Gas burner and stove applying same
By setting a return port and return channel in the gas burner, the shortcomings of existing gas burners in terms of primary air coefficient and combustion rate are solved, achieving efficient combustion and low-cost production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- NINGBO FOTILE KITCHEN WARE CO LTD
- Filing Date
- 2026-01-08
- Publication Date
- 2026-05-12
AI Technical Summary
Existing gas burners have problems such as high cost, large size, easy nozzle clogging, difficult processing, and flameout noise in improving primary air coefficient and gas combustion rate.
In a gas burner, a first and second return port are designed between the mixing chamber and the ejector channel, and connected through the return channel. Part of the mixed gas flows back to the ejector channel, which enhances the ejection capability of the nozzle and improves the mixing effect of gas and air.
It improves the primary air coefficient and combustion rate of the gas burner, reduces energy loss, enhances the ejection capability of the nozzle, extends service life, and reduces production costs.
Smart Images
Figure CN122015085A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of cooktops, and more particularly to a gas burner and a cooktop using the gas burner. Background Technology
[0002] Existing gas burner structures such as Figure 7 As shown: Gas with a certain pressure is ejected from nozzle 3' and enters ejector tube 2'. In the contraction section 201' of ejector tube 2', it becomes a high-speed airflow that ejects primary air, and the pressure drops to 0. In the throat section 202', it becomes a negative pressure. After passing through the diffuser section 203', the pressure gradually increases. In the mixing chamber 11', primary air and gas are mixed and finally ejected from the burner hole 4' for combustion, generating exhaust gas.
[0003] To improve combustion efficiency and reduce exhaust emissions, the effective measure for gas stove burners is to increase the primary air coefficient. To increase the primary air coefficient, the following methods are generally adopted: (1) Using two or more nozzles or two or more ejector tubes to increase the contact area between gas and primary air; (2) Lengthening the ejector tube, increasing the size of the burner, reducing energy loss, and extending the mixing time between gas and primary air; (3) Increasing the combustion area; (4) Some burners use forced draft to improve ejection capacity.
[0004] The first approach is currently the most widely adopted solution. However, multiple nozzles or multiple ejector tubes increase the size of the burner, raising costs. Furthermore, multiple nozzles (and multiple ejector tubes inherently lead to multiple nozzles) inevitably result in a smaller orifice diameter for each individual nozzle. This not only makes the nozzles prone to clogging but also significantly increases manufacturing difficulty, as a smaller orifice diameter necessitates a shallower nozzle depth, exponentially increasing processing complexity. In addition, multi-nozzle structures require compact installation, meaning the external dimensions of individual nozzles cannot be too large. In cases where a large nozzle orifice diameter is required, excessively small nozzle dimensions can result in the orifice diameter being equal to or even larger than the nozzle base diameter. This not only reduces the primary air coefficient but can even render the burner completely unusable.
[0005] The second method is currently the most effective and reliable solution to improve the primary air coefficient. However, this method will still significantly increase the cost of the burner itself. Furthermore, due to the increased size of the burner, the overall size of the unit will also increase, ultimately leading to a significant increase in the overall cost of the unit.
[0006] The main drawback of the third method is the noise during flameout, and even the problem of backfire. Products using this method have resulted in complaints and returns. The fourth method is mainly used in gas water heaters. Unlike gas water heaters, gas stoves generally have two or more burners, which requires multiple fans to blow air, leading to a significant increase in production costs. In addition, gas stoves have a smaller structure and operate in harsh environments, placing higher demands on the fans, which also increases the production cost of gas stoves. Summary of the Invention
[0007] The first technical problem to be solved by the present invention is to provide a gas burner with a high primary air coefficient, which is in contrast to the prior art.
[0008] The second technical problem to be solved by the present invention is to provide a gas burner with a high primary air coefficient and a high gas combustion rate, in contrast to the prior art.
[0009] The third technical problem to be solved by the present invention is to provide a stove having the above-mentioned gas burner, in contrast to the prior art.
