CN111795539A - Method for controlling heating and anti-frosting of electric air door device of refrigerator - Google Patents
Method for controlling heating and anti-frosting of electric air door device of refrigerator Download PDFInfo
- Publication number
- CN111795539A CN111795539A CN202010766594.2A CN202010766594A CN111795539A CN 111795539 A CN111795539 A CN 111795539A CN 202010766594 A CN202010766594 A CN 202010766594A CN 111795539 A CN111795539 A CN 111795539A
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- Prior art keywords
- air door
- electric air
- heating
- refrigerator
- direct current
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
- F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/04—Preventing the formation of frost or condensate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
- Refrigerator Housings (AREA)
Abstract
A method for controlling the electric air door of refrigerator to prevent frosting by heating features that when the electric air door is in static state, a CPU is controlled by computer program to output a group of code groups from output pin of MCU, and a DC drive circuit is used to drive two winding coils or one of them of electric air door motor to be heated by DC. The method has the advantages of obvious anti-frosting effect, low power consumption and low cost.
Description
Technical Field
The invention relates to the technical field of electric air door anti-frosting of a refrigerator, in particular to a method for controlling heating anti-frosting of an electric air door device of the refrigerator.
Background
The electric air door is widely used in air-cooled frostless refrigerators, freezers and the like as a temperature control executing element, and the air door baffle is opened and closed to control the flow of cold air so as to control the temperature in the refrigerator. The electric air door device driven by the stepping motor has the advantage that the opening and closing of the air door can be realized by controlling the positive and negative rotation of the motor through controlling the pulse phase sequence without a position detection device, so that the electric air door device is widely applied. Chinese patent CN2419556Y "step electric air door for refrigerator" discloses an electric air door device driven by a step motor, wherein a step motor 8 is decelerated by a four-stage gear, and finally drives a sector gear 10, thereby driving a door panel 2 to move. The stepping motor generally adopts a two-phase two-pole miniature permanent magnet stepping motor, and an alternating magnetic field is generated by sequentially applying pulse currents with different polarities to two groups of coils to drive a permanent magnet rotor to rotate.
The working environment of the electric air door for the refrigerator has the conditions that the temperature is continuously alternated, the temperature is alternatively higher than 0 ℃ and lower than 0 ℃, the air humidity is continuously alternated, and the humidity is sometimes supersaturated to generate condensation or frost. If the cold motorized damper is exposed to moist and relatively hot air, moisture from the air may condense on the solid surfaces, creating condensation and frost. This may lead to malfunction or even failure of the motorized damper.
Chinese patent CN204372122U "gear box assembly of electric air door with sealing performance" discloses an electric air door assembly structure for preventing water vapor from entering the gear box, but the structure fails to prevent water vapor from entering the lead of the stepping motor and the output shaft of the electric air door. Chinese patent CN104154240A "door pivot mechanism of electric air door with sealing performance" discloses an axle pivot structure of electric air door for preventing water vapor from entering into gear box, which adopts multi-stage hole axle fit, but because the door pivot is relatively rotated relative to the output hole of gear box, the fit must be movable fit (clearance fit), so water vapor cannot be completely prevented from entering.
At present, the main after-sale complaints of the refrigerator with the electric air door still cause the failure of the electric air door and the temperature runaway of the refrigerator due to the fact that water vapor of the electric air door enters the gear box to frost.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for controlling the heating and anti-frosting of an electric air door device of a refrigerator by utilizing a computer program, when the electric air door is in a static state, a group of codes are sent out by the computer program and a microprocessing unit MCU (microprocessing unit), and direct current is controlled and applied to a winding coil of a stepping motor to ensure that the stepping motor generates heat, thereby achieving the purpose of preventing the condensation and frosting of the stepping motor and a gear box
The technical solution proposed by the present invention is as follows:
a method for controlling the electric air door of refrigerator by computer program to prevent frosting includes the following steps:
when the electric air door is in a state of not needing to be opened or not needing to be closed, the heating anti-frosting program of the electric air door device is converted;
d for controlling CPU slave micro control unit MCU0～D7A group of coding groups which are not alternated and are edited in advance are output by eight output pins in total;
the coding group drives two winding coils of the electric air door motor or one independent winding coil of the electric air door motor through a direct current driving circuit to be electrified for heating work.
