Metal strip and honeycomb heating body thereof

Abstract

The utility model discloses a metal belt material and a honeycomb heating body thereof, the metal belt material comprises: a characteristic belt, which is provided with a plurality of wave crest parts and wave trough parts arranged alternately, fire holes are formed between adjacent wave crest parts, and fire holes are formed between adjacent wave trough parts; the lower end of the characteristic belt is connected with the vertically-arranged separation belt, the separation belt transversely penetrates through each wave crest part, each wave trough part and each fire hole, and the lower end of each fire hole is divided into at least two small holes by the separation belt. The metal belt material is simple in structure, high in porosity and capable of reducing the tempering probability and improving the heat intensity of area fire holes.

Description

Technical Field

[0001] The utility model relates to the technical field of burners, in particular to a metal strip material and a honeycomb heating element thereof. Background Art

[0002] The size of infrared burners on the market is much larger than that of atmospheric burners, but the heat load of infrared gas stoves is generally lower than that of atmospheric stoves. Within a certain range, a higher heat load can better meet the requirements of stir-frying. The honeycomb heating element of existing infrared burners is usually made of single or multiple layers of metal strips stacked, wound or wrapped, which has the risk of flashback during ignition and combustion.

[0003] In order to solve the problem of flashback, Chinese invention patent ZL200710028113.2 discloses a honeycomb heating element with infrared radiation function used in a gas burner, which prevents flashback by adding a mesh or fiber body at the bottom of the surface honeycomb heating layer. However, the pores of the mesh or fiber body are too small, and the resistance is too large when the gas passes through the lower side of the honeycomb heating element, which limits the improvement of the area fire hole heat intensity of the honeycomb heating element. At this time, in order to increase the heat load of the infrared gas stove, a larger size of honeycomb heating element is needed, which increases the cost and limits the promotion of infrared gas stoves. Summary of the invention

[0004] The utility model aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the utility model proposes a metal strip material with a simple structure and high porosity, which can reduce the probability of tempering and improve the area fire hole thermal strength. The utility model also provides a honeycomb heating element.

[0005] According to the metal strip provided above, it is achieved through the following technical solution:

[0006] A metal strip comprises: a characteristic strip having a plurality of alternately arranged crests and troughs, with fire holes formed between adjacent crests and between adjacent troughs; and a separation strip, a vertically arranged separation strip connected to the lower end of the characteristic strip, the separation strip laterally penetrating each crest, each trough and each fire hole, respectively, and the lower end of each fire hole is divided into at least two small holes by the separation strip.

[0007] In some embodiments, the dividing strip includes a first dividing member, and a vertically arranged first slot is opened at the lower end at the junction of the crest portion and the trough portion. The first dividing member is transversely penetrated through the first slot and the fire hole, respectively, and the lower end of each fire hole is divided into at least two small holes by the first dividing member.

[0008] In some embodiments, the dividing strip includes a second dividing member, a second vertically arranged slot is opened at the lower end of the front side of each of the crest portions, the second dividing member is transversely penetrated through the second slot and the fire hole, and the lower end of each of the fire holes is divided into at least two small holes by the second dividing member; and / or the dividing strip includes a third dividing member, a third vertically arranged slot is opened at the lower end of the rear side of each of the trough portions, the third dividing member is transversely penetrated through the third slot and the fire hole, and the lower end of each of the fire holes is divided into at least two small holes by the third dividing member.

[0009] In some embodiments, the dividing strip includes a fourth dividing member, a vertically arranged front card slot is opened at the lower end of the left side wall of each of the crest portions, and a vertically arranged rear card slot is opened at the lower end of the left side wall of each of the trough portions, the fourth dividing member is horizontally penetrated through the front card slot, the rear card slot and the fire hole and is connected to the characteristic strip, and the lower end of each of the fire holes is divided into at least two small holes by the fourth dividing member.

[0010] In some embodiments, a partition located inside the fire hole is provided at a position of the dividing zone corresponding to the fire hole, and the partition divides the fire hole into at least three small holes.

