Leakage locking unit

Abstract

The utility model provides a leakage locking unit, belongs to the field of insulation detection of coal mine electrical equipment, and particularly relates to a leakage locking unit. A leakage locking unit comprises a shell, a substrate and a circuit board located in the shell, the bottom of the shell is fixedly connected to the substrate, and the substrate is used for fixing the shell in a monitoring circuit; an indicating lamp and a spring wiring terminal are correspondingly embedded in two sides of the top of the shell, a dial switch is arranged on the top of the shell on one side where the indicating lamp is located and used for selecting voltage grades, and 24 wiring terminals are arranged on the side face of the shell and used for being connected with electrical equipment. According to the technical scheme of the utility model, the circuit board for earth leakage lockout detection is packaged in the unit module, and the wiring terminal is arranged outside the shell of the unit module, so that the small size and modular design of the earth leakage lockout unit are realized, and meanwhile, the earth leakage lockout unit is encapsulated by the electronic glue, so that the stability and safety of the earth leakage lockout unit module are improved.

Description

Technical Field

[0001] The utility model relates to the field of insulation detection of power supply circuits, in particular to a leakage locking unit. Background Art

[0002] Coal mines have limited space and a humid environment in underground tunnels, which can easily cause moisture to enter coal mine electrical equipment, leading to leakage accidents. Therefore, coal mine electrical equipment with external power supply circuits needs to be equipped with a leakage lockout function. Existing leakage lockout devices all use contactor auxiliary contacts to disconnect high voltage. When leakage is detected, the contactor auxiliary contacts operate to cut off the power supply, achieving leakage lockout. Because contactor auxiliary contacts are easily worn out during frequent opening and closing operations, they can cause poor contact or failure, which in turn affects the reliability of the leakage lockout function. If the leakage lockout device fails to operate in a timely manner or operates inaccurately, the leakage fault may not be interrupted in time, increasing the risk of electric shock and equipment damage. In addition, because the main contacts may be affected by arc connection or residual magnetic potential of the motor when disconnecting, the leakage lockout detection circuit needs to be delayed to prevent high voltage from entering the detection circuit and causing damage. This prolongs the leakage detection time and reduces the system's response speed. In some special cases, such as when the distributed capacitance of the power grid to the ground is large, the traditional leakage locking device may not be able to accurately judge the leakage fault, causing the leakage locking module to malfunction or refuse to operate, seriously affecting production safety and production efficiency.

[0003] Traditional leakage locking devices are bulky, difficult to fix, and cannot be used in applications with vibration. Utility Model Content

[0004] The main purpose of the utility model is to provide a leakage locking unit to solve the problems in the prior art of poor safety of coal mine leakage detection and the large size of the leakage locking device which is difficult to install and fix.

[0005] To achieve the above-mentioned purpose, the utility model provides a leakage locking unit, including a shell, a substrate and a circuit board located inside the shell, the bottom of the shell is fixedly connected to the substrate, and the substrate is used to fix the shell in the power supply circuit; an indicator light is embedded in the left side of the top plane of the shell, a spring terminal is embedded in the right side of the top plane of the shell, and 24 terminal blocks for connecting coal mine electrical equipment are embedded in the left side of the shell.

[0006] Furthermore, the inside of the shell is potted with electronic glue to protect the circuit board inside the shell.

[0007] Furthermore, there are two spring terminals, namely a grounding terminal and a high-voltage terminal. The grounding terminal is used to ground the locking unit, and the high-voltage terminal is used to connect the locking unit to a high-voltage circuit.

[0008] Furthermore, there are two indicator lights, namely a power indicator light and a signal indicator light. The power indicator light is used to display the power supply status of the unit module, and the signal indicator light is used to display the locking status of the unit.

[0009] Furthermore, the 24-terminal block has a total of eight terminals, which are divided into two rows, the upper and lower rows. The four terminals in the upper row are respectively a positive voltage terminal, a negative power supply terminal, a signal control terminal, and a device control terminal. The terminals in the lower row correspond to the terminals in the upper row. The positive voltage terminal is used to connect the locking unit to a 24-volt positive power supply, the negative voltage terminal is used to connect the locking unit to a 24-volt negative power supply, the signal control terminal is used to receive external control signal input and output control signals to external devices, and the device control terminal is used to control the start and stop of the locking unit.

[0010] Furthermore, the base plate is provided with two extensions on both sides of the shell, and each extension is provided with at least two fixing holes, through which the leakage locking unit is fixed in the power supply circuit.

