阅读说明：本技术 蒸发器组件以及冰箱、冰箱的控制方法 (Evaporator assembly, refrigerator and control method of refrigerator ) 是由 李孟成 朱小兵 刘建如 费斌 王常志 于 2019-11-25 设计创作，主要内容包括：本发明提供了一种蒸发器组件,包括：蒸发器,所述蒸发器包括：供冷媒流动的蒸发管；和套装于所述蒸发管上的多个翅片,其中,所述蒸发管和/或所述翅片包含导磁材料；以及电磁感应加热丝,集成在所述蒸发器内部并贴合于至少一个所述翅片的限定出气流通道的侧面设置,所述电磁感应加热丝内部设置有导线,用于在所述导线被施加交流电后产生交变磁场,以使包含导磁材料的所述翅片和/或所述蒸发管感应升温以对所述蒸发器进行化霜。本发明的蒸发器组件的结构紧凑、占用体积小,且化霜效率和电效率高,非常适合风冷冰箱的应用场景。本发明还提供一种具有该蒸发器组件的冰箱的控制方法和冰箱。(The present invention provides an evaporator assembly comprising: an evaporator, the evaporator comprising: an evaporation tube for flowing a refrigerant; the evaporation tube is sleeved with a plurality of fins, wherein the evaporation tube and/or the fins comprise magnetic conductive materials; and the electromagnetic induction heating wire is integrated in the evaporator and attached to the side surface of at least one fin for limiting the air outlet channel, and a lead is arranged in the electromagnetic induction heating wire and used for generating an alternating magnetic field after alternating current is applied to the lead so as to lead the fin containing a magnetic conductive material and/or the evaporation tube to be heated up in an induction manner so as to defrost the evaporator. The evaporator assembly disclosed by the invention is compact in structure, small in occupied volume, high in defrosting efficiency and electric efficiency, and very suitable for application scenes of air-cooled refrigerators. The invention also provides a control method of the refrigerator with the evaporator assembly and the refrigerator.)

1. An evaporator assembly comprising:

an evaporator, the evaporator comprising:

an evaporation tube for flowing a refrigerant; and

the evaporation tube is sleeved with a plurality of fins, wherein the evaporation tube and/or the fins comprise magnetic conductive materials; and

the electromagnetic induction heating wire is integrated inside the evaporator and attached to the side face, limiting the air outlet channel, of at least one fin, and a lead is arranged inside the electromagnetic induction heating wire and used for generating an alternating magnetic field after alternating current is applied to the lead so that the fin and/or the evaporation tube containing magnetic conductive materials are heated up in an induction mode to defrost the evaporator.

2. The evaporator assembly of claim 1,

the electromagnetic induction heating wire is configured to: and coiling at least two turns on the side surface of the fin, so that the lead defines at least two connected loop-shaped loops.

3. The evaporator assembly of claim 2,

the wire has an entry point, a first exit point, and at least one second exit point, the second exit point being located between the entry point and the first exit point and configured to: a first section of the wire is energized to defrost the evaporator when current flows through the inflow point and the first outflow point; a second section of the wire is energized to defrost the evaporator when current flows through the inflow point and the second outflow point, wherein the first section is longer than the second section.

4. The evaporator assembly of claim 3,

the inflow point is an end point of the wire;

the first egress point is another end point of the wire;

the second outflow point is configured such that the first section defines more of a loop-like loop than the second section defines.

5. The evaporator assembly of claim 3,

the number of the electromagnetic induction heating wires is at least two, and the electromagnetic induction heating wires are respectively attached to the side faces of the at least two fins.

6. The evaporator assembly of claim 5, further comprising:

a first wire rod connecting the inflow points of the wires of the at least two electromagnetic induction heating wires so that current flows into the wires through the first wire rod and the inflow points;

the second wire rod is used for connecting the first outflow points of the wires of the at least two electromagnetic induction heating wires, so that current flows into the second wire rod after flowing out of the wires through the first outflow points; and

and the at least one third wire rod is used for respectively connecting the at least one second outflow point of the wires of the at least two electromagnetic induction heating wires, so that current flows into the third wire rod after flowing out of the wires through the second outflow points.

7. A control method of a refrigerator having the evaporator assembly of any one of claims 1 to 6,

the control method is that different parts of the lead of the electromagnetic induction heating wire are controlled to be electrified to defrost the evaporator based on one or more of the humidity of the external environment where the refrigerator is located, the door opening condition of the refrigerator, the temperature of a storage compartment of the refrigerator and the temperature of a defrosting sensor of the refrigerator.

8. The control method according to claim 7, comprising:

acquiring the humidity of the external environment where the refrigerator is located to obtain an environment humidity value;

judging whether the environment humidity value is greater than or equal to a preset humidity threshold value:

if yes, controlling all sections of the lead to be electrified so as to defrost the evaporator;

if not, controlling all or part of sections of the lead to be electrified to defrost the evaporator based on one or more of the door opening condition of the refrigerator, the temperature of the storage compartment and the temperature of the defrosting sensor.

9. The control method according to claim 8, wherein the step of controlling all or a part of the sections of the wires to be electrified to defrost the evaporator based on one or more of the condition of opening the door of the refrigerator, the temperature of the storage compartment and the temperature of the defrosting sensor comprises:

acquiring the door opening frequency of the refrigerator;

judging whether the door opening frequency is greater than or equal to a preset frequency threshold value or not;

if yes, controlling all sections of the lead to be electrified so as to defrost the evaporator;

if not, controlling all or part of sections of the lead to be electrified based on the temperature of the storage compartment and the temperature of the defrosting sensor so as to defrost the evaporator.

