Gas stove

Abstract

The invention provides a gas stove which comprises a burner, a pot rack, an injection pipe and a smoke recovery device, and the burner is provided with a gas mixing chamber; the pot frame is annularly arranged and forms a combustion cavity in a surrounding mode, the combustion cavity is used for allowing flame of the combustor to pass through, the pot frame is further provided with an upper surface facing the cooker, and the injection pipe is communicated with the gas mixing chamber; the smoke recovery device is provided with a smoke suction port and a smoke conveying channel which are communicated, the part, provided with the smoke suction port, of the smoke recovery device is located on the upper surface or located on the periphery of the pot frame and at least partially protrudes out of the upper surface upwards so as to be used for collecting smoke, and the smoke conveying channel is communicated with the injection pipe and used for conveying the smoke sucked by the smoke suction port into the injection pipe. The flue gas recovery device can collect high-temperature flue gas generated in the working process of the gas stove, and loss of heat energy is reduced by recovering waste heat of the high-temperature flue gas. And the heat of the high-temperature flue gas is reused for preheating gas and air, so that the heat efficiency of the whole gas stove is improved.

Description

Technical Field

[0001] This application relates to the technical field of kitchen appliances, and particularly to a gas stove. Background Art

[0002] A gas stove is one of the essential kitchen cooking utensils in daily family life. In order to pursue higher combustion thermal efficiency, some gas stoves adopt a pot support with a heat concentrating disk, and the form of the heat concentrating disk can be single-layer, double-layer or multi-layer. By using a pot support with a heat concentrating disk, the secondary air required for combustion can be separated from the high-temperature flue gas during combustion, so that the high-temperature flue gas during combustion is gathered in the heat concentrating disk, enhancing the heat energy exchange between the high-temperature flue gas and the bottom of the pot, reducing radiation and convective heat losses, and playing a role in gathering heat energy.

[0003] In the related art, although the heat concentrating pot support can concentrate heat to a certain extent, it still cannot gather all the high-temperature flue gas in the heat concentrating pot support. This results in a large amount of high-temperature flue gas being dissipated to the outside during combustion, not only causing waste of heat energy, but also reducing the overall thermal efficiency of the gas stove. Summary of the Invention

[0004] Embodiments of this application provide a gas stove, aiming to improve the problem of the overall thermal efficiency of the gas stove.

[0005] Embodiments of this application provide a gas stove, including:

[0006] A burner having a gas mixing chamber;

[0007] A pot support arranged in a ring shape and enclosing to form a combustion chamber for the flame of the burner to pass through, and the pot support also has an upper surface facing the cooking utensil;

[0008] An ejector pipe communicating with the gas mixing chamber; and

[0009] A flue gas recovery device having a smoke suction port and a smoke delivery channel connected to each other. The part of the flue gas recovery device having the smoke suction port is located on the upper surface or on the outer periphery of the pot support and at least partially protrudes upward from the upper surface for collecting flue gas, and the smoke delivery channel is connected to the ejector pipe for delivering the flue gas sucked by the smoke suction port into the ejector pipe.

[0010] In some of these embodiments, the flue gas recovery device includes:

[0011] A smoke collecting member having the smoke suction port, located on the upper surface or on the outer periphery of the pot support and at least partially protruding upward from the upper surface; and

[0012] A smoke delivery pipe connected to the smoke collecting member and the ejector pipe and having the smoke delivery channel, and the smoke delivery pipe is located outside the pot support.

[0013] In some of these embodiments, the ejector tube includes:

[0014] An ejector section having a Venturi channel, the ejector section being configured to accelerate the ejection of the fuel gas to generate a low-pressure area and attract the entry of the surrounding primary air; and

[0015] A mixing section, connected to the downstream of the ejector section along the flow direction of the fuel gas, the mixing section being configured to mix the fuel gas and the primary air;

[0016] Wherein, the smoke delivery pipe is connected to at least one of the mixing section and the ejector section.

[0017] In some of these embodiments, the ejector tube includes a first ejector tube and a second ejector tube. The outlet ends of the first ejector tube and the second ejector tube are both in communication with the gas mixing chamber, and the smoke delivery pipe is connected to the first ejector tube and / or the second ejector tube.

[0018] In some of these embodiments, the ejector tube includes a first ejector tube and a second ejector tube, and the gas mixing chamber includes a first gas mixing chamber and a second gas mixing chamber; the burner includes:

[0019] A burner head;

[0020] A central fire cap, covering the burner head and defining the first gas mixing chamber with the burner head; and

[0021] An outer fire cap, spaced outside the central fire cap and defining the second gas mixing chamber with the burner head;

[0022] Wherein, the first ejector tube is in communication with the first gas mixing chamber, the second ejector tube is in communication with the second gas mixing chamber, and the smoke delivery pipe is connected to the first ejector tube and / or the second ejector tube.

[0023] In some of these embodiments, the smoke delivery pipe includes:

[0024] A main smoke delivery pipe, connected and in communication with the smoke collecting member; and,

[0025] Two smoke delivery branch pipes, both connected and in communication with the main smoke delivery pipe, the two smoke delivery branch pipes being arranged at an angle and respectively in communication with the first ejector tube and the second ejector tube.

[0026] In some of these embodiments, the first ejector tube and the second ejector tube are arranged in parallel; the smoke delivery pipe includes:

[0027] A main smoke delivery pipe, connected to the smoke collecting member; and

[0028] A diffuser tube is connected to the end of the main smoke delivery pipe facing away from the smoke collecting member. The diffuser tube has an air delivery outlet communicating with the smoke delivery channel, and the air delivery outlet is arranged towards the intake ends of the first ejector tube and the second ejector tube.

[0029] Wherein, the diffuser tube is in a horn shape that gradually expands towards the first ejector tube and the second ejector tube.

[0030] In some embodiments, the diffuser tube has gas holes, and the gas stove further includes:

[0031] A gas pipe is inserted through the gas holes, and the gas pipe is used to supply gas to the first ejector tube and the second ejector tube.

[0032] In some embodiments, the pot support includes:

[0033] An upper cover, having the upper surface; and

[0034] A lower cover, connected to the upper cover and located below the upper cover, and a heat insulation cavity is formed between the lower cover and the upper cover;

[0035] Wherein, the smoke collecting member is in a ring shape, is arranged around the circumferential side wall of the upper cover and at least partially protrudes upward from the upper surface, and a plurality of smoke suction ports are provided, and the plurality of smoke suction ports are arranged at intervals along the circumferential direction of the smoke collecting member.

[0036] In some embodiments, the inner diameter of the smoke collecting member is D1, the outer diameter of the upper cover is D2, and D1 and D2 satisfy: 0 ≤ D1 - D2 ≤ 20 mm.

[0037] In some embodiments, a plurality of the smoke suction ports are located on the side of the smoke collecting member facing the combustion chamber; and / or

[0038] The smoke suction port is located above the upper surface.

[0039] In some embodiments, the flue gas recovery device further includes:

[0040] A power device, arranged in the smoke delivery pipe, and the power device is used to drive the flue gas and air to enter the smoke delivery channel from the smoke suction port and be input into the ejector tube.

[0041] In some embodiments, the flue gas recovery device further includes:

[0042] The air supplementing component is located on the lower side of the lower layer cover and is connected to the smoke delivery pipe. The air supplementing component has a first air supplementing port facing the combustion chamber, and the first air supplementing port is communicated with the smoke delivery channel so that the smoke flowing out from the first air supplementing port preheats the secondary air flowing towards the combustion chamber.

[0043] In some embodiments thereof, the air supplementing component satisfies at least one of the following conditions:

[0044] The air supplementing component is annular, and a plurality of the first air supplementing ports are provided. The plurality of first air supplementing ports are arranged at intervals on the side of the air supplementing component facing the combustion chamber;

[0045] The diameter of the air supplementing component is greater than the inner diameter of the lower layer cover;

[0046] The air supplementing component is connected to the lower surface of the lower layer cover.

