Liquid heater

Abstract

The utility model discloses a liquid heater relates to electrician technical field, wherein, liquid heater includes inner bag, heat conduction board and heating device, heat conduction board sets up at the bottom of inner bag, is equipped with mounting hole on heat conduction board, heating device sets up at the side of heat conduction board away from inner bag, mounting hole is located the area outside heating device, and mounting hole is used to accommodate temperature sensor, heat conduction board and inner bag weld as a whole, and the bottom of inner bag is equipped with the protruding structure to heat conduction board, and at least part protruding structure and the position of mounting hole correspond.

Description

Technical Field

[0001] This utility model relates to the field of electrical technology, and in particular to a liquid heater. Background Technology

[0002] Currently, liquid heaters on the market, taking electronic kettles as an example, have electronic controls. They have a temperature sensor at the bottom of the inner liner to sense the temperature of the liquid being heated. In non-contact temperature sensing, the temperature sensor is placed on the heat-conducting plate at the bottom of the inner liner and does not come into contact with the water. This structure is safe and reliable and does not have problems such as leakage. However, due to the limitations of heat transfer structure, a separate hole needs to be made on the heat transfer plate to place the temperature sensor. After the heat transfer plate is made, it is welded to the bottom of the inner liner. After the inner liner is welded at the corresponding opening of the heat transfer plate, it will deform and form a dent, affecting the product's texture. Utility Model Content

[0003] The main objective of this invention is to provide a liquid heater that addresses the aforementioned problems.

[0004] To achieve the above objectives, the liquid heater proposed in this utility model includes:

[0005] Inner liner;

[0006] A heat-conducting plate is disposed at the bottom of the inner liner, and mounting holes are provided on the heat-conducting plate; and

[0007] A heating device is disposed on the side of the heat-conducting plate away from the inner liner; the mounting hole is located in an area outside the heating device, and the mounting hole is used to accommodate a temperature sensor; the heat-conducting plate is welded to the inner liner as a whole; the bottom of the inner liner is provided with a protruding structure facing the heat-conducting plate, and at least part of the protruding structure corresponds to the position of the mounting hole.

[0008] In one embodiment, the protruding structure is integrally stretched and formed at the bottom of the inner liner.

[0009] In one embodiment, the protruding structure is formed by a stamping process, with the bottom of the inner liner cavity recessed towards the outside of the inner liner.

[0010] In one embodiment, the bottom surface of the inner cavity of the inner liner is a plane, and the protrusion structure is configured as a compensating member to enhance the rigidity of the mounting hole area.

[0011] In one embodiment, the protrusion structure is a circular reinforcing portion corresponding to the diameter of the mounting hole or an annular reinforcing portion corresponding to the edge of the mounting hole.

[0012] In one embodiment, the protruding structure is an annular reinforcing portion surrounding the bottom of the inner liner, and the mounting hole is projected onto the annular reinforcing portion on the inner liner.

[0013] In one embodiment, the height of the protrusion structure is 0.1mm-0.5mm.

[0014] In one embodiment, the maximum width of the protrusion structure is greater than the diameter of the mounting hole.

[0015] In one embodiment, the heating device, the heat-conducting plate, and the inner liner are welded together as a single unit.

[0016] In one embodiment, the heating device includes a heating tube surrounding the edge of the heat-conducting plate, and a mounting opening is formed between the two ends of the heating tube, with the mounting hole positioned directly opposite the mounting opening.

[0017] In one embodiment, the liquid heater further includes a temperature controller and a mounting bracket; the temperature controller is fixed to the heat-conducting plate via the mounting bracket and is located within the area surrounding the heating tube.

[0018] The technical solution of this utility model suppresses welding deformation by setting a raised structure at the bottom of the inner liner. This solves the problem that when the heat-conducting plate is welded to the inner liner to install a temperature sensor through a mounting hole, the inner liner is prone to deformation at the mounting hole, leaving marks. The raised structure forms a pre-support welding area, which is a compensation design. The pre-deformation offsets the difference in welding shrinkage, similar to "using a convex shape to correct a concave shape", which suppresses thermal deformation at the mounting hole of the heat-conducting plate. This solves the problem of deformation at the position of the temperature sensor and improves the appearance of the inner liner. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is an exploded structural diagram of an embodiment of the liquid heater provided by this utility model;

[0021] Figure 2 for Figure 1 A schematic diagram of the structure after installation.

