Cable type temperature sensing fire detector

Abstract

The utility model provides a cable type temperature-sensing fire detector. The cable type temperature-sensing fire detector comprises a temperature-sensing cable, a signal processing unit and a terminal box, wherein the signal processing unit and the terminal box are respectively connected to two ends of the temperature-sensing cable; the device further comprises an automatic heating detection unit. The automatic heating detection unit comprises a heating controller, a heating assembly and a temperature sensor; the heating controller is electrically connected with the signal processing unit, the heating assembly and the temperature sensor. The heating assembly is wound outside any part of the temperature sensing cable; the temperature sensor is arranged in the heating assembly or between the heating assembly and the wound temperature sensing cable. The automatic heating detection unit is additionally arranged on the cable type temperature-sensitive fire detector, so that the alarm performance of the detector can be regularly and automatically detected, and the workload of manual maintenance is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of fire detection technology, and relates to a cable-type heat-sensing fire detector, and particularly to a cable-type heat-sensing fire detector with an automatic heating detection unit. Background Technology

[0002] Existing cable-type heat-sensing fire detectors mainly consist of a signal processing unit, a heat-sensing cable, and a terminal resistor box. During long-term use, problems such as aging of the heat-sensitive material in the heat-sensing cable may occur, resulting in the inability to alarm in a timely manner or even the failure to alarm at all during a fire.

[0003] To ensure timely and reliable fire alarms from cable-type heat-sensitive fire detectors, the existing technology involves periodically performing manual temperature-raising tests on the detectors to trigger an alarm. This involves heating the detector's sensing cable using an open flame or boiling water. However, cable-type heat-sensitive fire detectors are primarily used for fire detection in high-voltage electrical facilities such as power cables and transformers within cable trenches. On-site heating tests of the sensing cable by personnel are not only time-consuming and labor-intensive but may also pose safety hazards due to human negligence. Utility Model Content

[0004] The purpose of this invention is to provide a cable-type heat-sensing fire detector that can automatically detect heating and is safe and reliable. The cable-type heat-sensing fire detector includes a heat-sensing cable and signal processing units and terminal boxes connected to its two ends respectively; it also includes an automatic heating detection unit; the automatic heating detection unit includes a heating controller, a heating component, and a temperature sensor; the heating controller is electrically connected to the signal processing unit, the heating component, and the temperature sensor respectively; the heating component is wound around any part of the heat-sensing cable; the temperature sensor is disposed inside the heating component or between the heating component and the wound heat-sensing cable.

[0005] Preferably, the heating component is one of a spiral heating tube, a hinged heating clamp, or a snap-on heating sleeve.

[0006] Preferably, the winding length of the heating component is the minimum heated length of the temperature sensing cable corresponding to a specific alarm activation temperature.

[0007] Preferably, the cable-type heat-sensing fire detector is a recoverable or non-recoverable cable-type heat-sensing fire detector.

[0008] Preferably, the cable-type heat-sensing fire detector further includes a remote host computer unit, which is electrically connected to the signal processing unit. The remote host computer unit includes a remote control module and a display and alarm module. The remote host computer unit can control and monitor the automatic heating detection unit to perform various basic performance tests of the detector through the monitoring signal processing unit, or it can control and monitor the automatic heating detection unit to perform various basic performance tests of the detector through the monitoring and control signal processing unit, and so on.

[0009] Preferably, the remote host computer unit is a fire alarm controller, or a user's on-site DCS system or FAS system.

[0010] This utility model also provides another type of cable-type heat-sensing fire detector, which includes a heat-sensing cable and signal processing units and terminal boxes respectively connected to its two ends; it also includes an automatic heating detection unit and a remote host computer unit; the automatic heating detection unit includes a heating controller, a heating component and a temperature sensor; the heating controller is electrically connected to the signal processing unit, the heating component and the temperature sensor respectively; the heating component is wound around any part of the heat-sensing cable; the temperature sensor is disposed inside the heating component or between the heating component and the wound heat-sensing cable; the remote host computer unit is electrically connected to the signal processing unit and the heating controller respectively, and the remote host computer unit includes a remote control module and a display alarm module.

[0011] Preferably, the remote host computer unit is a fire alarm controller, or a user's on-site DCS system or FAS system.

[0012] Preferably, the heating component is one of a spiral heating tube, a hinged heating clamp, or a snap-on heating sleeve.

[0013] Preferably, the winding length of the heating component is the minimum heated length of the temperature sensing cable corresponding to a specific alarm activation temperature.

[0014] Preferably, the cable-type heat-sensing fire detector is a recoverable or non-recoverable cable-type heat-sensing fire detector.

[0015] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0016] 1. Enables periodic automated testing: By adding an automatic heating detection unit to the cable-type heat-sensing fire detector, the detector's alarm performance can be tested automatically on a periodic basis, reducing the workload of manual maintenance.

[0017] 2. Supports remote control from a host computer: A remote host computer unit (such as a fire alarm controller) can remotely control the automatic heating detection unit to enter the detection working state, which improves the flexibility and operability of the entire fire alarm system.

