Post-treatment catalytic heater

Abstract

The utility model discloses a post-processing catalytic heater, the post-processing catalytic heater comprises a shell, a heating assembly and a binding post, the shell is provided with an accommodating cavity, the heating assembly is accommodated in the accommodating cavity, the side wall of the shell is provided with a mounting hole, and the mounting hole is communicated with the accommodating cavity; the heating assembly comprises at least one heating belt, the heating belt comprises a plurality of large-wave heating strips and small-wave heating strips which are sequentially arranged in parallel in a staggered mode, and the large-wave heating strips and the small-wave heating strips are staggered to form a plurality of honeycomb type small holes; the binding post is fixedly connected with the heating belt, one end of the binding post penetrates through the installation hole and extends out of the shell, the binding post and the shell are arranged in an insulated mode, and a locking structure for fixing the binding post is installed on the binding post. The space is arranged between the heating belt and the inner wall of the shell so that the air cooling effect of the outer ring can be improved, the heating belt and the binding posts are in conductive connection through the conductive fixing pieces, the local heating problem is avoided, the reliability is guaranteed, and the product durability is improved through rolling forming of the heating strips.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of electric heating, especially relates to a post-processing catalytic heater. BACKGROUND

[0002] The heater in the exhaust system is a post-processing component for rapidly heating the tail gas, and the heater usually uses the SCR technology (i.e. selective catalytic reduction technology) in the exhaust gas recirculation. The common design of the heater is an electric heating conductor for heat transfer.

[0003] The conventional heating assembly or post-processing catalytic heater on the market has many defects, especially the disc-shaped or polygonal heating assembly, which looks uniformly distributed, but the outer ring air cooling effect is not good. In addition, the heating assembly is generally prepared by stamping, but stamping connection is easy to form local thinning, and the heating time is long and easy to burn out. In addition, the terminal post on the market is generally designed to use a threaded head and a smooth rod, and is fixed with the heating band by welding. Although the assembly is simple, the reliability is not good, and the customer assembly is easy to twist and deform the lower heating band, which seriously causes short circuit. At the same time, the terminal post and the heating band are generally directly connected by welding, which is easy to produce large contact resistance, local serious heating and easy to burn out.

[0004] Therefore, in view of the above-mentioned technical problems, it is necessary to provide a new technical scheme. UTILITY MODEL CONTENT

[0005] To at least solve one of the technical problems existing in the prior art, the utility model provides a post-processing catalytic heater. The specific technical scheme is as follows:

[0006] The utility model provides a post-processing catalytic heater, the post-processing catalytic heater includes the casing, heating assembly and terminal post, and the casing is provided with the accommodation cavity, and the accommodation cavity contains heating assembly, and the lateral wall of casing is equipped with the mounting hole, and the mounting hole is linked together with the accommodation cavity,

[0007] The heating assembly includes at least one heating band, and the heating band includes a plurality of large wave heating strips and small wave heating strips arranged in turn staggeredly and in parallel, and the large wave heating strips and the small wave heating strips stagger to form a plurality of honeycomb type small holes.

[0008] The terminal post is fixedly connected with the heating band, one end of the terminal post passes through the mounting hole and extends out of the casing, the terminal post is insulated from the casing, and the locking structure for fixing the terminal post is installed on the terminal post.

[0009] As one preferred scheme of the utility model, the heating belt is fixedly installed with a conductive fixed sheet, the binding post is fixedly connected with the conductive fixed sheet, one end of the binding post passes through the mounting hole and extends to outside the shell, the binding post is insulated from the shell, and the locking structure for fixing the binding post is installed on the binding post.

[0010] As one preferred scheme of the utility model, the heating belt is fixedly installed with a conductive fixed sheet, the binding post is fixedly connected with the conductive fixed sheet, one end of the binding post passes through the mounting hole and extends to outside the shell, the binding post is insulated from the shell, and the locking structure for fixing the binding post is installed on the binding post.

[0011] As one preferred scheme of the utility model, the support rod is fixedly arranged on the support, and the insulating tube is installed on the support rod.

[0012] As one preferred scheme of the utility model, the binding post is provided with a double thread structure on the side close to the outside of the shell, and the locking structure is a fixed nut.

[0013] As one preferred scheme of the utility model, the large wave heating strip is a roll forming heating strip.

[0014] As one preferred scheme of the utility model, the small wave heating strip is a roll forming heating strip.

