Instrument board air duct structure and installation method

Abstract

The invention discloses an instrument panel air duct structure and an installation method, solves the problem of poor installation reliability of a negative ion emission head module caused by direct connection of the negative ion emission head module and an instrument panel air duct in the prior art, and has the beneficial effects of ensuring the assembly reliability and improving the assembly efficiency. According to the specific scheme, the dashboard air duct structure comprises a dashboard air duct, the dashboard air duct is provided with an installation support, the installation support is fixedly connected with the dashboard air duct, the surface of the installation support is provided with a stop groove, the installation support is provided with an installation hole, the side portion of the installation hole is provided with at least one groove, and one side of a negative ion emission head module is provided with a first protruding part. One end of the negative ion emission head module enters the mounting hole and the groove, the negative ion emission head module is rotated relative to the mounting bracket after entering, so that the mounting bracket is connected with the negative ion emission head module in a clamping manner, and the first convex part gradually enters the stop groove to limit continuous rotation of the negative ion emission head module.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and in particular to an instrument panel air duct structure and an installation method thereof. Background Art

[0002] The statements in this part only provide background technical information related to the present invention, and do not necessarily constitute prior art.

[0003] In some existing vehicles, a negative ion emitter module is added at the air duct for blowing air to the face on the back of the instrument panel. The negative ion emitter module can generate ecological small-sized negative oxygen ions with small particle size, high activity and long migration distance through a weak current, which is beneficial to improving the competitiveness of automotive products. The inventor found that there are many components near the air duct for blowing air to the face, so that the installation space of the negative ion emitter module is limited.

[0004] In the prior art, the negative ion module is directly snapped into the instrument panel air duct part. Since the air duct for blowing air to the face adopts the blow molding process, the accuracy of the blow molding process is not high, it is difficult to maintain the consistency of the wall thickness of the air duct, and the strength is insufficient. After the negative ion emitter module is installed, there is an easy problem of unreliable fastening, and the negative ion emitter module is likely to fall off on bumpy roads, resulting in the failure of the corresponding function and generating abnormal noises. Moreover, because the negative ion module is directly snapped into the instrument panel air duct part, and the instrument panel air duct part is a blow molded part, it is difficult to embody the limiting, guiding and anti-misassembly structures for the negative ion emitter module. If there is no limiting structure, there may be a problem of slipping during installation. If there is no guiding and anti-misassembly structure, it is easy to install it in the wrong direction and requires reinstallation, resulting in low assembly efficiency.

[0005] In addition, the existing negative ion emitter module is prone to misinstallation problems during installation. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide an instrument panel air duct structure to improve the reliability of assembly and reduce the probability of functional failure of the negative ion emitter module.

[0007] To achieve the above purpose, the present invention is realized through the following technical solutions:

[0008] An instrument panel air duct structure includes an instrument panel air duct. An installation bracket is provided on the instrument panel air duct. The installation bracket is fixedly connected to the instrument panel air duct. A stop groove is provided on the surface of the installation bracket. Installation holes are provided on the installation bracket. At least one groove is provided on the side of the installation hole. A first convex portion is provided on one side of the negative ion emitter module. One end of the negative ion emitter module enters the installation hole and the groove. After entering, the negative ion emitter module is rotated relative to the installation bracket so that the installation bracket and the negative ion emitter module are snap-fitted. The first convex portion gradually enters the stop groove to limit the continuous rotation of the negative ion emitter module.

[0009] For the above air duct structure, first install the mounting bracket on the instrument panel air duct to avoid direct installation of the negative ion emitter head module and the instrument panel air duct. The mounting bracket serves as an intermediate structural member to ensure the installation strength of the negative ion emitter head module. The mounting bracket and the negative ion emitter head module can be snap-connected, and through the cooperation of the first convex portion and the stop groove, the accurate installation of the negative ion emitter head module is guided, and excessive rotation is avoided, improving the assembly efficiency.

