Multi-interlayer energy-saving hearth

Abstract

The invention provides a multi-interlayer energy-saving hearth used on a gas stove. In the prior art, a single-layer gas control basin or a welded double-layer gas control basin is used for improving the detection thermal efficiency, but the thermal insulation performance is poor, more heat is lost, and the thermal efficiency is reduced. The multi-interlayer energy-saving hearth comprises an outer hearth and an inner hearth, the outer hearth is in a big-end-up round sleeve shape, the outer hearth is arranged outside a burner of the gas stove in a sleeving mode, the bottom face of the outer hearth is placed on the stove face of the gas stove to be in a closed state, an outer hearth boss is machined on the upper portion of the interior of the outer hearth, and a plurality of outer hearth air inlet holes are evenly distributed in the lower face of the outer hearth along the circumference; the appearance of the inner chamber is in a basin shape with an inner chamber hole in the center, the inner chamber is arranged in the outer chamber, the periphery of the inner chamber is placed on the outer chamber boss, the inner chamber hole is close to the burner and is flanged upwards, and a gap between the inner chamber hole and the burner is used as an outer air supplement port for secondary air; and the pot rack consists of a pot rack ring and a plurality of pot rack legs and is arranged on the upper edge of the outer chamber. Through multi-aspect improvement, the thermal insulation performance and heat recovery are improved, the thermal efficiency is higher than that of various existing gas stoves, and the gas stove is easy to detach and wash.

Description

Technical Field

[0001] The invention relates to an energy-saving furnace with a multi-sandwich structure, which is suitable for household gas stoves. Background Art

[0002] Gas stoves have been around for over 200 years, but their basic structure has remained largely unchanged. They all use atmospheric burners. Gas is injected into the burner through a guide tube, mixed with primary air, and then passed to the ignition distributor on the burner. It is then ejected from the flame hole in the ignition distributor's fire cap, where it mixes with secondary air before burning. Cooking is done with the flame fully exposed to the air. Modern gas stoves have only seen minor improvements in appearance, materials, ignition, and safety, but the basic structure remains unchanged, resulting in lower thermal efficiency.

[0003] The inventors have found through long-term research and development that the main reasons for low thermal efficiency are four aspects:

[0004] 1. Most existing gas stove burners feature two flame rings: an inner and outer ring. These are known as two-ring burners. The outer ring's flame holes project flames diagonally upward, with a diameter of approximately 110-120 mm. This design wastes the heated area of ​​the pot bottom between the inner and outer flames, concentrating the outer flames in a narrow circle. While this burner exhibits high thermal efficiency during flame detection, it exhibits extremely low thermal efficiency when used in a Chinese round-bottomed wok, resulting in poor cooking results.

[0005] The root cause of this phenomenon lies in thermal efficiency testing standards that are out of touch with China's realities. Current national testing standards, based on international standards, use large frying pans with a diameter of over 30 centimeters for testing. Because the flame is ejected close to the pan's bottom, the flame velocity is high, resulting in a higher heat transfer coefficient. Even if some heated area is wasted in the center, it represents a relatively small percentage of the pan's base. Furthermore, while this wasted area is in the center, it effectively reduces the heat intensity to the lowest area of ​​the pan's base. Therefore, it has little impact on overall thermal efficiency, resulting in a higher measured thermal efficiency value.

[0006] Most household pots, however, are small, just over 20 centimeters in diameter. This is especially true in China, where electrical appliances are often used for boiling water and cooking, while gas stoves are primarily used for stir-frying. Households typically cook smaller portions; a typical large bowl of food, weighing approximately 500 grams, occupies only about 20 centimeters of the pot's diameter. The broth, even smaller, is concentrated in the center of the pot. Because the round bottom curves upward, the outer flames projecting diagonally upwards from the outer ring have a contact diameter of approximately 150 centimeters at the pot's base. This effectively burns only the edges of the dish, ignoring the broth, leaving only the center, which is a low flame. This significantly reduces thermal efficiency. During cooking, the edges of the dish often burn while the broth in the center remains unboiled. This necessitates repeated opening and stirring, which not only causes significant heat loss but also prolongs cooking time, wastes gas, and is extremely difficult to cook.

