Waterproof PTC heater
Through the design of the waterproof PTC heater, the second waterproof cover that seals the opening of the shell and is welded to the shell is solved by using the first waterproof cover to seal the shell opening, and the problems of long injection molding cycle and poor waterproof effect caused by screw fixation are solved, and high waterproof grade and cost reduction are achieved.
Patent Information
- Application Number
- CN202421729986.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-07-19
AI Technical Summary
The existing small water heaters are screw-fixed to cause long injection molding cycles, high cost and poor waterproofing effect of parts, making it difficult to achieve high waterproofing levels.
The waterproof PTC heater is adopted, and the housing opening is sealed with the first waterproof cover and is welded and fixed with the housing through the second waterproof cover. Combined with multi-stage waterproof cover and ultrasonic welding, the use of screws is reduced and secondary waterproof is achieved.
With the premise of reducing screw usage, the waterproofing level is improved to IP67, reducing costs and simplifying the assembly process.
Smart Images
Figure CN223142161U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a heater, in particular to a waterproof PTC heater. Background Art
[0002] For the existing small water heaters, the assembly method of the water tank main body and the upper cover uses screws for fixation. To optimize production, when screwing the screws, the nuts rotate together and cannot be tightened firmly. Multiple copper nuts are embedded in the plastic part of the water tank main body, which will cause problems such as a long injection molding cycle and a high unit price due to the addition of nuts during part injection molding. Installing multiple screws on the product also increases the assembly cost.
[0003] In the above - mentioned way, the upper cover and the water tank main body are fixed by screws, and the mating surface cannot effectively prevent water, with a low protection level. When it is necessary to meet the IPX4 waterproof level, processes such as applying silicone rubber need to be added, which not only increases the cost but also affects the aesthetic appearance due to the glue application. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a waterproof PTC heater, and the technical problem to be solved is to improve the waterproof effect on the premise of reducing the use of screws.
[0005] To solve the above problems, the utility model is realized by adopting the following technical solutions: A waterproof PTC heater includes a housing with an inner cavity, and a waterproof heating core is arranged in the housing. The housing includes an open end and a closed surface opposite thereto. An inlet and an outlet are provided on the closed surface. A first waterproof cover is provided on the open end to seal the open end. A hole for the insulating lead of the heating core to pass through is provided on the first waterproof cover, and the insulating lead passes through the hole and is sealed therewith. A PCB board with a terminal is provided on the first waterproof cover. A second waterproof cover is provided at one end of the housing where the open end is located, and the second waterproof cover is fixedly welded to the housing. A hole for the terminal to extend out is provided on the second waterproof cover, and a sealing sleeve is provided on the terminal to achieve sealing with the hole on the second waterproof cover.
[0006] Further, a circumferential protruding edge is provided at one end of the housing where the open end is located, so that the open end protrudes above the edge to form a protrusion. The edge is adapted to the second waterproof cover, and the second waterproof cover abuts against the edge and is fixedly welded.
[0007] Further, a fixed cover connected by a buckle is provided on the first waterproof cover, and the PCB board is fixed on the fixed cover.
[0008] Further, the heating core includes a waterproof and heat - conducting outer shell. The first waterproof cover is fixedly connected to the waterproof and heat - conducting outer shell to form a T - shape. A sealing ring is provided outside the waterproof and heat - conducting outer shell. The first waterproof cover abuts against the open end of the housing and is hermetically connected to the open end through the sealing ring.
[0009] Further, the edge of the open end is provided with a stepped structure, and the sealing ring is arranged in the stepped structure.
[0010] Further, elastic clamping arms are provided on the opposite side edges of the fixed cover, and buckling holes are arranged on the elastic clamping arms. A protruding buckle is arranged on the outer peripheral wall of the protrusion of the housing. The fixed cover is fixedly clamped through the buckling holes on the elastic clamping arms and the buckle, and the first waterproof cover is hermetically fixed on the open end.
[0011] Further, a receiving groove is provided at the position of the second waterproof cover corresponding to the hole. The receiving groove communicates with the hole on the second waterproof cover, and the sealing sleeve is arranged in the receiving groove.
