CN111194102A - Electric heating plate capable of generating heat uniformly, preparation method thereof and thick film heating element - Google Patents
Electric heating plate capable of generating heat uniformly, preparation method thereof and thick film heating element Download PDFInfo
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- CN111194102A CN111194102A CN201911393322.6A CN201911393322A CN111194102A CN 111194102 A CN111194102 A CN 111194102A CN 201911393322 A CN201911393322 A CN 201911393322A CN 111194102 A CN111194102 A CN 111194102A
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- 238000005485 electric heating Methods 0.000 title claims abstract description 69
- 238000010438 heat treatment Methods 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 238000005507 spraying Methods 0.000 claims abstract description 29
- 239000000758 substrate Substances 0.000 claims abstract description 29
- 239000004020 conductor Substances 0.000 claims abstract description 22
- 230000003313 weakening effect Effects 0.000 claims abstract description 10
- 238000005245 sintering Methods 0.000 claims description 18
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 14
- 229910052709 silver Inorganic materials 0.000 claims description 14
- 239000004332 silver Substances 0.000 claims description 14
- 238000007650 screen-printing Methods 0.000 claims description 9
- 230000002829 reductive effect Effects 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- 238000007639 printing Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 230000020169 heat generation Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 2
- 230000017525 heat dissipation Effects 0.000 abstract description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 13
- 239000010935 stainless steel Substances 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 11
- 238000001931 thermography Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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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
Abstract
The invention provides an electric heating plate with uniform heating, which comprises a substrate, an insulating medium layer, a conductor layer and a resistance layer which are contacted in sequence; the conductor layer consists of positive electrode strips and negative electrode strips, and the positive electrode strips and the negative electrode strips are mutually staggered to divide the electric heating plate into two or more sub-regions; the positive electrode strips and the negative electrode strips are gradually narrowed along the direction of weakening current flowing through the electrode strips; the resistance layer uses the center of the sub-region as a circle center, and the resistance layer is gradually thickened from the circle center to the edge. The width of the electrode strip is designed to be changed in a gradient manner, so that the heating power of the electrode strip is the same everywhere, and good temperature uniformity is realized. The invention takes the center of the subregion as the center of a circle, and the spraying flow is increased from the center of a circle to the edge one by one, and the heat compensation is formed by the quick heat dissipation of the edge. The problem of uneven temperature is obviously improved. The invention also provides a preparation method of the electric heating plate with uniform heating and a thick film heating element.
Description
Technical Field
The invention belongs to the technical field of heating devices, and particularly relates to an electric heating plate capable of generating heat uniformly, a preparation method of the electric heating plate and a thick film heating element.
Background
The thick film heating is particularly characterized in that the thick film heating element is obtained by printing insulating medium, resistor, conductor, protective glaze and other sizing agents on a stainless steel substrate by adopting a screen printing technology and respectively realizing the functions through high-temperature sintering.
Taking the thick-film electric heating tube as an example, the thick-film electric heating tube mainly comprises a stainless steel tube substrate, an inner insulating medium layer, a conductor layer, a resistance heating layer and an outer insulating medium layer from inside to outside, water flows through the stainless steel tube, wherein the thickness of the inner insulating medium layer is about 100 micrometers, and as the heat conduction distance from the resistance heating layer to the stainless steel substrate is short, the thermal resistance is small, and the thermal response speed is high.
Since the water flow is heated immediately when passing through the stainless steel tube, the heating power density of the fixed-size stainless steel tube heating element is required to be high. Under the condition that the sheet resistance of the resistance layer is constant, in order to realize high power density, a plurality of electrode strips are required to be designed to divide the resistance layer into a plurality of areas, so that multi-area parallel heating is realized.
In a common thick film heating element in the market, when the thick film heating element is electrified and heated, the current from the resistance layer gathered at different parts of the electrode strip is not uniform in magnitude, so that the heating temperature at different parts of the electrode strip is not uniform. Thus, a temperature non-uniform zone is formed at the electrode strips as a whole of the thick film heating element.
