Combustor

Abstract

The application relates to the technical field of gas stoves, and provides a burner. The burner at least comprises a shell and an inner core arranged in the shell, the inner core is internally provided with an injection channel, the injection channel comprises a main channel and a plurality of backflow channels arranged at the side edges of the main channel, the backflow channels are arranged to block the flow, the situation of backfire can be effectively prevented, and the service life of the device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas stoves, in particular to a burner. BACKGROUND

[0002] In the related art, when a gas water heater is in use or shutdown, the flame is prone to burning back into the burner, which affects the service life of the gas water heater. SUMMARY

[0003] Therefore, it is necessary to provide a burner to prevent backfire and improve the service life of the device.

[0004] The burner provided by the embodiments of the present application comprises:

[0005] a housing, which is provided with an air outlet at the top thereof, an air inlet at the bottom thereof, and a containing cavity communicating with the air outlet and the air inlet; and

[0006] an inner core, which is arranged in the containing cavity and is provided with an injection channel, wherein an injection inlet of the injection channel communicates with the air inlet to introduce gas and air, and an injection outlet of the injection channel communicates with the air outlet;

[0007] The injection channel comprises a main channel extending along a first direction and communicating with the injection inlet and the injection outlet, and a plurality of backflow channels arranged at the side of the main channel and communicating with the main channel.

[0008] Each backflow channel comprises a first backflow section and a second backflow section, wherein a first end of the first backflow section communicates with the main channel, a second end of the first backflow section extends linearly away from the main channel and towards the injection inlet, and a first end of the second backflow section communicates with the second end of the first backflow section, a second end of the second backflow section extends arcuately towards the main channel and away from the injection inlet, and the second end of the second backflow section communicates with the main channel.

[0009] In a second direction, the first end of the first backflow section is located upstream of the second end of the first backflow section, and the second end of the first backflow section is located upstream of the second end of the second backflow section.

[0010] The second direction is opposite to the first direction.

[0011] In the above burner, the burner at least comprises a housing and an inner core arranged in the housing, the inner core is provided with an injection channel, the injection channel comprises a main channel and a plurality of backflow channels arranged at the side of the main channel, and the backflow is effectively prevented by blocking the flow through the plurality of backflow channels, thereby improving the service life of the device.

[0012] In one of the embodiments, the plurality of backflow channels are arranged on both sides of the main channel. Since the backflow channels are arranged on both sides of the main channel, the two sides of the main channel provide channels for preventing backfire. In this way, the backfire situation can be further effectively prevented.

[0013] In one of the embodiments, the plurality of backflow channels are arranged alternately on both sides of the main channel along the length direction of the injection channel. Since the backflow channels are arranged alternately, the movement path of the backfire is more tortuous. In this way, the backfire situation can be further prevented.

[0014] In one of the embodiments, the main channel has a first side and a second side arranged oppositely, and the plurality of backflow channels are arranged on the first side and the second side;

[0015] One of the backflow channels arranged on the first side is located between two adjacent backflow channels arranged on the second side. In this way, the space is effectively utilized, and the backfire situation can be further prevented.

[0016] In one of the embodiments, the angle between the direction in which the input end of the first backflow section extends linearly and the first direction is α1;

[0017] In this way, the backflow channel can better reduce and block the flame, effectively preventing the flame from burning back into the burner.

[0018] In one of the embodiments, the diameter of the main channel is d;

[0019] In this way, the gas supply amount is ensured, the combustion process is more sufficient, and the backfire can be prevented.

[0020] In one of the embodiments, the inner core further comprises a plurality of air introduction channels for introducing air;

[0021] The air introduction inlet of the air introduction channel is connected to the air inlet, and the air introduction outlet of the air introduction channel is connected to the main channel. In this way, the air can be effectively mixed with the gas in the main channel, which is beneficial to the combustion process.

[0022] In one of the embodiments, the plurality of air introduction channels are arranged on both sides of the main channel. In this way, the air can be more fully mixed with the gas.

[0023] In one of the embodiments, the plurality of air introduction channels are symmetrically arranged on both sides of the main channel. In this way, the air and the gas can be more fully mixed.

[0024] In one of the embodiments, the air flow inlets of the plurality of air flow channels are located in the same plane as the injection inlets, and the extension directions of the plurality of air flow channels located on the same side of the main channel are parallel to each other. In this way, the air can be orderly introduced and mixed with the fuel gas.

[0025] In one of the embodiments, the angle between the extension direction of each air flow channel and the first direction is a2;

[0026] wherein 30°≤a2≤60°. In this way, the air can be introduced into the main channel while ensuring the air intake.

