CN212430953U

CN212430953U - Mute electric heating furnace

Info

Publication number: CN212430953U
Application number: CN202020773830.9U
Authority: CN
Inventors: 黎伟文
Original assignee: Foshan City Shunde District Pufate Electric Appliance Industrial Co ltd
Current assignee: Foshan City Shunde District Pufate Electric Appliance Industrial Co ltd
Priority date: 2020-05-11
Filing date: 2020-05-11
Publication date: 2021-01-29
Anticipated expiration: 2030-05-11

Abstract

The utility model relates to a silent electric heating furnace, which comprises a main body, a panel and a bottom plate which are arranged on the main body, wherein a heating component is arranged under the panel, a heat shield and a middle plate are arranged in the main body, the top of the heat shield is opened to form an inner cavity which is covered and connected at the periphery of the heating component, and the middle plate is arranged between the heat shield and the bottom plate; a plurality of bottom plate air inlet holes are distributed in the bottom plate, a plurality of middle plate air inlet holes are distributed in the middle plate, a plurality of heat shield air inlet holes are distributed in the heat shield, and a plurality of air outlet holes are formed in the top of the main body; the air outlet end of the bottom plate air inlet hole is communicated with the air inlet end of the middle plate air inlet hole, and the air outlet end of the middle plate air inlet hole is sequentially communicated with the heat shield air inlet hole and the air outlet hole to form a first self-radiating channel. The utility model discloses a set up first from heat dissipation channel in the furnace body, make the electric heater can realize the heat dissipation of natural convection, need not with the help of fan heat dissipation, the electric heater during operation no longer produces the noise, perhaps, even increase fan heat dissipation, also can reduce fan speed by a wide margin, noise at work reduces by a wide margin.

Description

Mute electric heating furnace

Technical Field

The utility model relates to a silence electric heater.

Background

The types of electric heating furnaces on the market include electric ceramic furnaces, induction cookers, and the like. Conventional electric heater all has the panel to and set up the heating element on the panel, and the heating element during operation can produce the high fever, radiates in the electric heater main part, because still be equipped with electric components such as circuit board in the electric heater main part, the circuit board working life can shorten under high thermal environment, consequently, can set up radiator fan and cover the heat exchanger that separates of heat-generating body in the electric heater usually.

A multi-functional domestic electric heater as that chinese patent document No. CN110056916A discloses, including the casing, the upper surface of casing is provided with the heating region, and the electric heater still includes: the heat dissipation protective layer, the heating assembly and the heat insulation reflecting plate; the heating assembly is arranged below the heating area and is provided with at least one layer of heating unit, and the heating assembly is used for generating heat required by heating the cooker; the heat dissipation protective layer is arranged between the heating area and the heating assembly and used for absorbing and transferring heat to the heating area; the heat insulation reflecting plate is arranged at the bottom side of the heating assembly and used for insulating and reflecting heat to the heating area.

The purpose of arranging the heat shield is to avoid the direct radiation of the heat of the heating component to the control panel, the purpose of arranging the heat radiation fan is to continuously radiate heat for the circuit board in order to generate heat radiation airflow in the electric heating furnace, and the comfortable sensation when the high-speed running noise of the fan influences the use of the electric heating furnace needs to be further improved.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a silence electric heater, it adopts the natural heat dissipation, and the radiating effect is good, and noise at work is low.

The purpose of the utility model is realized like this:

a silent electric heating furnace comprises a main body, a panel and a bottom plate which are arranged on the main body, wherein a heating component is arranged below the panel, a heat shield and a middle plate are arranged in the main body, an open opening is formed in the top of the heat shield, an inner cavity is formed, the heat shield is connected to the periphery of the heating component in a covering mode, and the middle plate is arranged between the heat shield and the bottom plate; a plurality of bottom plate air inlet holes are distributed in the bottom plate, a plurality of middle plate air inlet holes are distributed in the middle plate, a plurality of heat shield air inlet holes are distributed in the heat shield, and a plurality of air outlet holes are formed in the top of the main body; the air outlet end of the bottom plate air inlet hole is communicated with the air inlet end of the middle plate air inlet hole, and the air outlet end of the middle plate air inlet hole is sequentially communicated with the heat shield air inlet hole and the air outlet hole to form a first self-radiating channel.