[0047] In some embodiments thereof, the flue gas recovery device further includes:

[0048] A filter element, which is detachably connected to the smoke delivery pipe and partially located in the smoke delivery channel. The filter element is used for filtering the smoke flowing towards the ejector pipe.

[0049] In the ejector pipe in the embodiments of the present application, when gas passes through the ejector pipe, due to the high-speed flow of the gas, a negative pressure area will be generated at the inlet of the ejector pipe. This negative pressure area will attract the surrounding air into the ejector pipe, mix with the gas to form a mixed gas, and then be transported to the gas mixing chamber. In this embodiment, a flue gas recovery device is provided, which can transport high-temperature flue gas into the ejector pipe, that is, preheat the gas and air in the ejector pipe through the high-temperature flue gas. The temperature of the preheated gas and air mixed gas increases, and the combustion reaction speed accelerates, thereby improving the combustion efficiency. Moreover, the preheated mixed gas burns more stably, reducing the fluctuations during the combustion process and improving the combustion stability.

[0050] The flue gas recovery device in this embodiment can collect the high-temperature flue gas generated during the operation of the gas stove. By recovering the waste heat of the high-temperature flue gas, the loss of heat energy is reduced. The heat of the high-temperature flue gas is reused to preheat the gas and air, thereby improving the thermal efficiency of the entire gas stove. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0052] Figure 1 Structural schematic diagram of a gas stove provided by an embodiment of the present application;

[0053] Figure 2 Structural schematic diagram of a flue gas recovery device connected to an ejector tube provided by an embodiment of the present application;

[0054] Figure 3 Structural schematic diagram of a flue gas recovery device connected to an ejector tube provided by another embodiment of the present application;

[0055] Figure 4 For Figure 2 Exploded structural schematic diagram of the flue gas recovery device shown connected to the ejector tube;

[0056] Figure 5 For Figure 2 Another exploded structural schematic diagram of the flue gas recovery device shown connected to the ejector tube;

[0057] Figure 6 Structural schematic diagram of a flue gas recovery device provided by an embodiment of the present application;

[0058] Figure 7 Structural schematic diagram of a flue gas recovery device connected to a gas pipe provided by an embodiment of the present application;

[0059] Figure 8 Structural schematic diagram of a flue gas recovery device provided by an embodiment of the present application for supplementing secondary air;

[0060] Figure 9 For Figure 8 Exploded structural schematic diagram of the flue gas recovery device shown for supplementing secondary air;

[0061] Figure 10 Exploded structural schematic diagram of an air supplementing component provided by an embodiment of the present application;

[0062] Figure 11 Structural schematic diagram of a flue gas recovery device connected to a mixing chamber provided by an embodiment of the present application.

[0063] Explanation of reference numerals:

[0064] 1. Gas stove; 10. Pot rack; 11. Pot rack body; 11a. Combustion chamber; 11b. Heat insulation chamber; 111. Upper cover; 111a. Upper surface; 113. Lower cover; 113a. Lower surface; 12. Flue gas recovery device; 121. Smoke collection part; 121a. Smoke suction port; 122. Smoke delivery pipe; 122a. Smoke delivery channel; 1221. Smoke delivery main pipe; 1222. Smoke delivery branch pipe; 1223. Diffusion pipe; 1223a. Air delivery outlet; 1223b. Gas hole; 123. Air supplement part; 123a. First air supplement port; 123b. Inner cavity; 123c. Air supplement swirl channel; 1231. Ring body; 1232. Air supplement swirl part; 124. Power device; 13. Liquid receiving tray; 14. Upper support foot; 15. Lower support foot; 20. Burner; 20a. Gas mixing chamber; 20a1. First gas mixing chamber; 20a2. Second gas mixing chamber; 21. Burner cap; 211. Central burner cap; 212. Outer burner cap; 22. Divider; 23. Base; 231. Base body; 30. Ejector pipe; 31. First ejector pipe; 32. Second ejector pipe; 33. Ejector section; 34. Mixing section; 40. Gas pipe; 41. Inner gas pipe; 42. Outer gas pipe. Detailed implementation manners

[0065] In order to make the objectives, technical solutions and advantages of this application clearer, the following further details this application in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0066] As Figure 1 shown, the gas stove 1 is a common kitchen appliance that generates flames by burning gases such as natural gas and liquefied petroleum gas for cooking food. The gas stove 1 has been widely used in household and commercial kitchens due to its high efficiency and convenience.

[0067] As Figure 2 and Figure 4As shown in the figure, the gas stove 1 includes a burner 20, a pot stand 10, and an ejector tube 30. The burner 20 is the core component of the gas stove 1. The burner 20 has a mixing chamber 20a, where gas and air can be mixed and then burned. The pot stand 10 is arranged in a ring shape and encloses a combustion chamber 11a. Specifically, the pot stand 10 can be circular or square-ring-shaped. The circular pot stand 10 can better adapt to the shape of circular cookware, making the heat more evenly distributed around the bottom of the pot. When the diameter of the circular pot stand 10 is equal to the side length of the square-ring-shaped pot stand 10, the area of the square-ring-shaped pot stand 10 is larger, so it can provide a larger area for heating cookware and has a higher thermal efficiency. The combustion chamber 11a is used for the flame of the burner 20 to pass through. Understandably, the pot stand 10 is mounted on the outer periphery of the burner 20, with the burner 20 arranged in the middle. The pot stand 10 can provide stable support for the cookware, and the flame of the burner 20 can directly act on the bottom of the cookware to provide heat energy for the cookware.

[0068] The main function of the ejector tube 30 is to generate negative pressure through the Venturi effect, suck in air and mix it with gas to form a mixed gas suitable for combustion. When the gas passes through the narrow channel of the ejector tube 30, the flow rate increases and the pressure decreases, thus generating a negative pressure area at the entrance of the ejector tube 30. This negative pressure area will attract the surrounding air into the ejector tube 30, and after mixing with the gas, a mixed gas is formed. The ejector tube 30 is connected to the mixing chamber 20a and can transport air and gas to the mixing chamber 20a.

[0069] Although the pot stand 10 has a certain effect of concentrating heat, it still cannot collect all the high-temperature flue gas within the pot stand 10. This results in a large amount of high-temperature flue gas being lost to the outside during the combustion process, not only causing waste of heat energy but also reducing the overall thermal efficiency of the gas stove 1.

[0070] Please continue to refer to Figure 2 and Figure 4 , to solve the above problems, the gas stove 1 further includes a flue gas recovery device 12. The flue gas recovery device 12 has a smoke suction port 121a and a smoke delivery channel 122a that are connected. The pot stand 10 has an upper surface 111a facing the cookware. It should be noted that this upper surface 111a plays a certain role in heat conduction. The upper surface 111a is arranged approximately opposite to the bottom of the cookware and can assist in the heating process of the cookware by means of heat radiation. The upper surface 111a also has a multi-ring annular groove structure, which helps to guide the flow direction of the flue gas, making the flue gas converge on the upper surface 111a of the pot stand 10 and extending the contact time between the flue gas and the bottom of the cookware.

[0071] Part of the flue gas recovery device 12 having a smoke suction port 121a is located on the upper surface 111a or on the outer periphery of the pot stand 10 and at least partially protrudes upward from the upper surface 111a. Specifically, in one configuration, the part of the flue gas recovery device 12 having a smoke suction port 121a is located on the upper surface 111a of the pot stand 10, which can reduce the mixing of high-temperature flue gas with the outside air before reaching the smoke suction port 121a, thereby increasing the temperature of the recovered flue gas and enhancing the preheating effect. And the part having the smoke suction port 121a is located on the upper surface 111a of the pot stand 10, making the structure between the flue gas recovery device 12 and the pot stand 10 more compact, saving space, and being suitable for installation in a kitchen environment with limited space. In another configuration, the part of the flue gas recovery device 12 having a smoke suction port 121a is located on the outer periphery of the pot stand 10 and at least partially protrudes upward from the upper surface 111a of the pot stand 10. This configuration enables the smoke suction port 121a to collect the dissipated high-temperature flue gas from the outer peripheral side of the pot stand 10, and the range of the collected flue gas is larger. It can not only collect the flue gas dissipated from the edge of the cooking utensil, but also collect the flue gas dissipated from around the pot stand 10, improving the recovery range of the flue gas. The appropriate configuration can be selected according to actual usage requirements.

