CN214675731U

CN214675731U - Electrothermal film

Info

Publication number: CN214675731U
Application number: CN202120764572.2U
Authority: CN
Inventors: 朱其朋; 周银妹; 周文舟; 刘俊; 李群力
Original assignee: Changzhou Changqing Technology Co Ltd
Current assignee: Changzhou Changqing Technology Co Ltd
Priority date: 2021-04-14
Filing date: 2021-04-14
Publication date: 2021-11-09
Anticipated expiration: 2031-04-14

Abstract

The utility model discloses an electrothermal film, its main points are: comprises an outer cladding layer, a heating core layer and an electric connecting sheet component. The outer coating layer consists of an upper surface layer and a bottom layer, and the heating core layer is coated by the outer coating layer and is positioned between the upper surface layer and the bottom layer of the outer coating layer. The heating core layer is formed by laying conductive heating strips, the head and the tail of each conductive heating strip are respectively provided with a positive electrode connecting part and a negative electrode connecting part, and the part between the positive electrode connecting part and the negative electrode connecting part of each conductive heating strip is a heating part. The distance between the adjacent parallel parts of the heating parts is gradually reduced from inside to outside. The electrical connection sheet assembly comprises a positive electrical connection sheet and a negative electrical connection sheet. The positive electrode electric connecting sheet and the negative electrode electric connecting sheet are both made of metal conductive materials. The positive electrode electric connection sheet is fixedly connected and electrically connected on the outer coating layer and is electrically connected on the positive electrode connection part. The negative electrode electric connection sheet is fixedly connected to the outer cladding layer and is electrically connected to the negative electrode connection part.

Description

Electrothermal film

Technical Field

The utility model relates to an electric heat membrane technical field specifically is an electric heat membrane that is arranged in electric heating system such as ground, wall, ceiling, seat, vehicle floor.

Background

The electrothermal film in the electric heating system is a film product which can generate heat after being electrified, is made by processing and packaging conductive materials such as conductive special printing ink, metal current carrying strips and the like between insulating films, and belongs to a low-temperature radiation electrothermal film. The electrothermal film sends heat into the space in a radiation mode, so that a human body feels warm, and the comprehensive effect of the electrothermal film is superior to that of the traditional convection heating mode. The heating system is generally composed of a power supply, a temperature controller, a connecting piece, an insulating layer, an electrothermal film and a decorative layer. The power supply is communicated with the electrothermal film through a lead to convert electric energy into heat energy. The ground electric heating system is not only suitable for the north, but also suitable for areas without heating facilities in winter. The electrothermal film is not only widely applied to heating systems of civil buildings such as houses, schools, shops, hospitals and office buildings, but also widely applied to heating systems of industrial buildings such as factory buildings and warehouses. The electrothermal film is also applied to heating systems of floors or wallboards of railway vehicles, the fields of road snow melting and the like, and has wide application prospect. Because the electric heating film is planar, the heat dissipation speed of each part of the electric heating film is different, the phenomena of overheating at the central part and lower temperature at the periphery generally exist, and the high-temperature service life of the middle part is reduced and even the electric heating film is burnt out easily.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a simple structure, electric heat membrane temperature distribution is even, is favorable to increase of service life and improves the electric heat membrane of safety in utilization.

Realize the utility model discloses the basic technical scheme of purpose is: an electrothermal film, its structural feature is: comprises an outer cladding layer, a heating core layer and an electric connecting sheet component. The outer coating layer consists of an upper surface layer and a bottom layer, and the heating core layer is coated by the outer coating layer and is positioned between the upper surface layer and the bottom layer of the outer coating layer. The heating core layer is formed by laying conductive heating strips, the head and the tail of each conductive heating strip are respectively provided with a positive electrode connecting part and a negative electrode connecting part, and the part between the positive electrode connecting part and the negative electrode connecting part of each conductive heating strip is a heating part. The distance between the adjacent parallel parts of the heating parts is gradually reduced from inside to outside. The electrical connection sheet assembly comprises a positive electrical connection sheet and a negative electrical connection sheet. The positive electrode electric connecting sheet and the negative electrode electric connecting sheet are both made of metal conductive materials. The positive electrode electric connection sheet is fixedly connected and electrically connected on the outer coating layer and is electrically connected on the positive electrode connection part. The negative electrode electric connection sheet is fixedly connected to the outer cladding layer and is electrically connected to the negative electrode connection part.