[0027] In one of the embodiments, along the first direction, the air flow outlet of each air flow channel is located upstream of the first backflow channel. In this way, since the air flow outlet avoids the backflow channel, not only can the air interfere with the backflow channel be prevented, but also the air can be mixed with the fuel gas and introduced into the main channel.

[0028] In one of the embodiments, the injection channel further comprises a guide channel connecting the injection outlet and the output end of the main channel;

[0029] Along the first direction, the cross-sectional width of the guide channel gradually increases. In this way, the space provided in the manner of diffuser not only facilitates the mixed gas of air and fuel gas to be stably delivered into the accommodation cavity, but also increases the difficulty of the flame entering the main channel, further preventing backfire from entering the burner.

[0030] In one of the embodiments, the inner core comprises a first cover and a second cover covering the first cover;

[0031] The injection channel is formed on the covering surface of one of the first cover and the second cover;

[0032] Alternatively, the covering surface of the first cover is provided with a first channel, and the covering surface of the second cover is provided with a second channel, and the first channel and the second channel jointly constitute the injection channel. In this way, the inner core with the injection channel can be easily manufactured.

[0033] In one of the embodiments, the inner core further comprises a sealing member arranged between the first cover and the second cover;

[0034] When the injection channel is formed on the covering surface of one of the first cover and the second cover, the sealing member covers the injection channel;

[0035] When the injection channel is jointly constituted by the first channel and the second channel, the sealing member is arranged on both sides of the injection channel. In this way, the sealing property between the first cover and the second cover after covering can be improved.

[0036] In one embodiment, the cross-sectional width of the accommodating cavity between the injection outlet and the flame outlet gradually increases along the first direction. In this way, the difficulty of the flame entering the main channel can be increased in a manner of diffuser, further preventing backfire from entering the burner. Meanwhile, the space provided facilitates better mixing of air and gas together, making the mixing process stable and conducive to the subsequent combustion process.

[0037] In one embodiment, the burner further comprises a flame distribution sheet arranged at the flame outlet, the flame distribution sheet being configured to distribute the mixed gas flow of air and gas. In this way, the flame distribution sheet can further prevent backfire from entering the burner.

[0038] Additional aspects and advantages of the embodiments disclosed herein will be set forth in part in the description that follows, and in part will become apparent to those having ordinary skill in the art upon examination of the following or can be learned from practice of the embodiments described herein. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 A cross-sectional structure diagram of a burner in one embodiment of the related art;

[0040] Figure 2 A structure diagram of a burner in one embodiment of the present application;

[0041] Figure 3 An exploded structure diagram of a burner in one embodiment of the present application;

[0042] Figure 4 A structure diagram of an inner core in one embodiment of the present application;

[0043] Figure 5 An exploded structure diagram of an inner core in one embodiment of the present application;

[0044] Figure 6 A structure diagram of the second cover and the second shell cooperating together in one embodiment of the present application;

[0045] Figure 7 A partial structure diagram of a backflow channel in a first state in one embodiment of the present application;

[0046] Figure 8 A partial structure diagram of a backflow channel in a second state in one embodiment of the present application;

[0047] Figure 9 A first state diagram of the second cover and the second shell cooperating together in one embodiment of the present application;

[0048] Figure 10 Figure 2 is a schematic view of a second state of a second cover cooperating with a second shell according to an embodiment of the present application;

[0049] Figure 11 Figure 3 is a schematic view of a structure of an inner core according to another embodiment of the present application;

[0050] Figure 12 Figure 4 is a schematic view of an exploded structure of an inner core according to another embodiment of the present application;

[0051] Figure 13 Figure 5 is a schematic view of a structure of a second cover cooperating with a second shell according to another embodiment of the present application;

[0052] Figure 14 Figure 6 is a schematic view of a first state of a second cover cooperating with a second shell according to another embodiment of the present application;

[0053] Figure 15 Figure 7 is a schematic view of a second state of a second cover cooperating with a second shell according to another embodiment of the present application;

[0054] Figure 16 Figure 8 is a schematic view of a structure of a burner assembly according to an embodiment of the present application;

[0055] Figure 17 Figure 9 is a schematic view of a structure of a gas water heater according to an embodiment of the present application.