[0010] For an instrument panel air duct structure as described above, the distance between the mounting bracket and the outlet of the instrument panel air duct is less than or equal to 400 mm, and the mounting bracket is spaced from the surrounding parts to reduce the risk of friction noise caused by clearance pins.

[0011] The mounting bracket is an injection-molded part, and the wall thickness around the mounting hole of the mounting bracket is the same to ensure the reliability of the connection between the negative ion emitter head module and the mounting bracket.

[0012] For an instrument panel air duct structure as described above, a guiding portion is provided on the surface of the mounting bracket, the guiding portion is connected to the stop groove, and the first convex portion can move along the guiding portion into the stop groove.

[0013] The guiding portion includes an inclined surface section and a flat surface section, and the inclined surface section is connected to the flat surface section. The setting of the guiding portion guides the rotation of the negative ion emitter head module to avoid incorrect installation direction of the negative ion emitter head module.

[0014] For an instrument panel air duct structure as described above, the height of the stop groove is greater than the height of the guiding portion to effectively position the first convex portion through the stop groove, and the overlapping amount between the stop groove and the first convex portion is greater than or equal to 3 mm to ensure the limit of the first convex portion and prevent the first convex portion from rotating excessively and disengaging from the stop groove, resulting in functional failure.

[0015] The unilateral gap between the first convex portion and the side wall of the stop groove is between 0.1 mm and 0.5 mm.

[0016] For an instrument panel air duct structure as described above, the first convex portion is L-shaped, the longer side of the first convex portion is connected to the middle section of the negative ion emitter head module, and the shorter side of the first convex portion is arranged downward so that the shorter side of the first convex portion can be limited by the side wall of the stop groove.

[0017] For an instrument panel air duct structure as described above, the negative ion emitter head module is circumferentially provided with a protruding edge and a second convex portion. The diameter of the protruding edge is greater than the width of the mounting hole, the second convex portion is located below the protruding edge, a limiting groove is formed between the protruding edge and the second convex portion, and the mounting bracket is in interference fit with the limiting groove.

[0018] An instrument panel air duct structure as described above, wherein there are multiple grooves at the installation holes, and the adjacent two grooves are arranged at a set angle interval, the widths of the grooves are different, and the grooves correspond to the second convex parts of the negative ion emission head module one by one. The size of the second convex part is adapted to the size of the groove, so that one end of the negative ion emission head module is directly inserted into the groove, ensuring that the negative ion emission head module can be accurately installed and avoiding misinstallation.

[0019] The first convex part and the second convex part are arranged in a dislocation manner, and the stop groove is located between two adjacent grooves, so as to realize the quick and accurate installation of the negative ion emission head module through the cooperation of the stop groove and the first convex part.

[0020] An instrument panel air duct structure as described above, wherein the middle part of the installation bracket protrudes upward, through holes are respectively arranged on both sides of the installation bracket, the installation bracket is riveted to the instrument panel air duct, and a notch is arranged on one side of the installation bracket.

[0021] An arrow indicating block is arranged on the surface of the installation bracket to indicate the rotation direction of the negative ion emission head module for correct installation prompt.

[0022] An instrument panel air duct structure as described above, wherein the instrument panel air duct is provided with a concave part, and limiting ribs are respectively arranged on both sides of the concave part. The structures of the limiting ribs on both sides are different. One end of one of the limiting ribs is clamped into the notch of the installation bracket to further avoid misinstallation of the negative ion emission head module.

[0023] A wire harness bracket is arranged at the instrument panel air duct. The wire harness bracket is arranged at an interval distance from the installation bracket. The wire harness bracket is provided with a bayonet, and the wire harness of the negative ion emission head module is clamped into the bayonet of the wire harness bracket.

[0024] In the second aspect, the present invention also provides an installation method for a negative ion emission head module, adopting the instrument panel air duct structure as described above, including the following contents:

[0025] Manufacture the installation bracket and the negative ion emission head module.

