Electric range

Abstract

An electric range is disclosed. By forming a through hole in the lower surface of the case and arranging a cover with a slit formed to surround the through hole, the electric range can maximize airflow efficiency, reduce noise generated during operation of the electric range, comply with safety standards for the electric range, and prevent bending (sagging) of the lower surface of the case.

Description

Technology Field

[0001] The present invention relates to an electric range, and more specifically, to an electric range that reduces noise generated during operation, efficiently cools the interior of the device, and complies with safety standards. Background Technology

[0003] Various types of cooking appliances are used to heat food in homes and restaurants. The aforementioned cooking appliances include gas ranges that use gas and electric ranges that use electricity.

[0004] Electric ranges are broadly divided into resistance heating and induction heating methods.

[0005] The electric resistance method is a method of generating heat by applying an electric current to a metal resistance wire or a non-metallic heating element such as silicon carbide, and heating a workpiece (e.g., a cooking vessel such as a pot or frying pan) by radiating or conducting the generated heat.

[0006] Induction heating is a method of applying high-frequency power to a coil to generate a magnetic field around the coil, and using the eddy current generated from the generated magnetic field to heat a body made of metal components.

[0007] If we look at the basic heating principle of the induction heating method, when current is applied to the working coil or heating coil, heat is generated as the object to be heated undergoes induction heating, and the object to be heated is heated by the generated heat.

[0008] An electric range is equipped with a driving circuit (e.g., a printed circuit board (PCB)) to drive the heating element and other components, and the temperature of the circuit rises due to the operation of the heating element. Therefore, to prevent fires caused by the increase in the temperature of the circuit, a blower fan is installed inside the electric range to lower the internal temperature of the device and cool the circuit.

[0009] Meanwhile, safety accidents may occur where a user's fingers come into contact with the blower fan. Therefore, in the case of conventional blower fans, components such as grills are installed to prevent the user's fingers from coming into contact with the fan in order to comply with safety standards.

[0010] However, there is a problem where noise is generated during the operation of the blower fan due to the grille. Additionally, the air (wind) generated by the fan hits the grille, which leads to a decrease in the fan's airflow efficiency. The problem to be solved

[0012] The objective of the present invention is to provide an electric range capable of preventing noise generated inside the device.

[0013] In addition, the objective of the present invention is to provide an electric range capable of maximizing airflow efficiency.

[0014] In addition, the objective of the present invention is to provide an electric range that complies with safety standards.

[0015] In addition, the objective of the present invention is to provide an electric range that can prevent bending (sagging) of the lower surface of the case.

[0016] The objects of the present invention are not limited to those mentioned above, and other unmentioned objects and advantages of the present invention may be understood from the following description and will be more clearly understood by the embodiments of the present invention. Furthermore, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims. means of solving the problem

[0018] The electric range according to the present invention can maximize airflow efficiency by supplying and discharging air through a plurality of through holes formed on the lower surface of the case.

[0019] The electric range according to the present invention can comply with safety standards for electric ranges by placing a cover having a plurality of slits on the outside of the bottom surface of the case to surround a plurality of through holes.

[0020] The electric range according to the present invention can improve the rigidity of the lower surface of the case and prevent bending (sagging) of the lower surface of the case by arranging a first cover and a second cover facing each other on the outside of the lower surface of the case.

[0021] The electric range according to the present invention can reduce noise generated during operation of the electric range by using a blower fan that does not have a structure formed to prevent contact with foreign substances. Effects of the invention

[0023] According to the present invention, removing the grille present in conventional blower fans has the advantage of reducing noise and maximizing blowing efficiency.

[0024] In addition, according to the present invention, a cover including a slit that allows air to pass through is placed on the lower surface of the case to comply with safety standards for electric ranges.

[0025] In addition, according to the present invention, the phenomenon of the case sagging due to weight can be prevented through one or more covers.

[0026] In addition to the effects described above, the specific effects of the present invention are described together with the specific details for implementing the invention below. Brief explanation of the drawing

[0027] FIG. 1 is a perspective view of an induction heating device according to one embodiment of the present invention. FIGS. 2 to 5 are perspective views showing some components omitted from the induction heating device of FIG. 1. FIG. 6 is a top view of a case according to one embodiment of the present invention. FIG. 7 is a plan view of a case according to one embodiment of the present invention, viewed from below. FIG. 8 is a perspective view of a case combined with a cover, viewed from below, according to one embodiment of the present invention. FIG. 9 is a perspective view of a cover according to one embodiment of the present invention. FIG. 10 is a drawing for explaining the concept of maximizing the airflow efficiency of an induction heating device according to one embodiment of the present invention. FIGS. 11 to 13 are drawings for explaining the sagging of the lower surface of a case depending on whether or not a cover is placed, according to an embodiment of the present invention. Specific details for implementing the invention

[0028] The aforementioned objectives, features, and advantages are described in detail below with reference to the attached drawings, thereby enabling those skilled in the art to easily implement the technical concept of the present invention. In describing the present invention, detailed descriptions of known technologies related to the present invention are omitted if it is determined that such descriptions would unnecessarily obscure the essence of the invention. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

[0029] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless specifically stated otherwise, the first component may also be the second component.

[0030] In the following, the statement that any configuration is placed on the "upper (or lower)" of a component or on the "upper (or lower)" of a component may mean not only that any configuration is placed in contact with the upper (or lower) surface of said component, but also that another configuration may be interposed between said component and any configuration placed on (or below) said component.