Even if temperature unevenness caused by a plurality of electrode strips is not considered, the general planar heating element has the problems that the four sides of the heating surface are low in temperature, and the center of the heating surface is high in temperature. This is because the heat exchange between the four sides of the heat generating surface and the surrounding environment is faster and the heat dissipation is also faster. In order to ensure the heating power of a common electric heating plate, only a heated body with the size obviously smaller than the in-plane size of the electric heating plate can be placed in the center of the heating surface of the electric heating plate. Thus, the four sides of the electric heating plate are wasted from the perspective of energy and material utilization.
Disclosure of Invention
The invention aims to provide an electric heating plate with uniform heating, a preparation method thereof and a thick film heating element.
The invention provides an electric heating plate with uniform heating, which comprises a substrate, an insulating medium layer, a conductor layer and a resistance layer which are contacted in sequence;
the conductor layer consists of positive electrode strips and negative electrode strips, and the positive electrode strips and the negative electrode strips are mutually staggered to divide the electric heating plate into two or more sub-regions;
the positive electrode strips and the negative electrode strips which are in contact with the resistance layer are gradually narrowed along the direction of weakening current flowing through the electrode strips;
the resistance layer takes the center of each sub-region as a circle center, and the resistance layer is gradually thickened from the circle center to the edge of each sub-region.
Preferably, when the current flowing through the electrode strip is less than 5A, the width of the electrode strip is more than or equal to 1mm and less than or equal to 3 mm;
when the current flowing through the current bar is more than or equal to 5A and less than 10A, the width of the electrode bar is more than 3mm and less than or equal to 5 mm;
when the current flowing through the current bar is more than or equal to 10A and less than 20A, the width of the electrode bar is more than or equal to 5mm and less than 10 mm.
Preferably, the positive electrode strip and the negative electrode strip divide the electrode plate into 2-10 sub-regions.
Preferably, the thickness of the conductor layer is 3 to 20 μm.
Preferably, the thickness of the resistance layer is 3 to 60 μm.
The invention provides a preparation method of an electric heating plate with uniform heating, which comprises the following steps:
A) screen printing insulating medium slurry on the surface of a substrate, and sintering for 5-20 min at 800-950 ℃ to obtain an insulating medium layer;
B) printing a positive electrode and a negative electrode on the insulating medium layer by using silver paste in a screen printing manner, and sintering at 700-900 ℃ for 5-20 min to obtain a conductor layer;
the silver paste electrode is gradually narrowed along the direction of weakening current flowing through the electrode strips; the positive electrode strips and the negative electrode strips are mutually staggered, and the electric heating plate is divided into two or more than two sub-areas;
C) and (3) spraying resistance slurry on the surface of the conductor layer on the edge of the sub-area circle by taking the center of each sub-area as the center of circle and taking 1-10 cm as an interval, wherein the spraying speed is reduced circle by circle, and sintering is carried out for 5-20 min at 500-650 ℃ after the spraying is finished, so as to obtain the electric heating plate with uniform heating.
Preferably, the spraying speed of the innermost ring is 400-600 mm/s; and the spraying speed decreases gradually from the center of the sub-area to the edge of the sub-area at a speed of 20-50 mm/s per circle.
Preferably, the mass fraction of the resistance paste is 0.1-1%.
The invention provides a thick film heating element made of the above-described electric hot plate with uniform heating.
The invention provides an electric heating plate with uniform heating, which comprises a substrate, an insulating medium layer, a conductor layer and a resistance layer which are contacted in sequence; the conductor layer consists of positive electrode strips and negative electrode strips, and the positive electrode strips and the negative electrode strips are mutually staggered to divide the electric heating plate into two or more sub-regions; the positive electrode strips and the negative electrode strips are gradually narrowed along the direction of weakening current flowing through the electrode strips; the resistance layer takes the center of each sub-region as a circle center, and the resistance layer is gradually thickened from the circle center to the edge of each sub-region. The present invention designs the width of the electrode strips to be graded such that along the gradient direction the sheet resistance of the electrode strips is graded as well. The calculation and design can realize that the gradient change current from the resistance layer, which is gathered at different parts of the electrode strip, is multiplied by the gradient change section resistance of the electrode strip, and the current and the section resistance are equal everywhere. Thus, the heating power of the electrode strips is made to be the same everywhere, and good temperature uniformity is achieved. In addition, the resistance layer is made by adopting a method of spraying resistance paste instead of screen printing the resistance paste, the heating center of the electric heating plate is taken as the center of a circle, the flow of the sprayed resistance paste is increased from the center of the circle to the edge of the electric heating plate, and thus, the closer to the four edges (the edge of the substrate) of the electric heating plate, the thicker the resistance layer is, the smaller the resistance is, the higher the heating power is, and the faster the heat dissipation of the four edges of the electric heating plate is formed to compensate the heat. The problem of temperature non-uniformity is also significantly improved.
