CN213630562U - Electric heating device and electric furnace - Google Patents

Abstract

The utility model discloses an electric heating device, which comprises a heating panel, a heating film, a heat insulation component, an electrode and a fixed shell; the heating film is attached to the lower side of the heating panel, the heat insulation component is provided with a heat insulation cavity with an opening at the upper side and matched with the shape of the heating film, and the heating film is covered by the heat insulation cavity; the electrode is connected with the heating film electricity, and the set casing is equipped with upside open-ended and is used for holding the shell chamber of heat-proof component, and the upper end of set casing passes through bonding material and is connected with heating panel to fix heat-proof component at the heating film downside, heating panel's border or turn-ups connecting portion are installation location portion. Compared with the prior art, the heating component of the electric heating device adopts the heating film, the overall structure of the product is simpler, the overall thickness is thinner, and the requirement of thinning can be met; because the heating film is attached to the heating panel in advance, the assembly is very quick. The utility model also provides an electric stove of using above-mentioned electric heater unit.

Description

Electric heating device and electric furnace

Technical Field

The utility model relates to an electric stove technical field, concretely relates to electric heater unit and electric stove.

Background

The electric ceramic stove on the existing market generally comprises a machine shell, a machine core and a panel, wherein the machine core comprises a heating disc and a machine core base, the machine core base comprises a base upper cover, a base side shell, a base bottom cover, a cooling fan, a circuit board and the like, the panel is arranged on the upper side of the heating disc, in operation, the heat generated by a heating body in the heating disc heats the panel, and the panel heats placed articles. The electric ceramic stove has wide application, has the functions of boiling water, frying, roasting, chafing dish, stir-frying, heating milk, cooking soup, stewing slowly and the like, and is very popular with consumers.

The traditional electric ceramic furnace core does not consider the combination of a heating disc and a panel, so that the structure of the core and a shell is complex, the shell needs to be provided with a bottom plate with a lower side capable of opening a shell cavity, the panel needs to be fixedly arranged on an installation step at the upper end of the shell cavity, the core is arranged from the shell cavity to the upper part, the upper end of the heating disc is pressed against the lower side of the panel through an elastic supporting piece between a base of the core and the heating disc, and the structure scheme is complex in structure and troublesome to install; and the casing needs to be designed into an upper opening and a lower opening, and a connecting structure is also needed to be designed between the bottom plate and the lower end of the casing, so that the structure of the casing is complex, for example, the bottom opening is designed on the casing of the ceramic electric ceramic furnace, and the manufacturing cost and the process are high.

With the improvement of the process, the electric ceramic furnace core and the electric ceramic furnace disclosed in chinese patent document CN109539338A, the connecting part is arranged at the upper end of the heating plate shell, and the panel is connected with the connecting part through the bonding material, so that the panel can be directly fixed on the heating plate, compared with the existing mode of connecting the heating plate and the panel by adopting the elastic support member, on one hand, the structure and the size of the electric ceramic furnace core are simplified, and the whole electric ceramic furnace core is more compact; because the panel snap-on is on the dish that generates heat, when assembling to electric ceramic stove, need not fix the panel on the casing installation step of electric ceramic stove earlier, consequently can adopt the mode of installing downwards from electric ceramic stove casing top, realize the fixed of core through the cooperation of panel or connecting portion and installation step, not only simplify the installation procedure, the bottom plate that can open need not design in electric ceramic stove chassis bottom moreover to reduction in production cost. However, the electric ceramic stove core adopts the traditional heating wire, so that the thickness is large, and the light and thin design is difficult to realize.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an it is not enough that prior art is overcome to an aim at, provides a structure succinct, and the assembly is swift, frivolous electric heater unit, the utility model discloses a technical scheme as follows:

the electric heating device comprises a heating panel, a heating film, a heat insulation component, an electrode and a fixed shell; the heating film is attached to the lower side of the heating panel, and the heat insulation component is provided with a heat insulation cavity with an opening at the upper side and used for covering the heating film; the electrode is connected with the heating film electricity, and the set casing is equipped with upside open-ended and is used for holding the shell chamber of thermal-insulated component, and the upper end of set casing is equipped with outside turn-ups connecting portion that extends, and turn-ups connecting portion pass through bonding material and are connected with heating panel to fix thermal-insulated component at the heating film downside, heating panel's border or turn-ups connecting portion are installation location portion.

Compared with the prior art, the heating component of the electric heating device adopts the heating film, the overall structure of the product is simpler, the overall thickness is thinner, and the requirement of thinning can be met; the heating film is attached to the heating panel in advance, so that the assembly is very quick; the heating panel or the flanging connecting part is matched with the machine shell for installation, so that the installation process is simplified, and the machine shell can be not provided with an openable bottom plate, so that the production cost is reduced.

Preferably, the flanging connecting part is provided with an electric connection notch, the electric connection notch extends inwards to the upper end of the side wall of the fixed shell, the electrode is provided with an electric connection terminal, and the electric connection terminal extends to the electric connection notch. The power connection notch is arranged to facilitate power connection of the electrode, and meanwhile, the thickness of the power connection notch plays a role in protecting the power connection terminal; the electrical contact gap extends to the upper end of the side wall of the fixed casing to prevent the upper end of the side wall of the fixed casing from pressing on the electrode. The electric connection gap has another function that the alignment of the electric connection gap and the electric connection terminal can be used for assembling and positioning the heat insulation cavity and the heating film of the heat insulation component.

Preferably, the electrical contact notch extends inwardly through the upper end of the side wall of the fixed shell. Therefore, the upper end of the fixing shell is prevented from abutting against the compression joint terminal, and the damage to the butt joint terminal is avoided.

Preferably, the power connection structure further comprises an insulating barrier for covering the power connection notch, the insulating barrier comprises an outer blocking wall which is matched with the width of the power connection notch and has a preset length, and a wiring channel is formed between the outer blocking wall and the outer wall of the fixed shell. Set up insulating barrier spare, can prevent to connect the electrical terminal position and expose and lead to electrocute hidden danger, can also play the effect of covering, promote the aesthetic property and the integrated level of product.

Specifically, insulating barrier still including locating the side wall that keeps off the relative both sides of wall outward, two sides keep off the wall and have length difference with outer wall to make outer fender wall upper portion can assemble in connecing the electric breach, two sides keep off and form between wall and the set casing outer wall with outer wall and walk the line passageway.

Preferably, two side retaining walls are equipped with outside extension's card edge with set casing outer wall complex one side, the set casing outer wall corresponds two card edges and is equipped with the cassette, form between cassette and the set casing outer wall and supply the card along vertical male draw-in groove, two side retaining walls upper end outsides are equipped with the location arch, turn-ups connecting portion correspond the location arch in the both sides of connecing the electric breach and are equipped with the clip, insulating barrier spare passageway card is along inserting the draw-in groove upwards assembling to the protruding clip of buckling in location makes insulating barrier spare fix at turn-ups connecting portion downside. With this construction, the insulating barrier can be assembled and disassembled very quickly for maintenance.

