Infrared energy-saving cover and gas appliance

Abstract

The invention discloses an infrared energy-saving cover and a gas appliance, and aims to overcome the defects that in the prior art, the gas appliance is low in gas combustion efficiency, and meanwhile heat is prone to loss. The technical problem is solved through the following technical scheme that the infrared generator comprises an infrared generating cover and a heat preservation and heat insulation cover arranged on the outer side of the infrared generating cover; an air preheating cavity is formed between the heat preservation and heat insulation cover and the infrared generation cover; the air preheating cavity is provided with an air inlet channel communicated with outside air, and a plurality of air outlets are formed in the infrared generation cover in a penetrating mode. Air enters from the air inlet channel, passes through the air preheating cavity and then flows out from the air outlet. Air flows in from the bottom of the air preheating cavity and is heated when passing through the air preheating cavity, and the heated air is sprayed out from the air outlet and is subjected to high-temperature secondary combustion with fuel gas. And in the combustion-supporting environment of high-temperature air heated by the air preheating cavity, the combustible gas can be secondarily combusted and consumed completely, and harmful gas and black pot are prevented from being formed.

Description

Technical Field

[0001] The invention relates to the technical field of civil stoves, and more specifically to an infrared energy-saving cover and a gas cooker. Background Art

[0002] Existing gas appliances are divided into two types: fully premixed and partially premixed.

[0003] Completely premixed infrared gas appliances have gradually gained attention due to their advantages of complete combustion, less pollution, and high thermal efficiency. However, since the combustion reaction occurs in ceramic micropores or metal sheet gaps, it has high material requirements and high process costs; it also has disadvantages such as flashback when the gas pressure is unstable and a short service life. These disadvantages have led to poor promotion effects.

[0004] Partial premix gas appliances are the mainstream gas appliances at present. They rely on the flame of gas combustion to heat the pot, and the flame forms a wrapping convection heat transfer on the pot, which is called an atmospheric gas appliance. Because of its partial premixing characteristics, it has the advantages of low cost, mature technology, and no flashback. However, when cooking food, the pot itself is at a low temperature due to the heat absorption of the food, which easily reduces the flame temperature, and then causes incomplete combustion on the bottom surface of the pot, forming harmful gases and causing carbon black precipitation, commonly known as black pot. At the same time, the lower part of the flame is exposed to the air, causing a large amount of heat energy to diffuse into the surrounding air, reducing thermal efficiency.

[0005] Therefore, whether it is possible to avoid the shortcomings of existing fully premixed gas appliances, absorb the advantages of partially premixed gas appliances, and improve the combustion efficiency of gas is a direction that people have been working hard to explore.

[0006] The Chinese patent publication number is CN201420004301, and the publication date is July 9, 2014. The name of the invention is a furnace inner wall for an energy-gathering stove. The application can effectively absorb waste heat and reflect heat energy by setting a heat conductor and an energy-gathering body. Although the above method can reduce heat loss and improve heat utilization efficiency, it cannot fundamentally improve the combustion efficiency of gas. Summary of the invention

[0007] The present invention overcomes the shortcomings of low efficiency and easy heat loss of gas burning in gas appliances in the prior art, and provides an infrared energy-saving cover, which can preheat the air participating in the secondary combustion in the air preheating chamber. Under the induced effect of the primary combustion flame airflow, the preheated air flows through widely distributed air outlets, so that the secondary high-temperature combustion is generated along the heated appliance and close to the bottom of the heated appliance, thereby expanding the heating area. The high temperature of the chemical reaction directly forms more thermal convection impacts on the heated appliance; the secondary combustion products are completely burned under the impact of high-temperature air, achieving flameless combustion. The uniform and violent secondary combustion reaction releases higher energy and emits infrared rays. The thermal convection caused by the combustion reaction of the hot air induced by the air outlet and the high-speed gas mixture cooperates with infrared radiation to improve the thermal efficiency. In this high-temperature infrared radiation environment, the gas that is not completely burned out is fully burned, and the gas cooled by the bottom of the pot is re-ignited, which improves the combustion efficiency of the gas and avoids the formation of harmful gases and black pots.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions: an infrared energy-saving cover, comprising: an infrared generating cover, a thermal insulation cover arranged on the outside of the infrared generating cover; an air preheating chamber is arranged between the thermal insulation cover and the infrared generating cover; the air preheating chamber is provided with an air intake channel connected to the outside air, and a plurality of air outlets are arranged through the infrared generating cover; air enters from the air intake channel, passes through the air preheating chamber, and flows out from the air outlet.

[0009] The actual use process of the infrared energy-saving cover of the present invention is as follows: remove the original gas stove bracket, place the infrared energy-saving cover in the present application at the original gas stove bracket position, place the pot, and use it after ignition. In the initial stage, the flame of the original gas stove remains blue and gradually impacts the cavity shell of the air preheating cavity. During this process, the air outlet of the air preheating cavity begins to flow out air under the induced effect of the gas flame. At this time, the air enters from the outer side of the lower part of the infrared energy-saving cover of the present application, and enters the air intake channel after initially absorbing the heat on the gas stove panel and the lower part of the energy-saving cover; further absorbs the heat of the stove head and the stove panel, enters the hollow structure of the air preheating cavity, and flows out from the air outlet after absorbing the heat of the cavity shell of the air preheating cavity. As the temperature of the infrared generating cover gradually rises, the temperature of the preheated air rises, and the air preheating cavity has been started. After about 40 seconds, the surface of the infrared generating cover close to the combustion surface begins to turn red, and after two minutes, the cavity shells of all infrared generating covers turn red. At this time, the flame from the small fire port at the bottom of the gas stove is still blue, and the lower part of the flame from the large fire cover is blue. The upper part becomes red mist flame gas after entering the energy-saving cover. After reaching the middle and upper part of the infrared energy-saving cover, the flame cannot be seen. The overall infrared energy-saving cover is in a red transparent radiation environment, and the working medium of the pot is obviously heated at this time. After 4 minutes, the infrared energy-saving cover enters a stable working state. Due to the thick insulation part, the temperature of the outer side of the lower part of the infrared energy-saving cover and the environment is not much different after 10 minutes of startup. The temperature of the outer side of the lower part will still rise after half an hour of startup, and then remain stable. When the gas stove switch knob is turned down, the infrared radiation environment gradually darkens as the flame becomes smaller, and the infrared radiation area also moves down until the infrared radiation disappears after the small fire. Due to the use of the thermal insulation cover, the infrared energy-saving cover plays a role in windproof and heat maintenance. At this time, after adjusting from the small fire state to a larger one, because the residual temperature is still there, the infrared radiation quickly restarts. When the pot is removed, the flame of the gas stove goes up and no longer flows through the infrared radiation area, and the infrared radiation disappears quickly; shortly after it is removed, it is moved back and the infrared radiation restarts within a few seconds. This process is in line with the public's habit of operating a gas stove for cooking. After testing, there is no incomplete combustion in the initial stage and the restart stage.

[0010] The air preheating chamber is a hollow structure, and the air intake channel is set at the bottom of the air preheating chamber. The air flows in from the bottom of the air preheating chamber, and when passing through the air preheating chamber, the air is heated. The heated air is ejected from the air outlet and undergoes high-temperature secondary combustion with the gas. The high temperature generated by the secondary combustion is dispersed along the bottom of the heated utensils. The high temperature generated by the chemical reaction of the secondary combustion directly forms more thermal convection impacts on the heated utensils (pots), so that the secondary combustion products are completely burned under the impact of high-temperature air, achieving flameless combustion. Uniform and intense combustion releases higher energy and emits infrared rays. The combustion reaction of the hot air ejected from the air outlet and the high-speed gas mixture induces thermal convection, and the thermal efficiency is improved by infrared radiation. In this high-temperature infrared radiation environment, the gas that is not completely burned is fully burned, and the gas cooled by the bottom of the pot re-ignites. In the high-temperature air combustion environment heated by the air preheating chamber, the combustible gas can be consumed to avoid the formation of harmful gases and black pots.

[0011] Preferably, a plurality of layered plates distributed along the thickness direction are arranged in the air preheating chamber, and the plurality of layered plates divide the air preheating chamber into a plurality of separated chambers along the thickness direction; two ends of adjacent separated chambers are respectively connected in an interlaced manner to form a curved channel.

[0012] The multi-layer partition cavity forms a layered space in the air preheating cavity. The layered space of the air preheating cavity belongs to the flow space of the secondary air. The air flowing through it will eventually flow out from the air outlet to participate in the secondary combustion. The shape of the layered space is close to the infrared generator cover, making it easier for the secondary air to get close to the infrared generator cover, thereby completing heat exchange with the infrared generator cover, which is more conducive to the preheating of the secondary air. The cross-section of the curved channel flow is larger than the corresponding total cross-section of the air outlet to ensure the orderly flow of the secondary air. At the same time, the larger curved channel and smaller air outlet setting can increase the air flow rate of the air outlet, which is conducive to the secondary combustion reaction.

