Wire harness sealing structure and electric heater

Abstract

This utility model discloses a wire harness sealing structure and an electric heater. The wire harness sealing structure includes a base, an elastic sealing plug, and an extruder. The base has an installation cavity, and the elastic sealing plug is installed in the installation cavity. By fitting against the side wall of the installation cavity, the gap between the elastic sealing plug and the base is sealed. The elastic sealing plug has a wire passage hole that passes through the elastic sealing plug. The wire harness can pass through the wire passage hole and exit the electric heater. The extruder compresses the elastic sealing plug, causing it to contract. The extruder compresses the elastic sealing plug, allowing the inner wall of the wire passage hole to fit well with the wire harness, effectively eliminating the gap between the wire harness and the wire passage hole. This effectively seals the gap between the wire harness and the inner wall of the wire passage hole without the need for adhesive application.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically to a wire harness sealing structure and an electric heater. Background Technology

[0002] The rapid development of new energy vehicles in China highlights the unique characteristics of these vehicles. Unlike traditional gasoline-powered cars, new energy vehicles lack engines, thus eliminating the need for waste heat to heat the entire vehicle. Furthermore, the battery pack requires heating to maintain optimal performance in low-temperature conditions. Positive Temperature Coefficient (PTC) thermistors, as a type of semiconductor ceramic material, generate heat when energized, offering advantages such as high heating efficiency, high power output, and no open flame. PTC electric heaters, manufactured from PTC thermistors, have become crucial components in new energy vehicles.

[0003] To ensure the safety of PTC electric heaters, the wiring harness of PTC electric heaters needs to be sealed by a sealing structure, which includes a sealing base, a sealing plug, and a sealing cover. First, the wiring harness is passed through the sealing plug, and then the sealing plug is fixed to the base, so that the sealing base, sealing plug, and wiring harness are assembled into a whole. Then, the sealing base is fixed to the housing with mounting screws, and finally the sealing cover is installed.

[0004] Because there is a gap between the sealing plug and the wire harness, before installing the sealing cover, it is necessary to seal the gap between the sealing plug and the wire harness by applying adhesive. After the adhesive dries, the sealing cover is then installed. Because the drying time is long, the assembly time is longer and there is a risk of adhesive overflow, which can easily contaminate the parts. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose a wire harness sealing structure and an electric heater, which solves the technical problems of the existing PTC electric heater wire harness sealing structure requiring glue dispensing, resulting in long assembly time and easy contamination of parts due to glue overflow.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, this utility model provides a wire harness sealing structure, comprising:

[0008] The substrate has an installation cavity.

[0009] A resilient sealing plug is installed in the mounting cavity and at least one end is abutted against the side wall of the mounting cavity. The resilient sealing plug has a wire passage hole that extends through the resilient sealing plug and is used for the passage of a wire harness.

[0010] An extrusion member is fixed to the substrate and abuts against the other end of the elastic sealing plug. The extrusion member is used to extrude the elastic sealing plug to provide extrusion force that seals the inner wall of the wire hole against the wire harness.

[0011] In some embodiments, the inner wall of the wire hole is provided with a sealing protrusion, which can seal and fit the wire harness.

[0012] In some embodiments, a plurality of sealing protrusions are provided, each of the sealing protrusions being spaced apart along the axial direction of the wire passage hole and extending toward the circumferential direction of the wire passage hole.

[0013] In some embodiments, the surface of the resilient sealing plug has a plurality of protective protrusions that fit against the sidewall of the mounting cavity.

[0014] In some embodiments, each of the protective protrusions extends toward the periphery of the resilient sealing plug.

[0015] In some embodiments, the side of the resilient sealing plug is abutted against the side wall of the mounting cavity, the resilient sealing plug includes a first extrusion end and a second extrusion end opposite to each other, the first extrusion end abuts against the bottom wall of the mounting cavity, the second extrusion end extends out of the mounting cavity, and the extruder extrudes the second extrusion end.

[0016] In some embodiments, the extrusion member includes a base and a cover plate. The base is fixedly connected to the base and extrudes the second extrusion end. The cover plate is fixed to the base and forms a wire cavity with the base. The wire cavity is used for the wire harness to pass through.