[0072] Whether the part having the smoke suction port 121a is located on the upper surface 111a or on the outer periphery of the pot stand 10 and at least partially protrudes upward from the upper surface 111a, the smoke suction port 121a can directly contact the high-temperature flue gas generated during the combustion process, thereby effectively recovering it, that is, the smoke suction port 121a is used to collect the flue gas. And the smoke delivery channel 122a is communicated with the ejector tube 30. Understandably, the smoke delivery channel 122a is a channel connecting the smoke suction port 121a and the ejector tube 30. Due to the setting of the smoke suction port 121a close to the upper surface 111a of the pot stand 10, and the mixing chamber 20a is located below the burner 20, and the ejector tube 30 is usually located below the burner 20. Therefore, the smoke delivery channel 122a extends at least partially downward from the position where it is communicated with the smoke suction port 121a, reducing the circuitous setting of the smoke delivery channel 122a, shortening the flue gas delivery path, enabling the flue gas to flow smoothly from the smoke suction port 121a to the ejector tube 30, and reducing the problems of flue gas accumulation or poor flow in the smoke delivery channel 122a. Ensure that the flue gas can quickly and efficiently enter the ejector tube 30 after entering the smoke delivery channel 122a, reducing the heat loss of the flue gas in the moving path and helping to maintain the high-temperature state of the flue gas.

[0073] The function of the smoke delivery channel 122a is to convey the high-temperature flue gas inhaled through the smoke intake 121a into the ejector tube 30. By collecting the high-temperature flue gas through the smoke intake 121a, the loss of the high-temperature flue gas is reduced, and the recovery and utilization of the heat of the high-temperature flue gas are also realized. After the high-temperature flue gas enters the ejector tube 30 through the smoke delivery channel 122a, it can preheat the fuel gas and air, thereby increasing the temperature of the fuel gas and air, reducing the heat input required during the combustion process, that is, it is easier for the fuel gas and air to reach the temperature conditions required for combustion during combustion, enabling them to burn more fully and stably, and thus improving the combustion efficiency.

[0074] The fuel gas and air in the ejector tube 30 are preheated by the high-temperature flue gas. The temperature of the preheated fuel gas and air mixture increases, and the combustion reaction rate speeds up, thereby improving the combustion efficiency. Moreover, the preheated mixture burns more stably, reducing the fluctuations during the combustion process and improving the combustion stability. And there will be unburned fuel gas components in the flue gas. The smoke intake 121a recovers the flue gas and enables it to participate in the combustion process again, which can improve the energy utilization rate.

[0075] As Figure 2 and Figure 3 shown, in some embodiments, the ejector tube 30 includes an ejector section 33 and a mixing section 34. The ejector section 33 belongs to the front part of the ejector tube 30. The ejector section 33 has a Venturi channel, that is, the middle part of the ejector section 33 is narrow and the two ends are wide. When the fuel gas passes through the narrow part, the flow rate increases and the pressure decreases, thereby generating a negative pressure. The ejector section 33 is used to accelerate the ejection of the fuel gas to generate a low-pressure area and attract the entry of the surrounding primary air. Along the flow direction of the fuel gas, the mixing section 34 is connected downstream of the ejector section 33. The mixing section 34 is used to mix the fuel gas and the primary air. The mixing section 34 can be a relatively long pipe, and vortex plates or turbulators can be arranged inside to increase the turbulence of the gas and further promote the mixing of the fuel gas and air. The outlet of the mixing section 34 is connected to the gas mixing chamber 20a to convey the mixed gas to the burner 20.

[0076] Among them, the smoke delivery pipe 122 is connected to at least one of the mixing section 34 and the ejector section 33. Understandably, the smoke delivery pipe 122 can be only connected to the mixing section 34 (such as Figure 3 ), preheating the fuel gas and air during the mixing process, increasing the temperature of the mixed gas, accelerating the combustion reaction rate, making the preheated mixed gas burn more fully, and reducing the possibility of incomplete combustion. The smoke delivery pipe 122 can also be only connected to the ejector section 33 (such as Figure 2) That is to say, the high-temperature flue gas in the flue gas delivery channel 122a can be accelerated when passing through the Venturi channel, increasing the kinetic energy of the high-temperature flue gas. The inflow speed and efficiency of the high-temperature flue gas are higher, enabling it to enter the inside of the ejector tube 30 more quickly and fully mix with the gas and air. And because it is connected to the front section of the ejector tube 30, its movement path is longer, that is, there is more time for the gas and air to mix, further obtaining a more uniform mixed gas, further optimizing the combustion conditions, making the mixed gas more stable during combustion, and being able to more comprehensively optimize the combustion process. The flue gas delivery pipe 122 is connected to both the mixing section 34 and the ejector section 33, combining the advantages of the above two connection methods, capable of achieving a more efficient and optimized combustion process, and can adjust the distribution ratio of the high-temperature flue gas according to different combustion requirements, which will not be elaborated here.

[0077] Please continue to refer to Figure 2 and Figure 3 , in some embodiments, the pot rack 10 includes a pot rack body 11, upper support feet 14 and lower support feet 15. The pot rack body 11 has the above-mentioned combustion chamber 11a and upper surface 111a. The upper support feet 14 are connected to the upper surface 111a of the pot rack body 11 for carrying cookware, preventing the cookware from sliding or tipping during heating, reducing the occurrence of accidents, and ensuring the stability during the cooking process. The upper support feet 14 can be made of materials with high temperature resistance such as cast iron.

[0078] There are multiple upper support feet 14, and the multiple upper support feet 14 are arranged at intervals on the upper surface 111a of the pot rack body 11. The lower support feet 15 are connected to the pot rack body 11 and are located at the lower part of the pot rack body 11. The lower support feet 15 are used to provide support for the pot rack body 11. The connection methods of the upper support feet 14, the lower support feet 15 and the pot rack body 11 include at least one of screwing, welding, riveting and clamping, making them form a firm connection. The lower support feet 15 enable the pot rack body 11 to be placed stably around the burner 20. Among them, the number of the lower support feet 15 is the same as that of the upper support feet 14, and they are arranged in one-to-one correspondence in the up and down direction, which can ensure that the supporting force of the pot rack body 11 in the vertical direction is evenly distributed, reducing the structural instability and shaking caused by the inconsistent positions of the upper support feet 14 and the lower support feet 15. The aligned upper support feet 14 and lower support feet 15 can more effectively transfer the weight of the cookware to the lower support feet 15, improving the overall load-bearing capacity of the pot rack body 11 and ensuring that the pot rack body 11 will not be deformed or damaged due to the weight of the cookware during use.

[0079] Such as Figure 3As shown, in some embodiments, the pot stand 10 further includes a liquid receiving tray 13. The liquid receiving tray 13 is arranged in a ring shape and is detachably sleeved on the circumference of the burner 20. The lower support feet 15 of the pot stand 10 are supported on the liquid receiving tray 13. The liquid receiving tray 13 can collect the liquids generated during the cooking process of the gas stove 1, such as soup, oil, etc., prevent the liquids from overflowing on a large scale, and keep the gas stove 1 clean and hygienic.

[0080] It should be noted that the liquid receiving tray 13 is sleeved under the fire outlet side of the burner 20, which can prevent the flame of the burner 20 from directly contacting the liquid receiving tray 13, thus avoiding safety accidents such as fires. The liquid receiving tray 13 can be removed for cleaning, improving the convenience of use.

[0081] Such as Figure 4 and Figure 5 As shown, in some embodiments, the pot stand body 11 includes an upper cover 111 and a lower cover 113. Both the upper cover 111 and the lower cover 113 are in a ring shape. The lower cover 113 is connected to the upper cover 111 and is located below the upper cover 111. The upper cover 111 has the above-mentioned upper surface 111a. An insulation cavity 11b is formed between the upper cover 111 and the lower cover 113. The insulation cavity 11b can reduce the heat transfer from the pot stand 10 to the external environment. This design is to reduce the heat loss and make more heat concentrated at the bottom of the cooking utensil. Further, heat insulation materials can also be filled in the insulation cavity 11b to enhance the heat insulation effect. The heat insulation materials can specifically be one of heat insulation cotton, aerogel, and foam plastics.