[0018] 3. Supports basic performance testing of recoverable or non-recoverable cable-type heat-sensing fire detectors: In accordance with national product standards, it enables online testing of constant temperature alarm activation / deactivation and differential temperature alarm activation / deactivation at the standard temperature measurement length (or the minimum heat-exposed length of the heat-sensing cable corresponding to a specific alarm activation temperature). The testing modes are more comprehensive and better reflect the actual operating conditions of the product.

[0019] 4. Enables testing at any point along the temperature-sensing cable: Using heating components such as spiral heating tubes, hinged heating plates, and snap-on heating sleeves, the temperature-sensing cable can be heated according to the test length given by national standards, or it can be set at any point along the entire length of the temperature-sensing cable, making it convenient for users to test at any point along the entire length of the temperature-sensing cable.

[0020] 5. Improve the reliability of the entire fire alarm system: Through regular automatic heating detection, if an abnormality occurs, the detection results are fed back to the outside world through means such as outputting audible and visual alarms and remote signal output, so that users can detect the fault of the cable-type heat-sensing fire detector in time, thereby improving the reliability and safety of the entire fire alarm system. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a cable-type heat-sensing fire detector provided in Embodiment 1;

[0022] Figure 2 This is a schematic diagram of a cable-type heat-sensing fire detector provided in Embodiment 2;

[0023] Explanation of the labels in the attached drawings:

[0024] 1. Signal processing unit; 2. Temperature sensing cable; 3. Terminal box; 4. Heating controller; 5. Heating component; 6. Temperature sensor; 7. Remote host computer unit; 71. Remote control module; 72. Display and alarm module. Detailed Implementation

[0025] The cable-type heat-sensing fire detector provided by this utility model will be described in detail below with reference to the accompanying drawings and embodiments. Example 1

[0026] A cable-type heat-sensing fire detector includes a cable-type heat-sensing fire detector and its automatic heating detection unit; wherein the cable-type heat-sensing fire detector includes a heat-sensing cable 2 and a signal processing unit 1 and a terminal box 3 respectively connected to its two ends; the cable-type heat-sensing fire detector is a prior art cable-type heat-sensing fire detector with recoverable or non-recoverable characteristics; the automatic heating detection unit includes a heating controller 4, a heating component 5 and a temperature sensor 6. The heating controller 4 is either separately configured or integrated within the signal processing unit 1, and is electrically connected to the signal processing unit 1, the heating component 5, and the temperature sensor 6, respectively. The heating controller 4 receives test commands from the signal processing unit 1, controls the opening and closing of the heating component 5, and simultaneously monitors and processes the temperature information measured by the temperature sensor 6, feeding back the processing results to the signal processing unit 1. The heating component 5 can be a spiral heating tube wound around the temperature sensing cable 2, with the length of the wound temperature sensing cable equal to the standard alarm length of the detector (this length is the minimum heat-bearing length published by the temperature sensing cable manufacturer according to the requirements of GB16280 "Linear Temperature Sensing Fire Detectors"). The temperature sensor 6 is located inside the heating component 5 or between the heating component and the wound temperature sensing cable 2, as long as it can reliably measure the surface temperature of the temperature sensing cable 2.

[0027] This embodiment provides a cable-type heat-sensing fire detector that can periodically and automatically heat the standard alarm length range of the cable-type heat-sensing fire detector to the nominal temperature value as specified in the national standard according to a set detection cycle, and detect a series of basic alarm performance of the cable-type heat-sensing fire detector, such as fixed temperature action, fixed temperature non-action, differential temperature action (if the heat-sensing cable has differential temperature alarm function), and differential temperature non-action.

[0028] Taking the detection of the detector's constant-temperature operation performance as an example, assuming that the signal processing unit 1 is set to perform a test every six months, when the test time is reached, the signal processing unit 1 sends a constant-temperature operation test start signal to the heating controller 4. The heating controller 4 then starts to power on the heating component 5 and determines whether the heating component is working properly based on the temperature change of the heated part measured by the temperature sensor 6. When the measured temperature of the heated part reaches the upper limit of the nominal constant-temperature operation temperature of the temperature sensing cable 2, a heating completion signal is sent to the signal processing unit 1. The signal processing unit 1 then determines whether the constant-temperature alarm performance of the detector in this loop is still in a normal state based on the fire alarm action caused by the change in the resistance of the temperature sensing cable 2 and outputs the corresponding information.

[0029] Similarly, if differential temperature action performance testing is required, signal processing unit 1 sends a differential temperature action test start signal to heating controller 4. Heating controller 4 then powers on heating component 5 and adjusts the power of heating component based on the temperature rise rate of the heated part measured by temperature sensor 6, ensuring that the temperature rise rate of the temperature sensing cable surface is stable within the experimental requirements specified in the national standard. Then, as with the aforementioned constant temperature action test, a judgment and comparison are made to determine whether the differential temperature alarm performance is qualified and corresponding information is output.

