CN210899647U

CN210899647U - PTC heating device

Info

Publication number: CN210899647U
Application number: CN201821390186.6U
Authority: CN
Inventors: 蒋国屏; 李宁泰; 许立国
Original assignee: Suzhou Guowei Temperature Sensitive New Material Co ltd
Current assignee: Suzhou Guowei Temperature Sensitive New Material Co ltd
Priority date: 2018-08-21
Filing date: 2018-08-21
Publication date: 2020-06-30
Anticipated expiration: 2028-08-21

Abstract

The utility model discloses a PTC heating device, a group of heat dissipation strip and PTC heat sensitive material heating elements attached on the heat conducting strip of the heat dissipation strip, temperature resistant silica gel is arranged between the heat conducting plane of the heat conducting strip and the heating plane of the heating sheet, the clamping force of the tool is 2-10Kg, and the number of the heating sheets is not less than 4; the heat conducting fins of the heat dissipation strips are provided with extension surfaces, the tail ends of the extension surfaces are connection surfaces, the angle between each extension surface and each connection surface is 45-180 degrees, and the connection surfaces are provided with connection parts for connecting power wiring harnesses; the heat sink is characterized in that a through hole is formed in a connecting surface of an extending surface of a heat conducting fin of the heat dissipation strip, the thickness of the connecting surface is 0.25-1.5mm, the diameter of the through hole is 1.5-6.0mm, the connecting surface is approximately vertical to the extending surface, and the connecting surface is arranged at the tail end of the extending surface.

Description

PTC heating device

Technical Field

The utility model relates to a heater, especially a PTC heating device.

Background

(publication No. CN105953423A) and lead-out terminal, unreliable connection and high cost

(publication Nos. CN202799212U, CN2640002Y, CN2331140Y, CN2346042Y, and 201621441888.3 and 201720111877.7), all of which have a structure in which a tab is connected to a power supply inlet

The prior art has the safety accidents that the power supply connection part of the PTC thermosensitive material heating device is easy to loosen and short circuit caused by drawing influence. In addition, the insertion sheet, the insertion spring and the sheath are required to be added, so that the material cost of the product is greatly increased.

201420555835.9 spray welding

201720221741.1 the power line is directly pressed on the leading-out terminal, the pressed part is twisted slightly and is easy to break.

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

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

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

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

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

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

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

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model provides a technical problem all have the security problem of contact failure, crimping not hard up, impaired a great deal of security and reliability hidden danger such as punching press for the connected mode of current power cord and electrode slice.

The technical scheme is as follows: the utility model provides a following technical scheme:

the utility model provides a PTC heating device, the heat dissipation strip is in with the laminating PTC temperature sensing material heating element on the conducting strip of heat dissipation strip is a set of, the heat conduction plane of heat dissipation strip conducting strip with there is temperature resistant silica gel between the plane that generates heat of piece, the heater is by the centre gripping make the silica gel solidification in special frock, demolish the frock after, form promptly laminate inseparable, firm integrative PTC heating device between heat dissipation strip and PTC temperature sensing material heating element, the clamping-force of frock is 2-10Kg, the piece that generates heat is no less than 4.

Furthermore, the heat conducting fins of the heat dissipation strips are provided with extension faces, the tail ends of the extension faces are connection faces, the angle between each extension face and each connection face is 45-180 degrees, and the connection faces are provided with connection portions for connecting power wiring harnesses.

Furthermore, a through hole is formed in a connecting surface of an extending surface of the heat conducting fin of the heat dissipation strip, the thickness of the connecting surface is 0.25-1.5mm, and the diameter of the through hole is 1.5-6.0 mm.

The thickness of the connecting surface is the thickness of the heat conducting fin of the heat dissipation strip.

Furthermore, a conducting plate is attached to the connecting surface, a riveting hole corresponding to the through hole in the connecting surface is formed in a conducting plane of the conducting plate, and the other end of the conducting plate is connected with a lead-in power core wire.

Further, the connection surface and the extension surface are substantially perpendicular, the connection surface being at a distal end of the extension surface.

The requirement of different installation space, position and distance in the adaptation different products increases the commonality.

Furthermore, after the connecting surface of the heat dissipation strip and the butt joint flat sheet are riveted into a whole, the input power supply wire harness and the heater are rigidly connected into a whole.

