation cover 1, the distance between two adjacent top swirling elements 116 in the circumferential direction of the heat insulation cover 1 gradually increases, which can also increase the contact area between the high-temperature flue gas and the bottom surface of the cookware, thereby improving the heating efficiency of the cookware.

[0089] Please continue reading. Figure 2In one embodiment, the top swirl member 116 has a chamfer 1161A on the side near the combustion chamber 1A and away from the guide surface 111A. Extending radially from the outer periphery of the upper cover 11 towards the combustion chamber 1A, the chamfer 1161A slopes towards the guide surface 111A. This chamfer reduces airflow resistance near the top swirl member 116, resulting in smoother flue gas flow and improved flue gas flow efficiency. The chamfer 1161A also keeps the top swirl member 116 away from the combustion chamber 1A, thus preventing direct flame damage and increasing the service life of the top swirl member 1. Consequently, the heat shield 1 also has a longer service life.

[0090] In one embodiment, the top swirl has a chamfer 1161B on the side away from the combustion chamber 1A and the guide surface 111A. The chamfer 1161B is positioned opposite to the chamfer 1161A and extends radially from the combustion chamber 1A toward the outer periphery of the upper casing 11, inclined toward the direction close to the guide surface 111A. The design of the chamfer 1161B helps optimize the airflow path from the combustion chamber 1A to the outer periphery of the upper casing 11, reducing airflow resistance near the swirl element and making the flue gas flow smoother. The design of the chamfer 1161B can also serve as a stress concentration mitigation measure, reducing material fatigue caused by thermal or mechanical stress and improving the structural strength and durability of the top swirl element 116.

[0091] Please see Figure 4 and Figure 5 In one embodiment, the height of the guide surface 111A gradually decreases along the direction close to the combustion chamber 1A, which can control the rate of change of the cross-sectional area of ​​the flow channel during the flow of flue gas from the inside to the outside to be low, thereby making the flow velocity of the flue gas slower, so as to prolong the contact time between the flue gas and the bottom surface of the cookware, thereby improving the heating efficiency of the cookware.

[0092] The angle between the guide surface 111A and the horizontal plane is the first angle α, which satisfies: 5°≤α≤15°. This allows the flue gas to flow at a slower speed, resulting in a longer contact time between the flue gas and the bottom surface of the cookware, thereby improving the heating efficiency of the cookware.

[0093] If α < 5°, the angle between the guide surface 111A and the horizontal plane will be too small, resulting in a shorter contact time between the flue gas and the bottom surface of the cookware, leading to poor heating effect on the cookware.

[0094] If α > 15°, the flue gas will flow faster, resulting in a shorter contact time between the flue gas and the bottom surface of the cookware, leading to a poor heating effect on the cookware.

[0095] like Figure 1 and Figure 7 As shown, in one embodiment, on the side near the combustion chamber 1A, the upper cover 11 and the lower cover 12 are spaced apart, and a gas supply channel 1C is formed between the upper cover 11 and the lower cover 12. The gas supply channel 1C has an outlet 1C1 that communicates with the combustion chamber 1A. The gas supply channel 1C is used to blow out preheated secondary air through the outlet 1C1, thereby using the preheated secondary gas to supply gas to the burner, which can increase the combustion temperature of the burner and thus improve the overall thermal efficiency of the gas stove.

[0096] like Figure 2 and Figure 3 As shown, the heat shield 1 further includes multiple central swirl elements 123, which are spaced apart within the air supply channel 1C. A central swirl channel 123A is formed between adjacent central swirl elements 123. The central swirl channel 123A is used to change the flow direction of secondary air within the air supply channel 1C. The power for the secondary air flow comes from the negative pressure suction generated by the outer ring burner holes. When secondary air passes through the central swirl elements 123, the design of the central swirl elements 123 causes the air to flow within the central swirl channel 123A and form a swirling flow. This causes the flow direction of the secondary air blown out from the air outlet 1C1 to be axially aligned around the combustion chamber 1A, i.e., to supply air to the root of the outer ring burner holes. Compared to the method of secondary air directly flowing to the root of the burner holes for air supply, the secondary air and the central jet have a tangential velocity during the swirling air supply process. This swirling effect can increase the kinetic energy of the air flow, making the air flow more active and uniform. Because swirling can increase the contact area and contact time between secondary air and primary air mixture, thereby improving mixing efficiency.

[0097] The design of the central swirl element 123 can also extend the mixing path between the secondary air and the primary air mixture. Under the same conditions, it can reduce the amount of secondary air supplied, thereby increasing the flame temperature and improving the combustion efficiency of the gas stove. The airflow in the central swirl channel 123A absorbs heat from the upper cover 11 and lower cover 12 as it passes through, thus preheating the secondary air. The preheated secondary air can further increase the flame temperature and improve the thermal efficiency of the gas stove.

