CN113905467B - Improved PTC heater and preparation method thereof - Google Patents
Improved PTC heater and preparation method thereof Download PDFInfo
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- CN113905467B CN113905467B CN202111298776.2A CN202111298776A CN113905467B CN 113905467 B CN113905467 B CN 113905467B CN 202111298776 A CN202111298776 A CN 202111298776A CN 113905467 B CN113905467 B CN 113905467B
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- silica gel
- aluminum pipe
- ptc heater
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- heating
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- 238000002360 preparation method Methods 0.000 title abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 107
- 239000000741 silica gel Substances 0.000 claims abstract description 106
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 106
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 76
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 76
- 238000010438 heat treatment Methods 0.000 claims abstract description 69
- 238000007789 sealing Methods 0.000 claims abstract description 31
- 238000002485 combustion reaction Methods 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000919 ceramic Substances 0.000 claims description 19
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 8
- 239000003292 glue Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000010304 firing Methods 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 12
- 230000006872 improvement Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 229920001296 polysiloxane Polymers 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
- H05B3/04—Waterproof or air-tight seals for heaters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
-
- 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
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
- H05B3/141—Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Resistance Heating (AREA)
Abstract
The invention relates to an improved PTC heater and a preparation method thereof, wherein the preparation method of the improved PTC heater comprises the following steps: arranging a heating core body in an aluminum pipe, respectively plugging two first silica gel plugs at two ends of the aluminum pipe, and performing primary sealing; carrying out hydraulic pressure on the aluminum pipe; carrying out high-temperature dry combustion on the hydraulic aluminum pipe, wherein the high-temperature dry combustion temperature is higher than the normal water-feeding temperature; a first silica gel layer is respectively arranged at two ends of the aluminum pipe for secondary sealing; two second silica gel plugs are respectively plugged into two ends of the aluminum pipe, and three times of sealing are carried out; and two ends of the aluminum pipe are respectively provided with a second silica gel layer for four times of sealing. Through the arrangement, the problems that the service life and the safety of the PTC heating piece are influenced due to the fact that the silica gel element Yi Gaowen in the heating pipe volatilizes the reducing substances and the waterproof sealing problem in the traditional PTC water heating heater can be solved.
Description
Technical Field
The invention relates to the technical field of PTC heaters, in particular to an improved PTC heater and a preparation method thereof.
Background
The PTC heater product has been widely used in various fields such as wind heating (e.g., air conditioner auxiliary heating, warm air blower, bathroom heater, etc.), defrosting or heating of a conventional fuel automobile, and heating in a new energy automobile or battery heating due to its special positive temperature coefficient characteristic.
Compared with the traditional heating wire, the electric heating tube and the far infrared quartz heater, the PTC heater adopts PTC ceramic as a core heating element, and has the advantages of automatic temperature control, wide use voltage range, safety and reliability without open fire, long service life and the like. Therefore, the application range of the PTC heater is widened, and the PTC heater is widely used in the field of liquid heating.
In the field of water heating heaters, PTC heating tubes are typically placed in water to transfer heat generated by PTC ceramic elements to the water being heated.
Unlike the air heater, the water heater has a high sealing requirement. Because the heating pipe directly works in water or is heated by other heat dissipation components and is not in direct contact with water, the heating pipe is easy to be infiltrated by the water. Therefore, development of PTC water heating pipes having good sealability has become an increasingly important subject.
In the existing PTC water heater, the head and tail parts of a heating pipe are sealed through a silica gel plug and sealing silica gel. However, this sealing structure has a very large disadvantage in that when the PTC heater is powered on, the temperature increases sharply, and the silicone plug and the sealing silicone gel volatilize some small molecular reducing substances at high temperature, because the heating pipe is in a sealed state, and these reducing atmospheres remain in the pipe all the time; when the PTC heating sheet in the heating pipe is electrified and used in a reducing atmosphere, the surface oxidation barrier of the PTC heating sheet can be weakened, so that the PTC effect of the PTC sheet is reduced, the PTC sheet is easy to break down and short circuit after long-time use, and the service life and the safety of the PTC heater can be reduced.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide an improved PTC heater and a preparation method thereof, wherein the preparation method of the improved PTC heater is used for solving the problems that the service life and the safety of a PTC heating sheet are influenced due to the fact that a silica gel element Yi Gaowen in a sealing heating pipe in the traditional PTC water heating heater volatilizes a reducing substance.