The aperture of the middle plate air inlet hole and the aperture of the heat shield air inlet hole are gradually reduced from the air inlet end to the air outlet end.

The middle plate air inlet hole and the heat shield air inlet hole are vertically arranged, the air outlet end of the bottom plate air inlet hole is connected through the space between the middle plate and the bottom plate, the air outlet end of the middle plate air inlet hole is connected with the air inlet end of the heat shield air inlet hole in an abutting mode, abutting contact parts of the two holes are in parallel and level butt joint, and the air outlet end of the heat shield air inlet hole is connected with the air inlet end of the air outlet hole through an inner cavity of the heat shield; the air inlet end of the air inlet hole of the heat shield is provided with an installation part, and the air outlet end of the middle plate air inlet hole is inserted into the installation part.

The junction of the heat shield corresponding to the heating component is provided with a clearance position, the bottom surface of the clearance position is flat, and the side part is provided with a wiring hole for wiring the heating component.

The heat shield air inlet hole is arranged at a position outside the avoidance position of the heat shield, the top of the heat shield is communicated with the air inlet end of part of the air outlet holes, the air inlet end of the heat shield air inlet hole is communicated with the air outlet end of part of the middle plate air inlet holes to form a first self-heat-dissipation channel, and the air outlet end of the other part of the middle plate air inlet holes faces the outer bottom surface of the avoidance position and is communicated with the air inlet end of the other part of the air outlet holes to form a second self-heat-dissipation channel.

The bottom surface of the middle plate is provided with an upward concave middle plate concave part, the top surface of the bottom plate is provided with a downward concave bottom plate concave part, the two concave parts are of an upper structure and a lower structure and jointly form a circuit board accommodating cavity, and the space avoiding position and the accommodating cavity are respectively positioned on two opposite sides of the main body.

Be equipped with the interval between heat exchanger internal surface and the heating element surface, the interval distance is less than 20mm and is greater than 1 mm.

The main part is provided with a plurality of first mounting columns extending downwards, and the heat shield is mounted on the first mounting columns, so that the heat shield is tightly pressed on the main part and is positioned at the bottom of the panel.

The medium plate is equipped with a plurality of second erection columns, and the medium plate passes through the second erection column and installs in the bottom of last heat exchanger, hangs the top of establishing at the bottom plate.

The exhaust vent is close to and distributes around the panel, and heat shield top opening edge is equipped with the chimb, the chimb is at least partly enclosed and is established in the main part to enclose the air inlet end of partial exhaust vent at least and establish it and hold the intracavity portion.

The heat insulation cover and the bottom plate form a drainage channel communicated with the air outlet hole and the air inlet hole of the bottom plate, the water inlet end of the drainage channel faces the air outlet hole, and the water outlet end of the drainage channel faces the air inlet hole of the bottom plate.

And a diversion trench is arranged around the air inlet hole of the bottom plate corresponding to the water outlet end of the drainage channel.

The drainage channel comprises a first water receiving tank, a first drainage tank, a second water receiving tank and a second drainage tank; the heat shield is basin-shaped and covers the inner top of the main body, and the first water receiving tank and the first water discharging tank are arranged on the periphery of an opening in the top of the heat shield; the first water receiving tank is arranged below the air outlet, the first water discharging tank is arranged on the first water receiving tank, a water discharging inlet of the first water discharging tank faces upwards and is communicated with the first water discharging tank, and a water discharging outlet of the first water discharging tank faces downwards and is communicated with the air inlet hole of the bottom plate.

The side in the first water receiving tank outside is higher than inboard side, the second water receiving tank sets up in the heat shield inside, the second water drainage tank sets up in the heat shield bottom, and the level of second water receiving tank is higher than the second water drainage tank, and is close to the inboard side of first water receiving tank, is equipped with the heat shield fresh air inlet on the second water drainage tank, and the heat shield fresh air inlet and the bottom plate fresh air inlet intercommunication of this department.

And a drainage groove facing the second water drainage groove is arranged on the second water receiving groove.

