CN113357872B - Method and device for defrosting refrigerator evaporator and refrigerator - Google Patents
Method and device for defrosting refrigerator evaporator and refrigerator Download PDFInfo
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- CN113357872B CN113357872B CN202010152234.3A CN202010152234A CN113357872B CN 113357872 B CN113357872 B CN 113357872B CN 202010152234 A CN202010152234 A CN 202010152234A CN 113357872 B CN113357872 B CN 113357872B
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- 238000010257 thawing Methods 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 49
- 239000003507 refrigerant Substances 0.000 claims description 167
- 238000010438 heat treatment Methods 0.000 claims description 131
- 238000001816 cooling Methods 0.000 claims description 10
- 230000017525 heat dissipation Effects 0.000 claims description 10
- 230000005674 electromagnetic induction Effects 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 10
- 238000005485 electric heating Methods 0.000 description 8
- 238000004891 communication Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
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- 238000000576 coating method Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
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- 229910052742 iron Inorganic materials 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 108010053481 Antifreeze Proteins Proteins 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
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- 230000001174 ascending effect Effects 0.000 description 1
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- 238000004590 computer program Methods 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
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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
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
- F25D21/08—Removing frost by electric heating
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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
- F25D17/067—Evaporator fan units
-
- 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
- F25D21/002—Defroster control
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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)
- Defrosting Systems (AREA)
Abstract
The application relates to the technical field of refrigerators and discloses a method for defrosting an evaporator of a refrigerator, which comprises the following steps: acquiring the current working current of an evaporator fan; judging whether a defrosting mode needs to be started or not according to the normal working current of the evaporator fan and the current working current, wherein the normal working current of the evaporator fan is the working current of the fan when the surface of the evaporator is not frosted. According to the method for defrosting the refrigerator evaporator, whether the defrosting mode needs to be started is judged according to the current working current and the normal working current of the evaporator fan. The method provided by the embodiment of the disclosure improves the accuracy of judging whether the surface of the evaporator frosts, and accurately frosts the refrigerator evaporator, so that frosting is avoided, frosting is avoided or frosting is avoided, and the refrigerating efficiency of the refrigerator is improved. The application also discloses a device for defrosting the refrigerator evaporator and a refrigerator.
Description
Technical Field
The application relates to the technical field of refrigerators, and for example relates to a method and device for defrosting an evaporator of a refrigerator and the refrigerator.
Background
In the use process of the refrigerator, the surface of the evaporator has frosting phenomena of different degrees, if defrosting treatment is not timely carried out, the thickness of the frost layer on the surface of the evaporator can be gradually increased, so that the circulation speed of air flow between the air inlet and the air outlet of the evaporator can be smaller and smaller, the air flow circulation is not smooth, the refrigerating capacity is reduced, and the working efficiency of the refrigerator is lowered.
At present, a time and temperature control method is generally adopted to defrost the evaporator of the refrigerator, and comprises the steps of setting a certain defrosting period, and defrosting the evaporator by adopting an electric heating pipe after the period is reached.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art: existing methods of controlling evaporator defrosting tend to result in frosting that does not occur or that does not occur.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.
The embodiment of the disclosure provides a method and a device for defrosting an evaporator of a refrigerator and the refrigerator, so as to solve the technical problem that the existing defrosting method of the evaporator of the refrigerator has frosted or frostless defrosting.
In some embodiments, the method comprises: acquiring the current working current of an evaporator fan; judging whether a defrosting mode needs to be started or not according to the normal working current of the evaporator fan and the current working current, wherein the normal working current of the evaporator fan is the working current of the fan when the surface of the evaporator is not frosted.
In some embodiments, the apparatus comprises: an acquisition module configured to acquire a present operating current of the evaporator fan; the judging module is configured to judge whether a defrosting mode needs to be started according to the normal working current of the evaporator fan and the current working current, wherein the normal working current of the evaporator fan is the working current of the fan when the surface of the evaporator is not frosted.
In some embodiments, the apparatus comprises a processor and a memory storing program instructions, characterized in that the processor is configured to perform, when executing the program instructions, a method for defrosting a refrigerator evaporator as previously described.
In some embodiments, the refrigerator includes a device for defrosting a refrigerator evaporator as previously described.