[0031] In addition, where it is stated that one component is "connected," "combined," or "connected" to another component, it should be understood that while the components may be directly connected or connected to each other, another component may be "interposed" between each component, or each component may be "connected," "combined," or "connected" through another component.

[0032] Throughout the specification, unless specifically stated otherwise, each component may be singular or plural.

[0033] As used in this specification, singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “composed” or “comprising” should not be interpreted as necessarily including all of the various components or steps described in the specification, and should be interpreted as meaning that some of the components or steps may be omitted or additional components or steps may be included.

[0034] Throughout the specification, "A and / or B" means A, B, or A and B unless specifically stated otherwise, and "C to D" means C or more and D or less unless specifically stated otherwise.

[0035] Hereinafter, an electric range according to some embodiments of the present invention will be described.

[0036] Meanwhile, the electric range described in this invention encompasses both electric resistance type electric ranges and induction heating type electric ranges (i.e., induction heating devices). For the sake of convenience of explanation, embodiments of this invention will be described focusing on an induction heating device in which a working coil is provided as a heating element. However, this invention is not limited thereto.

[0037] FIG. 1 is a perspective view of an induction heating device (100) according to one embodiment of the present invention. FIG. 2 to 5 are perspective views of the induction heating device (100) of FIG. 1 with some components omitted.

[0038] For reference, FIG. 2 is a drawing in which the cover plate (104) is omitted from the induction heating device (100) of FIG. 1, FIG. 3 is a drawing in which the cover plate (104) and working coils (106a, 106b, 106c, 106d, 106e) are omitted from the induction heating device (100) of FIG. 1, FIG. 4 is a drawing in which the cover plate (102), working coils (104), and base plates (108a, 108b, 108c) are omitted from the induction heating device (100) of FIG. 1, FIG. 5 is a drawing in which the cover plate (102), working coils (104), base plates (108a, 108b, 108c), and air guides (120a, 120b, 120c) are omitted from the induction heating device (100) of FIG. 1.

[0039] Referring to FIGS. 1 to 5, an induction heating device (100) according to one embodiment of the present invention includes a case (102), a cover plate (104), a working coil (106a, 106b, 106c, 106d, 106e), a base place (108a, 108b, 108c), a driving circuit part (110a, 110b, 110c), a heat sink (112a, 112b, 112c), a power input part (114), a filter circuit part (116a, 116b, 116c), a blower fan (118a, 118b, 118c), and an air guide (120a, 120b, 120c).

[0040] The case (102) can perform the function of protecting the components within the induction heating device (100). For example, the case (102) may be made of aluminum, but the present invention is not limited thereto. Meanwhile, the case (102) may be insulated to prevent heat generated by the working coils (106a, 106b, 106c, 106d, 106e) from leaking to the outside.

[0041] A cover plate (104) is attached to the top of the case (102) to shield the interior of the case (102), and a body to be heated (not shown, an object heated by at least one of the working coils (106a, 106b, 106c, 106d, 106e)) can be placed on the top surface.

[0042] A heating object, such as a cooking vessel, is placed on the upper surface of the cover plate (104), and heat generated from the working coils (106a, 106b, 106c, 106d, 106e) can be transferred to the heating object through the upper surface of the cover plate (104).

[0043] The cover plate (104) may be made of glass, but the present invention is not limited thereto.

[0044] An input interface (1041) that receives input from a user may be installed on the upper surface of the cover plate (104). The input interface (1041) is installed so as to be embedded flatly on the upper surface of the cover plate (104) and can display a specific image. The input interface (1041) receives touch input from the user, and the induction heating device (100) can be driven based on the received touch input.

[0045] Specifically, the input interface (1041) is a module for inputting the heating intensity or heating time desired by the user, and can be implemented as a physical button or touch panel. Additionally, the operating status of the induction heating device (100) can be displayed on the input interface (1041).

[0046] For example, the input interface (1041) may be a TFT LCD (Thin Film Transistor Liquid Crystal Display), but is not limited thereto.

[0047] A light display area (1042a, 1042b, 1042c) may be formed on the upper surface of the cover plate (104). A light source unit (1043a, 1043b, 1043c) may be disposed on the lower surface of the cover plate (104), and light emitted from the light source unit (1043a, 1043b, 1043c) may be transmitted to the user through the light display area (1042a, 1042b, 1042c).

[0048] The working coils (106a, 106b, 106c, 106d, 106e) are heating parts that heat the object to be heated and can be placed inside the case (102).

[0049] The working coils (106a, 106b, 106c, 106d, 106e) may be made of a wire wound multiple times in an annular shape and may generate an alternating magnetic field. Additionally, a mica sheet and a ferrite core may be sequentially arranged on the lower side of the working coils (106a, 106b, 106c, 106d, 106e).

[0050] The ferrite core can be fixed to the mica sheet through a sealant and can diffuse the alternating magnetic field generated in the working coils (106a, 106b, 106c, 106d, 106e). The mica sheet can be fixed to the working coils (106a, 106b, 106c, 106d, 106e) and the ferrite core through the sealant and can prevent heat generated by the working coils (106a, 106b, 106c, 106d, 106e) from being directly transferred to the ferrite core.

[0051] There may be multiple working coils (106a, 106b, 106c, 106d, 106e). The multiple working coils (106a, 106b, 106c, 106d, 106e) may include a first working coil (106a) positioned in the center of the case (102), a second working coil (106b) and a third working coil (106c) positioned to the right of the first working coil (106a), and a fourth working coil (106d) and a fifth working coil (106e) positioned to the left of the first working coil (106a). The second working coil (106b) and the third working coil (106c) may be arranged vertically to the right of the first working coil (106a), and the fourth working coil (106d) and the fifth working coil (106e) may be arranged vertically to the left of the first working coil (106a).

