Film-shaped electric heating element and electric heating equipment
By using a nickel-chromium heating layer and a film-type heating element with a planar structure, the problem of localized overheating of the heating coating is solved, resulting in a more uniform heat distribution and a longer service life, thus improving the stability and heat transfer efficiency of the heating element.
Patent Information
- Application Number
- CN202422797772.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-11-15
AI Technical Summary
The heating coating of existing heating films exists in strip form, resulting in a large area per unit power, increased surface load, easy local overheating, and short lifespan.
A nickel-chromium heating layer is used as the heating coating. The lower end of the substrate is the cold end, and the electrode is located below the heating coating. The conductive coating connects the electrode and the heating coating to form a planar structure, which reduces the use of rare metals, improves the uniformity and stability of heat distribution, and avoids short circuits caused by electrode melting at high temperatures.
This achieves more uniform heat distribution, reduces temperature gradient and thermal stress, extends service life, improves heat transfer efficiency, avoids local overheating and electrode short circuits, and enhances the stability of the heating coating.
Smart Images
Figure CN223452110U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to thick film heating technical field especially relates to a film -shaped electric heating element and electric heating equipment. BACKGROUND
[0002] In the heating film technology, the electric heating paste is one of the key influencing factors. The electric heating paste has a great influence on the performance of the heating film. The electric heating paste is made into a heating coating covering on the substrate. The paste is usually printed on the substrate in the form of a strip. However, the heating coating in the form of a strip is prone to local overheating due to the large unit power area and the increased surface load, which may cause the film to burn and shorten the service life. SUMMARY
[0003] The utility model aims at at least in a certain extent solves one of the technical problems in the prior art. To this end, the utility model provides a film -shaped electric heating element and electric heating equipment.
[0004] In the first aspect, the utility model embodiment provides a film -shaped electric heating element, the film -shaped electric heating element includes:
[0005] The substrate is provided with a heating coating, the heating coating is a nickel-chromium heating layer, the heating coating is in the form of a surface and covers the surface of the substrate.
[0006] The electrode group includes a first electrode and a second electrode, the first electrode and the second electrode are arranged on the surface of the substrate and located below the heating coating, the first electrode is connected with the heating coating through the first conductive coating, and the second electrode is connected with the heating coating through the second conductive coating.
[0007] When the substrate is rolled into a cylindrical shape, the lower end of the substrate is a cold end.
[0008] According to the film -shaped electric heating element of the utility model embodiment, at least has the following technical effect: the heating coating of the film -shaped electric heating element is a nickel-chromium heating layer, the nickel-chromium heating layer is made of nickel-chromium paste, instead of traditional palladium series paste or ruthenium series paste, reduces the use amount of rare metal, thereby reduces the manufacturing cost, so that the heating coating is in the form of a surface, so that the heat distribution is more uniform, the contact area is increased to help improve the heat transfer efficiency, and the temperature gradient in the heating coating is reduced, the thermal stress and deformation are reduced, the overall stability of the heating coating is improved, so that the heating coating is resistant to dry burning and sudden load impact, and since the lower end of the substrate is a cold end, the first electrode and the second electrode are located below the heating coating, the electrode group can be prevented from being melted and soldered due to high temperature, thereby prolonging the service life of the film -shaped electric heating element.
[0009] According to some embodiments of the present application, the first conductive coating is strip-shaped and arranged on the surface of the base body, the first conductive coating extends in the up-down direction, the right side of the first conductive coating is connected with the heat generating coating, and the lower end of the first conductive coating is connected with the first electrode.
[0010] According to some embodiments of the present application, the second conductive coating is strip-shaped and arranged on the surface of the base body, the second conductive coating extends in the up-down direction, the left side of the second conductive coating is connected with the heat generating coating, and the lower end of the second conductive coating is connected with the second electrode.
[0011] According to some embodiments of the present application, the heat generating coating comprises a first heat generating surface and a second heat generating surface, the first heat generating surface is located above the second heat generating surface, the first electrode is connected with the first heat generating surface and the second heat generating surface through the first conductive coating, the electrode group further comprises a third electrode, the third electrode is located below the second heat generating surface, the second electrode is connected with the first heat generating surface through the second conductive coating, and the third electrode is connected with the second heat generating surface through the third conductive coating.
[0012] According to some embodiments of the present application, the heat generating coating further comprises a third heat generating surface, the third heat generating surface is located below the second heat generating surface, the first electrode is connected with the third heat generating surface through the first conductive coating, the electrode group further comprises a fourth electrode, the fourth electrode is located below the third heat generating surface, and the fourth electrode is connected with the third heat generating surface through the fourth conductive coating.
