PTC heating device and assembly thereof

Abstract

The invention discloses a PTC (Positive Temperature Coefficient) heating device, the heating device comprises a heating core, a heat-conducting aluminum tube and a radiator, a PTC heating sheet and an electrode strip of the heating core, the heat-conducting aluminum tube and the radiator are bonded and solidified by adopting synthetic silica gel, and one side of the heat-conducting aluminum tube of the heating device is provided with an arc cylinder reinforcing rib. Comprising a heating device and a mounting bracket. A power supply leading-out end and a power supply connecting part of the heating device as well as a temperature controller and a temperature fuse which are connected to the power wire harness are all positioned in corresponding cavities of the mounting bracket seat body; and the cavities are parallel to the length direction of a heat conduction or heat dissipation surface of the heating device or have an angle of not more than 180 degrees with the length direction of the heat conduction or heat dissipation surface of the heating device. According to the invention, the strength of the heating device is improved, the potential safety hazard of interference between the fuse lead and the body is eliminated, and a series of structure, process and reliability effects of compact structure, reliable work, safe use and the like are satisfied.

Description

Technical Field

[0001] The present invention relates to a thermosensitive ceramic heater and an assembly thereof, in particular to a PTC heating device with a heat-conducting aluminum tube having a main body reinforcing rib on the side and an assembly thereof. Background Art

[0002] A bracket for a PTC thermosensitive ceramic electric heater and a PTC electric heater (Publication No. CN201174784) include a mounting surface and a supporting surface. An inner concave cavity for mounting and fixing a heating element is provided on the supporting surface. A cavity for placing a connecting wire of a power supply lead-out end of the heating element extending inward is further provided at the bottom of the inner concave cavity. A wire lead-out hole is provided on the supporting surface at the bottom of the cavity. A through hole for placing a fuse is provided on a side wall of the supporting surface.

[0003] Through this technical solution, the fuse can be combined with the bracket to prevent it from being connected to the periphery of the bracket and affecting safety. However, since it is still mounted on a side wall of the supporting surface, its connecting wire will still wind around the outside of the bracket, and there is still a hidden danger that the power supply lead will loosen or fall off under the action of external force.

[0004] A PTC heater support base and a PTC heater (Publication No.: CN200920235929) include a seat body, a cover plate and a screw; the seat body and the cover plate are fixedly connected by the screw; a cavity with one open side is provided in the seat body, and a spaced upper wall and a spaced lower wall are provided in the cavity; the spaced upper wall is located between the heating element and the temperature controller of the PTC heater; the spaced lower wall is located between the heating element and the temperature fuse of the PTC heater.

[0005] Through this technical solution, the temperature controller and the temperature fuse can be installed in the bracket to solve the reliability problem of the positioning of the temperature controller and the fuse. However, since the lead wire is prone to loosen and fall off under the repeated pulling of external force, there is also a risk of short circuit and contact sparking or loosening due to poor crimping at the connection surface of the two different-polarity electrode plates and the wire group.

[0006] A PTC heater (Publication No.: 104053255A) shares one tail seat and one electrical connection seat for two or more heaters. After the temperature controller and the temperature fuse are fixed in the bare electrical connection seat, the electrical plug cavity and the electrical shielding connection seat cover are inserted. Adopting this technology can solve the positioning problem of the installation of the temperature controller and the fuse in the tail seat of the electrical connection seat, but still cannot solve the safety and reliability problems such as displacement and mutual interference between the parts inside the bracket seat body and between the power supply leads.

[0007] The above-mentioned existing technologies all have the problem that there is no effective insulation and fixation for the power connection wire of the thermosensitive ceramic heater after it is led out, which is easily affected by pulling, and at the same time, the power connection wire inside the installation bracket is also easily affected by external pulling.

[0008] In addition, whether the thermosensitive ceramic heaters for existing cabinet air conditioners are single-group or multi-group in parallel, after the power connection wires are led out, they interfere with each other and there is no effective insulation and fixation. Affected by the assembly and transportation pulling of the whole machine, safety accidents such as falling off and short circuit are extremely likely to occur.

[0009] A PTC liquid electric heater (Publication No. CN2612898Y), the power supply wire is connected to and supplies power to the electrode, and the power supply wire is connected to the outside through the power supply wire inlet of the metal shell.

[0010] Adopting this technical solution, since the power supply wire is directly connected to the electrode, the contact resistance is large, and the connection point of the power supply wire is prone to falling off under the action of external force.

[0011] A fast electric water heater heated by PTC (Publication No. CN2742335Y), the wire on the electrical control device is connected to the insert piece on the heating device.

[0012] Adopting this technical solution, at least with the help of insert pieces, plug springs and sheaths, the connection of the wire and the PTC electrode piece can be completed to ensure its safety. At the same time, the requirements for inserting the insert piece are very high. If the connection with its fitting part is not completed, the insert piece is prone to falling off from the PTC electrode piece, resulting in damage to the heater.

[0013] A PTC heating element with fastening terminals (Publication No. CN2684506Y), a buckle piece is provided on the terminal, and the buckle piece is connected to the electrode plate by stamping. Adopting this technical solution, the buckle piece is equivalent to an insert piece, and the stamping distance needs to be adjusted in real time. There will inevitably be a contact gap at the docking part of the insert piece and the plug spring. If the connection with its fitting part is not completed, the insert piece is prone to falling off from the PTC electrode piece or the docking plug spring, resulting in non-conduction of the heater. And real-time adjustment requires extra manual care, resulting in increased costs.

[0014] In addition, the prior art also has a connection scheme of stamping the connecting piece with a flanging crimping surface or a corner wrapping crimping surface and the electrode piece of the heating strip. Although this scheme can solve the problem of reliable crimping of the wire group and the connecting piece, since the flanging crimping surface or the corner wrapping crimping surface and the electrode piece are in surface contact, if they do not fit smoothly, it is easy to cause loosening of the fit and resulting in loosening. Coupled with the fact that the flat punch of the stamping die applies impact pressure to both sides of the flanging or corner wrapping at the same time, since the contact between the electrode piece and both sides of the flanging or corner wrapping is line contact and the indentation is concentrated here, if the stamping die has a slight unevenness, it will cause damage and fracture of the electrode piece on the indentation line, resulting in the scrapping of the entire heating strip and wire group.

[0015] In summary: The connection methods of the power supply wire and the electrode piece in the above prior art all have many potential safety and reliability hazards such as poor contact, loose crimping, and stamping damage.

[0016] Prior art: The conductive adhesive is used between the heating sheet and the electrode sheet. Since the conductive adhesive contains a large amount of metal conductive powder, the bonding strength of the adhesive is greatly reduced. 2. The silica gel that rapidly solidifies naturally at room temperature is used, resulting in high production and storage costs and inconvenient use. 3. The existing heating core forms side grooves after rolling, which has a positive effect on improving the contact between the heating element, the electrode sheet and the heating surface of the aluminum tube and enhancing the thermal efficiency.

[0017] Disadvantages of the prior art: 1. Xinya CN00221004: (1) Although it is set that there are various insertion methods such as the side wall, the front wall or the top wall of the bracket and forward, backward, left or right, etc., it is limited that the temperature control sensing surface must be closely attached to the heat dissipation strip with live surface, which is prone to safety accidents such as short circuit and electric leakage, and 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 cavity of the bracket, so that the power leads and the electrical connection points can only be exposed outside the bracket. (3) The set cover plate only has a positioning function against the thermostat and cannot solve the problem of the exposed connection points of the live part, bringing great potential safety and reliability hazards in use. 2. Xu Chengdong CN201420064071: The cover plate set in the space on the surface of the bracket is easy to cause water droplets to penetrate into the cavity for positioning the thermostat and the fuse, bringing potential safety hazards. 3. Guowei 200920235929: (1) The thermostat is located in the cavity of the bracket body. When the heating device is in a ventilated working state, the temperature change of the sensing surface of the thermostat and the dry burning state during abnormal conditions are not obvious, and it takes a long recovery time for the temperature of the sensing surface to reach the protection temperature. (2) The temperature difference between the ventilated state and the dry burning state is not obvious, which is easy to cause misoperation. (3) The thermostat cavity is placed in the bracket body, occupying a large space, which is easy to cause interference between the power lines and connection points of different polarities in the cavity of the body, resulting in major safety accidents such as short circuit or creepage.

[0018] 1. Guowei patents CN204741574U and CN104797015A: (1) There is no extension surface and the second through hole on the cover plate. (2) There is no sealing ring on the wire harness, and the wire harness is positioned by wire ties, which is easy to loosen and unreliable.

[0019] Prior art: (1) There is no sealant inside the cavity of the tail bracket. When the heater works, the condensed water generated due to the rapid change of the ambient temperature is easy to penetrate into the internal part of the tail aluminum tube heating body, resulting in a short circuit. (2) For Linzhi CN302536477S, there are unsealed steps at the tail, which cannot accommodate the sealant. (3) The tail of the aluminum tube heating body is flush with or lower than the tail of the radiator.

[0020] Prior art: Gree CN201010245871: (1) All power connection points are exposed on the surface of the bracket, unable to solve the problems of leakage under sealing and humid conditions, and is unsafe to use. (2) There is no chamfer or groove at the joint between the bracket and the heater. (3) There is no sealant at the joint, and the gap at the joint is prone to water seepage, unable to ensure the sealing performance and avoid water seepage and leakage problems under humid environments, and is unsafe to use. Summary of the Invention

[0021] Object of the Invention: The object of the present invention is to solve the problems of a series of major and malignant safety accidents such as the loosening of the heat-conducting aluminum tube caused by the release of thermal stress due to the instantaneous cold and heat shock during the start-up - heating - shutdown cooling process of the in-tube heating element of the existing PTC heating device during frequent operation, resulting in gaps between the in-tube heating element, the conductive electrode, and the insulating layer, and the resulting surface electrification, leakage, short circuit, breakdown, explosion, and burning of flammable plastics in the indoor unit due to the sparking, carbonization between the heating element and the electrode plate, and local high temperature caused by long-term sparking, which leads to the melting of the insulating layer.

[0022] Technical Solution: A PTC heating device includes a PTC heating core, a thin-walled flat and long hollow heat-conducting aluminum tube, and a radiator. The heating core is composed of a first electrode strip and a second electrode strip including a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets juxtaposed and clamped by the heat-conducting surfaces of the electrode strips, a temperature-resistant insulating silica gel located between the PTC heating sheets and the heat-conducting surfaces of the electrode strips, and a temperature-resistant insulating film covering the electrode strips clamping the PTC heating element. The temperature-resistant insulating silica gel has at least two components, and at least one of the components is liquid at room temperature. The two silica gels are configured in a ratio of approximately 1:1 and fully mixed to form a synthetic silica gel with good fluidity. The preparation process of the heat-conducting aluminum tube includes the following steps:

[0023] 1) Melting and softening aluminum ingots in a special melting furnace;

[0024] 2) Then stretching the softened aluminum liquid with a certain strength at the furnace mouth through a special die cavity to the outside of the furnace, and the die cavity is located at the furnace mouth of the melting furnace;

[0025] 3) The softened aluminum liquid is rapidly cooled during the uniform stretching process in a room-temperature environment to form a flat and long hollow heat-conducting aluminum tube.

[0026] Further, the radiator is a corrugated heat dissipation strip. The heating core is inserted into the flat long cavity of the heat-conducting aluminum tube to form an aluminum tube heating body. After gradually rolling the heat-conducting plane of the heating body, all the gaps between the PTC heating sheet, the electrode strip and the temperature-resistant insulating film in the heating core inserted into the cavity of the heat-conducting aluminum tube and between the heat-conducting plane of the heating core and the inner wall of the heat-conducting aluminum tube are eliminated, and they are closely attached to each other to form a PTC heating body. The heat-conducting plane of the PTC heating body is attached to the corresponding heat-conducting plane of the heat dissipation strip, and synthetic silica gel is applied at the attachment. At a temperature of 150 - 300 °C and for a time of more than 5 minutes, the synthetic silica gel is completely cured, and the heat-conducting aluminum tube heating body and the heat dissipation strip are firmly bonded into one body.

[0027] Further, the heat-conducting aluminum tube heating body is rolled over the entire heat-conducting surface of the heating body by using multiple groups of rollers. The distance between the rolling surfaces of each group of rollers can be finely adjusted. After being rolled by each group of rollers in sequence, the thickness of the heating body is gradually reduced by 0.01 - 0.25 mm compared with that before rolling.