The middle plate is positioned above the bottom plate and below the first drainage groove and the second drainage groove, a plurality of raised surrounding edges are arranged on the middle plate to form a middle plate water receiving groove, the heights of the middle plate air inlet holes are different, and the drainage water outlet and the heat shield air inlet hole face the middle plate water receiving groove respectively and are communicated with the bottom plate air inlet hole through the middle plate air inlet hole with the lowest height; and flow guide grooves are arranged around the air inlet holes of the bottom plate communicated with the air inlet holes of the middle plate.

The utility model discloses a set up first, second in the furnace body from heat dissipation channel, make the electric heater can realize the heat dissipation of natural convection, need not with the help of the heat dissipation of fan, the electric heater during operation no longer produces the noise, perhaps, even increase the heat dissipation of fan, also can reduce fan speed by a wide margin, noise at work reduces by a wide margin.

The utility model discloses a set up drainage channel in the furnace body, drainage channel can be to the liquid advantage of following the exhaust vent and getting into and discharge to the bottom plate fresh air inlet to outside the discharge furnace body, avoid liquid to collect together in the furnace body and burn out other electrical components in the electric heat stove, drainage channel does not influence the bottom plate fresh air inlet in addition, the exhaust of exhaust vent, does not influence the heat dissipation of electric heat stove.

The utility model can be widely applied to electric furnace products such as various electromagnetic ovens, electric ceramic ovens and the like.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is an assembled sectional view 1 of a first embodiment of the present invention.

Fig. 2 is an enlarged view of a point a in fig. 1.

Fig. 3 is an enlarged view at B in fig. 1.

Fig. 4 is an exploded view 1 of the first embodiment of the present invention.

Fig. 5 is an exploded view 2 of the first embodiment of the present invention.

Fig. 6 is an assembled sectional view 2 of the first embodiment of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

Referring to fig. 1 to 6, the silent electric heating furnace includes a main body 1, a panel 2 and a bottom plate 3 mounted on the main body 1, a heating element 4 mounted below the panel 2, a heat shield 5 and a middle plate 6 disposed in the main body 1, the main body 1 and the heat shield 5 may be an integral structure or a separate structure as shown in this embodiment, and the main body 1 and the middle plate 6 may be an integral structure or a separate structure as shown in this embodiment, which can be understood by those skilled in the art. A control component electrically connected with the heating component 4 and a circuit board (not shown in the figure) is arranged on the main body 1, an open opening 55 is arranged at the top of the heat shield 5 and forms an inner cavity to be covered and connected at the periphery of the heating component 4, and the middle plate 6 is arranged between the heat shield 5 and the bottom plate 3; a plurality of bottom plate air inlet holes 31 are distributed on the bottom plate 3, a plurality of middle plate air inlet holes 61 are distributed on the middle plate 6, a plurality of heat shield air inlet holes 51 are distributed on the heat shield 5, and a plurality of air outlet holes 11 are arranged at the top of the main body 1; the air outlet end of the bottom plate air inlet hole 31 is communicated with the air inlet end of the middle plate air inlet hole 61, the air outlet end of the middle plate air inlet hole 61 is sequentially communicated with the heat shield air inlet hole 51 and the air outlet hole 11 to form a first self-heat-dissipation channel, and the first self-heat-dissipation channel forms an airflow circulation channel from bottom to top. The air inlet end of the bottom plate air inlet hole 31 is communicated with the outside near the bottom of the main body 1, and the air outlet end of the air outlet hole 11 is communicated with the outside near the top of the main body 1.

When the electric heating furnace works, the heating component 4 generates heat and radiates to the inside of the main body 1, under the shielding effect of the heat shield 5 and the middle plate 6, the electric heating furnace is divided into three temperature layers with gradually reduced temperature from top to bottom, the air outlet hole 11 is positioned at the top of the main body 1 and is at the highest point, the air inlet hole 31 of the bottom plate is arranged on the bottom plate 3 and is at the lowest point, the air inlet hole 51 of the heat shield and the air inlet hole 61 of the middle plate are positioned in the main body 1 and are positioned between the two, according to the principle of hot air rising, the inside of the electric heating furnace generates air flow from bottom to top, the air flow enters from the air inlet hole 31 of the bottom plate, then flows through the first self-radiating channel and then flows out from the air outlet hole 11, thereby realizing the natural convection radiating, the air flow path is shown in figure 2, by the technical scheme, the electric heating, in addition, even if the heating assembly 4 works for a long time, the temperature in the heat shield 5 can not rise ceaselessly, and the heating assembly 4 can be effectively protected to work stably for a long time.

