Self-checking locking device for power distribution cabinet
By installing a start-stop switch and current transformer on the distribution cabinet door, combined with an undercurrent relay and an electromagnetic lock, the safety control of the equipment during the industrial frequency conversion switching process is achieved, and safety hazards and equipment damage caused by arc are solved.
Patent Information
- Application Number
- CN202421559301.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-03
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-07-03
AI Technical Summary
In industrial production, equipment may generate arcs during industrial frequency conversion switching, resulting in damage to equipment or injury to personnel, and the prior art is difficult to effectively prevent such accidents.
A distribution cabinet self-test locking device is designed. After the operation of the electrical equipment is stopped, the current transformer transmits a signal to the undercurrent relay to control the opening of the electromagnetic lock, allowing personnel to open the cabinet door; after the electrical equipment is started, the current transformer transmits the current signal, and the undercurrent relay controls the electromagnetic lock to be connected, ensuring that the cabinet door can be opened only after the equipment stops running.
It effectively avoids safety hazards and equipment damage caused by arc during equipment switching, ensures the safety of operators and maintenance personnel, and avoids unnecessary equipment damage.
Smart Images
Figure CN222868354U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a locking device, more specifically a self-checking locking device for a power distribution cabinet. Background Art
[0002] In the process of industrial production, some high-power equipment needs to switch between power frequency and variable frequency according to the working conditions. The switching between power frequency and variable frequency is generally completed by using a knife switch. In order to prevent the arc generated by the knife switch during the switching process, which may cause damage to the equipment or injury to personnel, such equipment needs to be confirmed to stop running before switching between power frequency and variable frequency. At present, the operating status of the equipment is generally judged by hanging a sign or locking it, and personnel can open the cabinet door at will to operate, causing harm to operators and maintenance personnel, or unnecessary damage to the equipment. Summary of the invention
[0003] The purpose of the utility model is to provide a self-check locking device for a power distribution cabinet, which can first stop the operation of the electrical equipment through the start-stop switch installed on the door of the power distribution cabinet during use. At this time, the current transformer transmits the power-off signal to the undercurrent relay, and the undercurrent relay controls the electromagnetic lock to open; then open the power distribution cabinet, switch the double-throw conversion knife switch to the frequency conversion switch contact or the power frequency switch contact according to the needs, close the door of the power distribution cabinet, and operate the start-stop switch to start the electrical equipment. At this time, the current transformer transmits the current signal to the undercurrent relay, and the undercurrent relay controls the electromagnetic lock to close. During the whole process, only after the equipment stops running and the electromagnetic lock is unlocked, can personnel open the door of the power distribution cabinet, thereby avoiding easy harm to operators and maintenance personnel, and avoiding unnecessary damage to equipment.
[0004] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:
[0005] The self-check locking device of the distribution cabinet comprises a distribution cabinet, which is a rectangular shell structure with an opening on one side. A distribution cabinet door is installed on the open side of the distribution cabinet, one side of the distribution cabinet door is hinged to the side of the distribution cabinet, and the distribution cabinet door can close the opening of the distribution cabinet. The outer side of the cabinet body of the distribution cabinet is connected to an electromagnetic lock and an undercurrent relay, and the electromagnetic lock can lock the distribution cabinet door. One side of the inner wall of the distribution cabinet is connected to a current transformer, a double-throw conversion switch, a frequency converter, and an intermediate relay.
[0006] In order to further achieve the purpose of the utility model, the following technical scheme can also be adopted: the output end of the current transformer is connected in series with the controlled end of the undercurrent relay through a wire, the input end of the current transformer is connected in series with the electrical equipment, the controlled end of the intermediate relay, and the power supply, and the control end of the intermediate relay is connected in series with the start-stop switch.
[0007] The current transformer, electrical equipment, intermediate relay, and power supply constitute an electrical equipment power supply device, which has two first ports and a second port, wherein the first port is connected to the current transformer, the second port is connected to the controlled end of the intermediate relay, the first port is connected to a double-throw conversion knife switch, the second port is connected to the power frequency switching contact and one end of the frequency converter, the other end of the frequency converter is connected to the variable frequency switching contact, and the double-throw conversion knife switch can be in contact and conduction with the variable frequency switching contact or the power frequency switching contact.
