Evaporator assembly and refrigerator including the same

Abstract

The present invention provides an evaporator assembly and a refrigerator including the evaporator assembly. The evaporator assembly includes: an evaporator, the evaporator includes: an evaporator tube for refrigerant flow, and a plurality of fins mounted on the evaporator tube, wherein the evaporator tube and / or the fins contain magnetic conductive material; and an electromagnetic induction heating wire, which is integrated inside the evaporator and surrounds the fins, and a conductor is arranged inside the electromagnetic induction heating wire for generating an alternating magnetic field after an alternating current is applied to the conductor, so that the fins and / or the evaporator tube containing the magnetic conductive material are induced to heat up to defrost the evaporator. The evaporator assembly of the present invention has a compact structure, occupies a small volume, and has high defrosting efficiency and electrical efficiency, and is very suitable for the application scenario of an air-cooled refrigerator.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration equipment, in particular to an evaporator assembly and a refrigerator comprising the evaporator assembly. Background Art

[0002] After an air-cooled refrigerator has been running for a long time, frost will form on the evaporator used to provide cold air, thereby affecting the transfer of cold air and reducing the refrigeration performance of the refrigerator. Therefore, in actual applications, it is usually necessary to defrost the evaporator of the refrigerator.

[0003] In the prior art, for air-cooled refrigerators, a defrosting heating wire is usually installed on the evaporator. In particular, refrigerators equipped with a bottom-mounted refrigeration system usually have a defrosting heating wire (such as an aluminum tube heating wire) installed on the horizontal evaporator. These heating wires are resistive, that is, by applying voltage to a high-resistance resistor, the Joule heat generated by the resistor is Q=I 2 *R, using the heat generated by the resistor to heat the evaporator fins and the frost on them to achieve defrosting. However, this method of using resistor heat to defrost has low electrical efficiency and slow heating speed, which makes the evaporator defrost for a long time.

[0004] In order to improve the defrosting solution of refrigerators, there are currently solutions that use electromagnetic induction coils to generate alternating magnetic fields, thereby generating eddy current heating in ferromagnetic materials, thereby defrosting the evaporator. However, in these solutions, the electromagnetic induction coil is usually set on one side of the evaporator, and even needs to be equipped with a dedicated electromagnetic induction heating plate. On the one hand, this structure increases the occupied volume of the evaporator component, which is not conducive to the design of the refrigerator to fully utilize the space. On the other hand, the alternating magnetic field generated by the electromagnetic induction coil is difficult to completely cover the fins of the evaporator, which to a certain extent reduces the effect of electromagnetic induction defrosting. Summary of the invention

[0005] An object of the present invention is to provide an evaporator assembly which has a compact structure, small occupied volume and high defrosting efficiency and utilizes electromagnetic fields to generate eddy current effects on fins and / or evaporation tubes for defrosting.

[0006] A further object of the present invention is to provide different heating powers for different amounts of frosting, thereby solving the problem of abnormal frosting.

[0007] In particular, the present invention provides an evaporator assembly comprising:

[0008] Evaporator, the evaporator comprises:

[0009] Evaporator tubes through which the refrigerant flows; and

[0010] A plurality of fins mounted on the evaporator tube, wherein the evaporator tube and / or the fins contain magnetic conductive material;

[0011] as well as

[0012] The electromagnetic induction heating wire is integrated inside the evaporator and surrounds the fins. A conductor is arranged inside the electromagnetic induction heating wire for generating an alternating magnetic field after alternating current is applied to the conductor, so that the fins and / or evaporation tubes containing magnetic conductive materials are induced to heat up to defrost the evaporator.

[0013] Optionally, the electromagnetic induction heating wire is wound around two sides of the plurality of fins perpendicular to the airflow direction to form two connected ring-shaped loops.

[0014] Optionally, grooves matching the cross-sectional shape of the electromagnetic induction heating wire are provided on both sides of each fin perpendicular to the airflow direction;

[0015] The electromagnetic induction heating wire is embedded in the groove on the fin.

[0016] Optionally, the cross-section of the electromagnetic induction heating wire is cylindrical;

[0017] The grooves arranged on the fins are semicircular.

[0018] Optionally, the evaporator further comprises a first cover plate and a second cover plate respectively located on opposite sides of the plurality of fins perpendicular to the airflow direction;

[0019] The two loops of the electromagnetic induction heating wire are fixed on the first cover plate and the second cover plate respectively.

