Anti-interference temperature and gas composite linear fire detector

Abstract

The utility model belongs to the technical field of fire detection, and discloses an anti-interference temperature and gas composite linear fire detector, which comprises an anti-interference temperature sensing cable, a temperature and gas detection unit and a signal processing unit, and is characterized in that the anti-interference temperature sensing cable comprises a power wire core, a metal wire core and a grounding metal wire core; the temperature and gas detection unit is in cascade connection with a grounding metal wire core of the anti-interference temperature sensing cable, the temperature and gas detection unit is configured to collect the combustible gas content, the temperature value and the position information of a protected object, and the signal processing unit is electrically connected with the temperature and gas detection unit and used for receiving data collected by the temperature detection unit for early warning. According to the anti-interference temperature and gas composite linear fire detector, numerical values collected by the temperature and gas detection unit are transmitted to the signal processing unit through the power line core, so that the signal processing unit can display the operation state, a fire alarm signal and a fault signal in real time, fire characteristics are extracted in time, and the occurrence of large-scale fire disasters is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fire detection, in particular to an anti-interference temperature-gas composite linear fire detector. Background Art

[0002] There are usually communication facilities, high-power power supplies and other electronic equipment around industrial sites. These devices may generate strong electromagnetic fields, causing electromagnetic interference to the fire detection devices installed around the equipment, affecting the normal operation of the detectors.

[0003] Early fire detection in industrial sites usually uses a temperature threshold alarm, that is, when the temperature of the protected object exceeds the set temperature threshold, the fire alarm signal is triggered. This method uses a single detection parameter as the basis for judging the occurrence of a fire, which has certain limitations. Therefore, smoke detectors and flame detectors are also set up on site, resulting in complex wiring, and they fail to extract fire characteristics at an early stage, which can easily cause large-scale fires. Utility Model Content

[0004] The utility model aims to provide an anti-interference temperature-gas composite linear fire detector to solve the technical problem that the existing fire detectors cannot extract fire characteristics in the early stage of a fire, which easily causes a large-scale fire.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] Anti-interference temperature and gas composite linear fire detector, including:

[0007] An anti-interference temperature sensing cable, comprising a power core, a metal core and a grounding metal core, wherein the power core and the metal core are twisted and coated with a tape to form a core body, and the core body and the grounding metal core are arranged in parallel;

[0008] a temperature and gas detection unit, which is cascaded with the grounded metal wire core of the anti-interference temperature sensing cable, and the temperature and gas detection unit is configured to collect combustible gas content, temperature value and position information of the protected object; and

[0009] The signal processing unit is electrically connected to the temperature detection unit and is used to receive the data collected by the temperature detection unit for early warning.

[0010] By setting up a grounded metal wire core and a temperature and gas detection unit in cascade, the electromagnetic anti-interference capability is enhanced, making it suitable for industrial sites with strong electromagnetic interference. The temperature and gas detection unit can extract the combustible gas content and temperature value released by the protected object in the early stage of the fire, and combine the two data as the basis for judging the occurrence of the fire, so as to achieve accurate and effective fire detection. The values ​​collected by the temperature and gas detection unit are transmitted to the signal processing unit through the power line core, so that the signal processing unit can display the operating status, fire alarm signal and fault signal in real time, and the fire characteristics are extracted in time, which is conducive to reducing the occurrence of large-scale fires.

[0011] Preferably, the temperature detection unit comprises:

[0012] A housing, on which a ventilation grille and a temperature detection window are provided;

[0013] A sensor, comprising a combustible gas sensor and a temperature sensor disposed in the housing, wherein the combustible gas sensor is disposed corresponding to the air-permeable grille, and the temperature sensor is disposed corresponding to the temperature detection window; and

[0014] A circuit board is arranged in the shell and connected to each core of the anti-interference temperature sensing cable. The circuit board is provided with a communication module (operating status, fire alarm signal and fault signal) and a positioning module (locating the fire source) electrically connected to the signal processing unit and the sensor.

[0015] Preferably, a plurality of metal contacts are respectively provided at both ends of the circuit board, and the power core, the metal core and the grounding metal core of the anti-interference temperature sensing cable located at both ends of the circuit board are arranged on the metal contacts one by one;

[0016] The circuit board is also provided with a metal conductor circuit connecting the grounded metal wire cores at both ends. Spring antennas are respectively provided on two corresponding surfaces of the circuit board. One end of the two spring antennas is located on the metal conductor circuit, and the other ends of the two spring antennas are elastically abutted against the inner surface of the shell.

