A burner for a gas hob

Abstract

The application relates to a burner for a gas stove, which comprises a mounting base, a base arranged on the mounting base, and a fire cover arranged on the base and forming a mixing chamber together with the base, wherein the base is annular and comprises an inner annular wall and an outer annular wall arranged at intervals, the fire cover comprises an annular body, the inner side edge and the outer side edge of the annular top wall of the body respectively extend downward and are provided with an inner wall and an outer wall which are connected with the inner annular wall and the outer annular wall, and at least two main fire holes are arranged on the annular top wall and are communicated with the mixing chamber; the burner further comprises an injection pipe and a nozzle base, compared with the prior art, the burner has the advantages that the base and the injection pipe connected with the base are arranged on the mounting base, the length of the injection pipe can be adjusted according to the combustion load of the fire cover, and yellow flame is not easy to occur.

Description

Technical Field

[0001] This invention relates to the field of household kitchen appliances technology, and more particularly to a burner for a gas stove. Background Technology

[0002] Currently, many gas stoves are using top-intake burners. Because top-intake burners draw both primary and secondary air from the top of the cooktop, the stove's base can be completely sealed. Compared to traditional bottom-intake burners, top-intake burners are not only safer to use but also effectively solve the problem of flameout caused by opening and closing cabinet doors. However, traditional top-intake burners replenish primary air through the gap between the mixing chamber and the base. This gap can lead to an unsightly burner and allow liquid to seep into the base, making cleaning difficult and potentially affecting the burner's normal operation if the liquid is not properly removed.

[0003] For example, the Chinese utility model patent with patent number ZL201020579358.1 (authorization announcement number CN2018586642U) discloses "A Fully Top-Intake Burner", which includes a burner head seat, a burner cover seat, a central burner cover and an outer ring burner cover. The burner cover seat includes an upper burner cover seat, a lower burner cover seat and a central air supply hole. There is a primary air intake gap between the lower burner cover seat and the burner head seat, and the primary air intake gap is located above the panel. For example, the "Fully Top-Intake Stove Burner" disclosed in Chinese Utility Model Patent No. ZL201120527929.1 (Authorization Announcement No. CN 202392799U) includes an upper seat and a lower seat. The lower seat is used to connect the gas, and the upper seat is located above the lower seat to inject the gas for combustion. There is a primary air intake gap between the upper and lower seats. An ejector tube and a nozzle are provided between the upper and lower seats, with the nozzle connected to the lower seat and opposite to the air inlet of the ejector tube. It can be seen that the above two types of fully top-intake burners supplement primary air through the gap between the lower seat and the burner head seat and the gap between the upper and lower seats, respectively, and their structure needs further improvement.

[0004] To eliminate the problem of overflow blockage caused by gaps, the applicant provides a Chinese invention patent application, such as patent application number CN201810241590.5 (publication number CN110296402A), entitled "A Burner for a Gas Stove". This patent application provides an annular air replenishment ring for replenishing primary air, which is provided below the burner cap and above the base. The annular air replenishment ring has a primary air hole on its annular peripheral wall. The primary air hole communicates with the cavity to form a primary air channel. Although there is no gap between the burner cap and the base, primary air can be replenished without gaps. In addition, the primary air hole can be hidden below the annular peripheral wall or top wall of the annular air replenishment ring, which can effectively avoid being blocked by overflow. However, this burner still has the following drawbacks: First, the injector and nozzle of the burner are located inside the cup, which may cause the injector to be too long due to the height limitation of the cup, resulting in a yellow flame; Second, the combustion heat generated by the burner during cooking cannot be effectively concentrated, so in addition to heating the pot, a considerable portion of the heat energy generated by the gas combustion escapes into the surrounding environment, resulting in energy waste. Therefore, further limitations need to be imposed on the existing burner. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a burner for a gas stove that is less prone to producing yellow flames, in light of the aforementioned existing technology.

[0006] The second technical problem to be solved by the present invention is to provide a burner for a gas stove that can better improve combustion efficiency, in light of the above-mentioned existing technology.

[0007] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: the burner for a gas stove includes...

[0008] Mounting base;

[0009] A base is mounted on this mounting bracket;

[0010] A flame cap is mounted on the base and together with the base forms a mixing chamber.