[0020] Optionally, the first cover plate and / or the second cover plate are made of an iron-based material.

[0021] Optionally, the number of the wires is at least two groups;

[0022] Each set of wires can be energized independently.

[0023] Optionally, each set of wires has a different number of wires;

[0024] The at least two sets of wires are configured as:

[0025] According to the amount of frost on the evaporator, the corresponding group of wires is energized to defrost the evaporator.

[0026] Another aspect of the present invention further provides a refrigerator, comprising:

[0027] A box body having at least one storage compartment;

[0028] an air supply duct for delivering cold air to at least one storage compartment; and

[0029] The evaporator assembly of any of the above items is used to provide cold air after heat exchange by the evaporator assembly to the air supply duct.

[0030] Optionally, at least one storage compartment includes a freezer compartment defined at a lower portion of the box body, and a refrigeration chamber is formed at the bottom of the freezer compartment;

[0031] The evaporator assembly is arranged in the refrigeration chamber, and the windward side of the evaporator faces the front side of the refrigerator.

[0032] The evaporator assembly of the present invention includes an electromagnetic induction heating wire integrated in the evaporator and arranged around the fins of the evaporator. A wire is arranged inside the electromagnetic induction heating wire. When the wire is energized and alternating current is applied, the electromagnetic induction heating wire generates an alternating magnetic field, so that eddy currents are generated in the fins and / or evaporation tubes of the evaporator. The eddy currents generate heat, so that the fins and / or evaporation tubes are heated, thereby achieving defrosting. By integrating the electromagnetic induction heating wire inside the evaporator, the structure of the evaporator assembly is made more compact, and the occupied volume of the evaporator assembly is reduced. At the same time, by arranging the electromagnetic induction heating wire around the fins of the evaporator, in particular, the electromagnetic induction heating wire is wound around the two sides of the fins perpendicular to the airflow direction to form two connected ring loops, the alternating magnetic field generated by the electromagnetic induction heating wire can completely cover the fins and evaporation tubes of the evaporator, so that sufficient eddy current thermal effects are generated inside the fins and / or evaporation tubes, thereby improving the defrosting efficiency.

[0033] Furthermore, in the evaporator assembly of the present invention, at least two groups of wires are arranged inside the electromagnetic induction heating wire, and each group of wires can be energized independently. By adopting the setting of multiple groups of wires that are independently energized, the corresponding groups of wires can be energized according to the different amounts of frosting on the evaporator to adjust the heating power so that the heating power matches the amount of frosting. For example, when the amount of frost on the evaporator is small, only one group of wires can be energized, and when the amount of frost on the evaporator is large, all groups of wires can be energized at the same time. This setting solves the problem of limited power density of resistive heating wires on the one hand, and on the other hand, it can greatly enhance the power of eddy currents by energizing multiple groups of wires at the same time, thereby solving the problem of abnormal frosting.

[0034] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0036] Figure 1 is a perspective schematic diagram of an evaporator assembly according to one embodiment of the present invention;

[0037] Figure 2 yes Figure 1 An exploded schematic diagram of the evaporator assembly is shown;

[0038] Figure 3 is a perspective schematic diagram of an evaporator assembly according to another embodiment of the present invention;

[0039] Figure 4 yes Figure 3 An exploded schematic diagram of the evaporator assembly is shown;

[0040] Figure 5 is a schematic diagram of the working principle of an electromagnetic induction heating wire according to an embodiment of the present invention;

[0041] Figure 6 is a schematic diagram of a positioning structure of an electromagnetic induction heating wire according to another embodiment of the present invention;

[0042] Figure 7 is a schematic diagram of the internal structure of an electromagnetic induction heating wire according to an embodiment of the present invention;

[0043] Figure 8 A schematic side view of a refrigerator according to one embodiment of the present invention;

[0044] Fig. 9 yes Figure 8 A partial schematic diagram of a refrigerator is shown. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0046] Figure 1 is a perspective schematic diagram of an evaporator assembly 100 according to an embodiment of the present invention. Figure 2 yes Figure 1 An exploded schematic diagram of the evaporator assembly 100 is shown. Figure 3 is a perspective schematic diagram of an evaporator assembly 100 according to another embodiment of the present invention. Figure 4 yes Figure 3 FIG. 1 is an exploded schematic diagram of the evaporator assembly 100. Figures 1 to 4As shown, the evaporator assembly 100 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 may be composed of a plurality of straight tubes arranged in parallel and a plurality of curved tubes for connecting 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 inside. The fins 112 are mounted on the evaporation tube 111. Specifically, the fins 112 may be mounted on the straight tubes of the evaporation tube 111, and the fins 112 are arranged in parallel and spaced apart, so that the airflow entering the evaporator 110 can pass through the spaces between the fins 112 for sufficient heat exchange.

