CN104540252A - PTC electric heating device - Google Patents
PTC electric heating device Download PDFInfo
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- CN104540252A CN104540252A CN201410766281.1A CN201410766281A CN104540252A CN 104540252 A CN104540252 A CN 104540252A CN 201410766281 A CN201410766281 A CN 201410766281A CN 104540252 A CN104540252 A CN 104540252A
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Abstract
The invention discloses a PTC electric heating device. The PTC electric heating device comprises a PTC electric heating pipe. A first insulation end and a first installation plate are arranged at the first end of the PTC electric heating pipe, wherein the first installation plate is used for installing the PTC electric heating pipe to an evaporator and is connected with the first installation end. A controller, a power line, a second insulation end, a second installation plate and an elastic module are arranged at the second end of the PTC electric heating pipe, wherein the power line is electrically connected with the controller, the second installation plate is connected with the second insulation plate, and the elastic module is arranged at the second insulation end. Due to the fact that the elastic module produces shape change springback, the PTC electric heating pipe is moved towards the first installation plate to be attached to the evaporator, the PTC electric heating pipe cannot slide, and a gap between the PTC electric heating pipe and a left end plate of the evaporator and a gap between the PTC electric heating pipe and a right end plate of the evaporator are eliminated. The PTC electric heating pipe is not prone to sliding, and the situation that the position of the PTC electric heating pipe is repeatedly adjusted due to hole displacement cannot occur. Thus, production and installation are facilitated, and the production efficiency is effectively improved.
Description
Technical field
The present invention relates to heating element technical field, particularly relate to a kind of PTC electric heater unit and the air conditioner with PTC electric heater unit.
Background technology
In prior art, the step that PTC electric heating is installed to evaporator comprises: fixed by the panel beating end plate being arranged on evaporator two ends by the copper pipe of evaporator.Wherein the panel beating end plate side of evaporator both sides is provided with circular hole, and opposite side is provided with draw-in groove; After copper pipe is fixing, automatic welding stove weld ell put into by evaporator; Plastic end panel being installed to after welding has welded on the evaporator of elbow; Finally electrically heated for PTC one end is inserted in circular hole corresponding in panel beating end plate, then PTC electric heating other end end is put into the draw-in groove place of panel beating end plate, aim at two screw holes in plastic end panel, outside plastic end panel, play two screws fix PTC electric heating.
Because PTC electric heating and two ends, evaporator left and right panel beating end plate exist fit-up gap, produce when making hold-down screw and often occur that PTC electric heating is slided, cause the screw hole in electric heating and the screw hole misalignment in plastic end panel, screw cannot be played, need the position readjusting PTC, allow it aim at two screw holes in plastic end panel.The PTC electric heating of this structure is inconvenient to produce installation, reduces production efficiency.
Summary of the invention
In order to overcome above-mentioned deficiency of the prior art, the object of the invention is to, a kind of PTC electric heater unit is provided, can be convenient to produce and install, effectively enhance productivity.
For reaching this object, the invention provides a kind of PTC electric heater unit, comprise: PTC electric heating tube, the first end of described PTC electric heating tube is provided with the first insulating end and for described PTC electric heating tube being mounted to the first mounting panel that evaporator is connected with described first insulating end; Second end of described PTC electric heating tube is provided with controller, the power line be electrically connected with described controller, the second insulating end and the second mounting panel be connected with described second insulating end, and is arranged on the elastic parts on described second insulating end.
Preferably, described first mounting panel is provided with installing hole;
Internal thread is provided with in described installing hole.
Preferably, also comprise: be arranged in parallel with described PTC electric heating tube, and the cross-brace beam be connected with described first insulating end and described second insulating end injection moulding, be arranged in the middle part of described cross-brace beam, the longitudinal carrier be simultaneously connected with described cross-brace beam and described PTC electric heating tube.
Preferably, the cross sectional shape of described cross-brace beam is U-shaped;
Described cross-brace beam offers multiple air-flow openings.
Preferably, described elastic parts adopts the mode of injection moulding to be connected with described second insulating end.
