Heating base and liquid heater

Abstract

The utility model discloses a heating base and a liquid heater, the heating base comprises a plastic base body, a PTC heating body and a circuit board electrically connected with the PTC heating body, and the circuit board is provided with a temperature controller; the PTC heating body comprises an aluminum shell and a plurality of low-temperature semiconductor ceramic chips, the aluminum shell comprises a body with a containing cavity and an assembling part integrated with the body, and the low-temperature semiconductor ceramic chips are assembled in the containing cavity side by side at intervals. At least one insulating layer is arranged between the low-temperature semiconductor ceramic chip and the body, and the assembling part is fixedly assembled on the plastic seat body. According to the heating base, a plurality of low-temperature semiconductor ceramic chips are adopted in a PTC heating body, on the premise that the design power of the PTC heating body is met, the PTC heating body shows the low-temperature characteristic to the outside so that the PTC heating body can have the low surface temperature, the assembling structure between the PTC heating body and a plastic base body can be simplified, fuses on a circuit board can be omitted, and the cost is reduced. The device has the advantages of low implementation cost, easy assembly, reliable work and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to a heating base and a liquid heater. Background Art

[0002] Liquid heaters are electrical appliances that are often used in people's lives. Aluminum heating tubes or copper heating tubes are usually used as heating elements. In order to ensure the appropriate heating time, the dry-burning temperature of the heating element is above 270 degrees. Therefore, it is necessary to configure a thermostat and a fuse on the power circuit board of the heating element for double protection, which brings the following defects:

[0003] 1. Due to the high temperature of the heating element, a heat insulation design is required between the heating element and the plastic base of the liquid heater to prevent the heat radiated by the heating element from melting the plastic base, resulting in a more complicated assembly structure between the heating element and the plastic base.

[0004] 2. If the fuse overheats and blows, the liquid heater cannot be used and must be disassembled for repair and replacement of the fuse on the power circuit board, which is inconvenient for users. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art, and proposes a heating base and a liquid heater, which reduces the surface temperature (or dry-burning temperature) of the PTC heating element by improving the structure of the PTC heating element, so as to simplify the assembly structure between the PTC heating element and the plastic base.

[0006] The utility model proposes a heating base, comprising a plastic base, a PTC heating element and a circuit board electrically connected to the PTC heating element, wherein the circuit board has a temperature controller; the PTC heating element comprises an aluminum shell and a plurality of low-temperature semiconductor ceramic sheets, the aluminum shell comprises a main body having a accommodating cavity and an assembly part which is an integral structure with the main body, a plurality of the low-temperature semiconductor ceramic sheets are assembled side by side and at intervals in the accommodating cavity, and at least one insulating layer is provided between the low-temperature semiconductor ceramic sheets and the main body, and the assembly part is fixedly assembled on the plastic base.

[0007] In some preferred embodiments, the accommodating cavity is in a tetrahedral shape, and at least four of the low-temperature semiconductor ceramic sheets are arranged side by side and spaced apart in the length direction of the accommodating cavity.

[0008] In some preferred embodiments, the width W of the accommodating cavity is ≥30 mm, and the height H of the accommodating cavity is ≥3.5 mm.

[0009] In some preferred embodiments, 35 mm ≤ W ≤ 50 mm, 4 mm ≤ H ≤ 6 mm.

[0010] In some preferred embodiments, a heat insulating pad is provided between the assembly portion and the plastic base.

[0011] In some preferred embodiments, the assembly portion and the plastic base are clamped and sealed via a sealing ring.

[0012] In some preferred embodiments, a mounting seat with a sealing ring groove is provided on the plastic seat body, and the sealing ring is arranged in the sealing ring groove.

[0013] In some preferred embodiments, a plurality of studs are provided on the outer side of the sealing ring groove, and a plurality of assembly grooves are correspondingly provided on the assembly portion. A heat-insulating screw gasket is provided between each of the assembly grooves and the studs at the corresponding position. The screws pass through the heat-insulating screw gaskets and are locked with the studs, so that the assembly portion and the plastic base are fastened and assembled.

[0014] In some preferred embodiments, the mounting seat is protruded from the plastic seat body, and the plastic seat body is further provided with a mounting position, the mounting position is located lower than the mounting seat and is located on a side of the mounting seat, and the circuit board is assembled at the mounting position.

[0015] The utility model also discloses a liquid heater, comprising a heating container for containing liquid and the heating base, wherein the heating container is located on the heating base.

[0016] The heating base disclosed in the utility model has low cost, is easy to assemble and works reliably. The PTC heating element is provided with a plurality of low-temperature semiconductor ceramic sheets in the PTC heating element. Under the premise of meeting the design power of the PTC heating element, the PTC heating element is allowed to show low-temperature characteristics to the outside and thus has a lower surface temperature (or dry-burning temperature), thereby bringing at least two beneficial technical effects:

[0017] First, there is no need for a special insulation design between the PTC heater and the plastic base. The heat radiated by the PTC heater is relatively low, so the plastic base will not be melted by the heat. This simplifies the assembly structure between the PTC heater and the plastic base. The assembly part of the PTC heater can be fixed on the plastic base using an insulation pad. The assembly structure is simple and easy to disassemble and maintain.

