A silent electric heating furnace

Abstract

The present invention relates to a silent electric heating furnace, comprising a main body, a panel and a bottom plate installed on the main body, a heating component installed under the panel, a heat insulation cover and a middle plate provided in the main body, the top of the heat insulation cover is open to form an inner cavity cover connected to the periphery of the heating component, and the middle plate is installed between the heat insulation cover and the bottom plate; a plurality of bottom plate air inlets are arranged on the bottom plate, a plurality of middle plate air inlets are arranged on the middle plate, a plurality of heat insulation cover air inlets are arranged on the heat insulation cover, and a plurality of air outlets are arranged on the top of the main body; the air outlet ends of the bottom plate air inlets are connected to the air inlet ends of the middle plate air inlets, and the air outlet ends of the middle plate air inlets are connected to the heat insulation cover air inlet and air outlet in turn to form a first self-heating channel. By arranging the first self-heating channel in the furnace body, the present invention enables the electric heating furnace to achieve natural convection heat dissipation without the need for fan heat dissipation, and the electric heating furnace no longer generates noise when operating, or even if fan heat dissipation is added, the fan speed can be greatly reduced, and the operating noise is greatly reduced.

Description

Technical Field

[0001] The invention relates to a silent electric heating furnace. Background Art

[0002] Commercially available electric stoves include ceramic stoves and induction cookers. Conventional electric stoves feature a panel and a heating element mounted on the panel. These elements generate high heat, which radiates into the stove body. Because the stove body also houses electrical components like circuit boards, the lifespan of these circuit boards is shortened in high-temperature environments. Therefore, electric stoves are typically equipped with a cooling fan and a heat shield covering the heating element.

[0003] For example, a multifunctional household electric stove disclosed in Chinese patent document No. CN110056916A includes a shell, a heating area is provided on the upper surface of the shell, and the electric stove also includes: a heat dissipation protective layer, a heating component and a heat insulation reflective plate; the heating component is arranged below the heating area, the heating component is provided with at least one layer of heating units, and the heating component is used to generate the heat required for heating the cookware; the heat dissipation protective layer is arranged between the heating area and the heating component, and the heat dissipation protective layer is used to absorb and transfer heat to the heating area; the heat insulation reflective plate is arranged on the bottom side of the heating component, and the heat insulation reflective plate is used to isolate and reflect heat to the heating area.

[0004] The purpose of setting up the heat insulation cover is to prevent the heat of the heating component from being directly radiated to the control board. The purpose of setting up the cooling fan is to generate a cooling airflow in the electric furnace to continuously dissipate heat for the circuit board. The noise caused by the high-speed operation of the fan affects the comfort when using the electric furnace and needs further improvement. Summary of the Invention

[0005] The object of the present invention is to provide a silent electric heating furnace which adopts natural heat dissipation, has good heat dissipation effect and low operating noise.

[0006] The object of the present invention is achieved like this:

[0007] A silent electric heater comprises a main body, a panel and a bottom plate installed on the main body, a heating component is installed under the panel, a heat insulation cover and a middle plate are provided in the main body, an open opening is provided on the top of the heat insulation cover to form an inner cavity cover connected to the periphery of the heating component, and the middle plate is installed between the heat insulation cover and the bottom plate; a plurality of bottom plate air inlet holes are arranged on the bottom plate, a plurality of middle plate air inlet holes are arranged on the middle plate, a plurality of heat insulation cover air inlet holes are arranged on the heat insulation cover, and a plurality of air outlet holes are provided on the top of the main body; the air outlet ends of the bottom plate air inlet holes are connected to the air inlet ends of the middle plate air inlet holes, and the air outlet ends of the middle plate air inlet holes are connected in sequence with the heat insulation cover air inlet holes and the air outlet holes to form a first self-heating channel.

[0008] The apertures of the middle plate air inlet holes and the heat insulation cover air inlet holes gradually decrease from the air inlet end to the air outlet end.