[0022] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure in the middle;

[0023] Figure 4 for Figure 3 A cross-sectional structural schematic diagram of one embodiment of the inner liner.

[0024] Explanation of icon numbers:

[0025] 10. Inner liner;

[0026] 20. Raised structure;

[0027] 30. Heat-conducting plate; 31. Mounting holes;

[0028] 40. Heating device; 41. Heating tube; 42. Installation opening;

[0029] 51. Temperature sensor; 52. Temperature controller; 53. Mounting bracket; 531. Sensor bracket;

[0030] 61. Electrical control board; 62. Onboard bracket.

[0031] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0033] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0034] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0035] Currently, liquid heaters on the market, taking electronic kettles as an example, have electronic controls. They have a temperature sensor at the bottom of the inner liner to sense the temperature of the liquid being heated. In non-contact temperature sensing, the temperature sensor is placed on the heat-conducting plate at the bottom of the inner liner and does not come into contact with the water. This structure is safe and reliable and does not have problems such as leakage. However, due to the limitations of heat transfer structure, a separate hole needs to be made on the heat transfer plate to place the temperature sensor. After the heat transfer plate is made, it is welded to the bottom of the inner liner. After the inner liner is welded at the corresponding opening of the heat transfer plate, it will deform and form a dent, affecting the product's texture.

[0036] This utility model proposes a liquid heater.

[0037] Please see Figures 1 to 3 In one embodiment of this utility model, the liquid heater includes an inner liner 10, a heat-conducting plate 30, and a heating device 40. The inner liner 10 is disposed at the bottom of the inner liner 10, and the heat-conducting plate 30 has a mounting hole 31. The heating device 40 is disposed on the side of the heat-conducting plate 30 away from the inner liner 10. The mounting hole 31 is located in the area outside the heating device 40 and is used to accommodate a temperature sensor 51. The heat-conducting plate 30 is welded to the inner liner 10 as a whole. The bottom of the inner liner 10 has a protruding structure 20 facing the heat-conducting plate 30, and the position of the protruding structure 20 corresponds to that of the mounting hole 31.

[0038] The technical solution of this utility model is to suppress welding deformation by setting a protruding structure 20 at the bottom of the inner liner 10, thereby solving the problem that when the heat-conducting plate 30 is welded to the inner liner 10 with the installation hole 31 for the installation of the temperature sensor 51, the inner liner 10 is prone to deformation at the installation hole 31, forming a mark.

[0039] The expansion rates of the heat transfer plate (usually an aluminum / copper alloy) and the inner liner 10 (usually stainless steel) differ significantly. During high-temperature welding, the heat transfer plate expands more than the inner liner 10. During cooling and contraction, the heat transfer plate contracts more violently, forming a tensile stress concentration zone at the edge of the opening. Due to the high-temperature welding of the heat transfer plate and the bottom of the inner liner 10, the two materials exhibit different degrees of thermal deformation after heating, resulting in a depression at the opening of the heat transfer plate. This leads to an unsightly indentation inside the cavity of the inner liner 10.

[0040] To solve this problem, a raised structure 20 is formed on the bottom surface facing the heat-conducting plate 30, and at least part of the raised structure 20 corresponds to the mounting hole 31.

[0041] Taking the heat-conducting plate 30 (stainless steel) and the inner liner 10 (aluminum) as an example, both expand when heated during welding, but stainless steel "shrinks" faster when cooled (with a smaller coefficient of thermal expansion), causing the mounting hole 31 to collapse like a piece of fabric that has been "pulled into a dent".