[0017] In some embodiments, the base is provided with a circumferentially extending fitting groove, and the cover plate has a fitting protrusion adapted to the fitting groove, the fitting protrusion fitting into the fitting groove.

[0018] In some embodiments, the base is further provided with a snap-fit ​​protrusion, and the cover plate has a snap-fit ​​ear, which snaps into the snap-fit ​​protrusion.

[0019] Secondly, this utility model also provides an electric heater, including the aforementioned wire harness sealing structure.

[0020] Compared with the prior art, the wire harness sealing structure provided by this utility model consists of a base, an elastic sealing plug, and an extruder. The base has an installation cavity, and the elastic sealing plug is installed in the installation cavity. By fitting against the side wall of the installation cavity, the gap between the elastic sealing plug and the base is sealed. The elastic sealing plug has a wire passage hole that passes through the elastic sealing plug, allowing the wire harness to pass through the wire passage hole and exit the electric heater. The extruder compresses the elastic sealing plug, causing it to shrink, thereby reducing the diameter of the wire passage hole. This allows the inner wall of the wire passage hole to better seal against the wire harness, effectively eliminating the gap between the wire harness and the wire passage hole, and achieving a seal between the wire harness and the inner wall of the wire passage hole. Therefore, by compressing the elastic sealing plug against the elastic sealing plug, the gap between the wire harness and the inner wall of the wire passage hole can be effectively sealed, thus eliminating the need for adhesive application to achieve a seal between the wire harness and the inner wall of the wire passage hole. This reduces the assembly time of the electric heater and avoids contamination of the electric heater with adhesive. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the wire harness sealing structure provided in this embodiment of the utility model;

[0022] Figure 2 It is along Figure 1 A magnified view of a section at point A in the middle;

[0023] Figure 3 This is an exploded view of the wire harness sealing structure provided in this embodiment of the utility model;

[0024] Figure 4 This is a front view of the wire harness sealing structure provided in this embodiment of the utility model;

[0025] Figure 5 It is along Figure 4 Sectional view along line AA in the middle.

[0026] Labels for each item in the figure:

[0027] 10—Base; 11—Mounting cavity; 20—Elastic sealing plug

[0028] 21—Wire passage hole; 22—First extrusion end; 23—Second extrusion end

[0029] 24—Protective protrusion; 30—Extruded part; 31—Base

[0030] 32—Cover plate; 33—Cavity; 211—Sealing protrusion

[0031] 311—Matching groove; 312—Matching protrusion; 321—Snap-fit ​​protrusion

[0032] 322—Connector 10a—Wire harness. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0034] To address the technical problems of existing PTC electric heater wiring harness sealing structures requiring adhesive dispensing, which leads to longer assembly times and easy contamination of parts due to adhesive overflow, this utility model provides a wiring harness sealing structure that can achieve sealing between the wiring harness and the wire hole without the need for adhesive dispensing, thereby reducing the assembly time of the PTC electric heater and preventing the PTC electric heater from being contaminated by adhesive.

[0035] It should be noted that the wire harness sealing structure described in this utility model is used in, but not limited to, PTC electric heaters. For ease of explanation, this utility model only uses the application of the wire harness sealing structure in a PTC electric heater as an example. The principle of the wire harness sealing structure in other types of equipment is essentially the same as that in the PTC electric heater, and will not be described in detail here.

[0036] The wire harness sealing structure of this utility model embodiment, such as Figure 1-3 As shown, the device includes a base 10, an elastic sealing plug 20, and an extruder 30. The base 10 has an installation cavity 11. The elastic sealing plug 20 is installed in the installation cavity 11 and fits against the side wall of the installation cavity 11. The elastic sealing plug 20 has a wire passage hole 21, which passes through the elastic sealing plug 20 for the wire harness 10a to pass through. The extruder 30 is fixed to the base 10 and abuts against the elastic sealing plug 20. The extruder 30 is used to compress the elastic sealing plug 20 to make the inner wall of the wire passage hole 21 seal against the wire harness 10a.