Preferably, described PTC electric heating tube is provided with radiator and electric heater; Described electric heater comprises shell and is built in the ceramic PTC electric heater in described shell.
Preferably, described ceramic PTC electric heater has multiple ceramic PTC electric heating unit, ceramic PTC electric heating unit described in each includes at least a slice potsherd and PTC sheet, PTC sheet two ends in ceramic PTC electric heating unit described in each scribble silver-colored conductive electrode, battery lead plate is provided with the PTC sheet of each unit is in parallel at the PTC sheet two ends scribbling silver-colored conductive electrode, between described battery lead plate and described shell, be provided with insulating paper, described shell is contained in described radiator.
Preferably, described shell is aluminum pipe;
Described radiator is aluminium heat sink strip, and in wavy and have Teflon dope layer along the surface attachment of radiator described in described shell longitudinal extension;
Described aluminum pipe and described radiator are fixed as one by silica gel or fine weldering.
Preferably, between described battery lead plate and described potsherd, and be coated with between the silver-colored conductive electrode at described battery lead plate and described PTC sheet two ends and be brushed with silica gel;
Silica gel is filled with in the chamber of the described battery lead plate outside described aluminum pipe two ends;
Described battery lead plate outside described aluminum pipe two ends is connected with terminal.
Preferably, air conditioner comprises: PTC electric heater unit and evaporator;
Described evaporator comprises: evaporator body, be arranged on described evaporator body left end, connect plastics first member plate and the panel beating first member plate of described PTC electric heater unit first mounting panel, for the screw making described PTC electric heater unit first mounting panel be threaded with described plastics first member plate, and be arranged on the panel beating right end plate of described evaporator body right-hand member;
Described panel beating right end plate is provided with the installation position for installing described PTC electric heater unit second insulating end, described installation position and elastic parts offset, for making described elastic parts compression, eliminate the joint gap of described PTC electric heater unit and described evaporator.
As can be seen from the above technical solutions, the present invention has the following advantages:
PTC electric heating tube first end is provided with the first mounting panel be mounted on evaporator, and the second end is provided with the second insulating end and is arranged on the elastic parts on described second insulating end.Like this, first the second insulating end of the band elastic parts of PTC electric heating tube is connected on evaporator, elastic parts is made to be in compressive state, again the first mounting panel of PTC electric heating tube is mounted on evaporator, due to elastic parts generation deformation resilience, fit on evaporator by PTC electric heating tube to the first mounting panel, PTC electric heating tube can not slide, the gap that elimination PTC electric heating tube and evaporator left and right two end plates exist.Just be not easy to occur that PTC electric heating tube slides, causing hole displacement can not move and repeat to adjust the position of PTC electric heating tube.Thus, be convenient to produce and install, effectively enhance productivity.
Term " first ", " second ", " the 3rd " " 4th " etc. (if existence) in specification of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiments of the invention described herein can with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, and intention is to cover not exclusive comprising.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Accompanying drawing explanation
In order to be illustrated more clearly in technical scheme of the present invention, be briefly described to the accompanying drawing used required in description below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the integrally-built enforcement illustration of PTC electric heater unit;
Fig. 2 is PTC electric heater unit elastic parts constructive embodiment figure;
Fig. 3 is the cross-brace beam of PTC electric heater unit and the cutaway view of PTC electric heating tube;
Fig. 4 is the cross-brace beam of PTC electric heater unit and the partial enlarged drawing of PTC electric heating tube;
Fig. 5 is that the cross-brace beam of PTC electric heater unit implements illustration;
Fig. 6 is that the electric heater structure of PTC electric heater unit implements illustration;
Fig. 7 is the electric heater structure partial enlarged drawing of PTC electric heater unit;
Fig. 8 is the integrally-built enforcement illustration of the air conditioner with PTC electric heater unit;
Fig. 9 is the explosive view of the overall structure embodiment of air conditioner with PTC electric heater unit.