[0010] The technical solution adopted to further solve at least one of the above-mentioned technical problems is as follows: a gas burner, including an ejector channel and a mixing chamber, the ejector channel including a contraction section, a diffuser section and a throat section located between the contraction section and the diffuser section, the ejector outlet of the ejector channel being connected to the mixing inlet of the mixing chamber, characterized in that the mixing chamber further has a first return port, the first return port being spaced apart from the mixing inlet along the length direction of the mixing chamber, and the ejector channel further has a second return port, the second return port being connected to the first return port through a return channel, so that gas flows back from the mixing chamber to the ejector channel and flows toward the ejector outlet.
[0011] Furthermore, the second return port is located at one of the following locations: the contraction section, the throat section, or the junction of the contraction section and the throat section. The air pressure in the contraction section is negative, the air pressure in the throat section is 0, and the air pressure in the diffusion section gradually increases with the direction of gas flow. Therefore, placing the second return port at one of the above three locations helps the mixed gas in the mixing chamber to flow back to the ejector channel and flow with the airflow in the ejector channel towards the ejector outlet.
[0012] Furthermore, the cross-sectional area of the recirculation channel increases from the first recirculation port to the second recirculation port. Designing the recirculation channel as an expansion type can reduce the flow velocity of the mixed gas in the recirculation channel, thereby increasing the gas pressure in the recirculation channel from the first recirculation port to the second recirculation port. On the one hand, this facilitates the recirculated gas flow into the original gas flow in the ejector channel, and on the other hand, it avoids excessive mixed gas flowing back from the mixing chamber to the ejector channel, thus ensuring combustion efficiency.
[0013] Furthermore, the longitudinal section of the mixing chamber is arc-shaped. The mixing inlet is located at the midpoint of the mixing chamber along its length. First return ports are respectively provided at both ends of the mixing chamber, and two second return ports correspond one-to-one with each of the first return ports. Each second return port is connected to its corresponding first return port through a return channel. This allows the gas entering from the mixing inlet to be fully mixed in the mixing chamber, and a portion of the mixed gas then flows back to the ejector channel from each of the first return ports. This helps ensure the mixing effect of the fuel gas and air. Simultaneously, placing the first return ports at the ends of the mixing chamber can interfere with the generation of vortices at each end, thereby reducing the vortex area and thus reducing energy loss caused by vortices, improving ejection capability.
[0014] Furthermore, the ejector channel extends horizontally along the centerline of the mixing inlet, while each second return port is symmetrically positioned on the sidewalls of the ejector channel with the centerline as the center. This allows the gas to flow smoothly in the mixing chamber, ensuring effective mixing of air and fuel gas. The symmetrical arrangement of return channels on both sides of the ejector channel allows for better entrainment of primary air by the two return airflows, further enhancing the nozzle's ability to eject primary air.
[0015] Furthermore, each of the aforementioned return channels extends obliquely towards the ejector outlet from its first return port to its second return port. This guides the airflow entering the ejector channel from the return channel towards the ejector outlet, better ensuring that the return airflow flows towards the ejector outlet, thereby guaranteeing the entrainment effect of the return airflow on the primary air.
[0016] Furthermore, the mixing chamber has a rectangular cross-section. The mixing inlet is located on the inner wall of the lower part of the mixing chamber, while each first return port is located at the lower end of each end wall of the mixing chamber. Additionally, mixing outlets are spaced circumferentially on the top wall of the mixing chamber. This vertically extending design, with the mixing inlet and first return ports located at the lower part of the mixing chamber and the mixing outlets at the top, avoids the influence of the first return ports on the gas exiting the mixing chamber, ensuring smooth flow of the mixed gas from the mixing outlets. Moreover, during operation, the temperature of the mixed gas in the mixing chamber increases from bottom to top (the upper end is closer to the combustion flame than the lower end). This allows the lower-temperature portion of the mixed gas to return through the first return ports, helping to increase the overall temperature of the mixed gas in the mixing chamber, thereby increasing the temperature of the gas exiting the mixing outlets and ultimately improving combustion efficiency.