10. The control method according to claim 9, wherein the storage chamber is a freezing chamber, and the step of controlling all or a part of the sections of the wires to be energized to defrost the evaporator based on the temperature of the storage chamber and the temperature of the defrosting sensor comprises:

acquiring the temperature change trend of the freezing chamber;

acquiring the temperature change trend of the defrosting sensor;

judging whether the temperature change trend of the freezing chamber is an ascending trend and whether the temperature change trend of the defrosting sensor is a descending trend;

if yes, controlling all sections of the lead to be electrified so as to defrost the evaporator;

if not, controlling a part of the sections of the leads to be electrified so as to defrost the evaporator.

11. A refrigerator, comprising:

the refrigerator comprises a refrigerator body, a storage compartment and a cooling compartment, wherein the refrigerator body is internally provided with a cooling chamber positioned below and at least one storage compartment arranged above the cooling chamber;

the door body is arranged on the front side of the box body and used for opening and closing the storage compartment;

the evaporator assembly of any of claims 1-6, disposed within the cooling chamber, configured to cool an airflow entering the cooling chamber to form a cooled airflow; and

control apparatus comprising a controller and a memory, the memory having stored therein a computer program and the computer program being executed to cause the controller to perform a control method according to any one of claims 7 to 10.

Technical Field

The invention relates to the technical field of refrigeration equipment, in particular to an evaporator assembly, a refrigerator comprising the evaporator assembly and a control method of the refrigerator.

Background

After the air-cooled refrigerator runs for a long time, frost is formed on an evaporator for providing cold energy, so that the transmission of the cold energy is influenced, and the refrigerating performance of the refrigerator is reduced. In the prior art, for an air-cooled refrigerator, a defrosting heating wire is generally arranged on an evaporator of the air-cooled refrigerator. In particular, in a refrigerator equipped with a bottom-mounted refrigeration system, a defrosting heater wire (for example, an aluminum pipe heater wire) is generally provided in a horizontal evaporator. These heating wires are of the resistive type, i.e. by applying a voltage to a high-resistance wire, the resistance wire generates joule heat Q ═ I²And R, heating the fins of the evaporator and the frost on the fins by using heat generated by the resistor to realize defrosting. However, this method of defrosting using resistance heat has low electrical efficiency and a low heating rate, so that the defrosting time of the evaporator is long.

Disclosure of Invention

An object of the present invention is to provide an evaporator assembly which has a compact structure, a small occupied volume and a high defrosting efficiency and utilizes an electromagnetic field to generate a vortex effect on fins and/or evaporation tubes for defrosting.

A further object of the present invention is to provide an evaporator assembly that can provide different heating powers for different refrigerator conditions, to more specifically defrost, and to solve the problem of abnormal frosting.

In particular, the present invention provides an evaporator assembly comprising:

an evaporator, the evaporator comprising:

an evaporation tube for flowing a refrigerant; and

the evaporation tube is sleeved with a plurality of fins, wherein the evaporation tube and/or the fins comprise magnetic conductive materials; and

the electromagnetic induction heating wire is integrated in the evaporator and attached to the side face of the at least one fin, which limits the air outlet channel, and a lead is arranged in the electromagnetic induction heating wire and used for generating an alternating magnetic field after alternating current is applied to the lead so as to enable the fin and/or the evaporation tube containing the magnetic conductive material to be heated up in an induction mode to defrost the evaporator.

Optionally, the electromagnetic induction heating wire is configured to: and coiling at least two circles on the side surface of the fin so that the lead defines at least two connected circle-shaped loops.

Optionally, the wire has an entry point, a first exit point, and at least one second exit point, the second exit point being located between the entry point and the first exit point and configured to: while current flows through the inflow point and the first outflow point, the first section of the wire is energized to defrost the evaporator; when current flows through the inflow point and the second outflow point, a second section of the wire is energized to defrost the evaporator, wherein the first section is longer than the second section.

Optionally, the inflow point is an end point of the wire;

the first outflow point is the other end point of the wire;

the second outflow point is configured such that the first section defines more of a loop-like circuit than the second section defines.

Optionally, the number of the electromagnetic induction heating wires is at least two, and the electromagnetic induction heating wires are respectively attached to the side surfaces of the at least two fins.

Optionally, the evaporator assembly further comprises:

the first wire rod connects the inflow points of the wires of the at least two electromagnetic induction heating wires, so that current flows into the wires through the first wire rod and the inflow points;

the second wire rod is used for connecting first outflow points of the wires of the at least two electromagnetic induction heating wires, so that the current flows into the second wire rod after flowing out of the wires through the first outflow points; and

and the at least one third wire rod is used for respectively connecting at least one second outflow point of the wires of the at least two electromagnetic induction heating wires so as to enable the current to flow into the third wire rod after flowing out of the wires through the second outflow point.

The invention also provides a control method of the refrigerator, the refrigerator is provided with the evaporator assembly, and the control method is based on one or more of the humidity of the external environment where the refrigerator is located, the door opening condition of the refrigerator, the temperature of the storage chamber of the refrigerator and the temperature of a defrosting sensor of the refrigerator, so that different parts of the lead of the electromagnetic induction heating wire are controlled to be electrified to defrost the evaporator.

Optionally, the control method of the refrigerator includes:

acquiring the humidity of the external environment where the refrigerator is located to obtain an environment humidity value;

judging whether the environmental humidity value is greater than or equal to a preset humidity threshold value:

if yes, electrifying all sections of the control lead to defrost the evaporator;

if not, all or part of sections of the control wires are electrified to defrost the evaporator based on one or more of the door opening condition of the refrigerator, the temperature of the storage compartment and the temperature of the defrosting sensor.