[0011] Furthermore, a dip switch is embedded in the top plane of the shell on the right side of the signal indicator light for selecting the voltage level.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The shell of the present invention is made of insulating material, and the internal circuit and high-voltage part used to detect the insulation condition of the power supply circuit of coal mine electrical equipment are encapsulated inside the shell. The unit module is fixed in the mine electrical equipment through the base plate, realizing a small-volume, modular design of the leakage lockout device, which is convenient for the fixed installation of the leakage protection unit. The leakage lockout unit provided by the present invention first fixes the circuit board inside the shell, and then fills it with electronic glue. The filling glue has good adhesion to the circuit board and electronic components, which can prevent the electronic components from loosening or falling off during vibration, thereby ensuring the operation of the equipment. When the leakage lockout unit is subjected to vibration and impact, the cured electronic glue can absorb and disperse external forces, maintain the stability of the circuit equipment, and enable the leakage lockout unit to be used stably for a long time.

[0014] By installing terminals on the outside of the housing to bolt the ground wire and high-voltage wire to the leakage lockout protection unit, frequent opening and closing operations can prevent electric shock, wear, poor contact, or failure, thereby improving equipment operation safety. Indicator lights can also visually reflect the power supply and lockout status of the leakage lockout unit, facilitating leakage detection and maintenance for personnel, ensuring construction safety and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0016] Figure 1 The figure shows the overall structure of a leakage locking unit of the present invention.

[0017] Among them, the figure numbers in the above drawings are:

[0018] 1. Housing; 2. Base plate; 3. Indicator light; 4. Spring terminal; 5. DIP switch; 6. 24-pin terminal; 31. Power indicator light; 32. Signal indicator light; 41. Ground terminal; 42. High-voltage terminal. DETAILED DESCRIPTION

[0019] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0020] like Figure 1 The illustrated leakage lockout unit comprises a housing 1, a base plate 2, and a circuit board located within the housing. The bottom of the housing 1 is connected to the base plate 2, which is used to secure the housing 1 within the power supply circuit. An indicator light 3 is embedded on the left side of the top plane of the housing 1, a spring-loaded terminal block 4 is embedded on the right side of the top plane of the housing 1, and 24-way terminals 6 for connecting to coal mine electrical equipment are embedded on the left side of the housing 1. The circuit board of the leakage lockout module is secured within the housing 1. The spring-loaded terminal blocks 4 and 24-way terminals 6 are provided on the exterior of the housing 1 to connect the leakage lockout unit to the power supply circuit of the coal mine electrical equipment. The indicator light 3 displays the power supply and lockout status of the leakage lockout unit, and the base plate 2 is used to secure the leakage lockout unit.

[0021] Specifically, the interior of the housing 1 is potted with electronic glue to protect the circuit board inside the housing 1. Fixing the circuit board inside the housing 1 first and then potting with electronic glue can play a role in shock resistance, so that the leakage locking unit module can be used in scenes with vibration.

[0022] Specifically, there are two spring terminals 4: a ground terminal 41 and a high-voltage terminal 42. Ground terminal 41 is used to ground the locking unit, while high-voltage terminal 42 is used to connect the locking unit to the high-voltage circuit. Both ground terminal 41 and high-voltage terminal 42 are terminal blocks for single-pole air switches. They have a single terminal head, consisting of a contact and an insulator. The contact is used to securely connect to the ground wire or high-voltage wire, typically using a threaded connection. The insulator supports and protects the contact.

[0023] Specifically, there are two indicator lights 3: a power indicator light 31 and a signal indicator light 32. The power indicator light 31 is used to display the power supply status of the unit module, and the signal indicator light 32 is used to display the unit lock status. When the power indicator light 31 is in normal working condition, it lights up, indicating that the leakage lock unit is connected to the power supply and the power supply is normal. When the light is off, it indicates that the power supply is not successfully connected. When the signal indicator light 32 is in normal working condition, it lights up, indicating that the power supply circuit is in the locked state. The leakage lock unit cuts off the circuit power supply, and the insulation condition of the power supply circuit should be checked for leakage. If the light is off, it indicates that the insulation condition of the power supply circuit is normal.

[0024] Specifically, the 24-terminal block 6 has eight terminals, divided into two rows, upper and lower. The four terminals in the upper row are respectively a positive voltage terminal, a negative power terminal, a signal control terminal, and a device control terminal. The terminals in the lower row correspond to the terminals in the upper row. The positive voltage terminal is used to connect the locking unit to a 24-volt positive power supply, the negative voltage terminal is used to connect the locking unit to a 24-volt negative power supply, the signal control terminal is used to receive external control signals and output control signals to external devices, and the device control terminal is used to control the start and stop of the locking unit. The 24-terminal block connects the leakage locking unit to the power supply, detection circuit, and coal mine electrical equipment. The positive voltage terminal and negative power terminal are used to connect to a DC power supply to power the leakage locking unit. The signal control terminal and device control terminal are used to connect to the monitoring electrical system, and the locking state of the unit is determined by monitoring the insulation resistance of the electrical system.