[0017] Furthermore, it also includes a mixing seat with an annular outer mixing groove. The top of the outer mixing groove is open, and an outer ring flame cap surrounds it circumferentially to form an outer annular mixing chamber. An outer annular air inlet is formed on the bottom wall of the outer annular mixing groove, and each outer annular air inlet corresponds one-to-one with the mixing outlet, with each outer annular air inlet in fluid communication with its corresponding mixing outlet. In this way, the mixed gas in the mixing chamber can smoothly enter the outer annular mixing chamber and burn at the flame hole of the outer annular flame cap.
[0018] Furthermore, it also includes a cylindrical base and an ejector tube. The inner cavity of the ejector tube forms the ejection channel, while one side of the base has an axially penetrating notch, and the side wall of the base is hollow to form the mixing chamber. The ejector tube passes radially through the notch, and the ejector outlet end of the ejector tube is fixed to the base. The gaps between the outer surface of the ejector tube and the inner surfaces of the base on both sides are shielded by horizontally extending first bottom walls, and each return channel is constructed in the corresponding first bottom wall. This allows the base and ejector tube to be integrated, making the overall structure of the gas burner robust. Integrating each return channel into the corresponding first bottom wall facilitates manufacturing and ensures a robust structure at each return channel, preventing damage during use (if a pipe structure is involved, the smaller pipe diameter makes it prone to damage during use), thus helping to extend the service life of the gas burner.
[0019] Furthermore, the mixing seat is also provided with an inner ring mixing groove with a circular cross-section. This inner ring mixing groove is centrally located in the central hole of the outer ring mixing groove, and its top is open, covering a disc-shaped inner ring flame cap to form an inner ring mixing chamber. The inner ring mixing groove has circumferentially spaced inner ring air inlets, while the outer ring mixing groove has circumferentially spaced air vents on its inner ring wall. These air vents correspond one-to-one with the inner ring air inlets, and each air vent is connected to its corresponding inner ring air inlet via a radially extending air pipe. In this way, the mixed gas in the mixing chamber can smoothly enter the inner ring mixing chamber through the outer ring mixing chamber for combustion at the flame hole of the inner ring flame cap.
[0020] Furthermore, the mixing seat includes an annular outer ring mixing seat and a cylindrical inner ring mixing seat with a closed bottom. The top of the outer ring mixing seat is concave downwards along the circumference to form the outer ring mixing groove, while the interior of the inner ring mixing seat constitutes the inner ring mixing groove.
[0021] Furthermore, the mixing seat is positioned directly on the base, and the edges of each mixing outlet extend vertically upwards in the circumferential direction to form an outlet pipe. The upper end of each outlet pipe is connected to the corresponding outer ring inlet, and a secondary air inlet is defined between adjacent outlet pipes, located between the mixing seat and the base. On the one hand, this ensures reliable communication between each mixing outlet and the corresponding outer ring inlet; on the other hand, by forming a secondary air inlet, secondary air can be supplied to the combustion flame at the inner ring burner, thereby ensuring the combustion efficiency of the fuel gas at the inner ring burner.
[0022] The technical solution adopted to further solve the third technical problem mentioned above is: a stove, characterized in that it includes a gas burner as described above.
[0023] Compared with the prior art, the advantages of this invention are as follows: the mixing chamber is provided with a first return port, and the ejector channel is provided with a second return port. The first and second return ports are connected through the return channel. In this way, part of the mixed gas in the mixing chamber can flow back to the ejector channel through the return channel and flow towards the ejector outlet, thereby entraining a portion of primary air and enhancing the nozzle's ability to eject primary air, thus improving the primary air coefficient. Furthermore, the mixed gas flowing back to the ejector channel and being ejected again into the mixing chamber through the ejector channel helps to improve the mixing effect of fuel gas and air, thereby improving the combustion rate of the fuel gas. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the structure of the gas burner in an embodiment of the present invention;
[0025] Figure 2 for Figure 1 A structural diagram from another direction;
[0026] Figure 3 for Figure 1 A structural diagram in another direction;
[0027] Figure 4 for Figure 2 A cross-sectional view along the AA direction;
[0028] Figure 5 This is an exploded view of the gas burner in an embodiment of the present invention;
[0029] Figure 6 This is a cross-sectional view of the gas burner in another direction in an embodiment of the present invention;
[0030] Figure 7 This is a schematic diagram of the structure and gas pressure changes of a gas burner in the prior art. Detailed Implementation
[0031] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.
