CN107327878B - Microwave oven no-load detection device and method and microwave oven - Google Patents
Microwave oven no-load detection device and method and microwave oven Download PDFInfo
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- CN107327878B CN107327878B CN201710601509.5A CN201710601509A CN107327878B CN 107327878 B CN107327878 B CN 107327878B CN 201710601509 A CN201710601509 A CN 201710601509A CN 107327878 B CN107327878 B CN 107327878B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C7/00—Stoves or ranges heated by electric energy
- F24C7/02—Stoves or ranges heated by electric energy using microwaves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C7/00—Stoves or ranges heated by electric energy
- F24C7/08—Arrangement or mounting of control or safety devices
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- General Engineering & Computer Science (AREA)
- Electric Ovens (AREA)
- Constitution Of High-Frequency Heating (AREA)
Abstract
The embodiment of the invention provides a microwave oven no-load detection device and method and a microwave oven, and belongs to the field of household appliances. The method comprises the following steps: driving a rotary disc of the microwave oven to rotate for a first time through a motor rotating shaft of the microwave oven; stopping driving the rotary disc after the first time, and detecting a first number of turns of a motor rotating shaft of the microwave oven rotating due to the inertia of the rotary disc within the first inertia time; and judging whether the microwave oven is unloaded according to the first number of turns and the first preset number of turns. The microwave oven no-load detection device and method and the microwave oven have the advantages of low cost, long service life and easy assembly.
Description
Technical Field
The invention relates to the field of household appliances, in particular to a microwave oven no-load detection device and method and a microwave oven.
Background
Microwave ovens are cooking appliances that heat themselves by absorbing microwave energy in a microwave field. The novel cooking device has the characteristics of high cooking speed, less nutrient loss of food, no open fire or oil smoke, good secondary heating effect, high thawing speed and the like, and is popular with consumers.
During the use of microwave oven products, no-load operation is allowed for a long time. The reason is that under the condition that no food is absorbed by the electromagnetic wave generated by the microwave generator, a part of the electromagnetic wave is absorbed by the microwave generator, and a part of the electromagnetic wave is consumed in the cavity, so that the microwave generator is damaged, and the door seal of the microwave oven is damaged and ignited due to high-temperature deformation.
The existing method for judging whether the microwave oven runs in a no-load mode comprises the following steps:
1. the temperature sensing device is used for detecting the temperature change in the furnace chamber to judge whether the furnace chamber runs in an idle state. The method has high cost and poor accuracy, and the existing microwave oven cavity needs to be changed for installing the detection device.
2. The ultrasonic sensor is used for transmitting and receiving reflected ultrasonic waves, so that whether the cavity of the microwave oven is in an idle state or not can be judged. The method has high idle load detection accuracy, but has high cost and complex installation, needs to change the cavity of the existing microwave oven, and has the defects of easy interference of ultrasonic waves in a microwave environment and short service life.
Therefore, the existing microwave oven has the advantages of higher no-load detection function cost, complex installation and weak applicability.
Disclosure of Invention
An object of an embodiment of the present invention is to provide an empty load detecting device and method of a microwave oven and a microwave oven, which are inexpensive, long in life and easy to assemble.
In order to achieve the above object, an embodiment of the present invention provides a method for detecting no-load of a microwave oven, including: driving a rotary disc of the microwave oven to rotate for a first time through a motor rotating shaft of the microwave oven; stopping driving the rotary disc after the first time, and detecting a first number of turns of a motor rotating shaft of the microwave oven rotating due to the inertia of the rotary disc within the first inertia time; and judging whether the microwave oven is unloaded according to the first number of turns and the first preset number of turns.
Preferably, said judging whether said microwave oven is unloaded according to said first number of turns and a first predetermined number of turns comprises: judging that the microwave oven is unloaded when the first number of turns is equal to the first preset number of turns; and judging that the microwave oven is not unloaded when the first number of turns is greater than the first preset number of turns.
Preferably, after the first time of driving the turntable of the microwave oven to rotate by the motor rotating shaft of the microwave oven, the method comprises the following steps: stopping driving the turntable, and detecting a second number of turns of a motor rotating shaft of the microwave oven rotating due to the inertia of the turntable within a second time, wherein the second time is less than the first inertia time; after the second time, when the rotation of the motor rotating shaft of the microwave oven due to the inertia of the rotating disc is not finished, the rotating disc of the microwave oven is driven by the motor rotating shaft to rotate reversely for a third time, wherein the third time is less than the first time; stopping driving the turntable after the third time, and detecting a third number of turns of the motor rotating shaft of the microwave oven rotating due to the inertia of the turntable within a second inertia time; and judging whether the microwave oven is unloaded according to the second number of turns, the second preset number of turns, the third number of turns and the third preset number of turns.
