CN100446045C - A non-recoverable linear temperature-sensitive detector and its circuit breaker alarm method - Google Patents

Abstract

A non-recoverable linear temperature-sensing detector and a circuit breaker alarm method thereof. The detector includes two linear temperature sensing elements A and B arranged in parallel, a terminal resistor connected to one end of the linear temperature sensing element A and B respectively, and a conversion box connected to the other end of the linear temperature sensing element A and B at the same time; The type temperature sensing element A is composed of two parallel detection conductors and the insulating layer between the detection conductors, and at least one of the detection conductors is a fusible conductor wire; the linear temperature sensing element B is composed of two parallel detection conductors. It is composed of a detection conductor and an NTC characteristic barrier layer arranged in parallel between the detection conductors. The non-recoverable linear temperature sensing detector and its open circuit alarm method of the present invention can respectively send out different alarm signals according to the open circuit fault or open circuit fire situation, so it can prevent the error caused by the open circuit fault of the linear temperature sensing element under normal temperature. alarm problems, thereby improving the alarm reliability of the detector.

Description

A non-recoverable linear temperature-sensitive detector and its circuit breaker alarm method

technical field

The invention relates to a non-recoverable linear temperature-sensing detector and a circuit breaker alarm method thereof, in particular to a non-recoverable linear temperature-sensing detector and a circuit breaker alarm method capable of preventing false alarms and thus having high reliability method.

Background technique

Linear temperature detector is a kind of fire detector widely used at present. It is mainly divided into recovery type and non-recoverable type. It usually consists of a linear temperature sensing element, a terminal resistor connected to one end of the The other end of the type temperature sensing element can detect the alarm electrical parameter (or sampling value) on the linear temperature sensing element in real time, and output the conversion of the fire alarm signal according to the size or change value of the alarm electrical parameter (or sampling value) box composition. Chinese invention patent application No. 200610126890.6 discloses a non-recoverable linear temperature detector proposed by the applicant of the present invention. FIG. 1 is a structural schematic diagram of the non-recoverable linear heat detector in the prior art. As shown in FIG. 1 , this non-recoverable linear temperature sensing detector in the prior art includes a linear temperature sensing element, a terminal resistor 5 and a conversion box 4 . The linear temperature sensing element is composed of two detection conductors 1, 2 arranged in parallel and an insulating layer 3 arranged in parallel between the detection conductors 1, 2, and the detection conductor 1 is a fusible conductor wire; the two detection conductors 1, One end of 2 is electrically connected to the input end of the conversion box 4 respectively, and a terminal resistor 5 is connected in series between the other ends. In the normal temperature range of -20°C to 45°C, the detection conductor 1 made of fusible conductor wire is a continuous conductor, which forms a conducting circuit with the detection conductor 2 and the terminal resistor 5 . When the linear temperature sensing element is locally heated and reaches the fusing temperature of the fusible conductor wire, the fusible conductor wire inside the heated part will start to melt, and under the action of its surface tension, the detection between the conductors 1, 2 and the terminal resistor 5 The formed circuit is permanently cut off. At this time, the conversion box 4 will immediately send out a fire alarm signal according to the magnitude or change value of the electrical parameter of the linear temperature sensing element, so as to achieve the purpose of fire alarm. The disconnection alarm method of this linear temperature sensing detector is that the conversion box 4 detects the alarm electric parameter (or sampled value) on the linear temperature sensing element in real time, once the "open circuit" state occurs on the linear temperature sensing element is detected , the conversion box 4 immediately sends out a fire alarm signal for breaking the circuit. However, there are the following problems in this non-recoverable linear temperature sensing detector and its disconnection alarm method: during the installation and use of the linear temperature sensing element, once it is subjected to excessive mechanical external force, it is easy to detect the conductor 1 There is an open circuit fault, but at this time the switch box 4 cannot send an open circuit fault alarm signal, but can only send an open circuit fire alarm signal, which will cause false alarms, so the reliability is relatively poor.

Contents of the invention

In order to solve the above-mentioned problems, the object of the present invention is to provide a non-recoverable linear temperature detector with high reliability, which can send different alarm signals according to the open circuit fault or open circuit fire situation, thereby preventing false alarms from occurring. Its circuit breaker alarm method.

In order to achieve the above object, the non-recoverable linear temperature sensing detector provided by the present invention includes two linear temperature sensing elements A and B arranged in parallel, respectively connected to the terminal resistance at one end of the linear temperature sensing element A and B, and simultaneously connected A conversion box at the other end of the line-type temperature sensing element A, B; wherein the line-type temperature sensing element A is composed of two detection conductors arranged in parallel and an insulating layer arranged in parallel between the detection conductors, and at least one of the detection conductors is The fusible conductor wire; the linear temperature sensing element B is composed of two detection conductors arranged in parallel and an NTC characteristic barrier layer arranged in parallel between the detection conductors.

