Combustor and gas cooker comprising same
By setting a protruding limiting structure and an upper and lower connecting structure on the inner wall of the gas passage of the burner, the problem of inconspicuous radial visual misalignment when the positioning shaft is misplaced is solved, which improves the combustion performance and flame stabilization performance of the burner, and at the same time improves the backfire and knocking problem.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2026-03-27
AI Technical Summary
When the positioning shaft of the existing burner is misplaced, the radial visual misalignment is not obvious, which affects the combustion performance and causes excessive throttling of the gas passage.
A raised limiting structure and an upper and lower connecting structure are set on the inner wall of the gas passage. The upper end of the raised limiting structure is higher than the bottom end of the positioning shaft, and the opening width of the upper and lower connecting structure is smaller than the minimum width of the positioning shaft. Combined with the design of the positioning structure, the obvious radial misalignment between the burner cap and the base and the stability of the gas flow are achieved.
The design of the raised limiting structure and the upper and lower connecting structure enhances the flame stabilization performance of the burner, improves the backfire and knocking problem, and enhances the positioning accuracy and operational stability of the burner.
Smart Images
Figure CN224050373U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to gas equipment technical field, especially a burner and contain its gas stove. BACKGROUND
[0002] In prior art, the burner is inserted into the positioning structure on the base by positioning shaft to limit the fire cover and the base. However, the additional inner diameter reducing structure is not arranged on the inner diameter of the gas passage of the base in the prior structure, and when the positioning shaft is placed at other positions outside the positioning structure, the radial visual dislocation of the fire cover and the base is not obvious. If the inner diameter of the gas passage is simply reduced to enlarge the radial visual dislocation, the gas passage will be throttled too much to affect the combustion performance.
[0003] Therefore, how to arrange the additional inner diameter reducing structure on the gas passage without affecting the combustion performance of the burner becomes a difficult problem to be solved in the technical field. UTILITY MODEL CONTENTS
[0004] The utility model wants to solve the technical problem that the radial visual dislocation is not obvious when the positioning shaft of the burner is misplaced in prior art, and provides a burner and a gas stove containing the same.
[0005] The utility model solves the above technical problem by the following technical scheme:
[0006] A burner comprises a fire cover and a base, the fire cover is provided with a positioning shaft, the base is provided with a gas passage and a positioning structure matched with the positioning shaft, the inner wall of the gas passage has a plurality of convex limiting structures in the radial direction, the two sides of the convex limiting structure have an up-down communication structure, the opening width of the up-down communication structure is smaller than the minimum width of the positioning shaft, the shortest distance from the center of the base to the convex limiting structure is smaller than or equal to the shortest distance from the center of the base to the inner wall of the positioning structure, the upper end of the convex limiting structure is higher than the bottom end of the positioning shaft along the direction of inserting the positioning shaft into the base.
[0007] By setting the protruding limiting structure on the inner wall of the gas passage of the base, the shortest distance from the protruding limiting structure to the center of the base is less than or equal to the shortest distance from the center of the base to the inner wall of the positioning structure, and the upper end of the protruding limiting structure is higher than the bottom end of the positioning shaft. When the positioning shaft is inserted into the matching positioning structure on the base, if the positioning shaft is inserted incorrectly (i.e., not inserted into the positioning structure), the lower end of the positioning shaft will abut against the protruding limiting structure, causing the fire cover to be tilted relative to the base as a whole, or the positioning shaft will be inserted into the center of the base, causing the fire cover to be obviously misaligned with the base in the radial direction, so that the user can easily identify the incorrect positioning of the positioning shaft. Furthermore, by setting the upper and lower communication structures on both sides of the protruding limiting structure, the opening width of the upper and lower communication structures is less than the minimum width of the positioning shaft, so that the gas flows through the upper and lower communication structures, avoiding the obstruction of the gas flowing in the gas passage caused by the protruding limiting structure. At the same time, for the gas flow, the upper and lower communication structures have a certain flow slowing effect compared to a completely open space, which can improve the flame stability performance of the burner and enhance the backfire resistance when the fire is off, thereby improving the backfire and booming problem.