[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this invention can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.
[0033] A stove (specifically a gas stove in this embodiment) includes a gas burner, such as Figures 1-6 As shown, the gas burner includes an ejector channel 20 and a mixing chamber 11. The ejector channel 20 includes a contraction section 201, a diffuser section 203, and a throat section 202 located between the contraction section 201 and the diffuser section 203. The ejector outlet 22 of the ejector channel 20 is connected to the mixing inlet 111 of the mixing chamber 11 (the ejector outlet 22 and the mixing inlet 111 coincide, as shown). Figure 4 and Figure 6 (As shown). Among them, the ejector inlet 21 of the ejector channel 20 is equipped with a nozzle 3.
[0034] Furthermore, the mixing chamber 11 also has a first return port 41, which is spaced apart from the mixing inlet 111 along the length of the mixing chamber 11. The ejector channel 20 also has a second return port 42, which is connected to the first return port 41 through the return channel 4, so that the gas flows back from the mixing chamber 11 to the ejector channel 20 and flows toward the ejector outlet 22.
[0035] As can be seen from the above, in this invention, the mixing chamber 11 is provided with a first return port 41, and the ejector channel 20 is provided with a second return port 42. The first return port 41 and the second return port 42 are connected through the return channel 4. In this way, part of the mixed gas in the mixing chamber 11 can flow back to the ejector channel 20 through the return channel 4 and flow towards the ejector outlet 22, thereby entraining a portion of the primary air and helping to enhance the ability of the nozzle 3 to eject primary air. Furthermore, the mixed gas flows back to the ejector channel 20 and is ejected by the ejector channel 20 to re-enter the mixing chamber 11 for mixing, which helps to improve the mixing effect of fuel gas and air, thereby improving the combustion rate of the fuel gas.
[0036] Furthermore, the second return port 42 is located at one of the following locations: the contraction section 201, the throat section 202, or the junction of the contraction section 201 and the throat section 202. The pressure in the contraction section 201 is negative, the pressure in the throat section 202 is 0, and the pressure in the diffuser section 203 gradually increases with the gas flow direction. Therefore, placing the second return port 42 at one of these three locations helps the mixed gas in the mixing chamber 11 to return to the ejector channel 20 and flow towards the ejector outlet 22 with the airflow in the ejector channel 20. In this embodiment, as... Figure 6 As shown, preferably, the second reflux port 42 is located at the junction of the contraction section 201 and the throat section 202.
[0037] Furthermore, such as Figure 6 As shown, the cross-sectional area of the aforementioned return channel 4 increases from the first return port 41 to the second return port 42. Designing the return channel 4 as an expanding type reduces the flow velocity of the mixed gas in the return channel 4, thereby causing the gas pressure in the return channel 4 to increase from the first return port 41 to the second return port 42. This facilitates the return airflow merging into the original airflow in the ejector channel 20, and also prevents excessive mixed gas from flowing back from the mixing chamber 11 to the ejector channel 20, thus ensuring combustion efficiency.
[0038] Furthermore, such as Figure 6As shown, the longitudinal section of the mixing chamber 11 is arc-shaped. The mixing inlet 111 is located at the midpoint of the mixing chamber 11 along its length. First return ports 41 are respectively provided at both ends of the mixing chamber 11, and two second return ports 42 are provided, each corresponding to one of the first return ports 41. Each second return port 42 is connected to its corresponding first return port 41 via a return channel 4. In this way, the gas entering from the mixing inlet 111 can be fully mixed in the mixing chamber 11, and a portion of the mixed gas then flows back to the ejector channel 20 from each of the first return ports 41. This helps to ensure the mixing effect of the fuel gas and air. Simultaneously, placing each first return port 41 at the end of the mixing chamber 11 can interfere with the generation of vortices at each end, thereby reducing the vortex area and thus reducing energy loss caused by vortices, improving ejection capability. In this embodiment, preferably, the included angle between the two end walls of the mixing chamber 11 is an acute angle; more preferably, the acute angle is 70°.