[0056] Element symbol simple explanation:

[0057] Burner assembly 1;

[0058] Burner 10;

[0059] Housing 100, fire outlet 101, air inlet 102, containing cavity 103, first shell 110, second shell 120;

[0060] Inner core 200, first cover 201, second cover 202, sealing member 203, injection channel 210, injection inlet 2101, injection outlet 2102, main channel 211, backflow channel 212, first backflow section 2121, first end a1 of first backflow section 2121, second end b1 of first backflow section 2121, second backflow section 2122, first end a2 of second backflow section 2122, second end b2 of second backflow section 2122, flow guide channel 213, flow guide channel 220;

[0061] Splitter 300;

[0062] Jet pipe 20;

[0063] gas passage p;

[0064] first direction z1, second direction z2;

[0065] crossing width W. DETAILED DESCRIPTION

[0066] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art, that the embodiments of the present application can be practiced without some or all of these specific details, and that the embodiments of the present application are not limited to the specific embodiments described below. In other instances, well-known methods, procedures, components, and networks have not been described in detail so as not to unnecessarily obscure aspects of the embodiments of the present application.

[0067] It can be understood that the terms "first", "second", and the like used in the present application can be used herein to describe various professional terms, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. However, unless otherwise specified, these professional terms are not limited by these terms. These terms are only used to distinguish one professional term from another. For example, without departing from the scope of the present application, the first direction, the second direction, and the third direction are different directions, and the first surface and the second surface are different surfaces. In the description of the embodiments of the present application, the meaning of "a plurality of" or "several" is at least two, such as two, three, and the like, unless otherwise explicitly specified.

[0068] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrated; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0069] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature is "over", "above" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. The first feature is "under", "below" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than the horizontal height of the second feature.

[0070] It should be noted that when an element is referred to as being "fixed to" or "set to" another element, it can be directly on the other element or there can 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 can be an intermediate element.

[0071] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the present application are only for the purpose of describing specific embodiments of the present application and are not intended to limit the present application.

[0072] Figure 1 A cross-sectional structure schematic diagram of the burner 10 in an embodiment of the related art is shown; only the part related to the embodiment of the related art is shown for the convenience of description.

[0073] In the related art, the gas water heater is prone to have the flame burn back into the burner 10 when in use or shutdown. As shown in Figure 1 As shown, in the backfire state, the flame enters from the flame hole of the flame plate 300 and enters the inside of the burner 10 along the gas passage p. When the backfire is serious, the flame will burn to the nozzle of the gas inlet 102 of the burner 10, and then affect the service life of the gas water heater.

[0074] The present inventors have noticed that the backfire situation is more likely to occur when the gas water heater is shutdown or the gas combustion potential is relatively high (i.e. the combustion speed is relatively large). For example, when using artificial gas with a relatively high hydrogen content. Generally, the backfire phenomenon can be alleviated by reducing the flame hole of the burner 10 (for example, increasing the flame plate 300 of the burner 10). However, if the flame hole is too small, the gas combustion potential will also be affected, which cannot meet the use requirements of the user, and then affect the user experience.

[0075] In order to prevent backfire, improve the service life of the device, and not affect the user experience, the present application inventors have found that the fluid characteristics of the gas and air mixture can be improved for the backfire flow channel. Specifically, an inner core 200 with a flow channel structure is added inside the burner 10, which blocks the flame from burning into the interior of the burner 10 through the flow channel structure of the inner core 200, thereby preventing backfire. At the same time, the aforementioned problems caused by reducing the flame hole of the burner 10 to reduce backfire are avoided.

[0076] The burner 10 provided by the embodiments of the present application is described in relation to the description of some embodiments.

[0077] Figure 2 A structural schematic diagram of the burner 10 in an embodiment of the present application is shown; Figure 3 An exploded structural schematic diagram of the burner 10 in an embodiment of the present application is shown; Figure 4 A structural schematic diagram of the inner core 200 in an embodiment of the present application is shown; Figure 5 An exploded structural schematic diagram of the inner core 200 in an embodiment of the present application is shown. For ease of description, only the parts related to the embodiments of the present application are shown.