[0037] Specifically, the wire harness sealing structure comprises a base 10, an elastic sealing plug 20, and an extruder 30. The base 10 has an installation cavity 11, and the elastic sealing plug 20 is installed in the installation cavity 11. By fitting against the side wall of the installation cavity 11, the gap between the elastic sealing plug 20 and the base 10 is sealed. The elastic sealing plug 20 has a wire passage hole 21 through which the wire harness 10a passes through the electric heater. The extruder 30 compresses the elastic sealing plug 20. Under the condition that the volume of the installation cavity 11 remains unchanged and the two ends and the periphery of the elastic sealing plug 20 are compressed, the elastic sealing plug 20 contracts inward, thereby reducing the diameter of the wire passage hole 21. This allows the inner wall of the wire passage hole 21 to fit against the wire harness 10a. The surface of a is tightly fitted, effectively eliminating the gap between the wire harness 10a and the wire hole 21, thus sealing the gap between the wire harness 10a and the inner wall of the wire hole 21. Therefore, through the fit between the elastic sealing plug 20 and the side wall of the mounting cavity 11 and the compression of the extruder 30 against the extruder 30, the gap between the wire harness 10a and the inner wall of the wire hole 21 can be effectively sealed. In this way, the sealing between the wire harness 10a and the inner wall of the wire hole 21 can be achieved without the need for glue application, thereby reducing the assembly time of the electric heater and avoiding the electric heater being contaminated by glue. It can also ensure that the wire harness 10a and the inner wall of the wire hole 21 achieve a good sealing effect, avoiding the situation of poor sealing due to glue leakage when using glue application process.

[0038] Understandably, the substrate 10 can be any structural form capable of sealing and mounting the housing of the electric heater and providing the mounting cavity 11. By combining and mounting it with the housing of the electric heater, the final electric heater structure is formed. Alternatively, it can be directly set as the housing of the electric heater, which seals the wire harness 10a by cooperating with the elastic sealing plug 20 and the pressure member.

[0039] In this embodiment, as Figure 1 As shown, the substrate 10 forms the outer shell of the electric heater, and the elastic sealing plug 20 and the extrusion member 30 are installed in the outer shell to seal the electric heater wiring harness 10a passing through the outer shell.

[0040] Understandably, the mounting cavity 11 can be any type of cavity structure, such as a cylindrical cavity or a square cavity, and its shape is adapted to the shape of the elastic sealing plug 20.

[0041] Understandably, the elastic sealing plug 20 can be made of materials such as rubber, polytetrafluoroethylene, or polyurethane, with rubber being the preferred material.

[0042] Understandably, the side of the elastic sealing plug 20 can be any type of structural surface, such as a plane or an arc, as long as it can fit against the side wall of the mounting cavity 11.

[0043] Understandably, the extruder can extrude any part of the elastic sealing plug 20, such as the end or side, as long as it can cause the wire hole 21 to shrink and seal against the wire harness.

[0044] In one embodiment, the side of the elastic sealing plug 20 is abutted against the sidewall of the mounting cavity 11. The elastic sealing plug 20 includes a first pressing end 22 and a second pressing end 23, which abut against the bottom wall of the mounting cavity 11. The second pressing end 23 extends out of the mounting cavity 11, and the pressing member 30 presses against the second pressing end 23. Specifically, when the side of the elastic sealing plug 20 is abutted against the sidewall of the mounting cavity 11, the bottom wall of the mounting cavity 11 and the pressing member 30 respectively press against the first pressing end 22 and the second pressing end 23, thereby sealing the wire hole 21 with the wire harness 10a.

[0045] In this embodiment, the wire hole 21 passes through the first extrusion end 22 and the second extrusion end 23.

[0046] In one embodiment, such as Figure 3-5 As shown, the surface of the elastic sealing plug 20 has several protective protrusions 24, which can seal and adhere to the wire harness 10a. Specifically, the surface of the elastic sealing plug 20 can be fitted to the side wall of the mounting cavity 11 through the provided protective protrusions 24. While achieving the fit with the side wall of the mounting cavity 11, the side of the elastic sealing plug 20 can be spaced from the side wall of the mounting cavity 11. Therefore, the elastic sealing plug 20 can be slightly deformed towards the side wall of the mounting cavity 11 under the pressure of the extruder 30, thereby improving the fault tolerance of the elastic sealing plug 20 and preventing the elastic sealing plug 20 from breaking under pressure.

[0047] Understandably, the protective protrusion 24 can extend in any form, such as radially or obliquely, toward the elastic sealing plug 20.

