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 thermal-sensitive ceramic heater and an assembly of the heater, in particular to a PTC heating device having a heat-conducting aluminum tube with main body reinforcing ribs on the side and an assembly thereof. Background Art

[0002] A PTC thermistor ceramic electric heater bracket and PTC electric heater (publication number CN201174784) includes a mounting surface and a support surface. The support surface has a concave cavity for mounting and fixing the heater. The bottom of the concave cavity also has an inwardly extending cavity for accommodating the heater's power lead-out wires. The support surface at the bottom of the cavity has a wire lead-out hole. A through-hole for accommodating a fuse is provided on one sidewall of the support surface.

[0003] This technical solution can combine the fuse with the bracket to prevent it from being connected to the periphery of the bracket and affecting safety. However, since it is still installed on a side wall of the support surface, its connecting wire will still be entangled outside the bracket, and the power lead still has the risk of loosening and falling off under the action of external force.

[0004] A PTC heater support base and a PTC heater (publication number: CN200920235929) include a base, a cover plate, and screws; the base and the cover plate are fixedly connected by screws; an open cavity is provided in the base, and an upper partition wall and a lower partition wall are provided in the cavity; the upper partition wall is located between the heating element of the PTC heater and the temperature controller; and the lower partition wall is located between the heating element of the PTC heater and the temperature fuse.

[0005] This technical solution allows the temperature controller and temperature fuse to be installed within the bracket, resolving the reliability issue of thermostat and fuse positioning. However, since the lead wires can easily loosen and fall off under repeated external forces, the live parts of the connecting surface between the two electrodes of different polarities and the wire group can also cause short circuits, and poor crimping can lead to contact sparks or loosening.

[0006] In the PTC heater (Publication No. 104053255A), two or more heaters share a tailstock and electrical connector. The temperature controller and temperature fuse are secured within the bare electrical connector, then plugged into the electrical socket and electrical shield. This technology addresses the positioning issues of the temperature controller and fuse within the tailstock within the electrical connector, but it still doesn't address safety and reliability concerns related to displacement and interference between components within the bracket body and between power leads.

[0007] The above existing technologies all have the problem that the power connection wire of the thermistor ceramic heater is not effectively insulated and fixed after being led out, and is easily affected by pulling. At the same time, the power connection wire inside the mounting bracket is also easily affected by external pulling.

[0008] In addition, the thermal ceramic heater materials used in existing cabinet air conditioners are either single groups or multiple groups connected in parallel. After the power connection wires are led out, they interfere with each other and have no effective insulation fixation. They are affected by the assembly and transportation of the whole machine, and are prone to safety accidents such as falling off and short circuits.

[0009] A PTC liquid electric heater (publication number CN2612898Y), wherein the power line is connected to the electrode and supplies power thereto, and the power line is connected to the outside world through the power line inlet of the metal shell.

[0010] With this technical solution, since the power line is directly connected to the electrode, the contact resistance is large, and the connection point of the power line is easily caused to fall off under the action of external force.

[0011] A PTC-heated instant electric water heater (publication number CN2742335Y) has a conductor on an electrical control device connected to a plug on a heating device.

[0012] Using this technical solution, the connection between the wire and the PTC electrode sheet must be completed with the help of at least a plug, a spring and a sheath to ensure its safety. At the same time, the insertion requirements of the plug are very high. If the connection with the fitting part is not completed, the plug may easily fall off the PTC electrode sheet and cause damage to the heater.

[0013] A PTC heater with fixed terminals (publication number CN2684506Y) features a clip attached to the terminal, which is connected to the electrode plate by stamping. With this technical solution, the clip acts as a plug, and the stamping distance needs to be adjusted in real time. This inevitably creates a contact gap between the plug and the spring. If the plug is not fully connected, it can easily fall off the PTC electrode or spring, causing the heater to not conduct. Real-time adjustments require additional manual attention, increasing costs.

[0014] In addition, the prior art also has a connection scheme that uses a connecting piece with a flanged or angled crimping surface and a heating strip electrode sheet to be stamped. Although this scheme can solve the problem of reliable crimping of the wire assembly and the connecting piece, since the flanged or angled crimping surface and the electrode sheet are in surface contact, any slight unevenness in the mutual fit can easily lead to loose fit and cause detachment. In addition, the flat punch of the stamping die simultaneously applies impact pressure to both sides of the flanged or angled surface. Since the contact point between the electrode sheet and the flanged or angled surface is a line contact, the indentation is also concentrated there. If the stamping die has a slight unevenness, it will cause damage and breakage of the electrode sheet on the indentation line, resulting in the scrapping of the entire heating strip and wire assembly.

[0015] In summary, the connection methods of the power cord and the electrode sheets in the above-mentioned prior art all have many safety and reliability risks such as poor contact, loose crimping, and damaged stamping.

[0016] Prior Art: Conductive adhesive is used between the heating element and the electrode sheet. However, since the adhesive contains a large amount of metallic conductive powder, the adhesive's bonding strength is significantly reduced. 2. Silicone gel, which solidifies naturally at room temperature, is used, resulting in high production and storage costs and inconvenience. 3. Existing heating cores have grooves formed on the sides after rolling, which improves contact between the heating element, the electrode sheet, and the heating surface of the aluminum tube, thereby increasing thermal efficiency.

[0017] Disadvantages of existing technologies: 1. Xinye CN00221004: (1) Although it is set to be installed on the side wall, front wall or top wall of the bracket and to be inserted in multiple ways such as forward, backward, left or right, the premise is that the temperature control sensing surface must be close to the heat dissipation strip with electricity on the surface, which is prone to safety accidents such as short circuit and leakage. It is unreliable and difficult to operate and install. (2) The two sockets of the temperature control and fuse are respectively deep into the inner wall of the cavity of the bracket, so that the power lead and the electrical connection point can only be exposed outside the bracket. (3) The cover plate is only used to support the positioning function of the temperature controller and cannot solve the problem of the exposed connection point of the live part, which brings great hidden dangers to the safety and reliability of use. 2. Xu Chengdong CN201420064071: The cover plate is exposed in the space on the surface of the bracket, which easily causes water droplets to penetrate into the cavity of the positioning temperature control and fuse, bringing safety hazards. 3. Guowei 200920235929: (1) The temperature controller is located in the cavity of the bracket body. The temperature change of the thermostat's temperature sensing surface in the ventilation state and the dry-burning state when the heating device is abnormal is not obvious. It takes a long time to recover 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 body, which occupies a large space and can easily cause interference between power lines and connection points of different polarities in the body cavity, resulting in short circuits or creepage and other major safety accidents.

[0018] 1. 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.

[0019] Existing technologies: (1) There is no sealant inside the tail bracket cavity. Condensation generated by the sudden change in ambient temperature during operation can easily penetrate into the tail aluminum tube heating element, causing a short circuit. (2) Linzhi CN302536477S has an unsealed step at the tail that cannot accommodate sealant. (3) The tail of the aluminum tube heating element is flush with or lower than the tail of the radiator.

[0020] Prior Art: Gree CN201010245871: (1) All power contacts are exposed on the surface of the bracket, which cannot solve the problems of sealing and leakage in humid environments, making it unsafe to use. (2) The joint between the bracket and the heater has no chamfers or grooves. (3) There is no sealant at the joint, and the gap between the joint is prone to water seepage, which cannot ensure sealing performance and prevent water seepage and leakage in humid environments, making it unsafe to use. Summary of the Invention

[0021] Purpose of the invention: The purpose of the present invention is to solve the problem that the heating element in the tube of the existing PTC heating device is loosened due to the release of thermal stress caused by instantaneous hot and cold shocks during the frequent startup, heating and shutdown cooling process, resulting in a gap between the heating element and the conductive electrode and the insulating layer in the tube, and the contact gap is often caused by sparking and carbonization between the heating element and the electrode sheet, and even local high temperature caused by long-term sparking causes the melting of the insulating layer, resulting in surface charging and leakage, short circuit and breakdown, explosion, burning of flammable plastic indoor units and other major and serious safety accidents.

[0022] Technical solution: A PTC heating device includes a PTC heating core, a thin-walled, elongated, hollow, heat-conducting aluminum tube, and a radiator. The heating core includes a first electrode strip and a second electrode strip having conductive and heat-conducting surfaces, a plurality of PTC heating sheets sandwiched in parallel 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 sandwiching the PTC heating element. The heat-resistant insulating silica gel has at least two components, at least one of which 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) Melt and soften the aluminum ingot in a special melting furnace;

[0024] 2) The softened aluminum liquid with a certain strength at the furnace mouth is then stretched out of the furnace through a dedicated mold cavity, wherein the mold 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 at room temperature to form a flat and long hollow heat-conducting aluminum tube.

