CN202916947U - Linear temperature sensing detector capable of detecting faults of parallel-connection bimetal temperature switches - Google Patents
Linear temperature sensing detector capable of detecting faults of parallel-connection bimetal temperature switches Download PDFInfo
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- CN202916947U CN202916947U CN 201220629694 CN201220629694U CN202916947U CN 202916947 U CN202916947 U CN 202916947U CN 201220629694 CN201220629694 CN 201220629694 CN 201220629694 U CN201220629694 U CN 201220629694U CN 202916947 U CN202916947 U CN 202916947U
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- temperature switch
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Abstract
A linear temperature sensing detector capable of detecting faults of parallel-connection bimetal temperature switches includes a microcomputer modulator. A plurality of bimetal temperature switches are connected in parallel between two parallel conductors so as to form a temperature-sensing cable. The linear temperature sensing detector is characterized in that after each bimetal temperature switch is connected in series with a thermistor, another resistor is connected in parallel with each thermistor and each bimetal temperature switch which have been connected in series; and then, respective ends of each bimetal temperature switch and each thermistor are connected in parallel with the parallel conductors; an insulating sheath is wrapped at the exterior of the two conductors; and the conductors of the temperature-sensing cable are connected with the microcomputer modulator so as to form a signal acquisition circuit. Normally-open-type switches of which action temperature is in a range of 60 DEG C to 180 DEG C are selected as the bimetal temperature switches in the utility model. The linear temperature sensing detector is advantageous in that the microcomputer modulator can both judge a situation where the switching on and conduction of the bimetal temperature switches are caused by a mechanical external force and a situation of the dropping of the bimetal temperature switches, and sends out fault alarm signals.
Description
Technical field
The utility model and fire alarm installation, a kind of line-type heat detector that detects the parallel connection double metal temperature switch fault.
Background technology
Parallel connection double metal temperature switch analog linear temperature-sensing fire detecting cable of the prior art referring to Fig. 1, is comprised of a plurality of double metal temperature switch 12 that are connected in parallel between two detecting conductors 10,11.Its normal operating conditions is: when being heated for a certain section that surveys cable, rising with temperature, the closed conducting of double metal temperature switch in this section causes the resistance between the detector conductor to descend, and microcomputer modulator is according to resistance decline judgement and send fire alarm signal.The critical defect of this detection cable is: parallel connection double metal temperature switch is easy to because mechanical external force causes the switch closure conducting, sends equally the mistake fire alarm signal; Perhaps more tight person of outstanding talent's is that parallel connection double metal temperature switch can not send failure alarm signal because coming off.The detector reliability of this structure is low, the very easy wrong report by mistake.For this reason, need to propose the higher line-type heat detector of a kind of reliability.
Summary of the invention
The purpose of this utility model is to provide a kind of line-type heat detector that detects the parallel connection double metal temperature switch fault, has distinguish to judge that the double metal temperature switch action is because mechanical external force causes false alarm that the switch closure conducting causes or causes the function of fault alarm owing to double metal temperature switch comes off.
A kind of line-type heat detector that detects the parallel connection double metal temperature switch fault of the utility model, comprise microcomputer modulator, temperature sensing cable is a plurality of double metal temperature switch in parallel between two parallel conductors, it is characterized in that: behind the double metal temperature switch series thermal-sensitive resistance, again that another resistance is in parallel with connect rear thermistor and double metal temperature switch, then double metal temperature switch and thermistor are held in parallel with parallel conductor separately, its outer wrapping insulating sheath, conductor and the microcomputer modulator of temperature sensing cable are connected to form signal acquisition circuit.
Compared with the prior art, the advantage that a kind of line-type heat detector that detects the parallel connection double metal temperature switch fault of the utility model has is: double metal temperature switch is because mechanical external force causes switch closure conducting and double metal temperature switch to come off, and microcomputer modulator all can be judged the concurrent alerting signal that is out of order.
Description of drawings
Fig. 1 is existing parallel connection double metal temperature switch linear temperature-sensing detector structural representation;
A kind of structural representation that detects the line-type heat detector of parallel connection double metal temperature switch fault of Fig. 2 the utility model.
