Heating plate temperature control assembly, heating device and heating method

Abstract

The present invention relates to the field of temperature sensor technology, and is a heating disk temperature control component and a heating device and method, wherein the heating disk temperature control component includes a first temperature sensor and a second temperature sensor, the first temperature sensor includes a first thermistor for monitoring the temperature of the water body, and the second temperature sensor includes a second thermistor for monitoring the temperature of the heating disk; the first thermistor and the second thermistor are of the same model. The water body temperature is compared with the heating disk temperature to obtain the degree of residual heat of the heating disk, and the heating disk is controlled to be turned on or off in advance according to the degree of residual heat of the heating disk. The surface temperature and liquid temperature are measured respectively by two sensors with the same parameters, and the temperature difference between the heating disk surface and the liquid can be measured and controlled by the resistance ratio, thereby solving the problem that conventional electronic thermostats or bimetallic thermostats can only maintain a constant single temperature point. By optimizing the design of the heat-conducting structure and the mounting structure, the interface is unified and the wiring harness is standardized.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature sensors, and in particular to a heating plate temperature control component, a heating device and a heating method. Background Art

[0002] Heating plate assemblies using electric heating tubes have been widely used in a variety of drinking and cooking water heating products such as wall breakers, kettles, electric water cups, steamers, dishwashers, sterilizers, and electric fryers due to their better economy, good structural strength, and easy installation. However, due to the variable installation position and power of the heating tubes on the plate, and the fact that more and more kitchen appliances currently require precise temperature control at multiple temperature points rather than a single constant temperature or boiling the water, stronger and stronger temperature control capabilities are needed. In particular, there are now many hot kettles on the market, which have long waiting times for water to be discharged, or each time the hot water is boiled, due to the thermal inertia of the system and the difference in temperature feedback, there is a large error between the water temperature and the heating plate, which can easily cause the water to boil but the heating plate continues to heat. This not only wastes energy, but also prolongs the heating time and affects the user experience. Summary of the Invention

[0003] The present invention provides a heating plate temperature control component, a heating device and a heating method, which solve the above-mentioned technical problem of weak temperature control ability of heating electronic devices such as kettles.

[0004] In order to solve the above technical problems, the present invention provides a heating plate temperature control assembly, comprising a first temperature sensor and a second temperature sensor, wherein the first temperature sensor comprises a first thermistor for monitoring the temperature of a water body, and the second temperature sensor comprises a second thermistor for monitoring the temperature of the heating plate;

[0005] The first thermistor and the second thermistor are of the same model.

[0006] Preferably, the first thermistor is a single-ended glass-sealed thermistor, one end of which passes through the heating plate and is immersed in the water body, and the lead at the other end is electrically connected to the circuit board.

[0007] Preferably, the first temperature sensor further comprises a sheet metal flange shell, the sheet metal flange shell is fixedly connected to the heating plate, and the single-ended glass-sealed thermistor is potted on the sheet metal flange shell by silicone.

[0008] Preferably, the first temperature sensor further includes a first plug-in terminal and a first support frame, the lead of the single-ended glass-sealed thermistor is welded to the first plug-in terminal, and one end of the first plug-in terminal is injection-molded and bonded to the first support frame to form an integrated structure.

[0009] Preferably, the lead wire of the single-ended glass-sealed thermistor is covered with an insulating sleeve.

[0010] Preferably, the second temperature sensor further comprises a nickel-plated copper sheet metal for heat conduction and installation support, and the second thermistor is fixedly connected to the nickel-plated copper sheet metal.

[0011] Preferably, the second temperature sensor further includes a second plug-in terminal and a second support frame, the lead of the second thermistor is welded to the second plug-in terminal, and one end of the second plug-in terminal is injection-molded and bonded to the second support frame to form an integrated structure.

[0012] The present invention also provides a heating device, comprising a heating plate and a heating plate temperature control assembly, wherein the first temperature sensor and the second temperature sensor are both fixedly connected to the heating plate.

[0013] The present invention also provides a method for a heating plate temperature control assembly, comprising:

[0014] The water temperature is monitored in real time by a first thermistor, and the heating plate temperature is monitored in real time by a second temperature sensor, wherein the first thermistor and the second thermistor are of the same model;

[0015] Compare the water temperature with the heating plate temperature to obtain the residual heat level of the heating plate;

[0016] The heating plate is turned on or off in advance according to the residual heat level of the heating plate.