[0018] Second, since the dry-burning temperature of the PTC heater is relatively low, there is no need to configure a fuse on the circuit board when designing thermal protection for the PTC heater. By omitting the fuse, not only can the cost be reduced, but also the defect of the liquid heater being unable to continue working due to a blown fuse can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the exploded structure of the heating base.

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the heating base.

[0021] Figure 3 This is a front view of the PTC heating element.

[0022] Figure 4 It is a cross-sectional schematic diagram of a PTC heating element. DETAILED DESCRIPTION

[0023] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined purpose, the specific implementation methods, structures, features and effects of the present application are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0024] The liquid heater provided by the utility model comprises a heating base and a heating container for containing liquid, wherein the heating container is located on the heating base, and the heating base is used to heat the heating container.

[0025] Liquid heaters are electrical appliances that are frequently used in households. The actual products are very wide, including but not limited to egg boilers, kettles, steamers, bottle sterilizers and other products.

[0026] The heating base proposed in the utility model adopts a PTC heater as a heating element. By improving the structure of the PTC heater, the PTC heater can show a low temperature characteristic to the outside to reduce the surface temperature (or dry-burning temperature) of the PTC heater while meeting the design power of the PTC heater. This can not only solve the problem of dry-burning thermal protection, but also help to simplify the assembly structure between the PTC heater and the plastic base.

[0027] Specifically, combined Figure 1-Figure 4 As shown, the heating base includes a plastic base 1, a PTC heating element 2 and a circuit board 3 electrically connected to the PTC heating element 2, and the circuit board 3 has a thermostat. In order to reduce the heat transfer from the PTC heating element 2 to the plastic base 1, a heat insulation pad 4 is provided between the PTC heating element 2 and the plastic base 1, and the heat insulation pad 4 is used to reduce the heat generated by the PTC heating element 2 from being transferred to the plastic base 1 to protect the plastic base 1 and prevent the plastic base 1 from being overheated and causing structural damage.

[0028] The PTC heating element 2 includes an aluminum shell 21 and a plurality of low-temperature semiconductor ceramic sheets 22. The aluminum shell 21 includes a main body 211 having a housing cavity 201 and an assembly portion 212 which is an integral structure with the main body 211. The plurality of low-temperature semiconductor ceramic sheets 22 are assembled side by side in the housing cavity 201, and there is at least one insulating layer (not shown) between the low-temperature semiconductor ceramic sheets 22 and the main body 211. The assembly portion 212 is fixedly assembled on the plastic base 1.

[0029] By using a plurality of the low-temperature semiconductor ceramic sheets 22 in the PTC heating element 2, the PTC heating element 2 can show low-temperature characteristics to the outside and thus have a lower surface temperature (or dry-burning temperature) under the premise of meeting the design power of the PTC heating element 2, thereby bringing at least two beneficial technical effects:

[0030] First, there is no need for a special heat insulation design between the PTC heater 2 and the plastic base 1. The heat radiated by the PTC heater 2 is relatively low, so that the plastic base 1 will not be melted by the heat. This simplifies the assembly structure between the PTC heater 2 and the plastic base 1. The assembly portion 212 of the PTC heater 2 can be fixedly assembled on the plastic base 1 using the heat insulation pad 4. The assembly structure is simple and easy to disassemble and maintain.

[0031] Second, since the dry-burning temperature of the PTC heating element 2 is relatively low, there is no need to configure a fuse on the circuit board 3 when designing thermal protection for the PTC heating element 2. By omitting the fuse, not only can the cost be reduced, but also the defect of the liquid heater being unable to continue working due to a blown fuse can be avoided.

[0032] The insulating layer is generally insulating paper. When the insulating paper is multi-layered, the insulating performance between the low-temperature semiconductor ceramic sheet 22 and the aluminum shell 21 can be improved.

[0033] like Figure 4 In the embodiment shown, the accommodating cavity 201 is in a tetrahedral shape, and at least four of the low-temperature semiconductor ceramic sheets 22 (in Figure 4 The low temperature semiconductor ceramic sheet 22 is electrically connected to the circuit board 3 via a wire 23 .

[0034] Especially combined with Figure 3-Figure 4 As shown, the width W of the accommodating cavity 201 is ≥30 mm, and the height H of the accommodating cavity 201 is ≥3.5 mm. The accommodating cavity 201 has a large width W and height H, which not only provides sufficient assembly space for assembling at least four of the low-temperature semiconductor ceramic sheets 22, but also has a large size of the aluminum shell 21 and strong external heat dissipation, which is conducive to controlling the surface temperature of the PTC heating element 2 to meet the design requirements.

