Electric heating device and electric stove

Abstract

The electric heating device of the present invention includes a heating panel, a heating element, a heat insulation component, a fixing shell, a temperature measuring element, and a socket. The heating element is located on the lower side of the heating panel and has a power receiving part. The heat insulation component has a heat insulation cavity with an upper opening for covering the heating element. The fixing shell has a shell cavity with an upper opening for accommodating the heat insulation component, and the upper end of the fixing shell is connected to the heating panel by an adhesive material. The temperature measuring element is installed at the bottom of the heat insulation component. The socket is fixed to the side of the fixing shell and electrically connected to the power receiving part and the temperature measuring element respectively through a power supply wire and a detection wire. The power supply wire is arranged in a power supply groove, and the detection wire is arranged in a detection groove. The interface end of the socket faces the side of the fixing shell. By providing a socket on the fixing shell, external wiring can be quickly connected to the socket of the electric heating device through a plug during assembly. This assembly method is simple, quick, reliable, and interchangeable, achieving modular packaging and good overall product integrity.

Description

Technical Field

[0001] This invention relates to the field of electric furnace technology, and more specifically to electric heating devices and electric furnaces. Background Technology

[0002] Currently, electric ceramic cooktops on the market generally consist of a casing, a core, and a control panel. The core includes a heating element and a base. The base comprises a top cover, side shells, bottom cover, cooling fan, and circuit board. The control panel is located above the heating element. During operation, the heat generated by the heating element within the heating element heats the control panel, which in turn heats the items placed on it. Electric ceramic cooktops are versatile, offering functions such as boiling water, frying, grilling, hot pot, stir-frying, heating milk, simmering soup, and slow cooking, making them popular among consumers.

[0003] Traditional mechanisms do not consider the integration of the heating element and the panel, resulting in a complex structure for both the mechanism and the housing. The housing requires a bottom plate that can be opened to reveal the cavity, and the panel needs to be fixedly mounted on a step at the top of the cavity. The mechanism is then installed upwards from the cavity, with the upper part of the heating element pressed against the lower side of the panel by an elastic support between the mechanism base and the heating element. This structural design is complex and difficult to install. Furthermore, the housing needs to be designed with openings at the top and bottom, and a connecting structure must be designed between the bottom plate and the lower part of the housing, further complicating the housing structure. For example, the housing of an electric ceramic stove made of ceramic material, with an opening at the bottom, has high manufacturing costs and complex processes.

[0004] With the improvement of the process, the mechanism and ceramic cooker disclosed in Chinese patent document CN109539338A, by setting a connecting part at the upper end of the heating plate housing, the panel is connected to the connecting part by adhesive material, so that the panel can be directly fixed to the heating plate. Compared with the existing method of using elastic support to connect the heating plate and the panel, this simplifies the structure and size of the mechanism and makes the overall mechanism more compact. Since the panel is directly fixed to the heating plate, when assembling it into the ceramic cooker, it is not necessary to fix the panel to the mounting step of the ceramic cooker housing first. Therefore, it is possible to use the method of installation from the top of the ceramic cooker housing downwards, and fix the mechanism by the cooperation of the panel or connecting part with the mounting step. This not only simplifies the installation process, but also eliminates the need to design an openable bottom plate at the bottom of the ceramic cooker housing, thereby reducing production costs.

[0005] The existing mechanism typically connects a power supply wire and a detection wire to the power supply part of the heating element and the temperature measuring element respectively as a terminal. After the mechanism is assembled into the housing, the external wiring and the terminal need to be connected together by wire clamps or soldering. Moreover, the wiring needs to be properly connected to fix the mechanism, which is troublesome to assemble. Different housing specifications have different wire lengths, which means that different terminals need to be customized for different housing specifications, resulting in poor interchangeability. Summary of the Invention

[0006] One objective of this invention is to overcome the shortcomings of the prior art and provide an electric heating device that is quick to connect and assemble, and has good interchangeability. The technical solution adopted by this invention is as follows:

[0007] An electric heating device includes a heating panel, a heating element, a heat insulation component, a fixing shell, a temperature measuring element, and a socket. The heating element is located on the lower side of the heating panel and has a power receiving part. The heat insulation component has a heat insulation cavity with an upper opening for covering the heating element. The fixing shell has a shell cavity with an upper opening for accommodating the heat insulation component, and the upper end of the fixing shell is connected to the heating panel by an adhesive material. The temperature measuring element is installed at the bottom of the heat insulation component. The socket is fixed to the side of the fixing shell and is electrically connected to the power receiving part and the temperature measuring element by a power supply wire and a detection wire, respectively. The outside of the fixing shell is provided with a power supply wire groove connecting the socket and the power receiving part, and a detection wire groove connecting the temperature measuring element and the socket. The power supply wire is arranged in the power supply wire groove, and the detection wire is arranged in the detection wire groove. The interface end of the socket faces the side of the fixing shell.