[0008] Preferably, the upper and lower communication structures extend to one side of the protruding limiting structure toward the center of the base.
[0009] By setting the upper and lower communication structures to extend to one side of the protruding limiting structure toward the center of the base to form a groove structure, the flame can be guided in the direction of the groove during combustion. The high-temperature flame generated by combustion has a tendency to spread to the surrounding space, but the presence of the groove structure limits the spreading direction of the flame, allowing it to move toward the gas passage in the center of the base, thereby improving the combustion performance of the burner.
[0010] Preferably, the positioning structure is an open fan-shaped hole, and the inner walls on both sides of the positioning structure form an angle that becomes wider from narrow in the direction from the center of the base to the positioning structure, so as to limit the freedom of the fire cover relative to the base in terms of circumferential rotation and radial inward movement, thereby achieving the positioning of the base on the fire cover.
[0011] By setting the inner walls on both sides of the positioning structure to form an angle that becomes wider from narrow in the outward extension direction from the center of the base, after the positioning shaft is inserted into the positioning structure, the inner walls on both sides of the positioning structure can not only achieve the original circumferential limiting effect, but also abut against the circumferential surface of the positioning shaft to prevent the positioning shaft from shaking in the direction from the positioning structure to the center of the base, thereby limiting the freedom of the fire cover relative to the base in terms of radial inward movement.
[0012] Preferably, the inner wall on one side of the positioning structure away from the center of the base is a rear inner wall, and the rear inner wall abuts against the positioning shaft to limit the freedom of the fire cover relative to the base in terms of radial outward movement.
[0013] The rear inner wall can abut against the positioning shaft when moving radially outward in the direction of the positioning shaft away from the center of the base, preventing the positioning shaft from moving radially outward. With the cooperation of the inner surfaces of the protrusions on both sides of the positioning structure and the rear inner wall, the positioning shaft can achieve both circumferential and radial positioning of the fire cover relative to the base after being inserted into the positioning structure.
[0014] Preferably, the bottom end of the positioning shaft is spherical, and the upper end surface of the positioning structure is curved.
[0015] The bottom end of the positioning shaft is spherical, and the upper end surface of the positioning structure is curved formed by the combination of an inclined surface and a circular surface. Since the sliding friction resistance of the spherical bottom end of the positioning shaft on the curved upper end surface of the positioning structure is extremely small, the positioning shaft can be automatically guided into the positioning structure when in use. At the same time, the positioning structure has a larger opening width at the upper end surface to improve the ease of positioning of the positioning shaft, and a smaller opening width at the lower end surface to improve the fitting accuracy of the positioning shaft and the positioning structure.
[0016] Preferably, the fire cover is further provided with a connecting column for connecting the fire cover and the positioning shaft, and the cross-sectional area of the connecting column is larger than that of the positioning shaft.
[0017] The connecting column is provided to connect and extend the positioning shaft, thereby increasing the depth of the positioning shaft inserted into the base to strengthen the movement restriction between the fire cover and the base. The manufacturing precision of the connecting column is much lower than that of the positioning shaft, which can effectively reduce the manufacturing cost. At the same time, the cross-sectional area of the connecting column is larger than that of the positioning shaft, and when the positioning shaft is inserted into the positioning structure, the upper end surfaces on both sides of the positioning structure will abut against the lower end surface of the connecting column, preventing the connecting column and the positioning shaft from continuing to descend.
[0018] Preferably, the inner wall of the up-and-down communication structure comprises a curved surface, and the side of the protrusion limiting structure towards the center of the base is a convex end, which is distributed on a circle.