The utility model also provides another kind of electric heater unit, including heating panel, the heating film, heat insulating part, electrode and set casing, the heating film is attached to the heating panel downside, and heat insulating part is equipped with the heat insulating chamber that upside open-ended is used for the shroud heating film, and the electrode is connected with the heating film electricity, and the set casing is equipped with upside open-ended and is used for holding heat insulating part's shell chamber, and the upper end of set casing passes through bonding material to be connected with heating panel, thereby fixes heat insulating part at the heating film downside, and the border of heating panel extends the set casing upper end outside and forms installation location portion. The difference between this scheme and the first scheme lies in that the upper end of the set casing of this scheme does not set up the turn-ups connecting portion, but directly is connected with the heating panel, can reach the effect of first scheme equally.

Preferably, the electrode is provided with an electric terminal, the outer side of the fixed shell is provided with an electric gap corresponding to the electric terminal, and the electric terminal extends to the electric gap.

Preferably, the power connection notch vertically penetrates through the upper end and the lower end of the fixed shell.

Preferably, the power connection structure further comprises an insulating barrier for covering the power connection notch, the insulating barrier comprises an outer blocking wall which is matched with the width of the power connection notch and has a preset length, and a wiring channel is formed between the outer blocking wall and the outer wall of the fixed shell.

Preferably, the power connection notch is provided with a clamping groove penetrating through the lower end of the fixed shell, and the insulating barrier is inserted into the clamping groove to be assembled at the power connection notch.

The other electrode arrangement scheme is that the electrode is provided with an electric terminal which extends to the outer side of the fixed shell.

In both embodiments of the electric heating device, the following further comprises the following improvements:

the width of the bonding part between the upper end of the fixed shell and the heating panel is more than 2.5 mm. Preferably 2.5mm to 10mm, in which the stability of the connection is ensured and the economy is balanced.

The upper end of the fixed shell is provided with a groove body, and the bonding material is at least partially filled in the groove body. Set up like this and can improve the bonding effect between bonding material and heating panel and the set casing, be convenient for moreover the bonding material adhere to on the corresponding connecting portion of set casing upper end.

Another electricity connection scheme of the electric heating device is that the electrode is provided with an electricity connection terminal which is positioned in the fixed shell, and the electric heating device also comprises a power supply lead which is electrically connected with the electricity connection terminal and extends out of the outer side of the fixed shell.

The heating film is the rectangle, and the thermal-insulated chamber sets up to being the rectangle correspondingly, and the electrode still includes electrode connecting portion, and electrode connecting portion length adaptation ground is connected in the relative both sides of heating film, connects electrical terminal to be connected with electrode connecting portion, and turn-ups connecting portion correspond electrical terminal to be equipped with two and connect the electric breach. The rectangular heating film is adopted, the resistivity between opposite sides is the same, and the heating temperature is uniform.

The bottom wall of the heat insulation cavity is provided with a temperature measuring element, and the temperature measuring element and the heating film are separated by a preset distance. The temperature measuring element and the thick film heating element are separated by a preset distance, the temperature detected by the temperature measuring element is closer to the overall temperature of the heating film under the heat transfer effect of gas in the heat insulation cavity, and the detection precision is high.

The electrodes are of a material which is easily soldered and attached to the heating panel to facilitate welding of power supply leads at the ends of the electrical terminals.

One power connection scheme is as follows: the electrode is made of easily-soldered material, the power supply lead is welded on the power connection terminal, and the power supply lead is wired from the wiring channel.

The other power connection scheme is as follows: the power supply wire is connected with a power connection element, the power connection element is tightly pressed by the insulation blocking piece and is electrically connected with the power connection terminal, and the power supply wire is wired from the wiring channel. By adopting the power connection scheme, the connection between the power connection element and the power connection terminal is very efficient and quick.

The heating film is a graphene heating film or a thick film heating film.

The upper part of the fixed shell is provided with a plurality of clasps for installation. The electric heating device is more quickly installed by arranging the clasp.

An electric furnace applying the electric heating device of the first scheme comprises a machine shell and the electric heating device, wherein the machine shell is provided with a furnace chamber with an opening at the upper side, an assembling step is arranged around the opening of the furnace chamber, and the edge or the flanging connecting part of a heating panel of the electric heating device is arranged on the assembling step. Adopt the electric heater unit of this patent, the whole thickness of electric stove is more frivolous, can satisfy frivolous demand, through heating panel or turn-ups connecting portion and the installation of assembly step cooperation, has simplified the installation procedure, and the casing can not design the bottom plate that can open to reduction in production cost.

Preferably, the border of heating panel extends and forms installation location portion outside the turn-ups connecting portion, and turn-ups connecting portion downside is equipped with a plurality of clips, and when the border of heating panel was installed on the assembly step, the clip was extruded and was crossed the assembly step and detained thereby making electric heater unit and casing link firmly at assembly step downside. The electric heating device is connected with the assembly step through the clasp, and the assembly operation is simple, convenient and fast.

Another assembly scheme of the electric heating device is as follows: the electric heating device further comprises a connecting ring piece, the connecting ring piece comprises a ring wall inserted into the opening of the furnace chamber and a clamping edge annularly arranged on the outer side of the upper end of the ring wall, the ring wall of the connecting ring piece is inserted into the opening of the furnace chamber, the clamping edge is connected with the assembling step through a bonding material, the electric heating device is assembled in the ring wall, and the installing and positioning part of the electric heating device is assembled on the upper side of the clamping edge. Some machine cases, such as ceramic, cast iron cases, etc., are affected by temperature, impurities, etc. during manufacturing, and the shrinkage ratio can be changed, so that the accuracy of the size of the opening of the furnace chamber is not high, and the reject ratio is affected; these factors can cause a large assembly error between the electric heating device and the housing, which affects assembly efficiency and aesthetics. Some stamped and formed housings also present precision issues. The connection ring piece of this patent can pass through the mould preparation, and the precision is high, and the above-mentioned problem of solution that can be fine through the linking of connecting the ring piece because can guarantee electric heater unit's assembly quality as long as fix at the assembly step through the card edge, can make the great casing of opening error of some furnace chambeies like this, also can satisfy the assembly requirement. In addition, the connecting ring piece can play a role in heat insulation, and if the connecting ring piece is made of materials with good heat insulation performance such as bakelite and the like, the heat insulation is better.