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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of the spraying of a resistive layer in one sub-area of example 1 of the present invention;
FIG. 2 is a schematic structural view of an electric heating plate according to embodiment 1 of the present invention;
wherein, 1 is a stainless steel substrate, 2 is an insulating medium layer, 3 and 4 are electrode strips, and 5 is a resistance layer;
FIG. 3 is an infrared thermal imaging diagram of an electric hot plate according to embodiment 1 of the present invention;
FIG. 4 is a schematic structural view of an electric heating plate in comparative example 1 of the present invention;
wherein, 1 is a stainless steel substrate, 2 is an insulating medium layer, 3 and 4 are electrode strips, and 5 is a resistance layer;
FIG. 5 is an infrared thermal image of an electric hot plate in comparative example 1 of the present invention;
FIG. 6 is a schematic structural view of an electric heating plate in comparative example 2 of the present invention;
wherein, 1 is a stainless steel substrate, 2 is an insulating medium layer, 3 and 4 are electrode strips, and 5 is a resistance layer;
FIG. 7 is an infrared thermal image of an electric hot plate in comparative example 2 of the present invention;
FIG. 8 is a schematic structural view of an electric heating plate according to embodiment 2 of the present invention;
wherein, 1 is a stainless steel substrate, 2 is an insulating medium layer, 3 and 4 are electrode strips, and 5 is a resistance layer;
fig. 9 is an infrared thermal imaging diagram of an electric hot plate in embodiment 2 of the present invention.
Detailed Description
The invention provides an electric heating plate with uniform heating, which comprises a substrate, an insulating medium layer, a conductor layer and a resistance layer which are contacted in sequence;
the conductor layer consists of positive electrode strips and negative electrode strips, and the positive electrode strips and the negative electrode strips are mutually staggered to divide the electric heating plate into two or more sub-regions;
the positive electrode strips and the negative electrode strips are gradually narrowed along the direction of weakening current flowing through the electrode strips;
the resistance layer takes the center of each sub-region as a circle center, and the resistance layer is gradually thickened from the circle center to the edge of each sub-region.
In the invention, the substrate is preferably a stainless steel substrate, the thickness of the substrate is preferably 0.5-3 mm, and more preferably 1-2 mm, the size of the substrate is not particularly limited, and the substrate with a proper size can be selected according to actual requirements.
In the invention, the insulating medium layer is made of a material commonly used in the field, and no special requirement is made in the invention, for example, the insulating medium layer mainly comprises glass powder, and the thickness of the insulating medium layer is preferably 40-80 μm, more preferably 50-70 μm, and most preferably 60 μm.
In the invention, the conductor layer is composed of electrode strips, the electrode strips are divided into positive electrode strips and negative electrode strips, the positive electrode strips and the negative electrode strips are distributed in a staggered manner, and the electric heating plate is divided into two or more sub-regions, namely, one end of each sub-region is a positive electrode strip, and the other end of each sub-region is a negative electrode strip.
In the invention, the current is attenuated to a certain degree when flowing through the electrode strips, and the positive electrode strip and the negative electrode strip are gradually narrowed along the current attenuation direction, namely, the starting end of the electrode strip is widest and the tail end of the electrode strip is narrowest along the current attenuation direction.