[0078] Please refer to Figure 2 and Figure 3 The present application provides a burner 10, which comprises an outer shell 100 and an inner core 200. The outer shell 100 is provided with a flame outlet 101 at the top, an air inlet 102 at the bottom, and a receiving cavity 103 communicating with the flame outlet 101 and the air inlet 102, and the inner core 200 is arranged in the receiving cavity 103. In some embodiments, as shown in Figure 3 The outer shell 100 is composed of a first shell 110 and a second shell 120, and the receiving cavity 103 is defined by the first shell 110 and the second shell 120 after being closed. The first shell 110 and the second shell 120 can be connected by a detachable method such as buckling or clamping, or can be connected by a non-detachable method such as welding, which can be selected according to the needs, and the embodiments of the present application do not make specific limitations. Please refer to Figure 4 and Figure 5 The inner core 200 is provided with an injection channel 210, the injection inlet 2101 of the injection channel 210 is communicated with the air inlet 102 for introducing gas and air, and the injection outlet 2102 of the injection channel 210 is communicated with the flame outlet 101. In some embodiments, as shown in Figure 5As shown, the inner core 200 is covered by the first cover 201 and the second cover 202, and the injection channel 210 is arranged on the covering surface of one of the first cover 201 and the second cover 202. That is, the injection channel 210 is arranged on the covering surface of the first cover 201, or the injection channel 210 is arranged on the covering surface of the second cover 202. Alternatively, the covering surface of the first cover 201 is provided with a first channel, and the covering surface of the second cover 202 is provided with a second channel, and the first channel and the second channel jointly form the injection channel 210. The selection can be made according to actual needs, and the embodiments of the present application do not make specific limitations in this regard.

[0079] It can be understood that the "covering surface" of the first cover 201 refers to the surface of the first cover 201 covering the second cover 202, and the "covering surface" of the second cover 202 refers to the surface of the second cover 202 covering the first cover 201.

[0080] In order to further improve the sealing performance, a sealing member 203 can be arranged between the first cover 201 and the second cover 202. When the injection channel 210 is arranged on the covering surface of one of the first cover 201 and the second cover 202, the sealing member 203 covers the injection channel 210. At this time, the sealing member 203 can be provided in a sheet structure. For example, as shown in Figure 5 Figure 5 The part of the second cover 202 provided with the injection channel 210 is shown, and the sealing member 203 is in a sheet structure. When the injection channel 210 is jointly formed by the first channel and the second channel, the sealing member 203 is arranged on both sides of the injection channel 210. At this time, the sealing member can be provided in a strip structure. In this way, the structure of the inner core 200 required can be easily manufactured. Of course, other structure forms of the sealing member 203 can also be used to achieve the purpose of improving the sealing performance, and the corresponding manufacturing method and structure of the injection channel 210 can be selected according to the use requirements, and the embodiments of the present application do not make specific limitations in this regard.

[0081] The following further describes the case that the outer shell 100 is covered by the first shell 110 and the second shell 120, the inner core 200 is covered by the first cover 201 and the second cover 202, and the injection channel 210 is arranged on the surface of the second cover 202 covering the first cover 201.

[0082] Figure 6 A structure schematic diagram of the second cover 202 and the second shell 120 cooperating together in an embodiment of the present application is shown; Figure 7 A partial structure schematic diagram of the backflow channel 212 in a first state in an embodiment of the present application is shown; Figure 8 ​Fig. 2 shows a schematic view of a partial structure of the backflow passage 212 in the second state according to an embodiment of the present application. For the convenience of description, only the parts related to the embodiment of the present application are shown. The first state refers to the tempering state, and the second state refers to the normal combustion state, which will not be described hereinafter.

[0083] In some embodiments, referring to Figure 6 , the second cover 202 is arranged in the second shell 120, the injection passage 210 includes a main passage 211 extending along a first direction z1 and communicating with the injection inlet 2101 and the injection outlet 2102, and a plurality of backflow passages 212 arranged on the side of the main passage 211 and communicating with the main passage 211. The first direction z1 is the direction from the air inlet 102 to the fire outlet 101. Each backflow passage 212 includes a first backflow section 2121 and a second backflow section 2122. The first end a1 of the first backflow section 2121 communicates with the main passage 211, the second end b1 of the first backflow section 2121 extends linearly away from the main passage 211 and towards the injection inlet 2101, and the first end a2 of the second backflow section 2122 communicates with the second end b1 of the first backflow section 2121. The second end b2 of the second backflow section 2122 extends arcuately towards the main passage 211 and away from the injection inlet 2101, and the second end b2 of the second backflow section 2122 communicates with the main passage 211. As shown in Figure 7 and Figure 8 , along a second direction z2 (i.e. the direction from the fire outlet 101 to the air inlet 102), the first end a1 of the first backflow section 2121 is located upstream of the second end b1 of the first backflow section 2121, and the second end b1 of the first backflow section 2121 is located upstream of the second end b2 of the second backflow section 2122. It can be understood that the first direction z1 is opposite to the second direction z2.