[0007] There are also spiral stoves on the market, where the outer flame is ejected tangentially along the circumference. Increasing the tangential flame velocity is useless; only increasing the normal flame velocity and thinning the flame layer can improve the heat transfer coefficient and thus thermal efficiency. Therefore, while the heat is concentrated in the center, the flame is weak, the normal flame velocity is low, and the thermal efficiency is also low. Nine-burner stoves, which have been released in recent years, also have dispersed flames. While these two stoves are not very efficient in practical cooking, they offer more evenly distributed heat than two-ring stoves, making cooking easier.

[0008] There are also infrared stoves that are modified to mix the air only once to improve thermal efficiency, but in fact it is unreasonable. In addition, there are major defects such as fine fire holes, inability to clean after clogging, and short lifespan, so they have been basically eliminated.

[0009] 2. Every time a gas stove starts cooking, it wastes some heat to heat the burner, stovetop, and other components. This is called thermal inertia. The heavier the burner, the greater the thermal inertia, and the more heat is wasted. Current burners are made of brass (previously, they were cast iron, which is prone to rust). For example, a 300-gram burner, heated to a constant temperature of approximately 300°C, consumes roughly the same amount of heat as boiling 80 grams of water. For a household gas stove that only takes a few minutes to cook a single bowl of food, using about 500 grams of water, this represents a significant amount of waste. Therefore, the lower the thermal inertia, the better.

[0010] Current national standards don't measure thermal inertia or the thermal efficiency of round-bottomed woks. However, manufacturers should strive to produce gas stoves with low thermal inertia and high thermal efficiency using round-bottomed woks to truly contribute to energy conservation and emissions reduction. Our own rough test method uses the same round-bottomed iron pan, starting from cold, to boil 500g or 1000g of water at room temperature. We compare the time and gas consumption of each stove, providing a rough comparison of the actual thermal efficiency of various gas stoves.

[0011] 3. The flame burns when exposed to the air, and loses a lot of heat due to contact and mixing with too much air outside.

[0012] 4. About 30% of the flame's heat is radiated by infrared rays, most of which is wasted when radiated downward and outward.

[0013] In 1997, the inventors discovered the aforementioned flaws (1) and (2) while using a two-ring burner stove. They subsequently developed a straight-burner gas stove with a thin-walled stainless steel cover weighing only approximately 80 grams. Stainless steel has poor thermal conductivity, resulting in minimal heat loss to the burner head. This reduces thermal inertia and allows for concentrated, upward-focused fire. While the straight-burner head's distance from the pot bottom and its exposure to cold air makes it slightly less efficient than a two-ring burner stove, its practical performance when used with a frying pan was significantly better than that of a conventional stove. At the time, a satisfactory thermal efficiency was sufficient, making it a popular choice among users.

[0014] Gas stove energy efficiency ratings began to be standardized in 2015, with the national standard for built-in Class 1 energy-efficiency stoves setting a thermal efficiency of 63%. This is because the 1996 edition of the national standard for household gas stoves included an unreasonable stipulation regarding thermal efficiency testing: "…the initial water temperature should be room temperature plus 5°C, and the final water temperature should be the initial water temperature plus 50°C..." This "room temperature plus 5°C" preheats the stove for several minutes, masking the shortcomings of the high thermal inertia stove cover. The 2007 edition added an even more unreasonable stipulation: "…when the temperature rises 30K above the initial temperature, turn off the gas and continue stirring. The highest temperature reached is the final temperature..." This practice allows the stove with high thermal inertia to continue transferring heat to the pot even after it is turned off, further inflating the measured thermal efficiency. The 2020 version restored the 1996 method, but added a 15-minute preheating step, making it virtually indistinguishable between cooktops with different thermal inertias. (Actually, it would have been more reasonable to use an additional electric heater or ice pack to bring the water to room temperature and then test immediately after ignition. However, because the water volume tested was so large, the difference in thermal inertia values ​​was minimal.) Knowing that their product's energy efficiency rating was low and unable to compete, they proactively discontinued production of the product.