[0013] The infrared generating area is the area of ​​the infrared generating cover close to the bottom of the pot. The air preheating chamber is the preheating area before the preheated air enters the infrared generating area. It is relatively close to the infrared generating area and has a higher temperature. When the air intake cross-section of the layered space is larger than the corresponding total air outlet cross-section (the Venturi effect is more obvious when it is 6-10 times larger), the partition cavity is thinner and uniform. The high temperature radiation of the infrared generating cover is more evenly distributed in the layered space, and its temperature gradient is not greatly reduced. The heat absorption effect on the infrared generating cover is limited, which can promote the generation and maintenance of infrared rays. When the partition cavity is thinner, it is closer to the infrared generating area, and it is easier to maintain high temperature, so that the temperature of the preheated air is higher. At the same time, when it is used specifically, the layered plate is also set to a thinner thickness, and the specific thickness is between 0.3 mm and 1.2 mm, preferably 0.8 mm.

[0014] Preferably, a plurality of chamber partition plates are arranged in the partition chamber near the infrared generating cover, and the plurality of chamber partition plates are arranged in the vertical direction of the side wall of the partition chamber, and the chamber partition plates divide the partition chamber into small air intake chambers; an air intake hole is provided at one end of each small air intake chamber, and the other end is connected to at least one air outlet.

[0015] The functions of the dividing layer of the chamber partition plate are as follows: first, the cavity wall of the divided small air intake chamber can act as an insulating cavity to reduce the heat conduction to the outside; second, it extends the flow path of the preheated air, increases the preheating time, and increases the temperature of the preheated air; third, the size of the air outlet of each small air intake chamber can be arranged so that the preheated air flows in an orderly manner and is reasonably distributed (each small air intake chamber corresponds to a circle of air outlets. If the position of this circle happens to need to supplement more preheated air, the corresponding air outlet will be expanded, otherwise it will be reduced); fourth, when the external wind blows towards the air outlet, it can reduce the flow and backflow of preheated air caused by external wind and other factors; fifth, the added chamber partition plates and layered plates can increase the inner surface area of ​​the air preheating cavity, so that the preheated air has more opportunities to contact and collide with the inner wall of the air preheating cavity, making it easier to complete heat exchange and better complete air preheating. Viewed from the direction of the normal line of the chamber partition wall, the greater the inclination angle of the inclined chamber partition and the stepped chamber partition and the more steps there are, the more small air intake chambers the normal line passes through, the better the thermal insulation effect is, and the higher the preheated air temperature is.

[0016] Preferably, the side wall of the infrared generating cover is provided with a plurality of protrusions, and the air outlets are arranged on the protrusions.

[0017] The convex heads are distributed on the inner side of the infrared generator cover, forming an undulating concave and convex surface on the surface of the infrared generator cover. This increases the reflection area of ​​the infrared generator cover surface, and increases the chances of the cookware receiving secondary rebound radiation; it also makes the air outlet collide with the gas flame, making the mixing more uniform, the turbulence more intense, and the secondary combustion of the gas more complete.

[0018] Preferably, an air nozzle is provided at the air outlet, and the air nozzle is a tubular structure.

[0019] When the tubular air nozzle structure extends into the air preheating chamber, the air outlet of the infrared generating area is wrapped in the high-temperature gas mixture. After the high-temperature air at the air outlet is ejected, the air outlet reacts violently and turns to infrared first, which can promote the temperature rise of the preheated air and has a stronger gas digestion ability. At the same time, the space between the tubular air nozzle structures becomes a channel for the gas mixture to be discharged upward, and this channel also provides space for the preheating of the tubular air nozzle structure. The area of ​​the secondary combustion reaction moves upward due to the extension of the tubular air nozzle structure, which is closer to the bottom of the heated appliance and improves the thermal efficiency. The above layout avoids the situation that some existing energy-saving covers are too far away from the bottom of the heated appliance in order to ensure smooth discharge of the gas mixture, resulting in low heating efficiency. At the same time, the extension of the tubular air nozzle structure leaves a channel for the discharge of smoke; it avoids the situation that some existing energy-saving covers are too close to the bottom of the pot in order to improve thermal efficiency, resulting in narrow smoke discharge space and insufficient combustion reaction, which in turn causes safety accidents.

[0020] Preferably, the infrared generating cover and the air preheating chamber are both annular structures.

[0021] The infrared generator cover is an annular structure, which includes a strictly circular ring structure, and also includes a triangular ring or polygonal ring surrounded by three sides, four sides or more. The infrared generator cover with an annular structure can be used on different stoves.

[0022] Preferably, a plurality of partition blocks are provided in the air preheating chamber along the circumferential direction of the axis of the infrared generating cover, and the partition blocks divide the air preheating chamber into a plurality of small preheating chambers along the circumferential direction of the axis of the infrared generating cover.

[0023] The spiral and radial dividing blocks divide the air preheating chamber into several preheating chambers, so that the air entering the preheating chamber is forced to flow along a curved path, thereby increasing the flow path of the preheating air, making the path of the preheating air longer and the flow time longer, so that the preheating air can have a more sufficient heat exchange in the preheating chamber, making the preheated air temperature higher. After reaching the air outlet, it is ejected tangentially, forming a certain swirl effect.

[0024] In addition, adjacent preheating chambers are isolated from each other, and the flow of air in each preheating chamber will not be affected by other preheating chambers, so that the air flows more stably in each preheating chamber, and the preheated air flowing out of the air outlet is also more stable, which makes the secondary combustion of the gas more stable, thereby improving the efficiency of the secondary combustion of the gas.

[0025] Preferably, the dividing stop is spiral-shaped.

[0026] The spiral partition divides the air preheating chamber into several preheating small chambers, so that the air entering the preheating small chamber is forced to flow along a curved path, thereby increasing the flow path of the preheating air, making the path of the preheating air longer and the flow time longer, so that the preheating air can have a more sufficient heat exchange in the preheating small chamber, making the preheated air temperature higher. After reaching the air outlet, it is ejected tangentially, which is more conducive to forming a certain swirl effect.

[0027] Preferably, the infrared generating cover is a flat plate structure.

[0028] The infrared generating cover can also be set as a flat plate structure so as to be suitable for use in a barbecue oven or teppanyaki.

[0029] Preferably, an infrared auxiliary generating component is arranged inside the infrared generating cover, and the infrared auxiliary generating component includes the infrared auxiliary generating cover.

[0030] The metal mesh infrared auxiliary generator hood is easily heated and reddened by the flame gas. The preheated air at the air outlet flows upward and encounters the reddened metal mesh, and is dispersed by the metal mesh holes. The flame gas flowing through burns rapidly under the action of the reddened metal mesh rich in high-temperature combustion-supporting air, thereby improving the efficiency of the secondary combustion of the gas.

[0031] Preferably, it also includes a return air chamber, which is in contact with the air preheating chamber; a return air inlet connected to the return air chamber is arranged in the circumferential direction of the top of the infrared generating cover, and a return air outlet is arranged at one end of the return air chamber away from the return air inlet; the return air outlet is connected to the chimney.

[0032] In addition to allowing the post-combustion gas to be discharged in a centralized manner and not flowing into a space where the human body can come into contact, the chimney forms a negative pressure after being started, which has a certain suction effect on the smoke generated by the entire combustion. This suction effect prevents the flame gas from leaking out of the fire-watching pressure relief device, but instead sucks in a small amount of external air and discharges it from the smoke pipe. The fire-watching pressure relief device can observe the combustion of the gas appliance, and at the same time keep the internal pressure stable to avoid the sudden expansion of the burning flame gas. The smoke exhaust system is a natural aspiration smoke exhaust or a fan-assisted smoke exhaust.

[0033] When the flue gas passes through the return air chamber, the residual heat can be reabsorbed by the air in the air preheating chamber, so that the air preheating chamber can recover the residual heat in the flue gas.

[0034] The chimney effect formed by the chimney can speed up the flow rate inside the infrared energy-saving hood, promote the operation of the return air cavity, form a negative pressure in the fire-watching pressure relief device, and prevent the gas combustion products from being discharged into the cooking environment at close range, thus protecting the health of the cooking personnel.

[0035] The present application also provides a gas appliance, comprising the above-mentioned infrared energy-saving cover, and also comprising a burner arranged in the middle position of the infrared generating cover.

[0036] The gas appliance made of infrared energy-saving cover has the functions of high gas combustion efficiency and fuel saving, and also has good windproof function.

[0037] The present application also provides a gas appliance, including the above-mentioned infrared energy-saving cover, the infrared energy-saving cover is a flat plate structure, and also includes a gas pipe.

[0038] The infrared energy-saving cover with a flat plate structure can be applied to some special situations, such as ovens and barbecue grills, so as to improve the combustion efficiency of the gas in the ovens and barbecue grills.

[0039] Preferably, the infrared generator cover is arranged vertically; a mesh cooker is arranged on one side of the infrared generator cover away from the air preheating chamber; and the gas pipe is arranged at the bottom between the mesh cooker and the infrared generator cover.

[0040] Preferably, the infrared generating hood is arranged at an angle, and the gas pipeline is arranged at the lower end of the infrared generating hood.

[0041] Compared with the prior art, the present invention has the following beneficial effects: In the gas appliance of the present invention, when the fire is low, the air ejected from the lower air outlet participates in the combustion. When the gas supply is gradually increased, the combustion reaction moves upward, and the air ejected from the gradually upward air outlet participates in the combustion, until the corresponding air outlet also participates in the combustion under the maximum heat load. This structural layout allows the heat load of the gas appliance to be continuously adjusted, and the difference in thermal efficiency is small under different heat load conditions.