[0017] The combined structure of the spring antenna and the grounded metal wire core can further enhance the electromagnetic anti-interference capability.

[0018] Preferably, the shell includes an upper shell layer, a middle shell layer and a lower shell layer, the upper shell layer and the middle shell layer, and the middle shell layer and the lower shell layer are all connected by snaps, the sensor is located between the upper shell layer and the lower shell layer, and the circuit board is located between the middle shell layer and the lower shell layer.

[0019] The shell is divided into three shell layers. The upper shell layer and the middle shell layer can fix the sensor, and the air grille and the temperature detection window are opened on the upper shell layer. The combustible gas sensor corresponds to the air grille during installation, and the temperature sensor corresponds to the temperature detection window. The upper shell layer and the middle shell layer are detachably connected by buckles for easy maintenance or replacement. The middle shell layer and the lower shell layer can fix the circuit board, and the circuit board is cascaded with the anti-interference temperature sensing cable to achieve wiring integration for easy installation.

[0020] Preferably, installation grooves are provided at the edges of the middle shell layer and the lower shell layer, and the anti-interference temperature sensing cable is press-fitted between the middle shell layer and the lower shell layer through the installation grooves.

[0021] The anti-interference temperature sensing cable is pressed between the middle shell layer and the lower shell layer through the installation groove, which prevents the power wire core, the metal wire core and the grounding metal wire core from being separated from the metal contact, thereby improving the firmness of the connection between the anti-interference temperature sensing cable and the circuit board.

[0022] Preferably, a filter layer is provided at the air-permeable grille on the inner surface of the upper shell layer.

[0023] The setting of the filter layer can filter out water vapor and dust in the combustible gas, thereby improving the effectiveness of combustible gas detection.

[0024] Preferably, the inner surfaces of the upper shell layer and the lower shell layer are coated with conductive paint, and the other ends of the two spring antennas are elastically abutted against the inner surfaces of the upper shell layer and the lower shell layer respectively.

[0025] Conductive paint can further enhance electromagnetic interference resistance.

[0026] Preferably, the anti-interference temperature-gas composite linear fire detector is installed at the protected object in a contact or non-contact manner.

[0027] The installation location of the anti-interference temperature-gas composite linear fire detector is not restricted by the installation environment, and it can be used in more scenarios.

[0028] Preferably, the wire core body and the outside of the grounding metal conductor are sequentially coated with a conductive aluminum foil layer and an insulating outer sheath.

[0029] The conductive aluminum foil layer can be wrapped around the outside of the wire core and the grounded metal wire core using conductive aluminum foil tape, which can eliminate electromagnetic interference and has a good effect on static discharge after grounding. The insulating outer sheath can be made of rubber, which has good insulation properties and can prevent current leakage and electromagnetic interference.

[0030] Preferably, the outside of the power cord core is covered with an insulating inner sheath, and the outside of the metal wire core is covered with a heat-sensitive insulation layer.

[0031] The insulating inner sheath can be a metal sheath, a flat aluminum sheath, a corrugated aluminum sheath, a copper sheath, a composite sheath, a non-metallic plastic sheath, a rubber sheath, etc., which can electrically isolate the power cord core and the metal wire core from each other to ensure power transmission and communication transmission.

[0032] Beneficial effects of the utility model:

[0033] By setting up a grounded metal wire core and a temperature and gas detection unit in cascade, the electromagnetic anti-interference capability is enhanced, making it suitable for industrial sites with strong electromagnetic interference. The temperature and gas detection unit can extract the combustible gas content and temperature value released by the protected object in the early stage of the fire, and combine the two data as the basis for judging the occurrence of the fire, so as to achieve accurate and effective fire detection. The values ​​collected by the temperature and gas detection unit are transmitted to the signal processing unit through the power line core, so that the signal processing unit can display the operating status, fire alarm signal and fault signal in real time, and the fire characteristics are extracted in time, which is conducive to reducing the occurrence of large-scale fires. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the structure of an anti-interference temperature-gas composite linear fire detector provided by an embodiment of the utility model;

[0035] Figure 2 is along Figure 1 Sectional view along line AA;

[0036] Figure 3 It is an exploded view of the temperature detection unit provided by the embodiment of the utility model;

[0037] Figure 4 This is a schematic diagram of the structure of the circuit board provided by the embodiment of the utility model Figure 1 ;

[0038] Figure 5 This is a schematic diagram of the structure of the circuit board provided by the embodiment of the utility model Figure 2 .

