Three-phase power supply positive and negative phase sequence change-over switch for teaching

Abstract

A positive and negative phase sequence change-over switch of a three-phase power supply for teaching comprises a pair of installation discs (1), a group of insulation supporting rods (2) and an operation change-over rod (3), the group of insulation supporting rods (2) are annularly distributed and installed between the pair of installation discs (1), three contacts (4) are arranged on the insulation supporting rods (2), and the two ends of the operation change-over rod (3) are movably installed in the corresponding installation discs (1) respectively; the change-over switch has the advantages that the structure is simple, and the change-over switch adopts a simple and clear design structure, so that a user can quickly understand and operate the change-over switch.

Description

Technical Field

[0001] This utility model relates to the field of electrical teaching experimental equipment, specifically to a three-phase power supply forward and reverse phase sequence switching switch for teaching. Background Technology

[0002] Currently, in electrical teaching experiments, it is frequently necessary to switch the forward and reverse phase sequence of three-phase power supplies to adapt to different experimental needs and power system simulation scenarios. Traditional three-phase power supply phase sequence switching methods are often complex to operate and pose safety hazards. Therefore, it is particularly important to design a three-phase power supply forward and reverse phase sequence switching switch that is simple in structure, easy to operate, safe, reliable, and intuitive. Utility Model Content

[0003] The purpose of this utility model is to address the above-mentioned shortcomings by providing a three-phase power supply forward and reverse phase sequence switching switch for teaching purposes.

[0004] This utility model includes a pair of mounting plates, a set of insulating support rods, and an operating conversion rod.

[0005] A set of insulating support rods are arranged in a ring between a pair of mounting plates. Each insulating support rod has three contacts. The two ends of the operating conversion rod are respectively movably installed in the corresponding mounting plates. The operating conversion rod has three contact arms. Rotating the operating conversion rod makes the contact arms make electrical contact with the corresponding contacts.

[0006] A set of mounting slots is cut on the outer wall of the mounting plate, and the end of the insulating support rod is installed in the mounting slot by bolts.

[0007] A set of insulating support rods consists of three contact rods and one support rod, with three contacts on each of the three contact rods.

[0008] The mounting plate has a mounting hole in the middle, and the end of the operating switch is embedded in the mounting hole, allowing the end of the operating switch to rotate within the mounting hole.

[0009] The contact arm consists of a connecting plate, an elastic contact piece, a fixed contact piece, a pair of guide posts, and a pair of springs. The pair of guide posts are installed at the end of the connecting plate, and the fixed contact piece is installed at one end of the guide post. The elastic contact piece has a pair of guide holes and is installed on the pair of guide posts through the guide holes. The spring is sleeved on the guide post, with one end of the spring pressing against the elastic contact piece. The other end of the spring is provided with a limit piece. The other end of the guide post has a pin hole, and a cotter pin is inserted into the pin hole to press the limit piece.

[0010] Both the flexible contact piece and the fixed contact piece are sector-shaped contact pieces.

[0011] A changeover switch is installed at one end of the operating lever.

[0012] The insulating support rod is made of insulating bakelite.

[0013] One end of the contact is a screw, and the other end of the contact is equipped with a teardrop-shaped contact. One end of the contact is threaded onto the insulating support rod and is fastened with a nut.

[0014] The advantages of this utility model are:

[0015] 1. Simple structure: The changeover switch of this invention adopts a simple and clear design structure, which allows users to quickly understand and operate it.

[0016] 2. Easy to operate. The rotation of the intermediate operating lever can be easily controlled by operating the changeover switch to achieve flexible switching of the positive and negative phase sequence of the three-phase power supply.

[0017] 3. Safe and reliable, using insulated bakelite as the main support structure material and teardrop-shaped contact design to ensure the safety and stability of circuit connection.

[0018] 4. Intuitive and easy to understand: The design of the operation switch and the intermediate operation switch lever allows users to intuitively identify the current phase sequence status, which is convenient for teaching and experimental use.

[0019] 5. Improve experimental efficiency: The changeover switch of this invention can meet the needs of flexible phase sequence switching of three-phase power supply in power teaching experiments, thereby improving experimental efficiency and teaching quality. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a utility model Figure 1 A partially enlarged structural diagram.

[0022] Figure 3 This is a schematic diagram of the structure of the contact arm and the contact head when they are in electrical contact.

[0023] Figure 4 This is a schematic diagram of the operation conversion lever of this utility model.

[0024] Figure 5 This is a schematic diagram of the contact structure of this utility model. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of the embodiments of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, if terms such as "first" or "second" appear in the description of this invention, they are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0030] As shown in the attached drawings, this utility model includes a pair of mounting plates 1, a set of insulating support rods 2, and an operation conversion rod 3.

[0031] A set of insulating support rods 2 are arranged in a ring between a pair of mounting plates 1. Three contacts 4 are provided on the insulating support rods 2. The two ends of the operating conversion rod 3 are respectively movably installed in the corresponding mounting plates 1. Three contact arms 5 are provided on the operating conversion rod 3. Rotating the operating conversion rod 3 makes the contact arms 5 make electrical contact with the corresponding contacts 4.

[0032] A set of mounting slots is opened on the outer wall of the mounting plate 1, and the end of the insulating support rod 2 is installed in the mounting slot by bolts.

[0033] A set of insulating support rods 2 consists of three contact rods and one support rod, with three contacts 4 respectively installed on the three contact rods.

[0034] The mounting plate 1 has a mounting hole in the middle, and the end of the operating conversion lever 3 is embedded in the mounting hole, allowing the end of the operating conversion lever 3 to rotate within the mounting hole.