[0052] For example, the first working coil (106a) may be a high-output dual heating coil, and the second working coil (106b), the third working coil (106c), the fourth working coil (106d), and the fifth working coil (106e) may be single heating coils. The first working coil (106a), which is a dual heating coil, is heavy and may have a maximum output of 7000 kW.

[0053] Meanwhile, the induction heating device (100) according to one embodiment of the present invention may also have a wireless power transmission function based on the configuration and features described above.

[0054] In other words, wireless power supply technology has been developed and is being applied to many electronic devices. Electronic devices equipped with wireless power transmission technology can charge their batteries simply by placing them on a charging pad, without the need for a separate charging connector. Since electronic devices utilizing wireless power transmission do not require wired cords or chargers, portability is improved, and their size and weight are reduced compared to conventional devices.

[0055] Wireless power transmission technologies include electromagnetic induction using coils, resonance using resonance, and radio wave radiation that converts electrical energy into microwaves for transmission. Among these, electromagnetic induction is a technology that transmits power by utilizing electromagnetic induction between a primary coil (e.g., a working coil) equipped in a device that transmits wireless power and a secondary coil equipped in a device that receives wireless power.

[0056] The induction heating method of the induction heating device (100) is substantially identical in principle to the wireless power transmission technology by electromagnetic induction in that it heats the object to be heated by electromagnetic induction. Therefore, the induction heating device (100) according to one embodiment of the present invention can perform not only the induction heating function but also the wireless power transmission function.

[0057] Base plates (108a, 108b, 108c) may be placed in the middle of the case (102), and a plurality of working coils (106a, 106b, 106c, 106d, 106e) may be placed on top. The base plates (108a, 108b, 108c) may support a plurality of heavy working coils (106a, 106b, 106c, 106d, 106e) and perform the function of seating the plurality of working coils (106a, 106b, 106c, 106d, 106e). An input interface (1042) and a light source unit (1043a, 1043b, 1043c) may be further placed on top of the base plates (108a, 108b, 108c).

[0058] According to one embodiment of the present invention, there may be a plurality of base plates (108a, 108b, 108c). Meanwhile, the present invention is not limited thereto, and one base plate may be disposed inside the case (102).

[0059] According to one embodiment of the present invention, a plurality of base plates (108a, 108b, 108c) may include a first base plate (108a), a second base plate (108b), and a third base plate (108c).

[0060] The first base plate (108a), the second base plate (108b), and the third base plate (108c) can be arranged side by side in the middle of the case (102).

[0061] The first base plate (108a) may be located in the center of the middle of the case (102). A first working coil (106a) may be placed on the upper part of the first base plate (108a).

[0062] A first light source unit (1043a) corresponding to an input interface (1041) and a first working coil (106a) may be further disposed on the upper part of the first base plate (108a). On the upper part of the first base plate (108a), the input interface (1041) is disposed below the first light source unit (1043a), and the first light source unit (1043a) is disposed below the input interface (1041). Meanwhile, a through hole A (1081a) may be formed in the first base plate (108a) for disposing of the input interface (1041) and the first light source unit (1043a).

[0063] The second base plate (108b) may be positioned to the right of the first base plate (108a) in the middle of the case (102). The second working coil (106b) and the third working coil (106c) may be positioned on the upper part of the second base plate (108b).

[0064] A second light source unit (1043b) corresponding to the second working coil (106b) and the third working coil (106c) may be further disposed on the upper portion of the second base plate (108b). On the upper portion of the second base plate (108b), the second working coil (106b), the third working coil (106c), and the second light source unit (1043b) may be disposed sequentially. Meanwhile, a through hole B (1081b) for disposing of the second light source unit (1043b) may be formed in the second base plate (108b).

[0065] The third base plate (108c) may be positioned to the left of the first base plate (108a) in the middle of the case (102). The fourth working coil (106d) and the fifth working coil (106e) may be positioned on the upper part of the third base plate (108c).

[0066] A third light source unit (1043c) corresponding to the fourth working coil (106d) and the fifth working coil (106e) may be further disposed on the upper portion of the third base plate (108c). On the upper portion of the third base plate (108c), the fourth working coil (106d), the fifth working coil (106e), and the third light source unit (1043c) may be disposed sequentially. Meanwhile, a through hole C (1081c) for disposing of the third light source unit (1043c) may be formed in the third base plate (108c).

[0067] A plurality of mounting portions (1021) for mounting a plurality of base plates (108a, 108b, 108c) may be formed on a part of the outer surface of the case (102). That is, the edges of the plurality of base plates (108a, 108b, 108c) may be mounted on the upper portions of the plurality of mounting portions (1021), and accordingly, the plurality of base plates (108a, 108b, 108c) may be positioned in the middle of the case (102).

[0068] A bracket (1022) may be placed in the lower central portion of the case (102). The bracket (1022) is placed in the lower central portion of the first base plate (108a) and can perform the function of preventing bending (i.e., sagging of the base plate (108a)) caused by the weight of the first base plate (108a). At this time, the weight of the first base plate (108a) may include the weight of the first working coil (106a) placed on the upper portion of the first base plate (108a).

[0069] At least one elastic element (1025) may be disposed on the upper part of the bracket (1022). For example, the elastic element (1025) may be a plate spring. The upper end of at least one elastic element (1025) may come into contact with the lower surface of the first base plate (108a) and may prevent bending of the first base plate (108a).

