CN208256566U - A kind of electrical cabinet three-station structure - Google Patents

Abstract

The utility model relates to a three-position switch structure for an electric cabinet. The structure of the three-position switch for the electrical cabinet includes a cabinet body and a three-position switch arranged on the cabinet body. The three-position switch includes an isolated static contact, a grounding static contact, and a rotating knife. The rotating knife has a function during the rotation stroke. The grounding station connected to the grounding static contact, the conduction station connected to the isolated static contact, and the isolated station disconnected from the grounding static contact and the isolated static contact at the same time, the cabinet is equipped with a bus bar, the The isolating static contact is arranged on the busbar, and the plate surface of the busbar is perpendicular to the rotation axis of the rotary switch knife. The plate surface of the bus bar is perpendicular to the rotation axis of the rotating switch knife, which ensures the overall strength of the bus bar after installation. When the rotating switch knife contacts the isolated static contact, the bending is small, preventing the isolated static contact from deviating from the original position, and ensuring three Normal operation of the position switch.

Description

A three-position switch structure for an electrical cabinet

technical field

The utility model relates to a three-position switch structure for an electric cabinet.

Background technique

The three-position switch is a commonly used switching element in the electrical cabinet. The commonly used three-position switch includes a grounding static contact, an isolating static contact and a rotating knife. The isolating static contact is connected to the bus bar in the electrical cabinet, and the grounding static contact It is connected with the cabinet body of the electrical cabinet for grounding, and the rotating switch knife is connected with the bus bar on the outlet side. During the rotating stroke, the rotating switch knife has a grounding station connected to the grounding static contact and a conduction station connected to the isolated static contact. The isolation position and the isolation position are disconnected simultaneously with the grounding static contact and the isolation static contact.

The authorized announcement number is CN202602159U, and the authorized announcement date is 2012.12.12. The Chinese utility model patent discloses a three-station intelligent isolating switch cabinet with sulfur hexafluoride insulation. The three-station intelligent isolating switch cabinet includes a gas box ( That is, the cabinet body) and the three-position switch set in the cabinet, the three-position switch includes the isolating switch contact assembly (i.e. isolating static contact), the grounding switch contact assembly (i.e. grounding static contact), rotating knife and The busbar is arranged horizontally, and the isolated static contact is fixed on the busbar.

When the above-mentioned three-station intelligent isolating switchgear is in use, the bus bar is a plate-shaped structure, and the plate surface of the bus bar is arranged horizontally and parallel to the rotation axis of the rotating knife. The rotating knife contacts with the isolation static contact during the rotation process. So that the three-position switch is in the conduction position. However, in order to ensure the quick response of the three-position switch, the rotating blade rotates at a faster speed. At the same time, in order to ensure a good conduction effect, there will be a large force when the rotating blade and the isolated static contact are closed. However, the plate surface of the bus bar is parallel to the rotation axis of the rotating switch knife, and the bus bar is more flexible and will bend when it is stressed, resulting in the isolation of the static contact after the rotating knife and the isolation static contact. Deviated from the original position, affecting the normal operation of the three-position switch.

Utility model content

The purpose of the utility model is to provide a three-position switch structure for an electrical cabinet to solve the problem in the prior art that the isolated static contact of the three-position switch deviates from the original position and affects the normal operation of the three-position switch.

In order to solve the above-mentioned technical problems, the technical scheme of the three-position switch structure for the electric cabinet of the present invention is:

The electric cabinet uses a three-position switch structure, including a cabinet body and a three-position switch arranged on the cabinet body. The three-position switch includes an isolated static contact, a grounding static contact, and a rotating switch blade. The rotating switch blade is in the rotation stroke It has a grounding station connected to the grounding static contact, a conduction station connected to the isolated static contact, and an isolated station that is disconnected from the grounding static contact and the isolated static contact at the same time. There is a busbar on the cabinet. The isolating static contact is arranged on the busbar, and the plate surface of the busbar is perpendicular to the rotation axis of the rotary switch knife.

The beneficial effect of this technical solution is that: the board surface of the bus bar is perpendicular to the rotation axis of the rotating switch knife, which ensures the overall strength of the bus bar after installation, and the bending generated when the rotating switch knife contacts the isolated static contact is small, avoiding the isolation of static contacts. The contact deviates from the original position to ensure the normal operation of the three-position switch.

The busbar includes two busbar monomers arranged side by side along the direction of the rotation axis of the rotary blade, and the isolating fixed contact is connected to the two busbar monomers at the same time. The two busbar monomers can enhance the fixing strength of the isolated static contacts.

There is a space between the two busbar monomers. There is an interval between the two busbar monomers, which can enhance the overall strength of the two busbar monomers after they are integrated.

