CN102256394A - Electric heating element and manufacturing method thereof - Google Patents
Electric heating element and manufacturing method thereof Download PDFInfo
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- CN102256394A CN102256394A CN201110109269XA CN201110109269A CN102256394A CN 102256394 A CN102256394 A CN 102256394A CN 201110109269X A CN201110109269X A CN 201110109269XA CN 201110109269 A CN201110109269 A CN 201110109269A CN 102256394 A CN102256394 A CN 102256394A
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Abstract
The invention relates to an electric heating element. The electric heating element comprises an electric heating body, wherein the electric heating body comprises a heat and electricity conducting positive electrode, a heat and electricity conducting negative electrode, at least two positive temperature coefficient (PTC) thermistors, a heat-conducting insulating layer, an ornamental external wrapping layer, a direct-current power supply and an overcurrent, overtemperature and overvoltage protection component; the PTC thermistors are positioned between the heat and electricity conducting positive electrode and the heat and electricity conducting negative electrode and are electrically connected with the heat and electricity conducting positive and negative electrodes respectively; the heat and electricity conducting positive and negative electrodes, and the PTC thermistors form a net structure; preferably, the net structure is a polygonal net structure; the heat-conducting insulating layer wraps the electric heating body; the ornamental external wrapping layer wraps the heat-conducting insulating layer; the direct-current power supply penetrates through the heat-conducting insulating layer through a wire and is electrically connected with the electric heating body; and the overcurrent, overtemperature and overvoltage protection component is arranged on the wire for connecting the direct-current power supply and the electric heating body. The invention further provides a relative manufacturing method for the electric heating element. The electric heating element has unique design, skilful concept, and a simple structure, and the advantages of no electromagnetic wave radiation, constant temperature, high safety coefficient, simple manufacturing process, low cost and the like; human fatigue can be eliminated; and the electric heating element can be popularized and applied on a large scale.
Description
Technical field
The present invention relates to civil series heating device technical field, particularly the electrothermal device technical field specifically is meant a kind of electric heating element and manufacture method thereof.
Background technology
Along with people increase day by day to the consciousness of health care, and more and more to the demand of heating physiotherapy product, situation that the heating product is that a hundred flowers blossom.
Existing Related product is resistance wire or carbonaceous conductive fiber heating heating, one resistance wire heater element, it is with special, the soft cable-styled electric heating element that insulation property reach standard is dish snake shape and inweaves or sew up in the woollen blanket, evolution of heat during energising, its internal circuit is designed to series circuit or connection in series-parallel combinational circuit, and wherein any one disconnection will cause heater element to damage, and can not re-use; Driving power mostly is the 220VAC alternating current, and existing product is because of using the 220VAC AC power, and the electromagnetic field of industrial frequency (50～60HZ) electromagnetic fields bring harm to health, and it is unusual that long-term use can cause is infertile, have the fidgets, feel run-down etc.; Produce stronger electromagnetic radiation and induced electricity in the time of the work heating, it can enlarge markedly the incidence of major diseases such as tumour, sudden change.So the pregnant woman is forbidden the said goods, person in middle and old age should not use for a long time.In addition on the one hand, the said goods design overwhelming majority is used AC power, and its electric leakage hidden danger is bigger, and leakage current flows through human body, just can produce in various degree damage for people's health and interior tissue.Often as seen electric blanket electricity wound that emerges in an endless stream even the report of electrocuting the people cause that fire is numerous especially, serious harm people's safety of life and property and leak electricity.Its two carbon is led fiber heating form, and domestic existing research and development weak foundation is backward in technique, carbon fiber product quality instability, and performance is not up to standard, mainly relies on from Japan and Korea S's imported raw material, is engaged in downstream product exploitation and application, and this type of production unit cost is higher.
Therefore, need provide a kind of electric heating element, it has no electromagenetic wave radiation, constant temperature, coefficient of safety height, eliminates human-body fatigue and makes simple, low cost and other advantages.
