A burner tip and ignition device for easy ignition of combustion

Abstract

The utility model provides a kind of easily ignites and burns fire end and ignition device, fire end includes combustion chamber installed in the fire end cover, fuel spray head and ignition device are equipped in the fire end cover, the top of combustion chamber is equipped with outer flange, multiple first air holes are equipped on outer flange along circumference, first air hole axis is radially inclined and is arranged, first air hole axis top end is close to combustion chamber axis, and its axis bottom end is away from combustion chamber axis;Combustion chamber side wall is equipped with multiple groups of side air holes, multiple groups of side air holes are arranged along combustion chamber axis, multiple side air holes in each group of side air holes are arranged along the circumference of combustion chamber, side air hole axis is inclined and is arranged, the hole end position of side air hole located in the outer wall of combustion chamber is lower than its hole end position located in the inner wall of combustion chamber, and the center position of two hole ends of side air hole is not located in same vertical plane.The utility model has good air intake effect, and can make combustion more sufficient.The ignition device of the utility model is not easy to be affected by high temperature, and has long service life.

Description

Technical Field

[0001] This utility model relates to the field of stove technology, specifically to a stove head and ignition device that are easy to ignite and burn. Background Technology

[0002] The burner head is the core component of a gas stove, typically located in the center of the cooktop. It generally consists of an outer casing, a combustion chamber, an ignition device, and a fuel injector. The outer casing primarily supports the combustion chamber and other components, and connects to the fan and fuel. The fan draws air into the outer casing, which then enters the combustion chamber through an opening. Fuel is connected to the fuel injector and injected into the combustion chamber. The air and fuel mix within the combustion chamber, and the mixture is ignited by the ignition device to produce a flame, thus achieving the heating function.

[0003] To improve combustion efficiency, air inlets are typically installed on the outer wall of the burner chamber to increase the air intake and aid combustion. However, existing air inlets are usually positioned perpendicular to the top or side wall of the burner chamber, resulting in a stable and uniform airflow. Since the flame primarily burns in the central part of the chamber, the airflow from conventional burners is insufficient to meet the combustion requirements of low-quality, non-flammable fuels. This leads to incomplete combustion, small flames, and excessive smoke, making the burner less effective.

[0004] Furthermore, the existing ignition devices in burners typically penetrate from the bottom of the outer casing. The electrical connection of the ignition device is prone to interference with the bottom-intake fan connection pipe, hindering assembly and use. Additionally, existing ignition devices are generally L-shaped, with the main body vertically positioned and the ignition needle section horizontally. The ignition needle is placed inside the combustion chamber through a side opening, placing the needle and part of the ceramic body in the high-temperature zone of the combustion chamber, making them susceptible to high-temperature damage or carbon buildup, leading to ignition failure and affecting usability. Moreover, when maintenance or replacement of burner components is required, the ignition needle must be disconnected from the electrical wire before the combustion chamber and ignition needle can be simultaneously removed from the outer casing, increasing the complexity of the burner disassembly and assembly process. Utility Model Content

[0005] To address the problems in the background art, this utility model proposes a burner head that is easy to ignite and burn, including a combustion chamber installed inside the burner head cover. The burner head cover is provided with a fuel nozzle and an ignition device. The top of the combustion chamber is provided with an outer flange. Multiple first air holes are provided on the outer flange along the circumferential direction. The axis of the first air holes is radially inclined along the outer flange. The top of the axis of the first air holes is close to the axis of the combustion chamber, and the bottom of the axis of the first air holes is far away from the axis of the combustion chamber. The combustion chamber sidewall is provided with multiple sets of side air holes, which are arranged along the axial direction of the combustion chamber. Multiple side air holes in each set are arranged along the circumference of the combustion chamber. The axis of the side air holes is inclined. The end of the side air hole on the outer wall of the combustion chamber is lower than the end of the side air hole on the inner wall of the combustion chamber, and the center positions of the two ends of the side air hole are not located in the same vertical plane. Preferably, an ignition port is provided at the bottom of the combustion chamber. When the combustion chamber is installed inside the burner head cover, the fuel nozzle in the burner head cover corresponds to the ignition port, and there is a gap between the top of the fuel nozzle and the bottom wall of the combustion chamber.