[0026] Install the installation bracket at the instrument panel air duct.

[0027] One end of the negative ion emission head module enters the installation hole and the groove. After entering, rotate the negative ion emission head module relative to the installation bracket so that the installation bracket and the negative ion emission head module are snap-connected. The side part of the negative ion emission head module gradually enters the stop groove to limit the continuous rotation of the negative ion emission head module.

[0028] The beneficial effects of the present invention are as follows:

[0029] 1) In the present invention, an installation bracket is provided. The installation bracket serves as an intermediate transition connecting member. The negative ion emitter cooperates with the installation bracket rather than directly with the instrument panel air duct. The installation bracket, as an intermediate structural member, ensures the installation strength of the negative ion emitter head module. The installation bracket and the negative ion emitter head module can be snap-fitted, and through the cooperation of the first convex portion and the positioning groove, the accurate installation of the negative ion emitter head module is guided, avoiding excessive rotation and eliminating the need for repeated installation, thereby improving the assembly efficiency.

[0030] 2) In the present invention, the installation bracket is connected to the instrument panel air duct and the installation bracket is connected to the negative ion emitter head module, so that the instrument panel air duct and the negative ion emitter head module form an integral body. The installation of the negative ion emitter head module only requires one person to operate without the need for auxiliary tools, which can reduce personnel and man-hours, and lower costs. Moreover, the installation bracket can be replaced, which can minimize product design changes, reduce costs, and achieve functions.

[0031] 3) In the present invention, the installation bracket is provided with a protruding edge and a second convex portion, and a limiting groove is formed therebetween. During the rotation of the negative ion emitter head module relative to the installation bracket, the installation bracket is snapped into the limiting groove and the two are in interference fit, effectively ensuring the reliability of the connection between the installation bracket and the negative ion emitter head module. Even on bumpy roads, it is not easy for the negative ion emitter head module to fall off.

[0032] 4) In the present invention, the height of the positioning groove is greater than the height of the guiding portion to effectively position the first convex portion through the positioning groove. The overlapping amount of the positioning groove and the first convex portion is greater than or equal to 3 mm to ensure the limitation of the first convex portion and prevent the first convex portion from rotating excessively and disengaging from the positioning groove, resulting in functional failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0034] Figure 1 is a schematic diagram of an installation bracket in an instrument panel air duct structure according to one or more embodiments of the present invention.

[0035] Figure 2 is a schematic diagram of a negative ion emitter head module in an instrument panel air duct structure according to one or more embodiments of the present invention.

[0036] Figure 3 is a schematic diagram of the installation of an instrument panel air duct structure according to one or more embodiments of the present invention.

[0037] Figure 4 is a schematic cross-sectional view of the installation location of an instrument panel air duct structure according to one or more embodiments of the present invention.

[0038] Figure 5 It is a schematic diagram of a wire harness bracket in an instrument panel air duct structure according to one or more embodiments of the present invention.

[0039] Figure 6 It is an overall schematic diagram of an instrument panel air duct structure according to one or more embodiments of the present invention.

[0040] In the figure: The distances or dimensions between each part are exaggerated for showing the positions of each part, and the schematic diagram is only for illustration.

[0041] Wherein: 1. Instrument panel air duct, 1.1. First limiting rib, 1.2. Second limiting member, 1.3. Wire harness bracket;

[0042] 2. Mounting bracket, 2.1. Position-limiting groove, 2.2. Convex block, 2.3. Convex platform, 2.4. Mounting hole, 2.5. Groove, 2.6. Through hole, 2.7. Third limiting rib, 2.8. Fourth limiting rib, 2.9. Arrow indicating block, 2.10. Guiding part, 2.11. Notch;

[0043] 3. Negative ion emission head module, 3.1. First convex part, 3.2. Protruding edge, 3.3. Second convex part, 3.4. Wire harness;

[0044] 4. Rivet. Specific embodiments

[0045] It should be noted that the following detailed description is exemplary and is intended to provide further illustration of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0046] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the present invention otherwise clearly indicates, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof;

[0047] As introduced in the background art, in the prior art, the direct connection between the negative ion emission head module and the instrument panel air duct results in the problem of poor installation reliability of the negative ion emission head module. To solve the above technical problems, the present invention proposes an instrument panel air duct structure.

