Early warning device for cable well

Abstract

The utility model provides an early warning device for a cable well, belongs to the technical field of cable safety, and aims to solve the problem of poor contact of cable joints monitored on line at present. At present, a detection method mainly detects the temperature of a cable joint, but the actual situation is that the temperature of a cable is obviously increased under the conditions of long time and large load current when the temperature is detected, so that the poor contact of the cable is detected, and the poor contact of the cable joint cannot be effectively monitored. The device comprises a single-chip microcomputer, a power supply module, a cable joint impedance module and an alarm module, wherein the cable joint impedance module and the alarm module are electrically connected to the single-chip microcomputer; the power supply module supplies power to the single-chip microcomputer, the cable joint impedance module and the alarm module. The cable joint impedance module is used for detecting the voltage of a cable joint of two mutually connected cables, generating a signal of the cable joint and feeding back the signal to the single chip microcomputer; the single-chip microcomputer controls on and off of the alarm module according to a signal of the cable joint.

Description

TECHNICAL FIELD

[0001] The utility model belongs to cable safety technical field, more specifically, especially relate to a cable well early warning device. BACKGROUND

[0002] There are a large number of buildings in China, generally need to adopt cable well and distribute main cable power to each floor switch, then distribute switch output to each household meter, so the main cable and floor branch cable connection (hereinafter referred to as cable joint), current is large, quantity is much, after long time use, easy to contact badly, in recent years, cable well fire accidents caused thereby occur from time to time, and the safety hazard is serious.

[0003] At present, there are mainly smoke alarm in fire fighting and electrical parameter detection, cable temperature detection, electrical fire residual current detection in electrical aspect, smoke alarm can only alarm after the accident occurs;

[0004] Electric parameter detection: only through the setting of current overrun, alarm in the cable overload condition;

[0005] Cable temperature detection: only alarm when the cable temperature is over temperature;

[0006] Electrical fire residual current detection: only detect line-to-ground leakage alarm.

[0007] The actual situation of cable well fire is that the cable does not have overload, temperature is not high, and residual current does not have overrun to produce fire. The fundamental reason is that the current online monitoring cable joint contact problem. The current detection method is mainly to detect the temperature of the cable joint, but the actual situation is that the temperature of the cable will rise obviously under the condition of long time, large load current, so that the poor contact of the cable is detected, and therefore the poor contact of the cable head cannot be effectively monitored.

[0008] Therefore, in view of the above, the existing structure and defects are improved, and a cable well early warning device is provided, so as to achieve more practical value. UTILITY MODEL CONTENT

[0009] In order to solve the above technical problems, the utility model provides a cable well early warning device to solve the above technical problems.

[0010] The purpose and effect of the cable well early warning device of the utility model are achieved by the following specific technical means:

[0011] A cable well early warning device, comprising:

[0012] Single-chip microcomputer, power module, cable joint impedance module and alarm module, the cable joint impedance module and alarm module are electrically connected to the single-chip microcomputer.

[0013] The power module supplies power for a single-chip microcomputer, a cable joint impedance module and an alarm module;

[0014] The cable joint impedance module is used for detecting the voltage of the cable joint of two mutually connected cables, generating the signal of the cable joint and feeding back to the single-chip microcomputer.

[0015] The single-chip microcomputer controls the opening and closing of the alarm module according to the signal of the cable joint.

[0016] Preferably, the cable joint impedance module comprises a voltage transformer and an operational amplifier, the voltage transformer and the operational amplifier are electrically connected, the voltage transformer is provided with a first electrical connection end and a second electrical connection end, the first electrical connection end and the second electrical connection end are electrically connected to the two cables of the cable joint respectively, and the operational amplifier is provided with an output end, and the output end is electrically connected to the single-chip microcomputer.

[0017] Preferably, the model of the single-chip microcomputer is STC12C05A08AD.

[0018] Preferably, the device further comprises a flame sensor, and the flame sensor is electrically connected to the single-chip microcomputer.

[0019] Preferably, the device further comprises a temperature sensor, and the temperature sensor is electrically connected to the single-chip microcomputer.

