CN213182996U

CN213182996U - Power line for temperature sensing cable and temperature sensing cable

Info

Publication number: CN213182996U
Application number: CN202021283758.8U
Authority: CN
Inventors: 刘超平; 谢友亮; 杨治桦
Original assignee: Jade Bird Fire Co Ltd
Current assignee: Jade Bird Fire Co Ltd
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2021-05-11
Anticipated expiration: 2030-07-03

Abstract

The utility model provides a power cord for temperature sensing cable, include: the positive electrode lead comprises a positive electrode conductor and an insulating layer, and the insulating layer wraps the positive electrode lead; the cathode lead comprises a cathode conductor and an insulating layer, the insulating layer coats the cathode lead, and the anode lead and the cathode lead are arranged in parallel; and the connecting part is of a flat structure, is arranged between the parallel positive wire and the negative wire and connects the positive wire and the negative wire together. Through the utility model discloses an embodiment not only can realize cable formula fire detection, can accurate location ignition's scope moreover.

Description

Power line for temperature sensing cable and temperature sensing cable

Technical Field

The utility model relates to a temperature sensing fire detection application especially relates to a power cord and temperature sensing cable for temperature sensing cable.

Background

A temperature sensing cable is a fire detection device for detecting the ambient temperature of the area where the cable is installed. The traditional cable type linear temperature-sensing detector consists of two metal elastic steel wires coated with a thermosensitive material, when the environmental temperature rises to a preset temperature, the thermosensitive material is softened and broken to cause the two steel wires to be in short circuit, an input module detects a short-circuit signal and then generates an alarm, and the detector sends out a fire alarm signal. The temperature sensing cable can be applied to the following places: the cable tunnel, the cable shaft, the cable interlayer and the cable bridge; the interlayer and the stuffy top of the point type detector are not easy to be arranged; various belt conveyors and other harsh environments are not suitable for the location where the point-type detector is installed.

The statements in this background section merely represent techniques known to the public and are not, of course, representative of the prior art.

SUMMERY OF THE UTILITY MODEL

In view of at least one of the drawbacks of the prior art, the present invention provides a power cord for a temperature sensitive cable, comprising:

the positive electrode lead comprises a positive electrode conductor and an insulating layer, and the insulating layer wraps the positive electrode conductor;

the cathode lead comprises a cathode conductor and an insulating layer, the insulating layer coats the cathode conductor, and the anode lead and the cathode lead are arranged in parallel;

and the connecting part is of a flat structure, is arranged between the parallel positive wire and the negative wire and connects the positive wire and the negative wire together.

According to the utility model discloses an aspect, wherein the thickness of connecting portion is less than the diameter of anodal wire or negative pole wire, the material of connecting portion is insulating material.

The utility model discloses still relate to a temperature sensing cable, include:

the power supply line as described above;

a plurality of temperature sensing units disposed between the positive and negative leads at intervals along the power line, the temperature sensing units being configured to sense an ambient temperature and coupled to the power line; and

and the adjacent temperature sensing units are connected by the fuse wire.

According to an aspect of the utility model, still include the cable sheath, the cable sheath will power cord, temperature sensing unit and fuse cladding are wherein.

According to the utility model discloses an aspect, wherein still be provided with the fuse wire groove on the connecting portion, the fuse sets up in the fuse wire groove.

According to an aspect of the present invention, wherein the connecting portion is further provided with a plurality of mutually spaced placing grooves, and each of the temperature sensing units is disposed in one of the placing grooves.

According to an aspect of the present invention, wherein between two of the temperature sensing units, the connecting portion has one or more notched portions to expose the fusible link.

According to an aspect of the present invention, wherein a cross-sectional configuration of the fuse wire groove is a bell mouth shape.

According to an aspect of the present invention, wherein the fuse is set in a slack state in the fuse groove.

According to an aspect of the present invention, wherein the temperature sensing unit includes a thermistor, a circuit board, and a control chip mounted on the circuit board, wherein a circuit parameter of the thermistor can be changed according to a change in temperature, the control chip is connected to the thermistor and can determine temperature information according to the circuit parameter of the thermistor, and the control chip is coupled to the power line and configured to transmit the temperature information through the power line.

According to an aspect of the present invention, wherein the temperature sensing unit is configured to sense a fuse wire connected thereto, and when the fuse wire is fused, the temperature sensing unit is configured to pass through the power line to transmit the open circuit signal.

According to one aspect of the present invention, wherein the temperature sensing unit and the temperature sensing unit adjacent thereto form a loop, and when the fuse wire between the two is not fused, there is a current in the loop; when the fuse between the two is fused, there is no current in the circuit, and the temperature sensing unit is configured to send a trip signal through the power line when the current is not detected.

