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Electrothermal cooker

A technology of electric cooking utensils and thermistors, which can be used in household utensils, kitchen utensils, and water-boiling utensils, etc. It can solve the problems of lagging reaction speed, influence of consumers' use, and many processes, etc., and achieve good scratch resistance and wear resistance on the surface , Facilitate large-scale mass production, good process controllability

Inactive Publication Date: 2012-05-16
ZHEJIANG SUPOR ELECTRICAL APPLIANCES MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]1. NTC thermistor has a negative temperature coefficient, its resistance value decreases with the increase of temperature, its change is non-linear, difficult to control, and the accuracy is not high
[0005]2. The response speed of NTC thermistor is slow, and its response lag has reached more than 5 seconds when it is not packaged in a metal sleeve, while the existing electric cooker Generally, it is a liquid heater, and the NTC thermistor cannot be completely insulated. It needs to be covered with an insulating sleeve outside the glass package, and then inserted into a metal sleeve with one end closed, in order to directly detect the steam temperature in the pot. Due to the insulating sleeve The thermal conductivity is poor, and its heat conduction is still transmitted to the metal sleeve through the steam temperature in the pot and then passed to the NTC thermistor for control, resulting in a serious lag in the response speed in actual use, reaching more than 15 seconds, and it is impossible to realize the true temperature of the steam in the pot. precise control
[0006]3. The NTC thermistor currently used is generally glass packaged, which is prone to damage during installation, use or transportation. If it is damaged during installation, the product Without full inspection, it will lead to control problems after the product leaves the factory, which will affect the use of consumers, especially if it is damaged during use, the resistance value will change greatly and cannot be controlled, which may also pose a threat to consumer safety.
[0007]4. The components of existing NTC thermistors are generally mixed and sintered metal oxides. Because different electric cooker products require different control temperatures, the accuracy is different (including Stage control accuracy, for example, electric pressure cooker products require a more accurate resistance value at about 100 degrees, while rice cooker products require a more accurate resistance value at about 90 degrees), and for non-linear NTC thermistors, its manufacturers must Samples are produced according to the control requirements of different products, and its versatility is not wide. At the same time, the control requirements of stage precision lead to a relatively low pass rate of NTC thermistors when manufacturing products, usually about 80%.
[0008]5. Electric cooking utensils use NTC thermistor components, and the manufacturing process is relatively complicated. The metal sleeve is generally turned, with many processes and high cost. The middle of the metal sleeve is A closed deep hole for the insertion of the NTC thermistor. In order to ensure good contact and heat transfer, the aperture can only be slightly larger than the size of the NTC thermistor, which makes it difficult to insert, and the depth of the hole is relatively deep. When inserting the thermistor, it is often only Confirm whether the NTC thermistor is in place by feeling, causing many finished products to actually have the NTC thermistor not installed in place, and control problems
PTC thermistor is the abbreviation of Positive Temperature Coefficient, which means a positive temperature coefficient. Usually, PTC refers to a positive temperature coefficient thermistor, which is a typical semiconductor resistor with temperature sensitivity. When it exceeds a certain temperature, its resistance value increases with the temperature. The increase is a step performance increase. In the prior art, PTC is mostly used in the body tube temperature compensation circuit, temperature measurement and temperature control circuit, and overheating protection circuit. However, the PTC thermistor in the prior art is also packaged in the tube, which has the same complicated process. , the defect of large temperature measurement error

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Figure 3-Figure 5 The shown electric cooker is an electric pressure cooker, including a pot body and a pot cover mainly composed of an outer pot 5 and an inner pot 4, and an electric pressure cooker control circuit board 8 arranged between the pot body and the inner pot, and the pot cover includes There is a pot inner cover 6 and a middle seat 7 for fixing each part,

[0045] A barrel-shaped connection seat 8 is arranged on the middle seat 7, and the connection seat 8 is vertically inserted into the through hole of the pot cover and extends into the pot. The positive temperature coefficient thermistor 1 is printed on the base material 2 to form a temperature change detection element. An insulating layer is printed on the outer layer of the positive temperature coefficient thermistor 1, and the positive temperature coefficient thermistor is also composed of an electrode sheet 9, which is electrically connected to the temperature signal line, and the temperature signal l...