Or even if a fan (not shown) is additionally arranged in the electric heating furnace for heat dissipation (the fan generates heat dissipation airflow for active heat dissipation), the rotating speed of the fan can be effectively and greatly reduced under the action of a double heat dissipation scheme, and the technical scheme of additionally arranging the fan in the electric heating furnace is particularly suitable for long-time use scenes such as medicine stewing, braising, stewing or other cooking modes which last for a long time.

Further, the aperture of the middle plate air inlet hole 61 and the aperture of the heat shield air inlet hole 51 become smaller gradually from the air inlet end to the air outlet end. The middle plate air inlet hole 61 and the heat shield air inlet hole 51 in this embodiment are conical holes, and they may be replaced by a flared hole, a trapezoidal hole, a polygonal tapered hole (such as a triangular tapered hole), and the like, which can be understood by those skilled in the art. Through adopting this technical scheme, when the air current passes through medium plate fresh air inlet 61, when heat exchanger fresh air inlet 51 gets into and separates heat exchanger 5, medium plate fresh air inlet 61, the structural design who separates heat exchanger fresh air inlet 51 big-end-up, make the cold air current pressure who gets into increase, further promote the difference in temperature degree of cold and hot air, the radiating effect is better, further promote the convection degree of cold and hot air, also because the existence of this pressure differential, can effectively prevent the high fever of the 2 during operations of heating element to see through the outside radiation that separates heat exchanger fresh air inlet 51 toward heat exchanger 5, further guarantee that the electric heater is inside to be in lower operating temperature relatively.

Furthermore, the middle plate air inlet holes 61 and the heat shield air inlet holes 51 are vertically arranged, so that the use of convection heat dissipation from bottom to top is met, the flowing resistance of air flow is reduced, the flowing speed and the flowing strength of the air flow are improved, the air outlet end of the bottom plate air inlet hole 31 is connected through the space between the middle plate 6 and the bottom plate 3, the sectional area of the space is far larger than the total area of the air outlet end of the bottom plate air inlet hole 31, the flowing resistance of the air flow is also favorably reduced, the air outlet end of the middle plate air inlet hole 61 is connected with the air inlet end of the heat shield air inlet hole 51 in an abutting mode, the abutting contact parts of the two holes are in flush butt joint, as shown in figure 2, the connection part of the two holes is excessively smooth, the flowing resistance of the air flow is also favorably reduced, the air outlet end of the heat shield air inlet hole 51 is connected with the air inlet end of the air outlet hole 11 through the inner cavity of the heat shield 5, the sectional, and also helps to reduce the resistance to airflow therethrough. The air inlet end that separates heat exchanger fresh air inlet 51 is equipped with installation department 511, in the installation department 511 was pegged graft to the air-out end of medium plate fresh air inlet 61, installation department 511 can play the guide effect, makes medium plate fresh air inlet 61 can insert more smoothly through installation department 511 in separating heat exchanger fresh air inlet 51, improves assembly efficiency, also can guarantee to separate heat exchanger fresh air inlet 51 and medium plate fresh air inlet 61 that set up in groups and can aim at each other, guarantees the circulation of air effect, reduces the windage.

Furthermore, the thermal shield 5 is provided with a space avoiding 52 at a connection position corresponding to the heating element 4, the space avoiding 52 has a flat bottom surface, the side part is provided with a wire passing hole 53 for routing the heating element 4, the connection position of the heating element 4 often has a larger gap, and thus more heat can be radiated to the outside, therefore, the thermal shield 5 is provided with the space avoiding 52 (namely, the thermal shield air inlet hole 51 is not provided) with a flat bottom surface, and the high heat of the heating element 4 can be effectively prevented from radiating from the space to the inside of the electric heating furnace.