[0008] The advantages of the utility model are as follows: during the use of the utility model, the operation of the electrical equipment is first stopped by the start-stop switch installed on the door of the power distribution cabinet. At this time, the current transformer transmits the power-off signal to the undercurrent relay, and the undercurrent relay controls the electromagnetic lock to open; then the power distribution cabinet is opened, and the double-throw conversion knife switch is switched to the frequency conversion switching contact or the power frequency switching contact according to the needs, the door of the power distribution cabinet is closed, and the start-stop switch is operated to start the electrical equipment. At this time, the current transformer transmits the current signal to the undercurrent relay, and the undercurrent relay controls the electromagnetic lock to close. During the whole process, only after the equipment stops running and the electromagnetic lock is unlocked, can personnel open the door of the power distribution cabinet, thereby avoiding easy harm to operators and maintenance personnel, and avoiding unnecessary damage to the equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:
[0010] Figure 1 This is one of the structural schematic diagrams of the utility model;
[0011] Figure 2 This is the second structural diagram of the utility model;
[0012] Figure 3 It is a schematic diagram of the circuit structure of the utility model.
[0013] Marked parts: 1-1, distribution cabinet, 1-2 distribution cabinet door, 2, electromagnetic lock, 3, undercurrent relay, 4, current transformer, 5, double-throw change-over switch, 5-1 frequency conversion switching contact, 5-2 power frequency switching contact, 6, frequency converter, 7, intermediate relay, 8, start-stop switch, 9, electrical equipment, 13, first port, 14, second port, 15, power supply. DETAILED DESCRIPTION
[0014] The preferred embodiments of the present utility model are described below in conjunction with the accompanying drawings.
[0015] Embodiment 1:
[0016] The self-check locking device of the power distribution cabinet, such as Figure 1-Figure 3 As shown, it includes a distribution cabinet 1-1, which is a rectangular shell structure with an opening on one side. A distribution cabinet door 1-2 is installed on the open side of the distribution cabinet 1-1. One side of the distribution cabinet door 1-2 is hinged to one side of the distribution cabinet 1-1. The distribution cabinet door 1-2 can close the opening of the distribution cabinet 1-1. The outer side of the cabinet body of the distribution cabinet 1-1 is connected to an electromagnetic lock 2 and an undercurrent relay 3. The electromagnetic lock 2 can lock the distribution cabinet door 1-2. One side of the inner wall of the distribution cabinet 1-1 is connected to a current transformer 4, a double-throw conversion switch 5, a frequency converter 6, and an intermediate relay 7.
[0017] During the use of the utility model, the operation of the electric equipment 9 is first stopped by the start-stop switch 8 installed on the distribution cabinet door 1-2. At this time, the current transformer 4 transmits the power-off signal to the undercurrent relay 3, and the undercurrent relay 3 controls the electromagnetic lock 2 to open; then the distribution cabinet 1-1 is opened, and the double-throw conversion knife switch 5 is switched to the frequency conversion switching contact 5-1 or the power frequency switching contact 5-2 according to the needs, the distribution cabinet door 1-2 is closed, and the start-stop switch 8 is operated to start the electric equipment. At this time, the current transformer 4 transmits the current signal to the undercurrent relay 3, and the undercurrent relay 3 controls the electromagnetic lock 2 to be attracted. During the whole process, only after the equipment stops running and the electromagnetic lock 2 is unlocked, can the personnel open the distribution cabinet door 1-2, thereby avoiding easy harm to the operator and maintenance personnel, and avoiding unnecessary damage to the equipment.
[0018] Specific implementation of material selection and feasibility analysis: The samples we actually made use the drawings in the specification as drawings and are implemented according to the proportions and matching methods of the various components in the drawings. The connections mentioned are common connection methods such as strong adhesive connection, welding, riveting, flange connection, one-piece molding connection, etc. In actual production, the corresponding connection method, thickness and strength of the connection point can be selected creatively according to the actual connection strength requirements.