Preferably, the border of heating panel extends outside turn-ups connecting portion, and turn-ups connecting portion downside is equipped with a plurality of clips, and the border of heating panel forms installation location portion, and when the border of heating panel was installed on the card edge, the clip was buckled and is established on the rampart. Make assembly and dismantlement maintenance efficiency high, convenient and fast through the clip.

Preferably, the annular wall is provided with a buckle port corresponding to the buckle, and the buckle is buckled on the top wall of the buckle port.

Preferably, the clasp includes a downwardly extending resilient connecting portion connected to the cuff connecting portion and a wedge hook portion provided at an end of the resilient connecting portion.

An electric furnace applying the electric heating device of the second scheme comprises a machine shell and the electric heating device, wherein the machine shell is provided with a furnace chamber with an opening at the upper side, an assembling step is arranged around the opening of the furnace chamber, and the edge of a heating panel of the electric heating device is arranged on the assembling step.

Preferably, the outer side of the upper part of the fixed shell is provided with a plurality of clasps, and when the edge of the heating panel is installed on the assembly step, the clasps are extruded to cross the assembly step and are buckled on the lower side of the assembly step, so that the electric heating device is fixedly connected with the machine shell. The electric heating device is connected with the assembly step through the clasp, and the assembly operation is simple, convenient and fast.

Another assembly scheme of the electric heating device is as follows: the electric heating device further comprises a connecting ring piece, the connecting ring piece comprises a ring wall inserted into the opening of the furnace chamber and a clamping edge annularly arranged on the outer side of the upper end of the ring wall, the ring wall of the connecting ring piece is inserted into the opening of the furnace chamber, the clamping edge is connected with the assembling step through a bonding material, the electric heating device is assembled in the ring wall, and the installing and positioning part of the electric heating device is assembled on the upper side of the clamping edge. The technical effect of the connecting ring is described above.

Preferably, the outer side of the upper part of the fixed shell is provided with a plurality of hooks, and when the edge of the heating panel is arranged on the clamping edge, the hooks are buckled on the annular wall. The buckle hook is arranged on the annular wall. Make assembly and dismantlement maintenance efficiency high, convenient and fast through the clip.

Preferably, the annular wall is provided with a buckle port corresponding to the buckle, and the buckle is buckled on the top wall of the buckle port.

Drawings

FIG. 1 is a perspective view of an electric heating apparatus according to embodiments 1 to 2

FIG. 2 is a sectional view of an electric heating apparatus according to embodiments 1 to 2

FIG. 3 is an exploded view of an electric heating apparatus according to examples 1 to 2

FIG. 4 is an exploded view of the heating apparatus of examples 1 to 2 in an inverted state

FIG. 5 is a bottom perspective view of the electric heating apparatus according to embodiments 1 to 2

FIG. 6 is a bottom view of the heating panel

FIG. 7 is a perspective view of a heat insulating member

FIG. 8 is a perspective view of a fixing case of embodiments 1 to 2

FIG. 9 is a bottom perspective view of an electric heating apparatus according to embodiment 2

FIG. 10 is a partial exploded view showing an upside-down state of an electric heating apparatus according to example 2

FIG. 11 is a perspective view of a blocking member according to example 2

FIG. 12 is a perspective view of an electric stove

FIG. 13 is an exploded view of an electric furnace

FIG. 14 is a sectional view of an electric furnace according to example 7

FIG. 15 is an exploded view of the electric furnace of example 8

FIG. 16 is a sectional view of an electric furnace in example 8

FIG. 17 is a perspective view of a connecting ring

FIG. 18 is a bottom perspective view of an electric heating apparatus according to embodiment 4

FIG. 19 is an exploded view of an electric heating apparatus according to example 4

FIG. 20 is a bottom perspective view of another embodiment of the electric heating apparatus of example 4

FIG. 21 is a bottom partial exploded view of another embodiment of the electric heating apparatus of example 4

FIG. 22 is an exploded view of another embodiment of the electric heating apparatus of example 4

FIG. 23 is an exploded view of an electric heating apparatus according to example 5

FIG. 24 is a bottom perspective view of an electric heating apparatus according to example 5

FIG. 25 is a sectional view of embodiment 10

Detailed Description

The technical solution of the present invention is described below with reference to the accompanying drawings and specific embodiments.

Example 1:

referring to fig. 1 to 8, the electric heating device H includes a heating panel 1, a heat generating film 2, a heat insulating member 3, an electrode E, and a fixing case 4; the heating film 2 is attached to the lower side of the heating panel 1, the heat insulation component 3 is provided with a heat insulation cavity 300 with an opening at the upper side and matched with the heating film 2 in shape, and the heating film 2 is covered by the heat insulation cavity 300; electrode E is connected with heating film 2 electricity, and set casing 4 is equipped with the shell chamber that upside open-ended is used for holding thermal-insulated component 3, and the upper end of set casing 4 is equipped with outside turn-ups connecting portion 401 that extends, and turn-ups connecting portion 401 is connected with heating panel 1 through bonding material to fix thermal-insulated component 3 at heating film 2 downside, heating panel 1's border or turn-ups connecting portion 401 are installation location portion.

Compared with the prior art, the heating component of the electric heating device H adopts the heating film 2, the overall structure of the product is simpler, the overall thickness is thinner, and the requirement of thinning can be met; the heating film 2 is attached to the heating panel 1 in advance, so that the assembly is very quick; the heating panel 1 or the flanging connecting part 401 is matched with the machine shell for installation, so that the installation process is simplified, and the machine shell can be not provided with an openable bottom plate, thereby reducing the production cost.

In a preferred embodiment, the flange connection 401 is provided with an electrical contact notch 4011, the electrode E is provided with an electrical contact E01, and the electrical contact E01 extends to the electrical contact notch 4011. The electrical contact gap 4011 is provided to facilitate electrical contact of the electrode E, and the thickness of the electrical contact gap 4011 protects the electrical contact terminal E01. In addition, the electrical connection gap 4011 has another function that the alignment of the electrical connection gap 4011 and the electrical connection terminal E01 can be used for assembling and positioning the heat insulation chamber 300 of the heat insulation component 3 and the heat generating film 2. Since the shape of the heat insulating chamber 300 is adapted to the heat generating film 2, the fitting condition of the heat insulating chamber 300 and the heat generating film 2 cannot be observed outside the heat insulating member 3, and it is more difficult to judge the orientation particularly for the heat insulating member 3 having a circular shape, which increases the cost if the heat insulating member 3 and the heat insulating panel 1 are provided, and also has a problem of accuracy. This patent can well solve above-mentioned problem through the counterpoint of connecing electric breach 4011 and electrical connection terminal E01.

In a preferred embodiment, electrical gap 401 extends inward to the upper end of the side wall of stationary housing 4, so as to prevent damage to electrical terminal E01 caused by the upper end of stationary housing 4 pressing against electrical terminal E01.

