CN108720574B - Variable-voltage control method of cooking appliance and cooking appliance controlled by variable-voltage control method - Google Patents

Abstract

The invention discloses a variable-voltage control method of a cooking appliance and the cooking appliance controlled by the same, wherein the variable-voltage control method comprises the following steps: s11, controlling the cooking utensil to start up to work, and not electrifying the magnetic valve; s12, detecting preset parameters in the pot body to obtain a first detection value M1, comparing the first detection value M1 with a first preset value R1, controlling the magnetic valve to be electrified and opened after delaying for a first preset time when M1 is larger than or equal to R1, S13, detecting the preset parameters in the pot body to obtain a second detection value M2, comparing the second detection value M2 with a second preset value R2, and controlling the electrifying current of the magnetic valve to be in a closed state when M2 is smaller than or equal to R2, wherein R2 is smaller than R1; s14, detecting preset parameters in the pot body to obtain a third detection value M3, comparing the third detection value M3 with a third preset value R3, and controlling the electrifying current of the magnetic valve to open again after M3 is more than or equal to R3 and the first preset time is delayed, wherein R2 is more than R3 is more than R1. The voltage transformation control method has the advantages of simple control, high reliability and the like.

Description

Variable-voltage control method of cooking appliance and cooking appliance controlled by variable-voltage control method

Technical Field

The invention relates to the technical field of cooking appliances, in particular to a variable-voltage control method of a cooking appliance and the cooking appliance controlled by the variable-voltage control method.

Background

In the related art, when a cooking appliance works, the cooking effect can be improved by changing the internal pressure, for example, when an electric rice cooker cooks rice, the rice effect and the flatness can be improved by changing the pressure in a pot, however, the magnetic valve adopted for controlling the pressure in the pot at present has relatively poor integral tightness due to possible errors in manufacturing, assembling and the like, and further the reliability of pressure control in the pot is relatively poor.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a variable pressure control method of a cooking appliance, which is simple to control and improves the reliability of pressure control in a pot body of the cooking appliance to a certain extent through multiple variable pressure control.

The invention also provides a cooking appliance adopting the variable-voltage control method.

According to the variable-pressure control method of the cooking appliance in the embodiment of the first aspect of the invention, the cooking appliance comprises a pot body, a cover body and a magnetic valve arranged on the cover body, wherein the magnetic valve comprises a valve core, a valve body which is arranged at the top end of the valve core according to self weight and covers an opening at the top end of the valve core, and an electromagnetic coil which is matched with the valve body or the valve core in a magnetic repulsion mode in an electrified state; the variable voltage control method comprises the following steps: s11, controlling the cooking appliance to start up and work, not electrifying the electromagnetic coil, S12, detecting preset parameters in the pot body to obtain a first detection value M1, comparing the first detection value M1 with a first preset value R1, controlling the power supply circuit of the electromagnetic coil to be electrified after delaying for first preset time when M1 is larger than or equal to R1 to enable the valve body to be far away from the opening to open the opening to exhaust steam, S13, detecting the preset parameters in the pot body to obtain a second detection value M2, comparing the second detection value M2 with a second preset value R2, and controlling the electrifying current of the electromagnetic coil to enable the valve body to close the opening again when M2 is larger than or equal to R2, wherein R2 is smaller than R1; s14, detecting the preset parameters in the pot body to obtain a third detection value M3, comparing the third detection value M3 with a third preset value R3, and when M3 is larger than or equal to R3 and is delayed for a first preset time, controlling the current of the electromagnetic coil to enable the valve body to be away from the opening to reopen the opening for steam exhaust, wherein R2 is larger than R3 and smaller than R1.

