CN116867129B

CN116867129B - Waterproof structure for PTC heater

Info

Publication number: CN116867129B
Application number: CN202311118537.3A
Authority: CN
Inventors: 闻俊涛; 吴翔; 鄂新刚
Original assignee: SHENZHEN SHARING ELECTRONICS CO Ltd
Current assignee: SHENZHEN SHARING ELECTRONICS CO Ltd
Priority date: 2023-09-01
Filing date: 2023-09-01
Publication date: 2023-11-17
Anticipated expiration: 2043-09-01
Also published as: CN116867129A

Abstract

The invention relates to the technical field of waterproof structures, and provides a waterproof structure for a PTC heater, which covers a specific waterproof structure matched with the PTC heater, can realize the waterproof of the PTC heater while ensuring heat conduction, and in the relative installation process of the PTC heater, four hooking connecting rods can realize synchronous driving, a protective installation assembly is convenient and labor-saving relative to the installation and disassembly operation of a base, and comprises the base and a plurality of automobile PTC heaters.

Description

Waterproof structure for PTC heater

Technical Field

The invention relates to the technical field of waterproof structures, in particular to a waterproof structure for a PTC heater.

Background

The principle of the PTC heater is that the resistance value is raised into a jump zone by self-heating temperature rise after the PTC heating plate is powered up, the surface temperature of the PTC heating plate is kept constant, the temperature is only related to the Curie temperature and the external voltage of the PTC heating plate and is basically irrelevant to the ambient temperature, the PTC ceramic heating element used in the refrigerating device is formed by combining a plurality of single sheets in parallel and bonding the single sheets with corrugated aluminum strips at high temperature, and in order to realize the protection of the single sheets of the PTC heaters after the parallel combination, a waterproof structure is generally required to be arranged to form necessary protection.

Through searching, the invention patent of No. CN217124481U, published by No. 5/8 of 2022, discloses an automobile PTC heater with a waterproof structure, which is roughly described as comprising a base, wherein a mounting groove is formed in the middle position inside the base, an automobile PTC module which plays a role in protecting the automobile PTC heater is inserted and connected inside the mounting groove, the automobile PTC module comprises a shell, the automobile PTC heater is placed inside the shell, the automobile PTC module comprises two mounting plates which are arranged oppositely and fixedly arranged at two sides of the outer surface of the shell, first clamping rods in the axial direction are fixedly arranged at two sides of the lower end surface of the mounting plate, a first movable groove which is positioned at the side of the mounting groove is formed inside the base, a first connecting groove which is positioned at the outer side of the first clamping rods and communicated with the first movable groove is formed in the base, the size of the first connecting groove is matched with the first clamping rods, the first clamping rod is in sliding connection with the base through the first connecting groove, a limiting piece which has a limiting effect on the first clamping rod is arranged in the first movable groove, when the automobile PTC module is used, a power supply is connected, a switch is turned on, a user can place the automobile PTC heater inside the mounting groove, then the automobile PTC module comprises a shell which is sleeved outside the automobile PTC heater and is tightly inserted and connected with the mounting groove, the mounting plate is positioned on the upper end face of the base, simultaneously, the first clamping rod can be driven to extend to the inside of the first movable groove through the first connecting groove by the downward movement of the mounting plate, the second clamping rod can be driven to slide in a direction far away from the first clamping rod when the first clamping rod is contacted with the second clamping rod, at the moment, the first spring is compressed, when the clamping position of the first clamping rod is positioned below the clamping position of the second clamping rod, the first spring is rebounded, the second clamping rod is driven to be tightly connected with the first clamping rod, and the mounting plate can be driven to be fixedly connected with the base, thus can make car PTC module include casing and base fixed connection, can play the guard action to car PTC heater, when car PTC module includes the casing in order to overhaul the cleanness to car PTC heater needs, the user can be in the inside of second spread groove manual pressing spliced pole downwards, the downmovement of spliced pole can drive the downmovement of the fixed plate with spliced pole fixed connection, at this moment the second spring is stretched, fixed plate and reference column sliding connection, the downmovement of fixed plate can drive the rotation of gag lever post simultaneously, the rotation of gag lever post can drive the slip with gag lever post swing joint's connecting rod, the connecting rod slides in the horizontal direction can drive the removal of the fixed block with connecting rod fixed connection, the removal of fixed block can drive the removal of second draw-in lever, when the second draw-in lever moves to the direction of keeping away from first draw-in lever and when disconnection with first draw-in lever, the user can grasp the mounting panel and manually upwards move the mounting panel, when first spread groove and car PTC module include casing and base disconnection, the user can overhaul and change car PTC heater.