[0070] The driving circuit section (110a, 110b, 110c) can control the driving of a plurality of working coils (106a, 106b, 106c, 106d, 106e) which are heating sections, and can further control the driving of components of the induction heating device (100), such as an input interface (1041).

[0071] The driving circuit section (110a, 110b, 110c) may be equipped with various components related to driving the working coil (106a, 106b, 106c, 106d, 106e). The various components may include a power supply section that provides AC power, a rectifier section that rectifies the AC power of the power supply section into DC power, an inverter section that converts the DC power rectified by the rectifier section into a resonant current through a switching operation and provides it to the working coil (106), a microcomputer (i.e., microcontroller) that controls the inverter section and components related to driving the same, and a relay or semiconductor switch that turns on or turns off the working coil (106a, 106b, 106c, 106d, 106e).

[0072] The driving circuit section (110a, 110b, 110c) may include a first driving circuit section (110a), a second driving circuit section (110b), and a third driving circuit section (110c). The first driving circuit section (110a) may be positioned on the lower right side of the case (102) relative to the bracket (1022) and can control the driving of the first working coil (106a). The second driving circuit section (110b) may be positioned to the right of the first driving circuit section (110a) and can control the driving of the second working coil (106b) and the third working coil (106c). The third driving circuit section (110c) may be positioned on the lower left side of the case (102) relative to the bracket (1022) and can control the driving of the fourth working coil (106d) and the fifth working coil (106e).

[0073] The heat sink (112a, 112b, 112c) is placed on top of a part of the driving circuit (110a, 110b, 110c) and can perform the function of preventing the temperature of the component placed on the part of the driving circuit (110a, 110b, 110c) from rising.

[0074] The heat sink (112a, 112b, 112c) may include a first heat sink (112a), a second heat sink (112b), and a third heat sink (112c). The first heat sink (112a) can prevent a temperature rise of a component installed in a part of the first driving circuit (110a), the second heat sink (112b) can prevent a temperature rise of a component installed in a part of the second driving circuit (110b), and the third heat sink (112c) can prevent a temperature rise of a component installed in a part of the third driving circuit (110c).

[0075] The power input section (114) can perform the function of supplying external power to the induction heating device (100). The power input section (114) can be implemented as a terminal block.

[0076] The power input (114) may be positioned at any one of the edges of the bottom of the case (102). For example, the power input (114) may be positioned at the upper left of the bottom of the case (102).

[0077] The filter circuit section (116a, 116b, 116c) can be placed on any one of the bottom edges of the case (102) and can reduce noise generated by a plurality of working coils (106a, 106b, 106c, 106d, 106e).

[0078] The filter circuit section (116a, 116b, 116c) may include a first filter circuit section (116a), a second filter circuit section (116b), and a third filter circuit section (116c).

[0079] The first filter circuit (116a) can reduce noise generated by the first working coil (106a). The second filter circuit (116b) can reduce noise generated by the second working coil (106b) and the third working coil (106c). The third filter circuit (116c) can reduce noise generated by the fourth working coil (106d) and the fifth working coil (106e).

[0080] The blower fans (118a, 118b, 118c) can perform the function of cooling the internal temperature of the case (102). Accordingly, the blower fans (118a, 118b, 118c) can cool the temperature of various components installed in the driving circuit section (110a, 110b, 110c).

[0081] The blower fans (118a, 118b, 118c) may include a first blower fan (118a), a second blower fan (118b), and a third blower fan (118c).

[0082] The first blower fan (118a) can cool various components installed in the first driving circuit unit (110a), and additionally perform the function of cooling the first light source unit (1043a) and the input interface (1041). In particular, the first blower fan (118a) can deliver air (wind) for cooling to the first heat sink (112a) located on the upper part of the first driving circuit unit (110a).

[0083] The second blower fan (118b) can cool various components installed in the second drive circuit unit (110b) and, in addition, can perform the function of cooling the second light source unit (1043b). In particular, the second blower fan (118b) can deliver air for cooling to the second heat sink (112b) located on the upper part of the second drive circuit unit (110b).

[0084] The third blower fan (118c) can cool various components installed in the third drive circuit unit (110c) and, in addition, can perform the function of cooling the third light source unit (1043c). In particular, the third blower fan (118c) can deliver air for cooling to the third heat sink (112c) located on the upper part of the third drive circuit unit (110c).

[0085] Meanwhile, the blower fans (118a, 118b, 118c) may not have a structure formed to prevent foreign substances from coming into contact with the blower fans (118a, 118b, 118c).

[0086] The air guide (120a, 120b, 120c) can perform the function of guiding air generated from the blower fan (118a, 118b, 118c).

[0087] The air guide (120a, 120b, 120c) may include a first air guide (120a), a second air guide (120b), and a third air guide (120c).

[0088] The first air guide (120a) can be positioned to surround the first heat sink (112a) installed in a part of the first driving circuit (110a), and can guide (transfer) air output from the first blower fan (118a) to the first heat sink (112a).

[0089] The second air guide (120b) can be positioned to surround the second heat sink (112b) installed in a part of the second driving circuit (110b), and can guide air output from the second blower fan (118b) to the second heat sink (112b).

[0090] The third air guide (120c) can be positioned to surround the third heat sink (112c) installed in a part of the third driving circuit (110c), and can guide air output from the third blower fan (118c) to the third heat sink (112c).

[0091] An induction heating device (100) according to one embodiment of the present invention has the configuration and features described above. Hereinafter, the configuration of the induction heating device (100) that reduces noise generated by the blower fans (118a, 118b, 118c), maximizes blower efficiency, complies with safety standards, and reinforces the rigidity of the lower surface of the case (102) will be described in more detail.