[0042] The raised structure 20 serves as a pre-elevation. The raised part at the bottom of the inner liner 10 is equivalent to a "compensation raised part" before sewing, filling the space that the stainless steel has shrunk. The mounting hole 31 is the weakest point of the heat conduction plate 30. The raised structure 20 supports this point like a fist pressing against the dent of a plastic bag, keeping it flat during cooling (just like laying a layer of stones on sand that is prone to collapse, so that there will be no deep pits when rolling the road).

[0043] This utility model solution provides a raised structure 20 at the bottom of the inner liner 10 to form a pre-supported welding area, thus creating a compensation design. The pre-deformation offsets the welding shrinkage difference, similar to "using a convex structure to correct a concave one" to suppress thermal deformation at the mounting hole 31 of the heat-conducting plate 30, solving the problem of deformation at the position of the temperature sensor 51 and improving the appearance of the inner liner 10.

[0044] Of course, without loss of generality, in other embodiments, the protrusion structure 20 may also be replaced with other reinforcing structures that can achieve equivalent anti-deformation function, such as the protrusion structure 20 being a compensating member for enhancing the stiffness of the mounting hole 31 area, such as a local thickening layer or a composite material support sheet.

[0045] The mounting hole 31 area is not limited to a local area with a projected shape and size of the mounting hole 31, but rather forms a ring-shaped area.

[0046] In one embodiment, the protruding structure 20 is formed by stamping, and the protruding structure 20 is formed at the bottom of the inner liner 10 by a stamping process.

[0047] In one embodiment, the protrusion structure 20 is formed by stretching, and the protrusion structure 20 is an integrally stretched protrusion structure 20 formed at the bottom of the inner liner 10.

[0048] In one embodiment, the protruding structure 20 is formed by a reverse concave shape, wherein the protruding structure 20 is formed by the bottom of the inner liner 10 cavity concave towards the outside of the inner liner 10, just as pressing the surface of a balloon from the inside will cause the outer part to bulge.

[0049] Specifically, regardless of the molding method, the protruding structure 20 can be set as a circular reinforcing part corresponding to the outline size of the mounting hole 31; or the protruding structure 20 can be an annular reinforcing part provided at the bottom of the inner liner 10.

[0050] In order to solve the deformation problem of the inner liner 10 through the protruding structure 20, while taking into account the heat transfer effect of the heat-conducting plate 30 on the inner liner 10, the height of the protruding structure 20 is 0.1mm-0.5mm, such as 0.15mm, 0.2mm, 0.3mm, etc.

[0051] Furthermore, the maximum width of the protrusion structure 20 is greater than the diameter of the mounting hole 31. For example, when the protrusion structure 20 is circular, the radius of the protrusion structure 20 is greater than the radius of the mounting hole 31, such as 0.1mm, 0.2mm, 0.3mm, etc.

[0052] In this scheme, a "liquid heater" refers to a device that converts electrical energy into heat energy through energy conversion and then acts on a liquid medium to raise its temperature. Its core lies in "directly heating the liquid," which needs to be distinguished from devices that indirectly heat liquids (such as steam boilers). It mainly refers to the generation of heat through the Joule effect of current flowing through a resistance wire / heating tube (such as a nickel-chromium alloy), such as the heat from the heating tube being conducted to the liquid through the metal tube wall.

[0053] Liquid heaters (including but not limited to electric kettles, coffee makers, tea makers, etc.) are readily understood to be suitable for all liquid heating equipment with heat-conducting plates 30 welded by means of the raised structure 20 at the bottom of the inner tank 10 to suppress welding deformation.

[0054] The following description uses an electric kettle as an example. The electric kettle includes a kettle body, an inner liner 10, and a handle. The inner liner 10 is located inside the kettle body.