[0009] The air inlet hole of the middle plate and the air inlet hole of the heat insulation cover are arranged vertically, and the air outlet end of the air inlet hole of the bottom plate is connected through the spacing between the middle plate and the bottom plate, the air outlet end of the air inlet hole of the middle plate is abutted against the air inlet end of the air inlet hole of the heat insulation cover, and the abutting contact portion of the two holes is flush with each other, and the air outlet end of the air inlet hole of the heat insulation cover is connected to the air inlet end of the air outlet hole through the inner cavity of the heat insulation cover; the air inlet end of the air inlet hole of the heat insulation cover is provided with a mounting portion, and the air outlet end of the air inlet hole of the middle plate is inserted into the mounting portion.

[0010] The heat insulation cover is provided with an avoidance space at the connection position of the heating component corresponding to the heat insulation cover. The bottom surface of the avoidance space is flat, and the side portion is provided with a wiring hole for wiring the heating component.

[0011] The air inlet of the heat insulation cover is arranged outside the avoidance position of the heat insulation cover, the top of the heat insulation cover is connected with the air inlet end of some of the air outlet holes, the air inlet end of the heat insulation cover air inlet is connected with the air outlet end of some of the middle plate air inlet holes, forming a first self-heating channel, and the air outlet end of another part of the middle plate air inlet holes faces the outer bottom surface of the avoidance position and is connected with the air inlet end of another part of the air outlet holes, forming a second self-heating channel.

[0012] The bottom surface of the middle plate is provided with an upwardly concave middle plate concave portion, and the top surface of the bottom plate is provided with a downwardly concave bottom plate concave portion. The two concave portions are in an upper and lower structure and together constitute a circuit board accommodating cavity. The avoidance position and the accommodating cavity are respectively located on opposite sides of the main body.

[0013] There is a distance between the inner surface of the heat insulation cover and the outer surface of the heating component, and the distance between the inner surface and the outer surface of the heat insulation cover is less than 20 mm and greater than 1 mm.

[0014] The main body is provided with a plurality of first mounting columns extending downwards, and the heat insulation cover is mounted on the first mounting columns so as to be tightly pressed against the main body and located at the bottom of the panel.

[0015] The middle plate is provided with a plurality of second mounting columns, and the middle plate is mounted on the bottom of the upper heat insulation cover through the second mounting columns and is suspended above the bottom plate.

[0016] The air outlet holes are close to and distributed around the panel. A convex edge is provided at the edge of the top opening of the heat insulation cover. The convex edge is at least partially surrounded on the main body and at least surrounds the air inlet ends of part of the air outlet holes inside its cavity.

[0017] The heat insulation cover and the bottom plate form a drainage channel communicating with the air outlet and the bottom plate air inlet. The water inlet end of the drainage channel faces the air outlet, and the water outlet end faces the bottom plate air inlet.

[0018] Guide grooves are provided around the air inlet hole of the bottom plate corresponding to the water outlet end of the drainage channel.

[0019] The drainage channel includes a first water receiving trough, a first drainage trough, a second water receiving trough and a second drainage trough; the heat insulation cover is basin-shaped and is connected to the inner top of the main body, and the first water receiving trough and the first drainage trough are arranged around the opening on the top of the heat insulation cover; the first water receiving trough is arranged below the air outlet, and the first drainage trough is arranged on the first water receiving trough, the drainage inlet of the first drainage trough faces upward and is connected to the first drainage trough, and the drainage outlet of the first drainage trough faces downward and is connected to the air inlet of the bottom plate.

[0020] The outer side of the first water receiving trough is higher than the inner side, the second water receiving trough is arranged inside the heat insulation cover, and the second drainage trough is arranged at the bottom of the heat insulation cover. The horizontal height of the second water receiving trough is higher than the second drainage trough and is close to the inner side of the first water receiving trough. The second drainage trough is provided with a heat insulation cover air inlet hole, and the heat insulation cover air inlet hole at this location is connected to the bottom plate air inlet hole.

[0021] The second water receiving trough is provided with a drainage trough facing the second drainage trough.

[0022] The middle plate is located above the bottom plate and below the first drainage groove and the second drainage groove. The middle plate is provided with a plurality of raised edges to form a middle plate water receiving groove. The middle plate air inlet holes have different heights. The drainage outlet and the heat insulation cover air inlet holes are respectively facing the middle plate water receiving grooves and are connected with the bottom plate air inlet holes through the middle plate air inlet holes with the lowest height. The bottom plate air inlet holes connected with the middle plate air inlet holes are provided with guide grooves around them.