[0092] FIG. 6 is a perspective view of a case (102) according to an embodiment of the present invention viewed from above. FIG. 7 is a plan view of a case (102) according to an embodiment of the present invention viewed from below. FIG. 8 is a perspective view of a case (102) combined with covers (122a, 122b) according to an embodiment of the present invention viewed from below. FIG. 9 is a perspective view of covers (122a, 122b) according to an embodiment of the present invention.

[0093] Meanwhile, for convenience of explanation, FIG. 6 only shows the shape in which the third air guide (120c) is placed in the case (102) at the top of the third driving circuit part (110c).

[0094] Hereinafter, the configuration of the induction heating device (100) will be described in detail with reference to the drawings.

[0095] A first through hole (1023a, 1023b, 1023c) and a second through hole (1024a, 1024b, 1024c) may be formed in the lower part of the case (102). Except for the first through hole (1023a, 1023b, 1023c) and the second through hole (1024a, 1024b, 1024c), the lower part of the case (102) may have a closed shape.

[0096] The first through hole (1023a, 1023b, 1023c) can function as a passage to supply air to the blower fan (118a, 118b, 118c).

[0097] The first through hole (1023a, 1023b, 1023c) may be formed on the lower surface of the case (102) adjacent to the bottom of the blower fan (118a, 118b, 118c), thereby allowing air to be supplied to the blower fan (118a, 118b, 118c).

[0098] The first through hole (1023a, 1023b, 1023c) may be formed on one side of the lower surface of the case (102). That is, the first through hole (1023a, 1023b, 1023c) may be formed on one edge of the edges of the case (102).

[0099] The number of first through holes (1023a, 1023b, 1023c) may be equal to the number of blower fans (118a, 118b, 118c). That is, the first-1 through hole (1023a) may provide a passage for supplying air to the first blower fan (118a), the first-2 through hole (1023b) may provide a passage for supplying air to the second blower fan (118b), and the first-3 through hole (1023c) may provide a passage for supplying air to the third blower fan (118c). The first-1 through hole (1023a), the first-2 through hole (1023b), and the first-3 through hole (1023c) may be arranged side by side at one edge of the case (102).

[0100] The shape of the first through hole (1023a, 1023b, 1023c) may correspond to the shape of the lower surface of the blower fan (118a, 118b, 118c). That is, the shape of the first through hole (1023a, 1023b, 1023c) may be identical to the shape of the fan inside the blower fan (118a, 118b, 118c). However, the present invention is not limited thereto.

[0101] The second through hole (1024a, 1024b, 1024c) can function as a passage for discharging air output from the blower fan (118a, 118b, 118c) to the outside of the case (102). That is, the second through hole (1024a, 1024b, 1024c) can discharge air inside the case (102) to the outside.

[0102] As mentioned above, an air guide (120a, 120b, 120c) that performs the function of guiding air generated from a blower fan (118a, 118b, 118c) may be disposed at the bottom of the case (102). One end of the air guide (120a, 120b, 120c) is disposed adjacent to the blower fan (118a, 118b, 118c), and the other end of the air guide (120a, 120b, 120c) may be connected by contacting the lower surface of the case (102).

[0103] The second through hole (1024a, 1024b, 1024c) may be formed on the other side of the lower surface of the case (102). That is, the second through hole (1024a, 1024b, 1024c) may be formed on the other edge among the edges of the case (102).

[0104] The second through hole (1024a, 1024b, 1024c) can be connected to the other end of the air guide (120a, 120b, 120c), thereby allowing air to be discharged to the outside of the case (102).

[0105] The shape of the second through hole (1024a, 1024b, 1024c) may correspond to the shape of the other end of the air guide (120a, 120b, 120c). That is, the shape of the second through hole (1024a, 1024b, 1024c) may be identical to the shape of the other end of the air guide (120a, 120b, 120c).

[0106] The number of second through holes (1024a, 1024b, 1024c) may be equal to the number of air guides (120a, 120b, 120c). The second-1 through hole (1024a) may be connected to the first air guide (120a) to provide a passage for discharging air, the second-2 through hole (1024b) may be connected to the second air guide (120b) to provide a passage for discharging air, and the second-3 through hole (1024c) may be connected to the third air guide (120a) to provide a passage for discharging air. The second-1 through hole (1024a), the second-2 through hole (1024b), and the second-3 through hole (1024c) may be arranged side by side at the other edge of the case (102).

[0107] The first cover (122a) may be positioned on the outside of the lower surface of the case (102) and may be positioned to surround the first through holes (1023a, 1023b, 1023c). That is, the first cover (122a) may be positioned to surround the first-1 through hole (1023a), the first-2 through hole (1023b), and the first-3 through hole (1023c) arranged parallel to each other at one edge of the case (102). Additionally, a plurality of first slits (1224a) may be formed in the first cover (122a). The first cover (122a) may be made of aluminum, but the present invention is not limited thereto.

[0108] More specifically, the first cover (122a) may include a first slit portion (1221a), a plurality of first extension portions (1222a), and a plurality of first bend portions (1223a).

[0109] A plurality of first slits (1224a) may be formed inside the first slit portion (1221a). The first slit portion (1221a) may be positioned facing the lower surface of the case (102) and may have a square shape. The shapes of the plurality of first slits (1224a) may be identical and may be arranged side by side inside the first slit portion (1221a).

