CN210112299U - Assembly of PTC heating device and contain its electrical apparatus - Google Patents

Abstract

The utility model discloses a PTC heating device's sub-assembly the laminating of second cavity radiator tip heat radiation surface's wall thickness department holds and fixes a position temperature controller and temperature fuse's little pot body in addition. The utility model discloses temperature controller and temperature fuse are under the normal operating condition of heating, ventilation and the heating abnormal state that does not ventilate, and the difference of the temperature difference on its temperature sensing surface is obvious different. Namely: when the fan motor breaks down to cause the PTC heater to be in an abnormal working state without air dry burning, the temperature difference between the temperature controller and the temperature fuse which are positioned on the surface of the bracket and the temperature difference under the working states of ventilation and heating are more obvious, and the protection can be effectively and instantly disconnected under the state of the dry burning state without ventilation.

Description

Assembly of PTC heating device and contain its electrical apparatus

Technical Field

The utility model relates to a thermal sensitive ceramic heater, in particular to a combined piece of a PTC heating device.

Background

A support for a PTC thermal sensitive ceramic electric heater and the PTC electric heater (publication No. CN201174784) comprise a mounting surface and a supporting surface, wherein a concave cavity for mounting and fixing a heating body is arranged on the supporting surface, the bottom of the concave cavity is also provided with a cavity which extends inwards and is used for placing a power supply leading-out end connecting wire of the heating body, and a wire leading-out hole is arranged on the supporting surface at the bottom of the cavity. And a through hole for placing the fuse is arranged on one side wall of the supporting surface.

Through this technical scheme can reach and combine the fuse in the support and prevent that it from connecting in the support periphery and influencing the security, but because it still installs on a lateral wall of holding surface, its connecting wire still can twine in the support outside, and the power lead still has the hidden danger that becomes flexible, drops under the exogenic action.

A PTC heater supporting seat and a PTC heater (publication number: CN200920235929) comprise a seat body, a cover plate and a screw; the base body is fixedly connected with the cover plate through screws; a cavity with an opening on one side is arranged in the seat body, and an upper spacing wall and a lower spacing wall are arranged in the cavity; the upper wall of the interval is positioned between the heating body of the PTC heater and the temperature controller; the lower wall of the interval is positioned between the heating body of the PTC heater and the temperature fuse.

Can install temperature controller and temperature fuse in the support through this technical scheme, solve the reliability problem of temperature controller and fuse location. However, the lead-out wires are easy to loosen and fall off under the repeated pulling of external force, and the electrified parts of the connecting surfaces of the two electrode plates and the wire group with different polarities also cause short circuit and contact sparking or loosening caused by poor crimping.

The PTC heater (publication number: 104053255A) shares a tailstock and an electrical appliance connecting seat with more than two heaters, and a temperature controller and a temperature fuse are fixed in the electrical connecting seat of a bare circuit and then are inserted into an electrical plug cavity and an electrical screen connecting seat cover. The technology can solve the problem of positioning of the temperature controller and the fuse in the tail seat of the electric connecting seat, but can still not solve the problems of safety and reliability in the aspects of displacement, mutual interference and the like between parts in the support seat body and between power supply leads.

Above-mentioned prior art all has thermal ceramic heater power connecting wire to draw back and does not have effectual insulating fixed, easily receives to draw the impression, and the problem that the inside power connecting wire of installing support also easily receives the outside influence of drawing simultaneously.

In addition, the existing thermal sensitive ceramic heater for the cabinet air conditioner adopts a single group or multiple groups of materials connected in parallel, the power connecting wires of the thermal sensitive ceramic heaters are mutually interfered and are not effectively insulated and fixed after being led out, and the thermal sensitive ceramic heaters are easily subjected to falling and short-circuit safety accidents caused by the influence of the assembly, transportation and drawing of the whole machine.

An electric PTC liquid heater (publication No. CN2612898Y), wherein the power line is connected with the electrode and supplies power to the electrode, and the power line is connected with the outside through the power line inlet of the metal shell.

By adopting the technical scheme, the power line is directly connected with the electrode, so that the contact resistance is large, and the connection point of the power line is easy to fall off under the action of external force.

A PTC heating quick electric water heater (publication No. CN2742335Y) has a lead wire connected to an insert on a heating device.