[0026] Furthermore, the radiator is a corrugated heat dissipation strip, and the heating core is inserted into the long and flat cavity of the heat-conducting aluminum tube to form an aluminum tube heating element. The heat-conducting surface of the heating element is gradually rolled to eliminate all gaps between the PTC heating sheet, electrode strip and temperature-resistant insulating film in the heating core that penetrates the cavity of the heat-conducting aluminum tube, and between the heating core and the heat-conducting surface of the inner wall of the heat-conducting aluminum tube, and they are tightly attached to each other to form a PTC heating element. The heat-conducting surface of the PTC heating element is attached to the heat-conducting surface corresponding to the heat dissipation strip, and synthetic silicone is applied at the attachment point. The synthetic silicone is completely cured at a temperature of 150 to 300°C for more than 5 minutes to firmly bond the heat-conducting aluminum tube heating element and the heat dissipation strip into one.

[0027] Furthermore, the heat-conducting aluminum tube heating element adopts multiple groups of rollers to roll and crush the entire heat-conducting surface of the heating element, and the distance between the rolling surfaces of each group of rollers can be fine-tuned. After each group of rollers rolls in turn, the thickness of the heating element is gradually reduced by 0.01 to 0.25 mm compared with before rolling.

[0028] Existing technology: According to rights 1 to 2, there is conductive glue between the heating sheet and the electrode sheet. Since the conductive glue contains a large amount of metal conductive powder, the bonding strength of the glue is greatly reduced. 2. Silica gel that solidifies quickly and naturally at room temperature is used. The production and storage costs are also high, and it is not convenient to use. 3. The existing heating core is formed with grooves on the side after rolling, which has a positive effect on improving the contact between the heating element and the electrode sheet and the heating surface of the aluminum tube, and improving thermal efficiency. The present invention can greatly improve and enhance the bending caused by the stress released due to the change in thickness of the heating core after rolling, and ensure that the product is straight and non-deformed after rolling. For units with a length of 500-1000mm or more (hang-up units and cabinet units between 1.5HP and 5HP), the side reinforcement ribs can greatly improve the bending and flexural strength, and effectively eliminate and reduce deformation caused by external forces during turnover, transportation, and installation. In addition, the side reinforcement ribs can greatly improve and enhance the coating strength between the heat-conducting aluminum tube and the heating element, conductive electrode sheet and insulation layer covered therein, and effectively eliminate the loosening of the heat-conducting aluminum tube caused by the release of thermal stress caused by instantaneous hot and cold changes in the heating element in the tube during the frequent startup-heating-shutdown cooling process, resulting in gaps between the heating element and the conductive electrode and insulation layer in the tube, and the resulting contact gaps. Commonly, due to sparkover and carbonization between the heating element and the electrode sheet, or even local high temperature caused by long-term sparkover that causes the melting of the insulation layer, resulting in surface charging and leakage, short circuit and breakdown, explosion, burning of flammable plastic indoor units and other major and serious safety accidents. (1) Since the size of the indentation of the aluminum tube into the inner cavity of the aluminum tube during the rolling process after the tube is inserted is smaller than that without the reinforcement ribs, the safety hazard of the insulation film being damaged by the side tube wall during the pressing process can be reduced; (2) The side reinforcement ribs are more conducive to eliminating the irregular extension of the aluminum tube along the length and width directions in the process of eliminating the gaps between the various parts inside the tube and between the tube walls (including the extension of the wall thickness of the aluminum tube itself) during the rolling process after the tube is inserted. Under the premise of uniform extension, the electrode sheet, insulation film and PTC heating element inside the aluminum tube will be tightly combined with the heat-conducting 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 reliability of the product; (3) Under the premise of uniform shrinkage of the aluminum tube and tighter combination of the various parts inside the tube, it also has a significant improvement effect on improving the action noise of the product caused by sudden changes in temperature.

[0029] There are no reinforcing ribs, and there are only 3 or fewer rollers. The pressure can only be adjusted, but the distance between the two rollers cannot be adjusted. 2. Effects of the invention: (1) Rights 1 and 2-1, since the surface contact surface of the PTC heating plate and the electrode strip is not an absolute mirror surface, the corresponding tiny protruding points are in contact for conductivity, and the recessed points 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 recessed points store silicone tightly and evenly, which not only ensures reliable and uniform electrical contact points, evenly distributes the current, eliminates contact resistance, but also makes the silicone stored in the recessed points between the corresponding contact heat-conducting surfaces evenly distributed, ensuring the connection and contact strength. (2) Rights 3 and 4, reinforcing ribs: The thickness of the heating core after pressing can be accurately set, and on the basis of gradually thinning the thickness, the contact and fit between the heating element in the heat-conducting aluminum tube and the heat-conducting aluminum tube are made tighter. 2. By gradually and slightly reducing the thickness of the heating core, it is ensured that after pressing, the heating element in the tube will not crack or break, there will be no gaps between the sheets, and the heating element and the electrode sheet will be firmly bonded. Example: The first set of rollers is designed with a gap of 0.05mm, which has the effect of evenly and tightly fitting the high-viscosity silicone to the heating element and the electrode sheet. This ensures that as pressure increases, adjacent heating elements and the electrode sheet are reliably positioned with each other due to the adhesive effect of the silicone under uniform pressing, without displacement or gaps. The subsequent sets of rollers gradually increase pressure on this basis, making the contact surfaces of the various accessories in the tube fit more tightly. In particular, the brittleness of the ceramic heating element is significantly improved by slowly, evenly, and gradually increasing pressure on the linear shape and the entire surface in the heat conduction width direction. This eliminates the existing technology that inevitably causes cracks and breakage in the heating element during pressing, which can lead to major safety accidents such as short circuits and open circuits in the heating device, and the durability risks such as power attenuation and reduced service life due to debonding or uneven bonding between the heating element and the electrode sheet.

[0030] A PTC heating device includes a PTC heating core, a heat-conducting aluminum tube, and a radiator. The heat-conducting aluminum tube has a heat-conducting flat surface and a pressing surface. The wall thickness of the heat-conducting flat surface exceeds three times the wall thickness of the pressing surface. The radiator includes heat-dissipating fins. The preparation process of the heat-conducting aluminum tube is as follows:

[0031] 1) Melt and soften the aluminum ingot in a special melting furnace;

[0032] 2) The softened aluminum liquid with a certain strength at the furnace mouth is then stretched out of the furnace through a dedicated mold cavity, wherein the mold 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] Furthermore, the radiator is a heat dissipation tooth plate cut by scraping the thick wall of the heat-conducting plane of the heat-conducting aluminum tube, and the heating core is composed of a first electrode strip and a second electrode strip comprising a conductive surface and a heat-conducting surface, several PTC heating sheets clamped in parallel by the heat-conducting surfaces of the electrode strips, temperature-resistant insulating silicone and a temperature-resistant insulating film.

[0035] Furthermore, the wall thickness of the heat-conducting plane of the heat-conducting aluminum tube where the heat-dissipating fins are cut is 3 to 15 mm, the width of the heat-dissipating fins is 11.5 to 24.5 mm, and the height is 5 to 17 mm. The two sides of the heat-dissipating fins on the heat-conducting plane of the heat-conducting aluminum tube are positioning and pressing surfaces with a width less than the width of the heat-dissipating fins. The wall thickness of the positioning and pressing surfaces is 0.1 to 1.5 mm, and the width is 0.5 to 6 mm. The wall thickness of the two sides of the heat-conducting aluminum tube is 0.2 to 2.5 mm, and the thickness of the heat-dissipating fins is 0.02 to 2.5 mm.

[0036] The pressing can be done by applying pressure to the pressing surfaces on both sides and by using multiple sets of rollers to press the pressing surfaces on both sides.

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

[0038] Furthermore, the heat dissipation fins on the heat-conducting aluminum tube have at least one angled surface in the width direction, and the top angle of the angled surface is 5 to 40 degrees.

[0039] Furthermore, the heat dissipation fins have a roughly arcuate surface along the width direction of the heat dissipation surface, the chord width of the arcuate surface is 2 to 8 mm, and the bow height is 0.1 to 1.5 mm.

[0040] Effects of the invention: 1. Increase the heat dissipation area; 2. Reduce the cost of aluminum; 3. The shape of the heat sink can store and accommodate condensation droplets caused by the surface temperature difference of the heater after the power is turned off, thereby preventing these droplets from being blown into the room with the instantaneous heat exchange air volume when the power is turned on again, causing functional defects.