[0082] In other embodiments, the pot stand 10 further includes a middle cover (not shown in the figure). The middle cover is arranged between the upper cover 111 and the lower cover 113. The middle cover divides the insulation cavity 11b into a first cavity and a second cavity. The first cavity is arranged on the side of the middle cover facing the upper cover 111, and the second cavity is arranged on the side of the middle cover facing the lower cover 113. A heat insulation layer can be arranged on the surface of the middle cover. The heat insulation layer is used to reduce the heat transfer from the first cavity to the second cavity, so that the heat dissipation of the upper cover 111 is slower, and the upper cover 111 can maintain a higher temperature to improve the overall thermal efficiency of the gas stove 1.

[0083] Such as Figure 2 and Figure 3As shown, in some embodiments, the flue gas recovery device 12 includes a smoke collecting member 121 and a smoke delivery pipe 122. The smoke collecting member 121 has the above-mentioned smoke suction port 121a. The smoke collecting member 121 is located on the upper surface 111a of the pot stand 10 or is located outside the pot stand 10 and at least partially protrudes upward from the upper surface 111a of the pot stand 10. The smoke suction port 121a can be arranged on the part of the smoke collecting member 121 that protrudes from the upper surface 111a of the pot stand 10, reducing the interference or path of the recovered flue gas, so that the smoke suction port 121a is arranged at a position close to the flue gas source, and can collect the high-temperature flue gas dissipated from the periphery of the pot stand 10 more directly. That is, the smoke collecting member 121 is used to collect the high-temperature flue gas dissipated from around the pot stand 10 and the cooking utensil.

[0084] One end of the smoke delivery pipe 122 is connected to the smoke collecting member 121 and extends in the direction of the ejector pipe 30 to connect to the ejector pipe 30, and has the above-mentioned smoke delivery channel 122a. The arrangement of the smoke delivery pipe 122 can reduce the heat loss of the high-temperature flue gas during the transportation process. And the smoke delivery pipe 122 is located outside the pot stand 10, which can reduce the interference between the smoke delivery pipe 122 and the pot stand 10 and reduce the occupation of the internal space of the pot stand 10.

[0085] In some embodiments, the smoke collecting member 121 may have a Venturi channel. The smoke suction port 121a is the inlet of the Venturi channel. Along the flow direction of the flue gas, the inlet part gradually narrows, the flow velocity increases, and the pressure decreases. The Venturi channel also has a throat and an outlet part. The throat is the narrowest part, so that the flow velocity of the flue gas reaches the maximum, forming a negative pressure area, and the outlet part gradually widens and the pressure recovers. The outlet part can be connected to the smoke delivery pipe 122. The inlet part of the smoke collecting member 121 provided with the Venturi channel is arranged on the moving path of the high-temperature flue gas, so that the high-temperature flue gas can smoothly enter the inlet, and the high-temperature flue gas can be naturally inhaled by using the Venturi effect without an additional power device 124.

[0086] Among them, both the smoke collecting member 121 and the smoke delivery pipe 122 are made of stainless steel, which can remain stable in a high-temperature environment, are not easily deformed or damaged. And they have good corrosion resistance and can resist the chemical components in the flue gas. The stainless steel smoke collecting member 121 and the stainless steel smoke delivery pipe 122 have relatively high mechanical strength, can withstand a certain amount of mechanical stress, and maintain the stability of the structure. Their surfaces are smooth, easy to clean and maintain, and can reduce dirt accumulation. In other embodiments, the smoke collecting member 121 and the smoke delivery pipe 122 can also be made of ceramic materials or high-temperature resistant plastics. This application does not limit this.

[0087] Please continue to refer to Figure 2 and Figure 3In some embodiments, the smoke collecting member 121 is annular, annularly arranged on the peripheral side wall of the upper cover 111 and at least partially protruding upward from the upper surface 111a. The smoke collecting member 121 can be welded to the peripheral side wall of the upper cover 111 to ensure the sealing of the connection between the smoke collecting member 121 and the upper cover 111, reduce the high-temperature smoke from overflowing through the gap between the smoke collecting member 121 and the upper cover 111, and reduce the heat loss. The smoke collecting member 121 is firmly connected to the upper cover 111, maintaining the stability of the structure during long-term use, reducing looseness or damage caused by vibration or external force, and also reducing the noise generated by unstable connection during use.

[0088] Specifically, multiple inhalation ports 121a may be provided, and multiple inhalation ports 121a are spaced and evenly arranged along the circumference of the smoke collecting member 121, so as to more comprehensively collect the high-temperature smoke lost from around the pot rack 10. This design allows the smoke to be effectively sucked into the inhalation port 121a regardless of the direction from which it is lost, thereby reducing the leakage of smoke. It can be understood that the smoke collecting member 121 is a hollow annular tube structure, and the smoke can flow freely inside it. The smoke delivery pipe 122 is connected to one side of the smoke collecting member 121. The high-temperature smoke entering from the inhalation port 121a converges in the smoke collecting member 121 and flows into the smoke delivery channel 122a, and is finally delivered to the ejector pipe 30 to preheat the gas and air.

[0089] Furthermore, in some embodiments, a plurality of inhalation ports 121a are located on the side of the smoke collecting member 121 facing the combustion chamber 11a. Specifically, the axial direction of the inhalation ports 121a is perpendicular to the axial direction of the combustion chamber 11a, so that the inhalation ports 121a are closer to the source of the high-temperature smoke, and the inhalation ports 121a can more directly collect the high-temperature smoke lost from around the pot rack 10. The high-temperature smoke has a shorter contact time with the external environment before being sucked into the inhalation ports 121a, reducing heat loss.

[0090] In other embodiments, the axial direction of the smoking port 121a may also be set at an angle to the axial direction of the combustion chamber 11a, but it will not be set on the side of the smoke collecting piece 121 away from the combustion chamber 11a. The axial angle between it and the combustion chamber 11a can be set according to needs. Assuming that the smoking port 121a is set on the side of the smoke collecting piece 121 away from the combustion chamber 11a, the movement path of the smoke is increased, and the contact time of the smoke with the external environment is prolonged, resulting in more heat loss.

[0091] In some embodiments, the smoking port 121a is located above the upper surface 111a. It should be noted that the smoke collecting member 121 at least partially protrudes upward from the upper surface 111a, but the height of the protruding part is still lower than the top of the upper support leg 14. The smoke collecting member 121 can effectively collect the high-temperature flue gas without interfering with the bottom of the cooking utensil. The smoking port 121a is arranged on the part of the smoke collecting member 121 that protrudes from the upper surface 111a, so that the smoking port 121a can be closer to the flue gas dissipation path and collect the flue gas dissipated from the edge of the pot rack 10 more comprehensively.

[0092] As Figure 9 shown, in some embodiments, the inner diameter of the smoke collecting member 121 is D1, and the outer diameter of the upper layer cover 111 is D2. D1 and D2 satisfy: 0 ≤ D1 - D2 ≤ 20 mm. The smoke collecting member 121 can be tightly arranged around the upper layer cover 111. A smaller gap can reduce the leakage of flue gas from the gap between the smoke collecting member 121 and the upper layer cover 111, ensuring that more flue gas can be effectively collected and transported to the ejector pipe 30. If the difference between the inner diameter of the smoke collecting member 121 and the outer diameter of the upper layer cover 111 is too large, for example, greater than 2 cm, this will cause more flue gas to leak from the gap, reducing the flue gas recovery efficiency. And the flue gas has a longer contact time with the external environment before flowing to the smoking port 121a, resulting in the loss of heat of the high-temperature flue gas. If the inner diameter of the smoke collecting member 121 is smaller than the outer diameter of the upper layer cover 111, it will cause the premature inhalation of high-temperature flue gas, and the high-temperature flue gas will be sucked away by the smoking port 121a before fully contacting the bottom of the cooking utensil. If the high-temperature flue gas is prematurely inhaled into the smoking port 121a, the heating time at the bottom of the cooking utensil will be reduced, resulting in a decrease in the heat transfer efficiency. Therefore, the inner diameter of the smoke collecting member 121 being larger than the outer diameter of the upper layer cover 111 can ensure that the high-temperature flue gas has enough time to fully contact the bottom of the cooking utensil.

