PTC heater shell structure and PTC heater

Abstract

The utility model relates to a PTC heater housing structure and a PTC heater, the PTC heater housing structure comprises a bottom housing structure and a cover body structure, the bottom housing structure defines a mounting groove used for accommodating a heating core body and a wiring groove used for accommodating a wiring harness and a connection interface; the wiring groove body is provided with a receding channel used for enabling a connection interface to extend into the wiring groove from the installation groove. The cover body structure comprises a first cover body which detachably covers the opening of the mounting groove, and a second cover body which detachably covers the opening of the wiring groove. According to the scheme, in the glue filling process, glue filling can be conducted by disassembling the second cover body, the whole glue filling opening is the opening of the wiring groove, the speed of filling can be increased, a good glue filling visual field is achieved, the glue filling situation can be directly observed, the situation of excessive glue filling is prevented, and glue supplementing operation can be directly conducted on the area where glue filling is insufficient.

Description

Technical Field

[0001] The utility model relates to the technical field of heating equipment, in particular to a PTC heater shell structure and a PTC heater. Background Art

[0002] Unlike traditional fuel vehicles, new energy vehicles require independent heaters for battery panel heating, air conditioning and heating systems, etc. PTC, as a positive temperature coefficient semiconductor material, is an ideal material for automotive heating devices.

[0003] During the manufacturing process of PTC heaters, sealant needs to be poured into the busbar circuit area inside the shell to achieve waterproof and insulating effects. Currently, the following problems exist in the glue pouring process of PTC heaters: the glue is poured through the hole, the glue pouring speed is slow and bubbles are easily generated, and the field of vision in the glue pouring area is not obvious, which cannot ensure that the busbar circuit area is completely filled with sealant, and there is a situation where excessive glue pouring causes the sealant to flow to the heating core position. Utility Model Content

[0004] The main purpose of the utility model is to provide a PTC heater housing structure and a PTC heater, aiming to solve the problem that when the existing PTC heater is filled with sealant into the busbar circuit area, the speed is slow and the field of view of the filling area is not obvious.

[0005] To achieve the above-mentioned purpose, the utility model proposes a PTC heater shell structure, including a bottom shell structure and a cover body structure, the bottom shell structure is defined to form a mounting groove for accommodating a heating core and a wiring groove for accommodating a wiring harness and a connection interface, the wiring groove body is provided with a makeshift channel for the connection interface to extend from the mounting groove into the wiring groove; the cover body structure includes a first cover body detachably covered on the notch of the mounting groove, and a second cover body detachably covered on the notch of the wiring groove.

[0006] According to some embodiments of the utility model, an isolation portion is protruding from the bottom of the wiring slot, and the isolation portion and part of the slot wall of the wiring slot together form a glue potting slot for accommodating a connection interface and part of the wiring harness, and the isolation portion and the rest of the slot wall of the wiring slot constitute a harness slot for accommodating the rest of the wiring harness.

[0007] According to some embodiments of the present invention, the isolation portion and the bottom shell structure are integrally injection molded.

[0008] According to some embodiments of the utility model, a wire hole communicating with the glue potting groove and the wiring harness groove is formed on the isolation portion, and a wire protection tube is provided on the wire hole.

[0009] According to some embodiments of the present utility model, a reinforcing rib connected to the isolation portion is provided in the wiring harness groove.

[0010] According to some embodiments of the utility model, a slot for fixing a wiring harness is formed on the reinforcing rib.

[0011] According to some embodiments of the present invention, the first cover body and / or the second cover body are detachably connected to the bottom shell structure via a snap-fit ​​positioning structure.

[0012] According to some embodiments of the utility model, the snap-fit ​​positioning structure includes a plurality of snap-fit ​​protrusions provided on the first cover body and / or the second cover body, and a plurality of snap-fit ​​grooves provided on the bottom shell structure corresponding one-to-one to the snap-fit ​​protrusions. The first cover body and / or the second cover body is detachably connected to the bottom shell structure through the snap-fit ​​cooperation between the snap-fit ​​protrusions and the snap-fit ​​grooves.

[0013] According to some embodiments of the utility model, a wire protection structure is provided on the bottom shell structure, and the wire protection structure has a wire passing hole, and the wire passing hole communicates with the wiring slot and the external space of the bottom shell structure.

[0014] The utility model also proposes a PTC heater, including a heating core, a wiring harness and the above-mentioned heater shell structure, the heating core includes a main body and a connection interface connected to the main body, the main body is installed in the installation groove, the connection interface passes through the make way channel and is accommodated in the wiring groove, the wiring harness is accommodated in the wiring groove and is electrically connected to the connection interface, and the wiring groove is filled with sealant.