[0006] Preferably, a first protrusion is provided on the bottom wall of the combustion chamber along the inner side wall of the combustion chamber, and a second protrusion is provided on the bottom wall of the combustion chamber along the periphery of the ignition port. There is a gap between the first protrusion and the second protrusion, and the top surface of the first protrusion is higher than the top surface of the second protrusion.

[0007] Preferably, the diameter of the first air hole is 2.7 mm, and the angle between the axis of the first air hole and the horizontal plane is 87°; There are three sets of side air holes, which are arranged from top to bottom as the first side air hole, the second side air hole, and the third side air hole. The diameter of the first side air hole is 2.6 mm, the angle between the axis of the first side air hole and the horizontal plane is 30°, and the horizontal center distance between the two ends of the first side air hole is 2 mm. The diameter of the second side air hole is 2.6 mm, the angle between the axis of the second side air hole and the horizontal plane is 33°, and the horizontal center distance between the two ends of the second side air hole is 3 mm. The diameter of the third side air hole is 2mm, the angle between the axis of the third side air hole and the horizontal plane is 28°, and the horizontal center distance between the two ends of the third side air hole is 5mm.

[0008] Preferably, the combustion chamber has a limiting platform at the top of its outer flange, and the limiting platform is located between the first air hole and the outer peripheral side of the outer flange; A first support ring is placed on the outer side of the limiting platform; or a second support ring is placed on the inner side of the limiting platform.

[0009] An ignition device includes a ceramic body and an ignition needle disposed on the ceramic body. The ceramic body is disposed on the side of the outer cover of the burner head. One end of the ceramic body with the tip of the ignition needle is located inside the outer cover of the burner head and extends toward the fuel nozzle. The tip of the ignition needle is close to the fuel nozzle.

[0010] Preferably, an ignition chamber is provided below the combustion chamber, and the bottom wall of the ignition chamber is provided with an ignition inlet and a clearance groove located on one side of the ignition inlet, wherein the ignition inlet corresponds to the position of the ignition port; When the combustion chamber is installed inside the furnace head cover, the top of the fuel nozzle is located in the ignition chamber through the ignition inlet, the ceramic body is located below the combustion chamber, the ignition needle is located on top of the ceramic body and is inclined towards the fuel nozzle, and the ignition needle is located in the ignition chamber through the clearance groove.

[0011] Preferably, the top of the ceramic body is provided with a mounting plate that matches the shape of the clearance groove, and the tip of the ignition needle extends from the mounting plate to the outside of the ceramic body.

[0012] Preferably, there are two ignition needles, one end of the ceramic body is located outside the outer cover of the burner head, and a portion of the end face of the ceramic body located outside the outer cover of the burner head protrudes; The ignition needle extends from the end of the ceramic body located outside the outer cover of the burner head. One ignition needle extends from the protruding part of the end face of the ceramic body, and the other ignition needle extends from the non-protruding part of the end face of the ceramic body. The length of the extended end of the ignition needle does not exceed the length of the protruding part of the ceramic body.

[0013] Preferably, the ceramic body has a first screw hole at its bottom, and the furnace head cover has a second screw hole at its bottom; When the ceramic body is installed inside the furnace head cover, the first screw hole and the second screw hole are in corresponding positions, and the ceramic body and the furnace head cover are connected by bolts, the first screw hole and the second screw hole.

[0014] The beneficial effects of this utility model are as follows: 1. The combustion chamber of this utility model is provided with multiple side air holes and a first air hole located at the top of the combustion chamber. The top of the first air hole is inclined towards the center of the combustion chamber, which can improve the air gathering effect and ensure that the air gathers at the flame combustion point, thereby improving the combustion effect. The side air holes are also inclined, with the end of the side air hole on the outer wall of the combustion chamber lower than the end of the side air hole on the inner wall of the combustion chamber, and the center positions of the two ends of the side air holes are not located in the same vertical plane. This allows the air entering the combustion chamber to form an upward swirling flow, enabling the air to be more fully distributed in the combustion chamber and improving the air-fuel mixing effect, thereby facilitating combustion.

[0015] This invention enables more complete combustion of fuel and improves combustion efficiency. Even when using low-quality fuel, it can improve the degree of complete combustion, so that the combustion efficiency is not affected by the quality and type of fuel.