The further technical scheme based on the basic technical scheme is as follows: the conductive sectional area of the heating part is gradually reduced from inside to outside.

The further technical scheme based on the technical schemes is as follows: the heating part comprises an inner heating part, an inner ring heating part and an outer ring heating part. The inner heating part, the inner ring heating part and the outer ring heating part are connected in parallel on the positive electrode connecting part and the negative electrode connecting part. The inner heating part, the inner ring heating part and the outer ring heating part are sequentially arranged from inside to outside, the inner ring heating part is arranged around the inner heating part, and the outer ring heating part is arranged around the inner ring heating part. The conductive cross-sectional areas of the inner heating part, the inner ring heating part and the outer ring heating part are gradually increased.

The further technical scheme based on the corresponding technical schemes is as follows: the conductive heating strip of the heating core layer is made of metal materials, and the conductive heating strip is made of metal foils compounded on the bottom layer of the cladding outer layer through a printing etching method.

Realize the utility model discloses another technical scheme of purpose is: an electrothermal film, its structural feature is: comprises an outer cladding layer, a heating core layer and an electric connecting sheet component. The outer coating layer consists of an upper surface layer and a bottom layer, and the heating core layer is coated by the outer coating layer and is positioned between the upper surface layer and the bottom layer of the outer coating layer. The heating core layer is formed by laying conductive heating strips, the head and the tail of each conductive heating strip are respectively provided with a positive electrode connecting part and a negative electrode connecting part, and the part between the positive electrode connecting part and the negative electrode connecting part of each conductive heating strip is a heating part. The space between the adjacent parallel parts of the heating parts is gradually increased from inside to outside, and the conductive sectional area of the heating parts is gradually reduced from inside to outside. The electrical connection sheet assembly comprises a positive electrical connection sheet and a negative electrical connection sheet. The positive electrode electric connecting sheet and the negative electrode electric connecting sheet are both made of metal conductive materials. The positive electrode electric connection sheet is fixedly connected and electrically connected on the outer coating layer and is electrically connected on the positive electrode connection part. The negative electrode electric connection sheet is fixedly connected to the outer cladding layer and is electrically connected to the negative electrode connection part.

The further technical scheme based on the technical scheme is as follows: the conductive heating strip of the heating core layer is made of metal materials, and the conductive heating strip is made of metal foils compounded on the bottom layer of the cladding outer layer through a printing etching method.

The utility model discloses following beneficial effect has: (1) the utility model discloses an electric heat membrane simple structure has broken through the mode that traditional evenly distributed set up, has adopted brand-new design theory. According to the electric heat membrane service environment and heated surface (floor, wallboard, etc.) heat transfer and heat dissipation condition, adjust electric heat membrane power density distribution (adjust the interval of the portion that generates heat or the electrically conductive sectional area of the portion that generates heat), when the occasion that heat transfer and heat dissipation are faster, heated surface temperature presents great gradient, electric heat membrane central temperature is high, peripheral temperature is low, through improving electric heat membrane peripheral power density, reduce the power density in the middle of the electric heat membrane, guarantee that electric heat membrane whole temperature distributes evenly, prevent local temperature too high, increase of service life and safety in utilization.

(2) The electric heating film (such as a carbon crystal electric heating film) used in the traditional civil building generally has the power attenuation and the great attenuation within about 3 to 5 years, the service life is mostly about 10 to 15 years, and the general design life of the rail vehicle is 30 years, so that the electric heating film is not suitable for the rail vehicle. And the utility model discloses a sandwich layer that generates heat of electric heat membrane is made for metal material, and the metal resistance circular telegram generates heat, and each side electric properties is reliable and stable, and power decay is very little, and the design life can reach more than 35 years, is applicable to among the rail vehicle heating system.

(3) The utility model discloses a sandwich layer that generates heat of electric heat membrane is metal material, leans on the metal resistance circular telegram to generate heat, is pure resistive, and the efficiency of generating heat is more than 99%. And metal resistivity is positive temperature coefficient, rises to certain extent when the electric heat membrane temperature, and resistance grow, and power reduces, and restriction electric heat membrane temperature further rises, reaches balanced state very fast, consequently the utility model discloses a metal electric heat membrane has certain self-limiting temperature characteristic, and the safety in utilization improves greatly.