In order to achieve one of the above objects, an embodiment of the present invention provides a method for manufacturing an improved PTC heater, comprising:
step A: arranging a heating core body in an aluminum pipe, respectively plugging two first silica gel plugs at two ends of the aluminum pipe, and performing primary sealing;
and (B) step (B): carrying out hydraulic pressure on the aluminum pipe;
step C: carrying out high-temperature dry combustion on the hydraulic aluminum pipe, wherein the high-temperature dry combustion temperature is higher than the normal water-feeding temperature;
step D: a first silica gel layer is respectively arranged at two ends of the aluminum pipe for secondary sealing;
step E: two second silica gel plugs are respectively plugged into two ends of the aluminum pipe, and three times of sealing are carried out;
step F: and two ends of the aluminum pipe are respectively provided with a second silica gel layer for four times of sealing.
As a further improvement of the embodiment of the present invention, in the step C, "the aluminum pipe subjected to high temperature dry combustion after the hydraulic pressure" specifically includes:
and (3) carrying out high-temperature dry combustion on the hydraulic aluminum pipe for one to five hours under rated voltage.
As a further improvement of one embodiment of the present invention, before step a, the method further includes:
and wrapping the PTC ceramic element and the two metal electrode plates through an insulating layer to manufacture the heating core body.
As a further improvement of the embodiment of the present invention, in the step D, "disposing the first silica gel layers at both ends of the aluminum pipe" specifically includes:
and respectively coating silica gel glue on two ends of the aluminum pipe to form the first silica gel layer.
As a further improvement of an embodiment of the present invention, in the step F, "disposing second silica gel layers at both ends of the aluminum pipe" specifically includes:
and respectively coating silica gel glue on two ends of the aluminum pipe to form the second silica gel layer.
An embodiment of the present invention also provides an improved PTC heater manufactured based on the method for manufacturing an improved PTC heater according to any one of the above;
the improved PTC heater comprises the heating core body, the aluminum pipe, two first silica gel plugs, the first silica gel layers, two second silica gel plugs and the second silica gel layers; the heating core body is sleeved in the aluminum pipe; the first silica gel plug, the first silica gel layer, the second silica gel plug and the second silica gel layer are all arranged at two ends of the aluminum pipe and are sequentially distributed from inside to outside.
As a further improvement of an embodiment of the present invention, the heating core includes a PTC ceramic element, two metal electrode sheets, and an insulating layer, and the insulating layer is coated on the outer circumferences of the PTC ceramic element and the two metal electrode sheets.
As a further improvement of an embodiment of the present invention, the aluminum pipe and the heating core are in close contact with each other.
As a further improvement of an embodiment of the present invention, the improved PTC heater is a water heating heater.
As a further improvement of an embodiment of the present invention, the improved PTC heater is a PTC water heater for SPA.
Compared with the prior art, the invention has the beneficial effects that:
firstly, sealing a heating core body in an aluminum pipe through a first silica gel plug at one time, and then strengthening the sealing effect through overall hydraulic pressure;
then, the whole body is subjected to high-temperature dry combustion, and the high-temperature dry combustion temperature is far higher than the normal water-supply temperature, so that the reducing substances in the silica gel plug volatilize and disappear as much as possible;
after the high-temperature dry heating is finished, sequentially arranging a first silica gel layer, a second silica gel plug and a second silica gel layer to strictly seal the head and tail parts of the aluminum pipe and manufacture a PTC heating pipe, so that the waterproof performance of the heating pipe is ensured;
thereby, volatile and reducing substances in the first silica gel plug are removed through high-temperature dry burning; sequentially forming multiple seals through the first silica gel layer, the second silica gel plug and the second silica gel layer; on the basis of ensuring good sealing performance of the PTC heating pipe, the silica gel can be prevented from volatilizing reducing substances during normal operation of the PTC heating pipe, so that the service life and the safety performance of the PTC heating sheet are greatly improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a schematic flow chart of a method for manufacturing an improved PTC heater according to an embodiment of the present invention;
fig. 2 is a schematic view showing an exploded structure of the improved PTC heater according to an embodiment of the present invention;
FIG. 3 is a schematic view of a connection structure of the aluminum pipe and the first silica gel plug according to an embodiment of the present invention;
fig. 4 is a schematic view showing the structure of the aluminum pipe subjected to four seals according to an embodiment of the present invention.