The method and the device for defrosting the refrigerator evaporator and the refrigerator provided by the embodiment of the disclosure can realize the following technical effects:
when the surface of the evaporator of the refrigerator is frosted, the airflow flow on the surface of the evaporator is affected, and generally, the heat exchange efficiency of the evaporator is improved by increasing the working current of the evaporator fan. According to the method for defrosting the refrigerator evaporator, whether the defrosting mode needs to be started is judged according to the current working current and the normal working current of the evaporator fan. The method provided by the embodiment of the disclosure improves the accuracy of judging whether the surface of the evaporator frosts, and accurately frosts the refrigerator evaporator, so that frosting is avoided, frosting is avoided or frosting is avoided, and the refrigerating efficiency of the refrigerator is improved.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:
FIG. 1 is a schematic diagram of a method for defrosting a refrigerator evaporator provided in an embodiment of the present disclosure;
FIG. 2 is a schematic view of an evaporator according to an embodiment of the present disclosure;
FIG. 3 is a schematic view of another evaporator provided in an embodiment of the present disclosure;
FIG. 4 is a schematic structural view of an electromagnetic heating tube of an electromagnetic heating element provided in an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a coil of an electromagnetic heating element provided in an embodiment of the present disclosure;
fig. 6 is a schematic view of another apparatus for defrosting a refrigerator evaporator provided in an embodiment of the present disclosure.
Reference numerals:
1: an evaporator; 11: a heat dissipation element; 12: a refrigerant pipe; 121: a bottom refrigerant pipe; 122: an upper refrigerant pipe; 13: an electromagnetic heating element; 131: an electromagnetic heating tube; 132: a coil.
Detailed Description
So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.
The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
The term "plurality" means two or more, unless otherwise indicated.
In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.
As shown in fig. 1, an embodiment of the present disclosure provides a method for defrosting an evaporator of a refrigerator, including:
s01, acquiring the current working current of an evaporator fan;
s02, judging whether a defrosting mode needs to be started according to the normal working current and the current working current of the evaporator fan, wherein the normal working current of the evaporator fan is the working current of the fan when the surface of the evaporator is not frosted.
With the use of the refrigerator, frost layers can be condensed on the outer surface of an evaporator of the refrigerator, so that the airflow velocity on the surface of the evaporator is influenced, and the heat exchange efficiency of the evaporator is reduced. In general, the heat exchange efficiency of the evaporator is improved by increasing the operating current of the evaporator fan. In the method for defrosting the refrigerator evaporator provided by the embodiment of the disclosure, the current working current of the evaporator fan is used as the judging parameter, so that the accuracy of judging whether the defrosting mode needs to be started is improved, defrosting without or without defrosting is prevented, and the working efficiency of the refrigerator is improved.
The evaporator fan is the fan for heat exchange of the evaporator of the refrigerator. Optionally, the current of the evaporator fan may be detected in real time to obtain the current working current I of the evaporator fan, or the current of the evaporator fan may be detected every a preset time period to obtain the current working current I of the evaporator fan. Normal operating current I of evaporator fan 0 Can be obtained when the surface of the evaporator is not frosted.
Optionally, determining whether the defrosting mode needs to be started according to the normal working current and the current working current of the evaporator fan includes: and when the difference value between the current working current of the evaporator fan and the normal working current of the evaporator fan is larger than or equal to a first current threshold value and the duration time is longer than or equal to a first duration time, starting a defrosting mode.
When the current I of the evaporator fan is equal to the normal I of the evaporator fan 0 Is greater than or equal to a first current threshold K, and I-I 0 And when the duration time of the temperature sensor is more than or equal to the first duration time, starting a defrosting mode. Optionally, K is 10mA, the first time is 2min, if the current working current I of the evaporator fan and the normal working current I of the evaporator fan are 0 The difference of the temperature is larger than or equal to 10mA, and the duration time is longer than or equal to 2min, and the refrigerator is controlled to start the defrosting mode.
Optionally, the evaporator comprises: a heat dissipation element; the refrigerant pipe penetrates through the heat dissipation element; the electromagnetic heating element, including electromagnetic heating pipe and set up in the outside coil of electromagnetic heating pipe, wherein, electromagnetic heating pipe and refrigerant pipe intercommunication, and electromagnetic heating element sets up between refrigerant entry and the refrigerant export of evaporimeter, opens the defrosting mode, includes: and closing the compressor of the refrigerator, and when the closing time of the compressor is longer than or equal to the second time, starting an electromagnetic heating element of the evaporator to defrost the evaporator.
As shown in fig. 2, 4 and 5, the evaporator 1 provided in the embodiment of the present disclosure includes a heat dissipation element 11 and a refrigerant tube 12 penetrating through the heat dissipation element 11, the type of the heat dissipation element is not limited in the embodiment of the present disclosure, and may be a blown plate or a fin group formed by a plurality of fins, etc., the evaporator formed by the heat dissipation element and the refrigerant tube may be a blown plate evaporator, a tube fin evaporator as shown in fig. 2, etc., and the type of the evaporator is not limited in the embodiment of the present disclosure. The evaporator 1 provided in the embodiment of the disclosure is provided with an electromagnetic heating element 13, and an electromagnetic heating tube 131 of the electromagnetic heating element 13 is communicated with a refrigerant tube 12 of the evaporator, so that all refrigerants in the evaporator 1 can be heated.