[0011] Its features are:

[0012] The base is annular and includes an inner ring wall and an outer ring wall spaced apart. Correspondingly, the flame cap includes an annular body. The inner edge and outer edge of the annular top wall of the body extend downward to form an inner wall that engages with the inner ring wall and an outer wall that engages with the outer ring wall, respectively. At least two main flame holes communicating with the mixing chamber are provided on the annular top wall.

[0013] An ejector tube, disposed on the mounting base, has its outlet connected to the mixing chamber, while its inlet faces the injector; and

[0014] A nozzle seat is also provided on the mounting base, and the injector is provided on the nozzle seat.

[0015] Furthermore, the ejector tube is L-shaped and has a first tube and a second tube that are interconnected. The inlet of the first tube is the air inlet, and the end of the second tube is connected to the mixing chamber. Since the ejector tube is mounted on the mounting base, its length can be adjusted according to the combustion load of the burner cap. Additionally, because the first and second tubes of the ejector tube are approximately L-shaped, its length can be maximized within a small installation space. Of course, different distribution patterns can also be selected according to different burner cap arrangements.

[0016] To improve the mixing degree of the fuel gas and primary air in the ejector tube, preferably, the cross-section of the first tube body is divided into a narrowing section and an expanding section along the flow direction of the airflow, the outlet of the ejector tube is located at the end of the second tube body, and the second tube body gradually expands from the expanding section to its end. The narrowing section accelerates the intake speed of the gas and primary air, while the expansion section of the first tube and the gradually widening second tube form a similar "buffer chamber structure." This provides a buffer space for the primary air / gas mixture ejected from the first tube of the ejector. After being uniformly mixed by the buffer chamber structure, the primary air is then mixed with the gas and primary air before entering the second tube. This prevents the gas and primary air from colliding from different directions, further improving the uniformity of the primary air-gas mixture and increasing the primary air intake rate. It also effectively reduces kinetic energy loss and ensures uniform diffusion, thus maintaining a stable and uniform flame in the flame area supplied by the mixing chamber to the burner cap. This results in a short, uniform, and powerful flame in the burner, without defects such as yellow flame or backfire. Finally, the mixing chamber and burner cap of this invention are easy to disassemble and install, facilitating cleaning for the user.

[0017] Furthermore, the annular top wall is provided with at least two fire outlet zones along the circumference, each fire outlet zone is filled with fire outlet holes, and the included angle α between the tangents of adjacent fire outlet zones is an obtuse angle. Since the included angle α between the tangents of adjacent fire outlet zones, on the one hand, the success rate of fire transmission between adjacent fire outlet zones can be improved, and on the other hand, it is convenient to set the number and angle of the main fire holes on each fire outlet zone.

[0018] To better replenish secondary air to each fire exit zone, preferably, each fire exit zone gradually slopes downwards from the inside out. Each fire exit zone is replenished with secondary air from the outside in; since the outer edges of each fire exit zone are lower, this inward replenishment is more effective.

[0019] Furthermore, the area at the angle between the tangents of adjacent fire zones is at least partially free of the aforementioned fire outlets. This provides space for overflowing liquid to drain and reduces heat conduction to the corresponding pot supports.

[0020] To address the second technical problem, preferably, the mounting base is provided with a heat insulation cover around the burner cap, the heat insulation cover enclosing the mixing chamber, and the ejector tube and nozzle seat are both disposed within the heat insulation cover. The heat insulation cover can concentrate the combustion heat generated by the burner cap during cooking, improving the combustion efficiency of the burner cap; on the other hand, the heat insulation cover can also serve as a protective cover for the ejector tube and nozzle seat, preventing them from being affected by spillage.

[0021] To better reflect heat energy and prevent obstruction of airflow, preferably, the diameter of the inner edge of the heat shield is larger than the diameter of the outer edge of the mixing chamber, with a difference of 13 to 21 mm. That is, the radial gap δ between the inner edge of the heat shield and the outer edge of the mixing chamber in the burner is 6.5 to 10.5 mm.

[0022] Furthermore, a liquid collection tray is provided below the gas mixing chamber, which serves as the mounting base.