Wherein reference numerals are as follows:
the heating core body 1, the PTC ceramic element 11, the aluminum pipe 2, the first silica gel plug 3, the first silica gel layer 4, the second silica gel plug 5 and the second silica gel layer 6.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below in conjunction with the detailed description of the present invention and the corresponding drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.
As shown in fig. 1, an embodiment of the present invention provides a method for manufacturing an improved PTC heater, comprising:
step A: the heating core body 1 is arranged in an aluminum pipe 2, two first silica gel plugs 3 are respectively plugged into two ends of the aluminum pipe 2, and primary sealing is carried out;
and (B) step (B): hydraulic pressure is carried out on the aluminum pipe 2;
step C: carrying out high-temperature dry combustion on the hydraulic aluminum pipe 2, wherein the high-temperature dry combustion temperature is higher than the normal water-feeding temperature;
step D: two ends of the aluminum pipe 2 are respectively provided with a first silica gel layer 4 for secondary sealing;
step E: two second silica gel plugs 5 are respectively plugged into two ends of the aluminum pipe 2, and three times of sealing are carried out;
step F: two ends of the aluminum pipe 2 are respectively provided with a second silica gel layer 6 for four times of sealing.
Specifically, the heating core body 1 is sealed in the aluminum pipe 2 through the first silica gel plug 3 at one time, and then the sealing effect is enhanced integrally by hydraulic pressure;
then, the whole body is subjected to high-temperature dry combustion, and the high-temperature dry combustion temperature is far higher than the normal water-supply temperature, so that the reducing substances in the silica gel plug volatilize and disappear as much as possible;
after the high-temperature dry heating is finished, a first silica gel layer 4, a second silica gel plug 5 and a second silica gel layer 6 are sequentially arranged to strictly seal the head and tail parts of the aluminum pipe 2 and manufacture a PTC heating pipe, so that the waterproof performance of the heating pipe is ensured;
thereby, volatile and reducing substances in the first silica gel plug 3 are removed by high-temperature dry combustion; then sequentially forming multiple seals through the first silica gel layer 4, the second silica gel plug 5 and the second silica gel layer 6; on the basis of ensuring good sealing performance of the PTC heating pipe, the silica gel can be prevented from volatilizing reducing substances during normal operation of the PTC heating pipe, so that the service life and the safety performance of the PTC heating sheet are greatly improved.
In actual operation, a dry heating process is added after the aluminum tube hydraulic process to solve the problem that the PTC heating sheet is affected by volatilization of the reducing substances of the silica gel element Yi Gaowen.
That is, dry burning is adopted to solve the problem that the silica gel plug or the silica gel material generates reducing gas at high temperature, thereby preventing the reducing gas from influencing the withstand voltage of the PTC sheet, and greatly improving the service life and the safety of the PTC heater.
Further, in the step C, "performing high-temperature dry combustion on the aluminum pipe 2 after the hydraulic pressure" specifically includes:
the aluminum pipe 2 after the hydraulic pressure is subjected to high-temperature dry combustion at rated voltage for one to five hours.
In actual operation, the aluminum pipe 2 after hydraulic pressure is subjected to high-temperature dry combustion at rated voltage for one to five hours, and the reducing substances in the silica gel plug can be volatilized as much as possible due to the high-temperature dry combustion (because the dry combustion temperature is far higher than the water passing temperature, and the higher the temperature is, the more the reducing atmosphere volatilizes for the silica gel substances).