By adopting the technical scheme, the safety of the PTC heater can be ensured only by completing the connection of the lead and the PTC electrode plate under the help of the inserting piece, the inserting spring and the sheath, meanwhile, the inserting piece is very high in inserting requirement, and if the inserting piece is not connected with the conjunction part of the inserting piece, the inserting piece is easy to fall off from the PTC electrode plate, so that the heater is damaged.

A PTC heating element (publication No. CN2684506Y) having a fastening terminal, wherein a cramp is provided on the terminal, and the cramp is connected to an electrode plate by punching. By adopting the technical scheme, the buckle sheet is equivalent to an inserting sheet, the distance of stamping needs to be adjusted in real time, the butt joint of the inserting sheet and the inserting spring is difficult to avoid contact gaps, if the connecting part is not connected with the conjunction part, the inserting sheet is easy to fall off from the PTC electrode sheet or the butt joint inserting spring to cause that the heater is not conducted, and the real-time adjustment needs to be carried out by more workers, thus the cost is increased.

In addition, the prior art also adopts a connection scheme of stamping a connecting sheet with a flanging pressing surface or a wrap angle pressing surface and an electrode sheet of a heating strip, although the scheme can solve the problem of reliable pressing of a line group and the connecting sheet, the flanging pressing surface or the wrap angle pressing surface and the electrode sheet are in surface contact and slightly uneven in mutual fit, the matching is easy to loose, and the loosening is caused. In addition, the plane punch of the punching die simultaneously applies impact pressure to two sides of the flanging or the wrap angle, and because the contact positions of the electrode plate and the two sides of the flanging or the wrap angle are in line contact, indentation is also concentrated on the contact positions, and the punching die has slight unevenness, the electrode plate can be damaged and broken on the indentation line, and the whole set of heating strips and wire sets can be scrapped.

In summary, the following steps: the connection mode of the power line and the electrode plate in the prior art has various potential safety and reliability hazards such as poor contact, loose compression joint, damaged stamping and the like.

The prior art is as follows: conductive adhesive is arranged between the heating sheet and the electrode plate, and the adhesive strength of the adhesive is greatly reduced because the conductive adhesive contains a large amount of metal conductive powder. 2. The silica gel which is rapidly and naturally solidified at room temperature is used, the production and storage cost is high, and the use is inconvenient. 3. The existing heating core forms a lateral groove after rolling pressure, and has positive effects of improving the contact between a heating element and an electrode plate and the heating surface of an aluminum tube and improving the heat efficiency.

The prior art has the following defects: 1, new industry CN 00221004: (1) although various insertion modes such as forward, backward, leftward or rightward insertion modes are set, the temperature-control temperature-sensing surface is required to be tightly attached to a radiating strip with an electrified surface, so that safety accidents such as short circuit and electric leakage are easy to occur, and the temperature-control temperature-sensing surface is unreliable and difficult to operate and install. (2) The two jacks for temperature control and fusing respectively penetrate into the inner wall of the concave cavity of the bracket, so that the power supply lead and the electric connection point can only be exposed outside the bracket. (3) The cover plate is only used for supporting the positioning function of the temperature controller, the problem that the connection point of the electrified part is exposed cannot be solved, and great hidden danger of safety and reliability in use is brought. 2, xuchengdong CN 201420064071: the cover plate that sets up exposes in the space on support surface, leads to the water droplet seepage easily to fix a position the hidden danger of security in the cavity of control by temperature change and fuse. 3, national power 200920235929: (1) the temperature control is positioned in the cavity of the bracket seat body, the temperature change of the temperature sensing surface of the temperature controller under the ventilation working state of the heating device and the difference of the dry burning state when the temperature is abnormal are not obvious, and the temperature of the temperature sensing surface can reach the protection temperature only by long recovery time. (2) The temperature difference between the ventilation state and the dry-burning state is not obvious, and the malfunction is easily caused. (3) The temperature control cavity is arranged in the seat body of the bracket, the occupied space is large, the interference of power lines and connecting points among different polarities in the cavity of the seat body is easily caused, and major safety accidents such as short circuit or creepage and the like occur.

1. National patents CN204741574U and CN 104797015A: (1) the cover plate is not provided with an extension surface and a wire harness of the second through hole (2) is not provided with a sealing ring, the wire harness is positioned by binding, and the looseness is easy and the reliability is not high.