[0023] The present invention provides first and second self-heating channels in the furnace body, so that the electric heating furnace can achieve heat dissipation by natural convection without the need for fan heat dissipation. The electric heating furnace no longer generates noise when working. Even if fan heat dissipation is added, the fan speed can be greatly reduced, and the working noise is greatly reduced.

[0024] The present invention provides a drainage channel in the furnace body, which can discharge the liquid entering from the air outlet to the air inlet hole of the bottom plate, and then discharge it out of the furnace body, thereby preventing the liquid from accumulating in the furnace body and burning other electrical components in the electric furnace. Moreover, the drainage channel does not affect the air intake and exhaust of the air inlet hole and the air outlet hole of the bottom plate, and does not affect the heat dissipation of the electric furnace.

[0025] The present invention can be widely applied to various electric heating stove products such as induction cookers and electric ceramic stoves.

[0026] Additional aspects and advantages of the present invention will become apparent in the following description, as well as being learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a cross-sectional view of the assembly of the first embodiment of the present invention Figure 1 .

[0028] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0029] Figure 3 for Figure 1 Enlarged view of point B in the middle.

[0030] Figure 4 Decomposition of the first embodiment of the present invention Figure 1 .

[0031] Figure 5 Decomposition of the first embodiment of the present invention Figure 2 .

[0032] Figure 6 This is a cross-sectional view of the assembly of the first embodiment of the present invention Figure 2 . DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] See also Figures 1-6 The silent electric heater comprises a main body 1, a panel 2 and a bottom plate 3 installed on the main body 1, a heating component 4 is installed under the panel 2, and a heat insulation cover 5 and a middle plate 6 are provided inside the main body 1. The main body 1 and the heat insulation cover 5 can adopt an integral structure or a split structure as shown in this embodiment, and the main body 1 and the middle plate 6 can adopt an integral structure or a split structure as shown in this embodiment, which can be understood by those skilled in the art. The main body 1 is provided with a control component electrically connected to the heating component 4 and the circuit board (not shown). The top of the heat shield 5 is provided with an open opening 55 and forms an inner cavity cover connected to the periphery of the heating component 4. The middle plate 6 is installed between the heat shield 5 and the bottom plate 3. The bottom plate 3 is provided with a plurality of bottom plate air inlet holes 31, the middle plate 6 is provided with a plurality of middle plate air inlet holes 61, the heat shield 5 is provided with a plurality of heat shield air inlet holes 51, and the top of the main body 1 is provided with a plurality of air outlet holes 11. The air outlet ends of the bottom plate air inlet holes 31 are connected to the air inlet ends of the middle plate air inlet holes 61, and the air outlet ends of the middle plate air inlet holes 61 are connected in sequence to the heat shield air inlet holes 51 and the air outlet holes 11 to form a first self-heating channel. The first self-heating channel forms a bottom-up airflow circulation channel. The air inlet ends of the bottom plate air inlet holes 31 are connected to the outside world near the bottom of the main body 1, and the air outlet ends of the air outlet holes 11 are connected to the outside world near the top of the main body 1.

[0035] When the electric heater is working, the heating component 4 generates heat and radiates it into the main body 1. Under the shielding effect of the heat insulation cover 5 and the middle plate 6, the electric heater is divided into three temperature layers from top to bottom with gradually decreasing temperature. The air outlet 11 is located at the top of the main body 1, at the highest point. The bottom plate air inlet 31 is opened on the bottom plate 3, at the lowest point. The heat insulation cover air inlet 51 and the middle plate air inlet 61 are located inside the main body 1, between the two. According to the principle of hot air rising, an airflow from bottom to top will be generated inside the electric heater. The airflow enters from the bottom plate air inlet 31, then flows through the first self-heating channel, and then flows out from the air outlet 11, thereby realizing natural convection heat dissipation. The airflow path is as shown in FIG. Figure 2 As shown, through the above technical solution, the electric heater can dissipate heat inside the electric heater without the help of a fan. The electric heater generates no noise when working, and can effectively protect the circuit board in a lower working environment, thereby ensuring its working stability and practical life. In addition, since there is an airflow inside the heat insulation cover 5 for continuous natural convection heat dissipation, the temperature inside the heat insulation cover 5 will not continue to rise even if the heating component 4 works for a long time, which can also effectively protect the heating component 4 from long-term stable operation.