In a preferred embodiment, the heating film 2 is rectangular, the electrode E further comprises an electrode connecting part E02, the electrode connecting part E02 is connected to two opposite sides of the heating film 2 in a length-adaptive manner, the electric terminal E01 is connected to the electrode connecting part E02, and the flanging connecting part 401 is provided with two electric notches 4011 corresponding to the electric terminal E01. The rectangular heating film 2 is adopted, the resistivity between opposite sides is the same, and the heating temperature is uniform.

Referring to fig. 2 to 7, in a preferred embodiment, a temperature measuring element T is mounted on the bottom wall of the heat insulating chamber 300, and the temperature measuring element T is spaced from the heat generating film 2 by a predetermined distance. The temperature measuring element T is separated from the thick film heating element by a preset distance, and the temperature detected by the temperature measuring element T is closer to the overall temperature of the heating film 1 under the heat transfer effect of the gas in the heat insulation cavity 300, so that the detection precision is high.

Specifically, the bottom wall of the heat insulation cavity 300 is provided with a through hole 301, the bottom wall of the fixed shell 4 is provided with a counter bore 402 communicated with the upper surface of the fixed shell, and the temperature measuring element T sequentially penetrates through the counter bore 402 and the through hole 301 to be assembled on the bottom wall of the heat insulation cavity 300.

In a preferred embodiment, the electrodes E are of a solderable material that is attached to the heating panel 1 to facilitate welding of the power supply leads at the ends of the electrical terminals E01. The attachment of a solderable material to the heating panel 1 is prior art and will not be described in detail here.

The electric connection terminal E01 can be electrically connected to a power supply contact, a power supply spring, or the like, in addition to being connected by welding a power supply lead.

In a preferred embodiment, the heating film 2 is a graphene heating film or a thick film heating film, and is an existing heating circuit. The process of attaching the heat generating film 2 to the heating panel 1 is a prior art and will not be described in detail herein.

In a preferred embodiment, the width of the bonding portion of the upper end of the set cover to the heating panel is 2.5mm to 10 mm. Within this size range, the stability of the connection is ensured, while the economy is balanced.

In a preferred embodiment, the upper side of the burring joint 401 is provided with a groove 4010, and the bonding material is at least partially filled in the groove 4010. This arrangement can improve the adhesion effect between the adhesive material and the heating panel 1 and the burring attachment 401, and facilitates the adhesion of the adhesive material to the burring attachment 401.

The heating panel 1 is typically a glass-ceramic or quartz-glass plate, but other high temperature resistant and heat conductive panels known in the art are also possible.

The adhesive material of the patent is generally a known adhesive material commonly used for electronic components, such as electronic silica gel.

Referring to fig. 1 to 8, a plurality of hooks 403 for mounting are provided on the lower side of the burring connecting portion 401. The electric heating means H is installed more quickly by providing a clasp 403. The hooks 403 are typically provided in more than 3 to secure the connection.

Referring to fig. 8, the clasp 403 includes a downwardly extending elastic connection 4031 connected to the cuff connection 401, and a wedge 4032 provided at an end of the elastic connection 4031, and the wedge 4032 includes a guide slope 40321, and a fastening portion 40322 provided between an upper side of the guide slope 40321 and the elastic connection 4031.

Referring to fig. 11, when the electric heating apparatus H is mounted on the housing 5 from the lower side, and a certain force is applied to press the hook 403 downward, and the guide slope 40321 abuts against the edge of the mounting step 5011, the elastic connection 4031 is elastically deformed, so that the wedge-shaped hook 4032 passes over the mounting step 5011, the elastic connection 4031 is reset to allow the hook 40322 to be fastened to the lower side of the mounting step 5011, so that the vertical degree of freedom of the heating panel 1 is limited, and since the horizontal degree of freedom of the heating panel 1 is limited by the side wall of the mounting step 5011, the mounting and fixing of the electric heating apparatus H to the housing 5 is achieved.

Example 2:

referring to fig. 9 to fig. 11, the present embodiment is different from embodiment 1 in that the present embodiment further includes an insulating barrier 6 for covering the power connection notch 4011, the insulating barrier 6 includes an outer blocking wall 601 with a preset length and adapted to the width of the power connection notch 4011, and a routing channel 60 is formed between the outer blocking wall 601 and the outer wall of the fixed housing 4. Set up insulating barrier spare 6, can prevent to connect electrical terminal E01 position and expose and lead to electrocution hidden danger, can also play the effect of hiding, promote the aesthetic property and the integrated level of product.

In a preferred embodiment, the insulation barrier 6 further includes side walls 602 disposed on two opposite sides of the outer wall 601, and the two side walls 602 and the outer wall 601 have a length difference, so that the upper portion of the outer wall 601 can fit into the electrical connection notch 4011, and the two side walls 602 and the outer wall 601 form a routing channel 60 with the outer wall of the fixing housing 4. The width of the side barrier 602 is adapted to the depth of the electrical connection notch 4011, so that the outer side of the assembled insulation barrier 6 is aligned with the outer edge of the flange connection part 401, and the product is more beautiful.

In a preferred embodiment, the side of the two side blocking walls 602, which is matched with the outer wall of the fixed shell 4, is provided with a clamping rim 6021 extending outwards, the outer wall of the fixed shell 4 is provided with a clamping seat 404 corresponding to the two clamping rims 6021, a clamping groove 4040 for the clamping rim 6021 to be inserted vertically is formed between the clamping seat 404 and the outer wall of the fixed shell 4, the outer side of the upper end of the two side blocking walls 602 is provided with a positioning protrusion 6022, the flange connecting part 401 is provided with a clasp 405 corresponding to the positioning protrusion 6022 at two sides of the power connection notch 4011, and the insulating blocking part 6 channel clamping rim 6021 is inserted into the clamping groove 4040 and is assembled upwards until the positioning protrusion 6022 clasps the clasp 405 so that the insulating blocking part 6 is fixed. With this structure, the assembly and disassembly maintenance of the insulating barrier 6 is very quick.

The structure of the clasp 405 can be referred to in example 1.

One power connection scheme is as follows: the electrode is made of easily-soldered material, and the power supply lead is welded to the electric connecting terminal E01 and is routed from the routing channel 60.

The other power connection scheme is as follows: the power supply wire is connected with an electrical connection element (not shown), the electrical connection element is pressed by the insulation barrier 6 to be electrically connected with the electrical connection terminal E01, and the power supply wire is routed through the routing channel 60. With this electrical connection scheme, the electrical connection of the electrical connection element to the electrical connection terminal E01 is very efficient and quick.