[0048] Embodiment 1

[0049] In a typical embodiment of the present invention, referring to Figure 1 , Figure 2 , Figure 3 andFigure 6 As shown in the figure, an instrument panel air duct structure includes an instrument panel air duct 1. An installation bracket 2 is provided on the instrument panel air duct 1, and the installation bracket 2 is fixedly connected to the instrument panel air duct 1. A positioning groove 2.1 is provided on the surface of the installation bracket 3, and an installation hole 2.4 is provided on the installation bracket. At least one groove 2.5 is provided on the side of the installation hole 2.4. One side of the negative ion emitter module 3 is provided with a first convex portion 3.1. One end of the negative ion emitter module 3 enters the installation hole and the groove. After entering, rotate the negative ion emitter module 3 relative to the installation bracket 2 so that the installation bracket 2 and the negative ion emitter module 3 are snap-connected. The first convex portion 3.1 gradually enters the positioning groove to limit the continuous rotation of the negative ion emitter module 3.

[0050] It should be noted that the negative ion emitter module 3 is arranged on the flat large surface of the instrument panel air duct 1 (the face-blowing air duct), avoiding the undulating modeling features, so that the structural installation surface can be closely attached to the instrument panel air duct, improving the product strength and consistency.

[0051] In this embodiment, the distance between the installation bracket 2 and the outlet of the instrument panel air duct 1 is less than or equal to 400 mm, preferably less than or equal to 350 mm. The installation bracket 1 is spaced from the surrounding parts, and the minimum clearance is 5 mm, reducing the risk of friction noise caused by clearance pins, ensuring the visibility and operability during installation, and at the same time preventing the risk of noise caused by too small gaps between surrounding parts.

[0052] It is easy to understand that the instrument panel air duct 1 is provided with a recess, which is formed during the blow molding process of the instrument panel air duct. Limiting ribs are respectively provided on both sides of the recess, and the structures of the limiting ribs on both sides are different. One end of one of the limiting ribs is clamped into the notch of the installation bracket, further preventing the installation of the negative ion emitter module from being incorrect.

[0053] It is easy to understand that a first limiting rib 1.1 and a second limiting rib 1.2 are respectively provided on both sides of the recess of the instrument panel air duct. The first limiting rib 1.1 and the second limiting rib 1.2 are arranged diagonally. One end of the first limiting rib can be bent so that the limiting rib can cooperate with the notch of the installation bracket.

[0054] Specifically, the installation bracket 2 is an injection molded part, and the wall thickness around the installation hole 2.4 of the installation bracket 2 is the same, ensuring the reliability of the connection between the negative ion emitter module 3 and the installation bracket 2. The material of the installation bracket can specifically be PP (polypropylene) material, and the material thickness is more than 1.5 mm.

[0055] Reference Figure 1As shown in the figure, a boss 2.3 is formed by protruding upward in the middle of the mounting bracket 2, so that an annular groove is formed on the upper side of the mounting bracket. The boss 2.3 of the mounting bracket is circular, and protruding blocks are arranged on both sides of the middle of the circle. Through holes 2.6 are arranged at the protruding blocks, and the rivet 4 realizes the riveting of the mounting bracket 2 and the instrument panel air duct 1 through the through holes 2.6. A notch 2.11 is arranged on one side of the mounting bracket 2, and a spacing distance is set between the notch 2.11 of the mounting bracket and the through hole on this side;