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

[0042] 1) Melt and soften the aluminum ingot in a special melting furnace;

[0043] 2) The softened aluminum liquid with a certain strength at the furnace mouth is then stretched out of the furnace through a dedicated mold cavity, wherein the mold 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 at room temperature 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 thermally conductive surface, several PTC heating sheets clamped in parallel by the thermally conductive surfaces of the electrode strips, a temperature-resistant insulating silicone located between the PTC heating sheet and the thermally conductive surfaces of the electrode strips, and a temperature-resistant insulating film covering the electrode strips clamping the PTC heating element. The surface of the thermally conductive aluminum tube is a thermally conductive plane and a pressing surface with approximately equal wall thickness. The radiator is inlaid or welded on the thermally conductive plane of the thermally conductive aluminum tube. After the heating core penetrates into the cavity of the thermally conductive aluminum tube including the radiator, the width gap between the heating core and the inner side wall of the thermally conductive aluminum tube cavity is basically eliminated at the same time by applying pressure to the pressing surface of the thermally conductive aluminum tube. The width of the pressing surface is 0.5 to 6 mm. The radiator is positioned on the thermally conductive plane of the thermally conductive aluminum tube to form the PTC heating device.

[0046] A PTC heating device comprises a PTC heating core, a heat-conducting aluminum tube and a radiator, wherein the heating core comprises a first electrode strip and a second electrode strip comprising conductive surfaces and heat-conducting surfaces, a plurality of PTC heating sheets clamped in parallel 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, wherein the portion of the heating core of the heating device located at the electrode lead-out end extends beyond the end corresponding to the heat-conducting aluminum tube, and the insulating film at the electrode lead-out end of the heating core and the periphery of the junction of the heat-conducting aluminum tube are coated with temperature-resistant insulating sealant.

[0047] Function: It can effectively prevent the condensation water droplets from penetrating into the gap between the heating core and the inside of the heat-conducting aluminum tube through the gap at the junction of the heat-conducting aluminum tube and the heating core when the heating device is used in a humid environment, causing the water droplets to invade between the electrode strips covered by the insulating film and the PTC heating sheet, thereby causing leakage and non-insulation of the heating device, and even causing short circuit, breakdown and other failures of electrical products such as air conditioners using PTC heating devices, as well as major safety accidents such as explosion, combustion, and leakage.

[0048] A PTC heating device comprises a PTC heating core, a heat-conducting aluminum tube and a radiator, wherein the heating core comprises a first electrode strip and a second electrode strip comprising a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets clamped in parallel by the heat-conducting surfaces of the electrode strips, a temperature-resistant insulating silicone 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 heat-conducting aluminum tube of the heating device having at least one columnar reinforcing rib on the side surface, the columnar reinforcing rib being approximately centered on the side surface of the heat-conducting aluminum tube heating element and being the same length as the heat-conducting aluminum tube, the cross-section of the columnar reinforcing rib being roughly arc-shaped with a chord width of 0.3 to 2 mm and a bow height of 0.2 to 2 mm.

[0049] A PTC heating device, characterized in that it includes a heat dissipation strip and a PTC heating sheet attached to the heat conductive sheet of the heat dissipation strip as a group, mixed silica gel is provided between the heat conductive surface of the heat dissipation strip and the heating surface of the heating sheet, the mixed silica gel is composed of at least two components, at least one of which is liquid at room temperature, the silica gel is configured in proportion and fully mixed to become synthetic silica gel with good fluidity, the synthetic silica gel is completely cured at a temperature of 150 to 300°C and for more than 5 minutes, combining the heat dissipation strip and the PTC heating sheet into the PTC heating device.

[0050] A PTC heating device assembly includes a PTC heater consisting of a PTC heating core, a heat-conducting aluminum tube and a radiator, 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 heating core has a first electrode strip and a second electrode strip comprising a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets clamped in parallel 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 having a base and a cover, the base along the heating surface The extended end of the device electrode strip has an open large cavity for accommodating the lead-out ends of the electrode strips of different polarities of the heating device and the electrical connection part introduced into the power harness and the power harness connection line. The open large cavity also has an open small cavity separated by a positioning insulating wall. The small cavity accommodates and positions the heat-conducting surface or temperature controller or temperature fuse at the end of the heating device respectively. The temperature-sensing surface of the temperature controller and the temperature fuse is attached to the side of the positioning insulating wall corresponding to the heat-conducting plane of the adjacent heating device. The angle between the cavity for positioning the temperature controller and the temperature fuse and the heat-conducting surface at the end of the heating device is 0 to 90°.

[0051] Furthermore, an open positioning cavity groove for accommodating a power lead wire from the temperature fuse is provided on a side adjacent to the positioning insulating wall of the open small cavity for positioning the temperature fuse.

[0052] Furthermore, the open small cavity accommodating the temperature fuse and the positioning insulating wall of the adjacent open positioning cavity groove accommodating the power lead of the temperature fuse have a notch connecting the two cavities. The lead of the temperature fuse is embedded in and positioned in the lead positioning cavity groove through the notch. The temperature controller, temperature fuse, introduced power wiring harness and various connection points positioned in the open large cavity of the bracket base are all sealed in the corresponding open large cavity through the sealing cover.

[0053] Description of invention points: 1. Temperature control and fuse cavity: (1) Applicable to surface-charged assemblies and surface-insulated assemblies. (2) For surface-charged heating devices, since the surface of the radiator is charged and the surface of the round tube fuse is charged, the existing technology adopts radiation temperature sensing. That is, the temperature control and fuse are installed in a space with a certain electrical gap and safety distance between the heating device and the heating device, and it is necessary to install accessories such as sheet metal, which is costly and has low assembly efficiency. In addition, since thermal radiation temperature sensing is adopted, it also brings functional defects such as 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 and fast action when the temperature is abnormal, which effectively improves reliability. (3) With the present invention, the existing temperature control and fuse protection temperature sensing method can be changed to conductive temperature sensing with the temperature sensing surface close to the heating surface of the heating device. Regardless of whether the heating device is charged or not, the temperature 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 for fuse leads: (1) Deficiencies of existing technologies: Since the input and output power leads of a common cylindrical fuse are located at the two ends, one of the leads and the metal shell of the fuse have the same polarity, which can easily lead to the fuse short-circuiting and not working when the two leads are short-circuited. (2) Existing technologies position the fuse and its power input and output ends in the same cavity. The two different power leads are 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 at its root by more than 180 degrees and then be led out closely to its shell. A slight external force can easily cause the root to break or fall off, and also cause 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° in the cavity of the positioning fuse, away from the root, so that the power lead is led out of the cavity. No matter how large the external force is, the force point can only be applied at the end wall of the notch through the fuse lead, and there is no risk of displacement of the fuse. (2) The working reliability of the fuse is greatly improved. (3) The two power leads of different polarity are located in two different cavities, which completely avoids the risk of short circuit between the leads, and the safety of use is also reliably improved, guaranteed and enhanced.

[0054] A PTC heating device assembly comprises a PTC heater consisting 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 harness connected to a temperature controller and a temperature fuse, wherein the heating core comprises a first electrode strip and a second electrode strip comprising a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets clamped in parallel 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 first mounting bracket comprising a base body and a cover, the base body comprising a first cavity and a sleeve along the extending end of the electrode strips of the heating device for accommodating the lead-out ends of the electrode strips of different polarities of the heating device and the electrical connection portion of the incoming power supply harness and the connection line of the power supply harness, a second cavity for accommodating the end of the radiator of the heating device, a small pit for accommodating and positioning the temperature controller and the temperature fuse at the wall thickness of the second cavity which is in contact with the heat dissipation surface of the end of the radiator, the depth of the small pit being much smaller than the length of the temperature controller and the temperature fuse.

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

[0056] Furthermore, a positioning cavity groove for accommodating the power lead of the fuse is provided on a side adjacent to the positioning wall of the small pit body of the positioning temperature fuse.

[0057] Furthermore, there is a notch connecting the small pit body accommodating the temperature fuse and the positioning cavity groove of the adjacent temperature fuse power lead on the partition wall, and the lead of the temperature fuse is embedded in and positioned in the positioning cavity groove of the power lead through the notch.