[0039] Furthermore, such as Figure 6 As shown, the ejector channel 20 extends horizontally along the centerline of the mixing inlet 111, while each second return port 42 is symmetrically arranged on both sides of the ejector channel 20 with the centerline as the center. This allows the gas to flow smoothly in the mixing chamber 11, ensuring the mixing effect of air and fuel gas. Furthermore, the symmetrical arrangement of return channels 4 on both sides of the ejector channel 20 allows the two return airflows to better entrain primary air, thus enhancing the ejector 3's ability to eject primary air.
[0040] Furthermore, each of the aforementioned return channels 4 extends obliquely towards the ejector port 22 from its first return port 41 to its second return port 42. Figure 6 As can be seen, the angle α between the centerline of the ejector channel 20 and the centerline of each return channel 4 is less than 90° (in this embodiment, the angle α is specifically 85°). Furthermore, in the longitudinal section of each return channel 4, the angle between the first side and the vertical direction is greater than the angle between the second side and the vertical direction, wherein the first side is adjacent to the ejector outlet 22 of the ejector channel 20. This guides the airflow entering the ejector channel 20 from the return channel 4 to the ejector outlet 22, better ensuring that the return airflow flows towards the ejector outlet 22, thereby ensuring the entrainment effect of the return airflow on the primary air.
[0041] Furthermore, such as Figure 4As shown, the mixing chamber 11 has a rectangular cross-section. The mixing inlet 111 is located on the inner wall of the lower part of the mixing chamber 11, while each first return port 41 is located at the lower end of each end wall of the mixing chamber 11. Furthermore, mixing outlets 112 are provided circumferentially at intervals on the top wall of the mixing chamber 11. In this way, the mixing chamber 11 extends vertically, with the mixing inlet 111 and the first return port 41 both located at the lower part of the mixing chamber 11, and the mixing outlets 112 located at the top of the mixing chamber 11. This avoids the first return ports 41 affecting the gas output from the mixing chamber 11 and ensures that the mixed gas in the mixing chamber 11 flows smoothly out from the mixing outlets 112. Furthermore, during operation, the temperature of the mixed gas in the mixing chamber 11 increases from bottom to top (the upper end is closer to the combustion flame than the lower end). This allows the lower-temperature portion of the mixed gas to return from the first return port 41, which helps to increase the overall temperature of the mixed gas in the mixing chamber 11, thereby increasing the temperature of the gas flow at the mixing outlet 112 and thus improving combustion efficiency.
[0042] Furthermore, such as Figure 1 and Figure 4 As shown, it also includes a mixing seat 5, which has an annular outer mixing groove 510. The top of the outer mixing groove 510 is open, and it is surrounded by an outer ring flame cap 8 to form an outer ring mixing chamber 511. An outer ring air inlet 5101 is opened on the bottom wall of the outer ring mixing groove 510. The outer ring air inlet 5101 corresponds one-to-one with the aforementioned mixing outlet 112, and each outer ring air inlet 5101 is in fluid communication with the corresponding mixing outlet 112. In this way, the mixed gas in the mixing chamber 11 can smoothly enter the outer ring mixing chamber 511 and burn at the flame hole of the outer ring flame cap 8.
[0043] Furthermore, such as Figure 1 , Figure 4 as well as Figure 5 As shown, it also includes a cylindrical base 1 and an ejector tube 2. The inner cavity of the ejector tube 2 forms the ejection channel 20. One side of the base 1 has an axially penetrating notch 10, and the sidewall of the base 1 is hollow, forming the mixing chamber 11. The ejector tube 2 passes radially through the notch 10. Furthermore, the ejection outlet 22 of the ejector tube 2 is fixed to the base 1, and the gaps between the outer surface of the ejector tube 2 and the inner surfaces of the base 1 on both sides are shielded by horizontally extending first bottom walls 7. Each return channel 4 is constructed in a corresponding first bottom wall 7 (e.g., ...). Figure 3(As shown). This allows the base 1 and the ejector channel 20 to form an integral unit, making the overall structure of the gas burner robust. Furthermore, each return channel 4 is integrated into the first bottom wall 7 on the corresponding side. This facilitates manufacturing and ensures the robust structure of each return channel 4, preventing damage during use (if designed as a pipe structure, the pipe diameter would be too small, making it prone to damage during use), thus helping to extend the service life of the gas burner.