Although the above-mentioned prior art scheme can realize the installation and dismantlement of PTC heater, but combine the holistic attached drawings of scheme, we can find that the setting of mounting panel is a plurality of to the spliced pole in a plurality of mounting panels is independent each other, consequently for need press the drive respectively to a plurality of spliced poles when dismantling the operation, the operation is to be further simplified and is under the unable synchronous state of pressing down of a plurality of spliced poles, the dismantlement feasibility of casing is lower, and how to carry out waterproof to the car PTC heater in the casing also does not specifically set forth.

Disclosure of Invention

(one) solving the technical problems

Aiming at the defects of the prior art, the invention provides a waterproof structure for a PTC heater, which covers a specific waterproof structure matched with the PTC heater, ensures heat conduction and can realize the waterproof of the PTC heater, and in the relative installation process of the PTC heater, four hooking connecting rods can realize synchronous driving, so that the installation and the disassembly operations of a protective installation assembly relative to a base are convenient and labor-saving.

(II) technical scheme

In order to achieve the above purpose, the present invention provides the following technical solutions: the waterproof structure for the PTC heater comprises a base, a plurality of automobile PTC heaters, a protective mounting assembly and a connecting assembly, wherein the protective mounting assembly comprises an outer cover and an inner shell, a plurality of automobile PTC heaters are fixedly connected in the inner shell, the outer cover covers the outside of the inner shell, a spacing cavity is arranged between the inner shell and the outer cover, a plurality of inner openings are formed in the inner shell, a plurality of conducting sheets are arranged in the inner shell and extend out of the inner shell through a plurality of inner openings respectively, a plurality of outer openings are formed in the outer cover, a plurality of embedded grooves are formed in the front end and the rear end of the outer cover and are respectively communicated with the plurality of outer openings, an area enlarging sheet is arranged in each embedded groove, the area enlarging sheet is connected with the inner inserting sheet, the inner inserting sheets are respectively and fixedly connected in the plurality of outer openings, the front ends and the rear ends of the plurality of conducting sheets are fixedly connected with lower bending elastic plates, the plurality of lower bending elastic plates are respectively contacted with the plurality of inner inserting sheets, the bottom end of the inner shell is fixedly connected with a foundation platform, a mounting cavity and an annular groove are arranged in the foundation platform, the mounting cavity and the annular groove are mutually communicated, the connecting assembly comprises a synchronous gear and four hooking connecting rods, the synchronous gear and the four hooking connecting rods are all rotationally connected in the annular groove, driven gears are fixedly connected on the four hooking connecting rods, the four driven gears are engaged with the synchronous gear, a stirring structure is arranged in the mounting cavity and used for rotationally driving the synchronous gear, an inserting cavity matched with the foundation platform is arranged in the base, a side cavity is arranged in the inserting cavity and used for rotationally entering the four hooking connecting rods, so as to achieve the aim of positioning the foundation table in the insertion cavity.

As a further scheme of this scheme, stir the structure and include extending the post, extend the bottom of post with synchronous gear's top fixed connection, extend the post and rotate and connect in the installation cavity, extend the top fixedly connected with transfer line of post, the transfer line is located the installation cavity, and installation intracavity sliding connection has the carriage, carriage fixedly connected with elastic spring, the one end fixed connection that the carriage was kept away from to elastic spring is in the installation cavity, and the transfer line is connected with the carriage.

As a further scheme of the scheme, a strip opening and a middle groove are formed in the transmission rod, the strip opening is communicated with the middle groove, a connecting shaft is arranged in the strip opening, the sliding frame is inserted into the middle groove, a vertical hole is formed in the sliding frame, and the connecting shaft is fixedly connected in the vertical hole.

As a further proposal of the proposal, the sliding frame is provided with a guide hole, the guide hole is connected with a guide rod in a sliding way, and the guide rod is fixedly connected in the installation cavity.

As a further scheme of the scheme, the inner top wall of the outer cover is gradually reduced from the middle to the periphery.

As a further scheme of the scheme, four protruding tables are arranged on the outer cover, connecting holes are formed in the four protruding tables, connecting bolts are arranged in the connecting holes, four threaded hole plates are fixedly connected to the inner shell, and the four connecting bolts are respectively in threaded connection with the four threaded hole plates.

