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(11) | EP 3 154 311 A1 |
| (12) | EUROPEAN PATENT APPLICATION |
| published in accordance with Art. 153(4) EPC |
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| (54) | HEAT DISSIPATION SUBSTRATE AND SEAL TYPE PTC THERMISTOR HEATER |
| (57) Disclosed is a radiating matrix and a sealed PTC thermister heater. The radiating
matrix includes a cavity body with a containing cavity, a plurality of radiating fins
are fixed in the middle of the external surface of the top and the external surface
of the bottom of the cavity body; a first positioning rib extending along a length
direction of the cavity body is arranged at the upper part and the lower part of the
inner wall of the left side of the cavity body in the containing cavity respectively,
correspondingly, a second positioning rib extending along a length direction of the
cavity body is arranged at the upper part and the lower part of the inner wall of
the right side of the cavity body in the containing cavity respectively, the internal
surface of the left side of the containing cavity between the two first positioning
ribs is an outwards convex arc surface, the internal surface of the right side of
the containing cavity between the two second positioning ribs is also an outwards
convex arc surface, and the outer wall of the left side and the outer wall of the
right side of the cavity body are of a slot-shaped structure extending along the length
direction of the cavity body; and an interval between the first positioning ribs and
an interval between the two second positioning ribs are both smaller than the thickness
of the PTC heating component, an interval between the first positioning rib and the
second positioning rib at the upper part and an interval between the first positioning
rib and the second positioning rib at the lower part are both smaller than the length
of the radiating ribs. The sealed PTC thermister heater according to the embodiments
can work for a long term without electrical safety hidden danger. |
BACKGROUND
Technical Field
[0001] The present application relates to a thermister heater, in particular to a radiating matrix and a sealed PTC (Positive Temperature Coefficient) thermister heater.
Related Art
[0002] A PTC thermister heater has unique characteristics of automatic constant temperature, no open flame, long service life, small influence from power voltage fluctuation, high electrothermal conversion rate and the like, and has been widely applied to electric appliance industries of air heater, clothes dryer, water heater, air conditioner, etc.
[0003] For the existing PTC heater, after a PTC heating element is placed in a containing cavity of an aluminum tube, the PTC heating element easily approaches to two side walls of the aluminum tube and is subjected to rigid press when press is applied to two sides of the aluminum tube to cause the aluminum tube to be deformed, the PTC heating element is easy to crush, quality hidden danger is caused and a user may worry about the quality.
SUMMARY
[0004] In order to make up the defects of prior art, the present application provides a radiating matrix and a sealed PTC thermister heater, which can work for a long term without electrical safety hidden danger.
[0005] A radiating matrix for containing a PTC heating component, comprises a cavity body, wherein the cavity body is provided with a hollow containing cavity extending along a length direction of the cavity body, a plurality of radiating fins are fixed in the middle of the external surface of the top and the external surface of the bottom of the cavity body, and the length of each radiating fin along a width direction of the cavity body is smaller than the width of the cavity body; a first positioning rib extending along a length direction of the cavity body is arranged at the upper part and the lower part of the inner wall of the left side of the cavity body in the containing cavity respectively, correspondingly, a second positioning rib extending along a length direction of the cavity body is arranged at the upper part and the lower part of the inner wall of the right side of the cavity body in the containing cavity respectively, the internal surface of the left side of the containing cavity between the two first positioning ribs is an outwards convex arc surface, the internal surface of the right side of the containing cavity between the two second positioning ribs is also an outwards convex arc surface, and the outer wall of the left side and the outer wall of the right side of the cavity body are of a slot-shaped structure extending along the length direction of the cavity body; an interval between the two first positioning ribs and an interval between the two second positioning ribs are both smaller than the thickness of the PTC heating component, an interval between the first positioning rib and the second positioning rib at the upper part and an interval between the first positioning rib and the second positioning rib at the lower part are both smaller than the length of the radiating ribs along the width direction of the cavity body.