Description of reference numerals:
1PTC electric heating tube, 2 first mounting panels, 3 first insulating ends, 4 second mounting panels, 5 second insulating ends, 6 elastic partss, 7 controllers, 8 power lines, 10PTC electric heater unit, 11 evaporators, 12 panel beating first member plates, 13 plastics first member plates, 14 panel beating right end plate, 15 screws, 21 cross-brace beams, 22 longitudinal carriers, 23 radiators, 24 electric heaters, 31PTC sheet, 32 silver electrodes, 33 aluminum pipe shells, 34 potsherds, 35 silica gel, 36 terminals, 37 insulating papers, 38 battery lead plates
Embodiment
For making goal of the invention of the present invention, feature, advantage can be more obvious and understandable; specific embodiment and accompanying drawing will be used below; the technical scheme of the present invention's protection is clearly and completely described; obviously; the embodiments described below are only the present invention's part embodiments, and the embodiment of not all.Based on the embodiment in this patent, those of ordinary skill in the art are not making other embodiments all obtained under creative work prerequisite, all belong to the scope of this patent protection.
The present embodiment provides a kind of PTC electric heater unit, refer to shown in Fig. 1, Fig. 2 and Fig. 9, comprise: the first end of PTC electric heating tube 1, PTC electric heating tube 1 is provided with the first insulating end 3 and for PTC electric heating tube 1 being mounted to the first mounting panel 2 that evaporator 11 is connected with the first insulating end 3; Second end of PTC electric heating tube 1 is provided with controller 7, power line 8, second insulating end 5 be electrically connected with controller 7 and the second mounting panel 4 be connected with the second insulating end 5, and is arranged on the elastic parts 6 on the second insulating end 5.
It can thus be appreciated that PTC electric heating tube 1 first end is provided with the elastic parts 6 that the first mounting panel 2, second end be mounted on evaporator 11 is provided with the second insulating end 5 and is arranged on the second insulating end 5.Like this, first the second insulating end 5 of the band elastic parts 6 of PTC electric heating tube 1 is connected on evaporator 11, elastic parts 6 is made to be in compressive state, again the first mounting panel 2 of PTC electric heating tube 1 is mounted on evaporator 11, because deformation resilience occurs elastic parts 6, fit on evaporator 11 by PTC electric heating tube 1 to the first mounting panel 2, PTC electric heating tube 1 can not slide, and eliminates the gap that PTC electric heating tube 1 exists with evaporator about 11 two end plates.Just be not easy to occur that PTC electric heating tube 1 slides, causing hole displacement can not move and repeat to adjust the position of PTC electric heating tube, thus, be convenient to produce and install, effectively enhance productivity.First mounting panel 2 is provided with installing hole; Internal thread is provided with in installing hole.And then after PTC electric heating tube 1 installs with evaporator 11, then by screw, PTC electric heating tube 1 and evaporator 11 are reinforced.
Preferably, elastic parts 6 adopts metal spring, or rubber spring.Elastic parts 6 adopts the mode of injection moulding to be connected with the second insulating end 5.
In the present embodiment, the first insulating end 3 and the second insulating end 5 adopt plastic material, or plastic material makes.
In the present embodiment, refer to shown in Fig. 3, Fig. 4 and Fig. 5, PTC electric heater unit also comprises: be arranged in parallel with PTC electric heating tube 1, and the cross-brace beam 21 be connected with the first insulating end 3 and the second insulating end 5 injection moulding, be arranged in the middle part of cross-brace beam 21, the longitudinal carrier 22 be simultaneously connected with cross-brace beam 21 and PTC electric heating tube 1.
Be understandable that, cross-brace beam 21 strengthens the radial strength of PTC electric heating tube 1, topic between easy radial deformation when solution PTC electric heating tube 1 length is longer.
Preferably, longitudinal carrier 22 can arrange more than one.
Cross-brace beam 21 offers multiple air-flow openings,
Cross-brace beam 21 offers multiple air-flow openings, such air-flow can flow through from air-flow openings, and the temperature making the wind after blowing over electric heating is more even, reduces institute and increases temperature profile effect in cross-brace beam 21 pairs of air channels, raising condensation effect.