Embodiment 2

[0065] Figure 6 The electric cooker shown is different from Embodiment 1 in that the positive temperature coefficient thermistor 1 is installed in the hollow cavity of the connecting seat 8 near the end of the inner cover of the pot, and there is an upward shoulder under the connecting seat 8, and the positive temperature coefficient thermistor The sensitive resistor 1 is installed on the shoulder, the contact surface between the positive temperature coefficient thermistor 1 and the shoulder is provided with a sealing ring 11, and the positive temperature coefficient thermistor 1 is arranged at the end close to the inner cover of the pot, the steam path is short and the detection is faster more acurrate.

Embodiment 3- Embodiment 10

[0067] Figure 7 The positive temperature coefficient thermistor 1 (PTC thermistor) of the shown embodiment 3 is printed on the base material 2, and the base material 2 is metal, and the positive temperature coefficient thermistor 1 both sides are all printed insulating layers 3, and then installed on The surrounding wall of the cooking cavity of the electric cooker is preferably the upper position shown in the figure. The positive temperature coefficient thermistor 1 is on the side close to the cooking cavity of the electric cooker, and the temperature coefficient thermistor 1 is located below, which can directly detect the steam temperature in the cooking cavity 12. Carry out precise temperature control.

[0068] Figure 8 The shown embodiment 4 positive temperature coefficient thermistor 1 (PTC thermistor) is printed on the substrate 2, and the substrate 2 is metal, and the substrate is on the side close to the cooking cavity of the electric cooker. By detecting the temper...

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Abstract

The invention discloses an electrothermal cooker, which comprises a body, a temperature change detection element and a temperature control circuit, wherein the body is provided with a cooking cavity; the temperature change detection element is a positive temperature coefficient (PTC) thermal resistor; and the PTC thermal resistor is printed on the surface of a substrate in a printing way. Compared with an electrothermal cooker in the prior art, the electrothermal cooker has the advantages that: temperature is controlled by using the PTC thermal resistor, and the resistance value of the PTC thermal resistor increases along the rise of the temperature and changes linearly, so that high linearity, high reaction speed, high sensitivity and accurate pressure control are realized, the reaction speed is still within two seconds after an insulating layer is printed, and real accurate temperature control can be realized; a printing mode is adopted, so that the overall cost of the PTC thermal resistor can be reduced greatly, the process is simplified, and manufacturing is available by adopting a simple screen printing process; and meanwhile, insulation can be realized without influencing the temperature measuring accuracy by printing a very thin insulating layer, so that large-scale production is facilitated.

Description

technical field [0001] The invention belongs to the temperature control technology of an electric heating cooker. Background technique [0002] The temperature measurement and control of the electric cooker in the prior art is mainly carried out by setting an NTC thermistor on the cover to control the temperature, and its realization form is shown in the attached figure 1 As shown, the NTC thermistor is generally encapsulated by glass 2', covered with an insulating sleeve 3', leading wires 4' at both ends, and packaged as a whole in a metal sleeve 5' with one end closed, and the closed end of the metal sleeve extends into the pot. The cover and the metal sleeve transmit the temperature of the steam in the pot to the NTC thermistor, and the resistance of the thermistor changes, which is then controlled by a single-chip microcomputer. For uniform heat transfer, the NTC thermistor often needs to be packaged in the metal sleeve Inject heat-conducting silicone grease 6' to achie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A47J27/00A47J27/08A47J27/21A47J31/00A47J31/44A47J37/12A47J37/06A47J36/00
Inventor 蔡才德高晖
Owner ZHEJIANG SUPOR ELECTRICAL APPLIANCES MFG CO LTD
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