CN2393295Y

CN2393295Y - Five-layer structure all-ceramic electrothermal body having external conductive layer

Info

Publication number: CN2393295Y
Application number: CN 99241174
Authority: CN
Inventors: 雷彼得
Original assignee: Individual
Current assignee: Chongqing Lima High Science & Technology Ceramic Co Ltd
Priority date: 1999-09-20
Filing date: 1999-09-20
Publication date: 2000-08-23
Anticipated expiration: 2009-09-20

Abstract

The utility model relates to a five-layer structure all-ceramic electrothermal body with an external conductive layer, which comprises a resistive layer, an insulating layer, an internal conductive layer, an internal core layer, the external conductive layer and an electrode socket, wherein, the internal core layer is positioned at the center of the electrothermal body; the internal conductive layer is wrapped on the outside of the internal core layer; the insulating layer is wrapped on the outside of the internal conductive layer; the resistive layer is wrapped on the outside of the insulating layer. The top of the insulating layer is connected with a communicating pore; the resistive layer is connected with the internal conducting layer at the communicating pore. The resistive layer is provided with an upper segment with a small diameter and a conic lower segment with a large diameter; the external conductive layer is wrapped on the outside of the lower segment; the electrode socket is positioned on the lower segment at the center of the internal core layer. The utility model is used for heating and igniting and has the advantages of high product qualification rate and low cost.

Description

The five-layer structure full-ceramic electrically-heated body that outer conducting layer is arranged

The utility model belongs to the electric heating element technical field.

Full-ceramic electrically-heated body is a kind of new electrically heating device, is used for electric heating and electric ignition.The prior art full-ceramic electrically-heated body is a three-decker, and Chinese patent ZL98228228.1 electrothermal all-ceramic plug core for example comprises resistive layer, three layers of insulating barrier and inner core conductive layers relatively.Resistive layer connects with the intercommunicating pore place of inner core conductive layer on relative insulating barrier top, and the hypomere of resistive layer is connected with the conducting metal housing of glow plug.When adding voltage between inner core conductive layer and metallic object housing, resistive layer promptly produces high temperature by electric current, lights a fire.The glow plug core has upper and lower two sections, and the epimere diameter is less, and during heating power, heat concentrates on the epimere of minor diameter.When adding voltage to resistive layer, epimere and hypomere respectively distribute certain voltage.In the mill, because formula rate and manufacturing process are as the fine difference of perfusion, sintering process parameter, even in a collection of product, the resistance value of resistive layer hypomere also can be not the same, and when putting a spot ignition voltage, the voltage that is distributed on epimere and hypomere can not keep constant value, cause with the caloric value of each glow plug core epimere in a collection of product equal not to the utmost, even difference is very big, the big temperature height of the caloric value that has, and the little temperature of the caloric value that has is low.The glow plug core misfire that temperature is low excessively, the too high structural stratification that then causes of temperature is peeled off and is cracked.Product quality is wayward, and qualification rate is low, the cost height.

The purpose of this utility model is to provide a kind of one deck structure full-ceramic electrically-heated body that outer conducting layer is arranged.

The purpose of this utility model be achieved in that a kind of five-layer structure full-ceramic electrically-heated body that outer conducting layer is arranged, comprise resistive layer, insulating barrier, inner conducting layer, inner sandwich layer, outer conducting layer and electrode jack relatively.Inner sandwich layer is positioned at the centre of electric heating element, and inner conducting layer is coated on the outside of inner sandwich layer, and insulating barrier is coated on the outside of inner conducting layer relatively, and resistive layer is coated on the outside of relative insulating barrier.Inner sandwich layer and inner conducting layer all can conduct electricity.There is an intercommunicating pore on top at relative insulating barrier, and resistive layer is connected at this intercommunicating pore place with inner conducting layer, forms conductive channel.Resistive layer has upper and lower two sections, and the epimere diameter is less to be the heating work section, and big its appearance of hypomere diameter is the part of cone.Outer conducting layer is coated on the outside of resistive layer hypomere, is connected with the electric heating element metal shell of conduction.Electrode jack is positioned on the centerline axis of inner sandwich layer hypomere, is a blind hole that does not connect, and electrode inserts thus.Operating voltage is added between electrode and the outer conducting layer, and electric current is by electrode, inner sandwich layer, inner conducting layer, resistive layer epimere and outer conducting layer, and the resistive layer epimere promptly produces heat and sends high temperature.

