Low voltage motor on-line insulation monitor

Abstract

The utility model discloses low -voltage motor on -line insulation monitor, including casing and front cover, the rear side of casing is equipped with a plurality of safety buckle, the vertical control board of being equipped with in the casing, the rear side fixedly connected with circuit board of control board, the front side of control board is equipped with display screen, a plurality of contact, a plurality of terminal and pilot lamp, be equipped with the rectangular mouth of adapting with display screen on the front cover, the front side of front cover is equipped with a plurality of control button corresponding with contact, the round hole of adapting with pilot lamp and the lower through -hole and upper through -hole of adapting with terminal, this monitor has the advantages such as reasonable in structure design, good protection effect, convenient installation and maintenance, can satisfy the demand of real -time, accurate, safe monitoring of industrial field to low -voltage motor insulation state.

Description

Technical Field

[0001] This utility model relates to the field of insulation testing instruments, and in particular to an online insulation monitoring instrument for low-voltage motors. Background Technology

[0002] Low-voltage motors are widely used as core power equipment in industrial production, power supply, and infrastructure construction. Their operational stability directly determines the reliability of the entire production system or power supply network. The insulation performance of low-voltage motors is a key indicator for ensuring their safe operation. If the motor insulation layer ages, is damaged, or becomes damp, it can not only lead to motor malfunction and shutdown but also cause safety accidents such as short circuits and leakage, resulting in equipment damage, production interruptions, and even endangering the personal safety of operators. Therefore, real-time and effective online insulation monitoring of low-voltage motors is of great significance.

[0003] Currently, there are various low-voltage motor insulation monitoring devices on the market, but they have significant shortcomings in practical application adaptability. Regarding the ease of installation and maintenance, traditional monitors often use bolts to fix the housing and front cover, requiring specialized tools for disassembly, which is cumbersome. When it is necessary to repair or replace these components or internal control boards and circuit boards, the traditional fixing method leads to long disassembly time, further extending the motor's downtime for monitoring and increasing production losses for enterprises. At the same time, the installation of internal circuit boards in some monitors often uses welding or multiple sets of screws, making disassembly difficult during subsequent maintenance and easily damaging the delicate circuit components in the insulation monitor, reducing the secondary utilization rate of components.

[0004] Therefore, it is necessary to design an online insulation monitoring instrument for low-voltage motors to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing an online insulation monitoring instrument for low-voltage motors. This monitoring instrument has the advantages of reasonable structural design, good protection effect, and convenient installation and maintenance, and can meet the needs of industrial sites for real-time, accurate, and safe monitoring of the insulation status of low-voltage motors.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A low-voltage motor online insulation monitoring instrument includes a housing and a front cover. The rear side of the housing is provided with multiple safety buckles. A control board is vertically arranged inside the housing. A circuit board is fixedly connected to the rear side of the control board. The front side of the control board is provided with a display screen, multiple contacts, multiple terminals, and indicator lights. The front cover is provided with a rectangular opening adapted to the display screen. The front side of the front cover is provided with multiple control buttons corresponding to the contacts, round holes adapted to the indicator lights, and lower and upper through holes adapted to the terminals.

[0008] Preferably, the front cover has strip-shaped openings on both the upper and lower sides.

[0009] Preferably, multiple elastic buckles are fixedly connected to both the left and right sides of the front cover, and the front and rear side walls of the housing are provided with buckle holes that cooperate with the elastic buckles.

[0010] Preferably, the front sides of the housing are provided with multiple heat dissipation holes.

[0011] Preferably, multiple sets of slide rails are fixedly connected to the inner walls of the front and rear sides of the housing, and the circuit board is located in the two middle slide rails and is slidably connected to the inner wall of the slide rails.

[0012] Preferably, the elastic buckle is made of PP plastic.

[0013] Compared with existing technologies, the advantages of this device are:

[0014] 1. Compared with existing technologies, this device has significant advantages in structural protection and ease of installation and maintenance: the front cover is connected to the housing through elastic buckles and housing holes, replacing the traditional bolt fixing, and can be quickly disassembled without professional tools, which facilitates the inspection and maintenance of core components such as internal DC injection lines and interlocking control modules; the circuit board is slidably installed through the sliding rail inside the housing, avoiding the cumbersome welding or multiple sets of screws, reducing the risk of component damage during maintenance, and improving the secondary utilization rate;