[0058] Existing technology: Guowei CN201515508U. Disadvantages: 1. The temperature controller, temperature fuse and power harness connection points are in the same plane of the cavity. The installation position and space are small, and power contacts and wires of different polarities inevitably interfere with each other, which poses a great risk to reliability and safety. (2) The temperature difference between the ventilation state and the dry-burning state is not obvious, which can easily lead to malfunction. Inventive point: The thermostat and fuse are positioned in the corresponding cavity on the other plane of the power lead-out terminal and the electrical connection pressure point of the heating device. The power lead-out terminal of the heater and the power supply and the connection points of the thermostat and fuse are all located in the plane of the large cavity. The space of the cavity is large, and the power contacts and wires of different polarities can be conveniently isolated and do not interfere with each other. The structural optimization brings about improvements and enhancements in safety and reliability. Example: See the structural diagram of the AUX Gree component. 2. Gree CN102271429A. The defects of the existing technical features: (1) The temperature control and fuse are both located on the surface of the bracket body and a considerable part of them are exposed. When used in a humid or corrosive environment, the control device is easily contaminated and corroded, resulting in failure. (2) The power contacts and power leads of the live parts are all located on the outer surface of the bracket body. In a humid or corrosive environment, they are easily aged and the insulation is reduced, resulting in safety accidents. Effects 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 an abnormal working state of no wind and dry burning, the temperature difference between the temperature controller and the temperature fuse located on the bracket surface and the working state of ventilation and heating is more obvious. In the state of dry burning without ventilation, the protection can be effectively disconnected instantly. (2) Because the temperature controller and the temperature fuse are directly subjected to the better heat dissipation of the circulating natural wind in the ventilation working state, the malfunction caused by the poor heat dissipation effect of the temperature controller and the temperature fuse in the ventilation working state is reliably avoided. (3) The temperature controller and temperature fuse are sealed inside the mounting bracket and fit onto the radiator surface of the PTC heating element, without occupying the volume of the cavity where the electrode lead-out terminal and power connection point are located within the mounting bracket. This allows for greater installation space and separation between the power lines of different polarities and the connection points of the temperature controller and fuse, effectively ensuring sufficient creepage distance and electrical clearance. (4) During assembly, the positioning and operating space of the power harness is significantly increased, greatly improving assembly efficiency and significantly reducing manufacturing costs.

[0059] A PTC heating device assembly comprises a PTC heater consisting of a PTC heating core, a heat-conducting aluminum tube and a radiator, a first mounting bracket, a second mounting bracket and an introduction power supply wiring harness connected to a temperature controller and a temperature fuse, wherein the heating core comprises a first electrode strip and a second electrode strip comprising a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets clamped in parallel 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 first mounting bracket comprising a base body and a cover, the base body having an open large cavity along the extending end of the electrode strips of the heating device for accommodating the lead-out ends of the electrode strips of different polarities of the heating device, the electrical connection portion of the introduction power supply wiring harness and the connection line of the power supply wiring harness, the open large cavity having a cavity for accommodating a temperature controller or a temperature fuse along one side of the thickness of the side of the heating device.

[0060] Furthermore, 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] Furthermore, 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] Furthermore, the temperature controller or temperature fuse is inserted into the cavity from the opening of the corresponding small cavity and its introduced power wiring harness is positioned and accommodated in the open large cavity of the base body. After the base body and the cover close the open large cavity, the open part of the small cavity and the electrically connected part of the power wiring harness and all leads of different polarities are reliably sealed in the open large cavity of the bracket.

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

[0064] Furthermore, there are no less than two groups of heating devices, and the cavity is located between and fits in the heat-conducting planes of two adjacent groups of heating devices.

[0065] Disadvantages of existing technologies: 1. Xinye CN00221004: (1) Although it is set to be installed on the side wall, front wall or top wall of the bracket and to be inserted in multiple ways such as forward, backward, left or right, the premise is that the temperature control sensing surface must be close to the heat dissipation strip with electricity on the surface, which is prone to safety accidents such as short circuit and leakage. It is unreliable and difficult to operate and install. (2) The two sockets of the temperature control and fuse are respectively deep into the inner wall of the cavity of the bracket, so that the power lead and the electrical connection point can only be exposed outside the bracket. (3) The cover plate is only used to support the positioning function of the temperature controller and cannot solve the problem of the exposed connection point of the live part, which brings great hidden dangers to the safety and reliability of use. 2. Xu Chengdong CN201420064071: The cover plate is exposed in the space on the surface of the bracket, which easily causes water droplets to penetrate into the cavity of the positioning temperature control and fuse, bringing safety hazards. 3. Guowei 200920235929: (1) The temperature controller is located in the cavity of the bracket body. The temperature change of the temperature sensing surface of the thermostat in the ventilation working state and the dry-burning state when the heating device is abnormal is 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 controller cavity is placed in the bracket body, which occupies a large space and can easily cause interference between the power lines and connection points of different polarities in the body cavity, resulting in major safety accidents such as short circuits or creepage. Creativity: (1) The small cavity extends in the opposite direction of the head of the heating device to introduce power, without occupying the body cavity volume, so that there is enough space between the power lines and connection points of different polarities of the temperature controller and fuse to be separated and sufficient creepage distance and electrical clearance are guaranteed. 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 element. The temperature sensing surface is attached to the insulating isolation wall adjacent to the heating surface of the heating element, eliminating the safety hazards of leakage, creepage, and malfunction. (3) The small cavity, the incoming power line, and all live connection points are placed in the large cavity of the base body, without interference of different polarities. Water droplets cannot penetrate into the cavity containing the temperature controller and the temperature fuse, greatly improving the reliability and safety of use. (4) In the ventilation working state, the cavity containing the thermostat / fuse has the same heat exchange conditions as the heating element, and the temperature is much lower than the temperature in the dry-burning without ventilation state. This ensures that the temperature control protection temperature point is reached quickly in the abnormal state of dry-burning without air, playing a sensitive protection role and ensuring that no malfunction occurs in the working state due to the large temperature difference between the dry-burning without air and the ventilation working state. The reliability of the product is ensured. Example: Delong portable air conditioner double-row assembly diagram. The embodiment describes that the cavity can be close to the longitudinal surface of the thickness side of the heating element of the device or the heat dissipation corrugated surface in the width direction. Among them, the structure close to the heat dissipation corrugated heat dissipation surface can adopt the temperature control and fusing on the same heat dissipation surface, with the windward side being the best solution.One of the optimized ones is the Delong double-row heating element. Since the heating element has a better heat dissipation effect under ventilation and heating conditions, it can completely avoid malfunction of the thermostat or fuse under working conditions, thereby improving the reliability of the product function.

[0066] A PTC heating device assembly comprises a PTC heater consisting 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 wiring harness connected to a temperature controller and a temperature fuse, wherein the heating core comprises a first electrode strip and a second electrode strip comprising a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets clamped in parallel 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 first mounting bracket comprising a base body and a cover, a large open cavity being defined within the base body, and after the electrical connection parts of different polarities are positioned within the large open cavity, the electrode strips leading out of the heating device and the electrical connection parts of the power supply wiring harness connected thereto and the corresponding gaps are all filled and sealed with insulating sealant.

[0067] Furthermore, a limiting insulating wall is provided along the outer side of the extended end of the lead-out end of the electrode strips of different polarities of the heating device in the open large cavity, and the lead-out electrode strips of the heating device filled and sealed with insulating sealant, the electrical connection part of the power harness connected thereto, and the corresponding insulating sealant are all positioned in the open small cavity surrounded by the limiting insulating wall.

[0068] Furthermore, the lead ends of the electrode strips of different polarities and the corresponding electrical connection parts positioned in the open large cavity are covered with insulating heat shrink tubing, and the electrode strip lead ends, the electrical connection parts connected thereto and the corresponding gaps are all filled and sealed with insulating sealant.

[0069] Prior art: CN104797022A, a thermistor ceramic heater assembly, heater, and mounting bracket. The terminals of the electrodes of different polarities lack sealant, the outer side of the terminals lacks a positioning insulating wall, and the terminal surface lacks insulating heat shrink tubing. In damp or submerged conditions, the PTC heating element may immediately fail, short-circuit, and explode. Short-circuiting and leakage in the electrical connections can also cause serious safety hazards.

[0070] Key points of the invention: (1) The insulating sealant completely covers and fills the gaps between the electrode lead-out terminals of different polarities and the power supply pressure points, ensuring that the PTC heating element will not leak water in a humid or submerged state, and the electrical connection part can also ensure reliable insulation. (2) The positioning insulating wall on the outside of the electrode lead-out terminal not only serves to limit the lead-out electrode, but also forms a cavity between the electrode lead-out terminals of different polarities and the connection points with the input power supply, so that the sealant is not wasted. (3) The sealant with good fluidity can be stored in the cavity surrounded by the insulating wall, covering and filling the gaps between the electrode lead-out terminals of different polarities and the power supply pressure points. (4) The electrode lead-out terminals of different polarities and the power supply pressure points are all wrapped in the heat shrink tubing, which can further reduce the waste of sealant and improve the reliability of the seal and production efficiency. Effects of the invention: (1) The sealing and insulation performance are greatly improved, ensuring the reliable sealing and insulation of the live parts. (2) The overflow and waste of sealant are avoided, ensuring the sealing and insulation effect. (3) The operability and process consistency of mass production are improved, greatly improving the production efficiency. (Example description: Even when the electrical connection part and the power cord lead end are completely immersed in water, the live part of the heating device and its surface can still be reliably insulated and no leakage occurs.) (4) The problem of water seepage and leakage of PTC heaters in humid environments is completely solved, fundamentally solving the waterproof performance and safety and reliability of use. Example: Structural diagram of the Gree small pit assembly.

[0071] A PTC heating device assembly, including a PTC heating device assembly, wherein the open large cavity of the first bracket has a positioning slot for positioning the power supply lines of different polarities connected to the temperature controller and the temperature fuse and the input power supply, and one side of the positioning slot has an isolation wall for accommodating and fixing the power supply line.