[0008] This patented design incorporates a socket on the fixed housing, allowing for quick and easy connection of external wiring to the electric heating device's socket via a plug during assembly. This assembly method is simple, quick, and reliable, and offers ample design space for external wiring length, resulting in excellent interchangeability of the electric heating device. The inclusion of power supply and detection cable trays, with the power and detection wires housed within their respective trays, optimizes wiring placement and creates a neater product appearance. This modular packaging enhances the overall integrity of the product. Furthermore, the socket's interface faces the side of the fixed housing, facilitating connection to external wiring without compromising thickness, contributing to a slim and lightweight product.

[0009] Preferably, a socket mounting groove is provided on the side of the bottom wall of the fixed housing. The socket mounting groove penetrates the side wall of the fixed housing. The power supply wire groove and the detection wire groove are connected to the socket mounting groove. The socket is installed in the socket mounting groove, and the interface end of the socket is installed at the side opening of the socket mounting groove. The socket mounting groove facilitates the installation of the socket, allowing the socket to be integrated into the fixed housing for a more compact assembly. Installing the interface end of the socket in the side opening of the socket mounting groove avoids the increase in thickness caused by the power plug when the electric heating device is installed on the electric furnace.

[0010] Preferably, the upper end of the fixed shell has a connection notch corresponding to the connection part, the connection part extends to the connection notch, and the power supply cable trough extends from the side wall of the fixed shell to the connection notch. The connection notch facilitates the connection of the connection part and the power supply wire, and the alignment of the connection notch with the connection part can be used for the assembly and positioning of the heat insulation cavity and the heating element of the heat insulation component.

[0011] Preferably, the power supply wire and the detection wire are fixed in the wire groove by applying glue. Using glue to fix the wires is easy to obtain, has good encapsulation, is firmly fixed, and is convenient to operate.

[0012] Preferably, the socket has socket connecting parts on both sides and connecting grooves on both sides of the socket assembly groove. The socket connecting parts are fixed in the connecting grooves by screws, thereby fixing the socket in the socket assembly groove.

[0013] Preferably, the contact parts of the heating element are arranged on opposite sides, and there are two power supply cable trays, which together form a V-shape. The detection cable tray is located between the two power supply cable trays. This cable tray layout is easy to manufacture and provides better structural integrity of the mounting housing.

[0014] Preferably, the heating element is a heating film, which is attached to the underside of the heating panel. Using a heating film as the heating element results in a simpler overall product structure and a thinner overall thickness, meeting the requirements for a slimmer and lighter design. Since the heating film is pre-attached to the heating panel, assembly is very quick. The installation process is simplified by fitting the heating panel to the housing, eliminating the need for an openable base plate and thus reducing production costs.

[0015] The power supply wires and the electrical connection parts are connected by welding.

[0016] Preferably, the device further includes a cover with an upper opening for accommodating a cavity containing a fixed housing. A socket is provided on the side of the cover corresponding to the interface end of the socket. The cover is mounted on the outside of the fixed housing and is rotatably connected to the fixed housing around its center via a rotating connection structure. The socket can be rotated to align with or offset from the interface end of the socket. The cover covers the outside of the fixed housing, and the rotating connection structure allows the socket to be opened and closed, improving the product's encapsulation and aesthetics.

[0017] Specifically, the rotating connection structure includes an arc-shaped guide groove located at the center of the bottom wall of the fixed shell, and a guide block located on the upper side of the bottom wall of the cover that mates with the arc-shaped guide groove. The guide block is assembled within the arc-shaped guide groove, and moves along the arc-shaped guide groove when the cover rotates. This structure ensures the smoothness and reliability of the rotation, and also avoids the location where the temperature sensing element is installed in the middle of the bottom wall of the fixed shell.

[0018] Preferably, the guide block has a raised edge on one side of its upper end. After the guide block is inserted into the arc-shaped guide groove, the raised edge is engaged with the limiting surface of the arc-shaped guide groove. The raised edge connects the cover and the fixing shell, resulting in a simple structure and convenient installation.

[0019] Preferably, the upper part of the guide block has a clearance portion on the side opposite the convex edge. The clearance portion allows the upper part of the guide block to elastically deform when inserted into the arc guide groove, so that the convex edge can be inserted into the arc guide groove and locked onto the limiting surface. The clearance portion is set on the upper part of the guide block to ensure the guiding effect of the upper part of the guide block and the arc guide groove.

[0020] Preferably, the fixing shell and / or cover are made of bakelite. Bakelite has advantages such as high mechanical strength, good insulation, heat resistance, and corrosion resistance.