[0028] Prior art: For claims 1-2, there is a conductive adhesive between the heating sheet and the electrode sheet. Since the conductive adhesive contains a large amount of metallic conductive powder, the bonding strength of the adhesive is greatly reduced. 2. The silicone used solidifies rapidly and naturally at room temperature, resulting in high production and storage costs and inconvenient use. 3. The existing heating core has grooves on the side formed after rolling, which has a positive effect on improving the contact between the heating element, the electrode sheet, and the heating surface of the aluminum tube, and enhancing the thermal efficiency. The present invention can greatly improve and enhance the bending caused by the stress released due to the change in the thickness state of the heating core after rolling, ensuring the flatness and non-deformation of the product after rolling. For products with a length of more than 500 - 1000 mm (wall-mounted and floor-standing air conditioners between 1.5 hp and 5 hp), the reinforcing ribs on the side can greatly improve the bending and folding resistance strength, effectively eliminating and reducing the deformation caused by external forces during turnover, transportation, and installation. In addition, the reinforcing ribs on the side can also greatly improve and enhance the wrapping strength of the heat-conducting aluminum tube around the internal heating element, conductive electrode sheet, and insulation layer, effectively eliminating the heat stress release caused by the instantaneous temperature change during the frequent start-heating-shutdown cooling process of the internal heating body of the tube, which leads to the loosening of the heat-conducting aluminum tube and the resulting gaps between the internal heating element, conductive electrode, and insulation layer, as well as the common surface charging, leakage, short circuit, breakdown, explosion, and burning of flammable plastics in the indoor unit caused by the sparking, carbonization between the heating element and the electrode sheet, and local high temperature caused by long-term sparking, resulting in a series of major and serious safety accidents. (1) Since the indentation size of the aluminum tube into the inner cavity during the rolling process after tube threading is smaller compared to that without the reinforcing ribs, this can reduce the safety hazard of non-insulation caused by the extrusion of the side wall of the tube on the insulation film during the pressing process; (2) The reinforcing ribs on the side are more beneficial for eliminating the irregular extension of the aluminum tube in the length and width directions during the rolling of the aluminum tube heating body after tube threading to eliminate the gaps between the internal parts of the tube and between the tube walls (including the extension of the wall thickness of the aluminum tube itself). On the premise of uniform extension, the electrode sheet, insulation film, and PTC heating element inside the aluminum tube will be tightly combined with the inner wall of the aluminum tube in all directions, which will have a positive effect on improving the thermal efficiency, anti-aging performance, and long-term use reliability of the product; (3) On the premise of uniform shrinkage of the aluminum tube and closer combination between the internal parts of the tube, it also has an obvious improvement effect on reducing the operating noise caused by temperature change of the product.

[0029] Without reinforcing ribs and with only less than 3 sets of rollers, it can only adjust the pressure and cannot adjust the distance between the two rollers. 2. Invention effect: (1) For claims 1 and 2-1, since the surface contact between the PTC heating sheet and the electrode strip is not an absolute mirror surface, it conducts electricity based on the corresponding minute protruding points in contact, and the concave points store silica gel to maintain the bonding strength. By rolling the heat-conducting surface of the heat-conducting aluminum tube, the conductive contact points are evenly distributed, and the silica gel stored in the concave points is tight and uniform, that is, it ensures reliable and uniform electrical contact points, makes the current distribution uniform, eliminates the contact resistance, and at the same time makes the silica gel stored in the concave points between the corresponding heat-conducting contact surfaces also evenly distributed, ensuring the connection and contact strength. (2) For claims 3 and 4, the reinforcing ribs can accurately set the thickness of the heating core after pressing. On the basis of the gradually decreasing thickness, the contact and fit between the heating element in the heat-conducting aluminum tube and the heat-conducting aluminum tube are closer. 2. By gradually and slightly reducing the thickness of the heating core, it is ensured that the heating elements in the tube do not crack or break after pressing, there is no gap between the sheets, and the combination between the heating element and the electrode sheet is firm. Example: The designed gap of the first group of rollers is 0.05 mm, which has the effect of evenly and tightly fitting the high-viscosity silica gel between the heating element and the electrode sheet, ensuring that due to the uniform pressing of the silica gel, there is no displacement and gap between adjacent heating elements and between them and the electrode sheet due to the bonding effect of the glue when the pressure increases. The subsequent groups of rollers are gradually pressurized on this basis to make the contact surfaces between the various fittings in the tube fit more tightly. Especially for the brittleness of the ceramic heating element, it is significantly improved under the state of slowly, evenly and gradually increasing the pressure in the linear and entire surface directions of the heat-conducting width. It eliminates the major safety accidents such as short circuits and open circuits of the heating device caused by the cracks and breakages of the heating elements that are unavoidable in the existing technology during pressing, and the durability hidden dangers such as power attenuation and reduced service life caused by the de-bonding or uneven fitting between the heating element and the electrode sheet.

[0030] A PTC heating device, comprising a PTC heating core, a heat-conducting aluminum tube and a radiator, wherein the heat-conducting aluminum tube has a heat-conducting plane and a pressing surface, the wall thickness of the heat-conducting plane is more than 3 times that of the pressing surface, the radiator includes heat-dissipating fins, and the preparation process of the heat-conducting aluminum tube is as follows:

[0031] 1) Melting and softening aluminum ingots in a special melting furnace;

[0032] 2) Then stretching the softened aluminum liquid with a certain strength at the furnace mouth through a special die cavity to the outside of the furnace, and the die cavity is located at the furnace mouth of the melting furnace;

[0033] 3) The softened aluminum liquid is rapidly cooled during the uniform stretching process at room temperature to form a flat and long hollow heat-conducting aluminum tube.

[0034] Further, the radiator is formed by shoveling the heat-conducting plane wall thickness of the heat-conducting aluminum tube into heat-dissipating fins. The heating core is composed of a first electrode strip and a second electrode strip including a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets juxtaposed and clamped by the heat-conducting surfaces of the electrode strips, heat-resistant insulating silica gel, and a heat-resistant insulating film.

[0035] Further, the heat-conducting plane wall thickness at the shoveled heat-dissipating fin part of the heat-conducting aluminum tube is 3 - 15 mm, the width of the heat-dissipating fin is 11.5 - 24.5 mm, the height is 5 - 17 mm. The two sides of the heat-dissipating fins on the heat-conducting plane of the heat-conducting aluminum tube are positioning pressing surfaces with a width smaller than the width of the heat-dissipating fin. The wall thickness of the positioning pressing surface is 0.1 - 1.5 mm, the width is 0.5 - 6 mm, the wall thickness of the two side walls of the heat-conducting aluminum tube is 0.2 - 2.5 mm, and the thickness of the heat-dissipating fin is 0.02 - 2.5 mm.

[0036] Pressing can be carried out by applying pressure to the two side pressing surfaces and rolling the two side pressing surfaces with multiple groups of rollers.

[0037] Further, the heating core is composed of a first electrode strip and a second electrode strip including a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets juxtaposed and clamped by the heat-conducting surfaces of the electrode strips, heat-resistant insulating silica gel located between the PTC heating sheet and the heat-conducting surface of the electrode strip, and a heat-resistant insulating film covering the electrode strip clamping the PTC heating element. After the heating core penetrates into the cavity of the heat-conducting aluminum tube including the heat-dissipating fins, by applying pressure to the pressing surface of the heat-conducting aluminum tube, the width gap between the heating core and the inner side wall of the cavity of the heat-conducting aluminum tube is basically eliminated and then combined into the PTC heating device. The heat-dissipating aluminum tube at the end of the power input end of the heating device extends 5 - 50 mm beyond the end of the heat-dissipating fin corresponding to this end.

[0038] Further, there is at least 1 folding surface in the width direction of the heat-dissipating fins on the heat-conducting aluminum tube, and the apex angle of the fold is 5 - 40 degrees.

[0039] Further, the heat-dissipating fin has a substantially arcuate surface along the width direction of the heat-dissipating surface. The chord width of the arc surface is 2 - 8 mm, and the height of the arc is 0.1 - 1.5 mm.

[0040] Advantages of the invention: 1. Increase the heat-dissipating area; 2. Reduce the aluminum material cost; 3. The shape of the heat-dissipating fin can achieve the effect of storing and accommodating the condensed water droplets caused by the surface temperature difference of the heater after shutdown, and prevent the functional defects caused by the blowing of this part of the water droplets into the room with the instant heat exchange air volume during the next startup.

[0041] A PTC heating device includes a heating core, a thin-walled flat and long hollow heat-conducting aluminum tube, and a radiator, and the preparation process of the heat-conducting aluminum tube includes the following steps:

[0042] 1) Melting and softening aluminum ingots in a dedicated melting furnace;

[0043] 2) Then stretching the softened aluminum liquid with a certain strength at the furnace mouth out of the furnace through a special die cavity, and the die cavity is located at the furnace mouth of the melting furnace;

[0044] 3) The softened aluminum liquid is rapidly cooled during the uniform stretching process in a room-temperature environment to form a flat and long hollow heat-conducting aluminum tube.

[0045] Furthermore, the heating core is composed of a first electrode strip and a second electrode strip including a conductive surface and a heat-conducting surface, several PTC heating sheets juxtaposed and clamped by the heat-conducting surfaces of the electrode strips, heat-resistant insulating silica gel located between the PTC heating sheets and the heat-conducting surfaces of the electrode strips, and a heat-resistant insulating film covering the electrode strips clamping the PTC heating elements. The surface of the heat-conducting aluminum tube is a heat-conducting plane and a pressing surface with substantially equal wall thicknesses. The radiator is inlaid or welded on the heat-conducting plane of the heat-conducting aluminum tube. After the heating core penetrates into the cavity of the heat-conducting aluminum tube including the radiator, by pressing the pressing surface of the heat-conducting aluminum tube, the width gap between the heating core and the inner side wall of the cavity of the heat-conducting aluminum tube is basically eliminated simultaneously. The width of the pressing surface is 0.5 - 6 mm, and the radiator is positioned on the heat-conducting plane of the heat-conducting aluminum tube to form the PTC heating device.

[0046] A PTC heating device includes a PTC heating core, a heat-conducting aluminum tube, and a radiator. The heating core is composed of a first electrode strip and a second electrode strip including a conductive surface and a heat-conducting surface, several PTC heating sheets juxtaposed and clamped by the heat-conducting surfaces of the electrode strips, heat-resistant insulating silica gel located between the PTC heating sheets and the heat-conducting surfaces of the electrode strips, and a heat-resistant insulating film covering the electrode strips clamping the PTC heating elements. A part of the heating core at the electrode lead-out end of the heating device extends beyond the end corresponding to the heat-conducting aluminum tube, and heat-resistant insulating sealant is coated on the periphery of the joint between the insulating film of the electrode lead-out end part of the heating core and the heat-conducting aluminum tube.

[0047] Function: It can effectively prevent condensation water droplets from seeping into the gap between the inside of the heat-conducting aluminum tube and the heating core through the gap at the joint between the heat-conducting aluminum tube and the heating core when the heating device is used in a humid environment, resulting in water droplets invading the gap between the electrode strip covered by the insulating film and the PTC heating sheet, causing leakage and non-insulation of the heating device, and even short circuits, breakdowns, and other failures as well as major safety accidents such as explosions, fires, and electric leakage of electrical products such as air conditioners using the PTC heating device.

[0048] A PTC heating device includes a PTC heating core, a heat-conducting aluminum tube and a radiator. The heating core consists of a first electrode strip and a second electrode strip including a conductive surface and a heat-conducting surface, several PTC heating sheets juxtaposed and clamped by the heat-conducting surfaces of the electrode strips, a heat-resistant insulating silica gel located between the PTC heating sheets and the heat-conducting surfaces of the electrode strips, and a heat-resistant insulating film covering the electrode strips clamping the PTC heating elements. There are at least one columnar reinforcing rib on the side surface of the heat-conducting aluminum tube of the heating device. The columnar reinforcing rib is at a generally central position on the side surface of the heat-conducting aluminum tube heating body and is as long as the heat-conducting aluminum tube. The cross-section of the columnar reinforcing rib is a generally arc shape with a chord width of 0.3 - 2 mm and an arch height of 0.2 - 2 mm.

[0049] A PTC heating device, characterized in that: a heat dissipation strip and a PTC heating sheet attached to the heat-conducting sheet of the heat dissipation strip form a group. There is a mixed silica gel between the heat-conducting plane of the heat dissipation strip heat-conducting sheet and the heating plane of the heating sheet. The mixed silica gel is composed of at least two components, and at least one of the components is liquid at room temperature. After being proportionally configured and fully mixed, the silica gel becomes a synthetic silica gel with good fluidity. At a temperature of 150 - 300 °C and for a time of more than 5 minutes, the synthetic silica gel is completely cured, combining the heat dissipation strip and the PTC heating sheet into the PTC heating device.

[0050] An assembly of a PTC heating device includes a PTC heater composed of a PTC heating core, a heat-conducting aluminum tube and a radiator, a first mounting bracket, a second mounting bracket, and an incoming power supply wire harness connecting a temperature controller and a temperature fuse. The heating core consists of a first electrode strip and a second electrode strip including a conductive surface and a heat-conducting surface, several PTC heating sheets juxtaposed and clamped by the heat-conducting surfaces of the electrode strips, a heat-resistant insulating silica gel located between the PTC heating sheets and the heat-conducting surfaces of the electrode strips, and a heat-resistant insulating film covering the electrode strips clamping the PTC heating elements. The first mounting bracket has a seat body and a cover. The seat body has an open large cavity for accommodating the lead-out ends of different-polarity electrode strips of the heating device along the extending ends of the electrode strips of the heating device, an electrically connected part with the incoming power supply wire harness, and a wire connection of the power supply wire harness. There is also an open small cavity separated by a positioning insulating wall in the open large cavity. The small cavities respectively accommodate and position the heat-conducting surface at the end of the heating device, the temperature controller, or the temperature fuse. The temperature-sensing surfaces of the temperature controller and the temperature fuse are attached to one side of the positioning insulating wall corresponding to the heat-conducting plane of the adjacent heating device. The angle between the cavities positioning the temperature controller and the temperature fuse and the heat-conducting surface at the end of the heating device is 0 - 90°.