Optionally, the step of controlling all or part of the sections of the wires to be electrified to defrost the evaporator based on one or more of the condition of opening the door of the refrigerator, the temperature of the storage compartment and the temperature of the defrosting sensor comprises:

acquiring the door opening frequency of the refrigerator;

judging whether the door opening frequency is greater than or equal to a preset frequency threshold value or not;

if yes, electrifying all sections of the control lead to defrost the evaporator;

if not, all or partial sections of the lead are electrified to defrost the evaporator based on the temperature of the storage compartment and the temperature of the defrosting sensor.

Optionally, the storage compartment is a freezing compartment, and the step of controlling all or a part of the section of the wire to be electrified to defrost the evaporator based on the temperature of the storage compartment and the temperature of the defrosting sensor comprises:

acquiring the temperature change trend of the freezing chamber;

acquiring the temperature change trend of the defrosting sensor;

judging whether the temperature change trend of the freezing chamber is an ascending trend and whether the temperature change trend of the defrosting sensor is a descending trend;

if yes, electrifying all sections of the control lead to defrost the evaporator;

if not, part of the section of the control lead is electrified to defrost the evaporator.

The present invention also provides a refrigerator including:

the refrigerator comprises a refrigerator body, a storage compartment and a cooling compartment, wherein the refrigerator body is internally limited with a cooling chamber positioned at the lower part and at least one storage compartment arranged above the cooling chamber;

the door body is arranged on the front side of the box body and used for opening and closing the storage compartment;

the evaporator assembly is disposed in the cooling chamber and configured to cool the airflow entering the cooling chamber to form a cooled airflow; and

a control apparatus comprising a controller and a memory, the memory having stored therein a computer program, and the computer program being executed to cause the controller to perform the aforementioned control method.

The evaporator assembly comprises an electromagnetic induction heating wire which is integrated in the evaporator and is attached to the side surface of the fin for limiting the air outlet channel. The electromagnetic induction heating wire is internally provided with a wire, when the wire is electrified and alternating current is applied, the electromagnetic induction heating wire generates an alternating magnetic field, so that eddy current is generated in the fins and/or the evaporation tube of the evaporator, the eddy current generates heat, the fins and/or the evaporation tube are heated, and defrosting is realized. The electromagnetic induction heating wire is integrated in the evaporator, so that the structure of the evaporator assembly is more compact, and the occupied volume of the evaporator assembly is reduced. Simultaneously, through the side setting with the fin of electromagnetic induction heater strip laminating evaporimeter, especially, the electromagnetic induction heater strip coils at least two circles at the fin side, makes the wire inject two at least circle form return circuits that are connected, makes the alternating magnetic field direct action that the electromagnetic induction heater strip produced fin and evaporating pipe to make the inside abundant vortex heat effect of production of fin and/or evaporating pipe, improve the defrosting efficiency.

Furthermore, in the evaporator assembly, the electromagnetic induction heating wire is provided with an inflow point, a first outflow point and at least one second outflow point, and the number of the loop-shaped loops defined by the energized sections of the wires is controlled by controlling the current to flow through the inflow point and the different outflow points, so that the energized parts of the wires can be adjusted according to different frosting amounts of the evaporator, and further, the heating power can be adjusted, and the heating power is more matched with the frosting amount. Particularly, when the evaporator assembly is applied to a refrigerator, the electrified section of the lead wire can be controlled according to different use states of the refrigerator. For example, when the external environment in which the refrigerator is located is relatively humid, all sections of the wire are energized. For another example, when the refrigerator is powered on for the first time, only a part of the sections of the conducting wires can be powered on.

The control method of the refrigerator controls different parts of the lead to be electrified to defrost the evaporator based on one or more of the humidity of the external environment where the refrigerator is located, the door opening condition of the refrigerator, the temperature of the storage chamber of the refrigerator and the temperature of the defrosting sensor of the refrigerator, so that the heating power can be more matched with the use state of the refrigerator, and more energy is saved.

The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

FIG. 1 is a schematic perspective view of an evaporator assembly according to one embodiment of the invention.

Fig. 2 is an enlarged partial schematic view of the evaporator assembly shown in fig. 1.

Fig. 3 is a schematic view of the structure of the evaporator assembly shown in fig. 2, in which the fins, the electromagnetic induction heating wires, and the wire guide rods are engaged.

Fig. 4 is a schematic cross-sectional view of the fin and electromagnetic induction heating wire combination of the evaporator assembly shown in fig. 3.

Fig. 5 is a schematic view of the fin shown in fig. 3 when all sections of the wire of the electromagnetic induction heating wire are energized.

Fig. 6 is a schematic view of a wire section of the electromagnetic induction heating wire of the fin shown in fig. 3 when energized.

Fig. 7 is a schematic view of the first and second wire guides when energized.

Fig. 8 is a schematic view of the first and third wire guides when energized.

Fig. 9 is a schematic side view of a refrigerator according to one embodiment of the present invention.

Fig. 10 is a block diagram schematically illustrating a part of the components of the refrigerator shown in fig. 9.