[0072] Effects of the invention: 1. Separates and positions power leads of different polarities. 2. Ensures that the power leads connected to the temperature controller and temperature fuse are positioned within the slots. When subjected to external forces, displacement of the temperature controller and temperature fuse will not cause malfunction or failure of the protective function due to inaccurate temperature sensing.

[0073] A PTC heating device assembly includes a PTC heating device, a first mounting bracket, a second mounting bracket, and an incoming power supply wiring harness connected to a temperature controller and a temperature fuse, wherein the first mounting bracket has a base and a cover, the rear end face of the base 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 rear end face of the base, and the extension has a second through hole corresponding to the first through hole on the rear end face of the base.

[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] Furthermore, chamfers or grooves are provided on the four sides of the cavity side wall where the second mounting bracket is joined to the sleeved heating device.

[0092] Furthermore, 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 to completely fill the gap between the surrounding wall openings of the bracket side wall and the junction of the heating element.

[0093] Effects of the invention: This technology compensates for the gap between the heating element and the heat sink at the tail end, which can be caused by tooling and human negligence during the device molding and curing process. This prevents debonding and debonding between the heating element and the heat sink, ensuring the heater's bonding strength, heat dissipation efficiency, safety, and reliability. This improves the safety and reliability of heating devices.

[0094] Furthermore, the assembly comprises a first mounting bracket, a second mounting bracket, and a power harness connected to a temperature controller and a temperature fuse; the first mounting bracket comprises a base and a cover; and the base 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 around the wall openings.

[0095] Furthermore, the chamfer or groove is recessed toward the side contacting the heating element, and sealant 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.

[0096] Existing technology: Gree CN201010245871: (1) All power contacts are exposed on the surface of the bracket, which cannot solve the sealing and leakage problems when used in 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, which cannot guarantee the sealing performance and avoid the water seepage and leakage problems when used in humid environments, and is unsafe to use. Creativity of rights 27-29: (1) The joint gap between the bracket base and the heating element has a double and reinforced seal with sealant, (2) The chamfers or grooves on the joint surface can effectively store sealant with good fluidity, completely eliminate water seepage, and improve and enhance the waterproof performance. (3) The sealant stored in the chamfer increases the bonding area, improves the bonding strength, extends the service life, and eliminates leakage and short circuits caused by moisture and condensed water droplets.

[0097] Furthermore, the assembly comprises first and second mounting brackets and a power harness connected to a temperature controller and a temperature fuse; the first mounting bracket comprises a base and a cover; and all joints between the base and the cover are chamfered or grooved.

[0098] Furthermore, 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.

[0099] Furthermore, after the base of the first mounting bracket is covered with a cover, a temperature-resistant, insulating heat shrink tubing is put on. At a temperature of 70 to 120 degrees, the heat shrink tubing shrinks, fixing and sealing the bracket into a closed whole with no surface clearance.

[0100] Furthermore, the PTC heating devices are combined in parallel in multiple groups.

[0101] An electrical appliance comprises a PTC heating element and an assembly.

[0102] Furthermore, the electrical appliance is at least one selected from an air conditioner, a heater, a hot air curtain, a bathroom heater, a dehumidifier, an air purifier, a clothes dryer, a new energy vehicle heater or a defroster.

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

[0104] 1. Existing technology: There is conductive glue between the heating plate and the electrode plate. Since the conductive glue contains a large amount of metal conductive powder, the bonding strength of the glue is greatly reduced. 2. Silica gel that solidifies quickly and naturally at room temperature is used. The production and storage costs are also high, and it is not convenient to use. 3. The existing heating core is formed with grooves on the side after rolling, which has a positive effect on improving the contact between the heating element and the electrode plate and the heating surface of the aluminum tube, and improving thermal efficiency. The present invention can greatly improve and enhance the bending caused by the stress released due to the change in thickness of the heating core after rolling, and ensure that the product is straight and non-deformed after rolling. For units with a length of 500 to 1000 mm or more (wall-mounted units and cabinet units between 1.5 and 5 HP), the side reinforcement ribs can greatly improve the bending and folding strength, and effectively eliminate and reduce deformation caused by external forces during turnover, transportation, and installation. In addition, the side reinforcement ribs can greatly improve and enhance the coating strength between the heat-conducting aluminum tube and the heating element, conductive electrode sheet and insulation layer coated therein, and effectively eliminate the loosening of the heat-conducting aluminum tube caused by the release of thermal stress caused by instantaneous hot and cold changes during the frequent startup, heating and shutdown cooling process of the heating element in the tube, resulting in gaps between the heating element and the conductive electrode and insulation layer in the tube, and the common contact gaps due to sparkover and carbonization between the heating element and the electrode sheet, and even local high temperature caused by long-term sparkover causing the melting of the insulation layer, resulting in surface charging and leakage, short circuit and breakdown, explosion, burning of flammable plastic indoor units and other major and serious safety accidents. (1) Since the size of the indentation of the aluminum tube into the inner cavity of the aluminum tube during the rolling process after the tube is inserted is smaller than that without the reinforcement ribs, the safety hazard of the insulation film being damaged by the side tube wall during the pressing process can be reduced; (2) The side reinforcement ribs are more conducive to eliminating the irregular extension of the aluminum tube along the length and width directions in the process of eliminating the gaps between the various parts inside the tube and between the tube walls (including the extension of the wall thickness of the aluminum tube itself) during the rolling process after the tube is inserted. Under the premise of uniform extension, the electrode sheet, insulation film and PTC heating element inside the aluminum tube will be tightly combined with the heat-conducting 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 reliability of the product; (3) Under the premise of uniform shrinkage of the aluminum tube and tighter combination of the various parts inside the tube, it also has a significant improvement effect on improving the action noise of the product caused by sudden changes in temperature.

[0105] There are no reinforcing ribs, and there are only 3 or fewer rollers. The pressure can only be adjusted, but the distance between the two rollers cannot be adjusted. 2. Effects of the invention: (1) Rights 1 and 2-1, since the surface contact surface of the PTC heating plate and the electrode strip is not an absolute mirror surface, the corresponding tiny protruding points are in contact for conductivity, and the recessed points 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 recessed points store silicone tightly and evenly, which not only ensures reliable and uniform electrical contact points, evenly distributes the current, eliminates contact resistance, but also makes the silicone stored in the recessed points between the corresponding contact heat-conducting surfaces evenly distributed, ensuring the connection and contact strength. (2) Rights 3 and 4, reinforcing ribs: The thickness of the heating core after pressing can be accurately set, and on the basis of gradually thinning the thickness, the contact and fit between the heating element in the heat-conducting aluminum tube and the heat-conducting aluminum tube are made tighter. 2. By gradually and slightly reducing the thickness of the heating core, it is ensured that after pressing, the heating element in the tube will not crack or break, there will be no gaps between the sheets, and the heating element and the electrode sheet will be firmly bonded. Example: The first set of rollers is designed with a gap of 0.05mm, which has the effect of evenly and tightly fitting the high-viscosity silicone to the heating element and the electrode sheet. This ensures that as pressure increases, adjacent heating elements and the electrode sheet are reliably positioned with each other due to the adhesive effect of the silicone under uniform pressing, without displacement or gaps. The subsequent sets of rollers gradually increase pressure on this basis, making the contact surfaces of the various accessories in the tube fit more tightly. In particular, the brittleness of the ceramic heating element is significantly improved by slowly, evenly, and gradually increasing pressure on the linear shape and the entire surface in the heat conduction width direction. This eliminates the existing technology that inevitably causes cracks and breakage in the heating element during pressing, which can lead to major safety accidents such as short circuits and open circuits in the heating device, and the durability risks such as power attenuation and reduced service life due to debonding or uneven bonding between the heating element and the electrode sheet.

[0106] 2. Use skived-tooth heat sinks to 1. Increase the heat dissipation area; 2. Reduce the cost of aluminum; 3. The shape of the heat sink can store and accommodate condensation droplets caused by the surface temperature difference of the heater after the power is turned off, thereby preventing these droplets from being blown into the room with the instantaneous heat exchange air volume when the power is turned on again, causing functional defects.

[0107] 3. The design of coating the insulating film of the leading end of the heating core electrode and the periphery of the joint of the thermally conductive aluminum tube with a temperature-resistant insulating sealant can effectively prevent condensation water droplets from penetrating into the gap between the heating core and the inside of the thermally conductive aluminum tube through the gap at the joint of the thermally conductive aluminum tube and the heating core when the heating device is used in a humid environment, causing water droplets to invade between the electrode strips covered by the insulating film and the PTC heating sheet, thereby causing leakage and non-insulation of the heating device, and even causing short circuit, breakdown and other failures in electrical products such as air conditioners using PTC heating devices, as well as major safety accidents such as explosion, combustion, and leakage.