[0098] It is understandable that primary gas mixing refers to the mixture of gas and air originating from the injector pipe connected to the burner. When the injector pipe supplies primary gas mixing to the burner, the primary gas mixture flows at a relatively high speed in the combustion chamber 1A, resulting in a lower gas pressure in the combustion chamber 1A. This allows secondary air to be drawn into the combustion chamber 1A through the gas supply channel 1C, thereby replenishing the burner with secondary air and improving the overall thermal efficiency of the gas stove.

[0099] In one embodiment, the radial projections of two adjacent central swirl elements 123 passing through their own heat shield 1 do not overlap. Avoiding overlapping projections ensures a more uniform airflow distribution within the air supply channel 1C. Each central swirl element 123 can influence the airflow around it, reducing dead zones and improving the overall combustion efficiency of the combustion chamber 1A. Furthermore, each central swirl element 123 is easier to clean and maintain because their radial projections do not obstruct each other.

[0100] like Figure 2 As shown, in one configuration, the swirl direction of the flue gas guided by the top swirl element 116 is the same as the swirl direction of the secondary air guided by the middle swirl element 123. When the swirl directions of the flue gas and secondary air are consistent, the swirl effect is enhanced, making the airflow more active and uniform, and the flue gas path longer, which helps to improve combustion efficiency. Furthermore, the consistent swirl direction ensures more thorough mixing of the flue gas and secondary air within the combustion chamber 1A. The secondary air also assists in providing insulation, increasing the contact area and contact time, thereby improving mixing efficiency. Consistent swirl directions help to create a stable combustion environment, making the combustion process more uniform and stable.

[0101] In another configuration, the swirl direction of the flue gas guided by the top swirl element 116 is opposite to the swirl direction of the secondary air guided by the middle swirl element 123. When the swirl directions of the flue gas and the secondary air are opposite, the opposite swirl directions help to break the stability of the airflow, increase turbulence, thereby promoting the mixing between the flue gas and the secondary air, resulting in better mixing and more complete combustion.

[0102] Specifically, the central swirl element 123 may include an arc-shaped swirl plate 1231, which is disposed in the gas supply channel 1C and extends in an arc shape, thereby making the central swirl channel 123A arc-shaped to extend the movement path of the secondary air, thereby increasing the preset temperature of the secondary air and thus improving the overall thermal efficiency of the gas stove.

[0103] It is understood that the central swirl element 123 may also include a planar swirl plate (not shown in the figure). The planar swirl plate is disposed within the air supply channel 1C, and is set at an angle to the radial direction of the combustion chamber 1A passing through it. This can also change the flow direction of the secondary air, so that the secondary air blown out from the air outlet 1C1 is arranged around the axial direction of the combustion chamber 1A, thereby extending the movement path of the secondary air and increasing the preset temperature of the secondary air, which in turn can improve the overall thermal efficiency of the gas stove. It is understood that the planar swirl plate is easier to process and manufacture, and the arc-shaped swirl plate 1231 has a better swirl effect. In this embodiment, the specific form of the central swirl element 123 is not limited.

[0104] like Figure 3As shown, in one embodiment, the upper cover 11 includes an upper body 111 and an upper inner extension 112, with the upper inner extension 112 disposed on the side of the upper body 111 near the combustion chamber 1A. The lower cover 12 includes a lower body 121 and a lower inner extension 122, with the lower inner extension 122 disposed on the side of the lower body 121 near the combustion chamber 1A. The upper inner extension 112 and the lower inner extension 122 are spaced apart to form a supplementary air channel 1C. Since both the upper inner extension 112 and the lower inner extension 122 are located near the combustion chamber 1A, i.e., the supplementary air channel 1C is located near the combustion chamber 1A, it can be ensured that secondary air (additional oxygen supply) is effectively guided to the vicinity of the combustion chamber 1A, thereby supporting more complete combustion.

[0105] It is understood that when the upper cover 11 is made of metal, the upper body 111 and the upper inner extension 112 can be obtained by stamping and bending, so that the upper body 111 and the upper inner extension 112 are integrally formed. This allows the upper body 111 and the upper inner extension 112 to have high structural strength, reducing the probability of damage to the upper body 111 and the upper inner extension 112, thereby allowing the upper cover 11 to have a longer service life, and thus allowing the heat insulation cover 1 to have a longer service life. It is understood that the upper body 111 and the upper inner extension 112 can also be processed separately and then connected by welding. In the embodiments of this application, the specific forming method of the upper body 111 and the upper inner extension 112 is not limited. Similarly, the specific forming method of the lower body 121 and the lower inner extension 122 is not specifically limited, and will not be elaborated on here.