Example 3:

this embodiment (not shown in the drawings) differs from embodiments 1 and 2 in that the electrical terminal E01 of the electrode E is located inside the stationary housing 4, and in that it further comprises a power supply lead electrically connected to the electrical terminal E01, which extends outside the stationary housing 4. Other technical features can be seen in examples 1 and 2.

Example 4:

referring to fig. 6, 7, 18 and 19, the electric heating device H of the present embodiment includes a heating panel 1, a heating film 2, a heat insulating member 3, an electrode E and a fixing shell 4, the heating film 2 is attached to the lower side of the heating panel 1, the heat insulating member 3 is provided with a heat insulating cavity 300 with an upper opening for covering the heating film 2, the electrode E is electrically connected to the heating film 2, the fixing shell 4 is provided with a shell cavity with an upper opening for accommodating the heat insulating member 3, the electrode E is provided with an electric connection terminal E01, the outer side of the fixing shell 4 is provided with an electric connection notch 4011 corresponding to the electric connection terminal E01, the electric connection terminal E01 extends to the electric connection notch 4011, the upper end of the fixing shell 4 is connected to the heating panel 1 through an adhesive material, so as to fix the heat insulating member 3 at the lower side of the heating film 2, and the edge 101 of the.

The difference between this solution and embodiment 1 is that the upper end of the fixing shell 4 of this embodiment is not provided with a flanged connection portion, but is directly connected to the heating panel 1, and the same effect as embodiment 1 can be achieved. Some technical effects of the present embodiment can be reflected from embodiments 1 and 2.

In a preferred embodiment, the width of the portion where the upper end of the fixing case 4 is bonded to the heating panel 1 is 2.5mm to 10 mm. Within this size range, the stability of the connection is ensured, while the economy is balanced.

In a preferred embodiment, the fixing case 4 is provided at an upper end thereof with a groove 4010, and an adhesive material is at least partially filled in the groove 4010. The arrangement can improve the bonding effect between the bonding material and the heating panel 1 and the fixing shell 4, and the bonding material is convenient to be attached to the corresponding connecting part at the upper end of the fixing shell 4.

In a preferred embodiment, the heating film 2 is rectangular, the heat insulation chamber 300 is correspondingly configured to be rectangular, the electrode E further comprises an electrode connecting part E02, the electrode connecting part E02 is connected to two opposite sides of the heating film 2 in a length-adaptive manner, the electric terminal E01 is connected to the electrode connecting part E02, and the fixing shell 4 is provided with two electric notches corresponding to the electric terminal E01. The rectangular heating film 2 is adopted, the resistivity between opposite sides is the same, and the heating temperature is uniform.

In one embodiment, the electrodes E are of a solderable material that is attached to the heating panel 1 to facilitate welding of the power conductors at the ends of the electrical terminals E01.

In another embodiment, the electrode E is a solderable material and the electrical terminal E01 is soldered with a power conductor that is routed from the routing channel 60.

The heating film 2 is preferably a graphene heating film or a thick film heating film.

In a preferred embodiment, the upper part of the stationary housing 1 is provided with a number of hooks (not shown) for mounting. The electric heating means H is installed more quickly by providing a clasp 403. The structure of the clasp can be understood with reference to example 1.

Referring to fig. 20 to 22, in a preferred embodiment, the electrical connection notch 4011 vertically penetrates through the upper end and the lower end of the fixed shell 4, and further includes an insulating barrier 6 for covering the electrical connection notch 4011, the insulating barrier 6 includes an outer blocking wall 601 with a preset length and adapted to the width of the electrical connection notch 4011, and a routing channel 60 is formed between the outer blocking wall 601 and the outer wall of the fixed shell 4. Set up insulating barrier spare 6, can prevent to connect electrical terminal E01 position and expose and lead to electrocution hidden danger, can also play the effect of hiding, promote the aesthetic property and the integrated level of product.

In a preferred embodiment, the electrical connection notch 4011 is provided with a clamping groove 4040 penetrating through the lower end of the stationary case 4, and the insulation barrier 6 is inserted into the clamping groove to be assembled at the electrical connection notch 4011. The assembly, disassembly and maintenance of the insulating barrier 6 with the clamping groove 4040 are very quick. Specifically, the insulating barrier 6 further includes side blocking walls 602 disposed on two opposite sides of the outer blocking wall 601, the two side blocking walls 602 and the outer blocking wall 601 have a length difference, so that the upper portion of the outer blocking wall 601 can be assembled in the electrical connection notch 4011, and the routing channel 60 is formed between the two side blocking walls 602 and the outer blocking wall 601 and the outer wall of the fixing shell 4. The width of the side barrier 602 is adapted to the depth of the electrical connection notch 4011, so that the outer side of the assembled insulation barrier 6 is aligned with the outer edge of the flange connection part 401, and the product is more beautiful.

The two side walls 602 have outwardly extending lips 6021 on one side thereof, and the lips 6021 are vertically inserted into the slots 4040 when installed.

In another power connection scheme, a power connection element is connected to the power supply lead, the power connection element is pressed by the insulating barrier 6 to be electrically connected with the power connection terminal E01, and the power supply lead is routed through the routing channel 60. With this electrical connection scheme, the electrical connection of the electrical connection element to the electrical connection terminal E01 is very efficient and quick.

Example 5:

referring to fig. 23 and 24, the present embodiment is different from embodiment 4 in that the upper end of the fixing case 4 is not provided with an electrical notch, and the electrical terminal E01 extends to the outside of the fixing case 4. Other features can be seen in example 3.

Example 6:

the present embodiment (not shown in the drawings) differs from embodiment 4 in that the electrical contact notch 4011 is not designed, the electrical contact terminal E01 of the electrode E is located inside the fixing shell 4, and the present embodiment further includes a power supply lead electrically connected to the electrical contact terminal E01, and the power supply lead extends out of the fixing shell 4. Other technical features can be seen in examples 1 and 2.

Example 7:

referring to fig. 12 to 14, the present embodiment describes an electric furnace to which the electric heating apparatus of any one of embodiments 1 to 3 is applied, including a cabinet 5, an electric heating apparatus H, and a circuit module (not shown); the cabinet 5 is provided with a cavity 500 having an upper opening 501, a mounting step 5011 is provided around the opening 501 of the cavity, the circuit module is electrically connected to the electrode E for controlling the operation of the electric heating device H, and the rim or flange connection 401 of the heating panel 1 of the electric heating device H is mounted on the mounting step 5011. Adopt the electric heating device of this patent, the whole thickness of electric stove is more frivolous, can satisfy the demand of frivolousization, cooperates 5011 to close the installation through heating panel 1 or turn-ups connecting portion 401 and assembly step, has simplified the installation procedure, and casing 5 can not design the bottom plate that can open to reduction in production cost.