[0042] Tests on some existing premixed gas stoves show that the energy-saving effect of using the infrared energy-saving cover in this application is obvious. Compared with boiling water using an ordinary bracket, the test is conducted without turning off the fire. The time saved in boiling the same amount of water is about 38%, and the energy-saving effect is significant. The content of CO and nitrogen oxides in the flue gas is reduced, and there is no carbon deposit on the bottom of the pot. Instead, the carbon deposits on the pot can be burned and removed.

[0043] After the implementation of the present invention, the high-temperature combustion area achieves flameless combustion during cooking, and the flame will not spread to the outside of the pot edge. The heat radiation and heat convection generated are largely absorbed by the bottom of the pot. The temperature of the smoke discharged from the outside of the pot edge during normal use is significantly reduced, and it is not easy for the handle of a spatula and other cooking utensils to be damaged by heat after being placed in the pot or to be burned when used again. Infrared high-temperature cooking reduces cooking time, improves production efficiency, and increases the taste of food, which is particularly suitable for the requirements of Chinese food stir-frying.

[0044] The infrared energy-saving cover of the present invention belongs to a device for generating infrared rays by secondary combustion of gas flames, and is suitable for partially premixed gas appliances. For fully premixed gas appliances, if the primary combustion is complete, there is almost no secondary combustion. The gas energy-saving cover can produce heat insulation and windproof effects, but does not have the function of secondary oxygen supplementation combustion. However, in actual use, due to factors such as changes in gas pressure and changes in the proportion of premixed air, the primary combustion of fully premixed gas appliances is not complete, and secondary combustion is required. However, the temperature of the exhaust of the primary combustion of the fully premixed gas appliance is relatively high, and it reacts immediately when it encounters external air, making the flame gas of this secondary combustion not obvious. Using the energy-saving cover on the fully premixed gas appliance, after its combustion conditions change, the secondary combustion air is supplemented by the energy-saving cover, rather than obtained from the outside air. As a preservation function to cope with changes in combustion conditions, the gas energy-saving cover can play a positive role in the fully premixed gas appliances in actual use. In addition, the air preheating cavity can bring the heat conducted out back to the combustion area by the preheated air to heat the pot. The flexible shape of the infrared energy-saving cover can form a wrapping effect on the pot, which can reduce heat diffusion and prevent the flow of external air from taking away heat. In summary, the use of the energy-saving hood on a fully premixed gas appliance has obvious benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a cross-sectional view of the present invention.

[0046] Figure 2 It is a three-dimensional structural diagram of the present invention.

[0047] Figure 3 This is a cross-sectional view of a layered plate having two layers in Example 2 of the present invention.

[0048] Figure 4 This is a cross-sectional view of a layered plate having one layer in Example 2 of the present invention.

[0049] Figure 5 It is a schematic structural diagram of a case where a chamber partition plate is provided in the partition chamber of the present invention.

[0050] Figure 6 It is a schematic structural diagram of the chamber partition plate of the present invention being arranged in a horizontal direction.

[0051] Figure 7 It is a schematic structural diagram of the chamber partition plates of the present invention when they are distributed in a wave shape.

[0052] Figure 8 It is a schematic structural diagram of the chamber partition plates of the present invention when they are distributed in a stepped manner.

[0053] Fig. 9 It is a schematic diagram of the splitter blocks of the present invention when they are distributed in a radial shape.

[0054] Fig.10 It is a schematic diagram of the dividing baffles of the present invention when they are distributed in a spiral shape.

[0055] Fig.11 It is a three-dimensional structural diagram when a convex head is arranged on the infrared generating cover of the present invention.

[0056] Fig.12 It is a three-dimensional structural diagram of the infrared generating cover of the present invention when the convex heads are distributed in a spiral shape.

[0057] Fig.13 It is a three-dimensional structural diagram when an air nozzle is arranged on the air outlet of the present invention.

[0058] Fig.14 It is a cross-sectional view of the air outlet of the present invention when an air nozzle is provided.

[0059] Fig.15 It is a schematic structural diagram of the gas nozzle of the present invention when it is in the shape of a tree branch.

[0060] Fig.16 It is a schematic structural diagram of the air nozzle of the present invention when it is in a lotus shape.

[0061] Fig.17 It is a schematic structural diagram of the gas nozzle of the present invention when it is in a vertical shape.

[0062] Fig.18 It is a schematic structural diagram of the gas nozzle of the present invention when it is in an inclined state.

[0063] Fig.19 It is a schematic structural diagram of the gas nozzle of the present invention when it is in a spirally extended state.

[0064] Fig. 20 It is a schematic diagram of the structure when the air nozzle of the present invention extends into both the air preheating chamber and the infrared ray generating area.

[0065] Fig.21 It is a schematic diagram of a case where the air outlet of the air nozzle of the present invention is in an oblique shape.

[0066] Fig. 22 It is a schematic diagram of the air nozzle of the present invention when it only extends into the air preheating chamber.

[0067] Fig.23 It is a schematic diagram of the case where the air outlet of the air nozzle of the present invention is tooth-shaped.

[0068] Fig.24 It is a schematic diagram showing that the air inlet cross-sectional area of ​​the air nozzle of the present invention is larger than the air outlet cross-sectional area.

[0069] Fig.25 It is a schematic diagram of the structure in which the air nozzle of the present invention is extended and wavy.

[0070] Fig.26It is a cross-sectional view of the present invention when an infrared auxiliary generating cover is provided.

[0071] Fig. 27 It is a three-dimensional structural diagram when the infrared auxiliary generating cover of the present invention is a curved surface.

[0072] Fig.28 It is a three-dimensional structural diagram when the infrared auxiliary generating cover of the present invention is in a corrugated shape.

[0073] Fig.29 It is a three-dimensional structural diagram of the present invention when an infrared auxiliary generating spring is provided.

[0074] Fig.30 It is a cross-sectional view of the present invention when a return air chamber and a chimney are provided.

[0075] Fig.31 It is a cross-sectional view of the present invention when a return air chamber, a chimney and a condensing device are provided.

[0076] Fig.32 It is a top view of the cartridge stove of the present invention.

[0077] Fig.33 It is a cross-sectional view of an outdoor stove of the present invention.

[0078] Fig.34 It is a cross-sectional view of the heat collecting integrated furnace of the present invention.

[0079] Fig.35 It is a cross-sectional view of the pancake oven of the present invention.

[0080] Fig.36 It is a cross-sectional view of the braising stove of the present invention.

[0081] Fig.37 It is a cross-sectional view of a gas rice cooker of the present invention.

[0082] Fig.38 It is a cross-sectional view of the oil burner of the present invention.

[0083] Fig.39 It is a sectional view of an alcohol stove of the present invention.

[0084] Fig.40 It is a cross-sectional view of the oven of the present invention.

[0085] Fig.41 It is a three-dimensional structural diagram of the barbecue oven of the present invention.

[0086] Fig.42 It is a three-dimensional structural diagram of the fire cover teppanyaki of the present invention.

[0087] Fig.43 It is a three-dimensional structural diagram of the fire cover teppanyaki of the present invention when a flat pot is installed.

[0088] In the figure: 1, infrared generating cover, 11, convex head, 12, air nozzle; 2. thermal insulation cover, 21. thermal insulation wall, 22. thermal insulation cavity; 3. Air preheating chamber, 31. Air inlet channel, 32. Air outlet, 33. Bracket, 34. Layered plate, 341. First layered plate, 3411. First connecting hole, 342. Second layered plate, 3421. Second connecting hole, 35. Partition chamber, 351. First partition chamber, 352. Second partition chamber, 353. Third partition chamber, 36. Chamber partition plate, 37. Air inlet chamber, 371. Air inlet hole, 38. Partition stopper, 4. Infrared auxiliary generating cover, 41. Infrared auxiliary generating spring; 5. Return air chamber, 51. Return air inlet, 52. Return air outlet, 53. Transparent fire viewing window, 54. Pressure relief trough, 55. Condensation device, 56. Chimney; 6. furnace body, 61. gas tank, 62. barrel-shaped opening, 63. supporting feet, 64. gas pipeline, 65. feeding fan, 66. oven door, 67. flat pot, 68. oil tray; 7. Stove head; 8. Flat cookware, 81. Fin-shaped structure; 9. Gas pipe, 91. Flame outlet. DETAILED DESCRIPTION

[0089] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings: Example 1: Figure 1 and Figure 2 As shown, an infrared energy-saving cover comprises: an infrared generating cover 1, and a heat-insulating cover 2 arranged outside the infrared generating cover 1. An air preheating chamber 3 is arranged between the heat-insulating cover 2 and the infrared generating cover 1; the air preheating chamber 3 is provided with an air inlet passage 31 communicating with the outside air, and the infrared generating cover 1 is provided with a plurality of air outlets 32; air enters from the air inlet passage 31, passes through the air preheating chamber 3, and flows out from the air outlet 32.