According to the utility model discloses an aspect, wherein be provided with first pad and second pad on the circuit board, the positive pole wire is connected with the circuit board through first pad, the negative pole wire passes through the second pad and is connected with the circuit board.

According to the utility model discloses an aspect, wherein thermistor is negative temperature coefficient thermistor, negative temperature coefficient thermistor with the cable sheath closely laminates, and the interval is 90 ~ 100 centimetres between the adjacent temperature sensing control unit.

The embodiment of the utility model provides a through providing a power cord and temperature sensing cable suitable for cable formula temperature sensing fire detector, can realize that cable formula fire detects, the scope of accurate location ignition, just the simple structure of power cord and temperature sensing cable, with low costs, intensity is high, uses more extensively.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic diagram of a power cord according to an embodiment of the present invention;

fig. 2 is a schematic view showing a placement groove of a temperature-sensing cable temperature-sensing control unit according to an embodiment of the present invention;

fig. 3 shows a schematic cross-sectional view of different power lines according to an embodiment of the invention;

fig. 4 is a connection diagram of a temperature sensing unit and a fuse according to an embodiment of the present invention; and

fig. 5 shows a schematic diagram of temperature sensitive cable fuse exposure points in accordance with a preferred embodiment of the present invention.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present invention, it should be noted that unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection, either mechanically, electrically, or in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Embodiments of the present invention will be described with reference to the accompanying drawings, and it should be understood that the embodiments described herein are merely illustrative and explanatory of the present invention, and are not restrictive of the invention.

Fig. 1 shows a schematic diagram of a power cord according to an embodiment of the invention. As shown in the drawing, the power cord 10 for a temperature-sensitive cable includes: a positive electrode lead 1, a negative electrode lead 2, and a connection portion 3. The positive electrode lead 1 comprises a positive electrode conductor 11 and an insulating layer 12, and the insulating layer 12 covers the positive electrode conductor 11. The cathode lead 2 comprises a cathode conductor 13 and an insulating layer 14, the insulating layer 14 coats the cathode conductor 13, and the anode lead 1 and the cathode lead 2 are arranged in parallel. The connecting part 3 is of a flat structure, is arranged between the parallel positive lead 1 and the negative lead 2, and connects the positive lead 1 and the negative lead 2 together. According to a preferred embodiment of the present invention, the wire diameter of the positive and negative conductors is 1 to 2 square millimeters. The positive electrode conductor 11 and the negative electrode conductor 13 may be made of a common copper wire.

According to the utility model discloses an embodiment, wherein the thickness of connecting portion 3 is less than the diameter of anodal wire 1 and/or negative pole wire 2, the material of connecting portion 3 is insulating material. Preferably, the width of the connecting part 3 is 5-7 mm, the thickness is 1.5-2 mm, and the material of the connecting part 3 is a thermoplastic polyurethane polymer insulating material. As shown in fig. 1, the insulating layer 12 of the positive electrode lead 1, the insulating layer 14 of the negative electrode lead 2, and the connecting portion 3 are preferably integrally formed.

Compared with the existing power cord, the power cord 10 shown in fig. 1 integrates the positive lead 1 and the negative lead 2, and when being installed, especially for a temperature sensing cable, the positive lead 1 and the negative lead 2 are not twisted or changed in relative position during deployment. The flat power line more conveniently places the temperature sensing control unit circuit board and the electronic components of the temperature sensing cable in the groove of the power line conjoined part, and the circuit board and the electronic components are not higher than the power line insulating layer, so that the insulating layer can better protect the electronic components from being extruded and damaged; the integral power line can also enable the response of the exposed points of the fusible links arranged at the connecting parts to the temperature to be more consistent according to the appearance and size comparison rules of the temperature sensing cable, namely, the consistency of the response of all detection points of the whole line to the ambient temperature is ensured. When the integrated power line is pulled by external force, the two power lines are stressed uniformly, so that the PCB welding spots welded on the two power lines are not strained, and the reliability of the product is ensured.

The utility model discloses still relate to a temperature sensing cable, as shown in figure 2 according to the utility model discloses a temperature sensing cable temperature sensing control unit standing groove's of embodiment schematic diagram. As shown in the drawing, the temperature sensing cable 100 includes: the power cord 10, the plurality of temperature sensing units 20, and the fusible link 30 as described above (see fig. 4). Wherein the temperature sensing units 20 are disposed between the positive lead 1 and the negative lead 2 at intervals along the power line 10, the temperature sensing units 20 are configured to sense an ambient temperature and coupled to the power line 10. Specifically, the temperature sensing unit 20 is coupled to the power line 10 by welding at the illustrated positions with the positive electrode lead 1 and the negative electrode lead 2 shown in fig. 2. The adjacent temperature sensing units 20 are connected by the fusible links 30. Only one temperature sensing unit 20 is schematically shown in fig. 2 and 4.