Summary of the invention
The objective of the invention is to have overcome above-mentioned shortcoming of the prior art, a kind of electric heating element and manufacture method thereof are provided, this electric heating element design uniqueness, be skillfully constructed, simple for structure, have no electromagenetic wave radiation, constant temperature, coefficient of safety height, eliminate human-body fatigue and make simple, low cost and other advantages, be suitable for large-scale promotion application.
To achieve these goals, in a first aspect of the present invention, a kind of electric heating element is provided, be characterized in, comprise electric heating element, described electric heating element comprises heat-conductivity conducting positive pole, heat-conductivity conducting negative pole and at least two PTC thermistors, described PTC thermistor is connected with described heat-conductivity conducting negative electricity with described heat-conductivity conducting is anodal between described heat-conductivity conducting positive pole and described heat-conductivity conducting negative pole and respectively, and described heat-conductivity conducting positive pole, described heat-conductivity conducting negative pole and described PTC thermistor cloth reticulate structure.
The PTC thermistor has the excess-current excess-temperature protective feature, be that the PTC thermistor is series in the circuit, under the initial state when the circuital current value is its running current its internal impedance very little, its surface temperature is also very low, this moment, the PTC thermistor was because of the energising self-heating, cause the component body temperature to rise, and outwards dispel the heat by the PTC thermistor surface; Make it internal impedance and increase because of PTC thermistor body temperature rises, when himself heating power maintained an equal level with its heat radiation power, electric current was steady state value Ir in its circuit, and PTC thermistor gauge surface temperature also maintains steady state value at this moment; The heating power of PTC thermistor reduces with ambient temperature and increases, and raises with ambient temperature and reduces.
Anodal and the described heat-conductivity conducting negative pole of described heat-conductivity conducting can adopt any suitable material, for example is one or more alloy material thin slice of iron content, carbon, copper, aluminium, nickel, tin, chromium, manganese etc.The PTC thermistor can be any suitable PTC thermistor, for example has the semistor of overcurrent/overheat protector performance for macromolecular thermosensitive resistor, ceramic thermal resistance or other.Described PTC thermistor can adopt any suitable manner to realize with anodal the connection with described heat-conductivity conducting negative electricity of described heat-conductivity conducting respectively, for example welding.
Described heat-conductivity conducting positive pole and described heat-conductivity conducting negative pole can be provided with arbitrarily to form network structure, preferably, described heat-conductivity conducting positive pole and described heat-conductivity conducting negative pole are parallel to each other and crisscross setting, realize connecting by PTC thermistor between the two.
Described network structure can be any suitable shape, and preferably, described network structure is the polygon network structure.As quadrangle/rectangle/pentagon/hexagon or the like.
In order to reach the insulation and moisture purpose, preferably, described electric heating element also comprises the heat conductive insulating layer, and described heat conductive insulating layer coats described electric heating element.The heat conductive insulating layer can adopt any suitable material, for example heat-conducting insulated film or thermal conductive insulation glue, heat-conducting insulated film for example is high molecular polymers such as alcohol acid amido resin, silicones/rubber, acrylic resin, epoxy resin, thermal conductive insulation glue for example be alcohol acid amido resin, silicones/rubber, acrylic resin, epoxy resin etc. organic one or more.
Described heat conductive insulating layer can form by any suitable method, more preferably, institute's heat conductive insulating layer comprises heat conductive insulating layer and following heat conductive insulating layer, thereby described heat conductive insulating layer and the described following heat conductive insulating layer gone up coats the upper surface and the lower surface of described electric heating element respectively and interconnect and coat described electric heating element.
In order to make various products, more preferably, described electric heating element also comprises the decoration external packing, and described decoration external packing coats described conduction insulating barrier.Decorate external packing and can be but be not limited to electric blanket with special bed clothes, electric heating cushion with the special leatherware of adorning outward.
For fear of electromagenetic wave radiation, more preferably, described electric heating element also comprises DC power supply, is electrically connected with described electric heating element thereby described DC power supply wears described heat conductive insulating layer by lead.DC power supply can by DC power source adapter or battery for example rechargeable battery provide.