[0055] Combined with reference Figure 4 The inner liner 10 includes a bottom plate and side panels (the inner liner 10 may also include a spout, handle mounting position, etc.). The bottom plate and the side panels are connected to form a cavity for holding liquid. The bottom plate has a bottom surface facing the heat-conducting plate 30. The heat-conducting plate 30 is disposed on the bottom surface of the bottom plate. The heat-conducting plate 30 has a heating surface facing away from the bottom plate. The heating device 40 is disposed on the heating surface. The heating surface has a mounting hole 31 through the heat-conducting plate 30 outside the heating device 40. The mounting hole 31 is used to place the temperature sensor 51. In one embodiment, the heat-conducting plate 30 is welded to the inner liner 10 as a whole. In another embodiment, the heat-conducting plate 30 is welded to the inner liner 10 and the heating device 40 as a whole.

[0056] Reference Figure 1 and Figure 3 The heat transfer plate, as a whole, can evenly transfer heat from the heating device 40 to heat the inner liner 10. The mounting holes 31 ensure accurate temperature measurement by the sensor and guarantee accurate temperature response. The heat transfer plate 30 is welded to the heating tube 41 of the heating device 40 to form an integrated assembly, providing mechanical strength and thermal stability.

[0057] In one embodiment, the temperature sensor 51 is disposed on the outer shell of the inner liner 10, and the temperature sensor 51 is embedded in the mounting hole 31 by mounting the outer shell and the inner liner 10.

[0058] In this embodiment, the liquid heater also includes a temperature controller 52 and a mounting bracket 53. The mounting bracket 53 is fastened to the heat-conducting plate 30 by screws. The temperature controller 52 is mounted on the mounting bracket 53. The mounting bracket 53 also has a sensor bracket 521. The sensor is fixed on the sensor bracket 521 and placed in the mounting hole 31 to ensure accurate temperature measurement. The temperature sensor 51 (such as an NTC thermistor) is installed in the mounting hole 31, while the temperature controller 52 is fixed to the surface of the heat transfer plate by studs. The temperature controller 52 and the temperature sensor 51 are connected in parallel, respectively undertaking basic safety protection and precise temperature control functions. The temperature sensor 51 (such as an NTC thermistor or thermocouple) needs to be embedded in the mounting hole 31 of the heat transfer plate to monitor the temperature of the inner tank 10 in real time, output analog / digital signals, and transmit the temperature value to the electronic control board 61 (MCU) for algorithm decision-making (such as PID control).

[0059] The temperature controller 52 is the core control component of the electric kettle. It is an electromechanical temperature switch that controls the circuit's on / off state through internal physical deformation. Its core functions include: preventing dry-boil and automatically cutting off power, automatically cutting off power when the water boils, and high-temperature fuse protection. Specifically, when there is no water in the kettle, it automatically cuts off the power to prevent the heating element from overheating and causing a fire; when the water temperature reaches the boiling point (usually 100℃), the steam pushes the bimetallic strip to cut off the power, preventing continued boiling; when the main temperature controller fails, the backup temperature controller 52 melts when the temperature exceeds the limit (e.g., above 110℃), permanently cutting off the circuit.

[0060] Furthermore, the heating device 40 includes a heating tube 41 that surrounds the edge of the heat-conducting plate 30. An installation opening 42 is formed between the two ends of the heating tube 41, and the mounting hole 31 is positioned directly opposite the installation opening 42, completely avoiding the projection area of ​​the heating tube 41 on the bottom of the inner liner 10. This is to prevent the temperature sensor 51 from entering a high-temperature area. When the heating tube 41 surrounds the heat-conducting plate 30, the installation openings 42 formed at both ends are relatively low-temperature areas (cold ends). The temperature sensor 51 is placed in the low-temperature opening area of ​​the heating ring, avoiding direct heat radiation interference and improving temperature measurement accuracy.

