NTC (Negative Temperature Coefficient) electric boiling device

Abstract

An NTC electric boiling device comprises a pot body, a power source and a heating disc assembly, the heating disc assembly comprises a panel and a sealing cover, an upper insulation mica sheet, the heating assembly and a lower insulation mica sheet are sequentially connected through the sealing cover and the inner wall face of the panel in a pressed mode, an inner hole is formed in the middle of the panel, the upper surface of an NTC sensor abuts against the lower surface of the pot body, and the upper surface of the NTC sensor abuts against the lower surface of the pot body. The periphery of the panel is provided with a reinforcing edge, the axial direction of an inner hole of the panel extends downwards to form a positioning column, the periphery of the sealing cover is provided with a reinforcing edge, the periphery of the sealing cover is fixed with the peripheral curled edge of the panel, the middle part of the sealing cover is provided with a concave position corresponding to the inner hole, and the NTC sensor is fixed in the inner hole and the concave position. The positioning column penetrates through the concave position, and a pin of the NTC sensor penetrates through the concave position; and the power supply is electrically connected with the heating disc assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of electric boiling devices, and in particular to an NTC electric boiling device. Background Art

[0002] Electric cooking devices are widely used in household life and are one of the most widely used appliances in Chinese people's lives.

[0003] The existing NTC sensor realizes the two functions of pot body detection and temperature detection. It is usually located under the heating plate. After the heating plate is punched, the NTC sensor is installed by riveting. However, it is difficult to process and the insulating sheet is easily damaged during the installation and fixing process, thereby reducing the yield rate of the heating plate. Summary of the Invention

[0004] The purpose of the present invention is to provide an NTC electric cooking device that is easy to install and use and has a long service life in order to solve the above problems. The present invention achieves the above purpose through the following technical solutions:

[0005] An NTC electric cooking device comprises a pot body, a power supply and a heating plate assembly. The heating plate assembly comprises a panel, a heating assembly, an upper insulating mica sheet, a lower insulating mica sheet and a cover. The upper insulating mica sheet, the heating assembly and the lower insulating mica sheet are sequentially sealed and pressed against the inner wall of the panel.

[0006] An inner hole is provided in the middle of the panel, and the NTC sensor passes through the panel, the heating component, the upper insulating mica sheet, the lower insulating mica sheet and is fixedly connected to the cover. The upper surface of the NTC sensor abuts against the lower surface of the pot body.

[0007] The outer periphery of the panel is provided with a reinforcement edge, and the inner hole of the panel is provided with a positioning column extending axially downward.

[0008] The heating component, the upper insulating mica sheet, and the lower insulating mica sheet are provided with through holes corresponding to the NTC sensor;

[0009] The outer periphery of the cover is provided with a reinforced edge, the outer periphery of the cover is fixed with the outer periphery of the panel by a crimping edge, a recess is provided in the middle portion of the cover corresponding to the inner hole, the NTC sensor is fixed in the inner hole and the recess, the positioning post passes through the recess, and the pins of the NTC sensor pass through the recess;

[0010] The power supply is electrically connected to the heating plate assembly.

[0011] The heating component is a heating wire reel, which is formed by a horizontally laid heating wire, with the starting end and the ending end adjacent to each other, and is provided with a connector. The connector is distributed to connect the starting end, the ending end, and passes through the lower insulating mica sheet to connect with the wiring terminal outside the cover.

[0012] The heating component includes a heating core plate, the upper insulating mica sheet and the lower insulating mica sheet are located above and below the heating core plate, and the heating core plate includes a first mica sheet and a second mica sheet. The first mica sheet and the second mica sheet are provided with a plurality of slots around their peripheries. The heating wire is wound into the upper part of the first mica sheet, continuously wound in the slots, led out from the upper part of the second mica sheet, passed through the lower insulating mica sheet, and connected to the cover and the terminal.

[0013] The spacings between the plurality of card slots are the same.

[0014] The difference in the spacing between the plurality of card slots is less than 5% to 20% of the spacing.

[0015] The lower insulating mica sheet is provided with a lead-out opening corresponding to the heating wire, and the heating wire is led out from the lead-out opening of the cover.

[0016] The terminal comprises a terminal and a rivet piece. The heating wire is led out from the lead opening of the cover and penetrates into the terminal. A portion of the rivet piece is sleeved on the terminal, and the other end is riveted and fixed to the cover by a rivet.

[0017] The surface of the panel is provided with an anodized layer.

[0018] The NTC sensor includes an end cap, a thermistor, a reset spring and a positioning piece. The pins of the thermistor extend through the positioning piece and extend out of the recess. A support leg is provided at the lower end of the end cap. The reset spring is sleeved on the support leg. The lower side of the reset spring contacts the bottom surface of the recess. The positioning piece fixes the thermistor to the inner cavity of the end cap.