When the evaporator 1 needs to be defrosted, the electromagnetic heating element 13 is started, the temperature of the refrigerant at the electromagnetic heating pipe 131 is increased by utilizing electromagnetic induction, after the temperature of the refrigerant at the electromagnetic heating pipe 131 is increased, the temperature difference is generated between the refrigerant and the refrigerant at the refrigerant pipe 12, and the refrigerant flows relatively, so that the electromagnetic heating element 13 continuously heats the refrigerant in the evaporator 1, and the high-temperature refrigerant flows through the whole evaporator 1, and further defrosting of the evaporator 1 is realized. According to the evaporator 1 provided by the embodiment of the disclosure, most of heat of the electromagnetic heating element 13 is used for heating the refrigerant in the evaporator 1, so that the utilization rate of heat is improved, the heat loss is reduced, and the defrosting speed is improved.
The electromagnetic heating element 13 provided by the embodiment of the disclosure has quick hot start, and is shortened by more than 60% compared with the current heating mode of the electric heating tube; meanwhile, the heat utilization rate is up to more than 90%, and the energy is saved by 30-70% compared with the current heating mode of the electric heating pipe.
The electromagnetic heating element 13 comprises an electromagnetic heating pipe 131 and a winding coil 132 arranged outside the electromagnetic heating pipe, wherein the electromagnetic heating pipe 131 is communicated with the refrigerant pipe 12 of the evaporator to form a part of a refrigerant flow pipeline of the refrigeration system; optionally, the coil 132 is disposed on the outer surface of the electromagnetic heating tube 131, but is not in direct contact with the outer surface of the electromagnetic heating tube 131, i.e. there is a gap or distance between the coil 132 and the outer surface of the electromagnetic heating tube 131, preventing unsafe heating. The coil 132 is electrified to generate an alternating magnetic field, and the electromagnetic heating tube 131 cuts the alternating magnetic force lines to generate turbulence in the tube so as to strengthen heat transfer. Optionally, the outer surface of the electromagnetic heating element 13 is provided with an electromagnetic shielding material to prevent the electromagnetic compatibility (Electromagnetic Compatibility, abbreviated as EMC) of the electromagnetic heating element 13 on the whole machine of the household appliance, and optionally, the electromagnetic shielding material may be an electromagnetic shielding coating material, which is coated on the outer surface of the electromagnetic heating element. The electromagnetic shielding material can also be an electromagnetic shielding sleeve sleeved on the outer surface of the electromagnetic heating element, and the electromagnetic shielding sleeve can be made of electromagnetic shielding plastic, intrinsic conductive high polymer or conductive fabric and the like; optionally, the outer surface of the electromagnetic heating element 13 is coated with an anti-corrosion material to prevent rust corrosion of the electromagnetic heating element 13. The coil 132 does not generate heat, has small thermal hysteresis and low thermal inertia, and the temperature of the inner wall and the outer wall of the charging barrel is consistent, so that the temperature control is accurate in real time.
Alternatively, the number of electromagnetic heating elements in a single evaporator may be one or more. The number of the electromagnetic heating elements may be one, and when the number of the electromagnetic heating elements is one, the electromagnetic heating elements can be used for a single-flow-path evaporator, and the "single-flow-path" is understood as that after refrigerant enters through a refrigerant inlet of the evaporator, the flow path is single, and the refrigerant flows out from a refrigerant outlet of the evaporator through a single path. Optionally, the electromagnetic heating tube 131 is made of iron. The iron electromagnetic heating pipe 131 cuts alternating magnetic induction lines generated by coils, so that the inner side of the iron electromagnetic heating pipe 131 generates heat, heat is transferred to a refrigerant at the position of the electromagnetic heating pipe 131, and the heat transfer effect is improved.
At present, the electric heating tube is used for defrosting, and the external defrosting layer of the evaporator is heated firstly, namely, the defrosting sequence of the electric heating tube is from outside to inside. Unlike an electric heating pipe, the electromagnetic heating element provided by the embodiment of the disclosure transfers heat of a high-temperature refrigerant in an evaporator from inside to outside, and fins of the evaporator and a frost layer of an innermost layer of the refrigerant pipe exchange heat with the high-temperature refrigerant firstly, namely, defrosting sequence is from inside to outside, so that heat loss of the high-temperature refrigerant is prevented, and the effective utilization rate of heat generated by the electromagnetic heating element is improved; the frost layer at the contact part of the evaporator surface and the fins and the refrigerant pipe begins to melt firstly, and the adhesive force of the frost layer on the evaporator surface is reduced due to the action of the gravity of the frost layer, so that the frost layer is facilitated to fall off from the evaporator surface from top to bottom. Optionally, the evaporator surface is coated with a hydrophobic coating to keep the evaporator surface dry from water, improving defrost efficiency. Optionally, the graphene coating is coated on the heat exchange surface, and has certain hydrophobicity and enhanced heat exchange capacity, so that defrosting speed is improved.
Optionally, the inner diameter of the electromagnetic heating tube 131 of the electromagnetic heating element is the same as the inner diameter of the refrigerant tube 12.