[0016] 2. The ignition needle of this invention is located at the fuel nozzle, rather than entering the combustion chamber, thus avoiding problems such as carbon buildup and ignition failure caused by high temperatures. Furthermore, the ceramic body of the ignition device is located inside the burner head casing, and is also unaffected by the high temperatures of the flame, thereby extending the service life of the ignition device.

[0017] The ignition device of this utility model is installed from the side of the burner head cover. The ignition needle wire end will not interfere with the bottom air inlet pipe and fuel connector. The main body is set in a straight line. When the burner head needs to be disassembled, there is no need to separate the ignition needle from the wire first. The combustion chamber and ignition device also do not need to be disassembled at the same time, which reduces the complexity of burner head assembly.

[0018] The ignition device of this invention is easy to disassemble and assemble, and has a long service life. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model without the support ring; Figure 3 This is a schematic diagram of the combustion chamber structure of this utility model. Figure 1 ; Figure 4 This is a schematic diagram of the combustion chamber structure of this utility model. Figure 2 ; Figure 5 This is a side view of the combustion chamber structure of this utility model. Figure 6 This is a side sectional view of the overall structure of this utility model; Figure 7 This is a schematic diagram of the ignition device of this utility model; Figure 8 This is a schematic diagram of the first support ring structure of this utility model; Figure 9 This is a schematic diagram of the second support ring structure of this utility model.

[0020] The following are the labeling elements in the diagram: 1. Combustion chamber; 2. Furnace head cover; 3. Ceramic body; 4. Second support ring; 41. Second slot; 5. Ignition needle; 6. First air hole; 7. First side air hole; 8. Second side air hole; 9. Third side air hole; 10. Combustion chamber; 11. Outer flange; 12. Limiting platform; 13. Ignition inlet; 14. Circumvention groove; 15. Fuel nozzle; 16. First boss; 17. Second boss; 18. Ignition chamber; 19. Ignition port; 20. Locking platform; 21. Protrusion; 22. First support ring; 221. First slot; 23. Bolt. Detailed Implementation

[0021] To make this utility model clearer and more understandable, the technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the given embodiments are only one of the implementation methods and do not represent all embodiments.

[0022] In this article, terms such as "inner," "outer," "upper," "lower," "horizontal," and "vertical" are established based on the positional relationships shown in the attached drawings. Depending on the attached drawings, the corresponding positional relationships may also change. Therefore, they should not be interpreted as an absolute limitation on the scope of protection.

[0023] Combined with appendix Figure 1 - Appendix Figure 9 A burner head that is easy to ignite and burn includes a combustion chamber 1 installed inside a burner head cover 2. The burner head cover 2 is provided with a fuel nozzle 15 and an ignition device. The top of the combustion chamber 1 is provided with an outer flange 11. The outer flange 11 is provided with a plurality of first air holes 6 along the circumferential direction. The axis of the first air holes 6 is radially inclined along the outer flange 11, that is, the centers of the two ends of the first air holes 6 are located in the same vertical plane. The top of the axis of the first air holes 6 is close to the axis of the combustion chamber 1, and the bottom of the axis of the first air holes 6 is far away from the axis of the combustion chamber 1. The sidewall of the combustion chamber 1 is provided with multiple sets of side air holes, which are arranged along the axial direction of the combustion chamber 1. Multiple side air holes in each set are arranged around the circumference of the combustion chamber 1. The axis of the side air holes is inclined. The end of the side air hole on the outer wall of the combustion chamber 1 is lower than the end of the side air hole on the inner wall of the combustion chamber 1, and the center positions of the two ends of the side air hole are not located in the same vertical plane.

[0024] When the first air hole 6 is set, the drilling device is drilled from the bottom of the outer flange 11 and drills the hole radially upward along the outer flange 11 in a direction close to the axis of the combustion chamber 1; when the side air hole is set, the drilling device is drilled from the outer wall of the combustion chamber 1 and drills the hole inclined to the upper left or upper right in a direction close to the interior of the combustion chamber 1. Specifically, an ignition port 19 is provided at the bottom of the combustion chamber 1. When the combustion chamber 1 is installed inside the burner head cover 2, the fuel nozzle 15 in the burner head cover 2 corresponds to the ignition port 19, and there is a gap between the top of the fuel nozzle 15 and the bottom wall of the combustion chamber 1.