[0006] In the above technical solution, the first positioning ribs and the second positioning ribs cause the PTC heating component to be positioned in the middle of the containing cavity together, and since the internal surface of the left side of the containing cavity between the two first positioning ribs is an outwards convex arc surface and the internal surface of the right side of the containing cavity between the two second positioning ribs is also an outwards convex arc surface, when the cavity body is molded, the left side and the right side of the cavity body are stressed and outwards deformed, the slot-shaped structures provide a deforming space, the lateral sides of the PTC heating component cannot be subjected to lateral press, so that the PTC heating component is difficult to crush and working is safer.
[0009] The existing radiating fins are machined in to a slab curve surface, such fins have bad strength and rigidity and are easy to fall off, the fins are easily attached together, cause impeded ventilating and generate certain wind resistance, and dust is easily accumulated on the fins, while in above technical solution, the radiating fins are designed into the convex concave corrugated structure, that is, the surfaces of the radiating fins are in convex and concave alternative arrangement, for example, the radiating fins can be a wavy curve surface, a zigzag curve surface and a trapezoid curve surface. The convex concave corrugated structure increases a radiating area and improves radiating efficiency; a reinforcing rib action can also be achieved for the radiating fins, thereby enhancing the rigidity and strength of the radiating fins; in a working process, the radiating fins are hard to fall off, thereby solving a series of problems caused by falling; and the strength and rigidity are good, the fins can be made thinner under the condition of the same radiating area, therefore material production cost can be greatly reduced and material can be saved.
[0012] Preferably, the cavity body is a rectangle body and the first positioning ribs and the second positioning ribs are symmetrically arranged.
[0013] Preferably, the internal surface of the top of the cavity body corresponding to the top surface of the PTC heating component has a low middle part and two high ends, and the internal surface of the bottom of the cavity body corresponding to the bottom surface of the PTC heating component has a high middle part and two low ends.
[0014] Due to the above technical solution, when the radiating matrix is molded, the rigid press to the PTC heating component from an aluminum tube can be reduced, thereby reducing damage to the PTC heating component.
[0015] A sealed PTC thermister heater comprises the radiating matrix, a PTC heating component and waterproof sealing parts, wherein the PTC heating component is positioned between the first positioning ribs and the second positioning ribs and is pressed in the middle of the containing cavity, and one waterproof sealing part is arranged at two ends of the containing cavity of the radiating matrix respectively.
[0016] Preferably, the PTC heating component comprises a PTC thermister, two electrode terminals connected with an external power source to be electrified to cause the PTC thermister to heat, metal electrode plates and insulation layers, wherein one metal electrode plate is attached to the upper surface and lower surface of the PTC thermister respectively, the two electrode terminals are positioned on the same side of the PTC thermister and connected with the metal electrode plates respectively, and the insulation layers wrap the peripheries of the metal electrode plates, and the two electrode terminals extend from the waterproof sealing parts.
[0017] Preferably, the waterproof sealing parts are waterproof insulating sealant capable of effectively blocking water.
BRIEF DESCRIPTION OF THE DRAWINGS
[0018]
FIG. 1 is a perspective view of - a radiating matrix according to an embodiment I of the present application;
FIG. 2 is a perspective view of a sealed PTC thermister heater according to an embodiment II of the present application; and
FIG. 3 is an exploded perspective view of FIG. 2.
DETAILED DESCRIPTION
[0019] The present application provides a radiating matrix, wherein the radiating matrix is used for containing a PTC heating component and the present application is described in detail by following preferable embodiments.
