Special closing latch with pressure sensor for circuit breaker

Abstract

A special closing latch with a pressure sensor for a circuit breaker comprises a tripping mechanism, a rotating block, a moving block, a single chip microcomputer, a thin film pressure sensor, a pressure-bearing surface, a spring and a springback mechanism, according to the utility model, the thin film pressure sensor is arranged, when the moving block is in a pressed state, the single-chip microcomputer acquires and conditions differential signals (millivolt-level signals) of the thin film pressure sensor, converts analog quantity of the thin film pressure sensor into visual digital signals, and displays the digital signals, so that the pressure of the moving block is known in real time; the elastic potential energy of the spring can be fed back; therefore, the monitoring mode does not need to monitor after the mechanism acts, and whether the spring is in a normal working state or not can be monitored even if the circuit breaker is in an electrified operation state or a hot standby state.

Description

Technical Field

[0001] The utility model relates to the technical field of closing latches, in particular to a special closing latch for a circuit breaker with a pressure sensor. Background Art

[0002] The opening and closing processes of high-voltage circuit breakers require a relatively high level of force from the operating mechanism. Therefore, most circuit breaker mechanisms employ a combined energy storage and release mechanism. To close the circuit, the closing spring is first stretched, either electrically or manually, to create elastic potential energy within the operating mechanism. This energy is then captured by the release mechanism, maintaining the potential energy. During the closing process, the operator presses the appropriate button (or, when the coil is energized, pushes the button), applying minimal force to disengage the release mechanism's latching elements. This instantly releases the mechanism's substantial potential energy, closing the circuit breaker. The closing process also stretches the opening spring, storing energy in preparation for the opening action. This energy is also captured by the release mechanism's release mechanism. To open the circuit, similar to closing, a minimal force is applied to disengage the release mechanism's latching elements. (The difference between opening and closing is that there is no energy storage; closing is a similar energy storage operation to opening.)

[0003] However, after long-term use, conventional circuit breakers experience fatigue in the springs, weakening the spring force they generate. This weakens the spring force generated by the springs, causing the closing latch to release its elastic potential energy and prevent the circuit breaker from closing. Even after closing, the circuit breaker cannot remain closed, and even a slight shake can cause the circuit breaker to open, causing the circuit breaker to malfunction. To address this issue, existing products include online monitoring of the circuit breaker mechanism, but most use angle sensors or linear sensors to monitor the mechanism's movement. However, this monitoring method suffers from the disadvantage that it can only monitor after the mechanism has actuated. If the circuit breaker is operating under power or in hot standby mode, closing and opening operations are not permitted. Therefore, a power outage is required to operate the circuit breaker to monitor data and determine whether the spring is operating normally. This method is also quite cumbersome. Utility Model Content

[0004] The purpose of the present utility model is to provide a circuit breaker-specific closing latch with a pressure sensor, so as to solve the problems mentioned in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides a special closing latch for a circuit breaker with a pressure sensor, comprising a rotating block fixed to the output shaft of a tripping mechanism, a moving block slidably connected to the rotating block, and a thin film pressure sensor installed at the end of the rotating block and connected to a single-chip microcomputer, one end of the moving block being a pressure-bearing surface for limiting the release of elastic potential energy of a spring; when the moving block is under pressure, one end surface of the moving block squeezes the thin film pressure sensor; the rotating block is also provided with a rebound mechanism for resetting the moving block.

[0006] Furthermore, the pressure-bearing surface is an arc-shaped surface, and the axis of the arc-shaped surface coincides with the axis of the output shaft.

[0007] Furthermore, the moving block includes a sliding portion and an extrusion portion, the pressure-bearing surface is located in the extrusion portion, and the extrusion portion is detachably connected to the sliding portion.

[0008] Furthermore, the sliding part includes an extrusion block and a sliding block, the extrusion block is provided with a countersunk hole, the end of the extrusion part away from the pressure-bearing surface is provided with a threaded hole, the bolt passes through the countersunk hole and is threadedly connected to the threaded hole, the nut of the bolt is located inside the countersunk hole, and the end face of the extrusion block away from the extrusion part is used to extrude the thin film pressure sensor.

[0009] Furthermore, a rubber block is fixedly connected to the extrusion block, and the rubber block is used to squeeze the thin film pressure sensor.

