CN207099345U - Warmer and surface insulation type PTC electric heaters - Google Patents

Warmer and surface insulation type PTC electric heaters Download PDF

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Publication number
CN207099345U
CN207099345U CN201720789235.2U CN201720789235U CN207099345U CN 207099345 U CN207099345 U CN 207099345U CN 201720789235 U CN201720789235 U CN 201720789235U CN 207099345 U CN207099345 U CN 207099345U
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China
Prior art keywords
electrode piece
electric heaters
insulation type
metal level
ptc
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CN201720789235.2U
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Chinese (zh)
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赵诚
徐朋
杜文波
刘云艳
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Midea Group Co Ltd
GD Midea Environment Appliances Manufacturing Co Ltd
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Midea Group Co Ltd
GD Midea Environment Appliances Manufacturing Co Ltd
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Abstract

The utility model discloses a kind of warmer and surface insulation type PTC electric heaters.Surface insulation type PTC electric heaters include PTC fever tablets and the first electrode piece and second electrode piece that are connected in the PTC fever tablets;Cladding is wrapped around in the entirety of the first electrode piece, PTC fever tablets and second electrode piece and is provided with insulating heat-conductive coating, and metal level is provided with the outside of the insulating heat-conductive coating, radiating fin is provided with the outside of the metal level.The utility model both can guarantee that electric heater surface was not charged, and and can gives full play to PTC fever tablet efficiency, and compact-sized, small volume is cheap.In addition, metal level can effectively reduce risk of the insulating heat-conductive coating by mechanical failure.

Description

Warmer and surface insulation type PTC electric heaters
Technical field
It the utility model is related to PTC technical field of heating, more particularly to a kind of warmer and surface insulation type PTC electric heating Device.
Background technology
PTC (Positive Temperature Coefficient, positive temperature coefficient) electric heaters are made using PTC-ceramic piece For heater element, compared with traditional heating wire, electrothermal tube, far infrared quartz electric heater, possesses automatic temperature-controlled characteristic, and there is nothing The advantages that naked light, safe and reliable, long lifespan, it is widely used in Centralized Air-conditioning in Public Buildings, air curtain, warm-air drier, dryer, dehumidifying are dried Dry machine, drying room equipment, the heating of large scale industry air channel, engine electric heating, electric automobile heating system, small household appliances, switch board add The fields such as hot protection against the tide.
It can be the powered type in surface and surface insulated two kinds that PTC electric heaters, which are divided to,.For the powered type PTC electric heaters in surface, its PTC pieces are directly connected with radiating aluminum strip.For surface insulation type PTC electric heaters, typically wrapped up using polyimide insulative film PTC fever tablets and electrode slice form heat generating component, and then heat generating component is positioned in aluminum casing and compresses aluminum pipe, sends out PTC Backing and electrode slice are combined closely with aluminum pipe, are finally connected aluminum pipe with radiating aluminum strip.
For the surface insulation type PTC electric heaters of the structure, due to having used aluminum pipe, cause PTC fever tablet heats Difficulty distributes, therefore can not give full play to PTC fever tablet power, and PTC fever tablet monolithic powers utilization rate declines more than 30%, to reach To type PTC electric heaters equal-wattage powered with surface requirement, PTC fever tablets usage quantity need to increase by more than 30%;Correspondingly, dissipate Hot aluminum strip usage quantity increase by more than 30%, whole PTC electric heaters volume increase more than 30%, ultimately results in surface insulation type PTC electric heater volumes are big, cost is high.In addition, the polyimide insulative layer in surface insulation type PTC electric heaters be not direct zero away from From being bonded on electrode slice and aluminum pipe, a layer of air thin layer can be formed, the thermal conductivity of heating unit assembly is reduced, reduce further The thermal efficiency of PTC electric heaters.
Therefore, how to provide a kind of power utilization height, small volume, cost low surface insulation type PTC electric heaters, be this Art personnel technical problem urgently to be resolved hurrily.