Preferably, said judging whether the microwave oven is unloaded according to the second number of turns, the second predetermined number of turns, the third number of turns and the third predetermined number of turns comprises: judging that the microwave oven is unloaded when the second number of turns is equal to the second preset number of turns and the third number of turns is equal to the third preset number of turns; and judging that the microwave oven is not unloaded when the second number of turns is greater than the second preset number of turns or the third number of turns is less than the third preset number of turns.
The embodiment of the invention also provides a microwave oven no-load detection device, which comprises: the control unit is used for driving a rotary disc of the microwave oven to rotate for a first time through a motor rotating shaft of the microwave oven and stopping driving the rotary disc after the first time; the detection unit is used for detecting a first number of turns of a motor rotating shaft of the microwave oven rotating due to the inertia of the turntable within a first inertia time after the first time; and the control unit is also used for judging whether the microwave oven is unloaded according to the first number of turns and the first preset number of turns.
Preferably, the control unit is further configured to: judging that the microwave oven is unloaded when the first number of turns is equal to the first preset number of turns; and judging that the microwave oven is not unloaded when the first number of turns is greater than the first preset number of turns.
Preferably, the detecting unit is further configured to detect a second number of revolutions of a rotating shaft of a motor of the microwave oven due to inertia of the turntable within a second time after the first time, wherein the second time is less than the first inertia time; the control unit is further configured to drive the turntable of the microwave oven to rotate in reverse for a third time through the motor rotating shaft when the rotation of the motor rotating shaft of the microwave oven due to the inertia of the turntable is not finished after the second time, and stop driving the turntable after the third time, where the third time is less than the first time; the detection unit is also used for detecting a third number of turns of the rotating shaft of the motor of the microwave oven, which are caused by the inertia of the rotating disc, in a second inertia time after the third time; and the control unit is also used for judging whether the microwave oven is unloaded according to the second number of turns, the second preset number of turns, the third number of turns and the third preset number of turns.
Preferably, the control unit is further configured to: judging that the microwave oven is unloaded when the second number of turns is equal to the second preset number of turns and the third number of turns is equal to the third preset number of turns; and judging that the microwave oven is not unloaded when the second number of turns is greater than the second preset number of turns or the third number of turns is less than the third preset number of turns.
Preferably, the detection unit is a hall detection element.
An embodiment of the present invention further provides a microwave oven, including: the microwave oven empty load detection device described above; the contact surface of the turntable and the object is in a grid shape; and the driving shaft is in a tray shape and is used for supporting the edge of the rotary disc, so that the driving shaft drives the rotary disc to rotate when rotating.
By adopting the technical scheme, the microwave oven no-load detection device, the method and the microwave oven provided by the invention judge whether the cavity of the microwave oven is in the no-load state or not by comparing the number of turns of the rotating shaft of the motor of the microwave oven caused by inertia with the preset number of turns according to the inertia principle generated by the movement of the turntable.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a flow chart of a method for detecting no-load of a microwave oven according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a method for detecting empty load of a microwave oven according to another embodiment of the present invention;
FIG. 3 is a flow chart illustrating a method for detecting empty load of a microwave oven according to another embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an empty load detection device of a microwave oven according to an embodiment of the present invention; and
fig. 5 is a schematic view of a microwave oven turntable and a driving shaft according to an embodiment of the present invention.
Description of the reference numerals
401 control unit 402 detection unit
501 turntable 502 drives a shaft.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a flowchart illustrating a method for detecting an empty load of a microwave oven according to an embodiment of the present invention. As shown in fig. 1, a method for detecting no-load of a microwave oven includes: driving a turntable of the microwave oven to rotate for a first time through a motor rotating shaft of the microwave oven (step S11); stopping driving the turntable after the first time, and detecting a first number of rotations of a motor shaft of the microwave oven due to inertia of the turntable for a first inertia time (step S12); and judging whether the microwave oven is unloaded according to the first turn number and the first preset turn number (step S13).
