A PTC heat generating device

Abstract

The application discloses a PTC heating device, which comprises a heating core, a heat-conducting aluminum pipe and a radiator, and an arc column reinforcing rib is arranged on one side of the heat-conducting aluminum pipe of the heating device. The application improves the strength of the heating device, eliminates the hidden danger of the interference between a fuse lead wire and a body, and meets a series of structural, technological and reliability effects such as compact structure, reliable work and safe use.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of heat-sensitive ceramic heater, in particular, a kind of PTC heating device with main body reinforcing rib of heat-conducting aluminum pipe on side. BACKGROUND

[0002] A kind of PTC heat-sensitive ceramic electric heater support and PTC electric heater (publication number CN201174784), including installation surface and support surface, installation fixed heating element is provided on the support surface inner recessed cavity, the bottom of the inner recessed cavity is also provided with the cavity for placing the heating element power supply lead-out end connecting wire that extends inward, the support surface on the bottom of the cavity is provided with wire lead-out hole.The through hole for placing fuse is provided on the side wall of the support surface.

[0003] Through this technical scheme, the fuse can be combined with the support to prevent it from being connected to the periphery of the support and affecting safety, but since it is still installed on the side wall of the support surface, the connecting wire can still be wound on the outside of the support, and the power supply lead can still be loose and fall off under external force.

[0004] A kind of PTC heater support seat and PTC heater (publication number: CN200920235929), including seat body, cover plate and screw;The seat body and cover plate are fixedly connected by screw;The seat body is provided with a one-side open cavity, and the cavity is provided with interval upper wall and interval lower wall;The interval upper wall is located between the heating body of PTC heater and temperature controller;The interval lower wall is located between the heating body of PTC heater and temperature fuse.

[0005] Through this technical scheme, the temperature controller and temperature fuse can be installed in the support, and the positioning reliability of the temperature controller and the fuse is solved.But since the lead-out wire is prone to loosen and fall off under repeated pulling of external force, the live part of the two electrode sheets and the line group connection surface can also cause short circuit and contact sparking or loosening due to poor crimping.

[0006] PTC heater (publication number: 104053255A), two or more heaters share one tail seat and one electrical connection seat, temperature controller and temperature fuse are fixed in the electrical connection seat of bare road, and then the electrical plug cavity and electrical protection connection seat cover are inserted.The technology can solve the positioning problem of the installation of temperature controller and fuse in the electrical connection seat and tail seat, but still cannot solve the safety and reliability problems of displacement between parts inside the support seat body and power supply lead.

[0007] The above-mentioned prior art all have the problem that the power supply connection wire of heat-sensitive ceramic heater is not effectively insulated and fixed after being led out, and the installation of power supply connection wire inside the support is also prone to be affected by external pulling.

[0008] In addition, the existing cabinet type air conditioner uses a single group or multiple groups of parallel connection of the heat-sensitive ceramic heater material, and the power supply connection lines are interfered with each other after being led out, without effective insulation and fixation, and are affected by the whole machine assembly and transportation pulling, and are prone to falling off and short circuit safety accidents.

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

[0010] By adopting the technical scheme, the power supply line is directly connected with the electrode, the contact resistance is large, and the connection point of the power supply line is prone to falling off under the action of external force.

[0011] A PTC heating rapid electric water heater (publication number CN2742335Y), the wire on the electrical control device is connected with the plug on the heating device.

[0012] By adopting the technical scheme, the connection of the wire and the PTC electrode piece is completed with the help of the plug, the spring and the sheath to ensure the safety, and meanwhile, the plug is required to be inserted into the matching part, otherwise, the plug is prone to falling off from the PTC electrode piece and causing damage to the heater.

[0013] A PTC heating piece with a fastening terminal (publication number CN2684506Y), a buckle is arranged on the terminal, and the buckle is connected with the electrode plate by stamping. By adopting the technical scheme, the buckle is equivalent to the plug, the distance of stamping needs to be adjusted in real time, and the plug is prone to falling off from the PTC electrode piece or the butt joint spring to cause the heater to be not conductive, and the real-time adjustment needs to be manually monitored, which increases the cost.

[0014] In addition, the existing technology also adopts the connection scheme of the electrode piece stamping of the connecting piece with the flanged crimping surface or the wrapped corner crimping surface and the heating strip, the scheme can solve the reliable crimping problem of the wire group and the connecting piece, but since the flanged crimping surface or the wrapped corner crimping surface and the electrode piece are in surface contact, if the mutual fit is slightly uneven, the fit is prone to loosening and falling off. In addition, the flat punch of the stamping die simultaneously applies impact pressure to the two sides of the flange or the wrapped corner, since the contact between the electrode piece and the two sides of the flange or the wrapped corner is in line contact, the indentation is also concentrated on the line, and if the stamping die has a slight unevenness, the electrode piece is damaged and broken on the indentation line, and the whole heating strip and the wire group are scrapped.

