Compact two-in-one high-voltage explosion-proof soft starter core

Abstract

The utility model discloses a compact one drags two high pressure explosion -proof soft starter core, especially related to high pressure explosion -proof soft rise field, including the core frame, the core frame bottom inner wall from behind to front has installed KM1 alternating -current vacuum contactor, KM2 alternating -current vacuum contactor and power unit assembly in proper order, the core frame inside from front to back has installed low pressure bin, voltage mutual -inductor, fuse, KM3 alternating -current vacuum contactor, lightning arrester and KM4 alternating -current vacuum contactor in proper order. The utility model discloses with the help of a soft starter core, can start two motors through the sequential mode or selective mode, has effectively reduced the equipment investment cost of user, and the device structure core frame arrangement is reasonable, compact structure, small, and element installation is simple and convenient, this not only can reduce the use quantity of explosion -proof soft rise greatly, saves the use space, can also reduce the purchase cost of customer.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage explosion-proof soft starters, and more specifically to a compact one-to-two high-voltage explosion-proof soft starter core. Background Technology

[0002] High-voltage explosion-proof soft starter cores typically consist of multiple thyristors connected in series and parallel, with a microprocessor CPU controlling the phase-shift triggering of the thyristors. During motor startup, a gradually increasing voltage is supplied to the motor, reducing the starting current and allowing for smooth acceleration until the motor reaches full speed. Once the motor reaches full speed, the motor current drops to the normal operating current value for full speed. The soft starter then controls the bypass output relay, causing the bypass high-voltage vacuum contactor to close, allowing the motor to directly connect to the power grid.

[0003] For example, the existing technology disclosure number CN203491930U discloses a fixed explosion-proof high-voltage solid-state soft starter core device. This utility model adopts independent electrical units and power units. Each unit is first connected to the secondary circuit via an aviation plug, and then connected to the primary circuit via a high-voltage cable during use. It is small in size, simple and compact in structure, safe and reliable. After being installed inside the explosion-proof soft starter housing, the size of the explosion-proof soft starter cabinet will be greatly reduced under the premise of safety and reliability, which facilitates underground transportation, installation and maintenance.

[0004] However, the existing technology described above still has the following problems in use: traditional medium-voltage explosion-proof soft starter cores can only be used one-to-one. When there are many motors, the number of explosion-proof soft starters required will also be large, which not only increases the number of motors used and the space occupied, but also increases the customer's procurement costs. Based on this, this utility model provides a compact one-to-two high-voltage explosion-proof soft starter core. Utility Model Content

[0005] To overcome the aforementioned deficiencies of the prior art, this utility model provides a compact one-to-two high-voltage explosion-proof soft starter core. With the help of one soft starter core, two motors can be started sequentially or selectively, effectively reducing the user's equipment investment cost. The device has a reasonable arrangement of the core frame, a compact structure, a small size, and simple and convenient component installation. This not only significantly reduces the number of explosion-proof soft starters used and saves space, but also reduces the customer's procurement cost, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a compact one-to-two high-voltage explosion-proof soft starter core, comprising a core frame. From back to front, a KM1 AC vacuum contactor, a KM2 AC vacuum contactor, and a power unit assembly are sequentially installed on the bottom inner wall of the core frame. From front to back, a low-voltage compartment, a voltage transformer, a fuse, a KM3 AC vacuum contactor, a surge arrester, and a KM4 AC vacuum contactor are sequentially installed inside the core frame. From top to bottom, an inlet moving contact, an outlet moving contact I, and an outlet moving contact II are sequentially installed at the rear end of the core frame. The outlet moving contact I and outlet moving contact II are respectively connected to two motors. A current transformer I is connected to outlet moving contact I, and a current transformer II is connected to outlet moving contact II. A current transformer III is fixedly installed at the top of the core frame, connecting the inlet moving contact and the power unit assembly.

[0007] In a preferred embodiment, the output side of the incoming moving contact is connected to the input side of the KM3 AC vacuum contactor and the KM4 AC vacuum contactor, and the output sides of the KM3 AC vacuum contactor and the KM4 AC vacuum contactor are both connected to the input side of the power unit assembly.