In the invention, when the current flowing through the electrode strip is less than 5A, the width of the electrode strip is more than or equal to 1mm and less than or equal to 3 mm; when the current flowing through the current bar is more than or equal to 5A and less than 10A, the width of the electrode bar is more than 3mm and less than or equal to 5 mm; when the current flowing through the current bar is more than or equal to 10A and less than 20A, the width of the electrode bar is more than or equal to 5mm and less than 10 mm. The electrode strips are uniformly changed from wide to narrow within the width range.
For the situation that the current flowing through the electrode strip is larger than or equal to 20A, the temperature can be raised to 400 ℃ within 2 seconds due to the too fast heating rate of the electric heating plate, and the temperature regulation is not very favorable and is not considered.
In the present invention, the widths of the plurality of electrode strips may be the same or different, and in the present invention, the widths and the width variations of all the electrode strips are preferably set to be the same, and further, the sizes and the shapes of the sub-regions are set to be the same, that is, the positive electrode strips and the negative electrode strips are uniformly distributed on the surface of the insulating dielectric layer.
The number of the positive electrode strips and the negative electrode strips is not particularly limited, the positive electrode strips and the negative electrode strips are preferably staggered with each other, so that the whole area of the substrate is divided into two or more sub-areas, preferably 2-10 sub-areas, specifically, in the embodiment of the invention, 2, 3, 4, 5, 6, 7, 8, 9 or 10 sub-areas;
in the invention, the resistance layer takes the center of each subregion as a circle center, and the thickness of the resistance layer is gradually increased from the circle center to the edge of each subregion.
In the invention, the thickness range of the resistance layer is 3-60 μm, more preferably 5-50 μm, and most preferably 10-40 μm; the resistance layer is uniformly changed from thin to thick in the temperature range, in the invention, the resistance layer takes the center of each subregion as a circle center and 1-10 cm as an interval, and gradually thickens towards the edge of each subregion circle by circle, specifically, in the embodiment of the invention, the thickness of the innermost circle can be 3 μm, the thickness of the innermost circle can be 5cm as an interval, and the thickness of each circle is 3 μm.
The invention also provides a preparation method of the electric heating plate with uniform heating, which comprises the following steps:
A) screen printing insulating medium slurry on the surface of a substrate, and sintering for 5-20 min at 800-950 ℃ to obtain an insulating medium layer;
B) printing a positive electrode and a negative electrode on the insulating medium layer by using silver paste in a screen printing manner, and sintering at 700-900 ℃ for 5-20 min to obtain a conductor layer;
the silver paste electrode is gradually narrowed along the direction of weakening current flowing through the electrode strips; the positive electrode strips and the negative electrode strips are mutually staggered, and the electric heating plate is divided into two or more than two sub-areas;
C) and (3) spraying resistance slurry on the surface of the conductor layer on the edge of the sub-area circle by taking the center of each sub-area as the center of circle and taking 1-10 cm as an interval, wherein the spraying speed is reduced circle by circle, and sintering is carried out for 5-20 min at 500-650 ℃ after the spraying is finished, so as to obtain the electric heating plate with uniform heating.
In the invention, the sintering temperature of the insulating dielectric layer is preferably 800-950 ℃, and more preferably 850-800 ℃; the sintering time of the insulating medium layer is preferably 5-20 min, and more preferably 10-15 min.
The invention preferably repeats the steps, and the insulating medium slurry is respectively silk-screened and sintered twice to obtain the insulating medium layer.
The silver paste electrode is gradually narrowed along the direction of weakening the current flowing through the electrode strips, and the specific width range and the change rule are consistent with the width and the change of the electrode, which are not described again.
In the invention, the components of the silver paste are silver paste for preparing the electrode, which is commonly used by the technicians in the field, and the sintering temperature of the electrode is preferably 700-900 ℃, more preferably 750-850 ℃, and most preferably 800 ℃; the sintering time of the electrode is preferably 5-20 min, and more preferably 10-15 min.
The resistance layer is preferably prepared by spraying, in the invention, the resistance paste comprises the components commonly used by those skilled in the art, and in the invention, the mass fraction of the resistance paste is preferably 0.1-1%, more preferably 0.3-0.8%, and most preferably 0.5-0.6%.