The linear temperature sensing elements A and B can share one detection conductor.

One detection conductor in the linear temperature sensing element B is a thermocouple wire.

The disconnection alarm method of the non-recoverable linear temperature detector provided by the present invention includes the following steps in order:

(1) The conversion box detects the state of the linear temperature sensing element A and the resistance value, resistance value change rate, voltage value or voltage value change rate of the linear temperature sensing element B in real time;

(2) When the conversion box detects that the linear temperature sensing element A is in the "open circuit" state, but the resistance value, resistance value change rate, voltage value or voltage value change rate of the linear temperature sensing element B does not exceed one or both When the corresponding threshold is set, the stage of sending out the "open circuit" fault alarm signal;

(3) When the conversion box detects that the line-type temperature sensing element A is in the "open circuit" state, and the resistance value, resistance value change rate, voltage value or voltage value change rate of the line-type temperature sensing element B exceeds the corresponding one or both. When the threshold is set, the "open circuit" stage of the fire alarm signal is issued.

The thresholds mentioned above are all empirical values or obtained through experiments.

The non-recoverable linear temperature-sensing detector and its open circuit alarm method provided by the present invention can send out different alarm signals according to the open circuit fault or open circuit fire, so it can prevent the fault caused by the open circuit fault of the linear temperature sensing element under normal temperature. The problem of false alarms can be solved, so that the reliability of the fire alarm of the detector can be improved.

Description of drawings

Fig. 1 is a longitudinal partial structure sectional view of a linear temperature sensing element in a non-recoverable linear temperature sensing detector in the prior art.

Fig. 2 is a schematic structural diagram of an embodiment of a non-recoverable linear temperature-sensitive detector provided by the present invention.

Fig. 3 is a schematic structural diagram of another embodiment of the non-recoverable linear temperature-sensitive detector provided by the present invention.

Detailed ways

The following is a detailed description of the non-recoverable linear heat detector and its circuit breaker alarm method provided by the present invention with reference to the accompanying drawings and specific embodiments.

Example 1:

As shown in Figure 2, the non-recoverable linear temperature sensing detector provided by the present invention includes two linear temperature sensing elements A and B arranged in parallel, and terminal resistors 16 respectively connected to one end of the linear temperature sensing elements A and B, 17 and the conversion box 18 connected to the other end of the linear temperature sensing element A and B at the same time; wherein the linear temperature sensing element A consists of two parallel detection conductors 10,11 and the insulation between the detection conductors 10 and 11. Layer 15, and at least one of the detection conductors 10, 11 is a fusible conductor wire; the linear temperature sensing element B is composed of two parallel detection conductors 12, 13 and an NTC arranged in parallel between the detection conductors 12, 13 The characteristic barrier layer 14 is composed. The detection conductors 10 and 11, 12 and 13 can be arranged in parallel, winding or coaxial manner, while the linear temperature sensing elements A and B can be arranged in parallel or winding manner. The resistance values of the terminal resistors 16 and 17 range from 1KΩ to 20MΩ. The conversion box 18 is used for real-time detection of the state between the detection conductors 10, 11, the resistance value (sampled value) and the change rate of the resistance value between the detection conductors 12, 13. In addition, an outer sheath can also be provided outside the wire-type temperature sensing elements A and B.

Example 2:

As shown in Figure 3, this embodiment is an improvement on the basis of Embodiment 1: the two detection conductors 10 and 12 in Embodiment 1 are replaced by a detection conductor 19. At this time, the detection conductors 11, 19 and The insulating layer 15 forms the linear temperature sensing element A, while the detection conductors 13, 19 and the NTC characteristic barrier layer 14 form the linear temperature sensing element B, and other structures remain unchanged.

Example 3:

This embodiment is an improvement on the basis of Embodiments 1 and 2: any conductor in the detection conductor 12, 13 or 19 is replaced by a thermocouple wire, thereby forming a line type with thermocouple characteristics with another detection conductor The temperature sensing element B and the conversion box 18 are used to detect the state of the linear temperature sensing element A and the voltage (potential) value and voltage value change rate of the linear temperature sensing element B in real time, and other structures remain unchanged.