[0035] Preferably, 35mm≤W≤50mm, 4mm≤H≤6mm.

[0036] For example, when the PTC heating element 2 has a power of 270-350W, the width W is between 37-42mm, the height H is between 4.5-5.5mm, and no less than 4 pieces of the low-temperature semiconductor ceramic sheets 22 are installed side by side in the accommodating cavity 201, the surface temperature of the PTC heating element 2 can be controlled below 230 degrees. At the same time, with a silicone ring with a thickness greater than 4mm and a tightly installed thermal insulation pad 4, the liquid heater can safely reduce the dry-burning temperature of the PTC heating element 2 itself, so as to fundamentally solve the problem of dry-burning heat protection, reduce the complicated processes of liquid heater production, improve production efficiency, save processes, and fundamentally improve safety requirements.

[0037] Combine again Figure 1 and Figure 2 As shown, the assembly portion 212 of the PTC heating element 2 is clamped and sealed to the plastic base 1 by a sealing ring 6 .

[0038] Specifically, a mounting seat 11 with a sealing ring groove 12 is provided on the plastic seat body 1, and the sealing ring 6 is arranged in the sealing ring groove 12. A plurality of studs 13 are provided on the outer side of the sealing ring groove 12, and the assembly portion 212 is correspondingly provided with a plurality of assembly grooves 202; the heat insulation pad 4 adopts a heat insulation screw gasket, and a heat insulation screw gasket is provided between each of the assembly grooves 202 and the stud 13 at the corresponding position, and the screw 5 passes through the heat insulation screw gasket and is locked with the stud 13, so that the PTC heating element 2 is sealed and fastened with the plastic seat body 1 through the assembly portion 212.

[0039] Among them, an assembly groove 202 is respectively provided at the four corners of the assembly part 212, and correspondingly, a stud 13 is respectively provided at four different positions outside the sealing ring groove 12, and four screws 5 are used to pass through four heat-insulating screw gaskets to achieve sealing and fastening assembly.

[0040] Furthermore, the mounting seat 11 is convexly disposed on the plastic seat body 1, and the plastic seat body 1 is further provided with a mounting position 19, the mounting position 19 is located lower than the mounting seat 11 and is located on a side of the mounting seat 11, and the circuit board 3 is assembled at the mounting position 19. With such a structure, when the circuit board 3 is assembled at the mounting position 19, the circuit board 3 almost overlaps with the side of the mounting seat 11, reducing the heat generated by the PTC heating element 2 from radiating to the circuit board 3, thereby simplifying the assembly and heat insulation protection of the circuit board 3.

[0041] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A heating base, comprising a plastic base, a PTC heating element and a circuit board electrically connected to the PTC heating element, wherein the circuit board has a temperature controller; characterized in that: The PTC heating element includes an aluminum shell and a plurality of low-temperature semiconductor ceramic sheets. The aluminum shell includes a main body having a housing cavity and an assembly part which is an integral structure with the main body. The plurality of low-temperature semiconductor ceramic sheets are assembled side by side in the housing cavity, and there is at least one insulating layer between the low-temperature semiconductor ceramic sheets and the main body. The assembly part is fixedly assembled on the plastic base.

2. The heating base according to claim 1, characterized in that: The accommodating cavity is in a tetrahedral shape, and at least four of the low-temperature semiconductor ceramic sheets are arranged side by side and spaced apart in the length direction of the accommodating cavity.

3. The heating base according to claim 2, characterized in that: The width W of the accommodating cavity is ≥30 mm, and the height H of the accommodating cavity is ≥3.5 mm.

4. The heating base according to claim 3, characterized in that: 35mm≤W≤50mm, 4mm≤H≤6mm.

5. The heating base according to claim 1, characterized in that: A heat insulation pad is provided between the assembly portion and the plastic seat body.

6. The heating base according to claim 1, characterized in that: The assembly portion and the plastic seat body are clamped and sealed in connection with each other through a sealing ring.

7. The heating base according to claim 6, characterized in that: A mounting seat with a sealing ring groove is arranged on the plastic seat body, and the sealing ring is arranged in the sealing ring groove.

8. The heating base according to claim 7, characterized in that: A plurality of studs are provided on the outer side of the sealing ring groove, and a plurality of assembly grooves are correspondingly provided on the assembly part. A heat-insulating screw gasket is provided between each assembly groove and the stud at the corresponding position. The screws pass through the heat-insulating screw gasket and lock with the stud, so that the assembly part and the plastic seat are fastened and assembled.

9. The heating base according to claim 7, characterized in that: The mounting seat is convexly arranged on the plastic seat body. The plastic seat body is further provided with a mounting position. The mounting position is located lower than the mounting seat and is located at a side of the mounting seat. The circuit board is assembled at the mounting position.

10. A liquid heater, comprising a heating container for containing liquid, characterized in that: It also includes the heating base as described in any one of claims 1-9, and the heating container is located on the heating base.

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