Fig. 11 is a flowchart illustrating a control method of the refrigerator shown in fig. 9.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Fig. 1 is a schematic perspective view of an evaporator assembly 100 according to one embodiment of the invention. Fig. 2 is an enlarged partial schematic view of the evaporator assembly 100 shown in fig. 1. Fig. 3 is a schematic view of the structure of the evaporator assembly 100 shown in fig. 2, in which the fins 112, the electromagnetic induction heating wire 120, and the wire guide rods are engaged. The evaporator assembly 100 of the embodiment of the present invention may include at least an evaporator 110 and an electromagnetic induction heating wire 120. The evaporator 110 includes an evaporation tube 111 and a plurality of fins 112. The evaporation tube 111 can be composed of a plurality of straight tubes arranged in parallel and a plurality of bent tubes used for communicating the straight tubes, so that the evaporation tube 111 is in a reciprocating bending shape, and a cavity for the refrigerant to flow through is formed in the evaporation tube 111. The fins 112 are sleeved on the evaporation tubes 111, and specifically, the fins 112 can be sleeved on the straight tubes of the evaporation tubes 111, and the fins 112 are arranged in parallel at intervals to define airflow channels, so that the airflow entering the evaporator 110 can pass along the airflow channels between the fins 112 for sufficient heat exchange.

At least one of the evaporation tube 111 and the fin 112 includes a magnetic conductive material. Specifically, the fins 112 and/or the evaporation tubes 111 may be made of a magnetically conductive material, or a coating of a magnetically conductive material may be sprayed on the fins 112 and/or the evaporation tubes 111. The magnetic conductive material may be, for example, iron, cobalt, nickel, an alloy thereof, and the like, and preferably, an iron-based material (such as cast iron) is used, so that the magnetic conductivity and the heat conductivity of the fin 112 can be both considered on the premise of ensuring cost saving.

The electromagnetic induction heating wire 120 is integrated inside the evaporator 110, and the electromagnetic induction heating wire 120 is disposed to be attached to a side of the at least one fin 112 defining an air flow passage. The electromagnetic induction heating wire 120 is internally provided with a wire 121, and the wire 121 can be a copper wire or an aluminum wire. When the conducting wire 121 is conducted and alternating current is applied, alternating current flowing in the conducting wire 121 generates an alternating magnetic field, the alternating magnetic field acts on the evaporation tube 111 and the fin 112, and at least one of the evaporation tube 111 and the fin 112 comprises a magnetic conductive material, the fin 112 and/or the magnetic conductive material contained in the evaporation tube 111 generate eddy current under the action of the alternating magnetic field, and the eddy current generates heat, so that the fin 112 and the evaporation tube 111 of the evaporator 110 can be heated and defrosted by using the heat effect generated by the eddy current.

In some embodiments, the electromagnetic induction heating wire 120 is configured to: the fins 112 are wound at least two times on their sides so that the wires 121 define at least two connected loop-like loops. For example, as shown in fig. 3, the electromagnetic induction heating wire 120 is wound around the fin 112 in substantially four turns so that the wires 121 define four connected loop-like loops.

The evaporator assembly 100 of the embodiment of the present invention includes an electromagnetic induction heating wire 120 integrated in the evaporator 110 and attached to the side of the fin 112 defining the air flow passage. The electromagnetic induction heating wire 120 is internally provided with a lead 121, when the lead 121 is electrified and alternating current is applied, the electromagnetic induction heating wire 120 generates an alternating magnetic field, so that eddy currents are generated in the fins 112 and/or the evaporation tubes 111 of the evaporator 110, the eddy currents generate heat, and the fins 112 and/or the evaporation tubes 111 are heated, so that defrosting is realized. By integrating the electromagnetic induction heating wire 120 inside the evaporator 110, the structure of the evaporator assembly 100 is more compact, reducing the occupied volume of the evaporator assembly 100. Meanwhile, the electromagnetic induction heating wire 120 is attached to the side surface of the fin 112 of the evaporator 110, and particularly, the electromagnetic induction heating wire 120 is wound at least two times on the side surface of the fin 112, so that the lead 121 defines at least two connected loop-shaped loops, and an alternating magnetic field generated by the electromagnetic induction heating wire 120 directly acts on the fin 112 and the evaporation tube 111, so that a sufficient eddy heat effect is generated inside the fin 112 and/or the evaporation tube 111, and the defrosting efficiency is improved.

Fig. 4 is a schematic cross-sectional view of the cooperation of the fins 112 and the electromagnetic induction heating wire 120 of the evaporator assembly 100 shown in fig. 3. Further, in order to avoid the electromagnetic induction heating wire 120 from occupying too much of the airflow path when the electromagnetic induction heating wire 120 is attached to the side surface of the fin 112, the electromagnetic induction heating wire 120 of the embodiment of the present invention is laid flat and wound around the side surface of the fin 112. It should be noted that the number of turns of the wire 121 shown in fig. 4 is merely illustrative, and does not limit the present invention.

Referring to fig. 3, the wire 121 of the electromagnetic induction heating wire 120 of the embodiment of the present invention has an inflow point 131, a first outflow point 132, and at least one second outflow point 133, the second outflow point 133 being located between the inflow point 131 and the first outflow point 132 and configured to: as current flows through the inflow point 131 and the first outflow point 132, the first section of the wire 121 is energized to defrost the evaporator 110; as current flows through the inflow point 131 and the second outflow point 133, a second section of the wire 121 is energized to defrost the evaporator 110, the first section being longer than the second section. A first section, i.e. the section between the inflow point 131 and the first outflow point 132, and a second section, i.e. the section between the inflow point 131 and the second outflow point 133. It should be understood that the inflow point 131, the first outflow point 132, and the second outflow point 133 are virtual points, and only represent points on the wire 121 that can be powered. In the evaporator assembly 100 of the embodiment of the present invention, the electromagnetic induction heating wire 120 has an inflow point 131, a first outflow point 132 and at least one second outflow point 133, and the length of the section of the wire 121 to which electricity is supplied is controlled by controlling the current flowing through the inflow point 131 and the different outflow points, so that the supplied portion of the wire 121 can be adjusted according to the difference of the frost formation amount of the evaporator 110, and further the heating power can be adjusted, so that the heating power and the frost formation amount are more matched. In particular, when the evaporator assembly 100 is applied to the refrigerator 200, the energized section of the wire 121 can be controlled according to different use states of the refrigerator 200. For example, when the external environment in which the refrigerator 200 is located has a high humidity, the first section of the wire 121 is energized. For another example, when the refrigerator 200 is powered on for the first time, only the second section of the wire 121 may be powered on. In some alternative embodiments, there may be a plurality of inflow points 131, and the length of the first section formed by different inflow points 131 paired with the first outflow point 132 may be changed, and the length of the second section formed by different inflow points 131 paired with the second outflow point 133 may also be changed, so long as the first section is longer than the second section.