[0015] The utility model has at least the following beneficial effects:

[0016] The existing PTC heater shell generally accommodates the heating core, the connection interface and the wiring harness in the same cavity, which requires the cavity in the shell to be glued as a whole. In the utility model, by dividing the PTC heater shell structure into an installation groove for accommodating the heating core and a wiring groove for accommodating the wiring harness and the connection interface, the wiring harness and the connection interface can be separated and glued separately. Therefore, it is only necessary to glue the wiring groove to meet the safety requirements of waterproof insulation. In addition, during the glue pouring process, the second cover can be removed and the area in the wiring groove that needs glue pouring can be directly glued. Compared with the existing hole-type glue pouring method, the diameter of the glue pouring port is larger, which can increase the glue pouring speed to avoid the generation of bubbles. It also has a good glue pouring field of view, can directly observe the glue pouring situation in the groove, prevent excessive glue pouring, and can directly perform glue filling operations on the insufficient glue pouring area. After the glue pouring is completed, the second cover can be closed to seal it.

[0017] In addition, it is worth mentioning that the cover structure is divided into two parts. After the first cover is first covered on the installation groove, the heating core can be fixed and then potted. This facilitates positioning its connection interface to a specified position, and there is no longer a need for a pressing tool to press and fix the heating core. Moreover, the first cover can also play a sealing role to prevent excessive potting glue in the wiring groove from flowing into the installation groove during the potting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 FIG. is a schematic structural diagram of a PTC heater housing structure provided by an embodiment of the present invention;

[0020] Figure 2 is Figure 1 a schematic structural diagram of the PTC heater housing structure (removing the first cover) in

[0021] DESCRIPTION OF THE REFERENCE NUMERALS

[0022] 100 - PTC heater housing structure; 1 - bottom shell structure; 11 - installation groove; 12 - wiring groove; 121 - potting groove; 122 - wire harness groove; 2 - cover structure; 21 - first cover; 22 - second cover; 3 - isolation part; 4 - wire protection tube; 5 - reinforcing rib; 6 - engaging and positioning structure; 61 - engaging convex part; 62 - engaging groove part; 7 - wire protection structure; 200 - PTC heater; 110 - heating core; 120 - body; 130 - connection interface; 140 - wiring harness; 150 - potting area. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0024] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0025] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0026] The present utility model provides a PTC heater housing structure. Figure 1 - Figure 2 This is a specific embodiment of a PTC heater housing structure provided by the present utility model.

[0027] As Figure 1 and Figure 2 , an embodiment of the present utility model provides a PTC heater housing structure 100, which includes a bottom shell structure 1 and a cover body structure 2. The bottom shell structure 1 is defined to form an installation groove 11 for accommodating a heating core 110 and a wiring groove 12 for accommodating a wiring harness. A relief channel for a connection interface 130 of the heating core 110 extending from the installation groove 11 into the wiring groove 12 is communicated between the installation groove 11 and the wiring groove 12. The cover body structure 2 includes a first cover body 21 detachably covering the notch of the installation groove 11, and a second cover body 22 detachably covering the notch of the wiring groove 12.

[0028] In the existing PTC heater housing structure 100, generally, the heating core 110, the connection interface 130, and the wiring harness 140 are accommodated in the same cavity, resulting in the need to perform overall potting on the cavity inside the housing. In the present utility model, by separately providing an installation groove 11 for accommodating the heating core 110 and a wiring groove 12 for accommodating the wiring harness 140 and the connection interface 130 on the PTC heater housing structure 100, the wiring harness 140 and the connection interface 130 can be separated and potted individually. Therefore, only potting the wiring groove 12 can meet the safety requirements of waterproofing and insulation. Moreover, during the potting process, the second cover 22 can be removed, and the area that needs to be potted in the wiring groove 12 can be directly potted. Compared with the existing hole-type potting method, the diameter of the potting port is larger, which can improve the potting speed to avoid generating air bubbles, and has a good potting vision, enabling direct observation of the potting situation in the groove, preventing over-potting, and enabling direct patching of the under-potted area. After potting is completed, it can be sealed by covering with the second cover 22. In addition, it is worth mentioning that the cover structure 2 is divided into two parts. The first cover 21 can be first covered on the installation groove 11, and after fixing the heating core 110, potting can be carried out, which is convenient for positioning its connection interface 130 to the specified position. There is no longer a need for a pressing tool to press and fix the heating core 110. Moreover, the first cover 21 can also play a sealing role to prevent the sealing glue in the wiring groove 12 from flowing into the installation groove 11 during the potting process due to excessive potting.