[0008] In a preferred embodiment, the output side of the power unit assembly is connected to the input side of the KM1 AC vacuum contactor and the KM2 AC vacuum contactor.

[0009] In a preferred embodiment, the output side of the KM1 AC vacuum contactor is connected to the output side of the KM4 AC vacuum contactor via a first cable, which is connected to the outgoing moving contact II via a copper busbar. The output side of the KM2 AC vacuum contactor is connected to the output side of the KM3 AC vacuum contactor via a second cable, which is connected to the outgoing moving contact I.

[0010] In a preferred embodiment, multiple equally spaced bearing rollers are fixed on both sides of the movement frame.

[0011] In a preferred embodiment, a hook is fixedly provided at the rear end of the movement frame, and the hook is located below the moving contact II of the lead wire.

[0012] The technical effects and advantages of this utility model are as follows: This invention utilizes a single soft starter core to start two motors sequentially or selectively, effectively reducing the user's equipment investment costs. Compared with traditional one-to-one explosion-proof soft starter cores, this device has a more reasonable core frame arrangement, a compact structure, a smaller size, and simpler and more convenient component installation. This not only significantly reduces the number of explosion-proof soft starters required and saves space, but also reduces the customer's procurement costs.

[0013] The mechanism frame is equipped with bearing rollers and adopts a handcart-style design to push it into the explosion-proof housing, which is convenient for customers to install. At the same time, the mechanism frame is equipped with hooks, which can cooperate with the transmission mechanism after being pushed into the explosion-proof housing to ensure that the mechanism can still be opened and closed smoothly even when the explosion-proof housing is closed. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 for Figure 1 Enlarged view of part A in the image; Figure 3 This is the front view of the present invention; Figure 4 This is a schematic diagram of the surge arrester of this utility model; Figure 5 This is a circuit diagram of the present invention.

[0015] The attached diagram is labeled as follows: 1. Mechanism frame; 2. KM1 AC vacuum contactor; 3. KM2 AC vacuum contactor; 4. Power unit assembly; 5. Low-voltage compartment; 6. Voltage transformer; 7. Fuse; 8. KM3 AC vacuum contactor; 9. Surge arrester; 10. KM4 AC vacuum contactor; 11. Incoming moving contact; 12. Outgoing moving contact I; 13. Outgoing moving contact II; 14. Current transformer I; 15. Current transformer II; 16. Current transformer III; 17. Bearing roller; 18. Hook. Detailed Implementation

[0016] 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.

[0017] Refer to the instruction manual appendix Figures 1-5 This utility model provides a compact one-to-two high-voltage explosion-proof soft starter core, including a core frame 1. From back to front, KM1 AC vacuum contactor 2, KM2 AC vacuum contactor 3 and power unit assembly 4 are installed sequentially on the bottom inner wall of the core frame 1. From front to back, a low-voltage compartment 5, voltage transformer 6, fuse 7, KM3 AC vacuum contactor 8, surge arrester 9 and KM4 AC vacuum contactor 10 are installed inside the core frame 1. The low-voltage compartment 5 is isolated from the high voltage, ensuring high and low voltage separation and increasing the safety and reliability of the product.