[0015] 2. Compared with existing technologies, this device is more competitive in terms of operational stability and user experience: Multiple heat dissipation holes are provided on both sides of the front of the housing, which can quickly dissipate the heat generated by the DC injection line and interlocking control module during operation, and prevent the internal temperature of the housing from being too high and affecting the performance of the components; the front cover is printed with wear-resistant ink markings for the control buttons, terminal interfaces, and indicator lights, and is covered with a scratch-resistant protective film. This not only makes it easy for operators to quickly identify functions such as interlocking control and three-way motor switching, reducing the error rate of operation under complex working conditions, but also prevents the markings from wearing off, keeping them clear and easy to read for a long time, thus combining practicality and aesthetics. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the online insulation monitoring instrument for low-voltage motors proposed in this utility model;

[0017] Figure 2 for Figure 1 A schematic diagram of the rear structure;

[0018] Figure 3 for Figure 1 Exploded view.

[0019] In the diagram: 1. Housing, 2. Front cover, 3. Display screen, 4. Rectangular opening, 5. Control buttons, 6. Lower through hole, 7. Upper through hole, 8. Indicator light, 9. Heat dissipation hole, 10. Card hole, 11. Safety buckle, 12. Strip opening, 13. Control board, 14. Terminal, 15. Circuit board, 16. Slide rail, 17. Elastic buckle. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Reference Figures 1-3 The low-voltage motor online insulation monitoring instrument includes a housing 1 and a front cover 2. The housing 1 is injection molded from ABS engineering plastic, which has good impact resistance and insulation performance. The front cover 2 is adapted to the outline of the housing 1 and is also made of ABS engineering plastic. The outer surface of the front cover 2 is frosted, which can effectively improve the anti-slip effect during operation. There are multiple safety buckles 11 on the rear side of the housing 1, with a total of 4 safety buckles 11. A control board 13 is vertically installed inside the housing 1. A circuit board 15 is fixedly connected to the rear side of the control board 13. The front side of the control board 13 has a display screen 3, multiple contacts, multiple terminals 14, and indicator lights 8. The display screen 3 is an LCD liquid crystal display. There are 9-12 terminals 14, which are divided into 3 groups corresponding to the connection of three motors. Each group of terminals 14 includes 3 wiring terminals (live wire terminal, neutral wire terminal, etc.). Terminals 14 are made of brass and each terminal 14 has an M2 fixing screw. There are four indicator lights 8, including a power indicator, a running indicator and a 3-channel motor monitoring indicator. The front cover 2 has a rectangular opening 4 that matches the display screen 3. The front side of the front cover 2 has multiple control buttons 5 corresponding to the contacts, round holes that match the indicator lights 8, and lower through holes 6 and upper through holes 7 that match the terminals 14. The number of control buttons 5 is the same as the number of contacts. The control buttons 5 are silicone buttons with function markings printed on the top. The bottom of the control buttons 5 is precisely aligned with the contacts. When pressed, the contact signal can be stably triggered. The number of lower through holes 6 and upper through holes 7 is the same as the number of terminals 14, corresponding to the upper and lower positions of the fixing screws on the terminals 14, which facilitates the screwdriver to be inserted from different angles.

[0022] The front cover 2 has strip-shaped openings 12 on both the top and bottom sides, and the housing 1 has multiple heat dissipation holes 9 on both the front sides.

[0023] The front cover 2 has multiple elastic buckles 17 fixedly connected to both the left and right sides. The front and rear side walls of the housing 1 are provided with locking holes 10 that cooperate with the elastic buckles 17. The elastic buckles 17 are made of PP plastic material and have good elastic recovery performance. The end of the buckle is provided with a triangular locking block to facilitate locking with the locking hole 10.

[0024] The inner walls of the front and rear sides of the housing 1 are fixedly connected to multiple sets of slide rails 16, and the circuit board 15 is located in the two middle slide rails 16 and is slidably connected to the inner wall of the slide rails 16.

[0025] The functional principle of this utility model can be explained through the following operation: First, the equipment initialization and connection operation is performed. The operator needs to connect the monitor housing 1 to the adapter power supply and complete the wiring connection. Then, the motor wiring and terminal 14 are connected. The cables or windings of the three low-voltage motors to be monitored are inserted from the strip openings 12 on the upper and lower sides of the front cover and aligned with the terminal 14 on the control board 13. Then, a screwdriver is inserted through the lower through hole 6 or the upper through hole 7 of the front cover, and the screw on the terminal 14 is rotated to loosen the interface. After the motor cable or winding is connected to the terminal 14, the screwdriver is used to rotate the screw in the opposite direction through the same lower through hole 6 or the upper through hole 7 to tighten the terminal 14 interface and complete the wiring fixation. After that, the monitor is connected to the circuit contactor or circuit breaker auxiliary contact in the motor circuit for interlocking wiring to ensure that the interlocking control function can be triggered normally. Then, the control button 5 on the front cover is pressed, the equipment is powered on and initialized, the control board 13 starts the self-test program, the indicator light 8 lights up to indicate that the equipment has entered the standby state, and the display screen 3 displays the initialization interface simultaneously.