[0039] In the figure:

[0040] 1. Wire core; 10. Power wire core; 101. Insulation inner sheath; 11. Metal wire core; 111. Thermosensitive barrier; 12. Tape; 2. Grounding metal wire core; 3. Conductive aluminum foil layer; 4. Insulation outer sheath;

[0041] 5. Shell; 51. Upper shell layer; 511. Air permeable grille; 512. Temperature detection window; 52. Middle shell layer; 53. Lower shell layer; 531. Mounting slot;

[0042] 6. Combustible gas sensor; 7. Temperature sensor;

[0043] 8. Circuit board; 81. Metal contact; 82. Metal conductor circuit; 83. Spring antenna;

[0044] 9. Signal processing unit. DETAILED DESCRIPTION

[0045] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0046] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0048] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0049] Early fire detection in industrial sites usually uses a temperature threshold alarm, that is, when the temperature of the protected object exceeds the set temperature threshold, the fire alarm signal is triggered. This method uses a single detection parameter as the basis for judging the occurrence of a fire, which has certain limitations. Therefore, smoke detectors and flame detectors are also set up on site, resulting in complex wiring, and they fail to extract fire characteristics at an early stage, which can easily cause large-scale fires.

[0050] In order to solve the above problems, combined Figure 1-Figure 5 As shown, this embodiment provides an anti-interference temperature-gas composite linear fire detector, which is mainly composed of an anti-interference temperature-sensing cable, a temperature-gas detection unit and a signal processing unit 9.

[0051] The anti-interference temperature sensing cable of this embodiment includes a power core 10, a metal core 11 and a grounding metal core 2. The power core 10 is twisted with the metal core 11, and the outer part of the power core 10 and the metal core 11 is wrapped with a tape 12 to form a core body 1, and the core body 1 is arranged in parallel with the grounding metal core 2. The temperature detection unit is cascaded with the grounding metal core 2 of the anti-interference temperature sensing cable. Through the cascade of the two, the electromagnetic anti-interference ability of the anti-interference temperature and gas composite linear fire detector can be enhanced to be suitable for industrial places with strong electromagnetic interference.

[0052] Furthermore, the temperature and gas detection unit is used to collect the combustible gas content, temperature value and position information of the protected object, so that the temperature and gas detection unit can extract the combustible gas content and temperature value released by the protected object in the early stage of the fire, and combine the two data as the basis for judging the occurrence of fire, thereby achieving accurate and effective fire detection.

[0053] Furthermore, the signal processing unit 9 is electrically connected to the temperature detection unit to receive the data collected by the temperature detection unit for early warning. The values ​​collected by the temperature detection unit are transmitted to the signal processing unit 9 through the power cord 10, so that the signal processing unit 9 can display the operating status, fire alarm signal and fault signal in real time, and the fire characteristics are extracted in time, which is conducive to reducing the occurrence of large-scale fires.

[0054] like Figure 2 As shown, the power cord core 10 is wrapped with an insulating inner sheath 101, which can be a metal sheath, a flat aluminum sheath, a corrugated aluminum sheath, a copper sheath, a composite sheath, a non-metallic plastic sheath, a rubber sheath, etc., which can electrically isolate the power cord core 10 from the metal wire core 11 to ensure power transmission and communication transmission. The metal wire core 11 is coated with a thermal insulation layer 111, which can be a thermal ceramic material, a thermocouple material, and a platinum thermal resistor, which can accurately detect temperature changes.

[0055] Specifically, in this embodiment, two power cord cores 10 and two metal cord cores 11 are respectively provided, and one grounding metal cord core 2 is provided, which is a coreless structure. In other embodiments, the number of power cord cores 10, metal cord cores 11 and grounding metal cord cores 2 can be set according to actual conditions, and this embodiment does not make specific limitations.