(4) The utility model discloses a snakelike S distribution mode has been adopted in the portion that generates heat of electrothermal film 'S metal electrothermal film, and adjacent metal strip parallel portion' S current opposite direction, according to right-hand spiral rule, the magnetic field that the metal strip produced on the metal electrothermal film can offset each other, reduces the interference to other equipment on the rail vehicle, uses the reliability further to improve.

(5) The electric heating film of the embodiment 1 of the utility model realizes the uniform distribution of temperature by changing the distance between the adjacent parts parallel to each other of the heating parts, the middle part is slow in heat dissipation, the distance between the heating parts is large, the heating amount is small, the outside heat can be radiated to the inner side, and the middle part is ensured to reach the set temperature; the periphery is fast dispelled the heat, and the portion interval that generates heat is little, and calorific capacity is big, and some heat is to the inboard radiation, guarantees inboard temperature, and some heat is to the periphery radiation to guarantee that the periphery reaches the temperature of setting for, make the temperature distribution of whole electric heat membrane comparatively even, the difference in temperature is within 5 ℃.

(6) The electric heating film of the embodiment 2 of the utility model realizes the uniform distribution of temperature by changing the conductive cross section area and the distance between the adjacent parallel parts of the heating parts, the middle heating value is small, the heating area is increased to ensure the middle temperature; the surrounding heat productivity is large, the heating area is reduced, the surrounding temperature is ensured, and the temperature difference is within 5 ℃.

(7) Embodiment 3 the electric heat membrane realize holistic temperature evenly distributed through the three parallelly connected portion that generates heat, middle part calorific capacity is little, the heat that generates heat to middle radiation through the inner ring reaches the temperature of setting for, the outside heat dissipation of the portion that generates heat of outer loop is fast, the portion that generates heat through the inner ring is radiated to the portion that generates heat of outer loop, makes the outer loop portion that generates heat keep the temperature of setting for to the temperature of whole electric heat membrane keeps evenly, and the difference in temperature is within 5 ℃. Secondly, the use reliability is greatly improved, the three heating parts connected in parallel generate heat independently, if the three heating parts are damaged, other parts can continue to work, and the emergency function is realized.

Drawings

Fig. 1 is a schematic structural view of an electrothermal film according to embodiment 1 of the present invention.

Fig. 2 is a schematic structural view of an electrothermal film according to embodiment 2 of the present invention.

Fig. 3 is a schematic structural view of an electrothermal film according to embodiment 3 of the present invention.

Fig. 4 is a schematic structural view of an electrothermal film according to embodiment 4 of the present invention.

The reference numbers in the drawings are:

the outer layer of the cladding 1 is,

a heating core layer 2, a positive electrode connecting part 2-1, a negative electrode connecting part 2-2, a heating part 2-3, an inner heating part 2-31, an inner ring heating part 2-32, an outer ring heating part 2-33,

the device comprises an electric connection sheet assembly 3, a positive electrode electric connection sheet 3-1 and a negative electrode electric connection sheet 3-2.

Detailed Description

In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is provided in connection with the accompanying drawings. The description of the position of the utility model is carried out according to the position shown in fig. 1, namely the left and right directions about the upper and lower that fig. 1 is shown is the back left and right direction of description, and the party that fig. 1 faced is the top, and the party that deviates from fig. 1 is the below.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.

It should be understood that the terms "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on the positional relationships illustrated in the drawings, and are used only for convenience in describing the present invention or simplifying the description, but do not indicate that a particular orientation must be provided.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

(example 1)

Referring to fig. 1, the electric heating film of this embodiment 1 includes an outer cladding layer 1, a heat generating core layer 2, and an electric connection sheet assembly 3.