[0106] like Figure 2 and Figure 3 As shown, in one configuration, the lower inner extension 122 or the lower body 121 has an air inlet 121A communicating with the air supply channel 1C. The air inlet 121A, located on the lower inner extension 122, is closer to the air supply channel 1C, resulting in a shorter inflow path for the secondary air. This shorter airflow path allows the secondary air supply to respond more quickly to changes in combustion demand, improving the burner's response speed. Furthermore, the air inlet 121A, located on the lower body 121, can be designed to be larger, thereby allowing more secondary air to flow in and supporting higher combustion demands.

[0107] In another configuration, both the lower inner extension 122 and the lower body 121 may be provided with air inlets 121A. Positioning the air inlets 121A in different locations provides design flexibility, allowing optimization of the secondary air supply inlet 121A position based on specific burner configurations and performance requirements. In this embodiment, the position of the air inlet 121A is not limited.

[0108] like Figure 2and Figure 7 As shown, specifically, multiple air inlets 121A are provided. These multiple air inlets 121A can be multiple square or multiple circular openings spaced around the combustion chamber 1A. This application does not limit the shape of the air inlets 121A.

[0109] In one embodiment, the air inlet 121A is located on the lower body 121, and the opening area of ​​the air inlet 121A is larger than the opening area of ​​the air outlet 1C1. This increases the secondary air velocity within the central swirl channel 123A. The increased velocity promotes the mixing efficiency between the secondary air and the primary mixture, as the faster airflow helps to disperse the air, allowing it to mix more evenly with the fuel. Furthermore, it reduces dead zones in the supplementary air channel 1C, ensuring that both the primary and secondary air are fully mixed, thus enhancing the combustion process.

[0110] Secondary air enters the supplementary air passage 1C via the air inlet 121A, specifically into the central swirl passage 123A. In one configuration, the central swirl element 123 is connected to either the upper inner extension 112 or the lower inner extension 122. When the central swirl element 123 is connected to the upper inner extension 112, the airflow guided by the upper inner extension 112 is closer to the combustion zone, which helps optimize the shape and distribution of the flame. When the central swirl element 123 is connected to the lower inner extension 122, it helps improve thermal efficiency and minimizes heat loss.

[0111] like Figure 4 and Figure 5 As shown, specifically, the middle swirl element 123 is connected to the upper inner extension 112. Along the axial direction of the combustion chamber 1A, the bottom end of the middle swirl element 123 is spaced apart from the lower inner extension 122. Since the upper inner extension 112 is closer to the cookware, it helps to guide the swirling air into the flame more directly, thereby potentially improving the stability of the flame and the combustion efficiency.

[0112] Alternatively, the central swirl element 123 is connected to the lower inner extension 122. Along the axial direction of the combustion chamber 1A, the top of the central swirl element 123 is spaced apart from the upper inner extension 112. This reduces heat transfer from the upper inner extension 112 to the lower inner extension 122 along the central swirl element 123, thereby reducing overall heat loss from the upper casing 11 and mitigating the thermal bridging effect. Because more heat is retained in the combustion zone, the upper casing 11 can generate more heat, rather than being transferred to other parts through the structure, thus improving the overall thermal efficiency of the gas stove.

[0113] In another configuration, the central swirl element 123 is connected to both the upper inner extension 112 and the lower inner extension 122. The connection between the upper inner extension 112 and the lower inner extension 122 provides better support, making the central swirl element 123 more stable during operation. Due to the improved stability of the central swirl element 123, the flow of secondary air through the central swirl element 123 is smoother, which helps maintain the stability of the flame and the combustion efficiency.

[0114] Specifically, along the axial direction of the combustion chamber 1A, there is a first distance D1 between the top end of the central swirl member 123 and the upper inner extension 112 (e.g., ...). Figure 8 As shown), D1 satisfies: 0.1mm≤D1≤1mm, so that the heat from the upper inner extension 112 is not easily transferred to the central swirl member 123, resulting in slower heat dissipation from the upper cover 11 and higher heat output from the upper cover 11, thus improving the overall thermal efficiency of the gas stove. Furthermore, the central swirl member 123 can guide the secondary air, increasing the contact area between the secondary air and the central swirl member 123, thereby improving the heating efficiency of the secondary air and further enhancing the overall thermal efficiency of the gas stove.

[0115] If D1 < 0.1mm, the distance between the top of the middle swirl element 123 and the upper inner extension 112 will be too close, making it easy for the heat of the upper inner extension 112 to be transferred to the middle swirl element 123, resulting in faster heat loss from the upper cover 11, lower heat in the upper cover 11, and lower overall thermal efficiency of the gas stove.