[0015] In summary, the connection modes of the power supply line and the electrode piece of the above-mentioned existing technologies all have many safety and reliability hidden troubles such as poor contact, loose crimping and stamping damage.

[0016] Prior art: the conductive glue between the heating sheet and the electrode sheet, due to the conductive glue contains a large amount of metal conductive powder, resulting in the adhesive strength of the glue is greatly reduced. 2, the use of room temperature state of the rapid natural coagulation of silica gel, production and storage cost is also high, the use is not convenient. 3, the existing heating core for the rolling side after forming a groove, to improve the contact between the heating element and the electrode sheet and the aluminum tube heating surface, improve the thermal efficiency has a positive effect.

[0017] Prior art defects: 1, new industry CN00221004: (1) although it is set to be inserted in the side wall, front wall or top wall of the bracket and forward, backward, left or right and other ways, but it is limited that the temperature control temperature sensing surface must be close to the surface of the charged heat dissipation strip, which is easy to cause short circuit, leakage and other safety accidents, and is unreliable and difficult to operate and install. (2) the two insertion holes of temperature control and fuse are respectively deep into the inner wall of the cavity of the bracket, so that the power supply lead and the electrical connection point can only be exposed outside the bracket. (3) the cover plate is only used to block the temperature controller, and cannot solve the problem of exposed connection point of charged part, which brings great hidden danger of safety and reliability in use. 2, Xu Chengdong CN201420064071: the cover plate is exposed in the space on the surface of the bracket, which is easy to cause the water droplets to seep into the cavity of the temperature control and fuse, and bring safety hidden danger. 3, Guowei 200920235929: (1) the temperature control is located in the cavity of the bracket seat, and the temperature change of the temperature sensing surface of the temperature controller and the dry burning state difference when the abnormality occurs are not obvious under the ventilation working state, and a long recovery time is needed to make the temperature of the temperature sensing surface reach the protection temperature. (2) the temperature difference between the ventilation state and the dry burning state is not obvious, which is easy to cause misoperation. (3) the temperature control cavity is arranged in the seat of the bracket, which occupies a large space, and is easy to cause the interference between the power supply lines and the connection points of different polarity in the cavity of the seat, and cause short circuit or creeping and other major safety accidents.

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

[0019] Prior art: (1) there is no sealing glue in the cavity of the tail bracket, and the condensed water generated by the cold and hot temperature change of the environment when the heating device works is easy to seep into the tail part of the aluminum tube heating body, which causes short circuit. (2) Linzhi CN302536477S, the tail part has a non-sealing step, which cannot accommodate the sealing glue. (3) the tail part of the aluminum tube heating body is flush with or lower than the tail part of the radiator.

[0020] Prior art: Gree CN201010245871: (1) All power contacts are exposed on the surface of the bracket, which cannot solve the problem of leakage under the condition of sealing and moisture, and is not safe to use. (2) The combination part of the bracket and the heating device has no chamfer or groove, (3) The combination part has no sealing glue, and the gap between the combination parts is easy to penetrate water, which cannot guarantee the sealing performance and avoid the problem of water penetration and leakage under the condition of using in a humid environment, which is not safe to use. SUMMARY

[0021] Invention purpose: The purpose of the present application is to solve the problem that the existing PTC heating device tube releases thermal stress due to instantaneous cold and hot changes during frequent work of start-heating-shutdown cooling, which causes the loosening of the heat-conducting aluminum tube, and the gap between the heating element and the conductive electrode and the insulating layer, and the contact gap, which often causes the jump fire between the heating element and the electrode sheet, carbonization, and even the local high temperature caused by long-term jump fire, which causes the surface to be charged and the leakage, short circuit and breakdown, explosion, burning of flammable plastic indoor unit and a series of major and malignant safety accidents.

[0022] Technical solution: A PTC heating device, comprising a PTC heating core and a heat-conducting aluminum tube and a heat sink, 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 pieces held side by side by the heat-conducting surface of the electrode strip, a temperature-resistant insulating silicone located between the PTC heating piece and the heat-conducting surface of the electrode strip, and a temperature-resistant insulating film covering the electrode strip holding the PTC heating element, the heat-conducting aluminum tube side of the heating device has not less than one columnar reinforcing rib, the columnar reinforcing rib is located at the approximate center of the side of the heat-conducting aluminum tube heating body and is equal in length to the heat-conducting aluminum tube, and the cross section of the columnar reinforcing rib is approximately arc-shaped with a chord width of 0.3-2mm and an arch height of 0.2-2mm.

[0023] An electric appliance comprising a PTC heating device.

[0024] Further, the electric appliance is at least one selected from the group consisting of an air conditioner, a warm air machine, a hot air curtain machine, a bath heater, a dehumidifier, an air purifier, a clothes dryer, a new energy automobile warm air machine, or a defogging and frosting machine.