[0093] As Figure 4 and Figure 5 shown, in order to effectively drive the high-temperature flue gas to enter the smoke delivery channel 122a from the smoking port 121a, in some embodiments, the flue gas recovery device 12 further includes a power device 124. The power device 124 is arranged in the smoke delivery pipe 122. The power device 124 is used to drive the flue gas and air to enter the smoke delivery channel 122a from the smoking port 121a and input them into the ejector pipe 30. Understandably, the power device 124 can generate negative pressure, enabling the smoking port 121a to efficiently inhale the high-temperature flue gas and air, ensuring that the flue gas can smoothly enter the smoke delivery channel 122a and be transported to the ejector pipe 30, increasing the speed of the flue gas entering the ejector pipe 30 and reducing the heat loss of the flue gas during the transportation process.

[0094] Moreover, the power device 124 generates negative pressure through the smoke delivery channel 122a. At this time, the pressure inside the ejector tube 30 is usually higher than that inside the smoke delivery channel 122a, reducing the reverse flow of the gas and air inside the ejector tube 30 into the smoke delivery channel 122a.

[0095] It should be noted that the power device 124 sucks the air near the smoking port 121a and the high-temperature flue gas into the smoke delivery channel 122a together, enabling the smoke delivery pipe 122 to input primary air into the ejector tube 30 at the same time, supplementing more primary air, so that the air and gas can be more fully mixed before entering the mixing chamber 20a, and the two can be mixed more evenly. And more uniform mixing helps the gas to burn more fully in the burner 20, reducing the unburned gas components and reducing pollutant emissions. Moreover, the high-temperature flue gas can also preheat the temperature of the air sucked by the power device 124 in advance, enabling the mixed gas to reach a higher temperature when entering the mixing chamber 20a, thereby improving the combustion efficiency.

[0096] Specifically, in this embodiment, the power device 124 can be a fan. The air inlet of the fan is arranged facing the connection part of the smoke collection ring and the smoke delivery pipe 122, and the air outlet of the fan is arranged facing the ejector tube 30. The fan can generate negative pressure through the rotating blades, thereby effectively sucking the high-temperature flue gas and air. Moreover, the fan can also control the flow rate of the sucked air and high-temperature flue gas by adjusting its rotation speed. When the rotation speed of the fan increases, it can suck the air and high-temperature flue gas near the smoking port 121a more quickly, resulting in an increase in the flow rate of the air and high-temperature flue gas; conversely, when the rotation speed of the fan decreases, the flow rate of the air and high-temperature flue gas will also decrease accordingly. In other embodiments, the power device 124 can also be a vacuum pump, a Venturi tube or an electromagnetic pump.

[0097] In some embodiments, the smoke delivery pipe 122 further has an air suction port (not shown in the figure) communicating with the smoke delivery channel 122a. The air suction port is arranged on the pipe wall of the smoke delivery pipe 122, and along the flow direction of the flue gas in the smoke delivery channel 122a, the power device 124 is arranged downstream of the air suction port, which can effectively increase the inhaled air content and improve the air content in the mixed gas of air and high-temperature flue gas. Moreover, the inhaled air can be fully mixed with the high-temperature flue gas in advance and preheated by the high-temperature flue gas. Increasing the air content can reduce the fluctuations during the combustion process, making the combustion more stable, and more uniform mixing can reduce the phenomenon of incomplete combustion, thereby reducing pollutant emissions.

[0098] In some embodiments, the flue gas recovery device 12 further includes a check valve (not shown in the figure). The check valve is disposed in the smoke delivery pipe 122, and the valve of the check valve is arranged towards the direction of the ejector pipe 30. It is used to block the gas and air in the ejector pipe 30 from flowing into the smoke collecting member 121 through the smoke delivery pipe 122, ensuring that the high-temperature flue gas and air mixture can flow unidirectionally and preventing the gas and air in the ejector pipe 30 from flowing into the smoke collecting member 121. This improves the safety of the gas stove 1. If the gas overflows from the smoke intake 121a, it may cause combustion leakage.

[0099] In some embodiments, the flue gas recovery device 12 further includes a filter element (not shown in the figure). The filter element is detachably connected to the smoke delivery pipe 122. The detachable filter element can be replaced and cleaned regularly, which is convenient for users to maintain. And a part of the filter element is located in the smoke delivery channel 122a. The filter element is used to filter the flue gas flowing towards the ejector pipe 30. Particles and impurities in the flue gas may accumulate in the ejector pipe 30, resulting in blockage of the ejector pipe 30. The setting of the filter element can effectively remove these particles and prevent the ejector pipe 30 from being blocked. The setting of the filter element can provide purer preheated gas to the ejector pipe 30, which helps to improve the preheating efficiency of the gas and air and further optimize the combustion process.

[0100] Specifically, the filter element can be a multi-stage filter element to improve the filtering effect. For example, the first-stage filter can remove large particles, and the second-stage filter can remove harmful gases. Further, regarding the method of detachably connecting the filter element to the smoke delivery pipe 122, the smoke delivery pipe 122 can be a multi-section structure, that is, it includes at least two smoke delivery sub-sections. The filter element is connected between the two smoke delivery sub-sections. At least two ends of the filter element have external threads, and the smoke delivery sub-section connected to the end of the filter element has internal threads. By means of threaded connection, a part of the filter element is located in the smoke delivery channel 122a to filter the flowing flue gas.

[0101] In some embodiments, the ejector pipe 30 includes a first ejector pipe 31 and a second ejector pipe 32. The setting of the first ejector pipe 31 and the second ejector pipe 32 can increase the total amount of the mixed gas and further optimize the combustion conditions. And it enhances the ejector capacity of the gas stove 1, ensuring sufficient air supply during the combustion process, so as to achieve more complete combustion.

[0102] Such as Figure 5As shown, the first ejector tube 31 and the second ejector tube 32 can be arranged in parallel and substantially parallel, or at an angle. The outlet ends of the first ejector tube 31 and the second ejector tube 32 are both connected to the gas mixing chamber 20a. The smoke delivery pipe 122 is connected to the first ejector tube 31 and / or the second ejector tube 32. That is, the smoke delivery pipe 122 can be only connected to the first ejector tube 31, or only connected to the second ejector tube 32. This setting can simplify the connection method and reduce costs. Connecting the smoke delivery pipe 122 to only the first ejector tube 31 or the second ejector tube 32 can also improve the combustion efficiency. It is possible to select the appropriate first ejector tube 31 or second ejector tube 32 to connect according to the specific positions of the first ejector tube 31 and the second ejector tube 32. For example, in one configuration, the first ejector tube 31 with a layout position closer to the smoke delivery pipe 122 is used as the connection object. Or the smoke delivery pipe 122 is connected to both the first ejector tube 31 and the second ejector tube 32 at the same time, and by introducing high-temperature flue gas into the first ejector tube 31 and the second ejector tube 32 respectively, the combustion efficiency is maximized.

[0103] In other embodiments, the ejector tube 30 further includes a third ejector tube, a fourth ejector tube, etc., which can introduce more mixed gas of air and gas. The smoke delivery pipe 122 can be connected to the third ejector tube and / or the fourth ejector tube according to requirements, which will not be elaborated here. The present application does not limit the specific number of ejector tubes.

[0104] Please continue to refer to Figure 5 , in some embodiments, the burner 20 includes a base 23, a burner cap 21 and a gas distributor 22. The function of the base 23 is to mix gas and primary air. The gas distributor 22 is arranged between the base 23 and the burner cap 21 and serves to distribute gas. And there are many fire holes on the burner cap 21 for distributing the mixed gas to each fire hole. The base 23 and the burner cap 21 can be made of aluminum alloy, and their surfaces are both anodized to improve the corrosion resistance of the base 23 and the burner cap 21 and protect the base 23 and the burner cap 21 stably for a long time.