[0015] In 2021, the inventors further realized the third and fourth reasons for the low thermal efficiency of the above-mentioned gas stoves, and developed a "gas stove insulation furnace", with a patent application number of 2021 2 1082865.9. The flame is placed in the insulation furnace to burn, firstly, to control the secondary combustion air, prevent too much cold air from contacting the flame, and allow part of the hot exhaust gas attached to the periphery of the flame to circulate in the furnace. Secondly, infrared radiation is made on the inner wall of the furnace to increase the furnace temperature, thereby reducing heat loss, and improving the use of thin-walled stainless steel fire covers with low thermal inertia for both the inner and outer fire covers. Due to manufacturing difficulties, the official trial product was not launched until the end of 2023, and the thermal efficiency was increased to 74%. However, due to the installation of aluminum silicate insulation cotton in the insulation furnace, the large size and clumsy appearance, coupled with some other defects, the market recognition is not high.

[0016] Therefore, in May 2024, the inventor changed the design to a gas stove with gas control only and no heat preservation. The patent is named "Gas stove with gas control pot rack" and the patent application number is 202421212615.6. Although the thermal efficiency is reduced to 69%, it is still much higher than the original 63% first-level energy efficiency. It also has good practical performance and user-acceptable appearance. However, there are some drawbacks: the stainless steel burner is difficult to remove and clean, and the interior of the gas control pot rack is also difficult to clean, and it will yellow and discolor over time.

[0017] As a result, some existing household gas stoves have gradually adopted the gas control principle and improved their design to increase the detected thermal efficiency, raising the nominal detected thermal efficiency to over 68%. However, to achieve this, the diameter of the gas control basin is made larger, resulting in a large gap between the edge of the basin and the round-bottomed wok, making the basin virtually useless when using the wok. In other words, the current gas control basin is merely a selling point to improve the detected thermal efficiency, with little practical value.

[0018] See Figure 1 , Figure 1 The diagram shows the operation and structure of an existing gas stove equipped with a gas control basin, with a large frying pan and a cooking pot placed on them respectively. Figure 1 In the figure, 1 is the gas stove part, 1-1 is the gas stove surface, 1-2 is the burner, 1-3 is the pressure plate, 1-4 is the gas control basin, 1-4-1 is the gas control basin support. The pot rack 1-5 is detachably placed on the gas control basin 1-4. Figure 1 The left side of the diagram illustrates the placement of a large frying pan 2. The exhaust gas outlet, located at the height a of the pan stand foot 1-5-1, is only approximately 9-10 mm. The outflowing exhaust gas equals the total of the incoming internal and external combustion gases, internal and external primary air, and internal and external secondary air. The high-temperature, viscous exhaust gas that flows along with the exhaust gas is blocked and forced to circulate only in the gas control basin, raising the temperature inside the basin and reducing heat dissipation from the flame, thereby improving thermal efficiency.

[0019] Turning to the right, a diagram illustrates the placement of a round-bottomed pot 3. The distance a1 between the pot bottom and the edges of the gas control basins 1-4 is large, allowing a large amount of cold air to flow in from the edges of the gas control basins. The viscous exhaust gas, heated by the flame airflow, flows out along with the combustion exhaust gas, carrying away the heat. Therefore, when the round-bottomed pot 3 is in use, the gas control basins 1-4 are essentially ineffective. Summary of the Invention

[0020] Based on the above background technology, the applicant believes that the gas control basin of the existing gas stove can be further improved. The purpose of the present invention is to create a multi-layer energy-saving furnace that further improves the thermal efficiency of the gas stove and is easy to disassemble and assemble.

[0021] In accordance with the above objectives, the present invention provides a multi-layered energy-saving furnace for use on a gas stove, comprising:

[0022] The outer chamber is in the shape of a circular sleeve with a larger upper portion and a smaller lower portion, and is placed outside the burner of the gas stove. Its bottom surface is placed on the cooktop of the gas stove in a closed state. An outer chamber boss is processed on the upper portion of the inner chamber, and a plurality of outer chamber air inlet holes are evenly distributed along the circumference of the lower portion.

[0023] The inner chamber is in the shape of a basin with an inner bore in the center, and is disposed in the outer chamber, with its periphery resting on the outer chamber boss. The inner bore is close to the burner and is turned up, with the gap between the inner bore and the burner serving as an external air supply port for secondary air; and

[0024] The pot rack is composed of a pot rack ring and a plurality of pot rack feet and is arranged on the upper side of the outer chamber.