[0013] According to some embodiments of the present application, the base body is aluminum, carbon steel, cast iron, stainless steel, copper or copper alloy.
[0014] According to some embodiments of the present application, a first insulating layer is arranged between the surface of the base body and the heat generating coating.
[0015] According to some embodiments of the present application, a second insulating layer covers the side of the heat generating coating away from the base body.
[0016] According to some embodiments of the present application, the heat generating coating comprises nickel powder, chromium powder, glass powder and an organic carrier.
[0017] In the second aspect, the application also provides an electric heating device comprising the film-shaped electric heating element according to the first aspect of the application.
[0018] The electric heating device according to the application has at least the following technical effects:
[0019] Additional aspects and advantages of the present application will be set forth in part in the following description, and in part will become apparent to those skilled in the art upon examination of the following description, or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS
[0020] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the following drawings, in which:
[0021] Figure 1 is a structural diagram of a film-shaped electric heating element of some embodiments of the present application;
[0022] Figure 2 is an expanded view of a film-shaped electric heating element of some embodiments of the present application;
[0023] Figure 3 is an expanded view of another film-shaped electric heating element of some embodiments of the present application;
[0024] Figure 4 is an expanded view of another film-shaped electric heating element of some embodiments of the present application;
[0025] Figure 5 is a sectional view of a film-shaped electric heating element of some embodiments of the present application.
[0026] BRIEF DESCRIPTION OF DRAWINGS
[0027] Base body 100, heating coating 110, first heating surface 111, second heating surface 112, third heating surface 113, first insulating layer 141, second insulating layer 142;
[0028] Electrode group 200, first electrode 210, second electrode 220, third electrode 230, fourth electrode 240;
[0029] First conductive coating 310, second conductive coating 320, third conductive coating 330, fourth conductive coating 340. DETAILED DESCRIPTION
[0030] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and should not be understood as limiting the present application.
[0031] In the description of the utility model, if the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. Understand as not including the number, above, below, within, etc. Understand as including the number. If it is described to the first, the second is only used for distinguishing the purpose of technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.
[0032] In the description of the utility model, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. Understand as not including the number, above, below, within, etc. Understand as including the number. If it is described to the first, the second is only used for distinguishing the purpose of technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.
[0033] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection, etc. Should be understood broadly, and the person skilled in the art can determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.
[0034] The utility model embodiment is further described below with reference to the drawings.
[0035] According to some embodiments of the utility model, refer to Figure 1 And Figure 2 The film-shaped electric heating element includes a base body 100 and an electrode group 200. The base body 100 is provided with a heating coating layer 110, the heating coating layer 110 is a nickel-chromium heating layer, the heating coating layer 110 is covered on the surface of the base body 100 by screen printing technology, and the heating coating layer 110 is in a surface shape and covers the surface of the base body 100. The electrode group 200 includes a first electrode 210 and a second electrode 220, the first electrode 210 and the second electrode 220 are arranged on the surface of the base body 100 and below the heating coating layer 110, the first electrode 210 is connected with the heating coating layer 110 through a first conductive coating layer 310, and the second electrode 220 is connected with the heating coating layer 110 through a second conductive coating layer 320. When the base body 100 is rolled into a cylindrical shape, the heating coating layer 110 is located on the outer peripheral wall. The lower end of the base body 100 is a cold end. The first conductive coating layer 310 and the second conductive coating layer 320 are conductive silver. The conductive silver can play the role of conducting electricity, the electrode group 200 is connected with an external power supply, and the heating coating layer 110 can heat after being powered on to transfer heat to the base body 100.
[0036] The film-shaped electric heating element can be applied to various electric heating devices, such as instant double-mode water heaters, instant electric water heaters, hair straighteners, hair curlers, automobile exhaust oxidation sensors, industrial equipment heaters, ultrasonic electric heating elements, mold heating and heat preservation devices, medical instrument heaters, air heaters, and small heating appliances.