[0015] As one preferred scheme of the utility model, the distance between the heating belt and the inner wall of the accommodating cavity is not less than 8 mm.

[0016] As one preferred scheme of the utility model, the heating belt is coiled to form a vortex heating disc.

[0017] As one preferred scheme of the utility model, the two ends of the heating belt are coiled on the outside of the heating disc.

[0018] As one preferred scheme of the utility model, the ceramic tube is sleeved on the binding post, the ceramic tube sleeved on the binding post is accommodated in the mounting hole, and the binding post is insulated from the mounting hole through the ceramic tube.

[0019] In addition, the preparation of the post-processing catalytic heater provided by the utility model specifically comprises the following steps:

[0020] S1: the support is fixedly installed in the accommodating cavity of the shell, and the insulating tube is installed on the support rod of the support one by one;

[0021] S2: the large wave heating strip and the small wave heating strip are fixedly connected in sequence to form a heating belt, the large wave heating strip and the small wave heating strip form a honeycomb type small hole, the heating belt is coiled to form a vortex heating disc, and the two ends of the heating belt are coiled on the outside of the heating disc.

[0022] S3: install the coiled heating disc on the support, and the insulating tube sleeved on the support rod extends into the honeycomb small holes;

[0023] S4: the end of the heating belt is provided with a conductive heating sheet, one end of the terminal post is fixedly connected to the conductive heating sheet, the other end of the terminal post extends out of the shell through the mounting hole on the shell, and the side of the terminal post close to the outside of the shell is fixedly provided with a locking structure.

[0024] Preferably, in step S2, the large-wave heating strip and the small-wave heating strip are respectively roll-formed.

[0025] Preferably, in step S3, the spacing between the heating belt and the inner wall of the accommodating cavity is not less than 8 mm.

[0026] Preferably, in step S4, the surface of the terminal post close to the outside of the shell is provided with a double-thread structure, and the inner thread of the locking structure is screwed on the double-thread structure.

[0027] Compared with the prior art, the technical scheme of the utility model has at least one or more beneficial effects as follows:

[0028] The post-processing catalytic heater is used for rapidly heating tail gas in an exhaust system, the gas flows through the heating disc, the gas flowing through the heating disc is heated by convection, and the heated gas transmits heat to the catalyst along the direction of the gas flow. The heating belt is designed with honeycomb small holes to better transmit heat.

[0029] The spacing of not less than 8 mm between the heating belt and the inner wall of the shell is arranged to improve the air cooling effect of the outer ring, improve the reliability of the product, and increase the service life.

[0030] Compared with the traditional punch forming, the large-wave heating strip and the small-wave heating strip are roll-formed, the product durability is improved, the service life is improved, the generation of defective products is avoided, and the labor cost is reduced.

[0031] The post-processing catalytic heater can obtain different power or heating effects by adjusting the resistance or structure of the vortex honeycomb heating belt to adapt to different requirements, and the method for changing the resistance includes modifying the width or length of the heating belt; then the heating resistance is arranged in the required range, for example, 150 mΩ to 750 mΩ. The heat resistance of the heating belt is determined by the cross-sectional area and length of the heating belt, so the large-wave heating strip and the small-wave heating strip preferably use an electric heating alloy material with constant heat resistance.

[0032] The terminal post is provided with a double-thread structure to fix the terminal post, the tightening torque is used to ensure sufficient torque, the stress after assembly with the heating disc is reduced, the terminal post can be more firmly fixed, and the service life of the product is improved.

[0033] The heating band and the terminal post are conductively connected through the conductive fixing sheet, local heating problems are avoided, reliability is ensured, and the service life of the product is improved.

[0034] Additional aspects and advantages of the present application will be described in part below with reference to the description and drawings, will become apparent from the description below, or will be understood from the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical scheme of the present application, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0036] Figure 1 is a top view structural schematic diagram of the post-processing catalytic heater;

[0037] Figure 2 is a side view structural schematic diagram of the post-processing catalytic heater;

[0038] Figure 3 is Figure 1 a partial enlarged schematic diagram;

[0039] Figure 4 is a top view structural schematic diagram of the heating band, the supporting rod and the insulating tube;

[0040] Figure 5 is a partial structural schematic diagram of one example of the heating band;

[0041] Figure 6 is a partial structural schematic diagram of another example of the heating band.

