WO2008031310A1

WO2008031310A1 - A nonrenewable linear temperature-sensing fire detector for alarm with open circuit

Info

Publication number: WO2008031310A1
Application number: PCT/CN2007/001574
Authority: WO
Inventors: Weishe Zhang; Gangjin Li
Original assignee: Weishe Zhang; Gangjin Li
Priority date: 2006-09-08
Filing date: 2007-05-15
Publication date: 2008-03-20
Also published as: CN200956191Y

Abstract

A nonrenewable linear temperature-sensing fire detector for alarm with open circuit includes two detecting conductors, an insulation layer and a conversion box. Said two detecting conductors are arranged in parallel. At least one of said two detecting conductors is fusible conductor. The isolation layer is arranged between said two detecting conductors. The head ends of said two detecting conductors are electrically connected with the conversion box. A resistor is connected in series with the tail ends of said two detecting conductors. The fusion temperature range of said fusible conductor is 45?~280?.

Description

Non-recoverable linear temperature sensing fire detector with open circuit alarm

Technical field

The utility model relates to an unrecoverable linear temperature sensing fire detector with an open circuit alarm. At least one of the detecting conductors of the linear type temperature detecting fire detector adopts a fusible conductor, and uses the principle of "breaking" to report a fire alarm or an auxiliary fire alarm.

Background technique

The conventional non-recoverable linear temperature fire detector currently used is a widely used fire detector, and FIG. 1 and FIG. 2 show the structure of the existing non-recoverable line type heat detector. In the detector, there is an outer sheath 1 in which two (or three, four) elastic conductors 3 are twisted together, and the outer surface of the detecting conductor is covered with a meltable material 2 of a certain melting point. When the detecting cable is heated, the temperature can reach a certain degree, and then melt soften or melt. Under the elastic force of the elastic conductor, the detecting conductors are in contact with each other, that is, a short circuit occurs, thereby achieving the purpose of fire alarm. After the probe conductor is broken, the detector reports a fault. The advantages of this type of detector are: When the temperature of any point on the detection cable reaches the set alarm temperature, the detection cable can be short-circuited. The sensitivity of the detector alarm is independent of the length of the heat. Therefore, local overheating of the protected object occurs. The detection sensitivity of fires caused by external fire sources is very high. The disadvantage is that the elastic conductor or the memory alloy wire in the temperature detector is in the environment of the alarm temperature under normal conditions, or is subjected to mechanical external force during installation and use, and the short circuit between the probe conductors is prone to occur. This caused a false alarm fire. In order to substantially distinguish between the two types of fire alarms and "short circuit" of the existing detectors, combined with the existing non-recoverable linear temperature fire detectors, an irreversible linear temperature fire with an open circuit alarm is proposed. detector.

Summary of the invention

The purpose of the utility model is to provide an unrecoverable line type temperature sensitive fire detector with an open circuit alarm, wherein at least one of the detecting elements of the line type temperature sensing fire detector uses a fusible conductor, and the design of the fusing temperature thereof The value can be set within a range of 45 Ό to 280 ,. When the ambient temperature of the protected object exceeds this design value, the heated portion of the fusible conductor melts, and under the surface tension, the circuit formed by the detecting conductor is permanently cut off. The fire detector sends an alarm signal according to the "open circuit" status.