The invention uses the principle of the inertia of the object to carry out no-load detection. The heavier the moving object, the greater the inertia. When the detection is started, the controller sends out an instruction to enable the turntable to rotate. After the first time, stop the carousel motor work, carousel and object just can stop after still can rotating first inertia time under the inertial action of motion this moment. Because the proportion of the motor rotating shaft of the rotating disc is greatly different from that of the rotating disc, the motor rotating shaft rotates for a plurality of turns as long as the rotating disc rotates a little, and therefore, the comparison is most reasonable by using the number of turns of the motor rotating shaft. The first preset number of turns is set when leaving factory, and the first preset number of turns is the number of turns of the rotating shaft of the motor due to inertia under the condition that the driving turntable rotates for the first time when no load exists.
In addition, the embodiment of the present invention may further include: before the method of the present embodiment is performed, whether the door is closed is detected, and the microwave oven no-load detection method of the present embodiment is performed when the door is closed. And when the microwave oven is judged to be in no-load state, alarming.
Fig. 2 is a flowchart of a method for detecting no-load of a microwave oven according to another embodiment of the present invention. As shown in fig. 2, the method for detecting no-load of microwave oven includes: driving a turntable of the microwave oven to rotate for a first time through a motor rotating shaft of the microwave oven (step S21); stopping driving the turntable after the first time, and detecting a first number of rotations of a motor shaft of the microwave oven due to inertia of the turntable for a first inertia time (step S22); judging that the microwave oven is unloaded when the first number of turns is equal to the first predetermined number of turns (step S23); and judging that the microwave oven is not unloaded when the first number of turns is greater than the first preset number of turns (step S24).
As mentioned above, since the first predetermined number of turns is the number of turns of the rotating shaft of the motor due to inertia in the case that the driving turntable is rotated for the first time when no load is applied, if the first number of turns is equal to the first predetermined number of turns, it is indicated that there is no object on the turntable, and the microwave oven is no load; if the first number of turns is greater than the first predetermined number of turns, the instruction rotary disk has an object thereon and the microwave oven is not unloaded.
Fig. 3 is a flowchart of a method for detecting no-load of a microwave oven according to another embodiment of the present invention. As shown in fig. 3, the method includes: driving a turntable of the microwave oven to rotate for a first time through a motor rotating shaft of the microwave oven (step S31); stopping driving the turntable after the first time, and detecting a second number of rotations of a motor shaft of the microwave oven due to inertia of the turntable for a second time, wherein the second time is less than the first inertia time (step S32); driving the turntable of the microwave oven to rotate reversely for a third time by the motor shaft when the rotation of the motor shaft of the microwave oven due to the inertia of the turntable is not finished after the second time, wherein the third time is less than the first time (step S33); stopping driving the turntable after the third time, and rotating a motor shaft of the microwave oven for a third number of times due to inertia of the turntable within a second inertia time (step S34); and judging whether the microwave oven is unloaded according to the second number of turns, the second preset number of turns, the third number of turns and the third preset number of turns (step S35).
In order to accurately detect and shorten the detection time, when the turntable rotates due to inertia, the turntable is driven to rotate in reverse once, so that whether the microwave oven is unloaded or not can be rapidly detected, wherein the time for driving the turntable to rotate in reverse is when the turntable rotates due to inertia for a second time (the turntable stops after rotating for a first inertia time, and the second time is less than the first inertia time, namely the turntable does not stop due to inertia rotation), so that the forward force still has influence when the turntable rotates in reverse. In the embodiment of the present invention, the third time for the reverse rotation of the driving turntable should be much shorter than the first time for the initial rotation of the driving turntable. The second inertia time is the time after the driving turntable reversely rotates and the inertia turntable reversely rotates until the driving turntable stops.
Judging that the microwave oven is unloaded when a second number of turns of the rotating shaft of the motor is equal to a second preset number of turns within a second time and a third number of turns is equal to a third preset number of turns within a second inertia time; when the second number of turns is greater than a second preset number of turns or the third number of turns is less than a third preset number of turns, judging that the microwave oven does not have no load, wherein the second preset number of turns and the third preset number of turns are obtained by testing according to the method of the embodiment when the microwave oven does not have load and are set when leaving a factory, and specifically, the second preset number of turns is the number of turns of the rotating shaft of the motor due to inertia in a second time under the condition that the rotating shaft of the motor is driven to rotate for a first time when the microwave oven does not have load; the third predetermined number of revolutions is the number of revolutions of the turntable due to inertia in the event that the turntable is driven to rotate in reverse for a third time period when empty.
