Electric control opening and closing mechanism of vacuum load switch

Abstract

The utility model discloses an electric control opening and closing mechanism of a vacuum load switch, which adopts a mechanical hard linkage position feedback and hardware-level motor control scheme. The auxiliary switch is rigidly connected with the rotating shaft through the auxiliary connecting rod mechanism, when the rotating shaft rotates to an opening position, the auxiliary switch is driven to be switched to a first on-off state, and the normally-closed contact is forcibly disconnected; cutting off power supply of the driving motor; according to the utility model, a mechanical trigger circuit is adopted, the on-off state of the auxiliary switch is physically driven by the position of the rotating shaft, misjudgment of an electronic sensor in an extreme environment is thoroughly avoided, rigid transmission of an auxiliary connecting rod mechanism has no risk of aging of electronic components, and the auxiliary connecting rod mechanism is stable and reliable. The mechanical service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to an electric-controlled opening and closing mechanism of a vacuum load switch. Background Art

[0002] Traditional SF6 load switches generally use spring-loaded energy storage mechanisms, with their electronic control systems solely responsible for triggering the spring energy storage rather than directly actuating the contacts. Even in the few electronically controlled direct-drive solutions, drawbacks remain: open and closed position detection relies on external travel switches, which can easily distort signals; and complex transmission chains and delayed responses render outdoor intelligent switches less reliable. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide an electrically controlled opening and closing mechanism for a vacuum load switch.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an electrically controlled opening and closing mechanism of a vacuum load switch, comprising a shell, a plurality of sealed poles and an electrically controlled opening and closing mechanism, wherein a vacuum arc extinguishing chamber is provided in the sealed pole, and an insulating pull rod, a moving terminal and a static terminal are provided in the vacuum arc extinguishing chamber, the electrically controlled opening and closing mechanism is linked to each insulating pull rod through a rotating shaft and the rotating shaft is directly or indirectly started by a driving motor to synchronously control the contact or separation of all moving terminals and static terminals, the electrically controlled opening and closing mechanism also includes an auxiliary switch and an auxiliary connecting rod mechanism that links the rotating shaft and the auxiliary switch, the auxiliary switch is configured as follows: when the rotating shaft rotates to the opening position, the auxiliary connecting rod mechanism drives the auxiliary switch to switch to a first on-off state; when the rotating shaft rotates to the closing position, the auxiliary connecting rod mechanism drives the auxiliary switch to switch to a second on-off state; the start and stop of the driving motor are controlled by the on-off state of the auxiliary switch.

[0005] As an optimal technical solution of the present invention, the auxiliary connecting rod mechanism includes: a first auxiliary connecting rod, one end of which is fixedly connected to the rotating shaft; a second auxiliary connecting rod, one end of which is fixedly connected to the driving shaft of the auxiliary switch; and a linkage rod, both ends of which are respectively hinged to the free end of the first auxiliary connecting rod and the free end of the second auxiliary connecting rod.

[0006] As a preferred technical solution of the present invention, the rotating shaft is a polygonal column structure, and the first auxiliary connecting rod is provided with a polygonal shaft hole adapted to the rotating shaft.

[0007] As an optimal technical solution of the present invention, a buffer is provided in the shell and is located above the rotating shaft; the rotating shaft is fixedly connected to a buffer block, and the movement trajectory of the buffer block intersects with the buffer head of the buffer; when the opening action is completed, the buffer block abuts against the buffer head to absorb the inertial impact of the rotating shaft.

[0008] As a preferred technical solution of the present invention, the inner wall of the shell is fixedly connected to a mounting plate located above the rotating shaft, the buffer is fixed to the mounting plate, and its buffer head is located below the mounting plate.

[0009] As a preferred technical solution of the present invention, a traction plate is hingedly connected to the upper end of each insulating pull rod, and the other end of the traction plate is sleeved on the rotating shaft and fixed circumferentially relative to the rotating shaft.

[0010] To sum up, the beneficial effects of the present invention are as follows: a mechanical trigger circuit is adopted: the on-off state of the auxiliary switch is physically driven by the position of the rotating shaft, the auxiliary connecting rod mechanism moves with the rotating shaft, and then drives the driving shaft of the auxiliary switch to realize the switching of the two on-off states, completely avoiding the misjudgment of electronic sensors in extreme environments, and the rigid transmission of the auxiliary connecting rod mechanism has no risk of aging of electronic components, thereby improving the service life of the machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the structure of the load switch of the utility model;

[0012] Figure 2 This is a structural diagram of the electric control opening and closing mechanism in the utility model;

[0013] Figure 3 This is a schematic diagram of the structure of the rotating shaft and the insulating pull rod of the utility model;

[0014] Figure 4 yes Figure 1 Enlarged view of part A.