The object of the utility model is achieved by the following technical solutions: an unrecoverable linear temperature sensing fire detector with an open circuit alarm, comprising two detecting conductors, an insulating layer and a conversion box, wherein the two detecting conductors are in parallel The at least one detecting conductor of the detecting conductor is a fusible conductor, and the insulating layer is disposed between the two detecting conductors, and the first ends of the two detecting conductors are respectively electrically connected to the input end of the converter box. A resistor is connected in series between the two detecting conductors, and the resistor is connected in series at the tail ends of the two detecting conductors, and the fusible conductor has a fusing temperature ranging from 45 ° C to 280 ° C. The object of the present invention can also be achieved by the following technical solutions: an unrecoverable line type temperature sensitive fire detector with an open circuit alarm, comprising a detecting conductor, an insulating layer, a conversion box, and a pair of said detecting conductors arranged in parallel Detecting the cable A, the other pair of the detector conductors disposed in parallel constitute the probe cable B, and the probe cable A and the probe cable B are arranged in parallel to form a composite probe cable; At least one of the detecting conductors is a fusible conductor, and the insulating layer is disposed between the two detecting conductors, and the first ends of the two detecting conductors are respectively electrically connected to the input end of the converter box, and the two detecting conductors are respectively There is a resistor connected in series, the resistor is connected in series at the tail end of the two detecting conductors, and the fusible conductor has a fusing temperature range of 45O~28 (TC; two detecting conductors in the detecting cable B) The first end is electrically connected to the input end of the converter box respectively, and a resistor is connected in series between the two detecting conductors, the resistor is connected in series at the tail end of the two detecting conductors, and the two detecting conductors are fusible Absolutely Edge layer.

The object of the present invention can also be achieved by another technical solution: an unrecoverable line type temperature sensitive fire detector with an open circuit alarm, comprising a detecting conductor, an insulating layer, a conversion box, and a pair of parallel detecting probes for detecting a cable A; at least one of the detecting conductors A is a fusible conductor, and the insulating layer is disposed between the two detecting conductors, and the first ends of the two detecting conductors are respectively input to the converter box Electrically connected, a resistor is connected in series between the two detecting conductors, the resistor is connected in series at the tail ends of the two detecting conductors, and the fusible conductor has a fusing temperature range of 45 t~280; One of the detecting conductors of the cable A is disposed as a common conductor, and another detecting conductor of equal length and matching is disposed in parallel with the common conductor, and a fusible insulating layer is disposed between the detecting conductor and the common conductor to form a detecting cable. B; the probe cable A and the probe cable B constitute a composite probe cable; the first end of one of the probe cables B and the switch box input Electrically connecting the detection conductor to detect a cable B is shared between the conductor and a series resistor, the series resistor at the end of the detection conductors and the common conductor.

Compared with the prior art, the utility model has the following advantages:

1. Since the utility model adopts a fusible conductor as a detecting conductor, the transmission performance of the fusible conductor is good at a normal temperature, and once it exceeds the melting temperature value, the detecting cable is "opened" under the action of the tension, and the sense is The warm fire detector emits a fire alarm signal according to the "open circuit" state.

2. Because the utility model organically combines the functions of "open circuit" alarm and "short circuit" alarm, the false alarm under normal temperature can be effectively reduced, and the non-recoverable linear heat detector is added. Online detection of "short circuit" alarm faults.

DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Figure 1. Schematic diagram of the existing non-recoverable linear heat detector Figure 2. Cross-sectional view of the existing non-recoverable linear temperature fire detector (cross-sectional view of Figure 1) Figure 3. Schematic diagram of the linear temperature fire detector of the present invention

Figure 4. Cross-sectional view of the linear temperature fire detector of the present invention (cross-sectional view of Figure 3)

Figure 5 is a schematic view showing the structure of the second embodiment of the present invention

Figure 6. Cross-sectional view of the second embodiment of the present invention (cross-sectional view of Figure 5.) Figure 7. Schematic diagram of the third embodiment of the present invention

Figure 8. Cross-sectional view of the third embodiment of the present invention (cross-sectional view of Figure 7) Figure 9. Schematic diagram of the fourth embodiment of the present invention

Figure 10 is a cross-sectional view of the fourth embodiment of the present invention (cross-sectional view of Figure 9)