[0090] In one embodiment, the infrared generator cover 1 is an annular structure, which includes a strictly circular ring structure, and also includes a triangular ring or polygonal ring surrounded by three sides, four sides or more. The infrared generator cover 1 in this embodiment is an annular structure, and the infrared generator cover 1 is a trumpet-shaped with a gradually increasing opening. A plurality of brackets 33 (four brackets 33 in this embodiment) are arranged in the inner circumferential direction of the infrared generator cover 1. The brackets 33 are protrudingly arranged on the surface of the infrared generator cover 1, and the brackets 33 are arranged along the axial direction of the infrared generator cover 1. When in use, the pot is placed on the bracket 33, the bottom of the pot is adapted to the surface shape of the infrared generator cover 1, and the gas flame at the bottom flows along the bottom of the pot to heat the infrared generator cover 1, thereby heating the air preheating chamber 3.

[0091] The infrared generating area or infrared radiation area is the area near the bottom of the pot when the infrared generating cover 1 is used. The air preheating chamber 3 is a hollow structure, and the air inlet channel 31 is arranged at the bottom of the air preheating chamber 3. The air flows in from the bottom of the air preheating chamber 3, and when passing through the air preheating chamber 3, the air is heated, and the heated air is ejected from the air outlet 32, and high-temperature secondary combustion occurs with the gas. The high temperature generated by the secondary combustion is dispersed along the bottom of the heated utensils, and the high temperature generated by the chemical reaction of the secondary combustion directly forms a large amount of thermal convection impact on the heated utensils (pots), so that the secondary combustion products are completely burned under the impact of high-temperature air, achieving flameless combustion. Uniform and intense combustion releases higher energy and emits infrared rays. The combustion reaction of the hot air ejected from the air outlet 32 ​​and the high-speed gas mixture induces thermal convection, and the thermal efficiency is improved in combination with infrared radiation. In this high-temperature infrared radiation environment, the gas that is not completely burned out is fully burned, and the gas cooled by the bottom of the pot is re-ignited. In the high-temperature air combustion-supporting environment heated by the air preheating chamber 3, the combustible gas can be consumed completely to avoid the formation of harmful gases and black pots.

[0092] In the gas appliance of the present invention, when the fire is low, the air ejected from the lower air outlet 32 ​​participates in the combustion. When the gas supply is gradually increased, the combustion reaction moves upward, and the air ejected from the gradually upward air outlet 32 ​​participates in the combustion, until the corresponding air outlet 32 ​​also participates in the combustion under the maximum heat load. This structural layout allows the heat load of the gas appliance to be continuously adjusted, and the difference in thermal efficiency is small under different heat load conditions.

[0093] Tests on some existing premixed gas stoves show that the energy-saving effect of using the infrared energy-saving cover in this application is obvious. Compared with boiling water using an ordinary bracket, the test is conducted without turning off the fire. The time saved in boiling the same amount of water is about 38%, and the energy-saving effect is significant. The content of CO and nitrogen oxides in the flue gas is reduced, and there is no carbon deposit on the bottom of the pot. Instead, the carbon deposits on the pot can be burned and removed.

[0094] After the implementation of the present invention, the high-temperature combustion area achieves flameless combustion during cooking, and the flame will not spread to the outside of the pot edge. The heat radiation and heat convection generated are largely absorbed by the bottom of the pot. The temperature of the smoke discharged from the outside of the pot edge during normal use is significantly reduced, and it is not easy for the handle of a spatula and other cooking utensils to be damaged by heat after being placed in the pot or to be burned when used again. Infrared high-temperature cooking reduces cooking time, improves production efficiency, and increases the taste of food, which is particularly suitable for the requirements of Chinese food stir-frying.

[0095] The infrared energy-saving cover of the present invention belongs to a device for generating infrared rays by secondary combustion of gas flames, and is suitable for partially premixed gas appliances. For fully premixed gas appliances, if the primary combustion is complete, there is almost no secondary combustion. The gas energy-saving cover can produce heat insulation and windproof effects, but does not have the function of secondary oxygen supplementation combustion. However, in actual use, due to factors such as changes in gas pressure and changes in the proportion of premixed air, the primary combustion of fully premixed gas appliances is not complete, and secondary combustion is required. However, the temperature of the exhaust of the primary combustion of the fully premixed gas appliance is relatively high, and it reacts immediately when it encounters external air, making the flame gas of this secondary combustion not obvious. Using the energy-saving cover on the fully premixed gas appliance, after its combustion conditions change, the secondary combustion air is supplemented by the energy-saving cover, rather than obtained from the outside air. As a preservation function to cope with changes in combustion conditions, the gas energy-saving cover can play a positive role in the fully premixed gas appliances in actual use. In addition, the air preheating chamber 3 can bring the heat conducted out back to the combustion area by the preheated air to heat the pot. The flexible shape of the infrared energy-saving cover can form a wrapping effect on the pot, which can reduce heat diffusion and prevent the flow of external air from taking away heat. In summary, the use of the energy-saving hood on a fully premixed gas appliance has obvious benefits.

[0096] The actual use process of the present invention is as follows: remove the original gas stove bracket, place the infrared energy-saving cover in the present application at the original gas stove bracket position, place the pot, and ignite it before use. In the initial stage, the flame of the original gas stove remains blue and gradually impacts the cavity shell of the air preheating cavity 3. During this process, the air outlet of the air preheating cavity 3 begins to flow out air under the induced effect of the gas flame. At this time, the air enters from the outer side of the lower part of the infrared energy-saving cover of the present application, and enters the air intake channel 31 after initially absorbing the heat on the gas stove panel and the lower part of the energy-saving cover; further absorbs the heat of the stove head and the stove panel, and enters the hollow structure of the air preheating cavity 3. After absorbing the heat of the cavity shell of the air preheating cavity 3, it flows out from the air outlet 32. As the temperature of the infrared generating cover 1 gradually rises, the temperature of the preheated air rises, and the air preheating cavity 3 has been started. After about 40 seconds, the surface of the infrared generating cover 1 close to the combustion surface begins to turn red, and after two minutes, the cavity shells of all infrared generating covers 1 turn red. At this time, the flame sprayed from the small fire port at the bottom of the gas stove is still blue, and the lower part of the flame sprayed from the large fire cover is blue. The upper part becomes a red mist flame after entering the energy-saving cover. After reaching the middle and upper part of the infrared energy-saving cover, the flame cannot be seen. The overall infrared energy-saving cover is in a red transparent radiation environment, and the working medium of the pot is obviously heated at this time. After 4 minutes, the infrared energy-saving cover enters a stable working state. Due to the thick insulation part, the temperature difference between the outer side of the lower part of the infrared energy-saving cover and the environment is not large after 10 minutes of startup. The temperature of the outer side of the lower part will still rise after half an hour of startup, and then remain stable. When the gas stove switch knob is turned down, the infrared radiation environment gradually darkens as the flame becomes smaller, and the infrared radiation area also moves down until the infrared radiation disappears after the small fire. Due to the use of the thermal insulation cover 2, the infrared energy-saving cover plays a role in windproof and heat maintenance. At this time, after adjusting from the small fire state to a larger one, because the residual temperature is still there, the infrared radiation quickly restarts. When the pot is removed, the flame of the gas stove goes up and no longer flows through the infrared radiation area, and the infrared radiation disappears quickly; shortly after it is removed, it is moved back and the infrared radiation restarts within a few seconds. This process is in line with the public's habit of operating a gas stove for cooking. After testing, there is no incomplete combustion in the initial stage and the restart stage.

[0097] In one embodiment, the cavity shell constituting the air preheating cavity 3 can be made of a single-layer, double-layer or multi-layer material. When a double-layer or single-layer material is used, it is combined together using a composite process. The cavity shell material constituting the air preheating cavity 3 includes but is not limited to metal, ceramic, composite ceramic or a heat-insulating material with a certain strength.

[0098] In one embodiment, the cavity shell of the air preheating cavity 3 can be made of a composite of a stainless steel layer and a titanium alloy layer. The titanium alloy layer is close to the infrared radiation area; and the stainless steel layer is close to one side of the air preheating cavity 3 .

[0099] In one embodiment, the cavity shell of the air preheating cavity 3 may be composed of a heat radiation absorbing coating, a metal layer and an infrared generating layer; the heat radiation absorbing layer is arranged on a side close to the air preheating cavity 3 .

[0100] The composite process used in the shell of the air preheating chamber 3 can ensure strength, improve surface performance and reduce costs. For example, electroplating stainless steel can improve the reflective performance of the shell surface; compounding with gas reaction catalytic materials can improve the combustion reaction efficiency; compounding with stainless steel and titanium alloy can reduce costs while ensuring high performance; compounding with metal ceramics can improve high temperature resistance and infrared generation capabilities.

[0101] In one of the embodiments, the bottom of the cookware can be configured to have a special-shaped surface structure with undulating grooves, fins, and gully textures to increase the surface area of ​​the heated surface of the heated appliance and absorb more heat. At the same time, the flow path of the high-temperature combustion gas mixture is blocked, forming more rotating vortices, increasing the flue gas flow path, delaying the residence time of the flue gas in the heated surface area of ​​the heated appliance, and promoting the absorption of heat by the heated appliance. The high-temperature air at the air outlet ensures the full reaction of the gas and avoids carbon deposits formed by incomplete combustion that clog the special-shaped surface structure with undulating grooves, fins, and gully textures at the bottom of the heated appliance.