[0110] A plurality of first slits (1224a) perform the function of preventing foreign matter from coming into contact with the blower fans (118a, 118b, 118c). The foreign matter may be the extremities of the user's body, for example, the user's fingers. That is, the plurality of first slits (1224a) perform the function of preventing the user's fingers from entering the blower fans (118a, 118b, 118c). Therefore, it is preferable that the width of the plurality of first slits (1224a) be smaller than the width of the user's fingers.

[0111] A plurality of first extension portions (1222a) may be formed by extending in the height direction from a plurality of ends of the first slit portion (1221a). When the first slit portion (1221a) is square in shape, the plurality of first extension portions (1222a) may include a first left extension portion extending in the height direction from the left end of the first slit portion (1221a), a first right extension portion extending in the height direction from the right end of the first slit portion (1221a), a first upper extension portion extending in the height direction from the upper end of the first slit portion (1221a), and a first lower extension portion extending in the height direction from the lower end of the first slit portion (1221a). The height of the plurality of first extension portions (1222a) may be the same.

[0112] A plurality of first bend portions (1223a) may be bent (e.g., bent at 90°) at each of a plurality of first extension portions (1222a). A plurality of first bend portions (1223a) may be arranged in contact with the outside of the lower surface of the case (104). When the first slit portion (1221a) is square in shape, a plurality of first bend portions (1223a) may include a first left bend portion bent outward from the first left extension portion to the outside of the first slit portion (1221a), a first right bend portion bent outward from the first right extension portion to the outside of the first slit portion (1221a), a first upper bend portion bent outward from the first upper extension portion to the outside of the first slit portion (1221a), and a first lower bend portion bent outward from the first lower extension portion to the outside of the first slit portion (1221a).

[0113] A plurality of first bend portions (1223a) can be connected to the lower surface of the case (102). At least one first coupling hole (1225a) is formed in each of the plurality of first bend portions (1223a), and the plurality of first bend portions (1223a) and the lower surface of the case (102) can be connected through screw coupling.

[0114] The second cover (122b) may be positioned on the outside of the lower surface of the case (102) and may be positioned to surround the second through holes (1024a, 1024b, 1024c). That is, the second cover (122b) may be positioned to surround the second-1 through hole (1024a), the second-2 through hole (1024b), and the second-3 through hole (1024c) which are arranged side by side at one edge of the case (102). Additionally, a plurality of second slits (1224b) may be formed in the second cover (122b). The second cover (122b) may be made of aluminum, but the present invention is not limited thereto.

[0115] More specifically, the first cover (122a) may include a first slit portion (1221a), a plurality of first extension portions (1222a), and a plurality of first bend portions (1223a).

[0116] A plurality of first slits (1224a) may be formed inside the first slit portion (1221a). The first slit portion (1221a) may be positioned facing the lower surface of the case (102) and may have a square shape.

[0117] More specifically, the second cover (122b) may include a second slit portion (1221b), a plurality of second extension portions (1222b), and a plurality of second bend portions (1223b).

[0118] A plurality of second slits (1224b) may be formed inside the second slit portion (1221b). The second slit portion (1221b) may be positioned facing the lower surface of the case (102) and may have a square shape. The shapes of the plurality of second slits (1224b) may be identical and may be arranged side by side inside the second slit portion (1221b).

[0119] Multiple second slits (1224b) also perform the function of preventing foreign matter from coming into contact with the blower fans (118a, 118b, 118c). That is, the multiple second slits (1224b) perform the function of preventing the user's fingers from entering the blower fans (118a, 118b, 118c). Therefore, it is preferable that the width of the multiple second slits (1224b) be smaller than the width of the user's fingers.

[0120] A plurality of second extension portions (1222b) may be formed by extending in the height direction from a plurality of ends of the second slit portion (1221b). If the second slit portion (1221b) is square in shape, the plurality of second extension portions (1222b) may include a second left extension portion extending in the height direction from the left end of the second slit portion (1221b), a second right extension portion extending in the height direction from the right end of the second slit portion (1221b), a second upper extension portion extending in the height direction from the upper end of the second slit portion (1221b), and a second lower extension portion extending in the height direction from the lower end of the second slit portion (1221b). The height of the plurality of second extension portions (1222b) may be the same.

[0121] A plurality of second bend portions (1223b) may be bent (e.g., bent at 90°) at each of the plurality of second extension portions (1222b). A plurality of second bend portions (1223b) may be arranged in contact with the outside of the lower surface of the case (104). When the second slit portion (1221b) is square in shape, the plurality of second bend portions (1223b) may include a second left bend portion bent outward from the second left extension portion to the outside of the second slit portion (1221b), a second right bend portion bent outward from the second right extension portion to the outside of the second slit portion (1221b), a second upper bend portion bent outward from the second upper extension portion to the outside of the second slit portion (1221b), and a second lower bend portion bent outward from the second lower extension portion to the outside of the second slit portion (1221b).

[0122] A plurality of second bend portions (1223b) can be connected to the lower surface of the case (102). At least one second coupling hole (1225b) is formed in each of the plurality of second bend portions (1223b), and the plurality of second bend portions (1223b) and the lower surface of the case (102) can be connected through screw coupling.

[0123] A first cover (122a) may be placed on one edge of the lower surface of the case (102), and a second cover (122b) may be placed on the other edge of the lower surface of the case (102), and the first cover (122a) and the second cover (122b) may be placed facing each other.