The prior art is as follows: (1) and no sealant is arranged in the cavity of the tail support, so that condensed water generated by cold and hot shock of the ambient temperature is easily leaked into the tail aluminum tube heating element during working to cause short circuit. (2) Linzhi CN302536477S, the afterbody has unsealed step, can't hold sealed glue. (3) The tail of the aluminum tube heating body is flush with the radiator or lower than the tail of the radiator.

The prior art is as follows: lattice force CN 20101024587: (1) all power supply contacts are exposed on the surface of the bracket, the problem of electric leakage in sealing and use in a wet state cannot be solved, and the use is unsafe. (2) The joint of the bracket and the heater has no chamfer or groove, (3) the joint has no sealant, the gap of the joint is easy to seep water, the sealing performance can not be ensured, the problems of water seepage and electric leakage in the use in the moisture environment can not be solved, and the use is unsafe.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model aims to solve the problem of the intraductal heat-generating body of current PTC heating device in the start-up of frequent work ~ heat-shut-down cooling and lead to the not hard up clearance between intraductal heating element and the conductive electrode and the insulating layer and the common jump fire between heating element and the electrode slice because of contact gap from this between the clearance of the heat stress release that leads to because of cold and hot shock in the twinkling of an eye in the cooling, carbonization and even cause the insulating layer to melt the surface electrification and the electric leakage that produce because of the local high temperature that leads to jumping fire for a long time, short circuit and puncture, the explosion, burn a series of great and malignant safety accidents such as inflammable plastic's indoor set.

The technical scheme is as follows: a combined piece of a PTC heating device comprises a PTC heater, a first mounting bracket, a second mounting bracket and a leading-in power wire harness, wherein the PTC heater and the first mounting bracket and the second mounting bracket are composed of a PTC heating core, a heat-conducting aluminum pipe and a radiator, the leading-in power wire harness is connected with a temperature controller and a temperature fuse, the heating core is provided with a first electrode strip and a second electrode strip which comprise electric conduction surfaces and heat conduction surfaces, a plurality of PTC heating sheets clamped by the heat conduction surfaces of the electrode strips in parallel, temperature-resistant insulating silica gel positioned between the PTC heating sheets and the heat conduction surfaces of the electrode strips and a temperature-resistant insulating film coating the electrode strips clamping the PTC heating element, the first mounting bracket is provided with a base body and a sealing cover, the base body is provided with a leading-out end for containing the electrode strips with different polarities of the heating device and an electric connection part of the leading-in power wire harness as well as a, The second cavity of the end part of the radiator of the heating device is attached to the wall thickness of the radiating surface of the end part of the radiator, a small pit body for accommodating and positioning a temperature controller and a temperature fuse is further arranged, and the depth of the small pit body is far smaller than the lengths of the temperature controller and the temperature fuse.

Further, the length of the open face of the small pit body is close to the length of the temperature controller and the length of the temperature fuse.

Furthermore, a positioning cavity groove for accommodating the fuse power supply lead is arranged on one side adjacent to the positioning wall of the small pit body for positioning the temperature fuse.

Furthermore, gaps which are communicated with the pit body and the positioning cavity groove are formed in the partition wall of the small pit body for accommodating the temperature fuse and the positioning cavity groove of the power lead of the adjacent temperature fuse, and the lead of the temperature fuse is embedded into the positioning cavity groove of the power lead and is positioned in the positioning cavity groove through the gaps.