As shown in fig. 3, the fin 112 has a substantially rectangular shape as a whole. The electromagnetic induction heating wire 120 is also a multi-turn structure wound into a substantially rectangular shape, and is provided near the edge portion of the fin 112. The wire 121 of the electromagnetic induction heating wire 120 has an inflow point 131, a first outflow point 132 and a second outflow point 133. The inflow point 131 is an end point of the wire 121. The first outflow point 132 is the other end of the wire 121. The second outflow point 133 is a point selected at the middle section of the wire 121. The second outflow point 133 is configured such that the first section defines more of a loop-like circuit than the second section. As shown in fig. 5, a section between the inflow point 131 and the first outflow point 132 of the wire 121 constitutes a first section, that is, when current flows through the inflow point 131 and the first outflow point 132, the entire section of the wire 121 is electrified to defrost the evaporator 110. As shown in fig. 6, a section of the wire 121 between the inflow point 131 and the second outflow point 133 constitutes a second section, that is, when current flows through the inflow point 131 and the second outflow point 133, a partial section of the wire 121 is energized to defrost the evaporator 110. It should be understood that the position of the second outflow point 133 in the figures is merely a reference illustration, and the length of the second section can be adjusted by adjusting the position of the second outflow point 133. That is, herein, the partial section of the wire 121 is merely a concept representing a non-entire section as opposed to an entire section, and is not particularly designated as a partial section.

The operation principle of the electromagnetic induction heating wire 120 according to the embodiment of the present invention is briefly described by taking the fin 112 made of the magnetic conductive material as an example. The electromagnetic induction heating wire 120 is energized with alternating current, and the specific implementation process may be as follows: the current and voltage are converted into direct current by a rectifier, and the direct current is converted into high-frequency alternating current by a high-frequency power conversion device, and then the high-frequency alternating current is applied to the electromagnetic induction heating wire 120. After the alternating current is applied, an alternating current is generated in the electromagnetic induction heating wire 120, and the alternating current generates an alternating electromagnetic field. The alternating electromagnetic field acts on the fins 112 of the evaporator 110, and countless small eddy currents are generated in the fins 112 due to the constant change of the magnetic flux, and the directions of the eddy currents enable the magnetic field generated by the eddy currents to compensate the change of the magnetic flux generated by the alternating current as much as possible. The generation of the eddy current generates a thermal effect inside the fins 112, and the fins 112 rapidly increase in temperature, thereby defrosting frost formed on the fins 112 and the evaporation tubes 111.

According to the principle of eddy current effect, the calculation formula of the eddy current power P is as follows:

P＝k×N×f²×B² (1)

where k is a coefficient, f is the frequency of the alternating current (the frequency of the commercial power is 50Hz), B is the magnetic flux density, and N is the number of turns of the coil. In the embodiment of the present invention, the number of the loop-like structures defined by the wire 121 is the number of turns N. For example, if the electromagnetic induction heating wire 120 is wound 4 times on the side of the fin 112 and the wire 121 defines 4 coil-like structures, the number of turns of the wire 121 on the fin 112 is 4. As can be seen from equation (1), when the frequency f and the magnetic flux density B are the same, the eddy current power P is proportional to the number of coil turns N. Accordingly, the number of the coil-shaped structures to be energized can be controlled by energizing all or a part of the sections of the wire 121 for a difference in the amount of frost formation of the evaporator 110, and the heating power (that is, the eddy current power) can be adjusted to match the heating power to the amount of frost formation. For example, when the frost formation amount of the evaporator 110 is small, the current may be controlled to flow in from the inflow point 131 and flow out from the first outflow point 132, so that the entire section of the wire 121 is energized to generate the first alternating magnetic field, and the first alternating magnetic field acts on the evaporator 110 to generate the eddy current in the fin 112 and/or the evaporation tube 111. When the frost amount of the evaporator 110 is small, the current can be controlled to flow in from the inflow point 131 and flow out from the second outflow point 133, so that a partial section of the wire 121 is electrified to generate a second alternating magnetic field, and the second alternating magnetic field acts on the evaporator 110 to generate an eddy current in the fin 112 and/or the evaporation tube 111. Referring again to fig. 5 and 6, the more the loop-like structure defined by the energized section of wire 121, the stronger the eddy currents that are formed.