[0047] At least one of the evaporation tube 111 and the fin 112 contains a magnetic conductive material. Specifically, the fin 112 and / or the evaporation tube 111 may be made of a magnetic conductive material, or a magnetic conductive material coating may be sprayed on the fin 112 and / or the evaporation tube 111. The magnetic conductive material may be, for example, iron, cobalt, nickel, and alloy materials thereof, preferably an iron-based material (such as cast iron), so that the magnetic conductive property and thermal conductive property of the fin 112 can be taken into account while ensuring cost savings.

[0048] The electromagnetic induction heating wire 120 is integrated inside the evaporator 110 and is arranged around the fin 112 to form a closed coil. A wire 121 is arranged inside the electromagnetic induction heating wire 120, and the wire 121 can be made of copper wire or aluminum wire. When the wire 121 is turned on and alternating current is applied, the alternating current flowing in the wire 121 will generate an alternating magnetic field, which acts on the evaporation tube 111 and the fin 112. Since at least one of the evaporation tube 111 and the fin 112 contains a magnetic conductive material, the magnetic conductive material contained in the fin 112 and / or the evaporation tube 111 generates eddy currents under the action of the alternating magnetic field, and the eddy currents generate heat, so that the thermal effect generated by the eddy currents can be used to heat and defrost the fin 112 and the evaporation tube 111 of the evaporator 110.

[0049] Figure 5 FIG. 1 is a schematic diagram showing the working principle of the electromagnetic induction heating wire 120 according to an embodiment of the present invention. It should be noted that, for the sake of simplicity, Figure 5 Only the portion of the electromagnetic induction heating wire 120 surrounding one side of the fin 112 of the evaporator 110 is shown. Those skilled in the art will appreciate that the working principle of the portion of the electromagnetic induction heating wire 120 surrounding the other side of the fin 112 of the evaporator 110 is similar to that of the evaporator 110. Figure 5 The following is an example of a fin 112 made of a magnetic material. Figure 5 The working principle of the electromagnetic induction heating wire 120 is described in detail. Figure 5As shown, the electromagnetic induction heating wire 120 is supplied with alternating current. The specific implementation process can be as follows: the current voltage is converted into direct current through a rectifier, and the direct current is converted into high-frequency alternating current through 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. Due to the continuous change of the magnetic flux, countless small eddy currents are generated in the fins 112. The direction of the eddy currents makes the magnetic field generated by the eddy currents compensate for the change of the magnetic flux generated by the alternating current as much as possible. The generation of eddy currents generates a thermal effect inside the fins 112, and the fins 112 heat up rapidly, thereby defrosting the frost on the fins 112 and the evaporation tube 111.

[0050] In the embodiment of the present invention, the electromagnetic induction heating wire is integrated inside the evaporator, so that the structure of the evaporator assembly is more compact and the occupied volume of the evaporator assembly is reduced. At the same time, by arranging the electromagnetic induction heating wire around the fins of the evaporator, the alternating magnetic field generated by the electromagnetic induction heating wire can completely cover the fins and evaporation tubes of the evaporator, so that sufficient eddy current thermal effect is generated inside the fins and / or evaporation tubes, thereby improving the defrosting efficiency and electrical efficiency.

[0051] Continue to see Figures 1 to 4 The electromagnetic induction heating wire 120 is wound around the two sides of the fin 112 perpendicular to the airflow direction to form two connected loops 122. The airflow direction refers to the direction in which the airflow passes through the intervals between the fins 112, such as Figures 1 to 4 The x direction is shown in the figure, and the direction perpendicular to the airflow is shown in the y direction. The two loops 122 are respectively located on both sides of the fin 112 in the y direction. In this way, when alternating current is passed through the electromagnetic induction heating wire 120, the alternating magnetic field generated by the loops 122 on both sides of the fin 112 fully covers the fin 112 and the evaporation tube 111 of the evaporator 110, thereby enhancing the eddy current effect in the fin 112 and / or the evaporation tube 111.