In order further to improve coefficient of safety, further, described electric heating element also comprises excess-current excess-temperature overvoltage protection parts, and described excess-current excess-temperature overvoltage protection parts are arranged in the described lead that connects described DC power supply and described electric heating element.
In second method of the present invention, a kind of manufacture method of above-mentioned electric heating element is provided, be characterized in, may further comprise the steps:
1) described PTC thermistor is placed between the anodal and described heat-conductivity conducting negative pole of described heat-conductivity conducting and be connected with described heat-conductivity conducting negative electricity with described heat-conductivity conducting is anodal respectively;
2) described heat-conductivity conducting positive pole, described heat-conductivity conducting negative pole and described PTC thermistor cloth are reticulated structure.
Preferably, described electric heating element also comprises the heat conductive insulating layer, and the manufacture method of described electric heating element also comprises step:
3) coat described electric heating element with described heat conductive insulating layer.
More preferably, described electric heating element also comprises the decoration external packing, and the manufacture method of described electric heating element also comprises step:
4) coat described conduction insulating barrier with described decoration external packing.
More preferably, described electric heating element also comprises DC power supply, and the manufacture method of described electric heating element also comprises step:
5) thus adopting lead to wear described heat conductive insulating layer is electrically connected described DC power supply with described electric heating element.
Further, described electric heating element also comprises excess-current excess-temperature overvoltage protection parts, and the manufacture method of described electric heating element also comprises step:
6) described excess-current excess-temperature overvoltage protection parts are arranged in the described lead that connects described DC power supply and described electric heating element.
Beneficial effect of the present invention specifically is:
1; electric heating element of the present invention comprises electric heating element; electric heating element comprises the heat-conductivity conducting positive pole; heat-conductivity conducting negative pole and at least two PTC thermistors; the PTC thermistor is connected with the heat-conductivity conducting negative electricity with heat-conductivity conducting is anodal between heat-conductivity conducting positive pole and heat-conductivity conducting negative pole and respectively; and heat-conductivity conducting positive pole; heat-conductivity conducting negative pole and PTC thermistor cloth reticulate structure; thereby utilize the PTC thermistor to have the excess-current excess-temperature protective feature; with parallel way the PTC thermistor is set; and cloth reticulates structure; design is unique; be skillfully constructed; simple for structure; constant temperature; the coefficient of safety height; eliminate human-body fatigue; and make simple; low cost and other advantages is suitable for large-scale promotion application.
2, electric heating element of the present invention also comprises the heat conductive insulating layer, and the heat conductive insulating layer coats electric heating element, thereby reaches the insulation and moisture purpose, and insulation voltage can not produce any potential safety hazard up to more than the 1200V, further improves fail safe.
3, the present invention adopts DC power supply, and for example low-voltage dc power supply (MAX:12VDC) has no electromagenetic wave radiation advantage.
4, the present invention adopts the PTC thermistor, and because of its monopolizing characteristic, when himself heating power and heat radiation power maintained an equal level, its surface temperature was constant, keeps constant temperature when making it this type of electric heating device work, meets the body temperature perception, and human body is not had discomfort; In addition, need not thermostat during design, thereby reduce cost and work energy consumption.
5, internal structure of the present invention adopts netted conduction mode in parallel, and heater element is not fragile, and indivedual branch line turning circuits damage does not have substantial effect to whole electric heating device, and fail safe is very high.
Description of drawings
Fig. 1 is the schematic top plan view of a specific embodiment of electric heating element of the present invention.
Fig. 2 is the local enlarged diagram of specific embodiment shown in Figure 1.
Fig. 3 is the circuit theory schematic diagram of specific embodiment shown in Figure 1.
Fig. 4 is the schematic top plan view of the electric heating element of specific embodiment shown in Figure 1.
Fig. 5 is the schematic top plan view of another specific embodiment of electric heating element of the present invention.