[0011] In some embodiments, a baffle plate that cooperates with the dividing strip and is engaged with the dividing strip is provided in each of the fire holes, and the baffle plate divides the small hole into two micro holes.

[0012] In some embodiments, a plurality of rows of first slit groups are provided on the characteristic band, which are located above the dividing band and spaced apart from each other vertically, and each row of the first slit groups includes a plurality of first slits spaced apart from each other along the length direction of the characteristic band, each of the first slits is arranged transversely, and the first slits adjacent to each other vertically are arranged in an alternating manner.

[0013] In some embodiments, the adjacently arranged crest portions and the trough portions share a pair of sub-features, and each of the first slits at least laterally penetrates through a pair of the features.

[0014] In some embodiments, the characteristic band includes a plurality of alternately arranged flat sections and corrugated sections, and the corrugated section has a plurality of alternately arranged crest portions and trough portions.

[0015] In some embodiments, a plurality of rows of second slit groups are arranged at intervals in the upper and lower directions on the planar segment, each row of the second slit groups includes a plurality of second slits arranged at intervals along the length direction of the planar segment, each second slit is arranged transversely, and the second slits adjacent to each other in the upper and lower directions are arranged in an alternating manner.

[0016] In some embodiments, a wide flat band is further included, wherein the wide flat band connected to each of the crests is disposed in front of the characteristic band, or the wide flat band connected to each of the troughs is disposed on the back of the characteristic band.

[0017] In some embodiments, a plurality of rows of second slit groups are arranged at intervals in the upper and lower directions on the wide flat belt, each row of the second slit groups includes a plurality of second slits arranged at intervals along the length direction of the wide flat belt, each second slit is arranged transversely, and the second slits adjacent to each other in the upper and lower directions are arranged in an alternating manner.

[0018] According to a honeycomb heating element provided above, it is realized by the following technical scheme: a honeycomb heating element, which includes a honeycomb body, and the honeycomb body is formed by winding a metal strip as described above, and pores for gas to pass through are formed between adjacent winding circles, and the porosity of the upper end of the pore is greater than the porosity of the lower end of the pore.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] The metal strip material of the utility model adds a separation strip at the lower end of the characteristic strip, and the separation strip separates the lower end of each fire hole on the characteristic strip into at least two small holes. The structure is simple and the porosity is high. The probability of flashback can be reduced, and the thermal intensity of the fire hole can be improved, which is beneficial to the full combustion of the gas under high load conditions, so that the honeycomb heating element heats up faster and the heat exchange is more complete. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an exploded view of the first metal strip in Example 1 of the utility model;

[0022] Figure 2 It is a schematic structural diagram of the first metal strip in Embodiment 1 of the present utility model;

[0023] Figure 3 It is a bottom view of the first metal strip in Example 1 of the utility model;

[0024] Figure 4 It is a schematic diagram of the honeycomb winding process in Example 1 of the utility model;

[0025] Figure 5 It is a schematic diagram of the structure of the honeycomb body in Example 1 of the utility model;

[0026] Figure 6 It is a partial bottom view of the second metal strip in Example 1 of the utility model;

[0027] Figure 7 It is a partial bottom view of the third metal strip in Example 1 of the utility model;

[0028] Figure 8 It is a partial bottom view of the fourth metal strip in Example 1 of the utility model;

[0029] Fig. 9 It is a partial bottom view of the fifth metal strip in Example 1 of the utility model;

[0030] Fig.10 It is a partial bottom view of the sixth metal strip in Example 1 of the utility model;

[0031] Fig.11 It is a schematic diagram of the structure of the metal strip in Example 2 of the utility model;

[0032] Fig.12 It is a schematic structural diagram of another metal strip in Example 2 of the utility model;

[0033] Fig.13 It is a schematic diagram of the structure of the metal strip in Example 3 of the utility model;

[0034] Fig.14 It is a bottom view of the metal strip in Example 3 of the utility model;

[0035] Fig.15 It is a schematic diagram of the honeycomb winding process in Example 3 of the present utility model;

[0036] Fig.16 It is a schematic diagram of the structure of the honeycomb body in Example 3 of the utility model;

[0037] Fig.17 It is an exploded view of another metal strip in Example 3 of the utility model;

[0038] Fig.18 It is a schematic structural diagram of another metal strip in Example 3 of the utility model.