As shown in fig. 2, the electromagnetic heating pipe 131 is disposed between two sections of refrigerant pipes, that is, the electromagnetic heating pipe 131 divides the refrigerant pipe 12 into a front section of refrigerant pipe and a rear section of refrigerant pipe, that is, the front section of refrigerant pipe and the rear section of refrigerant pipe are communicated through the electromagnetic heating pipe 131. When defrosting is not needed, the refrigerant flowing through the evaporator 1 enters through the refrigerant inlet and then flows through the front refrigerant pipe, the electromagnetic heating pipe 131 and the rear refrigerant pipe in sequence. The inner diameter of the electromagnetic heating pipe 131 is the same as the inner diameter of the refrigerant pipe 12, so that the smooth flow of the refrigerant in the evaporator 1 is improved, and the heat exchange effect of the evaporator 1 is improved.
Optionally, the electromagnetic heating tube 131 is welded with the refrigerant tube 12. The connection stability of the electromagnetic heating pipe and the refrigerant pipe is improved.
Optionally, an electromagnetic heating element is disposed in a lower portion of the evaporator.
The vertical evaporator, namely the evaporator in the use state, is defined as a central line of the evaporator at one half of the height of the evaporator, the central line is taken as a boundary, the upper part of the central line is the upper part of the evaporator, and the lower part of the central line is the lower part of the evaporator. The electromagnetic heating element is arranged at the lower part of the evaporator, so that the high-temperature refrigerant heated at the electromagnetic heating element moves upwards, the low-temperature refrigerant at the refrigerant pipe runs downwards, the low-temperature refrigerant moving downwards flows to the electromagnetic heating element and is heated by the electromagnetic heating element to become high-temperature refrigerant, and the high-temperature refrigerant moves upwards, so that the electromagnetic heating element heats the refrigerant in the whole evaporator, and the uniformity and the defrosting efficiency of the electromagnetic heating element on defrosting of the evaporator are improved.
Alternatively, the electromagnetic heating element 13 is provided at the lowermost portion of the evaporator 1, i.e., the electromagnetic heating element 13 is provided at the bottom of the evaporator 1, as shown in fig. 2. Due to the action of gravity, the liquid refrigerant in the gas-liquid two-phase state refrigerant in the evaporator is positioned at the lower part of the evaporator 1, the electromagnetic heating element 13 heats the liquid refrigerant, the refrigerant absorbs heat and evaporates to rise, the rising process absorbs cold energy, namely, heat is radiated, the refrigerant after the cold energy is absorbed becomes liquid, the liquid refrigerant is liquefied and falls to the bottom of the evaporator 1, and the upper part and the lower part in the evaporator 1 form thermal circulation, so that the defrosting speed of the surface frost layer of the refrigerant pipe 12 and the heat radiating element 11 of the evaporator 1 is improved.
Optionally, the refrigerant pipe includes: a bottom refrigerant pipe; the upper refrigerant pipe is arranged at the upper part of the bottom refrigerant pipe and is communicated with the bottom refrigerant, and the electromagnetic heating pipe is directly communicated with the bottom refrigerant pipe.
As shown in fig. 3, the bottom refrigerant pipe 121 is a refrigerant pipe section provided at the bottom of the evaporator 1, and the upper refrigerant pipe 122 is a refrigerant pipe section provided at the upper portion of the bottom refrigerant pipe 121, that is, the upper refrigerant pipe 122 is another refrigerant pipe section of the refrigerant pipe 12 excluding the bottom refrigerant pipe 121. The electromagnetic heating pipe 131 is directly communicated with the bottom refrigerant pipe 121, so that the defrosting speed of the electromagnetic heating element 13 to the evaporator 1 is improved. Optionally, the bottom refrigerant pipe 121 is in linear communication with the electromagnetic heating pipe 131, that is, the bottom refrigerant pipe 121 and the electromagnetic heating pipe 131 are positioned on the same horizontal line, so that the circulation flowability of the refrigerant between the bottom refrigerant pipe 121 and the electromagnetic heating pipe 131 is improved, and further, the defrosting efficiency of the electromagnetic heating element 13 on the evaporator 1 is improved.
Optionally, the length of the bottom refrigerant pipe is smaller than the length of the straight pipe section of the upper refrigerant pipe.
As shown in fig. 3, the bottom refrigerant pipe 121 is two linear refrigerant pipe sections disposed at the bottom of the evaporator 1, and includes a first bottom refrigerant pipe and a second bottom refrigerant pipe, and the upper refrigerant pipe is composed of a plurality of linear refrigerant pipe sections and a curved pipe section connecting two adjacent linear refrigerant pipe sections. The "length of the bottom refrigerant pipe is smaller than the length of the straight pipe section of the upper refrigerant pipe" herein is understood to mean that the lengths of the first bottom refrigerant pipe and the second bottom refrigerant pipe are both smaller than the length of each straight refrigerant pipe in the upper refrigerant pipe. The bottom refrigerant pipe of the evaporator 1 is composed of a bottom refrigerant pipe 121 and an electromagnetic heating pipe 131, and when defrosting is performed, high-temperature refrigerant at the electromagnetic heating pipe 131 flows upwards through the bottom refrigerant pipe 121 and flows to the upper refrigerant pipe 122, so that the fluidity of the refrigerant in the refrigerant pipe 12 is improved, and the defrosting speed of the electromagnetic heating element 13 on the evaporator 1 is improved.