Further, the heat shield air inlet holes 51 are arranged at positions outside the clearance 52 of the heat shield 5, and air flow can enter the heat shield 5 from the heat shield air inlet holes 51 and flow away to take away redundant heat to realize heat dissipation. After the clearance 52 is provided, the clearance 52 is directly entered without airflow, and the heating component 4 radiates more heat at this position, so that a second self-cooling channel needs to be provided to cool the clearance 52, the cooling principle is the cooling airflow cooling by natural convection, and the technical scheme is as follows: the top of the heat shield 5 is communicated with the air inlet end of part of the air outlet holes 11, the air inlet end of the heat shield air inlet hole 51 is communicated with the air outlet end of part of the middle plate air inlet holes 61 to form a first self-heat-dissipation channel (specially dissipating heat inside the heat shield 5), the air outlet end of the other part of the middle plate air inlet holes 61 faces the outer bottom surface of the vacancy avoiding position 52 (as shown in fig. 3, air flow blows to the outer bottom surface of the vacancy 52) and is communicated with the air inlet end of the other part of the air outlet holes 11 to form a second self-heat-dissipation channel (specially dissipating heat on the vacancy avoiding position 52), and all the people skilled in the art can understand the heat-.

Furthermore, the bottom surface of the middle plate 6 is provided with an upwardly concave middle plate concave part 62, the top surface of the bottom plate 3 is provided with a downwardly concave bottom plate concave part 32, the two concave parts are of an upper and lower structure and jointly form a circuit board accommodating cavity 100, the space of the furnace body 1 can be fully utilized, the clearance avoiding position 52 and the accommodating cavity 100 are respectively located on two opposite sides of the main body 1, if the clearance avoiding 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 clearance avoiding position 52 and the accommodating cavity 100 is far, heat can be prevented from being directly transferred to the circuit board.

Furthermore, a distance is arranged between the inner surface of the heat shield 5 and the outer surface of the heating element 4, the distance is not larger, the heat dissipation effect is better, especially when natural air convection heat dissipation from bottom to top is adopted, when the distance exceeds the thickness of a heat boundary layer of heat radiation from the heating element 4 to the outside, a gap outside the heat boundary layer generates an air flow turbulence phenomenon, an air flow protective layer is formed at the periphery of the heat boundary layer, the heat in the heat boundary layer cannot be directly taken away by the natural air convection from bottom to top, and the heat dissipation effect is rather poor, therefore, the distance of the technical scheme is preferably smaller than 20mm and larger than 1mm, the distance can ensure that the distance between the two is slightly smaller than or close to the thickness of the heat boundary layer of the heat radiation from the heating element 4 to the outside, and is further preferably 5-10mm, namely, the smaller the distance thickness, The thinner the thermal boundary layer (thinner than the thermal boundary layer thickness of the heating component 4 which normally radiates heat outwards) can be formed in practice, the distance between the two layers is adjusted manually, which is equivalent to compressing the actual thickness of the thermal boundary layer of the heating component 4 which radiates heat outwards, the heat in the thermal boundary layer can be directly taken away by natural air convection from bottom to top, the heat temperature in the thermal boundary layer is higher, the trend of the heat in the thermal boundary layer is more rapid and the heat radiation effect is better, and the technical bias is overcome.

Similarly, even when active heat dissipation (for example, when a fan assembly is used to generate a heat dissipation airflow for blowing toward the heat shield 5 and the heat generating assembly 4) is adopted, the heat dissipation airflow for active heat dissipation can directly take away the heat in the thermal boundary layer, and the heat dissipation effect can also be improved.

Further, the distance between the openings gradually increases from bottom to top, and the aperture of the opening 55 gradually increases from bottom to top. The technical scheme is helpful to improving the effect of the hot air rising from bottom to top, thereby reducing the rising resistance of the hot air, accelerating the natural air convection from bottom to top and improving the heat dissipation effect.