The prior art is as follows: national Wei CN 201515508U. The disadvantages are as follows: 1. the temperature controller, the temperature fuse and the power wire harness connecting point are in the plane of the same cavity, the installation position and the space are small, power contacts and wires with different polarities are difficult to avoid interference, and the reliability and the safety have great hidden dangers. (2) The temperature difference between the ventilation state and the dry-burning state is not obvious, and the malfunction is easily caused. Utility model point: temperature controller and fuse location are in the corresponding cavity of another plane of heating device power lead-out end and electric connection pressure point, the power lead-out end of heater and the tie point of introducing power and temperature controller and fuse are all located the plane of big cavity, and the space of cavity is great, isolation, mutual noninterference that can be convenient between the power contact of different polarities and the wire, and structural optimization has brought the improvement and the promotion of security and reliability. Example (b): see the structure diagram of the oxgler force module. 2. Lattice force CN 102271429A. The prior art has the following defects: (1) the temperature control and the fuse are both positioned on the surface of the bracket base body, and a certain part of the temperature control and the fuse is exposed, so that when the temperature control and fuse are used in a humid and corrosive environment, a control device is easily polluted and corroded, and the failure is caused. (2) The power supply contact and the power supply lead of the electrified part are all positioned on the outer surface of the bracket base body, so that the power supply contact and the power supply lead are easy to age and reduce in insulation under the humid and corrosive environment to cause safety accidents. The utility model has the advantages that: (1) the temperature difference of the temperature sensing surfaces of the temperature controller and the temperature fuse is obviously different under the normal working state of heating and ventilation and the abnormal state of heating and non-ventilation. Namely: when the fan motor breaks down to cause the PTC heater to be in an abnormal working state without air dry burning, the temperature difference between the temperature controller and the temperature fuse which are positioned on the surface of the bracket and the temperature difference under the working states of ventilation and heating are more obvious, and the protection can be effectively and instantly disconnected under the state of the dry burning state without ventilation. (2) Because the temperature controller and the temperature fuse are directly radiated better by circulating natural wind in the ventilation working state, the misoperation caused by poor radiating effect of the temperature sensing surfaces of the temperature controller and the temperature fuse in the ventilation working state is reliably avoided. (3) Temperature controller and temperature fuse seal up inside the pedestal of installing support and laminate in PTC heating device's radiator surface, do not occupy the volume of end and power connection point place cavity is drawn forth to the internal electrode of first installing support pedestal, make have bigger installation space and separated between the different polarity power cord of control by temperature change and fuse and the tie point, the effectual sufficient creepage distance and the electric clearance of having guaranteed. (4) During assembly, the positioning and operating space of the power supply wire harness is obviously increased, the assembly efficiency is greatly improved, and the manufacturing cost is obviously reduced.

Furthermore, a positioning clamping groove for positioning power supply connecting wires with different polarities, which are connected with the input power supply, of the temperature controller and the temperature fuse is arranged in the large open cavity of the first support, and a partition wall for accommodating and fixing the power supply connecting wires is arranged on one side of the positioning clamping groove.

Furthermore, the peripheral wall openings of the side wall of the cavity at the joint of the second mounting bracket and the heating device of the insert sleeve are provided with chamfers or grooves.

Furthermore, the chamfer or the groove inclines or sinks towards the inner side contacting the tail end of the heating device, and sealant for completely filling gaps at the joint of the peripheral wall openings of the side wall of the bracket and the heating device is poured in the chamfer or the groove.

The utility model has the advantages that: make up the fit clearance between tail end heat-generating body and the radiator that leads to because of frock and human negligence in the device shaping solidification technology process, stop to cause the split glue between heat-generating body and the radiator from this, come unstuck, the bonding strength of assurance heater, assurance radiating effect and security and reliability. The safety and reliability of the heating device are improved.

Furthermore, the combined part is provided with a first mounting bracket, a second mounting bracket and a power supply wiring harness connected with a temperature controller and a temperature fuse, the first mounting bracket is provided with a seat body and a sealing cover, and chamfers or grooves are arranged at peripheral wall openings of the side wall of the cavity at the joint of the seat body and the leading-out end of the heating device for accommodating and positioning.

Furthermore, the chamfer or the groove is sunken towards one side contacting the heating device, and sealant for completely filling gaps at the joint of the peripheral wall openings of the side wall of the support and the heating device is poured into the chamfer or the groove.

The prior art is as follows: lattice force CN 20101024587: (1) all power supply contacts are exposed on the surface of the bracket, the problem of electric leakage in sealing and use in a wet state cannot be solved, and the use is unsafe. (2) The joint of the bracket and the heater has no chamfer or groove, (3) the joint has no sealant, the gap of the joint is easy to seep water, the sealing performance can not be ensured, the problems of water seepage and electric leakage in the use in the moisture environment can not be solved, and the use is unsafe. Creativity of claims 27-29: the joint gap between the seat body of the bracket and the heating device has double sealing glue and strengthened sealing, and the chamfer or the groove of the joint surface can effectively store the sealing glue with better fluidity, thoroughly avoid water seepage and improve the waterproof performance. (3) The sealant stored at the chamfer increases the bonding area, improves the bonding strength, prolongs the service life, and avoids electric leakage and short circuit caused by moisture and condensed water drops.