[0021] The present invention also provides an electric furnace using the above-mentioned electric heating device, including a housing, an electric heating device, and an electrical wire assembly; the housing has a furnace cavity with an upper opening, an assembly step is provided around the opening of the furnace cavity, and a wire hole is provided on the side of the housing; the mounting and positioning part of the electric heating device is mounted on the upper side of the assembly step; the electrical wire assembly includes a plug and an electrically connected power cord and a detection cord, and the plug is electrically connected to a socket through the wire hole.

[0022] Because a socket is provided on the fixed housing of the electric heating device, the electrical wiring assembly can be quickly connected to the socket of the electric heating device through a plug when assembled into the housing. The external wiring length design has a large space and good interchangeability.

[0023] The specific installation includes the following three scenarios: Scenario 1: The edge of the heating panel serves as the mounting positioning part, which is connected to the assembly step via adhesive material. Scenario 2: The upper end of the fixed shell has an outwardly extending flanged connecting part, which serves as the mounting positioning part and is connected to the assembly step via adhesive material. Scenario 3: The upper end of the fixed shell has an outwardly extending flanged connecting part, and the lower side of the flanged connecting part has several hooks for installation. The edge of the heating panel or the flanged connecting part serves as the mounting positioning part, and the hooks are engaged with the lower side of the assembly step.

[0024] Some casings, such as ceramic or cast iron casings, experience variations in shrinkage due to factors like temperature and impurities during manufacturing. This leads to inaccurate furnace cavity opening dimensions and affects the defect rate. These factors also result in significant assembly errors between the electric heating device and the casing, impacting assembly efficiency and aesthetics. Some stamped casings also exhibit precision issues.

[0025] Therefore, this patent provides another electric furnace solution: including a housing, an electric heating device, a connecting ring, and an electrical wire assembly; the housing has a furnace cavity with an upper opening, and an assembly step is provided around the opening of the furnace cavity, and a wire hole is provided on the side of the housing; the connecting ring includes an annular wall that inserts into the opening of the furnace cavity, and a retaining edge that is arranged around the upper outer side of the annular wall, the annular wall of the connecting ring is inserted into the opening of the furnace cavity, the retaining edge is fixed on the assembly step, the electric heating device is assembled in the annular wall, and the mounting and positioning part of the electric heating device is installed on the upper side of the retaining edge; the electrical wire assembly includes a plug and an electrically connected power cord and detection cord, and the plug is electrically connected to the socket through the wire hole.

[0026] Because the connecting ring can be manufactured with high precision using molds, the aforementioned problems can be effectively solved through its connection. Since it is fixed to the assembly step by a retaining edge, the assembly quality of the electric heating device can be guaranteed. This allows even machine casings with large opening errors in the furnace cavity to meet assembly requirements. Furthermore, the connecting ring also provides thermal insulation; if it is made of a material with good thermal insulation properties, such as bakelite, the insulation is even better.

[0027] The specific installation includes the following three scenarios: Scenario 1: The edge of the heating panel serves as the mounting and positioning part, which is connected to the retaining edge via adhesive material. Scenario 2: The upper end of the fixing shell has an outwardly extending flanged connecting part, which serves as the mounting and positioning part and is connected to the retaining edge via adhesive material. Scenario 3: The upper end of the fixing shell has an outwardly extending flanged connecting part, and the lower side of the flanged connecting part has several hooks for installation. The edge of the heating panel or the flanged connecting part serves as the mounting and positioning part, and the hooks are fastened to the ring wall. Attached Figure Description

[0028] Figure 1 This is a 3D diagram of an electric heating device.

[0029] Figure 2 This is a cross-sectional view of an electric heating device.

[0030] Figure 3 This is a cross-sectional view of the electric heating device from another angle.

[0031] Figure 4 This is a bottom-view perspective of the electric heating device.

[0032] Figure 5 Exploded view of an electric heating device

[0033] Figure 6 Exploded view of an electric heating device from below

[0034] Figure 7 This is a bottom view of the heating panel and heating element.

[0035] Figure 8 It is a 3D view of the fixed shell.

[0036] Figure 9 This is a bottom-view 3D diagram of a fixed shell.

[0037] Figure 10 A 3D diagram of the socket, power supply wire, and test wire.

[0038] Figure 11 This is a 3D view of an electric heating device (with a cover, in the open position).

[0039] Figure 12 This is a 3D view of an electric heating device (with a cover, in the off state).

[0040] Figure 13 This is a cross-sectional view of an electric heating device (with a cover, in the open position).

[0041] Figure 14 This is a bottom-view perspective of the electric heating device (with a cover).

[0042] Figure 15 This is a sectional view of the cover.

[0043] Figure 16 It is a 3D diagram of the cover.