Embodiment
In order more to be expressly understood technology contents of the present invention, describe in detail especially exemplified by following examples.Wherein identical parts adopt identical Reference numeral.
Embodiment 1
See also shown in Fig. 1～4, what Fig. 1～4 showed is a specific embodiment of electric heating element of the present invention, is the network structure design that a kind of PTC thermistor 1 simpler and easy, common mode constitutes.
Heat-conductivity conducting anodal 2 and heat-conductivity conducting negative pole 3 fit tightly on two surfaces up and down of PTC thermistor 1, and both only are communicated with by PTC thermistor 1; Heat-conductivity conducting positive pole 2, heat-conductivity conducting negative pole 3 and a plurality of PTC thermistors 1 combinations (m capable * n row PTC thermistor 1) constitute the polygon network structure, heat-conductivity conducting anodal 2 and heat-conductivity conducting negative pole 3 is parallel to each other and crisscross setting, as can be seen from Figure 1 and Figure 4, heat-conductivity conducting positive pole 2 is positioned at the upper strata and has multiple row, heat-conductivity conducting negative pole 3 is positioned at lower floor and has multirow, formed like this circuit is equivalent to m * n PTC thermistor 1 and is connected in parallel, the initial all-in resistance of its circuit be (
R
0Be the mean value of each PTC thermistor 1 initial resistance, as shown in Figure 3), heat-conducting insulated film or thermal conductive insulation glue evenly being covered whole network structure is that electric heating element 4 surfaces form heat conductive insulating layers 5 again.
Concrete manufacture method is as follows:
(1) selects the PTC thermistor 1 of suitable Standard resistance range as required;
(2) heat conduction conducting positive pole 2, heat-conductivity conducting negative pole 3 and the PTC thermistor 1 that will select model assembles by job requirements on frock clamp, and at the suitable solder(ing) paste of assigned position drop, make heat conduction conducting positive pole 2, heat-conductivity conducting negative pole 3 be connected firmly by hot weld/Reflow Soldering/modes such as tin stove weldering then with PTC thermistor 1, form the outside framework of m * n, it is electric heating element 4, carry out subsequent job again after process drawing/Performance Detection is qualified, as shown in Figure 4;
On the basis of above-mentioned semi-finished product (network structure) can select in following two kind technologies any mode (3) thereafter:
(a) select a kind of thermal conductive insulation glue to make PTC thermistor 1 in the network structure, heat conduction conducting anodal 2 and heat-conductivity conducting negative pole 3 outer surfaces wrap up one deck heat conductive insulating glue-line fully, but guarantee its insulation and moisture and heat conduction by forms such as being coated with, spraying, soaking;
(b) neat one deck heat-conducting insulated film of respectively putting in above-mentioned network structure top and bottom, by modes such as hot pressing, hot melts, make heat-conducting insulated film be wrapped in around PTC thermistor 1 in the network structure, heat conduction conducting anodal 2 and the heat-conductivity conducting negative pole 3, semi-finished product framework intermediate gaps place heat-conducting insulated film up and down is bonded together fully, thereby form the heat conductive insulating rete, reach fixedly PTC thermistor 1 in the network structure, heat conduction conducting anodal 2 and heat-conductivity conducting negative pole 3, make it can not become flexible, thereby reach the moistureproof conductive force of complete isolated insulation;
4) after heat generating member main body (shown in Figure 1) is made into, carry out appearance design according to the specific requirement of various warmers and make (i.e. upward various decoration external packings of coating, as the required special bed clothes of electric blanket, the required special outer dress leatherware of electric heating cushion), its related process is made according to conventional heat sink; Again according to the circuit design requirement; connect the power line (input is that the sound of standard is inserted the formula plug) of the switch enclosure that has the excess-current excess-temperature over-voltage protecting function at its both positive and negative polarity; again according to designing requirement configuring direct current power supply adaptor (input voltage: 220VAC; output voltage: MAX:12VDC, maximum output current: 2A) and meet the rechargeable battery (as Ni-MH battery, nickel-cadmium cell, lithium lithium battery etc.) of safety requirements.