Since only one silica gel plug is sealed at both ends of the aluminum tube 2 at this time, most of the volatilized reducing substances run out and only a small amount remains in the tube.
Further, before step a, the method further includes:
the PTC ceramic element 11 and the two metal electrode sheets are wrapped with an insulating layer to produce the heating core 1.
In actual use, the PTC heater adopts a PTC ceramic sheet as a core heating element; the PTC ceramic sheet has positive temperature coefficient thermosensitive effect, can automatically control temperature, and has wide application voltage range, no open fire, safety and reliability and long service life.
In actual operation, the PTC ceramic element 11, the two metal electrode sheets are first wrapped with an insulating layer and then plugged into the aluminum tube 2 to make a PTC heating tube.
Further, in the step D, "disposing the first silica gel layers 4 at the two ends of the aluminum tube 2" specifically includes:
two ends of the aluminum pipe 2 are respectively coated with silica gel glue to form a first silica gel layer 4.
Further, in the step F, "disposing the second silica gel layers 6 at the two ends of the aluminum tube 2" specifically includes:
and two ends of the aluminum pipe 2 are respectively coated with silica gel glue to form a second silica gel layer 6.
In actual operation, after the PTC ceramic element 11 and the two metal electrode sheets are wrapped with the insulating layer and then plugged into the aluminum tube 2, the head and tail parts of the aluminum tube 2 are respectively plugged into a silica gel plug, hydraulic pressure of the aluminum tube 2 is performed, and then high-temperature dry combustion is performed.
Then, the end of the aluminum tube 2 is sealed by silica gel, and then a silica gel plug is plugged into each silica gel plug, and finally a layer of silica gel is sealed.
Therefore, on one hand, in daily use, when the PTC heater works normally, the temperature is lower, and the innermost silica gel plug cannot volatilize harmful reducing atmosphere at the lower temperature due to the fact that the silica gel plug is subjected to high-temperature dry combustion; on the other hand, the two layers of sealing silica gel outside the innermost silica gel plug and the reducing atmosphere volatilized by one silica gel plug respectively are mostly blocked by the innermost silica gel plug and cannot enter the aluminum tube 2, so that the PTC effect of the PTC sheet is affected.
As shown in fig. 2 to 4, an embodiment of the present invention also provides an improved PTC heater manufactured based on the manufacturing method of the improved PTC heater according to any one of the above;
the improved PTC heater comprises a heating core body 1, an aluminum pipe 2, two first silica gel plugs 3, a first silica gel layer 4, two second silica gel plugs 5 and a second silica gel layer 6; the heating core body 1 is sleeved in the aluminum pipe 2; the first silica gel plug 3, the first silica gel layer 4, the second silica gel plug 5 and the second silica gel layer 6 are all arranged at two ends of the aluminum pipe 2 and are sequentially distributed from inside to outside.
In actual use, the two sealing silica gel plugs at the head and the tail and the two layers of sealing silica gel play a good sealing role.
Further, the heating core 1 includes a PTC ceramic element 11, two metal electrode sheets, and an insulating layer, and the insulating layer is coated on the outer circumferences of the PTC ceramic element 11 and the two metal electrode sheets.
In actual use, the PTC heater adopts a PTC ceramic sheet as a core heating element; the PTC ceramic sheet has positive temperature coefficient thermosensitive effect, can automatically control temperature, and has wide application voltage range, no open fire, safety and reliability and long service life.
In actual operation, the PTC ceramic element 11, the two metal electrode sheets are first wrapped with an insulating layer and then plugged into the aluminum tube 2 to make a PTC heating tube.
Further, the aluminum pipe 2 and the heating core 1 are closely adhered to each other.
In actual use, through hydraulic processing, aluminum pipe 2, heating core 1 are closely laminated, can promote heat conductivility.
Further, the improved PTC heater is a water heating heater.
Further, the improved PTC heater is a PTC water heating heater for SPA.