As shown in fig. 1 and 2, in some embodiments, the number of the electromagnetic induction heating wires 120 is at least two, and the electromagnetic induction heating wires are respectively attached to the side surfaces of at least two fins 112. As required, the electromagnetic induction heating wires 120 may be disposed on all the side surfaces of the fins 112, or the electromagnetic induction heating wires 120 may be disposed on part of the side surfaces of the fins 112. The arrangement solves the problem that the power density of the resistance-type heating wire is limited. Meanwhile, the power of the eddy current can be greatly enhanced by simultaneously energizing the plurality of electromagnetic induction heating wires 120, thereby solving the problem of abnormal frosting. And, it is also possible to match the defrosting capacity and cost of the evaporator assembly 100 with the capacity, the use state, and the like of the refrigerator 200. For example, in a large-volume refrigerator, the electromagnetic induction heating wires 120 are attached to all the fins 112, and in a small-volume refrigerator, the electromagnetic induction heating wires 120 may be attached to the fins 112 at intervals. For another example, for the refrigerator 200 used in a wet environment, the electromagnetic induction heating wire 120 may be attached to all the fins 112, and for the refrigerator 200 used in a dry environment, the electromagnetic induction heating wire 120 may be attached to only a part of the fins 112.

The plurality of electromagnetic induction heating wires 120 may be electrically controlled, and a first wire rod 151, a second wire rod 152 and at least one third wire rod 153 may also be disposed in the evaporator assembly 100. The first wire rod 151 is used to connect the inflow points 131 of the wires 121 of the at least two electromagnetic induction heating wires 120, so that current flows into the wires 121 through the first wire rod 151 and the inflow points 131. The second wire guiding rod 152 is used for connecting the first outflow points 132 of the wires 121 of the at least two electromagnetic induction heating wires 120, so that the current flows into the second wire guiding rod 152 after flowing out of the wires 121 through the first outflow points 132. The at least one third wire rod 153 is used for respectively connecting at least one second outflow point 133 of the wires 121 of the at least two electromagnetic induction heating wires 120, so that current flows into the third wire rod 153 after flowing out of the wires 121 through the second outflow point 133. In the evaporator assembly 100 of the present invention, the first wire guiding rod 151, the second wire guiding rod 152 and the third wire guiding rod 153 are used to connect the plurality of electromagnetic induction heating wires 120, which is convenient to control and low in cost. Fig. 7 is a schematic diagram of the first wire guide rod 151 and the second wire guide rod 152 when they are energized, and current flows in from the first wire guide rod 151 and flows out from the second wire guide rod 152 through all sections of the wire 121. Fig. 8 is a schematic diagram of the first wire guide rod 151 and the third wire guide rod 153 being energized, wherein current flows from the first wire guide rod 151, flows from the third wire guide rod 153, and flows through a partial segment of the wire 121. The flow of current is shown in fig. 7 and 8 by the thicker lines.

The evaporator assembly 100 provided by the embodiment of the invention has a simple structure, is high in defrosting efficiency in a defrosting process, and is very suitable for being applied to an air-cooled refrigerator.

Fig. 9 is a schematic side view of a refrigerator 200 according to one embodiment of the present invention. Fig. 10 is a block diagram schematically illustrating the composition of part of the components of the refrigerator 200 shown in fig. 9. The refrigerator 200 may generally include a cabinet 210, the cabinet 210 including a housing and a storage liner disposed inside the housing, a space between the housing and the storage liner being filled with a thermal insulation material (forming a foaming layer), the storage liner defining therein a storage compartment, the storage liner may generally include a freezing liner, a refrigerating liner, and the like, the storage compartment including a freezing compartment 212 defined in the freezing liner and a refrigerating compartment 211 defined in the refrigerating liner. A refrigerating door 221 is further provided at the front side of the refrigerating compartment 211 to open or close the refrigerating compartment 211. A freezing door body 222 is further provided at the front side of the freezing compartment 212 to open or close the freezing compartment 212. In particular, in the present embodiment, as shown in fig. 9, the freezing inner container is located at the lower portion of the case 210, and defines therein a cooling chamber 230 at the bottom, the evaporator assembly 100 is disposed in the cooling chamber 230 to cool the air flow entering the cooling chamber 230, and the freezing inner container defines a freezing compartment 212 located above the cooling chamber 230 such that the cooling chamber 230 is located at the lowermost portion of the case 210. The evaporator assembly 100 may be generally flat cuboid shaped and disposed across the cooling chamber 230. By placing the evaporator assembly 100 horizontally in the cooling compartment 230, the evaporator assembly 100 is prevented from occupying more space, and the storage volume of the freezer compartment 212 in the upper portion of the cooling compartment 230 is ensured. The front side of the cooling compartment 230 is formed with at least one front return air inlet 231 communicating with the freezing compartment 212 such that the return air flow of the freezing compartment 212 enters the cooling compartment 230 through the at least one front return air inlet 231 to be cooled by the evaporator assembly 100, thereby forming an air flow circulation between the cooling compartment 230 and the freezing compartment 212. At least one of the two lateral side walls of the cooling compartment 230 is formed with a side return air inlet 232, and the refrigerator 200 further includes a refrigerating return air duct 240 communicating the internal space of the refrigerating inner container with the side return air inlet 232 so as to convey the return air flow of the refrigerating compartment 211 into the cooling compartment 230 to be cooled by the evaporator assembly 100, thereby forming an air flow circulation between the refrigerating compartment 211 and the cooling compartment 230. The bottom wall of the cooling chamber 230 is formed with a drain opening through which the defrost water passes to an evaporation pan 260 located in the compressor compartment 250. The refrigerator 200 of the embodiment of the present invention further includes: a control device 400, a humidity sensor 270, a door opening and closing detection device 280, a compartment temperature detection device 290 and a defrosting sensor 300. The control device 400 includes a controller 401 and a memory 402, a computer program 420 is stored in the memory 402, and the computer program 420 is executed such that the controller 401 performs a control method of the refrigerator 200. The humidity sensor 270 is disposed outside the cabinet 210 of the refrigerator 200, and is configured to detect humidity of an external environment in which the refrigerator 200 is located. The door opening and closing detection device 280 is disposed on the door of the refrigerator 200, and is configured to detect an opening and closing condition of the door of the refrigerator 200. The compartment temperature detection device 290 is used to detect the temperature of the storage compartment, and in this embodiment, is disposed in the freezing compartment 212. The frost sensor 300 is disposed on the evaporation pipe 111 of the evaporator assembly 100.