Referring to fig. 1 to 18, and 12 to 14, in a preferred embodiment, a rim 101 of a heating panel 1 of an electric heating device H is mounted on a mounting step 5011, a plurality of hooks 403 are provided at the lower side of a flange connecting part 401, and when the rim 101 of the heating panel 1 is mounted on the mounting step 5011, the hooks 401 are pressed over the mounting step 5011 and caught at the lower side of the mounting step 5011 so as to fixedly attach the electric heating device H to a cabinet. The electric heating device H is connected with the assembly step 5011 through the clasp 403, and the assembly operation is simple, convenient and fast.

Referring to fig. 8, the clasp 403 includes a downwardly extending elastic connection 4031 connected to the cuff connection 401, and a wedge 4032 provided at an end of the elastic connection 4031, and the wedge 4032 includes a guide slope 40321, and a fastening portion 40322 provided between an upper side of the guide slope 40321 and the elastic connection 4031.

Referring to fig. 8 and 11, the assembly process of the electric heating device H and the cabinet 5 is explained:

the electric heating device H is mounted on the oven cavity 500 from above the housing 5 downwards, a certain force is applied to press the hook 403 downwards, when the guiding inclined plane 40321 is pressed against the lower side of the assembling step 5011, the elastic connecting part 4031 is elastically deformed, so that the wedge-shaped hook 4032 passes over the assembling step 5011, then the elastic connecting part 4031 is reset, so that the buckling part 40322 is buckled on the lower side of the assembling step 5011, the heating panel 1 is abutted against the assembling step 5011, the vertical freedom degree of the heating panel is limited, as the horizontal freedom degree of the heating panel 1 is limited by the side wall of the assembling step 5011 or the opening 501 of the housing 5, the assembling and fixing of the electric heating device H and the housing 5 are realized, and for the appearance and the waterproof, the gluing treatment can be performed between the heating panel 1 and the opening 501 of the housing 5.

Example 8:

referring to fig. 15 to 17, the present embodiment describes an electric furnace to which the electric heating apparatus of any one of embodiments 1 to 3 is applied, including a cabinet 5, an electric heating apparatus H, a circuit module (not shown), and a connection ring 7; the machine shell 5 is provided with a furnace cavity 500 with an upper side opening 501, the opening 501 surrounding the furnace cavity is provided with an assembling step 5011, the circuit module is electrically connected with the electrode E and used for controlling the work of the electric heating device H, the connecting ring 7 comprises a ring wall 701 inserted into the opening 501 of the furnace cavity and a clamping edge 702 annularly arranged on the outer side of the upper end of the ring wall 701, the ring wall 701 of the connecting ring 7 is inserted into the opening 501 of the furnace cavity, the clamping edge 702 is connected with the assembling step 5011 through bonding materials, the electric heating device H is assembled in the ring wall 701, and the installation positioning part of the electric heating device H is assembled on the upper side of the clamping edge 702.

Some machine cases, such as ceramic, cast iron cases, etc., are affected by temperature, impurities, etc. during manufacturing, and the shrinkage ratio can be changed, so that the accuracy of the size of the opening of the furnace chamber is not high, and the reject ratio is affected; these factors may cause a large error in assembling the electric heating apparatus H with the cabinet 5, which affects the assembling efficiency and the aesthetic appearance. Some stamped and formed housings also present precision issues. The connection ring piece 7 of this patent can be through the mould preparation, and the precision is high, and the above-mentioned problem of solution that can be fine through the linking of connecting ring piece 7 because as long as fix at the assembly step through the card along 702 and can guarantee electric heater unit H's assembly quality, can make the great casing of opening error of some furnace chambeies like this, also can satisfy the assembly requirement. In addition, the connecting ring piece 7 can play a role in heat insulation, and if the connecting ring piece 7 is made of materials with good heat insulation performance such as bakelite and the like, the heat insulation is better. Since the connection ring 7 can be pre-assembled on the housing 5, it is convenient for the manufacturer to stock the parts in bulk.

In a preferred embodiment, the edge of the heating panel 1 extends out of the flange connection portion 401, a plurality of hooks 403 are disposed on the lower side of the flange connection portion 401, the edge 101 of the heating panel 1 forms an installation positioning portion, and when the edge 101 of the heating panel 1 is installed on the clamping edge 702, the hooks 403 are buckled on the annular wall 701. The clasp 403 is used for assembling and disassembling the device with high maintenance efficiency, convenience and rapidness.

In a preferred embodiment, the annular wall 701 is provided with a fastening opening 7011 corresponding to the hook 403, and the hook 403 is fastened to the top wall of the fastening opening 7011. The buckle port 7011 is arranged to facilitate the buckling of the clasp 403; on the other hand, the fastening position is fixed by the fastening port 7011, and the position of the clasp 403 can be identified by the fixing position of the connecting ring 7, so that subsequent disassembly and maintenance are facilitated.

The connecting ring member 7 in the embodiment is also suitable for the case of adopting other heating elements, such as the electric ceramic furnace core disclosed in CN 109539338A; other existing electric ceramic stove movement which is connected with the base of the heating plate through an elastic supporting structure.

See example 1 for adhesive materials.

Referring to fig. 15 and 17, the assembly process of the electric heating device H and the cabinet 5 is explained:

assembling the connecting ring 7 on the machine shell 5, and fixing the clamping edge 702 of the connecting ring 7 and the assembling step 5011 through an adhesive material; then, the electric heating device H is mounted to the cavity 500 from above the housing 5 downward, a certain force is applied to press the hook 403 downward, so that the hook 403 is fastened to the top wall of the fastening port 7011, the heating panel 1 abuts against the clamping edge 702, the vertical degree of freedom is limited, the horizontal degree of freedom of the electric heating device H is limited by the annular wall 701, thus the electric heating device H and the housing 5 are assembled and fixed, and for the sake of beauty and water resistance, glue can be applied between the heating panel 1 and the opening 501 of the housing 5.

Example 9:

referring to fig. 12, 13, 18 to 23, this embodiment describes an electric furnace to which the electric heating apparatus of any one of embodiments 4 to 6 is applied, including a cabinet 5, an electric heating apparatus H, and a circuit module (not shown); the cabinet 5 is provided with a cavity 500 having an upper opening 501, a mounting step 5011 is provided around the opening 501 of the cavity, the circuit module is electrically connected to the electrode E for controlling the operation of the electric heating device H, and the rim 101 of the heating panel 1 of the electric heating device H is mounted on the mounting step 5011. Adopt the electric heater unit H of this patent, the whole thickness of electric stove is more frivolous, can satisfy the demand of frivolousization, cooperates 5011 through heating panel 1 and assembly step and closes the installation, has simplified the installation procedure, and casing 5 can not design the bottom plate that can open to reduction in production cost.