[0084] It should be noted that the "plurality of backflow passages 212 arranged on the side of the main passage 211 and communicating with the main passage 211" means that at least one side of the main passage 211 is provided with the backflow passage 212. When the backflow passages 212 are arranged on both sides of the main passage 211, the number of backflow passages 212 on each side can be the same or different. For example, Figure 6For example, it is shown that the main channel 211 is provided with backflow channels 212 on both sides, and the number of backflow channels 212 on both sides is different. It can be set according to the actual use, and the embodiment of the present application does not make specific limitation. "Along the second direction z2, the first end a1 of the first backflow section 2121 is located upstream of the second end b1 of the first backflow section 2121, and the second end b1 of the first backflow section 2121 is located upstream of the second end b2 of the second backflow section 2122" is relative to the first direction z1 (i.e. the direction from the air inlet 102 to the air outlet 101). Along the direction from the air outlet 101 to the air inlet 102, the second end b2 of the second backflow section 2122 is located upstream of the second end b1 of the first backflow section 2121, and the second end b1 of the first backflow section 2121 is located upstream of the first end a1 of the first backflow section 2121.

[0085] Figure 9 A first state diagram showing that the second cover 202 cooperates with the second shell 120 in an embodiment of the present application is shown; Figure 10 A second state diagram showing that the second cover 202 cooperates with the second shell 120 in an embodiment of the present application is shown; only parts related to the embodiment of the present application are shown for convenience of description.

[0086] Please continue to refer to Figure 7 and Figure 9 , and refer to Figure 6 , in the tempering state, the flame enters the flow guide channel 220 along the direction from the air outlet 101 to the air inlet 102, and the flame enters along the main channel 211 and the backflow channel 212 located on the side of the main channel 211. The backflow channel 212 divides the flame entering along the main channel 211 into two parts. The first part of the flame enters from the main channel 211; the second part of the flame enters from the first end a1 of the first backflow section 2121 and enters the first end a2 of the second backflow section 2122 along the first backflow section 2121. When the second part of the flame enters the second backflow section 2122 from the second end b2 of the second backflow section 2122, it meets the first part of the flame. Since the second backflow section 2122 is arc-shaped, and the second end b2 of the second backflow section 2122 is located downstream of the first end a2 of the second backflow section 2122 (i.e. the second end b1 of the first backflow section 2121), under the action of the arc-shaped structure, the second part of the flame has a velocity component along the first direction z1 when it comes out of the second end b2 of the second backflow section 2122, and the second part of the flame hinders the first part of the flame from flowing along the direction from the air outlet 101 to the air inlet 102. In this way, the flame burning trend is weakened every time it passes through a backflow channel 212. Please continue to refer to Figure 8 and Figure 10 , and refer to Figure 6, when in normal combustion state, the gas enters the main passage 211 along the first direction z1, and due to the arc shape of the second reflux section 2122 and the second end b2 of the second reflux section 2122 being located upstream of the first end a2 of the second reflux section 2122 (i.e. the second end b1 of the first reflux section 2121), the reflux passage 212 does not hinder the gas, and the combustion process can proceed smoothly. Optionally, as shown in Figure 6 , three reflux passages 212 can be arranged on one side of the main passage 211, and two reflux passages 212 can be arranged on the other side of the main passage 211. Of course, the number of reflux passages 212 can be increased or decreased according to the actual combustion condition, which is not limited in the embodiments of the present application.

[0087] Thus, by arranging multiple reflux passages 212 to block the flow, a passage similar to the shape of a Tesla valve is formed, which can effectively prevent backfire and improve the service life of the device.

[0088] To further effectively prevent backfire, in some embodiments, please continue to refer to Figure 6 , the multiple reflux passages 212 are arranged on both sides of the main passage 211. Since the reflux passages 212 are arranged on both sides of the main passage 211, the two sides of the main passage 211 provide channels to prevent backfire. In some embodiments, along the length direction of the injection passage 210, the multiple reflux passages 212 are alternately arranged on both sides of the main passage 211. Since the reflux passages 212 are alternately arranged, the movement path of the backfire is more tortuous. Thus, the backfire is further prevented. Optionally, the two sides of the main passage 211 are oppositely arranged first side and second side, and the multiple reflux passages 212 are arranged on the first side and the second side. One reflux passage 212 arranged on the first side is located between two adjacent reflux passages 212 on the second side. Thus, the space is effectively utilized, and the backfire is further prevented. Of course, along the first direction z1, two reflux passages 212 can be arranged on one side of the main passage 211, one reflux passage 212 can be arranged on the other side of the main passage 211, and two reflux passages 212 can be arranged on one side of the main passage 211. The selection can be made according to the actual use, which is not limited in the embodiments of the present application.