[0124] The height of the first cover (122a) and the height of the second cover (122b) may be the same. The number of first through holes (1023a, 1023b, 1023c) and the number of second through holes (1024a, 1024b, 1024c) may be the same, and each of the second-1 through hole (1024a), second-2 through hole (1024b), and second-3 through hole (1024c) may be arranged opposite to the corresponding first-1 through hole (1023a), first-2 through hole (1023b), and first-3 through hole (1023c).

[0125] Hereinafter, the configuration of an induction heating device (100) according to one embodiment of the present invention will be explained in comparison with the configuration of a conventional induction heating device.

[0126] The blower fan in conventional induction heating devices is equipped with a structure, namely a grille, to prevent the user's fingers from coming into contact with the fan. However, when the fan is in operation, noise is generated due to the grille formed on the fan, which causes inconvenience to the user.

[0127] However, the induction heating device (100) according to the present invention uses a blower fan (118a, 118b, 118c) that does not have a grill formed thereon. Therefore, no noise is generated due to the grill. Accordingly, the induction heating device (100) according to the present invention can reduce noise generated during operation.

[0128] In addition, conventional induction heating devices also suffer from the problem that air cannot be easily supplied to the fan because it collides with the grille.

[0129] However, in the case of the induction heating device (100) according to the present invention, a blower fan (118a, 118b, 118c) without a grille is used, and a first through hole (1023a, 1023b, 1023c) is formed on the lower surface of the case (102). Therefore, air does not come into contact with the grille, and air can be efficiently delivered to the blower fan (118a, 118b, 118c) through the first through hole (1023a, 1023b, 1023c). That is, the induction heating device (100) according to the present invention can maximize airflow efficiency.

[0130] Hereinafter, with reference to Table 1 and FIG. 10 below, the concept of maximizing the airflow efficiency of an induction heating device (100) according to one embodiment of the present invention will be explained.

[0131] In Table 1 and FIG. 10, case 1 is a case where a through hole is formed on the lower surface of the case (102) with a structure that prevents contact with foreign matter, and the first cover (122a) is not connected to the lower surface of the case (102). case 2 is a case where a first through hole (1023a, 1023b, 1023c) is formed on the lower surface of the case (102), and the first cover (122a) having a height of 6 mm is connected to the lower surface of the case (102). case 3 is a case where a first through hole (1023a, 1023b, 1023c) is formed on the lower surface of the case (102), and the first cover (122a) having a height of 12 mm is connected to the lower surface of the case (102). Also, FIG. 10 illustrates the flow of air within the air guide (120a, 120b, 120c).

[0133] case 1 case 2 case 3 Flow rate (g / s) at the output end of the blower fan Left 4.85 5.36 5.49 center 4.90 5.33 5.46 Right 4.92 5.45 5.61 Flow rate (g / s) of the other end of the air guide Left 3.61 4.00 4.11 center 3.66 4.00 4.09 Right 3.62 4.00 4.15

[0135] Referring to Table 1 and Fig. 10, it can be seen that in case 3, the flow rate at the output end of the blower fan (118a, 118b, 118c) and the flow rate at the other end of the air guide (120a, 120b, 120c) are maximized. Therefore, the blowing efficiency can be maximized when using the cover (122a, 122b) which is relatively high.

[0136] In addition, the induction heating device (100) according to the present invention has a plurality of slits (1224a, 1224b) formed in the cover (122a, 122b) that replace the grill formed in the blower fan in the conventional induction heating device.

[0137] That is, the width of the plurality of slits (1224a, 1224b) formed in the covers (122a, 122b) can be formed to be smaller than the width of a user's finger, and the user's finger cannot enter the interior of the blower fan (118a, 118b, 118c). Therefore, the induction heating device (100) according to the present invention can comply with safety standards. That is, the induction heating device (100) according to the present invention can comply with the finger test.

[0138] Furthermore, a cover (122a, 122b) having a certain height is placed on the outside of the lower surface of the case (102). At this time, the cover (122a, 122b) is made of a metal material such as aluminum, and a slit portion (1221a, 1221b) is placed facing the lower surface of the case (102) through an extension portion (1222a, 1222b) and a bend portion (1223a, 1223b). Accordingly, the rigidity of the lower surface of the case (102) is reinforced due to the material and height of the cover (122a, 122b), and bending (sagging) of the lower surface of the case (102) can be prevented.

[0139] FIGS. 11 to 13 are drawings for explaining the sagging of the lower surface of a case (102) depending on whether or not a cover (122a, 122b) is placed, according to an embodiment of the present invention.

[0140] More specifically, FIG. 11 illustrates the bending of the lower surface of the case (102) when the covers (122a, 122b) are not placed outside the lower surface of the case (102), FIG. 12 illustrates the bending of the lower surface of the case (102) when the covers (122a, 122b) are placed outside the lower surface of the case (102), and FIG. 13 is a graph illustrating the degree of bending of the lower surface of the case (102) depending on the load and the placement of the covers (122a, 122b).

[0141] In particular, referring to FIG. 11, a driving circuit part (110a, 110b, 110c), a heat sink (112a, 112b, 112c), etc. are arranged between the first through hole (1023a, 1023b, 1023c) and the second through hole (1024a, 1024b, 1024c). Accordingly, due to the weight of the driving circuit part (110a, 110b, 110c), the heat sink (112a, 112b, 112c), etc., a sag of 1.683 mm occurs at the point between the first through hole (1023a, 1023b, 1023c) and the second through hole (1024a, 1024b, 1024c).