[0025] In the multi-layer energy-saving furnace as described above, the outer chamber boss is processed into a plurality of convex points for placing the inner chamber.

[0026] As described above, the multi-layered energy-saving furnace has an outer chamber bottom and an inward-facing outer chamber flat bottom, below which a silicone ring is pasted to insulate and seal the stove surface.

[0027] The multi-layer energy-saving furnace chamber as described above also includes a lower aluminum foil basin, which is arranged below the inner chamber in the outer chamber, and its edge rests on the outer chamber boss below the inner chamber, dividing the space between the inner chamber and the outer chamber into two parts, an inner and an outer part, and the middle part is made into a cylindrical shape and extends downward to the aluminum foil foot fixed on the flat bottom of the outer chamber, forming an air intake gap of a certain height between the gas stove surface.

[0028] The multi-layer energy-saving furnace as described above also includes an upper aluminum foil basin, which is close to the concave surface of the inner chamber, goes up along the wall to the inner wall of the outer chamber, and then turns outward and downward to be placed at the edge of the outer chamber, and then the pot rack is placed on it.

[0029] In the multi-layer energy-saving furnace as described above, the outer diameter of the pot rack ring of the pot rack is smaller than the inner diameter of the upper opening of the outer chamber, and the pot rack feet extend out of the pot rack ring and rest on the upper edge of the outer chamber and press the edge of the upper aluminum foil basin.

[0030] As described above, in the multi-layer energy-saving furnace, the outermost section of the pot rack foot is processed into a horizontal surface, and the inner portion is tilted downward at a small angle, and the upper inclined plane is processed into a pointed surface.

[0031] In the multi-layered energy-saving furnace chamber as described above, the corners of the inner chamber and the bottom surface of the upper aluminum foil basin are processed into arc-shaped transitions.

[0032] In the multi-layer energy-saving furnace as described above, the difference between the outlet angle of the flanged hole edge of the inner chamber and the angle of flame flow is less than 20 degrees.

[0033] In the multi-layer energy-saving furnace as described above, the edge of the inner chamber flange hole is higher than the fire hole outlet by more than 5 mm.

[0034] The multi-layer energy-saving furnace as described above also includes a positioning air intake sleeve, which is arranged under the inner bore hole and is sleeved outside the burner below to accurately and concentrically position and seal the air. The gap between the upper surface of the gasket and the inner bore is adjusted by adjusting the thickness of the gasket, thereby adjusting the air intake volume.

[0035] As described above, the multi-layered energy-saving furnace has a hole in the middle of the inner chamber without any flanges, and also includes a fire cover ring with a hole with an arc edge, which is connected to the positioning air intake sleeve as a whole.

[0036] The multi-layer energy-saving furnace chamber as described above, wherein the inner chamber is made of aluminum alloy plates and polished to the natural color of aluminum metal.

[0037] As described above, the present invention has been improved in many aspects to enhance the thermal insulation performance and heat recovery. Its thermal efficiency is definitely higher than that of various existing gas stoves, and it is easy to disassemble and clean. Please see the principle analysis in the embodiment for details. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0039] Figure 1 The utility model is a side cross-sectional schematic diagram of a gas stove equipped with a single-layer gas control basin on the market.

[0040] Figure 2 It is a side cross-sectional schematic diagram of another type of gas stove on the market that is equipped with a double-layer gas control basin.

[0041] Figure 3 It is a schematic diagram of the present invention installed on a general stove.

[0042] Figure 4 This is a schematic diagram of the present invention being applied to the device of "a high-efficiency gas stove burner fire cover" (which has been applied for separately). DETAILED DESCRIPTION

[0043] Figure 2 The structure of gas stove Figure 1 The two-layer structure is basically the same, except that the air control basin 4 adopts a double-layer structure with the inner and outer edges of the inner basin 4-3 and the outer basin 4-4 welded together, and the support legs 4-1 and the pot legs 4-2 are welded together. The double-layer structure is undoubtedly better than Figure 1 The single-layer structure has a small improvement, mainly because: first, a lot of heat is transferred from the inner basin 4-3 to the outer basin 4-4 at the welding point between the inner and outer basins; second, when the temperature is high, the heat transfer by thermal radiation is much greater than the heat transfer by air convection, and the internal stainless steel plate has a high radiation rate and absorptivity after high-temperature oxidation and blackening, so a lot of heat is transferred by thermal radiation; third, in a single-layer space, the heat transfer by air convection is also large.