According to an embodiment of the present invention, the temperature sensing cable 100 further includes a cable sheath (not shown in the figure) that covers the power line 10, the temperature sensing unit 20 and the fusible link 30 therein. The cable sheath is made of a thermoplastic polyurethane polymer insulating material optionally, has the characteristics of high strength, good toughness, friction resistance, good weather resistance, mechanical stretching resistance, corrosion resistance, wear resistance, cold resistance, oil resistance, water resistance, aging resistance and the like, and is tightly wrapped on the surfaces of the internal power line 10, the temperature sensing unit 20 and the fusible link 30 to protect and protect the internal devices. When the cable sheath is packaged, the cable sheath is directly and tightly attached to the power line 10 and the temperature sensing unit 20 in a vacuumizing mode inside the extrusion molding die, and the phenomenon that the heat conduction is affected due to the fact that a bubble heat insulation layer is arranged inside the cable is avoided. A fuse groove 4 (shown in fig. 1 and 2) extending in the longitudinal direction of the power supply line 10 is provided on the connection portion 3 of the power supply line 10, and the fuse 30 is provided in the fuse groove 4 (shown in fig. 4).

Fig. 3 shows a schematic cross-sectional view of different power lines according to an embodiment of the invention. As shown in the figure, the power line 10 has three different cross sections, 10-1, 10-2 and 10-3 respectively, according to three different fuse wire grooves 4-1, 4-2 and 4-3 respectively. The fuse wire groove 4-1 is configured in a shape of a bell mouth combined with three quarters of a circle, the fuse wire groove 4-2 is configured in a shape of a trapezoid mouth combined with three quarters of a circle, and the fuse wire groove 4-3 is configured in a shape of a trapezoid mouth combined with a cloud-like figure composed of three circles. The fuse wire groove 4 is configured in the shape, so that the fuse wire 30 is easily placed into the fuse wire groove 4 along the direction of the notch, and is clamped after being placed, so that the fuse wire is not easy to fall off. And the fuse wire 30 is set to be in a loose state in the fuse wire groove 4, so as to prevent the fuse wire 30 from being pulled apart due to stress when the cable is bent, thereby causing wrong alarm information.

It is also preferable that the fuse 30 is fixed to the fuse groove 4 by closing an opening (a bell mouth or a trapezoidal mouth as described above) of the fuse groove by a molten plastic insulating material after the fuse 30 is placed in the fuse groove 4.

Fig. 4 is a connection diagram of a temperature sensing unit and a fuse according to an embodiment of the present invention. As shown in the drawing, a plurality of placing grooves 40 are provided on the connecting portion 3 at intervals, and each of the temperature sensing units 20 is provided in one of the placing grooves 40. The placement groove 40 may be a hollowed-out portion of the connection portion 30. As described above, after the fuse 30 is placed in the fuse groove 4, the fuse 30 may be enclosed in the fuse groove 4 by the melted plastic insulating material. It is further preferable that the connecting portion 3 has one or more notch portions 50 (i.e., an opening portion on a closed portion formed of a plastic insulating material) between two adjacent temperature sensing units 20 to expose the fusible link 30, and the exposed fusible link 30 is disposed to be closely attached to the cable sheath when the cable sheath is encapsulated, and the fusible link 30 can more timely follow the change of the external environment temperature due to the wrapping material only separating the cable sheath. The one or more notch portions 50 are exposed points of the fusible link 30, which are temperature detecting points of the temperature sensing cable 100. In this way, the fusible link 30 can more accurately detect a slight change in the ambient temperature.

According to an embodiment of the present invention, as shown in fig. 4, the temperature sensing unit 20 includes a thermistor 21, a circuit board 22, and a control chip (not shown) mounted on the circuit board 22, wherein the circuit parameter of the thermistor 21 can be changed according to the change of the temperature, the control chip is connected to the thermistor 21 and can determine the temperature information according to the circuit parameter of the thermistor, and the control chip is coupled to the power line 10 and configured to transmit the temperature information through the power line 10. Preferably, the control chip is configured to trigger a high temperature alarm when the temperature sensed by the thermistor 21 exceeds a temperature threshold, and send an alarm signal through the power line 10. According to an embodiment of the present invention, wherein the circuit board 22 is provided with a first pad 23 and a second pad 24, the positive electrode lead 1 is connected to the circuit board 22 through the first pad 23, and the negative electrode lead 2 is connected to the circuit board 22 through the second pad 24. Therefore, in this embodiment, the power line 10 can be used for transmitting signal data in addition to supplying power to the temperature sensing unit 20.