[0048] In one embodiment, such as Figure 3-5 As shown, each protective protrusion 24 extends toward the periphery of the elastic sealing plug 20. Specifically, by extending toward the periphery of the elastic sealing plug 20, the protective protrusion 24 can enclose the periphery of the elastic sealing plug 20, and then, by fitting against the side wall of the mounting cavity 11, can seal the gap between the elastic sealing plug 20 and the side wall of the mounting cavity 11, preventing external impurities from entering the electric heater.

[0049] In this embodiment, the number of wire holes 21 can be adaptively set according to the number of wire harnesses 10a, and this embodiment does not make a specific limitation.

[0050] In one embodiment, such as Figure 5As shown, the inner wall of the wire passage hole 21 is provided with a sealing protrusion 211. The sealing protrusion 211 is pressed against the wire harness 10a by the elastic sealing plug 20. Specifically, the side wall of the wire passage hole 21 can be pressed against the surface of the wire harness 10a by the sealing protrusion 211, thereby achieving a seal between the wire harness 10a and the side wall of the wire passage hole 21. The seal formed by the sealing protrusion 211 and the wire harness 10a ensures the sealing quality.

[0051] Understandably, the sealing protrusion 211 can extend in the axial direction, circumferential direction, or other directions of the inner wall of the wire hole 21.

[0052] In one embodiment, such as Figure 5 As shown, a plurality of sealing protrusions 211 are provided, each sealing protrusion 211 being spaced apart along the axial direction of the wire passage hole 21 and extending toward the circumference of the wire passage hole 21. Specifically, the sealing protrusions 211, through the above-described arrangement, form annular protrusions spaced apart along the axial direction of the wire passage hole 21. Each sealing protrusion 211 is compressed against the wire harness 10a under the compression of the extruder 30, thereby ensuring the seal between the wire harness 10a and the elastic sealing plug 20.

[0053] Understandably, the extruder 30 can extend into the mounting cavity 11 to extrude the second extrusion end 23, or the second extrusion end 23 can protrude from the mounting cavity 11, so that the extruder 30 extrudes the second extrusion end 23 outside the mounting cavity 11.

[0054] In one embodiment, such as Figure 5 As shown, the second extrusion end 23 extends out of the mounting cavity 11. Specifically, by extending out of the mounting cavity 11, the second extrusion end 23 allows the extruder 30 to extrude the second extrusion end 23 from the outside of the mounting cavity 11. Therefore, the extruder 30 only needs to extrude the second extrusion end 23 through a planar structure, which facilitates the forming of the extruder 30. At the same time, it can maximize the contact area between the extruder 30 and the second extrusion end 23, so that the second extrusion end 23 is subjected to uniform force.

[0055] Understandably, the extrusion component 30 can be any structure, such as a plate or cylinder, that can extrude the second extrusion end 23. It can be fixed to the base 10 through connection with the base 10 by means of threaded connection, snap-fit, or other connection methods.

[0056] In one embodiment, such as Figure 1-5As shown, the extrusion member 30 includes a base 31 and a cover plate 32. The base 31 is fixedly connected to the base 10 and extrudes the second extrusion end 23. The cover plate 32 is fixed to the base 31 and forms a wire cavity 33 with the base 31. The wire cavity 33 is used for the wire harness 10a to pass through. Specifically, the base 31 can connect the extrusion member 30 to the base 10 and can extrude the second extrusion end 23. The cover plate 32, by covering the base 31, can form a sealed wire cavity 33 with the base 31. The wire harness 10a, which passes through the wire hole 21, can enter the wire cavity 33 and then exit from the wire cavity 33. The wire cavity 33 can provide external protection for the wire harness 10a to prevent the wire harness 10a from breaking. At the same time, it can improve the seal between the wire harness 10a and the base 10.

[0057] In this embodiment, the base 31 is fixed to the base 10 by screws. By adjusting the tightening force of the screws, the compressive force exerted by the base 31 on the second compressive end 23 can be adjusted.

[0058] In one embodiment, such as Figure 1-5 As shown, the base 31 is provided with a peripherally extending fitting groove 311, and the cover plate 32 has a fitting protrusion 312 adapted to the fitting groove 311, which fits into the fitting groove 311. Specifically, by fitting the fitting protrusion 312 into the fitting groove 311, the gap between the cover plate 32 and the base 31 can be sealed, thereby providing better protection for the wire harness 10a and the electric heater.