The isolating static contact is arranged in the space between two busbar monomers and clamped and fixed between the two busbar monomers. The contact area between the isolated static contact and the two busbar monomers is increased to ensure the conduction effect of the current.

The rotating switch knife includes two knife bodies arranged at intervals, and there is an accommodating space between the two knife bodies for accommodating and contacting the isolated static contact when the knife body rotates. The two cutter bodies can increase the contact area with the isolated static contact, and exert force on both sides of the isolated static contact to prevent the isolated static contact from shifting to one side.

The cabinet body is also provided with a busbar connector, and the two ends of the busbar are respectively fixedly connected with the busbar connector. The busbar connector can enhance the fixing strength of the busbar and prevent the busbar from bending.

The three-position switch also includes an operating mechanism arranged outside the cabinet and a transmission mechanism connected to the rotating switch knife arranged inside the cabinet. The operating mechanism and the transmission mechanism are connected at the cabinet through a magnetic fluid seal. The sealing effect of the magnetic fluid seal is good, which can ensure the sealing performance of the cabinet body.

The transmission mechanism includes a transmission shaft connected to the magnetic fluid seal, a crank arm arranged on the transmission shaft, and insulating pull rods whose two ends are respectively hinged to the crank arm and the rotary switch knife.

Description of drawings

Fig. 1 is the structural representation of the embodiment 1 of the three-position switch structure of the electric cabinet of the present utility model;

Fig. 2 is the side view of embodiment 1 of the three-position switch structure of the electric cabinet of the present invention;

Fig. 3 is a partially enlarged schematic diagram of Embodiment 1 of the structure of a three-position switch for an electrical cabinet of the present invention.

Marks in the figure: 1. Operating mechanism; 2. Magnetic fluid seal; 3. Bearing housing; 4. Bearing; 5. Transmission shaft; Tie rod; 10. Grounding static contact; 11. Isolation static contact; 12. Busbar; 13. Busbar connector; 14. Cabinet body; 15. Shaft sleeve.

Detailed ways

Embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

Embodiment 1 of a three-position switch structure for an electric cabinet of the present invention, as shown in FIGS. 1 to 3 , includes a cabinet body 14 on which a three-position switch is provided. The transmission line of the three-position switch structure used in the electrical cabinet is a three-phase line. The three-position switch includes working mechanisms corresponding to each phase of the three-phase line. The working mechanisms of each phase are exactly the same. Here we mainly introduce them. The specific structure of the single phase.

The three-position switch includes an isolated static contact 11, a rotating switch knife 8, and a grounding static contact 10 arranged on the cabinet body 14. The grounding static contact 10 is connected to the cabinet body 14 to maintain grounding, and the rotating switch knife 8 passes through the isolation insulator. 7 is supported and fixed on the cabinet body 14, and the rotating knife 8 has a grounding station connected to the grounding static contact 10, a conducting station connected to the isolated static contact 11, and a grounding station connected to the grounding static contact 10 during its rotation stroke. And the isolation station that isolates the static contacts 11 and disconnects simultaneously.

The two side walls of the cabinet body 14 are respectively provided with a busbar connector 13, and a busbar 12 is fixedly connected between the two busbar connectors 13, and the busbar 12 is arranged horizontally, and an isolated static contact 11 is fixedly arranged on the busbar; in other implementations In this example, the busbar connector can also be omitted, and the busbar is directly connected to the busbar of the electrical cabinet. The bus bar 12 is a plate structure, the plate surface of the bus bar 12 is perpendicular to the rotation axis of the rotary switch knife 8 , and the isolating static contact 11 is fixed on the plate surface of the bus bar 12 .

The busbar 12 includes two busbar monomers arranged side by side along the direction of the rotation axis of the rotary switch knife 8, there is a space between the two busbar monomers, and the isolation static contact 11 is clamped and fixed between the two busbar monomers to enhance The fixing strength of the isolating static contact 11 and the contact area between increasing the isolating static contact 11 and the bus bar; On the board surface: the isolated static contact 11 and the busbar monomer can be fixed by bolts or by rivets.

The rotating switch knife 8 includes two knife bodies arranged at intervals, and there is a space between the two knife bodies for accommodating the isolating static contact 11 and the grounding static contact 10 when the knife body rotates, and is respectively connected to the isolating static contact 11 and the grounding contact. The accommodating space where the static contact 10 contacts; in other embodiments, the rotating switch blade may only include one blade body. The two cutter bodies are in contact with the two sides of the isolating static contact 11 and the grounding static contact 10 respectively, which can increase the contact area and reduce the contact resistance. Apply force to prevent the grounding static contact 10 and the isolation static contact 11 from shifting to one side.