[0039] In the figure: 1-characteristic band, 101-plane section, 102-corrugated section, 11-peak portion, 111-front slot, 12-trough portion, 121-rear slot, 13-fire hole, 131-small hole, 132-micropore, 141-first slot, 142-second slot, 143-third slot, 15-first gap; 2-dividing band, 201-dividing portion, 21-first separator, 22-second separator, 23-third separator, 24-fourth separator, 25-baffle; 3-wide flat band, 31-second gap; 4-honeycomb body. DETAILED DESCRIPTION

[0040] The following examples illustrate the present invention, but the present invention is not limited by these examples. Modifications to the specific implementation of the present invention or equivalent replacement of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed for protection in the present invention.

[0041] Example 1

[0042] This embodiment provides a honeycomb heating element, including a honeycomb body 4, which is formed by winding a metal strip. Of course, the honeycomb heating element may also include an inner fixing ring and / or an outer fixing ring, wherein the inner fixing ring is disposed in the central through hole of the honeycomb body 4 and connected to the radial inner side of the honeycomb body 4, and the outer fixing ring is sleeved outside the honeycomb body 4 and connected to the radial outer side of the honeycomb body 4.

[0043] The metal strip material includes a vertically arranged characteristic strip 1 and a vertically arranged dividing strip 2, wherein the characteristic strip 1 is preferably a corrugated strip, and of course can also be a semi-hexagonal corrugated strip, a rectangular strip or various serrated strips, and the characteristic strip 1 has a plurality of wave crests 11 and wave troughs 12 arranged alternately and facing opposite directions, and fire holes 13 facing forward and opening up and down are formed between adjacent wave crests 11, and fire holes 13 facing backward and opening up and down are formed between adjacent wave troughs 12. The dividing strip 2 is connected to the lower end of the characteristic strip 1, and the dividing strip 2 respectively passes through each wave crest 11, each wave trough 12 and each fire hole 13 in a transverse direction, and the lower end of each fire hole 13 is divided into at least two small holes 131 by the dividing strip 2, so that the porosity of the upper end of each fire hole 13 in the metal strip material is higher than the porosity of the lower end thereof.

[0044] When the dividing strip 2 is connected to the lower end of the characteristic strip 1, the characteristic strip 1 and the dividing strip 2 are coiled together to form a honeycomb body 4, and pores for gas to pass through are formed between adjacent coils. Since the dividing strip 2 that divides the fire hole 13 into at least two small holes 131 is connected to the lower end of the characteristic strip 1, on the one hand, the porosity of the upper end of the pore is greater than the porosity of the lower end of the pore. Compared with the honeycomb heating element disclosed in ZL200710028113.2, while ensuring the anti-flashback performance, the overall porosity of the honeycomb body is higher, which is more conducive to the injection of air (compared with the solution of adding a mesh body, a fiber body or a metal wire mesh at the bottom of the honeycomb body), which is conducive to the full combustion of gas under high load conditions, so that the honeycomb body heats up faster and the heat exchange is more sufficient; secondly, the dividing strip 2 prevents the trough 12 on each coil and the peak 11 of the adjacent coil from being recessed with each other to a certain extent, so that more stable pores can be formed between the coils.

[0045] Furthermore, the bottom of the dividing zone 2 is higher, lower or flush with the bottom of the characteristic zone 1. In the present embodiment, the bottom of the dividing zone 2 is flush with the bottom of the characteristic zone 1. This improves the overall aesthetics of the honeycomb body. Secondly, all the small holes 131 are located at the lower end of the metal strip or the honeycomb body. Compared with the solution of adding a mesh body, a fiber body or a metal wire mesh at the bottom of the honeycomb body, there is no need to add a mesh body, a fiber body or a metal wire mesh at the bottom of the honeycomb body 4, and the anti-flashback function can be achieved. At the same time, the porosity of the lower end of the honeycomb body is ensured to be high, the resistance of the gas passing through the pores is small, the burner injection performance is good, and the gas burns fully, so that the heat load of the honeycomb body of the same area can be larger (the area fire hole has a high thermal intensity).