[0052] Furthermore, in order to stably wrap the electromagnetic induction heating wire 120 around the two sides of the fin 112 perpendicular to the airflow direction to ensure the electromagnetic induction heating effect, the present invention also improves the installation method of the electromagnetic induction heating wire 120.

[0053] In one installation method, the electromagnetic induction heating wire 120 can be embedded in the fin 112 of the evaporator 110. Figure 2, each fin 112 is provided with grooves 113 on both sides perpendicular to the airflow direction (i.e., both sides in the y direction), and the shape of the grooves 113 is adapted to the cross-sectional shape of the electromagnetic induction heating wire 120. The electromagnetic induction heating wire 120 is embedded in the grooves 113 on the fins 112. Specifically, the two loops 122 of the electromagnetic induction heating wire 120 are respectively embedded in the grooves 113, so that the electromagnetic induction heating wire 120 is firmly fixed inside the evaporator 110 without occupying additional space outside the evaporator 110. Generally, the cross section of the electromagnetic induction heating wire 120 is cylindrical, and the shape of the groove 113 can be adaptively designed to be semicircular, trapezoidal, triangular, etc. Preferably, the shape of the groove 113 is semicircular, so that the electromagnetic induction heating wire 120 can be embedded in the groove 113 as completely as possible, and the gap between the electromagnetic induction heating wire 120 and the groove 113 is minimized, so that the installation of the electromagnetic induction heating wire 120 is more stable.

[0054] In another installation method, the electromagnetic induction heating wire 120 can be fixed on the cover plate of the evaporator 110. Figure 3 and Figure 4 , the evaporator 110 may further include a first cover plate 114 and a second cover plate 115. The first cover plate 114 is located on one side of the fin 112 perpendicular to the airflow direction, and the second cover plate 115 is located on the other side of the fin 112 perpendicular to the airflow direction, so that the plurality of fins 112 are sandwiched between the first cover plate 114 and the second cover plate 115, so that the airflow entering the evaporator 110 passes along the intervals between the fins 112 for heat exchange. The two loops 122 of the electromagnetic induction heating wire 120 are respectively fixed on the first cover plate 114 and the second cover plate 115. There are many ways to fix the loop 122. For example, the loop 122 can be fixed in the receiving groove by opening a receiving groove corresponding to the extension path of the loop 122 on the first cover plate 114 and the second cover plate 115; or, the loop 122 can also be fixed on the surface of the first cover plate 114 and the second cover plate 115 facing the fin 112 by a commonly used fixing member, and the present invention does not make specific restrictions on this.

[0055] In one embodiment, Figure 6 As shown, at least one positioning protrusion 116 can be provided on the surface of the first cover plate 114 and the second cover plate 115 facing the fin 112 along the extension path of the loop 122, and each positioning protrusion 116 is provided with a clamping groove 117, and the corresponding part of the loop 122 of the electromagnetic induction heating wire 120 is clamped in the clamping groove 117 to achieve the installation and positioning of the electromagnetic induction heating wire 120. By providing the clamping grooves on the first cover plate and the second cover plate to fix the electromagnetic induction heating wire, there is no need to structurally modify the fins of the evaporator, thereby simplifying the installation operation.

[0056] Furthermore, one or both of the first cover plate 114 and the second cover plate 115 can be made of a magnetic conductive material (preferably an iron-based material). In this way, on the one hand, the magnetic conductivity of the first cover plate 114 and / or the second cover plate 115 can enhance the magnetic field strength of the alternating magnetic field generated by the electromagnetic induction heating wire 120 acting on the evaporator, thereby enhancing the eddy current thermal effect of the fins 112 and / or the evaporation tube 111 of the evaporator. On the other hand, the first cover plate 114 and / or the second cover plate 115 made of a magnetic conductive material itself will also generate an eddy current effect under the action of the alternating magnetic field, thereby generating heat, which is radiated to the evaporator, thereby playing a role in assisting defrosting.

[0057] In the embodiment of the present invention, in order to adapt to the power requirements under different frosting degrees, the present invention also improves the internal structure of the electromagnetic induction heating wire.