[0025] More specifically, a first protrusion 16 is provided on the bottom wall of the combustion chamber 1 along the inner side wall of the combustion chamber 1, and a second protrusion 17 is provided on the bottom wall of the combustion chamber 1 along the periphery of the ignition port 19. There is a gap between the first protrusion 16 and the second protrusion 17, and the top surface of the first protrusion 16 is higher than the top surface of the second protrusion 17.

[0026] The diameter of the first air hole 6 is 2.7 mm, and the angle between the axis of the first air hole 6 and the horizontal plane is 87°. There are three sets of side air holes, which are arranged from top to bottom as the first side air hole 7, the second side air hole 8 and the third side air hole 9. The diameter of the first side air hole 7 is 2.6 mm, the angle between the axis of the first side air hole 7 and the horizontal plane is 30°, and the horizontal center distance between the two ends of the first side air hole 7 is 2 mm. The diameter of the second side air hole 8 is 2.6 mm, the angle between the axis of the second side air hole 8 and the horizontal plane is 33°, and the horizontal center distance between the two ends of the second side air hole 8 is 3 mm. The diameter of the third side air hole 9 is 2mm, the angle between the axis of the third side air hole 9 and the horizontal plane is 28°, and the horizontal center distance between the two ends of the third side air hole 9 is 5mm.

[0027] The above dimensions are the preferred dimensions for achieving the desired air intake effect.

[0028] Specifically, the side air vents in two adjacent sets are arranged in a staggered manner. That is, a first side air vent 7 is located between two adjacent second side air vents 8, and a second side air vent 8 is located between two adjacent third side air vents 9. The staggered arrangement of the side air vents can further improve the degree of air intake.

[0029] Specifically, the outer flange 11 of the combustion chamber 1 is provided with a limiting platform 12 at the top, and the limiting platform 12 is located between the first air hole 6 and the outer peripheral side of the outer flange 11; A first support ring 22 is placed on the outer side of the limiting platform 12; or a second support ring 4 is placed on the inner side of the limiting platform 12. Different support rings are selected based on the size of the stove. When using a large-diameter stove, the first support ring 22 can be placed on top of the combustion chamber 1; when using a small-diameter stove, the first support ring 22 can be removed, and the second support ring 4 can be placed on top of the combustion chamber 1. The first support ring 22 and the second support ring 4 are easy and quick to remove and place, and can improve the flexibility of stove use.

[0030] More specifically, the first support ring 22 is annular, the inner diameter of the first support ring 22 is the same as the outer diameter of the limiting platform 12, and the outer diameter of the first support ring 22 is not greater than the outer diameter of the outer flange 11; or, as Figure 8 As shown, the bottom of the inner ring side of the first support ring 22 is provided with a first slot 221. When the first support ring 22 is placed on the top of the combustion chamber 1, the top wall and the outer wall of the limiting platform 12 are located in the first slot 221.

[0031] The second support ring 4 is annular, located between the limiting platform 12 and the first air hole 6, and its outer diameter is the same as the inner diameter of the limiting platform 12; or, as Figure 9 As shown, the second support ring 4 has a second slot 41 at the bottom of the outer ring side. When the second support ring 4 is placed on the top of the combustion chamber 1, the top wall and inner side wall of the limiting platform 12 are located in the second slot 41.

[0032] An ignition device includes a ceramic body 3 and an ignition needle 5 disposed on the ceramic body 3. The ceramic body 3 is located on the side of a burner head cover 2. One end of the ceramic body 3 with the tip of the ignition needle 5 is located inside the burner head cover 2 and extends towards a fuel nozzle 15. The tip of the ignition needle 5 is close to the fuel nozzle 15. Specifically, an opening is provided on the side of the burner head cover 2. During installation, the end of the ceramic body 3 with the tip of the ignition needle 5 is inserted through the opening into the burner head cover 2. A second screw hole is provided at the bottom of the burner head cover 2, and a first screw hole is provided on the ceramic body 3. When the ceramic body 3 is positioned at the desired location inside the burner head cover 2, the first screw hole and the second screw hole correspond to each other. The ceramic body 3 and the burner head cover 2 are connected by bolts, the first screw hole, and the second screw hole. That is, the ignition device is fixedly connected to the burner head cover 2 by screwing the bolts into the first screw hole and the second screw hole.