[0019] By setting the inner wall of the up-and-down communication structure to comprise a curved surface, compared with a "V" type or straight line type structure, the gas outlet cross-sectional area can be more effectively increased, and the positioning shaft with a smaller width size can be more effectively limited. By setting the side of the protrusion limiting structure towards the center of the base to be distributed on a circle, the gas can form a more uniform annular flow distribution when passing through the through hole, so that the gas distribution in the combustion area is more uniform, thereby improving the uniformity and efficiency of combustion and reducing the occurrence of local overheating or insufficient combustion.
[0020] Preferably, the fire cover and the positioning shaft are integrally formed.
[0021] The fire cover and the positioning shaft are integrally formed, compared with the non-integrally formed, the fire cover and the positioning shaft will not appear matching error, so that the positional relationship of the fire cover and the positioning shaft can be kept in a stable state, and the positioning accuracy of the fire cover and the base can be further ensured after the positioning shaft is inserted into the base. And the integrally formed is better than the split structure in the prior art to withstand external force, thermal stress and the like in the use process, reduces the safety hidden danger caused by loosening, displacement or fracture, facilitates the user to disassemble and install operation, also improves the stability and reliability of the whole system, prolongs the service life.
[0022] Preferably, along the direction from the center of the base to the positioning structure, the base is provided with an annular groove and a thimble at the rear side of the positioning structure, the annular groove is communicated with the positioning structure, and the thimble abuts against the positioning shaft to prevent the positioning shaft from moving towards the annular groove.
[0023] And / or, the upper end of the protruding limiting structure is higher than the bottom end of the positioning shaft when the positioning shaft is inserted into the positioning structure, and the height difference between the upper end of the protruding limiting structure and the bottom end of the positioning shaft when the positioning shaft is inserted into the positioning structure is greater than or equal to 5mm.
[0024] After the positioning shaft is inserted into the positioning structure, the original side air inlet on the base is partially blocked, and the annular groove can make up for the loss of the gas release area. The annular groove is communicated with the positioning structure, so that the annular groove does not need to be separately manufactured, thereby reducing the processing procedure, and reducing the processing difficulty and cost. In order to prevent the positioning shaft from moving towards the annular groove, the thimble is arranged to abut against the positioning shaft.
[0025] The height difference between the upper end of the protruding limiting structure and the bottom end of the positioning shaft is greater than or equal to 5mm, when the positioning shaft is placed above the protruding limiting structure of the base, there is a large gap in the vertical direction, so as to improve the recognition degree of the user who puts the positioning shaft in the wrong place.
[0026] The utility model also provides a gas stove which comprises the burner as described above.
[0027] The positive progress effect of the utility model lies in: in the burner and the gas stove containing same, the protruding limiting structure is arranged, and the opening width of the upper and lower communication structure is smaller than the minimum width of the positioning shaft, so that the positioning shaft cannot be placed in the upper and lower communication structure, thereby reducing the distance between the base center and the positioning shaft when the positioning shaft is placed wrongly, and further the radial misplacement of the fire cover and the base when the positioning shaft is placed wrongly can be enlarged, so that the user can identify the situation of the positioning shaft being placed wrongly. Moreover, the upper and lower communication structure arranged at the joint of the protruding limiting structure can effectively increase the gas outlet sectional area, and realize the function of enlarging the visual effect of misplacement without affecting the gas release performance. Meanwhile, the upper and lower communication structure design has certain flow slowing effect, can improve the stable flame performance of the burner, and can enhance the backfire resistance when the fire is turned off, thereby improving the backfire and booming problem. BRIEF DESCRIPTION OF DRAWINGS
[0028] Figure 1 It is the correct assembly state schematic view of the burner of an embodiment of the utility model.
[0029] Figure 2 It is the error assembly state schematic view of the burner of an embodiment of the utility model.
[0030] Figure 3 It is the separation state schematic view of the burner of an embodiment of the utility model.
[0031] Figure 4 It is the three-dimensional schematic view of the fire cover of an embodiment of the utility model.
[0032] Figure 5 It is the three-dimensional schematic view of the base of an embodiment of the utility model.
[0033] Figure 6 It is the top view of the base of an embodiment of the utility model.