Between such PTC electric heating tube 1 and cross-brace beam 21, radial 3 fixed constraints, play the object being strengthened PTC electric heating tube 1 radial strength by cross-brace beam 21; Axially only have left end and evaporator 11 fixed constraint, elastic parts 6 that is middle and right-hand member is all movable cooperation, when between cross-brace beam 21 and PTC electric heating tube, length changes relatively, cross-brace beam 21 and PTC electric heating tube can axial relative movements in activity points of engagement, inscribe mouth between solving that cross-brace beam 21 is different from PTC electric heating tube 1 thermal expansion rate and bringing
In the middle of cross-brace beam 21, cross-brace beam 21 and PTC electric heating tube 1 couple together by longitudinal carrier 22, the constraint of longitudinal carrier 22 pairs of PTC electric heating tubes 1 becomes two ends from the constraint of original two ends and adds middle 3 constraints, strengthens the radial constraint point to PTC electric heating tube.
In the present embodiment, refer to shown in Fig. 6 and Fig. 7, PTC electric heating tube 1 is provided with radiator 23 and electric heater 24; The ceramic PTC electric heater that electric heater 24 comprises shell 33 and is built in shell 33.
Ceramic PTC electric heater has multiple ceramic PTC electric heating unit, each ceramic PTC electric heating unit includes at least a slice potsherd 34 and PTC sheet 31, PTC sheet 31 two ends in each ceramic PTC electric heating unit scribble silver-colored conductive electrode 32, battery lead plate 38 is provided with the PTC sheet 31 of each unit is in parallel at PTC sheet 31 two ends scribbling silver-colored conductive electrode 32, between battery lead plate 38 and aluminum pipe shell 33, be provided with insulating paper 37, aluminum pipe shell 33 is contained in radiator 23.Aluminum pipe shell 33 is square aluminium tube, and square aluminium tube and radiator 23 are fixed as one by silica gel or fine weldering.Between battery lead plate 38 and potsherd 34, and be coated with between the silver electrode 32 at battery lead plate 38 and PTC sheet 31 two ends be brushed with silica gel lie prone the battery lead plate 38 outside square aluminium tube two ends chamber in be filled with silica gel 35, silica gel 35 mainly plays bonding and conductive force; Silica gel 35 mainly plays end face sealing function.Battery lead plate 38 outside square aluminium tube two ends is connected with terminal 36, so that lead-in wire.
The present invention adopts ceramic PTC (positive temperature coefficient, the positive temperature coefficient) electric heater 24 that material is made, and wherein ceramic PTC is based on BaTi03, ceramic crystal at high temperature phase transformation and a kind of temperature-sensitive element made.Electric heater 24 is exactly using ceramic PTC sheet as heater, according to different capacity requirement, selects the PTC sheet of varying number, brushes silver-colored conductive electrode 32 at PTC sheet two ends, uses long electrode plate 38 that PTC sheet is in parallel simultaneously; Be shell with aluminum pipe, between heater and aluminum pipe, add insulating paper 37; The element be integrated that is adhesively fixed for radiator 23, is welded by silica gel or fibre with aluminium corrugated plate in outside.When its characteristic shows as room temperature, resistance is less, and raise the increase of resistance step with temperature after energising, rapid temperature increases is to Curie point, stable operation in Tc point range then just below Curie point Tp and Curie, automatic regulating power realizes the installation site on air conditioner of equalized temperature point mouth ceramic PTC electric heater, between A/C evaporator and axial-flow fan, mainly meets wind speed maximum, to try one's best upright position with air outlet direction, be convenient to its efficiency of maximum performance.Because ceramic PTC sheet of the present invention mainly selects 250 DEG C of heating plates, so heater general surface temperature distributes greatly between 250 DEG C during non-normal working, far below 500 DEG C of temperature of tube electric heater, safe design requirement can be met in less space.