[0025] Advantages: The present application has the following advantages over the prior art:

[0026] The existing heating core is formed with a groove on the side after rolling, which has positive effect on improving the contact between the heating element, the electrode sheet and the heating surface of the aluminum tube, and improving the thermal efficiency. The present application can greatly improve and increase the bending caused by the stress released due to the thickness change of the heating core after rolling, and ensure the flatness and non-deformation of the product after rolling. For the length of 500-1000mm or more (1.5-5 matches between the hanging machine and the cabinet machine), the reinforcing rib on the side can greatly improve the bending and folding strength, and effectively eliminate and reduce the deformation caused by external force during the turnover, transportation and installation process.

[0027] In addition, the reinforcing rib on the side can also greatly improve and enhance the covering strength between the heat-conducting aluminum tube and the heating element, the conductive electrode sheet and the insulating layer covered inside, effectively eliminate the loosening of the heat-conducting aluminum tube caused by the release of thermal stress due to the instantaneous cold and hot changes during the frequent operation of the heating element in the tube, and the gap between the heating element and the conductive electrode and the insulating layer caused by the contact gap, and the surface charging and leakage caused by the melting of the insulating layer due to the local high temperature caused by the jumping fire and carbonization between the heating element and the electrode sheet, and the short circuit and breakdown, explosion and burning of the indoor unit of flammable plastic, and a series of major and malignant safety accidents.

[0028] Because the recess size into the aluminum tube cavity during the rolling process after the aluminum tube is inserted is smaller than that without the reinforcing rib, the damage of the insulating film caused by the extrusion of the side wall of the tube during the pressing process can be reduced, and the non-insulation safety hazard can be avoided.

[0029] The reinforcing rib on the side is more conducive to eliminating the irregular extension of the aluminum tube in the process of eliminating the gap between the parts in the tube and the tube wall (including the extension of the wall thickness of the aluminum tube) along the length and width directions after the tube is inserted and rolled, and under the premise of uniform extension, the electrode sheet, the insulating film and the PTC heating element inside the aluminum tube will be combined tightly in all directions with the heat-conducting inner wall of the aluminum tube, which will bring positive effect on improving the thermal efficiency, anti-aging performance and long-term reliability of the product.

[0030] Under the premise of uniform shrinkage of the aluminum tube and tighter combination between the parts in the tube, the product noise caused by the cold and hot changes can also be obviously improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The structure diagram of the heat-conducting aluminum tube with cylindrical reinforcing rib of the present application is shown. DETAILED DESCRIPTION

[0032] The present application will be further described below in combination with the drawings and examples.

[0033] Example 1

[0034] As Figure 1 shown, a PTC heating device, comprising a PTC heating core and a heat-conducting aluminum tube and a radiator, the heating core has a first electrode strip and a second electrode strip containing a conductive surface and a heat-conductive surface, a plurality of PTC heating pieces held side by side by the heat-conductive surface of the electrode strip 2, a temperature-resistant insulating silica gel between the PTC heating piece and the heat-conductive surface of the electrode strip 2, and a temperature-resistant insulating film 5 covering the electrode strip 2 holding the PTC heating element, the heat-conducting aluminum tube 1 side of the heating device has not less than one columnar reinforcing rib 15, the columnar reinforcing rib 15 is roughly in the middle of the side of the heat-conducting aluminum tube 1 heating body and is equal in length to the heat-conducting aluminum tube 1, the cross section of the columnar reinforcing rib 15 is roughly arc-shaped with a chord width of 0.3-2mm and an arch height of 0.2-2mm.

[0035] Example 2

[0036] An electric appliance containing a PTC heating device and an assembly.

[0037] The electric appliance is at least one selected from air conditioner, fan heater, hot air curtain machine, bath heater, dehumidifier, air purifier, clothes dryer, new energy automobile heater or defrosting device.

Claims

1. A PTC heat generating device, characterized by: The PTC heating core comprises a first electrode strip and a second electrode strip, each having a conductive surface and a heat-conductive surface; a plurality of PTC heating pieces held by the heat-conductive surfaces of the electrode strips; temperature-resistant insulating silica gel between the PTC heating pieces and the heat-conductive surfaces of the electrode strips; and a temperature-resistant insulating film covering the electrode strips holding the PTC heating pieces. The heat-conductive aluminum pipe of the heating device has at least one protruding columnar reinforcing rib arranged on the inner concave side. The columnar reinforcing rib is approximately in the middle of the side of the heat-conductive aluminum pipe and has the same length as the heat-conductive aluminum pipe. The cross section of the columnar reinforcing rib is approximately arc-shaped with a chord width of 0.3-2 mm and an arc height of 0.2-2 mm.

2. An electrical appliance characterized by: The PTC heating device of claim 1 is contained.

3. The appliance of claim 2, wherein The electric appliance is at least one selected from an air conditioner, a fan heater, a hot air curtain machine, a bathroom heater, a dehumidifier, an air purifier, a clothes dryer, a new energy automobile heater, and a defroster.

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