[0102] The cookware and the air preheating chamber 3 are similar in shape near the combustion reaction side. When the heated cookware is a barrel-shaped structure, the infrared energy-saving cover is also a barrel-shaped structure, which allows the cookware to be more wrapped by the secondary combustion area, forming a larger heating area ratio. At the same time, the insulation part ratio is also increased, and the thermal efficiency is further improved.

[0103] When the cookware is a planar structure (such as a teppanyaki cookware), the infrared energy-saving cover may also be a flat plate structure.

[0104] When the gas flame does not actively impact the cavity shell of the air preheating cavity 3, the flame enters the infrared generating area under the cover pressure of the cookware, and high-temperature combustion can be generated to generate infrared rays. Therefore, when the cookware is taken away and the flame is maintained, the infrared radiation disappears quickly, and the gas flame no longer heats the infrared energy-saving cover. The infrared energy-saving cover is as if it has never been placed, and the gas appliance changes to its inherent combustion mode.

[0105] Different from a fully premixed gas stove, the feature of the present invention is the secondary reaction multi-point distributed combustion, which makes it have no requirements on the shape of the cookware, can adapt to the shape of the cookware, and manufacture products of cookware in various shapes, thus avoiding the uneven cooking caused by the inconsistency between the porous ceramic plane of the existing infrared gas stove and the shape of the cookware.

[0106] Similar to fully premixed gas appliances, most of its heating method is infrared radiation. Although the heat convection and heat radiation of secondary combustion at the air outlet promote each other, the bottom of the cookware still needs to be made of a material that can easily absorb infrared radiation, increase the roughness or concave-convex structure to increase the surface area, so as to promote absorption and improve thermal efficiency.

[0107] Example 2: Figure 3 to Figure 4 As shown, the structure of this embodiment is similar to that of Embodiment 1, except that a plurality of layered plates 34 distributed along the thickness direction are provided in the air preheating chamber 3, and the layered plates 34 are annular in shape. The plurality of layered plates 34 divide the air preheating chamber 3 into a plurality of partition chambers 35 along the thickness direction; the plurality of partition chambers 35 are coaxially arranged, and the two ends of adjacent partition chambers 35 are connected at staggered intervals to form a curved channel. The cross-sectional area of ​​the curved channel is larger than the total cross-sectional area of ​​the air outlet 32. Since the infrared generator hood 1 in this embodiment is an annular structure, the shape of the partition chamber 32 is also annular; however, it should be noted that when the infrared generator hood 1 is a flat plate structure, the partition chamber 32 at this time can also be set to a flat plate shape (such as Fig.40 as shown).

[0108] like Figure 3 As shown, in this embodiment, two layered plates 34 are provided, and the two layered plates 34 divide the air preheating chamber 3 into three partition chambers 35, that is, the number of the partition chambers 35 is an odd number. The two layered plates 34 are sequentially a first layered plate 341 and a second layered plate 342 from the inside to the outside, and the three partition chambers 35 are sequentially a first partition chamber 351, a second partition chamber 352, and a third partition chamber 353 from the inside to the outside. An air inlet passage 31 is provided at the bottom of the third partition chamber 353, a plurality of second connecting holes 3421 connecting the second partition chamber 352 and the third partition chamber 353 are provided at the top of the second layered plate 342, and a plurality of first connecting holes 3411 connecting the first partition chamber 351 and the second partition chamber 352 are provided at the bottom of the first layered plate 341; the air flows through the air inlet passage 31 into the third partition chamber 353, flows upward in the third partition chamber 353, then enters the second partition chamber 352 through the second connecting holes 3421, flows downward in the second partition chamber 352, then enters the first partition chamber 351 through the first connecting holes 3411, then flows in the first partition chamber 351, and finally flows out from the air outlet 32. The first partition chamber 351, the second partition chamber 352, and the third partition chamber 353 form a curved passage due to the provision of the first connecting holes 3411 and the second connecting holes 3421.

[0109] The multi-layer partition chamber 35 forms a layered space in the air preheating chamber 3. The layered space of the air preheating chamber 3 belongs to the flow space of the secondary air. The air flowing through it will eventually flow out from the air outlet 32 ​​to participate in the secondary combustion. The shape of the layered space is close to the cavity shell close to the infrared generator hood, making it easier for the secondary air to get close to the infrared generator hood 1, thereby completing heat exchange with the cavity shell heated by the infrared generator hood, which is more conducive to the preheating of the secondary air. The cross-section of the curved channel flow is larger than the total cross-section of the corresponding air outlet 32 ​​to ensure the orderly flow of the secondary air. At the same time, the larger curved channel and smaller air outlet 32 ​​can increase the air flow rate of the air outlet 32, which is conducive to the secondary combustion reaction.

[0110] The infrared generating area is the area of ​​the infrared generating cover 1 close to the bottom of the pot. The air preheating chamber 3 is the preheating area before the preheated air enters the infrared generating area. It is relatively close to the infrared generating area and has a higher temperature. When the air intake cross-section of the layered space is larger than the total cross-section of the corresponding air outlet 32 ​​(the Venturi effect is more obvious when it is 6-10 times larger), the thickness of the layered plate 34 is thinner and uniform. The high temperature radiation of the infrared generating cover 1 is more evenly distributed in the layered space, and its temperature gradient is not greatly reduced. The heat absorption effect on the infrared generating cover is limited, which can promote the generation and maintenance of infrared rays. When the partition chamber 35 is thinner, it is closer to the infrared generating area, and it is easier to maintain high temperature, so that the temperature of the preheated air is higher. At the same time, when it is used specifically, the layered plate 34 is also set to a thinner thickness, and the specific thickness is between 0.3 mm and 1.2 mm, preferably 0.8 mm.

[0111] like Figure 4 As shown, in one embodiment, one stratified plate 34 is provided, and the number of partition chambers 35 is an even number. The air participating in the secondary combustion can bring the heat energy that has been transferred to the interior of the partition chamber 35 back to the secondary combustion area through the curved channel. The use of two or more partition chambers 35 allows the external cold air to be gradually preheated, and gradually flows from the partition chamber 35 with a relatively low temperature to the higher temperature area, gradually absorbing the conducted heat. Under the condition of flame gas introduction, the secondary air enters from the bottom, passes through the curved channel and then reaches the air outlet 32 ​​downward, so that the secondary air has a downward vector velocity, which is in conflict with the flame gas flow direction. The turbulence caused by this impact is beneficial to the secondary combustion reaction (such as Figure 4 ).

[0112] The partition chamber 35 cooperates to form a siphon structure, which can reduce the load of the ejection force, so that the initial velocity of the ejected secondary air is not affected. At the same time, it can collect heat layer by layer, and bring the conducted heat back into the infrared generation area to become effective heat, which has a positive significance. Part of the heat is conducted to the inside of the air preheating chamber 3, and then to the partition chamber 35 and the thermal insulation cover 2. The multi-layer partition chamber 35 conducts heat slowly. Even if some heat is conducted out, part of it will be used to preheat the secondary air for combustion. After the combustion-supporting secondary air carries this heat through the air preheating chamber 3, it gradually approaches the air outlet 32 ​​and is preheated step by step. The temperature is getting higher and higher, and it is finally brought into the infrared generation area to support secondary combustion and be absorbed by the heating device again.

[0113] Example 3: Figures 5 to 8 As shown, the structure of this embodiment is similar to that of the embodiment 2, except that a plurality of chamber partition plates 36 are arranged in the partition chamber 35 near the infrared generating cover 1, and the plurality of chamber partition plates 36 are arranged in the vertical direction of the partition chamber 35, and the chamber partition plates 36 divide the partition chamber 35 into small air inlet chambers 37; an air inlet hole 371 is arranged at one end of each small air inlet chamber 37, and the other end is connected to at least one air outlet 32. The air inlet hole 371 of each small air inlet chamber 37 is arranged below the air outlet 32, so that the small air inlet chamber 37 forms an air inlet channel inclined upward, so that when the air is preheated, it can automatically flow upward.

[0114] The chamber partition plate 36 is not limited to being arranged in a horizontal direction (such as Figure 6 ), wave distribution settings (such as Figure 7 ) or a stepped distribution setting (such as Figure 8 ).

[0115] The functions of the dividing layer of the chamber dividing plate 36 are as follows: first, the cavity wall of the divided small air intake chamber 37 can act as a cavity with a heat-insulating effect, reducing the heat conduction to the outside; second, the flow path of the preheated air is extended, the preheating time is increased, and the temperature of the preheated air is increased; third, the size of the air outlet 32 ​​of each divided chamber can be arranged so that the preheated air flows in an orderly manner and is reasonably distributed (each small air intake chamber corresponds to a circle of air outlets. If the position of this circle happens to need to supplement more preheated air, the corresponding air outlet is enlarged, otherwise it is reduced); fourth, when the external wind blows towards the air outlet 32, the preheated air flow and backflow caused by factors such as external wind can be reduced; fifth, the added chamber dividing plate 36 and layering plate 34 can increase the inner surface area of ​​the air preheating cavity 3, so that the preheated air has more opportunities to contact and collide with the inner wall of the air preheating cavity 3, making it easier to complete heat exchange and better complete air preheating (such as Figure 3). From the direction of the normal line of the chamber wall of the chamber partition plate 36, the larger the inclination angle of the inclined chamber partition plate 36 and the stepped chamber partition plate 36 and the more steps there are, the more small air intake chambers 37 the normal line passes through, the better the heat insulation effect is, and the higher the preheated air temperature is.