detailed description

Referring to FIG. 3 and FIG. 4, the line type temperature-sensing fire detector of the present invention belongs to a non-recoverable line type temperature-sensing fire detector of an open circuit alarm, and includes two detecting conductors, an insulating layer 5, and a conversion box 8. The two detecting conductors 6, 7 are arranged in parallel, one of the detecting conductors is a fusible conductor, and an insulating layer is disposed between the two detecting conductors, and the head ends of the two detecting conductors are respectively The input end of the converter box is electrically connected, and a resistor 4 is connected in series between the two detecting conductors, and the resistor is connected in series at the tail end of the two detecting conductors (connected according to a conventional connection standard), and the resistance of the resistor is 0~20Μ Ω, the optimum value is between 1Κ Ω~1Μ Ω, (when the resistance value is 0, the resistor can be canceled). In the present embodiment, the detecting conductor 6 is a fusible conductor, and the fusible conductor has a fusing temperature range of 45° (: 〜 280 ° C. The fusible conductor may be a fusible alloy wire or an organic The conductive plastic wire may also be composed of a plurality of conductors connected end to end in sequence, and all the connection points in the fusible conductor are welded using a fusible alloy solder. In the present embodiment, a fusible alloy wire is used as a fusible conductor. The fusible alloy wire and the fusible alloy solder are all conventional products on the market. The parallel arrangement of the detecting conductors means that the detecting conductors 6, 7 are spirally twisted (wound) together, or one is wound around another. One detecting cable is formed on one of the above. The detecting conductors 6, 7 can also be arranged together by a coaxial structure or by a parallel structure. The conversion box can also be called an electrical signal measuring device, which belongs to the conventional technology. , for measuring the resistance change and the open circuit between the two detecting conductors.

In the conventional temperature range, the fusible conductor is a continuous conductor, and the fusible conductor 6 forms a conduction circuit with the detecting conductor 7 and the resistor. The conventional temperature range designed in this embodiment is - 20 Γ 45Γ, when the linear type heat detector of the present invention is heated, the temperature of the fusible conductor rises. When the temperature reaches the melting temperature of the fusible conductor 6 and above, the heated portion melts under the surface tension. The circuit formed by the detecting conductor is permanently cut off, and the "breaking" condition between the detecting conductors 6, 7 is detected by the conversion box of the linear type thermal fire detector to perform a fire alarm and lose Fire alarm signal.

In the present embodiment, the manner in which the insulating layer is disposed between the two detecting conductors may be the structure shown in Fig. 4, or a conventional structure may be employed, that is, each of the detecting conductors is respectively covered with an insulating layer.

Referring to FIG. 5 and FIG. 6 , embodiment 2 of the present invention is an improvement on the basis of the first embodiment. In order to further improve the protection performance, an insulating sheath 9 is additionally coated on the outside of the two detecting conductors, and the insulating layer is insulated. The jacket is used to insulate from the outside. In this embodiment, the two probe conductors can also be wound together in a helically twisted manner with a winding pitch of less than 1500 mm (not shown). The length of the probe conductor can be 'designed from 50 meters to 200 meters.

