CN112533306A - Mica heating film capable of reducing contact resistance - Google Patents
Mica heating film capable of reducing contact resistance Download PDFInfo
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- CN112533306A CN112533306A CN202011443852.XA CN202011443852A CN112533306A CN 112533306 A CN112533306 A CN 112533306A CN 202011443852 A CN202011443852 A CN 202011443852A CN 112533306 A CN112533306 A CN 112533306A
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- terminal
- contact
- mica
- mica plate
- heating
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
- H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
- H05B3/28—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material
- H05B3/283—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material the insulating material being an inorganic material, e.g. ceramic
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Surface Heating Bodies (AREA)
- Resistance Heating (AREA)
Abstract
The invention belongs to the technical field of heating films, and particularly relates to a mica heating film capable of reducing contact resistance, which comprises an upper mica plate, a lower mica plate, an upper terminal, a lower terminal and a heating sheet; the lower terminal is arranged on the bottom surface of the lower mica plate, the upper terminal is arranged on the top surface of the upper mica plate, and the heating sheet is arranged between the top surface of the lower mica plate and the bottom surface of the upper mica plate; the upper terminal and the lower terminal are oppositely arranged and fixedly connected; the end part of the heating sheet is provided with a contact surface used for contacting with the upper terminal, and the contact surface is positioned between the upper terminal and the lower terminal; the mica plate is provided with a through hole, the bottom surface of the upper terminal is provided with a plurality of protrusions, and the protrusions penetrate through the through hole to be in contact with the contact surface. According to the invention, the plurality of bulges are arranged on the upper terminal, so that the contact stability and the contact area of the upper terminal and the heating sheet are increased, the contact resistance is effectively reduced, and the heating efficiency of the heating film is greatly improved.
Description
Technical Field
The invention belongs to the technical field of heating films, and particularly relates to a mica heating film capable of reducing contact resistance.
Background
In the electric heating equipment on the market at present, a lot of mica heating film spare parts have all been used for doing heating and fire-retardant material, and the electric current passes through the piece that generates heat of mica heating film, turns into heat energy with the electric energy and generates heat, and the mica plate in the mica electric heat membrane can play thermal-insulated and fire-retardant effect simultaneously, prevents to take place the incident. The upper layer and the lower layer of the heating film are mica plates, the middle layer is a heating sheet, and more metal sheets are used in the traditional heating sheet; since the heat generating film generates contact resistance when it is used in connection with a terminal, the higher the value of the contact resistance is, the lower the operating efficiency of the heat generating film becomes, and therefore, it is necessary to search for a mica heat generating film which can reduce the contact resistance.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the mica heating film capable of reducing the contact resistance, which can effectively reduce the contact resistance and greatly improve the heating efficiency of the heating film.
In order to achieve the purpose, the technical scheme of the invention is a mica heating film capable of reducing contact resistance, which comprises an upper mica plate, a lower mica plate, an upper terminal, a lower terminal and a heating sheet; the lower terminal is arranged on the bottom surface of the lower mica plate, the upper terminal is arranged on the top surface of the upper mica plate, and the heating sheet is arranged between the top surface of the lower mica plate and the bottom surface of the upper mica plate; the upper terminal and the lower terminal are oppositely arranged and fixedly connected; the end part of the heating sheet is provided with a contact surface used for contacting with the upper terminal, and the contact surface is positioned between the upper terminal and the lower terminal; the mica plate is provided with a through hole, the bottom surface of the upper terminal is provided with a plurality of protrusions, and the protrusions penetrate through the through hole to be in contact with the contact surface.
Furthermore, a plurality of concave pits formed by punching together with the plurality of protrusions are arranged on the top surface of the upper terminal.
Further, the thickness of the contact surface at the end of the heating sheet is 0.01-0.1 mm.
Further, the upper terminal comprises a first connecting part fixedly connected with the lower terminal, a second connecting part connected with an external circuit and a bending part for connecting the first connecting part and the second connecting part; the protrusion is disposed on a bottom surface of the first connection portion.