[0044] Furthermore, such as Figure 5 As shown, the aforementioned mixing seat 5 is also provided with an inner ring mixing groove 520 with a circular cross-section. The inner ring mixing groove 520 is centrally located in the central hole of the outer ring mixing groove 510, and the top of the inner ring mixing groove 520 is open, covering the disc-shaped inner ring flame cap 9 to form an inner ring mixing chamber 521. The peripheral wall of the inner ring mixing groove 520 is provided with inner ring air inlets 5201 spaced apart circumferentially, and the inner ring wall of the outer ring mixing groove 510 is provided with vents 5102 spaced apart circumferentially. The vents 5102 correspond one-to-one with the inner ring air inlets 5201, and each vent 5102 is connected to the corresponding inner ring air inlet 5201 through a radially extending vent pipe 53. In this way, the mixed gas in the mixing chamber 11 can smoothly enter the inner ring mixing chamber 521 through the outer ring mixing chamber 511 to burn at the flame hole of the inner ring flame cap 9.
[0045] Furthermore, such as Figure 5 As shown, the aforementioned mixing seat 5 includes an annular outer ring mixing seat 51 and a cylindrical inner ring mixing seat 52 with a closed bottom. The top of the outer ring mixing seat 51 is concave downwards along the circumference to form the aforementioned outer ring mixing groove 510, while the interior of the inner ring mixing seat 52 forms the aforementioned inner ring mixing groove 520. Furthermore, the mixing seat 5 is positioned directly on the base 1, and the edges of each mixing outlet 112 extend vertically upwards along the circumference to form an outlet pipe 12. The upper end of each outlet pipe 12 is connected to the corresponding outer ring inlet 5101, and a secondary air inlet 6 is defined between adjacent outlet pipes 12, located between the mixing seat 5 and the base 1. This ensures reliable communication between each mixing outlet 112 and the corresponding outer ring inlet 5101. Furthermore, by forming the secondary air inlet 6, secondary air can be supplied to the combustion flame at the inner ring burner cap 9, thereby ensuring the combustion efficiency of the fuel gas at the inner ring burner cap 9.
[0046] In another embodiment, the stove in this invention can be controlled by a voice module, which is equipped with a controller, a voice receiving module, and a voice parsing module. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller controls the stove to perform corresponding operations, thereby realizing intelligent control of the stove and improving the user experience.
[0047] The term "fluid connectivity" as used in this invention refers to the spatial relationship between two components or parts (hereinafter collectively referred to as the first part and the second part, respectively), that is, a fluid (gas, liquid, or a mixture of both) can flow from the first part along a flow path and / or be transported to the second part. This can be a direct connection between the first part and the second part, or an indirect connection between the first part and the second part through at least one third party. This third party can be a fluid channel such as a pipe, channel, conduit, guide, hole, or groove, or a chamber that allows fluid to flow through, or a combination of the above.
Claims
1. A gas burner comprising an ejector channel (20) and a mixing chamber (11), the ejector channel (20) comprising a contraction section (201), a diffuser section (203), and a throat section (202) located between the contraction section (201) and the diffuser section (203), wherein the ejector outlet (22) of the ejector channel (20) is connected to the mixing inlet (111) of the mixing chamber (11), characterized in that, The mixing chamber (11) also has a first return port (41), which is spaced apart from the mixing inlet (111) along the length of the mixing chamber (11). The ejector channel (20) also has a second return port (42), which is connected to the first return port (41) through a return channel (4) so that gas flows back from the mixing chamber (11) to the ejector channel (20) and flows toward the ejector outlet (22).
2. The gas burner as described in claim 1, characterized in that, The second reflux port (42) is located at one of the following locations: the contraction section (201), the throat section (202), or the junction of the contraction section (201) and the throat section (202).
3. The gas burner as described in claim 1, characterized in that, The cross-sectional area of the return channel (4) increases from the first return port (41) to the second return port (42).