[0044] Figure 17 This is a schematic diagram of an electric heating device with a hook.

[0045] Figure 18 This is an exploded view of the electric furnace in Example 2.

[0046] Figure 19 This is an exploded view of the electric furnace in Example 3.

[0047] Figure 20 This is a 3D view of the connecting ring. Detailed Implementation

[0048] The technical solution of the present invention will be described below with reference to the accompanying drawings and specific embodiments.

[0049] Example 1:

[0050] See Figures 1 to 4 The electric heating device H includes a heating panel 1, a heating element 2, a heat insulation component 3, a fixing shell 4, and a socket S. The heating element 2 is used to heat the heating panel 1 and has a power connection part 201. The heat insulation component 3 has a heat insulation cavity 300 with an upper opening for covering the heating element 2. The fixing shell 4 has a shell cavity 400 with an upper opening for accommodating the heat insulation component 3. The upper end of the fixing shell 4 is connected to the heating panel 1 by an adhesive material, thereby fixing the heat insulation component 3 to the lower side of the heating element 2. The socket S is electrically connected to the power connection part 201 through a power supply wire L1. The adhesive material is usually a well-known adhesive material commonly used in electronic components, such as electronic silicone.

[0051] To detect the temperature of the heating element 2, a temperature sensing element T is further included. The temperature sensing element T is mounted on the heat insulation component 3 and typically extends into the heat insulation cavity 300. It is used to detect the operating temperature of the heating element 2. The temperature sensing element T is electrically connected to the socket S via a detection wire L2. Generally, the temperature sensing element T does not need to be in direct contact with the heating element 2; instead, it determines the temperature by detecting the temperature around the heating element 2. This protects the lifespan of the temperature sensing element T.

[0052] The power supply wire L1 and the detection wire L2 are connected to a single socket S. During assembly, the external wiring can be quickly connected to the electric heating device H via a plug. The design allows for a large length of external wiring, quick connection and assembly, and good interchangeability.

[0053] In one preferred embodiment, the socket S is fixed to the fixed housing 4, which prevents the power supply wire L1 and the detection wire L2 from being moved and pulled by the socket S, while also allowing for the integration and optimization of product components.

[0054] See Figures 1 to 4 , Figure 5 and Figure 10 In a preferred embodiment, the socket S is fixed to the side of the housing 4, with the interface end S' of the socket S facing the side of the housing 4. Having the interface end of the socket S facing the side of the housing 4 facilitates connection to external wiring and does not occupy thickness space, resulting in a thin and lightweight product.

[0055] See Figure 7 In a preferred embodiment, the heating element 2 is a heating film, which is attached to the underside of the heating panel 1. Using a heating film as the heating element results in a simpler overall structure and a thinner overall thickness, meeting the requirements for a slimmer and lighter design. Since the heating film is pre-attached to the heating panel, assembly is very quick. The installation process is simplified by fitting the heating panel 1 into the housing, eliminating the need for an openable base plate and thus reducing production costs. The heating film 2 is commonly made of graphene or thick-film heating film, and can be any existing heating circuit or other known heating materials. The process of attaching the heating film 2 to the heating panel 1 is prior art and will not be described in detail here. The heating panel 1 is typically made of microcrystalline glass or quartz glass, but can also be any other high-temperature resistant and thermally conductive panel in the art.

[0056] See Figure 2 and Figure 3 In the design where the heating element 2 uses a heating film, the temperature sensing element T is installed at the bottom of the heat insulation component 3, separated from the heating element 2 by a predetermined distance. This allows the temperature detected by the temperature sensing element T to be closer to the overall temperature of the thick-film heating element 2 under the heat transfer effect of the gas within the heat insulation cavity 300, resulting in high detection accuracy. The power connection of the temperature sensing element T is integrated into the socket S, allowing for quick and easy assembly of the heating element 2 and the temperature sensing element T simultaneously via the socket S. In other designs, to facilitate the installation of the temperature sensing element T, a housing is provided at the upper end of the probe of the temperature sensing element T. During installation, the upper end of the housing rests against the lower side of the heating panel 1, ensuring a more precise distance between the probe of the temperature sensing element T and the heating panel 1.

[0057] Specifically, the temperature sensing element T is preferably installed in the middle of the bottom wall of the insulation cavity 300. This design allows for better placement of the temperature sensing element T.

[0058] See Figures 1 to 6In a preferred embodiment, the outer side of the fixed housing 4 is provided with a power supply cable groove S1 that connects to the socket S and the power receiving part 201, and a detection cable groove S2 that connects the temperature measuring element T and the socket S. The power supply wire L1 is arranged in the power supply cable groove S1, and the detection wire L2 is arranged in the detection cable groove S2. Since the power supply cable groove S1 and the detection cable groove S2 are provided, the power supply wire L1 and the detection wire L2 are housed in the corresponding cable grooves (S1, S2), making the wiring position more reasonable. Arranging them in the cable grooves (S1, S2) makes the product neater, realizes modular packaging, and the overall integrity of the product is good.