[0033] Specifically, an ignition chamber 18 is provided below the combustion chamber 1. The bottom wall of the ignition chamber 18 is provided with an ignition inlet 13 and a clearance groove 14 located on one side of the ignition inlet 13. The ignition inlet 13 corresponds to the position of the ignition port 19. When the combustion chamber 1 is installed inside the burner head cover 2, the top of the fuel nozzle 15 is located in the ignition chamber 18 through the ignition inlet 13. The ceramic body 3 is located below the combustion chamber 1, and the ignition needle 5 is located on top of the ceramic body 3 and tilted towards the fuel nozzle 15. The ignition needle 5 is located in the ignition chamber 18 through the clearance groove 14. Both the ignition needle 5 and the fuel nozzle 15 are located in the ignition chamber 18, not in the combustion chamber 10 (high-temperature zone). The ignition chamber 18 is a low-temperature zone, which can prevent the ignition needle 5 from overheating, resulting in carbon buildup, oil stains, etc., and thus avoid damage to the ignition needle 5 or failure to ignite. More specifically, the top of the ceramic body 3 is provided with a retaining plate 20 that matches the shape of the clearance groove 14, and the tip of the ignition needle 5 extends from the retaining plate 20 to the outside of the ceramic body 3. When installing the combustion chamber 1, first tilt the combustion chamber 1 slightly so that the tip of the ignition needle 5 enters the ignition chamber 18 through the clearance groove 14, then straighten the combustion chamber 1 so that the retaining plate 20 is inserted into the clearance groove 14. Setting the retaining plate 20 can improve the stability of the combustion chamber 1 installation and prevent rotation between the combustion chamber 1 and the ceramic body 3.

[0034] Specifically, there are two ignition needles 5, one end of the ceramic body 3 is located outside the furnace head cover 2, and a portion of the end face of the ceramic body 3 located outside the furnace head cover 2 has a protrusion 21. The ignition needle 5 extends from the end furthest from the needle tip (i.e., the end to which the external wire of the ignition needle 5 is connected) beyond the end of the ceramic body 3 located outside the burner head cover 2. One ignition needle 5 extends from the protruding portion 21 on the end face of the ceramic body 3, while the other ignition needle 5 extends from the portion of the end face of the ceramic body 3 that is not protruding 21. The length of the extended end of the other ignition needle 5 does not exceed the length of the protruding portion 21 of the ceramic body 3, thus achieving a staggered arrangement of the two ignition needles 5 to avoid ignition failure due to uneven contact. The length direction of the protrusion 21 is consistent with the length direction of the ceramic body 3.

[0035] Although embodiments of the present invention have been shown and described, those skilled in the art will be able to make various changes, modifications, substitutions and alterations to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stove head for easy ignition of combustion, comprising a combustion chamber (1) installed in a stove head cover (2), a fuel injection head (15) and an ignition device are arranged in the stove head cover (2), characterized in that: The combustion chamber (1) is provided with an outer flange (11) at the top. The outer flange (11) is provided with a plurality of first air holes (6) along the circumferential direction. The axis of the first air hole (6) is radially inclined along the outer flange (11). The top of the axis of the first air hole (6) is close to the axis of the combustion chamber (1), and the bottom of the axis of the first air hole (6) is far away from the axis of the combustion chamber (1). The sidewall of the combustion chamber (1) is provided with multiple sets of side air holes. The multiple sets of side air holes are arranged along the axial direction of the combustion chamber (1). Multiple side air holes in each set are arranged along the circumference of the combustion chamber (1). The axis of the side air holes is inclined. The position of the end of the side air hole on the outer wall of the combustion chamber (1) is lower than the position of the end of the side air hole on the inner wall of the combustion chamber (1). The center positions of the two ends of the side air hole are not located in the same vertical plane.

2. A fire pit for easy ignition of combustion as claimed in claim 1, wherein: The combustion chamber (1) has an ignition port (19) at the bottom. When the combustion chamber (1) is installed inside the furnace head cover (2), the fuel nozzle (15) in the furnace head cover (2) corresponds to the ignition port (19), and there is a gap between the top of the fuel nozzle (15) and the bottom wall of the combustion chamber (1).