[0034] Figure 7 It is the bottom view of the base of an embodiment of the utility model.
[0035] BRIEF DESCRIPTION OF DRAWINGS
[0036] Burner 1
[0037] Fire cover 10
[0038] Positioning shaft 20
[0039] Bottom end 21
[0040] Connecting column 30
[0041] Base 40
[0042] Center 41
[0043] Gas passage 42
[0044] Positioning structure 43
[0045] Upper end surface 430
[0046] Lower end surface 431
[0047] Inner wall 432, two side inner walls 4321, rear inner wall 4322
[0048] Ejector pin 44
[0049] Annular groove 45
[0050] Protruding limiting structure 46
[0051] Protruding end 460
[0052] Circle 461
[0053] Up-and-down communication structure 47 DETAILED DESCRIPTION
[0054] The utility model will be described below in conjunction with the drawings.
[0055] As Figures 1-5 shown, the embodiment provides a burner 1, which comprises a fire cap 10 and a base 40, the fire cap 10 is provided with a positioning shaft 20, the base 40 is provided with a gas passage 42 and a positioning structure 43 matched with the positioning shaft 20, the inner wall of the gas passage 42 has ten protruding limiting structures 46 in the radial direction, the two sides of the protruding limiting structure 46 are provided with up-and-down communication structures 47, and the up-and-down communication structure 47 is connected with the gas passage 42. Figure 1 It can be seen that the up-and-down communication structure 47 in the embodiment extends to one side of the protruding limiting structure 46 towards the center 41 of the base 40, and specifically, the up-and-down communication structure 47 is provided as a "U"-shaped groove structure to increase the gas passing area.In other embodiments, the up-and-down communication structure 47 can also be provided as a hole structure or other through structure, which can also achieve the effect of increasing the gas passing area. The burner 1 is provided with ten "U"-shaped groove structures in total, and a single "U"-shaped groove structure is distributed on one side of the up-and-down communication structure 47. The opening width of the up-and-down communication structure 47 is less than the minimum width of the positioning shaft 20, the shortest distance from the center 41 of the base 40 to the protruding limiting structure 46 is less than or equal to the shortest distance from the center 41 of the base 40 to the inner wall 432 of the positioning structure 43, in the direction of inserting the positioning shaft 20 into the base 40, the upper end of the protruding limiting structure 46 is higher than the bottom end 21 of the positioning shaft 20.
[0056] The shortest distance from the protruding limiting structure 46 to the center 41 of the base 40 is less than or equal to the shortest distance from the center 41 of the base 40 to the inner wall 432 of the positioning structure 43, and the upper end of the protruding limiting structure 46 is higher than the bottom end of the positioning shaft 20. When the positioning shaft 20 is inserted into the matching positioning structure 43 on the base 40, if the positioning shaft 20 is inserted incorrectly (i.e., not inserted into the positioning structure 43), the lower end of the positioning shaft 20 will abut against the protruding limiting structure 46 (not shown in the figure), causing the fire cover 10 to be tilted relative to the base 40 as a whole, or the positioning shaft 20 will be inserted into the center of the base 40 (as shown in Figure 2 The opening width of the up-and-down communication structure 47 is less than the minimum width of the positioning shaft 20, so that the gas flows through the up-and-down communication structure 47, avoiding the obstruction of the gas flowing in the gas passage 42 caused by the protruding limiting structure 46. The up-and-down communication structure 47, whether it is a slot structure or a hole structure or other through structure, does not affect its function of increasing the gas passing area. At the same time, for gas flow, the up-and-down communication structure 47 on both sides of the protruding limiting structure 46 has a certain flow slowing effect compared to a completely open space, which can improve the flame stability performance of the burner 1 and enhance the backfire resistance when the fire is off, thereby improving the backfire booming problem.