[0059] In a preferred embodiment, the power supply wire L1 and the detection wire L2 are fixed within the wire grooves (S1, S2) by applying adhesive. Using adhesive to fix the wires (L1, L2) provides readily available materials, good encapsulation, secure fixation, and ease of operation. The adhesive material can be electronic silicone. In other embodiments, the power supply wire L1 and the detection wire L2 can also be encapsulated using adhesive tape, wire clamps, or a combination thereof. Using adhesive tape is convenient, and wire clamps provide a more aesthetically pleasing enclosure.

[0060] See Figures 1 to 9 In a preferred embodiment, the upper end of the fixed shell 4 is provided with a power connection notch 4011 corresponding to the power connection part 201, the power connection part 201 extends to the power connection notch 4011, and the power supply trough S1 extends to the power connection notch 4011. The power connection notch 4011 facilitates the connection between the power connection part 201 and the power supply wire L, and the thickness of the power connection notch 4011 also protects the power connection part 201. Another function of the power connection notch 4011 is that the alignment of the power connection notch 4011 with the power connection part 201 can be used for the assembly and positioning of the heat insulation cavity 300 of the heat insulation component 3 and the heating element 2.

[0061] See Figure 2 , Figures 4 to 6 In a preferred embodiment, a socket assembly groove S0 is provided on the bottom side of the fixed housing 4. The socket assembly groove S0 penetrates the side wall of the fixed housing 4. The power supply groove S1 and the detection groove S2 are connected to the socket assembly groove S0. The socket S is installed in the socket assembly groove S0, and the interface end of the socket S is installed at the side opening of the socket assembly groove S0. The socket assembly groove S0 facilitates the installation of the socket S, allowing the socket S to be integrated into the fixed housing 4 for a more compact assembly. Installing the interface end of the socket S in the side opening of the socket assembly groove S0 avoids the increase in thickness caused by the power plug when the electric heating device H is assembled on the electric furnace.

[0062] See Figure 8 The inner wall of the fixed shell 4 has a protrusion corresponding to the socket assembly groove S0, so that the thickness of the fixed shell 4 will not change too much.

[0063] See Figure 4 and Figure 10In a preferred embodiment, the socket S is provided with socket connecting parts S3 on both sides, and the socket assembly groove S0 is provided with connecting grooves S4 on both sides. The socket connecting parts S3 are fixed in the connecting grooves S4 by screws, thereby fixing the socket S in the socket assembly groove S0.

[0064] See Figure 4 , Figure 9 and Figure 10 In a preferred embodiment, the energizing portion 201 of the heating element 2 is arranged on opposite sides, and two power supply troughs S1 are provided, which together form a V-shape. The detection trough S2 is located between the two power supply troughs S1. The troughs (S1, S2) are arranged in the above layout, which is easy to manufacture and improves the structural integrity of the fixing shell 4.

[0065] See Figure 7 In one preferred embodiment, the heating element 2 is a rectangular heating film, and electrodes 200 are provided on both sides of the heating element 2. The two electrodes 200 are respectively connected to the receiving part 201. The rectangular heating film has the same resistivity between opposite sides, and the heating temperature is uniform.

[0066] See Figures 2 to 4 In a preferred embodiment, the power supply wire L1 and the energizing part 201 are connected by welding. Of course, in other embodiments, conventionally used energizing methods such as abutment or socket connection can also be used.

[0067] See Figures 2 to 4 In a preferred embodiment, the width of the bonding portion between the upper end of the fixing shell 4 and the heating panel 1 is 2.5mm or more, preferably 2.5mm-10mm. Within this size range, both the stability of the connection and the economy can be balanced.

[0068] See Figures 2 to 4 In a preferred embodiment, the upper end of the fixed shell 4 is provided with an outwardly extending flanged connecting portion 401. The flanged connecting portion 401 is connected to the heating panel 1 by an adhesive material. The edge of the heating panel 1 or the flanged connecting portion 401 serves as a mounting and positioning portion 101. Providing the flanged connecting portion 401 can ensure the stability of the connection while reducing the thickness of the sidewall.

[0069] See Figure 17 In a preferred embodiment, the lower side of the flanged connecting portion 401 is provided with a plurality of spring clips 403 for installation. The spring clip scheme shown in the figure is a hook. In addition to hooks, the spring clips 403 can also be detachable fastening structures with a certain degree of elasticity commonly used in the art or in some electrical assembly. The spring clips 403 make assembly, disassembly and maintenance efficient, convenient and quick.