[0044] See Figure 3 , Figure 3 A schematic diagram showing the multi-layer energy-saving furnace device of the present invention on a general stove is shown.

[0045] Figure 3The center portion 5 is the outer chamber, which is shaped like a circular sleeve with a larger top and smaller bottom. It fits over the burner 1-2. The bottom of the outer chamber 5 rests on the stovetop 1-1 and is closed. The upper portion of the outer chamber 5 is machined with an outer chamber boss 5-1, and the lower portion is provided with a plurality of outer chamber air inlet holes 5-2 evenly distributed along the circumference.

[0046] Figure 3 The inner chamber 6 is a basin-shaped chamber with an inner bore 6-1. The inner chamber 6 is located within the outer chamber 5, with its perimeter resting on the outer chamber boss 5-1. The inner bore 6-1 is positioned adjacent to the burner 1-2 and is turned upward, forming a gap b between the two, which serves as an external intake for secondary air.

[0047] Figure 3 The middle 7 is a pot rack, which is composed of a pot rack ring 7-1 and a plurality of pot rack feet 7-2 and is arranged on the outer chamber 5.

[0048] The surface of the outer chamber boss 5-1 can be processed into a plurality of convex points to reduce heat transfer to the outer chamber.

[0049] The outer chamber also has an inward-facing flat bottom 5-3, which transfers the heat from the outer chamber 5 to the bottom, increasing heat dissipation and facilitating heat recovery. A silicone pad 8 is attached below it, providing insulation and airtightness from the stovetop 1-1. Unlike conventional gas stoves, which receive cold external air as secondary air, this structure draws in cold air through the outer chamber air inlet 5-2. This air then mixes with hot air during convection heat transfer between the inner and outer chambers before entering the burner, partially recovering heat and improving thermal efficiency.

[0050] In the present invention, a lower aluminum foil basin 9 can also be added, and its edge also rests below the inner bore 6 on the outer bore boss 5-1. The aluminum foil basin 9 divides the gap between the inner bore 6 and the outer bore 5 into two parts, the inner and outer parts. The middle part is made into a cylindrical shape and extends downward to the aluminum foil foot 5-4 fixed on the flat bottom 5-3 of the outer bore, forming an air intake gap c of a certain height. Its advantages are: First, the aluminum foil has a reflectivity of more than 85% for infrared rays, and only absorbs less than 15% of heat. After heating, its radiation rate to the outer bore is only 15%, which greatly reduces the thermal radiation heat transfer between the inner and outer bores. Second, after being divided into two spaces, the convective heat transfer will also be reduced. Third, the air temperature in the inner space is high, which is more conducive to increasing the heat recovery of the secondary air, so the thermal efficiency can be greatly improved.

[0051] In the present invention, an upper aluminum foil basin 10 can also be added, positioned adjacent to the concave surface of the inner chamber 5. Its outer edge extends along the inner wall of the outer chamber 5, then curves upward along the wall to the upper edge, then outward and downward, allowing the wok rack 7 to rest on top. The upper aluminum foil basin 10 serves the following functions: 1. It heats quickly, instantly reflecting infrared light to heat the pot bottom upon ignition. It is also lightweight, and only slightly contacts the inner chamber 6, creating a high thermal resistance. High-temperature, viscous exhaust gases within the chamber quickly heat the pot to a high temperature, thus maintaining the pot's internal temperature. This eliminates the need to wait for the inner chamber 6 to heat up to a high temperature, thus enhancing the pot's actual firepower. 2. It protects the inner wall of the inner chamber 6, which typically reaches temperatures exceeding 100°C under infrared radiation. If spilled, soup becomes difficult to clean after drying out, and wiping with steel wool can damage the inner surface. The aluminum foil remains discolored even after long-term use; if spilled, it can be replaced with a new one.

[0052] In addition, the outer diameter of the pot rack ring 7-1 of the pot rack 7 is smaller than the inner diameter of the upper opening of the outer chamber 5, and the pot foot 7-2 extends out of the pot rack ring and rests on the flange of the upper aluminum foil basin 10 at the upper edge of the outer chamber 5. In this way, the pot rack ring 7-1 has aluminum foil to block radiant heat transfer, and only four points of the pot foot 7-2 contact the outer chamber, reducing contact heat transfer and heat dissipation to the outer chamber 5, so that the temperature of the pot rack ring 7-1 is higher.