[0042] Wherein, 1 - shell, 2 - heating assembly, 3 - terminal post, 11 - containing cavity, 13 - support, 14 - supporting rod, 15 - insulating tube, 21 - heating band, 22 - large wave heating strip, 23 - small wave heating strip, 24 - honeycomb type small hole, 25 - conductive fixing sheet, 26 - double conductive fixing sheet, 31 - fixed nut, 32 - connecting nut, 33 - first terminal post, 34 - second terminal post, 35 - ceramic tube. DETAILED DESCRIPTION

[0043] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0044] In the description of this utility model, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "provided with," "equipped with," "connected," "installed," "sleeved," "opened," and "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

[0047] Please refer to Figures 1-6 ,like Figures 1-6 As shown, this utility model provides a post-treatment catalytic heater, which includes a housing 1, a heating component 2 and a terminal block 3. The housing 1 is provided with a receiving cavity 11, and the heating component 2 is placed inside the receiving cavity 11. The side wall of the housing 1 is provided with a mounting hole, which is connected to the receiving cavity 11.

[0048] The heating assembly 2 comprises at least one heating band 21, the heating band 21 comprising a plurality of large-wave heating strips 22 and small-wave heating strips 23 arranged in alternation, the large-wave heating strips 22 and the small-wave heating strips 23 being arranged in alternation to form a plurality of honeycomb-shaped small holes 24;

[0049] The heating band 21 is fixedly provided with an electrically-conductive fixing sheet 25, and the terminal post 3 is fixedly connected with the electrically-conductive fixing sheet 25, one end of the terminal post 3 extending out of the housing through the mounting hole, the terminal post 3 being arranged in insulation with the housing 1, and the terminal post 3 being provided with a locking structure for fixing the terminal post 3.

[0050] In an example, the catalyst is arranged on one side of the heating band.

[0051] The post-treatment catalytic heater is used for rapidly heating tail gas in an exhaust system, gas flows through the heating disc, and the gas flowing through the heating disc is heated by convection, and the heated gas transmits heat to the catalyst along the direction of gas flow.

[0052] In a preferred embodiment, as shown in Figure 1 , Figures 4-6 , the large-wave heating strips 22 and the small-wave heating strips 23 are connected in alternation to form the heating band. In an example, preferably, the wave amplitude of the large-wave heating strips 22 is greater than the wave amplitude of the small-wave heating strips 23. In an example, the large-wave heating strips 22 are roll-formed heating strips. In an example, the small-wave heating strips 23 are roll-formed heating strips. In a preferred embodiment, as shown in Figure 5 , the heating band 21 comprises three large-wave heating strips 22 and four small-wave heating strips 23, the large-wave heating strips 22 and the small-wave heating strips 23 being fixedly connected in alternation along the radial direction of the heating band, and the two sides of the heating band being provided with the small-wave heating strips 23. In another preferred embodiment, as shown in Figure 6 , the heating band 21 comprises four large-wave heating strips 22 and five small-wave heating strips 23, the large-wave heating strips 22 and the small-wave heating strips 23 being fixedly connected in alternation along the radial direction of the heating band, and the two sides of the heating band being provided with the small-wave heating strips 23. In an example, the large-wave heating strips 22 and the small-wave heating strips 23 are thin metal flat strips. Compared with the traditional stamping forming, the large-wave heating strips 22 and the small-wave heating strips 23 are roll-formed, which improves the product durability, prolongs the service life, avoids the generation of defective products, and reduces the labor cost. The large-wave heating strips 22 and the small-wave heating strips 23 form honeycomb-shaped small holes to better transmit heat.

[0053] In a preferred example, as shown in Figure 1 and Figure 4As shown, the heating band 21 is coiled to form a spiral heating disc. Further preferably, both ends of the heating band 21 are coiled on the outside of the heating disc. Preferably, the heating band 21 can be one or more. Multiple heating bands 21 can be arranged according to the parallel direction of the heating band 21 plane, or can be arranged according to the vertical direction of the heating band 21 plane. In the example, as shown in Figure 1 As shown, the terminal post 3 has two, namely the first terminal post 33 and the second terminal post 34, and the heating band 21 has two, which are arranged in the direction perpendicular to the plane of the heating band 21, and one end of the two heating bands is conductively connected through the double-conductive fixing piece 26, the other end of one heating band is conductively connected with the first terminal post 33, and the other end of the other heating band is conductively connected with the second terminal post 34.