Optionally, the heat dissipation element is a fin group, and the fin group includes: the long fin group is penetrated by the bottom refrigerant pipe and the upper refrigerant pipe; and the upper refrigerant pipe penetrates through the short fin group, and the length of the long fin group is smaller than that of the short fin group.
The long fin group is penetrated by the bottom refrigerant pipe and the upper refrigerant pipe at the same time, the short fin group is penetrated by the upper refrigerant pipe only, and the length of the long fin group is smaller than that of the short fin group. As shown in fig. 3, the fins of the long fin group alternate with the fins of the short fin group, and the number of fins in the long fin group is smaller than the number of fins in the short fin group. In this way, the number of long fin groups, i.e., the number of fins through which the bottom refrigerant pipe 121 passes, is reduced. When the evaporator 1 needs to be defrosted, the refrigerant at the bottom refrigerant pipe 121 directly connected with the electromagnetic heating element 13 is heated first, and the bottom refrigerant pipe 121 and the part of fins through which the bottom refrigerant pipe passes are defrosted first. The quantity of fins penetrating through the bottom refrigerant pipe 121 is reduced, so that the heat of the refrigerant at the bottom refrigerant pipe 121 is prevented from being dissipated outwards, the effective utilization of the heat generated by the electromagnetic heating element 13 is improved, and the defrosting speed is further improved.
Optionally, the long fin group and the short fin group form a unfilled corner, and the electromagnetic heating element is arranged at the unfilled corner.
As shown in fig. 2 and 3, the electromagnetic heating element 13 is disposed at the unfilled corner portion formed by the long fin group and the short fin group, so that the evaporator 1 added with the electromagnetic heating element 13 is still a complete unit, and when the evaporator 1 is installed, no adjustment is required to other parts of the household electrical appliance, thereby improving the installation convenience of the evaporator 1.
Optionally, the electromagnetic heating tube is U-shaped, L-shaped or linear.
As shown in fig. 3, the bottom refrigerant pipe includes two parallel first bottom refrigerant pipes and second bottom refrigerant pipes, two ports of the U-shaped electromagnetic heating pipe are respectively connected with the ports of the first bottom refrigerant pipes and the ports of the second bottom refrigerant pipes, and two straight line pipe sections of the U-shaped electromagnetic heating pipe are respectively positioned on the same straight line with the first bottom refrigerant pipes and the second bottom refrigerant pipes, that is, the bottom refrigerant pipe 121 is horizontally communicated with the electromagnetic heating pipe 131, so that the circulation mobility of the refrigerant heated by the electromagnetic heating element 13 in the refrigerant pipe 12 is improved, and the defrosting efficiency of the electromagnetic heating element 13 to the evaporator 1 is improved.
The first straight pipe section of the U-shaped electromagnetic heating pipe is defined as a pipe section which is directly communicated with the first bottom refrigerant pipe, and the second straight pipe section of the U-shaped electromagnetic heating pipe is defined as a pipe section which is directly communicated with the second bottom refrigerant pipe. Optionally, the length of the first straight line pipe section is smaller than the length of the first bottom refrigerant pipe, and the length of the second straight line pipe section is smaller than the length of the second bottom refrigerant pipe, so that when the evaporator plays a role in heat exchange, the heat exchange area of the evaporator is guaranteed, and the heat exchange effect of the evaporator is guaranteed. Optionally, the length of the first straight pipe section is equal to that of the second straight pipe section, which is beneficial to improving the heating uniformity of the electromagnetic heating element on the refrigerant.
When defrosting of an evaporator of the refrigerator is required, starting a defrosting mode, wherein the defrosting mode comprises the following steps: and closing the compressor of the refrigerator, and when the closing time of the compressor is longer than or equal to the second time, starting an electromagnetic heating element of the evaporator to defrost the evaporator.
Optionally, the second duration may be 1-3min, that is, when the evaporator of the refrigerator needs to be defrosted, the compressor is controlled to be turned off, and after the duration of turning off the compressor is greater than or equal to 1-3min, the electromagnetic heating element of the evaporator is turned on to defrost the evaporator.
Optionally, the evaporator further comprises: the first solenoid valve that sets up in the refrigerant entry of evaporimeter and the second solenoid valve that sets up in the refrigerant export of evaporimeter, before opening the electromagnetic heating element of evaporimeter still include: the first solenoid valve and the second solenoid valve are closed.