[0142] However, referring to FIG. 12, a first cover (122a) is disposed on the outside of the lower surface of the case (102) in which the first through holes (1023a, 1023b, 1023c) are formed, and a second cover (122b) is disposed on the outside of the lower surface of the case (102) in which the second through holes (1024a, 1024b, 1024c) are formed. Since the first cover (122a) and the second cover (122b) reinforce the rigidity of the lower surface of the case (102), a sag of 1.376 mm occurs at the point between the first through holes (1023a, 1023b, 1023c) and the second through holes (1024a, 1024b, 1024c).

[0143] Accordingly, compared to the case where the covers (122a, 122b) are not placed on the outside of the lower surface of the case (102) (Fig. 11), the present invention can improve the rigidity of the lower surface of the case (102) and reduce the sagging of the lower surface of the case (102).

[0144] Although the present invention has been described above with reference to the illustrated drawings, the present invention is not limited by the embodiments and drawings disclosed in this specification, and it is obvious that various modifications can be made by a person skilled in the art within the scope of the technical concept of the present invention. Furthermore, even if the effects of the configuration of the present invention were not explicitly described while explaining the embodiments of the present invention above, it is natural to acknowledge that the effects predictable by said configuration should also be recognized. Explanation of the symbols

[0146] 100: Induction heating device 102: Case 1021: Seating part 1022: Bracket 1023a: 1-1 through hole 1023b: 1-2 through hole 1023c: 1st-3rd through hole 1024a: 2nd-1st through hole 1024b: 2-2 through hole 1024c: 2-3 through hole 1025: Elastic element 104: Cover plate 1041: Input interface 1042a: First optical display area 1042b: Second optical display area 1042c: Third optical display area 1043a: 1st light source unit 1043b: 2nd light source unit 1043c: 3rd light source unit 106a: 1st working coil 106b: 2nd working coil 106c: 3rd working coil 106d: 4th Working Coil 106e: 5th Working Coil 108a: 1st base plate 108b: 2nd base plate 108c: Third base plate 1081a: Through hole A 1081b: Through hole B 1081c: Through hole C 110a: First driving circuit section 110b: Second driving circuit section 110c: Third driving circuit section 112a: First heat sink 112b: 2nd heat sink 112c: 3rd heat sink 114: Power input section 116a: First filter circuit section 116b: Second filter circuit section 116c: Third filter circuit section 118a: 1st blower fan 118b: 2nd blower fan 118c: 3rd blower fan 120a: 1st air guide 120b: Second air guide 120c: Third air guide 122a: First cover 1221a: First slit section 1222a: First extension part 1223a: First bend part 1224a: First slit 1225a: First connecting hole 122b: Second cover 1221b: Second slit section 1222b: Second extension 1223b: Second bend 1224b: Second slit 1225b: Second coupling hole

Claims

Claim 1 A case; a plurality of blower fans for cooling the internal temperature of the case; a plurality of air guides for guiding air generated from each of the plurality of blower fans; a plurality of first through holes formed parallel to one edge of the lower surface of the case and supplying air to each of the plurality of blower fans; a plurality of second through holes formed parallel to the other edge of the lower surface of the case and discharging internal air of the case to the outside of the case; a first cover disposed to surround the entire plurality of first through holes from the outside of the lower surface of the case and having a plurality of first slits formed therein; An electric range comprising: a second cover having a plurality of second slits formed therein, which is positioned to surround the entire plurality of second through holes on the outside of the lower surface of the case; wherein one end of each of the plurality of air guides is positioned adjacent to each of the plurality of blower fans, and the other end of each of the plurality of air guides is connected to each of the plurality of second through holes, and the shape of each of the plurality of second through holes corresponds to the shape of the other end of each of the plurality of air guides; wherein the first cover is positioned on one edge of the lower surface of the case, and the second cover is positioned on the other edge of the lower surface of the case, and the first cover and the second cover are positioned facing each other. Claim 2 An electric range according to claim 1, wherein the plurality of first slits prevent foreign matter from coming into contact with the plurality of blower fans. Claim 3 In paragraph 2, the foreign substance is an electric range, which is the extremity of the user's body. Claim 4 In paragraph 3, the electric range in which the plurality of blower fans are not formed with a structure to prevent contact with foreign substances. Claim 5 An electric range according to claim 1, wherein the plurality of first through holes are formed at the bottom of the plurality of blower fans, and the shape of each of the plurality of first through holes corresponds to the shape of the bottom surface of each of the plurality of blower fans. Claim 6 delete Claim 7 An electric range according to claim 1, wherein the first cover comprises: a first slit portion in which a plurality of first slits are formed; a plurality of first extension portions extending in the height direction from a plurality of ends of the first slit portion; and a plurality of first bend portions bent at each of the plurality of first extension portions. Claim 8 An electric range according to claim 7, wherein the first slit portion is positioned opposite to the lower surface of the case, and the plurality of first bend portions are connected to the lower surface of the case through screw connection. Claim 9 delete Claim 10 delete Claim 11 delete Claim 12 An electric range according to claim 1, wherein the second cover comprises: a second slit portion in which a plurality of second slits are formed; a plurality of second extension portions extending in the height direction from a plurality of ends of the second slit portion; and a plurality of second bend portions bent at each of the plurality of second extension portions. Claim 13 An electric range according to claim 12, wherein the second slit portion is positioned opposite the lower surface of the case, and the plurality of second bend portions are connected to the lower surface of the case through screw connection. Claim 14 delete Claim 15 An electric range according to claim 1, wherein the height of the first cover and the height of the second cover are the same. Claim 16 An electric range according to claim 1, wherein the first cover and the second cover reinforce the rigidity of the lower surface of the case to prevent sagging of the lower surface of the case. Claim 17 delete

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