[0070] See Figure 5 and Figure 8In a preferred embodiment, the upper end of the fixing shell 4 is provided with a groove 4010, and the adhesive material is at least partially filled in the groove 4010. This arrangement can improve the bonding effect between the adhesive material and the heating panel 1 and the fixing shell 4, and also facilitates the adhesion of the adhesive material to the corresponding connecting part at the upper end of the fixing shell 4.

[0071] See Figure 1 , Figures 11 to 14 In a preferred embodiment, the device further includes a cover K, which has an upper opening for accommodating a cavity K0 of the fixed housing 4. The side of the cover K has a socket K01 corresponding to the interface end of the socket S. The cover K is mounted on the outside of the fixed housing 4 and is rotatably connected to the fixed housing 4 around its center via a rotating connection structure C. The cover K can be rotated to align or offset the socket K01 with the interface end of the socket S. The cover K covers the outside of the fixed housing 4, and the rotating connection structure C allows the socket S to be opened and closed, thus concealing the power supply cable tray S1, the detection cable tray S2, and the socket S, improving the product's encapsulation and aesthetics.

[0072] See Figures 13 to 16 One embodiment of the rotary connection structure C includes an arc-shaped guide groove C01 located at the center of the bottom wall of the fixed shell 4, and a guide block C02 located on the upper side of the bottom wall of the cover K and cooperating with the arc-shaped guide groove C01. The guide block C02 is assembled within the arc-shaped guide groove C01, and moves along the arc-shaped guide groove C01 when the cover K rotates. This structure ensures the smoothness and reliability of the rotation, and also avoids the location where the temperature sensing element T is installed in the middle of the bottom wall of the fixed shell 4.

[0073] See Figures 13 to 16 In a preferred embodiment, the guide block C02 has a raised edge C021 on one side of its upper end. After the guide block C02 is inserted into the arc-shaped guide groove C01, the raised edge C021 fastens onto the limiting surface of the arc-shaped guide groove C01. The raised edge C021 connects the cover K and the fixing shell 4, resulting in a simple structure and convenient installation. See also Figure 13 As the bottom wall of the fixed shell 4, the arc-shaped guide groove C01 penetrates through it, and one side of the upper end of the arc-shaped guide groove C01 is a limiting surface. Correspondingly, the heat insulation body is provided with a relief groove 302 at the upper end of the relief guide block C02.

[0074] See Figures 13 to 16 In a preferred embodiment, the upper part of the guide block C02 has a clearance portion C020 on the side opposite the convex edge C021. The clearance portion C020 allows the upper part of the guide block C02 to elastically deform when inserted into the arc guide groove C01, so that the convex edge C021 can be inserted into the arc guide groove C01 and locked onto the limiting surface. The clearance portion C020 is provided on the upper part of the guide block C02 to ensure the guiding effect of the upper part of the guide block C02 and the arc guide groove C01.

[0075] See Figure 1 and Figure 11 In a preferred embodiment, the fixing shell 4 and / or the cover K are made of bakelite. Bakelite has advantages such as high mechanical strength, good insulation, heat resistance, and corrosion resistance.

[0076] Example 2:

[0077] See Figures 1 to 14 , Figure 18 This embodiment describes an electric furnace using the solution of Embodiment 1, including a housing 55, an electric heating device H, and an electrical wiring assembly (not shown); the housing 55 has a furnace cavity 500 with an upper opening 501, and an assembly step 5011 is provided around the opening 501 of the furnace cavity 500. A wire hole 502 is provided on the side of the housing 55; the mounting and positioning part of the electric heating device H is installed on the upper side of the assembly step 5011; the electrical wiring assembly includes a plug and an electrically connected power cord and a detection wire. The plug is electrically connected to the socket S through the wire hole 502, and the power cord and the detection wire are generally encapsulated in a cable.

[0078] Because a socket S is provided on the fixed shell 4 of the electric heating device H, the electrical wiring assembly can be quickly connected to the socket S of the electric heating device H through a plug when assembled into the housing 5. The design space for the external wiring length is large and the interchangeability is good.

[0079] The specific installation of the electric heating device H includes the following three options:

[0080] Option 1: The upper end of the fixing shell 4 extends from the edge of the heating panel 11 as the mounting and positioning part, which is connected to the assembly step 5011 by adhesive material.

[0081] Option 2: The upper end of the fixed shell 4 is provided with an outwardly extending flanged connecting part 401. The flanged connecting part 401 is a mounting and positioning part, which is connected to the assembly step 5011 by adhesive material.