The coating outer layer 1 is composed of an upper surface layer and a bottom layer, the upper surface layer and the bottom layer are both made of PET (PET is an abbreviation of Polyethylene terephthalate, PET or PETP for short) or PI (PI is an abbreviation of Polyimide, PI is Polyimide in Chinese, and is an aromatic heterocyclic polymer compound with a molecular structure containing imide chain links) or epoxy resin materials, and the Polyimide has better high-temperature resistance when being adopted, and is suitable for occasions with higher fireproof requirements. The corresponding part of the upper surface layer is fixed on the bottom layer and the heating core layer 2 from top to bottom through hot-melt adhesive bonding. The heat-generating core layer 2 is coated between the upper and lower layers of the clad outer layer 1.

The heating core layer 2 is formed by laying conductive heating strips made of metal materials, the conductive heating strips are made of metal foils which are glued and compounded on the bottom layer of the coating outer layer 1 through a printing and etching method, and the conductive heating strips of the embodiment are made of aluminum foils which pass throughThe conductive heating strip is manufactured by a printing and etching method, and the head and the tail of the conductive heating strip are respectively provided with a positive electrode connecting part 2-1 and a negative electrode connecting part 2-2. The part between the positive electrode connecting part 2-1 and the negative electrode connecting part 2-2 of the conductive heating bar is a heating part 2-3. All conductive sectional areas of the heat generating portions 2-3 are the same, being 0.001mm to 0.2mm, the present embodiment is 0.02 mm. The distance between the adjacent parallel parts of the heating parts 2-3 is gradually reduced from inside to outside. The specific method comprises the following steps: according to the formula P = I R, the series state currents are the same, and the smaller the conductive sectional area of the metal strip is, the larger the resistance is, and the larger the power is;

the heat Q is proportional to the electric power P, to time, and inversely proportional to the square of the radius, the coefficient k of the formula being related to the heat dissipation condition, k ranging from 0 to 1. According to the electric heating film service environment and the heated surface (floor) heat transfer and heat dissipation conditions, the power density distribution of the electric heating film is adjusted (by adjusting the distance or the conductive sectional area of the heating part, the distance is adjusted in the embodiment), when the heat transfer and heat dissipation are fast, the temperature of the heated surface presents larger gradient, the central temperature of the electric heating film is high, the peripheral temperature of the electric heating film is low, and the power density in the middle of the electric heating film is reduced by improving the peripheral power density of the electric heating film, so that the temperature of the heated surface is more uniform.

The electrical connection sheet assembly 3 comprises a positive electrical connection sheet 3-1 and a negative electrical connection sheet 3-2. The positive electrode electric connection sheet 3-1 and the negative electrode electric connection sheet 3-2 are both made of metal conductive materials, in this embodiment, copper materials. The positive electrode electric connection sheet 3-1 is fixedly connected and electrically connected to the part of the positive electrode connection part 2-1 covered by the outer covering layer 1 by adopting puncture crimping. The negative electrode electric connecting piece 3-2 is fixedly connected by adopting puncture crimping and is electrically connected on the part of the outer coating layer 1 coating the negative electrode connecting part 2-2.

The utility model discloses a can set up in floor or wallboard during the use of electric heat membrane, anodal electricity connection piece 3-1 and negative pole electricity connection piece 3-2 are connected through corresponding wire and the anodal and the negative pole electricity of power, and the portion that anodal electricity connection piece 3-1 and corresponding wire electricity are connected and the portion that negative pole electricity connection piece 3-2 and corresponding wire electricity are connected seal the processing through waterproof sealed glue.

(example 2)

Referring to fig. 2, the rest of the present embodiment is the same as embodiment 1, except that: the conductive sectional areas of the heating portions 2-3 are gradually reduced from inside to outside, and according to the formula P = I R, the series state currents are the same, and the smaller the conductive sectional area of the metal strip per unit length is, the larger the resistance is, and the larger the power is. The distance between the adjacent parts of the heating parts 2-3 which are parallel to each other is gradually increased from inside to outside, the compensation required to be increased at the periphery and the heating power required to be reduced at the central part are determined according to the temperature difference between the periphery and the center of the electric heating film in the working state, and the surface temperature of the electric heating film is more balanced under the condition that the whole power is not changed.