[0056] In addition, the outside of the wire core 1 and the grounded metal conductor core are sequentially coated with a conductive aluminum foil layer 3 and an insulating outer sheath 4. The conductive aluminum foil layer 3 can be wrapped around the outside of the wire core 1 and the grounded metal wire core 2 using a conductive aluminum foil tape, which can eliminate electromagnetic interference and has a good effect on static discharge after grounding. The insulating outer sheath can be made of rubber, which has good insulation properties and can prevent current leakage and electromagnetic interference.

[0057] like Figure 3 As shown, the temperature detection unit includes a shell 5, a sensor and a circuit board 8. The shell 5 includes an upper shell layer 51, a middle shell layer 52 and a lower shell layer 53. The shell 5 is divided into three shell layers, the sensor is located between the upper shell layer 51 and the lower shell layer 53, the upper shell layer 51 and the middle shell layer 52 can fix the sensor, the circuit board 8 is located between the middle shell layer 52 and the lower shell layer 53, the middle shell layer 52 and the lower shell layer 53 can fix the circuit board 8, and the edges of the middle shell layer 52 and the lower shell layer 53 are also provided with mounting grooves 531, and the anti-interference temperature sensing cable is pressed between the middle shell layer 52 and the lower shell layer 53 through the mounting grooves 531. In addition, the upper shell layer 51 and the middle shell layer 52, as well as the middle shell layer 52 and the lower shell layer 53 are connected by buckles, and the buckles are in the form of mother-and-child buckles, so as to realize the detachable connection between adjacent shell layers, which is convenient for maintenance or replacement. Since the buckles are prior art, the specific structure of the buckles will not be described in detail here.

[0058] In addition, in order to prevent the buckle from loosening, bolts (not shown in the figure) are used to connect the shell layers together, so that the connection is more secure.

[0059] Further, see Figure 3 An air-permeable grille 511 and a temperature detection window 512 are provided on the upper shell layer 51. The sensors include a combustible gas sensor 6 and a temperature sensor 7. The combustible gas sensor 6 is provided corresponding to the air-permeable grille 511, and the temperature sensor 7 is provided corresponding to the temperature detection window 512. A filter layer (not shown in the figure) is also provided on the inner surface of the air-permeable grille 511 of the upper shell layer 51. The filter layer can filter water vapor and dust in the combustible gas, thereby improving the effectiveness of combustible gas detection. The filter layer is preferably a filter disc.

[0060] like Figure 4 and Figure 5As shown, the circuit board 8 is arranged in the shell 5 and connected to the cores of the anti-interference temperature sensing cable. The circuit board 8 is provided with a communication module and a positioning module electrically connected to the signal processing unit 9 and the sensor. The communication module is used to transmit the operating status, fire alarm signal and fault signal, and the positioning module is used to locate the fire source.

[0061] The sensor collects the values ​​of the concentration and temperature of the combustibles. The communication module provided on the circuit board 8 can transmit the collected values ​​to the signal processing unit 9 through the power cord 10. The signal processing unit 9 displays the operating status, fire alarm signal and fault signal in real time. The signal processing unit 9 can also be provided with an alarm module. The alarm module is provided with an alarm threshold. When the value exceeds the alarm threshold, the alarm module activates the alarm device electrically connected thereto to sound an alarm.

[0062] Specifically, a plurality of metal contacts 81 are respectively provided at both ends of the circuit board 8, and the power supply core 10, metal core 11 and grounding metal core 2 of the anti-interference temperature sensing cable at both ends of the circuit board 8 are welded to the metal contacts 81 one by one. The circuit board 8 is also provided with a metal conductor circuit 82 connecting the grounding metal cores 2 at both ends. The metal contacts 81 of the circuit board 8 are cascaded with the grounding metal core 2 of the anti-interference temperature sensing cable to achieve wiring integration and facilitate installation. Spring antennas 83 are also welded to the two corresponding surfaces of the circuit board 8, one end of each of the two spring antennas 83 is located on the metal conductor circuit 82, the other end of one of the spring antennas 83 is elastically abutted on the inner surface of the upper shell 51, and the other end of the other spring antenna 83 is elastically abutted on the inner surface of the lower shell 53. For this reason, the inner surfaces of the upper shell 51 and the lower shell 53 are coated with conductive paint, which can further enhance the electromagnetic anti-interference ability. Of course, the combination structure of the spring antenna 83 and the grounding metal core 2 can also further enhance the electromagnetic anti-interference ability.