[0036] Alternatively, even if a fan (not shown) is added to the electric stove to dissipate heat (the fan generates a cooling airflow for active heat dissipation), the dual cooling solution can effectively and significantly reduce the fan speed and operating noise. The technical solution of adding a fan to the electric stove is particularly suitable for long-term use scenarios, such as boiling medicine, braising, stewing or other cooking methods that last for a long time.

[0037] Furthermore, the apertures of the middle plate air inlet holes 61 and the heat shield air inlet holes 51 gradually decrease from the air inlet end to the air outlet end. In this embodiment, the middle plate air inlet holes 61 and the heat shield air inlet holes 51 are conical holes. These holes can also be replaced with trumpet-shaped holes, trapezoidal holes, polygonal conical holes (such as triangular conical holes), etc., as will be understood by those skilled in the art. By adopting this technical solution, when air flows through the middle plate air inlet holes 61 and the heat shield air inlet holes 51 and enters the heat shield 5, the structural design of the middle plate air inlet holes 61 and the heat shield air inlet holes 51, which is larger on the outside and smaller on the inside, increases the pressure of the incoming cold air flow, further promoting the temperature difference between the cold and hot air, achieving better heat dissipation and further promoting convection between the cold and hot air. This pressure difference can also effectively prevent the high heat of the heating component 2 during operation from radiating to the outside of the heat shield 5 through the heat shield air inlet holes 51, further ensuring a relatively lower operating temperature inside the electric furnace.

[0038] Furthermore, the middle plate air inlet 61 and the heat shield air inlet 51 are arranged vertically, which conforms to the use of bottom-up convection heat dissipation, reduces the resistance of air flow, and improves the speed and intensity of air flow. The air outlet end of the bottom plate air inlet 31 is connected by the spacing between the middle plate 6 and the bottom plate 3. The cross-sectional area of ​​the spacing is much larger than the total area of ​​the air outlet end of the bottom plate air inlet 31, which also helps to reduce the resistance of air flow. The air outlet end of the middle plate air inlet 61 is abutted against the air inlet end of the heat shield air inlet 51, and the abutting contact portion of the two holes is flush with each other, such as Figure 2 As shown, the connection between the two is excessively smooth, which also helps reduce the resistance of airflow. The outlet end of the heat shield air inlet 51 is connected to the air inlet end of the air outlet 11 through the inner cavity of the heat shield 5. The cross-sectional area of ​​the inner cavity of the heat shield 5 is also much larger than the total area of ​​the air outlet ends of the heat shield air inlet 51 and the total area of ​​the air inlet ends of the air outlet 11, which also helps reduce the resistance of airflow. The air inlet end of the heat shield air inlet 51 is provided with a mounting portion 511, and the air outlet end of the middle plate air inlet 61 is inserted into the mounting portion 511. The mounting portion 511 can play a guiding role, so that the middle plate air inlet 61 can be more smoothly inserted into the heat shield air inlet 51 through the mounting portion 511, thereby improving assembly efficiency. It can also ensure that the heat shield air inlet 51 and the middle plate air inlet 61 arranged in groups can be aligned with each other, ensuring air circulation and reducing wind resistance.

[0039] Furthermore, the heat insulation cover 5 is provided with an avoidance space 52 at the wiring location corresponding to the heating component 4. The avoidance space 52 has a flat bottom surface and a wiring hole 53 for wiring the heating component 4 is opened on the side. The wiring location of the heating component 4 often has a large gap, so it will radiate more heat to the outside. Therefore, the heat insulation cover 5 is provided with an avoidance space 52 with a flat bottom surface (that is, the heat insulation cover air inlet hole 51 is not provided), which can effectively prevent the high heat of the heating component 4 from radiating from there to the inside of the electric furnace.