[0018] Among them, surge arrester 9 is a key protection device to ensure the safe and stable operation of equipment. Its main functions are to suppress overvoltage, protect electrical equipment, and improve system reliability. Voltage transformer 6: Converts high-voltage signals into low-voltage signals to ensure the safety of equipment and personnel, provides accurate voltage data for measurement and metering, provides voltage monitoring signals for protection systems, provides reference voltage for control circuits, and ensures stable system operation; Fuse 7: A key protective component that ensures the safety of voltage transformer 6 and its associated circuits. Its core function is to prevent internal short circuits in voltage transformer 6, protect voltage transformer 6 from external short circuit impacts, prevent secondary circuit faults from having a backlash effect on the primary side, limit the fault range, and improve system safety. KM1 AC vacuum contactor 2: uses a vacuum interrupter to extinguish arcs, and is used to connect and isolate the reverse power supply of motor #1; KM2 AC vacuum contactor 3, through vacuum arc extinguishing chamber, is used to connect and isolate the reverse power supply of motor #2; The KM3 AC vacuum contactor 8 uses a vacuum interrupter to extinguish arcs, and is used to connect and disconnect the normal operating current. The KM4 AC vacuum contactor 10 uses a vacuum interrupter to extinguish arcs, and is used to connect and disconnect the normal operating current. Power Unit Component 4: The core power conversion component that realizes the core function of "soft start" of motor. Its role revolves around "smoothly adjusting output voltage, controlling starting current, and achieving shock-free transition". It is a key actuator connecting high-voltage power supply and motor.

[0019] Next, from top to bottom, the following are installed at the rear end of the core frame 1: the incoming moving contact 11, the outgoing moving contact I 12, and the outgoing moving contact II 13. The outgoing moving contact I 12 and the outgoing moving contact II 13 are respectively connected to two motors (motor #1 and motor #2). The outgoing moving contact I 12 is connected to a current transformer I 14, and the outgoing moving contact II 13 is connected to a current transformer II 15. A current transformer III 16 is fixedly installed at the top of the core frame 1, and the current transformer III 16 is connected between the incoming moving contact 11 and the power unit assembly 4.

[0020] Inlet moving contact 11: Used for quick connection of the movement to the external main circuit; Outgoing moving contact I12: Used for quick connection of the movement to the external main circuit; Outgoing moving contact II13: Used for quick connection of the movement to the external main circuit; Current transformer I14: It converts the large current in the high-voltage circuit into the small current in the low-voltage circuit according to the principle of electromagnetic induction, and provides a safe and reliable signal source for the protection of motor #1. Current transformer II15: It converts the large current in the high-voltage circuit into the small current in the low-voltage circuit according to the principle of electromagnetic induction, and provides a safe and reliable signal source for the protection of motor #2. Current transformer Ⅲ16: It converts the large current in the high-voltage circuit into the small current in the low-voltage circuit according to the principle of electromagnetic induction, providing a safe and reliable signal source for soft starting.

[0021] The output side of the incoming moving contact 11 is connected to the input side of KM3 AC vacuum contactor 8 and KM4 AC vacuum contactor 10. The output sides of KM3 AC vacuum contactor 8 and KM4 AC vacuum contactor 10 are both connected to the input side of power unit assembly 4. The output side of power unit assembly 4 is connected to the input side of KM1 AC vacuum contactor 2 and KM2 AC vacuum contactor 3.

[0022] The output side of the KM1 AC vacuum contactor 2 and the output side of the KM4 AC vacuum contactor 10 are connected by a first cable, which is connected to the outgoing moving contact II 13 via a copper busbar. The output side of the KM2 AC vacuum contactor 3 and the output side of the KM3 AC vacuum contactor 8 are connected by a second cable, which is connected to the outgoing moving contact I 12.

[0023] In actual use, the outgoing moving contact I12 and outgoing moving contact II13 cooperate with the stationary contacts of different explosion-proof housings to transmit power to two external motors. When motor #1 starts, AC vacuum contactor 2 of KM1 engages and its feedback signal is normal. Motor #1 gradually starts to rotate and then reaches its rated operating speed. AC vacuum contactor 8 of KM3 engages and its feedback signal is normal. After a 5-second delay, AC vacuum contactor 2 of KM1 disengages.

[0024] When motor #2 starts, AC vacuum contactor 3 of KM2 engages and the feedback signal of AC vacuum contactor 3 is normal. The motor gradually starts to rotate and then reaches the rated operating speed. AC vacuum contactor 10 of KM4 engages and the feedback signal of AC vacuum contactor 10 is normal. After a delay of 5 seconds, AC vacuum contactor 3 of KM2 disconnects.