[0056] Reference Figure 1 As shown in the figure, a third limiting rib 2.7 and a fourth limiting rib 2.8 are respectively arranged at the protruding blocks of the mounting bracket 2. The third limiting rib 2.7 and the fourth limiting rib 2.8 are mainly limited by the outer contour. The third limiting rib is L-shaped, and the fourth limiting rib is also L-shaped. The included angle between the third limiting rib and the fourth limiting rib is greater than 90°. The height is flush with the first limiting rib 1.1 and the second limiting rib 1.2 at the concave end side of the instrument panel air duct. A notch is formed between the third limiting rib 2.7 and the fourth limiting rib 2.8. The fitting clearance between the third limiting rib 2.7 and the fourth limiting rib 2.8 and the first limiting rib and the second limiting rib is 0.1 mm. The third limiting rib 2.7 and the fourth limiting rib 2.8 play a role in reliable positioning and prevent over-positioning during assembly, causing interference.

[0057] It should be noted that an arrow indicating block 2.9 is arranged on the upper surface of the mounting bracket 2 to indicate the rotation direction of the negative ion emission head module, so as to give a prompt for correct installation, facilitate determining the direction during installation and prevent errors. The arrow indicating block protrudes from the upper surface of the mounting bracket, and can protrude 1 mm, which is convenient for observation and identification, and plays a role in increasing the product strength and controlling product deformation.

[0058] In addition, a guiding part 2.10 is arranged on the surface of the mounting bracket. The outer surface of the guiding part 2.10 is arranged along the outer surface of the boss 2.3. The guiding part 2.10 is connected to the stop groove 2.1. The guiding part 2.10 forms one side wall of the stop groove. A convex block 2.2 is arranged on the other side of the stop groove 2.1 to form the other side wall of the stop groove. The first convex part 3.1 can move along the guiding part 2.10 into the stop groove 2.1, and a spacing distance is set between the arrow indicating block 2.9 and the guiding part;

[0059] Specifically, the guiding part 2.10 includes an inclined plane section and a flat plane section. The inclined plane section is connected to the flat plane section. When the first convex part is installed, it first passes through the inclined plane section and then through the flat plane section. The flat plane section and the top side of the inclined plane section have the same height. The height of the flat plane section is lower than the height of the other side wall of the stop groove, that is, the height of the convex block. The angle between the inclined plane section and the mounting bracket is between 25° and 30°, and 28.5° can be selected. The width is more than 2.5 mm, which can not only play a good guiding role but also will not cause jamming. The setting of the guiding part guides the rotation of the negative ion emission head module and avoids incorrect installation directions of the negative ion emission head module.

[0060] It should be noted that the height of the stop groove 2.1 is greater than the height of the guiding portion 2.10, so as to effectively position the first convex portion through the stop groove. The overlapping amount between the stop groove 2.1 and the first convex portion 3.1 is greater than or equal to 3 mm to ensure the limitation of the first convex portion and prevent the first convex portion from rotating excessively and disengaging from the stop groove, resulting in functional failure. The unilateral gap between the first convex portion and the side wall of the stop groove is between 0.1 mm and 0.5 mm.

[0061] It is easy to understand that, referring to Figure 4 As shown, the negative ion emission head module 3 is provided with a protruding edge 3.2 and a second convex portion 3.3 arranged circumferentially. The protruding edge is an annular part, and the diameter of the protruding edge is greater than the width of the mounting hole. The second convex portion is located below the protruding edge. A limiting groove is formed between the protruding edge 3.2 and the second convex portion 3.3. The mounting bracket is in interference fit with the limiting groove, with an interference of 0.5 mm, to ensure firm installation and prevent easy shaking and falling off.