The 1 st mode of the coding group is to control two winding coils of the motor of the electric air door to be simultaneously electrified with direct current for heating work, and the electrifying time is the interval between two adjacent actions of the electric air door. The 2 nd mode of the coding group is to control any one winding coil of two winding coils of the electric air door motor to be electrified with direct current for heating work, the electrifying time is the interval between two adjacent actions of the electric air door, and the other winding coil is not electrified with direct current. The 3 rd mode of the coding group is to control any one winding coil of two winding coils of the electric air door motor to be intermittently electrified with direct current for heating work in a curing period, the electrifying time is the interval between two adjacent actions of the electric air door, and the other winding coil is not electrified with direct current.
Compared with the prior art, the invention has the following remarkable effects:
the invention relates to a method for controlling heating and frost prevention of an electric air door device of a refrigerator, which adopts a computer program to send a group of coding groups by using an original MCU and a CPU and leads direct current to a coil winding of an air door motor through a direct current driving circuit of the air door motor to heat the coil winding, thereby achieving the obvious effect of frost prevention of the electric air door device. The method has the advantages of reliable anti-frosting, low power consumption and low cost.
Drawings
Fig. 1 is a schematic structural view of a damper motor in an electric damper device of a refrigerator.
FIG. 2 is a schematic diagram of the circuit for controlling the electric damper device of the refrigerator to prevent frost formation during heating according to the present invention.
Fig. 3 is a flowchart of a computer program utilized in the method for controlling heating and anti-frosting of the electric damper device of the refrigerator according to the present invention.
Detailed Description
The invention is illustrated in further detail by the following examples.
Referring to fig. 1 to 3, a method for preventing frosting by heating an electric damper device of a refrigerator using a computer program comprises the following steps:
when the electric air door is in a state of not needing to be opened or not needing to be closed, the heating anti-frosting program of the electric air door device is converted;
d for controlling CPU slave micro control unit MCU0～D7A group of coding groups which are not alternated and are edited in advance are output by eight output pins in total;
the coding group drives two winding coils of the electric air door motor or one independent winding coil of the electric air door motor through a direct current driving circuit to be electrified for heating work.
The 1 st mode of the coding group is to control two winding coils of the motor of the electric air door to be simultaneously electrified with direct current for heating work, and the electrifying time is the interval between two adjacent actions of the electric air door. The 2 nd mode of the coding group is to control any one winding coil of two winding coils of the electric air door motor to be electrified with direct current for heating work, the electrifying time is the interval between two adjacent actions of the electric air door, and the other winding coil is not electrified with direct current. The 3 rd mode of the coding group is to control any one winding coil of two winding coils of the electric air door motor to be intermittently electrified with direct current for heating work in a curing period, the electrifying time is the interval between two adjacent actions of the electric air door, and the other winding coil is not electrified with direct current.
The air door motor of the electric air door of the existing refrigerator adopts a two-phase two-pole miniature permanent magnet stepping motor, two groups of winding coils A and B generate alternating electromagnetic fields to drive a permanent magnet rotor to rotate, and two pins of the coil A and the coil B are respectively A1, A2, B1 and B2. The two groups of coils A and B are respectively driven by triodes Q1, Q2, Q3, Q4, Q5, Q6, Q7 and Q8, the driving voltage Vpp is 12VDC, the working voltage Vcc of the micro-control unit MCU of the refrigerator is 5VDC, and the triodes Q9, Q10, Q11 and Q12 are respectively inverters of PNP triodes Q1, Q3, Q5 and Q7. When the temperature detected by the thermistors Rt1 and Rt2 is higher than the set upper temperature limit, the air door needs to be opened to allow cold air to enter the box body for cooling; on the contrary, when the temperature detected by the thermistors Rt1 and Rt2 is lower than the set lower temperature limit, the air door needs to be closed to prevent cold air from entering the box body. The desired tank temperature can be set by means of buttons K1 and K2. When the electric air door needs to be opened or closed, a series of alternating coding sets (solidified) are output by output pins D0, D1, D2, D3, D4, D5, D6 and D7 of a micro control unit MCU of an electronic control board of the refrigerator, triodes Q1, Q2, Q3, Q4, Q5, Q6, Q7 and Q8 are alternately switched on and off, so that pulse driving voltages with certain pulse frequency and specific phase sequence are respectively applied to two groups of coil pins A1, A2, B1 and B2 of the air door motor A, B, alternating current flows through a coil winding of the air door motor A, B, an alternating magnetic field is generated by a coil inductor, an output shaft with a permanent magnet is driven to rotate reversely, the door panel is driven to be opened or closed by a speed reduction mechanism, and the temperature in the refrigerator is controlled by controlling the change of cold air volume in the refrigerator. Usually, the opening or closing process of the electric air door only needs a few seconds, and the electric air door is opened or closed once every 15 to 30 minutes, and the electric air door is in a static state in the rest time.