[0051] Furthermore, there is an open positioning cavity groove for accommodating the lead-out power supply wire of the temperature fuse on the adjacent side of the positioning insulating wall of the open small cavity positioning the temperature fuse.

[0052] Furthermore, there is a notch connecting the two cavities on the positioning insulating wall of the open small cavity for accommodating the temperature fuse and the open positioning cavity groove for accommodating the power lead of the temperature fuse. The lead of the temperature fuse is embedded and positioned in the lead positioning cavity groove through this notch. The temperature controller, temperature fuse, introduced power harness and each connection point positioned in the open large cavity of the bracket seat body are all sealed in the corresponding open large cavity by the cover.

[0053] Description of the inventive points: 1. Temperature control and fusing cavity: (1) Applicable to the assemblies with charged surfaces and the assemblies with insulated surfaces. (2) For the heating devices with charged surfaces, since the surface of the radiator is charged and the surface of the round tubular fuse is also charged, the prior art all adopts radiative temperature sensing. That is, the temperature control and fusing are installed in the space with a certain electrical clearance and safety distance from the heating device, and it is necessary to install accessories such as sheet metal, resulting in high cost and low assembly efficiency. In addition, due to the adoption of thermal radiation temperature sensing, there are also functional defects such as long action time, poor sensitivity and reliability. The temperature control and fusing of the present invention are attached to the heating surface of the heating device, with high temperature sensing accuracy and fast abnormal temperature action, effectively improving the reliability. (3) By adopting the present invention, the existing temperature sensing method of temperature control and fusing protection can be changed to the conductive temperature sensing with the temperature sensing surface closely attached to the heating surface of the heating device. Whether the heating device is charged or not, the temperature sensing control element does not contact the radiator, which not only improves the safety and reliability of the product, but also greatly reduces the cost of the product and improves the assembly production efficiency. 4. Positioning cavity groove for the fusing lead: (1) Deficiencies of the prior art: Since the input and output power leads of the general cylindrical fuse are at its two ends respectively, and one of the leads has the same polarity as the surface metal shell of the fuse, it is easy to cause the two leads to short-circuit while the two short-circuited fuses do not work. (2) In the prior art, the fuse and its power input and output ends are all positioned in the same cavity, and its two different power leads are all positioned in the same cavity. Moreover, due to the limitation of the internal space of the cavity, one lead of the fuse can only be bent by more than 180° at its root and then closely attached to its outer shell to be led out. With a little external force, it is extremely easy to cause the fracture or detachment of the root, and at the same time, it also causes the displacement of the fuse, affecting the temperature control accuracy and protection function of the fuse. Inventive points: (1) A separate fuse lead positioning groove is provided. The power lead positioned in this groove can be bent twice at positions away from the root in the oral cavity of the positioned fuse, each bend being less than 90°, so that the power lead is led out from this cavity groove. No matter how large the external force is, the stress point can only be on the end wall of the notch through which the fuse lead passes, without any potential risk of displacement of the fuse. (2) Greatly improves the working reliability of the fuse. (3) The two power leads with different polarities are respectively located in two different cavities, completely avoiding the potential risk of short-circuit between the leads, and the use safety is also reliably improved, guaranteed and enhanced.

[0054] An assembly of a PTC heating device, comprising a PTC heater composed of a PTC heating core, a heat-conducting aluminum tube and a radiator, a first mounting bracket, a second mounting bracket, and an incoming power supply wire harness connecting a temperature controller and a temperature fuse. The heating core includes a first electrode strip and a second electrode strip having a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets juxtaposed and clamped by the heat-conducting surfaces of the electrode strips, a heat-resistant insulating silica gel located between the PTC heating sheets and the heat-conducting surfaces of the electrode strips, and a heat-resistant insulating film covering the electrode strips clamping the PTC heating element. The first mounting bracket has a base body and a cover. The base body has a first cavity and an insert sleeve for accommodating the electrical connection portion of the lead-out ends of different-polarity electrode strips of the heating device and the incoming power supply wire harness and the wire connection of the power supply wire harness along the extending ends of the electrode strips of the heating device, and a second cavity for accommodating the end portion of the radiator of the heating device. There is also a small pit for accommodating and positioning the temperature controller and the temperature fuse at the wall thickness portion of the second cavity that fits the heat-dissipating surface of the radiator end portion. The depth of the small pit is much smaller than the lengths of the temperature controller and the temperature fuse.

[0055] Further, the length of the open surface of the small pit is close to the lengths of the temperature controller and the temperature fuse.

[0056] Further, there is a positioning cavity groove for accommodating the power supply lead of the fuse adjacent to the positioning wall of the small pit for positioning the temperature fuse.

[0057] Further, there is a notch connecting the pit and the positioning cavity groove on the partition wall between the small pit for accommodating the temperature fuse and the positioning cavity groove for the adjacent power supply lead of the temperature fuse. The lead of the temperature fuse is embedded and positioned in the positioning cavity groove of the power supply lead through this notch.

[0058] Prior art: Guo Wei CN201515508U. Disadvantages: 1. The connection points of the temperature controller, temperature fuse and power cord harness are in the same plane of the cavity. The installation position and space are small, and it is inevitable that the power connection points and wires of different polarities interfere with each other, and there are relatively large potential safety and reliability hazards. (2) The temperature difference between the ventilation state and the dry-burning state is not obvious, which is likely to cause misoperation. Invention point: The temperature controller and fuse are positioned in the corresponding cavities of another plane at the power lead-out end and electrical connection pressure point of the heating device. The power lead-out end of the heater, the introduced power supply, and the connection points of the temperature controller and fuse are all located in the plane of the large cavity. The space of the cavity is large, and the power connection points and wires of different polarities can be conveniently isolated from each other without interference. The optimization of the structure brings improvement and enhancement of safety and reliability. Embodiment: See the structure diagram of the Aux GREE model components. 2. GREE CN102271429A. Characteristics and defects of the prior art: (1) Both the temperature control and the fuse are located on the surface of the support seat body and a considerable part is exposed. When used in a humid and corrosive environment, the control devices are easily contaminated and eroded, resulting in failure. (2) The power connection points and power leads of the live parts are all positioned on the outer surface of the support seat body. In a humid and corrosive environment, they are easily aged and the insulation is reduced, leading to safety accidents. Invention effects: (1) The temperature difference on the temperature-sensing surface of the temperature controller and temperature fuse is significantly different in the normal working states of heating and ventilation and the abnormal state of heating without ventilation. That is, when the fan motor fails and the PTC heater is in an abnormal working state of dry-burning without air, the temperature difference between the temperature controller and temperature fuse located on the support surface and the working states of ventilation and heating is more obvious. In the state of dry-burning without ventilation, it can effectively disconnect and protect instantly. (2) Because the temperature controller and temperature fuse are directly cooled by the circulating natural wind in the ventilation working state, it reliably avoids misoperation caused by poor heat dissipation of the temperature-sensing surface of the temperature controller and temperature fuse in the ventilation working state. (3) The temperature controller and temperature fuse are sealed inside the seat body of the mounting bracket and are attached to the radiator surface of the PTC heating device, without occupying the volume of the cavity where the electrode lead-out end and power connection point are located in the first mounting bracket seat body, so that there is a larger installation space between the power lines and connection points of different polarities of the temperature control and fuse and they are separated, effectively ensuring sufficient creepage distance and electrical clearance. (4) During assembly, the positioning and operation space of the power cord harness is significantly increased, greatly improving the assembly efficiency and significantly reducing the manufacturing cost.

[0059] An assembly of a PTC heating device, including a PTC heater composed of a PTC heating core, a heat-conducting aluminum tube and a radiator, a first mounting bracket, a second mounting bracket, and an incoming power supply wire harness connecting a temperature controller and a temperature fuse. The heating core includes a first electrode strip and a second electrode strip having a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets juxtaposed and clamped by the heat-conducting surfaces of the electrode strips, a heat-resistant insulating silica gel located between the PTC heating sheets and the heat-conducting surfaces of the electrode strips, and a heat-resistant insulating film covering the electrode strips clamping the PTC heating element. The first mounting bracket has a seat body and a cover. The seat body has an open large cavity along the extending end of the electrode strip of the heating device for accommodating the lead-out ends of the electrode strips of different polarities of the heating device, the electrical connection part of the incoming power supply wire harness, and the wire connection of the power supply wire harness. The open large cavity has a cavity for accommodating the temperature controller or the temperature fuse along the thickness side of the side surface of the heating device.

[0060] Further, the depth of the cavity is close to the length of the temperature controller or the temperature fuse and is in close contact with the heat-conducting surface of the heating device.

[0061] Further, the open cross-section of the cavity is perpendicular to the length direction of the heating device and is larger than the cross-section of the temperature controller or the temperature fuse.

[0062] Further, the temperature controller or the temperature fuse is inserted into the cavity from the open end of the corresponding small cavity, and the incoming power supply wire harness thereof is positioned and accommodated in the open large cavity of the seat body. After the seat body and the cover close the open large cavity, the open part of the small cavity, the live connection part of the power supply wire harness, and all the leads of different polarities are reliably sealed in the open large cavity of the bracket.

[0063] Further, the cavity is parallel to the heat-conducting surface of the heating device.

[0064] Further, there are at least two groups of the heating devices, and the cavity is located between and in contact with the heat-conducting planes of two adjacent groups of heating devices.

[0065] Disadvantages of the prior art: 1. New Industry CN00221004: (1) Although it is set that there are various insertion methods such as being able to be set on the side wall, front wall or top wall of the bracket and inserting forward, backward, left or right, etc., it is limited by the precondition that the temperature control temperature sensing surface must be closely attached to the heat dissipation strip with surface charge, which is prone to safety accidents such as short circuits and electric leakage, and is unreliable and difficult to operate and install. (2) The two jacks for temperature control and fusing respectively extend deep into the inner wall of the concave cavity of the bracket, so that the power leads and electrical connection points can only be exposed outside the bracket. (3) The set cover plate only has the positioning function of holding the thermostat and cannot solve the problem of the exposure of the connection points of the energized part, bringing great hidden dangers to the safety and reliability in use. 2. Xu Chengdong CN201420064071: The set cover plate is exposed in the space on the surface of the bracket, which is prone to water droplets seeping into the cavity for positioning the thermostat and fuse, bringing potential safety hazards. 3. Guowei 200920235929: (1) The thermostat is located in the cavity of the bracket seat. When the heating device is in the ventilation working state, the temperature change of the temperature sensing surface of the thermostat and the dry burning state during abnormal conditions are not obvious, and it takes a long recovery time for the temperature of the temperature sensing surface to reach the protection temperature. (2) The temperature difference between the ventilation state and the dry burning state is not obvious, which is prone to false operation. (3) The thermostat cavity is placed in the seat body of the bracket, occupying a large space, which is prone to interference between the power lines and connection points of different polarities in the cavity of the seat body, resulting in major safety accidents such as short circuits or creepage. Creativity: (1) The small cavity extends outwards in the opposite direction of the head direction where the power is introduced into the heating device, without occupying the volume of the cavity of the seat body, so that there is enough space between the power lines and connection points of different polarities of the thermostat and the fuse to be separated and ensure sufficient creepage distance and electrical clearance, and the material cost is also relatively low. (2) There is an insulating and heat-resistant partition wall between the temperature sensing surface of the thermostat and the heating surface of the heating device, and the temperature sensing surface is attached to the insulating partition wall adjacent to the heating surface of the heating device, without potential safety hazards such as electric leakage, creepage and false operation. (3) The small cavity, the introduced power lines and all the energized connection points are all placed in the large cavity of the seat body, without interference of different polarities, and water droplets cannot seep into the cavity for accommodating the temperature controller and temperature fuse, greatly improving and enhancing the reliability and safety in use. (4) When in the ventilation working state, the cavity for accommodating the thermostat / fuse has the same heat exchange conditions as the heating device, and the temperature is much lower than that in the dry burning and non-ventilation state. In this way, it can ensure that the protection temperature point of the thermostat is quickly reached in the abnormal state of dry burning without wind, playing a sensitive protection role, and ensuring that no false operation occurs in the working state due to the large temperature difference between the dry burning state without wind and the ventilation working state. The reliability of the product is ensured. Embodiment: The double-row component diagram of the DeLong mobile air conditioner. Embodiment description: The cavity can be closely attached to the lengthwise surface or the widthwise heat dissipation corrugated surface of the thickness side of the heating device of the device. Among them, for the structure of closely attaching to the heat dissipation corrugated surface, the temperature control and fusing can be on the same heat dissipation surface, and the windward surface is the best solution.One kind of optimized Delong double-row heating device. Since the heating device has good heat dissipation effect in the ventilation and heating state, it can completely avoid the misoperation of the thermostat or fuse in the working state, and improve the reliability of the product function.

[0066] A combination of PTC heating devices, including a PTC heater composed of a PTC heating core, a heat-conducting aluminum tube and a radiator, a first mounting bracket, a second mounting bracket, and an incoming power supply wire harness connecting a temperature controller and a temperature fuse. The heating core includes a first electrode strip and a second electrode strip with a conductive surface and a heat-conducting surface, several PTC heating sheets juxtaposed and clamped by the heat-conducting surfaces of the electrode strips, a heat-resistant insulating silicone between the PTC heating sheets and the heat-conducting surfaces of the electrode strips, and a heat-resistant insulating film covering the electrode strips clamping the PTC heating element. The first mounting bracket has a seat body and a cover. There is an open large cavity in the seat body. After the electrically connected parts of different polarities are positioned in the open large cavity, the insulating sealant fills and seals all the electrically connected parts of the lead-out electrode strips of the heating device and the power supply wire harness connected thereto and the corresponding gaps.