When the evaporator needs to be defrosted, the first electromagnetic valve and the second electromagnetic valve are closed, and the refrigerant is intercepted in the evaporator. The refrigerant pipe of the evaporator becomes a heat pipe of common filling refrigerant with a refrigerant inlet and a refrigerant outlet closed, an electromagnetic heating element is started to heat and defrost the evaporator, the liquid refrigerant at the lower part of the evaporator absorbs heat and gasifies to transfer heat to the upper part of the evaporator through the refrigerant pipe, the ascending process absorbs cold energy and liquefies and sinks to the bottom of the evaporator, and the upper side and the lower side of the inside of the evaporator form thermal circulation, so that the heat pipe and the surface layer of a fin of the evaporator are quickly defrosted. Optionally, the first solenoid valve and the second solenoid valve are shut-off valves.
When defrosting is carried out by adopting the current electric heating pipe, the temperature in the refrigerator can be increased by the heat generated by the electric heating pipe in the heating process. Therefore, when the defrosting process is terminated at the initial stage of the operation of the refrigerating cycle process, the refrigerating load of the refrigerator is increased, and thus the load of the evaporator is increased, resulting in a decrease in the cooling efficiency of the refrigerator. The refrigerator provided by the embodiment of the disclosure is provided with the electromagnetic heating element, when defrosting is performed on the evaporator, less heat is lost and dissipated into the compartment, the temperature of the compartment is reduced, the energy consumption for recovering the temperature of the compartment after defrosting is finished is low, and the cooling efficiency of the refrigerator is ensured.
Meanwhile, the electromagnetic heating element 13 is an internal heating mode, basically has no heat loss, heat is accumulated in the electromagnetic heating tube 131, the surface temperature of the coil 132 is slightly higher than the room temperature, high-temperature protection is not needed, and the electromagnetic heating element is safe and reliable.
Optionally, the method for defrosting a refrigerator evaporator further comprises: acquiring the surface temperature of the evaporator; and judging whether the defrosting mode needs to be exited or not according to the surface temperature.
Alternatively, a temperature sensor may be provided on the surface of the evaporator, and the surface temperature of the evaporator may be detected by the temperature sensor provided on the surface of the evaporator. Alternatively, a plurality of temperature sensors may be provided at a plurality of positions on the surface of the evaporator, respectively, and whether the defrosting mode needs to be exited is determined according to the temperatures of the plurality of temperature sensors. For example, a first temperature sensor is arranged at an upper fin of the evaporator, a second temperature sensor is arranged at a middle fin of the evaporator, and a third temperature sensor is arranged at a lower fin of the evaporator, and whether the defrosting mode needs to be exited is judged according to the temperatures of the first temperature sensor, the second temperature sensor and the third temperature sensor. Here, exiting the defrost mode may be turning off the electromagnetic heating element of the evaporator.
Optionally, determining whether the defrosting mode needs to be exited according to the surface temperature includes: and when the surface temperature is greater than or equal to the first temperature threshold value and the duration is greater than or equal to the third duration, exiting the defrosting mode.
Alternatively, the first temperature threshold may be 5 ℃, and the third period of time may be 3min. And if the surface temperature of the evaporator is greater than or equal to 5 ℃ and the duration time is greater than or equal to 3min, controlling the refrigerator to exit the defrosting mode. Optionally, when the surface of the evaporator is provided with a plurality of temperature sensors, the temperatures of the plurality of temperature sensors are all greater than or equal to 5 ℃, and the duration time is greater than or equal to 3min, the refrigerator is controlled to exit the defrosting mode.
When the electromagnetic heating element provided by the embodiment of the disclosure is adopted to defrost the refrigerator, the generated heat influences the temperature of other compartments of the refrigerator, optionally, after the electromagnetic heating element stops heating, after all temperature points of the evaporator are balanced and the temperature is equalized, after about 5min, the first electromagnetic valve and the second electromagnetic valve are opened, and then the compressor is started to perform refrigeration circulation; when the temperature of the evaporator room is pulled down to be approximately equal to the temperature of the evaporator room before defrosting of the electromagnetic heating element, opening and adjusting the air door of the evaporator room to the freezing chamber, the refrigerating chamber and other rooms according to the set temperature of each room of a user, and adjusting the temperature of each room to the set temperature of the user; the temperature of the evaporator chamber is reduced and then the air door is opened in a delayed manner, so that high temperature air in the evaporator chamber can be prevented from entering other chambers, the temperature fluctuation of other chambers is increased, the quality of food is affected, and the time for pulling down the temperature of the chambers is prolonged; when each compartment reaches the user set temperature, the compressor stops working. Optionally, the refrigerator provided by the embodiment of the disclosure is a fixed-frequency refrigerator.