When the evaporator assembly 100 is applied to the refrigerator 200, the control method of the refrigerator 200 according to this embodiment controls different portions of the wire 121 to be energized to defrost the evaporator 110 based on one or more of the humidity of the external environment in which the refrigerator 200 is located, the door opening condition of the refrigerator 200, the temperature of the storage compartment of the refrigerator 200, and the temperature of the defrosting sensor 300 of the refrigerator 200. The control method of the refrigerator 200 according to the embodiment of the present invention combines the control of energizing the wire 121 with the specific use state of the refrigerator 200 based on one or more factors of humidity affecting frosting of the evaporator 110, door opening and closing conditions, compartment temperature, and temperature of the frost sensor 300, so that the heating power can be more matched with the frosting degree of the evaporator 110, and more energy can be saved. Herein, different portions of the wire 121 refer to different portions of the wire 121 being energized, and in particular, different numbers of loop-like structures defined by the energized sections of the wire 121.

In some embodiments, a control method of an embodiment of the present invention includes:

acquiring the humidity of the external environment where the refrigerator 200 is located to obtain an environment humidity value;

judging whether the environmental humidity value is greater than or equal to a preset humidity threshold value:

if so, all sections of the control wire 121 are energized to defrost the evaporator 110;

if not, all or part of the sections of the control wires 121 are electrified to defrost the evaporator 110 based on one or more of the door opening condition of the refrigerator 200, the temperature of the storage compartment and the temperature of the defrosting sensor 300. Considering that the humidity of the external environment of the refrigerator 200 has a large influence on the frosting degree of the evaporator 110, the control method according to the embodiment of the present invention first determines whether the humidity value of the environment is greater than or equal to a preset humidity threshold, and if so, determines that the evaporator 110 is frosted seriously, and adopts a defrosting mode in which all sections of the wire 121 are powered on. The predetermined humidity threshold is, for example, 70% RH or 80% RH. Assuming that the preset humidity threshold is 80% RH, when the detected ambient humidity value is 85% RH, all sections of the control wire 121 are energized to defrost the evaporator 110.

Specifically, before acquiring the humidity of the external environment where the refrigerator 200 is located, it is further determined whether the refrigerator 200 is powered on for the first time. If the refrigerator 200 is initially powered on, a partial section of the control wire 121 is powered on. Generally, the time for the initial power-on of the refrigerator 200 is about 10 hours, the frost formation degree of the evaporator 110 is low, and the judgment time of the control device 400 can be saved and energy can be saved by adopting the defrosting mode of electrifying the section of the lead 121.

In some embodiments, in the control method according to the embodiments of the present invention, the step of controlling all or a partial section of the wire 121 to be energized to defrost the evaporator 110 based on one or more of the door opening condition of the refrigerator 200, the temperature of the storage compartment, and the temperature of the defrosting sensor 300 includes:

acquiring the door opening frequency of the refrigerator 200;

judging whether the door opening frequency is greater than or equal to a preset frequency threshold value or not;

if so, all sections of the control wire 121 are energized to defrost the evaporator 110;

if not, all or part of the sections of the lead wires 121 are electrified to defrost the evaporator 110 based on the temperature of the storage compartment and the temperature of the defrosting sensor 300. The refrigerator 200 may cause a large temperature fluctuation in the storage compartment every time the door is opened and closed, thereby affecting the operation of the evaporator 110. The door opening frequency is used here to consider the door opening of the refrigerator 200. For example, the average number of door openings per hour is used as the door opening frequency, or the number of door openings per day is used as the door opening frequency. When the door opening frequency is greater than or equal to the preset frequency threshold, it can be considered that the frosting degree of the evaporator 110 is high, and a defrosting mode in which all sections of the lead 121 are electrified is adopted. The preset frequency threshold may be, for example, 1 time/h, 2 times/h, 3 times/day. Assuming that the preset frequency threshold is 1 time/h, when the detected door opening frequency is 2 times/h, all the sections of the control wire 121 are energized to defrost the evaporator 110.

In some embodiments, in the control method of the present invention, the storage compartment is the freezing compartment 212, and the step of controlling the energization of all or a part of the section of the wire 121 to defrost the evaporator 110 based on the temperature of the storage compartment and the temperature of the defrosting sensor 300 includes:

acquiring the temperature change trend of the freezing chamber 212;

acquiring the temperature change trend of the defrosting sensor 300;

judging whether the temperature variation trend of the freezing chamber 212 is an ascending trend and whether the temperature variation trend of the defrosting sensor 300 is a descending trend;

if so, all sections of the control wire 121 are energized to defrost the evaporator 110;