The utility model has the advantages that: when adding voltage to resistive layer, voltage is almost concentrated on the epimere of the minor diameter that is added in resistive layer, hypomere then distributes voltage very little, thereby reduced to make owing to the influence that fabrication process parameters changes the change greatly of resistance and bent this voltage that is distributed that causes of hypomere to a great extent, the epimere caloric value that has solved electric heating element basically can not keep the problem of steady state value.Therefore, compared with the prior art, little with the difference of caloric value and temperature under same voltage of each electric heating element in a collection of product, some product Yin Wendu neither can occur and cross low and poor heating, it is too high and the problem of crackle and delamination occurs some product Yin Wendu also can not occur.The utility model can be applicable to electric heating and electric ignition, and its advantage is that heating is fast, temperature is high, the life-span is long.Product quality is improved, and waste product is few, the qualification rate height, and cost significantly reduces.Inner sandwich layer can adopt the material different with the inner conducting layer formula rate, can further reduce cost.

Fig. 1 is a structure chart of the present utility model.Fig. 1 is described as follows: 1 is resistive layer, and 2 is relative insulating barrier, and 3 is inner conducting layer, and 4 is inner sandwich layer, and 5 is outer conducting layer, and 6 is intercommunicating pore, and 7 is electrode jack.

Of the present utility model one be used for diesel engine electric heating plug core embodiment in conjunction with the accompanying drawings 1 its structure is described and annexation as follows: inner sandwich layer 4 is positioned at the centre of glow plug core, inner conducting layer 3 is coated on outside the inner sandwich layer 4, insulating barrier 2 is coated on outside the inner conducting layer 3 relatively, and resistive layer 1 is coated on outside the relative insulating barrier 2.There is an intercommunicating pore 6 on top at relative insulating barrier 2, and resistive layer 1 is connected at these intercommunicating pore 6 places with inner conducting layer 3, to form conductive channel.Resistive layer 1 has upper and lower two sections, and the epimere diameter is less to be the ignition operation section, and the big appearance of hypomere diameter is the part of cone.Outer conducting layer 5 is coated on the outside of resistive layer 1 hypomere.Electrode jack 7 is positioned on the centerline axis of inner sandwich layer 4 hypomeres, is a blind hole that does not connect, and electrode inserts thus.

Claims

1. the five-layer structure full-ceramic electrically-heated body that outer conducting layer is arranged comprises resistive layer (1), relative insulating barrier (2) and electrode jack (7), it is characterized in that also comprising inner conducting layer (3), inner sandwich layer (4) and outer conducting layer (5); Inner sandwich layer (4) is positioned at the centre of electric heating element, and inner conducting layer (3) is coated on the outside of inner sandwich layer (4), and insulating barrier (2) is coated on the outside of inner conducting layer (3) relatively, and resistive layer (1) is coated on the outside of relative insulating barrier (2); Inner sandwich layer (4) all can conduct electricity with inner conducting layer (3); There is an intercommunicating pore (6) on top at relative insulating barrier (2), and resistive layer (1) is located to be connected at this intercommunicating pore (6) with inner conducting layer (3), to form conductive channel; Resistive layer (1) has upper and lower two sections, and the epimere diameter is less to be the heating work section, and big its appearance of hypomere diameter is the part of cone; Outer conducting layer (5) is coated on the outside of resistive layer (1) hypomere, is connected with the electric heating element metal shell of conduction; Electrode jack (7) is positioned on the centerline axis of inner sandwich layer (4), is a blind hole that does not connect, and electrode inserts thus.