[0108] 4. Temperature control and fuse cavity: (1) Applicable to surface-charged assemblies and surface-insulated assemblies. (2) For surface-charged heating devices, since the surface of the radiator is charged and the surface of the tubular fuse is charged, the existing technologies all adopt radiation temperature sensing. That is, the temperature control and fuse are installed in a space with a certain electrical gap and safety distance between the heating device and the heating device, and it is necessary to install accessories such as sheet metal, which is costly and has low assembly efficiency. In addition, since thermal radiation temperature sensing is adopted, it also brings functional defects such as 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 and fast action when the temperature is abnormal, which effectively improves reliability. (3) By adopting the present invention, the temperature sensing method of the existing temperature control and fuse protection can be changed to conductive temperature sensing with the temperature sensing surface close to the heating surface of the heating device. Regardless of whether the heating device is charged or not, the temperature 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. Positioning cavity for fuse leads: (1) Deficiencies of existing technologies: Since the input and output power leads of a common cylindrical fuse are located at the two ends, one of the leads and the metal shell of the fuse have the same polarity, which can easily lead to the fuse short-circuiting and not working when the two leads are short-circuited. (2) Existing technologies position the fuse and its power input and output ends in the same cavity. The two different power leads are 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 at its root by more than 180 degrees and then be led out closely to its shell. A slight external force can easily cause the root to break or fall off, and also cause 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° in the cavity of the positioning fuse, away from the root, so that the power lead is led out of the cavity. No matter how large the external force is, the force point can only be applied at the end wall of the notch through the fuse lead, and there is no risk of displacement of the fuse. (2) The working reliability of the fuse is greatly improved. (3) The two power leads of different polarity are located in two different cavities, which completely avoids the risk of short circuit between the leads, and the safety of use 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, that is, ensures the reliable sealing and insulation of the live parts, and also avoids the overflow and waste of sealant. (2) Improves the operability and process consistency of mass production, and greatly improves production efficiency. (3) In an environment where the electrical connection parts and the power cord lead-out ends are all immersed in water, it can still ensure that the live parts and their surfaces of the heating device do not leak electricity. (4) Completely solves the water seepage and leakage problems of the heater when used in a humid environment, and fundamentally solves the waterproof performance and safety and reliability of use. Example: Structural diagram of the Midea bracket.

[0112] 8. (1) The wiring harness is tightly compressed and sealed by the sealing ring, and the sealant at the joint of the sealant 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 structurally speaking, the hidden dangers of leakage and short circuit in moist 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.

[0113] 9. (1) The condensation water generated by the sudden change of ambient temperature during the operation of the heater cannot penetrate into the interior of the tail aluminum tube heating element, causing water droplets to accumulate between the internal electrode sheets or on the side of the heating element, resulting in a short circuit. (2) The gap between the tail 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.

[0114] 10. Compensate for the gap between the tail heating element and the radiator caused by tooling and human negligence during the device molding and curing process, and prevent the debonding and degumming between the heating element and the radiator. This ensures the bonding strength of the heater, the heat dissipation effect, safety and reliability, and improves the safety and reliability of the heating device.

[0115] 11. (1) The gap between the bracket body and the heating element is double-sealed and reinforced with sealant. (2) The chamfers or grooves on the joint surface can effectively store the sealant with good fluidity, completely eliminating water seepage and improving and enhancing the waterproof performance. (3) The sealant stored in the chamfer increases the joint area, improves the joint strength, extends the service life, and eliminates leakage and short circuit caused by moisture and condensation droplets. BRIEF DESCRIPTION OF THE DRAWINGS

[0116] Figure 1 This is a schematic structural diagram of a heat-conducting aluminum tube using columnar reinforcement ribs according to the present invention;

[0117] Figure 2This is a schematic diagram of the structure of the flat-sheet-free corrugated heat dissipation strip welded on the heat-conducting aluminum tube of the present invention;

[0118] Figure 3 This is a schematic diagram of the cross-sectional structure of the heating core of the present invention;

[0119] Figure 4 This is a schematic structural diagram of the angled skived-tooth heating device of the present invention;

[0120] Figure 5 This is a schematic diagram of the structure of a heating device with a folded corner cut along the width direction of the present invention;

[0121] Figure 6 This is a schematic diagram of the structure of a heating device with an arcuate surface cut along the width direction of the present invention;

[0122] Figure 7 This is a structural diagram of Example 7 of the present invention;

[0123] Figure 8 This is a schematic structural diagram of Example 8 of the present invention;

[0124] Figure 9 A schematic diagram of an existing TCL assembly;

[0125] Figure 10 This is a schematic diagram of a heating device of a radiator using a heat-conducting flat sheet wrapped with a corrugated heat-dissipating strip according to the present invention;

[0126] Figure 11 Schematic diagram of the structure of Example 10 and Example 11 of the present invention;

[0127] Figure 12 This is a structural schematic diagram of a semicircular hole corresponding to the first mounting bracket on the cover plate of the present invention;

[0128] Figure 13 This is a cross-sectional view of the chamfering and gluing of the joint between the cover plate and the first mounting bracket of the present invention;

[0129] Figure 14 This is a cross-sectional view of the first mounting bracket of the cover plate pressing the sealant according to the present invention;

[0130] Figure 15 Schematic diagram of covering the first mounting bracket of the present invention with a cover plate and putting on a heat shrink tube;

[0131] Figure 16 This is a schematic structural diagram of the first mounting bracket of the present invention using a small pit body;

[0132] Figure 17 This is a schematic diagram of the structure of the first mounting bracket of the present invention using a cavity;

[0133] Figure 18 It is a schematic structural diagram of the power wiring harness of the present invention;

[0134] Figure 19 This is a schematic diagram of the structure of the heating device of the present invention connected to the power wiring harness;

[0135] Figure 20 is a structural schematic diagram of a second mounting bracket of the present invention;

[0136] Figure 21 It is a schematic diagram of the plug spring of the present invention. DETAILED DESCRIPTION

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

[0138] Example 1

[0139] A PTC heating device includes a PTC heating core, a thin-walled, elongated, hollow, heat-conducting aluminum tube 1, and a radiator. The heating core includes a first electrode strip and a second electrode strip having conductive and heat-conducting surfaces, a plurality of PTC heating sheets 3 sandwiched in parallel 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 sandwiching the PTC heating element. The heat-resistant insulating silica gel 4 has at least two components, at least one of which 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) Melt and soften the aluminum ingot in a special melting furnace;

[0141] 2) The softened aluminum liquid with a certain strength at the furnace mouth is then stretched out of the furnace through a dedicated mold cavity, wherein the mold 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 to form a flat and long hollow heat-conducting aluminum tube.

[0143] The radiator 6 is a corrugated heat dissipation strip, and the heating core is inserted into the oblong cavity of the heat-conducting aluminum tube 1 to form an aluminum tube heating element. By gradually rolling the heat-conducting surface of the heating element, all gaps between the PTC heating sheet 3, the electrode strip 2 and the temperature-resistant insulating film 5 in the heating core that penetrates the cavity of the heat-conducting aluminum tube 1, and between the heating core and the heat-conducting surface of the inner wall of the heat-conducting aluminum tube 1 are eliminated and tightly adhered to each other to form a PTC heating element. The heat-conducting surface of the PTC heating element is adhered to the heat-conducting surface corresponding to the heat dissipation strip, and synthetic silicone is applied at the adhesion point. The synthetic silicone is completely cured at a temperature of 150 to 300°C for more than 5 minutes, and the heat-conducting aluminum tube 1 heating element and the heat dissipation strip are firmly bonded together.

[0144] The heat-conducting aluminum tube 1 heating element is rolled and pressed on the entire heat-conducting surface of the heating element by multiple sets of rollers. The distance between the rolling surfaces of each set of rollers can be fine-tuned. After each set of rollers rolls in turn, the thickness of the heating element is gradually reduced by 0.01 to 0.25 mm 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 flat surface 8 and a pressing surface 9. The wall thickness of the heat-conducting flat surface 8 exceeds three times the wall thickness 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) Melt and soften the aluminum ingot in a special melting furnace;

[0148] 2) The softened aluminum liquid with a certain strength at the furnace mouth is then stretched out of the furnace through a dedicated mold cavity, wherein the mold 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 a heat dissipation tooth plate 10 cut by scraping 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 clamped in parallel by the heat-conducting surfaces of the electrode strips 2, a temperature-resistant insulating silicone rubber 4 and a temperature-resistant insulating film 5.