5) finished product is done test event detections such as safety according to the sampling of attribute sampling detection method, and the qualified back of project is according to supporting inventory packing after tested.
6) according on address according to the different application needs, can produce all kinds of daily heating products (such as electric blanket, electric heating cushion, electrically-heating vest, hot compress instrument (containing segmentation products such as protecting abdomen, waist support, knee-pad) etc.).
Embodiment 2
See also shown in Figure 5ly, shown in Fig. 5 is the electric heating element of making the electric heating cushion.DC power supply is used in design: output 12VDC, maximum current: 2A, selecting Curie temperature is 55 ℃, R25 resistance is that 500 ± 50 Ω, voltage endurance capability reach the above ceramic positive temperature coefficient thermosensitive resistor of 500V, makes 9 * 7 network structures that PTC thermistor 1 constitutes as shown in Figure 5 according to aforementioned manner; Initial heating power is 18W, and actual measurement goes out electric heating cushion persistent fever, and to reach the thermal equilibrium temperature time by normal temperature be 135 seconds, and temperature is 49.5 ℃ during heat balance, and this moment, heating power was 9.3W.
Concrete manufacture method is as follows:
(1) select suitable PTC thermistor 1 as required: Curie temperature is 55 ℃, and R25 resistance is that 500 ± 50 Ω, voltage endurance capability reach the above ceramic positive temperature coefficient thermosensitive resistor of 500V;
(2) heat conduction conducting positive pole 2, heat-conductivity conducting negative pole 3 and PTC thermistor 1 assemble by job requirements on frock clamp, and at the suitable solder(ing) paste of assigned position drop, make heat conduction conducting positive pole 2, heat-conductivity conducting negative pole 3 be connected firmly by hot weld/Reflow Soldering/modes such as tin stove weldering then with PTC thermistor 1, form 9 * 7 outside framework, it is electrothermal piece 4, carry out subsequent job again after process drawing/Performance Detection is qualified, as shown in Figure 5;
3) on the basis of above-mentioned semi-finished product (network structure), can select any mode in following two kinds of technologies thereafter:
(a) select a kind of thermal conductive insulation glue to make PTC thermistor 1 in the network structure, heat conduction conducting anodal 2 and heat-conductivity conducting negative pole 3 outer surfaces wrap up one deck heat conductive insulating glue-line fully, but guarantee its insulation and moisture and heat conduction by forms such as being coated with, spraying, soaking;
(b) neat one deck heat-conducting insulated film of respectively putting in above-mentioned network structure top and bottom, by modes such as hot pressing, hot melts, make heat-conducting insulated film be wrapped in around PTC thermistor 1 in the network structure, heat conduction conducting anodal 2 and the heat-conductivity conducting negative pole 3, semi-finished product framework intermediate gaps place heat-conducting insulated film up and down is bonded together fully, thereby form the heat conductive insulating rete, reach fixedly PTC thermistor 1 in the network structure, heat conduction conducting anodal 2 and heat-conductivity conducting negative pole 3, make it can not become flexible, thereby reach the moistureproof conductive force of complete isolated insulation;
4) after the heat generating member body making becomes, carry out appearance design according to the specific requirement of electric heating cushion and make, promptly coat to go up and decorate external packing 6, in specific embodiments of the invention, decorating external packing 6 is the required special outer dress leatherwares of electric heating cushion; Again according to the circuit design requirement; connect the power line (input is that the sound of standard is inserted the formula plug) of the switch enclosure that has the excess-current excess-temperature over-voltage protecting function at its both positive and negative polarity; again according to designing requirement configuring direct current power supply adaptor (input voltage: 220VAC; output voltage: 12VDC, maximum output current: 2A) and meet the rechargeable battery (as Ni-MH battery, nickel-cadmium cell, lithium lithium battery etc.) of safety requirements.