[0030] Spiral heating tubes can also be replaced by hinged heating clamps, snap-on heating sleeves, etc. Their common advantage is that they can heat the temperature sensing cable according to the test length given by the national standard (or the minimum heating length corresponding to a specific alarm action temperature published by the detector manufacturer), and can be set at any position along the length of the temperature sensing cable. Only the length of the connecting wire between it and the heating controller needs to be increased, which makes it convenient for users to test any position along the entire length of the temperature sensing cable.

[0031] In this embodiment, the non-recoverable cable-type heat-sensing fire detector must have its automatic heating section removed from the heat-sensing cable after periodic automatic heating detection, and the heat-sensing cable reconnected. Example 2

[0032] like Figure 2 As shown, this embodiment is an improved technical solution based on the technical solution of Embodiment 1. A remote host computer unit is added to achieve remote automatic heating detection of the cable-type heat-sensing fire detector through the automatic heating detection unit. The remote host computer unit is electrically connected to the signal processing unit 1 and the heating controller 4, respectively. The internal structure and connection method of the cable-type heat-sensing fire detector and the automatic heating detection unit are the same as in Embodiment 1. The remote host computer unit 7 includes a remote control module 71 and a display and alarm module 72. When testing is required, the remote control module 71 sends a control command to the heating controller 4, thereby activating the heating component 5. The temperature sensor 6 monitors the temperature change of the heating component 5 and feeds back the real-time temperature to the heating controller 4. The heating controller 4 then feeds back the status information of reaching the test temperature to the remote host computer unit 7. After receiving the fire alarm signal from the signal processing unit 1, the remote host computer unit 7 can determine that the temperature measurement and alarm function of the heat-sensing cable circuit is normal, and then displays and alarms the user through the display and alarm module 72. The aforementioned remote host computer unit 7 can be a fire alarm controller, or a centralized monitoring system such as a user's on-site DCS system or FAS system. Such a centralized monitoring system is easier to program for setting up regular and multiple action performance testing modes.

[0033] The embodiments described above are examples of preferred embodiments of this utility model and are not intended to limit the device. Without affecting the essential nature of this utility model, any changes, modifications, substitutions, combinations, or simplifications of the components in the above embodiments can be made according to actual needs. All such substitutions are equivalent and are included within the protection scope of this utility model. For example, the remote host computer unit 7 is electrically connected to the signal processing unit 1 and / or the heating controller 4, as long as remote monitoring can be achieved. Of course, remote monitoring and control functions can also be achieved simultaneously.

Claims

1. A cable type heat fire detector comprising a heat sensing cable and a signal processing unit and a terminal box connected to both ends of the heat sensing cable, respectively; characterized in that, It also includes an automatic heating detection unit; the automatic heating detection unit includes a heating controller, a heating assembly and a temperature sensor; the heating controller is electrically connected with the signal processing unit, the heating assembly and the temperature sensor respectively; the heating assembly is wound outside any part of the temperature sensing cable; the temperature sensor is arranged inside the heating assembly or between the heating assembly and the wound temperature sensing cable.

2. The cable heat detector according to claim 1, wherein The heating assembly adopts one of a spiral heating pipe, a hinge type heating clamp plate and a buckle type heating sleeve.

3. The cable heat detector according to claim 1 or 2, characterized in that The winding length of the heating assembly is the test length given according to the national standard.

4. The cable heat detector according to claim 1 or 2, characterized in that The cable type temperature sensing fire detector is a recoverable or unrecoverable cable type temperature sensing fire detector.

5. The cable heat detector according to claim 1 or 2, wherein The cable type temperature sensing fire detector also includes a remote host computer unit, which is electrically connected with the signal processing unit, and includes a remote control module and a display alarm module.

6. The cable heat detector according to claim 5, wherein, The remote host computer unit is a fire alarm controller, or a user's on-site DCS system or FAS system.

7. A cable type heat fire detector comprising a heat sensing cable and a signal processing unit and a terminal box connected to both ends of the heat sensing cable, respectively; characterized in that, It also includes an automatic heating detection unit and a remote host computer unit; the automatic heating detection unit includes a heating controller, a heating assembly and a temperature sensor; the heating controller is electrically connected with the signal processing unit, the heating assembly and the temperature sensor respectively; the heating assembly is wound outside any part of the temperature sensing cable; the temperature sensor is arranged inside the heating assembly or between the heating assembly and the wound temperature sensing cable; the remote host computer unit is electrically connected with the signal processing unit and the heating controller respectively, and includes a remote control module and a display alarm module.

8. The cable heat detector according to claim 7, wherein, The remote host computer unit is a fire alarm controller, or a user's on-site DCS system or FAS system.

9. A cable type rate-of-rise heat detector according to claim 7 or 8, characterised in that, The heating assembly adopts one of a spiral heating pipe, a hinge type heating clamp plate and a buckle type heating sleeve.

10. A cable type rate-of-rise heat detector according to claim 7 or 8, characterised in that, The winding length of the heating assembly is the test length given according to the national standard.

11. A cable type rate-of-rise heat detector according to claim 7 or 8, characterised in that, The cable type temperature sensing fire detector is a recoverable or unrecoverable cable type temperature sensing fire detector.

Images