Fig. 4 is a schematic structural diagram of an empty load detection device of a microwave oven according to an embodiment of the present invention. As shown in fig. 4, an embodiment of the present invention further provides an empty load detection device for a microwave oven, where the detection device includes: the microwave oven comprises a control unit 401 and a detection unit 402, wherein the control unit 401 is used for driving a turntable of the microwave oven to rotate for a first time through a motor rotating shaft of the microwave oven and stopping driving the turntable after the first time; the detection unit 402 is used for detecting a first number of turns of a motor rotating shaft of the microwave oven rotating due to the inertia of the turntable within a first inertia time after the first time; the control unit 401 is further configured to determine whether the microwave oven is unloaded according to the first number of turns and the first predetermined number of turns.
Optionally, the control unit 401 is further configured to: judging that the microwave oven is unloaded when the first number of turns is equal to the first preset number of turns; and judging that the microwave oven is not unloaded when the first number of turns is greater than the first preset number of turns.
Optionally, the detecting unit 402 is further configured to detect a second number of revolutions of a rotating shaft of a motor of the microwave oven due to inertia of the turntable within a second time after the first time, wherein the second time is less than the first inertia time; the control unit 401 is further configured to control the turntable of the microwave oven to rotate reversely for a third time through the driving of the motor shaft when the rotation of the motor shaft of the microwave oven due to the inertia of the turntable is not finished after the second time, and stop driving the turntable after the third time, where the third time is less than the first time; the detecting unit 402 is further used for detecting a third number of turns of the motor rotating shaft of the microwave oven due to the inertia of the turntable within a second inertia time after the third time; the control unit 401 is further configured to determine whether the microwave oven is unloaded according to the second number of turns, the second predetermined number of turns, the third number of turns, and the third predetermined number of turns.
Optionally, the control unit 401 is further configured to: judging that the microwave oven is unloaded when the second number of turns is equal to the second preset number of turns and the third number of turns is equal to the third preset number of turns; and when the second number of turns is greater than the second preset number of turns or the third number of turns is less than the third preset number of turns, judging that the microwave oven is not unloaded.
Optionally, the detecting unit 402 is a hall detecting element.
In addition, the no-load detection device of the microwave oven can also be provided with a detection unit for detecting whether the oven door is closed or not, and also can be provided with an alarm unit which is controlled by the control unit to alarm when the microwave oven is no-load.
Fig. 5 is a schematic view of a microwave oven turntable and a driving shaft according to an embodiment of the present invention. As shown in fig. 5, an embodiment of the present invention also provides a microwave oven including: the microwave oven empty load detection device described above; the rotary table 501, the contact surface of the rotary table 501 and the object is in a grid shape; a driving shaft 502, wherein the driving shaft 502 is shaped like a tray to support the edge of the rotating disc 501, so that when the driving shaft 502 rotates, the rotating disc is driven to rotate.
To increase the accuracy of the detection, the dial 501 must reduce the friction of the rotation. The existing supporting mode of the turntable 501 is to solve the problem of turntable rotation by a rotating ring and a driving shaft, wherein the rotating ring is used as an auxiliary part, and can generate larger friction force and influence the judgment of the result. Therefore, the embodiment of the present invention removes the swivel, changes the driving shaft 502 into a tray shape, and changes the contact surface of the turntable 501 and the object into a grid shape (or the whole turntable is in a grid shape) to increase the friction force, so that the turntable 501 prevents the object from sliding during the rotation process.
By adopting the technical scheme, the microwave oven no-load detection device, the method and the microwave oven provided by the invention judge whether the cavity of the microwave oven is in the no-load state or not by comparing the number of turns of the rotating shaft of the motor of the microwave oven caused by inertia with the preset number of turns according to the inertia principle generated by the movement of the turntable.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
Those skilled in the art can understand that all or part of the steps in the method for implementing the above embodiments may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a (may be a single chip, a chip, etc.) or a processor (processor) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (10)
1. A method for detecting no-load of a microwave oven, comprising:
driving a rotary disc of the microwave oven to rotate for a first time through a motor rotating shaft of the microwave oven;
stopping driving the rotary disc after the first time, and detecting a first number of turns of a motor rotating shaft of the microwave oven rotating due to the inertia of the rotary disc within the first inertia time; and
and judging whether the microwave oven is unloaded or not according to the first number of turns and the first preset number of turns.
2. The empty load detection method of claim 1, wherein said judging whether said microwave oven is empty load according to said first number of turns and a first predetermined number of turns comprises:
judging that the microwave oven is unloaded when the first number of turns is equal to the first preset number of turns;
and judging that the microwave oven is not unloaded when the first number of turns is greater than the first preset number of turns.