The invention preferably adopts an ultrasonic spraying machine, takes the center of the subregion as the starting point of a circle center and takes 1-10 cm as an interval, preferably 3-8 cm, more preferably 5-6 cm as an interval, and sprays the edge of the subregion circle by circle, and the spraying wiring speed is reduced from the circle center to the edge of the substrate circle by circle, so that the resistance layer prepared by spraying is thickened from circle to circle. The routing speed of the innermost circle (namely, the circle closest to the circle center) is preferably 400-600 mm/s, more preferably 500-550 mm/s, and the routing speed of spraying is preferably decreased progressively per circle at the speed of 20-50 mm/s every circle, more preferably 30-40 mm/s.
After the spraying is finished, the sprayed resistance layer is sintered, wherein the sintering temperature is preferably 500-650 ℃, more preferably 550-600 ℃, and most preferably 580 ℃; the sintering time is preferably 5-20 min, and more preferably 10-15 min.
The invention also provides a thick film heating element prepared from the electric heating plate with uniform heating. For example, an outer insulating layer is compounded on the surface of the resistance layer to prepare a thick-film electrothermal tube.
The invention provides an electric heating plate with uniform heating, which comprises a substrate, an insulating medium layer, a conductor layer and a resistance layer which are contacted in sequence; the conductor layer consists of positive electrode strips and negative electrode strips, and the positive electrode strips and the negative electrode strips are mutually staggered to divide the electric heating plate into two or more sub-regions; the positive electrode strips and the negative electrode strips are gradually narrowed along the direction of weakening current flowing through the electrode strips; the resistance layer takes the center of the electric heating plate as a circle center, and the resistance layer is gradually thickened from the circle center to the edge of the electric heating plate. The present invention designs the width of the electrode strips to be graded such that along the gradient direction the sheet resistance of the electrode strips is graded as well. The calculation and design can realize that the gradient change current from the resistance layer, which is gathered at different parts of the electrode strip, is multiplied by the gradient change section resistance of the electrode strip, and the current and the section resistance are equal everywhere. Thus, the heating power of the electrode strips is made to be the same everywhere, and good temperature uniformity is achieved. In addition, the resistance layer is made by adopting a method of spraying resistance paste instead of screen printing the resistance paste, the heating center of the electric heating plate is taken as the center of a circle, the flow of the sprayed resistance paste is increased from the center of the circle to the edge of the electric heating plate, and thus, the closer to the four edges (the edge of the substrate) of the electric heating plate, the thicker the resistance layer is, the smaller the resistance is, the higher the heating power is, and the faster the heat dissipation of the four edges of the electric heating plate is formed to compensate the heat. The problem of temperature non-uniformity is also significantly improved.
In order to further illustrate the present invention, the following examples are provided to describe the electric heating plate, the method for manufacturing the same, and the thick film heating element in detail, but should not be construed as limiting the scope of the present invention.
Example 1
290 x 296mm of insulating medium paste was printed on a 300 x 300mm sized stainless steel substrate 1 using a screen printer and sintered at a peak at 880 c for 10 minutes in the atmosphere. And then, respectively printing and sintering the dielectric paste for two times to obtain the insulating dielectric layer 2. Silver paste electrodes 3 and 4 are printed on the dielectric layer 2, wherein the width of the electrode 3 is uniform and is 10mm, the width of the electrode 4 is changed in a gradient mode, the widest position is 10mm, and the narrowest position is 5 mm. The silver paste electrodes 3, 4 need to be sintered in the atmosphere at a peak of 800 ℃ for 10 minutes. And then, preparing resistance paste with the mass fraction of 0.5%, and spraying the resistance paste circle by circle outwards by using an ultrasonic spraying machine with the center of the substrate as a starting point and 5cm as an interval, wherein as shown in fig. 1, the spraying wiring speed is reduced from inside to outside circle by circle, the wiring speed of the innermost circle is 500mm/s, and then the speed is reduced by 30mm/s every circle outwards. The resistance paste was sintered in the atmosphere at a peak value of 580 ℃ for 10 minutes to obtain the resistance layer 5. Thus, a thick film electric heating plate having the structure shown in FIG. 2 was obtained.