[0105] The premixing chamber 20a includes a first premixing chamber 20a1 and a second premixing chamber 20a2. The base 23 includes a base body 231. The base body 231 is connected and communicated with the ejector tube 30. The base body 231 and the ejector tube 30 can be an integral component. The burner head 22 is arranged on the upper side of the base body 231. The ejector tube 30 is communicated with the burner cap 21 through the burner head 22. The burner head 22 has a central burner cap seat and an outer ring gas chamber. The burner cap 21 includes a central burner cap 211 and an outer burner cap 212. The central burner cap 211 is located at the central position of the burner 20 and covers the burner head 22, and together with the burner head 22, it constructs the first premixing chamber. Specifically, the central burner cap 211 covers the central burner cap seat. The first premixing chamber 20a1 provides the mixed gas required for the combustion of the inner flame. The outer burner cap 212 is arranged at an interval outside the central burner cap 211. The outer burner cap 212 surrounds the central burner cap 211 and, together with the burner head 22, constructs the second premixing chamber 20a2. Specifically, the outer burner cap 212 covers the outer ring gas chamber. The second premixing chamber 20a2 provides the mixed gas required for the combustion of the outer flame. The outer flame is ejected and burned through the outer ring fire holes on the outer burner cap 212.

[0106] The first ejector tube 31 is communicated with the first premixing chamber 20a1 and is used to transport the mixed gas of gas and air to the first premixing chamber 20a1, mainly responsible for the combustion of the inner flame, and the inner flame is usually used to provide high-temperature concentrated heating. The second ejector tube 32 is communicated with the second premixing chamber 20a2 and is used to transport the mixed gas of gas and air to the second premixing chamber 20a2, mainly responsible for the combustion of the outer flame, and the outer flame is usually used to provide a wider heating area.

[0107] It should be noted that the first premixing chamber 20a1 and the second premixing chamber 20a2 are isolated from each other. The smoke exhaust pipe 122 is connected to the first ejector tube 31 and / or the second ejector tube 32. That is, in one configuration, the smoke exhaust pipe 122 is only connected to the first ejector tube 31. The mixed gas in the first premixing chamber 20a1 is preheated by the high-temperature flue gas, the temperature rises, and the combustion reaction speed accelerates, making the combustion of the inner flame of the burner 20 more complete. The preheated mixed gas can achieve more efficient concentrated heating, which is suitable for the need of rapid temperature rise, such as rapid boiling or high-temperature stir-frying.

[0108] In another configuration, the smoke exhaust pipe 122 is only connected to the second ejector tube 32. The mixed gas in the second premixing chamber 20a2 is preheated by the high-temperature flue gas, the temperature rises, and the combustion reaction speed accelerates, making the combustion of the outer flame of the burner 20 more complete. The outer flame is mainly used to provide a wider heating area. The preheated mixed gas can achieve more efficient extensive heating, which is suitable for the need of large-area heating, such as stewing or baking.

[0109] In yet another configuration, the smoke delivery pipe 122 is connected to the first ejector pipe 31 and the second ejector pipe 32. The mixed gas in the first mixing chamber 20a1 and the second mixing chamber 20a2 is preheated by the high-temperature flue gas, so that the combustion processes of the inner flame and the outer flame in the burner 20 are optimized, the combustion is more stable, and it is suitable for various cooking requirements.

[0110] As Figure 6 shown, in some embodiments, the smoke delivery pipe 122 is configured to be connected to the first ejector pipe 31 and the second ejector pipe 32. Specifically, the smoke delivery pipe 122 includes a smoke delivery main pipe 1221 and two smoke delivery branch pipes 1222. The smoke delivery main pipe 1221 is connected and communicated with the smoke collecting member 121. The smoke delivery main pipe 1221 can centrally transport the high-temperature flue gas and air mixed gas collected from the smoke collecting member 121. The two smoke delivery branch pipes 1222 are both connected and communicated with the smoke delivery main pipe 1221. The two smoke delivery branch pipes 1222 are arranged at an angle and are respectively connected and communicated with the first ejector pipe 31 and the second ejector pipe 32. The smoke delivery main pipe 1221 and the two smoke delivery branch pipes 1222 are connected in a "Y" shape. The two smoke delivery branch pipes 1222 can distribute the flue gas and air mixed gas in the smoke delivery main pipe 1221 to the first ejector pipe 31 and the second ejector pipe 32. Specifically, the two smoke delivery branch pipes 1222 can be located above the first mixing section 34 and the second mixing section 34, and are respectively connected to the first mixing section 34 and the second mixing section 34.

[0111] It should be noted that the diameters of the two smoke delivery branch pipes 1222 can be the same or different. If the diameters of the two smoke delivery branch pipes 1222 are different, that is, the volumes of the mixed gas entering the first ejector pipe 31 and the second ejector pipe 32 are different, it can be set according to requirements. If the diameters of the two smoke delivery branch pipes 1222 are the same, the mixed gas can be evenly distributed to the first ejector pipe 31 and the second ejector pipe 32.

[0112] Among them, the smoke delivery main pipe 1221 and the two smoke delivery branch pipes 1222 are integrally formed, reducing the connection points between the smoke delivery main pipe 1221 and the two smoke delivery branch pipes 1222, thereby reducing the risk of gas leakage in the smoke delivery channel 122a caused by loosening or damage at the connection. The integrally formed structure is more robust, reducing deformation or damage caused by external forces. It also reduces the assembly difficulty, reduces complex assembly steps such as welding and threaded connection, thereby improving the assembly efficiency of the flue gas recovery device 12.

[0113] Please continue to refer to Figure 6Furthermore, in the configuration with the power device 124, the power device 124 can be arranged on the smoke delivery main pipe 1221, and can centrally drive the airflow of the entire smoke delivery pipe 122, so that the mixed gas of smoke and air is effectively sucked in and accelerated before entering the smoke delivery branch pipe 1222, and further control the airflow speed and flow rate entering the first ejector pipe 31 and the second ejector pipe 32. The power device 124 is arranged on the smoke delivery main pipe 1221, and the need for arranging additional power devices 124 on the smoke delivery branch pipe 1222 can also be reduced.

[0114] like Figure 4 and Figure 5 As shown, in some embodiments, the first ejector tube 31 and the second ejector tube 32 are arranged in parallel, and the smoke delivery tube 122 has an air delivery outlet 1223a connected to the smoke delivery channel 122a, which can be arranged toward the air inlet end of the first ejector tube 31 and the second ejector tube 32, so that the negative pressure at the air inlet end of the first ejector tube 31 and the second ejector tube 32 sucks the gas of the air delivery outlet 1223a. Specifically, the smoke delivery pipe 122 includes a smoke delivery main pipe 1221 and a diffusion pipe 1223. The smoke delivery main pipe 1221 is connected to the smoke collecting piece 121, and the diffusion pipe 1223 is connected to the end of the smoke delivery main pipe 1221 away from the smoke collecting piece 121. The diffusion pipe 1223 has the above-mentioned air delivery outlet 1223a. The diffusion pipe 1223 is in a trumpet shape that gradually expands in the direction of the first ejector pipe 31 and the second ejector pipe 32. The trumpet-shaped diffusion pipe 1223 can reduce internal turbulence and resistance, so that the high-temperature smoke can flow out more smoothly to fill the surrounding of the air inlet ends of the first ejector pipe 31 and the second ejector pipe 32. The trumpet-shaped design increases the contact area between the high-temperature flue gas and the air inlet ends of the first ejector tube 31 and the second ejector tube 32, so that the high-temperature flue gas can be more evenly distributed to the air inlet ends of the first ejector tube 31 and the second ejector tube 32, and is sucked into the first ejector tube 31 and the second ejector tube 32 by utilizing the Venturi effect, thereby ensuring the intake amount of the high-temperature flue gas.