According to the variable pressure control method provided by the embodiment of the invention, the magnetic valve is arranged on the cover body, a plurality of preset values are set, the detection value is compared with the preset values, the judgment is carried out according to the comparison result, and the magnetic valve is opened or closed after the control is delayed for the preset time, so that the repeated control of the pressure in the pot body can be realized, the characteristics of convenience in control of the magnetic valve, delayed control and the like can be utilized, the reliability of the pressure control of the pot body is improved, and the cooking effect of food is ensured.

According to one embodiment of the invention, the predetermined parameters comprise temperature parameters and/or pressure parameters, and therefore, the opening or closing of the magnetic valve is controlled by setting the temperature parameters, the pressure parameters or setting the temperature and the pressure parameters simultaneously and comparing the detected values of the temperature and the pressure with the preset values thereof, so that the pressure control reliability is improved.

Further, when the temperature parameter is detected, the first predetermined value is a first predetermined temperature value T1, where T1 is greater than or equal to 107 ℃ and less than or equal to 108 ℃.

Further, when the temperature parameter is detected, the second predetermined value is a second predetermined temperature value T2, where T2 is greater than or equal to 100 ℃ and less than or equal to 101 ℃.

Further, when the temperature parameter is detected, the third predetermined value is a third predetermined temperature value T3, where T3 is greater than or equal to 105 ℃ and less than or equal to 106 ℃.

Further, when the pressure parameter is detected, the first predetermined value is a first predetermined pressure value P1, wherein P1 is 130Kpa or less and 135Kpa or less.

Further, when the pressure parameter is detected, the second predetermined value is a second predetermined pressure value P2, wherein P2 is 100Kpa or less and 105Kpa or less.

Further, when the pressure parameter is detected, the third predetermined value is a third predetermined pressure value P3, wherein P3 is 120Kpa or less and 125Kpa or less.

Optionally, the first predetermined time is 5s-10 s.

According to a further embodiment of the present invention, after the end of step S12, the second predetermined time elapses before step S13 is performed.

According to a further embodiment of the present invention, after the step S13 is finished, a third predetermined time is elapsed, and then the step S14 is performed.

Optionally, the electromagnetic coil is arranged on one of the valve body and the valve core, a magnetic part is arranged on the other of the valve body and the valve core, the magnetic part is vertically opposite to the electromagnetic coil, and the electromagnetic coil interacts with the magnetic part along the vertical direction after being electrified to open or close the opening of the valve body.

Optionally, the magnetic valve is configured such that a projection of the magnetic member on a horizontal plane falls within a projection of the electromagnetic coil on a horizontal plane.

According to a further example of the present invention, the valve core is mounted on the cover, and the valve body is movably disposed at an upper end of the valve core.

According to the pressure varying control method of the cooking utensil in the embodiment of the second aspect of the invention, the cooking utensil comprises a pot body, a cover body and a magnetic valve arranged on the cover body, an opening and a valve body matched with the opening are arranged on the magnetic valve, and the pressure varying control method comprises the following steps: s1, controlling the cooking appliance to start to work, and not electrifying the magnetic valve to enable the valve body to close the opening; s2, detecting the temperature and/or pressure in the cooker body to obtain a first temperature detection value and/or a first pressure detection value, comparing the first temperature detection value and/or the first pressure detection value with a first temperature preset value and/or a first pressure preset value, and when the first temperature detection value and/or the first pressure detection value are judged to be larger than the first temperature preset value and/or the first pressure preset value, delaying the first preset time and then controlling the electrifying current of the magnetic valve to enable the valve body to be far away from the opening to open the opening for steam exhaust; s3: detecting the temperature and/or the pressure in the cooker body to obtain a second temperature detection value and/or a second pressure detection value, comparing the second temperature detection value and/or the second pressure detection value with a second temperature preset value and/or a second pressure preset value, and when the temperature and/or the pressure are judged to be smaller than the second temperature preset value and/or the second pressure preset value, delaying the first preset time and then controlling the electrifying current of the magnetic valve to enable the valve body to close the opening, wherein the second temperature preset value is smaller than the first temperature preset value, and the second pressure preset value is smaller than the first pressure preset value; s4, detecting the temperature and/or pressure in the cooker body to obtain a third temperature detection value and/or a third pressure detection value, comparing the third temperature detection value and/or the third pressure detection value with a third temperature preset value and/or a third pressure preset value, and when the third temperature detection value and/or the third pressure detection value is judged to be smaller than the third temperature preset value and/or the third pressure preset value, delaying the first preset time and then controlling the electrifying current of the magnetic valve to enable the valve body to start the opening again to open the opening for steam discharge, wherein the third temperature preset value is larger than the second temperature preset value and smaller than the first temperature preset value, and the third pressure preset value is larger than the second pressure preset value and smaller than the first pressure preset value.