[0082] Option 3, see Figure 17 The upper end of the fixed shell 4 is provided with an outwardly extending flanged connecting part 401. Several spring clips 403 for installation are provided on the lower side of the flanged connecting part 401. The edge of the heating panel 1 serves as the installation positioning part, and the spring clips 403 are fastened to the lower side of the assembly step 5011. The spring clip 403 shown in the figure is a hook. Besides hooks, the spring clip 403 can also be a detachable, flexible fastening structure commonly used in this field or in the assembly of some electrical appliances. The spring clips 403 make assembly, disassembly, and maintenance efficient, convenient, and quick.

[0083] In other embodiments, the edge of the heating panel 1 may not extend to the flanged connection portion 401, which serves as the mounting and positioning portion.

[0084] Because a socket S is provided on the fixed shell 4 of the electric heating device H, the external wiring can be quickly connected to the electric heating device H through a plug when assembled into the housing 5. The design space for the length of the external wiring is large and the interchangeability is good. The installation process is simplified by the installation positioning part of the heating panel 1 cooperating with the housing 5. The housing 5 does not need to be designed with an openable bottom plate, thereby reducing production costs.

[0085] Example 3:

[0086] See Figures 1 to 14 , Figure 19 This embodiment describes another electric furnace applying the solution of Embodiment 1, including a housing 5, an electric heating device H, a connecting ring 7, and an electrical wire assembly (not shown); the housing 5 has a furnace cavity 500 with an upper opening 501, and an assembly step 5011 is provided around the opening 501 of the furnace cavity 500. A wire hole 502 is provided on the side of the housing 5; the connecting ring 7 includes an annular wall 701 inserted into the opening 501 of the furnace cavity 500, and a retaining edge 702 surrounding the upper outer side of the annular wall 701. The annular wall 701 of the connecting ring 7 is inserted into the opening 501 of the furnace cavity 500, and the retaining edge 702 is fixed on the assembly step 5011. The electric heating device H is assembled in the annular wall 701, and the mounting and positioning part of the electric heating device H is installed on the upper side of the retaining edge 702; the electrical wire assembly includes a plug and an electrically connected power cord and a detection wire. The plug is electrically connected to the socket S through the wire hole 502, and the power cord and the detection wire are generally encapsulated in a cable.

[0087] Some housings 5, such as ceramic or cast iron housings, may experience changes in shrinkage ratio due to factors such as temperature and impurities during manufacturing. This can lead to lower dimensional accuracy of the opening 501 in the furnace cavity 500, affecting the defect rate. These factors can also cause significant assembly errors between the electric heating device H and the housing 5, impacting assembly efficiency and aesthetics. Some stamped housings 5 ​​also exhibit precision issues.

[0088] Since the connecting ring 7 can be manufactured with high precision using molds, the aforementioned problems can be effectively solved through the connection of the connecting ring 7. This is because the assembly quality of the electric heating device H can be guaranteed simply by fixing it to the assembly step 5011 via the retaining edge 702. This allows even machine housings 5 ​​with larger errors in the opening 501 of the furnace cavity 500 to meet assembly requirements. Furthermore, the connecting ring 7 can also provide heat insulation; if it is made of a material with good heat insulation properties, such as bakelite, the insulation will be even better.

[0089] The specific installation of the electric heating device H includes the following three options:

[0090] Option 1: The upper end of the fixing shell 4 extends from the edge of the heating panel 1 as the mounting and positioning part, which is connected to the clip edge 702 by adhesive material.

[0091] Option 2: The upper end of the fixed shell 4 is provided with an outwardly extending flange connection part 401. The flange connection part 401 is a mounting and positioning part, which is connected to the clip edge 702 by adhesive material.

[0092] See Figure 17 In scheme 3, the upper end of the fixed shell 4 is provided with an outwardly extending flanged connecting part 401. Several spring clips 403 for installation are provided on the lower side of the flanged connecting part 401. The edge of the heating panel 1 serves as the installation positioning part, and the spring clips 403 are fastened to the annular wall 701. The spring clip 403 shown in the figure is a hook. Besides hooks, the spring clip 403 can also be a detachable, flexible fastening structure commonly used in this field or in some electrical appliance assembly. The spring clip 403 makes assembly, disassembly, and maintenance efficient, convenient, and quick.

[0093] In other embodiments, the edge of the heating panel 1 may not extend to the flanged connection portion 401, which serves as the mounting and positioning portion.

[0094] To facilitate the installation of the spring clip 403, a clip position 7011 is provided on the ring wall 701.

[0095] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. The present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention.