[0057] As shown in Figures 5-7 In the burner 1 of the present embodiment, the up-and-down communication structure 47 extends to one side of the protruding limiting structure 46 facing the center 41 of the base 40. In this arrangement, the up-and-down communication structure 47 extends to the protruding limiting structure 46 to form a slot structure, which facilitates the guidance of the flame in the direction of the slot during combustion. The high-temperature flame generated by combustion has a tendency to spread to the surrounding space, but the presence of the slot structure restricts the spreading direction of the flame, enabling it to move towards the gas passage 42 in the center of the base 40, thereby improving the combustion performance of the burner 1.
[0058] As shown in Figures 5-7 The positioning structure 43 is an open fan-shaped hole, and the angle between the two inner walls 4321 of the positioning structure 43 changes from narrow to wide in the direction from the center 41 of the base 40 to the positioning structure 43, so as to limit the freedom of the fire cover 10 to rotate circumferentially and move radially inward relative to the base 40, thereby achieving the positioning of the base 40 on the fire cover 10.
[0059] By setting the two side inner walls 4321 of the positioning structure 43 as a narrow-to-wide included angle in the outward extension direction of the center of the base 40, after the positioning shaft 20 is inserted into the positioning structure 43, not only the original circumferential limiting effect can be achieved, but also the two side inner walls 4321 of the positioning structure 43 can abut against the peripheral surface of the positioning shaft 20, preventing the positioning shaft 20 from shaking in the direction of the center 41 of the base 40 along the positioning structure 43, thereby achieving the limitation of the freedom degree of the radial inward movement of the fire cover 10 relative to the base 40.
[0060] In combination with Figure 1 , Figure 6 and Figure 7 , the side inner wall 432 of the positioning structure 43 away from the center 41 of the base 40 is the rear inner wall 4322. In the present embodiment, the thimble 44 arranged above the rear inner wall 4322 abuts against the positioning shaft 20, so as to limit the freedom degree of the radial outward movement of the fire cover 10 relative to the base 40. In other embodiments, the rear inner wall 4322 can directly abut against the positioning shaft 20, so as to limit the radial outward movement of the fire cover 10 relative to the base 40. In other embodiments, the thimble 44 can also be arranged at other positions on the rear side of the positioning structure 43, so as to abut against the positioning shaft 20. The thimble 44 arranged at the rear inner wall 4322 of the positioning structure 43 or other positions on the rear side of the positioning structure 43 has no effect on its abutment against the positioning shaft 20.
[0061] The rear inner wall 4322 or the thimble 44 arranged above the rear inner wall 4322 can abut against the positioning shaft 20 when the positioning shaft 20 moves radially outward away from the center of the base 40, preventing the positioning shaft 20 from moving radially outward. Under the cooperation of the two side convex inner surfaces of the positioning structure 43 and the rear inner wall 4322, after the positioning shaft 20 is inserted into the positioning structure 43, the circumferential limiting and radial limiting effects of the fire cover 10 relative to the base 40 can be achieved at the same time.
[0062] As shown in Figures 4-7 , the bottom end 21 of the positioning shaft 20 is a spherical surface, and the upper end surface 430 of the positioning structure 43 is a curved surface. Specifically, the upper end surface 430 of the positioning structure 43 in the present embodiment is set as a combination of an inclined surface and a circular arc surface. The width of the upper end surface 430 of the positioning structure 43 is greater than the width of the lower end surface 431 of the positioning structure 43.
[0063] The bottom end 21 of the positioning shaft 20 is provided as a spherical surface, and the upper end surface 430 of the positioning structure 43 is a curved surface formed by combining a bevel surface and a circular arc surface. Because the sliding friction resistance of the spherical surface of the bottom end of the positioning shaft 20 on the curved surface of the upper end of the positioning structure 43 is extremely small, the positioning shaft 20 can be automatically guided into the positioning structure 43 when used by the user. At the same time, the upper end surface 430 of the positioning structure 43 is provided with a wide opening, thereby improving the ease of positioning of the positioning shaft 20, and the lower end surface 431 of the positioning structure 43 is provided with a narrow opening, thereby improving the fitting accuracy of the positioning shaft 20 and the positioning structure 43.