According to the variable pressure control method provided by the embodiment of the invention, the opening or closing of the magnetic valve is controlled by setting the preset temperature value, the preset pressure value or simultaneously setting the preset temperature value and the preset pressure value and comparing the detected temperature and pressure values with the preset values, so that the repeated control of the pressure in the pot body is realized, and the reliability of pressure control is improved.

According to a further embodiment of the invention, said first predetermined temperature value is from 107 ℃ to 108 ℃, said first predetermined pressure value is from 130Kpa to 135 Kpa; the second preset temperature value is 100-101 ℃, and the second preset pressure value is 100-105 Kpa; the third preset temperature value is 105-106 ℃, and the third preset pressure value is 120-125 Kpa.

Optionally, the first predetermined time of delay is 5s-10 s.

According to the cooking appliance of the third aspect of the present invention, the variable voltage control method of the above embodiment is adopted for control.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a cooking appliance according to an embodiment of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a graph showing temperature and pressure changes of a pot of a cooking appliance according to an embodiment of the present invention, wherein a dotted line is a temperature change line and a straight line is a pressure change line;

fig. 4 is a flowchart of a variable pressure control method of a cooking appliance according to an embodiment of the present invention;

fig. 5 is a flowchart of a variable pressure control method of a cooking appliance according to still another embodiment of the present invention.

Reference numerals:

100: a cooking appliance;

10: a pan body;

20: a magnetic valve;

21: an opening; 22: a valve body; 23: a valve core; 24: an electromagnetic coil; 25: a magnetic member;

30: a cover body.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

A method for controlling a variable voltage of a cooking appliance according to an embodiment of the first aspect of the present invention is described below with reference to the accompanying drawings, wherein it should be noted that the cooking appliance may be an electric cooker, an electric pressure cooker, or the like.

As shown in fig. 1-5, according to an embodiment of the present invention, a method for controlling a variable pressure of a cooking appliance includes a pot, a lid, and a magnetic valve disposed on the lid, where the magnetic valve includes a valve core, a valve body, and an electromagnetic coil, a top end of the valve core is provided with an opening communicated with the inside of the pot, the valve body is disposed on a top end of the valve core and closes the opening on the top end of the valve core under a self-weight action, the electromagnetic coil may be disposed on the valve core (as shown in fig. 2), and the electromagnetic coil cooperates with the valve body in a magnetically repulsive manner to open the opening when the electromagnetic coil is in an energized state, and of course, the electromagnetic coil may also be disposed on the valve body, so that the electromagnetic coil cooperates with.

The variable voltage control method comprises the following steps:

s11, firstly, water and food materials are put into the pot body of the cooking appliance, the cooking appliance is controlled to start up to work, the pot body is heated, and at the moment, the magnetic valve is not electrified and is in a closed state.

S12, detecting preset parameters in the pot body to obtain a first detection value M1, comparing M1 with a first preset value R1, and when M1 is larger than or equal to R1, delaying for a first preset time, controlling the magnetic valve to be electrified, so that the magnetic valve generates magnetic force to be opened after being electrified, and starting pressure relief in the pot body.