Embodiment I
[0020] As shown in FIG. 1, the radiating matrix 1 comprises a cavity body 11, wherein the cavity body 11 is a rectangle body and has a hollow containing cavity 12 extending along a length direction of the cavity body, a plurality of radiating fins 13 are fixed in the middle of the external surface of the top and the external surface of the bottom of the cavity body 11, the length of the radiating fin 13 at the external surface of the top of cavity body along a width direction of the cavity body 11 is smaller than the width of the top of the cavity body 11 and the length of the radiating fin 13 at the external surface of the bottom of cavity body along a width direction of the cavity body 11 is smaller than the width of the bottom of the cavity body 11. A first positioning rib 14 extending along a length direction of the cavity body is arranged at the upper part and the lower part of the inner wall of the left side of the cavity body in the containing cavity 12 respectively, symmetrically, a second positioning rib 15 extending along a length direction of the cavity body is arranged at the upper part and the lower part of the inner wall of the right side of the cavity body in the containing cavity respectively, the internal surface 16 of the left side of the containing cavity between the two first positioning ribs 14 is an outwards convex arc surface (that is, an opening of the arc surface is toward the containing cavity), the internal surface 17 of the right side of the containing cavity between the two second positioning ribs 15 is also an outwards convex arc surface, and the outer wall of the left side and the outer wall of the right side of the cavity body are of a slot-shaped structure 18 extending along the length direction of the cavity body. An interval between the two first positioning ribs 14 and an interval between the two second positioning ribs 15 are both smaller than the thickness of the PTC heating component, an interval between the first positioning rib 14 and the second positioning rib 14 at the upper part and an interval between the first positioning rib 14 and the second positioning rib 15 at the lower part are both smaller than the width of the radiating ribs 13, hence, when the radiating matrix is molded, the influence on the PTC heating component can be reduced as much as possible.
[0021] The radiating fins 13 at the top and bottom of the cavity body are parallel and equidistantly arrayed, the shape of each radiating fin 13 is of a convex concave corrugated structure, and in the present embodiment, the surface of the radiating fins are wavy curve surfaces. The radiating matrix is of an integrally molded structure and made of an aluminum profile, and specifically, the cavity body, the radiating fins, the first positioning ribs and the second positioning ribs are integrally made of the aluminum profile, and the radiating fins are made from backing-off cutting machining by a machine tool at the top and bottom of the radiating matrix.
[0022] The internal surface of the top of the cavity body 11 corresponding to the top surface of the PTC heating component has a low middle part 111 and two high ends 112, and the internal surface of the bottom of the cavity body corresponding to the bottom surface of the PTC heating component has a high middle part 113 and two low ends 114.
Embodiment II
[0023] As shown in FIGs. 2-3, the present application further provides a sealed PTC thermister heater, comprising the radiating matrix 1 in the embodiment I , the PTC heating component 2 and waterproof sealing parts 3, wherein the PTC heating component 2 is positioned between the first positioning ribs 14 and the second positioning ribs 15 and is pressed in the middle of the containing cavity, and one waterproof sealing part 3 is arranged at two ends of the containing cavity of the radiating matrix 1 respectively; the PTC heating component 2 comprises a PTC thermister 21, two electrode terminals 22 connected with an external power source to be electrified to cause the PTC thermister to heat, metal electrode plates 23 and insulation layers 24, wherein one metal electrode plate 23 is attached to the upper surface and lower surface of the PTC thermister 21 respectively, the metal electrode plates 23 provide a working voltage for the PCT thermister 21, the two electrode terminals 22 are positioned on the same side of the PTC thermister, one end of the electrode terminals 22 is connected with a power source by a lead and the other end of the electrode terminals 22 is connected with the metal electrode plate 23 (fixed by riveting or welding), hence, the metal electrode plates 23 can obtain the voltage provided by the power source and constitute a circuit loop together with the PTC thermister 21. The insulation layers 24 wrap the peripheries of the metal electrode plates 23, the two electrode terminals 22 extend from the waterproof sealing parts 3, and the waterproof sealing parts 3 are waterproof insulating sealant capable of effectively blocking water to cause the containing cavity to be fully closed.
Embodiment III
[0024] The embodiment III differs from the embodiment I in that the shape of the radiating fins on the radiating matrix is a zigzag curve surface.
[0025] The above specification merely describes the present application in further detail in combination with the preferable embodiments, and it should not be considered that specific implementations of the present application are limited to the description. Without departing from the inventive concept of the present application, those skilled in the art of the present application can make a plurality of simple derives or substitutions, for example, change the fins to be in a trapezoid shape, which should be regarded as belonging to the patent protective scope determined by claims of the present application.