[0064] As shown in Figure 4 , the fire cap 10 is further provided with a connecting column 30, which is used to connect the fire cap 10 and the positioning shaft 20, and the cross-sectional area of the connecting column 30 is larger than that of the positioning shaft 20.
[0065] By connecting and extending the positioning shaft 20 through the connecting column 30, the depth of the positioning shaft 20 inserted into the base 40 is increased to strengthen the movement restriction between the fire cap 10 and the base 40, and the manufacturing accuracy of the connecting column 30 is much lower than that of the positioning shaft 20, which can effectively reduce the manufacturing cost. At the same time, the cross-sectional area of the connecting column 30 is larger than that of the positioning shaft 20, and when the positioning shaft 20 is inserted into the positioning structure 43, the upper end surface 430 on both sides of the positioning structure 43 will abut against the lower end of the connecting column 30, preventing the connecting column 30 and the positioning shaft 20 from continuing to descend.
[0066] In combination with Figure 1 , Figure 6 and Figure 7 , the inner wall of the up-and-down communication structure 47 includes a curved surface. In this embodiment, the up-and-down communication structure 47 is provided as a “U”-shaped slot, and the convex protruding end 460 of the convex limiting structure 46 on the side close to the center 41 of the base 40 is distributed on a circular arc 461. In other embodiments, the inner wall of the up-and-down communication structure 47 can be provided as other non-slotted structures including a curved surface.
[0067] By providing the inner wall of the up-and-down communication structure 47 with a curved surface, compared with a “V”-shaped or straight-line-shaped slot, the gas outlet cross-sectional area can be more effectively increased, and the positioning shaft 20 with a smaller width size can be limited. By distributing the convex protruding end 460 of the convex limiting structure 46 on a circular arc 461, a more uniform annular gas flow distribution can be formed when the gas passes through the gas passage 42, so that the gas distribution in the combustion area is more uniform, thereby improving the uniformity and efficiency of combustion and reducing the occurrence of local overheating or insufficient combustion.
[0068] In combination with Figure 1 , Figure 2 and Figure 3 , the fire cap 10 and the positioning shaft 20 are integrally formed in this embodiment of the burner 1.
[0069] The fire cover 10 and the positioning shaft 20 are integrally formed, and compared with a non-integrally formed structure, the integrally formed structure can prevent the fire cover 10 and the positioning shaft 20 from being misaligned, so that the positional relationship between the fire cover 10 and the positioning shaft 20 can be kept stable, and the positioning accuracy of the fire cover 10 and the base 40 can be further ensured after the positioning shaft 20 is inserted into the base 40. In addition, compared with the split structure in the prior art, the integrally formed structure can better withstand external forces and thermal stress during use, reduces the safety hazards caused by loosening, displacement or breakage, facilitates the disassembly and assembly operation of the user, improves the stability and reliability of the entire system, and prolongs the service life.
[0070] In combination with Figure 1 , Figure 6 and Figure 7 , the burner 1 in the embodiment is provided with an annular groove 45 (as shown by the hatched dashed line portion in Figure 6 and Figure 7 ) and a top pin 44 on the rear side of the positioning structure 43 along the direction from the center 41 of the base 40 to the positioning structure 43, the annular groove 45 is in communication with the positioning structure 43, and the top pin 44 abuts against the positioning shaft 20 to prevent the positioning shaft 20 from moving towards the annular groove 45.
[0071] After the positioning shaft 20 is inserted into the positioning structure 43, the original side air inlet on the base 40 is partially blocked, and the annular groove 45 can compensate for the loss of the gas release area caused by the partial blocking. The annular groove 45 is designed to be in communication with the positioning structure 43, so that the annular groove 45 does not need to be separately manufactured by opening, thereby reducing the processing procedures and lowering the processing difficulty and cost. In addition, in order to prevent the positioning shaft 20 from moving towards the annular groove 45, the base 40 in the embodiment is further provided with the top pin 44 abutting against the positioning shaft 20.