In a preferred embodiment, the rim 101 of the heating panel 1 of the electric heating device H is mounted on the mounting step 5011, and the underside of the flange connection 401 is provided with a plurality of clasps (not shown) which are pressed over the mounting step 5011 and snap against the underside of the mounting step 5011 when the rim 101 of the heating panel 1 is mounted on the mounting step 5011 to thereby fixedly attach the electric heating device H to the cabinet. The electric heating device H is connected with the assembly step 5011 through the clasp 403, and the assembly operation is simple, convenient and fast. The specific structure of the clasp can be embodied from examples 1, 7 or 8.

The process of assembling the electric heating apparatus H and the cabinet 5 of this embodiment can refer to embodiment 7.

Example 10:

referring to fig. 7, 17 to 25, this embodiment describes an electric furnace to which the electric heating apparatus of any one of embodiments 4 to 6 is applied, including a housing 5, an electric heating apparatus H, a circuit module (not shown), and a connection ring 7; the machine shell 5 is provided with a furnace cavity 500 with an upper side opening 501, the opening 501 surrounding the furnace cavity is provided with an assembly step 5011, the circuit module is electrically connected with the electrode E and used for controlling the work of the electric heating device H, the connecting ring 7 comprises a ring wall 701 inserted into the opening 501 of the furnace cavity and a clamping edge 702 annularly arranged on the outer side of the upper end of the ring wall 701, the ring wall 701 of the connecting ring 7 is inserted into the opening 501 of the furnace cavity, the clamping edge 702 is connected with the assembly step 5011 through bonding materials, the electric heating device H is assembled in the ring wall 701, and the edge of a heating panel 1 of the electric heating device H is assembled on the upper side of the clamping edge 702.

Some machine cases, such as ceramic, cast iron cases, etc., are affected by temperature, impurities, etc. during manufacturing, and the shrinkage ratio can be changed, so that the accuracy of the size of the opening of the furnace chamber is not high, and the reject ratio is affected; these factors may cause a large error in assembling the electric heating apparatus H with the cabinet 5, which affects the assembling efficiency and the aesthetic appearance. Some stamped and formed housings also present precision issues. The connection ring piece 7 of this patent can be through the mould preparation, and the precision is high, and the above-mentioned problem of solution that can be fine through the linking of connecting ring piece 7 because as long as fix the assembly quality that can guarantee electric heater unit H at assembly step 5011 through card edge 702, can make the great casing of opening error of some furnace chambeies like this, also can satisfy the assembly requirement. In addition, the connecting ring piece 7 can play a role in heat insulation, and if the connecting ring piece 7 is made of materials with good heat insulation performance such as bakelite and the like, the heat insulation is better. Since the connection ring 7 can be pre-assembled on the housing 5, it is convenient for the manufacturer to stock the parts in bulk. The connection of the connection ring 7 to the housing 5 can be made by the adhesive material of the rim 702 and the fitting step 5011, by an adhesive material commonly used in the art.

In a preferred embodiment, the fixed shell 4 is provided with hooks (not shown) on the outside of its upper part, which hooks are arranged on the circumferential wall 701 when the rim 101 of the heating panel 1 is mounted on the retaining rim 702. Make assembly and dismantlement maintenance efficiency high, convenient and fast through the clip. The specific structure of the clasp can be embodied from examples 1, 7 or 8

Referring to fig. 7, in a preferred embodiment, the annular wall 701 is provided with a fastening opening 7011 corresponding to the hook, and the hook is fastened to the top wall of the fastening opening 7011. The buckle port 7011 is arranged to facilitate the buckling of the clasp; on the other hand, the fastening position is fixed by the fastening port 7011, and the position of the clasp can be identified by the fixing position of the connecting ring 7, so that subsequent disassembly and maintenance are facilitated.

The connecting ring member 7 in the embodiment is also suitable for the case of adopting other heating elements, such as the electric ceramic furnace core disclosed in CN 109539338A; other existing electric ceramic stove movement which is connected with the base of the heating plate through an elastic supporting structure.

See example 1 for adhesive materials.

Referring to fig. 25, the assembly process of the electric heating apparatus H and the cabinet 5 is explained:

assembling the connecting ring 7 on the machine shell 5, and fixing the clamping edge 702 of the connecting ring 7 and the assembling step 5011 through an adhesive material; then, the electric heating device H is mounted to the cavity 500 from above the housing 5 downward, a certain force is applied to press the hook downward, so that the hook is fastened to the top wall of the fastening port 7011, the heating panel 1 abuts against the clamping edge 702, the vertical degree of freedom of the heating panel is limited, the horizontal degree of freedom of the electric heating device H is limited by the annular wall 701, and therefore the electric heating device H and the housing 5 are assembled and fixed.

Modifications and variations of the above-described embodiments are possible to those skilled in the art in light of the above teachings and teachings, and the invention is not limited to the specific embodiments disclosed and described, but rather, modifications and variations are possible within the scope of the invention as defined by the appended claims.

Claims (30)

1. An electric heating device, comprising:

a heating panel;

a heating film attached to a lower side of the heating panel;

the heat insulation component is provided with a heat insulation cavity with an opening at the upper side and used for covering the heating film;

an electrode electrically connected to the heating film;

the set casing is equipped with upside open-ended and is used for holding the shell chamber of thermal-insulated part, and the upper end of set casing is equipped with the turn-ups connecting portion of outside extension, and turn-ups connecting portion pass through bonding material and are connected with heating panel to fix thermal-insulated part at the heating film downside, heating panel's border or turn-ups connecting portion are installation location portion.

2. The electric heating device as claimed in claim 1, wherein the flange connecting portion is provided with an electrical contact notch, and the electrode is provided with an electrical contact extending to the electrical contact notch.

3. The electric heating device of claim 2, further comprising an insulating barrier for covering the power connection gap, wherein the insulating barrier includes an outer wall with a predetermined length adapted to the width of the power connection gap, and a wire channel is formed between the outer wall and the outer wall of the fixing housing.

4. The electrical heating device of claim 3, wherein the insulating barrier further comprises side walls disposed on opposite sides of the outer wall, and the two side walls have a length difference with the outer wall so that the upper portion of the outer wall can fit into the electrical contact gap, and a wire channel is formed between the two side walls and the outer wall of the fixing housing.