The embodiment of the disclosure also provides a device for defrosting an evaporator of a refrigerator, which comprises:
a current acquisition module configured to acquire a present operating current of the evaporator fan;
the defrosting judging module is configured to judge whether a defrosting mode needs to be started according to the normal working current and the current working current of the evaporator fan, wherein the normal working current of the evaporator fan is the working current of the fan when the surface of the evaporator is not frosted.
The foregoing embodiments of the method for defrosting a refrigerator evaporator may be correspondingly applied to the device for defrosting a refrigerator evaporator herein, and will not be described herein.
The disclosed embodiments also provide another apparatus for defrosting a refrigerator evaporator, comprising a processor and a memory storing program instructions, the processor being configured to execute the aforementioned method for defrosting a refrigerator evaporator when executing the program instructions.
As shown in fig. 6, an embodiment of the present disclosure provides an apparatus for defrosting a refrigerator evaporator, including a processor (processor) 100 and a memory (memory) 101. Optionally, the apparatus may further comprise a communication interface (Communication Interface) 102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other via the bus 103. The communication interface 102 may be used for information transfer. The processor 100 may invoke logic instructions in the memory 101 to perform the method for defrosting a refrigerator evaporator of the above-described embodiments.
Further, the logic instructions in the memory 101 described above may be implemented in the form of software functional units and may be stored in a computer readable storage medium when sold or used as a stand alone product.
The memory 101 is a computer readable storage medium that can be used to store a software program, a computer executable program, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 100 performs functional applications as well as data processing, i.e. implements the method for defrosting a refrigerator evaporator in the above-described embodiments, by running program instructions/modules stored in the memory 101.
The memory 101 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the storage data area may store data created according to the use of the terminal device, etc. Further, the memory 101 may include a high-speed random access memory, and may also include a nonvolatile memory.
The embodiment of the disclosure also provides a refrigerator comprising the device for defrosting the refrigerator evaporator.
The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may involve structural, logical, electrical, process, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. Moreover, the terminology used in the present application is for the purpose of describing embodiments only and is not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a," "an," and "the" (the) are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, when used in this application, the terms "comprises," "comprising," and/or "includes," and variations thereof, mean that the stated features, integers, steps, operations, elements, and/or components are present, but that the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof is not precluded. Without further limitation, an element defined by the phrase "comprising one …" does not exclude the presence of other like elements in a process, method or apparatus comprising such elements. In this context, each embodiment may be described with emphasis on the differences from the other embodiments, and the same similar parts between the various embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method sections disclosed in the embodiments, the description of the method sections may be referred to for relevance.
Those of skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. The skilled artisan may use different methods for each particular application to achieve the described functionality, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the embodiments disclosed herein, the disclosed methods, articles of manufacture (including but not limited to devices, apparatuses, etc.) may be practiced in other ways. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the units may be merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form. The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to implement the present embodiment. In addition, each functional unit in the embodiments of the present disclosure may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than that disclosed in the description, and sometimes no specific order exists between different operations or steps. For example, two consecutive operations or steps may actually be performed substantially in parallel, they may sometimes be performed in reverse order, which may be dependent on the functions involved. Each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Claims (8)
1. A method for defrosting a refrigerator evaporator, comprising:
acquiring the current working current of an evaporator fan;
judging whether a defrosting mode needs to be started according to the normal working current of the evaporator fan and the current working current, wherein the normal working current of the evaporator fan is the working current of the fan when the surface of the evaporator is not frosted,
the evaporator includes:
a heat dissipation element;
the cooling element is a fin group which comprises a long fin group and a short fin group, the bottom cooling tube and the upper cooling tube penetrate through the long fin group, and the upper cooling tube penetrates through the short fin group;
the electromagnetic heating element comprises an electromagnetic heating pipe and a coil arranged outside the electromagnetic heating pipe, wherein the electromagnetic heating pipe is communicated with the refrigerant pipe, the electromagnetic heating element is arranged between a refrigerant inlet and a refrigerant outlet of the evaporator, the evaporator also comprises a first electromagnetic valve arranged at the refrigerant inlet of the evaporator and a second electromagnetic valve arranged at the refrigerant outlet of the evaporator, the electromagnetic heating element is arranged at the lowest part of the evaporator, the long fin group and the short fin group form a corner-lacking part, the electromagnetic heating element is arranged at the corner-lacking part,
the turning on of the defrosting mode comprises:
and closing the compressor of the refrigerator, closing the first electromagnetic valve and the second electromagnetic valve when the closing time of the compressor is longer than or equal to the second time, opening the electromagnetic heating element, and utilizing electromagnetic induction to enable the temperature of the refrigerant at the electromagnetic heating pipe to rise, wherein after the temperature of the refrigerant at the electromagnetic heating pipe rises, the temperature difference is generated between the temperature of the refrigerant at the electromagnetic heating pipe and the temperature of the refrigerant at the refrigerant pipe, and the temperature difference and the refrigerant flow relatively, so that the electromagnetic heating element continuously heats the refrigerant in the evaporator, and the high-temperature refrigerant flows through the whole evaporator to defrost the evaporator.
