Cooking electric appliance

An electric appliance and electromagnetic technology, which is applied to cooking utensils, kitchen utensils, household utensils, etc., can solve the problems of scratching the insulation layer, insulation performance degradation, short-circuit fire, etc., and achieves the effect of convenient installation and avoiding insulation degradation

Pending Publication Date: 2018-02-02
FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MFG CO LTD
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AI-Extracted Technical Summary

Problems solved by technology

When multi-point temperature measurement is required, multiple thermistors need to be connected to the temperature measurement system through multiple wires. The insulation performance decreases, which will lead to pote...
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Method used

Visible, in technical scheme of the present invention, because surface acoustic wave temperature sensor need not be provided with connecting lead and power supply, therefore by adopting surface acoustic wave temperature sensor and signal reader-writer 4 to cooperate detection cooking appliance (as electric cooker) The temperature inside makes it easy to install inside the cooking utensil, and at the same time, it can avoid the problems of the insulation of the wi...
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Abstract

The invention provides a cooking electric appliance, which comprises a cooking electric appliance main body, at least one acoustic surface wave temperature sensor and a signal reader-writer, wherein the at least one acoustic surface wave temperature sensor is arranged in the cooking electric appliance main body and is used for sensing the temperature of a position to be detected, and is used for receiving electromagnetic scanning signals sent by the signal reader-writer and returning the electromagnetic wave signals with the temperature signals; and the signal reader-writer is arranged in thecooking electric appliance main body and is used for sending the electromagnetic scanning signals to the at least one acoustic surface wave temperature sensor, receiving the electromagnetic wave signals returned by the at least one acoustic surface wave temperature sensor, and determining the temperature signals sensed by the at least one acoustic surface wave temperature sensor according to the electromagnetic wave signals. By using the technical scheme, a device for detecting the temperature can be conveniently arranged inside the cooking device; and meanwhile, the problem of potential safety hazard generation due to insulation layer damage or insulation performance reduction of a conducting wire caused by a temperature detection mode by a thermistor in the prior art can be solved.

Application Domain

Technology Topic

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  • Cooking electric appliance
  • Cooking electric appliance

Examples

  • Experimental program(1)