As a further scheme of the scheme, a plurality of gradual change slits are formed in the lower bending elastic plates, a plurality of protruding columns are arranged on the inner inserting pieces, and the protruding columns are matched with the gradual change slits respectively.

As a further proposal of the proposal, the sliding frame is provided with a protruding toggle plate.

As a further scheme of the scheme, a gap is formed in the sliding frame, and the gap provides enough movement space for relative movement of the transmission rod and the sliding frame.

As a further proposal of the proposal, the foundation platform is provided with an outer chamfer.

(III) beneficial effects

Compared with the prior art, the invention provides a waterproof structure for a PTC heater, which has the following beneficial effects:

1. according to the invention, through the design of the protective mounting assembly, the protective mounting of a plurality of PTC heaters is realized, and the waterproof performance of the PTC heaters can be realized while the heat conduction is ensured.

2. According to the invention, through the design of the connecting component, the installation of the protective installation component relative to the base is realized, meanwhile, the connecting points are symmetrically distributed, the connection reliability is good, and in the relative installation process of the PTC heater, the four hooking connecting rods can realize synchronous driving.

3. According to the invention, through the design of the stirring structure, the rotation driving of the synchronous gear can be realized outside, so that the synchronous stirring and the holding of the hooking states of the four hooking connecting rods are realized, and the protective mounting assembly is convenient and labor-saving relative to the mounting and dismounting operation of the base.

Drawings

FIG. 1 is a schematic perspective view of the whole structure of the present invention;

FIG. 2 is a schematic perspective view of a part of the whole of the present invention;

FIG. 3 is a schematic view of a partial enlarged structure at Z in FIG. 3 according to the present invention;

fig. 4 is a schematic perspective view showing the cooperation of the PTC heater, the inner housing and the conductive sheet for the vehicle according to the present invention;

FIG. 5 is a schematic view of a cross-sectional perspective of the foundation, hooking and connecting rods, and transmission rods of the present invention;

FIG. 6 is a schematic view of a partial enlarged structure at A in FIG. 5 according to the present invention;

FIG. 7 is a schematic view of another cross-sectional perspective of the foundation, hooking and connecting rods, and transmission rods of the present invention;

FIG. 8 is a schematic view of a partial enlarged construction of the invention at B in FIG. 7;

FIG. 9 is a schematic perspective view of a base of the present invention;

FIG. 10 is a schematic perspective view of a carriage of the present invention;

FIG. 11 is a schematic view of the overall bottom perspective of the present invention;

FIG. 12 is a schematic bottom perspective view of the cooperation of the housing and the projection table of the present invention;

FIG. 13 is a schematic view showing the bottom perspective of the inner housing, base table, guide bar, etc. of the present invention;

FIG. 14 is a schematic exploded perspective view of the mating of the conductive tab, area augmentation tab and inner insert tab of the present invention;

fig. 15 is a schematic view showing a bottom perspective structure of the synchronizing gear, the hooking connecting rod, the driven gear and the like of the present invention.

In the figure: 1. a base; 2. automobile PTC heater; 3. an outer cover; 4. an inner housing; 5. an inner port; 6. a conductive sheet; 7. an outer port; 8. an embedding groove; 9. an area increasing sheet; 10. an inner insert; 11. a lower bending elastic plate; 12. a base station; 13. a mounting cavity; 14. an annular groove; 15. a synchronizing gear; 16. hooking a connecting rod; 17. a driven gear; 18. an insertion cavity; 19. a side cavity; 20. an extension column; 21. a transmission rod; 22. a carriage; 23. an elastic spring; 24. a strip opening; 25. a middle groove; 26. a connecting shaft; 27. a vertical hole; 28. a guide hole; 29. a guide rod; 30. a protruding stand; 31. a connecting bolt; 32. gradually changing the seam; 33. a protruding post; 34. protruding the toggle plate; 35. a notch; 36. and (5) chamfering the outer part.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Examples