[0015] Figure numerals: 1. Shell; 2. Sealed pole; 3. Electric control opening and closing mechanism; 4. Insulating pull rod; 5. Drive motor; 6. Rotating shaft; 7. Auxiliary switch; 8. Auxiliary connecting rod mechanism; 9. First auxiliary connecting rod; 10. Second auxiliary connecting rod; 11. Drive shaft; 12. Linkage rod; 13. Buffer; 14. Buffer block; 15. Mounting plate; 16. Traction plate. DETAILED DESCRIPTION

[0016] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments and drawings. However, the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0017] The specific embodiments of the present utility model are described below with reference to the accompanying drawings.

[0018] like Figure 1-4The electrically controlled opening and closing mechanism of a vacuum load switch shown in the figure includes a shell 1, several sealed poles 2 and an electrically controlled opening and closing mechanism 3. A vacuum arc chamber is provided in the sealed pole 2, and an insulating pull rod 4, a moving terminal and a static terminal are provided in the vacuum arc chamber. The electrically controlled opening and closing mechanism 3 is linked to each insulating pull rod 4 through a rotating shaft 6, and the rotating shaft 6 is directly or indirectly started by a drive motor 5 (the difference between direct and indirect is that the direct action or the transmission is carried out by a connecting rod mechanism, which is not the focus of this application. This is the existing technology, so it is not elaborated in detail) to synchronously control the contact or separation of all moving terminals and static terminals. The electrically controlled opening and closing mechanism 3 also includes an auxiliary switch 7 and an auxiliary connecting rod mechanism 8 that links the rotating shaft 6 and the auxiliary switch 7. The auxiliary switch 7 is configured as follows: when the rotating shaft 6 rotates to the opening position, the auxiliary connecting rod mechanism 8 drives the auxiliary switch 7 to switch to a first on-off state; when the rotating shaft 6 rotates to the closing position, the auxiliary connecting rod mechanism 8 drives the auxiliary switch 7 to switch to a second on-off state; the start and stop of the drive motor 5 are controlled by the on-off state of the auxiliary switch 7.

[0019] In this embodiment, the auxiliary switch 7 utilizes a commercially available F10 series mechanical limit switch. Its internal contact switching mechanism is a mature, existing technology. In the mechanical-electrical linkage system of the pole-mounted vacuum load switch, the "first on-off state" and "second on-off state" of the auxiliary switch 7 are essentially hardware-level circuit switching signals triggered by mechanical position. The auxiliary switch 7 uses a normally closed (NC) contact as its primary control contact. When the rotating shaft 6 reaches the open position, the auxiliary linkage 8 switches the switch to the first on-off state (NC open). When the rotating shaft 6 reaches the closed position, the switch returns to the second on-off state (NC closed). This contact state change directly controls the power supply circuit for the drive motor 5, eliminating the need for an additional control module. It should be noted that the core innovation of this application lies in the mechanical linkage design between the auxiliary switch 7 and the rotating shaft 6 through the auxiliary linkage 8, and the hardware-level position triggering function achieved thereby. The specific circuitry for controlling the start and stop of the drive motor 5 after the auxiliary switch 7 contacts switch is a conventional design known to those skilled in the art and does not constitute a claimed technical improvement.

[0020] A mechanical trigger circuit is used: the on-off state of the auxiliary switch 7 is physically driven by the position of the rotating shaft 6, and the auxiliary connecting rod mechanism 8 moves with the rotating shaft 6, thereby driving the driving shaft 11 of the auxiliary switch 7 to achieve switching between the two on-off states, completely avoiding the misjudgment of electronic sensors in extreme environments. The rigid transmission of the auxiliary connecting rod mechanism 8 eliminates the risk of aging of electronic components and improves the service life of the machine.

[0021] The auxiliary link mechanism 8 includes: a first auxiliary link 9, one end of which is fixed to the rotating shaft 6; a second auxiliary link 10, one end of which is fixed to the driving shaft 11 of the auxiliary switch 7; and a linkage rod 12, both ends of which are hinged to the free ends of the first auxiliary link 9 and the second auxiliary link 10 respectively.