[0010] Furthermore, the sliding part is provided with a dovetail groove, and the rotating block is provided with a convex strip that fits with the dovetail groove. The end of the sliding part facing away from the extrusion part is fixedly connected to a limiting plate. When the extrusion part is not under pressure, the limiting plate abuts against the end of the convex strip.

[0011] Furthermore, the limiting plate is an L-shaped plate, and the L-shaped plate wraps one end of the sliding part in a wrapping shape.

[0012] Furthermore, a notch is provided on the rotating block, the sliding block is located on the notch, the rebound mechanism includes a spring plate located between the limiting plate and the side wall of the notch, the fixed end of the spring plate is fixed to the side wall of the notch by a locking screw, and the movable end of the spring plate abuts against the limiting plate.

[0013] Furthermore, a placement groove is provided on the rotating block, and the tail of the thin film pressure sensor is located in the placement groove. A through hole connected to the placement groove is provided on the rotating block, and the through hole is perpendicular to the placement groove. The transmission line connected to the tail of the thin film pressure sensor passes through the through hole and is connected to the single-chip microcomputer.

[0014] Furthermore, a protective plate is fixedly connected to the end surface of the rotating block provided with the placement groove.

[0015] Furthermore, the rotating block is provided with a plurality of straight slots.

[0016] The beneficial effects of the utility model are as follows: the utility model is provided with a thin film pressure sensor. When the moving block is in a pressurized state, the single chip microcomputer collects and conditions the differential signal (millivolt-level signal) of the thin film pressure sensor, converts the analog quantity of the thin film pressure sensor into a visual digital signal, and displays it, so as to understand the pressure of the moving block in real time, and further can feedback the elastic potential energy of the spring; therefore, this monitoring method does not need to be monitored after the mechanism is actuated, and can realize that whether the spring is in a normal working state can be monitored even when the circuit breaker is energized or in a hot standby state. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is another perspective of the present invention and a schematic diagram of the structure after the protective plate explodes;

[0020] Figure 3 It is an exploded schematic diagram of the overall structure of the utility model.

[0021] In the figure: 1. Extrusion block; 2. Sliding block; 3. Sliding part; 4. Limiting plate; 5. Rotating block; 6. Extrusion part; 7. Moving block; 8. Rubber block; 9. Straight slot; 10. Transmission line; 11. Through hole; 12. Notch; 13. Output shaft; 14. Thin film pressure sensor; 15. Protective plate; 16. Shrapnel; 17. Placement slot; 18. Bolt; 19. Dovetail groove. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0023] In one embodiment, Figure 1-3As shown, a circuit breaker special closing latch with a pressure sensor includes a rotating block 5 fixed to the output shaft 13 of the tripping mechanism, a moving block 7 slidably connected to the rotating block 5, and a film pressure sensor 14 installed at the end of the rotating block 5 and connected to the single-chip microcomputer. One end of the moving block 7 is a pressure-bearing surface for limiting the release of elastic potential energy of the spring; when the moving block 7 is pressurized, one end surface of the moving block 7 squeezes the film pressure sensor 14; the rotating block 5 is also provided with a rebound mechanism for resetting the moving block 7; therefore, before the circuit breaker is closed, that is, when the tripping mechanism is not activated, the moving block 7 will be in a pressurized state. At this time, one end surface of the moving block 7 squeezes the film pressure sensor 14, and the single-chip microcomputer will The differential signal (millivolt-level signal) of the film pressure sensor 14 is collected and conditioned, and the analog quantity of the film pressure sensor 14 is converted into a visible digital signal for display, thereby obtaining real-time information on the pressure of the movable block 7, and further calculating the elastic potential energy of the spring, and further observing in real time whether the spring is fatigued. Therefore, this monitoring method does not require monitoring after the mechanism is actuated, thereby enabling monitoring of whether the spring is in normal working condition even when the circuit breaker is energized or in hot standby mode. Moreover, by displaying the data, the magnitude and changes of the pressure on the movable block 7 can be understood in real time, thereby understanding the online operating status of the circuit breaker.