Referring to fig. 1-15, a waterproof structure for PTC heater comprises a base 1, a plurality of automotive PTC heaters 2, a protection installation assembly and a connection assembly, wherein the protection installation assembly comprises an outer cover 3 and an inner cover 4, the automotive PTC heaters 2 are fixedly connected in the inner cover 4, the inner top wall of the outer cover 3 is gradually reduced from the middle to the periphery, when external moisture enters the outer cover 3 to form aggregation and then is guided and discharged through the structure, the outer cover 3 covers the outer part of the inner cover 4, four protruding platforms 30 are arranged on the outer cover 3, connection holes are formed in the four protruding platforms 30, connection bolts 31 are arranged in the connection holes, four threaded hole plates are fixedly connected on the inner cover 4, the four connection bolts 31 are respectively connected in the four threaded hole plates in a threaded manner to realize the relative fixed connection between the outer cover 3 and the inner cover 4, a spacing cavity is arranged between the inner shell 4 and the outer cover 3, a plurality of inner openings 5 are arranged on the inner shell 4, a plurality of conducting sheets 6 are arranged in the inner shell 4, the plurality of conducting sheets 6 extend out of the inner shell 4 through the plurality of inner openings 5 respectively, a plurality of outer openings 7 are arranged on the outer cover 3, a plurality of embedded grooves 8 are respectively arranged at the front end and the rear end of the outer cover 3, the plurality of embedded grooves 8 are respectively communicated with the plurality of outer openings 7, an area increasing sheet 9 is respectively arranged in the plurality of embedded grooves 8, the plurality of area increasing sheets 9 are respectively connected with an inner inserting sheet 10, the plurality of inner inserting sheets 10 are respectively fixedly connected in the plurality of outer openings 7, the front end and the rear end of the plurality of conducting sheets 6 are respectively fixedly connected with a plurality of lower bending elastic plates 11, the plurality of lower bending elastic plates 11 are respectively contacted with the plurality of inner inserting sheets 10, a plurality of gradual change slits 32 are respectively arranged on the plurality of lower bending elastic plates 11, the utility model discloses a PTC heater's waterproof, a plurality of internal insertion piece 10 are gone up, all be provided with protruding post 33 on the internal insertion piece 10, a plurality of protruding posts 33 match with a plurality of gradual change seam 32 respectively, the bottom fixedly connected with foundation platform 12 of inner shell 4, be provided with installation cavity 13 and ring channel 14 in the foundation platform 12, installation cavity 13 and ring channel 14 communicate each other, through the design of protection installation component, protection installation of a plurality of PTC heater is realized, waterproof that the PTC heater can be realized when guaranteeing heat conduction, coupling assembling includes synchronizing gear 15 and four hook connecting rods 16, synchronizing gear 15 and four hook connecting rods 16 all rotate and connect in ring channel 14, all fixedly connected with driven gear 17 on four hook connecting rods 16, four driven gear 17 all mesh with synchronizing gear 15, through coupling assembling's design, realize protection installation component for the installation of base 1, the tie point adopts symmetric distribution simultaneously, the connection reliability is better, moreover, in the relative installation process of PTC heater, four hook connecting rods 16 can realize synchronous drive.

It should be further described that, the installation cavity 13 is internally provided with a stirring structure, the stirring structure is used for rotationally driving the synchronous gear 15, the base 1 is internally provided with an insertion cavity 18 matched with the foundation platform 12, the insertion cavity 18 is internally provided with a side cavity 19, the side cavity 19 is used for rotationally entering four hooking connecting rods 16 so as to achieve the purpose that the foundation platform 12 is positioned in the insertion cavity 18, the foundation platform 12 is provided with an outer chamfer 36 for facilitating the accelerated discharge of water on the foundation platform 12, the stirring structure comprises an extension column 20, the bottom end of the extension column 20 is fixedly connected with the top end of the synchronous gear 15, the extension column 20 is rotationally connected in the installation cavity 13, the top end of the extension column 20 is fixedly connected with a transmission rod 21, the transmission rod 21 is positioned in the installation cavity 13, a sliding frame 22 is connected in a sliding way, the sliding frame 22 is fixedly connected with an elastic spring 23, the elastic spring 23 is fixedly connected in the mounting cavity 13 at one end far away from the sliding frame 22, the transmission rod 21 is connected with the sliding frame 22, through the design of a toggle structure, the rotation driving of the synchronous gear 15 can be realized outside to achieve the synchronous toggle and hold of the hooked states of the four hooked connecting rods 16, the protective mounting assembly is more convenient and labor-saving relative to the mounting and dismounting operation of the base 1, the transmission rod 21 is provided with a strip port 24 and a middle groove 25, the strip port 24 is communicated with the middle groove 25, the strip port 24 is internally provided with a connecting shaft 26, the sliding frame 22 is inserted into the middle groove 25, the sliding frame 22 is provided with a vertical hole 27, the connecting shaft 26 is fixedly connected in the vertical hole 27, the concrete connecting structure between the transmission rod 21 and the sliding frame 22 is displayed, the transmission driving of the transmission rod 21 is ensured in the sliding process of the sliding frame 22, the sliding frame 22 is provided with a guide hole 28, the sliding connection of the guide hole 28 is provided with a guide rod 29, the guide rod 29 is fixedly connected in the mounting cavity 13, so that the direction of the sliding frame 22 is guided, meanwhile, the elastic spring 23 is supported conveniently, the stability of the extension and compression processes of the elastic spring 23 is guaranteed, the sliding frame 22 is provided with the protruding toggle plate 34, the protruding characteristics of the sliding frame 22 are increased, the sliding pushing of the sliding frame 22 is facilitated, the sliding frame 22 is provided with the notch 35, and the notch 35 provides enough movement space for the relative movement of the transmission rod 21 and the sliding frame 22.