Further, the assembly comprises a first mounting bracket, a second mounting bracket and a power supply wiring harness connected with a temperature controller and a temperature fuse, wherein the first mounting bracket comprises a base body and a sealing cover, and chamfers or grooves are arranged on the peripheries of all joint parts of the base body and the sealing cover.

Furthermore, the chamfer or the groove inclines or sinks towards one side of the cavity of the seat body, and sealant which coats all gaps at all joints of the seat body and the sealing cover is poured into the chamfer or the groove.

Further, after the seat body of the first mounting bracket is covered with the seal cover, a temperature-resistant and insulating heat-shrinkable sleeve is sleeved on the seat body, and the heat-shrinkable sleeve shrinks at the temperature of 70-120 ℃ to fix and seal the bracket into a closed whole without any fit clearance on the surface.

Further, the PTC heating devices are combined in parallel by a plurality of sets.

An electrical appliance comprises an assembly of PTC heating devices.

Further, the electric appliance is at least one selected from the group consisting of an air conditioner, a warm air blower, a hot air curtain machine, a bath heater, a dehumidifier, an air purifier, a clothes dryer, a new energy automobile heater and a defrosting demister.

Has the advantages that: compared with the prior art:

(1) the temperature control is positioned in the cavity of the bracket seat body, the temperature change of the temperature sensing surface of the temperature controller under the ventilation working state of the heating device and the difference of the dry burning state when the temperature is abnormal are not obvious, and the temperature of the temperature sensing surface can reach the protection temperature only by long recovery time. (2) The temperature difference between the ventilation state and the dry-burning state is not obvious, and the malfunction is easily caused. (3) The temperature control cavity is arranged in the seat body of the bracket, the occupied space is large, the interference of power lines and connecting points among different polarities in the cavity of the seat body is easily caused, and major safety accidents such as short circuit or creepage and the like occur. 3. The utility model has the advantages that: (1) the temperature difference of the temperature sensing surfaces of the temperature controller and the temperature fuse is obviously different under the normal working state of heating and ventilation and the abnormal state of heating and non-ventilation. Namely: when the fan motor breaks down to cause the PTC heater to be in an abnormal working state without air dry burning, the temperature difference between the temperature controller and the temperature fuse which are positioned on the surface of the bracket and the temperature difference under the working states of ventilation and heating are more obvious, and the protection can be effectively and instantly disconnected under the state of the dry burning state without ventilation. (2) Because the temperature controller and the temperature fuse are directly radiated better by circulating natural wind in the ventilation working state, the misoperation caused by poor radiating effect of the temperature sensing surfaces of the temperature controller and the temperature fuse in the ventilation working state is reliably avoided. (3) The temperature controller and the temperature fuse are attached to the surface of the radiator of the PTC heating device, the size of a cavity where the electrode leading-out end and the power connection point are located in the first mounting bracket base body is not occupied, so that a larger mounting space is formed between the temperature control and the different-polarity power lines and the connection points of the fuse, and the sufficient creepage distance and the electrical clearance are effectively guaranteed.

(1) The joint gap between the seat body of the bracket and the heating device is provided with double sealants and enhances sealing, and (2) the chamfer or the groove of the joint surface can effectively store the sealant with better fluidity, thoroughly avoid water seepage, and improve and enhance the waterproof performance. (3) The sealant stored at the chamfer increases the bonding area, improves the bonding strength, prolongs the service life, and avoids electric leakage and short circuit caused by moisture and condensed water drops.