The existing connection mode of the heater body and the power supply is that a heat dissipation ripple leading-out end of the heater is riveted with an insertion sheet, an introduction end of the power supply is connected with an elastic insertion spring in a pressing mode, and the insertion spring is inserted into the insertion sheet manually. 1. From the structural principle: the connection and positioning of the inserting spring and the inserting sheet are realized by the contact positioning of two convex arc-shaped elastic surfaces of the inserting spring and a conductive surface of the inserting sheet and the embedding of a small convex point designed on the inelastic arc surface in the middle of the inserting spring into a corresponding small round hole at the head of the inserting sheet. The principle of line contact positioning between the elastic cambered surface of the inserting spring and the conductive plane of the inserting sheet is as follows: because the inserted sheet is made through the punching press, its conducting surface can't carry out surface machining, because the thickness error of inserted sheet itself, the tiny deformation that the punching press process leads to, the line contact in principle must be the result that the protruding position of the elasticity cambered surface of inserted spring and inserted sheet conducting surface is elastic point contact in fact. From the little bump of inserted spring and the location principle that the inserted sheet corresponds little round hole: in the production process of the inserting spring and the inserting sheet and the butt joint process of the inserting sheet and the inserting spring of the heater, because the difference of the inserting action, the inserting force and the inserting position when the inserting spring and the inserting sheet are inserted is received manually, the difficulty of accurate positioning when the inserting spring and the inserting sheet are butted is very large, the small salient point of the inserting spring cannot be accurately sunk in the middle of the small circular hole of the inserting sheet and cannot be easily perceived due to slight deviation, in addition, the small salient point of the inserting spring and the small circular hole of the inserting sheet are produced in batches through punching, abrasion is caused, the strength of the salient point and the strength of the circular hole are influenced by errors such as materials, the abrasion resistance is realized, the service life is prolonged. 3. The heating device or the product with the heating device is subjected to dynamic factors such as turnover, transportation and the like, so that the loosening of the connecting part of the product caused by the loosening and displacement of the butt joint part in production, assembly and customer use is inevitable, and a great functional accident of heater failure is caused. Because the plug spring of power input end is electrified, in case the electrified body of plug spring that takes off touches other positions or on the different polarity of product, will lead to major safety accident such as product electrification, short circuit fire. 4. Because the butt joint part of the heater is connected with the heating body, under a long-term high-temperature working environment, the elastic pressure of the inserting spring is inevitably reduced due to the influence of factors such as the material and the processing precision of the inserting spring, and the butt joint points are subjected to flashover and carbonization due to looseness and poor contact, so that the serious hidden trouble of open circuit or short circuit connection is caused.

Furthermore, the riveting part of the heater and the wire harness and the surface electrified part are sleeved with a temperature-resistant heat-shrinkable sleeve for insulation and heat sealing.

Furthermore, the surface of the riveting joint of the heater and the surface electrified part of the connecting part of the temperature-resistant heat-shrinkable sleeve are coated with insulating glue.

The charged part on the surface is completely insulated, and the hidden trouble of short circuit caused by serious abnormality of the working state is avoided.

Further, the heaters are multiple groups of parallel combinations of similar structures.

Has the advantages that: compared with the prior art, the utility model:

the connection of the heating device and the input power supply is realized by punching or riveting a butt joint insertion sheet on a heat conduction/electric conduction sheet of the heat dissipation strip, connecting wire harnesses are in press joint at a press joint part of a connecting insertion spring, and the other end of the insertion spring is in elastic butt joint with the butt joint insertion sheet. The prior art has the defects that: 1. the pressure point of the heat conducting sheet is pressed and loosened to cause loosening or connection loosening to cause striking fire due to stamping, riveting or welding of the butt joint insertion sheet. 2. Because the butt joint of inserted sheet and inserted spring is not in place and leads to the inaccurate open circuit hidden danger that leads to the pine between inserted spring and inserted sheet between inserted sheet and inserted sheet. 3. After the inserting spring and the inserting sheet are butted, an elastic and loose silica gel insulating sheath is sleeved on a joint, so that the potential safety hazard that a charged part is exposed due to the sliding of the sheath is easily generated, although the technology of coating sealant on the joint of the inserting spring and the inserting sheet is adopted to remedy the contact sparking caused by the connection gap and the loose connection, the potential safety hazard of the loose contact can not be eliminated due to the existence of the contact gap under the long-term use state. 4. The heat conduction/conducting strip is easy to be damaged during crimping and is twisted by external force during use, so that open-circuit failure hidden trouble caused by twisting of the crimping damage part is easy to generate.