According to an embodiment of the present invention, the temperature sensing unit 20 is configured to sense the fusing of a fuse 30 connected thereto, and when the fuse 30 is fused, the temperature sensing unit 20 is configured to send a disconnection signal through a signal line, wherein the signal line is the positive wire 1 and the negative wire 2 of the power line 10. According to an embodiment of the present invention, the temperature sensing unit 20 and the temperature sensing unit 20 adjacent thereto form a loop in which the fuse wire 30 is located. When the fuse 30 between the two is not blown, there is a current in the loop; when the fuse 30 therebetween is blown, there is no current in the circuit, and the temperature sensing unit 20 is configured to send a disconnection signal through the signal line when the current is not detected.

According to the utility model discloses a preferred embodiment, thermistor 21 in the temperature sensing cable 100 configures as negative temperature coefficient thermistor, negative temperature coefficient thermistor with the cable sheath closely laminates, and the interval between the adjacent temperature sensing control unit 20 is 90 ~ 100 centimetres to with ignition point accurate positioning in the within range of a meter.

According to an embodiment of the present invention, each temperature sensing unit 20 has its serial number ID or address. When the temperature sensing unit 20 sends temperature information, open circuit information, or an alarm signal through a signal line, the data includes the serial number ID or address. After receiving the temperature information or the disconnection information, the controller of the fire protection system can know the specific position of the temperature sensing unit 20 where the corresponding event occurs according to the attached serial number ID or address.

Fig. 5 shows a schematic diagram of temperature sensitive cable fuse exposure points in accordance with a preferred embodiment of the present invention. As shown in the figure, the distance between two adjacent temperature sensing control units 20 is 100 cm, wherein the connecting portion 3 has three notch portions 50 in total to expose the fusible link 30 to be directly attached to the cable sheath, and each notch portion 50 has a length of 13.3 cm and is produced by a punching device. The fuse wire 30 is placed in the fuse wire groove 4 in the remaining three sections of the part with the length of 20 cm, and is not exposed.

The utility model provides a power cord and temperature sensing cable suitable for cable formula temperature sensing fire detector can realize cable formula fire detection, the scope of accurate location ignition, just the simple structure of power cord and temperature sensing cable, and is with low costs, and intensity is high, uses more extensively.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power cord for a temperature-sensitive cable, comprising:

2. The electrical power cord as set forth in claim 1, wherein the thickness of the connecting portion is smaller than the diameter of the positive electrode lead and/or the negative electrode lead, and the connecting portion is made of an insulating material.

3. A temperature-sensitive cable, comprising:

the power supply line of claim 1 or 2;

and the adjacent temperature sensing units are connected by the fuse wire.

4. The temperature-sensitive cable according to claim 3, further comprising a cable sheath that encloses the power supply line, the temperature-sensitive unit, and the fusible link therein.

5. The temperature-sensitive cable according to claim 3 or 4, wherein the connection part is further provided with a fuse groove in which the fuse is disposed.

6. The temperature-sensitive cable according to claim 3 or 4, wherein the connection part is further provided with a plurality of placement grooves spaced apart from each other, and each of the temperature-sensitive units is disposed in one of the placement grooves.

7. The temperature-sensitive cable according to claim 3 or 4, wherein the connecting portion has one or more notch portions between the two temperature-sensitive cells to expose the fusible links.

8. The temperature-sensitive cable according to claim 5, wherein a cross-section of the fuse wire groove is configured in a bell mouth shape.

9. The temperature-sensitive cable according to claim 5, wherein the fusible link is set in a relaxed state in the fusible link groove.

10. The temperature-sensing cable of claim 4, wherein the temperature-sensing unit includes a thermistor, a circuit board, and a control chip mounted on the circuit board, wherein a circuit parameter of the thermistor is variable according to a change in temperature, the control chip is connected to the thermistor and determines temperature information according to the circuit parameter of the thermistor, and the control chip is coupled to the power line and configured to transmit the temperature information through the power line.

11. A temperature-sensitive cable according to claim 3 or 4, wherein the temperature-sensitive unit is arranged to sense the melting of a fuse associated therewith, the temperature-sensitive unit being arranged to send a trip signal via the power supply line when the fuse melts.

12. A temperature-sensitive cable according to claim 3 or 4, wherein the temperature-sensitive cells and the temperature-sensitive cells adjacent thereto form a circuit in which there is an electric current when the fuse between the two is not fused; when the fuse between the two is fused, there is no current in the circuit, and the temperature sensing unit is configured to send a trip signal through the power line when the current is not detected.

13. The temperature-sensing cable according to claim 10, wherein the circuit board is provided with a first land and a second land, the positive electrode lead is connected to the circuit board through the first land, and the negative electrode lead is connected to the circuit board through the second land.

14. The temperature-sensing cable according to claim 10, wherein the thermistor is a negative temperature coefficient thermistor, the negative temperature coefficient thermistor is closely attached to the cable sheath, and a distance between adjacent temperature-sensing control units is 90-100 cm.