Utility model content
Main purpose of the present utility model is to provide a kind of surface insulation type PTC electric heaters, it is intended to solves in the prior art The problem of power utilization is low.
To achieve the above object, the utility model proposes surface insulation type PTC electric heaters, including PTC fever tablets and company The first electrode piece and second electrode piece being connected in the PTC fever tablets, the first electrode piece and the second electrode piece position In the opposite sides of the PTC fever tablets;In the overall outer side ring of the first electrode piece, PTC fever tablets and second electrode piece Wrapped cover is equipped with insulating heat-conductive coating, and metal level is provided with the outside of the insulating heat-conductive coating, is set on the outside of the metal level It is equipped with radiating fin.
Preferably, the metal level is wound on the outside of the insulating heat-conductive coating by sheet metal and formed.
Preferably, the metal level is aluminium lamination or layers of copper.
Preferably, the thickness of the metal level is 30 μm~150 μm.
Preferably, it is provided with heat conduction articulamentum between the metal level surface relative with the radiating fin.
Preferably, the first electrode piece and the second electrode piece are polygonized structure.
Preferably, the first electrode piece and the second electrode piece are string configuration, the insulating heat-conductive coating In the rectangular cross-section structure of length direction.
Preferably, first is provided between the first electrode piece surface relative with the PTC fever tablets to be conductively connected Layer.
Preferably, second is provided between the second electrode piece surface relative with the PTC fever tablets to be conductively connected Layer.
The utility model also provides a kind of warmer, and the warmer includes housing, accommodation space is formed in the housing, Any one of foregoing surface insulation type PTC electric heaters are provided with the accommodation space.
Surface insulation type PTC electric heaters of the present utility model, using insulating heat-conductive coating around be coated on first electrode piece, The overall outside of PTC fever tablets and second electrode piece, without using aluminum pipe of the prior art and Kapton, due to exhausted It is tightly combined between edge heat conducting coating and electrode slice and PTC fever tablets, and does not have thin layer of air, therefore had both can guarantee that electric heater table Face is not charged, and and can gives full play to PTC fever tablet efficiency, and compact-sized, small volume is cheap.Further, since led in insulation Metal level is provided with the outside of hot coating, the metal level can effectively reduce risk of the insulating heat-conductive coating by mechanical failure.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only It is some embodiments of the utility model, for those of ordinary skill in the art, is not paying the premise of creative work Under, other accompanying drawings can also be obtained according to the structure shown in these accompanying drawings.
Fig. 1 is the sectional view of the surface insulated PTC electric heaters of the embodiment of the utility model one;
Fig. 2 is the structural representation of the surface insulated PTC electric heaters of another embodiment of the utility model;
Fig. 3 is the flow chart of the preparation method of the surface insulation type PTC electric heaters of embodiment illustrated in fig. 1.
Drawing reference numeral explanation:
Label Title Label Title
100 PTC fever tablets 201 First electrode piece
202 Second electrode piece 300 Insulating heat-conductive coating
400 Metal level 500 Radiating fin
401 Heat conduction articulamentum 211 First conductive tie layers
221 Second conductive tie layers
Realization, functional characteristics and the advantage of the utility model purpose will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out Clearly and completely describing, it is clear that described embodiment is only part of the embodiment of the present utility model, rather than all Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative work premise Lower obtained every other embodiment, belong to the scope of the utility model protection.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute in the utility model embodiment It is only used for explaining relative position relation under a certain particular pose (as shown in drawings) between each part, motion conditions etc., such as When the fruit particular pose changes, then directionality instruction also correspondingly changes therewith.
In addition, and it can not be managed in the utility model such as relating to the description of " first ", " second " etc. is only used for describing purpose Solve to indicate or implying its relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define " the One ", at least one this feature can be expressed or be implicitly included to the feature of " second ".It is " more in description of the present utility model It is individual " it is meant that at least two, such as two, three etc., unless otherwise specifically defined.