[0022] The rotating shaft 6 has a polygonal cylindrical structure (e.g., a hexagon), and the first auxiliary connecting rod 9 is provided with a polygonal axial hole adapted to the rotating shaft 6, achieving gapless circumferential fixation. It should be noted that the torque transmission structure between the rotating shaft 6 and the first auxiliary connecting rod 9 in this application is not limited to a polygonal fit. Any design that achieves rigid torque transmission through physical interlocking, including but not limited to: keyway fit (e.g., flat key, spline), threaded fastening (e.g., radial locking of anti-loosening screws), or interference fit, falls within the scope of equivalent alternatives of the technical solution of this application.

[0023] A buffer 13 is provided in the shell 1 and is located above the rotating shaft 6; the rotating shaft 6 is fixedly connected to a buffer block 14, and the movement trajectory of the buffer block 14 intersects with the buffer head of the buffer 13; when the opening action is completed, the buffer block 14 abuts against the buffer head to absorb the inertial impact of the rotating shaft 6. In this embodiment, the buffer 13 preferably adopts a hydraulic damper or a gas-liquid mixed buffer 13, etc.

[0024] A mounting plate 15 located above the rotating shaft 6 is fixedly connected to the inner wall of the housing 1 . The buffer 13 is fixed to the mounting plate 15 , and its buffer head is located below the mounting plate 15 .

[0025] A traction plate 16 is hingedly connected to the upper end of each insulating pull rod 4. The other end of the traction plate 16 is sleeved on the rotating shaft 6 and is circumferentially fixed relative to the rotating shaft 6. The circumferential fixing structure mentioned above between the rotating shaft 6 and the traction plate 16 can also be adopted.

[0026] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention as claimed, and the scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An electrically controlled opening and closing mechanism for a vacuum load switch, comprising a housing (1), a plurality of sealed poles (2), and an electrically controlled opening and closing mechanism (3), wherein a vacuum arc extinguishing chamber is provided in the sealed pole (2), and an insulating pull rod (4), a moving terminal, and a static terminal are provided in the vacuum arc extinguishing chamber, wherein the electrically controlled opening and closing mechanism (3) is linked to each insulating pull rod (4) via a rotating shaft (6), and the rotating shaft (6) is directly or indirectly started by a driving motor (5), so as to synchronously control the contact or separation of all the moving terminals and the static terminals, characterized in that: The electrically controlled opening and closing mechanism (3) further comprises an auxiliary switch (7) and an auxiliary link mechanism (8) linking the rotating shaft (6) and the auxiliary switch (7); the auxiliary switch (7) is configured such that: when the rotating shaft (6) rotates to the opening position, the auxiliary link mechanism (8) drives the auxiliary switch (7) to switch to a first on-off state; when the rotating shaft (6) rotates to the closing position, the auxiliary link mechanism (8) drives the auxiliary switch (7) to switch to a second on-off state; and the start and stop of the driving motor (5) is controlled by the on-off state of the auxiliary switch (7).

2. The electrically controlled opening and closing mechanism of the vacuum load switch according to claim 1, characterized in that: The auxiliary link mechanism (8) comprises: a first auxiliary link (9), one end of which is fixedly connected to the rotating shaft (6); a second auxiliary link (10), one end of which is fixedly connected to the driving shaft (11) of the auxiliary switch (7); and a linkage rod (12), two ends of which are respectively hinged to the free end of the first auxiliary link (9) and the free end of the second auxiliary link (10).

3. The electrically controlled opening and closing mechanism of the vacuum load switch according to claim 2, characterized in that: The rotating shaft (6) is a polygonal column structure, and the first auxiliary connecting rod (9) is provided with a polygonal shaft hole adapted to the rotating shaft (6).

4. The electrically controlled opening and closing mechanism of the vacuum load switch according to claim 1, characterized in that: A buffer (13) is provided in the housing (1) and is located above the rotating shaft (6); the rotating shaft (6) is fixedly connected to a buffer block (14), and the movement trajectory of the buffer block (14) intersects with the buffer head of the buffer (13); when the opening action is completed, the buffer block (14) abuts against the buffer head to absorb the inertial impact of the rotating shaft (6).

5. The electrically controlled opening and closing mechanism of the vacuum load switch according to claim 4, characterized in that: The inner wall of the housing (1) is fixedly connected to a mounting plate (15) located above the rotating shaft (6); the buffer (13) is fixed to the mounting plate (15), and its buffer head is located below the mounting plate (15).

6. The electrically controlled opening and closing mechanism of the vacuum load switch according to claim 1, characterized in that: A traction plate (16) is hingedly connected to the upper end of each insulating pull rod (4), and the other end of the traction plate (16) is sleeved on the rotating shaft (6) and circumferentially fixed relative to the rotating shaft (6).

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