[0019] The positioning post passes through the recess and bends to fix the cover and the panel.

[0020] Beneficial effects:

[0021] The present invention integrates the NTC sensor into the heating plate through the design of the panel and the cover, and has two functions: temperature detection and pressure triggering of the pot body. It is firmly fixed and not easy to be damaged. It effectively eliminates the traditional drilling installation method of the NTC sensor, can effectively improve the yield of the heating plate, and avoid the problem of damage to the insulating mica sheet caused by drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 An exploded view of the present invention;

[0024] Figure 2 A perspective view of the present invention;

[0025] Figure 3 is another perspective view of the present invention;

[0026] Figure 4 is a cross-sectional view of the present invention;

[0027] Figure 5 for Figure 4 A partial enlarged view of

[0028] Figure 6 This is an exploded view of the upper insulating mica sheet, the heating component and the lower insulating mica sheet of the present invention.

[0029] The following are the descriptions of the reference numerals:

[0030] 1——Panel, 101——Inner hole, 102——Location column;

[0031] 2——Upper insulating mica sheet;

[0032] 3 - heating component, 301 - first mica sheet, 302 - second mica sheet, 303 - heating wire, 304 - slot;

[0033] 4——lower insulating mica sheet;

[0034] 5 - cover, 501 - recessed position;

[0035] 6——end cover, 7——thermistor, 8——positioning piece, 9——reset spring. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0037] An NTC electric cooking device comprises a pot body, a power supply and a heating plate assembly. The heating plate assembly comprises a panel 1, a heating component 3, an upper insulating mica sheet 2, a lower insulating mica sheet 4 and a cover 5. The upper insulating mica sheet 2, the heating component 3 and the lower insulating mica sheet 4 are sequentially pressed and connected to the inner wall surface of the panel 1 by the cover 5.

[0038] An inner hole 101 is provided in the middle of the panel 1. The NTC sensor passes through the heating base, the heating component 3, the upper insulating mica sheet 2, the lower insulating mica sheet 4 and is fixedly connected to the cover 5. The upper surface of the NTC sensor abuts against the lower surface of the pot body.

[0039] The outer periphery of the panel 1 is provided with a reinforcement edge, and a positioning column 102 is provided extending axially downward from the inner hole 101 of the panel 1.

[0040] The heating component 3, the upper insulating mica sheet 2, and the lower insulating mica sheet 4 are provided with through holes corresponding to the NTC sensor;

[0041] The outer periphery of the cover 5 is provided with a reinforced edge, and the outer periphery of the cover 5 is fixed to the outer periphery of the panel 1 by a crimping edge. A recess 501 is provided in the middle of the cover 5 corresponding to the inner hole 101. The NTC sensor is fixed in the inner hole 101 and the recess 501. The positioning column 102 passes through the recess 501, and the pins of the NTC sensor pass through the recess 501.

[0042] The power supply is electrically connected to the heating plate assembly.

[0043] The heating component 3 is a heating wire coil, which is formed by a horizontally laid heating wire 303, with the starting end and the ending end adjacent to each other, and is provided with a connector, which is distributed to connect the starting end, the ending end, and pass through the lower insulating mica sheet 4 to connect with the terminal outside the cover 5.

[0044] The heating component 3 includes a heating core plate, and the upper insulating mica sheet 2 and the lower insulating mica sheet 4 are located above and below the heating core plate. The heating core plate includes a first mica sheet 301 and a second mica sheet 302. The first mica sheet 301 and the second mica sheet 302 are surrounded by a plurality of card slots 304. The heating wire 303 is wound into the upper part of the first mica sheet 301, continuously wound in the card slots 304, and led out from the upper part of the second mica sheet 302, passing through the lower insulating mica sheet 4 and the cover 5 to be connected to the terminal.

[0045] The spacing between the plurality of slots 304 is the same.

[0046] The difference in the spacing between the plurality of slots 304 is less than 5% to 20% of the spacing.

[0047] The lower insulating mica sheet 4 is provided with a lead-out opening corresponding to the heating wire 303 , and the heating wire 303 is led out from the lead-out opening of the sealing cover 5 .

[0048] The terminal block includes a terminal and a rivet. The heating wire 303 extends from the lead opening of the cover 5 and passes through the terminal block. A portion of the rivet is sheathed around the terminal block, while the other end is riveted to the cover 5 via a rivet. The rivet secures the rivet to the cover 5 via the rivet to achieve mechanical fixation and electrical continuity. The terminal block is a ceramic terminal block.

[0049] The surface of the panel 1 is provided with an anodized layer.

[0050] The NTC sensor includes an end cap 6, a thermistor 7, a return spring 9 and a positioning piece 8. The pins of the thermistor 7 extend through the positioning piece 8 and extend out of the recess 501. The lower end of the end cap 6 is provided with a support foot, and the return spring 9 is sleeved on the support foot. The lower side of the return spring 9 contacts the bottom surface of the recess 501. The positioning piece 8 fixes the thermistor 7 to the inner cavity of the end cap 6.