[0072] In the embodiment, the upper end of the protruding limiting structure 46 is higher than the bottom end 21 of the positioning shaft 20 when the positioning shaft 20 is inserted into the positioning structure 43, and the height difference between the upper end of the protruding limiting structure 46 and the bottom end 21 of the positioning shaft 20 is 6 mm. When the positioning shaft 20 is placed above the protruding limiting structure 46 of the base 40, there is a large gap in the vertical direction, so that the recognition degree of the user when the positioning shaft 20 is placed incorrectly is improved. In other embodiments, the difference can also be set to other interval values greater than or equal to 5 mm, so as to improve the recognition degree of the user when the positioning shaft 20 is placed incorrectly by enlarging the gap.
[0073] The utility model further provides a kind of gas stove (not shown in the drawing), including the burner 1 as described above, by using the burner 1, the radial misalignment of fire cover 10 and base 40 when positioning shaft 20 is placed incorrectly can be further amplified, and the situation when positioning shaft 20 is placed incorrectly is facilitated to be identified by user.
[0074] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, but these changes and modifications all fall within the protection scope of the present application.
Claims
1. A burner comprising a fire cap and a base, the fire cap being provided with a positioning shaft, the base being provided with a gas passage and a positioning structure matching the positioning shaft, characterized in that, The inner wall of the gas passage has a plurality of protruding limiting structures in the radial direction, both sides of the protruding limiting structures have up-and-down communication structures, the opening width of the up-and-down communication structures is smaller than the minimum width of the positioning shaft, the shortest distance from the center of the base to the protruding limiting structure is smaller than or equal to the shortest distance from the center of the base to the inner wall of the positioning structure in the direction of inserting the base along the positioning shaft, and the upper end of the protruding limiting structure is higher than the bottom end of the positioning shaft.
2. The burner of claim 1, wherein The up-and-down communication structure extends to one side of the protruding limiting structure towards the center of the base.
3. The burner of claim 1, wherein The positioning structure is an open fan-shaped hole, and the included angle between the inner walls of both sides of the positioning structure in the direction from the center of the base to the positioning structure changes from narrow to wide, so as to limit the circumferential rotation and radial inward movement of the fire cover relative to the base.
4. The burner of claim 2, wherein The inner wall of one side of the positioning structure away from the center of the base is a rear inner wall, and the rear inner wall abuts against the positioning shaft to limit the radial outward movement of the fire cover relative to the base.
5. The burner of claim 1, wherein The bottom end of the positioning shaft is a spherical surface, the upper end surface of the positioning structure is a curved surface, and the width of the upper end surface of the positioning structure is greater than the width of the lower end surface of the positioning structure.
6. The burner of claim 1, wherein The fire cover is further provided with a connecting column for connecting the fire cover and the positioning shaft, and the cross-sectional area of the connecting column is greater than that of the positioning shaft.
7. The burner of claim 1, wherein The inner wall of the up-and-down communication structure comprises a curved surface, one side of the protruding limiting structure towards the center of the base is a convex end, and the convex end is distributed on a circle.
8. Burner according to any one of claims 1-7, characterized in that The fire cover and the positioning shaft are integrally formed.
9. Burner according to any one of claims 1-7, characterized in that In the direction from the center of the base to the positioning structure, the base is provided with an annular groove and a thimble on the rear side of the positioning structure, the annular groove communicates with the positioning structure, the thimble abuts against the positioning shaft to avoid movement of the positioning shaft in the direction of the annular groove; And / or, the upper end of the protruding limiting structure is higher than the bottom end of the positioning shaft when the positioning shaft is inserted into the positioning structure, and the height difference between the upper end of the protruding limiting structure and the bottom end of the positioning shaft when the positioning shaft is inserted into the positioning structure is greater than or equal to 5 mm.
10. A gas hob, characterized in that It comprises the burner as claimed in any one of claims 1-9.