[0040] Furthermore, the heat insulation cover air inlet holes 51 are arranged outside the avoidance position 52 of the heat insulation cover 5, and air flow can enter the interior of the heat insulation cover 5 from these heat insulation cover air inlet holes 51 and flow away to take away excess heat to achieve heat dissipation. Since the avoidance position 52 is set, there is no direct entry of air flow into the avoidance position 52, and the heating component 4 will radiate more heat here, so it is necessary to set a second self-heating channel to dissipate heat from the avoidance position 52. The heat dissipation principle is also to use natural convection to dissipate heat. The technical solution is specifically as follows: the top of the heat insulation cover 5 is connected to the air inlet end of part of the air outlet holes 11, and the air inlet end of the heat insulation cover air inlet hole 51 is connected to the air outlet end of part of the middle plate air inlet hole 61, forming a first self-heating channel (specially for heat dissipation inside the heat insulation cover 5), and the air outlet end of the other part of the middle plate air inlet hole 61 is facing the outer bottom surface of the avoidance position 52 (such as Figure 3As shown, the air flow is blown toward the outer bottom surface of the space 52), and is connected to the air inlet end of the other part of the air outlet 11 to form a second self-heating channel (specifically for cooling the space 52), which can be understood by those skilled in the art.

[0041] Furthermore, the bottom surface of the middle plate 6 is provided with a middle plate recess 62 that is concave upward, and the top surface of the bottom plate 3 is provided with a bottom plate recess 32 that is concave downward. The two recesses are in an upper and lower structure and together constitute a circuit board accommodating cavity 100, which can make full use of the space of the furnace body 1. The avoidance position 52 and the accommodating cavity 100 are respectively located on opposite sides of the main body 1. For example, the avoidance position 52 is located on the middle front side of the main body 1, and the accommodating cavity 100 is located on the rear side of the main body 1. The distance between the two is relatively far, which can avoid heat from being directly transferred to the circuit board, ensuring that the circuit board is in a lower working environment.

[0042] Furthermore, there is a distance between the inner surface of the heat insulation cover 5 and the outer surface of the heating component 4. The larger the distance, the better the heat dissipation effect. In particular, when the natural air convection from bottom to top is used for heat dissipation, when the distance exceeds the thickness of the thermal boundary layer of the heat radiating outward from the heating component 4, the gap outside the thermal boundary layer will produce air turbulence, so that an air flow protection layer is formed around the thermal boundary layer. The natural air convection from bottom to top cannot directly take away the heat in the thermal boundary layer, resulting in a worse heat dissipation effect. Therefore, the distance of the technical solution is preferably less than 20mm and greater than 1mm. The thickness of this distance is preferably less than 20mm and greater than 1mm. It can be ensured that the distance between the two is slightly smaller than or close to the thickness of the thermal boundary layer of the heat radiated outward by the heating component 4. Of course, it can be further optimized to 5-10mm, that is, the smaller the distance thickness, the thinner the thermal boundary layer that can actually be formed (thinner than the thickness of the thermal boundary layer of the heat radiated outward by the heating component 4 normally). By artificially adjusting the distance between the two, it is equivalent to compressing the actual thickness of the thermal boundary layer of the heat radiated outward by the heating component 4. The natural air convection from the bottom to the top can directly take away the heat in the thermal boundary layer. The heat temperature in the thermal boundary layer is higher, and it has a greater tendency to rise rapidly by convection, and the heat dissipation effect is better, overcoming technical bias.

[0043] Similarly, even when active heat dissipation is adopted (such as using a fan component to generate a heat dissipation airflow for blowing toward the heat insulation cover 5 and the heating component 4), the heat dissipation airflow of active heat dissipation can directly take away the heat in the thermal boundary layer, which can also improve the heat dissipation effect.

[0044] Furthermore, the spacing distance gradually increases from bottom to top, and the diameter of the opening 55 gradually increases from bottom to top. This technical solution helps to improve the effect of hot air rising from bottom to top, thereby reducing the resistance of hot air rising, accelerating natural air convection from bottom to top, and improving the heat dissipation effect.