In the utility model, unless otherwise clearly defined and limited, term " connection ", " fixation " etc. should do broad sense reason Solution, for example, " fixation " can be fixedly connected or be detachably connected, or integrally;Can mechanically connect, also may be used Be electrical connection;Can be joined directly together, can also be indirectly connected by intermediary, can be the connection of two element internals Or the interaction relationship of two elements, limited unless otherwise clear and definite.For the ordinary skill in the art, can be with Concrete meaning of the above-mentioned term in the utility model is understood as the case may be.
In addition, the technical scheme between each embodiment of the utility model can be combined with each other, but must be with ability Domain those of ordinary skill can be implemented as basis, will be understood that when the combination appearance of technical scheme is conflicting or can not realize The combination of this technical scheme is not present, also not within the protection domain of the requires of the utility model.
Referring to Fig. 1, the utility model embodiment provides a kind of surface insulated PTC electric heaters, generated heat including at least PTC Piece 100, first electrode piece 201, second electrode piece 202, insulating heat-conductive coating 300, metal level 400 and radiating fin 500.First Electrode slice 201 and second electrode piece 202 are connected in PTC fever tablets 100, and can be located at the opposite sides of PTC fever tablets 100. In the orientation shown in Fig. 1, first electrode piece 201 is located at the upside of PTC fever tablets 100, therefore also referred to as " Top electrode piece ";Second Electrode slice 202 is located at the downside relative with first electrode piece 201, therefore also referred to as " bottom electrode piece ".First electrode piece 201 and second One of them of electrode slice 202 can be used as positive pole, and another can be used as negative pole, and the work of PTC fever tablets 100 is may be such that after being powered Make.
Stainless iron, stainless steel, copper, silver, aluminium and electrically conductive graphite etc. can be selected in first electrode piece 201 and second electrode piece 202 Material.Ceramic heating element, such as BaTiO may be selected in PTC fever tablets 1003It it is 220~315 DEG C Deng, its curie point, when PTC fever tablets 100 temperature exceedes curie point, and resistance value increases exponentially, and supply voltage is constant, and electric current is obviously reduced and causes power therewith Reduce, and then heating reduction final temperature is again constant at curie point, the PTC fever tablets 100 have automatic constant-temperature performance, no Special temperature controller and thermal resistance galvanic couple equitemperature sensor is needed to carry out feedback and can carry out computer heating control.
First electrode piece 201 and second electrode piece 202 are polygonized structure, can be such as trapezoidal, square, rhombuses Structure.Further, first electrode piece 201 and second electrode piece 202 are preferably all string configuration (as being similar to ruler-shaped Shape), PTC fever tablets 100 are held on centre.The quantity of PTC fever tablets 100 can be multiple, and arranged for interval is in first electrode Between piece 201 and second electrode piece 202.
The embodiment wraps around cladding in the entirety of first electrode piece 201, PTC fever tablets 100 and second electrode piece 202 Insulating heat-conductive coating 300 is provided with, on the one hand the insulating heat-conductive coating 300 can play a part of electric insulation, on the other hand can incite somebody to action The heat that PTC fever tablets 100 are sent when working, which transfers out, to be come.
300 optional modified resin of insulating heat-conductive coating, polyimides, alumina layer, magnesium oxide layer, aluminium nitride, gold oxide Belong to beryllium etc., preferably modified resin.The insulating heat-conductive coating 300 can be preferably by spraying, brushing, the mode such as printing and formed Spraying.In addition, 10 μm~200 μm of the thickness of the insulating heat-conductive coating 300, the insulating heat-conductive coating 300 of the thickness can play Effective insulating heat-conductive effect, also can guarantee that manufacturing cost is relatively low.