[0116] If D1 > 1mm, the distance between the top of the middle swirl element 123 and the upper inner extension 112 will be too far, resulting in a poor guiding effect of the middle swirl element 123, a small contact area with the secondary air, a low heating efficiency for the secondary air, and a low overall thermal efficiency of the gas stove.

[0117] like Figure 2 and Figure 7 As shown, in one embodiment, the upper cover 11 further includes an inner flow-blocking portion 114. The inner flow-blocking portion 114 is disposed on the side of the upper body 111 near the combustion chamber 1A, and is inclined downward or vertically downward towards the lower cover 12 to connect with the upper inner extension portion 112. The inner flow-blocking portion 114 has an inner flow-blocking surface 114A facing the combustion chamber 1A. The inner flow-blocking surface 114A is used to gather flue gas towards the bottom of the cookware, thereby enhancing the contact between the flue gas and the bottom of the cookware, so that the bottom surface of the cookware has higher heat and the cookware heats up faster, thereby improving the overall thermal efficiency of the gas stove.

[0118] The upper body 111, the inner flow-blocking part 114, and the upper inner extension part 112 constitute an inner step structure. Through the design of the inner step structure, the heat generated by the gas stove can be utilized more effectively, the ineffective heat loss can be reduced, and the overall heat energy utilization rate of the gas stove can be improved.

[0119] like Figure 3 As shown, in one embodiment, the upper cover 11 further includes an outer flow-blocking portion 115 and an upper outer extension portion 113. The outer flow-blocking portion 115 is disposed on the side of the upper body 111 away from the combustion chamber 1A, and is inclined upward or vertically upward in the direction away from the lower cover 12. The outer flow-blocking portion 115 has an outer flow-blocking surface 115A facing the combustion chamber 1A. The upper outer extension portion 113 extends from the top of the outer flow-blocking portion 115 along the direction from the inside to the outside of the heat insulation cover 1. The upper outer extension portion 113, the outer flow-blocking portion 115, and the upper body 111 form an outer step structure. The outer step structure forms a flue with a certain gap and direction between itself and the bottom of the cookware, so that the flow of flue gas is deflected upward. During the flow, the flue gas washes against the bottom surface of the cookware as much as possible, further improving the absorption of heat from the flue gas by the cookware and improving the overall thermal efficiency of the cookware.

[0120] Furthermore, the upper extension portion 113 is disposed on the side of the upper body 111 away from the combustion chamber 1A and extends towards the lower cover 12, forming an extension space 113A; the lower cover 12 also includes a lower extension portion 124, which is disposed on the side of the lower body 121 away from the combustion chamber 1A and extends towards the upper body 111 into the extension space 113A. The lower extension portion 124 is partially connected to the upper extension portion 113 to reduce the contact area between the upper extension portion 113 and the lower extension portion 124, thereby reducing the heat transfer from the upper extension portion 113 to the lower extension portion 124, and reducing the overall heat dissipation efficiency of the upper cover 11.

[0121] like Figure 3 and Figure 6 As shown, specifically, the upper extension portion 113 includes a connecting sub-portion 1131 and an extension sub-portion 1132, with the connecting sub-portion 1131 connected to the lower extension portion 124. Along the radial direction of the combustion chamber 1A, the extension sub-portion 1132 and the lower extension portion 124 are spaced apart. A second distance D2 exists between the extension sub-portion 1132 and the lower extension portion 124 along the radial direction of the combustion chamber 1A, where D2 satisfies 0.2mm≤D2≤1mm. This ensures that heat from the upper extension portion 113 is not easily transferred to the lower extension portion 124, resulting in slower heat dissipation from the upper cover 11 and higher heat output from the upper cover 11, thus improving the overall thermal efficiency of the gas stove. It also prevents heat from the insulation chamber 1B from easily dissipating outwards through the gap, resulting in slower heat loss from the insulation chamber 1B, further increasing the heat output of the upper cover 11 and ultimately improving the overall thermal efficiency of the gas stove.

[0122] If D2 < 0.2mm, the distance between the outer extension 1132 and the lower extension 124 will be too close, causing the heat of the upper extension 113 to be easily transferred to the lower extension 124, resulting in faster heat loss from the upper cover 11, lower heat in the upper cover 11, and lower overall thermal efficiency of the gas stove.

[0123] If D2 > 1mm, the distance between the outer extension portion 1132 and the lower extension portion 124 will be greater, resulting in a larger gap between them. This will cause the heat in the insulation cavity 1B to easily dissipate outward through the gap, leading to a faster decrease in the heat in the insulation cavity 1B. Consequently, the heat in the upper cover 11 will be lower, resulting in a lower overall thermal efficiency of the gas stove.