[0012] Compared with the prior art, the utility model seals the open end of the housing through the first waterproof cover, and then realizes secondary waterproofing of components such as the PCB board through the second waterproof cover. Since the second waterproof cover is fixed to the housing by welding, the waterproof level of the product is improved on the premise of reducing the use amount of screws, and the cost is reduced. Description of the Drawings
[0013] Figure 1 is the external schematic diagram of the utility model.
[0014] Figure 2 is the exploded schematic diagram of the utility model.
[0015] Figure 3 is Figure 1 the cross-sectional view taken along the A-A direction in
[0016] Figure 4 is the internal structure schematic diagram of the utility model. Detailed Embodiment
[0017] The following further describes the utility model in detail with reference to the drawings and embodiments.
[0018] Such as Figures 1 to 4As shown in the figure, the utility model discloses a waterproof PTC heater, which includes a housing 1 with an inner cavity. The cross-section of the housing 1 is rectangular. A waterproof heating core 2 is arranged in the housing 1, and the heating core 2 heats the water in the inner cavity of its housing 1. The housing 1 includes an open end and a closed surface opposite thereto. An inlet 3 and an outlet 4 are provided on the closed surface. In the present utility model, the heating core 2 is a PTC heating core. The heating core 2 includes a waterproof and heat-conducting housing 12. A first waterproof cover 5 is provided on the open end to seal the open end and prevent water from leaking out of the open end. A hole for the insulating lead 6 of the heating core 2 to pass through is provided on the first waterproof cover 5, and the insulating lead 6 passes through the hole and is sealed with it. The sealing can be achieved by methods such as dispensing. In the present utility model, the waterproof and heat-conducting housing 12 and the first waterproof cover 5 are made of the same material and fixed by welding. A PCB board 7 with a terminal 17 is provided on the first waterproof cover 5. A second waterproof cover 8 is provided at one end of the housing 1 where the open end is located. The second waterproof cover 8 is a lid structure with a surrounding edge. The second waterproof cover 8 and the periphery of the housing 1 are fixed by ultrasonic welding, so that the second waterproof cover 8 forms a sealed space, thereby realizing the secondary waterproofing of the PCT board 7 and the product. A hole for the terminal 17 is provided on the second waterproof cover 8. A sealing sleeve 9 is provided on the terminal 17 to achieve sealing with the hole on the second waterproof sealing cover 8. A receiving groove 18 is provided at the hole position of the second waterproof cover 8. The receiving groove 18 communicates with the hole on the second waterproof cover 8. The sealing sleeve 9 is arranged in the receiving groove 18 to limit the sealing sleeve 9.
[0019] The above structure can achieve improved waterproof effect on the premise of reducing the use amount of screws, and also avoids the need to apply silicone rubber to the product to meet the requirements of IPX4 waterproof grade.
[0020] As Figure 2 and Figure 3 shown in the figure, a protruding edge 10 is provided at one end of the housing 1 where the open end is located, so that the open end protrudes above the edge 10 to form a protrusion. The edge 10 is adapted to the second waterproof cover 8. The second waterproof cover 8 abuts against the edge 10 and is fixed by ultrasonic welding. Since the contact between the edge 10 and the second waterproof cover 8 is a plane, after ultrasonic welding, the upper cover welding wire and the housing 1 can be fused together more firmly, playing a role in waterproof protection for the heating core 2.
[0021] As Figure 3As shown in the figure, a fixed cover 11 connected by snap - fit is provided on the first waterproof cover 5, and the PCB board 7 is fixed on the fixed cover 11 to tightly connect the first waterproof cover 5 to the open end. Specifically, the snap - fit is achieved in the following way: elastic snap - arms 15 are provided on the opposite two - side edges of the fixed cover 11, and snap - holes 13 are provided on the elastic snap - arms 15. On the outer peripheral wall of the open end of the housing 1, protruding snap - fasteners 16 are provided. The fixed cover 11 is snap - fit and fixed through the snap - holes 13 on the elastic snap - arms 15, and the first waterproof cover 5 is hermetically fixed on the open end.