[0053] The outermost length of the pot foot 7-2 is processed into a horizontal surface, and the inner part is tilted downward at a small angle, and the upper inclined plane is processed into a sharp angle surface. Figure 3 Middle AA cross-section. This is primarily because modern gas stoves use both a flat-bottomed stove and a frying pan, and the pan legs are designed to be horizontal. However, large frying pans typically have a slightly raised center bottom surface. This means only the center legs contact the bottom, while the outer legs block the bottom, reducing the bottom's heated area. Furthermore, the outer legs are cooler, preventing heat from transferring to the center legs. With the improved pan legs of the present invention, the center heat still reaches the bottom, while the flat surfaces of the four outermost legs contact the bottom, creating the lowest temperature point on the pan support. Heat from the legs and pan support ring transfers to this point, effectively increasing the bottom's heated area and improving thermal efficiency. This principle is demonstrated by boiling water in a large frying pan, where the water can be clearly seen boiling at the ends of the four legs.

[0054] like Figure 1 As shown in , the velocity of the viscous exhaust gas within the chamber is driven by the flame speed. In the present invention, the corners of the inner chamber 6 and the bottom surface of the upper aluminum foil basin 10 are processed into arc-shaped transitions, which can reduce the velocity loss of the circulating airflow within the chamber. Furthermore, when the difference between the outlet angle of the flanged hole of the inner chamber and the flow angle of the flame is less than 20 degrees, the circulating airflow flows to the center and then returns to the periphery of the flame. The difference in velocity and angle between the two is small, which reduces the velocity loss of the flame and the amount of mixing between the two, thereby reducing the heat loss of the flame, thereby improving thermal efficiency.

[0055] See also Figure 4 , Figure 4 A schematic diagram showing the multi-layered energy-saving furnace of the present invention being applied to a "high-efficiency gas stove burner fire cover" (which has been applied for separately). Figure 4 In the figure, 11 is the flame distribution plate of the gas stove, 11-1 is the external gas outlet, 11-2 is the internal gas outlet, 11-3 is the internal air inlet channel, 11-4 is the internal air inlet channel, 12 is the internal flame cover, installed on the internal gas outlet 11-2, and 13 is the external flame cover, which is designed with multiple high-protruding flame holes to increase flame speed and is installed on the external gas outlet 11-1. The flame is concentrated at the center of the pot bottom, with high flame speed and high thermal efficiency, making it particularly suitable for Chinese round-bottomed woks.

[0056] The inner chamber is changed into 6A, wherein only perforation is not flanged in the middle. Perforation edge 6A-1 is near the outer diameter of outer fire cover 13. Below, inner chamber positioning air inlet sleeve 6A-2 is installed. It is enclosed in the peripheral accurate concentric positioning and air sealing of fire distribution plate 11 below. By adjusting the gap between it and the inner chamber 6A, the thickness of gasket 6A-3 just can regulate the air intake. Like this, the aperture or the number of holes of outer chamber air inlet hole 5-2 can be changed to control the total air intake. The thickness of gasket 6A-3 is controlled to control the inside and outside air intake ratio, and fixed after testing the optimal size. In addition, an inner chamber fire cover ring 6A-4 that is turned into a circular arc side hole is added, and then three pieces of positioning air inlet sleeve 6A-2 are connected into one. Mainly, inner chamber 6A can be made of aluminum alloy plate or thin steel plate to reduce weight and help rapid heating. The aluminum alloy plate can be polished into the original color of aluminum metal, which can further reduce the radiant heat transfer to the outer chamber. The flame cover ring 6A-1 is close to the flame and has a high temperature. It and the positioning air inlet sleeve 6A-2 are both made of thicker steel plates to prevent deformation. The opening 6A-1 of the inner chamber 6A is also smaller and closer to the edge of the flame cover. This prevents the surrounding secondary air from flowing out of the flame along the curved flange. Instead, it flows inward through the gap in the high boss, mixing more thoroughly with the flame. The inward velocity also promotes flame cohesion, improving the thermal efficiency of the round-bottomed wok.