[0124] It is understood that the connection method between the connecting sub-part 1131 and the lower extension part 124 may be, but is not limited to, at least one of screwing, welding and riveting. In the embodiments of this application, no specific limitation is made on the connection method between the connecting sub-part 1131 and the lower extension part 124.

[0125] like Figure 2 and Figure 5 As shown, in one embodiment, the heat insulation cover 1 further includes a separator 13, which is disposed in the heat insulation cavity 1B and connects the upper cover 11 and the lower cover 12. By using the separator 13 disposed in the heat insulation cavity 1B, the heat insulation cover 1 forms a three-layer structure, thereby reducing the efficiency of heat transfer from the upper cover 11 to the lower cover 12, thus reducing the efficiency of heat loss from the upper cover 11, and thereby increasing the heat of the upper cover 11, thereby improving the overall thermal efficiency of the gas stove.

[0126] like Figure 5 As shown, the partition 13 divides the heat insulation cavity 1B into a first cavity 1B1 and a second cavity 1B2. The first cavity 1B1 is located on the side of the partition 13 facing the upper cover 11, and the second cavity 1B2 is located on the side of the partition 13 facing the lower cover 12. By setting the first cavity 1B1 and the second cavity 1B2, heat transfer from the upper cover 11 to the lower cover 12 via heat conduction can be reduced, thus lowering the vertical heat transfer efficiency. Since the heat dissipation efficiency of the upper cover 11 is low, more heat can be retained in the combustion zone for heating the cookware.

[0127] like Figure 9 and Figure 10As shown, in one embodiment, the partition 13 includes a main body 131 and a partition 133. The main body 131 and the upper cover 11 form a first cavity 1B1. The partition 133 is at least disposed on the side of the main body 131 facing the upper cover 11, dividing the first cavity 1B1 into multiple partitioned chambers 133A. The partition 133 can be disposed perpendicular to the main body 131 to reduce airflow within the first cavity 1B1. The partition 133 reduces natural convection in the first cavity 1B1 caused by uneven heating, maximizing the static state of the air within the first cavity 1B1 and improving the insulation effect of the partition 13.

[0128] like Figure 10 As shown, it can be understood that the partition 133 can be an annular partition 133, and multiple annular partitions 133 can be provided. Two adjacent annular partitions 133 are arranged radially apart along the combustion chamber 1A. Two adjacent annular partitions 133, together with the main body 131 and the upper cover 11, form an annular partition cavity 133A to separate the first cavity 1B1, thereby reducing the air flow in the first cavity 1B1 and reducing the heat loss of the first cavity 1B1, so as to reduce the heat loss of the upper cover 11 and keep the upper cover 11 at a higher temperature to improve the overall thermal efficiency of the gas stove.

[0129] like Figure 7 As shown, in one embodiment, a heat insulation layer 13A is provided on the surface of the main body 131 and the surface of the partition 133. The heat insulation layer 13A is used to reduce the heat transfer from the first cavity 1B1 to the second cavity 1B2, thereby reducing the heat loss of the first cavity 1B1, reducing the heat loss of the upper cover 11, and thus making the heat of the upper cover 11 higher, thereby making the overall thermal efficiency of the gas stove higher.

[0130] It is understood that the heat insulation layer 13A may include at least one of a reflective heat insulation coating, a reflective heat insulation coating, and a composite heat insulation coating. In the embodiments of this application, the specific form of the heat insulation layer 13A is not limited.

[0131] It is understood that the connection method between the main body 131 and the lower cover 12 may be, but is not limited to, at least one of screwing, welding, and riveting. In this embodiment, no specific limitation is made on the connection method between the main body 131 and the lower cover 12. The connection method between the bent portion and the upper cover 11 may be, but is not limited to, at least one of screwing, welding, and riveting. In this embodiment, no specific limitation is made on the connection method between the bent portion and the upper cover 11.

[0132] In one embodiment, along the radial direction of the combustion chamber 1A, there is a first spacing dimension L1 between two adjacent partitions 133 (e.g., ...). Figure 11As shown, L1 satisfies 10mm≤L1≤20mm, which allows for a more reasonable number of partitions 133, resulting in lower production costs for the partitions 13 and consequently reducing the production cost of the heat insulation cover 1. Furthermore, the close proximity between adjacent heat insulation sections results in a smaller partition cavity 133A, leading to less space for air movement within the partition cavity 133A. This results in slower heat dissipation from the first cavity 1B1, which in turn slows down heat dissipation from the upper cover 11, allowing it to maintain a higher temperature and improve the overall thermal efficiency of the gas stove.