[0035] The contact arm 5 consists of a connecting plate 6, an elastic contact piece 7, a fixed contact piece 8, a pair of guide posts 9, and a pair of springs 10. The pair of guide posts 9 are installed at the end of the connecting plate 6, and the fixed contact piece 8 is installed at one end of the guide post 9. The elastic contact piece 7 has a pair of guide holes and is installed on the pair of guide posts 9 through the guide holes. The spring 10 is sleeved on the guide post 9, and one end of the spring 10 is pressed against the elastic contact piece 7. The other end of the spring 10 is provided with a limit piece 11. The other end of the guide post 9 has a pin hole, and a cotter pin 12 is inserted into the pin hole to press the limit piece 11.

[0036] Both the elastic contact piece 7 and the fixed contact piece 8 are sector-shaped contact pieces.

[0037] A changeover switch 13 is provided at one end of the operating changeover lever 3.

[0038] The insulating support rod 2 is made of insulating bakelite.

[0039] One end of the contact 4 is a screw, and the other end of the contact 4 is provided with a teardrop-shaped contact. One end of the contact 4 is threaded onto the insulating support rod 2 and is fastened with a nut.

[0040] Example 1: A set of insulating support rods 2 has three contact rods: a positive phase sequence support rod with power input points U1, V1, and W1; a negative phase sequence support rod with U2, V2, and W2; and a power output rod with L1, L2, and L3. The three contact rods are spaced relatively close together, while the distance between the support rods and the contact rods is relatively large, providing support. A spring 10 presses against the elastic contact piece 7 to create strong contact pressure. The elastic contact piece 7 and the fixed contact piece 8 are made of two 2mm copper plates. A changeover switch 13 is installed at the front end of the operating changeover rod 3 to control its rotation. The other end of the contact 4 has a teardrop-shaped contact, which works with the elastic contact piece 7 and the fixed contact piece 8 to connect and disconnect the circuit.

[0041] When it is necessary to change the phase sequence of a three-phase power supply, the user can control the rotation of the operating changer lever 3 by turning it. For example... Figure 2As shown, when the operating switch 3 is rotated to the positive phase sequence position, the contact arm 5 is located between the positive phase sequence support rod and the power output rod. Output points L1, L2, and L3 are connected to the positive phase sequence nodes U1, V1, and W1 respectively through contact plates, realizing the positive phase sequence output of the three-phase power supply. When the operating switch 3 is rotated to the reverse phase sequence position, the contact arm 5 is located between the reverse phase sequence support rod and the power output rod. Output points L1, L2, and L3 are connected to the reverse phase sequence nodes U2, V2, and W2 respectively through contact plates, realizing the reverse phase sequence output of the three-phase power supply. When the intermediate operating switch 3 is in the zero position, the contact arm 5 is located at the center of the power output rod output points L1, L2, and L3, and all output points are disconnected, ensuring that the circuit is in a safe state.

Claims

1. A three-phase power supply phase sequence conversion switch for teaching, characterized in that It comprises a pair of installation discs (1), a set of insulating support rods (2) and an operating conversion rod (3), A set of insulating support rods (2) are annularly distributed between a pair of installation discs (1), and three contacts (4) are arranged on the insulating support rods (2). The operating conversion rod (3) is movably arranged at both ends in the corresponding installation disc (1), and three contact arms (5) are arranged on the operating conversion rod (3). The contact arms (5) are electrically contacted with the corresponding contacts (4) by rotating the operating conversion rod (3).

2. A three-phase power supply phase sequence conversion switch for teaching purposes according to claim 1, characterized in that, A set of installation grooves are formed on the outer wall of the installation disc (1), and the end of the insulating support rod (2) is bolted in the installation groove.

3. A three-phase power supply phase and reverse sequence conversion switch for teaching purposes according to claim 1, characterized in that, A set of insulating support rods (2) are composed of three contact rods and a support rod, and three contacts (4) are arranged on the three contact rods, respectively.

4. The three-phase power source phase and reverse phase sequence conversion switch for teaching according to claim 1, characterized in that, An installation hole is formed in the middle of the installation disc (1), and the end of the operating conversion rod (3) is embeddedly installed in the installation hole. The end of the operating conversion rod (3) can rotate in the installation hole.

5. A three-phase power supply phase and reverse sequence conversion switch for teaching purposes according to claim 1, characterized in that, The contact arm (5) is composed of a connecting plate (6), an elastic contact piece (7), a fixed contact piece (8), a pair of guide columns (9) and a pair of springs (10). The pair of guide columns (9) are arranged at the end of the connecting plate (6), the fixed contact piece (8) is arranged at one end of the guide column (9), the elastic contact piece (7) is provided with a pair of guide holes and is installed on the pair of guide columns (9) through the guide holes, the spring (10) is sleeved on the guide column (9), one end of the spring (10) is pressed on the elastic contact piece (7), and the other end of the spring (10) is provided with a limiting piece (11). The other end of the guide column (9) is provided with a pin hole, and a split pin (12) is inserted into the pin hole to press the limiting piece (11).

6. A three-phase power supply phase and reverse sequence conversion switch for teaching purposes according to claim 5, characterized in that, The elastic contact piece (7) and the fixed contact piece (8) are both fan-shaped contact pieces.

7. A three-phase power supply phase and reverse sequence conversion switch for teaching purposes according to claim 1, characterized in that, One end of the operating conversion rod (3) is provided with a conversion switch (13).

8. A three-phase power supply phase and reverse sequence conversion switch for teaching purposes according to claim 1, characterized in that, The insulating support rod (2) is made of insulating bakelite.

9. A three-phase power supply phase and reverse sequence conversion switch for teaching purposes according to claim 1, characterized in that, One end of the contact (4) is a screw rod, and the other end of the contact (4) is provided with a water drop-shaped contact. One end of the contact (4) is threadedly installed on the insulating support rod (2) and is fastened by a nut.

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