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

[0152] The heating core consists of a first electrode strip and a second electrode strip including conductive surfaces and thermal conductive surfaces, several PTC heating sheets 3 clamped in parallel by the thermal conductive surfaces of the electrode strips 2, a temperature-resistant insulating silicone 4 located between the PTC heating sheets 3 and the thermal conductive surfaces of the electrode strips 2, and a temperature-resistant insulating film 5 covering the electrode strips clamping the PTC heating element. After the heating core penetrates into the cavity of the heat-conducting aluminum tube 1 including the heat dissipation tooth plate 10, the pressing surface of the heat-conducting aluminum tube 1 is pressurized so that 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 the PTC heating device is combined. The heating device is located at the end of the heat-conducting aluminum tube 1 at the power input end, which extends 5 mm beyond the end of the heat dissipation tooth plate 10 corresponding to this end.

[0153] The heat dissipation fins 10 on the heat-conducting aluminum tube 1 have at least one angled surface 11 in the width direction, and the top angle of the angled surface is 5 to 40 degrees.

[0154] Example 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 flat surface 8 and a pressing surface 9. The wall thickness of the heat-conducting flat surface 8 exceeds three 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) Melt and soften the aluminum ingot in a special melting furnace;

[0157] 2) The softened aluminum liquid with a certain strength at the furnace mouth is then stretched out of the furnace through a dedicated mold cavity, wherein the mold 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 at room temperature to form a flat and long hollow heat-conducting aluminum tube.

[0159] The radiator 6 is a heat dissipation tooth plate 10 cut by scraping 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 clamped in parallel by the heat-conducting surfaces of the electrode strips 2, a temperature-resistant insulating silicone rubber 4 and a temperature-resistant insulating film 5.

[0160] The wall thickness of the heat-conducting plane 8 of the heat-conducting aluminum tube 1 where the heat-dissipating fins 10 are cut is 15 mm. The width of the heat-dissipating fins 10 is 24.5 mm and the height is 17 mm. The two sides of the heat-dissipating fins 10 on the heat-conducting plane 8 of the heat-conducting aluminum tube 1 are positioning and pressing surfaces 9 whose width is less than the width of the heat-dissipating fins. The wall thickness of the positioning and pressing surfaces 9 is 1.5 mm and the width is 6 mm. The wall thickness of the two sides 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 consists of a first electrode strip and a second electrode strip including conductive surfaces and thermal conductive surfaces, several PTC heating sheets 3 clamped in parallel by the thermal conductive surfaces of the electrode strips 2, a temperature-resistant insulating silicone 4 located between the PTC heating sheets 3 and the thermal conductive surfaces of the electrode strips 2, and a temperature-resistant insulating film 5 covering the electrode strips 2 that clamp the PTC heating element. After the heating core penetrates into the cavity of the thermally conductive aluminum tube 1 including the heat dissipation fins 10, the pressing surface 9 of the thermally conductive aluminum tube 1 is pressurized so that the width gap between the heating core and the inner side wall of the cavity of the thermally conductive aluminum tube 1 is basically eliminated, and then the PTC heating device is combined. The heating device is located at the end of the thermally conductive aluminum tube 1 at the power input end, which extends 50 mm beyond the end of the heat dissipation fin 10 corresponding to this end.

[0162] The heat dissipation fins 10 have a substantially arcuate surface 12 along the width direction of the heat dissipation surface. The chord width of the arcuate surface 12 is 2 to 8 mm, and the arch height is 0.1 to 1.5 mm.

[0163] Example 4

[0164] A PTC heating device includes a heating core, a thin-walled, elongated, 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) Melt and soften the aluminum ingot in a special melting furnace;

[0166] 2) The softened aluminum liquid with a certain strength at the furnace mouth is then stretched out of the furnace through a dedicated mold cavity, wherein the mold 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 at room temperature 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 including a conductive surface and a thermal conductive surface, several PTC heating sheets 3 clamped in parallel by the thermal conductive surfaces of the electrode strips 2, a temperature-resistant insulating silicone 4 located between the PTC heating sheet 3 and the thermal conductive surfaces of the electrode strips, and a temperature-resistant insulating film 5 covering the electrode strips 2 clamping the PTC heating element. The surface of the thermally conductive aluminum tube 1 is a thermally conductive plane 8 and a pressing surface 9 with approximately equal wall thickness. The radiator 6 is inlaid or welded on the thermally conductive plane 8 of the thermally conductive aluminum tube 1. After the heating core penetrates into the cavity of the thermally conductive aluminum tube 1 including the radiator 6, the width gap between the heating core and the inner wall of the cavity of the thermally conductive aluminum tube 1 is basically eliminated at the same time by applying pressure to the pressing surface 9 of the thermally conductive aluminum tube 1. The width of the pressing surface is 0.5 to 6 mm. The radiator 6 is positioned on the thermally conductive plane 8 of the thermally conductive aluminum tube 1 to form the PTC heating device.

[0169] Example 5

[0170] A PTC heating device comprises a PTC heating core, a heat-conducting aluminum tube 1 and a radiator 6, wherein the heating core comprises a first electrode strip and a second electrode strip comprising a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets 3 clamped in parallel by the heat-conducting surfaces of the electrode strips 2, a temperature-resistant insulating silica gel 4 located between the PTC heating sheets 3 and the heat-conducting surfaces of the electrode strips 2, and a temperature-resistant insulating film 5 covering the electrode strips 2 clamping the PTC heating element. The portion of the heating core of the heating device located at the electrode lead-out end 13 extends beyond the end corresponding to the heat-conducting aluminum tube 1, and the insulating film 5 at the electrode lead-out end 13 of the heating core and the periphery of the junction of the heat-conducting aluminum tube are coated with a temperature-resistant insulating sealant 14.

[0171] Example 6

[0172] like Figure 1 As shown, a PTC heating device includes a PTC heating core, a heat-conducting aluminum tube and a radiator, the heating core includes 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 clamped in parallel by the heat-conducting surfaces of the electrode strips 2, a temperature-resistant insulating silicone 4 located between the PTC heating sheets 3 and the heat-conducting surfaces of the electrode strips 2, and a temperature-resistant insulating film 5 covering the electrode strips 2 clamping the PTC heating element, the side of the heat-conducting aluminum tube 1 of the heating device has at least one columnar reinforcing rib 15, the columnar reinforcing rib 15 is roughly centered on the side of the heat-conducting aluminum tube 1 heating element and is the same length as the heat-conducting aluminum tube 1, and the cross-section of the columnar reinforcing rib 15 is roughly arc-shaped with a chord width of 0.3-2 mm and a bow height of 0.2-2 mm.

[0173] Example 7

[0174] A PTC heating device comprises a heat sink and a PTC heating sheet attached to the heat conducting sheet of the heat sink. Mixed silica gel is provided between the heat conducting surface of the heat conducting sheet of the heat sink and the heating surface of the heating sheet. The mixed silica gel is composed of at least two components, at least one of which is liquid at room temperature. The silica gel is configured in proportion and fully mixed to become synthetic silica gel with good fluidity. At a temperature of 150-300°C and for more than 5 minutes, the synthetic silica gel is completely cured, thereby combining the heat sink and the PTC heating sheet into the PTC heating device.

[0175] Example 8

[0176] A PTC heating device assembly, including a PTC heater consisting of a PTC heating core, a heat-conducting aluminum tube 1, and a radiator, and a first mounting bracket, a second mounting bracket 16, and a power supply wiring harness connected to a temperature controller 17 and a temperature fuse 18. The heating core has a first electrode strip and a second electrode strip comprising a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets 3 sandwiched in parallel 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 sandwiching the PTC heating element. The first mounting bracket has a base 19 and a cover 20. The base 19 is arranged along the heating element. The extended end of the electrode strip 2 has an open large cavity for accommodating the lead-out ends of the electrode strips 2 of different polarities of the heating device and the electrical connection part and the power harness connection line introduced into the power harness. The open large cavity also has an open small cavity 22 separated by a positioning insulating wall 21. The small cavity 22 accommodates and positions the heat-conducting surface or temperature controller 17 or temperature fuse 18 at the end of the heating device respectively. The temperature-sensing surfaces of the temperature controller 17 and the temperature fuse 18 are attached to the side of the positioning insulating wall 21 corresponding to the heat-conducting plane of the adjacent heating device. The angle between the cavity for positioning the temperature controller 17 and the temperature fuse 18 and the heat-conducting surface at the end of the heating device is 0-90°.

[0177] An open positioning cavity groove 23 for accommodating the power lead wire of the temperature fuse 18 is provided adjacent to the positioning insulating wall 21 of the open small cavity for positioning the temperature fuse 18 .

[0178] There is a notch 24 connecting the two cavities on the open small cavity 22 accommodating the temperature fuse 18 and the adjacent open positioning cavity 23 accommodating the power lead of the temperature fuse 18. The lead of the temperature fuse 18 is embedded in and positioned in the lead positioning cavity 23 through the notch 24. The temperature controller 17, temperature fuse 18, introduced power wiring harness and various connection points positioned in the open large cavity of the bracket base 19 are all sealed in the corresponding open large cavity through the cover 20.