[0116] Example 4: Fig. 9 and Fig.10 As shown, this embodiment is similar in structure to Example 1 or Example 2, except that a plurality of partition blocks 38 are provided in the air preheating chamber 3 along the circumferential direction of the axis of the infrared generating hood 1, and the partition blocks 38 divide the air preheating chamber 3 into a plurality of preheating small chambers along the circumferential direction of the axis of the infrared generating hood 1.

[0117] The dividing block 38 may be a radial shape distributed along the air preheating chamber 3 (eg Fig. 9 , viewed from the top), the dividing block 38 can also be a spiral shape distributed along the air preheating chamber 3 (such as Fig.10 , viewed from a top view). The dividing baffle 38 includes but is not limited to a spoke shape and a spiral shape.

[0118] The spiral and radial dividing baffles 38 divide the air preheating chamber 3 into several preheating chambers, so that the air entering the preheating chamber is forced to flow along a curved path, thereby increasing the flow path of the preheating air, making the path of the preheating air longer and the flow time longer, so that the preheating air undergoes more sufficient heat exchange in the preheating chamber, making the preheated air temperature higher. After reaching the air outlet 32, it is ejected tangentially, forming a certain swirl effect.

[0119] In addition, adjacent preheating chambers are isolated from each other, and the flow of air in each preheating chamber will not be affected by other preheating chambers, so that the air flows more stably in each preheating chamber, and the preheated air flowing out of the air outlet 32 ​​is also more stable, which makes the secondary combustion of the gas more stable, thereby improving the efficiency of the secondary combustion of the gas.

[0120] Example 5: Reference Fig.11 , Fig.12 As shown, the structure of this embodiment is similar to that of Example 1 or Example 2 or Example 3 or Example 4, except that a plurality of protrusions 11 are provided on the side wall of the infrared generating cover 1 , and the air outlets 32 are provided on the protrusions 11 .

[0121] The convex heads 11 are distributed on the inner side of the infrared generator cover 1, and the convex heads 11 form an undulating concave-convex surface on the surface of the infrared generator cover 1. This increases the reflection area of ​​the surface of the infrared generator cover 1, and increases the chances of the cookware receiving secondary rebound radiation; it also makes the air outlet 32 ​​collide with the gas flame, making the mixing more uniform, the turbulence stronger, and the secondary combustion of the gas more complete.

[0122] In addition, the protrusion 11 can be configured to be a spiral shape corresponding to the spiral dividing block (eg Fig.12 As shown in the figure, each upward flame airflow encounters the corresponding preheated air, producing a stronger swirl effect, which helps the secondary combustion of the gas to be more complete.

[0123] In addition, the infrared generating cover 1 can also be set into a variety of forms, including a flat surface, a curved surface, a surface with undulating convex and concave surfaces, a surface with fins, a surface with spiral protrusions, and a special-shaped surface with a grooved texture structure; the infrared generating cover 1 can be made of materials including but not limited to materials that are easy to emit and reflect infrared rays, or the surface can be coated with infrared reflecting and emitting coatings.

[0124] The various forms of the infrared generating cover 1 can increase the surface area of ​​the infrared generating cover 1 and increase the number of reflections of the heat radiation in the infrared generating cover 1 so that it can be absorbed by the cookware as much as possible, thereby improving the thermal efficiency. At the same time, the high-temperature multi-form infrared generating cover 1 can increase the combustion catalytic surface and promote the combustion reaction. The extra surface area also has a certain heat storage effect, which is beneficial to the combustion reaction and the heating of the secondary air.

[0125] Example 6: Figures 13 to 25 As shown, the structure of this embodiment is similar to that of Embodiment 1 or Embodiment 2 or Embodiment 3 or Embodiment 4 or Embodiment 5, except that an air nozzle 12 is provided at the air outlet 32, and the air nozzle 12 is a tubular structure.

[0126] The air nozzle 12 can be a separate component, or can be integrally formed with the infrared generating cover 1 .

[0127] like Figures 15 to 25 As shown, the air nozzle 12 may be a single tubular structure (eg Figures 17 to 25 ) or a branched tubular structure (e.g. Fig.15 and Fig.16 as shown).

[0128] According to the Venturi effect, low pressure will be generated near the high-speed flowing fluid, thus generating a suction effect. The negative pressure generated by the upward flow of the gas flame and the kinetic energy generated by the preheated air from the bottom to the top make the air at the air outlet flow out automatically, while also ensuring that the siphon structure set up inside to absorb the dissipated heat can operate. Due to the inertial effect, the momentum direction of the air flowing out of the tubular structure gas nozzle 12 after flowing out is related to the tilt, twist, and spiral mode of the tubular structure gas nozzle 12. The high-temperature air ejected is perpendicular or tilted to the flow direction of the gas flame, which can significantly improve the convective heat reaction between the high-temperature air and the flame. The special-shaped cross-section of the air outlet 32 ​​and the shape of the air outlet 32 ​​can further optimize the combustion reaction under such heat convection conditions.

[0129] The branches of the branched tubular nozzle structure are separated from a single tube and present a tree-like shape (such as Fig.15 ) or lotus-shaped (such as Fig.16 ), the outlets of each air outlet branch remain dispersed; a single tubular air nozzle structure includes a vertical shape (such as Fig.17 ), tilted morphology (such as Fig.18 ), curve elongation shape, spiral extension shape (such as Fig.19 ).

[0130] The tubular air nozzle structure can also extend into the air preheating chamber 3 (such as Fig.19 , Fig.24 ), or extending to the infrared generating area (such as Fig.17 , Fig.18 , Fig.23 ) or extends into the air preheating chamber 3 and also extends into the infrared generating area (such as Fig. 20 , Fig.21 As shown). After the air nozzle 12 is extended, it is easy to be heated by the flame gas, thereby preheating the air flowing through it. In addition, the spirally extended air nozzle 12 can adjust the flow state of the preheated air after it is ejected, and the swirling air is highly mixed with the flame gas, and the combustion reaction is fast.

[0131] When the spirally extended tubular air nozzle structure acts as the preheating body, the tubular air nozzle structure acts as the preheating body, and no more air preheating chamber 3 is needed for preheating. The air preheating chamber 3 is reduced and weakened, and plays the role of collecting heat through the flowing secondary air and returning it to the infrared generating part.

[0132] When the tubular air nozzle structure not only extends into the air preheating chamber 3 but also extends into the infrared generating area, the air outlet of the infrared generating area is wrapped in the high-temperature gas mixture. After the high-temperature air of the air outlet 32 ​​is ejected, the air outlet 32 ​​reacts violently and turns to infrared first, which can promote the temperature rise of the preheated air and has a stronger gas digestion ability. At the same time, the space between the tubular air nozzle structures becomes a channel for the gas mixture to be discharged upward, and this channel also provides space for the preheating of the tubular air nozzle structure. The area of ​​the secondary combustion reaction moves upward due to the extension of the tubular air nozzle structure, and is closer to the bottom of the heated device, thereby improving the thermal efficiency. The above layout avoids the situation that some existing energy-saving covers are too far away from the bottom of the heated device in order to ensure the smooth discharge of the gas mixture, resulting in low heating efficiency. At the same time, the extension of the tubular air nozzle structure leaves a channel for the discharge of smoke; it avoids the situation that some existing energy-saving covers are too close to the bottom of the pot in order to improve the thermal efficiency, resulting in narrow smoke discharge space and insufficient combustion reaction, which in turn causes safety accidents.

[0133] When the curved elongated or spirally extended air nozzle structure acts as the preheating body, the air preheating chamber 3 is reduced and weakened; the air nozzle 12 is processed or disassembled from the air preheating chamber 3 body; the cross-section of the tubular air nozzle structure at the air outlet 32 ​​includes circular, elliptical, polygonal, and irregular shapes, and the air outlet of the air nozzle 12 includes flat cut, oblique cut (such as Fig.21 ), toothed (such as Fig.23 ), special shapes.

[0134] The air outlet of the gas nozzle 12 is set in different shapes, so that the air velocity direction of the gas nozzle 12 is oblique, perpendicular, or opposite to the flow direction of the gas flame, thereby enhancing the degree of mixed convection of high-temperature air and secondary gas and improving combustion efficiency. The various forms of the tubular structure of the gas nozzle 12 can meet the needs of heat radiation and heat convection under different working conditions.

[0135] The tubular structure of the air nozzle 12 includes a shape in which the cross-section is uniform in thickness, or a shape in which the air inlet cross-sectional area is larger than the air outlet cross-sectional area (such as Fig.24 ).

[0136] The tubular structure of the present invention provides high-temperature air. Under the action of the pressure cover of the heated device, the flame of the primary combustion is forced to flow through the infrared generating area. After encountering the tubular air nozzle structure, a large amount of flame gas impacts the tube wall of the tubular air nozzle structure, causing the tubular air nozzle structure to redden. The air ejected with a certain initial velocity has a higher temperature, and a strong combustion reaction occurs when encountering unburned flame gas. This reaction occurs after the high-temperature air rushes out of the tubular structure. The interaction between the flame gas's own pressure, the secondary combustion reaction force and the air induced vector force causes strong thermal convection, and the high-temperature combustion reaction triggers infrared radiation.