Furthermore, four corners of the lower terminal are respectively provided with four riveting claws, riveting holes are respectively formed in the positions, corresponding to the riveting claws, of the lower mica plate and the upper mica plate, and the riveting claws sequentially penetrate through the corresponding riveting holes in the lower mica plate and the corresponding riveting holes in the upper mica plate and then are bent and riveted on the upper terminal.
Further, the heating sheet is a graphene heating sheet.
Furthermore, the contact surfaces are arranged at two end parts of the heating sheet, the upper terminal and the lower terminal are respectively arranged above and below each contact surface, the through holes are arranged at positions on the upper mica plate corresponding to each contact surface, and the protrusions on each upper terminal are in contact with the corresponding contact surfaces through the corresponding through holes.
The design principle of the invention is as follows:
the heating film is in the in-process of using, and external circuit conducts the electric current to the piece that generates heat through last terminal, and at the in-process of conduction, except that the piece that generates heat itself has the resistance, the contact can produce a contact resistance in last terminal and the piece that generates heat, and this contact resistance is bigger, and the heating power of the piece that generates heat will be weakened greatly, so must reduce the contact resistance. Factors that affect contact resistance are contact material, positive pressure, surface state, voltage and current, etc. Different materials have different coefficients for contact resistance. The positive pressure of the contact means that the surfaces contacting each other generate a force perpendicular to the contact surfaces, the number and area of the contact micro-points are increased along with the increase of the positive pressure, and the contact micro-points are transited from elastic deformation to plastic deformation. The surface of the contact element is adhered and deposited with dust, oil stain and the like to form a loose surface film, and the surface film is easily distributed at the microscopic pits of the surface due to the fact that the surface film is provided with particulate matters, so that the contact area is reduced, and the contact resistance is increased. Theoretically, the contact resistance is composed of a shrinkage resistance and a film resistanceOf (A) RC＝Rs×RbWherein R isCIs the contact resistance, RsIs the shrinkage resistance, RbIs the surface film resistance.
From empirical calculation of contact resistance, RC＝Kc÷(0.102F)m；
Wherein, KcIs a relevant factor, which is related to the contact material, the surface condition, the contact form and; f is a contact pressure at the contact position, m is a coefficient relating to the contact form; as can be seen from the above formula, increasing the contact pressure results in a contact resistance RCThe reason for this is that the effective contact area of the contact point is increased, which can reduce the shrinkage resistance, and the influence of the surface film on the contact resistance is effectively suppressed, which can reduce the film resistance. When the contact pressure is increased and exceeds the yield strength of the material, plastic deformation is generated, the surface film is crushed, the contact surface of the metal is increased, and the contact resistance is rapidly reduced.
As known from the mechanics equation, F ═ PS, where P is the pressure and S is the force area. Under the condition that the pressure intensity is kept unchanged, the effective stress area is increased, and the effective contact pressure is increased.