[0046] The specific structure of the metal strip includes but is not limited to any of the following:

[0047] refer to Figure 1-5 The first type is that the metal strip includes a characteristic strip 1 and a separation strip 2. A vertically arranged first slot 141 is provided at the lower end of the junction between each crest portion 11 and trough portion 12 of the characteristic strip 1. The first slot 141 is connected to the adjacent fire hole 13. In this embodiment, the lower end of the first slot 141 passes through the bottom surface of the characteristic strip 1, so that the bottom of the first slot 141 is open to form a bottom opening, thereby facilitating the separation strip 2 to be embedded in the first slot 141 from bottom to top. The separation strip 2 includes a first separator 21, which is preferably a small flat strip or a narrow flat strip. During installation, the small flat belt or narrow flat belt is embedded in each first slot 141 of the characteristic belt 1 from bottom to top and is welded to the characteristic belt 1. At this time, the first partition 21 is transversely arranged in each first slot 141 of the characteristic belt 1 and each fire hole 13, and the lower end of each fire hole 13 is divided into two small holes 131 arranged at intervals in front and back by the first partition 21. The unit ventilation volume of the small hole 131 is lower than that of the fire hole 13, and the anti-flashback performance is better. It is particularly noted that in other embodiments, the bottom of the first slot 141 can also be designed to be closed. At this time, the partition belt 2 can be transversely passed through the first slot 141 from left to right.

[0048] When the small flat belt or narrow flat belt is inserted into each first slot 141 of the characteristic belt 1 from bottom to top and connected with the characteristic belt 1 by welding, the characteristic belt 1 and the small flat belt or narrow flat belt are wound together to form a honeycomb body 4, see Figure 4-5 Pores for gas to pass through are formed between adjacent coils, and the porosity of the upper end of the pores is greater than the porosity of the lower end of the pores.

[0049] refer to Figure 6, the second type, which is different from the first type of metal strip material in that the dividing strip 2 also includes a second separator 22 and a third separator 23. A vertically arranged second card slot 142 is provided at the lower end of the front side of each wave crest portion 11 of the characteristic strip 1, and the second card slot 142 is connected to the adjacent fire hole 13. The bottom of the second card slot 142 is open to form a bottom opening. The second separator 22 is preferably a small flat strip or a narrow flat strip, which is transversely penetrated in the second card slot 142 and the fire hole 13 respectively and is welded to the characteristic strip 1. A vertically arranged third card slot 143 is provided at the lower end of the rear side of each wave trough portion 12 of the characteristic strip 1, and the third separator 23 is preferably a small flat strip or a narrow flat strip, which is transversely penetrated in the third card slot 143 and the fire hole 13 respectively and is welded to the characteristic strip 1. It can be seen that by arranging three small flat bands or narrow flat bands spaced apart in the front-to-back direction at the lower end of the characteristic band 1, each small flat band or narrow flat band respectively transversely penetrates each wave crest portion 11, each wave trough portion 12 and each fire hole 13, so as to separate the lower end of each fire hole 13 into four small holes 131. It is particularly noted that in other embodiments, the second partition 22 or the third partition 23 may be omitted.

[0050] refer to Figure 7 , the third type, which is different from the second type of metal strip material in that the first separator 21 is omitted, and the separator strip 2 only includes the second separator 22 and the third separator 23. When two small flat strips or narrow flat strips are arranged at intervals along the front-to-back direction at the lower end of the characteristic strip 1, each small flat strip or narrow flat strip respectively passes through each crest portion 11, each trough portion 12 and each fire hole 13 transversely, so as to separate the lower end of each fire hole 13 into three small holes 131.