[0067] Further, there are limiting insulating walls along the outer sides of the extending ends of the lead-out ends of the electrode strips of different polarities of the heating device in the open large cavity. The lead-out electrode strips of the heating device filled and sealed with the insulating sealant, the electrically connected parts of the power supply wire harness connected thereto, and the corresponding insulating sealant are all positioned in the open small cavity surrounded by the limiting insulating walls.

[0068] Further, insulating heat-shrinkable sleeves are sleeved on the surfaces of the lead-out ends of the electrode strips of different polarities and the corresponding electrically connected parts positioned in the open large cavity, and the insulating sealant fills and seals all the lead-out ends of the electrode strips covered therein, the electrically connected parts connected thereto, and the corresponding gaps.

[0069] Prior art: CN104797022A, a thermosensitive ceramic heater assembly, its heater and mounting bracket. - There is no sealant at the positioning place of the lead-out ends of the electrode sheets of different polarities, there is no positioning insulating wall outside the lead-out ends, and there is no insulating heat-shrinkable sleeve on the surface of the lead-out ends. In the wet state and the immersed state, the PTC heating element will take effect immediately, short-circuit and explode the tube. Major safety accidents such as short-circuit and electric leakage will also occur in the electrical connection part.

[0070] Key points of the invention: (1) The insulating sealant completely covers and fills the gaps between the electrode leads of different polarities and the power supply pressure points, ensuring that the PTC heating element does not leak water in the humid and immersed states, and the electrical connection part can also ensure reliable insulation. (2) The positioning insulating wall outside the electrode lead plays the role of limiting the lead-out electrode and forms a cavity between the electrode leads of different polarities and their connection points to the input power supply, so that the sealant is not wasted. (3) The sealant with better fluidity can be stored in the cavity surrounded by the insulating wall, completely covering and filling the gaps between the electrode leads of different polarities and the power supply pressure points. (4) Wrapping the electrode leads of different polarities and the power supply pressure points in the heat shrinkable sleeve can further reduce the waste of the sealant, improve the reliability of the seal and the production efficiency. Invention effects: (1) Greatly improve the sealing and insulation performance, ensuring the reliable sealing and insulation of the live part. (2) Avoid the overflow and waste of the sealant, ensuring the sealing and insulation effects. (3) Improve the operability and process consistency of mass production, greatly improving the production efficiency. (Description of the embodiment: In the environment where the electrical connection part and the power cord lead-out end are all immersed in water, it can still ensure the reliable insulation of the live part of the heating device and its surface, without leakage). (4) Completely solve the problems of water seepage and leakage of the PTC heater in the humid environment, and fundamentally solve the waterproof performance and the safety and reliability of use. Embodiment: The structure diagram of the GREE small pit body assembly).

[0071] An assembly of a PTC heating device, including an assembly of a PTC heating device, and there are positioning slots in the large open cavity of the first bracket for positioning the different-polarity power supply wires connecting the temperature controller and the temperature fuse to the input power supply, and there is an isolation wall on one side of the positioning slots for accommodating and fixing the power supply wires.

[0072] Invention effects: 1. Separate and position the power supply leads of different polarities. 2. Ensure that the power supply leads connected to the temperature controller and the temperature fuse are positioned in the slots, and when subjected to external forces, it will not cause misoperation or failure of the protection function due to inaccurate temperature sensing caused by the displacement of the temperature controller and the temperature fuse.

[0073] An assembly of a PTC heating device, including a PTC heating device, a first mounting bracket, a second mounting bracket, and an introduced power cord bundle connecting the temperature controller and the temperature fuse. The first mounting bracket has a seat body and a cover. The end face of the seat body has a first through hole that is approximately semicircular. The cover has an extension perpendicular to the cover corresponding to the first through hole on the end face of the seat body, and there is a second through hole corresponding to the first through hole on the end face of the seat body on the extension.

[0074] Furthermore, the power harness is composed of the wires inserted into an insulating sleeve, and a rubber sealing ring is embedded and sheathed on the insulating sleeve. The rubber sealing ring and the power harness embedded and covered by it are positioned together in the first through hole and the second through hole. When the cover covers the base, the first through hole and the second through hole are matched to form a roughly circular third through hole. By pressing the cover, the rubber sealing ring embedded in the third through hole is tightly compacted, so that a sealed fit without any gap is formed between the rubber sealing ring and the insulating sleeve and the wire covered by it.

[0075] Furthermore, the sealing ring has at least one opening around it. Before the cover is put on and tightly sealed, the following steps can be performed:

[0076] 1) Insert the rubber sealing ring into the third through hole of the base body;

[0077] 2) Open the opening of the rubber seal ring and insert the power harness;

[0078] 3) Reset the opening of the sealing ring and completely cover the power harness;

[0079] 4) Covering the cover, the first and second through holes are matched to form a roughly circular third through hole, so that the wire is firmly compressed in the sealing ring and the gap is reliably sealed.

[0080] Furthermore, the gaps at the positioning and joining locations of the third through hole, the sealing ring and the wiring harness are filled with insulation and sealant.

[0081] Guowei patents CN204741574U and CN104797015A: (1) There is no extended surface and second through hole on the cover plate; (2) There is no sealing ring on the wiring harness, and the wiring harness is positioned by wire ties, which is easy to loosen and unreliable.

[0082] Effects of the invention: (1) The wiring harness is tightly compressed and sealed by the sealing ring, and the sealant at the joint completely eliminates the hidden dangers of moist air and water droplets penetrating into the cavity of the seat body. Even if the first bracket is immersed in water, the live connection points in the cavity of the first bracket can still be completely sealed. The structural problems of leakage and short circuit in humid and submerged environments are completely solved, greatly improving safety and reliability. (2) The third through hole forms an embedded matching structure, which increases the precision of mutual matching and the strength of the connection.

[0083] Furthermore, it includes a PTC heating device, a first mounting bracket, a second mounting bracket, and an incoming power supply harness connected to a temperature controller and a temperature fuse. The first mounting bracket has a base and a cover. The lead-out ends of the electrode sheets of different polarities and the charged surfaces of the connecting parts connected to the power supply harness are covered with insulating sleeves. The insulating sleeves and the charged surfaces of the lead-out ends of the electrode sheets and the connecting parts connected to the power supply harness are all coated with temperature-resistant and insulating sealant.

[0084] Furthermore, the connection mode of the connection part is mutual insertion between the plug spring riveted on the wiring harness and the plug sheet connected to the lead-out end of the electrode sheet.

[0085] Furthermore, the insulating sleeve is an insulating rubber sleeve that matches the plug spring.

[0086] Furthermore, the connection method of the connecting part is that the wire group is directly crimped onto the lead-out end of the electrode sheet.

[0087] Furthermore, the insulating sleeve is a temperature-resistant heat shrinkable sleeve.

[0088] A PTC heating device assembly comprises a PTC heating device, a first mounting bracket, a second mounting bracket, and a power supply wiring harness connected to a temperature controller and a temperature fuse, wherein the second mounting bracket is sleeved on the tail end of the heating device, and the tail of the non-electrode lead end of the heating device is coated with a temperature-resistant sealant to completely seal the gap at the tail end of the heating device.

[0089] Furthermore, the heat-conducting aluminum tube at the tail end of the heating device protrudes from the tail end of the heating device by 0.5 to 10 mm, and the bottom surface of the cavity of the second mounting bracket has a cavity for accommodating the protruding part of the tail end of the heat-conducting aluminum tube, and the cavity is filled with insulating sealant.

[0090] Existing technologies: (1) There is no sealant inside the cavity of the tail bracket, and the condensation water generated by the sudden change of ambient temperature when the heater is working can easily penetrate into the tail aluminum tube heating element and cause a short circuit. (2) Linzhi CN302536477S, there is an unsealed step at the tail, which cannot accommodate the sealant. (3) The tail of the aluminum tube heating element is flush with or lower than the tail of the radiator. Effect of the invention: (1) The condensation water generated by the sudden change of ambient temperature when the heater is working cannot penetrate into the tail aluminum tube heating element, causing a short circuit between the internal electrode sheets or on the side of the heating element. (2) The gap between the tail end heating element and the radiator caused by tooling and human negligence during the device molding and curing process is compensated, and the debonding and degumming between the heating element and the radiator are prevented, thereby ensuring the bonding strength of the heater, and ensuring the heat dissipation effect, safety and reliability. The safety and reliability of the heating device are improved.

[0091] Further, there are chamfers or grooves at the peripheral wall openings of the cavity side wall at the joint between the second mounting bracket and the heat-generating device of the insert sleeve.

[0092] Further, the chamfers or grooves are inclined or recessed inward towards the end of the heat-generating device in contact therewith, and a sealant is applied in the chamfers or grooves to completely fill the gaps at the joints between the peripheral wall openings of the bracket side wall and the heat-generating device.

[0093] Invention effect: It makes up for the fitting gap between the heat-generating body at the tail end and the radiator caused by tooling and human negligence during the device forming and curing process, prevents the glue opening and degumming between the heat-generating body and the radiator, ensures the bonding strength of the heater, and guarantees the heat dissipation effect, safety, and reliability. It improves the safety and reliability of the heat-generating device.

[0094] Further, the assembly includes a first mounting bracket, a second mounting bracket, and a power cord bundle connected with a temperature controller and a temperature fuse. The first mounting bracket has a base body and a cover. There are chamfers or grooves at the peripheral wall openings of the cavity side wall at the joint between the base body and the cavity for accommodating and positioning the lead-out end of the heat-generating device.

[0095] Further, the chamfers or grooves are recessed towards the side in contact with the heat-generating device, and a sealant is applied in the chamfers or grooves to completely fill the gaps at the joints between the peripheral wall openings of the bracket side wall and the heat-generating device.

[0096] Prior art: Gree CN201010245871: (1) All power contacts are exposed on the surface of the bracket, unable to solve the problems of leakage under sealing and humid conditions, and is unsafe to use. (2) There are no chamfers or grooves at the joint between the bracket and the heater. (3) There is no sealant at the joint, and the gap at the joint is prone to water seepage, unable to ensure the sealing performance and avoid water seepage and leakage problems under humid environments, and is unsafe to use. Creative points of claims 27 - 29: (1) There is a double and enhanced seal with sealant in the joint gap between the base body of the bracket and the heat-generating device. (2) The chamfers or grooves on the joint surface can effectively store sealant with better fluidity, completely prevent water seepage, and improve and enhance the waterproof performance. (3) The sealant stored at the chamfers increases the bonding area, improves the bonding strength, extends the service life, and prevents leakage and short circuit caused by humid conditions and condensed water droplets.

[0097] Further, the assembly includes first and second mounting brackets and a power cord bundle connected with a temperature controller and a temperature fuse. The first mounting bracket has a base body and a cover. There are chamfers or grooves around all joints between the base body and the cover.

[0098] Further, the chamfer or groove inclines or concaves towards the cavity side of the seat body, and a sealant that coats all the gaps at the joints between the seat body and the cover is applied in the chamfer or groove.

[0099] Further, after covering the cover on the seat body of the first mounting bracket, a heat-resistant and insulating heat shrinkable sleeve is put on. At a temperature of 70 to 120 degrees, the heat shrinkable sleeve shrinks, fixing and sealing the bracket into a closed whole without any mating gaps on the surface.

[0100] Further, the PTC heating device is composed of multiple groups in parallel combination.

[0101] An electrical appliance includes a PTC heating device and an assembly.

[0102] Further, the electrical appliance is at least one selected from an air conditioner, a heater, a hot air curtain machine, a bathroom heater, a dehumidifier, an air purifier, a dryer, a new energy vehicle heater or a defogging and defrosting device.

[0103] Beneficial effects: Compared with the prior art, the present invention:

[0104] 1. Prior art: The conductive adhesive is used between the heating sheet and the electrode sheet. Since the conductive adhesive contains a large amount of metal conductive powder, the bonding strength of the adhesive is greatly reduced. 2. The silicone rubber that rapidly solidifies naturally at room temperature is used, resulting in high production and storage costs and inconvenient use. 3. The existing heating core forms side grooves after rolling, which has a positive effect on improving the contact between the heating element, the electrode sheet and the heating surface of the aluminum tube, and enhancing the thermal efficiency. The present invention can greatly improve and enhance the bending caused by the stress released due to the change in the thickness state of the heating core after rolling, ensuring the flatness and non-deformation of the product after rolling. For those with a length of more than 500 - 1000 mm (wall-mounted and floor-standing air conditioners between 1.5 HP and 5 HP), the side reinforcing ribs can greatly improve the bending and folding resistance strength, effectively eliminating and reducing the deformation caused by external forces during turnover, transportation and installation. In addition, the side reinforcing ribs can also greatly improve and enhance the coating strength of the heat-conducting aluminum tube on the heating element, conductive electrode sheet and insulation layer enclosed therein, effectively eliminating the heat stress release caused by the instantaneous cold and heat shock during the frequent operation start - heating - shutdown cooling process of the heating body inside the tube, which leads to the loosening of the heat-conducting aluminum tube and the resulting gap between the heating element, conductive electrode and insulation layer inside the tube, and the common surface charging, leakage, short circuit and breakdown, explosion, burning of flammable plastics in the indoor unit and other series of major and malignant safety accidents caused by the sparking, carbonization between the heating element and the electrode sheet and the local high temperature caused by long-term sparking resulting in the melting of the insulation layer. (1) Since the recessed dimension of the aluminum tube into the inner cavity of the aluminum tube during the rolling process after tube threading is smaller than that without the reinforcing ribs, this can reduce the safety hazard of insulation damage caused by the extrusion of the side wall of the tube on the insulation film during the pressing process; (2) The side reinforcing ribs are more conducive to eliminating the irregular extension of the aluminum tube heating body in the length and width directions during the rolling of the aluminum tube after tube threading to eliminate the gaps between the parts inside the tube and between the tube walls (including the extension of the wall thickness of the aluminum tube itself). On the premise of uniform extension, the electrode sheet, insulation film and PTC heating element inside the aluminum tube will be closely combined with the inner wall of the aluminum tube in all directions, which will have a positive effect on improving the thermal efficiency, anti-aging performance and long-term use reliability of the product; (3) On the premise of uniform shrinkage of the aluminum tube and closer combination of the parts inside the tube, it also has an obvious improvement effect on reducing the operating noise caused by cold and heat shock of the product.