[0022] As Figure 3 shown, the sealing between the first waterproof cover 5 and the open end is achieved by the following structure. A sealing ring 14 is provided near the first waterproof cover 5 on the waterproof and heat - conductive housing 12. After the first waterproof cover 5 is pressed and fixed by the fixed cover 11, the sealing ring 14 completely fills the gap between the open end and the waterproof and heat - conductive housing 12 to prevent water from entering the PTC heating core cavity.
[0023] In the present utility model, the edge of the open end is set as a stepped structure, and the sealing ring 14 is arranged in the stepped structure to improve the sealing effect and prevent the problem that the sealing ring 14 is displaced after thermal expansion.
[0024] As Figure 4 shown, a partition 19 is further provided in the inner cavity of the housing 1. The partition separates the position where the water inlet 3 is located from the position where the water outlet 4 is located, so as to force the water to flow from a part of the position where the water inlet 3 is located to a part of the position where the water outlet 4 is located after entering, so that the water can be fully heated.
[0025] The present utility model has the following advantages: changing the multi - screw fixing method to ultrasonic welding fixing, eliminating the process of applying silicone rubber, greatly saving costs and assembly difficulty.
[0026] Due to the cooperation of the multi - level waterproof cover and ultrasonic welding, the protection level can be upgraded to IP67.
Claims
1. A waterproof PTC heater, comprising a housing (1) having an inner cavity, and a waterproof heating core (2) is arranged in the housing (1), characterized in that: The housing (1) includes an open end and a closed surface opposite thereto. The closed surface is provided with a water inlet (3) and a water outlet (4). A first waterproof cover (5) is provided on the open end to seal the open end. A hole is provided on the first waterproof cover (5) for the insulating lead (6) of the heating element (2) to pass through. The insulating lead (6) passes through the hole and is sealed therewith. A PCB board (7) having a terminal (17) is provided on the first waterproof cover (5). A second waterproof cover (8) is provided at one end of the housing (1) where the open end is located. The second waterproof cover (8) is fixedly welded to the housing (1). A hole is provided on the second waterproof cover (8) for the terminal (17) to protrude. A sealing sleeve (9) is provided on the terminal (17) to achieve sealing with the hole on the second waterproof cover (8).
2. The waterproof PTC heater according to claim 1, wherein: One end of the housing (1) where the open end is located is provided with a protruding edge (10) around it, so that the open end protrudes above the edge (10) to form a protrusion. The edge (10) is adapted to the second waterproof cover (8), and the second waterproof cover (8) abuts against the edge (10) and is fixedly welded thereto.
3. The waterproof PTC heater according to claim 2, characterized in that: A fixing cover (11) is provided on the first waterproof cover (5) and is fixed by snap connection. The PCB board (7) is fixed on the fixing cover (11).
4. The waterproof PTC heater according to claim 3, wherein: The heating element (2) includes a waterproof and heat-conducting housing (12). The first waterproof cover (5) is fixedly connected to the waterproof and heat-conducting housing (12) to form a T shape. A sealing ring (14) is provided outside the waterproof and heat-conducting housing (12). The first waterproof cover (5) abuts against the open end of the housing (1) and is hermetically connected to the open end through the sealing ring (14).
5. The waterproof PTC heater according to claim 4, characterized in that: The edge of the open end is arranged in a stepped structure, and the sealing ring (14) is arranged in the stepped structure.
6. The waterproof PTC heater according to claim 3, wherein: Elastic clamping arms (15) are provided on the opposite two side edges of the fixing cover (11). Buckle holes (13) are provided on the elastic clamping arms (15). A protruding buckle (16) is provided on the outer peripheral wall of the protrusion of the housing (1). The fixing cover (11) is fixedly clamped to the buckle (16) through the buckle holes (19) on the elastic clamping arms (15), and the first waterproof cover (5) is hermetically fixed on the open end.
7. The waterproof PTC heater according to claim 1, wherein: A receiving groove (18) is provided at the hole of the second waterproof cover (8). The receiving groove (18) communicates with the hole on the second waterproof cover (8). The sealing sleeve (9) is arranged in the receiving groove (18).