[0023] Compared with the prior art, the advantages of the present invention are: 1. The base is set on the mounting base and the ejector tube connected to it is also set on the mounting base. In this way, the length of the ejector tube can be adjusted according to the combustion load of the burner cap, and yellow flame is less likely to occur; 2. The mixing chamber and the burner cap of the present invention are easy to disassemble and install, which is convenient for users to clean; 3. After the user removes the burner cap and the base, the mounting base is a flat surface, which is also conducive to the user to clean the mounting base. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the burner and heat shield placed on the mounting base in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the flame cover at one angle in an embodiment of the present invention;

[0026] Figure 3 This is a structural schematic diagram of the flame cover from another angle in an embodiment of the present invention;

[0027] Figure 4 for Figure 1 The structural diagram of the heat shield is omitted.

[0028] Figure 5 for Figure 4 A sectional view;

[0029] Figure 6 for Figure 1 A cross-sectional view from another angle. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] like Figures 1-6 The diagram shows the preferred embodiment of the present invention. The burner for a gas stove in this embodiment includes a mounting base 1, a base 2 disposed on the mounting base 1, and a burner cap 3 disposed on the base 2 and forming a mixing chamber 34 together with the base 2. The mounting base 1 is a liquid collection tray. In addition, the base 2 in this embodiment is annular and includes an inner annular wall 21 and an outer annular wall 22 disposed at intervals. Correspondingly, the burner cap 3 includes an annular body 31. The inner edge and outer edge of the annular top wall 30 of the body 31 extend downward to form an inner wall 32 that engages with the inner annular wall 21 and an outer wall 33 that engages with the outer annular wall 22, respectively. At least two main flame holes 301 communicating with the mixing chamber 34 are provided on the annular top wall 30. An ejector tube 4 is also provided on the mounting base 1. The outlet 42 of the ejector tube 4 is connected to the mixing chamber 34, and the inlet 41 of the ejector tube 4 is opposite to the injector 5. A nozzle seat 7 is also provided on the mounting base 1, and an injector 5 is provided on the nozzle seat 7.

[0032] In this embodiment, the ejector tube 4 is L-shaped and has a first tube body 4a and a second tube body 4b that are interconnected. The inlet of the first tube body 4a is the air inlet 41, and the end of the second tube body 4b is connected to the mixing chamber 34. Since the ejector tube 4 is mounted on the mounting base 1, its length can be adjusted according to the combustion load of the burner cap 3. In addition, since the first tube body 4a and the second tube body 4b of the ejector tube 4 are approximately L-shaped, the length can be maximized in a small installation space. Of course, different distribution patterns can also be selected according to different burner cap 3 arrangements. Furthermore, in order to improve the mixing degree of the fuel gas and primary air in the ejector tube 4, the cross-section of the first tube body 4a in this embodiment is divided into a narrowing section 41a and an expanding section 42a along the airflow direction. The air outlet 42 of the ejector tube 4 is located at the end of the second tube body 4b, and the second tube body 4b gradually expands from the expanding section 42a towards its end. The narrowing section 41a accelerates the intake speed of the gas and primary air, while the expansion section 42a of the first tube 4a and the gradually expanding second tube 4b form a similar "buffer chamber structure." This allows the primary air / gas mixture ejected from the first tube 4a of the ejector tube 4 to have a buffer space. After being uniformly mixed by the buffer chamber structure, the primary air is then mixed with the gas and primary air before entering the second tube 4b. This prevents the gas and primary air from colliding with each other from different directions, further improving the uniformity of the primary air-gas mixture and increasing the primary air intake rate. It also effectively reduces kinetic energy loss and ensures uniform diffusion, thereby maintaining a stable and uniform flame in the ignition area supplied by the mixing chamber 34 to the burner cap 3. This results in a short, uniform, and powerful flame in the burner, without defects such as yellow flame or backfire. Finally, both the mixing chamber 34 and the burner cap 3 of this invention are easy to disassemble and install, facilitating cleaning by the user. In addition, the annular top wall 30 is provided with at least two fire outlet zones along the circumference, and each fire outlet zone is filled with main fire holes 301. The included angle α between the tangents of adjacent fire outlet zones is an obtuse angle. Since the included angle α between the tangents of adjacent fire outlet zones can improve the success rate of fire transmission between adjacent fire outlet zones, and facilitate the setting of the number and angle of main fire holes 301 in each fire outlet zone.