[0115] The high-temperature flue gas sucked in from the air inlet ends of the first ejector tube 31 and the second ejector tube 32 can be accelerated when passing through the Venturi channel, thereby increasing the kinetic energy of the high-temperature flue gas. The high-temperature flue gas flows in at a higher speed and efficiency, so that it can enter the interior of the first ejector tube 31 and the second ejector tube 32 more quickly and be fully mixed with the fuel gas and air. Moreover, its movement path is longer, that is, the fuel gas and air are mixed for more time, thereby obtaining a more uniform mixed gas, further optimizing the combustion conditions, making the mixed gas more stable during combustion, and being able to more comprehensively optimize the combustion process.

[0116] It should be noted that the air supply outlet 1223a is spaced from the intake ends of the first ejector tube 31 and the second ejector tube 32. That is, the air supply outlet 1223a does not need to be directly connected to the first ejector tube 31 and the second ejector tube 32, but is located near the intake ends of the first ejector tube 31 and the second ejector tube 32, so that the high-temperature flue gas can be sucked into the ejector tube 30 by the negative pressure of the air supply outlet 1223a, rather than being directly injected into the interior of the ejector tube 30. And it enables the intake ends of the first ejector tube 31 and the second ejector tube 32 to still be in contact with the external air, and simultaneously suck in the external air through the negative pressure effect, making full use of the natural ejecting ability of the ejector tube 30, without the need for an additional power device 124 to push the high-temperature flue gas into the first ejector tube 31 and the second ejector tube 32.

[0117] As Figure 7 shown, in some embodiments, the gas stove 1 further includes a gas pipe 40, which is connected to the first ejector tube 31 and the second ejector tube 32. The gas pipe 40 communicates with an external gas source, and the gas pipe 40 is used to supply gas to the first ejector tube 31 and the second ejector tube 32. The gas pipe 40 can be made of a multi-layer structure, including a plastic hose, a metal-wound tube, and a flame-retardant and corrosion-resistant polyvinyl chloride (PVC) protective sleeve, which can provide a good flame-retardant and corrosion-resistant effect. To ensure that the gas pipe 40 can safely and stably transport gas during long-term use.

[0118] As Figure 4 and Figure 7 shown, the diffuser tube 1223 has gas holes 1223b, and the gas pipe 40 passes through the gas holes 1223b to be connected to the first ejector tube 31 and the second ejector tube 32, forming a connection relationship between the gas pipe 40 and the diffuser tube 1223, simplifying the overall structure of the system and reducing the connection components. Making the gas pipe 40 and the diffuser tube 1223 closely combined in space, avoiding mutual interference between the two. This spatial optimization design makes the gas stove 1 more compact, avoiding potential problems caused by interference between components, such as the problem of the gas pipe 40 being twisted.

[0119] Please refer to Figure 7 , in some embodiments, the smoke pipe 122 can also transport the high-temperature flue gas into the gas pipe 40. After the high-temperature flue gas enters the gas pipe 40 through the smoke passage 122a, it can preheat the gas, thereby increasing the temperature of the gas and reducing the heat input required during the combustion process. That is, when the gas enters the mixing chamber 20a to mix with air, it is easier to reach the temperature conditions required for combustion, enabling it to burn more fully and stably during combustion, and thus improving the combustion efficiency.

[0120] Please continue to refer to Figure 7, Further, the gas pipe 40 includes an inner gas pipe 41 and an outer gas pipe 42. The inner gas pipe 41 can be connected to the first ejector pipe 31, and the outer gas pipe 42 can be connected to the second ejector pipe 32. In one setting, a valve can be respectively provided in the inner gas pipe 41 and the outer gas pipe 42. The valve can be used to control the gas flow rate flowing into the first mixing chamber 20a1 or the second mixing chamber 20a2, that is, by adjusting the opening degree of the valve, the size of the inner flame or the outer flame can be independently adjusted, providing more flexible cooking options.

[0121] Wherein, the smoke delivery pipe 122 is connected and communicated with at least one of the inner gas pipe 41 and the outer gas pipe 42. Understandably, the smoke delivery pipe 122 can be only connected and communicated with the inner gas pipe 41, and directly convey the recovered high-temperature flue gas and air mixture to the inner gas pipe 41, which is specifically used to preheat the gas required for the inner flame, and can improve the combustion efficiency of the inner flame, making it more suitable for rapid heating or high-temperature cooking. Or, the smoke delivery pipe 122 can be only connected and communicated with the outer gas pipe 42, and directly convey the recovered high-temperature flue gas and air mixture to the outer gas pipe 42, which is specifically used to preheat the gas required for the outer flame, thereby improving the combustion efficiency of the outer flame and making it more suitable for slow cooking or uniform heating. Or, the recovered high-temperature flue gas and air mixture are simultaneously conveyed to the inner gas pipe 41 and the outer gas pipe 42, so that both the inner flame and the outer flame can benefit from the preheating. This design can comprehensively improve the combustion efficiency and optimize the entire combustion process. It can be set according to actual needs.

[0122] As Figure 8 shown, in some embodiments, the flue gas recovery device 12 further includes an air supplementing member 123. The air supplementing member 123 is located below the pot rack 10 and is connected to the smoke delivery pipe 122. The air supplementing member 123 has a first air supplementing port 123a facing the combustion chamber 11a, and the first air supplementing port 123a is communicated with the smoke delivery channel 122a, so that the flue gas flowing out from the first air supplementing port 123a preheats the secondary air flowing towards the combustion chamber 11a, can significantly increase the temperature of the secondary air, reduce the temperature difference during the combustion process, and the preheated air can more effectively participate in the combustion process, making the combustion more uniform and stable, reducing the phenomenon of incomplete combustion, and improving the combustion efficiency.

[0123] In the embodiments configured with the power device 124, the power device 124 can not only drive the flue gas and air mixture into the ejector pipe 30, but also convey the suctioned high-temperature flue gas and the entrained air to the position of the outer ring fire holes of the burner 20, supplementing the preheated secondary air for the burner 20, reducing the heat dissipation loss of the high-temperature flue gas, and improving the thermal efficiency.

[0124] As Figure 8 and Figure 9 shown, specifically, the air supplementing member 123 satisfies at least one of the following conditions:

[0125] The air supplementing member 123 is annular and can surround the burner 20. A plurality of first air supplementing ports 123a are provided, and the plurality of first air supplementing ports 123a are arranged at intervals on the side of the air supplementing member 123 facing the combustion chamber 11a, and can evenly supplement the preheated secondary air into the outer flame holes of the burner 20 from the circumference of the combustion chamber 11a, ensuring a more stable and efficient combustion process and reducing the phenomenon of uneven local temperature in the combustion chamber 11a. This makes the combustion of the burner 20 more complete and reduces the situation of incomplete combustion;

[0126] The air supplementing member 123 is a stainless steel air supplementing member or a ceramic air supplementing member to ensure its long-term stable operation in an environment of contacting high-temperature flue gas;

[0127] The diameter of the air supplementing member 123 is larger than the inner diameter of the pot support 10. The inner diameter of the pot support 10 refers to the diameter of the combustion chamber 11a formed by the pot support body 11, ensuring that the air supplementing member 123 covers a wider area, enabling the preheated air to be more evenly distributed into the combustion chamber 11a and not interfering with the burner 20 to hinder the rising of the flame of the burner 20;

[0128] The air supplementing member 123 is connected to the lower surface 113a of the pot support 10, that is, connected to the lower surface 113a of the lower layer cover 113, closer to the position of the outer flame holes of the burner 20, ensuring that the preheated air directly enters the combustion area. Specifically, the air supplementing member 123 can be fixed to the lower surface 113a of the pot support 10 by means of welding, screwing, buckling, etc., to ensure the stability of its position.

[0129] As Figure 10 shown, in some embodiments, the air supplementing member 123 includes a ring body 1231 and a plurality of air supplementing swirl members 1232. The ring body 1231 has an inner cavity 123b communicating with the smoke delivery channel 122a and the above-mentioned first air supplementing ports 123a. The plurality of air supplementing swirl members 1232 are arranged at intervals in the inner cavity 123b, and an air supplementing swirl channel 123c is formed between two adjacent air supplementing swirl members 1232. The air supplementing swirl channel 123c is used to change the flow direction of the secondary air in the inner cavity 123b so that the secondary air blown out from the first air supplementing ports 123a is arranged around the axis of the combustion chamber 11a.