[0058] Figure 7 FIG. 1 is a schematic diagram showing the internal structure of an electromagnetic induction heating wire 120 according to an embodiment of the present invention. Figure 7 As shown, the number of wires 121 disposed inside the electromagnetic induction heating wire 120 is at least two groups, each group of wires 121 includes a plurality of mutually insulated wires, and each group of wires 121 can be energized independently. For example, assuming that two groups of wires 121 are disposed inside the electromagnetic induction heating wire 120: a first group of wires 121a and a second group of wires 121b, in actual applications, only the first group of wires 121a or the second group of wires 121b can be energized, or both the first group of wires 121a and the second group of wires 121b can be energized. It should be noted that Figure 7 The number of wire groups and the number of wires contained in each wire group shown in the figure are merely illustrative and do not limit the present invention.

[0059] According to the principle of eddy current effect, the calculation formula of eddy current power P is as follows:

[0060] P=k×N×f 2 ×B 2 (1)

[0061] Wherein, k is a coefficient, f is the frequency of the alternating current (the frequency of the mains is 50 Hz), 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 wires contained in each group of wires 121 is the number of turns N of the group of wires. For example, if the first group of wires 121a includes 300 wires, the number of turns of the first group of wires 121a is 300.

[0062] It can be seen from formula (1) that, 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. Therefore, by adopting the setting of multiple groups of independently energized wires, the corresponding groups of wires can be energized according to the different amounts of frosting on the evaporator to adjust the heating power (i.e., eddy current power) so that the heating power matches the amount of frosting.

[0063] For example, it is assumed that a first group of wires 121a and a second group of wires 121b are provided inside the electromagnetic induction heating wire 120. When the amount of frost on the evaporator is small, alternating current can be applied only to the first group of wires 121a to generate an alternating magnetic field c, which acts on the evaporator to generate eddy currents in the fins 112 and / or the evaporation tubes 111. When the amount of frost on the evaporator is large, alternating current is applied to the first group of wires 121a and the second group of wires 121b at the same time to generate alternating magnetic fields c and alternating magnetic fields d, which act together on the evaporator to generate stronger eddy currents in the fins 112 and / or the evaporation tubes 111. This arrangement solves the problem of limited power density of resistive heating wires on the one hand, and on the other hand, the power of eddy currents can be greatly enhanced by energizing multiple groups of wires at the same time, thereby solving the problem of abnormal frost.

[0064] Further, in the embodiment of the present invention, the number of wires contained in each group of wires 121 inside the electromagnetic induction heating wire 120 can be set to be different from each other. It is known from the previous analysis that 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. Therefore, for different amounts of frost on the evaporator, the evaporator can be defrosted by selecting a corresponding group of wires containing an appropriate number of wires to be energized, so as to improve the pertinence of the defrosting operation, ensure the defrosting speed while avoiding the consumption of excess electric energy, and further improve the electrical efficiency.

[0065] For example, it is assumed that the electromagnetic induction heating wire 120 is internally provided with a first group of wires 121a and a second group of wires 121b, the number of turns of the first group of wires 121a is 300, and the number of turns of the second group of wires 121b is 200. When a defrost signal is received, if the amount of frost on the evaporator is less than or equal to the first threshold, the second group of wires 121b is energized for defrosting. If the amount of frost on the evaporator is greater than the first threshold but less than or equal to the second threshold, the first group of wires 121a is energized for defrosting. If the amount of frost on the evaporator is greater than the second threshold, the first group of wires 121a and the second group of wires 121b are energized together for defrosting. The first threshold and the second threshold can be set according to the collected parameters, such as the relative humidity of the external environment of the refrigerator, the number of times the refrigerator door is opened and closed, etc.

[0066] The evaporator assembly provided by the embodiment of the present invention has a simple structure and high defrosting efficiency during the defrosting process, and is very suitable for application in air-cooled refrigerators.

[0067] An embodiment of the present invention further provides a refrigerator. Figure 8 is a schematic side view of a refrigerator 10 according to one embodiment of the present invention. Fig. 9 yes Figure 8 FIG. 1 is a partial schematic diagram of a refrigerator 10 shown in FIG. Figure 8 and Fig. 9 As shown, the refrigerator 10 includes a housing 20, an air supply duct 300, and an evaporator assembly 100. The housing 20 has at least one storage compartment 200, and the storage compartment 200 can be a freezer compartment, a refrigerator compartment, a variable temperature compartment, etc. The air supply duct 300 can be located at the rear or side of the storage compartment 200, and is used to deliver cold air to the storage compartment 200. The evaporator assembly 100 is used to provide the cold air output after heat exchange by the evaporator assembly 100 to the air supply duct 300. It should be noted that Figure 8 and Fig. 9 The installation position of the evaporator assembly 100 shown in the figure is only an exemplary installation position of the present invention. Those skilled in the art will understand that the evaporator assembly 100 can also be installed at other appropriate positions of the refrigerator 10, such as the rear of the storage compartment 200 below.