[0105] Without reinforcing ribs, there are only less than 3 sets of rollers, which can only adjust the pressure and cannot adjust the distance between the two rollers. 2. Invention effects: (1) For claims 1 and 2-1, since the surface contact between the PTC heating sheet and the electrode strip is not an absolute mirror surface, it conducts electricity based on the corresponding micro-protrusions in contact, and the recesses store silicone to maintain the bonding strength. By rolling the heat-conducting surface of the heat-conducting aluminum tube, the conductive contact points are evenly distributed, and the recesses store silicone tightly and evenly, that is, both ensuring reliable and uniform electrical contact points, making the current distribution uniform and eliminating the contact resistance, and at the same time making the silicone stored in the recesses between the corresponding heat-conducting surfaces also evenly distributed, ensuring the connection and contact strength. (2) For claims 3 and 4, the reinforcing ribs can accurately set the thickness of the heating core after pressing. On the basis of the gradually decreasing thickness, the contact and fit between the heating element in the heat-conducting aluminum tube and the heat-conducting aluminum tube are more compact. 2. By gradually and slightly reducing the thickness of the heating core, it is ensured that the heating elements in the tube do not crack or break after pressing, there is no gap between the sheets, and the combination between the heating element and the electrode sheet is firm. Example: The designed gap of the first group of rollers is 0.05 mm, which has the effect of evenly and tightly fitting the high-viscosity silicone between the heating element and the electrode sheet, ensuring that due to the uniform pressing of the silicone, the adjacent heating elements and between them and the electrode sheet are reliably positioned due to the adhesive effect of the glue and do not displace or have gaps. The subsequent groups of rollers are gradually pressurized on this basis to make the contact surfaces between the various fittings in the tube fit more tightly. Especially for the brittleness of the ceramic heating element, it is significantly improved under the state of slowly, evenly and gradually increasing the pressure in the linear and entire surface directions of the heat-conducting width. It eliminates the major safety accidents such as short circuits and open circuits of the heating device caused by the cracks and breakage of the heating element that cannot be avoided during pressing in the prior art, and the durability hidden dangers such as power attenuation and reduced service life caused by the de-bonding or uneven fitting between the heating element and the electrode sheet.

[0106] 2. Adopt a shovel-tooth heat sink. 1. Increase the heat dissipation area. 2. Reduce the aluminum material cost. 3. The shape of the heat sink can store and hold the condensed water droplets caused by the surface temperature difference of the heater after shutdown, eliminating the functional defects caused by these water droplets being blown into the room with the instant heat exchange air volume when starting the machine again.

[0107] 3. Adopt the design that the periphery of the joint between the insulating film at the electrode lead-out end part of the heating core and the heat-conducting aluminum tube is coated with a temperature-resistant insulating sealant, which can effectively prevent the condensed water droplets from seeping into the gap between the heat-conducting aluminum tube and the heating core through the gap at the joint of the heat-conducting aluminum tube and the heating core when the heating device is used in a humid environment, resulting in the water droplets invading the gap between the electrode strip and the PTC heating sheet covered by the insulating film, causing leakage and non-insulation of the heating device, and even short circuits, breakdowns and other failures as well as major safety accidents such as explosion, combustion and leakage of electrical products such as air conditioners using PTC heating devices.

[0108] 4. Temperature control and fuse cavity: (1) Applicable to assemblies with live surfaces and assemblies with insulated surfaces. (2) For heating devices with live surfaces, since the surface of the radiator is live and the surface of the round tubular fuse is also live, the prior art has adopted radiative temperature sensing. That is, the temperature control and fuse are installed in a space with a certain electrical clearance and safety distance from the heating device, and it is necessary to install accessories such as sheet metal, which results in high costs and low assembly efficiency. In addition, due to the use of thermal radiation temperature sensing, it also brings functional defects such as a long action time, poor sensitivity and reliability. The temperature control and fuse of the present invention are attached to the heating surface of the heating device, with high temperature sensing accuracy, fast abnormal temperature operation, and effectively improved reliability. (3) By adopting the present invention, the existing temperature sensing method of temperature control and fuse protection can be changed to conductive temperature sensing with the temperature sensing surface closely attached to the heating surface of the heating device. Whether the heating device is live or not, the temperature sensing control element does not contact the radiator, which not only improves the safety and reliability of the product, but also greatly reduces the cost of the product and improves the assembly production efficiency. Fuse lead positioning cavity: (1) Deficiencies of the prior art: Since the input and output power leads of a common cylindrical fuse are at its two ends respectively, and one of the leads has the same polarity as the surface metal shell of the fuse, it is easy to cause the two leads to short-circuit while the two fuses of the fuse short-circuit and do not work. (2) In the prior art, the fuse and its power input and output ends are both positioned in the same cavity, and its two different power leads are both positioned in the same cavity. Moreover, due to the limitation of the internal space of the cavity, one lead of the fuse can only be bent by more than 180° at its root and then closely attached to its outer shell and led out. With a little external force, it is extremely easy to cause the fracture or detachment of the root, and at the same time, it also causes the displacement of the fuse, affecting the temperature control accuracy and protection function of the fuse. Invention points: (1) A separate fuse lead positioning groove is provided. The power lead positioned in the groove can be bent at two angles less than 90° at a position far from the root in the oral cavity of the positioning fuse, so that the power lead is led out from the cavity groove. No matter how large the external force is, the stress point can only be on the notch end wall passing through the fuse lead, without any potential risk of displacement of the fuse. (2) Greatly improves the working reliability of the fuse. (3) The two power leads with different polarities are respectively located in two different cavities, completely avoiding the hidden danger of short-circuit between the leads, and the use safety is also reliably improved, guaranteed and enhanced.

[0109] 5. (1) The temperature control is located in the cavity of the bracket seat. The temperature change of the temperature sensing surface of the temperature controller in the ventilation working state and the dry burning state when the abnormality occurs are not obvious. It takes a long recovery time for the temperature of the temperature sensing surface to reach the protection temperature. (2) The temperature difference between the ventilation state and the dry burning state is not obvious, which can easily lead to malfunction. (3) The temperature control cavity is placed in the bracket seat, which occupies a large space and can easily lead to interference between power lines and connection points of different polarities in the seat cavity, resulting in major safety accidents such as short circuit or creepage. 3. Effect of the invention: (1) The temperature difference of the temperature sensing surface of the temperature controller and the temperature fuse is significantly different in the normal working state of heating and ventilation and the abnormal state of heating without ventilation. That is, when the fan motor fails and causes the PTC heater to be in the abnormal working state of dry burning without wind, the temperature difference between the temperature controller and the temperature fuse located on the bracket surface and the ventilation and heating working state is more obvious. In the dry burning state without ventilation, the protection can be effectively disconnected instantly. (2) Because the temperature controller and the temperature fuse are directly exposed to the circulating natural wind for better heat dissipation in the ventilation working state, malfunction caused by the poor heat dissipation effect of the temperature controller and the temperature fuse's temperature sensing surface in the ventilation working state is reliably avoided. (3) The temperature controller and the temperature fuse are attached to the radiator surface of the PTC heating device and do not occupy the volume of the cavity where the electrode lead-out terminal and the power connection point are located in the first mounting bracket body, so that there is a larger installation space between the different polarity power lines and connection points of the temperature controller and the fuse and they are separated, effectively ensuring sufficient creepage distance and electrical clearance.

[0110] 6. (1) The small cavity extends in the opposite direction of the head of the heating device where the power supply is introduced, and does not occupy the volume of the base cavity, so that there is enough space between the power lines and connection points of the temperature controller and the fuse with different polarities to separate them and ensure sufficient creepage distance and electrical clearance, and the material cost is also low. (2) There is an insulating and heat-resistant isolation wall between the temperature controller's temperature sensing surface and the heating surface of the heating device. The temperature sensing surface is attached to the insulating isolation wall adjacent to the heating surface of the heating device, and there are no safety hazards such as leakage, creepage, and malfunction. (3) The small cavity, the power supply line, and all the live connection points are placed in the large cavity of the base, without interference of different polarities. It is impossible for water droplets to penetrate into the cavity containing the temperature controller and the temperature fuse, which greatly improves and enhances the reliability and safety of use. (4) When in ventilation mode, the cavity containing the thermostat / fuse has the same heat exchange conditions as the heating element, and the temperature is much lower than that in dry-burning without ventilation. This ensures that the temperature control protection temperature point is reached quickly in the abnormal dry-burning state without ventilation, and plays a role in sensitive protection and prevents malfunction in the working state due to the large temperature difference between the dry-burning state without ventilation and the ventilation state. This ensures the reliability of the product.

[0111] 7. (1) Greatly improves the sealing and insulation performance, which not only ensures the reliable sealing and insulation of the live parts, but also avoids the overflow and waste of the sealant. (2) Improves the operability and process consistency of mass production, and greatly improves the production efficiency. (3) In an environment where the electrical connection part and the power cord lead-out end are all immersed in water, it can still ensure that the live part of the heating device and its surface do not leak electricity. (4) Completely solves the problems of water seepage and electric leakage of the heater in a humid environment, and fundamentally solves the waterproof performance and the safety and reliability of use. Example: Structure diagram of the Midea model bracket.

[0112] 8. (1) The wire harness is tightly pressed and sealed through the sealing ring, and together with the sealant at the joint of the sealant, it completely eliminates the hidden danger of humid air and water droplets seeping into the cavity of the seat body. Even if the first bracket is immersed in water, it can still ensure that the live connection points in the cavity of the first bracket are completely sealed. Structurally, it completely solves the hidden dangers of electric leakage and short circuit in humid and immersion environments, and greatly improves the safety and reliability. (2) The third through hole forms an embedded fitting structure, which increases the fitting accuracy and bonding strength of each other.

[0113] 9. (1) When the heater works, the condensed water generated by the sudden change of the ambient temperature cannot penetrate into the internal part of the tail aluminum tube heating element, resulting in the accumulation of water droplets between the internal electrode plates or on the side area of the heating element, causing a short circuit. (2) Makes up for the fitting gap between the tail heating element and the radiator caused by tooling and human negligence during the device forming and curing process, eliminates the glue opening and degumming between the heating element and the radiator caused thereby, ensures the bonding strength of the heater, and guarantees the heat dissipation effect, safety and reliability. Improves the safety and reliability of the heating device.

[0114] 10. Makes up for the fitting gap between the tail heating element and the radiator caused by tooling and human negligence during the device forming and curing process, eliminates the glue opening and degumming between the heating element and the radiator caused thereby, ensures the bonding strength of the heater, and guarantees the heat dissipation effect, safety and reliability. Improves the safety and reliability of the heating device.