[0179] 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.

[0180] 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.

[0181] 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.

[0182] 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.

[0183] 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.

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

[0185] Example 9

[0186] A PTC heating device assembly, including a PTC heater consisting of a PTC heating core, a heat-conducting aluminum tube 1, and a radiator, and a first mounting bracket, a second mounting bracket 16, and a power supply wiring harness connected to a temperature controller 17 and a temperature fuse 18. The heating core has a first electrode strip and a second electrode strip comprising a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets 3 sandwiched in parallel by the heat-conducting surfaces of the electrode strips 2, a heat-resistant insulating silicone 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 sandwiching the PTC heating element. The first The mounting bracket comprises a base 19 and a cover 20. The base 19 has a first cavity 26 along the extending end of the electrode strip 2 of the heating device for accommodating the lead-out ends of the electrode strips of different polarities of the heating device and the electrical connection part of the introduced power harness and the connection line of the power harness, and a second cavity for accommodating the radiator end of the heating device. In the second cavity, where the wall thickness of the heat dissipation surface of the end of the radiator 6 is in contact with the wall thickness, there is a small pit 28 for accommodating and positioning the temperature controller 17 and the temperature fuse 18. The depth of the small pit 28 is much smaller than the length of the temperature controller 17 and the temperature fuse 18.

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

[0188] A positioning cavity 23 for accommodating the power lead of the fuse 18 is provided adjacent to the positioning wall of the small pit body 28 for positioning the temperature fuse 18 .

[0189] There is a notch 24 connecting the small pit 28 and the positioning cavity 23 for accommodating the temperature fuse 18 and the partition wall of the positioning cavity 23 for the power lead of the adjacent temperature fuse 18. The lead of the temperature fuse 18 is embedded in and positioned in the positioning cavity 23 of the power lead through the notch 24.

[0190] 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.

[0191] 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.

[0192] 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.

[0193] 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.

[0194] 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.

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

[0196] Example 10

[0197] A PTC heating device assembly includes a PTC heater consisting of a PTC heating core, a heat-conducting aluminum tube 1, and a radiator 6, and a first mounting bracket, a second mounting bracket 16, and an incoming power supply harness connected to a temperature controller 17 and a temperature fuse 18, wherein the heating core has a first electrode strip and a second electrode strip comprising a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets 3 clamped in parallel by the heat-conducting surfaces of the electrode strips 2, a temperature-resistant insulating silicone 4 located between the PTC heating sheets 3 and the heat-conducting surfaces of the electrode strips 2, and a temperature-resistant insulating film 5 covering the electrode strips 2 clamping the PTC heating element, the first mounting bracket having a base 19 and a cover 20, the base 19 having an open large cavity along the extending end of the electrode strips 2 of the heating device for accommodating the lead-out ends of the electrode strips 2 of different polarities of the heating device and the electrical connection part of the incoming power supply harness and the connection line of the power supply harness, the open large cavity having a cavity 29 for accommodating the temperature controller 17 or the temperature fuse 18 along the thickness side 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 opening of the corresponding small cavity, and the power wiring harness introduced therein is positioned and accommodated in the open large cavity of the base body. After the base body 19 and the cover 20 close the open large cavity, the open part of the small cavity, the electrically connected part of the power wiring harness, and all 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 element.

[0202] There are at least two groups of heating elements, and the cavity 29 is located between and in contact with the heat-conducting planes of two adjacent groups of heating elements.

[0203] 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.

[0204] 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.

[0205] 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.

[0206] 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.

[0207] 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.

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

[0209] Example 11

[0210] A PTC heating device assembly includes a PTC heater consisting of a PTC heating core, a heat-conducting aluminum tube 1, and a radiator 6, and 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 heating core has a first electrode strip and a second electrode strip comprising a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets 3 clamped in parallel by the heat-conducting surfaces of the electrode strips 2, a temperature-resistant insulating silica gel 4 located between the PTC heating sheets 3 and the heat-conducting surfaces of the electrode strips 2, and a temperature-resistant insulating film 5 covering the electrode strips 2 clamping the PTC heating element. The first mounting bracket has a base 19 and a cover 20. There is a large open cavity in the base 19. After the electrical connection parts of different polarities are positioned in the large open cavity, the electrical connection parts of the power supply wiring harness connected thereto and the corresponding gaps of the electrode strips 2 at the lead-out end of the heating device are completely filled and sealed with insulating sealant.

[0211] The open large cavity is provided with a limiting insulating wall 30 along the outer side of the extended end of the lead-out end of the electrode strips of different polarities of the heating device. The lead-out electrode strips 2 of the heating device filled and sealed with the insulating sealant 14 and the electrical connection part of the power harness connected thereto and the corresponding insulating sealant are all positioned in the open small cavity surrounded by the limiting insulating wall 30.

[0212] The lead ends of the electrode strips 2 of different polarities positioned in the open large cavity and the surfaces of the corresponding electrical connection parts are covered with insulating heat shrink tubing, and the lead ends of the electrode strips 2 and the electrical connection parts connected thereto and the corresponding gaps are completely filled and sealed with insulating sealant 14.

[0213] 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.

[0214] 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.

[0215] 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.

[0216] 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.

[0217] 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.

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

[0219] Example 12

[0220] A PTC heating device assembly, including a PTC heating device assembly, wherein the open large cavity of the first bracket has a positioning slot for positioning the temperature controller 17 and the temperature fuse 18 and the power supply lines of different polarities connected to the input power supply, and one side of the positioning slot has an isolation wall 32 for accommodating and fixing the power supply line.

[0221] 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.

[0222] 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.

[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 sealing ring and completely cover the power harness;

[0234] 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.

[0235] The gaps between the third through hole, the sealing ring 36 and the wiring harness at the locations and joints are filled with insulation and sealant 14 .

[0236] 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.

[0237] 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.

[0238] 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.

[0239] 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.

[0240] 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.

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

[0242] Example 14

[0243] 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 lead-out ends of the electrode sheets 2 of different polarities and the charged surfaces of the connecting parts connected to the power supply wiring harness are covered with an insulating sleeve 37. The insulating sleeve 37 and the charged surfaces of the lead-out ends of the electrode sheets 2 and the connecting parts connected to the power supply wiring harness are all coated with a heat-resistant, insulating sealant 14.

[0244] The connection mode of the connecting part is that the plug spring 38 riveted on the wiring harness and the plug piece 39 connected to the lead end of the electrode piece 2 are plugged into each other.

[0245] The insulating sleeve 37 is an insulating rubber sleeve that matches the plug spring 38 .

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

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

[0248] 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.

[0249] 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.

[0250] 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.

[0251] 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.

[0252] 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.

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

[0254] Example 15

[0255] A PTC heating device assembly includes a PTC heating device, a first mounting bracket, a second mounting bracket 16, and a power supply wiring harness connected to a temperature controller 17 and a temperature fuse 18. The second mounting bracket 16 is inserted into 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 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 peripheral 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, a bathroom heater, a dehumidifier, an air purifier, a clothes dryer, a heater for a new energy vehicle, or a defroster.

Claims

1. A PTC heating device assembly, characterized in that: A PTC heater comprising a PTC heating core, a heat-conducting aluminum tube and a radiator, 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 heating core comprises a first electrode strip and a second electrode strip comprising a conductive surface and a heat-conducting surface, a plurality of PTC heating sheets clamped in parallel 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 comprises a base and a cover, the base extending along the electrode strips of the heating device The end is provided with an open large cavity for accommodating the lead-out ends of the electrode strips of different polarities of the heating device and the electrical connection part and the power supply harness connected to the power supply harness. The open large cavity also has an open small cavity separated by a positioning insulating wall. The small cavity respectively accommodates and positions the heat-conducting surface or temperature controller or temperature fuse at the end of the heating device. The temperature-sensing surface of the temperature controller and the temperature fuse is attached to the side of the positioning insulating wall corresponding to the heat-conducting plane of the adjacent heating device. The angle between the cavity for positioning the temperature controller and the temperature fuse and the heat-conducting surface at the end of the heating device is 0 to 90 degrees.

2. The PTC heating device assembly according to claim 1, characterized in that: An open positioning cavity groove for accommodating a power lead wire from the temperature fuse is provided on one side adjacent to the positioning insulating wall of the open small cavity for positioning the temperature fuse.

3. The PTC heating device assembly according to claim 1 or 2, characterized in that: The open small cavity accommodating the temperature fuse and the positioning insulating wall of the adjacent open positioning cavity groove accommodating the power lead of the temperature fuse have a notch connecting the two cavities. The lead of the temperature fuse is embedded in and positioned in the lead positioning cavity groove through the notch. The temperature controller, temperature fuse, introduced power wiring harness and various connection points positioned in the open large cavity of the bracket base are all sealed in the corresponding open large cavity by the sealing cover.

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