2. The method of claim 1, wherein determining whether a defrost mode is required to be activated based on a normal operating current of the evaporator fan and the current operating current comprises:
and when the difference value between the current working current of the evaporator fan and the normal working current of the evaporator fan is larger than or equal to a first current threshold value and the duration time is longer than or equal to a first duration time, starting a defrosting mode.
3. The method as recited in claim 1, further comprising:
acquiring the surface temperature of the evaporator;
and judging whether the defrosting mode needs to be exited or not according to the surface temperature.
4. A method according to claim 3, wherein said obtaining the surface temperature of the evaporator comprises:
the temperature of an upper fin provided to the evaporator is obtained.
5. A method according to claim 3, wherein determining whether a defrost mode is required to be exited based on the surface temperature comprises:
and when the surface temperature is greater than or equal to a first temperature threshold value and the duration is greater than or equal to a third duration, exiting the defrosting mode.
6. A device for defrosting a refrigerator evaporator, comprising:
a current acquisition module configured to acquire a present operating current of the evaporator fan;
a defrosting judging module configured to judge whether a defrosting mode is required to be started according to a normal working current of the evaporator fan and the current working current, wherein the normal working current of the evaporator fan is a working current of the fan when no frost is formed on the surface of the evaporator,
the evaporator includes:
a heat dissipation element;
the cooling element is a fin group which comprises a long fin group and a short fin group, the bottom cooling tube and the upper cooling tube penetrate through the long fin group, and the upper cooling tube penetrates through the short fin group;
the electromagnetic heating element comprises an electromagnetic heating pipe and a coil arranged outside the electromagnetic heating pipe, wherein the electromagnetic heating pipe is communicated with the refrigerant pipe, the electromagnetic heating element is arranged between a refrigerant inlet and a refrigerant outlet of the evaporator, the evaporator also comprises a first electromagnetic valve arranged at the refrigerant inlet of the evaporator and a second electromagnetic valve arranged at the refrigerant outlet of the evaporator, the electromagnetic heating element is arranged at the lowest part of the evaporator, the long fin group and the short fin group form a corner-lacking part, the electromagnetic heating element is arranged at the corner-lacking part,
the turning on of the defrosting mode comprises:
and closing the compressor of the refrigerator, closing the first electromagnetic valve and the second electromagnetic valve when the closing time of the compressor is longer than or equal to the second time, opening the electromagnetic heating element, and utilizing electromagnetic induction to enable the temperature of the refrigerant at the electromagnetic heating pipe to rise, wherein after the temperature of the refrigerant at the electromagnetic heating pipe rises, the temperature difference is generated between the temperature of the refrigerant at the electromagnetic heating pipe and the temperature of the refrigerant at the refrigerant pipe, and the temperature difference and the refrigerant flow relatively, so that the electromagnetic heating element continuously heats the refrigerant in the evaporator, and the high-temperature refrigerant flows through the whole evaporator to defrost the evaporator.
7. An apparatus for defrosting a refrigerator evaporator comprising a processor and a memory storing program instructions, wherein the processor is configured to perform the method for defrosting a refrigerator evaporator according to any one of claims 1 to 5 when executing the program instructions.
8. A refrigerator comprising the device for defrosting an evaporator of a refrigerator according to claim 6 or 7.
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| CN202010152234.3A CN113357872B (en) | 2020-03-06 | 2020-03-06 | Method and device for defrosting refrigerator evaporator and refrigerator |
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| CN202010152234.3A CN113357872B (en) | 2020-03-06 | 2020-03-06 | Method and device for defrosting refrigerator evaporator and refrigerator |
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| CN106152641A (en) * | 2016-07-01 | 2016-11-23 | 谷振宇 | Air-conditioning refrigerator accurately defrosts intelligent control method and system |
| CN107525309A (en) * | 2016-06-17 | 2017-12-29 | 松下知识产权经营株式会社 | Evaporator, the Defrost method of evaporator and the cooling device using the evaporator |
| CN110360708A (en) * | 2019-06-06 | 2019-10-22 | 青岛海尔空调电子有限公司 | A kind of method, apparatus and air-conditioner outdoor unit for realizing defrosting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE202013006214U1 (en) * | 2012-11-30 | 2014-03-03 | Bundy Refrigeration International Holding B.V. | heat exchangers |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525309A (en) * | 2016-06-17 | 2017-12-29 | 松下知识产权经营株式会社 | Evaporator, the Defrost method of evaporator and the cooling device using the evaporator |
| CN106152641A (en) * | 2016-07-01 | 2016-11-23 | 谷振宇 | Air-conditioning refrigerator accurately defrosts intelligent control method and system |
| CN110360708A (en) * | 2019-06-06 | 2019-10-22 | 青岛海尔空调电子有限公司 | A kind of method, apparatus and air-conditioner outdoor unit for realizing defrosting |
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