[0115] 11. (1) The joint gap between the seat body of the bracket and the heating device has double and enhanced sealing with sealant. (2) The chamfer or groove on the joint surface can effectively store the sealant with better fluidity, completely eliminate water seepage, and improve and enhance the waterproof performance. (3) The sealant stored at the chamfer increases the bonding area, improves the bonding strength, extends the service life, and eliminates the electric leakage and short circuit caused by humid and condensed water droplets. BRIEF DESCRIPTION OF THE DRAWINGS

[0116] Figure 1 It is a schematic structural diagram of the heat-conducting aluminum tube with columnar reinforcing ribs adopted by the present invention;

[0117] Figure 2Schematic diagram of the structure where the flat-free corrugated heat dissipation strip of the present invention is welded to the heat-conducting aluminum tube;

[0118] Figure 3 Schematic diagram of the cross-sectional structure of the heating core of the present invention;

[0119] Figure 4 Schematic diagram of the structure of the angled shovel-tooth type heating device of the present invention;

[0120] Figure 5 Schematic diagram of the structure of the heating device with a shoveled angled corner along the width direction of the present invention;

[0121] Figure 6 Schematic diagram of the structure of the heating device with a shoveled arcuate surface along the width direction of the present invention;

[0122] Figure 7 Schematic diagram of the structure of Embodiment 7 of the present invention;

[0123] Figure 8 Schematic diagram of the structure of Embodiment 8 of the present invention;

[0124] Figure 9 Schematic diagram of the existing TCL assembly;

[0125] Figure 10 Schematic diagram of the heating device of the radiator of the present invention where the heat-conducting flat sheet wraps the corrugated heat dissipation strip;

[0126] Figure 11 Schematic diagram of the structures of Embodiment 10 and Embodiment 11 of the present invention;

[0127] Figure 12 Schematic diagram of the structure of the present invention where the cover plate has semi-circular holes corresponding to the first mounting bracket;

[0128] Figure 13 Cross-sectional view of the chamfering and gluing at the joint of the cover plate and the first mounting bracket of the present invention;

[0129] Figure 14 Cross-sectional view of the cover plate being covered and the first mounting bracket pressing the sealant of the present invention;

[0130] Figure 15 Schematic diagram of the first mounting bracket of the present invention covering the cover plate and sleeving the heat shrinkable tube;

[0131] Figure 16 Schematic diagram of the structure of the first mounting bracket of the present invention adopting small pit bodies;

[0132] Figure 17 Schematic diagram of the structure of the first mounting bracket of the present invention adopting cavity;

[0133] Figure 18 Schematic diagram of the power cable harness of the present invention;

[0134] Figure 19 Schematic structural diagram of the power cord harness connected to the heating device of the present invention;

[0135] Figure 20 Schematic structural diagram of the second mounting bracket of the present invention;

[0136] Figure 21 Schematic diagram of the plug spring of the present invention. Detailed implementation manners

[0137] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0138] Embodiment 1

[0139] A PTC heating device includes a PTC heating core, a thin-walled flat and long hollow heat-conducting aluminum tube 1 and a radiator. The heating core is composed of a first electrode strip and a second electrode strip including a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets 3 juxtaposed and clamped by the heat-conducting surfaces of the electrode strips 2, a heat-resistant insulating silica gel 4 located between the PTC heating sheets 3 and the heat-conducting surfaces of the electrode strips 2, and a heat-resistant insulating film 5 covering the electrode strips 2 clamping the PTC heating element. The heat-resistant insulating silica gel 4 has at least two components, and at least one of the components is liquid at room temperature. The two silica gels are configured in a ratio of approximately 1:1 and fully mixed to form a synthetic silica gel with good fluidity. The preparation process of the heat-conducting aluminum tube 1 includes the following steps:

[0140] 1) Melting and softening aluminum ingots in a special melting furnace;

[0141] 2) Then stretching the softened aluminum liquid with a certain strength at the furnace mouth through a special die cavity to the outside of the furnace, and the die cavity is located at the furnace mouth of the melting furnace;

[0142] 3) The softened aluminum liquid is rapidly cooled during the uniform stretching process at room temperature environment to form a flat and long hollow heat-conducting aluminum tube.

[0143] The radiator 6 is a corrugated heat-dissipating strip. The heating core is inserted into the flat and long cavity of the heat-conducting aluminum tube 1 to form an aluminum tube heating body. By gradually rolling the heat-conducting plane of the heating body, all the gaps between the PTC heating sheets 3, the electrode strips 2 and the heat-resistant insulating film 5 in the heating core inserted into the cavity of the heat-conducting aluminum tube 1 and between the heat-conducting plane of the heating core and the inner wall of the heat-conducting aluminum tube 1 are eliminated and closely adhered to each other to form a PTC heating body. The heat-conducting plane of the PTC heating body is adhered to the corresponding heat-conducting plane of the heat-dissipating strip, and synthetic silica gel is applied at the adhered place. At a temperature of 150 - 300 °C and for a time of more than 5 minutes, the synthetic silica gel is completely cured, and the heat-conducting aluminum tube 1 heating body and the heat-dissipating strip are firmly bonded into one body.

[0144] The heat-conducting aluminum tube 1 heating element uses multiple groups of rollers to roll and press the entire heat-conducting surface of the heating element. The distance between the rolling surfaces of each group of rollers can be finely adjusted. After being successively rolled by each group of rollers, the thickness of the heating element gradually decreases by 0.01 - 0.25 mm respectively compared to before rolling.

[0145] Example 2

[0146] A PTC heating device includes a PTC heating core, a heat-conducting aluminum tube, and a radiator. The heat-conducting aluminum tube 1 has a heat-conducting plane 8 and a pressing surface 9. The wall thickness of the heat-conducting plane 8 is more than three times that of the pressing surface 9. The radiator includes heat-dissipating fins. The preparation process of the heat-conducting aluminum tube is as follows:

[0147] 1) Melting and softening aluminum ingots in a special melting furnace;

[0148] 2) Then stretching the softened aluminum liquid with a certain strength at the furnace mouth through a special die cavity to the outside of the furnace. The die cavity is located at the furnace mouth of the melting furnace;

[0149] 3) The softened aluminum liquid is rapidly cooled during the uniform stretching process at room temperature to form a flat and long hollow heat-conducting aluminum tube.

[0150] The radiator 6 is the heat-dissipating fins 10 cut from the wall thickness of the heat-conducting plane 8 of the heat-conducting aluminum tube 1. The heating core is composed of a first electrode strip and a second electrode strip including a conductive surface and a heat-conducting surface, several PTC heating sheets 3 juxtaposed and clamped by the heat-conducting surfaces of the electrode strips 2, a heat-resistant insulating silica gel 4, and a heat-resistant insulating film 5.

[0151] The wall thickness of the heat-conducting plane at the position where the heat-dissipating fins 10 are cut from the heat-conducting aluminum tube 1 is 3 mm. The width of the heat-dissipating fins 10 is 11.5 mm, and the height is 5 mm. On both sides of the heat-dissipating fins 10 on the heat-conducting plane of the heat-conducting aluminum tube 1 are positioning pressing surfaces 9 with a width smaller than that of the heat-dissipating fins. The wall thickness of the positioning pressing surface 9 is 0.1 mm, and the width is 0.5 mm. The wall thickness of the two side walls of the heat-conducting aluminum tube is 0.2 mm, and the thickness of the heat-dissipating fins 10 is 0.02 mm.

[0152] The heating core is composed of a first electrode strip and a second electrode strip each including a conductive surface and a heat-conducting surface, several PTC heating sheets 3 juxtaposed and clamped by the heat-conducting surfaces of the electrode strips 2, a heat-resistant insulating silica gel 4 located between the PTC heating sheets 3 and the heat-conducting surfaces of the electrode strips 2, and a heat-resistant insulating film 5 covering the electrode strips clamping the PTC heating element. After the heating core penetrates into the cavity of a heat-conducting aluminum tube 1 including heat-dissipating fins 10, by applying pressure to the pressing surface of the heat-conducting aluminum tube 1, the width gap between the heating core and the inner side wall of the cavity of the heat-conducting aluminum tube 1 is basically eliminated and then combined into the PTC heating device. The heat-dissipating aluminum tube 1 at the end of the power supply introduction end of the heating device extends 5 mm beyond the end of the heat-dissipating fins 10 corresponding to this end.

[0153] There is at least 1 folding surface 11 in the width direction of the heat-dissipating fins 10 on the heat-conducting aluminum tube 1, and the apex angle of the folding is 5 to 40 degrees.

[0154] Embodiment 3

[0155] A PTC heating device includes a PTC heating core, a heat-conducting aluminum tube 1 and a radiator. The heat-conducting aluminum tube 1 has a heat-conducting plane 8 and a pressing surface 9. The wall thickness of the heat-conducting plane 8 exceeds 3 times the wall thickness of the pressing surface 9. The radiator includes heat-dissipating fins 10. The preparation process of the heat-conducting aluminum tube 1 is as follows:

[0156] 1) Melting and softening aluminum ingots in a special melting furnace;

[0157] 2) Then stretching the softened aluminum liquid with a certain strength at the furnace mouth through a special die cavity to the outside of the furnace. The die cavity is located at the furnace mouth of the melting furnace;

[0158] 3) The softened aluminum liquid is rapidly cooled during the uniform stretching process in a room temperature environment to form a flat and long hollow heat-conducting aluminum tube.

[0159] The radiator 6 is the heat-dissipating fins 10 shoveled and cut from the wall thickness of the heat-conducting plane 8 of the heat-conducting aluminum tube 1. The heating core is composed of a first electrode strip and a second electrode strip each including a conductive surface and a heat-conducting surface, several PTC heating sheets 3 juxtaposed and clamped by the heat-conducting surfaces of the electrode strips 2, a heat-resistant insulating silica gel 4 and a heat-resistant insulating film 5.

[0160] The wall thickness of the heat-conducting plane 8 at the place where the heat-dissipating fins 10 are shoveled and cut on the heat-conducting aluminum tube 1 is 15 mm. The width of the heat-dissipating fins 10 is 24.5 mm, and the height is 17 mm. On both sides of the heat-dissipating fins 10 on the heat-conducting plane 8 of the heat-conducting aluminum tube 1 are positioning pressing surfaces 9 with a width smaller than the width of the heat-dissipating fins. The wall thickness of the positioning pressing surface 9 is 1.5 mm, and the width is 6 mm. The wall thickness of the two side walls of the heat-conducting aluminum tube 1 is 2.5 mm, and the thickness of the heat-dissipating fins 10 is 2.5 mm.

[0161] The heating core is composed of a first electrode strip and a second electrode strip each having a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets 3 juxtaposed and clamped by the heat-conducting surfaces of the electrode strips 2, a heat-resistant insulating silica gel 4 located between the PTC heating sheets 3 and the heat-conducting surfaces of the electrode strips, and a heat-resistant insulating film 5 covering the electrode strips 2 clamping the PTC heating element. After the heating core penetrates into the cavity of the heat-conducting aluminum tube 1 including the heat-dissipating fin 10, by pressing the pressing surface 9 of the heat-conducting aluminum tube 1, the width gap between the heating core and the inner side wall of the cavity of the heat-conducting aluminum tube 1 is basically eliminated, and then they are combined into the PTC heating device. The heat-dissipating aluminum tube 1 at the end of the power supply introduction end of the heating device extends 50 mm beyond the end of the heat-dissipating fin 10 corresponding to this end.

[0162] The heat-dissipating fin 10 has a generally arcuate surface 12 along the width direction of the heat-dissipating surface. The chord width of the arc surface 12 is 2 - 8 mm, and the height of the bow is 0.1 - 1.5 mm.

[0163] Example 4

[0164] A PTC heating device includes a heating core, a thin-walled flat and long hollow heat-conducting aluminum tube 1 and a radiator. The preparation process of the heat-conducting aluminum tube 1 includes the following steps:

[0165] 1) Melting and softening aluminum ingots in a special melting furnace;

[0166] 2) Then stretching the softened aluminum liquid with a certain strength at the furnace mouth through a special die cavity to the outside of the furnace. The die cavity is located at the furnace mouth of the melting furnace;

[0167] 3) The softened aluminum liquid is rapidly cooled during the uniform stretching process in a room temperature environment to form a flat and long hollow heat-conducting aluminum tube.

[0168] The heating core is composed of a first electrode strip and a second electrode strip each having a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets 3 juxtaposed and clamped by the heat-conducting surfaces of the electrode strips 2, a heat-resistant insulating silica gel 4 located between the PTC heating sheets 3 and the heat-conducting surfaces of the electrode strips, and a heat-resistant insulating film 5 covering the electrode strips 2 clamping the PTC heating element. The surface of the heat-conducting aluminum tube 1 has a heat-conducting plane 8 and a pressing surface 9 with substantially equal wall thicknesses. The radiator 6 is inlaid or welded on the heat-conducting plane 8 of the heat-conducting aluminum tube 1. After the heating core penetrates into the cavity of the heat-conducting aluminum tube 1 including the radiator 6, by pressing the pressing surface 9 of the heat-conducting aluminum tube 1, the width gap between the heating core and the inner side wall of the cavity of the heat-conducting aluminum tube 1 is basically eliminated simultaneously. The width of the pressing surface is 0.5 - 6 mm. The radiator 6 is positioned on the heat-conducting plane 8 of the heat-conducting aluminum tube 1 to form the PTC heating device.

[0169] Example 5

[0170] A PTC heating device includes a PTC heating core, a heat-conducting aluminum tube 1, and a radiator 6. The heating core is composed of a first electrode strip and a second electrode strip each having a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets 3 juxtaposed and clamped by the heat-conducting surfaces of the electrode strips 2, a heat-resistant insulating silica gel 4 located between the PTC heating sheets 3 and the heat-conducting surfaces of the electrode strips 2, and a heat-resistant insulating film 5 covering the electrode strips 2 that clamp the PTC heating elements. A part of the heating core at the electrode lead-out end 13 of the heating device extends beyond the end corresponding to the heat-conducting aluminum tube 1, and a heat-resistant insulating sealant 14 is coated around the joint of the insulating film 5 at the electrode lead-out end 13 of the heating core and the heat-conducting aluminum tube.

[0171] Example 6

[0172] As Figure 1 As shown, a PTC heating device includes a PTC heating core, a heat-conducting aluminum tube, and a radiator. The heating core is composed of a first electrode strip and a second electrode strip each having a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets 3 juxtaposed and clamped by the heat-conducting surfaces of the electrode strips 2, a heat-resistant insulating silica gel 4 located between the PTC heating sheets 3 and the heat-conducting surfaces of the electrode strips 2, and a heat-resistant insulating film 5 covering the electrode strips 2 that clamp the PTC heating elements. There is at least one columnar reinforcing rib 15 on the side of the heat-conducting aluminum tube 1 of the heating device. The columnar reinforcing rib 15 is roughly centered on the side of the heating body of the heat-conducting aluminum tube 1 and is as long as the heat-conducting aluminum tube 1. The cross-section of the columnar reinforcing rib 15 is a roughly arc shape with a chord width of 0.3 - 2 mm and an arch height of 0.2 - 2 mm.