Further, a plurality of first mounting columns 12 extending downwards are arranged on the main body 1, and the heat shield 5 is mounted on the first mounting columns 12 so as to be tightly pressed on 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, the middle plate 6 is mounted at the bottom of the upper heat shield 5 through the second mounting columns 60 and is suspended above the bottom plate 3, and the mounting of the middle plate 6 and the first and second mounting columns can be preferably realized through screws.

Further, the exhaust vent 11 is close to and distributes around panel 2, and near the exhaust vent 11 the temperature can be higher, bigger with the difference in temperature of bottom plate fresh air inlet 31, and natural convection effect is better, separates 5 open-top edges of heat exchanger and is equipped with chimb 54, chimb 54 encloses at least partially to establish on main part 1 to enclose the air inlet end of part exhaust vent 11 at least and establish in its appearance intracavity portion, guarantee first from heat dissipation channel's one-way flow.

Further, the heat insulation cover 5 and the bottom plate 3 form a drainage channel which is communicated with the air outlet hole 11 and the bottom plate air inlet hole 31. The water inlet end of the drainage channel faces the air outlet hole 11 and is used for receiving liquid entering the interior of the furnace body from the air outlet hole 11, the water outlet end of the drainage channel faces the bottom plate air inlet hole 31 and is used for guiding the liquid to the bottom plate air inlet hole 31 and discharging the liquid out of the furnace body from the bottom plate air inlet hole 31, so that the phenomenon that other electric elements in the electric heating furnace, such as the heating assembly 6 and a circuit board, are burnt due to the accumulation of the liquid in the furnace body is avoided, the water is received and drained by the water inlet end and the water outlet end of the drainage channel in a mode of facing the air outlet hole 11 and the bottom plate air inlet hole 31, air intake and exhaust of the bottom plate air inlet hole 31 and the air.

Furthermore, the diversion trench 311 is disposed around the air inlet hole 31 of the bottom plate corresponding to the water outlet end of the drainage channel, so as to guide and discharge the liquid more quickly and prevent the liquid from falling onto the circuit board disposed near the bottom plate 3.

Further, the drainage channel comprises a first water receiving tank 56, a first drainage tank 57, a second water receiving tank 58 and a second drainage tank 59; the heat insulation cover 5 is basin-shaped and covers the inner top of the main body 1, the heating component 4 is positioned in the heat insulation cover 5, the first water receiving tank 56 and the first water draining tank 57 are arranged on the periphery of the opening 55 on the top of the heat insulation cover 5, liquid enters the furnace body and then is discharged from the heat insulation cover 5 through the first water receiving tank 56 and the first water draining tank 57, and the liquid cannot contact with the heating component 4; the first water receiving tank 56 is arranged below the air outlet 11, the first water discharging tank 57 is arranged on the first water receiving tank 56, a water discharging inlet 571 of the first water discharging tank 57 faces upwards and is communicated with the first water discharging tank 57, and a water discharging outlet 572 of the first water discharging tank 57 faces downwards and is communicated with the bottom plate air inlet 31. After entering the furnace body through the air outlet 11, the liquid flows downwards under the action of gravity, and the first water receiving tank 58 positioned below the air outlet 11 can smoothly receive the liquid, then flows into the first water discharging tank 59, flows to the bottom plate air inlet 31 through the water discharging water inlet 571 and is discharged out of the furnace body. At this time, the first water receiving tank 58 corresponds to the water inlet end of the drainage channel, and the drainage water inlet 571 corresponds to the water outlet end of the drainage channel.

Further, the side of the outer side of the first water receiving groove 56 is higher than the side of the inner side, the second water receiving groove 58 is arranged inside the heat shield 5, the second water discharging groove 59 is arranged at the bottom of the heat shield 5, the horizontal height of the second water receiving groove 58 is higher than that of the second water discharging groove 59 and is close to the side of the inner side of the first water receiving groove 56, the second water discharging groove 59 is provided with a heat shield air inlet 51, and the heat shield air inlet 51 at the position is communicated with the bottom plate air inlet 31. When the liquid entering the furnace body from the air outlet 11 is not discharged through the first water receiving tank 56 and the first water discharging tank 57 in time, the liquid overflows to the second water receiving tank 58 under the action of gravity, and after the second water receiving tank 58 receives the liquid, the liquid is discharged onto the second water discharging tank 59 and flows to the bottom plate air inlet 31 through the heat shield air inlet 51 so as to be discharged out of the furnace body. At this time, the air inlet hole 51 of the heat shield corresponds to the water outlet end of the water discharge channel.