(example 3)

Referring to fig. 3, the rest of the present embodiment is the same as embodiment 1, except that: the heat generating parts 2-3 include inner heat generating parts 2-31, inner ring heat generating parts 2-32, and outer ring heat generating parts 2-33. The inner heating part 2-31, the inner ring heating part 2-32 and the outer ring heating part 2-33 are connected in parallel on the positive electrode connecting part 2-1 and the negative electrode connecting part 2-2. The inner heating part 2-31, the inner ring heating part 2-32 and the outer ring heating part 2-33 are arranged in sequence from inside to outside, the inner ring heating part 2-32 is arranged around the inner heating part 2-31, and the outer ring heating part 2-33 is arranged around the inner ring heating part 2-32. The conductive cross-sectional areas of the inner heating portions 2-31, the inner ring heating portions 2-32 and the outer ring heating portions 2-33 are gradually increased, and according to the formula P = I R, the series state currents are the same, and the larger the conductive cross-sectional area of the metal bar is, the smaller the resistance is, and the smaller the power is.

(example 4)

Referring to fig. 4, the rest of the present embodiment is the same as embodiment 2, except that: the arrangement density of the heating parts is increased at the four corners, so that the power density of the four corners is increased, the improvement of the state that the temperature is lower due to the fact that the corners are fast to dissipate heat is facilitated, and the overall temperature of the electric heating film is more balanced.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. An electrothermal film, its characterized in that: comprises an outer cladding layer, a heating core layer and an electric connection sheet assembly; the heating core layer is coated by the coating outer layer and is positioned between the upper surface layer and the bottom layer of the coating outer layer; the heating core layer is formed by laying conductive heating strips, the head and the tail of each conductive heating strip are respectively provided with a positive electrode connecting part and a negative electrode connecting part, and the part between the positive electrode connecting part and the negative electrode connecting part of each conductive heating strip is a heating part; the distance between the adjacent parallel parts of the heating parts is gradually reduced from inside to outside; the electric connection sheet assembly comprises a positive electric connection sheet and a negative electric connection sheet; the positive electrode electric connecting sheet and the negative electrode electric connecting sheet are both made of metal conductive materials; the positive electrode electric connecting sheet is fixedly connected and electrically connected on the outer coating layer and is electrically connected on the positive electrode connecting part; the negative electrode electric connection sheet is fixedly connected to the outer cladding layer and is electrically connected to the negative electrode connection part.

2. The electrothermal film according to claim 1, wherein: the conductive sectional area of the heating part is gradually reduced from inside to outside.

3. The electrothermal film according to claim 1, wherein: the heating part comprises an inner heating part, an inner ring heating part and an outer ring heating part; the inner heating part, the inner ring heating part and the outer ring heating part are connected in parallel on the positive electrode connecting part and the negative electrode connecting part; the inner heating part, the inner ring heating part and the outer ring heating part are sequentially arranged from inside to outside, the inner ring heating part is arranged around the inner heating part, and the outer ring heating part is arranged around the inner ring heating part; the conductive cross-sectional areas of the inner heating part, the inner ring heating part and the outer ring heating part are gradually increased.

4. An electrothermal film according to any one of claims 1 to 3, wherein: the conductive heating strip of the heating core layer is made of metal materials, and the conductive heating strip is made of metal foils compounded on the bottom layer of the cladding outer layer through a printing etching method.

5. An electrothermal film, its characterized in that: comprises an outer cladding layer, a heating core layer and an electric connection sheet assembly; the heating core layer is coated by the coating outer layer and is positioned between the upper surface layer and the bottom layer of the coating outer layer; the heating core layer is formed by laying conductive heating strips, the head and the tail of each conductive heating strip are respectively provided with a positive electrode connecting part and a negative electrode connecting part, and the part between the positive electrode connecting part and the negative electrode connecting part of each conductive heating strip is a heating part; the distance between the adjacent parallel parts of the heating parts is gradually increased from inside to outside, and the conductive sectional area of the heating parts is gradually reduced from inside to outside; the electric connection sheet assembly comprises a positive electric connection sheet and a negative electric connection sheet; the positive electrode electric connecting sheet and the negative electrode electric connecting sheet are both made of metal conductive materials; the positive electrode electric connecting sheet is fixedly connected and electrically connected on the outer coating layer and is electrically connected on the positive electrode connecting part; the negative electrode electric connection sheet is fixedly connected to the outer cladding layer and is electrically connected to the negative electrode connection part.