[0051] refer to Figure 8 , the fourth type, which is different from the first type of metal strip material in that the shape of the dividing strip 2 and the installation method of the dividing strip 2 and the characteristic strip 1 are slightly different. A vertically arranged front card slot 111 is provided at the lower end of the left side wall of each wave crest portion 11 of the characteristic strip 1, and a vertically arranged rear card slot 121 is provided at the lower end of the left side wall of each wave trough portion 12 of the characteristic strip 1. The dividing strip 2 includes a fourth separator 24, and the fourth separator 24 is preferably a small wave strip, which has a plurality of staggered front hollow protrusions and rear hollow protrusions, and the front hollow protrusions and the rear hollow protrusions are both in the shape of a "concave" character, and of course, other shapes can also be used. The small wave strip is transversely arranged in each front card slot 111, each rear card slot 121 and each fire hole 13 and is connected to the characteristic strip 1, and the lower end of each fire hole 13 is divided into two small holes 131 arranged at intervals in front and back by the fourth separator 24.

[0052] refer to Fig. 9The fifth type is different from the first type of metal strip in that a partition 201 located in the fire hole 13 is provided at the position of the partition strip 2 corresponding to the fire hole 13. Specifically, the first partition 21 is a non-small flat strip or a small feature strip, and the partition 201 is formed by stamping the first partition 21 in a partially integrated manner in the front and back or back direction. The partition 201 is in a "V" shape and divides the fire hole 13 into three small holes 131. In other embodiments, the partition 201 may be in a "concave" shape and divide the fire hole 13 into three small holes 131. Of course, the partition 201 may also be designed in other shapes.

[0053] refer to Fig.10 , the sixth type, which is different from the first type of metal strip material, is that the separation belt 2 further includes a plurality of baffles 25, and a baffle 25 connected to the separation belt 2 is provided in each fire hole 13, and the baffle 25 and the separation belt 2 are enclosed to form a "cross" shape, and the baffle 25 divides the small hole 131 into micro holes 132. Specifically, the baffle 25 can be clamped from top to bottom outside the first partition 21 of the separation belt 2, or an opening arranged in the front-to-back direction is provided at the position of the first partition 21 of the separation belt 2 corresponding to the fire hole 13, and the baffle 25 is transversely penetrated through the opening of the first partition 21 and is welded to the first partition 21.

[0054] Example 2

[0055] refer to Fig.11 The difference between this embodiment and embodiment 1 is that the specific structure of the characteristic band 1 is different. Specifically, the characteristic band 1 includes a plurality of alternately arranged flat sections 101 and corrugated sections 102, and the corrugated sections 102 have a plurality of alternately arranged crests 11 and troughs 12, and fire holes 13 are formed between adjacent crests 11, and fire holes 13 are formed between adjacent troughs 12. A vertically arranged dividing strip 2 is connected to the lower end of each corrugated section 102, and the dividing strip 2 is preferably a small flat strip or a narrow flat strip, which respectively passes through each crest 11, each trough 12 and each fire hole 13 of the corrugated section 102 in a transverse direction, and the lower end of each fire hole 13 is divided into at least two small holes 131 by the dividing strip 2.

[0056] After the lower end of each corrugated section 102 of the characteristic band 1 is connected to the dividing band 2, the characteristic band 1 and the dividing band 2 are coiled together to form a honeycomb body 4, and pores for gas to pass through are formed between adjacent coils. At this time, the plane section 101 and the corrugated section 102 are respectively configured to be located on different coils, so that one circle of the honeycomb body 4 is the plane section 101, and the other circle is the corrugated section 102, and the two are alternately arranged in the radial direction. In this way, the honeycomb body 4 has high porosity, is not easy to temper, and has high thermal strength of the fire hole. At the same time, the plane section 101 separates the adjacent corrugated sections 102 in the radial direction from each other, so that the trough 12 and the peak 11 on each coil will not be concave, so that more stable pores can be formed between each coil, and the porosity of the upper end of the pore is higher than that of the lower end.

[0057] refer to Fig.12 Furthermore, at least two rows of first slit groups located above the dividing strip 2 and spaced apart from each other may be provided on each corrugated section 102, and / or at least three or four rows of second slit groups spaced apart from each other may be provided on each plane section 101. In this way, the first slit group and / or the second slit group are conducive to increasing thermal resistance, reducing the heat from the high-temperature combustion zone on the upper side of the honeycomb body 4 being transferred to the lower side of the honeycomb body 4, thereby blocking the movement of the combustion flame toward the lower side of the honeycomb body, and further improving the anti-flashback performance of the honeycomb body.