It should be noted that the integral coating of insulating heat-conductive coating 300 in first electrode piece 201, PTC fever tablets 100 and The outside of second electrode piece 202, in the sectional view shown in Fig. 1, the insulating heat-conductive coating 300 is closed loop configuration.In addition, first The lead of electrode slice 201 and second electrode piece 202 needs guiding through the insulating heat-conductive coating 300, in order to be connected with external circuit.More Specifically, insulating heat-conductive coating 300 length direction rectangular cross-section structure, to substitute rectangle aluminum pipe of the prior art, And without using Kapton.In addition, the intersection on each side of rectangular configuration can also form arc transition.Certainly, lead to Special technique is crossed it is also possible that the rectangular configuration forms right angle transition.
Further, the outside of insulating heat-conductive coating 300 is provided with metal level 400, the metal level 400 is led positioned at insulation The outside of hot coating 300, because metal level 400 has preferably mechanical strength, therefore can be pointed to the insulating heat-conductive on the inside of it Coating 300 plays a protective role, and effectively reduces risk of the insulating heat-conductive coating 300 by mechanical failure, is not in because insulation is led Hot coating 300 is damaged and influences the situation of insulating properties.
The metal level 400 may be disposed at the side of insulating heat-conductive coating 300 or a few sides, and preferably its integral coating is led in insulation The outside of hot coating 300.In addition, 400 optional aluminium lamination of metal level or layers of copper, preferably aluminium lamination, it is easy to that cladding, thermal conductivity be good and cost Low, thickness is 30 μm~150 μm.The metal level 400 can be formed at the outside of insulating heat-conductive coating 300 by kinds of processes, such as The modes such as vacuum splashing and plating.Preferred metal layers 400 are wound on the outside of insulating heat-conductive coating 300 by sheet metal (such as aluminium paper) And formed.In addition, the processes such as consolidation can also be carried out after the completion of winding.
The outside of metal level 400 is provided with radiating fin 500, and the radiating fin 500 is the radiating end of PTC electric heaters, its With larger specific surface area, heat exchange can be carried out with extraneous air.Radiating fin 500 can use a variety of possible materials and knot Configuration formula, preferably radiating fin 500 are radiatinig corrugated aluminum strip.Needs, radiating fin 500 are arranged according to the space of PTC electric heaters It may be disposed at the one or both sides of metal level 400.In the embodiment shown in fig. 1, radiating fin 500 includes upper fin with Fin, heat transference efficiency is higher, radiating effect is more preferable.
The surface insulation type PTC electric heaters of previous embodiment, without thin using aluminum pipe of the prior art and polyimides Film, due to being tightly combined between insulating heat-conductive coating 300 and electrode slice and PTC fever tablets 100, and there is no thin layer of air, therefore Both it can guarantee that electric heater surface was not charged, it is safe to use;And can gives full play to the efficiency of PTC fever tablets 100, compact-sized, volume It is small, it is cheap.Further, since being provided with metal level 400 in the outside of insulating heat-conductive coating 300, the metal level 400 can be effective Reduce risk of the insulating heat-conductive coating 300 by mechanical failure.It is additionally, since between insulating heat-conductive coating 300 and radiating fin 500 It is spaced by metal level 400, the risk also immersed without colloid inside radiating fin 500.
Can be by being mechanically fixed connection, preferably in metal level 400 and radiating fin between metal level 400 and radiating fin 500 Piece 500 is provided with heat conduction articulamentum 401 between relative surface, and the heat conduction articulamentum 401 is chosen as silica gel or resin (further Can also be organic silica gel and modified resin).Preferably silica gel, can be by between metal level 400 and radiating fin 500 by the silica gel Bonding.The thickness of heat conduction articulamentum 401 is 1 μm~50 μm.Embodiment shown in corresponding diagram 1, in upper fin and metal level 400 Between upper heat conduction articulamentum, heat conduction articulamentum under being set between lower fin and metal level 400 are set.