In the mica heating film, the upper terminal and the heating sheet are riveted together by the riveting claw of the lower terminal, the riveting force is limited, and in the process of surface contact of the upper terminal and the heating sheet, the actual effective contact area is much smaller than the plane of the upper terminal because the grasping force of the riveting claw is not large enough, and the contact point is unstable, so that the difference of the total resistance value is more than 10 omega than the theoretical value, and the resistance value of the part is caused by overlarge contact resistance. In order to reduce the contact resistance of the heating film, the effective contact pressure of the upper terminal and the heating sheet can be increased, and the formula F is known as PS, so that the effective stressed area is increased, and the effective contact pressure can be increased.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, the plurality of bulges are arranged on the surface of the upper terminal, which is used for being connected with the heating sheet, and after the upper terminal is fixedly connected with the lower terminal, the bulges can be tightly pressed with the heating sheet, so that the contact stability and the contact area of the upper terminal and the heating sheet are increased, the contact resistance is effectively reduced, and the heating efficiency of the heating film is greatly improved;
(2) according to the invention, the contact surface of the end part of the heating sheet, which is used for being in contact with the upper terminal, is polished to ensure that the thickness of the contact surface is 0.01-0.1mm, the surface is smoother and smoother, and the film resistance is effectively reduced, so that the contact resistance is further reduced, and the heating efficiency of the heating film is improved;
(3) according to the invention, mica and graphene materials are combined together to prepare the heating film, so that the heating film can realize extremely rapid temperature rise and uniform heating, the electric energy conversion rate is more than ninety-nine percent, and the heating film is energy-saving and environment-friendly; the working voltage of the heating film is far lower than the safe voltage of a human body, and the upper layer and the lower layer are covered by high-temperature resistant mica plates, so that the safety is guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a mica heating film capable of reducing contact resistance according to an embodiment of the present invention;
FIG. 2 is an exploded view of a mica heating film with reduced contact resistance according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an upper terminal according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an upper terminal according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a heat generating sheet according to an embodiment of the present invention;
in the figure: 1. mounting a mica plate; 2. a mica plate is arranged; 3. a heat generating sheet; 4. an upper terminal; 5. a lower terminal; 6. a contact surface; 7. a through hole; 8. a protrusion; 9. a pit; 10. riveting a claw; 11. and (6) riveting holes.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1-5, an embodiment of the present invention provides a mica heating film capable of reducing contact resistance, which includes an upper mica plate 1, a lower mica plate 2, an upper terminal 4, a lower terminal 5, and a heating sheet 3; the lower terminal 5 is arranged on the bottom surface of the lower mica plate 2, the upper terminal 4 is arranged on the top surface of the upper mica plate 1, and the heating sheet 3 is arranged between the top surface of the lower mica plate 2 and the bottom surface of the upper mica plate 1; the upper terminal 4 and the lower terminal 5 are oppositely arranged and fixedly connected; the end of the heat generating sheet 3 has a contact surface 6 for contacting the upper terminal 4, the contact surface 6 is located between the upper terminal 4 and the lower terminal 5; go up to be equipped with through-hole 7 on the mica plate 1, be equipped with a plurality of archs 8 on the bottom surface of last terminal 4, arch 8 passes through-hole 7 with contact surface 6 contacts. This embodiment sets up a plurality of archs 8 through the one side that is used for being connected with heating sheet 3 on upper terminal 4, and after upper terminal 4 and lower terminal 5 fixed connection, these archs 8 will with the pressing tightly of heating sheet 3, increase upper terminal 4 and heating sheet 3's contact stability and area of contact to reduce contact resistance effectively, promote the efficiency of generating heat of heating film greatly.
The upper mica plate 1 and the lower mica plate 2 of the embodiment are both formed by pressing mica through gummed paper by a hot pressing technology and then cooling the mica; the heating sheet 3 is arranged in the middle layer between the upper mica plate 1 and the lower mica plate 2, the raw material of the heating sheet can be a square sheet (between 0.02 and 1mm), and the designed shape is obtained by a stamping technology or a laser engraving technology; in this embodiment, the through hole 7 may be square, as shown in fig. 2, the contact surface 6 at the end of the heat generating sheet 3 is also square, as shown in fig. 5, and the protrusion on the upper terminal 4 is connected to the square contact surface 6 through the square through hole 7 on the upper mica plate 1.
Further, a plurality of concave pits 9 formed by punching together with the plurality of protrusions 8 are formed on the top surface of the upper terminal 4.
Further, the thickness of the contact surface 6 at the end of the heating sheet 3 is 0.01-0.1 mm. In the embodiment, the contact surface 6 at the end of the heating plate 3 is deposited on the surface of the contact point to form a loose surface film due to the attachment of dust, oil stain and the like, the surface film is easy to distribute at microscopic pits of the surface due to the existence of particulate matters, so that the contact area is reduced, and the contact resistance is increased, therefore, the embodiment adopts a mechanical polishing method, the surface is polished to the thickness of 0.01 to 0.1mm under a mechanical polishing rod which runs at a high speed, the surface film is removed after polishing, the surface film becomes flat and smooth, the film resistance is very small, the surface film resistance is well matched with the upper terminal 4 with the bulge 8, and the contact resistance is further reduced. This embodiment is used for the one side design a plurality of archs that are connected with heating plate 3 through last terminal 4 and polishes the contact surface 6 of 3 tip of heating plate to thickness for 0.01 to 0.1mm, makes originally contact resistance more than 10 omega drop to within 1 omega for the efficiency that generates heat of heating film promotes greatly.