According to the computer program flow chart shown in fig. 3, when the electric damper is judged to be in a static state, the electric damper heating anti-frosting program is started, for example, the MCU output pins D0-D7 are made to output the 1 st code group of 0, 1, so that the triodes Q1 and Q4 are turned on, the triodes Q2 and Q3 are turned off, and the coil a is applied with the dc driving voltage Vpp in which the pin a1 is positive and the pin a2 is negative; meanwhile, the triodes Q5 and Q8 are turned on, the triodes Q6 and Q7 are turned off, the coil B applies a direct current driving voltage Vpp of which the pin B1 is positive and the pin B2 is negative, and two groups of coils of the damper motor A, B generate heat by flowing direct current.
Or the electric air door heating anti-frosting program comprises the following steps: the MCU output pins D0-D7 output the 2 nd code groups of 0, 1, 0 and 0, so that the triodes Q1 and Q4 are conducted, the triodes Q2 and Q3 are cut off, the coil A applies a direct current driving voltage Vpp with a pin A1 being positive and a pin A2 being negative, and the coil A has direct current to flow through to generate heat; the triodes Q5, Q6, Q7 and Q8 are kept off, two pins of the coil B are not electrified, and no direct current flows in the coil B. And only the A group of coils of the air door motor have direct current flowing through and generate heat, so that the temperature rise is small and the power consumption is low.
Or, the procedure of heating and anti-frosting the electric air door is as follows: the MCU output pins D0-D7 are enabled to output the 3 rd code groups alternately, the 1 st 2 minutes are 0, 1, 0 and 0, the 2 nd 2 minutes are 0, 0 and 0, and the process is repeated, a coil A is enabled to apply a direct current driving voltage Vpp with a pin A1 being positive and a pin A2 being negative every 2 minutes, no direct current driving voltage exists at an interval of 2 minutes, and the coil A intermittently has direct current flowing to generate heat; in this process, no dc current flows through coil B. And only the A group of coils of the air door motor have the DC current to intermittently flow through the air door motor to generate heat, and the power of the air door motor is 50 percent of the long-term power, so that the temperature rise is smaller and the power consumption is lower. The three modes are used for selecting electric air doors of refrigerators with different specifications.
The MCU output code group under the above four states is shown in the following table:
when the electric air door needs to be opened or closed, the heating anti-frosting program of the electric air door is automatically stopped. And the heating anti-frosting program of the electric air door is restarted until the electric air door is judged to be in the static state again.
The model of the MCU adopted in the embodiment is ATMEGA32_ TQFP 44.
When the internal resistance of each group of coils of the air door motor is 300 omega, and the driving voltage Vpp is 12V, the heating power of the two groups of coils which are electrified for a long time is less than 1W, the surface temperature rise of the air door motor can reach 27 ℃ when the two groups of coils of the air door motor are electrified for a long time, and the temperature rise of the gear box also has 5 ℃. When one group of coils is electrified for a long time, the surface temperature rise of the motor of the air door can reach 16 ℃, and the temperature rise of the gear box also has 2 ℃. When one group of coils is intermittently electrified at the duty ratio of 1:1, the surface temperature rise of the air door motor can reach 6 ℃, and the temperature rise of the gear box also has 1 ℃.
As the moisture in the humid air is firstly condensed or desublimated on the surface of the coldest object, the electric air door gear box can not be frosted in the gear box as long as the temperature of the electric air door gear box is a little higher than the temperature of other parts nearby or other objects, thereby ensuring the long-term reliable work of the electric air door. According to the environmental state of the electric air door in the refrigerator, one of the three heating methods can be adopted, a method for simultaneously and continuously heating two groups of coils is adopted in an environment with easy frosting, a method for continuously heating one group of coils is adopted in an environment with general frosting, and a method for intermittently heating one group of coils is adopted in an environment with less frosting.