The infrared thermal imaging test was performed on the electric heating plate prepared in example 1, and the result is shown in fig. 3, where fig. 3 is an infrared thermal imaging diagram of the electric heating plate in example 1 of the present invention.
Comparative example 1
An electric heating plate was manufactured according to the manufacturing method of example 1, except that the wire speed of the spray coating in comparative example 1 was maintained to be uniform, and thus the thickness of the resistive layer was uniform, as shown in fig. 4, fig. 4 is a schematic structural view of the electric heating plate of comparative example 1 according to the present invention, and fig. 5 is an infrared thermal imaging view of the electric heating plate of comparative example 1 according to the present invention.
As can be seen from fig. 3 and 5, the electric heating plate in example 1 generates uniform heat throughout the whole panel without local high heat or local low temperature, while the resistance layer in fig. 5 is uniform, and the edge temperature of the two sub-regions of the electric heating plate is obviously lower than the central temperature, and the heat generation is not uniform.
Comparative example 2
An electric heating plate having a structure as shown in fig. 6 was manufactured in the same manner as in example 1, i.e., the electrode strips in comparative example 2 were uniform in thickness, and the rest was the same as in example.
FIG. 7 is an infrared thermal image of the electric heating plate of comparative example 2 of the present invention, and it can be seen from FIG. 7 that the temperature non-uniform region is formed at the electrode stripes having uniform thickness.
Example 2
A 215 x 185mm slurry of insulating medium was printed on a 230 x 200mm sized stainless steel substrate 1 using a screen printer and sintered at a peak at 880 ℃ for 10 minutes in an atmosphere. And then, respectively printing and sintering the dielectric paste for two times to obtain the insulating dielectric layer 2.
3 silver paste positive electrodes 3 and 4 silver paste negative electrodes 4 are printed on the dielectric layer 2, the width of the part, in contact with the resistance layer, of the electrodes 3 and 4 is changed in a gradient mode, the widest part is 3mm, and the narrowest part is 1 mm. The silver paste electrodes 3, 4 need to be sintered in the atmosphere at a peak of 800 ℃ for 10 minutes.
And then, preparing resistance paste with the mass fraction of 0.5%, spraying the resistance paste circle by circle outwards by using an ultrasonic spraying machine with the center of the substrate as a starting point and 5cm as an interval, wherein the sprayed wiring speed is reduced from inside to outside circle by circle, the wiring speed of the innermost circle is 500mm/s, and then, the speed is reduced by 30mm/s every outward circle. The resistance paste was sintered in the atmosphere at a peak value of 580 ℃ for 10 minutes to obtain the resistance layer 5. A thick film electric heating plate having the structure shown in fig. 8 was obtained.
The infrared thermal imaging test was performed on the electric heating plate prepared in example 2, and the result is shown in fig. 9, where fig. 9 is an infrared thermal imaging diagram of the electric heating plate in example 2 of the present invention. As can be seen from fig. 9, the thick film hotplate of example 2 generates heat uniformly as a whole.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. An electric heating plate with uniform heating comprises a substrate, an insulating medium layer, a conductor layer and a resistance layer which are contacted in sequence;
the conductor layer consists of positive electrode strips and negative electrode strips, and the positive electrode strips and the negative electrode strips are mutually staggered to divide the electric heating plate into two or more sub-regions;
the positive electrode strips and the negative electrode strips which are in contact with the resistance layer are gradually narrowed along the direction of weakening current flowing through the electrode strips;
the resistance layer takes the center of each sub-region as a circle center, and the resistance layer is gradually thickened from the circle center to the edge of each sub-region.
2. The electric hot plate of claim 1, wherein when the current flowing through the electrode strips is less than 5A, the width of the electrode strips is not less than 1mm and not more than 3 mm;
when the current flowing through the current bar is more than or equal to 5A and less than 10A, the width of the electrode bar is more than 3mm and less than or equal to 5 mm;
when the current flowing through the current bar is more than or equal to 10A and less than 20A, the width of the electrode bar is more than or equal to 5mm and less than 10 mm.