[0025] Furthermore, the base plate 2 is provided with two extensions on both sides of the housing 1 , and each extension is provided with at least two fixing holes, through which the leakage locking unit is fixed in the power supply circuit.

[0026] Furthermore, a DIP switch 5 is embedded in the top plane of the housing 1 to the right of the signal indicator 32, which is used to select the voltage level. The voltage levels are 1140V and 660V, and the corresponding leakage lockout values ​​are different for different voltage levels: 40kΩ for 1140V and 22kΩ for 660V.

[0027] The specific working state of the leakage locking unit provided by the utility model is as follows:

[0028] After the relevant technical personnel put on safety protection equipment (such as insulating gloves and insulating shoes), they cut off the power to the electrical equipment in the coal mine and set up a "Do not close the switch" warning sign at the corresponding location. Then they check the insulation of the grounding wire and high-voltage wire, and check the stability and insulation of the leakage protection unit terminal. After the inspection is correct, the leakage protection unit is fixed to the corresponding monitoring position through the base plate 2 and bolts. After securing, strip an appropriate length of insulation from one end of the grounding wire to expose the copper core. Connect the grounding wire to the grounding terminal 41 of the leakage protection unit via a bolt. After confirming that the grounding wire is correctly connected, connect the high-voltage wire and secure one end of the high-voltage wire to the high-voltage terminal 42. Check the insulation and stability of the grounding terminal 41 and the high-voltage terminal 42. After confirming that they are correct, select the voltage level using the DIP switch 5. Connect the power to the leakage protection unit through the 24-terminal connection. The power indicator 31 will light up, and the leakage protection unit will be connected to the electrical equipment. For an 1140V power grid, the unit will lock when the leakage protection unit detects that the insulation resistance of the power supply circuit has dropped below 40kΩ. For a 660V power grid, the unit will lock when the leakage protection unit detects that the insulation resistance of the power supply circuit has dropped below 22kΩ. When the leakage protection unit is locked, the power supply circuit is disconnected and the signal indicator 32 will light up. Insulation testing and maintenance of the electrical equipment and power supply circuit are required.

[0029] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A leakage locking unit, characterized in that: The invention comprises a shell (1), a base plate (2) and a circuit board located inside the shell (1); the bottom of the shell (1) is fixedly connected to the base plate (2); the base plate (2) is used to fix the shell (1) in a power supply circuit; an indicator light (3) is embedded on the left side of the top plane of the shell (1); a spring terminal (4) is embedded on the right side of the top plane of the shell (1); and a 24-wire terminal (6) for connecting coal mine electrical equipment is embedded on the left side of the shell (1).

2. A leakage locking unit according to claim 1, characterized in that: The interior of the housing (1) is potted with electronic glue to protect the circuit board inside the housing (1).

3. A leakage locking unit according to claim 2, characterized in that: There are two spring connection terminals (4), namely a grounding terminal (41) and a high-voltage terminal (42). The grounding terminal (41) is used to ground the locking unit, and the high-voltage terminal (42) is used to connect the locking unit to a high-voltage circuit.

4. A leakage locking unit according to claim 3, characterized in that: There are two indicator lights (3), namely a power indicator light (31) and a signal indicator light (32). The power indicator light (31) is used to display the power supply status of the unit module, and the signal indicator light (32) is used to display the unit locking status.

5. The leakage locking unit according to claim 4, characterized in that: The 24-terminal block (6) has eight terminals in total, which are divided into two rows, the upper and lower rows. The four terminals in the upper row are respectively a positive voltage terminal, a negative power terminal, a signal control terminal, and a device control terminal. The terminals in the lower row correspond to the terminals in the upper row. The positive voltage terminal is used to connect the locking unit to a 24-volt positive power supply, the negative voltage terminal is used to connect the locking unit to a 24-volt negative power supply, the signal control terminal is used to receive an external control signal input and output a control signal to an external device, and the device control terminal is used to control the start and stop of the locking unit.

6. The leakage locking unit according to claim 5, characterized in that: The base plate (2) is provided with two extensions on both sides of the housing (1), and each extension is provided with at least two fixing holes, through which the leakage locking unit is fixed in the power supply circuit.

7. The leakage locking unit according to claim 6, characterized in that: A dial switch (5) is embedded in the top plane of the housing (1) on the right side of the signal indicator light (32) for selecting the voltage level.

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