[0029] It can be understood that during the potting process of the housing structure provided by the present utility model, only the second cover 22 needs to be removed to expose the wiring groove 12 for potting. Therefore, the second cover 22 is a fully solid structure and does not need to be provided with a potting hole.

[0030] Specifically, it should be noted that in the actual production process, the wiring harness 140 is generally covered with an insulating waterproof layer on the outside, and the connection interface 130 of the heating core 110 is generally an electrode plate or an electrode column, and there is still a part exposed in the groove after being crimped with the wiring harness 140. Therefore, only potting and sealing the connection interface 130 and the connection part between the connection interface 130 and the wiring harness 140 can meet the safety requirements. Please refer to Figure 2In some embodiments, an isolation portion 3 is convexly provided on the bottom of the wiring groove 12, and the isolation portion 3 and part of the groove wall of the wiring groove 12 are combined to form the glue pouring groove 121 for accommodating the connection interface 130 and part of the wiring harness 140, and the isolation portion 3 and the remaining groove wall of the wiring groove 12 constitute the harness groove 122 for accommodating the remaining wiring harness 140. In this way, the connection interface 130 will be accommodated in the glue pouring groove 121 after passing through the make way channel and will be electrically connected to the part of the wiring harness 140 in the glue pouring groove. In the glue pouring process, it is only necessary to pour sealant into the glue pouring groove 121, which reduces the glue pouring cost. It should be noted that the part of the wiring harness 140 accommodated in the glue pouring groove is a power harness electrically connected to the connection interface, and the remaining wiring harness 140 is a control harness connected to other control units in the shell.

[0031] Please refer to Figure 1 , the glue injection area 150 is located in the glue injection groove 121, and Figure 1 The glue-filling area 150 is already filled with sealant. It is understandable that the present invention does not impose any specific limitation on the isolation portion 3 , which may be a protruding partition, a partition rib, or the like.

[0032] Furthermore, in some embodiments, the isolation portion 3 and the bottom shell structure 1 are integrally injection molded, which can increase assembly efficiency, reduce the use of shell structural parts, and reduce costs.

[0033] Specifically, in the wiring harness 140, the wiring harness used to connect to the connection interface 130 needs to enter the glue potting groove 121 from the wiring harness groove 122 to be electrically connected to the connection interface. In some embodiments, a wire hole connecting the glue potting groove 121 and the wiring harness groove 122 is formed on the isolation portion 3, and a wire protection tube 4 is provided on the wire hole. The wire protection tube 4 can provide protection for the wiring harness 140 when passing through the wire hole to avoid friction with the hole wall and wear of the insulating waterproof layer on the wiring harness.

[0034] Specifically, in order to improve the deformation resistance of the isolation portion 3, in some embodiments, a reinforcing rib 5 connected to the isolation portion 3 is provided in the wiring harness groove 122. Preferably, the reinforcing rib 5 is injection molded together with the bottom shell structure 1.

[0035] Furthermore, in some embodiments, the reinforcing ribs 5 are provided in plurality and are spaced apart in the harness groove 122 .

[0036] It should be noted that there are multiple wiring harnesses. To prevent each control wiring harness from moving along with the PTC heater 200 as the new energy vehicle travels, in some embodiments, a card slot for fixing the wiring harness is formed on the reinforcing rib. In this way, the wiring harness 140 located in the wiring harness slot can be fixed in the card slot respectively. In addition, since there are multiple reinforcing ribs 5, the positions of the card slots can be determined by defining the specific positions of the reinforcing ribs 5, thereby providing an installation guiding function for the wiring harness 140.

[0037] Specifically, there is no limitation on the connection method between the cover body structure 2 and the bottom shell structure 1, as long as it is ensured that the first cover body 21 and the second cover body 22 are detachably connected to the bottom shell structure 1. In some embodiments, the first cover body 21 and the second cover body 22 are detachably connected to the bottom shell structure 1 through the snap - fit positioning structure 6. Through the snap - fit positioning structure 6, the quick disassembly and assembly of the two cover bodies can be realized, which is convenient for improving the efficiency of the potting process.

[0038] Further, in some embodiments, the snap - fit positioning structure 6 includes a plurality of snap - fit protrusions 61 provided on the first cover body 21 and / or the second cover body 22, and a plurality of snap - fit groove portions 62 provided on the bottom shell structure and corresponding to the snap - fit protrusions 61 one by one. The first cover body 21 and / or the second cover body 22 are detachably connected to the bottom shell structure 1 through the snap - fit cooperation between the snap - fit protrusions 61 and the snap - fit groove portions 62. In this way, the detachable connection between the two cover bodies and the bottom shell structure 1 can be realized through the snap - fit cooperation between the snap - fit protrusions 61 and the snap - fit groove portions 62, with simple operation and quick disassembly and assembly.