Claims

1. An electric heating device, characterized in that, include: Heating panel; The heating element is attached to the underside of the heating panel and has a power contact part; The heat insulation component has a heat insulation cavity with an upper opening for covering the heating element; The fixed shell has a cavity with an upper opening for accommodating the heat insulation component. The upper end of the fixed shell is connected to the heating panel by an adhesive material. The upper end of the fixed shell has an electrical connection notch corresponding to the electrical connection part, and the electrical connection part extends to the electrical connection notch. The temperature sensing element is installed at the bottom of the heat insulation component; The socket is installed in the socket assembly slot on the side of the bottom wall of the fixed housing. It is electrically connected to the receiving part and the temperature measuring element through the power supply wire and the detection wire, respectively. The outside of the fixed housing is provided with a power supply wire groove connecting the socket assembly slot and the receiving part, and a detection wire groove connecting the temperature measuring element and the socket assembly slot. The power supply wire is arranged in the power supply wire groove, and the detection wire is arranged in the detection wire groove. The socket assembly slot penetrates the side wall of the fixed housing, and the interface end of the socket is installed at the side opening of the socket assembly slot. The cover has an upper opening for accommodating the cavity of the fixed shell. The side of the cover has a socket corresponding to the interface end of the socket. The cover is installed on the outside of the fixed shell and can be rotatably connected to the fixed shell around the center of the fixed shell through a rotating connection structure. The socket can be aligned with or offset from the interface end of the socket by rotating the cover.

2. The electric heating device according to claim 1, characterized in that, The power supply wires and detection wires are fixed inside the wire groove by applying glue.

3. The electric heating device according to claim 1, characterized in that, The socket has socket connection parts on both sides, and the socket assembly slot has connection slots on both sides. The socket connection parts are fixed in the connection slots by screws, thereby fixing the socket in the socket assembly slot.

4. The electric heating device according to any one of claims 1 to 3, characterized in that, The heating element's contact portion is arranged on opposite sides, and there are two power supply cable trays, which together form a V-shape. The detection cable tray is located between the two power supply cable trays.

5. The electric heating device according to claim 1, characterized in that, The power supply wires and the electrical connection parts are connected by welding.

6. The electric heating device according to claim 1, characterized in that, The rotating connection structure includes an arc-shaped guide groove located at the center of the bottom wall of the fixed shell, and a guide block located on the upper side of the bottom wall of the cover that cooperates with the arc-shaped guide groove. The guide block is assembled in the arc-shaped guide groove, and the guide block moves along the arc-shaped guide groove when the cover rotates.

7. The electric heating device according to claim 6, characterized in that, The guide block has a raised edge on one side of its upper end. After the guide block is inserted into the arc guide groove, the raised edge is fastened to the limiting surface of the arc guide groove.

8. An electric furnace, characterized in that, include: The casing has a furnace cavity with an opening on the upper side, and an assembly step is provided around the opening of the furnace cavity. The side of the casing has wire holes. The electric heating device according to any one of claims 1 to 7, wherein the mounting and positioning part of the electric heating device is mounted on the upper side of the assembly step; An electrical wiring assembly, including a plug and power cords and detection cords for electrical connection, wherein the plug is electrically connected to a socket through a wire hole.

9. The electric furnace according to claim 8, characterized in that, The edge of the heating panel is a mounting and positioning part, which is connected to the assembly step by adhesive material; Alternatively, the upper end of the fixed shell is provided with an outwardly extending flanged connection part, which is a mounting and positioning part, and the mounting and positioning part is connected to the assembly step by adhesive material. Alternatively, the upper end of the fixed shell is provided with an outwardly extending flanged connection part, and the lower side of the flanged connection part is provided with several hooks for installation. The edge of the heating panel or the flanged connection part is the installation positioning part, and the hooks are fastened to the lower side of the assembly step.

10. An electric furnace, characterized in that, include: The casing has a furnace cavity with an opening on the upper side, and an assembly step is provided around the opening of the furnace cavity. The side of the casing has wire holes. The electric heating device according to any one of claims 1 to 7; The connecting ring includes an annular wall that is inserted into the opening of the furnace cavity, and a retaining edge that is disposed on the outer side of the upper end of the annular wall. The annular wall of the connecting ring is inserted into the opening of the furnace cavity, the retaining edge is fixed on the assembly step, the electric heating device is assembled inside the annular wall, and the mounting and positioning part of the electric heating device is installed on the upper side of the retaining edge. An electrical wiring assembly, including a plug and power cords and detection cords for electrical connection, wherein the plug is electrically connected to a socket through a wire hole.

11. The electric furnace according to claim 10, characterized in that, The edge of the heating panel is a mounting and positioning part, which is connected to the clip edge by adhesive material; Alternatively, the upper end of the fixed shell is provided with an outwardly extending flanged connecting part, which is a mounting and positioning part, and the mounting and positioning part is connected to the clip edge by adhesive material. Alternatively, the upper end of the fixed shell is provided with an outwardly extending flanged connection part, and the lower side of the flanged connection part is provided with several hooks for installation. The edge of the heating panel or the flanged connection part is the installation positioning part, and the hooks are fastened to the ring wall.

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