The utility model discloses the effect that reaches: 1. the connection of the heating device and the input power supply realizes that the electric connection mode is changed from the traditional oppositely-inserted elastic connection into the rigid connection of the crimping type by directly riveting through holes on the conducting strips of the wire harness and through holes positioned on the connecting surface at the tail end of the extending surface of the heat conducting/conducting strips. 2. The electric conduction mode is changed from the traditional line contact between the insertion piece and the insertion spring by the insertion spring outer convex rib and the insertion piece plane into the surface contact between the connection piece plane and the conducting strip plane, so that the electric connection reliability of the product is greatly improved. 3. The riveting between the insertion sheet and the conducting sheet of the radiating strip and the butt joint between the insertion spring and the insertion sheet are omitted, the process of the middle transition part of electric connection is omitted, the safety is improved, and the process is simple. 4. The insulating heat-shrinkable sleeve is heat-sealed at the electrified part of the crimping point, and the surface electrified part and the crimping connection point are firmly coated by the heat-shrinkable sleeve, so that the safety performance is improved. 5. The electric connection part's security, reliability and life's permanence have thoroughly been guaranteed on the electrified part of the face of connecting and heat-shrinkable tube surface in insulating heat-shrinkable tube's the terminal face of extending and the utility model point of coating insulating gum in addition. 6. The concave-convex groove designed at the through hole of the connecting surface at the tail end of the extending surface increases the contact area of the electric connection part during crimping, improves the connection reliability, improves the crimping effect and thoroughly eliminates the hidden danger of contact sparking caused by the electric connection gap caused by the loosening of the crimping. 7. A reinforcing structure of strip-shaped anti-breaking concave grooves or outer convex ribs is designed at the transition position of the extending surface and the connecting surface, so that the strength, the anti-breaking performance and the anti-twisting performance of the transition joint surface of the extending surface and the connecting surface are improved. 8. The utility model discloses a another is showing the effect and has saved accessories such as inserted sheet, plug spring, elasticity silica gel sheath that prior art must adopt, greatly reduced the cost of product.

Drawings

FIG. 1 is a schematic view of the heating device of the present invention with the connecting surface and the extending surface perpendicular to each other;

FIG. 2 is a schematic structural view of a butt-joint flat sheet of the heating device of the present invention;

fig. 3 is a schematic structural diagram of the heating device of the present invention after the connection surface and the extension surface are vertically connected to the power supply.

Detailed Description

The utility model provides a thinking and method, the method and the way of specifically realizing this technical scheme are many, above only the utility model discloses a preferred embodiment should point out, to the ordinary technical personnel in this technical field, not deviating from the utility model discloses under the prerequisite of principle, can also make a plurality of improvements and moist decorations, these improvements should also be regarded as the utility model discloses a protection range, each component that does not make clear and definite in this embodiment all can be realized with prior art.

Example 1

The utility model provides a PTC heating device, at least one heat dissipation strip 1 is in with the laminating PTC temperature sensing material heating element on the conducting strip of heat dissipation strip 1 is a set of, the conducting strip of heat dissipation strip with there is temperature resistant silica gel 2 between the face that generates heat of piece, the heater is by centre gripping messenger silica gel complete solidification in special frock, after dismantling the frock, forms promptly laminate inseparable, firm integrative PTC heating device between heat dissipation strip 1 and PTC temperature sensing material heating element, the clamping-force of frock is 4-10Kg, the piece that generates heat is no less than 4.

Example 2

The heat conducting fin of the heat dissipation strip 1 is a power supply lead-in end, the lead-in end is provided with an extension face 3, an angle between the extension face 3 and the lead-in end is 45 degrees, the tail end of the lead-in end is a connection face 4, the end part of the connection face 4 is a crimping part 5, the crimping part 5 is provided with a through hole 6, the thickness of the crimping part 5 is 0.25-1.5mm, and the diameter of the through hole 6 is 1.5-6.0 mm.