Referring to FIG. 7 and FIG. 8, a third embodiment of the present invention is an improvement on the basis of the first embodiment. The embodiment includes a detecting conductor, an insulating layer, a conversion box, and a pair of detecting conductors arranged in parallel. 12, 13 constitute a probe cable A, and another pair of probe conductors 10, 11 arranged in parallel constitute a probe cable B, and the probe cable A and the probe cable B are arranged in parallel to form a composite probe cable. The detecting conductor 12 in the detecting cable A is a fusible conductor, and the insulating layer 14 is disposed between the two detecting conductors, and the first ends of the two detecting conductors are respectively electrically connected to the input end of the converter box 18, A resistor 17 is connected in series between the two detecting conductors, and the resistor is connected in series at the tail end of the two detecting conductors, and the fusible conductor has a fusing temperature range of 45 ° C to 28 (TC. The first ends of the two detecting conductors in the cable B are respectively electrically connected to the input end of the converter box 18, and a resistor 16 is connected in series between the two detecting conductors, and the resistor is connected in series at the tail of the two detecting conductors. The fusible insulating layer 15 is disposed between the two detecting conductors, and the fusible insulating layer (also referred to as a meltable insulating layer) may be coated with wax, naphthoquinone, stearic acid, crystal rose, PE plastic. One of the PVC plastics, the thickness of the fusible insulating layer can be selected between 0. 1-2 mm. The conversion box is used to detect the "open circuit" or "circuit" of the two circuits of the detecting cable A and the detecting cable B. Short circuit" situation. When a fire occurs, the linear temperature sensing cable generates a fire. When the temperature is heated, the temperature rises accordingly. When the temperature does not reach the softening temperature region of the fusible insulating layer, the resistance between the two detecting conductors is constant; when the heated temperature continues to rise, the softening temperature of the fusible insulating layer is reached. In the region, the fusible insulating layer is melted (or softened), and under the elastic force between the two detecting conductors, the detecting conductors 10, 11 in the detecting cable B are "short-circuited" (this is the working principle of the prior art, not Detailed description) Meanwhile, when the heating temperature is higher than the operating temperature of the detecting cable A, that is, when the temperature reaches the melting temperature of the detecting conductor 12 and above, the heated portion is melted, and under the surface tension, the detecting conductors 12, 13 and The circuit formed by the resistor 17 is permanently cut off, and the "break" condition between the probe conductors 12, 13 is detected by the converter box 18 of the line type thermal fire detector to be logically related to the "short circuit" signal of the probe cable B. "After the fire alarm and output of the fire alarm signal. When the line type temperature sensing cable is damaged by mechanical external force or human factors, the detection cable A and the detection cable B may The event of a "short" or simultaneous "break" In the case, it is also possible to detect a "short circuit" or "open circuit" condition of one of the cables A and B. At this time, the line type temperature-sensing fire detecting detector reports only the fault through the switch box, and does not report the fire. In the present embodiment, the fusible conductor for the detecting conductor 12 may be one of a fusible alloy conductive wire, a wire formed by welding a fusible alloy in sections, and an organic conductive plastic. The wire formed by welding the fusible alloy means that the fusible conductor is composed of a plurality of conductors connected end to end, and all the connection points in the fusible conductor are welded by fusible alloy solder, the fusible alloy The design of the fusing temperature is 45 Ό to 280 °C.

In this embodiment, the manner in which the insulating layer or the fusible insulating layer is disposed between the two detecting conductors may be the structure shown in FIG. 8, or a conventional structure may be adopted, that is, each detecting conductor is respectively covered with an insulating layer or may be Melt the insulation layer. The detection cable A and the detection cable B may be arranged in the same manner as shown in FIG. 8, or may be stacked one on another, or one of the conventional methods. In this embodiment, an outer sheath may be coated on the outside of the detecting cable A and the detecting cable B, which is not shown in the drawing.

Referring to Fig. 9 and Fig. 10, the detector of the fourth embodiment of the present invention is an improvement on the basis of the third embodiment, and can also be regarded as a modified product of the third embodiment. In this embodiment, a pair of probe conductors disposed in parallel constitutes the probe cable A; one of the probe conductors 19 is a fusible conductor, and the insulating layer 14 is disposed between the two probe conductors 19, 20. The first ends of the two detecting conductors are respectively electrically connected to the input end of the converter box 18, and a resistor 17 is connected in series between the two detecting conductors, and the resistor is connected in series at the tail end of the two detecting conductors. The fusing conductor has a fusing temperature range of 45'C to 28 (TC; one of the detecting conductors 20 in the detecting cable A is set as a common conductor, and another detecting conductor 21 of the same length and matching is arranged in parallel with the common conductor. a fusible insulating layer 15 (also referred to as a fused insulating layer) is disposed between the detecting conductor and the common conductor to form a detecting cable B; the detecting cable A and the detecting cable B constitute a composite detecting cable The first end of one of the detecting conductors B is electrically connected to the input end of the converter box, and a resistor 16 is connected in series between the detecting conductor 21 and the common conductor 20, the resistor string Connected in said The trailing ends of the detecting conductor and the common conductor. At least one of the detecting conductor 20 and the detecting conductor 21 is an elastic conductor or a memory alloy wire.

In the present invention, the insulating layer or the fusible insulating layer is disposed between the two detecting conductors in the manner shown in FIG. 10, or the conventional structure may be used, that is, each detecting conductor is respectively covered with an insulating layer or may be Melt the insulation layer. The fusible conductive wire may be a continuous fusible alloy conductive wire; or may be a length of 0. 2~1 m of multi-section wire welded with a fusible alloy; or may be a meltable organic conductive plastic The wire, the organic conductive plastic wire can be melted in the range of 40 to 200 °C.