[0133] If L1 < 10mm, the distance between two adjacent partitions 133 will be too close, which will require more partitions 133 to be set in the first cavity 1B1, thus increasing the production cost of the partition 13 and the heat insulation cover 1.

[0134] If L1 > 20mm, the distance between two adjacent partitions 133 will be greater, resulting in a larger partition cavity 133A. This leads to a larger space for air movement within the partition cavity 133A, causing the heat of the first cavity 1B1 to dissipate faster, which in turn leads to a faster heat dissipation from the upper cover 11, resulting in a lower temperature for the upper cover 11.

[0135] like Figure 10 and Figure 11 As shown, in one embodiment, along the axial direction of the combustion chamber 1A, there is a second gap dimension L2 between the main body 131 and the upper cover 11, where L2 satisfies: 10mm ≤ L2 ≤ 25mm. This allows for a greater distance between the main body 131 and the upper cover 11, thereby reducing heat transfer from the upper cover 11 to the main body 131 and maintaining the upper cover 11 at a higher temperature, thus improving the overall thermal efficiency of the gas stove. Furthermore, this also allows for a smaller partition chamber 133A, resulting in less space for air movement within the partition chamber 133A. This leads to slower heat dissipation from the first chamber 1B1, which in turn slows down heat dissipation from the upper cover 11, maintaining the upper cover 11 at a higher temperature and further improving the overall thermal efficiency of the gas stove.

[0136] If L2 < 10mm, the distance between the main body 131 and the upper cover 11 will be too close, causing the heat of the upper cover 11 to be easily transferred to the main body 131, resulting in faster heat loss from the upper cover 11 and a lower temperature for the upper cover 11.

[0137] If L2 > 25mm, the distance between the main body 131 and the upper cover 11 will be too far, resulting in a larger partition cavity 133A. This leads to a larger space for air movement within the partition cavity 133A, causing the heat of the first cavity 1B1 to dissipate faster, which in turn causes the heat of the upper cover 11 to dissipate faster, resulting in a lower temperature for the upper cover 11.

[0138] Referring to Figures 1 and 2, in one embodiment, along the axial direction of the combustion chamber 1A, the partition 133 is spaced apart from the upper cover 11 on the side away from the main body 131. This further reduces the contact area between the partition 13 and the upper cover 11, thereby reducing heat transfer from the upper cover 11 to the partition 13. Consequently, the heat dissipation of the upper cover 11 is slower, allowing the upper cover 11 to maintain a higher temperature and improve the overall thermal efficiency of the gas stove.

[0139] Please refer to Figure 10 and Figure 11 Specifically, along the axial direction of the combustion chamber 1A, there is a third gap dimension L3 between the top of the partition 133 and the upper cover 11, where L3 satisfies: 0.5mm ≤ L3 ≤ 2mm. This reduces heat transfer from the upper cover 11 to the top of the partition 133, allowing the upper cover 11 to maintain a higher temperature and thus improving the overall thermal efficiency of the gas stove. Furthermore, the smaller distance between the top of the partition 133 and the upper cover 11 results in less air movement space, leading to slower heat dissipation from the first chamber 1B1, which in turn slows heat dissipation from the upper cover 11, maintaining it at a higher temperature and further improving the overall thermal efficiency of the gas stove.

[0140] If L3 < 0.5 mm, the distance between the top of the partition 133 and the upper cover 11 will be small, which will make it easier for the heat of the upper cover 11 to be transferred to the partition 133, resulting in faster heat loss from the upper cover 11 and a lower temperature of the upper cover 11.

[0141] If L3 > 2mm, the distance between the top of the partition 133 and the upper cover 11 will be larger, resulting in a larger space between the top of the partition 133 and the upper cover 11. This will cause air to move more easily in the space between the top of the partition 133 and the upper cover 11, resulting in faster heat loss from the upper cover 11 and a lower temperature for the upper cover 11.

[0142] In one embodiment, the heat insulation cover 1 further includes a heat insulation filler, which is filled within the first cavity 1B1 to reduce airflow within the first cavity 1B1. The heat insulation filler is typically made of a material with low thermal conductivity, which can effectively reduce heat transfer through air convection within the first cavity 1B1, thereby improving the heat insulation performance of the heat insulation cover 1. Furthermore, the heat insulation filler can act as a thermal barrier, reducing heat loss and enhancing the heat preservation effect of the gas stove.

[0143] Understandably, the thermal insulation filler may include at least one of the following: aluminum silicate cotton, aluminum silicate board, ceramic fiber, glass fiber, silicate fiber, and silica fiber. In the embodiments of this application, the specific form of the thermal insulation filler is not limited.