It should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is for clarity only, and that the skilled artisan should recognize that the embodiments may be combined as appropriate to form other embodiments that will be understood by those skilled in the art.
The above list of detailed descriptions is only specific to practical embodiments of the present invention, and is not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method of making an improved PTC heater comprising:
step A: arranging a heating core body in an aluminum pipe, respectively plugging two first silica gel plugs at two ends of the aluminum pipe, and performing primary sealing;
and (B) step (B): carrying out hydraulic pressure on the aluminum pipe;
step C: carrying out high-temperature dry combustion on the hydraulic aluminum pipe, wherein the high-temperature dry combustion temperature is higher than the normal water-feeding temperature;
step D: a first silica gel layer is respectively arranged at two ends of the aluminum pipe for secondary sealing;
step E: two second silica gel plugs are respectively plugged into two ends of the aluminum pipe, and three times of sealing are carried out;
step F: and two ends of the aluminum pipe are respectively provided with a second silica gel layer for four times of sealing.
2. The method of manufacturing an improved PTC heater according to claim 1, wherein in step C, "high temperature dry-firing of the aluminum tube after hydraulic pressure" specifically comprises:
and (3) carrying out high-temperature dry combustion on the hydraulic aluminum pipe for one to five hours under rated voltage.
3. A method of making an improved PTC heater according to claim 2 wherein prior to step a, the method further comprises:
and wrapping the PTC ceramic element and the two metal electrode plates through an insulating layer to manufacture the heating core body.
4. A method of manufacturing an improved PTC heater according to claim 3 wherein in step D, the step of disposing the first silica gel layers on both ends of the aluminum tube comprises:
and respectively coating silica gel glue on two ends of the aluminum pipe to form the first silica gel layer.
5. The method of manufacturing an improved PTC heater according to claim 4, wherein in step F, "second silica gel layers are respectively provided at both ends of the aluminum tube" specifically comprises:
and respectively coating silica gel glue on two ends of the aluminum pipe to form the second silica gel layer.
6. An improved PTC heater according to any one of claims 1 to 5, wherein the improved PTC heater is manufactured by a method of manufacturing the same;
the improved PTC heater comprises the heating core body, the aluminum pipe, two first silica gel plugs, the first silica gel layers, two second silica gel plugs and the second silica gel layers; the heating core body is sleeved in the aluminum pipe; the first silica gel plug, the first silica gel layer, the second silica gel plug and the second silica gel layer are all arranged at two ends of the aluminum pipe and are sequentially distributed from inside to outside.
7. An improved PTC heater according to claim 6 wherein the heating core comprises a PTC ceramic element, two metal electrode sheets, and an insulating layer which is coated on the outer circumferences of the PTC ceramic element and the two metal electrode sheets.
8. An improved PTC heater according to claim 7 wherein the aluminum tube and the heating core are in intimate contact.
9. An improved PTC heater according to claim 8 wherein the improved PTC heater is a water heating heater.
10. The improved PTC heater according to claim 9, wherein the improved PTC heater is a SPA PTC water heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111298776.2A CN113905467B (en) | 2021-11-04 | 2021-11-04 | Improved PTC heater and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111298776.2A CN113905467B (en) | 2021-11-04 | 2021-11-04 | Improved PTC heater and preparation method thereof |
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| CN113905467A CN113905467A (en) | 2022-01-07 |
| CN113905467B true CN113905467B (en) | 2023-08-01 |
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| CN202111298776.2A Active CN113905467B (en) | 2021-11-04 | 2021-11-04 | Improved PTC heater and preparation method thereof |
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| EP1672958A2 (en) * | 2004-12-15 | 2006-06-21 | Bleckmann GmbH & Co. KG | Thickfilm heating tube |
| CN102333391A (en) * | 2010-08-31 | 2012-01-25 | 上海吉龙塑胶制品有限公司 | Small-sized pool and PTC (Positive Temperature Coefficient) heater for heating liquid in pool |
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| CN113905467A (en) | 2022-01-07 |
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