[0058] The adjacently arranged crest portions 11 and trough portions 12 share a pair of sub-features, and each row of the first slit group includes a plurality of first slits 15 arranged at intervals along the length direction of the corrugated section 102, each first slit 15 is arranged transversely and at least transversely penetrates a pair of sub-features, and the first slits 15 adjacent to each other are arranged alternately. Each row of the second slit group includes a plurality of second slits 31 arranged at intervals along the length direction of the plane section 101, each second slit 31 is arranged transversely, and the second slits 31 adjacent to each other are arranged alternately.

[0059] Example 3

[0060] refer to Figure 13-16 The difference between this embodiment and embodiment 1 is that the metal strip also includes a wide flat strip 3, and a wide flat strip 3 welded to each crest portion 11 is provided in front of the characteristic strip 1, or a wide flat strip 3 welded to each trough portion 12 is provided on the back of the characteristic strip 1.

[0061] In this embodiment, the wide flat belt 3 is welded and fixed to the back of the characteristic belt 1 as an example. After the dividing belt 2 is connected to the lower end of the characteristic belt 1, the wide flat belt 3 is welded and connected to each trough 12 on the characteristic belt 1, so that the dividing belt 2, the characteristic belt 1 and the wide flat belt 3 are connected as a whole. Figure 13-14 Then the three belts are coiled together to form a honeycomb body 4, see Figure 15-16, pores for gas to pass through are formed between adjacent coils. Thus, the honeycomb body 4 achieves high porosity, is not prone to tempering, and has high thermal strength of the fire holes, while preventing the trough 12 and the peak 11 on each coil from being sunken, thereby forming more stable pores between the coils, and the porosity of the upper end of the pore is higher than that of the lower end.

[0062] refer to Figure 17-18 Furthermore, multiple rows of first slit groups are arranged above the dividing band 2 and spaced apart from each other on the characteristic band 1, and multiple rows of second slit groups are arranged spaced apart from each other on the wide flat band 3. In this way, multiple rows of first slit groups and multiple rows of second slit groups are conducive to increasing thermal resistance, reducing the heat from the combustion high temperature zone on the upper side of the honeycomb body 4 to be conducted to the lower side of the honeycomb body 4, so as to block the movement of the combustion flame to the lower side of the honeycomb body, and further improve the anti-flashback performance of the honeycomb body. It is particularly noted that in other embodiments, all first slit groups or all second slit groups can be omitted.

[0063] The adjacently arranged crests 11 and troughs 12 share a pair of sub-features, and each row of the first slit group includes a plurality of first slits 15 arranged at intervals along the length direction of the feature belt 1, each first slit 15 is arranged transversely and at least transversely penetrates a pair of sub-features, and the first slits 15 adjacent to each other are arranged alternately. Each row of the second slit group includes a plurality of second slits 31 arranged at intervals along the length direction of the wide flat belt 3, each second slit 31 is arranged transversely, and the second slits 31 adjacent to each other are arranged alternately.

[0064] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A metal strip, characterized in that: include: A characteristic band (1) having a plurality of alternately arranged wave crests (11) and wave troughs (12), wherein fire holes (13) are formed between adjacent wave crests (11), and fire holes (13) are formed between adjacent wave troughs (12); and A separation strip (2) is connected to the lower end of the characteristic strip (1) and is arranged vertically. The separation strip (2) transversely penetrates each of the wave crests (11), each of the wave troughs (12) and each of the fire holes (13). The lower end of each of the fire holes (13) is divided into at least two small holes (131) by the separation strip (2).

2. A metal strip according to claim 1, characterized in that: The dividing strip (2) comprises a first dividing piece (21), and a vertically arranged first slot (141) is provided at the lower end at the junction of the crest portion (11) and the trough portion (12); the first dividing piece (21) is transversely penetrated through the first slot (141) and the fire hole (13), respectively; and the lower end of each fire hole (13) is divided into at least two small holes (131) by the first dividing piece (21).

