CN2199653Y - Heat-sensitive ceramic electric heater and constant-temp. electric heating plate - Google Patents

Abstract

The utility model relates to the improvements of a heat-sensitive ceramic electric heater and an electric heating plate with constant temperature. The utility model is characterized in that an elastic heave electrodes and an insulating frame slot for bearing a PTC, and a machinery clamping method is used for making the PTC and both side electrodes maintain good electrical contact all along. The disadvantages that (conductive adhesive gluing) structural strength is poor, the structure is easy to degum and loosen in long-term use and a damaged PTC single block can not be singly replaced in the prior art are overcome. The electric-heating plate with the constant temperature assembled with a PTC heater and a cooling plate with fins is especially suitable for dehumidification drying for a power distributing cabinet with an electrical switch.

Description

Heat-sensitive ceramic electric heater and constant-temp. electric heating plate

Utility model is about the thermal sensitive ceramics thermal device, and is used for dehumidifying, drying electric hot plate.

Industry or family expenses dehumidifying, desiccant electric hot plate adopt the metallic resistance wire material to make pyrotoxin mostly, are equipped with temperature control equipment again.As Chinese patent 92212299.7 disclosed electric hot plates is that heating wire is through in the ceramic wafer in duct, is equipped with automatic temperature control device again.Long-term use continuously, resistance wire and/or automatic temperature control device in this electric hot plate, more fragile, and promptly need after the part damage all to change, make the use maintenance cost increase, particularly after thermostat is malfunctioning, be easy to cause electric plate temperature sharply to accumulate rising, the generation accident.

For overcoming above-mentioned prior art defective, also there is a plurality of thermal sensitive ceramicses (PTC) of employing heater element to be assembled into electric heating element, use conductive adhesive between each PTC heater element and two planar sheet battery lead plates.The defective of this electric heating element is the packaging technology complexity, structural strength is low, in use along with time lengthening, conducting resinl is easily aging, and be affected by thermal expansion and contraction, make between former PTC heater element that closely electrically contacts and the electrode to occur loosely, even come unstuck, just the loose contact arcing can occur between electrode and PTC heater element, directly influence useful life.And the damage of single PTC heater element can't be changed separately, causes the monoblock electric heating element to be scrapped.In addition since between PTC heater element and the battery lead plate every with the relatively large conducting resinl of thermal resistance, thereby make the main heat efficiency of the PTC electric heating element of conduction heat transfer that relies on not give full play to, therefore there are the problems referred to above equally in the electric hot plate with above-mentioned heater making.

The purpose of utility model is for overcoming the deficiency of above-mentioned prior art, provide a kind of structural strength good, without the conducting resinl bonding, can make electric heating element and electrode remain tight the contact, but and the thermal sensitive ceramics electric heating element of monolithic replacing heater element again.

Another purpose of utility model is to provide a kind of thermostatic electrothermal plate that uses above-mentioned electric heating element to make thermal source.

A utility model purpose again provides a kind of thermal sensitive ceramics thermostatic electrothermal plate with big area of dissipation and better heat dissipation effect.

For realizing above-mentioned first purpose, the thermal sensitive ceramics electric heating element that utility model proposes, the upper and lower electrode slice that comprises several PTC heater elements and each PTC heater element is electrically connected, it is characterized in that it is the elastic heave electrode that described upper and lower electrode slice has a slice at least, the electrode of a described PTC heater element and a side has an electric insulation frame support, one clamping device will power on pole piece, PTC heater element, bottom electrode sheet, the tight crimping combination of electric insulation frame closely electrically contact PTC and two lateral electrodes.

The elastic heave electrode can better realize PTC and electrode mechanical pressing, contact, and make combination become tightr, can guarantee electrode and PTC excellent electric contact, the electrode pair of elastic heave simultaneously PTC expands with heat and contract with cold better buffering is arranged, and guarantees that electrode and PTC are in good electrically contacting all the time.Electrode according to utility model PTC both sides can be a planar sheet electrode, an elastic heave electrode; Also can be that PTC two lateral electrodes are the elastic heave electrode.The elastic heave electrode can be that electrode is bent into the wave indentation, also can be that electrode slice is bent out the perk electric connecting plate.Insulation frame one can make a PTC and a lateral electrode be in state of insulation, and metalwork crimping easy to use is sealed; It two can make the PTC element that one stable support is arranged, and helps improving overall construction intensity; It three helps the directional transmissions heat.Can adopt as resistant to elevated temperatures plastics or ceramic making, the insulation frame can be made the little bulk that puts single PTC element, also can make the strip that puts several piece.As make the little bulk that puts single PTC element, and for helping the connection of each PTC electrode, can on the frame groove, offer the electrode connectivity slot, like this as long as the electrode slice punching out is become definite shape, just can make several insulation frames be arranged in strip, and each electrode is communicated with.The clamping device effect mainly makes top electrode, PTC element, bottom electrode, insulation frame keep closely contact and in aggregates, and it can be to adopt common mechanical grip mode such as clamping, bolt to clamp, and also the electrode that exposes can be made Or Envelope shape is with insulation frame and interior electrode thereof, PTC heater element bag pressure together in it.Become state of insulation because a PTC and a lateral electrode are placed in the insulation frame, can directly use metalwork to compress combination.