[0054] Preferably, the spacing between the heating band 21 and the inner wall of the accommodating cavity 11 is not less than 8mm. The spacing between the heating band 21 and the inner wall of the accommodating cavity 11 is not less than 8mm, which is arranged to improve the air cooling effect of the outer ring, improve the reliability of the product, and increase the service life.

[0055] The post-processing catalytic heater of the utility model, in order to be able to obtain different power or heating effect, the resistance or structure of spiral honeycomb heating band is adjusted to adapt to different needs, and the method of changing resistance includes modifying the width or length of the heating band;Then the heating resistance is set in the required range, for example, 150mΩ to 750mΩ. The heat resistance of the heating band is determined by the cross-sectional area and length of the heating band, so the large wave heating strip and the small wave heating strip are preferably made of an electric heating alloy material with constant heat resistance. Therefore, the length of the heating assembly and the resulting heating resistance can be adjusted by the width, length or cross-sectional area of the heating band.

[0056] In the preferred embodiment, as shown in Figure 1 As shown, the support 13 is fixedly arranged in the accommodating cavity, and the heating band 21 is fixedly installed on the support 13. Preferably, the support 13 is fixedly provided with a support rod 14, and the support rod 14 is installed with an insulating tube 15. The support rod 14 sleeved with the insulating tube 15 extends into the honeycomb type small hole to define the position of the heating band. The insulating tube 15 is configured to insulate the support 13 from the heating band 21. In the example, the support 13 has a central-to-circumferential scattering structure, and the support rod 14 is spaced apart at positions corresponding to each circle of the heating disc to define the heating disc. In the example, the support rod 14 is a fixed needle made of heat-resistant steel. In the example, the insulating tube is a ceramic insulating tube.

[0057] In the preferred embodiment, the terminal post 3 is provided with a double thread structure on the side close to the outside of the shell 1, and the inner thread of the locking structure is screwed to the double thread structure. Further preferably, the locking structure comprises two fixing nuts 31, and the two fixing nuts are sleeved on the terminal post. In one example, the double thread structure is provided with two opposite threads that overlap each other. In another example, in the axial direction of the terminal post, the double thread structure is provided with threads of one direction and threads of the opposite direction that are alternately arranged in sequence. The terminal post is provided with the double thread structure to fix the terminal post, and the sufficient torque is ensured by the tightening torque, the stress after assembly with the heating disc is reduced, the terminal post can be more firmly fixed, and the service life of the product is improved.

[0058] In the example, the side of the terminal post 3 in the accommodating cavity is also sleeved with a connecting nut 32.

[0059] In the preferred example, as shown in Figure 1 the other end of the heating belt 21 is fixedly connected with the conductive fixing sheet 25, the terminal post 3 is fixedly connected with the conductive fixing sheet 25, the terminal post 3 is extended out of the shell 1 through the mounting hole after being fixedly connected with the conductive fixing sheet 25, and the fixing nut is screwed to the end of the terminal post extended out of the shell to fix the terminal post. Preferably, the terminal post 3 is sleeved with the connecting nut 32 and extended out of the shell 1 through the mounting hole, and the connecting nut 32 is stopped on the side of the mounting hole close to the accommodating cavity 11. Preferably, the terminal post 3 is sleeved with a ceramic tube, the ceramic tube is accommodated in the mounting hole, and the terminal post 3 is insulated from the mounting hole through the ceramic tube. Further preferably, the ceramic tube is a threaded ceramic tube, and the threaded ceramic tube is screwed to the terminal post 3. In the example, the terminal post 3 is welded to the conductive fixing sheet 25. In the example, the other end of the heating belt 21 is clamped to the conductive fixing sheet 25. The heating belt and the terminal post are conductively connected through the conductive fixing sheet, the local heating problem is avoided, the reliability is ensured, and the service life of the product is improved.

[0060] The preparation method of the post-processing catalytic heater comprises the following steps:

[0061] S1: the bracket is fixedly installed in the accommodating cavity of the shell, and the insulating tubes are installed on the support rods of the bracket one by one;

[0062] S2: the large-wave heating strip and the small-wave heating strip are fixedly connected in sequence to form a heating belt, the large-wave heating strip and the small-wave heating strip form a honeycomb type small hole therebetween, and the heating belt is coiled to form a vortex heating disc, wherein the two ends of the heating belt are coiled on the outside of the heating disc;

[0063] S3: the coiled heating disc is installed on the bracket, and the insulating tubes sleeved on the support rods are inserted into the honeycomb type small hole;

[0064] S4: the end of the heating band is provided with a conductive fixing sheet, one end of the terminal post is fixedly connected to the conductive fixing sheet, the other end of the terminal post extends out of the shell through the mounting hole on the shell, and the side of the terminal post close to the outside of the shell is fixedly provided with a locking structure.