[0137] The proportion of thermal convection and thermal radiation has different effects on the heat absorption of the heated device under different conditions. If the infrared absorption capacity of the heated device is limited, or thermal convection is required as the relatively main heating method: the air preheating chamber 3 has heated the air to a certain temperature, reaching the conditions for digesting the remaining combustibles in the flame gas, and the thermal efficiency will be higher if the air flow direction of the tubular air nozzle structure is adjusted. The outlet of the tubular air nozzle structure does not need to extend into the infrared generating area to generate strong thermal convection, and the thermal radiation is weak at this time, and the heated device mainly absorbs heat by thermal convection. In the case of emphasizing thermal radiation: the outlet of the tubular air nozzle structure extends to the infrared generating area, and the air nozzle 12 is reddened by the impact of the flame gas, generating infrared radiation; or the infrared auxiliary generating component covers the air outlet 32, and the flame gas and high-temperature air react near the infrared auxiliary generating component, causing the infrared auxiliary generating component to heat up rapidly and generate strong infrared radiation.

[0138] Example 7: Figure 26 to Figure 29As shown, the structure of this embodiment is similar to that of embodiment 1 or embodiment 2 or embodiment 3 or embodiment 4 or embodiment 5 or embodiment 6, except that an infrared auxiliary generating component is provided inside the infrared generating cover 1. The infrared auxiliary generating component is provided on a side of the infrared generating cover 1 away from the air preheating chamber 3; that is, the infrared auxiliary generating component is provided in the infrared radiation area or the infrared generating area.

[0139] In one embodiment, the infrared auxiliary generating unit includes an infrared auxiliary generating cover 4 (such as Fig.26 or Fig. 27 or 28). The infrared auxiliary generating cover 4 is a mesh structure; the infrared auxiliary generating cover 4 can also be a special-shaped porous structure. The side wall of the infrared auxiliary generating cover 4 can be a plane (such as Fig.26 ), curved surface (such as Fig. 27 ), corrugated surface (such as Fig.28 )structure.

[0140] The metal mesh infrared auxiliary generating hood 4 is easily heated and reddened by the flame gas. The preheated air at the air outlet 32 ​​flows upward and encounters the reddened metal mesh, and is dispersed by the metal mesh holes. The flame gas flowing through is rapidly burned under the action of the reddened metal mesh rich in high-temperature combustion-supporting air, thereby improving the efficiency of the secondary combustion of the fuel gas.

[0141] In one embodiment, the infrared auxiliary generating component further includes a plurality of infrared auxiliary generating springs 41 (such as Fig.29 ). The infrared auxiliary generating spring 41 can be provided alone or used in conjunction with the infrared auxiliary generating cover 4.

[0142] After installing the infrared auxiliary generating spring 41 inside the infrared generating cover 1, the outflow gas speed and flow direction after combustion can be adjusted, and the efficiency is significantly improved after installation; the thickness and spacing of the spring can be adjusted to suit different application scenarios. After installing the metal mesh infrared auxiliary generating cover 4, several infrared auxiliary generating springs 41 are installed from bottom to top to improve the combustion efficiency.

[0143] The materials of the infrared auxiliary generating component include but are not limited to titanium alloy, tungsten alloy, stainless steel, ceramic, composite ceramic, noble metal catalyst, transition metal catalyst, oxide catalyst. After the mesh infrared auxiliary generating component is added, the combustion reaction is similar to the principle of the David lamp. The flame is on one side of the infrared auxiliary generating component and it is difficult to enter the other side. The other side is high-temperature preheated air. The high-temperature air itself has an initial velocity to be induced and can easily pass through the channel of the infrared auxiliary generating component and then meet the flame gas. This situation is similar to the mechanism of the infrared gas stove, but different. The combustion reaction of the infrared gas stove is completed inside the infrared auxiliary generating component, while the present invention occurs afterwards. After using the infrared auxiliary generating component, the impact force of the initial velocity direction of the air outlet 32 ​​on the infrared auxiliary generating component is limited, but it still has certain positive significance.

[0144] However, under ideal conditions, if the holes of the air outlet 32 ​​are kept small and dense while ensuring sufficient secondary air volume, the infrared generating cover 1 has the same function as the infrared auxiliary generating component; however, this method makes the air outlet 32 ​​easy to be blocked, and its processing difficulty also increases. Therefore, the infrared auxiliary generating component can be used as a medium- and long-term consumable.

[0145] Example 8: Figures 1 to 4 As shown, the structure of this embodiment is similar to that of embodiment 1 or embodiment 2 or embodiment 3 or embodiment 4 or embodiment 5 or embodiment 6, except that the thermal insulation cover 2 is located on the outside of the air preheating chamber 3; the thermal insulation cover 2 includes a thermal insulation chamber 22 wrapped by a thermal insulation wall 21, and the thermal insulation wall 21 is made of metal, ceramic, and composite ceramic. The thermal insulation chamber 22 is constructed in a manner including evacuating, filling with air, filling with foamed metal, filling with thermal insulation cotton, and filling with other materials that block heat transfer; when the thermal insulation wall 21 of the thermal insulation cover 2 and the cavity shell of the air preheating chamber 3 are made of the same material, the two are an integrated structure.

[0146] The goal of a gas appliance is to absorb the chemical energy of the combustible as much as possible by the target heated part, that is, to improve thermal efficiency. The thermal insulation cover 2 of the present invention allows the chemical energy to be absorbed by the target heated part as much as possible, reducing the loss to areas outside the target heated part. The thermal insulation cover 2 uses a vacuum chamber, an air chamber, and filling with thermal insulation cotton to reduce heat loss, maintain the high temperature of the preheated air, and protect the safety of other parts of the gas appliance such as the tempered panel, providing guarantees for the generation of infrared thermal radiation and the improvement of thermal efficiency. In addition to blocking the spread of heat to the outside, the thermal insulation cover 2 also further maintains the temperature of the air preheating chamber 3, laying the foundation for the subsequent ejection of high-temperature air.

[0147] When the thermal insulation cover 2 is made of foamed aluminum or other thermal insulation materials with a certain strength, it has both structural strength and thermal insulation performance, and the outer cavity shell of the air preheating cavity 3 can be replaced by it, and the two are integrated.

[0148] Example 9: Fig.30 , Fig.31 As shown, this embodiment is similar to the structure in embodiment 1 or embodiment 2 or embodiment 3 or embodiment 4 or embodiment 5 or embodiment 6 or embodiment 7 or embodiment 8, except that it also includes a return air chamber 5, and the return air chamber 5 is correspondingly arranged in contact with the air preheating chamber 3; a return air inlet 51 connected to the return air chamber 5 is arranged in the top circumferential direction of the infrared generating cover 1, and a return air outlet 52 is arranged at the end of the return air chamber 5 away from the return air inlet 51; the return air outlet 52 is connected to the chimney 56.

[0149] In addition, a fire-viewing pressure relief device is provided on the top of the infrared energy-saving cover. The fire-viewing pressure relief device in the present application is a pressure relief groove 54, and a transparent fire-viewing window 53 can be provided on the pressure relief groove. The chimney 56 can be naturally aspirated for smoke exhaust, or a fan can be provided for auxiliary smoke exhaust.

[0150] The chimney 56 can not only discharge the combustion gas in a centralized manner and prevent it from flowing into the space where the human body can come into contact with it, but also forms a negative pressure after being started, which has a certain suction effect on the smoke generated by the entire combustion. This suction effect can prevent the flame gas from leaking out of the fire-watching pressure relief device, but will instead suck in a small amount of external air and discharge it from the smoke pipe. The fire-watching pressure relief device can observe the combustion status of the gas appliance (such as Fig.30 ), while keeping the internal pressure stable to avoid the sudden expansion of the burning flame. The exhaust system is a natural aspiration exhaust system ( Fig.31 ) or fan assisted smoke exhaust.

[0151] When the flue gas passes through the return air chamber 5 , the residual heat can be reabsorbed by the air in the air preheating chamber 3 , so that the air preheating chamber 3 can recover the residual heat in the flue gas.

[0152] The chimney effect formed by the chimney 56 can speed up the flow rate inside the infrared energy-saving hood, promote the operation of the return air chamber 5, form a negative pressure in the fire-viewing pressure relief device, and prevent the gas combustion products from being discharged into the cooking environment at close range, thereby maintaining the health of the cooking personnel.

[0153] The recovered superheated flue gas is directly discharged into the air through the chimney 56, or a condenser 55 is set in the chimney 56 to absorb heat, so that the residual heat in the flue gas can be absorbed again and discharged into the air. The running water commonly used for cooking is connected to the condenser 55, and the condenser 55 can be used to heat the running water commonly used for cooking, so that the running water used for cooking has a certain temperature, which increases the cooking speed and saves the use of gas.

[0154] It should be noted that the condensed water of the condensation device 55 is acidic due to the dissolved NOX. Alkaline materials can be used to neutralize it before discharge to reduce the pollution caused by NOX being directly discharged into the atmosphere.

[0155] Embodiment 10: A gas appliance comprises a furnace body 6, in which the infrared energy-saving cover described in any one of embodiments 1 to 9 is arranged, and further comprises a burner head 7 arranged in the middle of the infrared generating cover 1. Support legs 63 are arranged at the bottom of the furnace body.