3. A metal strip according to claim 1 or 2, characterized in that: The dividing strip (2) comprises a second dividing piece (22), a second slot (142) arranged vertically is provided at the lower front end of each of the wave crest portions (11), the second dividing piece (22) is transversely passed through the second slot (142) and the fire hole (13), and the lower end of each of the fire holes (13) is divided into at least two small holes (131) by the second dividing piece (22); and / or The dividing strip (2) comprises a third dividing piece (23), and a third card slot (143) arranged vertically is provided at the lower end of the rear side of each of the trough portions (12). The third dividing piece (23) is transversely penetrated through the third card slot (143) and the fire hole (13), respectively, and the lower end of each of the fire holes (13) is divided into at least two small holes (131) by the third dividing piece (23).

4. A metal strip according to claim 1, characterized in that: The dividing strip (2) comprises a fourth dividing piece (24), a front card slot (111) arranged vertically is provided at the lower end of the left side wall of each of the crest parts (11), and a rear card slot (121) arranged vertically is provided at the lower end of the left side wall of each of the trough parts (12), the fourth dividing piece (24) is respectively transversely penetrated through the front card slot (111), the rear card slot (121) and the fire hole (13) and is connected to the characteristic strip (1), and the lower end of each of the fire holes (13) is divided into at least two small holes (131) by the fourth dividing piece (24).

5. The metal strip according to claim 1, characterized in that: A partition (201) located inside the fire hole (13) is provided at a position of the partition strip (2) corresponding to the fire hole (13), and the partition (201) divides the fire hole (13) into at least three small holes (131).

6. A metal strip according to claim 1, characterized in that: A baffle (25) that cooperates with and engages with the separation belt (2) is provided in each of the fire holes (13), and the baffle (25) divides the small hole (131) into two micro holes.

7. A metal strip according to claim 1, characterized in that: A plurality of rows of first slit groups are provided on the characteristic band (1), which are located above the dividing band (2) and are spaced apart from each other in the upper and lower directions. Each row of the first slit groups comprises a plurality of first slits (15) spaced apart from each other in the length direction of the characteristic band (1). Each of the first slits (15) is arranged transversely, and the first slits (15) adjacent to each other in the upper and lower directions are arranged in a staggered manner.

8. A metal strip according to claim 7, characterized in that: The adjacently arranged wave crest portions (11) and wave trough portions (12) share a pair of sub-features, and each of the first slits (15) at least transversely penetrates a pair of the features.

9. A metal strip according to any one of claims 1 or 5-8, characterized in that: The characteristic band (1) comprises a plurality of alternately arranged flat sections (101) and corrugated sections (102), wherein the corrugated sections (102) have a plurality of alternately arranged wave crests (11) and wave troughs (12).

10. A metal strip according to claim 9, characterized in that: A plurality of rows of second slit groups are arranged at intervals in the upper and lower directions on the plane section (101), each row of the second slit groups comprises a plurality of second slits (31) arranged at intervals along the length direction of the plane section (101), each second slit (31) is arranged transversely, and upper and lower adjacent second slits (31) are arranged in a staggered manner.

11. A metal strip according to any one of claims 1 or 5-8, characterized in that: It also includes a wide flat belt (3), wherein the wide flat belt (3) connected to each of the wave crests (11) is provided in front of the characteristic belt (1), or the wide flat belt (3) connected to each of the wave troughs (12) is provided on the back of the characteristic belt (1).

12. A metal strip according to claim 11, characterized in that: The wide flat belt (3) is provided with a plurality of rows of second slit groups spaced apart from each other in the upper and lower directions, each row of the second slit groups comprising a plurality of second slits (31) spaced apart from each other in the length direction of the wide flat belt (3), each second slit (31) being arranged transversely, and the second slits (31) adjacent to each other in the upper and lower directions being arranged in a staggered manner.

13. A honeycomb heating element, characterized in that: It comprises a honeycomb body (4), which is formed by winding a metal strip as described in any one of claims 1 to 12, with pores for gas to pass through formed between adjacent winding circles, and the porosity of the upper end of the pore is greater than the porosity of the lower end of the pore.

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