[0019] Embodiment 2:
[0020] The self-check locking device of the power distribution cabinet, such as Figure 1-Figure 3As shown, it includes a distribution cabinet 1-1, which is a rectangular shell structure with an opening on one side. A distribution cabinet door 1-2 is installed on the open side of the distribution cabinet 1-1, and one side of the distribution cabinet door 1-2 is hinged to the side of the distribution cabinet 1-1. The distribution cabinet door 1-2 can close the opening of the distribution cabinet 1-1, and the outer side of the cabinet body of the distribution cabinet 1-1 is connected with an electromagnetic lock 2 and an undercurrent relay 3, and the electromagnetic lock 2 can lock the distribution cabinet door 1-2. One side of the inner wall of the distribution cabinet 1-1 is connected with a current transformer 4, a double-throw conversion switch 5, a frequency converter 6, and an intermediate relay 7. The output end of the current transformer 4 and the controlled end of the undercurrent relay 3 are connected in series through a wire, the input end of the current transformer 4 is connected in series with the electrical equipment 9, the controlled end of the intermediate relay 7, and the power supply 15, and the control end of the intermediate relay 7 is connected in series with the start-stop switch 8.
[0021] Embodiment 3:
[0022] The self-check locking device of the power distribution cabinet, such as Figure 1-Figure 3 As shown, it includes a distribution cabinet 1-1, which is a rectangular shell structure with an opening on one side. A distribution cabinet door 1-2 is installed on the open side of the distribution cabinet 1-1. One side of the distribution cabinet door 1-2 is hinged to one side of the distribution cabinet 1-1. The distribution cabinet door 1-2 can close the opening of the distribution cabinet 1-1. The outer side of the cabinet body of the distribution cabinet 1-1 is connected to an electromagnetic lock 2 and an undercurrent relay 3. The electromagnetic lock 2 can lock the distribution cabinet door 1-2. One side of the inner wall of the distribution cabinet 1-1 is connected to a current transformer 4, a double-throw conversion switch 5, a frequency converter 6, and an intermediate relay 7.
[0023] The current transformer 4, the electrical equipment 9, the intermediate relay 7, and the power supply 15 constitute an electrical equipment power supply device, which has two first ports 13 and a second port 14, wherein the first port 13 is connected to the current transformer 4, and the second port 14 is connected to the controlled end of the intermediate relay 7. The first port 13 is connected to the double-throw conversion knife switch 5, and the second port 14 is connected to the power frequency switching contact 5-2 and one end of the frequency converter 6. The other end of the frequency converter 6 is connected to the variable frequency switching contact 5-1, and the double-throw conversion knife switch 5 can be in contact and conduction with the variable frequency switching contact 5-1 or the power frequency switching contact 5-2.
[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention.
Claims
1. The self-check locking device of the power distribution cabinet is characterized by: The invention comprises a power distribution cabinet (1-1), wherein the power distribution cabinet (1-1) is a rectangular parallelepiped shell structure with one side open, a power distribution cabinet door (1-2) is installed on the open side of the power distribution cabinet (1-1), one side of the power distribution cabinet door (1-2) is hinged to the side of the power distribution cabinet (1-1), the power distribution cabinet door (1-2) can close the opening of the power distribution cabinet (1-1), the outer side of the cabinet body of the power distribution cabinet (1-1) is connected to an electromagnetic lock (2) and an undercurrent relay (3), the electromagnetic lock (2) can lock the power distribution cabinet door (1-2), and one side of the inner wall of the power distribution cabinet (1-1) is connected to a current transformer (4), a double-throw conversion switch (5), a frequency converter (6), and an intermediate relay (7).
2. The self-check locking device for a power distribution cabinet according to claim 1 is characterized in that: The output end of the current transformer (4) is connected in series with the controlled end of the undercurrent relay (3) via a wire, the input end of the current transformer (4) is connected in series with the electrical equipment (9), the controlled end of the intermediate relay (7), and the power supply (15), and the control end of the intermediate relay (7) is connected in series with the start-stop switch (8).
3. The self-check locking device for a power distribution cabinet according to claim 1 is characterized in that: The current transformer (4), the electric equipment (9), the intermediate relay (7), and the power supply (15) constitute an electric equipment power supply device, the electric equipment power supply device having two first ports (13) and a second port (14), wherein the first port (13) is connected to the current transformer (4), the second port (14) is connected to the controlled end of the intermediate relay (7), the first port (13) is connected to the double-throw conversion knife switch (5), the second port (14) is connected to the power frequency switching contact (5-2) and one end of the frequency converter (6), the other end of the frequency converter (6) is connected to the variable frequency switching contact (5-1), and the double-throw conversion knife switch (5) can be in contact with the variable frequency switching contact (5-1) or the power frequency switching contact (5-2) for conduction and coordination.