CN201037793Y

CN201037793Y - Line-type temperature-sensing detector with PTC and NTC characteristic

Info

Publication number: CN201037793Y
Application number: CNU2007200119374U
Authority: CN
Inventors: 张陈
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-04-30
Filing date: 2007-04-30
Publication date: 2008-03-19
Anticipated expiration: 2017-04-30

Abstract

The utility model relates to a linetype temperature inductor with PTC and NTC characteristics, consisting of a closed signal collection circuit formed by respectively connecting both ends of a temperature sensing cable with a microcomputer modulator(4) and a terminal resistor R. The utility model is characterized in structure of the temperature sensing cable which adopts two metal conductors(1). One metal conductor(1) is wrapped with PTC and NTC characteristic material barrier layer, and then arranged in parallel to, or twisted or wound with the other metal conductor(1) with a preferential clearance between two twisting or winding sections ranging from 20mm to 200mm, and finally extruded or covered by an external sheath(3). When the barrier layer with PTC and NTC characteristics is below the maximum permitted environmental temperature of the temperature sensing cable, the barrier layer presents PTC(positive temperature coefficient), and when heating temperature of the temperature sensing cable exceeds the maximum permitted environmental temperature, NTC(negative temperature coefficient) of the barrier layer is shown, thus playing a double role and overcoming the defect of traditional analog linetype temperature sensing cable that alarm temperature precision is affected by length of the cable and environmental temperature.

Description

A kind of line-type heat detector with PTC and NTC characteristic

Technical field

The utility model relates to the line-type heat detector of a kind of PTC of having and NTC characteristic.

Background technology

A kind of analog linear temperature-sensing detector, the construction of cable is the plastic packets coating that two conductors all coat NTC characteristic (negative temperature coefficient feature) outward, twist then to after extrusion molding restrictive coating together, temperature rises when being heated, NTC plastics resistance between the conductor reduces, the degree relevant with temperature (being that resistance value is measurable analog quantity) that resistance reduces, analog linear constant temperature or rate-of-rise and fixed temperature detector are to measure the absolute value or the pace of change of resistance, see Figure 12.The shortcoming of this detector is: behind the alarm temperature that detector is heated and temperature arrival is certain, detector can be reported a fire in advance, alarm temperature uses length relevant with the length of being heated with detector, the length of being heated is long more, the alarm temperature value is low more, promptly can not right judgement fire and alarm temperature, make the accuracy of this detector alarm temperature lower.Advantage: can recover, the back detector temperature of reporting to the police arrives the fire alarm temperature, but does not surpass the temperature of being burnt fully, and temperature reduces the back detector and still can work on.

Summary of the invention

The purpose of this utility model provides the line-type heat detector of a kind of PTC of having and NTC characteristic, realizes the multistage warning function of analog quantity constant temperature.

A kind of line-type heat detector with PTC and NTC characteristic, connect and compose the closed circuit signaling Acquisition Circuit with microcomputer modulator and terminal resistance respectively by the temperature sensing cable two ends, the structure that it is characterized in that temperature sensing cable: be provided with PTC and NTC characteristic material barrier layer between two metallic conductors, microcomputer modulator is monitored the PTC and the NTC characteristic material barrier layer of temperature sensing cable, and judges the multistage alerting signal of output according to temperature and the crossing setting value of change in resistance.

Compared with the prior art the design has following advantage:

Because the present invention has adopted the barrier layer with PTC and NTC characteristic on temperature sensing cable, when this barrier layer allows to use high ambient temperature following at temperature sensing cable, barrier layer shows as PTC (positive temperature coefficient (PTC)) characteristic, when the heating temperature of temperature sensing cable surpasses when allowing to use high ambient temperature, barrier layer NTC characteristic (the NTC characteristic is a negative temperature coefficient) shows, and sees Figure 13.The present invention has overcome traditional analog amount linear temperature sensitive cable influences the defective of alarm temperature precision because of using length and environment temperature.

Description of drawings

Fig. 1 is a kind of traditional on-off value linear temperature-sensitive detector structural representation;

Fig. 2, Fig. 4, Fig. 6, Fig. 8, Figure 10 are line-type heat detector example 1-example 5 cross-sectional view with PTC and NTC characteristic;

Fig. 3, Fig. 5, Fig. 7, Fig. 9, Figure 11 are line-type heat detector example 1-example 5 structural representations with PTC and NTC characteristic;

Embodiment

A kind of line-type heat detector with PTC and NTC characteristic, example 1 is seen Fig. 2 and Fig. 3, being connected to form the closed circuit signaling Acquisition Circuit with microcomputer modulator 4 and terminal resistance R respectively by the temperature sensing cable two ends constitutes, the structure that it is characterized in that temperature sensing cable: two metallic conductors 1, wherein a metallic conductor 1 coats PTC and NTC characteristic material barrier layer 2, parallel with another root metallic conductor 1 then along putting or stranded or be intertwined, pitch stranded or that twine is preferred between 20mm～200mm, and then extrusion molding or coating one deck external sheath layer 3.