S13, thirdly, after pressure relief is carried out for a period of time, the preset parameters in the pot body are changed, the preset parameters in the pot body are detected to obtain a second detection value M2, M2 is compared with a second preset value R2, when M2 is not more than R2, the electrified current of the magnetic valve is controlled to be reduced, the magnetic valve is closed again, and the second preset value R2 is smaller than the first preset value R1.

S14, fourthly, after the magnetic valve is closed again, after a period of time, the preset parameters in the pot body change again, the preset parameters in the pot body are detected to obtain a third detection value M3, at the moment, M3 is compared with a third preset value R2, when M3 is larger than or equal to R3, after the first preset time is delayed, the electrified current of the magnetic valve is controlled to be increased, the magnetic valve is opened again, the pressure in the pot body is relieved again, then the magnetic valve is always in an open state, the pressure inside and outside the pot body is balanced until the rice cooking is finished, and the third preset value R3 is larger than the second preset value R2 and smaller than the first preset value R1.

Therefore, the magnetic valve is arranged on the cover body, a plurality of preset values are set, the detection value is compared with the preset values, the judgment is carried out according to the comparison result, and then the magnetic valve is opened or closed after the control is delayed for preset time, so that the pressure in the pot body can be controlled for many times, the characteristics of convenience in control of the magnetic valve, delayed control and the like can be utilized, the reliability of pressure control is improved, and the user can be ensured to achieve the preset cooking effect to a certain extent.

According to an embodiment of the present invention, the predetermined parameter may be a single temperature parameter, a single pressure parameter, or both the temperature parameter and the pressure parameter, and those skilled in the art can adjust the predetermined parameter according to actual design requirements to ensure the reliability of the pressure control in the pot body.

In an alternative example of the invention, the first predetermined value is a first predetermined temperature value T1, T1 ≦ 108℃ when detecting the temperature parameter. In another alternative example, the second predetermined value may be a second predetermined temperature value T2, 100 ℃ ≦ T2 ≦ 101 ℃ when detecting the temperature parameter. In yet another alternative example, the third predetermined value may be a third predetermined temperature value T3, 105 ≦ T3 ≦ 106℃ when detecting the temperature parameter. In the above three alternative examples, the first predetermined temperature value T1, the second predetermined temperature value T2, and the third predetermined temperature value T3 may be individually set to the above-described ranges, respectively, as long as T2 < T3 < T1 is satisfied.

Of course, in a preferred example, the above first predetermined temperature value T1, second predetermined temperature value T2, and third predetermined temperature value T3 are simultaneously set to be respectively: t1 of more than or equal to 107 ℃, T2 of more than or equal to 108 ℃, T2 of more than or equal to 100 ℃ and T3 of more than or equal to 105 ℃, for example, a user can set the temperature T1 to 107 ℃, T2 to 100 ℃ and T3 to 105 ℃, so that the food in the pot can be ensured to be in a full boiling state, and the phenomenon that the pressure is too high due to too high temperature in the pot to influence the cooking effect of food and bring safety hidden troubles can be avoided.

In yet another alternative example of the present invention, the first predetermined value is the first predetermined pressure value P1, 130Kpa ≦ P1 ≦ 135Kpa when sensing the pressure parameter. In another alternative example, the second predetermined value may be a second predetermined pressure value P2, 100Kpa ≦ P2 ≦ 105Kpa when sensing the pressure parameter. As yet another alternative example, where a pressure parameter is sensed, the third predetermined value may be a third predetermined pressure value P3, where 120Kpa ≦ P3 ≦ 125 Kpa. In the above three alternative examples, the first predetermined pressure value P1, the second predetermined pressure value P2, and the third predetermined pressure value P3 may be individually set to the above-described ranges, respectively, as long as P2 < P3 < P1 is satisfied.