Because when ptc heater works, surface temperature reaches about 250 DEG C, common coating is difficult to Long-Time Service at such high temperatures.The surface attachment of radiator 23 has Teflon dope layer, and radiator is aluminium heat sink strip, and in wavy and along shell longitudinal extension.Teflon coating has excellent temperature tolerance, can at high temperature Long-Time Service.Patent of the present invention is taked at PTC; the aluminium heat sink strip of electric heater is disputed and is coated with Teflon coating; then through hot setting; form the protective layer that one deck is good; can effectively prevent condensed water from directly contacting with aluminum strip; avoid aluminium material surface to form oxide powder, both prevented dust pollution, and also extended useful life.
The present invention also provides a kind of air conditioner with PTC electric heater unit, and refer to shown in Fig. 8 and Fig. 9, air conditioner comprises: PTC electric heater unit 10 and evaporator 11;
Evaporator 11 comprises: evaporator body, be arranged on evaporator body left end, connect plastics first member plate 13 and the panel beating first member plate 12 of PTC electric heater unit first mounting panel, for the screw 15 making PTC electric heater unit 10 first mounting panel be threaded with plastics first member plate 13, and be arranged on the panel beating right end plate 14 of evaporator body right-hand member;
Panel beating right end plate 14 is provided with the installation position for installing PTC electric heater unit 10 second insulating end, and installation position and elastic parts offset, and for making elastic parts compression, eliminates the joint gap of PTC electric heater unit 10 and evaporator 11.
PTC electric heating tube 1 first end is provided with the elastic parts 6 that the first mounting panel 2, second end be mounted on evaporator 11 is provided with the second insulating end 5 and is arranged on the second insulating end 5.Like this, first the second insulating end 5 of the band elastic parts 6 of PTC electric heating tube 1 is connected on evaporator 11, elastic parts 6 is made to be in compressive state, again the first mounting panel 2 of PTC electric heating tube 1 is mounted on evaporator 11, because deformation resilience occurs elastic parts 6, fit on evaporator 11 by PTC electric heating tube 1 to the first mounting panel 2, PTC electric heating tube 1 can not slide, and eliminates the gap that PTC electric heating tube 1 exists with evaporator about 11 two end plates.Just be not easy to occur that PTC electric heating tube 1 slides, causing hole displacement can not move and repeat to adjust the position of PTC electric heating tube, thus, be convenient to produce and install, effectively enhance productivity.First mounting panel 2 is provided with installing hole; Internal thread is provided with in installing hole.And then after PTC electric heating tube 1 installs with evaporator 11, then by screw, PTC electric heating tube 1 and evaporator 11 are reinforced.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, identical similar portion reference mutually between each embodiment.
Claims (10)
1. a PTC electric heater unit, is characterized in that, comprising: PTC electric heating tube, and the first end of described PTC electric heating tube is provided with the first insulating end and for described PTC electric heating tube being mounted to the first mounting panel that evaporator is connected with described first insulating end; Second end of described PTC electric heating tube is provided with controller, the power line be electrically connected with described controller, the second insulating end and the second mounting panel be connected with described second insulating end, and is arranged on the elastic parts on described second insulating end.
2. PTC electric heater unit according to claim 1, is characterized in that,
Described first mounting panel is provided with installing hole;
Internal thread is provided with in described installing hole.
3. PTC electric heater unit according to claim 1, is characterized in that,
Also comprise: be arranged in parallel with described PTC electric heating tube, and the cross-brace beam be connected with described first insulating end and described second insulating end injection moulding, be arranged in the middle part of described cross-brace beam, the longitudinal carrier be simultaneously connected with described cross-brace beam and described PTC electric heating tube.
4. PTC electric heater unit according to claim 3, is characterized in that,
The cross sectional shape of described cross-brace beam is U-shaped;
Described cross-brace beam offers multiple air-flow openings.
5. PTC electric heater unit according to claim 1, is characterized in that,
Described elastic parts adopts the mode of injection moulding to be connected with described second insulating end.
6. PTC electric heater unit according to claim 1, is characterized in that,
Described PTC electric heating tube is provided with radiator and electric heater; Described electric heater comprises shell and is built in the ceramic PTC electric heater in described shell.