2 one kinds of line-type heat detectors of embodiment with PTC and NTC characteristic, see Fig. 4 and Fig. 5, being connected to form the closed circuit signaling Acquisition Circuit with microcomputer modulator 4 and terminal resistance R respectively by the temperature sensing cable two ends constitutes, the structure that it is characterized in that temperature sensing cable: what it adopted is two metallic conductors 1, wherein a metallic conductor 1 coats PTC and NTC characteristic material barrier layer 2, parallel with another root metallic conductor 1 then along putting or stranded or be intertwined, pitch stranded or that twine is preferred between 20mm～200mm, coat plastic-aluminum or compound copper-plastics band or metal forming or conductive material or insulating bag belt 5 then, again extrusion molding or coating one deck external sheath layer 3.

3 one kinds of line-type heat detectors of embodiment with PTC and NTC characteristic, see Fig. 6 and Fig. 7, being connected to form the closed circuit signaling Acquisition Circuit with microcomputer modulator 4 and terminal resistance R respectively by the temperature sensing cable two ends constitutes, the structure that it is characterized in that temperature sensing cable: what it adopted is two metallic conductors 1, wherein a metallic conductor 1 coats PTC and NTC characteristic material barrier layer 2, coat plastic-aluminum or compound copper-plastics band or metal forming or conductive material or insulating bag belt 5 again, parallel with another root metallic conductor 1 then along putting or stranded or be intertwined, pitch stranded or that twine is preferred between 20mm～200mm, at last extrusion molding or coat one deck external sheath layer 3 again.

4 one kinds of line-type heat detectors of embodiment with PTC and NTC characteristic, see Fig. 8 and Fig. 9, being connected to form the closed circuit signaling Acquisition Circuit with microcomputer modulator 4 and terminal resistance R respectively by the temperature sensing cable two ends constitutes, the structure that it is characterized in that temperature sensing cable: what it adopted is that two metallic conductors 1 coat PTC and NTC characteristic material barrier layer 2 respectively, two line bodies that coat PTC and NTC characteristic material barrier layer 2 are can be parallel suitable to be put or stranded or be intertwined, pitch stranded or that twine is preferred between 20mm～200mm, and then extrusion molding or coating one deck external sheath layer 3.

5 one kinds of line-type heat detectors of embodiment with PTC and NTC characteristic, see Figure 10 and Figure 11, being connected to form the closed circuit signaling Acquisition Circuit with microcomputer modulator 4 and terminal resistance R respectively by the temperature sensing cable two ends constitutes, the structure that it is characterized in that temperature sensing cable: what it adopted is that two metallic conductors 1 coat PTC and NTC characteristic material barrier layer 2 respectively, coat plastic-aluminum or compound copper-plastics band or metal forming or conductive material or insulating bag belt 5 again, two metallic conductors that identical clad arranged 1 are parallel along putting or stranded or be intertwined then, pitch stranded or that twine is preferred between 20mm～200mm, at last extrusion molding or coat one deck external sheath layer 3 again.

The material of PTC that the present invention is used and NTC characteristic material barrier layer 2 can select for use butyl rubber, potassium base styrene-butadiene rubber and above-mentioned material by mixing conductive powder body or the semiconductor powder is made, and thickness is preferred between 0.01～3mm.

PTC and NTC characteristic tr pt A can be preferred between 40 ℃～100 ℃.

Claims

1. line-type heat detector with PTC and NTC characteristic, being connected to form the closed circuit signaling Acquisition Circuit with microcomputer modulator (4) and terminal resistance R respectively by the temperature sensing cable two ends constitutes, the structure that it is characterized in that temperature sensing cable: two metallic conductors (1) coat respectively or only wherein a metallic conductor (1) PTC and NTC characteristic material barrier layer (2) are arranged, the line body is parallel along putting or stranded or be intertwined, pitch stranded or that twine is preferred between 20mm～200mm, there are or do not have plastic-aluminum or compound copper-plastics band or metal forming or conductive material or insulating bag belt (5), at last extrusion molding or coat one deck external sheath layer (3) again.

2. a kind of line-type heat detector according to claim 1 with PTC and NTC characteristic, it is characterized in that two metallic conductors (1) coat PTC and NTC characteristic material barrier layer (2) respectively, coat plastic-aluminum or compound copper-plastics band or metal forming or conductive material or insulating bag belt (5) again, two metallic conductors (1) that identical clad arranged are parallel along putting or stranded or be intertwined then, at last extrusion molding or coat one deck external sheath layer (3) again.