Also, in a preferred example, the above first, second and third predetermined pressure values P1, P2, P3 are simultaneously set respectively as: 130Kpa is not less than P1 and not more than 135Kpa, 100Kpa is not less than P2 and not more than 105Kpa,120Kpa is not less than P3 and not more than 125Kpa, for example, a user can set P1 to 130Kpa, P2 to 100Kpa and P3 to 120Kpa, so that the pressure in the pot body can be ensured, the food is in a full boiling state, the phenomenon that the pressure is too high due to too high pressure in the pot body to influence the cooking effect of the food and bring safety hidden troubles can be avoided.

According to an embodiment of the invention, the first preset time is 5s-10s, for example, the first preset time can be 5s, 8s or 10s, so that the stability and reliability of the detection value can be ensured, and the pressure control accuracy can be improved.

According to an embodiment of the invention, after the second step (i.e., step S12) is finished, a second predetermined time is required to pass, so that the pressure relief is performed after the magnetic valve is opened, and then the third step (i.e., step S13) is performed to implement the primary pressure variation of the pressure in the pot body, wherein the second predetermined time is the time required by the magnetic valve to be opened after being electrified until a second detection value M2 of the predetermined parameter of the pot body of the cooking appliance is less than or equal to a second predetermined value R2.

According to an embodiment of the invention, after the third step (i.e., step S13) is finished, a third predetermined time is required to pass, so that the pressure of the pot body is increased after the magnetic valve is closed, and then the fourth step (i.e., step S14) is carried out to realize secondary pressure transformation of the pressure in the pot body, wherein the third predetermined time is the time required by controlling the current of the magnetic valve to close the magnetic valve again until a third detected value M3 of the predetermined parameter of the cooking appliance pot body is greater than or equal to a third predetermined value R3.

According to an embodiment of the present invention, as shown in fig. 1 and fig. 2, an opening 21 is provided on the magnetic valve 20, and a valve body 22 is adapted to cooperate with the opening 21, when the magnetic valve 20 is not energized, the valve body 22 normally abuts against the opening 21 under the action of gravity to close the opening 21, when the magnetic valve 20 is energized, the energizing current of the magnetic valve 20 is controlled to enable the magnetic valve 20 to generate a magnetic force to overcome the gravity of the valve body 22 to open the magnetic valve 20, and at this time, the magnetic valve 20 is in an open state.

Further, as shown in fig. 1 and 2, the magnetic valve 20 further includes a valve core 23, the valve core 23 is provided with an opening 21, the valve core 23 generates a magnetic force under the power-on condition to drive the valve body 22 to float up and down to open and close the opening 21, in other words, under the power-off condition, the valve body 22 is stopped against the top end of the air guide pipe by self weight, and under the power-on condition, the valve core 23 and the valve body 22 are opposite in the up-down direction to drive the valve body 22 to float up and down.

Alternatively, one of the valve body 22 and the valve core 23 is provided with a magnetic member 25, the other is provided with an electromagnetic coil 24, the magnetic member 25 is opposite to the electromagnetic coil 24, for example, as shown in fig. 2, the valve body 22 is provided with the magnetic member 25, the valve core 23 is provided with the electromagnetic coil 24 opposite to the magnetic member, when the electromagnetic coil 24 is not electrified, only the magnetic member 25 acts on the valve core 23 and gravity, when the electromagnetic coil 24 is electrified, the electromagnetic coil 24 generates magnetic force, generates repulsive force with the magnetic member 25, overcomes the dead weight of the valve body 22, and changes the magnetic force by changing the current led into the electromagnetic coil 24, thereby realizing the precise control of the magnetic force.

In an example of the present invention, the projection of the magnetic member 25 on the horizontal plane falls into the projection of the electromagnetic coil 24 on the horizontal plane, in other words, on the premise that the electromagnetic coil 24 and the magnetic member 25 are opposite in the up-down direction, the maximum cross-sectional area of the magnetic member 25 is smaller than the cross-sectional area of the electromagnetic washer 24, so as to ensure that the direction of the magnetic force generated by the electromagnetic coil 24 is opposite to the direction of the magnetic force generated by the magnetic member 25, thereby facilitating the magnetic force control.