[0062] In this embodiment, the mounting hole 2.4 of the mounting bracket is a circular hole. The diameter of the protruding edge 3.2 is greater than the inner diameter of the mounting hole. There are two grooves 2.5 at the mounting hole, and the two grooves are arranged oppositely, and the widths of the grooves are different. The grooves 2.5 correspond to the second convex portions of the negative ion emission head module one by one. The size of the second convex portion 3.3 is adapted to the size of the groove, that is, the width of one groove on one side of the mounting hole is greater than the width of the other groove, and the width of one second convex portion 3.3 on the side of the negative ion emission head module is greater than the width of the other second convex portion. The second convex portion 3.3 can be an arc-shaped block, and the angle occupied by the second convex portion is less than 1 / 4 of the protruding edge. In this way, one end of the negative ion emission head module can be directly inserted into the groove, and the longer second convex portion is inserted into the wider groove, ensuring that the negative ion emission head module can be accurately installed and preventing misinstallation.

[0063] Specifically, the first convex portion 3.1 is L-shaped. The length of the first convex portion 3.1 is the same as the distance between the protruding edge of the negative ion emission head module and the outer side surface of the convex platform. The longer side of the first convex portion is connected to the middle section of the negative ion emission head module, that is, the protruding edge, and the shorter side of the first convex portion is arranged downward, so that the shorter side of the first convex portion can be limited by the side wall of the stop groove.

[0064] Moreover, it is easy to understand that the first convex portion 3.1 and the second convex portion 3.3 are arranged in a staggered manner. The first convex portion is usually located in the middle position between the two second convex portions on both sides. The stop groove 2.1 is located between two adjacent grooves, so as to realize the quick and accurate installation of the negative ion emission head module through the cooperation between the stop groove and the first convex portion, and prevent the first convex portion from running out through the groove on the other side during the rotation process.

[0065] In addition, it should be noted that, referring to Figure 5As shown in the figure, a wire harness bracket 1.3 is provided at the dashboard air duct. The wire harness bracket is a flat plate, and a spacing distance is set between the wire harness bracket 1.3 and the mounting bracket. The wire harness bracket 1.3 is provided with a bayonet, and the side of the bayonet is a rectangular opening, which is communicated with a circular opening. The width of the rectangular opening is smaller than the diameter of the circular opening. The wire harness 3.4 of the negative ion emitter head module is snapped into the bayonet of the wire harness bracket.

[0066] For the air duct structure provided in this embodiment, first install the mounting bracket on the dashboard air duct to avoid the direct installation of the negative ion emitter head module and the dashboard air duct. The mounting bracket serves as an intermediate structural member to ensure the installation strength of the negative ion emitter head module. The mounting bracket and the negative ion emitter head module can be snap-fitted, and through the cooperation of the first convex part and the positioning groove, the accurate installation of the negative ion emitter head module is guided, and excessive rotation is avoided, improving the assembly efficiency, effectively reducing the layout space of the negative ion emitter module. The setting of the guiding part effectively guides and prevents misalignment, improves the installation reliability, reduces the risk of functional failure, and overall realizes quick disassembly and assembly. The mounting bracket can be replaced to minimize the design changes of the product, reduce costs, and realize functions.

[0067] Embodiment 2

[0068] This embodiment provides an installation method for a negative ion emitter head module, which adopts the dashboard air duct structure described in Embodiment 1 and includes the following contents:

[0069] Manufacture the mounting bracket and the negative ion emitter head module;

[0070] Install the mounting bracket at the dashboard air duct, and paste a felt on the mounting surface of the mounting bracket, which can absorb assembly tolerances and reduce frictional noise at the same time;

[0071] Align the second convex part of the negative ion emitter head module with the groove at the mounting hole, press it vertically, and rotate the negative ion emitter head module relative to the mounting bracket along the direction indicated by the arrow indicating block so that the mounting bracket and the positioning groove of the negative ion emitter head module are snap-fitted, and the side part of the negative ion emitter head module gradually enters the positioning groove to limit the continuous rotation of the negative ion emitter head module.