Further, the upper terminal 4 includes a first connection portion for fixedly connecting with the lower terminal 5, a second connection portion for connecting with an external circuit, and a bent portion for connecting the first connection portion and the second connection portion; the protrusion 8 is disposed on a bottom surface of the first connection portion. As shown in fig. 4 and 5, the upper terminal 4 of the present embodiment is used with the lower terminal 5, and the first connecting portion of the lower terminal 5 is horizontally disposed for connection with the heat generating sheet 3, and the second connecting portion is folded for connection with an external circuit.
Furthermore, four corners of the lower terminal 5 are respectively provided with four riveting claws 10, the positions of the lower mica plate 2 and the upper mica plate 1 corresponding to the riveting claws 10 are respectively provided with riveting holes 11, and each riveting claw 10 sequentially penetrates through the corresponding riveting hole 11 of the lower mica plate 2 and the corresponding riveting hole 11 of the upper mica plate 1 and then is bent and riveted on the upper terminal 4. As shown in fig. 2, in the present embodiment, four riveting claws 10 at four corners of the lower terminal 5 respectively penetrate through corresponding riveting holes 11 on the lower mica plate 2 and corresponding riveting holes 11 on the upper mica plate 1 in sequence, and then are bent by a riveting press machine, so as to achieve the purpose of tightly holding the lower terminal 5.
Further, the heat generating sheet 3 in this embodiment may be a metal sheet, preferably a graphene heat generating sheet, or a heat generating sheet made of other materials. The graphene heating sheet is prepared by taking graphene powder as a material, a low-resistance heating film prepared by utilizing the extremely low field effect sheet resistance of a graphite material is heated at an extremely high speed and uniformly heated under the condition of electrification, and far infrared life light waves are utilized to permeate into circulation and subcutaneous tissues, so that blood is promoted to improve the body function, and the physiotherapy effect is achieved; the electric conversion rate of the graphene is as high as ninety-nine percent, the graphene is energy-saving compared with the traditional electric heating, the application field is wide, the graphene can be used for baking and family heating, the working voltage of the graphene is far lower than the safety voltage of a human body, and the safety is guaranteed.
Further, the contact surfaces 6 are respectively arranged at two end portions of the heating sheet 3, the upper terminal 4 and the lower terminal 5 are respectively arranged above and below each contact surface 6, the through hole 7 is arranged at a position on the upper mica plate 1 corresponding to each contact surface 6, and the protrusion 8 on each upper terminal 4 is in contact with the corresponding contact surface 6 through the corresponding through hole 7.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A mica heating film capable of reducing contact resistance is characterized in that: comprises an upper mica plate, a lower mica plate, an upper terminal, a lower terminal and a heating sheet; the lower terminal is arranged on the bottom surface of the lower mica plate, the upper terminal is arranged on the top surface of the upper mica plate, and the heating sheet is arranged between the top surface of the lower mica plate and the bottom surface of the upper mica plate; the upper terminal and the lower terminal are oppositely arranged and fixedly connected; the end part of the heating sheet is provided with a contact surface used for contacting with the upper terminal, and the contact surface is positioned between the upper terminal and the lower terminal; the mica plate is provided with a through hole, the bottom surface of the upper terminal is provided with a plurality of protrusions, and the protrusions penetrate through the through hole to be in contact with the contact surface.
2. The mica heating film capable of reducing contact resistance as set forth in claim 1, wherein: and a plurality of pits formed by stamping together with the plurality of bulges are arranged on the top surface of the upper terminal.