5. The electric heating device according to claim 4, wherein one side of the two side blocking walls, which is engaged with the outer wall of the fixing shell, is provided with an outwardly extending clamping edge, the outer wall of the fixing shell is provided with a clamping seat corresponding to the two clamping edges, a clamping groove for the clamping edge to be vertically inserted is formed between the clamping seat and the outer wall of the fixing shell, positioning protrusions are arranged on the outer sides of the upper ends of the two side blocking walls, fastening hooks are arranged on the two sides of the power connection notch of the flanging connecting portion corresponding to the positioning protrusions, and the insulating blocking member channel clamp is upwardly assembled to the positioning protrusions along the insertion clamping groove to be fastened into the fastening hooks so that the insulating blocking.

6. An electric heating device, comprising:

a heating panel;

a heating film attached to a lower side of the heating panel;

the heat insulation component is provided with a heat insulation cavity with an opening at the upper side and used for covering the heating film;

an electrode electrically connected to the heating film;

the set casing is equipped with upside open-ended and is used for holding the shell chamber of thermal-insulated part, and the upper end of set casing passes through bonding material and is connected with heating panel to fix thermal-insulated part at the heating film downside, the border of heating panel extends the set casing upper end outside and forms installation location portion.

7. The electric heating apparatus as claimed in claim 6, wherein the electrodes are provided with electric terminals, and electric gaps are provided outside the fixing case corresponding to the electric terminals, and the electric terminals extend to the electric gaps.

8. The electrical heating device of claim 7, wherein the electrical connection gap extends vertically through the upper and lower ends of the stationary housing.

9. An electrical heating apparatus in accordance with claim 2 or 7 wherein the electrical access notch extends inwardly through the upper end of the side wall of the mounting housing.

10. The electric heating device of claim 7, further comprising an insulating barrier for covering the power connection gap, wherein the insulating barrier includes an outer wall with a predetermined length adapted to the width of the power connection gap, and a wire channel is formed between the outer wall and the outer wall of the fixing housing.

11. The electric heating apparatus as claimed in claim 10, wherein the electrical contact notch is provided with a catching groove penetrating through a lower end of the fixing case, and the insulating barrier is inserted into the catching groove to be fitted at the electrical contact notch.

12. Electrical heating device as claimed in claim 6, characterized in that the electrodes are provided with electrical terminals which extend to the outside of the stationary housing.

13. The electric heating apparatus according to claim 1 or 6, wherein the width of the bonding portion between the upper end of the fixing case and the heating panel is 2.5mm or more.

14. The electric heating apparatus as claimed in claim 13, wherein the fixing case is provided at an upper end thereof with a groove, and the adhesive material is at least partially filled in the groove.

15. The electric heating apparatus as claimed in claim 1 or 6, wherein the electrodes are provided with electric terminals located inside the fixing case, and further comprising power supply leads electrically connected with the electric terminals, the power supply leads extending outside the fixing case.

16. An electric heating apparatus as claimed in any one of claims 2 to 5, 7 to 8, and 10 to 12, wherein the heat generating film is rectangular, the heat insulating chamber is correspondingly rectangular, the electrode further comprises electrode connecting portions which are connected to opposite sides of the heat generating film with lengths adapted to each other, and the electric terminals are connected to the electrode connecting portions.

17. The electric heating device according to claim 1 or 6, wherein the temperature measuring element is mounted on the bottom wall of the heat insulating cavity, and the temperature measuring element is spaced from the heat generating film by a preset distance.

18. The electric heating device according to any one of claims 2 to 5, 7 to 8, and 10 to 12, wherein the electric terminals are welded at the ends with electric supply wires.

19. The electric heating device according to any one of claims 3 to 5 and 10 to 11, wherein the electrodes are made of a solderable material, and power supply wires are soldered to the electric terminals and routed from the routing channels;

or the power supply wire is connected with an electric connection element, the electric connection element is tightly pressed by the insulating barrier piece and is electrically connected with the electric connection terminal, and the power supply wire is wired from the wiring channel.

20. The electric heating apparatus according to claim 1 or 6, wherein the heat generating film is a graphene heat generating film or a thick film heat generating film.

21. An electric heating apparatus according to any one of claims 1 to 8, characterized in that: the upper part of the fixed shell is provided with a plurality of clasps for installation.

22. An electric furnace, characterized in that it comprises:

a casing provided with a furnace chamber having an upper opening, and an assembly step surrounding the opening of the furnace chamber;

an electric heating device as claimed in any one of claims 1 to 5;

the edge or the flanging connecting part of the heating panel of the electric heating device is arranged on the assembling step.

23. The electric furnace according to claim 22, wherein the edge of the heating panel extends beyond the flange connection portion to form a mounting and positioning portion, the lower side of the flange connection portion is provided with a plurality of hooks, and when the edge of the heating panel is mounted on the mounting step, the hooks are pressed to pass over the mounting step and buckle the lower side of the mounting step, so that the electric heating device is fixedly connected with the casing.

24. The electric furnace according to claim 22, further comprising a connection ring, wherein the connection ring comprises a ring wall inserted into the opening of the furnace chamber and a clamping edge annularly arranged outside the upper end of the ring wall, the ring wall of the connection ring is inserted into the opening of the furnace chamber, the clamping edge is connected with the assembly step through a bonding material, the electric heating device is assembled in the ring wall, and the installation positioning part of the electric heating device is assembled on the upper side of the clamping edge.

25. The electric furnace according to claim 24, wherein the edge of the heating panel extends out of the flange connecting portion, a plurality of hooks are provided on the lower side of the flange connecting portion, the edge of the heating panel forms an installation positioning portion, and when the edge of the heating panel is installed on the clamping edge, the hooks are fastened on the ring wall.

26. An electric furnace, characterized in that it comprises:

a casing provided with a furnace chamber having an upper opening, and an assembly step surrounding the opening of the furnace chamber;

an electrical heating device as claimed in any one of claims 6 to 8;

the edge of the heating panel of the electric heating device is installed on the assembling step.

27. The electric fire according to claim 26 wherein the fixed housing is provided with a plurality of clips on an upper outer side thereof, the clips being pressed over the mounting step and being caught on a lower side thereof when the rim of the heating panel is mounted on the mounting step, thereby fixedly attaching the electric heating device to the cabinet.

28. The electric furnace according to claim 26, further comprising a connection ring, wherein the connection ring comprises a ring wall inserted into the opening of the furnace chamber and a clamping edge annularly arranged outside the upper end of the ring wall, the ring wall of the connection ring is inserted into the opening of the furnace chamber, the clamping edge is connected with the assembly step through an adhesive material, the electric heating device is assembled in the ring wall, and the installation positioning part of the electric heating device is assembled on the upper side of the clamping edge.

29. The electric fire according to claim 28 wherein the outer side of the upper portion of the retaining shell is provided with a plurality of clips which snap onto the annular wall when the edge of the heating panel is mounted on the retaining rim.

30. The electric fire according to claim 25 or 29 wherein the surround is provided with a snap interface for the hook, the hook snap on the top wall of the snap interface.

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