5) finished product is done test event detections such as safety according to the sampling of attribute sampling detection method, and the qualified back of project is according to supporting inventory packing after tested.
Obviously, the arrangement of heat conduction conducting anodal 2 and heat-conductivity conducting negative pole 3 is not a kind of here in the foregoing description, can and set according to the concrete condition requirement.
More obvious in addition is in the circuit design, to be assurance heat efficiency height in present embodiment, requirements such as low energy consumption, each electric heating element 4 can be square, also can be the design of polygons such as triangle, pentagon, hexagon, as long as principle satisfies the spirit of the invention.
The present invention utilizes PTC thermistor 1 energising back self-heating, cause the component body temperature to rise, the anti-transition district that enters of its component resistance, electric current descends rapidly, when its heat radiation power and heating power maintain an equal level, electric current is steady state value Ir in its circuit, and this moment, PTC thermistor 1 surface temperature also maintained steady state value.The present invention selects low-voltage dc power supply (MAX:12VDC) for use, has advantages such as no electromagenetic wave radiation, constant temperature; Internal structure adopts netted conduction mode in parallel, heater element is not fragile, and whole heater element body structure surface is coated with one deck heat conductive insulating layer 5, and its insulation voltage reaches 1200V, and PTC thermistor 1 exclusive characteristic is when the circuit operate as normal, PTC thermistor 1 resistance R
0The less electric current that do not hinder passes through; And when overcurrent, overload or fault such as overheated appear in circuit, PTC thermistor 1 surface temperature rises rapidly, its internal impedance rises with temperature and increases, and rise to high-impedance state when surpassing its switch temperature moment, thereby in time the restricting circuits electric current is to very low-level protective circuit; And circuit design of the present invention has overcurrent-overvoltage overheat protector function, can not have any disaster hidden-trouble.55 ℃ of surface temperature maximums of the present invention see through the top layer lapping and promptly decorate external packing 6, help to eliminate human-body fatigue.
The present invention can make different product according to the difference of decorating external packing 6, relates to multiple daily electric heater such as electric blanket, electric heating cushion, electrically-heating vest, hot compress instrument (containing segmentation products such as protecting abdomen, waist support, knee-pad) etc.
To sum up, electric heating element design uniqueness of the present invention is skillfully constructed, and is simple for structure, has no electromagenetic wave radiation, constant temperature, coefficient of safety height, eliminates human-body fatigue and makes simple, low cost and other advantages, is suitable for large-scale promotion application.
In this specification, the present invention is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (13)
1. electric heating element, it is characterized in that, comprise electric heating element, described electric heating element comprises heat-conductivity conducting positive pole, heat-conductivity conducting negative pole and at least two PTC thermistors, described PTC thermistor is connected with described heat-conductivity conducting negative electricity with described heat-conductivity conducting is anodal between described heat-conductivity conducting positive pole and described heat-conductivity conducting negative pole and respectively, and described heat-conductivity conducting positive pole, described heat-conductivity conducting negative pole and described PTC thermistor cloth reticulate structure.
2. electric heating element according to claim 1 is characterized in that, described heat-conductivity conducting positive pole and described heat-conductivity conducting negative pole are parallel to each other and crisscross setting.
3. electric heating element according to claim 1 is characterized in that, described network structure is the polygon network structure.
4. electric heating element according to claim 1 is characterized in that, described electric heating element also comprises the heat conductive insulating layer, and described heat conductive insulating layer coats described electric heating element.
5. electric heating element according to claim 4, it is characterized in that, institute's heat conductive insulating layer comprises heat conductive insulating layer and following heat conductive insulating layer, thereby described heat conductive insulating layer and the described following heat conductive insulating layer gone up coats the upper surface and the lower surface of described electric heating element respectively and interconnect and coat described electric heating element.
6. electric heating element according to claim 4 is characterized in that, described electric heating element also comprises the decoration external packing, and described decoration external packing coats described conduction insulating barrier.