3. The mica heating film capable of reducing contact resistance as set forth in claim 1, wherein: the thickness of the contact surface at the end part of the heating sheet is 0.01-0.1 mm.
4. The mica heating film capable of reducing contact resistance as set forth in claim 1, wherein: the upper terminal comprises a first connecting part fixedly connected with the lower terminal, a second connecting part connected with an external circuit and a bending part connected with the first connecting part and the second connecting part; the protrusion is disposed on a bottom surface of the first connection portion.
5. The mica heating film capable of reducing contact resistance as set forth in claim 1, wherein: four corners of the lower terminal are respectively provided with four riveting claws, riveting holes are formed in the positions, corresponding to the riveting claws, of the lower mica plate and the upper mica plate, and the riveting claws sequentially penetrate through the corresponding riveting holes in the lower mica plate and the corresponding riveting holes in the upper mica plate and then are bent and riveted on the upper terminal.
6. The mica heating film capable of reducing contact resistance as set forth in claim 1, wherein: the heating sheet is a graphene heating sheet.
7. The mica heating film capable of reducing contact resistance as set forth in any one of claims 1 to 6, wherein: the two end parts of the heating sheet are respectively provided with the contact surfaces, the upper terminal and the lower terminal are respectively arranged above and below each contact surface, the through holes are respectively arranged at the positions, corresponding to the contact surfaces, on the upper mica plate, and the protrusions on the upper terminals are in contact with the corresponding contact surfaces through the corresponding through holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011443852.XA CN112533306A (en) | 2020-12-11 | 2020-12-11 | Mica heating film capable of reducing contact resistance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011443852.XA CN112533306A (en) | 2020-12-11 | 2020-12-11 | Mica heating film capable of reducing contact resistance |
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| CN112533306A true CN112533306A (en) | 2021-03-19 |
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| CN202011443852.XA Pending CN112533306A (en) | 2020-12-11 | 2020-12-11 | Mica heating film capable of reducing contact resistance |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10247029A (en) * | 1997-03-04 | 1998-09-14 | Minolta Co Ltd | Heating roller device |
| CN2836389Y (en) * | 2005-06-20 | 2006-11-08 | 吴敬开 | Electrical connection structure of heating device |
| CN208434137U (en) * | 2018-06-21 | 2019-01-25 | 烟台希努吉电子有限公司 | It is a kind of to rivet with lower terminal, riveting component and automobile rearview mirror heating component |
| CN110117765A (en) * | 2019-05-17 | 2019-08-13 | 广东省新材料研究所 | A kind of TiO2Base electro-thermal coatings and preparation method thereof |
| CN212086517U (en) * | 2020-05-21 | 2020-12-04 | 何丽萍 | Clamping structure for heating plate |
-
2020
- 2020-12-11 CN CN202011443852.XA patent/CN112533306A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10247029A (en) * | 1997-03-04 | 1998-09-14 | Minolta Co Ltd | Heating roller device |
| CN2836389Y (en) * | 2005-06-20 | 2006-11-08 | 吴敬开 | Electrical connection structure of heating device |
| CN208434137U (en) * | 2018-06-21 | 2019-01-25 | 烟台希努吉电子有限公司 | It is a kind of to rivet with lower terminal, riveting component and automobile rearview mirror heating component |
| CN110117765A (en) * | 2019-05-17 | 2019-08-13 | 广东省新材料研究所 | A kind of TiO2Base electro-thermal coatings and preparation method thereof |
| CN212086517U (en) * | 2020-05-21 | 2020-12-04 | 何丽萍 | Clamping structure for heating plate |
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Address after: No. 242, Tongcheng Avenue, Tongcheng County, Xianning City, Hubei Province 437400 Applicant after: Hubei Ping'an Electric Technology Co.,Ltd. Address before: No. 226, Yuli Avenue, junshui Town, Tongcheng County, Xianning City, Hubei Province 437400 Applicant before: PAMICA ELECTRIC MATERIAL (HUBEI) Co.,Ltd. |
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Application publication date: 20210319 |