[0020] Preferably, the temperature sensor is a thermistor temperature sensor.

[0021] Preferably, the temperature sensor is a thermal resistance temperature sensor.

[0022] Compared with the prior art, the device has the following beneficial effects:

[0023] In the device, the voltage of the cable joint of two mutually connected cables is detected by the cable joint impedance module, and the single-chip microcomputer analyzes whether the cable joint has a poor contact problem through the voltage. When the voltage change of the cable joint caused by poor contact is found, the single-chip microcomputer controls the alarm module to start. The device judges whether the cable head is in good contact by collecting the voltage at the joint, and the scheme is simple and direct, and the poor contact of the cable head can be judged in time and accurately. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic view of a cable well early warning device.

[0025] Figure 2 is a structural schematic view of a cable well early warning device applied to the cable connection of an actual building.

[0026] Figure 3It is the structural schematic view of the cable joint impedance module in the embodiment one of the utility model.

[0027] In the figure, the corresponding relationship of component name and figure number is:

[0028] The single-chip microcomputer 100, the cable joint impedance module 101, the voltage transformer 1011, the operational amplifier 1012, the first power connection end 1013, the second power connection end 1014, the output end 1015, the flame sensor 102, the temperature sensor 103, the power module 104, and the alarm module 105. DETAILED DESCRIPTION

[0029] The embodiment of the utility model will be further described in detail below in combination with the drawings and the embodiment. The following embodiment is used to illustrate the utility model, but cannot be used to limit the scope of the utility model.

[0030] In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more than two; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the utility model, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0032] Embodiment one:

[0033] As shown in the accompanying drawings: Figure 1 To the accompanying drawings: Figure 3 As shown:

[0034] A cable well early warning device, comprising:

[0035] The single-chip microcomputer 100, the power module 104, the cable joint impedance module 101 and the alarm module 105, the cable joint impedance module 101 and the alarm module 105 are electrically connected to the single-chip microcomputer 100;

[0036] The power module 104 supplies power for the single-chip microcomputer 100, the cable joint impedance module 101 and the alarm module 105.

[0037] The cable joint impedance module 101 is used for detecting the voltage of the cable joint of two mutually connected cables, generating the signal of the cable joint and feeding back to the single-chip microcomputer 100.

[0038] The single-chip microcomputer 100 controls the opening and closing of the alarm module 105 according to the signal of the cable joint.

[0039] In the embodiment, the voltage of the cable joint of two mutually connected cables is detected by the cable joint impedance module 101, and the single-chip microcomputer 100 analyzes whether the cable joint has the problem of poor contact through the voltage. When the voltage change of the cable joint with poor contact is found, the single-chip microcomputer 100 controls the alarm module 105 to start. The alarm module 105 is a buzzer, a flashing light or an electromagnetic relay contact output.

[0040] In the power-on working state of the cable joint, the specific contact resistance is calculated through the collection of the voltage difference at both ends of the cable joint and the collection of the current, and the contact failure is judged by using the characteristics of the photoelectric coupler, the voltage-sensitive and all other components that will cause the output to change when the input voltage difference. The essence of all the above is to judge whether the joint is in good contact by using the voltage difference at both ends of the cable joint, which is the same as the principle of the present scheme.

[0041] The cable joint impedance module 101 comprises a voltage transformer 1011 and an operational amplifier 1012, and the voltage transformer 1011 and the operational amplifier 1012 are electrically connected. The voltage transformer 1011 is provided with a first electrical connection end 1013 and a second electrical connection end 1014, and the first electrical connection end 1013 and the second electrical connection end 1014 are electrically connected to the two cables of the cable joint respectively. The operational amplifier 1012 is provided with an output end 1015, and the output end 1015 is electrically connected to the single-chip microcomputer 100.

[0042] In the power-on working state of the cable joint, the direct voltage at the cable joint is used to judge whether the contact is good, or the contact voltage and the current are collected to calculate the specific value of the contact resistance to judge whether the cable joint is in good contact, or the voltage comparator, the photoelectric coupler, the voltage-sensitive and all other components that will cause the output to change when the input voltage changes are used to judge the contact failure.