if not, a partial section of the control wire 121 is energized to defrost the evaporator 110. When the door opening frequency is less than the preset frequency threshold, the frosting degree of the evaporator 110 cannot be accurately determined, and at this time, it is determined whether the temperature of the freezing compartment 212 is increased and the temperature of the defrosting sensor 300 is decreased. When the temperature of the freezing compartment 212 rises and the temperature of the defrosting sensor 300 falls, it indicates that the operation of the evaporator 110 is abnormal, the frost is severe, and the evaporator 110 cannot be cooled effectively, and at this time, all the sections of the control wire 121 are electrified to defrost the evaporator 110. For example, when the temperature of the freezing compartment 212 is increased by, for example, 2 to 6 ℃ and the temperature of the defrosting sensor 300 is decreased by, for example, 5 to 15 ℃ in the current sensing period compared to the previous sensing period, all sections of the control wire 121 are energized to defrost the evaporator 110. For another example, when the temperature of the freezing compartment 212 is increased but the temperature of the defrosting sensor 300 is not decreased in the current sensing period compared to the previous sensing period, a partial section of the control wire 121 is energized to defrost the evaporator 110. For another example, the temperature of the freezing compartment 212 does not rise, the temperature of the defrosting sensor 300 does not fall, and a partial section of the control wire 121 is energized to defrost the evaporator 110 in the current detection period compared to the previous detection period.

Fig. 11 is a flowchart illustrating a control method of the refrigerator 200 shown in fig. 9. The control method of the embodiment of the invention comprises the following steps:

s102: detecting whether the refrigerator 200 is powered on for the first time;

s104: if the determination result in the step S102 is yes, controlling the partial section of the wire 121 to be electrified to defrost the evaporator 110, specifically controlling the current to flow from the first wire rod 151 into the third wire rod 153 and the section between the inflow point 131 and the second outflow point 133 of the wire 121 to be electrified;

s106: if the judgment result in the step S102 is negative, acquiring the humidity of the external environment in which the refrigerator 200 is located, and obtaining an environment humidity value;

s108: judging whether the environmental humidity value is greater than or equal to a preset humidity threshold value:

s110: if the determination result in the step S108 is yes, all the sections of the wires 121 are controlled to be powered on to defrost the evaporator 110, specifically, the current is controlled to flow from the first wire rod 151 to flow out from the second wire rod 152, and the section between the inflow point 131 and the first outflow point 132 of the wires 121 is powered on to defrost the evaporator 110;

s112: if the judgment result in the step S108 is negative, acquiring the door opening frequency of the refrigerator 200;

s114: judging whether the door opening frequency is greater than or equal to a preset frequency threshold value or not;

s116: if the determination result in step S114 is yes, all the sections of the wires 121 are controlled to be powered on to defrost the evaporator 110, specifically, the current is controlled to flow from the first wire rod 151 to flow out from the second wire rod 152, and the section between the inflow point 131 and the first outflow point 132 of the wires 121 is powered on to defrost the evaporator 110;

s118: if the judgment result in the step S114 is negative, acquiring the temperature of the freezing compartment 212 and the temperature of the defrosting sensor 300 to obtain a first freezing temperature and a first defrosting temperature;

s120: acquiring the temperature of the freezing chamber 212 and the temperature of the defrosting sensor 300 in the last detection period to obtain a second freezing temperature and a second defrosting temperature;

s122: judging whether the first freezing temperature is higher than the second freezing temperature or not and whether the first defrosting temperature is lower than the second defrosting temperature or not;

s124: if the determination result in the step S122 is yes, all the sections of the wires 121 are controlled to be powered on to defrost the evaporator 110, specifically, the current is controlled to flow from the first wire rod 151 to flow out from the second wire rod 152, and the section between the inflow point 131 and the first outflow point 132 of the wires 121 is powered on to defrost the evaporator 110;

s126: if the determination result in the step S122 is negative, the partial section of the lead 121 is controlled to be powered on to defrost the evaporator 110, specifically, the current is controlled to flow from the first lead rod 151 into the third lead rod 153 and flow out from the third lead rod, and the section between the inflow point 131 and the second outflow point 133 of the lead 121 is powered on to defrost the evaporator 110.

The evaporator assembly 100 of the embodiment of the present invention includes an electromagnetic induction heating wire 120 integrated in the evaporator 110 and attached to the side of the fin 112 defining the air flow passage. The electromagnetic induction heating wire 120 is internally provided with a lead 121, when the lead 121 is electrified and alternating current is applied, the electromagnetic induction heating wire 120 generates an alternating magnetic field, so that eddy currents are generated in the fins 112 and/or the evaporation tubes 111 of the evaporator 110, the eddy currents generate heat, and the fins 112 and/or the evaporation tubes 111 are heated, so that defrosting is realized. By integrating the electromagnetic induction heating wire 120 inside the evaporator 110, the structure of the evaporator assembly 100 is more compact, reducing the occupied volume of the evaporator assembly 100. Meanwhile, the electromagnetic induction heating wire 120 is attached to the side surface of the fin 112 of the evaporator 110, and particularly, the electromagnetic induction heating wire 120 is wound at least two times on the side surface of the fin 112, so that the lead 121 defines at least two connected loop-shaped loops, and an alternating magnetic field generated by the electromagnetic induction heating wire 120 directly acts on the fin 112 and the evaporation tube 111, so that a sufficient eddy heat effect is generated inside the fin 112 and/or the evaporation tube 111, and the defrosting efficiency is improved.

The control method of the refrigerator 200 according to the embodiment of the present invention controls different portions of the wire 121 to be energized to defrost the evaporator 110 based on one or more of the humidity of the external environment where the refrigerator 200 is located, the door opening condition of the refrigerator 200, the temperature of the storage compartment of the refrigerator 200, and the temperature of the defrosting sensor 300 of the refrigerator 200, so that the heating power can be more matched with the state of the refrigerator 200, and more energy can be saved.

Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.