[0061] Furthermore, the liquid heater also includes a temperature sensor 51 and a mounting bracket 53; the mounting bracket 53 is fixed to the heat-conducting plate 30 by studs and is located within the annular area formed by the heating tube 41; the mounting bracket 53 integrates a sensor bracket 521, and the temperature sensor 51 is embedded in the mounting hole 31 and locked with the mounting bracket 53; the temperature sensor 51 is an NTC thermistor or a thermocouple. The temperature sensor 51 and the temperature controller 52 are integrated through a bracket design, using a single bracket to fix both the temperature controller 52 and the sensor, ensuring precise fitting of the sensor to the mounting hole 31 and simplifying assembly. Precise fitting of the sensor to the mounting hole 31 is achieved through the integrated bracket, ensuring tight thermal contact. Furthermore, it also includes an electronic control board 61 and an onboard bracket 62; the onboard bracket 62 is located above the heating tube 41 and is fixedly connected to the mounting bracket 53; the electronic control board 61 is disposed within the onboard bracket 62 and is electrically connected to the temperature sensor 51 and the heating device 40.

[0062] The onboard bracket 62 of the control board 61 is semi-circular and located above the heating tube 41, and is connected to the bracket of the temperature controller 52. This solves the problems of high-temperature isolation and vibration transmission: the semi-circular structure allows the control board 61 to be suspended to avoid heat radiation, and the rigid connection with the temperature controller 52 bracket forms an overall anti-vibration structure. In this way, the position of the control board 61 is raised to avoid the high-temperature zone, and the semi-circular bracket disperses mechanical stress and prevents the transmission of heat deformation.

[0063] Specifically, the heating tube 41 is spirally arranged around the heat-conducting plate 30 to increase the contact area with the heat-conducting plate 30, thereby improving heating efficiency. The heating tube 41 is made of high-temperature resistant and thermally conductive stainless steel to ensure its stability and durability under long-term high-temperature operating conditions. Thermally conductive silicone is filled between the temperature sensor 51 and the mounting hole 31 to ensure good heat conduction between the temperature sensor 51 and the heat transfer plate. The outer surface of the temperature sensor 51 is provided with an insulating coating to prevent short circuits with other conductive components.

[0064] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A liquid heater, characterized in that, include: Inner liner; A heat-conducting plate is disposed at the bottom of the inner liner, and mounting holes are provided on the heat-conducting plate; as well as A heating device is disposed on the side of the heat-conducting plate away from the inner liner; the mounting hole is located in an area outside the heating device, and the mounting hole is used to accommodate a temperature sensor; the heat-conducting plate is welded to the inner liner as a whole; the bottom of the inner liner is provided with a protruding structure facing the heat-conducting plate, and at least part of the protruding structure corresponds to the position of the mounting hole.

2. The liquid heater as described in claim 1, characterized in that, The protruding structure is integrally stretched and formed at the bottom of the inner liner.

3. The liquid heater as described in claim 1, characterized in that, The protruding structure is formed by a stamping process, with the bottom of the inner liner cavity recessed towards the outside of the inner liner.

4. The liquid heater as claimed in claim 1, characterized in that, The bottom surface of the inner cavity of the inner liner is flat, and the protruding structure is configured as a compensating member to enhance the rigidity of the mounting hole area.

5. The liquid heater as claimed in claim 1, characterized in that, The protruding structure is either a circular reinforcing part corresponding to the diameter of the mounting hole or an annular reinforcing part corresponding to the edge of the mounting hole.

6. The liquid heater as claimed in claim 1, characterized in that, The protruding structure is an annular reinforcing part arranged around the bottom of the inner liner, and the mounting hole is projected onto the annular reinforcing part on the inner liner.

7. The liquid heater as claimed in claim 1, characterized in that, The height of the protrusion is 0.1mm-0.5mm; and / or, the maximum width of the protrusion is greater than the diameter of the mounting hole.

8. The liquid heater as claimed in claim 1, characterized in that, The heating device, the heat-conducting plate, and the inner liner are welded together as one unit.

9. The liquid heater as claimed in claim 1, characterized in that, The heating device includes a heating tube that surrounds the edge of the heat-conducting plate, and an installation opening is formed between the two ends of the heating tube, with the installation hole positioned directly opposite the installation opening.

10. The liquid heater as claimed in claim 9, characterized in that, The liquid heater also includes a temperature controller and a mounting bracket; the temperature controller is fixed to the heat-conducting plate via the mounting bracket and is located within the area surrounding the heating tube.

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