[0130] Specifically, the air supplementing swirl member 1232 can include an arc-shaped swirl plate, and the arc-shaped swirl plate is arranged in the inner cavity 123b and extends in an arc shape, so that the air supplementing swirl channel 123c is arc-shaped, extending the movement path of the secondary air, thereby increasing the preset temperature of the secondary air and further improving the overall thermal efficiency of the gas stove 1.

[0131] It can be understood that the air supplement swirl member 1232 may also include a planar swirl plate (not shown in the figure). The planar swirl plate is disposed in the inner cavity 123b, and the planar swirl plate is disposed at an angle with the radial direction of the combustion chamber 11a passing through itself. Similarly, the flow direction of the secondary air can be changed so that the secondary air blown out from the air outlet is disposed around the axis of the combustion chamber 11a, thereby extending the movement path of the secondary air, and further improving the preset temperature of the secondary air, and further improving the overall thermal efficiency of the gas stove 1. Understandably, the planar swirl plate is easier to process and manufacture, and the swirl effect of the arc-shaped swirl plate is better. In the embodiments of the present application, the specific form of the air supplement swirl member 1232 is not limited.

[0132] As Figure 11 shown, in some embodiments, the smoke delivery pipe 122 may also be directly connected to the gas mixing chamber 20a to deliver the high-temperature smoke inhaled from the smoke suction port 121a into the gas mixing chamber 20a, so as to mix the mixed gas in the gas mixing chamber 20a, thereby heating the mixed gas in the gas mixing chamber 20a to preheat the temperature of the mixed gas to a preset temperature, accelerating the volatilization and mixing of the fuel, and further shortening the combustion time of the fuel when the mixed gas enters the combustion chamber for combustion, promoting a more complete oxidation reaction, and thus improving the overall thermal efficiency of the gas stove 1.

[0133] In the description of the present application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or position relationship based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for exemplary illustration and cannot be understood as a limitation of the present patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0134] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as implying or indicating relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0135] In the description of the present application, unless otherwise clearly specified or limited, terms such as "installed", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0136] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0137] The above content is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present application can easily think of changes or substitutions, which should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A gas stove, characterized in that, Comprising: A burner having a gas mixing chamber; A pot support, arranged in a ring and enclosing a combustion chamber for the flame of the burner to pass through, and the pot support further has an upper surface facing the cooking utensil; An ejector tube communicating with the gas mixing chamber; and A flue gas recovery device having a smoke suction port and a smoke delivery channel connected to each other. The part of the flue gas recovery device having the smoke suction port is located on the upper surface or on the outer periphery of the pot support and at least partially protrudes upward from the upper surface for collecting flue gas, and the smoke delivery channel is connected to the ejector tube for delivering the flue gas sucked by the smoke suction port into the ejector tube.

2. The gas stove according to claim 1, wherein The flue gas recovery device includes: A smoke collecting member having the smoke suction port, located on the upper surface or on the outer periphery of the pot support and at least partially protruding upward from the upper surface; and A smoke delivery pipe connected to the smoke collecting member and the ejector tube and having the smoke delivery channel, and the smoke delivery pipe is located outside the pot support.

3. The gas stove according to claim 2, wherein The ejector tube includes: An ejector section having a Venturi channel for accelerating the ejection of gas to generate a low-pressure area and attracting the entry of surrounding primary air; and A mixing section connected to the downstream of the ejector section along the gas flow direction for mixing gas and primary air; Wherein, the smoke delivery pipe is connected to at least one of the mixing section and the ejector section.

4. The gas stove according to claim 3, characterized in that, The ejector tube includes a first ejector tube and a second ejector tube, and the gas outlet ends of the first ejector tube and the second ejector tube are both connected to the gas mixing chamber, and the smoke delivery pipe is connected to the first ejector tube and / or the second ejector tube.

5. The gas stove according to claim 3, wherein The ejector tube includes a first ejector tube and a second ejector tube, and the gas mixing chamber includes a first gas mixing chamber and a second gas mixing chamber; the burner includes: A burner head; A central fire cover covering the burner head and defining the first gas mixing chamber with the burner head; and An outer fire cover arranged at an interval outside the central fire cover and defining the second gas mixing chamber with the burner head; Wherein, the first ejector tube is connected to the first gas mixing chamber, the second ejector tube is connected to the second gas mixing chamber, and the smoke delivery pipe is connected to the first ejector tube and / or the second ejector tube.

6. The gas stove according to claim 4 or 5, characterized in that The smoke delivery pipe includes: A smoke delivery main pipe connected and communicating with the smoke collecting member; and Two smoke delivery branch pipes, both connected and communicating with the smoke delivery main pipe, and the two smoke delivery branch pipes are arranged at an angle and respectively connected to the first ejector tube and the second ejector tube.

7. The gas stove according to claim 4 or 5, characterized in that, The first ejector tube and the second ejector tube are arranged in parallel; the smoke delivery pipe includes: A smoke delivery main pipe connected to the smoke collecting member; and A diffuser tube connected to the end of the smoke delivery main pipe away from the smoke collecting member, and the diffuser tube has a gas delivery outlet communicating with the smoke delivery channel, and the gas delivery outlet is arranged facing the gas inlet ends of the first ejector tube and the second ejector tube; Wherein, the diffuser tube is in a trumpet shape that gradually expands in the direction of the first ejector tube and the second ejector tube.

8. The gas stove according to claim 7, characterized in that, The diffuser tube has a gas hole, and the gas stove further includes: A gas pipe passing through the gas hole for supplying gas to the first ejector tube and the second ejector tube.

9. The gas stove according to claim 2, characterized in that, The pot support includes: Upper cover, having the upper surface; and Lower cover, connected to the upper cover and located below the upper cover, with a heat insulation cavity formed between the lower cover and the upper cover; Wherein, the smoke collecting member is annular, disposed around the circumferential side wall of the upper cover and at least partially protruding upward from the upper surface, and a plurality of smoke suction ports are provided, and the plurality of smoke suction ports are arranged at intervals along the circumferential direction of the smoke collecting member.

10. The gas stove according to claim 9, characterized in that, The inner diameter of the smoke collecting member is D1, the outer diameter of the upper cover is D2, and D1 and D2 satisfy: 0 ≤ D1 - D2 ≤ 20 mm.

11. The gas stove according to claim 9, characterized in that, The plurality of smoke suction ports are located on the side of the smoke collecting member facing the combustion chamber; and / or The smoke suction port is located above the upper surface.

12. The gas stove according to any one of claims 9-11, characterized in that, The flue gas recovery device further includes: Power device, disposed in the smoke delivery pipe, and the power device is used to drive flue gas and air to enter the smoke delivery channel from the smoke suction port and be input into the ejector pipe.

13. The gas stove according to any one of claims 9-11, characterized in that, The flue gas recovery device further includes: Air supplementing member, located on the lower side of the lower cover and connected to the smoke delivery pipe, the air supplementing member has a first air supplementing port facing the combustion chamber, and the first air supplementing port is communicated with the smoke delivery channel, so that the flue gas flowing out from the first air supplementing port preheats the secondary air flowing towards the combustion chamber.

14. The gas stove according to claim 13, characterized in that, The air supplementing member satisfies at least one of the following conditions: The air supplementing member is annular, and a plurality of the first air supplementing ports are provided, and the plurality of first air supplementing ports are arranged at intervals on the side of the air supplementing member facing the combustion chamber; The diameter of the air supplementing member is greater than the inner diameter of the lower cover; The air supplementing member is connected to the lower surface of the lower cover.

15. The gas stove according to any one of claims 2-4, 8-11, and 14, characterized in that, The flue gas recovery device further includes: Filter member, detachably connected to the smoke delivery pipe, partially located in the smoke delivery channel, and the filter member is used to filter the flue gas flowing towards the ejector pipe.

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