[0089] Further research by the inventor of the present application shows that if the bending angle of the second reflux section 2122 is too small, the second flame cannot well block the first flame entering from the main passage 211 when the second flame comes out of the second reflux section 2122, and the flame reduction effect is not obvious. If the bending angle of the second reflux section 2122 is too large, the flame is difficult to enter the second reflux section 2122, and it is more difficult to block the first flame entering from the main passage 211, and the flame reduction effect is also not obvious. Thus, in some embodiments, as shown inFigure 6 As shown, the angle between the direction in which the input end of the first backflow section 2121 extends linearly and the first direction z1 is a1, and 30°≤a1≤60°. In this way, the backflow channel 212 can better reduce and block the flame, effectively preventing the flame from burning back into the burner 10.

[0090] Meanwhile, the present inventors have further noticed that if the diameter of the main channel 211 is too large, the hydrogen content in the introduced gas will also be too large, and the gas combustion potential will be higher (i.e., the combustion speed will be larger), which is more likely to cause backfire. If the diameter of the main channel 211 is too small, the gas intake will be reduced, causing the combustion process to be insufficient. Thus, in some embodiments, as shown in Figure 6 As shown, the diameter of the main channel 211 is d, and 2mm≤d≤5mm. In this way, the gas supply amount is ensured, the combustion process is more sufficient, and backfire is prevented.

[0091] Figure 11 Another embodiment of the inner core 200 is shown in the structural schematic diagram of the inner core 200 in another embodiment of the present application; Figure 12 Another embodiment of the inner core 200 is shown in the structural schematic diagram of the inner core 200 in another embodiment of the present application; Figure 13 Another embodiment of the inner core 200 is shown in the structural schematic diagram of the inner core 200 in another embodiment of the present application;

[0092] To prevent the gas combustion potential from being too large to cause backfire, when air is introduced, the air flow channel 220 can be designed according to the power characteristics generated when the gas enters the injection channel 210. In some embodiments, as shown in Figure 4 and Figure 5 As shown, the air flow channel 220 can be a channel with a cross-sectional area that gradually decreases along the first direction z1. The air flow inlet of the air flow channel 220 is connected to the air inlet 102, and the air flow outlet of the air flow channel 220 is connected to the main channel 211. Further, please refer to Figure 6 , Figure 9 and Figure 10 It can be seen that the air flow channel 220 is an integral structure. In other embodiments, to effectively mix the introduced air with the gas and prevent the gas combustion potential from being too large, please refer to Figure 11 to Figure 13The inner core 200 is further provided with a plurality of air introduction channels 220 for introducing air. The air introduction inlets of the air introduction channels 220 are communicated with the air inlet 102, and the air introduction outlets of the air introduction channels 220 are communicated with the main channel 211. In this way, the air can be divided by dividing the air introduction channels 220 into a plurality of air introduction channels. When the air enters the main channel 211 through the air introduction channels 220 with a smaller diameter, the air can be accelerated, so that the air can be more fully mixed with the fuel gas. On the other hand, because of the fast flow rate and small pressure, the flow rate of the fuel gas is relatively fast, and the pressure of the flow passages on both sides of the main channel 211 is small, which is also beneficial to the introduction of external air from the air introduction channels 220.

[0093] Please continue to refer to Figure 11 to Figure 13 In some embodiments, the plurality of air introduction channels 220 are arranged on both sides of the main channel 211. In this way, the air can be introduced on both sides of the main channel 211 to make the air more fully mixed with the fuel gas. As shown in Figure 13 Optionally, the air introduction inlets of the plurality of air introduction channels 220 are located in the same plane as the injection inlet 2101, and the extension directions of the plurality of air introduction channels 220 located on the same side of the main channel 211 are parallel. In this way, the air can be introduced in an orderly manner, and the air can be mixed with the fuel gas. It should be noted that Figure 11 to Figure 13 The plurality of air introduction channels 220 are arranged in a row, of course, the plurality of air introduction channels 220 can also be arranged in other forms such as a radial shape, and the extension directions of the plurality of air introduction channels 220 located on the same side of the main channel 211 can also be different, and the embodiments of the present application do not make specific limitations on this.

[0094] In order to ensure the air intake amount and facilitate the air to enter the main channel 211, in some embodiments, please continue to refer to Figure 13 The angle between the extension direction of each air introduction channel 220 and the first direction z1 is α2. Wherein, 30°≤α2≤60°.