4. The gas burner according to any one of claims 1 to 3, characterized in that, The longitudinal section of the mixing chamber (11) is arc-shaped. The mixing inlet (111) is located at the midpoint of the mixing chamber (11) along its own length. The ends of the mixing chamber (11) are respectively provided with the first return port (41). There are two second return ports (42) and they correspond one-to-one with each of the first return ports (41). Each second return port (42) is connected to the corresponding first return port (41) through the return channel (4).
5. The gas burner as described in claim 4, characterized in that, The ejector channel (20) extends horizontally along the centerline of the mixing inlet (111), and each second return port (42) is symmetrically opened on both sides of the ejector channel (20) with the centerline of the ejector channel (20) as the center.
6. The gas burner as described in claim 5, characterized in that, Each of the aforementioned return channels (4) extends obliquely toward the ejector port (22) from its first return port (41) to its second return port (42).
7. The gas burner as described in claim 4, characterized in that, The mixing chamber (11) has a rectangular cross-section. The mixing inlet (111) is located on the inner side wall of the lower part of the mixing chamber (11), and each first return port (41) is located at the lower end of each end wall of the mixing chamber (11). Furthermore, the top wall of the mixing chamber (11) is provided with mixing outlets (112) spaced circumferentially.
8. The gas burner as described in claim 7, characterized in that, It also includes a mixing seat (5), which has an annular outer ring mixing groove (510) on it. The top of the outer ring mixing groove (510) is open and is surrounded by an outer ring flame cap (8) to form an outer ring mixing chamber (511). An outer ring air inlet (5101) is opened on the bottom wall of the outer ring mixing groove (510). The outer ring air inlet (5101) corresponds one-to-one with the mixing outlet (112), and each outer ring air inlet (5101) is fluidly connected to the corresponding mixing outlet (112).
9. The gas burner as described in claim 8, characterized in that, It also includes a cylindrical base (1) and an ejector tube (2). The inner cavity of the ejector tube (2) forms the ejection channel (20). The base (1) has an axially penetrating notch (10) on one side. The side wall of the base (1) is hollow to form the mixing chamber (11). The ejector tube (2) is inserted into the notch (10) radially along the base (1). The ejector outlet (22) end of the ejector tube (2) is fixed to the base (1). The gap between the outer side of the ejector tube (2) and the inner side of the base (1) on both sides is shielded by the horizontally extending first bottom wall (7). Each return channel (4) is constructed in the corresponding first bottom wall (7).
10. The gas burner as claimed in claim 9, characterized in that, The mixing seat (5) is also provided with an inner ring mixing groove (520) with a circular cross-section. The inner ring mixing groove (520) is centrally located in the central hole of the outer ring mixing groove (510). The top of the inner ring mixing groove (520) is open and is covered by a disc-shaped inner ring flame cap (9) to form an inner ring mixing chamber (521). The inner ring mixing groove (520) is provided with an inner ring air inlet (5201) spaced apart along the circumferential direction on the peripheral wall of the inner ring mixing groove (520). The outer ring mixing groove (5102) is provided with an air vent (5102) spaced apart along the circumferential direction on the inner ring wall of the outer ring mixing groove (510). The air vent (5102) corresponds one-to-one with the inner ring air inlet (5201). Each air vent (5102) is connected to the corresponding inner ring air inlet (5201) through a radially extending air pipe (53).
11. The gas burner as claimed in claim 10, characterized in that, The mixing seat (5) includes an annular outer ring mixing seat (51) and a cylindrical inner ring mixing seat (52) with a closed bottom. The top of the outer ring mixing seat (51) is concave downward along the circumference to form the outer ring mixing groove (510), while the interior of the inner ring mixing seat (52) forms the inner ring mixing groove (520). Furthermore, the mixing seat (5) is positioned directly above the base (1), and the edges of each mixing outlet (112) extend vertically upward in the circumferential direction to form an outlet pipe (12). The upper end of each outlet pipe (12) is connected to the corresponding outer ring inlet (5101), and a secondary air inlet (6) is defined between adjacent outlet pipes (12) located between the mixing seat (5) and the base (1).
12. A stove, characterized in that, Including the gas burner as described in any one of claims 1 to 11.