1. A radiating matrix, for containing a PTC heating component, comprising a cavity body,
wherein the cavity body is provided with a hollow containing cavity extending along
a length direction of the cavity body, a plurality of radiating fins are fixed in
the middle of the external surface of the top and the external surface of the bottom
of the cavity body, and the length of each radiating fin along a width direction of
the cavity body is smaller than the width of the cavity body; and
a first positioning rib extending along a length direction of the cavity body is arranged at the upper part and the lower part of the inner wall of the left side of the cavity body in the containing cavity respectively, correspondingly, a second positioning rib extending along a length direction of the cavity body is arranged at the upper part and the lower part of the inner wall of the right side of the cavity body in the containing cavity respectively, the internal surface of the left side of the containing cavity between the two first positioning ribs is an outwards convex arc surface, the internal surface of the right side of the containing cavity between the two second positioning ribs is also an outwards convex arc surface, and the outer wall of the left side and the outer wall of the right side of the cavity body are of a slot-shaped structure extending along the length direction of the cavity body;
wherein an interval between the two first positioning ribs and an interval between the two second positioning ribs are both smaller than the thickness of the PTC heating component, an interval between the first positioning rib and the second positioning rib at the upper part and an interval between the first positioning rib and the second positioning rib at the lower part are both smaller than the length of the radiating ribs along the width direction of the cavity body.
a first positioning rib extending along a length direction of the cavity body is arranged at the upper part and the lower part of the inner wall of the left side of the cavity body in the containing cavity respectively, correspondingly, a second positioning rib extending along a length direction of the cavity body is arranged at the upper part and the lower part of the inner wall of the right side of the cavity body in the containing cavity respectively, the internal surface of the left side of the containing cavity between the two first positioning ribs is an outwards convex arc surface, the internal surface of the right side of the containing cavity between the two second positioning ribs is also an outwards convex arc surface, and the outer wall of the left side and the outer wall of the right side of the cavity body are of a slot-shaped structure extending along the length direction of the cavity body;
wherein an interval between the two first positioning ribs and an interval between the two second positioning ribs are both smaller than the thickness of the PTC heating component, an interval between the first positioning rib and the second positioning rib at the upper part and an interval between the first positioning rib and the second positioning rib at the lower part are both smaller than the length of the radiating ribs along the width direction of the cavity body.
2. The radiating matrix according to claim 1, characterized in that the plurality of radiating fins are parallel and equidistantly arrayed.
3. The radiating matrix according to claim 1, characterized in that each radiating fin is of a convex concave corrugated structure.
4. The radiating matrix according to claim 1, characterized in that the radiating matrix is of an integrally molded structure.
5. The radiating matrix according to claim 1, characterized in that the radiating matrix is made of an aluminum profile.
6. The radiating matrix according to claim 1, characterized in that the cavity body is a rectangle body and the first positioning ribs and the second
positioning ribs are symmetrically arranged.
7. The radiating matrix according to claim 1, characterized in that the internal surface of the top of the cavity body corresponding to the top surface
of the PTC heating component has a low middle part and two high ends, and the internal
surface of the bottom of the cavity body corresponding to the bottom surface of the
PTC heating component has a high middle part and two low ends.
8. A sealed PTC thermister heater, characterized by comprising the radiating matrix according to any one of claims 1-7, a PTC heating
component and waterproof sealing parts, wherein the PTC heating component is positioned
between the first positioning ribs and the second positioning ribs and is pressed
in the middle of the containing cavity, and one waterproof sealing part is arranged
at two ends of the containing cavity of the radiating matrix respectively.
9. The sealed PTC thermister heater according to claim 8, characterized in that the PTC heating component comprises a PTC thermister, two electrode terminals connected
with an external power source to be electrified to cause the PTC thermister to heat,
metal electrode plates and insulation layers, wherein one metal electrode plate is
attached to the upper surface and lower surface of the PTC thermister respectively,
the two electrode terminals are positioned on the same side of the PTC thermister
and connected with the metal electrode plates respectively, and the insulation layers
wrap the peripheries of the metal electrode plates, and the two electrode terminals
extend from the waterproof sealing parts.
10. The sealed PTC thermister heater according to claim 8 or 9, characterized in that the waterproof sealing parts are waterproof insulating sealant capable of effectively
blocking water.