[0063] The anti-interference temperature-gas composite linear fire detector of this embodiment is installed at the protected object in a contact or non-contact manner, so that the installation position of the anti-interference temperature-gas composite linear fire detector is not limited by the installation environment and can be used in more scenarios.

[0064] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Anti-interference temperature and gas composite linear fire detector, characterized in that: include: An anti-interference temperature sensing cable comprises a power core (10), a metal core (11) and a grounding metal core (2); the power core (10) and the metal core (11) are twisted together and coated with a tape (12) to form a core body (1); the core body (1) and the grounding metal core (2) are arranged in parallel; A temperature and gas detection unit, which is cascaded with the grounded metal wire core (2) of the anti-interference temperature sensing cable, and the temperature and gas detection unit is configured to collect combustible gas content, temperature value and position information of the protected object; as well as A signal processing unit (9) is electrically connected to the temperature detection unit and is used to receive data collected by the temperature detection unit for early warning.

2. The anti-interference temperature-gas composite linear fire detector according to claim 1 is characterized in that: The temperature detection unit comprises: A housing (5) having a ventilation grille (511) and a temperature detection window (512) provided thereon; A sensor, comprising a combustible gas sensor (6) and a temperature sensor (7) arranged in the housing (5), wherein the combustible gas sensor (6) is arranged corresponding to the air permeable grille (511), and the temperature sensor (7) is arranged corresponding to the temperature detection window (512); and A circuit board (8) is arranged in the housing (5) and connected to each wire core of the anti-interference temperature sensing cable. The circuit board (8) is provided with a communication module and a positioning module which are electrically connected to the signal processing unit (9) and the sensor.

3. The anti-interference temperature-gas composite linear fire detector according to claim 2 is characterized in that: A plurality of metal contacts (81) are respectively arranged at both ends of the circuit board (8), and the power core (10), the metal core (11) and the grounding metal core (2) of the anti-interference temperature sensing cable located at both ends of the circuit board (8) are arranged on the metal contacts (81) in a one-to-one correspondence; The circuit board (8) is also provided with a metal conductor circuit (82) connected to the grounded metal wire core (2) at both ends. Two corresponding surfaces of the circuit board (8) are respectively provided with spring antennas (83). One end of the two spring antennas (83) is located on the metal conductor circuit (82), and the other ends of the two spring antennas (83) are elastically abutted against the inner surface of the shell (5).

4. The anti-interference temperature-gas composite linear fire detector according to claim 3 is characterized in that: The shell (5) comprises an upper shell layer (51), a middle shell layer (52) and a lower shell layer (53); the upper shell layer (51) and the middle shell layer (52), as well as the middle shell layer (52) and the lower shell layer (53) are all connected via snaps; the sensor is located between the upper shell layer (51) and the lower shell layer (53); and the circuit board (8) is located between the middle shell layer (52) and the lower shell layer (53).

5. The anti-interference temperature-gas composite linear fire detector according to claim 4 is characterized in that: Installation grooves (531) are provided at the edges of the middle shell layer (52) and the lower shell layer (53), and the anti-interference temperature sensing cable is pressed between the middle shell layer (52) and the lower shell layer (53) through the installation grooves (531).

6. The anti-interference temperature-gas composite linear fire detector according to claim 4 is characterized in that: A filter layer is provided at the air-permeable grille (511) on the inner surface of the upper shell layer (51).

7. The anti-interference temperature-gas composite linear fire detector according to claim 4 is characterized in that: The inner surfaces of the upper shell layer (51) and the lower shell layer (53) are both coated with conductive paint, and the other ends of the two spring antennas (83) are elastically abutted against the inner surfaces of the upper shell layer (51) and the lower shell layer (53), respectively.

8. The anti-interference temperature-gas composite linear fire detector according to any one of claims 1 to 7, characterized in that: The anti-interference temperature-gas composite linear fire detector is installed at the protected object in a contact or non-contact manner.

9. The anti-interference temperature-gas composite linear fire detector according to any one of claims 1 to 7, characterized in that: The outside of the wire core body (1) and the grounding metal wire core (2) are sequentially covered with a conductive aluminum foil layer (3) and an insulating outer sheath (4).

10. The anti-interference temperature-gas composite linear fire detector according to any one of claims 1 to 7, characterized in that: The outside of the power line core (10) is covered with an insulating inner protective layer (101), and the outside of the metal line core (11) is covered with a heat-sensitive insulation layer (111).

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