The PTC heater for an automobile in this embodiment is a conventional device known to those skilled in the art and purchased in the market, and may be selected or customized according to actual needs, and only the PTC heater is used without improving its structure and function, and its setting, mounting and electrical connection modes, so long as the PTC heater is subjected to debugging operations according to the requirements of the specification of the PTC heater, and will not be described herein.

In summary, the working principle of the waterproof structure for the PTC heater is that, when the waterproof structure is used, the protective installation component comprising the PTC heater is installed relative to the base 1, when the protective installation component is installed, the sliding frame 22 is shifted rightwards by the protruding shifting plate 34, the sliding frame 22 is moved in the installation cavity 13, the elastic spring 23 is compressed in the process, the transmission rod 21 is pushed under the action of the connecting shaft 26 in the vertical hole 27 on the sliding frame 22, the transmission rod 21 is pushed to form a rotation motion, the extension column 20 is driven to rotate in the installation cavity 13, the extension column 20 is connected with the synchronizing gear 15, the rotation of the extension column 20 drives the synchronizing gear 15, the synchronous rotation of the four hook connecting rods 16 in the annular groove 14 can be realized under the action that the plurality of driven gears 17 are meshed with the synchronizing gear 15, and after the four hook connecting rods 16 are all rotated in the annular groove 14, stopping pushing the sliding frame 22, for the pushing range of the sliding frame 22, until the sliding frame 22 cannot be pushed to the right, because when the hooking connecting rod 16 rotates into the annular groove 14 and forms interference with the synchronous gear 15, the sliding frame 22 cannot continue to rotate, in this state, the sliding frame 22 cannot continue to stir to the right, then the stirring state of the sliding frame 22 is kept, the foundation table 12 is placed into the insertion cavity 18, then the pushing of the protruding stirring plate 34 is released, under the action of the elastic spring 23, the sliding frame 22 moves to the left for resetting, in the resetting auxiliary process of the sliding frame 22, the reverse stirring of the transmission rod 21 is driven, the reverse rotation of the synchronous gear 15 can reach the reverse rotation driving of the hooking connecting rod 16, so as to realize the rotation of the hooking connecting rod 16 into the side cavity 19, the hooking fixation of the foundation table 12 relative to the base 1 is formed, thus, the protection installation component is installed relative to the base 1, the PTC heater is correspondingly electrically assembled after the installation is completed, so that the power supply in the operation process of the PTC heater is ensured, heat generated by the PTC heater in daily operation is sequentially matched through the conducting sheet 6, the lower bending elastic plate 11, the inner inserting sheet 10 and the area increasing sheet 9, heat conduction is formed, when moisture enters the outer cover 3 and the inner shell 4, the middle of the inner top wall of the outer cover 3 gradually reduces towards the periphery, and the lower bending elastic plate 11 guides condensed moisture to be discharged outwards, so that the drying and the water resistance of the PTC heater are ensured, and when the PTC heater needs to be maintained, the whole protection installation component is pulled out in the inserting groove only by pulling the sliding frame 22 rightwards again, so that the pushing state of the sliding frame 22 is kept after the hooking connecting rod 16 in the annular groove 14 is rotated out of the side cavity 19.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a waterproof construction for PTC heater, includes base (1) and a plurality of car PTC heater (2), its characterized in that still includes protection installation component and coupling assembling, protection installation component includes dustcoat (3) and interior casing (4), and a plurality of car PTC heater (2) all fixed connection is in interior casing (4), dustcoat (3) cover is in the outside of interior casing (4), is provided with the compartment between interior casing (4) and dustcoat (3), has seted up a plurality of internal mouthful (5) on interior casing (4), is provided with a plurality of conducting strip (6) in interior casing (4), a plurality of conducting strip (6) are stretched out interior casing (4) through a plurality of internal mouthful (5) respectively, have seted up a plurality of external mouthful (7) on dustcoat (3), a plurality of embedded groove (8) all communicate with a plurality of external mouthful (7) respectively, a plurality of embedded groove (8) are provided with in-hole (8) and are provided with area (9), a plurality of inside connecting strip (10) are all connected with a plurality of internal connection piece (10) respectively in a plurality of internal connection piece (10) and a plurality of both ends are connected with each other inside a plurality of the piece (10 respectively, the utility model provides a plurality of buckle elastic plate (11) down respectively with a plurality of interior insert piece (10) contact, the bottom fixedly connected with foundation platform (12) of interior casing (4), be provided with installation cavity (13) and ring channel (14) in foundation platform (12), installation cavity (13) and ring channel (14) intercommunication each other, coupling assembling includes synchronizing gear (15) and four hook connecting rods (16), synchronizing gear (15) and four hook connecting rods (16) all rotate to be connected in ring channel (14), all fixedly connected with driven gear (17) on four hook connecting rods (16), four driven gear (17) all with synchronizing gear (15) meshing, install in installation cavity (13) and stir the structure, stir the rotation drive that the structure is used for synchronizing gear (15), be provided with in base (1) with the insert cavity (18) of foundation platform (12) matching, be provided with side cavity (19) in insert cavity (18), side cavity (19) are used for four hook connecting rods (16) to rotate and get into in order to carry out location in foundation platform (12) in order to reach the purpose.