[0024] In this embodiment, the pressure-bearing surface is an arc-shaped surface, and the axis of the arc-shaped surface coincides with the axis of the output shaft 13; this facilitates the disengagement of the latch; the moving block 7 includes a sliding portion 3 and an extrusion portion 6, the pressure-bearing surface is located in the extrusion portion 6, and the extrusion portion 6 is detachably connected to the sliding portion 3. When the extrusion portion 6 is severely worn, the extrusion portion 6 can be directly replaced to prevent the need to replace the entire moving block 7, thereby saving costs; wherein, the detachable connection method is as follows: the sliding portion 3 includes an extrusion block 1 and a sliding block 2, the extrusion block 1 is provided with a countersunk hole, and the end of the extrusion portion 6 facing away from the pressure-bearing surface is provided with a threaded hole, the bolt 18 passes through the countersunk hole and is threadedly connected to the threaded hole, and the end surface of the extrusion block 1 facing away from the extrusion portion 6 is used to extrude the thin film pressure sensor 14, thereby realizing the detachable connection between the extrusion portion 6 and the sliding portion 3; and the nut of the bolt 18 is located inside the countersunk hole to prevent the nut from extruding the thin film pressure sensor 14, and a rubber block 8 is fixed to the extrusion block 1, and the rubber block 8 is used to extrude the thin film pressure sensor 14, thereby ensuring uniform extrusion of the film pressure sensor 14, avoiding the occurrence of extrusion blind spots at the countersunk holes, and ensuring the pressure collection accuracy of the film pressure sensor 14. In addition, the rubber block 8 is made of rubber material with small deformation, such as high-strength POM material; and a dovetail groove 19 is provided on the sliding part 3, and a convex strip is provided on the rotating block 5 that is gap-matched with the dovetail groove 19, thereby realizing the sliding connection between the rotating block 5 and the moving block 7, and the end of the sliding part 3 away from the extrusion part 6 is fixedly connected to the limit plate 4. When the extrusion part 6 is not under pressure, the limit plate 4 abuts against the end of the convex strip to prevent the moving block 7 from running out of the rotating block 5; the design of the dovetail groove 19 improves the connection strength between the rotating block 5 and the moving block 7. In addition, the limit plate 4 is an L-shaped plate, which wraps one end of the sliding part 3 in a wrapped shape, ensuring the compactness of the latch structure and having a certain aesthetic feeling. The limit plate 4 is fixed to the moving block 7 by screw connection, which facilitates the assembly and disassembly of the latch in this utility model.

[0025] In this embodiment, a notch 12 is provided on the rotating block 5, and the sliding block 2 is located on the notch 12. The rebound mechanism includes a spring piece 16 located between the limit plate 4 and the side wall of the notch 12. The fixed end of the spring piece 16 is fixed to the side wall of the notch 12 by a locking screw, and the movable end of the spring piece 16 abuts against the limit plate 4. Therefore, when the pressure-bearing surface is compressed, the spring piece 16 is deformed. When the tripping mechanism is activated, the latch rotates, and the elastic potential energy of the spring is released, the spring piece 16 is reset, and the limit plate 4 will abut against the end of the convex strip. At this time, the rubber block 8 is removed from the film pressure sensor 14; the pressure monitored by the film pressure sensor 14 is zero; in addition, a placement groove 17 is provided on the rotating block 5, and the tail of the film pressure sensor 14 is located in the placement groove 17 In the figure, a through hole 11 is provided on the rotating block 5, which is connected to the placement groove 17. The through hole 11 is perpendicular to the placement groove 17. The transmission line 10 connected to the tail of the film pressure sensor 14 passes through the through hole 11 and is connected to the single-chip microcomputer, making the overall structure of the latch more compact; and the end face of the rotating block 5 with the placement groove 17 is fixed with a protective plate 15, which protects the film pressure sensor 14; and a number of straight notches 9 are also provided on the rotating block 5, which reduce the weight of the latch while ensuring the strength of the rotating block 5; in addition, the distance between the rubber block 8 and the film pressure sensor 14 is less than half of the distance from the limit plate 4 to the side wall of the notch 12, thereby preventing the risk of excessive deformation of the spring piece 16 and ensuring the service life of the spring piece 16.

[0026] Working principle: Before the circuit breaker is closed, that is, when the tripping mechanism is not yet activated, the moving block 7 will be in a pressurized state. At this time, the rubber block 8 squeezes the film pressure sensor 14, and the single-chip microcomputer collects and conditions the differential signal (millivolt signal) of the film pressure sensor 14, and converts the analog quantity of the film pressure sensor 14 into a visual digital signal for display, so as to understand the pressure exerted on the moving block 7 in real time, and then further calculate the elastic potential energy of the spring, so as to observe in real time whether the spring is fatigued; therefore, this monitoring method does not require monitoring after the mechanism is actuated, so that the circuit breaker can monitor whether the spring is in normal working condition even when it is energized or in hot standby state; therefore, the utility model can understand the size and change of the pressure exerted on the moving block 7 in real time by displaying data, so as to understand the online operation status of the circuit breaker.

