Circuit structure for quickly judging quality of multiple parallel motors and quickly adjusting phase sequence of motors

Abstract

The utility model discloses a circuit structure for quickly judging the quality of a plurality of parallel motors and quickly adjusting the phase sequence of the motors, which comprises a plurality of three-phase motors, a circuit protector, an isolating switch, an operation contactor and a power switch, all the three-phase motors are connected in parallel, the wiring end of each three-phase motor is connected with the first end of the isolating switch, and the wiring end of each three-phase motor is connected with the second end of the isolating switch. The second end of the isolating switch is connected with the first ends of the circuit protectors, the isolating switch, the three-phase motor and the circuit protectors are in one-to-one correspondence, the second ends of all the circuit protectors are connected with the first end of the operation contactor, the second end of the operation contactor is connected with the first end of the power switch, and the second end of the power switch is connected with an external power supply. The circuit structure can quickly find out the burnt motor, and can directly adjust the phase sequence of the motor on the isolating switch, thereby saving time and labor.

Description

Technical Field

[0001] This utility model relates to the field of electrical technology, specifically a circuit structure for quickly determining the condition of multiple parallel motors and quickly adjusting the phase sequence of the motors. Background Technology

[0002] In our company, blast furnace pulverized coal injection and trough areas utilize hoppers and vibrating screens for material feeding. Different raw materials have varying moisture content, frequently causing blockages. This necessitates multiple vibrators to vibrate the hopper walls and vibrating screens for feeding, with multiple vibrating motors operating in parallel (e.g., Figure 2 (As shown) There are several drawbacks:

[0003] 1) One of the vibration motors burned out, affecting the operation of all motors.

[0004] 2) Several motors are connected together, and there is only one cable connector on site, making it difficult to determine which one has burned out.

[0005] 3) Adjusting the phase sequence of one of the motors is difficult. It requires opening the cable connector, locating the motor, readjusting the phase sequence, and then rewiring, which is time-consuming and laborious. Utility Model Content

[0006] The purpose of this invention is to provide a circuit structure for quickly determining the condition of multiple parallel motors and quickly adjusting the phase sequence of the motors, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a circuit structure for quickly determining the condition of multiple parallel motors and quickly adjusting the phase sequence of the motors, comprising multiple three-phase motors, a circuit protector, a disconnecting switch, a running contactor, and a power switch. All three-phase motors are connected in parallel. The terminals of each three-phase motor are connected to the first terminal of the disconnecting switch. The second terminal of the disconnecting switch is connected to the first terminal of the circuit protector. The disconnecting switch, the three-phase motors, and the circuit protector are in one-to-one correspondence. The second terminal of all circuit protectors is connected to the first terminal of the running contactor. The second terminal of the running contactor is connected to the first terminal of the power switch. The second terminal of the power switch is connected to an external power source.

[0008] Preferably, all circuit protectors are installed together in an isolated distribution box located near the three-phase motor.

[0009] Preferably, the circuit protector is an air switch or a motor protection switch.

[0010] Preferably, the rated power of the three-phase motor is 0.75kw.

[0011] Preferably, the external power supply is a 380V three-phase power supply.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] This utility model provides a circuit structure for quickly determining the condition of multiple parallel motors and rapidly adjusting their phase sequence. The circuit protection device can quickly identify burnt-out motors, and the disconnect switch allows for direct adjustment of the motor phase sequence, saving time and effort. Attached Figure Description

[0014] Figure 1 The improved circuit structure diagram;

[0015] Figure 2 The circuit diagram before the improvement.

[0016] In the diagram: 1. Power switch; 2. Running contactor; 3. Circuit protection device; 4. Disconnecting switch; 5. Three-phase motor. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] like Figure 1 As shown, multiple three-phase motors 5 operate in parallel. When one motor burns out, a short circuit or other fault may occur, causing a sharp increase in the current of that branch. Due to the characteristics of parallel circuits, the total current will be redistributed, reducing the current in the branches of other normally functioning motors, causing the three-phase motors 5 in other branches to malfunction. All three-phase motors 5 will stop working simultaneously, and it will be impossible to immediately identify which motor(s) failed; a step-by-step investigation is required.

[0019] To avoid the above situation, the following was designed: Figure 2 The circuit structure shown is shown. Figure 2 The terminals of the three-phase motor 5 are connected to the isolating switch 4 via wires. The leads of the isolating switch 4 are connected to the circuit protection device 3. The circuit protection device 3 can be an air switch or a motor switch. When the three-phase motor 5 burns out, the air switch or motor switch will disconnect, thus providing protection. The air switch or motor switch is generally installed in the isolation distribution box. The leads from the air switch or motor switch pass out of the isolation distribution box and are connected to the running contactor 2. The leads from the running contactor 2 are connected to the power switch 1. The power switch 1 is electrically connected to the power supply.

[0020] The running contactor 2 is mainly used to connect and disconnect control circuits. It can work with sensors, timers, etc., to achieve automated control and automatic motor start / stop. The running contactor 2 is often used in conjunction with circuit protection devices 3 (such as air switches and motor switches) to automatically cut off the circuit in case of overload, short circuit, or other faults, protecting equipment and personnel safety.

[0021] Working principle: When the three-phase motor 5 burns out, its corresponding air switch or motor switch will disconnect. Opening the distribution box will clearly identify the problematic motor. Since this three-phase motor is used in a vibrating screen, its direction of rotation is critical. If the phase sequence is reversed, it needs to be adjusted immediately. Adjusting the phase sequence of the three-phase motor 5 requires opening the cable connector, locating the motor, re-adjusting the phases, and then rewiring. This is time-consuming and labor-intensive. Adjusting the motor phase sequence directly by adjusting the wiring on the isolating switch 4 is much more time-saving and labor-saving.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A circuit structure for quickly determining the condition of multiple parallel motors and quickly adjusting the phase sequence of the motors, comprising multiple three-phase motors (5), a circuit protector (3), a disconnecting switch (4), a running contactor (2), and a power switch (1), characterized in that: All three-phase motors (5) are connected in parallel. The terminals of each three-phase motor (5) are connected to the first terminal of the isolating switch (4). The second terminal of the isolating switch (4) is connected to the first terminal of the circuit protector (3). The isolating switch (4), the three-phase motor (5) and the circuit protector (3) correspond one-to-one. The second terminal of all circuit protectors (3) is connected to the first terminal of the running contactor (2). The second terminal of the running contactor (2) is connected to the first terminal of the power switch (1). The second terminal of the power switch (1) is connected to the external power supply.

2. The circuit structure for quickly determining the condition of multiple parallel motors and quickly adjusting the phase sequence of the motors according to claim 1, characterized in that: All circuit protectors (3) are installed together in an isolated distribution box located near the three-phase motor (5).

3. The circuit structure for quickly determining the condition of multiple parallel motors and quickly adjusting the phase sequence of the motors according to claim 2, characterized in that: The circuit protector (3) is an air switch or a motor protection switch.

4. The circuit structure for quickly determining the condition of multiple parallel motors and quickly adjusting the phase sequence of the motors according to claim 1, characterized in that: The rated power of the three-phase motor (5) is 0.75kw.

5. The circuit structure for quickly determining the condition of multiple parallel motors and quickly adjusting the phase sequence of the motors according to claim 1, characterized in that: The external power supply is 380V three-phase electricity.

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