When the linear temperature sensing elements A and B in the non-recoverable linear temperature sensing detector provided by the present invention are heated and reach a certain temperature, since one of the two detection conductors 10 and 11 of the linear temperature sensing element A is Fusible conductor wire, so the temperature of the fusible conductor wire inside the heated part will rise accordingly. When the temperature reaches the fusing temperature of the fusible conductor wire, it will melt. Under the action of surface tension, the detection conductors 10, 11 and The circuit formed by the terminal resistor 16 is permanently cut off, that is, an open circuit occurs. At the same time, the resistance value, resistance value change rate, voltage value or voltage value change rate of the NTC characteristic barrier layer 14 in the linear temperature sensing element B will also occur. If it is connected to the linear temperature sensing element A at this time, the conversion box 18 at one end of B detects that the linear temperature sensing element A is in the "open circuit" state, but the resistance value, resistance value change rate, and voltage value of the linear temperature sensing element B Or one or both of the rate of change of the voltage value does not exceed the corresponding set threshold (these thresholds are all empirical values or obtained through experiments, and the electrical parameters of the linear temperature sensing element B are always within the normal ambient temperature. threshold, and when the temperature reaches the fire alarm temperature during the one-meter heat test, its resistance value, resistance value change rate, voltage value or voltage value change rate will exceed the corresponding threshold value), it will issue an "open circuit" fault Alarm signal; and if the conversion box 18 detects that the line-type temperature sensing element A is in the "open circuit" state, and the resistance value, resistance value change rate, voltage value or voltage value change rate of the line-type temperature sensing element B is one or At the same time, if the above-mentioned threshold value is exceeded, it indicates that a fire has really occurred, and it will send out a "circuit breaking" fire alarm signal, so as to achieve the purpose of fire alarm.

And when the linear temperature sensing elements A and B in the non-recoverable linear temperature sensor provided by the present invention are subjected to mechanical external force, the fusible conductor wire in the detection conductor 10, 11 or 10, 19 is disconnected , since the resistance value, resistance value change rate, voltage value or voltage value change rate change of the NTC characteristic barrier layer 14 in the linear temperature sensing element B is small, so the detection result of the conversion box 18 at this time is the linear temperature sensor Component A is in the "open circuit" state, but the resistance value, resistance value change rate, voltage value or voltage value change rate of the linear temperature sensing component B still do not exceed the corresponding set threshold, so it will issue an "open circuit" fault alarm signal .

Claims (5)

1, a kind of irrecoverable linear temperature-sensitive detector, it is characterized in that: described irrecoverable linear temperature-sensitive detector comprises two parallel linear temperature sensor A that are provided with, B, be connected to linear temperature sensor A, the terminal resistance (16 of B one end, 17) and simultaneously be connected linear temperature sensor A, the boxcar of the B other end (18); Wherein linear temperature sensor A is made up of two parallel detecting conductors (10,11) that are provided with and the parallel insulation courses (15) that are arranged between the detecting conductor (10,11), and in the detecting conductor (10,11) at least one be the conductor silk that easily fuses; Linear temperature sensor B is made up of two parallel detecting conductors (12,13) that are provided with and the parallel NTC characteristic barrier layer (14) that is arranged between the detecting conductor (12,13).

2, irrecoverable linear temperature-sensitive detector according to claim 1 is characterized in that: described linear temperature sensor A, B can a shared detecting conductor.

3, according to claim 1,2 described irrecoverable linear temperature-sensitive detectors, it is characterized in that: a detecting conductor among the described linear temperature sensor B is a thermocouple wire.

4, a kind of breaking alarming method of irrecoverable linear temperature-sensitive detector as claimed in claim 1 is characterized in that: the breaking alarming method of described irrecoverable linear temperature-sensitive detector comprises the following step that carries out in order:

(1) stage of in real time resistance value, resistance change rate, magnitude of voltage or the magnitude of voltage rate of change of the state of linear temperature sensor A and linear temperature sensor B being detected of boxcar;

(2) when detecting linear temperature sensor A, boxcar is in " opening circuit " state, but some or when not exceeding simultaneously corresponding setting threshold in the resistance value of linear temperature sensor B, resistance change rate, magnitude of voltage or the magnitude of voltage rate of change, the stage of sending " opening circuit " failure alarm signal;

(3) when detecting linear temperature sensor A, boxcar is in " opening circuit " state, and some or when exceeding corresponding setting threshold simultaneously in the resistance value of linear temperature sensor B, resistance change rate, magnitude of voltage or the magnitude of voltage rate of change, the stage of sending " opening circuit " fire alarm signal.

5, the breaking alarming method of irrecoverable linear temperature-sensitive detector according to claim 4 is characterized in that: described threshold value is empirical value or obtains by experiment.

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