Example Embodiment

[0028] In order to be able to understand the above objectives, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the application and the features in the embodiments can be combined with each other if there is no conflict.
[0029] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Therefore, the protection scope of the present invention is not limited to the specific details disclosed below. Limitations of the embodiment.
[0030] The technical scheme of the present invention is mainly aimed at the temperature measurement method of cooking appliances, and proposes a new technical scheme. The cooking appliances applying the technical scheme are provided with a signal reader and at least one surface acoustic wave temperature sensor. Among them, the signal reader is used to send electromagnetic scanning signals to the surface acoustic wave temperature sensor, and the surface acoustic wave temperature sensor receives the electromagnetic scanning signal sent by the signal reader, and returns the electromagnetic wave signal carrying the temperature signal, and then the signal reader receives According to the electromagnetic wave signal, the temperature signal sensed by the surface acoustic wave temperature sensor is determined according to the electromagnetic wave signal.
[0031] The above-mentioned cooking appliances may be cooking appliances such as rice cookers, soymilk machines, etc. In order to elaborate on the technical scheme of the present invention, the following uses a rice cooker as an example for further explanation:
[0032] Such as figure 1 As shown, the rice cooker according to the embodiment of the present invention includes: a cooker body, a signal reader/writer 4 arranged in the cooker body, and at least one surface acoustic wave temperature sensor. The pot body includes an accommodating cavity for accommodating an inner pot 2 and an upper cover 3 covering the accommodating cavity. The inner pot 2 is used for placing an object to be heated, and the at least one surface acoustic wave temperature sensor is used for sensing the inner pot. 2 temperature. The pot body can also be provided with a control panel.
[0033] Among them, in figure 1 In the rice cooker shown, three surface acoustic wave temperature sensors are installed in the pot body, namely the surface acoustic wave temperature sensor 1a arranged on the upper cover 3, and the surface acoustic wave temperature sensor 1a arranged on the pot body in contact with the side wall of the inner pot 2. The surface acoustic wave temperature sensor 1b and the surface acoustic wave temperature sensor 1c arranged on the pot body in contact with the bottom of the inner pot 2. These three surface acoustic wave temperature sensors respectively sense the upper part, side wall and bottom of the inner pot 2. temperature.
[0034] In other embodiments of the present invention, the surface acoustic wave temperature sensor may be provided only at any one or two of the above three positions.
[0035] When multiple surface acoustic wave temperature sensors are installed in the rice cooker, the resonance frequencies of the multiple surface acoustic wave temperature sensors are different from each other, and the signal reader 4 transmits electromagnetic scanning signals of different frequency bands to obtain different surface acoustic wave temperature sensors. Electromagnetic wave signal.
[0036] Specifically, since the resonant frequencies of the multiple surface acoustic wave temperature sensors are different from each other, and the signal reader 4 transmits electromagnetic scanning signals of different frequency bands to obtain the electromagnetic wave signals returned by different surface acoustic wave temperature sensors, the signal reader 4 It can distinguish the electromagnetic wave signals sent by different surface acoustic wave temperature sensors, and then can determine the temperature of different parts to be measured.
[0037] The electromagnetic scanning signal and electromagnetic wave signal mentioned above are all radio frequency signals.
[0038] In the technical solution of the present invention, the purpose of setting the signal reader 4 is to send electromagnetic scanning signals to the surface acoustic wave temperature sensor, and to receive the electromagnetic wave signal returned by the surface acoustic wave temperature sensor, and determine the surface acoustic wave according to the electromagnetic wave signal The temperature signal sensed by the temperature sensor; the surface acoustic wave temperature sensor is used to receive the electromagnetic scanning signal sent by the signal reader 4, and return the electromagnetic wave signal carrying the temperature signal according to the electromagnetic scanning signal.
[0039] Specifically, such as figure 2 As shown, the surface acoustic wave temperature sensor according to the embodiment of the present invention includes: a first antenna (not shown in the figure), a piezoelectric substrate 11, and a first interdigital switch disposed at both ends of the piezoelectric substrate 11 The energy device 12 and the second interdigital transducer 13; among them, the first antenna is used to receive the electromagnetic scanning signal sent by the signal reader 4, and the first interdigital transducer 12 is used to receive the electromagnetic The scanning signal is converted into a surface acoustic wave signal, the piezoelectric substrate 11 is used to propagate the surface acoustic wave signal, and the second interdigital transducer 13 is used to convert the surface acoustic wave signal propagated by the piezoelectric substrate 11 into an electromagnetic wave signal, and then The first antenna then sends the electromagnetic wave signal to the signal reader 4.
[0040] As the surface acoustic wave signal propagates on the piezoelectric substrate 11, its propagation characteristics will be affected by the temperature sensed by the piezoelectric substrate 11. Specifically, the propagation characteristics (such as frequency) of the surface acoustic wave signal are linear with the temperature For example, the frequency change is proportional to the temperature change. After the second interdigital transducer 13 converts the surface acoustic wave signal propagated by the piezoelectric substrate 11 into an electromagnetic wave signal, the propagation characteristics of the electromagnetic wave signal are also Corresponding changes will occur, and the signal reader 4 can determine the temperature signal detected by the surface acoustic wave temperature sensor by analyzing the electromagnetic wave signal.
[0041] It can be seen that, in the technical scheme of the present invention, since the surface acoustic wave temperature sensor does not need to be provided with connecting wires and power supply, the surface acoustic wave temperature sensor and the signal reader 4 are used to cooperate to detect the temperature in the cooking appliance (such as a rice cooker) , So that it can be easily installed inside the cooking appliance, and at the same time, it can also avoid the problem of safety hazards caused by the decrease of the insulation of the wire or the damage of the insulation layer when the thermistor is used in the related art.
[0042] Further, as figure 1 As shown, the signal reader/writer 4 has a second antenna 41. The signal reader/writer 4 transmits electromagnetic scanning signals through the second antenna 41, and receives electromagnetic wave signals returned by the surface acoustic wave temperature sensor through the second antenna 41.
[0043] Further, as figure 1 As shown, the rice cooker further includes: a main control circuit board 5 connected to the signal reader/writer 4 for receiving the temperature signal sensed by the at least one surface acoustic wave temperature sensor determined by the signal reader/writer 4. Wherein, after receiving the temperature signal, the main control circuit board 5 can control the operation of the rice cooker based on the temperature signal, such as adjusting the heating power and heating duration of the rice cooker. Preferably, the signal reader/writer 4 and the second antenna 41 can be arranged on the main control circuit board 5.
[0044] Further, the electric rice cooker further includes a display module (not shown in the figure), connected to the main control circuit board 5, for displaying the temperature value corresponding to the temperature signal determined by the signal reader 4.
[0045] By setting the display module to display the temperature value corresponding to the above temperature signal, the user can grasp the working status of the rice cooker, so as to control the rice cooker. In addition, the display module can also be used to display other parameters when the rice cooker is working, such as working time, working mode, etc.
[0046] The technical solution of the present invention can also be applied to other cooking appliances to detect the temperature, such as soymilk machine, induction cooker, etc., and the number and location of the surface acoustic wave temperature sensor can also be set according to the actual situation. Adjust accordingly.
[0047] The technical scheme of the present invention is described in detail above with reference to the accompanying drawings. The present invention proposes a new cooking appliance, which makes it possible to conveniently install temperature detection devices inside the cooking appliance, while also avoiding the use of thermistors in the related art. The method of detecting the temperature may cause a safety hazard due to the decrease of the insulation of the wire or the damage of the insulation layer.
[0048] The above are only preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc., made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
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Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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