[0045] Furthermore, the main body 1 is provided with a plurality of first mounting columns 12 extending downward, and the heat shield 5 is mounted on the first mounting columns 12, thereby being pressed tightly against the main body 1 and located at the bottom of the panel 2; the middle plate 6 is provided with a plurality of second mounting columns 60, and the middle plate 6 is mounted on the bottom of the upper heat shield 5 through the second mounting columns 60 and suspended above the bottom plate 3. They are preferably mounted with screws to the first and second mounting columns. Those skilled in the art can understand that the installation is simple and ensures that there is an appropriate distance between the heat shield 5 and the middle plate 6, and an appropriate distance between the middle plate 6 and the bottom plate 3.

[0046] Furthermore, the air outlet holes 11 are close to and distributed around the panel 2. The temperature near the air outlet holes 11 will be higher and the temperature difference with the air inlet holes 31 of the bottom plate will be greater, and the natural convection effect will be better. A convex edge 54 is provided at the edge of the top opening of the heat insulation cover 5. The convex edge 54 is at least partially surrounded on the main body 1, and at least the air inlet end of part of the air outlet holes 11 is surrounded inside its cavity to ensure unidirectional flow in the first self-heating channel.

[0047] Furthermore, the heat shield 5 and the bottom plate 3 form a drainage channel that connects the air outlet 11 and the bottom plate air inlet 31. The water inlet end of the drainage channel faces the air outlet 11 to receive liquid entering the furnace body from the air outlet 11, and the water outlet end faces the bottom plate air inlet 31 to guide the liquid to the bottom plate air inlet 31 and discharge it out of the furnace body from the bottom plate air inlet 31, thereby preventing liquid from accumulating in the furnace body and burning other electrical components in the electric furnace, such as the heating element 6 and the circuit board. Moreover, the water inlet and water outlet ends of the drainage channel, by facing the air outlet 11 and the bottom plate air inlet 31, receive water and drain water without affecting the air intake and exhaust of the bottom plate air inlet 31 and the air outlet 11, and thus do not affect the heat dissipation of the electric furnace.

[0048] Furthermore, guide grooves 311 are provided around the bottom plate air inlet hole 31 corresponding to the water outlet end of the drainage channel, which can guide the liquid out more quickly and prevent the liquid from falling onto the circuit board arranged near the bottom plate 3.

[0049] Furthermore, the drainage channel includes a first water receiving trough 56, a first drainage trough 57, a second water receiving trough 58 and a second drainage trough 59; the heat insulation cover 5 is basin-shaped and is connected to the inner top of the main body 1, and the heating component 4 is located in the heat insulation cover 5. The first water receiving trough 56 and the first drainage trough 57 are arranged around the opening 55 at the top of the heat insulation cover 5. After the liquid enters the furnace body, it will be discharged from the heat insulation cover 5 through the first water receiving trough 56 and the first drainage trough 57, and the liquid will not contact the heating component 4; the first water receiving trough 56 is arranged below the air outlet 11, and the first drainage trough 57 is arranged on the first water receiving trough 56, and the drainage inlet 571 of the first drainage trough 57 faces upward and is connected to the first drainage trough 57, and the drainage outlet 572 of the first drainage trough 57 faces downward and is connected to the bottom plate air inlet 31. After the liquid enters the furnace body through the air outlet 11, it flows downward under the action of gravity. The first water receiving trough 58 located below the air outlet 11 can smoothly collect the liquid, and then it flows into the first drainage trough 59. It then flows through the drainage inlet 571 to the bottom plate air inlet 31 and then out of the furnace body. In this case, the first water receiving trough 58 is equivalent to the water inlet end of the drainage channel, and the drainage inlet 571 is equivalent to the water outlet end of the drainage channel.

[0050] Furthermore, the outer side of the first water receiving trough 56 is higher than the inner side. The second water receiving trough 58 is disposed inside the heat shield 5, and the second drainage trough 59 is disposed at the bottom of the heat shield 5. The second water receiving trough 58 is higher than the second drainage trough 59 and is closer to the inner side of the first water receiving trough 56. The second drainage trough 59 is provided with a heat shield air inlet 51, which is connected to the bottom plate air inlet 31. When liquid entering the furnace body through the air outlet 11 is not promptly discharged through the first water receiving trough 56 and the first drainage trough 57, the liquid will overflow into the second water receiving trough 58 under the action of gravity. After the second water receiving trough 58 receives the liquid, it will drain into the second drainage trough 59, and then flow through the aforementioned heat shield air inlet 51 to the bottom plate air inlet 31, thereby being discharged from the furnace body. In this case, the aforementioned heat shield air inlet 51 is equivalent to the water outlet end of the drainage channel.