[0037] It can be understood that the heating coating 110 of the film-shaped electric heating element is a nickel-chromium heating layer made of a nickel-chromium slurry, which replaces a traditional palladium-based slurry or a ruthenium-based slurry, reduces the use amount of rare metals, and thus reduces the manufacturing cost. Therefore, the heating coating 110 is in a planar shape, so that the heat distribution is more uniform, the contact area is increased to help improve the heat transfer efficiency, the temperature gradient in the heating coating 110 is reduced, the thermal stress and deformation are reduced, the overall stability of the heating coating 110 is improved, the heat conduction rate is improved, and under the same heating power, the larger heating area can provide more heat flow, so that the heat transfer speed is accelerated. Thus, the heating coating 110 is resistant to dry burning and sudden load impact. Moreover, the surface load of the planar heating coating 110 is low, the service life is longer, and local overheating is avoided. Such uniformity reduces thermal stress and reduces the risk of material fatigue and damage. In addition, since the lower end of the base 100 is a cold end, the first electrode 210 and the second electrode 220 are located below the heating coating 110, which can avoid short circuit caused by melting solder of the electrode group 200 due to high temperature, and improve the service life of the film-shaped electric heating element.
[0038] Preferably, referring to Figure 2 , the first conductive coating 310 is in a strip shape and is arranged on the surface of the base 100, the first conductive coating 310 extends in the up-down direction, the right side of the first conductive coating 310 is connected with the heating coating 110, and the lower end of the first conductive coating 310 is connected with the first electrode 210.
[0039] Preferably, referring to Figure 2 , the second conductive coating 320 is in a strip shape and is arranged on the surface of the base 100, the second conductive coating 320 extends in the up-down direction, the left side of the second conductive coating 320 is connected with the heating coating 110, and the lower end of the second conductive coating 320 is connected with the second electrode 220.
[0040] According to some embodiments of the present application, referring to Figure 3, the heating coating 110 includes a first heating surface 111 and a second heating surface 112, the first heating surface 111 is located above the second heating surface 112, the first electrode 210 is connected with the first heating surface 111 and the second heating surface 112 through the first conductive coating 310 respectively, the electrode group 200 further includes a third electrode 230, the third electrode 230 is located below the second heating surface 112, the second electrode 220 is connected with the first heating surface 111 through the second conductive coating 320, and the third electrode 230 is connected with the second heating surface 112 through the third conductive coating 330. The third conductive coating 330 is conductive silver.
[0041] In the case that the first electrode 210 is connected to the circuit, the second electrode 220 is connected to the circuit, and the first heating surface 111 starts to heat; the third electrode 230 is connected to the circuit, and the second heating surface 112 starts to heat. The first heating surface 111 and the second heating surface 112 can heat independently of each other, so as to adapt to different needs.
[0042] According to some embodiments of the present application, referring to Figure 4 , the heating coating 110 further includes a third heating surface 113, the third heating surface 113 is located below the second heating surface 112, the first electrode 210 is connected with the third heating surface 113 through the first conductive coating 310, and the electrode group 200 further includes a fourth electrode 240, the fourth electrode 240 is located below the third heating surface 113, and the fourth electrode 240 is connected with the third heating surface 113 through the fourth conductive coating 340. The fourth conductive coating 340 is conductive silver.
[0043] In the case that the first electrode 210 is connected to the circuit, the second electrode 220 is connected to the circuit, and the first heating surface 111 starts to heat; the third electrode 230 is connected to the circuit, and the second heating surface 112 starts to heat; the fourth electrode 240 is connected to the circuit, and the third heating surface 113 starts to heat. The first heating surface 111, the second heating surface 112 and the third heating surface 113 can heat independently of each other, so as to adapt to different needs.
[0044] It can be understood that the thick film heating body mesh circuit pattern can be designed with multiple heating surfaces and different powers for heating, thereby realizing flexible power adjustment. The design of the surface heating pattern allows the power output to be adjusted by changing the input of current or using different resistance materials. This flexibility enables the system to be adjusted according to actual needs, realizing multiple power modes; distributed heat sources; this can more easily control the heating intensity of each area. By selectively activating different areas, different power outputs can be achieved to meet various application needs; the surface heating structure can more effectively manage heat and avoid local overheating. In different power modes, the system can monitor the temperature in real time and realize dynamic adjustment to maintain the required performance level.
[0045] Preferably, the base body 100 is made of aluminum, carbon steel, cast iron, stainless steel, copper or copper alloy, which has good comprehensive mechanical properties.
[0046] According to some embodiments of the present application, referring to Figure 5 , the surface of the base body 100 is provided with a first insulating layer 141 between the base body 100 and the heating coating 110. The side of the heating coating 110 away from the base body 100 is covered with a second insulating layer 142. The first insulating layer 141 and the second insulating layer 142 can prevent the heating coating 110 from electric leakage, thereby enhancing safety.