[0144] like Figure 5 and Figure 7 As shown, in one embodiment, a recessed platform 132 is provided on the main body 131. The recessed platform 132 is recessed in a direction away from the first cavity 1B1. When only one partition 133 is provided, the recessed platform 132 is located closer to the combustion cavity 1A than the partition 133. The recessed platform 132 can be used to fill the heat insulation filler. The design of the recessed platform 132 provides a stable receiving space for the heat insulation filler, which helps to improve the overall structural stability of the heat insulation cover 1.

[0145] The lower inner extension 122 extends upward at an angle from the connection position with the lower body 121 toward the combustion chamber 1A. A gradually narrowing air supply channel 1C is formed between the portion of the platform 132 and the lower inner extension 122. The design of the gradually narrowing air supply channel 1C can reduce the resistance of air flow. As air flows from a wider area to a narrower area, the flow velocity will naturally increase, enhancing the swirling effect generated by the central swirling element 123. The increase in air velocity can strengthen the swirling intensity and help improve the efficiency of air flow.

[0146] It is understandable that when the partition 13 is made of metal, the main body 131 and the recessed platform 132 can be obtained by stamping so that the main body 131 and the recessed platform 132 are integrally formed, thereby giving the main body 131 and the recessed platform 132 high structural strength, reducing the probability of damage to the recessed platform 132 and the main body 131, and thus giving the partition 13 a longer service life, so that the heat insulation cover 1 can have a longer service life.

[0147] like Figure 1 and Figure 4 As shown, it can be understood that the heat insulation cover 1 may further include an upper support leg 14, which is connected to the upper cover 11 and is higher than the top swirl member 116, for contacting the bottom surface of the cookware to support the cookware. Exemplarily, the number of upper support legs 14 can be 3, 4, 5, or 6. In other embodiments, the number of upper support legs 14 can also be other. In this application embodiment, the number of upper support legs 14 is not specifically limited. Exemplarily, the connection method between the upper support leg 14 and the upper cover 11 includes at least one of screwing, welding, riveting, and snap-fitting. In this application embodiment, the connection method between the upper support leg 14 and the upper cover 11 is not specifically limited.

[0148] Please refer to Figure 1 and Figure 7In one embodiment, a lower support leg 15 is further included. The lower support leg 15 is connected to the lower cover 12 and can be connected to the stove to support the heat insulation cover 1. Exemplarily, the number of lower support legs 15 can be 3, 4, 5, or 6. In other embodiments, the number of lower support legs 15 can also be other. In this application embodiment, the number of lower support legs 15 is not specifically limited. Exemplarily, the connection method between the lower support leg 15 and the lower cover 12 includes at least one of screwing, welding, riveting, and snap-fitting. In this application embodiment, the connection method between the lower support leg 15 and the lower cover 12 is not specifically limited.

[0149] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, 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, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0150] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A heat insulation cover, characterized in that, Applicable to a gas stove, the gas stove including a burner, the heat insulation cover having a combustion chamber formed in the middle for housing the burner, the heat insulation cover including: The upper cover has a guide surface for directing airflow toward the bottom of the cookware; Multiple top swirl elements are spaced apart and protrude from the guide surface, with a top swirl channel formed between two adjacent top swirl elements and the guide surface, such that the flow direction of the flue gas passing through the top swirl channel is arranged axially around the combustion chamber; and The lower cover, together with the upper cover, forms a heat-insulating cavity.

2. The heat insulation cover as described in claim 1, characterized in that, The top swirl element includes: An arc-shaped swirl section protrudes from the guide surface and extends in an arc shape; and / or; A planar swirling section protrudes from the guide surface, and the planar swirling section is arranged at an angle to the radial direction of the combustion chamber passing through it.

3. The heat insulation cover as described in claim 1, characterized in that, The projections of two adjacent top swirl elements along the radial direction of the heat shield passing through them do not overlap; and / or, Along the inside-out direction of the heat insulation cover, the distance between two adjacent top swirling elements gradually increases in the circumferential direction of the heat insulation cover.

4. The heat insulation cover as described in claim 1, characterized in that, The top swirl element has a chamfer on the side closest to the combustion chamber and furthest from the guide surface.

5. The heat insulation cover as described in claim 1, characterized in that, On the side near the combustion chamber, the upper cover and the lower cover are spaced apart to form a gas supply channel, the gas supply channel having a gas outlet communicating with the combustion chamber; the heat insulation cover further includes: Multiple central swirl elements are spaced apart in the air supply channel, and a central swirl channel is formed between two adjacent central swirl elements. The central swirl channel is used to change the flow direction of secondary air in the air supply channel, so that the flow direction of secondary air blown out from the air outlet is arranged around the axial direction of the combustion chamber.