2. A waterproof structure for a PTC heater according to claim 1, characterized in that the toggle structure comprises an extension column (20), the bottom end of the extension column (20) is fixedly connected with the top end of the synchromesh (15), the extension column (20) is rotatably connected in the mounting cavity (13), the top end of the extension column (20) is fixedly connected with a transmission rod (21), the transmission rod (21) is located in the mounting cavity (13), a sliding frame (22) is slidably connected in the mounting cavity (13), the sliding frame (22) is fixedly connected with an elastic spring (23), one end of the elastic spring (23) away from the sliding frame (22) is fixedly connected in the mounting cavity (13), and the transmission rod (21) is connected with the sliding frame (22).

3. A waterproof structure for a PTC heater according to claim 2, wherein the transmission rod (21) is provided with a strip opening (24) and a middle groove (25), the strip opening (24) is communicated with the middle groove (25), a connecting shaft (26) is provided in the strip opening (24), the sliding frame (22) is inserted into the middle groove (25), the sliding frame (22) is provided with a vertical hole (27), and the connecting shaft (26) is fixedly connected in the vertical hole (27).

4. A waterproof structure for a PTC heater according to claim 3, wherein the sliding frame (22) is provided with a guide hole (28), a guide rod (29) is slidably connected to the guide hole (28), and the guide rod (29) is fixedly connected to the inside of the installation cavity (13).

5. A water resistant construction for PTC heaters according to claim 4 wherein the inner top wall of the housing (3) is of a gradual configuration with a gradual decrease from the middle to the periphery.

6. The waterproof structure for a PTC heater according to claim 5, wherein four protruding stages (30) are provided on the outer cover (3), connection holes are provided on the four protruding stages (30), connection bolts (31) are provided in a plurality of the connection holes, four screw hole plates are fixedly connected to the inner case (4), and the four connection bolts (31) are respectively screw-connected to the four screw hole plates.

7. A waterproof structure for a PTC heater according to claim 6, wherein a plurality of gradual-change slits (32) are formed in the plurality of lower bending elastic plates (11), a plurality of protruding columns (33) are provided in the plurality of inner insertion pieces (10), and the plurality of protruding columns (33) are respectively matched with the plurality of gradual-change slits (32).

8. A waterproof structure for PTC heaters according to claim 7, characterized in that the sliding frame (22) is provided with protruding toggle plates (34).

9. A waterproof structure for a PTC heater according to claim 8, wherein the carriage (22) is provided with a notch (35), the notch (35) providing sufficient movement space for the relative movement of the transmission rod (21) and the carriage (22).

10. A waterproof structure for PTC heaters according to claim 9, characterized in that the foundation (12) is provided with an outer chamfer (36).