[0065] In a preferred example, in step S1, the support is in a central-to-circumferential scattering structure.

[0066] Preferably, in step S2, support rods 14 are arranged at positions corresponding to each circle of the heating disc on the support to define the heating disc.

[0067] Preferably, in step S2, the large-wave heating strip is roll-formed.

[0068] Preferably, in step S2, the small-wave heating strip is roll-formed.

[0069] Preferably, in step S3, the spacing between the heating band and the inner wall of the accommodating cavity is not less than 8 mm.

[0070] Preferably, in step S4, the surface of the terminal post close to the outside of the shell is provided with a double-thread structure, and the inner thread of the locking structure is threadedly connected to the double-thread structure. Further preferably, the locking structure comprises two fixed nuts, and the two fixed nuts are sleeved on the terminal post. In one example, the double-thread structure is provided with two opposite threads that are overlapped. In another example, in the axial direction of the terminal post, the double-thread structure is provided with threads of one direction and threads of the opposite direction that are alternately arranged.

[0071] The technical features of all components of the above specific embodiments can be freely combined without conflict.

[0072] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "yet another embodiment", "another embodiment", "other embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, persons skilled in the art can combine and combine different embodiments or examples described in the present specification.

[0073] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications and variations to the above embodiments within the scope of the present application.

Claims

1. A post-processing catalytic heater, characterized by, The post-processing catalytic heater comprises a shell (1), a heating assembly (2) and a terminal post (3), the shell (1) is provided with a containing cavity (11), the containing cavity (11) contains the heating assembly (2), a mounting hole is formed in the side wall of the shell (1) and is communicated with the containing cavity (11); The heating assembly (2) comprises at least one heating band (21), the heating band (21) comprises a plurality of large-wave heating strips (22) and small-wave heating strips (23) which are arranged in parallel and staggered in sequence, and the large-wave heating strips (22) and the small-wave heating strips (23) are staggered to form a plurality of honeycomb small holes (24); The heating band (21) is fixedly provided with an electrically-conductive fixing sheet (25), the terminal post (3) is fixedly connected with the electrically-conductive fixing sheet (25), one end of the terminal post (3) penetrates through the mounting hole and extends out of the shell, the terminal post (3) is insulated from the shell (1), and the terminal post (3) is provided with a locking structure for fixing the terminal post (3).

2. The aftertreatment catalytic heater of claim 1, wherein, The containing cavity is fixedly provided with a support (13), and the heating band (21) is fixedly installed on the support (13).

3. The aftertreatment catalytic heater of claim 2, wherein, The support (13) is fixedly provided with a support rod (14), and the support rod (14) is installed with an insulating tube (15), the support rod (14) sleeved with the insulating tube (15) extends into the honeycomb small hole, and the insulating tube (15) is configured to insulate the support (13) from the heating band (21).

4. The aftertreatment catalytic heater of claim 1, wherein, The terminal post (3) is provided with a double-thread structure on the side close to the shell (1), and the locking structure is a fixed nut (31) which is threadedly connected with the double-thread structure.

5. The aftertreatment catalytic heater of claim 1, wherein, The large-wave heating strip (22) is a roll-formed heating strip; and / or The small-wave heating strip (23) is a roll-formed heating strip.

6. The aftertreatment catalytic heater of claim 1, wherein, The distance between the heating band (21) and the inner wall of the containing cavity (11) is not less than 8 mm.

7. The aftertreatment catalytic heater of claim 1, wherein, The heating band (21) is coiled to form a vortex heating disc.

8. The aftertreatment catalytic heater of claim 7, wherein, Both ends of the heating band (21) are coiled on the outside of the heating disc.

9. The aftertreatment catalytic heater of claim 1, wherein, The terminal post (3) is sleeved with a ceramic tube, the ceramic tube sleeved on the terminal post is contained in the mounting hole, and the terminal post (3) is insulated from the mounting hole through the ceramic tube.

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