3. The electric heating plate with uniform heat generation of claim 1, wherein the positive electrode strip and the negative electrode strip divide the electrode plate into 2-10 sub-regions.
4. The electric heating plate of claim 1, wherein the thickness of the conductive layer is 3 to 20 μm.
5. The electric heating plate of claim 1, wherein the resistive layer has a thickness of 3 to 60 μm.
6. A method for preparing an electric heating plate with uniform heating comprises the following steps:
A) screen printing insulating medium slurry on the surface of a substrate, and sintering for 5-20 min at 800-950 ℃ to obtain an insulating medium layer;
B) printing a positive electrode and a negative electrode on the insulating medium layer by using silver paste in a screen printing manner, and sintering at 700-900 ℃ for 5-20 min to obtain a conductor layer;
the silver paste electrode is gradually narrowed along the direction of weakening current flowing through the electrode strips; the positive electrode strips and the negative electrode strips are mutually staggered, and the electric heating plate is divided into two or more than two sub-areas;
C) and (3) spraying resistance slurry on the surface of the conductor layer on the edge of the sub-area circle by taking the center of each sub-area as the center of circle and taking 1-10 cm as an interval, wherein the spraying speed is reduced circle by circle, and sintering is carried out for 5-20 min at 500-650 ℃ after the spraying is finished, so as to obtain the electric heating plate with uniform heating.
7. The manufacturing method according to claim 6, wherein the spraying speed of the innermost ring is 400 to 600 mm/s; and the spraying speed decreases gradually from the center of the sub-area to the edge of the sub-area at a speed of 20-50 mm/s per circle.
8. The method according to claim 6, wherein the mass fraction of the resistor paste is 0.1 to 1%.
9. A thick film heating element made of the electric heating plate with uniform heat generation of any one of claims 1 to 5 or the electric heating plate with uniform heat generation made by the preparation method of any one of claims 6 to 8.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115427150A (en) * | 2021-03-12 | 2022-12-02 | 京东方科技集团股份有限公司 | Microfluidic substrate, microfluidic chip and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104883760A (en) * | 2015-04-24 | 2015-09-02 | 冯冠平 | Low-voltage transparent electrothermal film |
| CN105517215A (en) * | 2015-04-24 | 2016-04-20 | 冯冠平 | Low-voltage transparent electrothermal film, preparation process thereof, high-temperature electrothermal sheet and preparation process thereof |
| CN107660006A (en) * | 2016-07-25 | 2018-02-02 | 中国科学院成都有机化学有限公司 | A kind of low-voltage flexible electrothermal membrane and preparation method thereof |
| CN211656413U (en) * | 2019-12-30 | 2020-10-09 | 宁波柔碳电子科技有限公司 | Electric heating plate capable of generating heat uniformly and thick film heating element |
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2019
- 2019-12-30 CN CN201911393322.6A patent/CN111194102A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104883760A (en) * | 2015-04-24 | 2015-09-02 | 冯冠平 | Low-voltage transparent electrothermal film |
| CN105517215A (en) * | 2015-04-24 | 2016-04-20 | 冯冠平 | Low-voltage transparent electrothermal film, preparation process thereof, high-temperature electrothermal sheet and preparation process thereof |
| CN107660006A (en) * | 2016-07-25 | 2018-02-02 | 中国科学院成都有机化学有限公司 | A kind of low-voltage flexible electrothermal membrane and preparation method thereof |
| CN211656413U (en) * | 2019-12-30 | 2020-10-09 | 宁波柔碳电子科技有限公司 | Electric heating plate capable of generating heat uniformly and thick film heating element |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115427150A (en) * | 2021-03-12 | 2022-12-02 | 京东方科技集团股份有限公司 | Microfluidic substrate, microfluidic chip and manufacturing method thereof |
| CN115427150B (en) * | 2021-03-12 | 2024-04-02 | 京东方科技集团股份有限公司 | Microfluidic substrate, microfluidic chip and manufacturing method thereof |
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