3. A method for detecting no-load of a microwave oven, comprising:
driving a rotary disc of the microwave oven to rotate for a first time through a motor rotating shaft of the microwave oven;
stopping driving the turntable, and detecting a second number of turns of a motor rotating shaft of the microwave oven rotating due to inertia of the turntable within a second time, wherein the second time is less than the time from the rotation of the turntable to the stop due to the inertia;
after the second time, when the rotation of the motor rotating shaft of the microwave oven due to the inertia of the rotating disc is not finished, the rotating disc of the microwave oven is driven by the motor rotating shaft to rotate reversely for a third time, wherein the third time is less than the first time;
stopping driving the turntable after the third time, and detecting a third number of turns of the motor rotating shaft of the microwave oven rotating due to the inertia of the turntable within a second inertia time; and
and judging whether the microwave oven is unloaded according to the second number of turns, the second preset number of turns, the third number of turns and the third preset number of turns.
4. The empty load detection method of claim 3, wherein said judging whether said microwave oven is empty load according to said second number of turns, said second predetermined number of turns, said third number of turns and said third predetermined number of turns comprises:
judging that the microwave oven is unloaded when the second number of turns is equal to the second preset number of turns and the third number of turns is equal to the third preset number of turns; and
and when the second number of turns is greater than the second preset number of turns or the third number of turns is less than the third preset number of turns, judging that the microwave oven is not unloaded.
5. An empty load detecting device of a microwave oven, the detecting device comprising:
a control unit and a detection unit, wherein,
the control unit is used for driving a rotary disc of the microwave oven to rotate for a first time through a motor rotating shaft of the microwave oven and stopping driving the rotary disc after the first time;
the detection unit is used for detecting a first number of turns of a motor rotating shaft of the microwave oven rotating due to the inertia of the turntable within a first inertia time after the first time; and
the control unit is also used for judging whether the microwave oven is unloaded according to the first number of turns and the first preset number of turns.
6. The empty load detecting device of claim 5, wherein said control unit is further configured to:
judging that the microwave oven is unloaded when the first number of turns is equal to the first preset number of turns;
and judging that the microwave oven is not unloaded when the first number of turns is greater than the first preset number of turns.
7. An empty load detecting device of a microwave oven, the detecting device comprising:
a control unit and a detection unit, wherein,
the control unit is used for driving a rotary disc of the microwave oven to rotate for a first time through a motor rotating shaft of the microwave oven and stopping driving the rotary disc after the first time;
the detection unit is used for detecting a second number of turns of a rotating shaft of a motor of the microwave oven, which are caused by inertia of the rotating disc, in a second time after the first time, wherein the second time is less than the time from the rotation of the rotating disc to the stop caused by the inertia;
the control unit is further configured to drive the turntable of the microwave oven to rotate in reverse for a third time through the motor rotating shaft when the rotation of the motor rotating shaft of the microwave oven due to the inertia of the turntable is not finished after the second time, and stop driving the turntable after the third time, where the third time is less than the first time;
the detection unit is also used for detecting a third number of turns of the rotating shaft of the motor of the microwave oven, which are caused by the inertia of the rotating disc, in a second inertia time after the third time; and
the control unit is also used for judging whether the microwave oven is unloaded according to the second number of turns, the second preset number of turns, the third number of turns and the third preset number of turns.
8. The empty load detecting device of claim 7, wherein said control unit is further configured to:
judging that the microwave oven is unloaded when the second number of turns is equal to the second preset number of turns and the third number of turns is equal to the third preset number of turns; and
and when the second number of turns is greater than the second preset number of turns or the third number of turns is less than the third preset number of turns, judging that the microwave oven is not unloaded.
9. The empty load detecting device of claim 5, wherein said detecting unit is a Hall detecting element.
10. A microwave oven, characterized in that it comprises:
the microwave oven empty detection device of any one of claims 5 to 6 or the microwave oven empty detection device of any one of claims 7 to 9;
the contact surface of the turntable and the object is in a grid shape; and
the driving shaft is in a tray shape and is used for supporting the edge of the rotary disc, so that the driving shaft drives the rotary disc to rotate when rotating.
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| WO2020098164A1 (en) * | 2018-11-16 | 2020-05-22 | 广东美的厨房电器制造有限公司 | Control method for household appliance, and household appliance |
| CN111830879B (en) * | 2020-07-28 | 2022-02-25 | 广东美的厨房电器制造有限公司 | Control method, microwave cooking appliance and computer readable storage medium |
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| CN105823096A (en) * | 2015-01-27 | 2016-08-03 | 三星电子株式会社 | Cooking Apparatus and Controlling Method Thereof |
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