[0095] In order to prevent the air introduction channels 220 from affecting the flow blocking effect of the backflow channels 212, in some embodiments, please continue to refer to Figure 13 Along the first direction z1, the air introduction outlet of each air introduction channel 220 is located upstream of the first backflow channel 212. In this way, because the air introduction outlet avoids the backflow channel 212, not only can the air interfere with the backflow channel 212, but also the air can be mixed with the fuel gas and enter the main channel 211.

[0096] In some embodiments, please refer to Figure 6 and Figure 13The injection channel 210 further comprises a guide channel 213 connecting the injection outlet 2102 and the output end of the main channel 211. In the first direction z1, the cross-sectional width W of the guide channel 213 gradually increases. In this way, the space provided in the manner of diffuser not only facilitates the stable delivery of the mixed gas of air and fuel gas into the accommodating cavity 103, but also increases the difficulty of the flame entering the main channel 211, further preventing backfire from entering the burner 10.

[0097] In some embodiments, referring to Figure 6 and Figure 13 , in the first direction z1, the cross-sectional area of the accommodating cavity 103 between the injection outlet 2102 and the flame outlet 101 increases. In this way, the space provided in the manner of diffuser can increase the difficulty of the flame entering the main channel 211, further preventing backfire from entering the burner 10. At the same time, the space provided facilitates better mixing of air and fuel gas, stabilizes the mixing process, and is conducive to the subsequent combustion process.

[0098] In some embodiments, referring to Figure 6 and Figure 13 , the burner 10 further comprises a flame distribution sheet 300 arranged at the flame outlet 101, and the flame distribution sheet 300 is used to distribute the mixed gas flow of air and fuel gas. In this way, the flame distribution sheet 300 can further prevent backfire from entering the burner 10. Optionally, the distance of the flame distribution sheet 300 to the inner core 200 can be set according to the actual combustion condition.

[0099] Figure 14 Fig. 6 shows a first state diagram of the second cover 202 and the second shell 120 cooperating together in another embodiment of the present application; Figure 15 Fig. 7 shows a second state diagram of the second cover 202 and the second shell 120 cooperating together in another embodiment of the present application; for the convenience of description, only the parts related to the embodiments of the present application are shown.

[0100] Thus, referring to Figure 14 and Figure 15 , and in combination with referring to Figure 7 and Figure 8, the reduction process of the flame by the backflow channel 212 and the effect process of the backflow channel 212 on the incoming fuel gas can refer to the related content of some of the foregoing embodiments, which will not be repeated here. Due to the symmetrical arrangement of the plurality of flow guide channels 220 on both sides of the main channel 211, the extension directions of the plurality of flow guide channels 220 located on the same side of the main channel 211 are the same, and the angle of the flow guide channel 220 is set to effectively mix air and fuel gas, preventing backfire due to insufficient or excessive combustion of fuel gas. It can be understood that due to the combination of the structure and arrangement of the main channel 211 and the plurality of backflow channels 212 in some of the foregoing embodiments, the structure and arrangement of the plurality of flow guide channels 220 can effectively combine the fluid dynamic characteristics of the fuel gas in the injection channel 210, prevent the situation of high fuel gas combustion potential during normal combustion, and further reduce the backfire trend when the gas water heater is turned off. Further, due to the effective mixing of the fuel gas and air, the difficulty of the flame re-entering the inner core 200 and the flow difficulty in the injection channel 210 are increased. The flame entering the injection channel 210 will also be reduced due to the presence of the backflow channel 212. In general, by using the structure of the inner core 200, the situation of backfire can be effectively prevented, and the service life of the device is improved.

[0101] Figure 16 A structure schematic diagram of a burner assembly 1 in an embodiment of the present application is shown; for ease of illustration, only parts related to the embodiments of the present application are shown.

[0102] Based on the same inventive concept, please refer to Figure 16 The embodiments of the present application provide a burner assembly 1, which comprises a plurality of burners 10 as in the above embodiments and a jet pipe 20. The jet pipe 20 is provided with a plurality of nozzles corresponding to the injection inlets 2101 one by one. Thus, due to the use of the above-mentioned burner 10, the service life of the burner assembly 1 is improved.

[0103] Figure 17 A structure schematic diagram of a gas water heater in an embodiment of the present application is shown; for ease of illustration, only parts related to the embodiments of the present application are shown.

[0104] Based on the same inventive concept, please refer to Figure 17 The embodiments of the present application provide a gas water heater, which comprises a burner assembly 1 as in the above embodiments. Due to the use of the above-mentioned burner assembly 1, the reliability of the gas water heater is improved.

[0105] Any combination of the technical features in the above embodiments can be made, and for the sake of brevity, not all possible combinations are described above, however, as long as the combination of the technical features does not exist in contradiction, it shall be considered within the scope of the present disclosure.