[0043] The single-chip microcomputer 100 is STC12C05A08AD.

[0044] The flame sensor 102 is also included, and the flame sensor 102 is electrically connected to the single-chip microcomputer 100.

[0045] The detection is achieved by utilizing the spectral characteristics of flames. Flames produce a specific spectrum during combustion, including visible and infrared light. By detecting this spectrum, the flame sensor can determine the presence of a flame and output a signal to the microcontroller interface circuit. Furthermore, alarm and fire extinguishing devices can be incorporated to achieve fire alarm or automatic fire suppression functions.

[0046] It also includes a temperature sensor 103, which is electrically connected to the microcontroller 100.

[0047] Temperature sensor 103 is a thermistor temperature sensor. Thermistor temperature sensors have the advantages of high sensitivity, small size, low cost, and low thermal inertia. The data detected by temperature sensor 103 is processed by a microcontroller to calculate the corresponding temperature value.

[0048] Example 2:

[0049] The remaining features are the same as in Embodiment 1, except that the temperature sensor 103 in this embodiment is replaced by a resistance temperature detector (RTD) sensor. RTD sensors have the advantages of high measurement accuracy, good stability, wide temperature range, and strong moisture resistance.

[0050] The specific usage and function of this embodiment are as follows:

[0051] When using this utility model, such as Figure 2 The application shown is in the detection of cable joints in ordinary buildings (including but not limited to applications in ordinary buildings, industrial and commercial buildings, factories, mines, hospitals, schools, etc., where it is necessary to monitor the contact of cable joints). The first terminal 1013 and the second terminal 1014 of the cable joint impedance module 101 are electrically connected to the main cable of the floor branch cable box and power well of the cable joint, respectively. The cable joint impedance module 101 feeds back the detected voltage value to the microcontroller 100. The microcontroller analyzes and judges whether there is poor contact. If poor contact is found, the microcontroller 100 activates the alarm module to sound an alarm.

[0052] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A cable pit early warning device, characterized in that, The application relates to a cable joint impedance monitoring device, which comprises the following parts: a single-chip microcomputer (100), a power module (104), a cable joint impedance module (101) and an alarm module (105), wherein the cable joint impedance module (101) and the alarm module (105) are electrically connected to the single-chip microcomputer (100); the power module (104) supplies power to the single-chip microcomputer (100), the cable joint impedance module (101) and the alarm module (105); the cable joint impedance module (101) is used for detecting the voltage of the cable joint of two mutually connected cables, generating a cable joint signal and feeding back to the single-chip microcomputer (100); and the single-chip microcomputer (100) controls the opening and closing of the alarm module (105) according to the cable joint signal. The cable joint impedance module (101) comprises a voltage transformer (1011) and an operational amplifier (1012), the voltage transformer (1011) and the operational amplifier (1012) are electrically connected, the voltage transformer (1011) is provided with a first electric connection end (1013) and a second electric connection end (1014), the first electric connection end (1013) and the second electric connection end (1014) are respectively electrically connected to the two cables of the cable joint, the operational amplifier (1012) is provided with an output end (1015), and the output end (1015) is electrically connected to the single-chip microcomputer (100). The single-chip microcomputer (100) is of STC12C05A08AD type. The device further comprises a flame sensor (102), and the flame sensor (102) is electrically connected to the single-chip microcomputer (100). The device further comprises a temperature sensor (103), and the temperature sensor (103) is electrically connected to the single-chip microcomputer (100).

2. A cable pit early warning device as claimed in claim 1, characterised in that: The temperature sensor (103) is a thermistor temperature sensor.

3. A cable pit early warning device as claimed in claim 1, characterised in that: The temperature sensor (103) is a thermal resistance temperature sensor.

4. A cable pit early warning device as claimed in claim 1, characterised in that: ​ 5. A cable pit early warning device as claimed in claim 1, characterised in that: ​ 6. A cable pit early warning device as claimed in claim 5, characterised in that: ​ 7. A cable pit early warning device as claimed in claim 5, characterised in that: ​

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