[0027] The above disclosure is merely one or more preferred embodiments of the present application and is not intended to limit the scope of the present application. A person skilled in the art will understand that all or part of the processes of the above embodiments and equivalent changes made in accordance with the claims of the present application are still within the scope of the present application.

Claims

1. A circuit breaker closing latch with a pressure sensor, characterized in that: The invention comprises a rotating block (5) fixedly connected to an output shaft (13) of a tripping mechanism, a moving block (7) slidably connected to the rotating block (5), and a thin film pressure sensor (14) mounted on the end of the rotating block (5) and connected to a single chip computer, wherein one end of the moving block (7) is a pressure-bearing surface for limiting the release of elastic potential energy of a spring; when the moving block (7) is under pressure, one end surface of the moving block (7) presses the thin film pressure sensor (14); and the rotating block (5) is also provided with a rebound mechanism for resetting the moving block (7).

2. The circuit breaker-specific closing latch with a pressure sensor according to claim 1, characterized in that: The pressure-bearing surface is an arc-shaped surface, and the axis of the arc-shaped surface coincides with the axis of the output shaft (13).

3. The circuit breaker-specific closing latch with a pressure sensor according to claim 1, characterized in that: The moving block (7) comprises a sliding part (3) and an extruding part (6); the pressure-bearing surface is located in the extruding part (6); and the extruding part (6) is detachably connected to the sliding part (3).

4. The circuit breaker-specific closing latch with a pressure sensor according to claim 3, characterized in that: The sliding part (3) comprises an extrusion block (1) and a sliding block (2), the extrusion block (1) being provided with a countersunk hole, the end of the extrusion part (6) facing away from the pressure-bearing surface being provided with a threaded hole, the bolt (18) passing through the countersunk hole and being threadedly connected with the threaded hole, the nut of the bolt (18) being located inside the countersunk hole, and the end surface of the extrusion block (1) facing away from the extrusion part (6) being used for extruding the thin film pressure sensor (14).

5. The circuit breaker-specific closing latch with a pressure sensor according to claim 4, characterized in that: A rubber block (8) for squeezing the thin film pressure sensor (14) is fixedly connected to the squeezing block (1).

6. The circuit breaker-specific closing latch with a pressure sensor according to claim 4, characterized in that: The sliding part (3) is provided with a dovetail groove (19), the rotating block (5) is provided with a convex strip which is loosely matched with the dovetail groove (19), and one end of the sliding part (3) which is away from the extrusion part (6) is fixedly connected to a limit plate (4), and when the extrusion part (6) is not under pressure, the limit plate (4) abuts against the end of the convex strip.

7. The circuit breaker-specific closing latch with a pressure sensor according to claim 6, characterized in that: The rotating block (5) is provided with a notch (12), the sliding block (2) is located on the notch (12), the rebound mechanism comprises a spring sheet (16) located between the limiting plate (4) and the side wall of the notch (12), the fixed end of the spring sheet (16) is fixedly connected to the side wall of the notch (12) by a locking screw, and the movable end of the spring sheet (16) is in contact with the limiting plate (4).

8. The circuit breaker-specific closing latch with a pressure sensor according to claim 1, characterized in that: The rotating block (5) is provided with a placement groove (17), the tail of the thin film pressure sensor (14) is located in the placement groove (17), the rotating block (5) is provided with a through hole (11) connected to the placement groove (17), the through hole (11) is perpendicular to the placement groove (17), and the transmission line (10) connected to the tail of the thin film pressure sensor (14) passes through the through hole (11) and is connected to the single chip computer.

9. The circuit breaker-specific closing latch with a pressure sensor according to claim 8, characterized in that: The end surface of the rotating block (5) provided with the placement groove (17) is fixedly connected with a protective plate (15).

10. The circuit breaker-specific closing latch with a pressure sensor according to claim 1, characterized in that: The rotating block (5) is also provided with a plurality of straight notches (9).

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