Drawings

Fig. 1 is a schematic structural view of a first mounting bracket of the present invention adopting a small pit body;

FIG. 2 is a schematic structural diagram of the heating device of the present invention connected to a power supply wire harness;

fig. 3 is a schematic structural view of the second mounting bracket of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

Example 1

A PTC heating device assembly comprises a PTC heater and a first mounting bracket, a second mounting bracket 16 which are composed of a PTC heating core, a heat-conducting aluminum pipe and a radiator, and a lead-in power supply wire harness connected with a temperature controller 17 and a temperature fuse 18, wherein the heating core comprises a first electrode strip and a second electrode strip which comprise a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets clamped by the heat-conducting surfaces of the electrode strips in parallel, a heat-resistant insulating silicon 4 positioned between the PTC heating sheets and the heat-conducting surfaces of the electrode strips, and a heat-resistant insulating film coating the electrode strips clamping the PTC heating element, the first mounting bracket comprises a base 19 and a sealing cover 20, the base 19 has a leading-out end for accommodating the electrode strips with different polarities of the heating device and an electric connection part of the lead-in power supply wire harness along the extending end of the electrode strips 2 of the heating device, a first cavity 26 for connecting the power supply wire harness and an inlaid sleeve, The second cavity of the radiator end part of the heating device is accommodated, the second cavity is attached to the wall thickness of the heat radiating surface of the end part of the radiator 6, a small pit body 28 for accommodating and positioning the temperature controller 17 and the temperature fuse 18 is further arranged, and the depth of the small pit body 28 is far smaller than the lengths of the temperature controller 17 and the temperature fuse 18.

The length of the open face of the pit body 28 is close to the length of the temperature controller 17 and the temperature fuse 18.

The adjacent side of the positioning wall of the small pit body 28 for positioning the thermal fuse 18 is provided with a positioning cavity groove 23 for accommodating the power supply lead wire of the fuse 18.

The partition wall of the small pit body 28 for accommodating the temperature fuse 18 and the positioning cavity groove 23 of the power supply lead wire of the adjacent temperature fuse 18 is provided with a notch 24 which is communicated with the pit body 28 and the positioning cavity groove 23, and the lead wire of the temperature fuse 18 is embedded into and positioned in the positioning cavity groove 23 of the power supply lead wire through the notch 24.

The big cavity of the uncovered of first support is intracavity has the location the not co-polar power supply that temperature controller 17 and temperature fuse 18 and input power linked to each other connect the draw-in groove, draw-in groove one side has the division wall 32 that holds and fix the power connection.

The combined part is provided with a first mounting bracket, a second mounting bracket 16 and a power supply wiring harness connected with a temperature controller 17 and a temperature fuse 18, the first mounting bracket is provided with a seat body 19 and a sealing cover 20, and chamfers or grooves are arranged at the wall openings on the periphery of the side wall of the cavity at the junction of the seat body 19 and the leading-out end of the heating device for containing and positioning.

The chamfer or the groove is sunken towards one side contacting the heating device, and sealant 14 which completely fills gaps at the joint of the peripheral wall openings of the side wall of the support and the heating device is poured into the chamfer or the groove.

The assembly comprises a first mounting bracket, a second mounting bracket and a power supply wiring harness connected with a temperature controller 17 and a temperature fuse 18, wherein the first mounting bracket comprises a base 19 and a cover 20, and chamfers or grooves are arranged on the peripheries of all joint parts of the base 19 and the cover 20.

The chamfer or the groove inclines or sinks towards one side of the cavity of the seat body, and the sealant 14 which coats all gaps at all joints of the seat body and the sealing cover is poured into the chamfer or the groove.

In the assembly of the PTC heating device, after the seat body of the first mounting bracket is covered with the sealing cover, the heat-resistant and insulating heat-shrinkable tubing 25 is sleeved, and at the temperature of 70-120 ℃, the heat-shrinkable tubing 25 shrinks, so that the bracket is fixed and sealed into a closed whole without any fit clearance on the surface.

The PTC heating devices are combined in parallel.

Example 2

An electrical appliance contains an assembly of PTC heating devices.

The electric appliance is at least one selected from an air conditioner, a warm air blower, a hot air curtain machine, a bath heater, a dehumidifier, an air purifier, a clothes dryer, a new energy automobile warm air device or a demisting and defrosting device.