Specifically, in one example of the present invention, as shown in fig. 2, the valve body 23 is mounted on the cover body, and the valve body 22 is movably provided at an upper end of the valve body 23 in a vertical direction (up and down direction as shown in fig. 2).

A pressure-varying control method for a cooking apparatus according to a second aspect of the present invention is described below with reference to the accompanying drawings, wherein the cooking apparatus mainly includes a pot, a cover disposed at an open end of the pot, and a magnetic valve disposed on the cover, the magnetic valve is provided with an opening communicating with the inside of the pot and a valve body matching with the opening, the pressure-varying control method includes:

when using cooking utensil, if the user detects through the internal temperature of pot, at first, to cooking utensil's the internal water of putting into of pot and edible material, close the lid, control cooking utensil start work for the pot body is heated, and at this moment, the magnetic force valve does not circular telegram, and the valve body is at the normal end of dead weight effect under and is supported the opening.

Secondly, heating for a period of time, detecting the temperature in the pot body to obtain a first temperature detection value, comparing the first temperature detection value with a first temperature preset value, if the first temperature detection value is larger than the first temperature preset value, delaying the first preset time, controlling the magnetic valve to be electrified, enabling the magnetic valve to generate magnetic force to open the opening after being electrified, and starting pressure relief in the pot body.

Thirdly, after the pressure is released for a period of time, the temperature in the pot body changes, a second temperature detection value is obtained by detecting the temperature in the pot body, the second temperature detection value is compared with a second temperature preset value, if the first temperature detection value is smaller than the second temperature preset value, the electrified current of the magnetic valve is controlled to be reduced, the magnetic valve closes the opening again, and the second temperature preset value is smaller than the first temperature preset value.

Fourthly, after the magnetic valve is closed again, after a period of time, the temperature parameter in the pot body changes again, the temperature in the pot body is detected to obtain a third temperature detection value, at the moment, the third temperature detection value is compared with a third temperature preset value, if the third temperature detection value is larger than the third temperature preset value, after first preset time is delayed, the electrifying current of the magnetic valve is controlled to be increased to open the opening, the pressure in the pot body is released again, and then the magnetic valve is always in an open state, the pressure in and out of the pot body is balanced until cooking is finished, wherein the third temperature preset value is larger than the second temperature preset value and smaller than the first temperature preset value.

Therefore, the temperature detection value is compared with the temperature preset value by setting the plurality of temperature preset values, and the opening or closing of the magnetic valve is controlled according to the comparison result, so that the pressure in the pot body is controlled for a plurality of times, the reliability of pressure control is improved, and the preset cooking effect of a user is ensured to a certain extent.

Similarly, in other embodiments of the present invention, if the pressure in the pot body is detected and the temperature and the pressure in the pot body are detected simultaneously, the specific variable pressure control process is similar to the control process for detecting the temperature in the pot body, and thus, it can be understood by those skilled in the art.

According to an embodiment of the present invention, if the temperature is controlled, the first predetermined temperature value is 107-108 ℃, the second predetermined temperature value is 100-101 ℃, and the third predetermined temperature value is 105-106 ℃, for example, a user can set the first predetermined temperature value to 107 ℃, the second predetermined temperature value to 100 ℃, and the third predetermined temperature value to 105 ℃, so that the food material in the pot can be ensured to be in a full boiling state, and the phenomenon that the pressure is too high due to too high temperature in the pot, which affects the cooking effect of food, and brings safety hazards can be avoided.