Utility model second purpose realizes the upper and lower electrode slice that its formation comprises several PTC heater elements and each PTC heater element is electrically connected, it is characterized in that it is the elastic heave electrode that described upper and lower electrode slice has a slice at least, the electrode of a described PTC heater element and a side has an electric insulation frame support, there is a resistant to elevated temperatures electric insulation layer in another electrode outside, there is a metallic heat radiating plate in the electric insulation layer outside, and a clamping device is with heating panel, electric insulation layer, top electrode, PTC heater element, bottom electrode, the tight crimping combination of electric insulation frame.The heat of PTC heater element generation is by electrode slice like this, and electric insulation layer passes to metallic heat radiating plate, is outwards dispersed by metallic heat radiating plate again.As previously mentioned, clamping device can be that common mechanical grip mode such as clamping plate, bolt clamp, and also can directly metallic heat radiating plate be bent into

Envelope shape.The effect of the electric insulation layer buffer action that mainly electrifies makes electric hot plate integral body be electric insulating state, and for by the alternate manner electric insulation, its electric insulation layer also can omit.Electric insulation layer can adopt as the mica sheet insulating barrier, also can adopt high-temperature insulation coating.

Utility model the 3rd purpose realizes, it is characterized in that above-mentioned metallic heat radiating plate is made the surface radiating fin, to increase area of dissipation, improves radiating effect.

Utility model thermal sensitive ceramics electric heating element owing to adopt the elastic heave electrode slice, thereby can make PTC and electrode can adopt mechanical crimping, and can make between PTC and electrode slice and remain good the contact.It is low to have overcome the prior art structural strength, and the meeting appearance is loose between PTC and electrode slice in long-term use, produces electric arcing, so that damages the defective of PTC heater element.Owing to adopt mechanical crimping mode, even certain PTC heater element damages, also can change separately in addition, reduce maintenance cost, the conducting resinl that there is thermal resistance in one deck has been omitted in mechanical crimping, to improving the electric heating element heat-transfer effect facilitation is also arranged.Electric hot plate with this electric heating element assembling is superior than prior art equally, and radiating fin has increased area of dissipation greatly, has significantly improved the radiating effect of electric hot plate.The utility model electric heating element can be widely used in the various occasions that need heating, and the electric hot plate of assembling especially is suitable for electric switch, the removal moisture drying of power distribution cabinet.

Fig. 1 is a kind of structural representation of electric hot plate.

Fig. 2 is the structural representation of band radiating fin electric hot plate.

Embodiment 1: referring to Fig. 1, be followed successively by metallic heat radiating plate 2 from top to bottom, mica electric insulation layer 3, porose 4 last plane electrode sheet 5, PTC heater element 6, the bottom electrode 7 of flexible protuberance, put the insulation frame 8 of bottom electrode and PTC, clamping plate 9, and have the screw 1 that vertically runs through to be fixedly clamped.The through hole 4 that powers on the pole piece 5 mainly plays electric buffer action.

Embodiment 2: referring to Fig. 2, be followed successively by the metallic heat radiating plate 2 of band radiating fin 10 from top to bottom, mica electric insulation layer 3, the porose pole piece 5 that powers on, ring-shaped P TC heater element 6, a plurality of connection elastic heave bottom electrodes 7, annular insulation frame groove 8, have on it and can make electrode communication groove 11, assembly has bolt 1 to be fixedly clamped.

Omission metallic heat radiating plate and mica electric insulation layer are electric heating element in the foregoing description.

The concrete formation of utility model is not subjected to the qualification of above-mentioned drawings and Examples, as the concrete configuration of electrode slice, and insulation frame configuration, clamping device configuration etc. all can be done the change of some non-intrinsically safes.

Claims (3)

1, a kind of thermal sensitive ceramics electric heating element, the power-on and power-off pole piece that comprises several PTC heater elements and each PTC heater element is electrically connected, it is characterized in that it is the elastic heave electrode that described upper and lower electrode slice has a slice at least, the electrode of a described PTC heater element and a side has an electric insulation frame support, the tight crimping combination of pole piece, PTC heater element, bottom electrode sheet, electric insulation frame that will power on of one clamping device closely electrically contacts PTC and two lateral electrodes.

2, a kind of thermostatic electrothermal plate of thermal sensitive ceramics composition, the upper and lower electrode slice that comprises several PTC heater elements and each PTC heater element is electrically connected, it is characterized in that it is the elastic heave electrode that described upper and lower electrode slice has a slice at least, a described PTC heater element and a lateral electrode have an electric insulation frame support, there is a resistant to elevated temperatures electric insulation layer in another electrode outside, there is a metallic heat radiating plate in the electric insulation layer outside, and a clamping device is with heating panel, electric insulation layer, top electrode, PTC heater element, bottom electrode, the tight crimping combination of electric edge frame.

3,, it is characterized in that outstanding radiating fin is arranged on the described metallic heat radiating plate according to the described constant temperature electroplax of claim 2.

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