[0026] Once the monitoring phase begins, the device can intelligently switch between monitoring states: When the motor circuit needs to be powered on, the auxiliary contacts of the circuit contactor or circuit breaker will trigger an interlock signal. This signal is transmitted to the circuit board 15 on the back of the control board 13. After processing by the circuit board 15, it is fed back to the control board 13. The control board 13 immediately controls the insulation monitoring module to exit operation, realizing the automatic separation of the monitor from the power grid and avoiding interference between the monitoring circuit and the power grid. At this time, the display screen 3 shows the "Motor running, monitoring paused" status, and the indicator light 8 corresponding to the running status remains constantly lit. When the motor circuit is de-energized and stops running, the auxiliary contact interlock signal is disconnected, and the circuit board 15 transmits the power-off signal to the control board 13. The control board 13 then automatically starts the insulation monitoring module, applying a stable DC 500VDC test voltage to the cables or windings of the three motors using the DC injection method, and starting real-time insulation monitoring. The display screen 3 switches to the monitoring interface, and the indicator light 8 flashes to indicate that monitoring is in progress.

[0027] During the monitoring process, multi-channel monitoring and data viewing are convenient and efficient: the control board 13 collects the insulation data of the three motors in real time and transmits the data to the circuit board 15 for analysis and processing. The processed insulation resistance value, monitoring status and other information will be displayed on the display screen 3. The operator can switch the display interface of the display screen 3 through the function control buttons on the front cover 2 to flexibly view the detailed monitoring data of a single motor or the summary data of the three motors. If the insulation data of a certain motor is abnormal, the control board 13 will trigger the corresponding indicator light 8 to change to a warning color (such as red), and the display screen 3 will pop up an abnormal prompt message to help the operator quickly locate the faulty motor.

[0028] When it is necessary to maintain the equipment or adjust the monitoring parameters, the operation process is simple and does not require complicated tools: the operator can directly press the elastic buckles 17 on the left and right sides of the front cover 2 to disengage the buckles from the locking holes 10 of the housing 1, and the front cover 2 can be removed to expose the control board 13 and the circuit board 15 on the rear side; if the circuit board 15 needs to be repaired, the circuit board 15 can be smoothly pulled out along the slide rails 16 on the front and rear inner walls of the housing 1 to avoid damage to the components caused by forced disassembly.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A low-voltage motor online insulation monitoring instrument, comprising a housing (1) and a front cover (2), characterized in that: The rear side of the housing (1) is provided with multiple safety buckles (11). The housing (1) is vertically provided with a control board (13). The rear side of the control board (13) is fixedly connected with a circuit board (15). The front side of the control board (13) is provided with a display screen (3), multiple contacts, multiple terminals (14) and indicator lights (8). The front cover (2) is provided with a rectangular opening (4) adapted to the display screen (3). The front side of the front cover (2) is provided with multiple control buttons (5) corresponding to the contacts, round holes adapted to the indicator lights (8), and lower through holes (6) and upper through holes (7) adapted to the terminals (14).

2. The low-voltage motor online insulation monitoring instrument according to claim 1, characterized in that: The front cover (2) has strip-shaped openings (12) on both the upper and lower sides.

3. The low-voltage motor online insulation monitoring instrument according to claim 1, characterized in that: The front cover (2) is fixedly connected to multiple elastic buckles (17) on both the left and right sides, and the front and rear side walls of the housing (1) are provided with buckle holes (10) that cooperate with the elastic buckles (17).

4. The low-voltage motor online insulation monitoring instrument according to claim 1, characterized in that: The front sides of the housing (1) are provided with multiple heat dissipation holes (9).

5. The low-voltage motor online insulation monitoring instrument according to claim 1, characterized in that: Multiple sets of slide rails (16) are fixedly connected to the inner walls of the front and rear sides of the housing (1). The circuit board (15) is located in the two middle slide rails (16) and is slidably connected to the inner wall of the slide rails (16).

6. The low-voltage motor online insulation monitoring instrument according to claim 3, characterized in that: The elastic buckle (17) is made of PP plastic.

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