[0039] Specifically, in order to electrically connect multiple wiring harnesses 140 to the outside of the housing structure, in some embodiments, a wire protection structure 7 is provided on the bottom shell structure 1. The wire protection structure 7 has a wire passing hole, and the wire passing hole communicates the wiring groove 12 and the external space of the bottom shell structure 1. In this way, the wiring harness 140 can pass through the wire passing hole and extend out of the housing structure to be connected to other components. The wire protection structure 7 can play a role in sealing and protecting the wiring located inside it. It should be noted that the wire protection structure 7 includes but is not limited to a wire protection tube 4, a wire protection coil, a wire protection rubber plug, etc.

[0040] The utility model also provides a PTC heater 200, including a heating core 110, a wiring harness 140 and the above-mentioned PTC heater shell structure 100, the heating core 110 includes a main body 120 and a connection interface 130 connected to the main body 120, the main body 120 is installed in the installation groove 11, the connection interface 130 passes through the make way channel and is accommodated in the wiring groove 12, the wiring harness 140 is accommodated in the wiring groove 12 and is electrically connected to the connection interface 130, so that according to safety requirements, a specific area in the wiring groove can be selected to perform a glue filling process to achieve the safety requirements for waterproof insulation of the convergence circuit area, improve the safety performance, and thus extend the service life of the PTC heater 200.

[0041] It should be noted that the cover structure 2 and the bottom shell structure 1 can also be fixed by screw connection, or by using other connection structures known to those skilled in the art. Multiple connection methods can be set one by one or in combination.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A PTC heater housing structure, characterized in that: include: A bottom shell structure, which defines a mounting groove for accommodating a heating core and a wiring groove for accommodating a wiring harness and a connection interface, wherein the wiring groove body is provided with a clearance passage for the connection interface to extend from the mounting groove into the wiring groove; and, The cover structure comprises a first cover detachably covering the notch of the installation slot and a second cover detachably covering the notch of the wiring slot.

2. The PTC heater housing structure according to claim 1, characterized in that: An isolation portion is convexly provided at the bottom of the wiring slot, and the isolation portion and part of the slot wall of the wiring slot are combined to form a glue potting slot for accommodating a connection interface and part of the wiring harness, and the isolation portion and the remaining slot wall of the wiring slot constitute a harness slot for accommodating the remaining wiring harness.

3. The PTC heater housing structure according to claim 2, characterized in that: The isolation portion and the bottom shell structure are integrally injection-molded.

4. The PTC heater housing structure according to claim 2, characterized in that: A wire hole communicating with the glue potting groove and the wiring harness groove is formed on the isolation portion, and a wire protection tube is provided on the wire hole.

5. The PTC heater housing structure according to claim 2, characterized in that: A reinforcing rib connected to the isolation portion is provided in the harness groove.

6. The PTC heater housing structure according to claim 5, characterized in that: A clamping groove for fixing the wiring harness is formed on the reinforcing rib.

7. The PTC heater housing structure according to claim 1, characterized in that: The first cover body and / or the second cover body are detachably connected to the bottom shell structure via a snap-fit ​​positioning structure.

8. The PTC heater housing structure according to claim 7, characterized in that: The snap-fit ​​positioning structure includes a plurality of snap-fit ​​protrusions provided on the first cover body and / or the second cover body, and a plurality of snap-fit ​​grooves provided on the bottom shell structure corresponding one-to-one to the snap-fit ​​protrusions. The first cover body and / or the second cover body are detachably connected to the bottom shell structure through the snap-fit ​​cooperation between the snap-fit ​​protrusions and the snap-fit ​​grooves.

9. The PTC heater housing structure according to claim 1, characterized in that: The bottom shell structure is provided with a wire protection structure, and the wire protection structure has a wire through hole, and the wire through hole communicates with the wiring slot and the external space of the bottom shell structure.

10. A PTC heater, characterized in that: It comprises a heating core, a wiring harness and a PTC heater shell structure as described in any one of claims 1 to 9, wherein the heating core comprises a main body and a connection interface connected to the main body, the main body is installed in the installation groove, the connection interface passes through the make way channel and is accommodated in the wiring groove, and the wiring harness is accommodated in the wiring groove and is electrically connected to the connection interface.

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