Similarly, between first electrode piece 201 and PTC fever tablets 100, second electrode piece 202 and PTC fever tablets 100 it Between also can use be mechanically fixed connection.Preferably, it is provided between first electrode piece 201 and the relative surface of PTC fever tablets 100 First conductive tie layers 211;Second is provided between second electrode piece 202 and the relative surface of PTC fever tablets 100 to be conductively connected Layer 221.Specifically, the first conductive tie layers 211 be located at the lower surface of first electrode piece 201 and the upper surface of PTC fever tablets 100 it Between, the second conductive tie layers 221 are located between the upper surface of second electrode piece 202 and the lower surface of PTC fever tablets 100.
First conductive tie layers 211 and the one side of the second conductive tie layers 221 play the effect of conduction, by electrode slice Electric current is conducted to PTC fever tablets 100, in order to its heating power;On the other hand, each conductive tie layers also function to each electricity of bonding Pole piece and the effect of PTC fever tablets 100.First conductive tie layers 211 and the second conductive tie layers 221 are chosen as silica gel or resin (can also be further organic silica gel and modified resin), it is however preferred to have the silica gel of electric conductivity.In addition, the first conductive tie layers 211 and second the thickness of conductive tie layers 221 select as 1 μm~50 μm.
Fig. 2 is the structural representation of the surface insulated PTC electric heaters of another embodiment of the utility model, and it is by foregoing reality The structures to form for applying example forms multiple rows of, and is parallel to each other between each row, the structure heating power that this is spliced to form is big, especially suitable In being used in warm-air drier.It can be fixed between each row by bonding or mechanical system.In fig. 2 it is seen that positioned at outermost Metal level 400 and radiating fin 500, insulating heat-conductive coating 300, first electrode piece 201, second electrode piece 202 positioned at inner side And PTC fever tablets 100 are invisible.
The utility model also provides a kind of warmer, and the warmer includes housing, accommodation space is formed in the housing, The surface insulation type PTC electric heaters of previous embodiment are provided with the accommodation space.The tool of the surface insulation type PTC electric heaters Body structure is with reference to above-described embodiment, because this warmer employs whole technical schemes of above-mentioned all embodiments, therefore at least With all beneficial effects caused by the technical scheme of above-described embodiment, this is no longer going to repeat them.
Referring to Fig. 3, the preparation method of previous embodiment surface insulation type PTC electric heaters comprises the following steps:
Step S10:First electrode piece 201 and second electrode piece 202 are adhered in PTC fever tablets 100;
First electrode piece 201 can be adhered in PTC fever tablets 100 by the first conductive tie layers 211, second electrode piece 202 can be adhered in PTC fever tablets 100 by the second conductive tie layers 221, and can be by first electrode piece 201 and second electrode Piece 202 is adhered to the opposite sides of PTC fever tablets 100.First conductive tie layers 211 and the second conductive tie layers 221 are chosen as Silica gel or resin (can also be further organic silica gel and modified resin), it is however preferred to have the silica gel of electric conductivity.The side of bonding The optional brushing of formula, printing, solidification temperature are 150 DEG C~250 DEG C, and hardening time is 30min~80min.In addition, may be used also after bonding The process for being compressed and being solidified.
Step S20:Cladding is wrapped around in the entirety of first electrode piece 201, PTC fever tablets 100 and second electrode piece 202 Insulating heat-conductive coating 300;
300 optional modified resin of insulating heat-conductive coating, polyimides, alumina layer, magnesium oxide layer, aluminium nitride, gold oxide Belong to beryllium etc., and can be by spraying, brushing, the mode such as printing and be coated on first electrode piece 201, PTC fever tablets 100 and second electrode The overall outside of piece 202.It is preferred that insulating heat-conductive coating 300 is modified resin, and first electrode piece is coated on by spraying to surround 201st, the overall outside of PTC fever tablets 100 and second electrode piece 202.Curing process condition is 50 DEG C~300 DEG C of solidification temperature, Hardening time is 30min~60min.