[0051] In addition, the heating component 4 generates high heat when working. When a small amount of liquid enters the furnace body, it can be quickly heated and evaporated, which can be understood by those skilled in the art.

[0052] Furthermore, the second water receiving trough 58 is provided with a drainage groove 581 facing the second drainage trough 59, which can effectively prevent the liquid from flowing around in the second water receiving trough 58 without direction. By setting the drainage groove 581, the liquid is guided to flow in one direction to the second drainage trough 59, further avoiding contact between the liquid and the heating component 4.

[0053] Furthermore, the middle plate 6 is located above the bottom plate 3 and below the first and second drainage grooves 57 and 59. Several raised edges 63 are provided on the middle plate 6 to form a middle plate water receiving trough. The middle plate air inlet holes 61 are at varying heights. The drainage outlet 572 and the heat shield air inlet holes 51 face the middle plate water receiving trough and communicate with the bottom plate air inlet holes 31 through the lowest middle plate air inlet holes 61. Guide grooves 311 are provided around the bottom plate air inlet holes 31 that communicate with the middle plate air inlet holes 61. In this case, the middle plate air inlet holes 61 that communicate with the bottom plate air inlet holes 31 act as the outlet end of the drainage channel. The middle plate 3 plays a role of confluence, converging the liquid discharged from the drainage outlet 572 and the aforementioned heat insulation cover air inlet hole 51, and flowing to the bottom plate air inlet hole 31 through the aforementioned lowest middle plate air inlet hole 61 and thus discharged from the furnace body, which can more effectively ensure that the liquid will not come into contact with the circuit board located below the middle plate 3 and above the bottom plate 5.

[0054] The above is a preferred embodiment of the present invention, which shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A silent electric heating stove, comprising a main body (1), a panel (2) and a bottom plate (3) mounted on the main body (1), a heating component (4) mounted under the panel (2), characterized in that: The main body (1) is provided with a heat insulation cover (5) and a middle plate (6), the top of the heat insulation cover (5) is provided with an open opening (55) and forms an inner cavity cover connected to the periphery of the heating component (4), and the middle plate (6) is installed between the heat insulation cover (5) and the bottom plate (3); a plurality of bottom plate air inlet holes (31) are arranged on the bottom plate (3), a plurality of middle plate air inlet holes (61) are arranged on the middle plate (6), a plurality of heat insulation cover air inlet holes (51) are arranged on the heat insulation cover (5), and a plurality of air outlet holes (11) are provided on the top of the main body (1); the air outlet end of the bottom plate air inlet hole (31) is connected to the air inlet end of the middle plate air inlet hole (61), and the air outlet end of the middle plate air inlet hole (61) is connected to the heat insulation cover air inlet hole (51) and the air outlet hole (11) in sequence to form a first self-heating channel; The apertures of the middle plate air inlet hole (61) and the heat shield air inlet hole (51) gradually decrease from the air inlet end to the air outlet end; The middle plate air inlet (61) and the heat shield air inlet (51) are arranged vertically, the air outlet end of the bottom plate air inlet (31) is connected through the spacing between the middle plate (6) and the bottom plate (3), the air outlet end of the middle plate air inlet (61) is abutted against the air inlet end of the heat shield air inlet (51), and the abutting contact portion of the two holes is flush with each other, the air outlet end of the heat shield air inlet (51) is connected to the air inlet end of the air outlet (11) through the inner cavity of the heat shield (5); the air inlet end of the heat shield air inlet (51) is provided with a mounting portion (511), and the air outlet end of the middle plate air inlet (61) is inserted into the mounting portion (511).