7. PTC electric heater unit according to claim 6, is characterized in that,
Described ceramic PTC electric heater has multiple ceramic PTC electric heating unit, ceramic PTC electric heating unit described in each includes at least a slice potsherd and PTC sheet, PTC sheet two ends in ceramic PTC electric heating unit described in each scribble silver-colored conductive electrode, battery lead plate is provided with the PTC sheet of each unit is in parallel at the PTC sheet two ends scribbling silver-colored conductive electrode, between described battery lead plate and described shell, be provided with insulating paper, described shell is contained in described radiator.
8. PTC electric heater unit according to claim 6, is characterized in that,
Described shell is aluminum pipe;
Described radiator is aluminium heat sink strip, and in wavy and have Teflon dope layer along the surface attachment of radiator described in described shell longitudinal extension;
Described aluminum pipe and described radiator are fixed as one by silica gel or fine weldering.
9. PTC electric heater unit according to claim 7, is characterized in that,
Between described battery lead plate and described potsherd, and be coated with between the silver-colored conductive electrode at described battery lead plate and described PTC sheet two ends and be brushed with silica gel;
Silica gel is filled with in the chamber of the described battery lead plate outside described aluminum pipe two ends;
Described battery lead plate outside described aluminum pipe two ends is connected with terminal.
10., with an air conditioner for PTC electric heater unit, it is characterized in that,
Air conditioner comprises: PTC electric heater unit and evaporator;
Described evaporator comprises: evaporator body, be arranged on described evaporator body left end, connect plastics first member plate and the panel beating first member plate of described PTC electric heater unit first mounting panel, for the screw making described PTC electric heater unit first mounting panel be threaded with described plastics first member plate, and be arranged on the panel beating right end plate of described evaporator body right-hand member;
Described panel beating right end plate is provided with the installation position for installing described PTC electric heater unit second insulating end, described installation position and elastic parts offset, for making described elastic parts compression, eliminate the joint gap of described PTC electric heater unit and described evaporator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410766281.1A CN104540252A (en) | 2014-12-11 | 2014-12-11 | PTC electric heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410766281.1A CN104540252A (en) | 2014-12-11 | 2014-12-11 | PTC electric heating device |
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| CN104540252A true CN104540252A (en) | 2015-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410766281.1A Pending CN104540252A (en) | 2014-12-11 | 2014-12-11 | PTC electric heating device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104994606A (en) * | 2015-07-07 | 2015-10-21 | 芜湖华族实业有限公司 | Positive temperature coefficient thermistor heater without any abnormal sound |
| CN105828464A (en) * | 2016-05-17 | 2016-08-03 | 珠海格力电器股份有限公司 | Ceramic PTC electric heater and air conditioner |
| CN106595135A (en) * | 2016-11-25 | 2017-04-26 | 广州松下空调器有限公司 | Heater mounting method, evaporator and air conditioner thereof |
| CN107504664A (en) * | 2017-08-18 | 2017-12-22 | 广东美的制冷设备有限公司 | Electric heater component and air conditioner |
| CN111609531A (en) * | 2020-05-06 | 2020-09-01 | 海信（山东）空调有限公司 | Power calculation method, indoor electric control board and air conditioner |
| EP3936792A1 (en) * | 2020-07-07 | 2022-01-12 | Beijing Xiaomi Mobile Software Co., Ltd. | Evaporator with auxiliary heating device and air conditioner |
| CN118066699A (en) * | 2024-04-18 | 2024-05-24 | 厦门宝益科技有限公司 | Liquid cooling plate integrated PTC heater with self-speed regulation of internal circulation medium |
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| CN104994606A (en) * | 2015-07-07 | 2015-10-21 | 芜湖华族实业有限公司 | Positive temperature coefficient thermistor heater without any abnormal sound |
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| EP3936792A1 (en) * | 2020-07-07 | 2022-01-12 | Beijing Xiaomi Mobile Software Co., Ltd. | Evaporator with auxiliary heating device and air conditioner |
| CN118066699A (en) * | 2024-04-18 | 2024-05-24 | 厦门宝益科技有限公司 | Liquid cooling plate integrated PTC heater with self-speed regulation of internal circulation medium |
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Application publication date: 20150422 |