[0017] Preferably, the residual heat level of the heating disk is obtained in real time when every 1% difference between the water temperature and the heating disk temperature corresponds to a temperature difference of 0.2°C.

[0018] Beneficial effects: The present invention provides a heating plate temperature control component and a heating device and method, wherein the heating plate temperature control component includes a first temperature sensor and a second temperature sensor, the first temperature sensor includes a first thermistor for monitoring the water temperature, and the second temperature sensor includes a second thermistor for monitoring the heating plate temperature; the first thermistor and the second thermistor are of the same model. The water temperature is compared with the heating plate temperature to obtain the degree of residual heat of the heating plate, and the heating plate is controlled to be turned on or off in advance according to the degree of residual heat of the heating plate. The surface temperature and liquid temperature are measured respectively by two sensors with the same parameters, and the temperature difference between the heating plate surface and the liquid can be measured and controlled by the resistance ratio, thereby solving the problem that conventional electronic thermostats or bimetallic thermostats can only maintain a single temperature point. Through the optimized design of the thermal conductive structure and the mounting structure, the interface is unified and the wiring harness is standardized. The high thermal conductive structure can achieve fast response and small temperature gradient while ensuring insulation.

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the description, the following preferred embodiments of the present invention are described in detail with reference to the accompanying drawings. The specific implementation methods of the present invention are given in detail by the following embodiments and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 This is a front view of the second temperature sensor of the heating plate temperature control assembly of the present invention;

[0022] Figure 2 This is a left view of the second temperature sensor of the heating plate temperature control assembly of the present invention;

[0023] Figure 3 This is the front view of the first temperature sensor of the heating plate temperature control assembly of the present invention

[0024] Figure 4 This is a left view of the first temperature sensor of the heating plate temperature control assembly of the present invention;

[0025] Figure 5 This is a schematic diagram of the exploded structure of the second temperature sensor of the heating plate temperature control assembly of the present invention;

[0026] Figure 6 This is a schematic diagram of the exploded structure of the first temperature sensor of the heating plate temperature control assembly of the present invention;

[0027] Figure 7 This is a schematic diagram of the reverse side of the assembly of the heating plate temperature control component and the heating plate of the present invention;

[0028] Figure 8 This is a front view of the assembly of the heating plate temperature control component and the heating plate of the present invention.

[0029] Explanation of the accompanying drawings: nickel-plated copper sheet metal 1, second thermistor 2, second thermally conductive PPS injection molding body 3, second support frame 4, second plug-in terminal 5, sheet metal flange shell 6, single-ended glass-sealed thermistor 7, silicone 8, insulating sleeve 9, first plug-in terminal 10, first support frame 11, low-pressure injection molding body 12, sealing silicone ring 13, heating plate 100, first temperature sensor 200, second temperature sensor 300. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention. The following paragraphs describe the present invention in more detail by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in exact proportions. They are only used to facilitate and clearly illustrate the purpose of the embodiments of the present invention.

[0031] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a central component. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] like Figures 1 to 6 As shown, the present invention provides a heating disk temperature control assembly, including a first temperature sensor and a second temperature sensor, the first temperature sensor includes a first thermistor for monitoring the water temperature, and the second temperature sensor includes a second thermistor 2 for monitoring the heating disk temperature; the first thermistor and the second thermistor 2 are of the same model. The water temperature is compared with the heating disk temperature to obtain the degree of residual heat of the heating disk, and the heating disk is controlled to be turned on or off in advance according to the degree of residual heat of the heating disk. The surface temperature and liquid temperature are measured respectively by two sensors with the same parameters, and the temperature difference between the heating disk surface and the liquid can be measured and controlled by the resistance ratio, solving the problem that conventional electronic thermostats or bimetallic thermostats can only maintain a single temperature point. Through the optimized design of the thermal conductive structure and the mounting structure, the interface is unified and the wiring harness is standardized. The high thermal conductive structure can achieve fast response and small temperature gradient under the premise of ensuring insulation.

[0034] The first sensor combines a small sensor housing with a mounting plate and overmoldes it into a liquid temperature sensor, resulting in a high-strength wiring harness and extremely fast response. The second temperature sensor utilizes a U-shaped thermally conductive mounting plate with thermally conductive PPS (with added ceramic powder) overmolded to provide highly consistent and accurate flat surface temperature measurement.