[0051] When the pot is placed on the heating plate, the pot body presses the end cover 6 due to its own weight, and the end cover 6 presses the return spring 8 to realize the pressure detection of the pot body. The thermistor 7 contacts the end cover 6 to realize real-time temperature monitoring. The end cover is a metal end cover.

[0052] In this case, the diameter of the through holes corresponding to the NTC sensors in the heating core board, the upper insulating mica sheet 2, and the lower insulating mica sheet 4 is more than 20% larger than the diameter of the through holes in the cover to prevent the NTC sensors from accidentally contacting the heating core board.

[0053] The NTC thermistor outputs a signal through the pin and is connected to the main control circuit (such as a thermostat or MCU) to monitor the temperature of the pot in real time.

[0054] Control logic: When the temperature exceeds the threshold, the main control circuit cuts off the power supply or reduces the power to achieve automatic temperature control. The power supply and the heating component are directly connected to the heating component through a power cord via 220V / 50Hz AC, and the on and off is controlled by a relay switch.

[0055] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An NTC electric cooking device, characterized by: The pot body, power supply and heating plate assembly, the heating plate assembly includes a panel, a heating component, an upper insulating mica sheet, a lower insulating mica sheet and a cover, the upper insulating mica sheet, the heating component and the lower insulating mica sheet are sequentially sealed and pressed tightly against the inner wall of the panel. An inner hole is provided in the middle of the panel, and the NTC sensor passes through the heating panel, the heating component, the upper insulating mica sheet, the lower insulating mica sheet and is fixedly connected to the cover. The upper surface of the NTC sensor abuts against the lower surface of the pot body. The outer periphery of the panel is provided with a reinforcement edge, and the inner hole of the panel is provided with a positioning column extending axially downward. The heating component, the upper insulating mica sheet, and the lower insulating mica sheet are provided with through holes corresponding to the NTC sensor; The cover is fixedly connected to the panel, a recess is provided in the middle of the cover corresponding to the inner hole, the NTC sensor is fixed in the inner hole and the recess, the positioning post passes through the recess, and the pin of the NTC sensor passes through the recess; The power supply is electrically connected to the heating plate assembly.

2. The NTC electric cooking device according to claim 1, characterized in that: The heating component is a heating wire reel, which is formed by a horizontally laid heating wire, with the starting end and the ending end adjacent to each other, and is provided with a connector. The connector is distributed to connect the starting end, the ending end, and passes through the lower insulating mica sheet to connect with the wiring terminal outside the cover.

3. The NTC electric cooking device according to claim 1, characterized in that: The heating component includes a heating core board, and the upper insulating mica sheet and the lower insulating mica sheet are located above and below the heating core board. The heating core board includes a first mica sheet and a second mica sheet. The first mica sheet and the second mica sheet are adapted to the shape of the panel. Several slots are arranged around the first mica sheet and the second mica sheet. The heating wire is wound into from the upper part of the first mica sheet, continuously wound in the slot, led out from the upper part of the second mica sheet, and passed through the lower insulating mica sheet, the cover and the terminal.

4. The NTC electric cooking device according to claim 3, characterized in that: The spacings between the plurality of card slots are the same.

5. The NTC electric cooking device according to claim 3, characterized in that: The difference in the spacing between the plurality of card slots is less than 5% to 20% of the spacing.

6. An NTC electric cooking device according to claim 2 or 3, characterized in that: The lower insulating mica sheet is provided with a lead-out opening corresponding to the heating wire, and the heating wire is led out from the lead-out opening of the cover.

7. The NTC electric cooking device according to claim 1, characterized in that: The terminal comprises a terminal and a rivet piece. The heating wire is led out from the lead opening of the cover and penetrates into the terminal. A portion of the rivet piece is sleeved on the terminal, and the other end is riveted and fixed to the cover by a rivet.

8. The NTC electric cooking device according to claim 1, characterized in that: The surface of the panel is provided with an anodized layer.

9. The NTC electric cooking device according to claim 1, characterized in that: The NTC sensor includes an end cap, a thermistor, a reset spring and a positioning piece. The pins of the thermistor extend through the positioning piece and extend out of the recess. A support leg is provided at the lower end of the end cap. The reset spring is sleeved on the support leg. The lower side of the reset spring contacts the bottom surface of the recess. The positioning piece fixes the thermistor to the inner cavity of the end cap.

10. The NTC electric cooking device according to claim 1, characterized in that: The positioning post passes through the concave position and bends to fix the cover and the panel. The outer periphery of the cover is provided with a reinforcement edge, and the outer periphery of the cover is fixed with the outer periphery of the panel by curling.

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