In addition, the heating component 4 generates high heat when working, when a small amount of liquid enters the furnace body, the liquid can be quickly heated and evaporated, and all the persons skilled in the art can understand that

Further, be equipped with the drainage groove 581 towards second water receiving tank 59 on the second water receiving tank 58, can prevent effectively that liquid from having the non-directional flow of everywhere in second water receiving tank 58, through setting up drainage groove 581 guide liquid unilateralism flow to second water receiving tank 59, further avoid liquid and heating element 4 to contact.

Further, the middle plate 6 is located above the bottom plate 3 and below the first and second

water discharge slots

57 and 59, the middle plate 6 is provided with a plurality of protruding surrounding edges 63 to form a middle plate water receiving slot, the height of the middle plate air inlet holes 61 is different, the water discharge outlet 572 and the heat shield air inlet holes 51 face the middle plate water receiving slot respectively and are communicated with the bottom plate air inlet holes 31 through the middle plate air inlet holes 61 with the lowest height, and the peripheries of the bottom plate air inlet holes 31 communicated with the middle plate air inlet holes 61 are provided with flow guide slots 311. At this time, the middle plate air inlet holes 61 communicated with the bottom plate air inlet holes 31 correspond to the water outlet end of the drainage channel. The middle plate 3 plays a role of converging, liquid discharged from the water discharge outlet 572 and the heat shield air inlet 51 is converged and flows to the bottom plate air inlet 31 through the middle plate air inlet 61 with the lowest height so as to be discharged out of the furnace body, and liquid can be effectively prevented from contacting with a circuit board below the middle plate 3 and above the bottom plate 5.

The foregoing is a preferred embodiment of the present invention showing and describing the basic principles, main features and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to illustrate the principles of the invention, but rather that various changes and modifications may be made without departing from the spirit and scope of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A silent electric heating furnace comprises a main body (1), a panel (2) and a bottom plate (3) which are installed on the main body (1), wherein a heating component (4) is installed below the panel (2), and the silent electric heating furnace is characterized in that a heat insulation cover (5) and a middle plate (6) are arranged in the main body (1), the top of the heat insulation cover (5) is provided with an open opening (55) and forms an inner cavity to be covered on 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 distributed on the bottom plate (3), a plurality of middle plate air inlet holes (61) are distributed on the middle plate (6), a plurality of heat shield air inlet holes (51) are distributed on the heat shield (5), and a plurality of air outlet holes (11) are arranged at the top of the main body (1); the air outlet end of the bottom plate air inlet hole (31) is communicated with 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 sequentially communicated with the heat shield air inlet hole (51) and the air outlet hole (11) to form a first self-radiating channel.

2. The electric heating furnace of claim 1, wherein the diameters of the middle plate air inlet holes (61) and the heat shield air inlet holes (51) are gradually reduced from the air inlet end to the air outlet end.

3. The silent electric heating furnace of claim 1, wherein the middle plate air inlet holes (61) and the heat shield air inlet holes (51) are vertically arranged, the air outlet ends of the bottom plate air inlet holes (31) are connected through the space between the middle plate (6) and the bottom plate (3), the air outlet ends of the middle plate air inlet holes (61) are connected with the air inlet ends of the heat shield air inlet holes (51) in an abutting mode, abutting contact parts of the two holes are in flush butt joint, and the air outlet ends of the heat shield air inlet holes (51) are connected with the air inlet ends of the air outlet holes (11) through the inner cavity of the heat shield (5); the air inlet end of the heat shield air inlet hole (51) is provided with an installation part (121), and the air outlet end of the middle plate air inlet hole (61) is inserted into the installation part (121).

4. The silent electric heating furnace of claim 1, wherein the heat shield (5) is provided with a space (52) corresponding to the connection of the heating component (4), the bottom of the space (52) is flat, and the side of the space is provided with a wiring hole (53) for wiring the heating component (4).