According to another embodiment of the present invention, if the pressure is controlled, the first predetermined pressure value is 130Kpa to 135Kpa, the second predetermined pressure value is 100Kpa to 105Kpa, and the third predetermined pressure value is 120Kpa to 125Kpa, for example, the user can set the first predetermined pressure value to 130Kpa, the second predetermined pressure value to 100Kpa, and the third predetermined pressure value to 120Kpa, so as to ensure the pressure in the pot, so that the food material is in a full boiling state, and avoid the excessive pressure caused by the excessive pressure in the pot from affecting the food cooking effect and bringing safety hazards.

According to an embodiment of the invention, the first preset time is 5s-10s, for example, the first preset time can be 5s, 8s or 10s, so that the stability and reliability of the detection value can be ensured, and the pressure control accuracy can be improved.

A cooking appliance according to an embodiment of the third aspect of the present invention, which employs the variable voltage control method of the above-described embodiment, is described below.

According to the cooking appliance provided by the embodiment of the invention, the variable-voltage control method has the advantages of simplicity in control, high reliability and the like.

The variable voltage control method of the cooking appliance according to the embodiment of the present invention, the cooking appliance 100 and the like using the same for control, and the operation thereof are known to those of ordinary skill in the art and will not be described in detail herein.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (18)

1. The variable-pressure control method of the cooking appliance is characterized in that the cooking appliance comprises a pot body, a cover body and a magnetic valve arranged on the cover body, wherein the magnetic valve comprises a valve core, a valve body and an electromagnetic coil, the valve body is arranged at the top end of the valve core according to self weight and covers an opening at the top end of the valve core, and the electromagnetic coil is matched with the valve body or the valve core in a magnetic repulsion mode under the power-on state;

the variable voltage control method comprises the following steps:

s11, controlling the cooking utensil to start up, wherein the electromagnetic coil is not electrified;

s12, detecting preset parameters in the pot body to obtain a first detection value M1, comparing the first detection value M1 with a first preset value R1, and controlling the power supply circuit of the electromagnetic coil to be electrified to enable the valve body to be far away from the opening to open the opening to exhaust steam after M1 is more than or equal to R1 and the first preset time is delayed;

s13, detecting the preset parameter in the pot body to obtain a second detection value M2, comparing the second detection value M2 with a second preset value R2, and controlling the current of the electromagnetic coil to enable the valve body to close the opening again when M2 is not more than R2, wherein R2 is less than R1;

s14, detecting the preset parameters in the pot body to obtain a third detection value M3, comparing the third detection value M3 with a third preset value R3, and when M3 is larger than or equal to R3 and is delayed for a first preset time, controlling the current of the electromagnetic coil to enable the valve body to be away from the opening to reopen the opening for steam exhaust, wherein R2 is larger than R3 and smaller than R1.

2. The variable pressure control method according to claim 1, wherein the predetermined parameter comprises a temperature parameter and/or a pressure parameter.

3. The variable pressure control method according to claim 2, wherein when the temperature parameter is detected, the first predetermined value is a first predetermined temperature value T1, wherein T1 ≦ 107 ≦ 108 ℃.

4. The variable voltage control method according to claim 2, wherein the second predetermined value is a second predetermined temperature value T2 when the temperature parameter is detected, wherein T2 is greater than or equal to 100 ℃ and less than or equal to 101 ℃.

5. The variable pressure control method according to claim 2, wherein the third predetermined value is a third predetermined temperature value T3 when the temperature parameter is detected, wherein T3 ≦ 105 ≦ 106 ℃.

6. The variable pressure control method according to claim 2, wherein when the pressure parameter is detected, the first predetermined value is a first predetermined pressure value P1, wherein 130Kpa ≦ P1 ≦ 135 Kpa.

7. The variable pressure control method according to claim 2, wherein when the pressure parameter is detected, the second predetermined value is a second predetermined pressure value P2, wherein 100Kpa ≦ P2 ≦ 105 Kpa.

8. The variable pressure control method according to claim 2, wherein when the pressure parameter is detected, the third predetermined value is a third predetermined pressure value P3, wherein 120Kpa ≦ P3 ≦ 125 Kpa.