[0106] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it shall not be understood as a limitation on the patent scope of the present application. It shall be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these shall be within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A burner (10) characterized by, The utility model relates to a gas stove, comprising: a housing (100) provided with a fire outlet (101) at the top, an air inlet (102) at the bottom and a containing cavity (103) connecting the fire outlet (101) and the air inlet (102); and an inner core (200) arranged in the containing cavity (103), wherein the inner core (200) is provided with an ejector channel (210), the ejector inlet (2101) of the ejector channel (210) is connected to the air inlet (102) for introducing gas and air, and the ejector outlet (2102) of the ejector channel (210) is connected to the fire outlet (101); wherein the ejector channel (210) comprises a main channel (211) extending along a first direction (z1) and connected to the ejector inlet (2101) and the ejector outlet (2102), and a plurality of backflow channels (212) arranged on the sides of the main channel (211) and connected to the main channel (211); each backflow channel (212) comprises a first backflow section (2121) and a second backflow section (2122), the first end (a1) of the first backflow section (2121) is connected to the main channel (211), the second end (b1) of the first backflow section (2121) extends linearly away from the main channel (211) and towards the ejector inlet (2101), and is connected to the first end (a2) of the second backflow section (2122), the second end (b2) of the second backflow section (2122) extends arcuately towards the main channel (211) and away from the ejector inlet (2101), and the second end (b2) of the second backflow section (2122) is connected to the main channel (211); in a second direction (z2), the first end (a1) of the first backflow section (2121) is located upstream of the second end (b1) of the first backflow section (2121), and the second end (b1) of the first backflow section (2121) is located upstream of the second end (b2) of the second backflow section (2122); the second direction (z2) is opposite to the first direction (z1).

2. Burner (10) according to claim 1, characterized in that The plurality of backflow channels (212) are arranged on both sides of the main channel (211).

3. Burner (10) according to claim 2, characterized in that The plurality of backflow channels (212) are arranged alternately on both sides of the main channel (211) along the length direction of the ejector channel (210).

4. Burner (10) according to claim 1, characterized in that The angle between the linearly extending direction of the input end of the first backflow section (2121) and the first direction (z1) is α1; wherein 30°≤α1≤60°.

5. The burner (10) according to claim 1, characterized in that The diameter of the main channel (211) is d; wherein 2mm≤d≤5mm.

6. Burner (10) according to any one of claims 1-5, characterized in that The inner core (200) is further provided with a plurality of air introduction channels (220); the air introduction inlet of the air introduction channel (220) is connected to the air inlet (102), and the air introduction outlet of the air introduction channel (220) is connected to the main channel (211).

7. Burner (10) according to claim 6, characterized in that A plurality of the drainage channels (220) are symmetrically arranged on both sides of the main channel (211), and an included angle between an extension direction of each of the drainage channels (220) and the first direction (z1) is α2. Wherein, 30°≤α2≤60°.

8. Burner (10) according to claim 7, characterized in that Drainage inlets of the plurality of the drainage channels (220) are located in the same plane as the suction inlet (2101), and extension directions of the plurality of the drainage channels (220) located on the same side of the main channel (211) are parallel.

9. Burner (10) according to any one of claims 1-5, characterized in that The suction channel (210) further comprises a guide channel (213) communicating the suction outlet (2102) and an output end of the main channel (211). Along the first direction (z1), a cross-sectional width of the guide channel (213) gradually increases.

10. Burner (10) according to any one of claims 1-5, characterized in that The inner core (200) comprises a first cover (201) and a second cover (202) covering the first cover (201). The suction channel (210) is arranged on a covering surface of one of the first cover (201) and the second cover (202). Alternatively, a first channel is arranged on a covering surface of the first cover (201), and a second channel is arranged on a covering surface of the second cover (202), and the first channel and the second channel jointly constitute the suction channel (210).

11. Burner (10) according to claim 10, characterized in that The inner core (200) further comprises a sealing member (203) arranged between the first cover (201) and the second cover (202). When the suction channel (210) is arranged on the covering surface of one of the first cover (201) and the second cover (202), the sealing member (203) covers the suction channel (210). When the suction channel (210) is jointly constituted by the first channel and the second channel, the sealing member (203) is arranged on both sides of the suction channel (210).

12. Burner (10) according to any one of claims 1-5, characterized in that Along the first direction (z1), a cross-sectional width (W) of the accommodating cavity (103) between the suction outlet (2102) and the fire outlet (101) gradually increases.

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