The crimping portion functions as a butt flat for riveting the power supply lead. The thickness of the general leading-out surface is 0.2-0.4mm, the strength is low, the deformation is easy, the function of the existing through hole is to rivet the inserting sheet, the inserting spring is butted on the inserting sheet, and the aperture is smaller than 2 mm.

The connecting surface 4 and the extending surface 3 are integrated, a pressure connecting part 5 is arranged on the connecting surface 4, and the pressure connecting part 5 is arranged at the tail end of the extending surface 3.

The tail end of the extension surface is used for riveting and connecting the butting surface of the power supply lead.

The crimping part 5 is attached with a butt joint flat sheet 7, one end of the butt joint flat sheet 7 is provided with a crimping groove 8 for containing an introduced power core wire and an insulation covering layer, the power core wire and the insulation covering layer are crimped in the groove 8, and a riveting hole 10 corresponding to the through hole 6 of the crimping part 5 is formed in a butt joint plane 9 at the other end.

After the crimping part 5 of the heat dissipation strip and the butt joint flat sheet 7 are riveted into a whole through a rivet, the input power supply wire harness and the heater are rigidly connected into a whole.

And the riveting part between the crimping part 5 of the heater and the butt joint flat sheet 7 is sleeved with a temperature-resistant heat-shrinkable sleeve for insulation and heat sealing.

The heaters may be multiple sets of parallel combinations of similar structures.

Example 3

The heat conducting fin of the heat dissipation strip 1 is a power supply lead-in end, the lead-in end is provided with an extension face 3, an angle between the extension face 3 and the lead-in end is 90 degrees, the tail end of the lead-in end is a connection face 4, the end part of the connection face 4 is a crimping part 5, the crimping part 5 is provided with a through hole 6, the thickness of the crimping part 5 is 0.25-1.5mm, and the diameter of the through hole 6 is 1.5-6.0 mm.

The connecting surface 4 is vertical to and integrated with the extension surface 3, a pressure connecting part 5 is arranged on the connecting surface 4, and the pressure connecting part 5 is arranged at the tail end of the extension surface 3.

After the crimping part 5 of the heat dissipation strip 1 and the butt joint flat sheet 7 are riveted into a whole through a rivet, the input power supply wire harness and the heater are rigidly connected into a whole.

The connecting surface 4 is parallel to and integrated with the extension surface 3, and a pressure connection part 5 is arranged on the connecting surface 4, and the pressure connection part 5 is arranged at the tail end of the extension surface 3.

Claims

1. A PTC heating device, characterized in that: the heat dissipation strip and the PTC heat-sensitive material heating elements attached to the heat conducting fins of the heat dissipation strip are in a group, temperature-resistant silica gel is arranged between the heat conducting plane of the heat conducting fins of the heat dissipation strip and the heating plane of the heating fins, the heater is clamped in a special tool to solidify the silica gel, after the tool is removed, a PTC heating device with the heat dissipation strip and the PTC heat-sensitive material heating elements tightly and firmly attached is formed, the clamping force of the tool is 2-10Kg, and the number of the heating fins is not less than 4; the heat conducting fins of the heat dissipation strips are provided with extension surfaces, the tail ends of the extension surfaces are connection surfaces, the angle between each extension surface and each connection surface is 45-180 degrees, and the connection surfaces are provided with connection parts for connecting power wiring harnesses; the heat sink is characterized in that a through hole is formed in a connecting surface of an extending surface of a heat conducting fin of the heat dissipation strip, the thickness of the connecting surface is 0.25-1.5mm, the diameter of the through hole is 1.5-6.0mm, the connecting surface is approximately parallel to the extending surface and is integrated with the extending surface, and the connecting surface is arranged at the tail end of the extending surface.

2. A PTC heating device according to claim 1, wherein: the connecting surface is attached with a conducting plate, a riveting hole corresponding to the through hole in the connecting surface is formed in a conducting plane of the conducting plate, and the other end of the conducting plate is connected with a lead-in power core wire.

3. A PTC heating device according to claim 1, wherein: the riveting part and the surface electrified part of the heater and the wire harness are sleeved with a temperature-resistant heat-shrinkable sleeve for insulation and heat sealing.

4. A PTC heating device according to claim 3, wherein: the surface of the riveting joint of the heater and the electrified part of the surface of the connecting part are coated with insulating glue.

5. A PTC heating device according to claim 4, characterized in that: the heaters are multiple sets of parallel combinations of similar structures.