[0173] Example 7

[0174] A PTC heating device includes a heat dissipation strip and a PTC heating sheet attached to the heat-conducting sheet of the heat dissipation strip as a group. There is a mixed silica gel between the heat-conducting plane of the heat-conducting sheet of the heat dissipation strip and the heating plane of the heating sheet. The mixed silica gel is composed of at least two components, and at least one of the components is liquid at room temperature. After being proportionally configured and fully mixed, the silica gel becomes a synthetic silica gel with good fluidity. At a temperature of 150 - 300 °C and for a time of more than 5 minutes, the synthetic silica gel is completely cured, binding the heat dissipation strip and the PTC heating sheet into the PTC heating device.

[0175] Example 8

[0176] An assembly of a PTC heating device, comprising a PTC heater composed of a PTC heating core, a heat-conducting aluminum tube 1 and a radiator, a first mounting bracket, a second mounting bracket 16, and an incoming power cable harness connected to a temperature controller 17 and a thermal fuse 18. The heating core includes a first electrode strip and a second electrode strip having a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets 3 juxtaposed and clamped by the heat-conducting surfaces of the electrode strips 2, a heat-resistant insulating silica gel 4 located between the PTC heating sheets 3 and the heat-conducting surfaces of the electrode strips 2, and a heat-resistant insulating film 5 covering the electrode strips 2 clamping the PTC heating element. The first mounting bracket has a seat body 19 and a cover 20. The seat body 19 has an open large cavity along the extending end of the electrode strip 2 of the heating device for accommodating the lead-out ends of the electrode strips 2 of different polarities of the heating device, the electrical connection part with the incoming power cable harness, and the connection of the power cable harness. There is also an open small cavity 22 separated by a positioning insulating wall 21 in the open large cavity. The small cavity 22 respectively accommodates and positions the heat-conducting surface at the end of the heating device, the temperature controller 17, or the thermal fuse 18. The temperature-sensing surfaces of the temperature controller 17 and the thermal fuse 18 are attached to one side of the positioning insulating wall 21 corresponding to the heat-conducting plane of the adjacent heating device. The angle between the cavities positioning the temperature controller 17 and the thermal fuse 18 and the heat-conducting surface at the end of the heating device is 0 - 90°.

[0177] On the adjacent side of the positioning insulating wall 21 of the open small cavity positioning the thermal fuse 18, there is an open positioning cavity groove 23 for accommodating the lead-out power lead of the thermal fuse 18.

[0178] On the positioning insulating wall 21 of the open small cavity 22 accommodating the thermal fuse 18 and the adjacent open positioning cavity groove 23 for accommodating the power lead of the thermal fuse 18, there is a notch 24 connecting the two cavities. The lead of the thermal fuse 18 is embedded and positioned in the lead positioning cavity groove 23 through this notch 24. The temperature controller 17, the thermal fuse 18, the incoming power cable harness, and all connection points positioned in the open large cavity of the bracket seat body 19 are sealed in the corresponding open large cavity by the cover 20.

[0179] The assembly has a first mounting bracket, a second mounting bracket 16, and a power cable harness connected to a temperature controller 17 and a thermal fuse 18. The first mounting bracket has a seat body 19 and a cover 20. There are chamfers or grooves at the four peripheral wall openings of the side wall of the cavity where the seat body 19 is combined with the accommodating and positioning of the lead-out end of the heating device.

[0180] The chamfers or grooves are recessed towards the side contacting the heating device, and a sealant 14 is coated in the chamfers or grooves to completely fill the gap at the joint between the four peripheral wall openings of the bracket side wall and the heating device.

[0181] The assembly includes a first and a second mounting bracket, and a power cable harness connected to a temperature controller 17 and a thermal fuse 18. The first mounting bracket has a base body 19 and a cover 20, and chamfers or grooves are provided around all the joint parts of the base body 19 and the cover 20.

[0182] The chamfers or grooves incline or dent towards the cavity side of the base body, and sealant is applied in the chamfers or grooves to completely coat the gaps at all the joints between the base body and the cover.

[0183] For the assembly of the PTC heating device, after the cover is put on the base body of the first mounting bracket, a heat-resistant and insulating heat shrinkable tube 25 is sleeved on. At a temperature of 70 - 120 degrees, the heat shrinkable tube 25 shrinks to fix and seal the bracket into a closed integral body without any mating gap on the surface.

[0184] The PTC heating device is composed of multiple groups in parallel combination.

[0185] Embodiment 9

[0186] An assembly of a PTC heating device includes a PTC heater composed of a PTC heating core, a heat-conducting aluminum tube 1 and a radiator, a first mounting bracket, a second mounting bracket 16, and a power cable harness for introducing and connecting a temperature controller 17 and a thermal fuse 18. The heating core has a first electrode strip and a second electrode strip including a conductive surface and a heat-conducting surface, several PTC heating sheets 3 juxtaposed and clamped by the heat-conducting surfaces of the electrode strips 2, a heat-resistant insulating silicone 4 between the PTC heating sheets 3 and the heat-conducting surfaces of the electrode strips 2, and a heat-resistant insulating film 5 covering the electrode strips 2 clamping the PTC heating elements. The first mounting bracket has a base body 19 and a cover 20. The base body 19 has a first cavity 26 along the extended ends of the electrode strips 2 of the heating device for accommodating the electrical connection parts of the lead-out ends of the electrode strips of different polarities of the heating device and the power cable harness and the connection wires of the power cable harness, and an insert sleeve, and a second cavity for accommodating the end part of the radiator of the heating device. There is also a small pit 28 for accommodating and positioning the temperature controller 17 and the thermal fuse 18 at the wall thickness part of the second cavity that fits the heat dissipation surface of the end part of the radiator 6. The depth of the small pit 28 is much smaller than the lengths of the temperature controller 17 and the thermal fuse 18.

[0187] The length of the open surface of the small pit 28 is close to the lengths of the temperature controller 17 and the thermal fuse 18.

[0188] There is a positioning cavity groove 23 for accommodating the power lead of the fuse 18 adjacent to one side of the positioning wall of the small pit 28 for positioning the thermal fuse 18.

[0189] The isolation wall of the small pit 28 that houses the thermal fuse 18 and the positioning cavity 23 adjacent to the power supply lead of the thermal fuse 18 has a notch 24 that penetrates the pit 28 and the positioning cavity 23. The lead of the thermal fuse 18 is embedded and positioned in the positioning cavity 23 of the power supply lead through this notch 24.

[0190] The assembly has a first mounting bracket, a second mounting bracket 16, and a power cord bundle connected to a temperature controller 17 and a thermal fuse 18. The first mounting bracket has a base 19 and a cover 20. The periphery of the base 19 at the wall openings around the side wall of the cavity that houses and positions the junction of the lead-out end of the heating device has chamfers or grooves.

[0191] The chamfers or grooves are recessed towards the side in contact with the heating device, and a sealant 14 is applied in the chamfers or grooves to completely fill the gap at the junction between the peripheral wall openings of the bracket side wall and the heating device.

[0192] The assembly has a first and a second mounting bracket and a power cord bundle connected to a temperature controller 17 and a thermal fuse 18. The first mounting bracket has a base 19 and a cover 20. The periphery of all the joints between the base 19 and the cover 20 has chamfers or grooves.

[0193] The chamfers or grooves are inclined or recessed towards the cavity side of the base. A sealant is applied in the chamfers or grooves to completely cover the gaps at all the joints between the base and the cover.

[0194] For the assembly of the PTC heating device, after the cover is placed on the base of the first mounting bracket, a heat-resistant and insulating heat shrinkable sleeve 25 is put on. At a temperature of 70 - 120 degrees, the heat shrinkable sleeve 25 shrinks to fix and seal the bracket into a closed integral body with no mating gaps on the surface.

[0195] The PTC heating device is composed of multiple groups in parallel combination.

[0196] Embodiment 10

[0197] An assembly of a PTC heating device, including a PTC heater composed of a PTC heating core, a heat-conducting aluminum tube 1 and a radiator 6, a first mounting bracket, a second mounting bracket 16, and an incoming power supply wire harness connecting a temperature controller 17 and a temperature fuse 18. The heating core includes a first electrode strip and a second electrode strip with a conductive surface and a heat-conducting surface, several PTC heating sheets 3 juxtaposed and clamped by the heat-conducting surfaces of the electrode strips 2, a heat-resistant insulating silica gel 4 located between the PTC heating sheets 3 and the heat-conducting surfaces of the electrode strips 2, and a heat-resistant insulating film 5 covering the electrode strips 2 clamping the PTC heating element. The first mounting bracket has a seat body 19 and a cover 20. The seat body 19 has an open large cavity along the extending end of the electrode strip 2 of the heating device for accommodating the lead-out ends of the electrode strips 2 of different polarities of the heating device, the electrical connection part of the incoming power supply wire harness, and the wire connection of the power supply wire harness. The open large cavity has a cavity 29 for accommodating the temperature controller 17 or the temperature fuse 18 along one side of the thickness of the side of the heating device.

[0198] The depth of the cavity 29 is close to the length of the temperature controller 17 or the temperature fuse 18 and is in close contact with the heat-conducting surface of the heating device.

[0199] The open cross-section of the cavity 29 is perpendicular to the length direction of the heating device and is larger than the cross-section of the temperature controller 17 or the temperature fuse 18.

[0200] The temperature controller 17 or the temperature fuse 18 is inserted into the cavity from the open end of the corresponding small cavity, and their incoming power supply wire harnesses are all positioned and accommodated in the open large cavity of the seat body. After the seat body 19 and the cover 20 close the open large cavity, the open part of the small cavity, the live connection part of the power supply wire harness, and all the leads of different polarities are reliably sealed in the open large cavity of the bracket.

[0201] The cavity 29 is parallel to the heat-conducting surface of the heating device.

[0202] There are no less than two groups of the heating devices, and the cavity 29 is located between and in contact with the heat-conducting planes of two adjacent groups of heating devices.

[0203] The assembly has a first mounting bracket, a second mounting bracket 16, and a power supply wire harness connecting a temperature controller 17 and a temperature fuse 18. The first mounting bracket has a seat body 19 and a cover 20. There are chamfers or grooves at the four peripheral wall openings of the side wall of the cavity where the seat body 19 combines with the lead-out ends of the heating device for accommodating and positioning.

[0204] The chamfers or grooves are recessed toward the side in contact with the heating device, and a sealant 14 is coated in the chamfers or grooves to completely fill the gaps at the joints between the four peripheral wall openings of the bracket side wall and the heating device.

[0205] The assembly has a first and a second mounting bracket and a power cable harness connected to a temperature controller 17 and a thermal fuse 18. The first mounting bracket has a base body 19 and a cover 20, and chamfers or grooves are provided around all the joint parts of the base body 19 and the cover 20.

[0206] The chamfers or grooves incline or dent towards the cavity side of the base body, and a sealant is coated in the chamfers or grooves to completely cover the gaps at all the joints between the base body and the cover.

[0207] For the assembly of the PTC heating device, after the cover is put on the base body of the first mounting bracket, a heat-resistant and insulating heat shrinkable sleeve 25 is sleeved on. At a temperature of 70 - 120 degrees, the heat shrinkable sleeve 25 shrinks to fix and seal the bracket into a closed integral body without any mating gaps on the surface.

[0208] The PTC heating device is composed of multiple groups in parallel combination.

[0209] Embodiment 11

[0210] An assembly of a PTC heating device includes a PTC heater composed of a PTC heating core, a heat-conducting aluminum tube 1 and a radiator 6, a first mounting bracket, a second mounting bracket 16 and an introduced power cable harness connected to a temperature controller 17 and a thermal fuse 18. The heating core has a first electrode strip and a second electrode strip including a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets 3 juxtaposed and clamped by the heat-conducting surfaces of the electrode strips 2, a heat-resistant insulating silica gel 4 located between the PTC heating sheets 3 and the heat-conducting surfaces of the electrode strips 2, and a heat-resistant insulating film 5 covering the electrode strips 2 clamping the PTC heating elements. The first mounting bracket has a base body 19 and a cover 20. The base body 19 has a large open cavity. After the electrically connected parts of different polarities are positioned in the large open cavity, an insulating sealant fills and seals all the electrically connected parts of the lead-out electrode strips 2 of the heating device and the power cable harness connected thereto and the corresponding voids.

[0211] There are limiting insulating walls 30 along the outer sides of the extending ends of the lead-out ends of the electrode strips of different polarities of the heating device in the large open cavity. The lead-out electrode strips 2 of the heating device filled and sealed with the insulating sealant 14, the electrically connected parts of the power cable harness connected thereto, and the corresponding insulating sealant are all positioned in the small open cavity surrounded by the limiting insulating walls 30.

[0212] Insulating heat shrinkable sleeves are sleeved on the surfaces of the lead-out ends of the electrode strips of different polarities and the corresponding electrically connected parts positioned in the large open cavity, and an insulating sealant 14 fills and seals all the lead-out ends of the electrode strips 2 covered therein, the electrically connected parts connected thereto, and the corresponding voids.