Embodiment
A kind of line-type heat detector that detects the parallel connection double metal temperature switch fault of the utility model, embodiment 1 sees Fig. 2, conductor 1 by temperature sensing cable is connected to form signal acquisition circuit with microcomputer modulator 6, the structure of temperature sensing cable adopts two parallel conductors 1 and has a determining deviation, a plurality of double metal temperature switch in parallel, it is characterized in that: double metal temperature switch 2 one ends series connection NTC performance thermistor 4, again with resistance 3 with connect after double metal temperature switch 2 and 4 parallel connections of NTC performance thermistor, then double metal temperature switch 2 and NTC performance thermistor 4 hold separately in parallel with parallel conductor 1, its outer wrapping insulating sheath 5.The operating temperature of the double metal temperature switch open in usual 2 that operating temperature is identical is to select between 60 ℃～180 ℃.
In the present embodiment, described two strip conductors 1 can be that welding or machinery cooperate pressing to be connected with double metal temperature switch 2, resistance 3 and thermistor 4, and the interval of its double metal temperature switch that is set up in parallel 2 can be designed to every meter 1～10.Two strip conductors 1 after the assembling keep the parallel extrusion molding of a determining deviation to be coated in the insulating sheath 5.
When temperature sensing cable when allowing to use high ambient temperature following, resistance is in invariant state all the time between two conductors 1, microcomputer modulator 6 can't detect change in resistance, when the temperature sensing cable heating temperature surpasses the operating temperature of double metal temperature switch 2, double metal temperature switch 2 action conductings, because double metal temperature switch 2 series connection NTC performance thermistors 4, after double metal temperature switch 2 actions, the resistance following temperature rising high value of the thermistor 4 of series connection reduces, and microcomputer modulator 6 reduces according to resistance between two strip conductors 1 to be judged and the output fire alarm signal.When the action conducting of double metal temperature switch 2, the resistance of series connection NTC performance thermistor 4 does not reduce, and microcomputer modulator 6 is judged the concurrent alerting signal that is out of order.When double metal temperature switch 2 and resistance 3 come off simultaneously, resistance can raise between two conductors 1, and microcomputer modulator 6 raises according to the resistance between two conductors 1, judges the concurrent alerting signal that is out of order.
The NTC performance thermistor 4 of above-described embodiment 1 also can be the ptc characteristics thermistor.
Claims (1)
1. line-type heat detector that can detect the parallel connection double metal temperature switch fault, comprise microcomputer modulator, temperature sensing cable is a plurality of double metal temperature switch in parallel between two parallel conductors, it is characterized in that: behind double metal temperature switch (2) the series thermal-sensitive resistance (4), again with another resistance (3) with connect after thermistor (4) and double metal temperature switch (2) parallel connection, then double metal temperature switch (2) and thermistor (4) are held in parallel with parallel conductor (1) separately, its outer wrapping insulating sheath (5), the conductor of temperature sensing cable (1) is connected to form signal acquisition circuit with microcomputer modulator (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220629694 CN202916947U (en) | 2012-11-23 | 2012-11-23 | Linear temperature sensing detector capable of detecting faults of parallel-connection bimetal temperature switches |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220629694 CN202916947U (en) | 2012-11-23 | 2012-11-23 | Linear temperature sensing detector capable of detecting faults of parallel-connection bimetal temperature switches |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202916947U true CN202916947U (en) | 2013-05-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220629694 Expired - Lifetime CN202916947U (en) | 2012-11-23 | 2012-11-23 | Linear temperature sensing detector capable of detecting faults of parallel-connection bimetal temperature switches |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202916947U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107390122A (en) * | 2017-07-28 | 2017-11-24 | 宝应电器厂 | A kind of computer auto-detection system of thermal protector temperature parameter |
| US11212905B2 (en) * | 2018-11-30 | 2021-12-28 | Yokogawa Electric Corporation | Field device capable of operating in extremely low-temperature environment |
-
2012
- 2012-11-23 CN CN 201220629694 patent/CN202916947U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107390122A (en) * | 2017-07-28 | 2017-11-24 | 宝应电器厂 | A kind of computer auto-detection system of thermal protector temperature parameter |
| US11212905B2 (en) * | 2018-11-30 | 2021-12-28 | Yokogawa Electric Corporation | Field device capable of operating in extremely low-temperature environment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130501 |