[0072] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An instrument panel air duct structure, characterized in that: It includes an instrument panel air duct, a mounting bracket is arranged on the instrument panel air duct, the mounting bracket is fixedly connected to the instrument panel air duct, a stop groove is arranged on the surface of the mounting bracket, a mounting hole is arranged on the mounting bracket, at least one groove is arranged on the side of the mounting hole, a first convex portion is arranged on one side of the negative ion emission head module, one end of the negative ion emission head module enters the mounting hole and the groove, and after entering, the negative ion emission head module is rotated relative to the mounting bracket so that the mounting bracket and the negative ion emission head module are engaged and connected, and the first convex portion gradually enters the stop groove to limit the continued rotation of the negative ion emission head module.

2. The instrument panel air duct structure according to claim 1, characterized in that: The distance between the mounting bracket and the outlet of the instrument panel air duct is less than or equal to 400 mm, and the spacing between the mounting bracket and the peripheral parts is set; The mounting bracket is an injection molded part, and the wall thickness of the mounting bracket around the mounting hole is the same.

3. The instrument panel air duct structure according to claim 1, characterized in that: A guide portion is provided on the surface of the mounting bracket, the guide portion is connected to the stop groove, and the first protrusion can move along the guide portion into the stop groove; The guide portion comprises an inclined surface segment and a plane segment, and the inclined surface segment is connected to the plane segment.

4. The instrument panel air duct structure according to claim 3, characterized in that: The height of the stop groove is greater than the height of the guide portion, and the overlap between the stop groove and the first convex portion is greater than or equal to 3 mm to ensure the limiting of the first convex portion; The single-side gap between the first protrusion and the side wall of the stop groove is between 0.1 mm and 0.5 mm.

5. The instrument panel air duct structure according to claim 1, characterized in that: The first convex portion is L-shaped, a longer side of the first convex portion is connected to the middle section of the negative ion emission head module, and a shorter side of the first convex portion is arranged downward.

6. The instrument panel air duct structure according to claim 1, characterized in that: The negative ion emission head module is circumferentially provided with a protruding edge and a second convex portion, the diameter of the protruding edge is greater than the width of the mounting hole, the second convex portion is located below the protruding edge, a limiting groove is formed between the protruding edge and the second convex portion, and the mounting bracket is interference fit with the limiting groove.

7. The instrument panel air duct structure according to claim 6, characterized in that: The grooves at the mounting hole are provided at a plurality of locations, and the intervals between two adjacent grooves are set at a set angle, and the widths of the grooves are different. The grooves correspond to the second protrusions of the negative ion emission head module one by one, and the size of the second protrusions matches the size of the grooves; The first convex portion and the second convex portion are arranged in a staggered manner, and the stop groove is located between two adjacent grooves.

8. The instrument panel air duct structure according to claim 1, characterized in that: The middle part of the mounting bracket is protruding upward, through holes are respectively arranged on both sides of the mounting bracket, the mounting bracket is riveted to the instrument panel air duct, and a notch is arranged on one side of the mounting bracket; An arrow indicator block is provided on the surface of the mounting bracket to indicate the rotation direction of the negative ion emission head module.

9. The instrument panel air duct structure according to claim 1, characterized in that: The instrument panel air duct is provided with a concave portion, and limiting ribs are respectively provided on both sides of the concave portion, and the limiting ribs on both sides have different structures, and one end of one of the limiting ribs is inserted into the notch of the mounting bracket; A harness rack is arranged at the air duct of the instrument panel, the harness rack is spaced apart from the mounting bracket, a bayonet is arranged on the harness rack, and the harness of the negative ion emitter module is clamped into the bayonet of the harness rack.

10. A method for installing a negative ion emission head module, characterized in that: An instrument panel air duct structure according to any one of claims 1 to 9, comprising the following contents: Make mounting bracket and negative ion emitter module; Install the mounting bracket on the dashboard air duct; One end of the negative ion emission head module enters the mounting hole and the groove. After entering, the negative ion emission head module is rotated relative to the mounting bracket so that the mounting bracket is engaged and connected with the negative ion emission head module. The side of the negative ion emission head module gradually enters the stop groove to limit the continued rotation of the negative ion emission head module.

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