[0213] The assembly includes a first mounting bracket, a second mounting bracket 16, and a power cable harness connected to a temperature controller 17 and a thermal fuse 18. The first mounting bracket has a base body 19 and a cover 20. The peripheral wall openings at the four sides of the cavity side wall that accommodates and positions the junction of the lead-out ends of the heating device have chamfers or grooves.

[0214] The chamfers or grooves are recessed toward the side contacting the heating device, and a sealant 14 is filled in the chamfers or grooves to completely cover the gaps at the junctions between the peripheral wall openings of the bracket side wall and the heating device.

[0215] The assembly includes a first and a second mounting bracket and a power cable harness connected to a temperature controller 17 and a thermal fuse 18. The first mounting bracket has a base body 19 and a cover 20. Chamfers or grooves are provided around all the joint parts of the base body 19 and the cover 20.

[0216] The chamfers or grooves are inclined or recessed toward the cavity side of the base body, and a sealant is filled in the chamfers or grooves to completely cover the gaps at all the joints between the base body and the cover.

[0217] For the assembly of the PTC heating device, after the cover is placed on the base body of the first mounting bracket, a heat-resistant and insulating heat shrinkable sleeve 25 is then put on. At a temperature of 70 - 120 degrees, the heat shrinkable sleeve 25 shrinks to fix and seal the bracket into a closed integral body without any mating gaps on the surface.

[0218] The PTC heating device is composed of multiple groups in parallel combination.

[0219] Embodiment 12

[0220] An assembly of a PTC heating device, an assembly containing a PTC heating device. In the large open cavity of the first bracket, there are positioning slots for positioning the different-polarity power connection wires of the temperature controller 17 and the thermal fuse 18 connected to the input power supply. There is a partition wall 32 on one side of the positioning slots for accommodating and fixing the power connection wires.

[0221] The assembly includes a first mounting bracket, a second mounting bracket 16, and a power cable harness connected to a temperature controller 17 and a thermal fuse 18. The first mounting bracket has a base body 19 and a cover 20. The peripheral wall openings at the four sides of the cavity side wall that accommodates and positions the junction of the lead-out ends of the heating device have chamfers or grooves.

[0222] The chamfers or grooves are recessed toward the side contacting the heating device, and a sealant 14 is filled in the chamfers or grooves to completely cover the gaps at the junctions between the peripheral wall openings of the bracket side wall and the heating device.

[0223] The assembly comprises a first and a second mounting bracket and a power harness connected to a temperature controller 17 and a temperature fuse 18. The first mounting bracket comprises a base 19 and a cover 20. All joints between the base 19 and the cover 20 are chamfered or grooved.

[0224] The chamfer or groove is inclined or recessed toward one side of the cavity of the base body, and sealant is poured into the chamfer or groove to completely cover all gaps at all joints between the base body and the cover.

[0225] The assembly of the PTC heating device is constructed by covering the base of the first mounting bracket with a cover and then putting on a temperature-resistant, insulating heat shrink tubing 25. At a temperature of 70-120 degrees, the heat shrink tubing 25 shrinks, fixing and sealing the bracket into a sealed whole with no surface clearance.

[0226] The PTC heating device is composed of multiple groups connected in parallel.

[0227] Example 13

[0228] A PTC heating device assembly includes a PTC heating device, a first mounting bracket, a second mounting bracket 16, and an incoming power supply wiring harness connected to a temperature controller 17 and a temperature fuse 18. The first mounting bracket has a base 19 and a cover 20. The rear end face of the base 19 has a first through hole 33 that is approximately semicircular. The cover 20 has an extension 34 perpendicular to the cover 20 at a position corresponding to the first through hole 33 on the rear end face of the base 19. The extension 34 has a second through hole corresponding to the first through hole 33 on the rear end face of the base.

[0229] The power wiring harness is composed of the wires inserted into the insulating sleeve 25, and a rubber sealing ring 36 is embedded in the insulating sleeve 25. The rubber sealing ring 36 and the power wiring harness embedded and covered by it are positioned together in the first through hole 33 and the second through hole. When the cover 20 covers the base 19, the first through hole 33 and the second through hole are matched to form a roughly circular third through hole. By pressing the cover, the rubber sealing ring 36 embedded in the third through hole is tightly compacted, so that a sealed fit without any gap is formed between the rubber sealing ring 36, the insulating sleeve 25 covered by it, and the wire.

[0230] The sealing ring 36 has at least one opening around it. Before closing and tightening the cover, the following steps can be followed:

[0231] 1) Insert the rubber sealing ring into the third through hole of the base body;

[0232] 2) Open the opening of the rubber seal ring and insert the power harness;

[0233] 3) Reset the opening of the split sealing ring and wrap the entire power cord harness.

[0234] 4) Cover the cover, and the first and second through holes are aligned to form a substantially circular third through hole, so that the wire is firmly pressed inside the sealing ring and the gap is reliably sealed.

[0235] The voids at the positioning and joint of the third through hole, the sealing ring 36 and the wire harness are all filled with an insulating and sealing glue 14.

[0236] The assembly has a first mounting bracket, a second mounting bracket 16, and a power cord harness connected with a temperature controller 17 and a thermal fuse 18. The first mounting bracket has a seat body 19 and a cover 20. There are chamfers or grooves at the four peripheral wall openings of the side wall of the cavity where the seat body 19 is combined with the lead-out end of the heating device for accommodation and positioning.

[0237] The chamfer or groove is recessed toward the side contacting the heating device, and the chamfer or groove is filled with a sealing glue 14 that completely fills the gap at the joint between the four peripheral wall openings of the bracket side wall and the heating device.

[0238] The assembly has a first and a second mounting bracket and a power cord harness connected with a temperature controller 17 and a thermal fuse 18. The first mounting bracket has a seat body 19 and a cover 20. There are chamfers or grooves around all the joint parts of the seat body 19 and the cover 20.

[0239] The chamfer or groove is inclined or recessed toward the cavity side of the seat body, and the chamfer or groove is filled with a sealing glue that coats all the gaps at the joints between the seat body and the cover.

[0240] For the assembly of the PTC heating device, after covering the cover on the seat body of the first mounting bracket, then put on a temperature-resistant and insulating heat shrinkable sleeve 25. At a temperature of 70 - 120 degrees, the heat shrinkable sleeve 25 shrinks to fix and seal the bracket into an airtight whole without any mating gaps on the surface.

[0241] The PTC heating device is composed of multiple groups in parallel combination.

[0242] Embodiment 14

[0243] An assembly of a PTC heating device, including a PTC heating device, a first mounting bracket, a second mounting bracket 16, and an introduced power cord harness connected with a temperature controller 17 and a thermal fuse 18. The first mounting bracket has a seat body 19 and a cover 20. The surfaces of the lead-out ends of the electrode plates 2 with different polarities and the charged parts of the connection parts of the power cord harness are covered with insulating sleeves 37, and a temperature-resistant and insulating sealing glue 14 is coated on the surfaces of the insulating sleeves 37 and the charged bodies of the connection parts of the electrode plates 2 lead-out ends and the power cord harness.

[0244] The connection method of the connection part is the insertion between the spring clip 38 riveted on the wire harness and the insert piece 39 connected to the lead-out end of the electrode piece 2.

[0245] The insulating sleeve 37 is an insulating rubber sheath matching the spring clip 38.

[0246] The connection method of the connection part is that the wire group is directly crimped on the lead-out end of the electrode piece 2.

[0247] The insulating sleeve is a heat-resistant heat-shrinkable tube.

[0248] The assembly includes a first mounting bracket, a second mounting bracket 16, a power wire harness connected with a temperature controller 17 and a temperature fuse 18. The first mounting bracket has a seat body 19 and a cover 20. There are chamfers or grooves at the four peripheral wall openings of the side wall of the cavity where the seat body 19 combines with the cavity for accommodating and positioning the lead-out end of the heating device.

[0249] The chamfer or groove is recessed towards the side contacting the heating device, and a sealant 14 is poured and coated in the chamfer or groove to completely fill the gap at the joint between the four peripheral wall openings of the bracket side wall and the heating device.

[0250] The assembly includes a first and a second mounting bracket and a power wire harness connected with a temperature controller 17 and a temperature fuse 18. The first mounting bracket has a seat body 19 and a cover 20. There are chamfers or grooves around all the joint parts of the seat body 19 and the cover 20.

[0251] The chamfer or groove inclines or is recessed towards the cavity side of the seat body, and a sealant is poured and coated in the chamfer or groove to completely coat the gap at all the joints between the seat body and the cover.

[0252] For the assembly of the PTC heating device, after the cover is put on the seat body of the first mounting bracket, a heat-resistant and insulating heat-shrinkable tube 25 is sleeved. At a temperature of 70 - 120 degrees, the heat-shrinkable tube 25 shrinks to fix and seal the bracket into an airtight whole without any fitting gap on the surface.

[0253] The PTC heating device is composed of multiple groups in parallel combination.

[0254] Example 15

[0255] An assembly of a PTC heating device includes a PTC heating device, a first mounting bracket, a second mounting bracket 16, and a power wire harness connected with a temperature controller 17 and a temperature fuse 18. The second mounting bracket 16 is inserted and sleeved at the tail end of the heating device, and the tail part of the non-electrode lead-out end of the heating device is coated with a heat-resistant sealant 14 to completely seal the gap at the tail end of the heating device.

[0256] The heat-conducting aluminum tube 1 at the tail end of the heating device extends beyond the tail end of the heating device by 0.5-10 mm. The bottom surface of the cavity of the second mounting bracket has a cavity for accommodating the extending portion of the tail end of the heat-conducting aluminum tube 1, and the cavity is filled with insulating sealant 14.

[0257] The cavity sidewall where the second mounting bracket 16 is joined to the sleeved heating element has chamfers or grooves around its periphery.

[0258] The chamfer or groove is inclined or recessed toward the inner side contacting the tail end of the heating element, and the chamfer or groove is filled with sealant 14 to completely fill the gap between the surrounding wall openings of the bracket side wall and the junction of the heating element.

[0259] The assembly includes a first mounting bracket, a second mounting bracket 16, and a power harness connected to a temperature controller 17 and a temperature fuse 18. The first mounting bracket has a base 19 and a cover 20. The base 19 and the side wall of the cavity that accommodates and positions the lead-out end of the heating device are connected with chamfers or grooves.

[0260] The chamfer or groove is recessed toward the side contacting the heating element, and a sealant 14 is poured into the chamfer or groove to completely fill the gap between the peripheral wall openings of the bracket side wall and the junction of the heating element.

[0261] The assembly comprises a first and a second mounting bracket and a power harness connected to a temperature controller 17 and a temperature fuse 18. The first mounting bracket comprises a base 19 and a cover 20. All joints between the base 19 and the cover 20 are chamfered or grooved.

[0262] The chamfer or groove is inclined or recessed toward one side of the cavity of the base body, and sealant is poured into the chamfer or groove to completely cover all gaps at all joints between the base body and the cover.

[0263] The assembly of the PTC heating device is constructed by covering the base of the first mounting bracket with a cover and then putting on a temperature-resistant, insulating heat shrink tubing 25. At a temperature of 70-120 degrees, the heat shrink tubing 25 shrinks, fixing and sealing the bracket into a sealed whole with no surface clearance.

[0264] The PTC heating device is composed of multiple groups connected in parallel.

[0265] Example 16

[0266] An electrical appliance comprises a PTC heating element and an assembly.

[0267] The electrical appliance is at least one selected from an air conditioner, a heater, a hot air curtain machine, a bathroom heater, a dehumidifier, an air purifier, a clothes dryer, a new energy vehicle heater or a defogging and defrosting device.

Claims

1. An assembly of a PTC heating device, characterized in that: A PTC heater composed of a PTC heating core, a heat-conducting aluminum tube and a radiator, a first mounting bracket, a second mounting bracket, and an incoming power supply wire harness connecting a temperature controller and a temperature fuse. The heating core includes a first electrode strip and a second electrode strip having a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets juxtaposed and clamped by the heat-conducting surfaces of the electrode strips, a heat-resistant insulating silica gel located between the PTC heating sheets and the heat-conducting surfaces of the electrode strips, and a heat-resistant insulating film covering the electrode strips clamping the PTC heating element. The first mounting bracket has a seat body and a cover. The seat body has a first cavity and an insert sleeve for accommodating the electrical connection part of the outgoing ends of the heating device's different-polarity electrode strips and the incoming power supply wire harness and the wire connection of the power supply wire harness along the extending ends of the heating device's electrode strips, and a second cavity for accommodating the end of the radiator of the heating device. There is also a small pit for accommodating and positioning the temperature controller and the temperature fuse at the wall thickness where the second cavity fits the heat-dissipating surface of the radiator end. The depth of the small pit is much smaller than the lengths of the temperature controller and the temperature fuse.

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

3. The assembly of the PTC heater according to claim 2, characterized in that: There is a positioning cavity groove for accommodating the power supply lead of the fuse adjacent to the positioning wall of the small pit for positioning the temperature fuse.

4. The assembly of the PTC heating device according to any one of claims 1 to 3, characterized in that: There is a notch connecting the pit and the positioning cavity groove on the partition wall between the small pit for accommodating the temperature fuse and the positioning cavity groove for the adjacent power supply lead of the temperature fuse. The lead of the temperature fuse is embedded and positioned in the positioning cavity groove of the power supply lead through this notch.

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