Step S30:In the outside of insulating heat-conductive coating 300 winding metal level 400;
400 optional aluminium lamination of metal level or layers of copper, preferably aluminium lamination, are wound on insulating heat-conductive coating 300 by aluminium paper Outside and form aluminium lamination.In addition, the processes such as consolidation can be also carried out after the completion of winding.
Step S40:In the outer side bonds radiating fin 500 of metal level 400.
Radiating fin 500 can be adhered to the outside of metal level 400 by heat conduction articulamentum 401, and the heat conduction articulamentum 401 is optional For silica gel or resin (can also be further organic silica gel and modified resin), preferably silica gel.The optional brushing of mode of bonding, print Brush, solidification temperature are 150 DEG C~250 DEG C, and hardening time is 30min~80min.In addition, also it can be compressed and be consolidated after bonding The process of change.
The preparation method of previous embodiment surface insulation type PTC electric heaters, without using parcel polyimide insulative film And the process for compressing aluminum pipe is arranged, strong operability, production efficiency is high, and manufacturing cost is low.
Preferred embodiment of the present utility model is the foregoing is only, not thereby limits the scope of the claims of the present utility model, Every equivalent structure transformation under design of the present utility model, made using the utility model specification and accompanying drawing content, or Directly/be used in other related technical areas indirectly and be included in scope of patent protection of the present utility model.

Claims (10)

1. a kind of surface insulation type PTC electric heaters, it is characterised in that including PTC fever tablets and be connected in the PTC fever tablets First electrode piece and second electrode piece;Wrapped around in the entirety of the first electrode piece, PTC fever tablets and second electrode piece Cladding is provided with insulating heat-conductive coating, and metal level is provided with the outside of the insulating heat-conductive coating, is set on the outside of the metal level There is radiating fin.
2. surface insulation type PTC electric heaters according to claim 1, it is characterised in that the metal level is by sheet metal It is wound on the outside of the insulating heat-conductive coating and is formed.
3. surface insulation type PTC electric heaters according to claim 1, it is characterised in that the metal level is aluminium lamination or copper Layer.
4. surface insulation type PTC electric heaters according to claim 1, it is characterised in that the thickness of the metal level is 30 μ M~150 μm.
5. surface insulation type PTC electric heaters according to claim 1, it is characterised in that the metal level and the radiating Fin is provided with heat conduction articulamentum between relative surface.
6. surface insulation type PTC electric heaters according to claim 1, it is characterised in that the first electrode piece and described Second electrode piece is polygonized structure.
7. surface insulation type PTC electric heaters according to claim 6, it is characterised in that the first electrode piece and described Second electrode piece is string configuration, rectangular cross-section structure of the insulating heat-conductive coating in length direction.
8. the surface insulation type PTC electric heaters according to claim any one of 1-7, it is characterised in that the first electrode Piece is provided with the first conductive tie layers between the surface relative with the PTC fever tablets.
9. the surface insulation type PTC electric heaters according to claim any one of 1-7, it is characterised in that the second electrode Piece is provided with the second conductive tie layers between the surface relative with the PTC fever tablets.
10. a kind of warmer, it is characterised in that the warmer includes housing, and accommodation space, the appearance are formed in the housing The surface insulation type PTC electric heaters described in claim any one of 1-9 are provided with being empty.
CN201720789235.2U 2017-06-29 2017-06-29 Warmer and surface insulation type PTC electric heaters Active CN207099345U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107270380A (en) * 2017-06-29 2017-10-20 广东美的环境电器制造有限公司 Warmer, surface insulation type PTC electric heaters and preparation method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107270380A (en) * 2017-06-29 2017-10-20 广东美的环境电器制造有限公司 Warmer, surface insulation type PTC electric heaters and preparation method thereof

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