The three-position switch also includes an operating mechanism 1 arranged on the outside of the cabinet body 14 and a transmission mechanism arranged on the inside of the cabinet body 14 and connected with the rotary switch knife 8 . The operating mechanism 1 and the transmission mechanism realize dynamic sealing through the magnetic fluid seal 2 at the cabinet body 14. A shaft sleeve 15 is provided on one side of the magnetic fluid seal 2, and a hexagonal inner hole is provided in the shaft sleeve 15. The operating mechanism 1 has A hexagonal output shaft adapted to the shaft sleeve 15 , and the magnetic fluid seal 2 is in transmission connection with the operating mechanism 1 through the shaft sleeve 15 .

The transmission mechanism includes a transmission shaft 5 connected to the magnetic fluid seal 2, a crank arm 6 arranged on the transmission shaft 5, and an insulating pull rod 9 connecting the crank arm 6 and rotating the switch knife 8. The two ends of the insulating pull rod 9 are respectively connected to the The crank arm 6 and the rotary switch knife 8 are hinged. The two ends of the transmission shaft 5 are respectively assembled in the bearing 4 , the cabinet body 14 is provided with a bearing seat 3 , and the bearing 4 is arranged on the bearing seat 3 .

When the three-position switch structure for the electrical cabinet of the utility model is in use, the operating mechanism 1 drives the transmission shaft 5 to rotate through the magnetic fluid seal 2, and the transmission shaft 5 drives the insulating pull rod 9 to move through the crank arm 6, thereby driving the rotating switch blade 8 Turn to realize connection and disconnection with the grounding static contact 10 and the isolation static contact 11. Because the plate surface of the busbar 12 is perpendicular to the axis of rotation of the rotating switch knife 8, the structural strength of the busbar 12 is high, which ensures the overall strength of the busbar. The isolation static contact 11 deviates from the original position to ensure the normal operation of the three-position switch.

Embodiment 2 of the three-position switch structure for electrical cabinets of the present utility model differs from Embodiment 1 in that the busbar in Embodiment 1 includes two busbar monomers, and there is an interval between the two busbar monomers to isolate static contacts. The head is clamped and fixed between two busbar monomers. In this embodiment, the isolated static contact is fixed on the side walls of the two busbar monomers perpendicular to the board surface. There may be a gap between the two busbar monomers , and the interval can also be omitted.

Embodiment 3 of the three-position switch structure for electric cabinets of the present utility model differs from Embodiment 1 in that the bus bars are arranged horizontally in Embodiment 1. In this embodiment, the bus bars can also be arranged vertically, and the static contacts are fixed. on the busbar.

Claims (8)

1. The electrical cabinet uses a three-position switch structure, including a cabinet body and a three-position switch arranged on the cabinet body. The three-position switch includes an isolated static contact, a grounding static contact, and a rotating knife. The rotating knife is rotating In the stroke, there is a grounding station connected to the grounding static contact, a conduction station connected to the isolated static contact, and an isolated station disconnected from the grounding static contact and the isolated static contact at the same time. There is a busbar on the cabinet , the isolating static contact is arranged on the busbar, and the feature is that: the plate surface of the busbar is perpendicular to the rotation axis of the rotary switch knife. 2. The three-position switch structure for an electrical cabinet according to claim 1, wherein the busbar comprises two busbar monomers arranged side by side along the direction of the rotation axis of the rotating switch knife, and the isolated static contact is connected to the Two bus monomers are connected at the same time. 3. The three-position switch structure for an electrical cabinet according to claim 2, characterized in that there is an interval between the two bus bar units. 4. The three-position switch structure for electrical cabinets according to claim 3, characterized in that: the isolating static contact is arranged in the interval between two busbar monomers and clamped and fixed on the two busbar monomers between. 5. The three-position switch structure for electrical cabinets according to any one of claims 1-4, characterized in that: the rotary switch knife includes two knife bodies arranged at intervals, and there is a gap between the two knife bodies for The accommodating space for accommodating and contacting the isolated static contact when the cutter body rotates. 6. The three-position switch structure for an electrical cabinet according to any one of claims 1-4, characterized in that: the cabinet body is also provided with a busbar connector, and the two ends of the busbar are respectively fixedly connected to the busbar connector . 7. The three-position switch structure for an electrical cabinet according to any one of claims 1-4, characterized in that: the three-position switch also includes an operating mechanism arranged outside the cabinet and a rotating mechanism arranged inside the cabinet. The transmission mechanism connected with the switch knife, the operating mechanism and the transmission mechanism are connected through the magnetic fluid seal at the cabinet. 8. The three-position switch structure for an electrical cabinet according to claim 7, wherein the transmission mechanism includes a transmission shaft connected to the magnetic fluid seal, a crank arm and two ends arranged on the transmission shaft Insulated pull rods respectively hinged with the crank arm and the rotary switch knife.