Claims (13)

1. A combination of PTC heating devices, characterized in that: the PTC heater comprises a PTC heating core, a heat-conducting aluminum pipe, a PTC heater consisting of a radiator, a first mounting bracket, a second mounting bracket and a lead-in power supply wire harness connected with a temperature controller and a temperature fuse, wherein the heating core comprises a first electrode strip and a second electrode strip which comprise electric conduction surfaces and heat conduction surfaces, a plurality of PTC heating sheets clamped by the heat conduction surfaces of the electrode strips in parallel, temperature-resistant insulating silica gel positioned between the PTC heating sheets and the heat conduction surfaces of the electrode strips, and a temperature-resistant insulating film coating the electrode strips clamping the PTC heating element, the first mounting bracket comprises a base body and a sealing cover, the base body is provided with a leading-out end used for accommodating the electrode strips with different polarities of the heating device and an electric connection part of the lead-in power supply wire harness, a first cavity and an embedding sleeve which are connected with the power supply wire harness, and a second cavity for accommodating the end part of the radiator of the heating device along the extending end of, the second cavity is attached to the wall thickness of the heat dissipation surface of the end portion of the radiator, a small pit body for accommodating and positioning the temperature controller and the temperature fuse is further arranged, and the depth of the small pit body is far smaller than the lengths of the temperature controller and the temperature fuse.

2. An assembly of PTC heating devices according to claim 1, wherein: the length of the open surface of the small pit body is close to the length of the temperature controller and the length of the temperature fuse.

3. An assembly of PTC heating devices according to claim 2, wherein: and a positioning cavity groove for accommodating the fuse power supply lead is arranged on one side adjacent to the positioning wall of the small pit body for positioning the temperature fuse.

4. An assembly of PTC heating devices according to any one of claims 1 to 3, wherein: the partition wall of the positioning cavity groove of the small pit body for accommodating the temperature fuse and the power lead of the adjacent temperature fuse is provided with a notch which is communicated with the pit body and the positioning cavity groove, and the lead of the temperature fuse is embedded into the positioning cavity groove of the power lead and is positioned in the positioning cavity groove through the notch.

5. An assembly of PTC heating devices according to claim 4, wherein: the big cavity of uncovered of first support is intracavity has the location the not co-polar power supply that temperature controller and temperature fuse link to each other with input power connects the positioning groove, positioning groove one side has the division wall that holds and fix the power connection.

6. An assembly of PTC heating devices according to claim 1, 2, 3 or 5, wherein: the combined part is provided with a first mounting bracket, a second mounting bracket and a power supply wire harness connected with a temperature controller and a temperature fuse, wherein the first mounting bracket is provided with a base body and a sealing cover, and chamfers or grooves are arranged at wall openings on the periphery of the side wall of the cavity at the junction of the leading-out end of the heating device and the base body.

7. An assembly of PTC heating devices according to claim 6, wherein: the chamfer or the groove is sunken towards one side contacting the heating device, and sealant for completely filling gaps at the joint of the peripheral wall openings of the side wall of the support and the heating device is poured into the chamfer or the groove.

8. An assembly of PTC heating devices according to claim 1, 2, 3, 5 or 7, wherein: the combined part comprises a first mounting bracket, a second mounting bracket and a power supply wiring harness connected with a temperature controller and a temperature fuse, wherein the first mounting bracket comprises a base body and a sealing cover, and chamfers or grooves are arranged on the peripheries of all joint parts of the base body and the sealing cover.

9. An assembly of PTC heating devices according to claim 8, wherein: the chamfer or the groove inclines or sinks towards one side of the cavity of the seat body, and sealant which coats all gaps at all joints of the seat body and the sealing cover is poured into the chamfer or the groove.

10. An assembly of PTC heating devices according to claim 1, 2, 3, 5, 7 or 9, wherein: after the seat body of the first mounting support is covered with the seal cover, the seat body is sleeved with a temperature-resistant and insulating heat-shrinkable sleeve, and the heat-shrinkable sleeve shrinks at the temperature of 70-120 ℃ to fix and seal the support into a closed whole without any fit clearance on the surface.

11. An assembly of PTC heating devices according to claim 1, 2, 3, 5, 7 or 9, wherein: the PTC heating devices are combined in parallel.

12. An electrical appliance, characterized by: an assembly comprising a PTC heating device according to any of claims 1, 2, 3, 5, 7 or 9.

13. The electrical appliance according to claim 12, wherein the electrical appliance is at least one selected from the group consisting of an air conditioner, a fan heater, a hot air curtain, a bath heater, a dehumidifier, an air cleaner, a clothes dryer, a new energy automobile heater, and a defogger.

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