[0059] In some embodiments, such as Figure 1-5 As shown, the base 31 is also provided with a snap-fit ​​protrusion 321, and the cover plate 32 has a snap-fit ​​ear 322, which snaps into the snap-fit ​​protrusion 321. Specifically, when connecting the cover plate 32 and the base 31, it is only necessary to snap the snap-fit ​​ear 322 into the snap-fit ​​protrusion 321, which facilitates the assembly of the cover plate 32.

[0060] This utility model embodiment also provides an electric heater, including a wire harness sealing structure. Specifically, by setting this wire harness sealing structure, the electric heater can effectively seal the gap between the wire harness 10a and the inner wall of the wire passage hole 21, achieving a seal between the wire harness 10a and the inner wall of the wire passage hole 21 without the need for adhesive application. This reduces the assembly time of the electric heater and avoids contamination of the electric heater with adhesive. It also ensures a good sealing effect between the wire harness 10a and the inner wall of the wire passage hole 21, avoiding the situation where poor sealing occurs due to adhesive leakage during the adhesive application process.

[0061] In this embodiment, when assembling the sealing structure of the electric heater, each wire harness 10a is first passed through the wire hole 21, and then the cover plate 32 is placed on top, so that the cover plate 32 and the base 31 are engaged, forming an enclosure for the wire harness 10a passing through the wire hole 21. Then, the elastic sealing plug 20 is installed in the mounting hole, and then the base 31 is fixed to the base with screws, thus completing the assembly of the sealing structure. This assembly process is simple, efficient, pollution-free, and can ensure a good seal between the wire harness 10a and the elastic sealing plug 20.

[0062] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A wire harness sealing structure, characterized in that, include: The substrate has an installation cavity. A resilient sealing plug is installed in the mounting cavity and at least one end is abutted against the side wall of the mounting cavity. The resilient sealing plug has a wire passage hole that extends through the resilient sealing plug and is used for the passage of a wire harness. An extrusion member is fixed to the substrate and abuts against the other end of the elastic sealing plug. The extrusion member is used to extrude the elastic sealing plug to provide extrusion force that seals the inner wall of the wire hole against the wire harness.

2. The wire harness sealing structure according to claim 1, characterized in that, The inner wall of the wire passage hole is provided with a sealing protrusion, which can seal and fit the wire harness.

3. The wire harness sealing structure according to claim 2, characterized in that, The sealing protrusions are provided in a plurality of manner, and each sealing protrusion is spaced apart along the axial direction of the wire hole and extends toward the circumference of the wire hole.

4. The wire harness sealing structure according to claim 1, characterized in that, The surface of the elastic sealing plug has several protective protrusions, which fit against the side wall of the mounting cavity.

5. The wire harness sealing structure according to claim 4, characterized in that, Each of the protective protrusions extends toward the periphery of the elastic sealing plug.

6. The wire harness sealing structure according to any one of claims 1-5, characterized in that, The side of the elastic sealing plug is in contact with the side wall of the mounting cavity. The elastic sealing plug includes a first extrusion end and a second extrusion end opposite to each other. The first extrusion end abuts against the bottom wall of the mounting cavity, and the second extrusion end extends out of the mounting cavity. The extruder extrudes the second extrusion end.

7. The wire harness sealing structure according to claim 6, characterized in that, The extrusion member includes a base and a cover plate. The base is fixedly connected to the base and extrudes the second extrusion end. The cover plate is fixed to the base and forms a wire cavity with the base. The wire cavity is used for the wire harness to pass through.

8. The wire harness sealing structure according to claim 7, characterized in that, The base is provided with a circumferentially extending fitting groove, and the cover plate has a fitting protrusion adapted to the fitting groove, the fitting protrusion fitting into the fitting groove.

9. The wire harness sealing structure according to claim 7, characterized in that, The base is also provided with a snap-fit ​​protrusion, and the cover plate has a snap-fit ​​ear, which snaps into the snap-fit ​​protrusion.

10. An electric heater, characterized in that, Includes the wire harness sealing structure as described in any one of claims 1-9.

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