2. The silent electric heating stove according to claim 1, characterized in that: The heat insulation cover (5) is provided with a space avoidance (52) at the connection point corresponding to the heating component (4); the space avoidance (52) has a flat bottom surface and a wiring hole (53) for wiring the heating component (4) is provided on the side.

3. The silent electric heating stove according to claim 2, characterized in that: The heat insulation cover air inlet (51) is arranged at a position outside the avoidance position (52) of the heat insulation cover (5), the top of the heat insulation cover (5) is connected to the air inlet end of a part of the air outlet (11), the air inlet end of the heat insulation cover air inlet (51) is connected to the air outlet end of a part of the middle plate air inlet (61), forming a first self-heating channel, and the air outlet end of another part of the middle plate air inlet (61) faces the outer bottom surface of the avoidance position (52) and is connected to the air inlet end of another part of the air outlet (11), forming a second self-heating channel.

4. The silent electric heating stove according to claim 2, characterized in that: The bottom surface of the middle plate (6) is provided with an upwardly concave middle plate concave portion (62), and the top surface of the bottom plate (3) is provided with a downwardly concave bottom plate concave portion (32). The two concave portions are in an upper and lower structure and together constitute a circuit board accommodating cavity (100). The avoidance position (52) and the accommodating cavity (100) are respectively located on opposite sides of the main body (1).

5. The silent electric heating stove according to claim 1, characterized in that: A distance is provided between the inner surface of the heat insulation cover (5) and the outer surface of the heating component (4), and the distance between the distance is less than 20 mm and greater than 1 mm.

6. The silent electric heating stove according to claim 1, characterized in that: The main body (1) is provided with a plurality of first mounting columns (12) extending downward, and the heat shield (5) is mounted on the first mounting columns (12), thereby being pressed tightly against the main body (1) and located at the bottom of the panel (2); the middle plate (6) is provided with a plurality of second mounting columns (60), and the middle plate (6) is mounted on the bottom of the upper heat shield (5) through the second mounting columns (60) and suspended above the bottom plate (3).

7. The silent electric heating stove according to claim 1, characterized in that: The air outlet holes (11) are close to and distributed around the panel (2), and a convex edge (54) is provided at the edge of the opening (55). The convex edge (54) is at least partially surrounded on the main body (1) and at least partially surrounds the air inlet end of the air outlet holes (11) inside its cavity.

8. The silent electric heating stove according to any one of claims 1 to 7, characterized in that: The heat insulation cover (5) and the bottom plate (3) form a drainage channel communicating with the air outlet (11) and the bottom plate air inlet (31); the drainage channel includes a first water receiving trough (56), a first drainage trough (57), a second water receiving trough (58) and a second drainage trough (59); the heat insulation cover (5) is basin-shaped and is connected to the inner top of the main body (1); the first water receiving trough (56) and the first drainage trough (57) are arranged on the periphery of the opening (55) at the top of the heat insulation cover (5); The first water receiving trough (56) is arranged below the air outlet (11), the first drainage trough (57) is arranged on the first water receiving trough (56), the drainage inlet (571) of the first drainage trough (57) faces upward and is connected to the first drainage trough (57), and the drainage outlet (572) of the first drainage trough (57) faces downward; the outer side of the first water receiving trough (56) is higher than the inner side, the second water receiving trough (58) is arranged inside the heat insulation cover (5), and the second drainage trough (59) is arranged at the bottom of the heat insulation cover (5), the horizontal height of the second water receiving trough (58) is higher than the second drainage trough (59) and is close to the inner side of the first water receiving trough (56), and the second drainage trough (59) is provided with a heat insulation cover. The cover air inlet (51) is provided with a drainage groove (581) facing the second drainage groove (59); the middle plate (6) is located above the bottom plate (3) and below the first drainage groove (57) and the second drainage groove (59); the middle plate (6) is provided with a plurality of raised edges (63) to form a middle plate water receiving groove; the middle plate air inlet (61) has different heights; the drainage outlet (572) and the heat insulation cover air inlet (51) are respectively oriented towards the middle plate water receiving groove and are connected to the bottom plate air inlet (31) through the middle plate air inlet (61) with the lowest height; the bottom plate air inlet (31) connected to the middle plate air inlet (61) is provided with a drainage groove (311) around it.

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