[0068] In a further embodiment, at least one storage compartment 200 of the refrigerator 10 includes a freezing compartment 210 defined at the lower portion of the housing 20. A refrigerating chamber 220 is formed at the bottom of the freezing compartment 210, and a portion of the freezing compartment 210 above the refrigerating chamber 220 constitutes a frozen storage cavity. Specifically, the frozen storage cavity of the freezing compartment 210 can be separated from the refrigerating chamber 220 by an evaporator cover. The evaporator assembly 100 is disposed in the refrigerating chamber 220, and the windward side of the evaporator in the evaporator assembly 100 faces the front side of the refrigerator 10. That is, the evaporator assembly 100 is disposed in the refrigerating chamber 220 at the bottom of the freezing compartment 210 in a horizontally disposed manner. Since the evaporator assembly 100 has a compact structure and occupies a small volume, it is very suitable for the application of a refrigerator with a bottom-mounted refrigeration system, and while providing efficient defrosting, it improves the space utilization rate of the freezing compartment of the refrigerator.

[0069] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. An evaporator assembly, comprising: An evaporator, the evaporator comprising: Evaporator tubes through which the refrigerant flows; and a plurality of fins mounted on the evaporator tube, wherein the evaporator tube and / or the fins contain magnetic conductive material; and An electromagnetic induction heating wire is integrated inside the evaporator and surrounds the fins. A wire is provided inside the electromagnetic induction heating wire for generating an alternating magnetic field after an alternating current is applied to the wire, so that the fins containing magnetic conductive materials and / or the evaporation tubes are heated by induction to defrost the evaporator. in, The electromagnetic induction heating wire is wound around two sides of the plurality of fins perpendicular to the airflow direction to form two connected ring-shaped loops; The evaporator further comprises a first cover plate and a second cover plate respectively located on opposite sides of the plurality of fins perpendicular to the airflow direction, wherein the first cover plate and / or the second cover plate are made of a magnetic conductive material; The two loops of the electromagnetic induction heating wire are fixed on the first cover plate and the second cover plate respectively; The number of the wires is at least two groups, each group of the wires is configured to be independently energized, and the number of wires in each group of the wires is different; and The at least two groups of the conductive lines are configured as follows: According to the amount of frost on the evaporator, the corresponding group of the wires is energized to defrost the evaporator.

2. The evaporator assembly according to claim 1, wherein: The cross section of the electromagnetic induction heating wire is cylindrical.

3. The evaporator assembly according to claim 1, wherein: The first cover plate and / or the second cover plate are made of an iron-based material.

4. The evaporator assembly according to claim 1, wherein: The first cover plate and the second cover plate are provided with receiving grooves corresponding to the extension path of the annular loop, and the annular loop is fixed in the receiving grooves.

5. The evaporator assembly according to claim 1, wherein: The annular loop is fixed to the surfaces of the first cover plate and the second cover plate facing the fins by a fixing member.

6. The evaporator assembly according to claim 1, wherein: At least one positioning protrusion is respectively arranged on the surfaces of the first cover plate and the second cover plate facing the fin along the extension path of the annular loop, and each of the positioning protrusions is provided with a slot, and the portion of the annular loop corresponding to the positioning protrusion is clamped in the slot.

7. A refrigerator, comprising: A box body having at least one storage compartment; an air supply duct for delivering cold air to the at least one storage compartment; as well as The evaporator assembly according to any one of claims 1 to 6 is used to provide cold air after heat exchange by the evaporator assembly to the air supply duct.

8. The refrigerator according to claim 7, wherein: The at least one storage compartment includes a freezer compartment defined at a lower portion of the box body, and a refrigeration chamber is formed at the bottom of the freezer compartment; The evaporator assembly is disposed in the refrigeration chamber, and a windward side of the evaporator faces the front side of the refrigerator.

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