5. The silent electric heating furnace of claim 4, wherein the heat shield air inlet holes (51) are arranged at positions outside the vacancy avoiding positions (52) of the heat shield (5), the top of the heat shield (5) is communicated with the air inlet ends of part of the air outlet holes (11), the air inlet ends of the heat shield air inlet holes (51) are communicated with the air outlet ends of part of the middle plate air inlet holes (61) to form a first self-heat-dissipation channel, and the air outlet ends of the other part of the middle plate air inlet holes (61) face to the outer bottom surface of the vacancy avoiding positions (52) and are communicated with the air inlet ends of the other part of the air outlet holes (11) to form a second self-heat-dissipation channel.

6. The electric heating furnace of claim 4, wherein the bottom surface of the middle plate (6) is provided with an upwardly concave middle plate concave part (62), the top surface of the bottom plate (3) is provided with a downwardly concave bottom plate concave part (32), the two concave parts are of an up-and-down structure and jointly form a circuit board accommodating cavity (100), and the space avoiding part (52) and the accommodating cavity (100) are respectively positioned at two opposite sides of the main body (1).

7. A silent electric heating furnace as claimed in claim 1, characterized in that a distance is provided between the inner surface of the heat shield (5) and the outer surface of the heating element (4), said distance being less than 20mm and greater than 1 mm.

8. A silent electric heating stove as claimed in claim 1, characterized in that the main body (1) is provided with a plurality of first mounting posts (12) extending downwards, and the heat shield (5) is mounted on the first mounting posts (12) so as to press against the main body (1) and is 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 at the bottom of the upper heat shield (5) and is suspended above the bottom plate (3) through the second mounting columns (60).

9. The silent electric heating furnace of claim 1, wherein the air outlet holes (11) are arranged near and around the panel (2), a flange (54) is arranged at the edge of the opening (55), the flange (54) at least partially surrounds the main body (1), and at least the air inlet end of part of the air outlet holes (11) is surrounded in the cavity.

10. A silent electric heating furnace as claimed in any one of claims 1 to 9, wherein the heat insulating cover (5) and the bottom plate (3) form a water drainage channel which is communicated with the air outlet hole (11) and the air inlet hole (31) of the bottom plate; the drainage channel comprises a first water receiving groove (56), a first drainage groove (57), a second water receiving groove (58) and a second drainage groove (59); the heat insulation cover (5) is basin-shaped and covers the inner top of the main body (1), and the first water receiving tank (56) and the first water discharging tank (57) are arranged on the periphery of an opening (55) in the top of the heat insulation cover (5); the first water receiving tank (56) is arranged below the air outlet (11), the first water discharging tank (57) is arranged on the first water receiving tank (56), a water discharging inlet (571) of the first water discharging tank (57) faces upwards and is communicated with the first water discharging tank (57), and a water discharging outlet (572) of the first water discharging tank (57) faces downwards; the lateral side of the outer side of the first water receiving groove (56) is higher than the lateral side of the inner side of the first water receiving groove, the second water receiving groove (58) is arranged inside the heat insulation cover (5), the second water discharging groove (59) is arranged at the bottom of the heat insulation cover (5), the horizontal height of the second water receiving groove (58) is higher than that of the second water discharging groove (59) and is close to the lateral side of the inner side of the first water receiving groove (56), and the second water discharging groove (59) is provided with a heat insulation cover air inlet hole (51); a drainage groove (581) facing the second drainage groove (59) is arranged on the second water receiving groove (58); the middle plate (6) is positioned above the bottom plate (3) and below the first drainage groove (57) and the second drainage groove (59), a plurality of raised surrounding edges (63) are arranged on the middle plate (6) to form a middle plate water receiving groove, the heights of the middle plate air inlet holes (61) are different, and the drainage water outlet (572) and the heat shield air inlet holes (51) face the middle plate water receiving groove respectively and are communicated with the bottom plate air inlet holes (31) through the middle plate air inlet hole (61) with the lowest height; and flow guide grooves (311) are arranged on the periphery of the bottom plate air inlet holes (31) communicated with the middle plate air inlet holes (61).