[0025] In a one-to-two control system, when one motor is starting, the other motor cannot start. The next motor can only start 10 minutes after one motor starts and switches to bypass.

[0026] In addition, when a fault occurs during startup or operation, the soft starter core will shut down the equipment and sound an alarm. At the same time, the soft starter core reduces the voltage applied to the motor by performing phase angle trigger control on the power unit component 4, and then smoothly increases the motor torque by slowly controlling the voltage and current applied to the motor until the motor accelerates to full speed. This starting method can reduce the starting inrush current of the motor and reduce the impact on the power grid and the motor itself.

[0027] Refer to the instruction manual appendix Figure 1 and Figure 3 The mechanism frame 1 has multiple bearing rollers 17 that are evenly spaced on both sides, and a hook 18 is fixed at the rear end of the mechanism frame 1. The hook 18 is located below the outgoing moving contact II 13.

[0028] By setting bearing rollers 17 on both the front and rear sides of the mechanism frame 1, it can be easily pushed into the explosion-proof housing. Furthermore, the rear end of the mechanism frame 1 is equipped with a hook 18, which can be easily pushed into the explosion-proof housing and then cooperate with the transmission mechanism to ensure that the mechanism can be opened and closed while the explosion-proof mechanism is closed.

[0029] The low-pressure chamber 5 is isolated from the high-pressure chamber, ensuring separation of high and low pressure and increasing the safety and reliability of the product.

[0030] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A compact one-to-two high-voltage explosion-proof soft starter core, comprising a core frame (1), characterized in that: The inner bottom wall of the core frame (1) is equipped with KM1 AC vacuum contactor (2), KM2 AC vacuum contactor (3) and power unit assembly (4) from back to front. The core frame (1) is equipped with a low-voltage compartment (5), a voltage transformer (6), a fuse (7), a KM3 AC vacuum contactor (8), a surge arrester (9) and a KM4 AC vacuum contactor (10) in sequence from front to back. The voltage transformer (6) is connected to the fuse (7). The rear end of the core frame (1) is sequentially equipped with an inlet moving contact (11), an outlet moving contact I (12) and an outlet moving contact II (13) from top to bottom. The outlet moving contact I (12) and the outlet moving contact II (13) are respectively connected to two motors. The outlet moving contact I (12) is connected to a current transformer I (14), and the outlet moving contact II (13) is connected to a current transformer II (15). The top of the core frame (1) is fixedly equipped with a current transformer III (16), which is connected between the inlet moving contact (11) and the power unit assembly (4).

2. The compact one-to-two high-voltage explosion-proof soft starter core according to claim 1, characterized in that: The output side of the incoming moving contact (11) is connected to the input side of the KM3 AC vacuum contactor (8) and the KM4 AC vacuum contactor (10), and the output sides of the KM3 AC vacuum contactor (8) and the KM4 AC vacuum contactor (10) are both connected to the input side of the power unit assembly (4).

3. The compact one-to-two high-voltage explosion-proof soft starter core according to claim 1, characterized in that: The output side of the power unit assembly (4) is connected to the input side of the KM1 AC vacuum contactor (2) and the KM2 AC vacuum contactor (3).

4. The compact one-to-two high-voltage explosion-proof soft starter core according to claim 1, characterized in that: The output side of the KM1 AC vacuum contactor (2) is connected to the output side of the KM4 AC vacuum contactor (10) by a first cable, which is connected to the outgoing moving contact II (13) via a copper busbar. The output side of the KM2 AC vacuum contactor (3) is connected to the output side of the KM3 AC vacuum contactor (8) by a second cable, which is connected to the outgoing moving contact I (12).

5. A compact one-to-two high-voltage explosion-proof soft starter core according to claim 1, characterized in that: The mechanism frame (1) has multiple equally spaced bearing rollers (17) fixed on both sides.

6. A compact one-to-two high-voltage explosion-proof soft starter core according to claim 1, characterized in that: The rear end of the mechanism frame (1) is fixedly provided with a hook (18), which is located below the outgoing moving contact II (13).

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