7. electric heating element according to claim 4 is characterized in that, described electric heating element also comprises DC power supply, is electrically connected with described electric heating element thereby described DC power supply wears described heat conductive insulating layer by lead.
8. electric heating element according to claim 7; it is characterized in that; described electric heating element also comprises excess-current excess-temperature overvoltage protection parts, and described excess-current excess-temperature overvoltage protection parts are arranged in the described lead that connects described DC power supply and described electric heating element.
9. the manufacture method of an electric heating element according to claim 1 is characterized in that, may further comprise the steps:
1) described PTC thermistor is placed between the anodal and described heat-conductivity conducting negative pole of described heat-conductivity conducting and be connected with described heat-conductivity conducting negative electricity with described heat-conductivity conducting is anodal respectively;
2) described heat-conductivity conducting positive pole, described heat-conductivity conducting negative pole and described PTC thermistor cloth are reticulated structure.
10. the manufacture method of electric heating element according to claim 9 is characterized in that, described electric heating element also comprises the heat conductive insulating layer, and the manufacture method of described electric heating element also comprises step:
3) coat described electric heating element with described heat conductive insulating layer.
11. the manufacture method of electric heating element according to claim 10 is characterized in that, described electric heating element also comprises the decoration external packing, and the manufacture method of described electric heating element also comprises step:
4) coat described conduction insulating barrier with described decoration external packing.
12. the manufacture method of electric heating element according to claim 10 is characterized in that, described electric heating element also comprises DC power supply, and the manufacture method of described electric heating element also comprises step:
5) thus adopting lead to wear described heat conductive insulating layer is electrically connected described DC power supply with described electric heating element.
13. the manufacture method of electric heating element according to claim 12 is characterized in that, described electric heating element also comprises excess-current excess-temperature overvoltage protection parts, and the manufacture method of described electric heating element also comprises step:
6) described excess-current excess-temperature overvoltage protection parts are arranged in the described lead that connects described DC power supply and described electric heating element.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104093224A (en) * | 2014-06-11 | 2014-10-08 | 浙江西德斯电气有限公司 | Heating plate based on large-power thick-membrane resistor, and parallel screen printing method thereof |
| CN105282881A (en) * | 2015-06-28 | 2016-01-27 | 洛阳德威机电科技有限公司 | Long-wave heat-ray woven heating mat electric heating part and preparation thereof |
| CN105433464A (en) * | 2015-05-29 | 2016-03-30 | 冯欣悦 | Waist support |
| CN105433466A (en) * | 2015-05-29 | 2016-03-30 | 冯欣悦 | Kneecap |
| CN109743792A (en) * | 2018-12-07 | 2019-05-10 | 武汉航空仪表有限责任公司 | A kind of PTC ceramics heater |
| CN112611473A (en) * | 2020-12-02 | 2021-04-06 | 句容市双诚电子有限公司 | Temperature sensor with NTC thermosensitive chip and preparation process thereof |
| US20210260962A1 (en) * | 2018-08-21 | 2021-08-26 | Truma Gerätetechnik GmbH & Co. KG | Heating device for heating air |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104093224A (en) * | 2014-06-11 | 2014-10-08 | 浙江西德斯电气有限公司 | Heating plate based on large-power thick-membrane resistor, and parallel screen printing method thereof |
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| CN105282881A (en) * | 2015-06-28 | 2016-01-27 | 洛阳德威机电科技有限公司 | Long-wave heat-ray woven heating mat electric heating part and preparation thereof |
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| CN109743792A (en) * | 2018-12-07 | 2019-05-10 | 武汉航空仪表有限责任公司 | A kind of PTC ceramics heater |
| CN112611473A (en) * | 2020-12-02 | 2021-04-06 | 句容市双诚电子有限公司 | Temperature sensor with NTC thermosensitive chip and preparation process thereof |
| CN112611473B (en) * | 2020-12-02 | 2023-04-07 | 句容市双诚电子有限公司 | Temperature sensor with NTC thermosensitive chip and preparation process thereof |
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