3. A fire pit for easy ignition combustion as claimed in claim 2 wherein: The combustion chamber (1) has a first protrusion (16) on the bottom wall and a second protrusion (17) on the bottom wall and the periphery of the ignition port (19). There is a gap between the first protrusion (16) and the second protrusion (17), and the top surface of the first protrusion (16) is higher than the top surface of the second protrusion (17).

4. A burner head that is easy to ignite and burn according to claim 1 or 3, characterized in that: The diameter of the first air hole (6) is 2.7 mm, and the angle between the axis of the first air hole (6) and the horizontal plane is 87°. There are three sets of side air holes. The three sets of side air holes are, from top to bottom, the first side air hole (7), the second side air hole (8) and the third side air hole (9). The diameter of the first side air hole (7) is 2.6 mm. The angle between the axis of the first side air hole (7) and the horizontal plane is 30°. The horizontal center distance between the two ends of the first side air hole (7) is 2 mm. The diameter of the second side air hole (8) is 2.6 mm, the angle between the axis of the second side air hole (8) and the horizontal plane is 33°, and the horizontal center distance between the two ends of the second side air hole (8) is 3 mm; The diameter of the third side air hole (9) is 2mm, the angle between the axis of the third side air hole (9) and the horizontal plane is 28°, and the horizontal center distance between the two ends of the third side air hole (9) is 5mm.

5. The easily ignitable and combustible burner head according to claim 1, characterized in that: The combustion chamber (1) has a limiting platform (12) at the top of the outer flange (11), and the limiting platform (12) is located between the first air hole (6) and the outer peripheral side of the outer flange (11); A first support ring (22) is placed on the outside of the limiting platform (12); or a second support ring (4) is placed on the inside of the limiting platform (12).

6. An ignition device, applied to the burner head according to any one of claims 1-5, characterized in that: It includes a ceramic body (3) and an ignition needle (5) disposed on the ceramic body (3). The ceramic body (3) is disposed on the side of the furnace head cover (2). One end of the ceramic body (3) with the tip of the ignition needle (5) is located inside the furnace head cover (2) and extends toward the fuel nozzle (15). The tip of the ignition needle (5) is close to the fuel nozzle (15).

7. An ignition device according to claim 6, characterized in that: An ignition chamber (18) is provided below the combustion chamber (1). The bottom wall of the ignition chamber (18) is provided with an ignition inlet (13) and a clearance groove (14) located on one side of the ignition inlet (13). The ignition inlet (13) corresponds to the ignition port (19). When the combustion chamber (1) is installed inside the burner head cover (2), the top of the fuel nozzle (15) is located in the ignition chamber (18) through the ignition inlet (13), the ceramic body (3) is located below the combustion chamber (1), the ignition needle (5) is located on top of the ceramic body (3) and is inclined towards the fuel nozzle (15), and the ignition needle (5) is located in the ignition chamber (18) through the clearance groove (14).

8. An ignition device according to claim 7, characterized in that: The top of the ceramic body (3) is provided with a mounting plate (20) that matches the shape of the clearance groove (14), and the tip of the ignition needle (5) extends from the mounting plate (20) to the outside of the ceramic body (3).

9. An ignition device according to claim 6, characterized in that: There are two ignition needles (5), one end of the ceramic body (3) is located outside the furnace head cover (2), and a portion of the end face of the ceramic body (3) outside the furnace head cover (2) protrudes (21). The ignition needle (5) extends from the end of the ceramic body (3) outside the outer cover (2) of the burner head. One ignition needle (5) extends from the protruding (21) part of the end face of the ceramic body (3) away from the needle tip, and the other ignition needle (5) extends from the non-protruding (21) part of the end face of the ceramic body (3) away from the needle tip. The length of the extended end of the ignition needle (5) does not exceed the length of the protruding (21) part of the ceramic body (3).

10. An ignition device according to claim 6, characterized in that: The ceramic body (3) has a first screw hole at the bottom, and the furnace head cover (2) has a second screw hole at the bottom; When the ceramic body (3) is installed inside the furnace head cover (2), the first screw hole and the second screw hole are in the same position, and the ceramic body (3) and the furnace head cover (2) are connected by bolts, the first screw hole and the second screw hole.

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