[0057] The flanged edge of the inner bore 6-1 or the fire cover ring 6A-4 mentioned above is made to be higher than the fire hole outlet d by more than 5 mm, mainly to give priority to allowing the fresh oxygen-rich air mixed with the fuel gas supplied from the surrounding bottom to be fully burned, and to prevent the oxygen-poor viscous exhaust gas in the bore from entering the flame, reducing the flame temperature and thus reducing the thermal efficiency.

Claims

1. A multi-layer energy-saving furnace, used on a gas stove, characterized in that: include: The outer chamber is in the shape of a circular sleeve with a larger upper portion and a smaller lower portion, and is placed outside the burner of the gas stove. Its bottom surface is placed on the cooktop of the gas stove in a closed state. An outer chamber boss is processed on the upper portion of the inner chamber, and a plurality of outer chamber air inlet holes are evenly distributed along the circumference of the lower portion. The inner chamber is in the shape of a basin with an inner bore in the center, and is arranged in the outer chamber, with the periphery resting on the outer chamber boss. The inner bore is close to the burner and is turned up, and the gap between the inner bore and the burner serves as an external air supply port for secondary air. as well as The pot rack is composed of a pot rack ring and a plurality of pot rack feet and is arranged on the upper side of the outer chamber.

2. The multi-layer energy-saving furnace according to claim 1, characterized in that The outer bore boss is processed into a plurality of convex points for placing the inner bore.

3. The multi-layer energy-saving furnace according to claim 1, characterized in that The bottom of the outer chamber is also provided with an inward outer chamber flat bottom, under which a silicone ring is pasted to insulate and seal the stove surface.

4. The multi-layer energy-saving furnace according to claim 1, characterized in that It also includes a lower aluminum foil basin, which is arranged below the inner chamber in the outer chamber, and its edge rests on the outer chamber boss below the inner chamber, dividing the space between the inner chamber and the outer chamber into two parts, the middle part is made into a cylindrical shape and extends downward to the aluminum foil foot fixed on the flat bottom of the outer chamber, forming an air intake gap of a certain height.

5. The multi-layer energy-saving furnace according to claim 4, characterized in that It also includes an upper aluminum foil basin, which is close to the concave surface of the inner chamber, goes up along the wall to the inner wall of the outer chamber, and then turns outward and downward to be placed at the edge of the outer chamber, and then the pot rack is placed on it.

6. The multi-layer energy-saving furnace according to claim 5, characterized in that The outer diameter of the pot rack ring of the pot rack is smaller than the inner diameter of the upper opening of the outer chamber, and the pot rack feet extend out of the pot rack ring and rest on the upper edge of the outer chamber and press the edge of the upper aluminum foil basin.

7. The multi-layer energy-saving furnace according to claim 5, characterized in that The outermost section of the pot rack foot is processed into a horizontal surface, and the inner portion is tilted downward at a small angle, and the upper inclined plane is processed into a pointed angle surface.

8. The multi-layer energy-saving furnace according to claim 5, characterized in that The corners of the inner chamber and the bottom surface of the upper aluminum foil basin are processed into arc-shaped transitions.

9. The multi-layer energy-saving furnace according to claim 5, characterized in that The difference between the outlet angle of the flanged hole edge of the inner chamber and the angle of flame flow is less than 20 degrees.

10. The multi-layer energy-saving furnace according to claim 5, characterized in that The edge of the inner chamber flange hole is higher than the fire hole outlet by more than 5 mm.

11. The multi-layer energy-saving furnace according to claim 10, characterized in that It also includes a positioning air intake sleeve, which is arranged below the inner bore hole and is placed outside the burner below to accurately position and seal the air. The gap between the upper surface of the gasket and the inner bore is adjusted by adjusting the thickness of the gasket, thereby adjusting the air intake volume.

12. The multi-layer energy-saving furnace according to claim 11, characterized in that The middle of the inner chamber is only opened without flanges, and also includes a fire cover ring with a circular arc edge hole, which is connected to the positioning air intake sleeve and the other three parts into one.

13. The multi-layer energy-saving furnace according to claim 5, characterized in that The inner chamber is made of an aluminum alloy plate and polished to the natural color of aluminum metal.

Images