[0035] In a preferred embodiment, the first thermistor is a single-ended glass-sealed thermistor 7, one end of which passes through the heating plate and is immersed in the water, and the other end is electrically connected to the circuit board. The first temperature sensor also includes a sheet metal flange shell 6, which is fixedly connected to the heating plate. The single-ended glass-sealed thermistor 7 is potted in the sheet metal flange shell 6 using silicone rubber 8. The first temperature sensor also includes a first plug-in terminal 10 and a first support frame 11. The lead of the single-ended glass-sealed thermistor 7 is welded to the first plug-in terminal 10, and one end of the first plug-in terminal 10 is injection-molded and bonded to the first support frame 11 to form an integrated structure. The lead of the single-ended glass-sealed thermistor 7 is covered with an insulating sleeve 9. It can be seen that the first temperature sensor uses a sheet metal flange shell 6 as a mounting plate, the single-ended glass-sealed thermistor 7 is encapsulated in the sheet metal flange shell 6 by silicone rubber 8, the insulating sleeve 9 is installed on the lead of the single-ended glass-sealed thermistor 7, the single-ended glass-sealed thermistor 7 is welded to the plug-in terminal, the plug-in terminal is injection-molded to the plug-in structure support frame, the plug-in structure support frame is injection-molded to the low-pressure injection molding body 12, and the sealing silicone ring 13 is installed on the sheet metal flange shell 6.

[0036] In a preferred embodiment, the second temperature sensor further includes a nickel-plated copper sheet metal 1 for heat conduction and mounting support, and the second thermistor 2 is fixedly connected to the nickel-plated copper sheet metal 1. The second temperature sensor further includes a second plug-in terminal 5 and a second support frame 4. The lead of the second thermistor 2 is welded to the second plug-in terminal 5, and one end of the second plug-in terminal 5 is injection-molded and bonded to the second support frame 4 to form an integrated structure. It can be seen that the second temperature sensor uses the nickel-plated copper sheet metal 1 as a heat conduction plate and mounting plate, the thermistor is connected to the nickel-plated copper sheet metal 1 via the second heat-conducting PPS injection molding body 3, the plug-in structure support frame is connected to the second heat-conducting PPS injection molding body 3 to form a whole, and the plug-in terminal is injection-molded and connected to the plug-in structure support frame.

[0037] In summary, the two temperature sensors (i.e., the first temperature sensor and the second temperature sensor) can be installed with screws to any heat accumulation risk point on the heating plate. They are small in size and easy to install. Due to the plug-in structure design, the wiring harness can be installed vertically on the heating plate in a bus manner, without being restricted by the wiring harness's temperature resistance. By using thermally conductive PPS as the injection molding encapsulation material between the thermistor and the thermally conductive mounting plate, the overall sensor structure has a temperature resistance of 300°C. At the same time, the thermistor is surrounded on three sides by the copper thermal conductive sheet of the thermally conductive mounting plate, which can minimize the impact of temperature gradient loss caused by insulation spacing and provide more accurate temperature measurement. The plug-in structure support frame on the upper layer of the thermally conductive plastic is made of ordinary PPS / PBT material, which can reduce heat dissipation upward from the component. This resolves the contradiction between a small package shell and low lead strength. By welding and overmolding the plug-in, the sensor has a high-strength plug-in terminal and a temperature-sensing shell with a minimum diameter, which gives the sensor excellent response speed and excellent installation strength.

[0038] Among them, the heating plate plane temperature sensor and the heating plate water temperature sensor use thermistors with the same parameters. In this way, when testing the same product, in addition to simultaneously monitoring the real-time temperature of the heating plate installation position and the temperature of the heated object, it is also possible to easily calculate the current resistance difference ratio based on the characteristics of NTC by dividing the resistance values ​​of the two sensors. According to the temperature difference of 0.2°C corresponding to every 1% difference, the residual heat level of the heating plate can be obtained in real time, and whether the heating plate continues to heat can be quickly controlled, thereby responding to the temperature fluctuation of the heated object in advance at a high rate.