9. The variable voltage control method according to any one of claims 1-8, wherein the first predetermined time is 5s-10 s.

10. The voltage transformation control method according to any one of claims 1-8, wherein step S13 is performed after a second predetermined time has elapsed after step S12 is ended.

11. The voltage transformation control method according to any one of claims 1-8, wherein after the step S13 is finished, the step S14 is performed after a third predetermined time.

12. The variable voltage control method of a cooking appliance according to claim 1, wherein the electromagnetic coil is disposed on one of the valve body and the valve core, and a magnetic member is disposed on the other of the valve body and the valve core, the magnetic member is vertically opposite to the electromagnetic coil, and the electromagnetic coil interacts with the magnetic member in a vertical direction after being energized to open or close the opening of the valve body.

13. The variable pressure control method of a cooking appliance according to claim 12, wherein the magnetic valve is configured such that a projection of the magnetic member on a horizontal plane falls into a projection of the electromagnetic coil on a horizontal plane.

14. The variable pressure control method of a cooking appliance according to claim 1, wherein the valve body is mounted on the cover, and the valve body is movably disposed at an upper end of the valve body.

15. A pressure-variable control method of a cooking appliance is characterized in that the cooking appliance comprises a pot body, a cover body and a magnetic valve arranged on the cover body, the magnetic valve is provided with an opening and a valve body matched with the opening,

the variable voltage control method comprises the following steps:

s1, controlling the cooking appliance to start to work, and enabling the magnetic valve not to be electrified so that the valve body closes the opening;

s2, detecting the temperature and/or pressure in the cooker body to obtain a first temperature detection value and/or a first pressure detection value, comparing the first temperature detection value and/or the first pressure detection value with a first temperature preset value and/or a first pressure preset value, and when the first temperature detection value and/or the first pressure detection value are judged to be larger than the first temperature preset value and/or the first pressure preset value, delaying the first preset time and then controlling the electrifying current of the magnetic valve to enable the valve body to be far away from the opening to open the opening for steam exhaust;

s3: detecting the temperature and/or the pressure in the cooker body to obtain a second temperature detection value and/or a second pressure detection value, comparing the second temperature detection value and/or the second pressure detection value with a second temperature preset value and/or a second pressure preset value, and when the temperature and/or the pressure are judged to be smaller than the second temperature preset value and/or the second pressure preset value, delaying the first preset time and then controlling the electrifying current of the magnetic valve to enable the valve body to close the opening, wherein the second temperature preset value is smaller than the first temperature preset value, and the second pressure preset value is smaller than the first pressure preset value;

s4, detecting the temperature and/or pressure in the cooker body to obtain a third temperature detection value and/or a third pressure detection value, comparing the third temperature detection value and/or the third pressure detection value with a third temperature preset value and/or a third pressure preset value, and when the third temperature detection value and/or the third pressure detection value is judged to be larger than the third temperature preset value and/or the third pressure preset value, delaying the first preset time and then controlling the electrifying current of the magnetic valve to enable the valve body to be away from the opening again to open the opening for steam discharge, wherein the third temperature preset value is larger than the second temperature preset value and smaller than the first temperature preset value, and the third pressure preset value is larger than the second pressure preset value and smaller than the first pressure preset value.

16. The variable pressure control method according to claim 15, wherein the first predetermined temperature value is 107 ℃ -108 ℃, and the first predetermined pressure value is 130Kpa-135 Kpa;

the second temperature preset value is 100-101 ℃, and the second pressure preset value is 100-105 Kpa;

the third temperature preset value is 105-106 ℃, and the third pressure preset value is 120-125 Kpa.

17. The variable pressure control method of a cooking appliance according to claim 15, wherein the delay first predetermined time is 5s-10 s.

18. A cooking appliance characterized by being controlled by the variable pressure control method according to any one of claims 1 to 17.

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