Claims

Rights request

A non-recoverable linear temperature-sensing fire detector for an open circuit alarm, comprising two detecting conductors, an insulating layer, and a conversion box, wherein: the two detecting conductors are arranged in parallel, and at least one of the detecting conductors The root detecting conductor is a fusible conductor, and the insulating layer is disposed between the two detecting conductors, and the first ends of the two detecting conductors are respectively electrically connected to the input end of the converter box, and the two detecting conductors are connected Connected to a resistor, the resistor is connected in series with the tail ends of the two detecting conductors, and the fusible conductor has a fusing temperature range of 45 ° C to 280 ° C.

2. The line type temperature sensitive fire detector according to claim 1, wherein: said fusible conductor is a fusible alloy wire.

3. The linear temperature-sensing fire detector according to claim 1, wherein: said fusible conductor is formed by sequentially connecting a plurality of conductors in an end-to-end manner, and all connection points in said fusible conductor are easy to use. Solder alloy soldering.

4. The line type temperature sensitive fire detector according to claim 1, wherein: said fusible conductor is an organic conductive plastic wire.

5. A non-recoverable linear temperature-sensing fire detector for an open circuit alarm, comprising a detecting conductor, an insulating layer, and a conversion box, wherein: the pair of detecting conductors arranged in parallel constitute a detecting cable A, and the other pair The detecting conductors arranged in parallel constitute a detecting cable B, and the detecting cable A and the detecting cable B are arranged in parallel to form a composite detecting cable; at least one of the detecting conductors A is easily fusible a conductor, the insulating layer is disposed between the two detecting conductors, wherein the first ends of the two detecting conductors are respectively electrically connected to the input end of the converter box, and a resistor is connected in series between the two detecting conductors. The resistor is connected in series at the tail end of the two detecting conductors, and the fusible conductor has a fusing temperature range of 45: 280 ° C; the first ends of the two detecting conductors in the detecting cable B are respectively converted The input terminals of the box are electrically connected, and a resistor is connected in series between the two detecting conductors. The resistor is connected in series with the tail ends of the two detecting conductors, and a fusible insulating layer is disposed between the two detecting conductors.

6. The line type temperature sensitive fire detector according to claim 5, wherein: said fusible conductor is a fusible alloy wire.

7. The linear temperature-sensing fire detector according to claim 5, wherein: said fusible conductor is formed by sequentially connecting a plurality of conductors in an end-to-end manner, and all connection points in said fusible conductor are easy to use. Solder alloy soldering.

A non-recoverable linear temperature-sensing fire detector for an open circuit alarm, comprising a detecting conductor, an insulating layer, and a conversion box, wherein: the pair of detecting conductors disposed in parallel constitute a detecting cable A; At least one of the detecting conductors A is a fusible conductor, and the insulating layer is disposed between the two detecting conductors, and the first ends of the two detecting conductors are respectively electrically connected to the input end of the converter box, A resistor is connected in series between the two detecting conductors, and the resistor is connected in series at the tail end of the two detecting conductors, and the fusible conductor has a fusing temperature range of 45 Ό 280 280 Ό; detecting one of the detecting cables The conductor is disposed as a common conductor, and another detecting conductor of equal length and matching is disposed in parallel with the common conductor, and a fusible insulating layer is disposed between the detecting conductor and the common conductor to form the detecting cable B; the detecting cable A and the probe cable B constitute a composite probe cable; a first end of one of the probe cables B is electrically connected to the input of the converter box, and one of the probe cables B is detected. A resistor is connected in series between the conductor and the common conductor, and the resistor is connected in series with the tail of the detecting conductor and the common conductor.

9. The linear temperature-sensing fire detector according to claim 8, wherein: said fusible conductor is formed by sequentially connecting a plurality of conductors in an end-to-end manner, and all connection points in said fusible conductor are easy to use. The molten alloy is soldered.

10. The linear temperature-sensing fire detector according to claim 8, wherein: said fusible conductor is an organic conductive plastic wire.