Claims (4)
1. A method for preventing frosting by controlling the heating of an electric air door device of a refrigerator by adopting a computer program is characterized in that: the method comprises the following steps:
when the electric air door is in a state of not needing to be opened or not needing to be closed, the heating anti-frosting program of the electric air door device is converted;
d for controlling CPU slave micro control unit MCU0～D7A group of coding groups which are not alternated and are edited in advance are output by eight output pins in total;
the coding group drives two winding coils of the electric air door motor or one independent winding coil of the electric air door motor through a direct current driving circuit to be electrified for heating work.
2. The method for preventing frosting by heating of electric damper device of refrigerator with computer program according to claim 1, characterized in that: the 1 st mode of the coding group is to control two winding coils of the motor of the electric air door to be simultaneously electrified with direct current for heating work, and the electrifying time is the interval between two adjacent actions of the electric air door.
3. The method for preventing frosting by heating of electric damper device of refrigerator with computer program according to claim 1, characterized in that: the 2 nd mode of the coding group is to control any one winding coil of two winding coils of the electric air door motor to be electrified with direct current for heating work, the electrifying time is the interval between two adjacent actions of the electric air door, and the other winding coil is not electrified with direct current.
4. The method for preventing frosting by heating of electric damper device of refrigerator with computer program according to claim 1, characterized in that: the 3 rd mode of the coding group is to control any one winding coil of two winding coils of the electric air door motor to be intermittently electrified with direct current for heating work in a curing period, the electrifying time is the interval between two adjacent actions of the electric air door, and the other winding coil is not electrified with direct current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010766594.2A CN111795539A (en) | 2020-08-03 | 2020-08-03 | Method for controlling heating and anti-frosting of electric air door device of refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010766594.2A CN111795539A (en) | 2020-08-03 | 2020-08-03 | Method for controlling heating and anti-frosting of electric air door device of refrigerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111795539A true CN111795539A (en) | 2020-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010766594.2A Withdrawn CN111795539A (en) | 2020-08-03 | 2020-08-03 | Method for controlling heating and anti-frosting of electric air door device of refrigerator |
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| Country | Link |
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| CN (1) | CN111795539A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101144671A (en) * | 2006-09-13 | 2008-03-19 | 株式会社东芝 | Refrigerator |
| CN101334225A (en) * | 2007-06-26 | 2008-12-31 | 株式会社东芝 | Refrigeratory |
| JP2009052816A (en) * | 2007-08-28 | 2009-03-12 | Panasonic Corp | Damper device |
| CN101539359A (en) * | 2008-03-17 | 2009-09-23 | 株式会社东芝 | Refrigerator |
| CN201973990U (en) * | 2010-12-30 | 2011-09-14 | 苏州三星电子有限公司 | Frost-prevention air door structure for refrigerator |
| CN110470126A (en) * | 2018-05-09 | 2019-11-19 | 郑州宇通重工有限公司 | A kind of electrical junction box and its dehumidification system |
| CN111336751A (en) * | 2020-03-23 | 2020-06-26 | 江苏凯德电控科技有限公司 | Driving device for refrigerator air door, refrigerator air door and refrigerator |
-
2020
- 2020-08-03 CN CN202010766594.2A patent/CN111795539A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101144671A (en) * | 2006-09-13 | 2008-03-19 | 株式会社东芝 | Refrigerator |
| CN101334225A (en) * | 2007-06-26 | 2008-12-31 | 株式会社东芝 | Refrigeratory |
| JP2009052816A (en) * | 2007-08-28 | 2009-03-12 | Panasonic Corp | Damper device |
| CN101539359A (en) * | 2008-03-17 | 2009-09-23 | 株式会社东芝 | Refrigerator |
| CN201973990U (en) * | 2010-12-30 | 2011-09-14 | 苏州三星电子有限公司 | Frost-prevention air door structure for refrigerator |
| CN110470126A (en) * | 2018-05-09 | 2019-11-19 | 郑州宇通重工有限公司 | A kind of electrical junction box and its dehumidification system |
| CN111336751A (en) * | 2020-03-23 | 2020-06-26 | 江苏凯德电控科技有限公司 | Driving device for refrigerator air door, refrigerator air door and refrigerator |
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Application publication date: 20201020 |
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| WW01 | Invention patent application withdrawn after publication |