[0033] To better supply secondary air to each fire zone, each fire zone slopes downwards gradually from the inside out. Secondary air is supplied to each fire zone from the outside in, and because the outer edges of each fire zone are lower, this inward supply is more efficient. At least partially, no main flame holes are provided in the area where the tangents of adjacent fire zones meet. This provides space for overflow discharge and reduces heat transfer to the corresponding pot supports. Finally, to concentrate the combustion heat generated during the combustion process of the flame cap 3, a heat insulation cover 6 is provided around the flame cap 3 on the mounting base 1. Figure 1 and 6As shown, a heat shield 6 surrounds the mixing chamber 34, and the injector tube 4 and nozzle seat are both located inside the heat shield 6. The heat shield 6 can concentrate the combustion heat generated by the burner cap 3 during cooking, improving the combustion efficiency of the burner cap 3; on the other hand, the heat shield 6 can also serve as a protective cover for the injector tube 4 and nozzle seat, preventing them from being affected by spillage. The diameter of the inner edge of the heat shield 6 is larger than the outer edge diameter of the mixing chamber 34, with a difference of 15 mm. That is, the radial gap δ between the inner edge of the heat shield 6 and the outer edge of the mixing chamber 34 in the burner is 7.5 mm. This radial gap δ is designed to better reflect heat energy and prevent obstruction of airflow.

Claims

1. A burner for gas stove, comprising a mounting base (1) ; a base (2) arranged on the mounting base (1) ; a fire cover (3) arranged on the base (2) and forming a mixing chamber (34) together with the base (2) ; characterized in that: the base (2) is annular and comprises an inner annular wall (21) and an outer annular wall (22) arranged in a spaced apart manner, and the fire cover (3) comprises an annular body (31), the inner side edge and the outer side edge of the annular top wall (30) of the annular body (31) extend downwardly and are provided with an inner wall (32) and an outer wall (33) which are in engagement with the inner annular wall (21) and the outer annular wall (22) respectively, and at least two main fire holes (301) are formed in the annular top wall (30) and are in communication with the mixing chamber (34) ; an ejector pipe (4) arranged on the mounting base (1), the gas outlet (42) of the ejector pipe (4) is in communication with the mixing chamber (34), and the gas inlet (41) of the ejector pipe (4) is opposite to the injector (5) ; and a nozzle base (7) also arranged on the mounting base (1), and the injector (5) is arranged on the nozzle base (7).

2. Burner for gas hobs according to claim 1, characterized in that: The ejector pipe (4) is L-shaped and has a first pipe body (4a) and a second pipe body (4b) which are in communication with each other, the inlet of the first pipe body (4a) is the gas inlet (41), and the end of the second pipe body (4b) is in communication with the mixing chamber (34).

3. Burner for gas hobs according to claim 2, characterized in that: The cross section of the first pipe body (4a) is sequentially divided into a narrowing section (41a) and an expanding section (42a) along the flow direction of the gas flow, the gas outlet (42) of the ejector pipe (4) is located at the end of the second pipe body (4b), and the second pipe body (4b) gradually expands from the expanding section (42a) to the end thereof.

4. Burner for gas hobs according to claim 3, characterized in that: The annular top wall (30) is provided with at least two fire outlet areas along the circumferential direction, each fire outlet area is covered with the main fire holes (301), and the included angle α of the tangent lines of adjacent fire outlet areas is obtuse.

5. Burner for gas hobs according to claim 4, characterized in that: Each fire outlet area gradually inclines downwardly from inside to outside.

6. Burner for gas hobs according to claim 5, characterized in that: The region of the included angle of the tangent lines of adjacent fire outlet areas is at least partially not provided with the main fire holes (301).

7. Burner for gas hobs according to any of the claims from 1 to 6, characterized in that: The mounting base (1) is provided with a heat shield (6) around the periphery of the fire cover (3), the heat shield (6) surrounds the mixing chamber (34), and the ejector pipe (4) and the nozzle base are arranged in the heat shield (6).

8. Burner for gas hobs according to claim 7, characterized in that: The diameter of the inner side edge of the heat shield (6) is greater than the diameter of the outer edge of the mixing chamber (34), and the difference is 13-21mm, that is, the radial gap δ between the inner side edge of the heat shield (6) and the outer edge of the mixing chamber (34) is 6.5-10.5mm.

9. Burner for gas hobs according to claim 8, characterized in that: A liquid containing tray is arranged below the mixing chamber (34), and the liquid containing tray is used as the mounting base (1).

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