[0156] In one embodiment, if Fig.32 As shown, the gas appliance is a cassette stove. A gas tank 61 is arranged in the stove body 6, and a gas tank for providing gas to the stove head 7 is arranged in the gas tank 61. The cassette stove adopting the infrared energy-saving cover structure can have the effect of energy saving and windproof, and can also prevent the flame gas from overflowing and heating the gas tank 61.

[0157] In one embodiment, if Fig.33 As shown, the gas appliance is an outdoor stove. An adjustable support foot 63 is provided at the bottom of the stove body 6. The outdoor stove with a common infrared energy-saving cover structure has the function of energy saving and windproof, can save filling gas, and enhance the outdoor experience.

[0158] In one embodiment, if Fig.34 As shown, the gas appliance is a heat collecting integrated furnace. The overall structure of the furnace body 6 is barrel-shaped, a barrel-shaped opening 62 is provided in the furnace body 6, and the infrared energy-saving cover is provided in the barrel-shaped opening 62, and the infrared energy-saving cover is adapted to the shape of the barrel-shaped opening 62.

[0159] The furnace body 6 is a barrel-shaped structure, with a large infrared area, a large wrapping range for the cookware, more heat-absorbing areas for the cookware, a longer heat-absorbing area through which the flame flows, a high degree of heat exchange, and the gas tank and bottom support can be stored inside the cookware, which is relatively portable and suitable for heating fluids in harsh outdoor environments such as extreme mountaineering.

[0160] In one embodiment, if Fig.35 As shown, the gas appliance is a pancake stove. A flat pot 8 is arranged on the top of the stove body 6, and the pot is rotatably arranged on the top of the stove body 6. When in use, the pot can be rotated on the top of the stove body 6, so that the heat is more uniform. In addition, a fin-shaped structure 81 is arranged on one side of the pot close to the red hood.

[0161] In one embodiment, if Fig.36 As shown, the gas appliance is a stewing stove. The bottom of the stove body 6 is provided with a support leg 63. The bottom of the stove body 6 is provided with a gas pipeline 64 connected to the stove head 7.

[0162] In one embodiment, if Fig.37 As shown, the gas appliance is a gas rice cooker.

[0163] In one embodiment, if Fig.38 As shown, the gas appliance is an oil burner. The air preheating chamber 3 is connected to the feed fan 65, and the feed fan 65 blows air into the air preheating chamber 3. The combustible fuel enters the oil burner after being pressurized by gravity or external force, and atomized flammable liquid droplets are sprayed out through the atomizing nozzle, which generates heat after being ignited by the igniter. This heat heats the subsequent atomized fuel to vaporize it, and the fan supplies oxygen for combustion. The burning flame enters the infrared energy-saving cover and preheats the air in the air preheating chamber 3. The ventilated infrared energy-saving cover actively impacts the flame, causing a strong reaction and generating infrared radiation, further improving the combustion efficiency and thermal efficiency. It is suitable for commercial cooking.

[0164] In one embodiment, if Fig.39 As shown, the gas appliance is an alcohol stove. The fuel alcohol enters the interior of the oil stove after being pressurized by gravity or external force, enters the lower part of the energy-saving cover upward, and is coiled and connected to the gas burner head downward. When in use, a small amount of alcohol fuel is needed to burn on the coil to preheat and vaporize the internal liquid alcohol. After starting, it can work continuously, and the flame size can be controlled by controlling the flow of alcohol entering. The burning flame after the gaseous alcohol is sprayed out impacts the infrared energy-saving cover, and the air in the preheating air preheating chamber 3 is heated, and the high-temperature reaction generates infrared rays. The flame gas flows through the coil and continues to heat the alcohol, so that the entire alcohol stove continues to operate.

[0165] Embodiment 11: A gas appliance, comprising a furnace body, comprising an infrared energy-saving cover 1 as in any one of Embodiments 1 to 9, wherein the infrared energy-saving cover 1 installed in the gas appliance in this embodiment is a flat plate structure, and correspondingly, the infrared generating cover 1 and the air preheating chamber 3 are both configured as flat plate structures. It also comprises a gas pipe 9, and a plurality of flame outlets 91 are provided on the gas pipe 9 along its length direction.

[0166] In one embodiment, if Fig.40 As shown, the gas appliance is an oven, an oven door 66 is provided on one side of the oven, an infrared energy-saving cover is provided at both the upper and lower ends of the inner side of the oven, and the infrared generating covers 1 of the two infrared energy-saving covers are both tilted. The top of the tilted infrared generating cover 1 is the high end, and the bottom of the tilted infrared generating cover is the bottom end, and a gas pipe 9 is provided at the bottom ends of the two infrared energy-saving covers. A flat pot 67 is provided at both the upper and lower ends of the oven, the flat pot 67 at the upper end is a mesh pot, and the pot at the lower end is a sheet pot.

[0167] In one embodiment, if Fig.41As shown, the gas appliance is a barbecue grill. In this embodiment, two groups of infrared energy-saving covers are provided, and the two groups are respectively located on the side walls of the barbecue grill. A flat pot 67 is provided on the side of the infrared generating cover 1 away from the air preheating chamber. The flat pot 67 in this embodiment is a mesh pot. The gas pipe 9 is provided at the bottom between the mesh pot and the infrared generating cover 1. In addition, an oil receiving pan 68 is provided at the bottom of the two infrared generating covers 1.

[0168] In one embodiment, if Fig.42 and Fig.43 The gas appliance shown is a fire cover teppanyaki, which includes two symmetrical and tilted infrared generating covers 1, which are in an "eight-shaped" shape with an upward opening; the gas pipe is arranged at the bottom between the two infrared generating covers 1. A flat pot 67 (such as Fig.43 ).

[0169] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. An infrared energy-saving cover, characterized in that: include: An infrared generating hood and a heat-insulating hood arranged outside the infrared generating hood; an air preheating chamber is arranged between the heat-insulating hood and the infrared generating hood; the air preheating chamber is provided with an air inlet passage connected with the outside air, and a plurality of air outlets are arranged through the infrared generating hood; air enters from the air inlet passage, passes through the air preheating chamber, and flows out from the air outlet.

2. The infrared energy-saving cover according to claim 1 is characterized in that: A plurality of layered plates distributed along the thickness direction are arranged in the air preheating chamber, and the plurality of layered plates divide the air preheating chamber into a plurality of partitioned chambers along the thickness direction; two ends of adjacent partitioned chambers are respectively connected in an interlaced manner to form a curved channel.

3. The infrared energy-saving cover according to claim 2 is characterized in that: A plurality of chamber partition plates are arranged in the partition chamber near the infrared generating cover, and the plurality of chamber partition plates are arranged in the vertical direction of the side wall of the partition chamber. The chamber partition plates divide the partition chamber into small air intake chambers. An air intake hole is arranged at one end of each small air intake chamber, and the other end is connected to at least one air outlet.

4. The infrared energy-saving cover according to claim 1 is characterized in that: The side wall of the infrared generating cover is provided with a plurality of protrusions, and the air outlets are arranged on the protrusions.

5. The infrared energy-saving cover according to claim 1 or 4, characterized in that: An air nozzle is arranged at the air outlet, and the air nozzle is a tubular structure.

6. According to the infrared energy-saving cover according to any one of claims 1 to 4, the infrared generating cover and the air preheating chamber are both annular structures.

7. The infrared energy-saving cover according to claim 6 is characterized in that: A plurality of partitions are arranged in the air preheating chamber along the circumferential direction of the axis of the infrared generating cover, and the partitions divide the air preheating chamber into a plurality of preheating small chambers along the circumferential direction of the axis of the infrared generating cover.

8. The infrared energy-saving cover according to claim 7 is characterized in that: The dividing block is spiral-shaped.

9. The infrared energy-saving cover according to any one of claims 1 to 4, wherein the infrared generating cover is a flat plate structure.

10. The infrared energy-saving cover according to any one of claims 1 to 4, characterized in that: An infrared auxiliary generating component is arranged inside the infrared generating cover, and the infrared auxiliary generating component includes the infrared auxiliary generating cover.

11. The infrared energy-saving cover according to any one of claims 1 to 4, characterized in that: It also includes a return air chamber, which is fitted with the air preheating chamber; a return air inlet connected to the return air chamber is arranged in the circumferential direction of the top of the infrared generating cover, and a return air outlet is arranged at one end of the return air chamber away from the return air inlet; the return air outlet is connected to the chimney.

12. A gas appliance, characterized in that: It comprises the infrared energy-saving cover as described in claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 10 or 11, and also comprises a burner head arranged in the middle position of the infrared generating cover.

13. A gas appliance, characterized in that: It comprises the infrared energy-saving cover as described in claim 1 or 2 or 3 or 4 or 5 or 9 or 10 or 11, the infrared energy-saving cover is a flat plate structure, and also comprises a tubular burner head.

14. A gas appliance according to claim 13, characterized in that: The infrared generator cover is arranged vertically; a mesh cooker is arranged on one side of the infrared generator cover away from the air preheating chamber; and a tubular burner is arranged at the bottom between the mesh cooker and the infrared generator cover.

15. The gas appliance according to claim 13, characterized in that: The infrared generating hood is arranged obliquely, and the tubular burner head is arranged at the lower end of the infrared generating hood.

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