6. The heat insulation cover as described in claim 5, characterized in that, The swirl direction of the flue gas guided by the top swirl element is the same as or opposite to the swirl direction of the secondary air guided by the middle swirl element.

7. The heat insulation cover as described in claim 5, characterized in that, The central swirl element includes: An arc-shaped swirl plate is disposed within the air supply channel and extends in an arc shape; and / or; A planar swirl plate is disposed within the air supply channel, and the planar swirl plate is arranged at an angle to the radial direction of the combustion chamber passing through it.

8. The heat insulation cover as described in claim 5, characterized in that, The upper cover includes: upper body; An upper inner extension is provided on the side of the upper body near the combustion chamber; The lower cover includes: Lower body; The lower inner extension is disposed on the side of the lower body near the combustion chamber; The upper inner extension and the lower inner extension are spaced apart to form the air supply channel. The lower inner extension and / or the lower body have an air inlet that communicates with the air supply channel. Secondary air enters the air supply channel through the air inlet. The middle swirl member is connected to the upper inner extension and / or the lower inner extension.

9. The heat insulation cover as described in claim 8, characterized in that, The central swirl element is connected to the lower inner extension, and along the axial direction of the combustion chamber, the top end of the central swirl element is spaced apart from the upper inner extension.

10. The heat insulation cover as described in claim 8, characterized in that, The upper cover also includes: An inner flow-blocking section is disposed on the side of the upper body near the combustion chamber, and is inclined downward or vertically downward in the direction of the lower cover to connect with the upper inner extension. The inner flow-blocking section has an inner flow-blocking surface facing the combustion chamber, and the inner flow-blocking surface is used to gather smoke towards the bottom of the cookware. The upper body, the inner flow-blocking portion, and the upper inner extension portion constitute an inner step structure.

11. The heat insulation cover as described in claim 8, characterized in that, The air inlet is located on the lower body, and the opening area of ​​the air inlet is larger than the opening area of ​​the air outlet.

12. The heat insulation cover as described in claim 8, characterized in that, The upper cover also includes: The upper extension portion is disposed on the side of the upper body away from the combustion chamber and extends towards the lower body, forming an extension space; The lower cover also includes: The lower extension portion is disposed on the side of the lower body away from the combustion chamber and extends into the extension space in a direction close to the upper body. The lower extension portion is partially connected to the upper extension portion.

13. The heat insulation cover as described in claim 12, characterized in that, The upper extension portion includes: The connecting sub-part is connected to the lower extension portion; An epitaxial sub-part is provided at a distance from the lower epitaxial part along the radial direction of the combustion chamber; Wherein, along the radial direction of the combustion chamber, there is a second distance D2 between the outer epitaxial portion and the lower epitaxial portion, wherein D2 satisfies 0.2mm≤D2≤1mm.

14. The heat insulation cover as claimed in claim 1, characterized in that, The heat insulation cover also includes: A partition is disposed within the heat insulation cavity and connects the upper cover and the lower cover. The partition divides the heat insulation cavity into a first cavity and a second cavity. The first cavity is located on the side of the partition facing the upper cover, and the second cavity is located on the side of the partition facing the lower cover.

15. The heat insulation cover as described in claim 14, characterized in that, The separator includes: The main body, together with the upper cover, forms a first cavity; A partition is provided at least on the side of the main body facing the upper cover, the partition dividing the first cavity into multiple partitioned cavities to reduce the flow of air within the first cavity.

16. The heat insulation cover as described in claim 15, characterized in that, Both the surface of the main body and the surface of the partition are provided with a heat insulation layer, which is used to reduce the heat transfer from the first cavity to the second cavity.

17. The heat insulation cover as described in claim 15, characterized in that, Along the axial direction of the combustion chamber, the partition is spaced apart from the top of the main body and the upper cover.

18. The heat insulation cover as described in claim 15, characterized in that, Along the axial direction of the combustion chamber, there is a third gap dimension L3 between the top end of the partition and the upper cover, wherein L3 satisfies: 0.5mm≤L3≤2mm.

19. The heat insulation cover as claimed in claim 14, characterized in that, The heat insulation cover also includes: An insulating filler is placed inside the first cavity to reduce the flow of air within the first cavity.

20. The heat insulation cover as described in any one of claims 1 to 19, characterized in that, Also includes: The upper support leg is connected to the upper cover and is higher than the top swirl member, used to support the pot; as well as The lower support foot is connected to the lower cover and is used to support the lower cover.

21. A gas stove, characterized in that, include: Burner; The heat insulation cover as described in any one of claims 1 to 20 is provided over the burner.

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