[0047] According to some embodiments of the present application, the heating coating 110 comprises nickel powder, chromium powder, glass powder and an organic carrier. The nickel-chromium heating layer is made of nickel-chromium slurry, and the nickel-chromium slurry is prepared from raw materials comprising the following mass percentages: nickel powder 50% to 70%, chromium powder 10% to 25%, glass powder 2% to 6%, and organic carrier 15% to 25%. The particle size distribution D50 of the nickel powder is 3 to 5 microns, and the particle size distribution D50 of the chromium powder is 1 to 3 microns. The organic carrier comprises a solvent, a resin and an additive. The organic carrier is prepared from raw materials comprising the following mass percentages: solvent 80% to 92%, resin 5% to 10%, and additive 3% to 6%. The additive comprises at least one of oleic acid, Span-85, lecithin and polyethylene glycol. In the nickel-chromium slurry, the addition of an appropriate amount of organic carrier can adjust the viscosity of the electrothermal slurry, so that the electrothermal slurry has a suitable viscosity, and the convenience of the electrothermal slurry in use can be improved. After the nickel powder, the chromium powder and the glass powder are ball milled in a reaction kettle, the organic carrier is added for stirring, mixing and uniform dispersion, and then the three-roll rolling is performed.
[0048] In the description of the present application, the description referring to the term "some embodiments" means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above-mentioned term does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0049] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.
Claims
1. A film-shaped electric heating element, characterized in that: include: A substrate (100), wherein the substrate (100) is provided with a heating coating (110), wherein the heating coating (110) is a nickel-chromium heating layer, and the heating coating (110) is planar and covers the surface of the substrate (100); An electrode group (200) comprises a first electrode (210) and a second electrode (220), wherein the first electrode (210) and the second electrode (220) are both arranged on the surface of the substrate (100) and located below the heating coating (110), the first electrode (210) and the heating coating (110) are connected via a first conductive coating (310), and the second electrode (220) and the heating coating (110) are connected via a second conductive coating (320); When the base body (100) is rolled into a cylindrical shape, the lower end of the base body (100) serves as a cold end.
2. The film-shaped electric heating element according to claim 1, characterized in that: The first conductive coating (310) is strip-shaped and is provided on the surface of the substrate (100). The first conductive coating (310) extends in an up-down direction. The right side of the first conductive coating (310) is connected to the heating coating (110), and the lower end of the first conductive coating (310) is connected to the first electrode (210).
3. The film-shaped electric heating element according to claim 1, characterized in that: The second conductive coating (320) is strip-shaped and is provided on the surface of the substrate (100). The second conductive coating (320) extends in the up-down direction. The left side of the second conductive coating (320) is connected to the heating coating (110), and the lower end of the second conductive coating (320) is connected to the second electrode (220).
4. The film-shaped electric heating element according to claim 1, characterized in that: The heating coating (110) includes a first heating surface (111) and a second heating surface (112), wherein the first heating surface (111) is located above the second heating surface (112), and the first electrode (210) is connected to the first heating surface (111) and the second heating surface (112) respectively through the first conductive coating (310). The electrode group (200) further includes a third electrode (230), wherein the third electrode (230) is located below the second heating surface (112), the second electrode (220) is connected to the first heating surface (111) through the second conductive coating (320), and the third electrode (230) is connected to the second heating surface (112) through the third conductive coating (330).
5. The film-shaped electric heating element according to claim 4, characterized in that: The heating coating (110) further includes a third heating surface (113), the third heating surface (113) is located below the second heating surface (112), the first electrode (210) is connected to the third heating surface (113) via the first conductive coating (310), and the electrode group (200) further includes a fourth electrode (240), the fourth electrode (240) is located below the third heating surface (113), and the fourth electrode (240) is connected to the third heating surface (113) via a fourth conductive coating (340).
6. The film-shaped electric heating element according to claim 1, characterized in that: The substrate (100) is made of aluminum, carbon steel, cast iron, stainless steel, copper or a copper alloy.
7. The film-shaped electric heating element according to claim 1, characterized in that: A first insulating layer (141) is provided between the surface of the substrate (100) and the heating coating (110).
8. The film-shaped electric heating element according to claim 7, characterized in that: The side of the heat-generating coating (110) away from the substrate (100) is covered with a second insulating layer (142).
9. An electric heating device, characterized in that: The invention comprises a film-shaped electric heating element as described in any one of claims 1 to 8.