[0039] like Figures 7 and 8 As shown, the present invention also provides a heating device, including a heating plate 100 and a heating plate temperature control assembly, wherein a first temperature sensor 200 and a second temperature sensor 300 are both fixedly connected to the heating plate 100. The first temperature sensor 200 and the second temperature sensor 300 can be installed by screws to any heat accumulation risk point on the heating plate, with a small size and convenient installation. Due to the plug-in structure design, its wiring harness can be installed perpendicular to the heating plate surface in a bus manner, without being restricted by the wiring harness's temperature resistance.

[0040] The first temperature sensor is generally one, and the second temperature sensor can be one or more, and both are connected to the heating plate by bolts or welding.

[0041] The present invention also provides a method for a temperature control assembly of a heating plate, comprising: real-time monitoring of the water temperature through a first thermistor, and real-time monitoring of the heating plate temperature through a second temperature sensor, wherein the first thermistor and the second thermistor are of the same model; comparing the water temperature with the heating plate temperature to obtain the degree of residual heat of the heating plate; and controlling the opening or closing of the heating plate in advance according to the degree of residual heat of the heating plate.

[0042] The first and second temperature sensors use thermistors with the same parameters. In this way, when testing the same product, in addition to simultaneously monitoring the real-time temperature of the heating plate installation location and the temperature of the heated object, the current resistance difference ratio can be easily calculated by dividing the resistance values ​​of the two sensors based on the characteristics of NTC. According to the 0.2°C temperature difference corresponding to every 1% difference, the residual heat level of the heating plate can be obtained in real time, and the heating plate can be quickly controlled to continue heating, thereby responding to temperature fluctuations of the heated object in advance at a high rate.

[0043] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in this industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with this profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. A heating plate temperature control assembly, characterized in that: The first temperature sensor comprises a first thermistor for monitoring the temperature of the water body and the second temperature sensor comprises a second thermistor for monitoring the temperature of the heating plate; The first thermistor and the second thermistor have the same model; The first thermistor is a single-ended glass-sealed thermistor, one end of which passes through the heating plate and is immersed in the water body, and the lead at the other end is electrically connected to the circuit board; The first temperature sensor further includes a first plug-in terminal and a first support frame, the lead of the single-ended glass-sealed thermistor is welded to the first plug-in terminal, and one end of the first plug-in terminal is injection-molded and bonded to the first support frame to form an integrated structure; The second temperature sensor further comprises a nickel-plated copper sheet metal for heat conduction and mounting support, and the second thermistor is fixedly connected to the nickel-plated copper sheet metal; The second temperature sensor further includes a second plug-in terminal and a second support frame, the lead of the second thermistor is welded to the second plug-in terminal, and one end of the second plug-in terminal is injection-molded and bonded to the second support frame to form an integrated structure; The nickel-plated copper sheet metal includes a bottom plate and two side plates, the two side plates are respectively arranged on both sides of the bottom plate, and the second thermistor is arranged in a semi-enclosed structure enclosed by the bottom plate and the two side plates.

2. The heating plate temperature control assembly according to claim 1, characterized in that: The first temperature sensor further includes a sheet metal flange shell, which is fixedly connected to the heating plate, and the single-ended glass-sealed thermistor is potted on the sheet metal flange shell by silicone.

3. The heating plate temperature control assembly according to claim 1, characterized in that: The lead wire of the single-ended glass-sealed thermistor is covered with an insulating sleeve.

4. A heating device comprising a heating plate, characterized in that: It also includes the heating plate temperature control assembly according to any one of claims 1 to 3, wherein the first temperature sensor and the second temperature sensor are both fixedly connected to the heating plate.

5. A method for the heating plate temperature control assembly according to any one of claims 1 to 3, characterized in that: include: The water temperature is monitored in real time by a first thermistor, and the heating plate temperature is monitored in real time by a second temperature sensor, wherein the first thermistor and the second thermistor are of the same model; Comparing the resistance value of the first thermistor with the resistance value of the second thermistor to obtain the residual heat level of the heating disk; The heating plate is turned on or off in advance according to the residual heat level of the heating plate.

6. The heating plate temperature control method according to claim 5, characterized in that: The current resistance difference ratio is calculated based on the resistance values ​​of the first thermistor and the second thermistor, and the residual heat level of the heating plate is obtained in real time based on the 0.2°C temperature difference corresponding to every 1% difference.

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