CN2557937Y

CN2557937Y - Temp. alarm sensor assembly

Info

Publication number: CN2557937Y
Application number: CN 02266491
Authority: CN
Inventors: 归绍文
Original assignee: CIXI SANXIN CAR COMPONENT AND PARTS Co Ltd
Current assignee: CIXI SANXIN CAR COMPONENT AND PARTS Co Ltd
Priority date: 2002-08-20
Filing date: 2002-08-20
Publication date: 2003-06-25
Anticipated expiration: 2012-08-20

Abstract

Disclosed is a temperature alarming sensor assembly, comprising a tongue tube, a thermistor, a thermally sensitive ferrite arranged outside the tongue tube and a peripheral shell. The utility model is characterized in that a current-limiting resistance is arranged inside the shell; one end of the current-limiting resistance is connected with the tongue tube, and the other end of the current-limiting resistance and one end of the thermistor are welded on the shell to be used as gnd ends; a flexible magnetic ring of the thermally sensitive ferrite and a hard magnetic ring are nested on the single side of the tongue tube; and heat conducting glue is filled inside the shell. The utility model integrates a tongue tube switch singly acted by the usual opening of the thermistor , the thermistor and the current-limiting resistance, all of which form the temperature sensor assembly. With simple structure, convenient manufacturing, low cost and stable and reliable performances, the utility model solves the problem that the bulb is burnt out, and can prevent the tongue tube from contacting particularly after the current-limiting resistance is connected into.

Description

The temperature warning sensor assembly

[affiliated technical field]

The utility model belongs to a kind of temperature sensor, relates in particular to a kind of thermometric of automobile engine cooling water and automobile-used temperature warning sensor of warning of being applied to.

[background technology]

At present, the temperature warning sensor that is used for automobile engine cooling water mainly contains two classes, and its linear temperature is measured and all adopted thermistor technology.Its difference mainly is the part of reporting to the police, and wherein a class is mainly utilized bimetallic strip to vary with temperature and produced distortion and realize reporting to the police.This is a kind of traditional method, and shortcoming is to adjust relatively difficulty, and stability, reliability and repeatable accuracy are poor slightly.The another kind of Curie's characteristic of then utilizing heat sensitive ferrite and tongue tube are formed the temperature alarming system, and its structure mainly is made of a pair of Hard Magnetic ring of suit on the tongue tube and a pair of soft magnetism ring of chuck and a copper sheet.This sensor construction complexity, cost are higher, and volume is also bigger, and particularly there is short disadvantage in serviceable life in reed contact.

[summary of the invention]

Have heat sensitive ferrite class temperature warning sensor complex structure, cost height now for solving, the deficiency that volume is big and serviceable life is short, the utility model provides a kind of temperature warning sensor assembly of novel structure.

The technical scheme that its technical matters that solves the utility model adopts is:

This temperature warning sensor assembly, comprise tongue tube, thermistor, and place the heat sensitive ferrite of tongue tube outside, peripheral housing again, its special feature is: housing is built-in with a current-limiting resistance, one end and tongue tube link, one end of the other end and thermistor is welded on the shell jointly, as the bonding end.Owing to use osram lamp on the automobile usually as attention display; the resistance of osram lamp is in the moment of switch connection; to there be very big dash current (5-10 steady current doubly) to flow through reed contact, and adopt current-limiting resistance to solve and burn out bulb and the problem of protecting reed switch contact.

Heat sensitive ferrite soft magnetism ring and Hard Magnetic ring set are put one-sided at tongue tube;

Be perfused with heat-conducting glue in the housing.

The connecting line of thermistor terminals, alarm switch terminals joins with external devices after scurrying overstocked sealing-in line end button again.

Beneficial effect: it is integrated temperature-sensitive open type single-acting dry-reed tube switch, thermistor, current-limiting resistance etc. in a metal shell; constituted the temperature sensor assembly; simple in structure, easy to make; with low cost; stable and reliable for performance, particularly insert and solved the problem that burns out bulb and protection reed switch contact behind the current-limiting resistance.

[description of drawings]

Accompanying drawing is the vertical section structure synoptic diagram of an embodiment of the utility model.

[embodiment]

The utility model is described in further detail by embodiment below in conjunction with accompanying drawing.

Referring to accompanying drawing.Be an one-sided heat sensitive ferrite soft magnetism ring 8 and Hard Magnetic ring 9 of being with of reed pipe 2, soft magnetism ring 8 in the inner part, Hard Magnetic ring 9 is in the outer part.After the soft or hard magnet ring put, a suitable location, interval, the principle of location was; Below Curie point TC, the contact of tongue tube 2 is not magnetized, and makes tongue tube be in normally open.When temperature was higher than Curie point TC, heat sensitive ferrite soft magnetism ring can lose magnetism sharp, thereby caused the route diversion of system's magnetic line of force, and tongue tube 2 is influenced by this, and the contact is magnetized, and normally open can stable immediately normally off, reaches the warning purpose.

Owing to use osram lamp as attention display on the automobile usually, the resistance of osram lamp will have very big dash current (5-10 steady current doubly) to flow through reed contact, and influence its contact endurance in the moment of switch connection.Adopt current-limiting resistance 1 to solve this problem, its method of attachment is that an end and tongue tube 2 link, and an end of the other end and thermistor 7 is welded on the shell 3 jointly, as the bonding end.Thermistor 7 varies with temperature its resistance also corresponding linear change can take place, thermistor terminals 5 jointing temp instrument.The other end of tongue tube 2 is alarm switch terminals 4 warning lamps of being informed of a case.The perfusion heat-conducting glue plays the effect of heat conduction and fixed sturcture in the housing 3.Establish the infiltration that the ramp 6 that adds O-ring seal can effectively prevent moisture content at shell 3 right-hand members, prevent the sensor internal short circuit.

The utility model temperature alarm assembly except the application on the automobile, can also be applied to other a plurality of fields.

Claims

1. temperature warning sensor assembly, its structure comprises tongue tube (2), thermistor (7), and the heat sensitive ferrite, the shell (3) that place tongue tube (2) outside, it is characterized in that: shell (3) is built-in with a current-limiting resistance (1), one end and tongue tube (2) link, one end of the other end and thermistor (7) is welded on the shell (3), as the bonding end jointly.

2. a kind of temperature warning sensor assembly as claimed in claim 1 is characterized in that: a heat sensitive ferrite soft magnetism ring (8) and a Hard Magnetic ring (9) are nested with one-sided at tongue tube (2).

3. a kind of temperature warning sensor assembly as claimed in claim 1 is characterized in that: shell is perfused with heat-conducting glue in (3).

4. a kind of temperature warning sensor assembly as claimed in claim 1 is characterized in that: after the connecting line of thermistor terminals (5), alarm switch terminals (4) is scurried overstocked sealing-in line end button (6), join with external devices again.